A file recording the current state of the device in the array
which can be a comma separated list of
faulty - device has been kicked from active use due to
- a detected fault
+ a detected fault or it has unacknowledged bad
+ blocks
in_sync - device is a fully in-sync member of the array
writemostly - device will only be subject to read
requests if there are no other options.
This applies only to raid1 arrays.
- blocked - device has failed, metadata is "external",
- and the failure hasn't been acknowledged yet.
+ blocked - device has failed, and the failure hasn't been
+ acknowledged yet by the metadata handler.
Writes that would write to this device if
it were not faulty are blocked.
spare - device is working, but not a full member.
This includes spares that are in the process
of being recovered to
+ write_error - device has ever seen a write error.
This list may grow in future.
This can be written to.
Writing "faulty" simulates a failure on the device.
Writing "writemostly" sets the writemostly flag.
Writing "-writemostly" clears the writemostly flag.
Writing "blocked" sets the "blocked" flag.
- Writing "-blocked" clears the "blocked" flag and allows writes
- to complete.
+ Writing "-blocked" clears the "blocked" flags and allows writes
+ to complete and possibly simulates an error.
Writing "in_sync" sets the in_sync flag.
+ Writing "write_error" sets writeerrorseen flag.
+ Writing "-write_error" clears writeerrorseen flag.
This file responds to select/poll. Any change to 'faulty'
or 'blocked' causes an event.
written, it will be rejected.
recovery_start
-
When the device is not 'in_sync', this records the number of
sectors from the start of the device which are known to be
correct. This is normally zero, but during a recovery
Setting this to 'none' is equivalent to setting 'in_sync'.
Setting to any other value also clears the 'in_sync' flag.
+ bad_blocks
+ This gives the list of all known bad blocks in the form of
+ start address and length (in sectors respectively). If output
+ is too big to fit in a page, it will be truncated. Writing
+ "sector length" to this file adds new acknowledged (i.e.
+ recorded to disk safely) bad blocks.
+
+ unacknowledged_bad_blocks
+ This gives the list of known-but-not-yet-saved-to-disk bad
+ blocks in the same form of 'bad_blocks'. If output is too big
+ to fit in a page, it will be truncated. Writing to this file
+ adds bad blocks without acknowledging them. This is largely
+ for testing.
+
An active md device will also contain and entry for each active device
#include "md.h"
#include "bitmap.h"
-#include <linux/dm-dirty-log.h>
/* debug macros */
#define DEBUG 0
* 0 or page 1
*/
static inline struct page *filemap_get_page(struct bitmap *bitmap,
- unsigned long chunk)
+ unsigned long chunk)
{
- if (bitmap->filemap == NULL)
- return NULL;
if (file_page_index(bitmap, chunk) >= bitmap->file_pages)
return NULL;
return bitmap->filemap[file_page_index(bitmap, chunk)
static inline void set_page_attr(struct bitmap *bitmap, struct page *page,
enum bitmap_page_attr attr)
{
- if (page)
- __set_bit((page->index<<2) + attr, bitmap->filemap_attr);
- else
- __set_bit(attr, &bitmap->logattrs);
+ __set_bit((page->index<<2) + attr, bitmap->filemap_attr);
}
static inline void clear_page_attr(struct bitmap *bitmap, struct page *page,
enum bitmap_page_attr attr)
{
- if (page)
- __clear_bit((page->index<<2) + attr, bitmap->filemap_attr);
- else
- __clear_bit(attr, &bitmap->logattrs);
+ __clear_bit((page->index<<2) + attr, bitmap->filemap_attr);
}
static inline unsigned long test_page_attr(struct bitmap *bitmap, struct page *page,
enum bitmap_page_attr attr)
{
- if (page)
- return test_bit((page->index<<2) + attr, bitmap->filemap_attr);
- else
- return test_bit(attr, &bitmap->logattrs);
+ return test_bit((page->index<<2) + attr, bitmap->filemap_attr);
}
/*
static void bitmap_file_set_bit(struct bitmap *bitmap, sector_t block)
{
unsigned long bit;
- struct page *page = NULL;
+ struct page *page;
void *kaddr;
unsigned long chunk = block >> CHUNK_BLOCK_SHIFT(bitmap);
- if (!bitmap->filemap) {
- struct dm_dirty_log *log = bitmap->mddev->bitmap_info.log;
- if (log)
- log->type->mark_region(log, chunk);
- } else {
+ if (!bitmap->filemap)
+ return;
- page = filemap_get_page(bitmap, chunk);
- if (!page)
- return;
- bit = file_page_offset(bitmap, chunk);
+ page = filemap_get_page(bitmap, chunk);
+ if (!page)
+ return;
+ bit = file_page_offset(bitmap, chunk);
- /* set the bit */
- kaddr = kmap_atomic(page, KM_USER0);
- if (bitmap->flags & BITMAP_HOSTENDIAN)
- set_bit(bit, kaddr);
- else
- __test_and_set_bit_le(bit, kaddr);
- kunmap_atomic(kaddr, KM_USER0);
- PRINTK("set file bit %lu page %lu\n", bit, page->index);
- }
+ /* set the bit */
+ kaddr = kmap_atomic(page, KM_USER0);
+ if (bitmap->flags & BITMAP_HOSTENDIAN)
+ set_bit(bit, kaddr);
+ else
+ __set_bit_le(bit, kaddr);
+ kunmap_atomic(kaddr, KM_USER0);
+ PRINTK("set file bit %lu page %lu\n", bit, page->index);
/* record page number so it gets flushed to disk when unplug occurs */
set_page_attr(bitmap, page, BITMAP_PAGE_DIRTY);
}
if (!bitmap)
return;
- if (!bitmap->filemap) {
- /* Must be using a dirty_log */
- struct dm_dirty_log *log = bitmap->mddev->bitmap_info.log;
- dirty = test_and_clear_bit(BITMAP_PAGE_DIRTY, &bitmap->logattrs);
- need_write = test_and_clear_bit(BITMAP_PAGE_NEEDWRITE, &bitmap->logattrs);
- if (dirty || need_write)
- if (log->type->flush(log))
- bitmap->flags |= BITMAP_WRITE_ERROR;
- goto out;
- }
/* look at each page to see if there are any set bits that need to be
* flushed out to disk */
else
md_super_wait(bitmap->mddev);
}
-out:
if (bitmap->flags & BITMAP_WRITE_ERROR)
bitmap_file_kick(bitmap);
}
struct page *page = NULL, *lastpage = NULL;
sector_t blocks;
void *paddr;
- struct dm_dirty_log *log = mddev->bitmap_info.log;
/* Use a mutex to guard daemon_work against
* bitmap_destroy.
spin_lock_irqsave(&bitmap->lock, flags);
for (j = 0; j < bitmap->chunks; j++) {
bitmap_counter_t *bmc;
- if (!bitmap->filemap) {
- if (!log)
- /* error or shutdown */
- break;
- } else
- page = filemap_get_page(bitmap, j);
+ if (!bitmap->filemap)
+ /* error or shutdown */
+ break;
+
+ page = filemap_get_page(bitmap, j);
if (page != lastpage) {
/* skip this page unless it's marked as needing cleaning */
-1);
/* clear the bit */
- if (page) {
- paddr = kmap_atomic(page, KM_USER0);
- if (bitmap->flags & BITMAP_HOSTENDIAN)
- clear_bit(file_page_offset(bitmap, j),
- paddr);
- else
- __test_and_clear_bit_le(file_page_offset(bitmap, j),
- paddr);
- kunmap_atomic(paddr, KM_USER0);
- } else
- log->type->clear_region(log, j);
+ paddr = kmap_atomic(page, KM_USER0);
+ if (bitmap->flags & BITMAP_HOSTENDIAN)
+ clear_bit(file_page_offset(bitmap, j),
+ paddr);
+ else
+ __clear_bit_le(
+ file_page_offset(bitmap,
+ j),
+ paddr);
+ kunmap_atomic(paddr, KM_USER0);
}
} else
j |= PAGE_COUNTER_MASK;
spin_unlock_irqrestore(&bitmap->lock, flags);
/* now sync the final page */
- if (lastpage != NULL || log != NULL) {
+ if (lastpage != NULL) {
spin_lock_irqsave(&bitmap->lock, flags);
if (test_page_attr(bitmap, lastpage, BITMAP_PAGE_NEEDWRITE)) {
clear_page_attr(bitmap, lastpage, BITMAP_PAGE_NEEDWRITE);
spin_unlock_irqrestore(&bitmap->lock, flags);
- if (lastpage)
- write_page(bitmap, lastpage, 0);
- else
- if (log->type->flush(log))
- bitmap->flags |= BITMAP_WRITE_ERROR;
+ write_page(bitmap, lastpage, 0);
} else {
set_page_attr(bitmap, lastpage, BITMAP_PAGE_NEEDWRITE);
spin_unlock_irqrestore(&bitmap->lock, flags);
BUILD_BUG_ON(sizeof(bitmap_super_t) != 256);
if (!file
- && !mddev->bitmap_info.offset
- && !mddev->bitmap_info.log) /* bitmap disabled, nothing to do */
+ && !mddev->bitmap_info.offset) /* bitmap disabled, nothing to do */
return 0;
BUG_ON(file && mddev->bitmap_info.offset);
- BUG_ON(mddev->bitmap_info.offset && mddev->bitmap_info.log);
bitmap = kzalloc(sizeof(*bitmap), GFP_KERNEL);
if (!bitmap)
int bitmap_load(mddev_t *mddev)
{
int err = 0;
+ sector_t start = 0;
sector_t sector = 0;
struct bitmap *bitmap = mddev->bitmap;
}
bitmap_close_sync(bitmap);
- if (mddev->bitmap_info.log) {
- unsigned long i;
- struct dm_dirty_log *log = mddev->bitmap_info.log;
- for (i = 0; i < bitmap->chunks; i++)
- if (!log->type->in_sync(log, i, 1))
- bitmap_set_memory_bits(bitmap,
- (sector_t)i << CHUNK_BLOCK_SHIFT(bitmap),
- 1);
- } else {
- sector_t start = 0;
- if (mddev->degraded == 0
- || bitmap->events_cleared == mddev->events)
- /* no need to keep dirty bits to optimise a
- * re-add of a missing device */
- start = mddev->recovery_cp;
-
- err = bitmap_init_from_disk(bitmap, start);
- }
+ if (mddev->degraded == 0
+ || bitmap->events_cleared == mddev->events)
+ /* no need to keep dirty bits to optimise a
+ * re-add of a missing device */
+ start = mddev->recovery_cp;
+
+ err = bitmap_init_from_disk(bitmap, start);
+
if (err)
goto out;
unsigned long file_pages; /* number of pages in the file */
int last_page_size; /* bytes in the last page */
- unsigned long logattrs; /* used when filemap_attr doesn't exist
- * because we are working with a dirty_log
- */
-
unsigned long flags;
int allclean;
wait_queue_head_t behind_wait;
struct sysfs_dirent *sysfs_can_clear;
-
};
/* the bitmap API */
}
EXPORT_SYMBOL_GPL(bio_clone_mddev);
+void md_trim_bio(struct bio *bio, int offset, int size)
+{
+ /* 'bio' is a cloned bio which we need to trim to match
+ * the given offset and size.
+ * This requires adjusting bi_sector, bi_size, and bi_io_vec
+ */
+ int i;
+ struct bio_vec *bvec;
+ int sofar = 0;
+
+ size <<= 9;
+ if (offset == 0 && size == bio->bi_size)
+ return;
+
+ bio->bi_sector += offset;
+ bio->bi_size = size;
+ offset <<= 9;
+ clear_bit(BIO_SEG_VALID, &bio->bi_flags);
+
+ while (bio->bi_idx < bio->bi_vcnt &&
+ bio->bi_io_vec[bio->bi_idx].bv_len <= offset) {
+ /* remove this whole bio_vec */
+ offset -= bio->bi_io_vec[bio->bi_idx].bv_len;
+ bio->bi_idx++;
+ }
+ if (bio->bi_idx < bio->bi_vcnt) {
+ bio->bi_io_vec[bio->bi_idx].bv_offset += offset;
+ bio->bi_io_vec[bio->bi_idx].bv_len -= offset;
+ }
+ /* avoid any complications with bi_idx being non-zero*/
+ if (bio->bi_idx) {
+ memmove(bio->bi_io_vec, bio->bi_io_vec+bio->bi_idx,
+ (bio->bi_vcnt - bio->bi_idx) * sizeof(struct bio_vec));
+ bio->bi_vcnt -= bio->bi_idx;
+ bio->bi_idx = 0;
+ }
+ /* Make sure vcnt and last bv are not too big */
+ bio_for_each_segment(bvec, bio, i) {
+ if (sofar + bvec->bv_len > size)
+ bvec->bv_len = size - sofar;
+ if (bvec->bv_len == 0) {
+ bio->bi_vcnt = i;
+ break;
+ }
+ sofar += bvec->bv_len;
+ }
+}
+EXPORT_SYMBOL_GPL(md_trim_bio);
+
/*
* We have a system wide 'event count' that is incremented
* on any 'interesting' event, and readers of /proc/mdstat
rdev->sb_start = 0;
rdev->sectors = 0;
}
+ if (rdev->bb_page) {
+ put_page(rdev->bb_page);
+ rdev->bb_page = NULL;
+ }
}
ret = -EINVAL;
bdevname(rdev->bdev, b);
- sb = (mdp_super_t*)page_address(rdev->sb_page);
+ sb = page_address(rdev->sb_page);
if (sb->md_magic != MD_SB_MAGIC) {
printk(KERN_ERR "md: invalid raid superblock magic on %s\n",
rdev->preferred_minor = sb->md_minor;
rdev->data_offset = 0;
rdev->sb_size = MD_SB_BYTES;
+ rdev->badblocks.shift = -1;
if (sb->level == LEVEL_MULTIPATH)
rdev->desc_nr = -1;
ret = 1;
} else {
__u64 ev1, ev2;
- mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page);
+ mdp_super_t *refsb = page_address(refdev->sb_page);
if (!uuid_equal(refsb, sb)) {
printk(KERN_WARNING "md: %s has different UUID to %s\n",
b, bdevname(refdev->bdev,b2));
static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev)
{
mdp_disk_t *desc;
- mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page);
+ mdp_super_t *sb = page_address(rdev->sb_page);
__u64 ev1 = md_event(sb);
rdev->raid_disk = -1;
rdev->sb_size = MD_SB_BYTES;
- sb = (mdp_super_t*)page_address(rdev->sb_page);
+ sb = page_address(rdev->sb_page);
memset(sb, 0, sizeof(*sb));
return cpu_to_le32(csum);
}
+static int md_set_badblocks(struct badblocks *bb, sector_t s, int sectors,
+ int acknowledged);
static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
{
struct mdp_superblock_1 *sb;
if (ret) return ret;
- sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
+ sb = page_address(rdev->sb_page);
if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
sb->major_version != cpu_to_le32(1) ||
else
rdev->desc_nr = le32_to_cpu(sb->dev_number);
+ if (!rdev->bb_page) {
+ rdev->bb_page = alloc_page(GFP_KERNEL);
+ if (!rdev->bb_page)
+ return -ENOMEM;
+ }
+ if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BAD_BLOCKS) &&
+ rdev->badblocks.count == 0) {
+ /* need to load the bad block list.
+ * Currently we limit it to one page.
+ */
+ s32 offset;
+ sector_t bb_sector;
+ u64 *bbp;
+ int i;
+ int sectors = le16_to_cpu(sb->bblog_size);
+ if (sectors > (PAGE_SIZE / 512))
+ return -EINVAL;
+ offset = le32_to_cpu(sb->bblog_offset);
+ if (offset == 0)
+ return -EINVAL;
+ bb_sector = (long long)offset;
+ if (!sync_page_io(rdev, bb_sector, sectors << 9,
+ rdev->bb_page, READ, true))
+ return -EIO;
+ bbp = (u64 *)page_address(rdev->bb_page);
+ rdev->badblocks.shift = sb->bblog_shift;
+ for (i = 0 ; i < (sectors << (9-3)) ; i++, bbp++) {
+ u64 bb = le64_to_cpu(*bbp);
+ int count = bb & (0x3ff);
+ u64 sector = bb >> 10;
+ sector <<= sb->bblog_shift;
+ count <<= sb->bblog_shift;
+ if (bb + 1 == 0)
+ break;
+ if (md_set_badblocks(&rdev->badblocks,
+ sector, count, 1) == 0)
+ return -EINVAL;
+ }
+ } else if (sb->bblog_offset == 0)
+ rdev->badblocks.shift = -1;
+
if (!refdev) {
ret = 1;
} else {
__u64 ev1, ev2;
- struct mdp_superblock_1 *refsb =
- (struct mdp_superblock_1*)page_address(refdev->sb_page);
+ struct mdp_superblock_1 *refsb = page_address(refdev->sb_page);
if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
sb->level != refsb->level ||
static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev)
{
- struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
+ struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
__u64 ev1 = le64_to_cpu(sb->events);
rdev->raid_disk = -1;
int max_dev, i;
/* make rdev->sb match mddev and rdev data. */
- sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
+ sb = page_address(rdev->sb_page);
sb->feature_map = 0;
sb->pad0 = 0;
sb->recovery_offset = cpu_to_le64(0);
memset(sb->pad1, 0, sizeof(sb->pad1));
- memset(sb->pad2, 0, sizeof(sb->pad2));
memset(sb->pad3, 0, sizeof(sb->pad3));
sb->utime = cpu_to_le64((__u64)mddev->utime);
sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors);
}
+ if (rdev->badblocks.count == 0)
+ /* Nothing to do for bad blocks*/ ;
+ else if (sb->bblog_offset == 0)
+ /* Cannot record bad blocks on this device */
+ md_error(mddev, rdev);
+ else {
+ struct badblocks *bb = &rdev->badblocks;
+ u64 *bbp = (u64 *)page_address(rdev->bb_page);
+ u64 *p = bb->page;
+ sb->feature_map |= cpu_to_le32(MD_FEATURE_BAD_BLOCKS);
+ if (bb->changed) {
+ unsigned seq;
+
+retry:
+ seq = read_seqbegin(&bb->lock);
+
+ memset(bbp, 0xff, PAGE_SIZE);
+
+ for (i = 0 ; i < bb->count ; i++) {
+ u64 internal_bb = *p++;
+ u64 store_bb = ((BB_OFFSET(internal_bb) << 10)
+ | BB_LEN(internal_bb));
+ *bbp++ = cpu_to_le64(store_bb);
+ }
+ if (read_seqretry(&bb->lock, seq))
+ goto retry;
+
+ bb->sector = (rdev->sb_start +
+ (int)le32_to_cpu(sb->bblog_offset));
+ bb->size = le16_to_cpu(sb->bblog_size);
+ bb->changed = 0;
+ }
+ }
+
max_dev = 0;
list_for_each_entry(rdev2, &mddev->disks, same_set)
if (rdev2->desc_nr+1 > max_dev)
num_sectors = max_sectors;
rdev->sb_start = sb_start;
}
- sb = (struct mdp_superblock_1 *) page_address(rdev->sb_page);
+ sb = page_address(rdev->sb_page);
sb->data_size = cpu_to_le64(num_sectors);
sb->super_offset = rdev->sb_start;
sb->sb_csum = calc_sb_1_csum(sb);
bd_link_disk_holder(rdev->bdev, mddev->gendisk);
/* May as well allow recovery to be retried once */
- mddev->recovery_disabled = 0;
+ mddev->recovery_disabled++;
return 0;
sysfs_remove_link(&rdev->kobj, "block");
sysfs_put(rdev->sysfs_state);
rdev->sysfs_state = NULL;
+ kfree(rdev->badblocks.page);
+ rdev->badblocks.count = 0;
+ rdev->badblocks.page = NULL;
/* We need to delay this, otherwise we can deadlock when
* writing to 'remove' to "dev/state". We also need
* to delay it due to rcu usage.
printk(KERN_INFO "md: rdev superblock (MJ:%d):\n", major_version);
switch (major_version) {
case 0:
- print_sb_90((mdp_super_t*)page_address(rdev->sb_page));
+ print_sb_90(page_address(rdev->sb_page));
break;
case 1:
- print_sb_1((struct mdp_superblock_1 *)page_address(rdev->sb_page));
+ print_sb_1(page_address(rdev->sb_page));
break;
}
} else
mdk_rdev_t *rdev;
int sync_req;
int nospares = 0;
+ int any_badblocks_changed = 0;
repeat:
/* First make sure individual recovery_offsets are correct */
if (!mddev->persistent) {
clear_bit(MD_CHANGE_CLEAN, &mddev->flags);
clear_bit(MD_CHANGE_DEVS, &mddev->flags);
- if (!mddev->external)
+ if (!mddev->external) {
clear_bit(MD_CHANGE_PENDING, &mddev->flags);
+ list_for_each_entry(rdev, &mddev->disks, same_set) {
+ if (rdev->badblocks.changed) {
+ md_ack_all_badblocks(&rdev->badblocks);
+ md_error(mddev, rdev);
+ }
+ clear_bit(Blocked, &rdev->flags);
+ clear_bit(BlockedBadBlocks, &rdev->flags);
+ wake_up(&rdev->blocked_wait);
+ }
+ }
wake_up(&mddev->sb_wait);
return;
}
MD_BUG();
mddev->events --;
}
+
+ list_for_each_entry(rdev, &mddev->disks, same_set) {
+ if (rdev->badblocks.changed)
+ any_badblocks_changed++;
+ if (test_bit(Faulty, &rdev->flags))
+ set_bit(FaultRecorded, &rdev->flags);
+ }
+
sync_sbs(mddev, nospares);
spin_unlock_irq(&mddev->write_lock);
bdevname(rdev->bdev,b),
(unsigned long long)rdev->sb_start);
rdev->sb_events = mddev->events;
+ if (rdev->badblocks.size) {
+ md_super_write(mddev, rdev,
+ rdev->badblocks.sector,
+ rdev->badblocks.size << 9,
+ rdev->bb_page);
+ rdev->badblocks.size = 0;
+ }
} else
dprintk(")\n");
if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
sysfs_notify(&mddev->kobj, NULL, "sync_completed");
+ list_for_each_entry(rdev, &mddev->disks, same_set) {
+ if (test_and_clear_bit(FaultRecorded, &rdev->flags))
+ clear_bit(Blocked, &rdev->flags);
+
+ if (any_badblocks_changed)
+ md_ack_all_badblocks(&rdev->badblocks);
+ clear_bit(BlockedBadBlocks, &rdev->flags);
+ wake_up(&rdev->blocked_wait);
+ }
}
/* words written to sysfs files may, or may not, be \n terminated.
char *sep = "";
size_t len = 0;
- if (test_bit(Faulty, &rdev->flags)) {
+ if (test_bit(Faulty, &rdev->flags) ||
+ rdev->badblocks.unacked_exist) {
len+= sprintf(page+len, "%sfaulty",sep);
sep = ",";
}
len += sprintf(page+len, "%swrite_mostly",sep);
sep = ",";
}
- if (test_bit(Blocked, &rdev->flags)) {
+ if (test_bit(Blocked, &rdev->flags) ||
+ rdev->badblocks.unacked_exist) {
len += sprintf(page+len, "%sblocked", sep);
sep = ",";
}
len += sprintf(page+len, "%sspare", sep);
sep = ",";
}
+ if (test_bit(WriteErrorSeen, &rdev->flags)) {
+ len += sprintf(page+len, "%swrite_error", sep);
+ sep = ",";
+ }
return len+sprintf(page+len, "\n");
}
state_store(mdk_rdev_t *rdev, const char *buf, size_t len)
{
/* can write
- * faulty - simulates and error
+ * faulty - simulates an error
* remove - disconnects the device
* writemostly - sets write_mostly
* -writemostly - clears write_mostly
- * blocked - sets the Blocked flag
- * -blocked - clears the Blocked flag
+ * blocked - sets the Blocked flags
+ * -blocked - clears the Blocked and possibly simulates an error
* insync - sets Insync providing device isn't active
+ * write_error - sets WriteErrorSeen
+ * -write_error - clears WriteErrorSeen
*/
int err = -EINVAL;
if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
set_bit(Blocked, &rdev->flags);
err = 0;
} else if (cmd_match(buf, "-blocked")) {
+ if (!test_bit(Faulty, &rdev->flags) &&
+ test_bit(BlockedBadBlocks, &rdev->flags)) {
+ /* metadata handler doesn't understand badblocks,
+ * so we need to fail the device
+ */
+ md_error(rdev->mddev, rdev);
+ }
clear_bit(Blocked, &rdev->flags);
+ clear_bit(BlockedBadBlocks, &rdev->flags);
wake_up(&rdev->blocked_wait);
set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
md_wakeup_thread(rdev->mddev->thread);
} else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) {
set_bit(In_sync, &rdev->flags);
err = 0;
+ } else if (cmd_match(buf, "write_error")) {
+ set_bit(WriteErrorSeen, &rdev->flags);
+ err = 0;
+ } else if (cmd_match(buf, "-write_error")) {
+ clear_bit(WriteErrorSeen, &rdev->flags);
+ err = 0;
}
if (!err)
sysfs_notify_dirent_safe(rdev->sysfs_state);
{
char *e;
int err;
- char nm[20];
int slot = simple_strtoul(buf, &e, 10);
if (strncmp(buf, "none", 4)==0)
slot = -1;
hot_remove_disk(rdev->mddev, rdev->raid_disk);
if (err)
return err;
- sprintf(nm, "rd%d", rdev->raid_disk);
- sysfs_remove_link(&rdev->mddev->kobj, nm);
+ sysfs_unlink_rdev(rdev->mddev, rdev);
rdev->raid_disk = -1;
set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
md_wakeup_thread(rdev->mddev->thread);
return err;
} else
sysfs_notify_dirent_safe(rdev->sysfs_state);
- sprintf(nm, "rd%d", rdev->raid_disk);
- if (sysfs_create_link(&rdev->mddev->kobj, &rdev->kobj, nm))
+ if (sysfs_link_rdev(rdev->mddev, rdev))
/* failure here is OK */;
/* don't wakeup anyone, leave that to userspace. */
} else {
static struct rdev_sysfs_entry rdev_recovery_start =
__ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store);
+
+static ssize_t
+badblocks_show(struct badblocks *bb, char *page, int unack);
+static ssize_t
+badblocks_store(struct badblocks *bb, const char *page, size_t len, int unack);
+
+static ssize_t bb_show(mdk_rdev_t *rdev, char *page)
+{
+ return badblocks_show(&rdev->badblocks, page, 0);
+}
+static ssize_t bb_store(mdk_rdev_t *rdev, const char *page, size_t len)
+{
+ int rv = badblocks_store(&rdev->badblocks, page, len, 0);
+ /* Maybe that ack was all we needed */
+ if (test_and_clear_bit(BlockedBadBlocks, &rdev->flags))
+ wake_up(&rdev->blocked_wait);
+ return rv;
+}
+static struct rdev_sysfs_entry rdev_bad_blocks =
+__ATTR(bad_blocks, S_IRUGO|S_IWUSR, bb_show, bb_store);
+
+
+static ssize_t ubb_show(mdk_rdev_t *rdev, char *page)
+{
+ return badblocks_show(&rdev->badblocks, page, 1);
+}
+static ssize_t ubb_store(mdk_rdev_t *rdev, const char *page, size_t len)
+{
+ return badblocks_store(&rdev->badblocks, page, len, 1);
+}
+static struct rdev_sysfs_entry rdev_unack_bad_blocks =
+__ATTR(unacknowledged_bad_blocks, S_IRUGO|S_IWUSR, ubb_show, ubb_store);
+
static struct attribute *rdev_default_attrs[] = {
&rdev_state.attr,
&rdev_errors.attr,
&rdev_offset.attr,
&rdev_size.attr,
&rdev_recovery_start.attr,
+ &rdev_bad_blocks.attr,
+ &rdev_unack_bad_blocks.attr,
NULL,
};
static ssize_t
.default_attrs = rdev_default_attrs,
};
-void md_rdev_init(mdk_rdev_t *rdev)
+int md_rdev_init(mdk_rdev_t *rdev)
{
rdev->desc_nr = -1;
rdev->saved_raid_disk = -1;
rdev->sb_events = 0;
rdev->last_read_error.tv_sec = 0;
rdev->last_read_error.tv_nsec = 0;
+ rdev->sb_loaded = 0;
+ rdev->bb_page = NULL;
atomic_set(&rdev->nr_pending, 0);
atomic_set(&rdev->read_errors, 0);
atomic_set(&rdev->corrected_errors, 0);
INIT_LIST_HEAD(&rdev->same_set);
init_waitqueue_head(&rdev->blocked_wait);
+
+ /* Add space to store bad block list.
+ * This reserves the space even on arrays where it cannot
+ * be used - I wonder if that matters
+ */
+ rdev->badblocks.count = 0;
+ rdev->badblocks.shift = 0;
+ rdev->badblocks.page = kmalloc(PAGE_SIZE, GFP_KERNEL);
+ seqlock_init(&rdev->badblocks.lock);
+ if (rdev->badblocks.page == NULL)
+ return -ENOMEM;
+
+ return 0;
}
EXPORT_SYMBOL_GPL(md_rdev_init);
/*
return ERR_PTR(-ENOMEM);
}
- md_rdev_init(rdev);
- if ((err = alloc_disk_sb(rdev)))
+ err = md_rdev_init(rdev);
+ if (err)
+ goto abort_free;
+ err = alloc_disk_sb(rdev);
+ if (err)
goto abort_free;
err = lock_rdev(rdev, newdev, super_format == -2);
goto abort_free;
}
}
+ if (super_format == -1)
+ /* hot-add for 0.90, or non-persistent: so no badblocks */
+ rdev->badblocks.shift = -1;
return rdev;
abort_free:
- if (rdev->sb_page) {
- if (rdev->bdev)
- unlock_rdev(rdev);
- free_disk_sb(rdev);
- }
+ if (rdev->bdev)
+ unlock_rdev(rdev);
+ free_disk_sb(rdev);
+ kfree(rdev->badblocks.page);
kfree(rdev);
return ERR_PTR(err);
}
}
list_for_each_entry(rdev, &mddev->disks, same_set) {
- char nm[20];
if (rdev->raid_disk < 0)
continue;
if (rdev->new_raid_disk >= mddev->raid_disks)
rdev->new_raid_disk = -1;
if (rdev->new_raid_disk == rdev->raid_disk)
continue;
- sprintf(nm, "rd%d", rdev->raid_disk);
- sysfs_remove_link(&mddev->kobj, nm);
+ sysfs_unlink_rdev(mddev, rdev);
}
list_for_each_entry(rdev, &mddev->disks, same_set) {
if (rdev->raid_disk < 0)
if (rdev->raid_disk < 0)
clear_bit(In_sync, &rdev->flags);
else {
- char nm[20];
- sprintf(nm, "rd%d", rdev->raid_disk);
- if(sysfs_create_link(&mddev->kobj, &rdev->kobj, nm))
- printk("md: cannot register %s for %s after level change\n",
- nm, mdname(mddev));
+ if (sysfs_link_rdev(mddev, rdev))
+ printk(KERN_WARNING "md: cannot register rd%d"
+ " for %s after level change\n",
+ rdev->raid_disk, mdname(mddev));
}
}
}
if (mddev->bio_set == NULL)
- mddev->bio_set = bioset_create(BIO_POOL_SIZE, sizeof(mddev));
+ mddev->bio_set = bioset_create(BIO_POOL_SIZE,
+ sizeof(mddev_t *));
spin_lock(&pers_lock);
pers = find_pers(mddev->level, mddev->clevel);
smp_wmb();
mddev->ready = 1;
list_for_each_entry(rdev, &mddev->disks, same_set)
- if (rdev->raid_disk >= 0) {
- char nm[20];
- sprintf(nm, "rd%d", rdev->raid_disk);
- if (sysfs_create_link(&mddev->kobj, &rdev->kobj, nm))
+ if (rdev->raid_disk >= 0)
+ if (sysfs_link_rdev(mddev, rdev))
/* failure here is OK */;
- }
set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
sysfs_notify_dirent_safe(mddev->sysfs_state);
list_for_each_entry(rdev, &mddev->disks, same_set)
- if (rdev->raid_disk >= 0) {
- char nm[20];
- sprintf(nm, "rd%d", rdev->raid_disk);
- sysfs_remove_link(&mddev->kobj, nm);
- }
+ if (rdev->raid_disk >= 0)
+ sysfs_unlink_rdev(mddev, rdev);
set_capacity(disk, 0);
mutex_unlock(&mddev->open_mutex);
if (!rdev || test_bit(Faulty, &rdev->flags))
return;
- if (mddev->external)
- set_bit(Blocked, &rdev->flags);
-/*
- dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
- mdname(mddev),
- MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
- __builtin_return_address(0),__builtin_return_address(1),
- __builtin_return_address(2),__builtin_return_address(3));
-*/
- if (!mddev->pers)
- return;
- if (!mddev->pers->error_handler)
+ if (!mddev->pers || !mddev->pers->error_handler)
return;
mddev->pers->error_handler(mddev,rdev);
if (mddev->degraded)
atomic_add(sectors, &mddev->recovery_active);
}
+ if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
+ break;
+
j += sectors;
if (j>1) mddev->curr_resync = j;
mddev->curr_mark_cnt = io_sectors;
if (last_check == 0)
- /* this is the earliers that rebuilt will be
+ /* this is the earliest that rebuild will be
* visible in /proc/mdstat
*/
md_new_event(mddev);
continue;
last_check = io_sectors;
-
- if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
- break;
-
repeat:
if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
/* step marks */
atomic_read(&rdev->nr_pending)==0) {
if (mddev->pers->hot_remove_disk(
mddev, rdev->raid_disk)==0) {
- char nm[20];
- sprintf(nm,"rd%d", rdev->raid_disk);
- sysfs_remove_link(&mddev->kobj, nm);
+ sysfs_unlink_rdev(mddev, rdev);
rdev->raid_disk = -1;
}
}
- if (mddev->degraded && !mddev->recovery_disabled) {
+ if (mddev->degraded) {
list_for_each_entry(rdev, &mddev->disks, same_set) {
if (rdev->raid_disk >= 0 &&
!test_bit(In_sync, &rdev->flags) &&
- !test_bit(Faulty, &rdev->flags) &&
- !test_bit(Blocked, &rdev->flags))
+ !test_bit(Faulty, &rdev->flags))
spares++;
if (rdev->raid_disk < 0
&& !test_bit(Faulty, &rdev->flags)) {
rdev->recovery_offset = 0;
if (mddev->pers->
hot_add_disk(mddev, rdev) == 0) {
- char nm[20];
- sprintf(nm, "rd%d", rdev->raid_disk);
- if (sysfs_create_link(&mddev->kobj,
- &rdev->kobj, nm))
+ if (sysfs_link_rdev(mddev, rdev))
/* failure here is OK */;
spares++;
md_new_event(mddev);
set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
sysfs_notify_dirent_safe(mddev->sysfs_action);
md_new_event(mddev);
+ if (mddev->event_work.func)
+ queue_work(md_misc_wq, &mddev->event_work);
}
/*
if (mddev->bitmap)
bitmap_daemon_work(mddev);
- if (mddev->ro)
- return;
-
if (signal_pending(current)) {
if (mddev->pers->sync_request && !mddev->external) {
printk(KERN_INFO "md: %s in immediate safe mode\n",
atomic_read(&rdev->nr_pending)==0) {
if (mddev->pers->hot_remove_disk(
mddev, rdev->raid_disk)==0) {
- char nm[20];
- sprintf(nm,"rd%d", rdev->raid_disk);
- sysfs_remove_link(&mddev->kobj, nm);
+ sysfs_unlink_rdev(mddev, rdev);
rdev->raid_disk = -1;
}
}
{
sysfs_notify_dirent_safe(rdev->sysfs_state);
wait_event_timeout(rdev->blocked_wait,
- !test_bit(Blocked, &rdev->flags),
+ !test_bit(Blocked, &rdev->flags) &&
+ !test_bit(BlockedBadBlocks, &rdev->flags),
msecs_to_jiffies(5000));
rdev_dec_pending(rdev, mddev);
}
EXPORT_SYMBOL(md_wait_for_blocked_rdev);
+
+/* Bad block management.
+ * We can record which blocks on each device are 'bad' and so just
+ * fail those blocks, or that stripe, rather than the whole device.
+ * Entries in the bad-block table are 64bits wide. This comprises:
+ * Length of bad-range, in sectors: 0-511 for lengths 1-512
+ * Start of bad-range, sector offset, 54 bits (allows 8 exbibytes)
+ * A 'shift' can be set so that larger blocks are tracked and
+ * consequently larger devices can be covered.
+ * 'Acknowledged' flag - 1 bit. - the most significant bit.
+ *
+ * Locking of the bad-block table uses a seqlock so md_is_badblock
+ * might need to retry if it is very unlucky.
+ * We will sometimes want to check for bad blocks in a bi_end_io function,
+ * so we use the write_seqlock_irq variant.
+ *
+ * When looking for a bad block we specify a range and want to
+ * know if any block in the range is bad. So we binary-search
+ * to the last range that starts at-or-before the given endpoint,
+ * (or "before the sector after the target range")
+ * then see if it ends after the given start.
+ * We return
+ * 0 if there are no known bad blocks in the range
+ * 1 if there are known bad block which are all acknowledged
+ * -1 if there are bad blocks which have not yet been acknowledged in metadata.
+ * plus the start/length of the first bad section we overlap.
+ */
+int md_is_badblock(struct badblocks *bb, sector_t s, int sectors,
+ sector_t *first_bad, int *bad_sectors)
+{
+ int hi;
+ int lo = 0;
+ u64 *p = bb->page;
+ int rv = 0;
+ sector_t target = s + sectors;
+ unsigned seq;
+
+ if (bb->shift > 0) {
+ /* round the start down, and the end up */
+ s >>= bb->shift;
+ target += (1<<bb->shift) - 1;
+ target >>= bb->shift;
+ sectors = target - s;
+ }
+ /* 'target' is now the first block after the bad range */
+
+retry:
+ seq = read_seqbegin(&bb->lock);
+
+ hi = bb->count;
+
+ /* Binary search between lo and hi for 'target'
+ * i.e. for the last range that starts before 'target'
+ */
+ /* INVARIANT: ranges before 'lo' and at-or-after 'hi'
+ * are known not to be the last range before target.
+ * VARIANT: hi-lo is the number of possible
+ * ranges, and decreases until it reaches 1
+ */
+ while (hi - lo > 1) {
+ int mid = (lo + hi) / 2;
+ sector_t a = BB_OFFSET(p[mid]);
+ if (a < target)
+ /* This could still be the one, earlier ranges
+ * could not. */
+ lo = mid;
+ else
+ /* This and later ranges are definitely out. */
+ hi = mid;
+ }
+ /* 'lo' might be the last that started before target, but 'hi' isn't */
+ if (hi > lo) {
+ /* need to check all range that end after 's' to see if
+ * any are unacknowledged.
+ */
+ while (lo >= 0 &&
+ BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > s) {
+ if (BB_OFFSET(p[lo]) < target) {
+ /* starts before the end, and finishes after
+ * the start, so they must overlap
+ */
+ if (rv != -1 && BB_ACK(p[lo]))
+ rv = 1;
+ else
+ rv = -1;
+ *first_bad = BB_OFFSET(p[lo]);
+ *bad_sectors = BB_LEN(p[lo]);
+ }
+ lo--;
+ }
+ }
+
+ if (read_seqretry(&bb->lock, seq))
+ goto retry;
+
+ return rv;
+}
+EXPORT_SYMBOL_GPL(md_is_badblock);
+
+/*
+ * Add a range of bad blocks to the table.
+ * This might extend the table, or might contract it
+ * if two adjacent ranges can be merged.
+ * We binary-search to find the 'insertion' point, then
+ * decide how best to handle it.
+ */
+static int md_set_badblocks(struct badblocks *bb, sector_t s, int sectors,
+ int acknowledged)
+{
+ u64 *p;
+ int lo, hi;
+ int rv = 1;
+
+ if (bb->shift < 0)
+ /* badblocks are disabled */
+ return 0;
+
+ if (bb->shift) {
+ /* round the start down, and the end up */
+ sector_t next = s + sectors;
+ s >>= bb->shift;
+ next += (1<<bb->shift) - 1;
+ next >>= bb->shift;
+ sectors = next - s;
+ }
+
+ write_seqlock_irq(&bb->lock);
+
+ p = bb->page;
+ lo = 0;
+ hi = bb->count;
+ /* Find the last range that starts at-or-before 's' */
+ while (hi - lo > 1) {
+ int mid = (lo + hi) / 2;
+ sector_t a = BB_OFFSET(p[mid]);
+ if (a <= s)
+ lo = mid;
+ else
+ hi = mid;
+ }
+ if (hi > lo && BB_OFFSET(p[lo]) > s)
+ hi = lo;
+
+ if (hi > lo) {
+ /* we found a range that might merge with the start
+ * of our new range
+ */
+ sector_t a = BB_OFFSET(p[lo]);
+ sector_t e = a + BB_LEN(p[lo]);
+ int ack = BB_ACK(p[lo]);
+ if (e >= s) {
+ /* Yes, we can merge with a previous range */
+ if (s == a && s + sectors >= e)
+ /* new range covers old */
+ ack = acknowledged;
+ else
+ ack = ack && acknowledged;
+
+ if (e < s + sectors)
+ e = s + sectors;
+ if (e - a <= BB_MAX_LEN) {
+ p[lo] = BB_MAKE(a, e-a, ack);
+ s = e;
+ } else {
+ /* does not all fit in one range,
+ * make p[lo] maximal
+ */
+ if (BB_LEN(p[lo]) != BB_MAX_LEN)
+ p[lo] = BB_MAKE(a, BB_MAX_LEN, ack);
+ s = a + BB_MAX_LEN;
+ }
+ sectors = e - s;
+ }
+ }
+ if (sectors && hi < bb->count) {
+ /* 'hi' points to the first range that starts after 's'.
+ * Maybe we can merge with the start of that range */
+ sector_t a = BB_OFFSET(p[hi]);
+ sector_t e = a + BB_LEN(p[hi]);
+ int ack = BB_ACK(p[hi]);
+ if (a <= s + sectors) {
+ /* merging is possible */
+ if (e <= s + sectors) {
+ /* full overlap */
+ e = s + sectors;
+ ack = acknowledged;
+ } else
+ ack = ack && acknowledged;
+
+ a = s;
+ if (e - a <= BB_MAX_LEN) {
+ p[hi] = BB_MAKE(a, e-a, ack);
+ s = e;
+ } else {
+ p[hi] = BB_MAKE(a, BB_MAX_LEN, ack);
+ s = a + BB_MAX_LEN;
+ }
+ sectors = e - s;
+ lo = hi;
+ hi++;
+ }
+ }
+ if (sectors == 0 && hi < bb->count) {
+ /* we might be able to combine lo and hi */
+ /* Note: 's' is at the end of 'lo' */
+ sector_t a = BB_OFFSET(p[hi]);
+ int lolen = BB_LEN(p[lo]);
+ int hilen = BB_LEN(p[hi]);
+ int newlen = lolen + hilen - (s - a);
+ if (s >= a && newlen < BB_MAX_LEN) {
+ /* yes, we can combine them */
+ int ack = BB_ACK(p[lo]) && BB_ACK(p[hi]);
+ p[lo] = BB_MAKE(BB_OFFSET(p[lo]), newlen, ack);
+ memmove(p + hi, p + hi + 1,
+ (bb->count - hi - 1) * 8);
+ bb->count--;
+ }
+ }
+ while (sectors) {
+ /* didn't merge (it all).
+ * Need to add a range just before 'hi' */
+ if (bb->count >= MD_MAX_BADBLOCKS) {
+ /* No room for more */
+ rv = 0;
+ break;
+ } else {
+ int this_sectors = sectors;
+ memmove(p + hi + 1, p + hi,
+ (bb->count - hi) * 8);
+ bb->count++;
+
+ if (this_sectors > BB_MAX_LEN)
+ this_sectors = BB_MAX_LEN;
+ p[hi] = BB_MAKE(s, this_sectors, acknowledged);
+ sectors -= this_sectors;
+ s += this_sectors;
+ }
+ }
+
+ bb->changed = 1;
+ if (!acknowledged)
+ bb->unacked_exist = 1;
+ write_sequnlock_irq(&bb->lock);
+
+ return rv;
+}
+
+int rdev_set_badblocks(mdk_rdev_t *rdev, sector_t s, int sectors,
+ int acknowledged)
+{
+ int rv = md_set_badblocks(&rdev->badblocks,
+ s + rdev->data_offset, sectors, acknowledged);
+ if (rv) {
+ /* Make sure they get written out promptly */
+ set_bit(MD_CHANGE_CLEAN, &rdev->mddev->flags);
+ md_wakeup_thread(rdev->mddev->thread);
+ }
+ return rv;
+}
+EXPORT_SYMBOL_GPL(rdev_set_badblocks);
+
+/*
+ * Remove a range of bad blocks from the table.
+ * This may involve extending the table if we spilt a region,
+ * but it must not fail. So if the table becomes full, we just
+ * drop the remove request.
+ */
+static int md_clear_badblocks(struct badblocks *bb, sector_t s, int sectors)
+{
+ u64 *p;
+ int lo, hi;
+ sector_t target = s + sectors;
+ int rv = 0;
+
+ if (bb->shift > 0) {
+ /* When clearing we round the start up and the end down.
+ * This should not matter as the shift should align with
+ * the block size and no rounding should ever be needed.
+ * However it is better the think a block is bad when it
+ * isn't than to think a block is not bad when it is.
+ */
+ s += (1<<bb->shift) - 1;
+ s >>= bb->shift;
+ target >>= bb->shift;
+ sectors = target - s;
+ }
+
+ write_seqlock_irq(&bb->lock);
+
+ p = bb->page;
+ lo = 0;
+ hi = bb->count;
+ /* Find the last range that starts before 'target' */
+ while (hi - lo > 1) {
+ int mid = (lo + hi) / 2;
+ sector_t a = BB_OFFSET(p[mid]);
+ if (a < target)
+ lo = mid;
+ else
+ hi = mid;
+ }
+ if (hi > lo) {
+ /* p[lo] is the last range that could overlap the
+ * current range. Earlier ranges could also overlap,
+ * but only this one can overlap the end of the range.
+ */
+ if (BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > target) {
+ /* Partial overlap, leave the tail of this range */
+ int ack = BB_ACK(p[lo]);
+ sector_t a = BB_OFFSET(p[lo]);
+ sector_t end = a + BB_LEN(p[lo]);
+
+ if (a < s) {
+ /* we need to split this range */
+ if (bb->count >= MD_MAX_BADBLOCKS) {
+ rv = 0;
+ goto out;
+ }
+ memmove(p+lo+1, p+lo, (bb->count - lo) * 8);
+ bb->count++;
+ p[lo] = BB_MAKE(a, s-a, ack);
+ lo++;
+ }
+ p[lo] = BB_MAKE(target, end - target, ack);
+ /* there is no longer an overlap */
+ hi = lo;
+ lo--;
+ }
+ while (lo >= 0 &&
+ BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > s) {
+ /* This range does overlap */
+ if (BB_OFFSET(p[lo]) < s) {
+ /* Keep the early parts of this range. */
+ int ack = BB_ACK(p[lo]);
+ sector_t start = BB_OFFSET(p[lo]);
+ p[lo] = BB_MAKE(start, s - start, ack);
+ /* now low doesn't overlap, so.. */
+ break;
+ }
+ lo--;
+ }
+ /* 'lo' is strictly before, 'hi' is strictly after,
+ * anything between needs to be discarded
+ */
+ if (hi - lo > 1) {
+ memmove(p+lo+1, p+hi, (bb->count - hi) * 8);
+ bb->count -= (hi - lo - 1);
+ }
+ }
+
+ bb->changed = 1;
+out:
+ write_sequnlock_irq(&bb->lock);
+ return rv;
+}
+
+int rdev_clear_badblocks(mdk_rdev_t *rdev, sector_t s, int sectors)
+{
+ return md_clear_badblocks(&rdev->badblocks,
+ s + rdev->data_offset,
+ sectors);
+}
+EXPORT_SYMBOL_GPL(rdev_clear_badblocks);
+
+/*
+ * Acknowledge all bad blocks in a list.
+ * This only succeeds if ->changed is clear. It is used by
+ * in-kernel metadata updates
+ */
+void md_ack_all_badblocks(struct badblocks *bb)
+{
+ if (bb->page == NULL || bb->changed)
+ /* no point even trying */
+ return;
+ write_seqlock_irq(&bb->lock);
+
+ if (bb->changed == 0) {
+ u64 *p = bb->page;
+ int i;
+ for (i = 0; i < bb->count ; i++) {
+ if (!BB_ACK(p[i])) {
+ sector_t start = BB_OFFSET(p[i]);
+ int len = BB_LEN(p[i]);
+ p[i] = BB_MAKE(start, len, 1);
+ }
+ }
+ bb->unacked_exist = 0;
+ }
+ write_sequnlock_irq(&bb->lock);
+}
+EXPORT_SYMBOL_GPL(md_ack_all_badblocks);
+
+/* sysfs access to bad-blocks list.
+ * We present two files.
+ * 'bad-blocks' lists sector numbers and lengths of ranges that
+ * are recorded as bad. The list is truncated to fit within
+ * the one-page limit of sysfs.
+ * Writing "sector length" to this file adds an acknowledged
+ * bad block list.
+ * 'unacknowledged-bad-blocks' lists bad blocks that have not yet
+ * been acknowledged. Writing to this file adds bad blocks
+ * without acknowledging them. This is largely for testing.
+ */
+
+static ssize_t
+badblocks_show(struct badblocks *bb, char *page, int unack)
+{
+ size_t len;
+ int i;
+ u64 *p = bb->page;
+ unsigned seq;
+
+ if (bb->shift < 0)
+ return 0;
+
+retry:
+ seq = read_seqbegin(&bb->lock);
+
+ len = 0;
+ i = 0;
+
+ while (len < PAGE_SIZE && i < bb->count) {
+ sector_t s = BB_OFFSET(p[i]);
+ unsigned int length = BB_LEN(p[i]);
+ int ack = BB_ACK(p[i]);
+ i++;
+
+ if (unack && ack)
+ continue;
+
+ len += snprintf(page+len, PAGE_SIZE-len, "%llu %u\n",
+ (unsigned long long)s << bb->shift,
+ length << bb->shift);
+ }
+ if (unack && len == 0)
+ bb->unacked_exist = 0;
+
+ if (read_seqretry(&bb->lock, seq))
+ goto retry;
+
+ return len;
+}
+
+#define DO_DEBUG 1
+
+static ssize_t
+badblocks_store(struct badblocks *bb, const char *page, size_t len, int unack)
+{
+ unsigned long long sector;
+ int length;
+ char newline;
+#ifdef DO_DEBUG
+ /* Allow clearing via sysfs *only* for testing/debugging.
+ * Normally only a successful write may clear a badblock
+ */
+ int clear = 0;
+ if (page[0] == '-') {
+ clear = 1;
+ page++;
+ }
+#endif /* DO_DEBUG */
+
+ switch (sscanf(page, "%llu %d%c", §or, &length, &newline)) {
+ case 3:
+ if (newline != '\n')
+ return -EINVAL;
+ case 2:
+ if (length <= 0)
+ return -EINVAL;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+#ifdef DO_DEBUG
+ if (clear) {
+ md_clear_badblocks(bb, sector, length);
+ return len;
+ }
+#endif /* DO_DEBUG */
+ if (md_set_badblocks(bb, sector, length, !unack))
+ return len;
+ else
+ return -ENOSPC;
+}
+
static int md_notify_reboot(struct notifier_block *this,
unsigned long code, void *x)
{
typedef struct mddev_s mddev_t;
typedef struct mdk_rdev_s mdk_rdev_t;
+/* Bad block numbers are stored sorted in a single page.
+ * 64bits is used for each block or extent.
+ * 54 bits are sector number, 9 bits are extent size,
+ * 1 bit is an 'acknowledged' flag.
+ */
+#define MD_MAX_BADBLOCKS (PAGE_SIZE/8)
+
/*
* MD's 'extended' device
*/
struct block_device *meta_bdev;
struct block_device *bdev; /* block device handle */
- struct page *sb_page;
+ struct page *sb_page, *bb_page;
int sb_loaded;
__u64 sb_events;
sector_t data_offset; /* start of data in array */
#define In_sync 2 /* device is in_sync with rest of array */
#define WriteMostly 4 /* Avoid reading if at all possible */
#define AutoDetected 7 /* added by auto-detect */
-#define Blocked 8 /* An error occurred on an externally
- * managed array, don't allow writes
+#define Blocked 8 /* An error occurred but has not yet
+ * been acknowledged by the metadata
+ * handler, so don't allow writes
* until it is cleared */
+#define WriteErrorSeen 9 /* A write error has been seen on this
+ * device
+ */
+#define FaultRecorded 10 /* Intermediate state for clearing
+ * Blocked. The Fault is/will-be
+ * recorded in the metadata, but that
+ * metadata hasn't been stored safely
+ * on disk yet.
+ */
+#define BlockedBadBlocks 11 /* A writer is blocked because they
+ * found an unacknowledged bad-block.
+ * This can safely be cleared at any
+ * time, and the writer will re-check.
+ * It may be set at any time, and at
+ * worst the writer will timeout and
+ * re-check. So setting it as
+ * accurately as possible is good, but
+ * not absolutely critical.
+ */
wait_queue_head_t blocked_wait;
int desc_nr; /* descriptor index in the superblock */
struct sysfs_dirent *sysfs_state; /* handle for 'state'
* sysfs entry */
+
+ struct badblocks {
+ int count; /* count of bad blocks */
+ int unacked_exist; /* there probably are unacknowledged
+ * bad blocks. This is only cleared
+ * when a read discovers none
+ */
+ int shift; /* shift from sectors to block size
+ * a -ve shift means badblocks are
+ * disabled.*/
+ u64 *page; /* badblock list */
+ int changed;
+ seqlock_t lock;
+
+ sector_t sector;
+ sector_t size; /* in sectors */
+ } badblocks;
};
+#define BB_LEN_MASK (0x00000000000001FFULL)
+#define BB_OFFSET_MASK (0x7FFFFFFFFFFFFE00ULL)
+#define BB_ACK_MASK (0x8000000000000000ULL)
+#define BB_MAX_LEN 512
+#define BB_OFFSET(x) (((x) & BB_OFFSET_MASK) >> 9)
+#define BB_LEN(x) (((x) & BB_LEN_MASK) + 1)
+#define BB_ACK(x) (!!((x) & BB_ACK_MASK))
+#define BB_MAKE(a, l, ack) (((a)<<9) | ((l)-1) | ((u64)(!!(ack)) << 63))
+
+extern int md_is_badblock(struct badblocks *bb, sector_t s, int sectors,
+ sector_t *first_bad, int *bad_sectors);
+static inline int is_badblock(mdk_rdev_t *rdev, sector_t s, int sectors,
+ sector_t *first_bad, int *bad_sectors)
+{
+ if (unlikely(rdev->badblocks.count)) {
+ int rv = md_is_badblock(&rdev->badblocks, rdev->data_offset + s,
+ sectors,
+ first_bad, bad_sectors);
+ if (rv)
+ *first_bad -= rdev->data_offset;
+ return rv;
+ }
+ return 0;
+}
+extern int rdev_set_badblocks(mdk_rdev_t *rdev, sector_t s, int sectors,
+ int acknowledged);
+extern int rdev_clear_badblocks(mdk_rdev_t *rdev, sector_t s, int sectors);
+extern void md_ack_all_badblocks(struct badblocks *bb);
+
struct mddev_s
{
void *private;
#define MD_RECOVERY_FROZEN 9
unsigned long recovery;
- int recovery_disabled; /* if we detect that recovery
- * will always fail, set this
- * so we don't loop trying */
+ /* If a RAID personality determines that recovery (of a particular
+ * device) will fail due to a read error on the source device, it
+ * takes a copy of this number and does not attempt recovery again
+ * until this number changes.
+ */
+ int recovery_disabled;
int in_sync; /* know to not need resync */
/* 'open_mutex' avoids races between 'md_open' and 'do_md_stop', so
* hot-adding a bitmap. It should
* eventually be settable by sysfs.
*/
- /* When md is serving under dm, it might use a
- * dirty_log to store the bits.
- */
- struct dm_dirty_log *log;
-
struct mutex mutex;
unsigned long chunksize;
unsigned long daemon_sleep; /* how many jiffies between updates? */
return mddev->gendisk ? mddev->gendisk->disk_name : "mdX";
}
+static inline int sysfs_link_rdev(mddev_t *mddev, mdk_rdev_t *rdev)
+{
+ char nm[20];
+ sprintf(nm, "rd%d", rdev->raid_disk);
+ return sysfs_create_link(&mddev->kobj, &rdev->kobj, nm);
+}
+
+static inline void sysfs_unlink_rdev(mddev_t *mddev, mdk_rdev_t *rdev)
+{
+ char nm[20];
+ sprintf(nm, "rd%d", rdev->raid_disk);
+ sysfs_remove_link(&mddev->kobj, nm);
+}
+
/*
* iterates through some rdev ringlist. It's safe to remove the
* current 'rdev'. Dont touch 'tmp' though.
extern int md_run(mddev_t *mddev);
extern void md_stop(mddev_t *mddev);
extern void md_stop_writes(mddev_t *mddev);
-extern void md_rdev_init(mdk_rdev_t *rdev);
+extern int md_rdev_init(mdk_rdev_t *rdev);
extern void mddev_suspend(mddev_t *mddev);
extern void mddev_resume(mddev_t *mddev);
extern struct bio *bio_alloc_mddev(gfp_t gfp_mask, int nr_iovecs,
mddev_t *mddev);
extern int mddev_check_plugged(mddev_t *mddev);
+extern void md_trim_bio(struct bio *bio, int offset, int size);
#endif /* _MD_MD_H */
#include <linux/delay.h>
#include <linux/blkdev.h>
#include <linux/seq_file.h>
+#include <linux/ratelimit.h>
#include "md.h"
#include "raid1.h"
#include "bitmap.h"
#define DEBUG 0
-#if DEBUG
-#define PRINTK(x...) printk(x)
-#else
-#define PRINTK(x...)
-#endif
+#define PRINTK(x...) do { if (DEBUG) printk(x); } while (0)
/*
* Number of guaranteed r1bios in case of extreme VM load:
for (i = 0; i < conf->raid_disks; i++) {
struct bio **bio = r1_bio->bios + i;
- if (*bio && *bio != IO_BLOCKED)
+ if (!BIO_SPECIAL(*bio))
bio_put(*bio);
*bio = NULL;
}
{
conf_t *conf = r1_bio->mddev->private;
- /*
- * Wake up any possible resync thread that waits for the device
- * to go idle.
- */
- allow_barrier(conf);
-
put_all_bios(conf, r1_bio);
mempool_free(r1_bio, conf->r1bio_pool);
}
* operation and are ready to return a success/failure code to the buffer
* cache layer.
*/
+static void call_bio_endio(r1bio_t *r1_bio)
+{
+ struct bio *bio = r1_bio->master_bio;
+ int done;
+ conf_t *conf = r1_bio->mddev->private;
+
+ if (bio->bi_phys_segments) {
+ unsigned long flags;
+ spin_lock_irqsave(&conf->device_lock, flags);
+ bio->bi_phys_segments--;
+ done = (bio->bi_phys_segments == 0);
+ spin_unlock_irqrestore(&conf->device_lock, flags);
+ } else
+ done = 1;
+
+ if (!test_bit(R1BIO_Uptodate, &r1_bio->state))
+ clear_bit(BIO_UPTODATE, &bio->bi_flags);
+ if (done) {
+ bio_endio(bio, 0);
+ /*
+ * Wake up any possible resync thread that waits for the device
+ * to go idle.
+ */
+ allow_barrier(conf);
+ }
+}
+
static void raid_end_bio_io(r1bio_t *r1_bio)
{
struct bio *bio = r1_bio->master_bio;
(unsigned long long) bio->bi_sector +
(bio->bi_size >> 9) - 1);
- bio_endio(bio,
- test_bit(R1BIO_Uptodate, &r1_bio->state) ? 0 : -EIO);
+ call_bio_endio(r1_bio);
}
free_r1bio(r1_bio);
}
* oops, read error:
*/
char b[BDEVNAME_SIZE];
- if (printk_ratelimit())
- printk(KERN_ERR "md/raid1:%s: %s: rescheduling sector %llu\n",
- mdname(conf->mddev),
- bdevname(conf->mirrors[mirror].rdev->bdev,b), (unsigned long long)r1_bio->sector);
+ printk_ratelimited(
+ KERN_ERR "md/raid1:%s: %s: "
+ "rescheduling sector %llu\n",
+ mdname(conf->mddev),
+ bdevname(conf->mirrors[mirror].rdev->bdev,
+ b),
+ (unsigned long long)r1_bio->sector);
+ set_bit(R1BIO_ReadError, &r1_bio->state);
reschedule_retry(r1_bio);
}
rdev_dec_pending(conf->mirrors[mirror].rdev, conf->mddev);
}
+static void close_write(r1bio_t *r1_bio)
+{
+ /* it really is the end of this request */
+ if (test_bit(R1BIO_BehindIO, &r1_bio->state)) {
+ /* free extra copy of the data pages */
+ int i = r1_bio->behind_page_count;
+ while (i--)
+ safe_put_page(r1_bio->behind_bvecs[i].bv_page);
+ kfree(r1_bio->behind_bvecs);
+ r1_bio->behind_bvecs = NULL;
+ }
+ /* clear the bitmap if all writes complete successfully */
+ bitmap_endwrite(r1_bio->mddev->bitmap, r1_bio->sector,
+ r1_bio->sectors,
+ !test_bit(R1BIO_Degraded, &r1_bio->state),
+ test_bit(R1BIO_BehindIO, &r1_bio->state));
+ md_write_end(r1_bio->mddev);
+}
+
static void r1_bio_write_done(r1bio_t *r1_bio)
{
- if (atomic_dec_and_test(&r1_bio->remaining))
- {
- /* it really is the end of this request */
- if (test_bit(R1BIO_BehindIO, &r1_bio->state)) {
- /* free extra copy of the data pages */
- int i = r1_bio->behind_page_count;
- while (i--)
- safe_put_page(r1_bio->behind_pages[i]);
- kfree(r1_bio->behind_pages);
- r1_bio->behind_pages = NULL;
- }
- /* clear the bitmap if all writes complete successfully */
- bitmap_endwrite(r1_bio->mddev->bitmap, r1_bio->sector,
- r1_bio->sectors,
- !test_bit(R1BIO_Degraded, &r1_bio->state),
- test_bit(R1BIO_BehindIO, &r1_bio->state));
- md_write_end(r1_bio->mddev);
- raid_end_bio_io(r1_bio);
+ if (!atomic_dec_and_test(&r1_bio->remaining))
+ return;
+
+ if (test_bit(R1BIO_WriteError, &r1_bio->state))
+ reschedule_retry(r1_bio);
+ else {
+ close_write(r1_bio);
+ if (test_bit(R1BIO_MadeGood, &r1_bio->state))
+ reschedule_retry(r1_bio);
+ else
+ raid_end_bio_io(r1_bio);
}
}
/*
* 'one mirror IO has finished' event handler:
*/
- r1_bio->bios[mirror] = NULL;
- to_put = bio;
if (!uptodate) {
- md_error(r1_bio->mddev, conf->mirrors[mirror].rdev);
- /* an I/O failed, we can't clear the bitmap */
- set_bit(R1BIO_Degraded, &r1_bio->state);
- } else
+ set_bit(WriteErrorSeen,
+ &conf->mirrors[mirror].rdev->flags);
+ set_bit(R1BIO_WriteError, &r1_bio->state);
+ } else {
/*
* Set R1BIO_Uptodate in our master bio, so that we
* will return a good error code for to the higher
* to user-side. So if something waits for IO, then it
* will wait for the 'master' bio.
*/
+ sector_t first_bad;
+ int bad_sectors;
+
+ r1_bio->bios[mirror] = NULL;
+ to_put = bio;
set_bit(R1BIO_Uptodate, &r1_bio->state);
+ /* Maybe we can clear some bad blocks. */
+ if (is_badblock(conf->mirrors[mirror].rdev,
+ r1_bio->sector, r1_bio->sectors,
+ &first_bad, &bad_sectors)) {
+ r1_bio->bios[mirror] = IO_MADE_GOOD;
+ set_bit(R1BIO_MadeGood, &r1_bio->state);
+ }
+ }
+
update_head_pos(mirror, r1_bio);
if (behind) {
(unsigned long long) mbio->bi_sector,
(unsigned long long) mbio->bi_sector +
(mbio->bi_size >> 9) - 1);
- bio_endio(mbio, 0);
+ call_bio_endio(r1_bio);
}
}
}
- rdev_dec_pending(conf->mirrors[mirror].rdev, conf->mddev);
+ if (r1_bio->bios[mirror] == NULL)
+ rdev_dec_pending(conf->mirrors[mirror].rdev,
+ conf->mddev);
/*
* Let's see if all mirrored write operations have finished
*
* The rdev for the device selected will have nr_pending incremented.
*/
-static int read_balance(conf_t *conf, r1bio_t *r1_bio)
+static int read_balance(conf_t *conf, r1bio_t *r1_bio, int *max_sectors)
{
const sector_t this_sector = r1_bio->sector;
- const int sectors = r1_bio->sectors;
+ int sectors;
+ int best_good_sectors;
int start_disk;
int best_disk;
int i;
* We take the first readable disk when above the resync window.
*/
retry:
+ sectors = r1_bio->sectors;
best_disk = -1;
best_dist = MaxSector;
+ best_good_sectors = 0;
+
if (conf->mddev->recovery_cp < MaxSector &&
(this_sector + sectors >= conf->next_resync)) {
choose_first = 1;
for (i = 0 ; i < conf->raid_disks ; i++) {
sector_t dist;
+ sector_t first_bad;
+ int bad_sectors;
+
int disk = start_disk + i;
if (disk >= conf->raid_disks)
disk -= conf->raid_disks;
/* This is a reasonable device to use. It might
* even be best.
*/
+ if (is_badblock(rdev, this_sector, sectors,
+ &first_bad, &bad_sectors)) {
+ if (best_dist < MaxSector)
+ /* already have a better device */
+ continue;
+ if (first_bad <= this_sector) {
+ /* cannot read here. If this is the 'primary'
+ * device, then we must not read beyond
+ * bad_sectors from another device..
+ */
+ bad_sectors -= (this_sector - first_bad);
+ if (choose_first && sectors > bad_sectors)
+ sectors = bad_sectors;
+ if (best_good_sectors > sectors)
+ best_good_sectors = sectors;
+
+ } else {
+ sector_t good_sectors = first_bad - this_sector;
+ if (good_sectors > best_good_sectors) {
+ best_good_sectors = good_sectors;
+ best_disk = disk;
+ }
+ if (choose_first)
+ break;
+ }
+ continue;
+ } else
+ best_good_sectors = sectors;
+
dist = abs(this_sector - conf->mirrors[disk].head_position);
if (choose_first
/* Don't change to another disk for sequential reads */
rdev_dec_pending(rdev, conf->mddev);
goto retry;
}
+ sectors = best_good_sectors;
conf->next_seq_sect = this_sector + sectors;
conf->last_used = best_disk;
}
rcu_read_unlock();
+ *max_sectors = sectors;
return best_disk;
}
{
int i;
struct bio_vec *bvec;
- struct page **pages = kzalloc(bio->bi_vcnt * sizeof(struct page*),
+ struct bio_vec *bvecs = kzalloc(bio->bi_vcnt * sizeof(struct bio_vec),
GFP_NOIO);
- if (unlikely(!pages))
+ if (unlikely(!bvecs))
return;
bio_for_each_segment(bvec, bio, i) {
- pages[i] = alloc_page(GFP_NOIO);
- if (unlikely(!pages[i]))
+ bvecs[i] = *bvec;
+ bvecs[i].bv_page = alloc_page(GFP_NOIO);
+ if (unlikely(!bvecs[i].bv_page))
goto do_sync_io;
- memcpy(kmap(pages[i]) + bvec->bv_offset,
- kmap(bvec->bv_page) + bvec->bv_offset, bvec->bv_len);
- kunmap(pages[i]);
+ memcpy(kmap(bvecs[i].bv_page) + bvec->bv_offset,
+ kmap(bvec->bv_page) + bvec->bv_offset, bvec->bv_len);
+ kunmap(bvecs[i].bv_page);
kunmap(bvec->bv_page);
}
- r1_bio->behind_pages = pages;
+ r1_bio->behind_bvecs = bvecs;
r1_bio->behind_page_count = bio->bi_vcnt;
set_bit(R1BIO_BehindIO, &r1_bio->state);
return;
do_sync_io:
for (i = 0; i < bio->bi_vcnt; i++)
- if (pages[i])
- put_page(pages[i]);
- kfree(pages);
+ if (bvecs[i].bv_page)
+ put_page(bvecs[i].bv_page);
+ kfree(bvecs);
PRINTK("%dB behind alloc failed, doing sync I/O\n", bio->bi_size);
}
mirror_info_t *mirror;
r1bio_t *r1_bio;
struct bio *read_bio;
- int i, targets = 0, disks;
+ int i, disks;
struct bitmap *bitmap;
unsigned long flags;
const int rw = bio_data_dir(bio);
const unsigned long do_flush_fua = (bio->bi_rw & (REQ_FLUSH | REQ_FUA));
mdk_rdev_t *blocked_rdev;
int plugged;
+ int first_clone;
+ int sectors_handled;
+ int max_sectors;
/*
* Register the new request and wait if the reconstruction
r1_bio->mddev = mddev;
r1_bio->sector = bio->bi_sector;
+ /* We might need to issue multiple reads to different
+ * devices if there are bad blocks around, so we keep
+ * track of the number of reads in bio->bi_phys_segments.
+ * If this is 0, there is only one r1_bio and no locking
+ * will be needed when requests complete. If it is
+ * non-zero, then it is the number of not-completed requests.
+ */
+ bio->bi_phys_segments = 0;
+ clear_bit(BIO_SEG_VALID, &bio->bi_flags);
+
if (rw == READ) {
/*
* read balancing logic:
*/
- int rdisk = read_balance(conf, r1_bio);
+ int rdisk;
+
+read_again:
+ rdisk = read_balance(conf, r1_bio, &max_sectors);
if (rdisk < 0) {
/* couldn't find anywhere to read from */
r1_bio->read_disk = rdisk;
read_bio = bio_clone_mddev(bio, GFP_NOIO, mddev);
+ md_trim_bio(read_bio, r1_bio->sector - bio->bi_sector,
+ max_sectors);
r1_bio->bios[rdisk] = read_bio;
read_bio->bi_rw = READ | do_sync;
read_bio->bi_private = r1_bio;
- generic_make_request(read_bio);
+ if (max_sectors < r1_bio->sectors) {
+ /* could not read all from this device, so we will
+ * need another r1_bio.
+ */
+
+ sectors_handled = (r1_bio->sector + max_sectors
+ - bio->bi_sector);
+ r1_bio->sectors = max_sectors;
+ spin_lock_irq(&conf->device_lock);
+ if (bio->bi_phys_segments == 0)
+ bio->bi_phys_segments = 2;
+ else
+ bio->bi_phys_segments++;
+ spin_unlock_irq(&conf->device_lock);
+ /* Cannot call generic_make_request directly
+ * as that will be queued in __make_request
+ * and subsequent mempool_alloc might block waiting
+ * for it. So hand bio over to raid1d.
+ */
+ reschedule_retry(r1_bio);
+
+ r1_bio = mempool_alloc(conf->r1bio_pool, GFP_NOIO);
+
+ r1_bio->master_bio = bio;
+ r1_bio->sectors = (bio->bi_size >> 9) - sectors_handled;
+ r1_bio->state = 0;
+ r1_bio->mddev = mddev;
+ r1_bio->sector = bio->bi_sector + sectors_handled;
+ goto read_again;
+ } else
+ generic_make_request(read_bio);
return 0;
}
/*
* WRITE:
*/
- /* first select target devices under spinlock and
+ /* first select target devices under rcu_lock and
* inc refcount on their rdev. Record them by setting
* bios[x] to bio
+ * If there are known/acknowledged bad blocks on any device on
+ * which we have seen a write error, we want to avoid writing those
+ * blocks.
+ * This potentially requires several writes to write around
+ * the bad blocks. Each set of writes gets it's own r1bio
+ * with a set of bios attached.
*/
plugged = mddev_check_plugged(mddev);
retry_write:
blocked_rdev = NULL;
rcu_read_lock();
+ max_sectors = r1_bio->sectors;
for (i = 0; i < disks; i++) {
mdk_rdev_t *rdev = rcu_dereference(conf->mirrors[i].rdev);
if (rdev && unlikely(test_bit(Blocked, &rdev->flags))) {
blocked_rdev = rdev;
break;
}
- if (rdev && !test_bit(Faulty, &rdev->flags)) {
- atomic_inc(&rdev->nr_pending);
- if (test_bit(Faulty, &rdev->flags)) {
+ r1_bio->bios[i] = NULL;
+ if (!rdev || test_bit(Faulty, &rdev->flags)) {
+ set_bit(R1BIO_Degraded, &r1_bio->state);
+ continue;
+ }
+
+ atomic_inc(&rdev->nr_pending);
+ if (test_bit(WriteErrorSeen, &rdev->flags)) {
+ sector_t first_bad;
+ int bad_sectors;
+ int is_bad;
+
+ is_bad = is_badblock(rdev, r1_bio->sector,
+ max_sectors,
+ &first_bad, &bad_sectors);
+ if (is_bad < 0) {
+ /* mustn't write here until the bad block is
+ * acknowledged*/
+ set_bit(BlockedBadBlocks, &rdev->flags);
+ blocked_rdev = rdev;
+ break;
+ }
+ if (is_bad && first_bad <= r1_bio->sector) {
+ /* Cannot write here at all */
+ bad_sectors -= (r1_bio->sector - first_bad);
+ if (bad_sectors < max_sectors)
+ /* mustn't write more than bad_sectors
+ * to other devices yet
+ */
+ max_sectors = bad_sectors;
rdev_dec_pending(rdev, mddev);
- r1_bio->bios[i] = NULL;
- } else {
- r1_bio->bios[i] = bio;
- targets++;
+ /* We don't set R1BIO_Degraded as that
+ * only applies if the disk is
+ * missing, so it might be re-added,
+ * and we want to know to recover this
+ * chunk.
+ * In this case the device is here,
+ * and the fact that this chunk is not
+ * in-sync is recorded in the bad
+ * block log
+ */
+ continue;
}
- } else
- r1_bio->bios[i] = NULL;
+ if (is_bad) {
+ int good_sectors = first_bad - r1_bio->sector;
+ if (good_sectors < max_sectors)
+ max_sectors = good_sectors;
+ }
+ }
+ r1_bio->bios[i] = bio;
}
rcu_read_unlock();
for (j = 0; j < i; j++)
if (r1_bio->bios[j])
rdev_dec_pending(conf->mirrors[j].rdev, mddev);
-
+ r1_bio->state = 0;
allow_barrier(conf);
md_wait_for_blocked_rdev(blocked_rdev, mddev);
wait_barrier(conf);
goto retry_write;
}
- BUG_ON(targets == 0); /* we never fail the last device */
-
- if (targets < conf->raid_disks) {
- /* array is degraded, we will not clear the bitmap
- * on I/O completion (see raid1_end_write_request) */
- set_bit(R1BIO_Degraded, &r1_bio->state);
+ if (max_sectors < r1_bio->sectors) {
+ /* We are splitting this write into multiple parts, so
+ * we need to prepare for allocating another r1_bio.
+ */
+ r1_bio->sectors = max_sectors;
+ spin_lock_irq(&conf->device_lock);
+ if (bio->bi_phys_segments == 0)
+ bio->bi_phys_segments = 2;
+ else
+ bio->bi_phys_segments++;
+ spin_unlock_irq(&conf->device_lock);
}
-
- /* do behind I/O ?
- * Not if there are too many, or cannot allocate memory,
- * or a reader on WriteMostly is waiting for behind writes
- * to flush */
- if (bitmap &&
- (atomic_read(&bitmap->behind_writes)
- < mddev->bitmap_info.max_write_behind) &&
- !waitqueue_active(&bitmap->behind_wait))
- alloc_behind_pages(bio, r1_bio);
+ sectors_handled = r1_bio->sector + max_sectors - bio->bi_sector;
atomic_set(&r1_bio->remaining, 1);
atomic_set(&r1_bio->behind_remaining, 0);
- bitmap_startwrite(bitmap, bio->bi_sector, r1_bio->sectors,
- test_bit(R1BIO_BehindIO, &r1_bio->state));
+ first_clone = 1;
for (i = 0; i < disks; i++) {
struct bio *mbio;
if (!r1_bio->bios[i])
continue;
mbio = bio_clone_mddev(bio, GFP_NOIO, mddev);
- r1_bio->bios[i] = mbio;
-
- mbio->bi_sector = r1_bio->sector + conf->mirrors[i].rdev->data_offset;
- mbio->bi_bdev = conf->mirrors[i].rdev->bdev;
- mbio->bi_end_io = raid1_end_write_request;
- mbio->bi_rw = WRITE | do_flush_fua | do_sync;
- mbio->bi_private = r1_bio;
-
- if (r1_bio->behind_pages) {
+ md_trim_bio(mbio, r1_bio->sector - bio->bi_sector, max_sectors);
+
+ if (first_clone) {
+ /* do behind I/O ?
+ * Not if there are too many, or cannot
+ * allocate memory, or a reader on WriteMostly
+ * is waiting for behind writes to flush */
+ if (bitmap &&
+ (atomic_read(&bitmap->behind_writes)
+ < mddev->bitmap_info.max_write_behind) &&
+ !waitqueue_active(&bitmap->behind_wait))
+ alloc_behind_pages(mbio, r1_bio);
+
+ bitmap_startwrite(bitmap, r1_bio->sector,
+ r1_bio->sectors,
+ test_bit(R1BIO_BehindIO,
+ &r1_bio->state));
+ first_clone = 0;
+ }
+ if (r1_bio->behind_bvecs) {
struct bio_vec *bvec;
int j;
* them all
*/
__bio_for_each_segment(bvec, mbio, j, 0)
- bvec->bv_page = r1_bio->behind_pages[j];
+ bvec->bv_page = r1_bio->behind_bvecs[j].bv_page;
if (test_bit(WriteMostly, &conf->mirrors[i].rdev->flags))
atomic_inc(&r1_bio->behind_remaining);
}
+ r1_bio->bios[i] = mbio;
+
+ mbio->bi_sector = (r1_bio->sector +
+ conf->mirrors[i].rdev->data_offset);
+ mbio->bi_bdev = conf->mirrors[i].rdev->bdev;
+ mbio->bi_end_io = raid1_end_write_request;
+ mbio->bi_rw = WRITE | do_flush_fua | do_sync;
+ mbio->bi_private = r1_bio;
+
atomic_inc(&r1_bio->remaining);
spin_lock_irqsave(&conf->device_lock, flags);
bio_list_add(&conf->pending_bio_list, mbio);
/* In case raid1d snuck in to freeze_array */
wake_up(&conf->wait_barrier);
+ if (sectors_handled < (bio->bi_size >> 9)) {
+ /* We need another r1_bio. It has already been counted
+ * in bio->bi_phys_segments
+ */
+ r1_bio = mempool_alloc(conf->r1bio_pool, GFP_NOIO);
+ r1_bio->master_bio = bio;
+ r1_bio->sectors = (bio->bi_size >> 9) - sectors_handled;
+ r1_bio->state = 0;
+ r1_bio->mddev = mddev;
+ r1_bio->sector = bio->bi_sector + sectors_handled;
+ goto retry_write;
+ }
+
if (do_sync || !bitmap || !plugged)
md_wakeup_thread(mddev->thread);
* However don't try a recovery from this drive as
* it is very likely to fail.
*/
- mddev->recovery_disabled = 1;
+ conf->recovery_disabled = mddev->recovery_disabled;
return;
}
+ set_bit(Blocked, &rdev->flags);
if (test_and_clear_bit(In_sync, &rdev->flags)) {
unsigned long flags;
spin_lock_irqsave(&conf->device_lock, flags);
&& !test_bit(Faulty, &rdev->flags)
&& !test_and_set_bit(In_sync, &rdev->flags)) {
count++;
- sysfs_notify_dirent(rdev->sysfs_state);
+ sysfs_notify_dirent_safe(rdev->sysfs_state);
}
}
spin_lock_irqsave(&conf->device_lock, flags);
int first = 0;
int last = mddev->raid_disks - 1;
+ if (mddev->recovery_disabled == conf->recovery_disabled)
+ return -EBUSY;
+
if (rdev->raid_disk >= 0)
first = last = rdev->raid_disk;
* is not possible.
*/
if (!test_bit(Faulty, &rdev->flags) &&
- !mddev->recovery_disabled &&
+ mddev->recovery_disabled != conf->recovery_disabled &&
mddev->degraded < conf->raid_disks) {
err = -EBUSY;
goto abort;
conf_t *conf = mddev->private;
int i;
int mirror=0;
+ sector_t first_bad;
+ int bad_sectors;
for (i = 0; i < conf->raid_disks; i++)
if (r1_bio->bios[i] == bio) {
s += sync_blocks;
sectors_to_go -= sync_blocks;
} while (sectors_to_go > 0);
- md_error(mddev, conf->mirrors[mirror].rdev);
- }
+ set_bit(WriteErrorSeen,
+ &conf->mirrors[mirror].rdev->flags);
+ set_bit(R1BIO_WriteError, &r1_bio->state);
+ } else if (is_badblock(conf->mirrors[mirror].rdev,
+ r1_bio->sector,
+ r1_bio->sectors,
+ &first_bad, &bad_sectors) &&
+ !is_badblock(conf->mirrors[r1_bio->read_disk].rdev,
+ r1_bio->sector,
+ r1_bio->sectors,
+ &first_bad, &bad_sectors)
+ )
+ set_bit(R1BIO_MadeGood, &r1_bio->state);
update_head_pos(mirror, r1_bio);
if (atomic_dec_and_test(&r1_bio->remaining)) {
- sector_t s = r1_bio->sectors;
- put_buf(r1_bio);
- md_done_sync(mddev, s, uptodate);
+ int s = r1_bio->sectors;
+ if (test_bit(R1BIO_MadeGood, &r1_bio->state) ||
+ test_bit(R1BIO_WriteError, &r1_bio->state))
+ reschedule_retry(r1_bio);
+ else {
+ put_buf(r1_bio);
+ md_done_sync(mddev, s, uptodate);
+ }
}
}
+static int r1_sync_page_io(mdk_rdev_t *rdev, sector_t sector,
+ int sectors, struct page *page, int rw)
+{
+ if (sync_page_io(rdev, sector, sectors << 9, page, rw, false))
+ /* success */
+ return 1;
+ if (rw == WRITE)
+ set_bit(WriteErrorSeen, &rdev->flags);
+ /* need to record an error - either for the block or the device */
+ if (!rdev_set_badblocks(rdev, sector, sectors, 0))
+ md_error(rdev->mddev, rdev);
+ return 0;
+}
+
static int fix_sync_read_error(r1bio_t *r1_bio)
{
/* Try some synchronous reads of other devices to get
* We don't need to freeze the array, because being in an
* active sync request, there is no normal IO, and
* no overlapping syncs.
+ * We don't need to check is_badblock() again as we
+ * made sure that anything with a bad block in range
+ * will have bi_end_io clear.
*/
mddev_t *mddev = r1_bio->mddev;
conf_t *conf = mddev->private;
* active, and resync is currently active
*/
rdev = conf->mirrors[d].rdev;
- if (sync_page_io(rdev,
- sect,
- s<<9,
+ if (sync_page_io(rdev, sect, s<<9,
bio->bi_io_vec[idx].bv_page,
READ, false)) {
success = 1;
if (!success) {
char b[BDEVNAME_SIZE];
- /* Cannot read from anywhere, array is toast */
- md_error(mddev, conf->mirrors[r1_bio->read_disk].rdev);
+ int abort = 0;
+ /* Cannot read from anywhere, this block is lost.
+ * Record a bad block on each device. If that doesn't
+ * work just disable and interrupt the recovery.
+ * Don't fail devices as that won't really help.
+ */
printk(KERN_ALERT "md/raid1:%s: %s: unrecoverable I/O read error"
" for block %llu\n",
mdname(mddev),
bdevname(bio->bi_bdev, b),
(unsigned long long)r1_bio->sector);
- md_done_sync(mddev, r1_bio->sectors, 0);
- put_buf(r1_bio);
- return 0;
+ for (d = 0; d < conf->raid_disks; d++) {
+ rdev = conf->mirrors[d].rdev;
+ if (!rdev || test_bit(Faulty, &rdev->flags))
+ continue;
+ if (!rdev_set_badblocks(rdev, sect, s, 0))
+ abort = 1;
+ }
+ if (abort) {
+ mddev->recovery_disabled = 1;
+ set_bit(MD_RECOVERY_INTR, &mddev->recovery);
+ md_done_sync(mddev, r1_bio->sectors, 0);
+ put_buf(r1_bio);
+ return 0;
+ }
+ /* Try next page */
+ sectors -= s;
+ sect += s;
+ idx++;
+ continue;
}
start = d;
if (r1_bio->bios[d]->bi_end_io != end_sync_read)
continue;
rdev = conf->mirrors[d].rdev;
- if (sync_page_io(rdev,
- sect,
- s<<9,
- bio->bi_io_vec[idx].bv_page,
- WRITE, false) == 0) {
+ if (r1_sync_page_io(rdev, sect, s,
+ bio->bi_io_vec[idx].bv_page,
+ WRITE) == 0) {
r1_bio->bios[d]->bi_end_io = NULL;
rdev_dec_pending(rdev, mddev);
- md_error(mddev, rdev);
- } else
- atomic_add(s, &rdev->corrected_errors);
+ }
}
d = start;
while (d != r1_bio->read_disk) {
if (r1_bio->bios[d]->bi_end_io != end_sync_read)
continue;
rdev = conf->mirrors[d].rdev;
- if (sync_page_io(rdev,
- sect,
- s<<9,
- bio->bi_io_vec[idx].bv_page,
- READ, false) == 0)
- md_error(mddev, rdev);
+ if (r1_sync_page_io(rdev, sect, s,
+ bio->bi_io_vec[idx].bv_page,
+ READ) != 0)
+ atomic_add(s, &rdev->corrected_errors);
}
sectors -= s;
sect += s;
*
* 1. Retries failed read operations on working mirrors.
* 2. Updates the raid superblock when problems encounter.
- * 3. Performs writes following reads for array syncronising.
+ * 3. Performs writes following reads for array synchronising.
*/
static void fix_read_error(conf_t *conf, int read_disk,
* which is the thread that might remove
* a device. If raid1d ever becomes multi-threaded....
*/
+ sector_t first_bad;
+ int bad_sectors;
+
rdev = conf->mirrors[d].rdev;
if (rdev &&
test_bit(In_sync, &rdev->flags) &&
+ is_badblock(rdev, sect, s,
+ &first_bad, &bad_sectors) == 0 &&
sync_page_io(rdev, sect, s<<9,
conf->tmppage, READ, false))
success = 1;
} while (!success && d != read_disk);
if (!success) {
- /* Cannot read from anywhere -- bye bye array */
- md_error(mddev, conf->mirrors[read_disk].rdev);
+ /* Cannot read from anywhere - mark it bad */
+ mdk_rdev_t *rdev = conf->mirrors[read_disk].rdev;
+ if (!rdev_set_badblocks(rdev, sect, s, 0))
+ md_error(mddev, rdev);
break;
}
/* write it back and re-read */
d--;
rdev = conf->mirrors[d].rdev;
if (rdev &&
- test_bit(In_sync, &rdev->flags)) {
- if (sync_page_io(rdev, sect, s<<9,
- conf->tmppage, WRITE, false)
- == 0)
- /* Well, this device is dead */
- md_error(mddev, rdev);
- }
+ test_bit(In_sync, &rdev->flags))
+ r1_sync_page_io(rdev, sect, s,
+ conf->tmppage, WRITE);
}
d = start;
while (d != read_disk) {
rdev = conf->mirrors[d].rdev;
if (rdev &&
test_bit(In_sync, &rdev->flags)) {
- if (sync_page_io(rdev, sect, s<<9,
- conf->tmppage, READ, false)
- == 0)
- /* Well, this device is dead */
- md_error(mddev, rdev);
- else {
+ if (r1_sync_page_io(rdev, sect, s,
+ conf->tmppage, READ)) {
atomic_add(s, &rdev->corrected_errors);
printk(KERN_INFO
"md/raid1:%s: read error corrected "
}
}
+static void bi_complete(struct bio *bio, int error)
+{
+ complete((struct completion *)bio->bi_private);
+}
+
+static int submit_bio_wait(int rw, struct bio *bio)
+{
+ struct completion event;
+ rw |= REQ_SYNC;
+
+ init_completion(&event);
+ bio->bi_private = &event;
+ bio->bi_end_io = bi_complete;
+ submit_bio(rw, bio);
+ wait_for_completion(&event);
+
+ return test_bit(BIO_UPTODATE, &bio->bi_flags);
+}
+
+static int narrow_write_error(r1bio_t *r1_bio, int i)
+{
+ mddev_t *mddev = r1_bio->mddev;
+ conf_t *conf = mddev->private;
+ mdk_rdev_t *rdev = conf->mirrors[i].rdev;
+ int vcnt, idx;
+ struct bio_vec *vec;
+
+ /* bio has the data to be written to device 'i' where
+ * we just recently had a write error.
+ * We repeatedly clone the bio and trim down to one block,
+ * then try the write. Where the write fails we record
+ * a bad block.
+ * It is conceivable that the bio doesn't exactly align with
+ * blocks. We must handle this somehow.
+ *
+ * We currently own a reference on the rdev.
+ */
+
+ int block_sectors;
+ sector_t sector;
+ int sectors;
+ int sect_to_write = r1_bio->sectors;
+ int ok = 1;
+
+ if (rdev->badblocks.shift < 0)
+ return 0;
+
+ block_sectors = 1 << rdev->badblocks.shift;
+ sector = r1_bio->sector;
+ sectors = ((sector + block_sectors)
+ & ~(sector_t)(block_sectors - 1))
+ - sector;
+
+ if (test_bit(R1BIO_BehindIO, &r1_bio->state)) {
+ vcnt = r1_bio->behind_page_count;
+ vec = r1_bio->behind_bvecs;
+ idx = 0;
+ while (vec[idx].bv_page == NULL)
+ idx++;
+ } else {
+ vcnt = r1_bio->master_bio->bi_vcnt;
+ vec = r1_bio->master_bio->bi_io_vec;
+ idx = r1_bio->master_bio->bi_idx;
+ }
+ while (sect_to_write) {
+ struct bio *wbio;
+ if (sectors > sect_to_write)
+ sectors = sect_to_write;
+ /* Write at 'sector' for 'sectors'*/
+
+ wbio = bio_alloc_mddev(GFP_NOIO, vcnt, mddev);
+ memcpy(wbio->bi_io_vec, vec, vcnt * sizeof(struct bio_vec));
+ wbio->bi_sector = r1_bio->sector;
+ wbio->bi_rw = WRITE;
+ wbio->bi_vcnt = vcnt;
+ wbio->bi_size = r1_bio->sectors << 9;
+ wbio->bi_idx = idx;
+
+ md_trim_bio(wbio, sector - r1_bio->sector, sectors);
+ wbio->bi_sector += rdev->data_offset;
+ wbio->bi_bdev = rdev->bdev;
+ if (submit_bio_wait(WRITE, wbio) == 0)
+ /* failure! */
+ ok = rdev_set_badblocks(rdev, sector,
+ sectors, 0)
+ && ok;
+
+ bio_put(wbio);
+ sect_to_write -= sectors;
+ sector += sectors;
+ sectors = block_sectors;
+ }
+ return ok;
+}
+
+static void handle_sync_write_finished(conf_t *conf, r1bio_t *r1_bio)
+{
+ int m;
+ int s = r1_bio->sectors;
+ for (m = 0; m < conf->raid_disks ; m++) {
+ mdk_rdev_t *rdev = conf->mirrors[m].rdev;
+ struct bio *bio = r1_bio->bios[m];
+ if (bio->bi_end_io == NULL)
+ continue;
+ if (test_bit(BIO_UPTODATE, &bio->bi_flags) &&
+ test_bit(R1BIO_MadeGood, &r1_bio->state)) {
+ rdev_clear_badblocks(rdev, r1_bio->sector, s);
+ }
+ if (!test_bit(BIO_UPTODATE, &bio->bi_flags) &&
+ test_bit(R1BIO_WriteError, &r1_bio->state)) {
+ if (!rdev_set_badblocks(rdev, r1_bio->sector, s, 0))
+ md_error(conf->mddev, rdev);
+ }
+ }
+ put_buf(r1_bio);
+ md_done_sync(conf->mddev, s, 1);
+}
+
+static void handle_write_finished(conf_t *conf, r1bio_t *r1_bio)
+{
+ int m;
+ for (m = 0; m < conf->raid_disks ; m++)
+ if (r1_bio->bios[m] == IO_MADE_GOOD) {
+ mdk_rdev_t *rdev = conf->mirrors[m].rdev;
+ rdev_clear_badblocks(rdev,
+ r1_bio->sector,
+ r1_bio->sectors);
+ rdev_dec_pending(rdev, conf->mddev);
+ } else if (r1_bio->bios[m] != NULL) {
+ /* This drive got a write error. We need to
+ * narrow down and record precise write
+ * errors.
+ */
+ if (!narrow_write_error(r1_bio, m)) {
+ md_error(conf->mddev,
+ conf->mirrors[m].rdev);
+ /* an I/O failed, we can't clear the bitmap */
+ set_bit(R1BIO_Degraded, &r1_bio->state);
+ }
+ rdev_dec_pending(conf->mirrors[m].rdev,
+ conf->mddev);
+ }
+ if (test_bit(R1BIO_WriteError, &r1_bio->state))
+ close_write(r1_bio);
+ raid_end_bio_io(r1_bio);
+}
+
+static void handle_read_error(conf_t *conf, r1bio_t *r1_bio)
+{
+ int disk;
+ int max_sectors;
+ mddev_t *mddev = conf->mddev;
+ struct bio *bio;
+ char b[BDEVNAME_SIZE];
+ mdk_rdev_t *rdev;
+
+ clear_bit(R1BIO_ReadError, &r1_bio->state);
+ /* we got a read error. Maybe the drive is bad. Maybe just
+ * the block and we can fix it.
+ * We freeze all other IO, and try reading the block from
+ * other devices. When we find one, we re-write
+ * and check it that fixes the read error.
+ * This is all done synchronously while the array is
+ * frozen
+ */
+ if (mddev->ro == 0) {
+ freeze_array(conf);
+ fix_read_error(conf, r1_bio->read_disk,
+ r1_bio->sector, r1_bio->sectors);
+ unfreeze_array(conf);
+ } else
+ md_error(mddev, conf->mirrors[r1_bio->read_disk].rdev);
+
+ bio = r1_bio->bios[r1_bio->read_disk];
+ bdevname(bio->bi_bdev, b);
+read_more:
+ disk = read_balance(conf, r1_bio, &max_sectors);
+ if (disk == -1) {
+ printk(KERN_ALERT "md/raid1:%s: %s: unrecoverable I/O"
+ " read error for block %llu\n",
+ mdname(mddev), b, (unsigned long long)r1_bio->sector);
+ raid_end_bio_io(r1_bio);
+ } else {
+ const unsigned long do_sync
+ = r1_bio->master_bio->bi_rw & REQ_SYNC;
+ if (bio) {
+ r1_bio->bios[r1_bio->read_disk] =
+ mddev->ro ? IO_BLOCKED : NULL;
+ bio_put(bio);
+ }
+ r1_bio->read_disk = disk;
+ bio = bio_clone_mddev(r1_bio->master_bio, GFP_NOIO, mddev);
+ md_trim_bio(bio, r1_bio->sector - bio->bi_sector, max_sectors);
+ r1_bio->bios[r1_bio->read_disk] = bio;
+ rdev = conf->mirrors[disk].rdev;
+ printk_ratelimited(KERN_ERR
+ "md/raid1:%s: redirecting sector %llu"
+ " to other mirror: %s\n",
+ mdname(mddev),
+ (unsigned long long)r1_bio->sector,
+ bdevname(rdev->bdev, b));
+ bio->bi_sector = r1_bio->sector + rdev->data_offset;
+ bio->bi_bdev = rdev->bdev;
+ bio->bi_end_io = raid1_end_read_request;
+ bio->bi_rw = READ | do_sync;
+ bio->bi_private = r1_bio;
+ if (max_sectors < r1_bio->sectors) {
+ /* Drat - have to split this up more */
+ struct bio *mbio = r1_bio->master_bio;
+ int sectors_handled = (r1_bio->sector + max_sectors
+ - mbio->bi_sector);
+ r1_bio->sectors = max_sectors;
+ spin_lock_irq(&conf->device_lock);
+ if (mbio->bi_phys_segments == 0)
+ mbio->bi_phys_segments = 2;
+ else
+ mbio->bi_phys_segments++;
+ spin_unlock_irq(&conf->device_lock);
+ generic_make_request(bio);
+ bio = NULL;
+
+ r1_bio = mempool_alloc(conf->r1bio_pool, GFP_NOIO);
+
+ r1_bio->master_bio = mbio;
+ r1_bio->sectors = (mbio->bi_size >> 9)
+ - sectors_handled;
+ r1_bio->state = 0;
+ set_bit(R1BIO_ReadError, &r1_bio->state);
+ r1_bio->mddev = mddev;
+ r1_bio->sector = mbio->bi_sector + sectors_handled;
+
+ goto read_more;
+ } else
+ generic_make_request(bio);
+ }
+}
+
static void raid1d(mddev_t *mddev)
{
r1bio_t *r1_bio;
- struct bio *bio;
unsigned long flags;
conf_t *conf = mddev->private;
struct list_head *head = &conf->retry_list;
- mdk_rdev_t *rdev;
struct blk_plug plug;
md_check_recovery(mddev);
blk_start_plug(&plug);
for (;;) {
- char b[BDEVNAME_SIZE];
if (atomic_read(&mddev->plug_cnt) == 0)
flush_pending_writes(conf);
mddev = r1_bio->mddev;
conf = mddev->private;
- if (test_bit(R1BIO_IsSync, &r1_bio->state))
- sync_request_write(mddev, r1_bio);
- else {
- int disk;
-
- /* we got a read error. Maybe the drive is bad. Maybe just
- * the block and we can fix it.
- * We freeze all other IO, and try reading the block from
- * other devices. When we find one, we re-write
- * and check it that fixes the read error.
- * This is all done synchronously while the array is
- * frozen
+ if (test_bit(R1BIO_IsSync, &r1_bio->state)) {
+ if (test_bit(R1BIO_MadeGood, &r1_bio->state) ||
+ test_bit(R1BIO_WriteError, &r1_bio->state))
+ handle_sync_write_finished(conf, r1_bio);
+ else
+ sync_request_write(mddev, r1_bio);
+ } else if (test_bit(R1BIO_MadeGood, &r1_bio->state) ||
+ test_bit(R1BIO_WriteError, &r1_bio->state))
+ handle_write_finished(conf, r1_bio);
+ else if (test_bit(R1BIO_ReadError, &r1_bio->state))
+ handle_read_error(conf, r1_bio);
+ else
+ /* just a partial read to be scheduled from separate
+ * context
*/
- if (mddev->ro == 0) {
- freeze_array(conf);
- fix_read_error(conf, r1_bio->read_disk,
- r1_bio->sector,
- r1_bio->sectors);
- unfreeze_array(conf);
- } else
- md_error(mddev,
- conf->mirrors[r1_bio->read_disk].rdev);
-
- bio = r1_bio->bios[r1_bio->read_disk];
- if ((disk=read_balance(conf, r1_bio)) == -1) {
- printk(KERN_ALERT "md/raid1:%s: %s: unrecoverable I/O"
- " read error for block %llu\n",
- mdname(mddev),
- bdevname(bio->bi_bdev,b),
- (unsigned long long)r1_bio->sector);
- raid_end_bio_io(r1_bio);
- } else {
- const unsigned long do_sync = r1_bio->master_bio->bi_rw & REQ_SYNC;
- r1_bio->bios[r1_bio->read_disk] =
- mddev->ro ? IO_BLOCKED : NULL;
- r1_bio->read_disk = disk;
- bio_put(bio);
- bio = bio_clone_mddev(r1_bio->master_bio,
- GFP_NOIO, mddev);
- r1_bio->bios[r1_bio->read_disk] = bio;
- rdev = conf->mirrors[disk].rdev;
- if (printk_ratelimit())
- printk(KERN_ERR "md/raid1:%s: redirecting sector %llu to"
- " other mirror: %s\n",
- mdname(mddev),
- (unsigned long long)r1_bio->sector,
- bdevname(rdev->bdev,b));
- bio->bi_sector = r1_bio->sector + rdev->data_offset;
- bio->bi_bdev = rdev->bdev;
- bio->bi_end_io = raid1_end_read_request;
- bio->bi_rw = READ | do_sync;
- bio->bi_private = r1_bio;
- generic_make_request(bio);
- }
- }
+ generic_make_request(r1_bio->bios[r1_bio->read_disk]);
+
cond_resched();
+ if (mddev->flags & ~(1<<MD_CHANGE_PENDING))
+ md_check_recovery(mddev);
}
blk_finish_plug(&plug);
}
int write_targets = 0, read_targets = 0;
sector_t sync_blocks;
int still_degraded = 0;
+ int good_sectors = RESYNC_SECTORS;
+ int min_bad = 0; /* number of sectors that are bad in all devices */
if (!conf->r1buf_pool)
if (init_resync(conf))
rdev = rcu_dereference(conf->mirrors[i].rdev);
if (rdev == NULL ||
- test_bit(Faulty, &rdev->flags)) {
+ test_bit(Faulty, &rdev->flags)) {
still_degraded = 1;
- continue;
} else if (!test_bit(In_sync, &rdev->flags)) {
bio->bi_rw = WRITE;
bio->bi_end_io = end_sync_write;
write_targets ++;
} else {
/* may need to read from here */
- bio->bi_rw = READ;
- bio->bi_end_io = end_sync_read;
- if (test_bit(WriteMostly, &rdev->flags)) {
- if (wonly < 0)
- wonly = i;
- } else {
- if (disk < 0)
- disk = i;
+ sector_t first_bad = MaxSector;
+ int bad_sectors;
+
+ if (is_badblock(rdev, sector_nr, good_sectors,
+ &first_bad, &bad_sectors)) {
+ if (first_bad > sector_nr)
+ good_sectors = first_bad - sector_nr;
+ else {
+ bad_sectors -= (sector_nr - first_bad);
+ if (min_bad == 0 ||
+ min_bad > bad_sectors)
+ min_bad = bad_sectors;
+ }
+ }
+ if (sector_nr < first_bad) {
+ if (test_bit(WriteMostly, &rdev->flags)) {
+ if (wonly < 0)
+ wonly = i;
+ } else {
+ if (disk < 0)
+ disk = i;
+ }
+ bio->bi_rw = READ;
+ bio->bi_end_io = end_sync_read;
+ read_targets++;
}
- read_targets++;
}
- atomic_inc(&rdev->nr_pending);
- bio->bi_sector = sector_nr + rdev->data_offset;
- bio->bi_bdev = rdev->bdev;
- bio->bi_private = r1_bio;
+ if (bio->bi_end_io) {
+ atomic_inc(&rdev->nr_pending);
+ bio->bi_sector = sector_nr + rdev->data_offset;
+ bio->bi_bdev = rdev->bdev;
+ bio->bi_private = r1_bio;
+ }
}
rcu_read_unlock();
if (disk < 0)
disk = wonly;
r1_bio->read_disk = disk;
+ if (read_targets == 0 && min_bad > 0) {
+ /* These sectors are bad on all InSync devices, so we
+ * need to mark them bad on all write targets
+ */
+ int ok = 1;
+ for (i = 0 ; i < conf->raid_disks ; i++)
+ if (r1_bio->bios[i]->bi_end_io == end_sync_write) {
+ mdk_rdev_t *rdev =
+ rcu_dereference(conf->mirrors[i].rdev);
+ ok = rdev_set_badblocks(rdev, sector_nr,
+ min_bad, 0
+ ) && ok;
+ }
+ set_bit(MD_CHANGE_DEVS, &mddev->flags);
+ *skipped = 1;
+ put_buf(r1_bio);
+
+ if (!ok) {
+ /* Cannot record the badblocks, so need to
+ * abort the resync.
+ * If there are multiple read targets, could just
+ * fail the really bad ones ???
+ */
+ conf->recovery_disabled = mddev->recovery_disabled;
+ set_bit(MD_RECOVERY_INTR, &mddev->recovery);
+ return 0;
+ } else
+ return min_bad;
+
+ }
+ if (min_bad > 0 && min_bad < good_sectors) {
+ /* only resync enough to reach the next bad->good
+ * transition */
+ good_sectors = min_bad;
+ }
+
if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && read_targets > 0)
/* extra read targets are also write targets */
write_targets += read_targets-1;
if (max_sector > mddev->resync_max)
max_sector = mddev->resync_max; /* Don't do IO beyond here */
+ if (max_sector > sector_nr + good_sectors)
+ max_sector = sector_nr + good_sectors;
nr_sectors = 0;
sync_blocks = 0;
do {
for (d = d2 = 0; d < conf->raid_disks; d++) {
mdk_rdev_t *rdev = conf->mirrors[d].rdev;
if (rdev && rdev->raid_disk != d2) {
- char nm[20];
- sprintf(nm, "rd%d", rdev->raid_disk);
- sysfs_remove_link(&mddev->kobj, nm);
+ sysfs_unlink_rdev(mddev, rdev);
rdev->raid_disk = d2;
- sprintf(nm, "rd%d", rdev->raid_disk);
- sysfs_remove_link(&mddev->kobj, nm);
- if (sysfs_create_link(&mddev->kobj,
- &rdev->kobj, nm))
+ sysfs_unlink_rdev(mddev, rdev);
+ if (sysfs_link_rdev(mddev, rdev))
printk(KERN_WARNING
- "md/raid1:%s: cannot register "
- "%s\n",
- mdname(mddev), nm);
+ "md/raid1:%s: cannot register rd%d\n",
+ mdname(mddev), rdev->raid_disk);
}
if (rdev)
newmirrors[d2++].rdev = rdev;
* (fresh device added).
* Cleared when a sync completes.
*/
+ int recovery_disabled; /* when the same as
+ * mddev->recovery_disabled
+ * we don't allow recovery
+ * to be attempted as we
+ * expect a read error
+ */
wait_queue_head_t wait_barrier;
struct list_head retry_list;
/* Next two are only valid when R1BIO_BehindIO is set */
- struct page **behind_pages;
+ struct bio_vec *behind_bvecs;
int behind_page_count;
/*
* if the IO is in WRITE direction, then multiple bios are used.
* correct the read error. To keep track of bad blocks on a per-bio
* level, we store IO_BLOCKED in the appropriate 'bios' pointer
*/
-#define IO_BLOCKED ((struct bio*)1)
+#define IO_BLOCKED ((struct bio *)1)
+/* When we successfully write to a known bad-block, we need to remove the
+ * bad-block marking which must be done from process context. So we record
+ * the success by setting bios[n] to IO_MADE_GOOD
+ */
+#define IO_MADE_GOOD ((struct bio *)2)
+
+#define BIO_SPECIAL(bio) ((unsigned long)bio <= 2)
/* bits for r1bio.state */
#define R1BIO_Uptodate 0
#define R1BIO_IsSync 1
#define R1BIO_Degraded 2
#define R1BIO_BehindIO 3
+/* Set ReadError on bios that experience a readerror so that
+ * raid1d knows what to do with them.
+ */
+#define R1BIO_ReadError 4
/* For write-behind requests, we call bi_end_io when
* the last non-write-behind device completes, providing
* any write was successful. Otherwise we call when
* Record that bi_end_io was called with this flag...
*/
#define R1BIO_Returned 6
+/* If a write for this request means we can clear some
+ * known-bad-block records, we set this flag
+ */
+#define R1BIO_MadeGood 7
+#define R1BIO_WriteError 8
extern int md_raid1_congested(mddev_t *mddev, int bits);
#include <linux/delay.h>
#include <linux/blkdev.h>
#include <linux/seq_file.h>
+#include <linux/ratelimit.h>
#include "md.h"
#include "raid10.h"
#include "raid0.h"
for (j = 0 ; j < nalloc; j++) {
bio = r10_bio->devs[j].bio;
for (i = 0; i < RESYNC_PAGES; i++) {
- page = alloc_page(gfp_flags);
+ if (j == 1 && !test_bit(MD_RECOVERY_SYNC,
+ &conf->mddev->recovery)) {
+ /* we can share bv_page's during recovery */
+ struct bio *rbio = r10_bio->devs[0].bio;
+ page = rbio->bi_io_vec[i].bv_page;
+ get_page(page);
+ } else
+ page = alloc_page(gfp_flags);
if (unlikely(!page))
goto out_free_pages;
for (i = 0; i < conf->copies; i++) {
struct bio **bio = & r10_bio->devs[i].bio;
- if (*bio && *bio != IO_BLOCKED)
+ if (!BIO_SPECIAL(*bio))
bio_put(*bio);
*bio = NULL;
}
{
conf_t *conf = r10_bio->mddev->private;
- /*
- * Wake up any possible resync thread that waits for the device
- * to go idle.
- */
- allow_barrier(conf);
-
put_all_bios(conf, r10_bio);
mempool_free(r10_bio, conf->r10bio_pool);
}
static void raid_end_bio_io(r10bio_t *r10_bio)
{
struct bio *bio = r10_bio->master_bio;
+ int done;
+ conf_t *conf = r10_bio->mddev->private;
- bio_endio(bio,
- test_bit(R10BIO_Uptodate, &r10_bio->state) ? 0 : -EIO);
+ if (bio->bi_phys_segments) {
+ unsigned long flags;
+ spin_lock_irqsave(&conf->device_lock, flags);
+ bio->bi_phys_segments--;
+ done = (bio->bi_phys_segments == 0);
+ spin_unlock_irqrestore(&conf->device_lock, flags);
+ } else
+ done = 1;
+ if (!test_bit(R10BIO_Uptodate, &r10_bio->state))
+ clear_bit(BIO_UPTODATE, &bio->bi_flags);
+ if (done) {
+ bio_endio(bio, 0);
+ /*
+ * Wake up any possible resync thread that waits for the device
+ * to go idle.
+ */
+ allow_barrier(conf);
+ }
free_r10bio(r10_bio);
}
r10_bio->devs[slot].addr + (r10_bio->sectors);
}
+/*
+ * Find the disk number which triggered given bio
+ */
+static int find_bio_disk(conf_t *conf, r10bio_t *r10_bio,
+ struct bio *bio, int *slotp)
+{
+ int slot;
+
+ for (slot = 0; slot < conf->copies; slot++)
+ if (r10_bio->devs[slot].bio == bio)
+ break;
+
+ BUG_ON(slot == conf->copies);
+ update_head_pos(slot, r10_bio);
+
+ if (slotp)
+ *slotp = slot;
+ return r10_bio->devs[slot].devnum;
+}
+
static void raid10_end_read_request(struct bio *bio, int error)
{
int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
* oops, read error - keep the refcount on the rdev
*/
char b[BDEVNAME_SIZE];
- if (printk_ratelimit())
- printk(KERN_ERR "md/raid10:%s: %s: rescheduling sector %llu\n",
- mdname(conf->mddev),
- bdevname(conf->mirrors[dev].rdev->bdev,b), (unsigned long long)r10_bio->sector);
+ printk_ratelimited(KERN_ERR
+ "md/raid10:%s: %s: rescheduling sector %llu\n",
+ mdname(conf->mddev),
+ bdevname(conf->mirrors[dev].rdev->bdev, b),
+ (unsigned long long)r10_bio->sector);
+ set_bit(R10BIO_ReadError, &r10_bio->state);
reschedule_retry(r10_bio);
}
}
+static void close_write(r10bio_t *r10_bio)
+{
+ /* clear the bitmap if all writes complete successfully */
+ bitmap_endwrite(r10_bio->mddev->bitmap, r10_bio->sector,
+ r10_bio->sectors,
+ !test_bit(R10BIO_Degraded, &r10_bio->state),
+ 0);
+ md_write_end(r10_bio->mddev);
+}
+
static void raid10_end_write_request(struct bio *bio, int error)
{
int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
r10bio_t *r10_bio = bio->bi_private;
- int slot, dev;
+ int dev;
+ int dec_rdev = 1;
conf_t *conf = r10_bio->mddev->private;
+ int slot;
- for (slot = 0; slot < conf->copies; slot++)
- if (r10_bio->devs[slot].bio == bio)
- break;
- dev = r10_bio->devs[slot].devnum;
+ dev = find_bio_disk(conf, r10_bio, bio, &slot);
/*
* this branch is our 'one mirror IO has finished' event handler:
*/
if (!uptodate) {
- md_error(r10_bio->mddev, conf->mirrors[dev].rdev);
- /* an I/O failed, we can't clear the bitmap */
- set_bit(R10BIO_Degraded, &r10_bio->state);
- } else
+ set_bit(WriteErrorSeen, &conf->mirrors[dev].rdev->flags);
+ set_bit(R10BIO_WriteError, &r10_bio->state);
+ dec_rdev = 0;
+ } else {
/*
* Set R10BIO_Uptodate in our master bio, so that
* we will return a good error code for to the higher
* user-side. So if something waits for IO, then it will
* wait for the 'master' bio.
*/
+ sector_t first_bad;
+ int bad_sectors;
+
set_bit(R10BIO_Uptodate, &r10_bio->state);
- update_head_pos(slot, r10_bio);
+ /* Maybe we can clear some bad blocks. */
+ if (is_badblock(conf->mirrors[dev].rdev,
+ r10_bio->devs[slot].addr,
+ r10_bio->sectors,
+ &first_bad, &bad_sectors)) {
+ bio_put(bio);
+ r10_bio->devs[slot].bio = IO_MADE_GOOD;
+ dec_rdev = 0;
+ set_bit(R10BIO_MadeGood, &r10_bio->state);
+ }
+ }
/*
*
* already.
*/
if (atomic_dec_and_test(&r10_bio->remaining)) {
- /* clear the bitmap if all writes complete successfully */
- bitmap_endwrite(r10_bio->mddev->bitmap, r10_bio->sector,
- r10_bio->sectors,
- !test_bit(R10BIO_Degraded, &r10_bio->state),
- 0);
- md_write_end(r10_bio->mddev);
- raid_end_bio_io(r10_bio);
+ if (test_bit(R10BIO_WriteError, &r10_bio->state))
+ reschedule_retry(r10_bio);
+ else {
+ close_write(r10_bio);
+ if (test_bit(R10BIO_MadeGood, &r10_bio->state))
+ reschedule_retry(r10_bio);
+ else
+ raid_end_bio_io(r10_bio);
+ }
}
-
- rdev_dec_pending(conf->mirrors[dev].rdev, conf->mddev);
+ if (dec_rdev)
+ rdev_dec_pending(conf->mirrors[dev].rdev, conf->mddev);
}
* FIXME: possibly should rethink readbalancing and do it differently
* depending on near_copies / far_copies geometry.
*/
-static int read_balance(conf_t *conf, r10bio_t *r10_bio)
+static int read_balance(conf_t *conf, r10bio_t *r10_bio, int *max_sectors)
{
const sector_t this_sector = r10_bio->sector;
int disk, slot;
- const int sectors = r10_bio->sectors;
+ int sectors = r10_bio->sectors;
+ int best_good_sectors;
sector_t new_distance, best_dist;
mdk_rdev_t *rdev;
int do_balance;
raid10_find_phys(conf, r10_bio);
rcu_read_lock();
retry:
+ sectors = r10_bio->sectors;
best_slot = -1;
best_dist = MaxSector;
+ best_good_sectors = 0;
do_balance = 1;
/*
* Check if we can balance. We can balance on the whole
do_balance = 0;
for (slot = 0; slot < conf->copies ; slot++) {
+ sector_t first_bad;
+ int bad_sectors;
+ sector_t dev_sector;
+
if (r10_bio->devs[slot].bio == IO_BLOCKED)
continue;
disk = r10_bio->devs[slot].devnum;
if (!test_bit(In_sync, &rdev->flags))
continue;
+ dev_sector = r10_bio->devs[slot].addr;
+ if (is_badblock(rdev, dev_sector, sectors,
+ &first_bad, &bad_sectors)) {
+ if (best_dist < MaxSector)
+ /* Already have a better slot */
+ continue;
+ if (first_bad <= dev_sector) {
+ /* Cannot read here. If this is the
+ * 'primary' device, then we must not read
+ * beyond 'bad_sectors' from another device.
+ */
+ bad_sectors -= (dev_sector - first_bad);
+ if (!do_balance && sectors > bad_sectors)
+ sectors = bad_sectors;
+ if (best_good_sectors > sectors)
+ best_good_sectors = sectors;
+ } else {
+ sector_t good_sectors =
+ first_bad - dev_sector;
+ if (good_sectors > best_good_sectors) {
+ best_good_sectors = good_sectors;
+ best_slot = slot;
+ }
+ if (!do_balance)
+ /* Must read from here */
+ break;
+ }
+ continue;
+ } else
+ best_good_sectors = sectors;
+
if (!do_balance)
break;
} else
disk = -1;
rcu_read_unlock();
+ *max_sectors = best_good_sectors;
return disk;
}
unsigned long flags;
mdk_rdev_t *blocked_rdev;
int plugged;
+ int sectors_handled;
+ int max_sectors;
if (unlikely(bio->bi_rw & REQ_FLUSH)) {
md_flush_request(mddev, bio);
r10_bio->sector = bio->bi_sector;
r10_bio->state = 0;
+ /* We might need to issue multiple reads to different
+ * devices if there are bad blocks around, so we keep
+ * track of the number of reads in bio->bi_phys_segments.
+ * If this is 0, there is only one r10_bio and no locking
+ * will be needed when the request completes. If it is
+ * non-zero, then it is the number of not-completed requests.
+ */
+ bio->bi_phys_segments = 0;
+ clear_bit(BIO_SEG_VALID, &bio->bi_flags);
+
if (rw == READ) {
/*
* read balancing logic:
*/
- int disk = read_balance(conf, r10_bio);
- int slot = r10_bio->read_slot;
+ int disk;
+ int slot;
+
+read_again:
+ disk = read_balance(conf, r10_bio, &max_sectors);
+ slot = r10_bio->read_slot;
if (disk < 0) {
raid_end_bio_io(r10_bio);
return 0;
mirror = conf->mirrors + disk;
read_bio = bio_clone_mddev(bio, GFP_NOIO, mddev);
+ md_trim_bio(read_bio, r10_bio->sector - bio->bi_sector,
+ max_sectors);
r10_bio->devs[slot].bio = read_bio;
read_bio->bi_rw = READ | do_sync;
read_bio->bi_private = r10_bio;
- generic_make_request(read_bio);
+ if (max_sectors < r10_bio->sectors) {
+ /* Could not read all from this device, so we will
+ * need another r10_bio.
+ */
+ sectors_handled = (r10_bio->sectors + max_sectors
+ - bio->bi_sector);
+ r10_bio->sectors = max_sectors;
+ spin_lock_irq(&conf->device_lock);
+ if (bio->bi_phys_segments == 0)
+ bio->bi_phys_segments = 2;
+ else
+ bio->bi_phys_segments++;
+ spin_unlock(&conf->device_lock);
+ /* Cannot call generic_make_request directly
+ * as that will be queued in __generic_make_request
+ * and subsequent mempool_alloc might block
+ * waiting for it. so hand bio over to raid10d.
+ */
+ reschedule_retry(r10_bio);
+
+ r10_bio = mempool_alloc(conf->r10bio_pool, GFP_NOIO);
+
+ r10_bio->master_bio = bio;
+ r10_bio->sectors = ((bio->bi_size >> 9)
+ - sectors_handled);
+ r10_bio->state = 0;
+ r10_bio->mddev = mddev;
+ r10_bio->sector = bio->bi_sector + sectors_handled;
+ goto read_again;
+ } else
+ generic_make_request(read_bio);
return 0;
}
/* first select target devices under rcu_lock and
* inc refcount on their rdev. Record them by setting
* bios[x] to bio
+ * If there are known/acknowledged bad blocks on any device
+ * on which we have seen a write error, we want to avoid
+ * writing to those blocks. This potentially requires several
+ * writes to write around the bad blocks. Each set of writes
+ * gets its own r10_bio with a set of bios attached. The number
+ * of r10_bios is recored in bio->bi_phys_segments just as with
+ * the read case.
*/
plugged = mddev_check_plugged(mddev);
raid10_find_phys(conf, r10_bio);
- retry_write:
+retry_write:
blocked_rdev = NULL;
rcu_read_lock();
+ max_sectors = r10_bio->sectors;
+
for (i = 0; i < conf->copies; i++) {
int d = r10_bio->devs[i].devnum;
mdk_rdev_t *rdev = rcu_dereference(conf->mirrors[d].rdev);
blocked_rdev = rdev;
break;
}
- if (rdev && !test_bit(Faulty, &rdev->flags)) {
- atomic_inc(&rdev->nr_pending);
- r10_bio->devs[i].bio = bio;
- } else {
- r10_bio->devs[i].bio = NULL;
+ r10_bio->devs[i].bio = NULL;
+ if (!rdev || test_bit(Faulty, &rdev->flags)) {
set_bit(R10BIO_Degraded, &r10_bio->state);
+ continue;
}
+ if (test_bit(WriteErrorSeen, &rdev->flags)) {
+ sector_t first_bad;
+ sector_t dev_sector = r10_bio->devs[i].addr;
+ int bad_sectors;
+ int is_bad;
+
+ is_bad = is_badblock(rdev, dev_sector,
+ max_sectors,
+ &first_bad, &bad_sectors);
+ if (is_bad < 0) {
+ /* Mustn't write here until the bad block
+ * is acknowledged
+ */
+ atomic_inc(&rdev->nr_pending);
+ set_bit(BlockedBadBlocks, &rdev->flags);
+ blocked_rdev = rdev;
+ break;
+ }
+ if (is_bad && first_bad <= dev_sector) {
+ /* Cannot write here at all */
+ bad_sectors -= (dev_sector - first_bad);
+ if (bad_sectors < max_sectors)
+ /* Mustn't write more than bad_sectors
+ * to other devices yet
+ */
+ max_sectors = bad_sectors;
+ /* We don't set R10BIO_Degraded as that
+ * only applies if the disk is missing,
+ * so it might be re-added, and we want to
+ * know to recover this chunk.
+ * In this case the device is here, and the
+ * fact that this chunk is not in-sync is
+ * recorded in the bad block log.
+ */
+ continue;
+ }
+ if (is_bad) {
+ int good_sectors = first_bad - dev_sector;
+ if (good_sectors < max_sectors)
+ max_sectors = good_sectors;
+ }
+ }
+ r10_bio->devs[i].bio = bio;
+ atomic_inc(&rdev->nr_pending);
}
rcu_read_unlock();
goto retry_write;
}
+ if (max_sectors < r10_bio->sectors) {
+ /* We are splitting this into multiple parts, so
+ * we need to prepare for allocating another r10_bio.
+ */
+ r10_bio->sectors = max_sectors;
+ spin_lock_irq(&conf->device_lock);
+ if (bio->bi_phys_segments == 0)
+ bio->bi_phys_segments = 2;
+ else
+ bio->bi_phys_segments++;
+ spin_unlock_irq(&conf->device_lock);
+ }
+ sectors_handled = r10_bio->sector + max_sectors - bio->bi_sector;
+
atomic_set(&r10_bio->remaining, 1);
- bitmap_startwrite(mddev->bitmap, bio->bi_sector, r10_bio->sectors, 0);
+ bitmap_startwrite(mddev->bitmap, r10_bio->sector, r10_bio->sectors, 0);
for (i = 0; i < conf->copies; i++) {
struct bio *mbio;
continue;
mbio = bio_clone_mddev(bio, GFP_NOIO, mddev);
+ md_trim_bio(mbio, r10_bio->sector - bio->bi_sector,
+ max_sectors);
r10_bio->devs[i].bio = mbio;
- mbio->bi_sector = r10_bio->devs[i].addr+
- conf->mirrors[d].rdev->data_offset;
+ mbio->bi_sector = (r10_bio->devs[i].addr+
+ conf->mirrors[d].rdev->data_offset);
mbio->bi_bdev = conf->mirrors[d].rdev->bdev;
mbio->bi_end_io = raid10_end_write_request;
mbio->bi_rw = WRITE | do_sync | do_fua;
/* In case raid10d snuck in to freeze_array */
wake_up(&conf->wait_barrier);
+ if (sectors_handled < (bio->bi_size >> 9)) {
+ /* We need another r10_bio. It has already been counted
+ * in bio->bi_phys_segments.
+ */
+ r10_bio = mempool_alloc(conf->r10bio_pool, GFP_NOIO);
+
+ r10_bio->master_bio = bio;
+ r10_bio->sectors = (bio->bi_size >> 9) - sectors_handled;
+
+ r10_bio->mddev = mddev;
+ r10_bio->sector = bio->bi_sector + sectors_handled;
+ r10_bio->state = 0;
+ goto retry_write;
+ }
+
if (do_sync || !mddev->bitmap || !plugged)
md_wakeup_thread(mddev->thread);
return 0;
seq_printf(seq, "]");
}
+/* check if there are enough drives for
+ * every block to appear on atleast one.
+ * Don't consider the device numbered 'ignore'
+ * as we might be about to remove it.
+ */
+static int enough(conf_t *conf, int ignore)
+{
+ int first = 0;
+
+ do {
+ int n = conf->copies;
+ int cnt = 0;
+ while (n--) {
+ if (conf->mirrors[first].rdev &&
+ first != ignore)
+ cnt++;
+ first = (first+1) % conf->raid_disks;
+ }
+ if (cnt == 0)
+ return 0;
+ } while (first != 0);
+ return 1;
+}
+
static void error(mddev_t *mddev, mdk_rdev_t *rdev)
{
char b[BDEVNAME_SIZE];
* else mark the drive as failed
*/
if (test_bit(In_sync, &rdev->flags)
- && conf->raid_disks-mddev->degraded == 1)
+ && !enough(conf, rdev->raid_disk))
/*
* Don't fail the drive, just return an IO error.
- * The test should really be more sophisticated than
- * "working_disks == 1", but it isn't critical, and
- * can wait until we do more sophisticated "is the drive
- * really dead" tests...
*/
return;
if (test_and_clear_bit(In_sync, &rdev->flags)) {
*/
set_bit(MD_RECOVERY_INTR, &mddev->recovery);
}
+ set_bit(Blocked, &rdev->flags);
set_bit(Faulty, &rdev->flags);
set_bit(MD_CHANGE_DEVS, &mddev->flags);
printk(KERN_ALERT
conf->r10buf_pool = NULL;
}
-/* check if there are enough drives for
- * every block to appear on atleast one
- */
-static int enough(conf_t *conf)
-{
- int first = 0;
-
- do {
- int n = conf->copies;
- int cnt = 0;
- while (n--) {
- if (conf->mirrors[first].rdev)
- cnt++;
- first = (first+1) % conf->raid_disks;
- }
- if (cnt == 0)
- return 0;
- } while (first != 0);
- return 1;
-}
-
static int raid10_spare_active(mddev_t *mddev)
{
int i;
conf_t *conf = mddev->private;
int err = -EEXIST;
int mirror;
- mirror_info_t *p;
int first = 0;
int last = conf->raid_disks - 1;
* very different from resync
*/
return -EBUSY;
- if (!enough(conf))
+ if (!enough(conf, -1))
return -EINVAL;
if (rdev->raid_disk >= 0)
first = last = rdev->raid_disk;
- if (rdev->saved_raid_disk >= 0 &&
- rdev->saved_raid_disk >= first &&
+ if (rdev->saved_raid_disk >= first &&
conf->mirrors[rdev->saved_raid_disk].rdev == NULL)
mirror = rdev->saved_raid_disk;
else
mirror = first;
- for ( ; mirror <= last ; mirror++)
- if ( !(p=conf->mirrors+mirror)->rdev) {
-
- disk_stack_limits(mddev->gendisk, rdev->bdev,
- rdev->data_offset << 9);
- /* as we don't honour merge_bvec_fn, we must
- * never risk violating it, so limit
- * ->max_segments to one lying with a single
- * page, as a one page request is never in
- * violation.
- */
- if (rdev->bdev->bd_disk->queue->merge_bvec_fn) {
- blk_queue_max_segments(mddev->queue, 1);
- blk_queue_segment_boundary(mddev->queue,
- PAGE_CACHE_SIZE - 1);
- }
+ for ( ; mirror <= last ; mirror++) {
+ mirror_info_t *p = &conf->mirrors[mirror];
+ if (p->recovery_disabled == mddev->recovery_disabled)
+ continue;
+ if (!p->rdev)
+ continue;
- p->head_position = 0;
- rdev->raid_disk = mirror;
- err = 0;
- if (rdev->saved_raid_disk != mirror)
- conf->fullsync = 1;
- rcu_assign_pointer(p->rdev, rdev);
- break;
+ disk_stack_limits(mddev->gendisk, rdev->bdev,
+ rdev->data_offset << 9);
+ /* as we don't honour merge_bvec_fn, we must
+ * never risk violating it, so limit
+ * ->max_segments to one lying with a single
+ * page, as a one page request is never in
+ * violation.
+ */
+ if (rdev->bdev->bd_disk->queue->merge_bvec_fn) {
+ blk_queue_max_segments(mddev->queue, 1);
+ blk_queue_segment_boundary(mddev->queue,
+ PAGE_CACHE_SIZE - 1);
}
+ p->head_position = 0;
+ rdev->raid_disk = mirror;
+ err = 0;
+ if (rdev->saved_raid_disk != mirror)
+ conf->fullsync = 1;
+ rcu_assign_pointer(p->rdev, rdev);
+ break;
+ }
+
md_integrity_add_rdev(rdev, mddev);
print_conf(conf);
return err;
* is not possible.
*/
if (!test_bit(Faulty, &rdev->flags) &&
- enough(conf)) {
+ mddev->recovery_disabled != p->recovery_disabled &&
+ enough(conf, -1)) {
err = -EBUSY;
goto abort;
}
{
r10bio_t *r10_bio = bio->bi_private;
conf_t *conf = r10_bio->mddev->private;
- int i,d;
+ int d;
- for (i=0; i<conf->copies; i++)
- if (r10_bio->devs[i].bio == bio)
- break;
- BUG_ON(i == conf->copies);
- update_head_pos(i, r10_bio);
- d = r10_bio->devs[i].devnum;
+ d = find_bio_disk(conf, r10_bio, bio, NULL);
if (test_bit(BIO_UPTODATE, &bio->bi_flags))
set_bit(R10BIO_Uptodate, &r10_bio->state);
- else {
+ else
+ /* The write handler will notice the lack of
+ * R10BIO_Uptodate and record any errors etc
+ */
atomic_add(r10_bio->sectors,
&conf->mirrors[d].rdev->corrected_errors);
- if (!test_bit(MD_RECOVERY_SYNC, &conf->mddev->recovery))
- md_error(r10_bio->mddev,
- conf->mirrors[d].rdev);
- }
/* for reconstruct, we always reschedule after a read.
* for resync, only after all reads
}
}
-static void end_sync_write(struct bio *bio, int error)
+static void end_sync_request(r10bio_t *r10_bio)
{
- int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
- r10bio_t *r10_bio = bio->bi_private;
mddev_t *mddev = r10_bio->mddev;
- conf_t *conf = mddev->private;
- int i,d;
-
- for (i = 0; i < conf->copies; i++)
- if (r10_bio->devs[i].bio == bio)
- break;
- d = r10_bio->devs[i].devnum;
- if (!uptodate)
- md_error(mddev, conf->mirrors[d].rdev);
-
- update_head_pos(i, r10_bio);
-
- rdev_dec_pending(conf->mirrors[d].rdev, mddev);
while (atomic_dec_and_test(&r10_bio->remaining)) {
if (r10_bio->master_bio == NULL) {
/* the primary of several recovery bios */
sector_t s = r10_bio->sectors;
- put_buf(r10_bio);
+ if (test_bit(R10BIO_MadeGood, &r10_bio->state) ||
+ test_bit(R10BIO_WriteError, &r10_bio->state))
+ reschedule_retry(r10_bio);
+ else
+ put_buf(r10_bio);
md_done_sync(mddev, s, 1);
break;
} else {
r10bio_t *r10_bio2 = (r10bio_t *)r10_bio->master_bio;
- put_buf(r10_bio);
+ if (test_bit(R10BIO_MadeGood, &r10_bio->state) ||
+ test_bit(R10BIO_WriteError, &r10_bio->state))
+ reschedule_retry(r10_bio);
+ else
+ put_buf(r10_bio);
r10_bio = r10_bio2;
}
}
}
+static void end_sync_write(struct bio *bio, int error)
+{
+ int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
+ r10bio_t *r10_bio = bio->bi_private;
+ mddev_t *mddev = r10_bio->mddev;
+ conf_t *conf = mddev->private;
+ int d;
+ sector_t first_bad;
+ int bad_sectors;
+ int slot;
+
+ d = find_bio_disk(conf, r10_bio, bio, &slot);
+
+ if (!uptodate) {
+ set_bit(WriteErrorSeen, &conf->mirrors[d].rdev->flags);
+ set_bit(R10BIO_WriteError, &r10_bio->state);
+ } else if (is_badblock(conf->mirrors[d].rdev,
+ r10_bio->devs[slot].addr,
+ r10_bio->sectors,
+ &first_bad, &bad_sectors))
+ set_bit(R10BIO_MadeGood, &r10_bio->state);
+
+ rdev_dec_pending(conf->mirrors[d].rdev, mddev);
+
+ end_sync_request(r10_bio);
+}
+
/*
* Note: sync and recover and handled very differently for raid10
* This code is for resync.
if (j == vcnt)
continue;
mddev->resync_mismatches += r10_bio->sectors;
+ if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
+ /* Don't fix anything. */
+ continue;
}
- if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
- /* Don't fix anything. */
- continue;
- /* Ok, we need to write this bio
+ /* Ok, we need to write this bio, either to correct an
+ * inconsistency or to correct an unreadable block.
* First we need to fixup bv_offset, bv_len and
* bi_vecs, as the read request might have corrupted these
*/
* The second for writing.
*
*/
+static void fix_recovery_read_error(r10bio_t *r10_bio)
+{
+ /* We got a read error during recovery.
+ * We repeat the read in smaller page-sized sections.
+ * If a read succeeds, write it to the new device or record
+ * a bad block if we cannot.
+ * If a read fails, record a bad block on both old and
+ * new devices.
+ */
+ mddev_t *mddev = r10_bio->mddev;
+ conf_t *conf = mddev->private;
+ struct bio *bio = r10_bio->devs[0].bio;
+ sector_t sect = 0;
+ int sectors = r10_bio->sectors;
+ int idx = 0;
+ int dr = r10_bio->devs[0].devnum;
+ int dw = r10_bio->devs[1].devnum;
+
+ while (sectors) {
+ int s = sectors;
+ mdk_rdev_t *rdev;
+ sector_t addr;
+ int ok;
+
+ if (s > (PAGE_SIZE>>9))
+ s = PAGE_SIZE >> 9;
+
+ rdev = conf->mirrors[dr].rdev;
+ addr = r10_bio->devs[0].addr + sect,
+ ok = sync_page_io(rdev,
+ addr,
+ s << 9,
+ bio->bi_io_vec[idx].bv_page,
+ READ, false);
+ if (ok) {
+ rdev = conf->mirrors[dw].rdev;
+ addr = r10_bio->devs[1].addr + sect;
+ ok = sync_page_io(rdev,
+ addr,
+ s << 9,
+ bio->bi_io_vec[idx].bv_page,
+ WRITE, false);
+ if (!ok)
+ set_bit(WriteErrorSeen, &rdev->flags);
+ }
+ if (!ok) {
+ /* We don't worry if we cannot set a bad block -
+ * it really is bad so there is no loss in not
+ * recording it yet
+ */
+ rdev_set_badblocks(rdev, addr, s, 0);
+
+ if (rdev != conf->mirrors[dw].rdev) {
+ /* need bad block on destination too */
+ mdk_rdev_t *rdev2 = conf->mirrors[dw].rdev;
+ addr = r10_bio->devs[1].addr + sect;
+ ok = rdev_set_badblocks(rdev2, addr, s, 0);
+ if (!ok) {
+ /* just abort the recovery */
+ printk(KERN_NOTICE
+ "md/raid10:%s: recovery aborted"
+ " due to read error\n",
+ mdname(mddev));
+
+ conf->mirrors[dw].recovery_disabled
+ = mddev->recovery_disabled;
+ set_bit(MD_RECOVERY_INTR,
+ &mddev->recovery);
+ break;
+ }
+ }
+ }
+
+ sectors -= s;
+ sect += s;
+ idx++;
+ }
+}
static void recovery_request_write(mddev_t *mddev, r10bio_t *r10_bio)
{
conf_t *conf = mddev->private;
- int i, d;
- struct bio *bio, *wbio;
+ int d;
+ struct bio *wbio;
+ if (!test_bit(R10BIO_Uptodate, &r10_bio->state)) {
+ fix_recovery_read_error(r10_bio);
+ end_sync_request(r10_bio);
+ return;
+ }
- /* move the pages across to the second bio
+ /*
+ * share the pages with the first bio
* and submit the write request
*/
- bio = r10_bio->devs[0].bio;
wbio = r10_bio->devs[1].bio;
- for (i=0; i < wbio->bi_vcnt; i++) {
- struct page *p = bio->bi_io_vec[i].bv_page;
- bio->bi_io_vec[i].bv_page = wbio->bi_io_vec[i].bv_page;
- wbio->bi_io_vec[i].bv_page = p;
- }
d = r10_bio->devs[1].devnum;
atomic_inc(&conf->mirrors[d].rdev->nr_pending);
md_sync_acct(conf->mirrors[d].rdev->bdev, wbio->bi_size >> 9);
- if (test_bit(R10BIO_Uptodate, &r10_bio->state))
- generic_make_request(wbio);
- else
- bio_endio(wbio, -EIO);
+ generic_make_request(wbio);
}
atomic_set(&rdev->read_errors, read_errors >> hours_since_last);
}
+static int r10_sync_page_io(mdk_rdev_t *rdev, sector_t sector,
+ int sectors, struct page *page, int rw)
+{
+ sector_t first_bad;
+ int bad_sectors;
+
+ if (is_badblock(rdev, sector, sectors, &first_bad, &bad_sectors)
+ && (rw == READ || test_bit(WriteErrorSeen, &rdev->flags)))
+ return -1;
+ if (sync_page_io(rdev, sector, sectors << 9, page, rw, false))
+ /* success */
+ return 1;
+ if (rw == WRITE)
+ set_bit(WriteErrorSeen, &rdev->flags);
+ /* need to record an error - either for the block or the device */
+ if (!rdev_set_badblocks(rdev, sector, sectors, 0))
+ md_error(rdev->mddev, rdev);
+ return 0;
+}
+
/*
* This is a kernel thread which:
*
rcu_read_lock();
do {
+ sector_t first_bad;
+ int bad_sectors;
+
d = r10_bio->devs[sl].devnum;
rdev = rcu_dereference(conf->mirrors[d].rdev);
if (rdev &&
- test_bit(In_sync, &rdev->flags)) {
+ test_bit(In_sync, &rdev->flags) &&
+ is_badblock(rdev, r10_bio->devs[sl].addr + sect, s,
+ &first_bad, &bad_sectors) == 0) {
atomic_inc(&rdev->nr_pending);
rcu_read_unlock();
success = sync_page_io(rdev,
rcu_read_unlock();
if (!success) {
- /* Cannot read from anywhere -- bye bye array */
+ /* Cannot read from anywhere, just mark the block
+ * as bad on the first device to discourage future
+ * reads.
+ */
int dn = r10_bio->devs[r10_bio->read_slot].devnum;
- md_error(mddev, conf->mirrors[dn].rdev);
+ rdev = conf->mirrors[dn].rdev;
+
+ if (!rdev_set_badblocks(
+ rdev,
+ r10_bio->devs[r10_bio->read_slot].addr
+ + sect,
+ s, 0))
+ md_error(mddev, rdev);
break;
}
sl--;
d = r10_bio->devs[sl].devnum;
rdev = rcu_dereference(conf->mirrors[d].rdev);
- if (rdev &&
- test_bit(In_sync, &rdev->flags)) {
- atomic_inc(&rdev->nr_pending);
- rcu_read_unlock();
- atomic_add(s, &rdev->corrected_errors);
- if (sync_page_io(rdev,
- r10_bio->devs[sl].addr +
- sect,
- s<<9, conf->tmppage, WRITE, false)
- == 0) {
- /* Well, this device is dead */
- printk(KERN_NOTICE
- "md/raid10:%s: read correction "
- "write failed"
- " (%d sectors at %llu on %s)\n",
- mdname(mddev), s,
- (unsigned long long)(
- sect + rdev->data_offset),
- bdevname(rdev->bdev, b));
- printk(KERN_NOTICE "md/raid10:%s: %s: failing "
- "drive\n",
- mdname(mddev),
- bdevname(rdev->bdev, b));
- md_error(mddev, rdev);
- }
- rdev_dec_pending(rdev, mddev);
- rcu_read_lock();
+ if (!rdev ||
+ !test_bit(In_sync, &rdev->flags))
+ continue;
+
+ atomic_inc(&rdev->nr_pending);
+ rcu_read_unlock();
+ if (r10_sync_page_io(rdev,
+ r10_bio->devs[sl].addr +
+ sect,
+ s<<9, conf->tmppage, WRITE)
+ == 0) {
+ /* Well, this device is dead */
+ printk(KERN_NOTICE
+ "md/raid10:%s: read correction "
+ "write failed"
+ " (%d sectors at %llu on %s)\n",
+ mdname(mddev), s,
+ (unsigned long long)(
+ sect + rdev->data_offset),
+ bdevname(rdev->bdev, b));
+ printk(KERN_NOTICE "md/raid10:%s: %s: failing "
+ "drive\n",
+ mdname(mddev),
+ bdevname(rdev->bdev, b));
}
+ rdev_dec_pending(rdev, mddev);
+ rcu_read_lock();
}
sl = start;
while (sl != r10_bio->read_slot) {
+ char b[BDEVNAME_SIZE];
if (sl==0)
sl = conf->copies;
sl--;
d = r10_bio->devs[sl].devnum;
rdev = rcu_dereference(conf->mirrors[d].rdev);
- if (rdev &&
- test_bit(In_sync, &rdev->flags)) {
- char b[BDEVNAME_SIZE];
- atomic_inc(&rdev->nr_pending);
- rcu_read_unlock();
- if (sync_page_io(rdev,
- r10_bio->devs[sl].addr +
- sect,
- s<<9, conf->tmppage,
- READ, false) == 0) {
- /* Well, this device is dead */
- printk(KERN_NOTICE
- "md/raid10:%s: unable to read back "
- "corrected sectors"
- " (%d sectors at %llu on %s)\n",
- mdname(mddev), s,
- (unsigned long long)(
- sect + rdev->data_offset),
- bdevname(rdev->bdev, b));
- printk(KERN_NOTICE "md/raid10:%s: %s: failing drive\n",
- mdname(mddev),
- bdevname(rdev->bdev, b));
-
- md_error(mddev, rdev);
- } else {
- printk(KERN_INFO
- "md/raid10:%s: read error corrected"
- " (%d sectors at %llu on %s)\n",
- mdname(mddev), s,
- (unsigned long long)(
- sect + rdev->data_offset),
- bdevname(rdev->bdev, b));
- }
+ if (!rdev ||
+ !test_bit(In_sync, &rdev->flags))
+ continue;
- rdev_dec_pending(rdev, mddev);
- rcu_read_lock();
+ atomic_inc(&rdev->nr_pending);
+ rcu_read_unlock();
+ switch (r10_sync_page_io(rdev,
+ r10_bio->devs[sl].addr +
+ sect,
+ s<<9, conf->tmppage,
+ READ)) {
+ case 0:
+ /* Well, this device is dead */
+ printk(KERN_NOTICE
+ "md/raid10:%s: unable to read back "
+ "corrected sectors"
+ " (%d sectors at %llu on %s)\n",
+ mdname(mddev), s,
+ (unsigned long long)(
+ sect + rdev->data_offset),
+ bdevname(rdev->bdev, b));
+ printk(KERN_NOTICE "md/raid10:%s: %s: failing "
+ "drive\n",
+ mdname(mddev),
+ bdevname(rdev->bdev, b));
+ break;
+ case 1:
+ printk(KERN_INFO
+ "md/raid10:%s: read error corrected"
+ " (%d sectors at %llu on %s)\n",
+ mdname(mddev), s,
+ (unsigned long long)(
+ sect + rdev->data_offset),
+ bdevname(rdev->bdev, b));
+ atomic_add(s, &rdev->corrected_errors);
}
+
+ rdev_dec_pending(rdev, mddev);
+ rcu_read_lock();
}
rcu_read_unlock();
}
}
+static void bi_complete(struct bio *bio, int error)
+{
+ complete((struct completion *)bio->bi_private);
+}
+
+static int submit_bio_wait(int rw, struct bio *bio)
+{
+ struct completion event;
+ rw |= REQ_SYNC;
+
+ init_completion(&event);
+ bio->bi_private = &event;
+ bio->bi_end_io = bi_complete;
+ submit_bio(rw, bio);
+ wait_for_completion(&event);
+
+ return test_bit(BIO_UPTODATE, &bio->bi_flags);
+}
+
+static int narrow_write_error(r10bio_t *r10_bio, int i)
+{
+ struct bio *bio = r10_bio->master_bio;
+ mddev_t *mddev = r10_bio->mddev;
+ conf_t *conf = mddev->private;
+ mdk_rdev_t *rdev = conf->mirrors[r10_bio->devs[i].devnum].rdev;
+ /* bio has the data to be written to slot 'i' where
+ * we just recently had a write error.
+ * We repeatedly clone the bio and trim down to one block,
+ * then try the write. Where the write fails we record
+ * a bad block.
+ * It is conceivable that the bio doesn't exactly align with
+ * blocks. We must handle this.
+ *
+ * We currently own a reference to the rdev.
+ */
+
+ int block_sectors;
+ sector_t sector;
+ int sectors;
+ int sect_to_write = r10_bio->sectors;
+ int ok = 1;
+
+ if (rdev->badblocks.shift < 0)
+ return 0;
+
+ block_sectors = 1 << rdev->badblocks.shift;
+ sector = r10_bio->sector;
+ sectors = ((r10_bio->sector + block_sectors)
+ & ~(sector_t)(block_sectors - 1))
+ - sector;
+
+ while (sect_to_write) {
+ struct bio *wbio;
+ if (sectors > sect_to_write)
+ sectors = sect_to_write;
+ /* Write at 'sector' for 'sectors' */
+ wbio = bio_clone_mddev(bio, GFP_NOIO, mddev);
+ md_trim_bio(wbio, sector - bio->bi_sector, sectors);
+ wbio->bi_sector = (r10_bio->devs[i].addr+
+ rdev->data_offset+
+ (sector - r10_bio->sector));
+ wbio->bi_bdev = rdev->bdev;
+ if (submit_bio_wait(WRITE, wbio) == 0)
+ /* Failure! */
+ ok = rdev_set_badblocks(rdev, sector,
+ sectors, 0)
+ && ok;
+
+ bio_put(wbio);
+ sect_to_write -= sectors;
+ sector += sectors;
+ sectors = block_sectors;
+ }
+ return ok;
+}
+
+static void handle_read_error(mddev_t *mddev, r10bio_t *r10_bio)
+{
+ int slot = r10_bio->read_slot;
+ int mirror = r10_bio->devs[slot].devnum;
+ struct bio *bio;
+ conf_t *conf = mddev->private;
+ mdk_rdev_t *rdev;
+ char b[BDEVNAME_SIZE];
+ unsigned long do_sync;
+ int max_sectors;
+
+ /* we got a read error. Maybe the drive is bad. Maybe just
+ * the block and we can fix it.
+ * We freeze all other IO, and try reading the block from
+ * other devices. When we find one, we re-write
+ * and check it that fixes the read error.
+ * This is all done synchronously while the array is
+ * frozen.
+ */
+ if (mddev->ro == 0) {
+ freeze_array(conf);
+ fix_read_error(conf, mddev, r10_bio);
+ unfreeze_array(conf);
+ }
+ rdev_dec_pending(conf->mirrors[mirror].rdev, mddev);
+
+ bio = r10_bio->devs[slot].bio;
+ bdevname(bio->bi_bdev, b);
+ r10_bio->devs[slot].bio =
+ mddev->ro ? IO_BLOCKED : NULL;
+read_more:
+ mirror = read_balance(conf, r10_bio, &max_sectors);
+ if (mirror == -1) {
+ printk(KERN_ALERT "md/raid10:%s: %s: unrecoverable I/O"
+ " read error for block %llu\n",
+ mdname(mddev), b,
+ (unsigned long long)r10_bio->sector);
+ raid_end_bio_io(r10_bio);
+ bio_put(bio);
+ return;
+ }
+
+ do_sync = (r10_bio->master_bio->bi_rw & REQ_SYNC);
+ if (bio)
+ bio_put(bio);
+ slot = r10_bio->read_slot;
+ rdev = conf->mirrors[mirror].rdev;
+ printk_ratelimited(
+ KERN_ERR
+ "md/raid10:%s: %s: redirecting"
+ "sector %llu to another mirror\n",
+ mdname(mddev),
+ bdevname(rdev->bdev, b),
+ (unsigned long long)r10_bio->sector);
+ bio = bio_clone_mddev(r10_bio->master_bio,
+ GFP_NOIO, mddev);
+ md_trim_bio(bio,
+ r10_bio->sector - bio->bi_sector,
+ max_sectors);
+ r10_bio->devs[slot].bio = bio;
+ bio->bi_sector = r10_bio->devs[slot].addr
+ + rdev->data_offset;
+ bio->bi_bdev = rdev->bdev;
+ bio->bi_rw = READ | do_sync;
+ bio->bi_private = r10_bio;
+ bio->bi_end_io = raid10_end_read_request;
+ if (max_sectors < r10_bio->sectors) {
+ /* Drat - have to split this up more */
+ struct bio *mbio = r10_bio->master_bio;
+ int sectors_handled =
+ r10_bio->sector + max_sectors
+ - mbio->bi_sector;
+ r10_bio->sectors = max_sectors;
+ spin_lock_irq(&conf->device_lock);
+ if (mbio->bi_phys_segments == 0)
+ mbio->bi_phys_segments = 2;
+ else
+ mbio->bi_phys_segments++;
+ spin_unlock_irq(&conf->device_lock);
+ generic_make_request(bio);
+ bio = NULL;
+
+ r10_bio = mempool_alloc(conf->r10bio_pool,
+ GFP_NOIO);
+ r10_bio->master_bio = mbio;
+ r10_bio->sectors = (mbio->bi_size >> 9)
+ - sectors_handled;
+ r10_bio->state = 0;
+ set_bit(R10BIO_ReadError,
+ &r10_bio->state);
+ r10_bio->mddev = mddev;
+ r10_bio->sector = mbio->bi_sector
+ + sectors_handled;
+
+ goto read_more;
+ } else
+ generic_make_request(bio);
+}
+
+static void handle_write_completed(conf_t *conf, r10bio_t *r10_bio)
+{
+ /* Some sort of write request has finished and it
+ * succeeded in writing where we thought there was a
+ * bad block. So forget the bad block.
+ * Or possibly if failed and we need to record
+ * a bad block.
+ */
+ int m;
+ mdk_rdev_t *rdev;
+
+ if (test_bit(R10BIO_IsSync, &r10_bio->state) ||
+ test_bit(R10BIO_IsRecover, &r10_bio->state)) {
+ for (m = 0; m < conf->copies; m++) {
+ int dev = r10_bio->devs[m].devnum;
+ rdev = conf->mirrors[dev].rdev;
+ if (r10_bio->devs[m].bio == NULL)
+ continue;
+ if (test_bit(BIO_UPTODATE,
+ &r10_bio->devs[m].bio->bi_flags)) {
+ rdev_clear_badblocks(
+ rdev,
+ r10_bio->devs[m].addr,
+ r10_bio->sectors);
+ } else {
+ if (!rdev_set_badblocks(
+ rdev,
+ r10_bio->devs[m].addr,
+ r10_bio->sectors, 0))
+ md_error(conf->mddev, rdev);
+ }
+ }
+ put_buf(r10_bio);
+ } else {
+ for (m = 0; m < conf->copies; m++) {
+ int dev = r10_bio->devs[m].devnum;
+ struct bio *bio = r10_bio->devs[m].bio;
+ rdev = conf->mirrors[dev].rdev;
+ if (bio == IO_MADE_GOOD) {
+ rdev_clear_badblocks(
+ rdev,
+ r10_bio->devs[m].addr,
+ r10_bio->sectors);
+ rdev_dec_pending(rdev, conf->mddev);
+ } else if (bio != NULL &&
+ !test_bit(BIO_UPTODATE, &bio->bi_flags)) {
+ if (!narrow_write_error(r10_bio, m)) {
+ md_error(conf->mddev, rdev);
+ set_bit(R10BIO_Degraded,
+ &r10_bio->state);
+ }
+ rdev_dec_pending(rdev, conf->mddev);
+ }
+ }
+ if (test_bit(R10BIO_WriteError,
+ &r10_bio->state))
+ close_write(r10_bio);
+ raid_end_bio_io(r10_bio);
+ }
+}
+
static void raid10d(mddev_t *mddev)
{
r10bio_t *r10_bio;
- struct bio *bio;
unsigned long flags;
conf_t *conf = mddev->private;
struct list_head *head = &conf->retry_list;
- mdk_rdev_t *rdev;
struct blk_plug plug;
md_check_recovery(mddev);
blk_start_plug(&plug);
for (;;) {
- char b[BDEVNAME_SIZE];
flush_pending_writes(conf);
mddev = r10_bio->mddev;
conf = mddev->private;
- if (test_bit(R10BIO_IsSync, &r10_bio->state))
+ if (test_bit(R10BIO_MadeGood, &r10_bio->state) ||
+ test_bit(R10BIO_WriteError, &r10_bio->state))
+ handle_write_completed(conf, r10_bio);
+ else if (test_bit(R10BIO_IsSync, &r10_bio->state))
sync_request_write(mddev, r10_bio);
else if (test_bit(R10BIO_IsRecover, &r10_bio->state))
recovery_request_write(mddev, r10_bio);
+ else if (test_bit(R10BIO_ReadError, &r10_bio->state))
+ handle_read_error(mddev, r10_bio);
else {
- int slot = r10_bio->read_slot;
- int mirror = r10_bio->devs[slot].devnum;
- /* we got a read error. Maybe the drive is bad. Maybe just
- * the block and we can fix it.
- * We freeze all other IO, and try reading the block from
- * other devices. When we find one, we re-write
- * and check it that fixes the read error.
- * This is all done synchronously while the array is
- * frozen.
+ /* just a partial read to be scheduled from a
+ * separate context
*/
- if (mddev->ro == 0) {
- freeze_array(conf);
- fix_read_error(conf, mddev, r10_bio);
- unfreeze_array(conf);
- }
- rdev_dec_pending(conf->mirrors[mirror].rdev, mddev);
-
- bio = r10_bio->devs[slot].bio;
- r10_bio->devs[slot].bio =
- mddev->ro ? IO_BLOCKED : NULL;
- mirror = read_balance(conf, r10_bio);
- if (mirror == -1) {
- printk(KERN_ALERT "md/raid10:%s: %s: unrecoverable I/O"
- " read error for block %llu\n",
- mdname(mddev),
- bdevname(bio->bi_bdev,b),
- (unsigned long long)r10_bio->sector);
- raid_end_bio_io(r10_bio);
- bio_put(bio);
- } else {
- const unsigned long do_sync = (r10_bio->master_bio->bi_rw & REQ_SYNC);
- bio_put(bio);
- slot = r10_bio->read_slot;
- rdev = conf->mirrors[mirror].rdev;
- if (printk_ratelimit())
- printk(KERN_ERR "md/raid10:%s: %s: redirecting sector %llu to"
- " another mirror\n",
- mdname(mddev),
- bdevname(rdev->bdev,b),
- (unsigned long long)r10_bio->sector);
- bio = bio_clone_mddev(r10_bio->master_bio,
- GFP_NOIO, mddev);
- r10_bio->devs[slot].bio = bio;
- bio->bi_sector = r10_bio->devs[slot].addr
- + rdev->data_offset;
- bio->bi_bdev = rdev->bdev;
- bio->bi_rw = READ | do_sync;
- bio->bi_private = r10_bio;
- bio->bi_end_io = raid10_end_read_request;
- generic_make_request(bio);
- }
+ int slot = r10_bio->read_slot;
+ generic_make_request(r10_bio->devs[slot].bio);
}
+
cond_resched();
+ if (mddev->flags & ~(1<<MD_CHANGE_PENDING))
+ md_check_recovery(mddev);
}
blk_finish_plug(&plug);
}
int i;
int max_sync;
sector_t sync_blocks;
-
sector_t sectors_skipped = 0;
int chunks_skipped = 0;
max_sync = RESYNC_PAGES << (PAGE_SHIFT-9);
if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
/* recovery... the complicated one */
- int j, k;
+ int j;
r10_bio = NULL;
for (i=0 ; i<conf->raid_disks; i++) {
r10bio_t *rb2;
sector_t sect;
int must_sync;
+ int any_working;
if (conf->mirrors[i].rdev == NULL ||
test_bit(In_sync, &conf->mirrors[i].rdev->flags))
must_sync = bitmap_start_sync(mddev->bitmap, sect,
&sync_blocks, still_degraded);
+ any_working = 0;
for (j=0; j<conf->copies;j++) {
+ int k;
int d = r10_bio->devs[j].devnum;
+ sector_t from_addr, to_addr;
+ mdk_rdev_t *rdev;
+ sector_t sector, first_bad;
+ int bad_sectors;
if (!conf->mirrors[d].rdev ||
!test_bit(In_sync, &conf->mirrors[d].rdev->flags))
continue;
/* This is where we read from */
+ any_working = 1;
+ rdev = conf->mirrors[d].rdev;
+ sector = r10_bio->devs[j].addr;
+
+ if (is_badblock(rdev, sector, max_sync,
+ &first_bad, &bad_sectors)) {
+ if (first_bad > sector)
+ max_sync = first_bad - sector;
+ else {
+ bad_sectors -= (sector
+ - first_bad);
+ if (max_sync > bad_sectors)
+ max_sync = bad_sectors;
+ continue;
+ }
+ }
bio = r10_bio->devs[0].bio;
bio->bi_next = biolist;
biolist = bio;
bio->bi_private = r10_bio;
bio->bi_end_io = end_sync_read;
bio->bi_rw = READ;
- bio->bi_sector = r10_bio->devs[j].addr +
+ from_addr = r10_bio->devs[j].addr;
+ bio->bi_sector = from_addr +
conf->mirrors[d].rdev->data_offset;
bio->bi_bdev = conf->mirrors[d].rdev->bdev;
atomic_inc(&conf->mirrors[d].rdev->nr_pending);
bio->bi_private = r10_bio;
bio->bi_end_io = end_sync_write;
bio->bi_rw = WRITE;
- bio->bi_sector = r10_bio->devs[k].addr +
+ to_addr = r10_bio->devs[k].addr;
+ bio->bi_sector = to_addr +
conf->mirrors[i].rdev->data_offset;
bio->bi_bdev = conf->mirrors[i].rdev->bdev;
r10_bio->devs[0].devnum = d;
+ r10_bio->devs[0].addr = from_addr;
r10_bio->devs[1].devnum = i;
+ r10_bio->devs[1].addr = to_addr;
break;
}
if (j == conf->copies) {
- /* Cannot recover, so abort the recovery */
+ /* Cannot recover, so abort the recovery or
+ * record a bad block */
put_buf(r10_bio);
if (rb2)
atomic_dec(&rb2->remaining);
r10_bio = rb2;
- if (!test_and_set_bit(MD_RECOVERY_INTR,
- &mddev->recovery))
- printk(KERN_INFO "md/raid10:%s: insufficient "
- "working devices for recovery.\n",
- mdname(mddev));
+ if (any_working) {
+ /* problem is that there are bad blocks
+ * on other device(s)
+ */
+ int k;
+ for (k = 0; k < conf->copies; k++)
+ if (r10_bio->devs[k].devnum == i)
+ break;
+ if (!rdev_set_badblocks(
+ conf->mirrors[i].rdev,
+ r10_bio->devs[k].addr,
+ max_sync, 0))
+ any_working = 0;
+ }
+ if (!any_working) {
+ if (!test_and_set_bit(MD_RECOVERY_INTR,
+ &mddev->recovery))
+ printk(KERN_INFO "md/raid10:%s: insufficient "
+ "working devices for recovery.\n",
+ mdname(mddev));
+ conf->mirrors[i].recovery_disabled
+ = mddev->recovery_disabled;
+ }
break;
}
}
for (i=0; i<conf->copies; i++) {
int d = r10_bio->devs[i].devnum;
+ sector_t first_bad, sector;
+ int bad_sectors;
+
bio = r10_bio->devs[i].bio;
bio->bi_end_io = NULL;
clear_bit(BIO_UPTODATE, &bio->bi_flags);
if (conf->mirrors[d].rdev == NULL ||
test_bit(Faulty, &conf->mirrors[d].rdev->flags))
continue;
+ sector = r10_bio->devs[i].addr;
+ if (is_badblock(conf->mirrors[d].rdev,
+ sector, max_sync,
+ &first_bad, &bad_sectors)) {
+ if (first_bad > sector)
+ max_sync = first_bad - sector;
+ else {
+ bad_sectors -= (sector - first_bad);
+ if (max_sync > bad_sectors)
+ max_sync = max_sync;
+ continue;
+ }
+ }
atomic_inc(&conf->mirrors[d].rdev->nr_pending);
atomic_inc(&r10_bio->remaining);
bio->bi_next = biolist;
bio->bi_private = r10_bio;
bio->bi_end_io = end_sync_read;
bio->bi_rw = READ;
- bio->bi_sector = r10_bio->devs[i].addr +
+ bio->bi_sector = sector +
conf->mirrors[d].rdev->data_offset;
bio->bi_bdev = conf->mirrors[d].rdev->bdev;
count++;
return sectors_skipped + nr_sectors;
giveup:
/* There is nowhere to write, so all non-sync
- * drives must be failed, so try the next chunk...
+ * drives must be failed or in resync, all drives
+ * have a bad block, so try the next chunk...
*/
if (sector_nr + max_sync < max_sector)
max_sector = sector_nr + max_sync;
(conf->raid_disks / conf->near_copies));
list_for_each_entry(rdev, &mddev->disks, same_set) {
+
disk_idx = rdev->raid_disk;
if (disk_idx >= conf->raid_disks
|| disk_idx < 0)
disk->head_position = 0;
}
/* need to check that every block has at least one working mirror */
- if (!enough(conf)) {
+ if (!enough(conf, -1)) {
printk(KERN_ERR "md/raid10:%s: not enough operational mirrors.\n",
mdname(mddev));
goto out_free_conf;
struct mirror_info {
mdk_rdev_t *rdev;
sector_t head_position;
+ int recovery_disabled; /* matches
+ * mddev->recovery_disabled
+ * when we shouldn't try
+ * recovering this device.
+ */
};
typedef struct r10bio_s r10bio_t;
* level, we store IO_BLOCKED in the appropriate 'bios' pointer
*/
#define IO_BLOCKED ((struct bio*)1)
+/* When we successfully write to a known bad-block, we need to remove the
+ * bad-block marking which must be done from process context. So we record
+ * the success by setting devs[n].bio to IO_MADE_GOOD
+ */
+#define IO_MADE_GOOD ((struct bio *)2)
+
+#define BIO_SPECIAL(bio) ((unsigned long)bio <= 2)
/* bits for r10bio.state */
#define R10BIO_Uptodate 0
#define R10BIO_IsSync 1
#define R10BIO_IsRecover 2
#define R10BIO_Degraded 3
+/* Set ReadError on bios that experience a read error
+ * so that raid10d knows what to do with them.
+ */
+#define R10BIO_ReadError 4
+/* If a write for this request means we can clear some
+ * known-bad-block records, we set this flag.
+ */
+#define R10BIO_MadeGood 5
+#define R10BIO_WriteError 6
#endif
#include <linux/seq_file.h>
#include <linux/cpu.h>
#include <linux/slab.h>
+#include <linux/ratelimit.h>
#include "md.h"
#include "raid5.h"
#include "raid0.h"
#define __inline__
#endif
-#define printk_rl(args...) ((void) (printk_ratelimit() && printk(args)))
-
/*
* We maintain a biased count of active stripes in the bottom 16 bits of
* bi_phys_segments, and a count of processed stripes in the upper 16 bits
(unsigned long long)sh->sector, i, dev->toread,
dev->read, dev->towrite, dev->written,
test_bit(R5_LOCKED, &dev->flags));
- BUG();
+ WARN_ON(1);
}
dev->flags = 0;
raid5_build_block(sh, i, previous);
atomic_inc(&rdev->nr_pending);
rcu_read_unlock();
+ /* We have already checked bad blocks for reads. Now
+ * need to check for writes.
+ */
+ while ((rw & WRITE) && rdev &&
+ test_bit(WriteErrorSeen, &rdev->flags)) {
+ sector_t first_bad;
+ int bad_sectors;
+ int bad = is_badblock(rdev, sh->sector, STRIPE_SECTORS,
+ &first_bad, &bad_sectors);
+ if (!bad)
+ break;
+
+ if (bad < 0) {
+ set_bit(BlockedBadBlocks, &rdev->flags);
+ if (!conf->mddev->external &&
+ conf->mddev->flags) {
+ /* It is very unlikely, but we might
+ * still need to write out the
+ * bad block log - better give it
+ * a chance*/
+ md_check_recovery(conf->mddev);
+ }
+ md_wait_for_blocked_rdev(rdev, conf->mddev);
+ } else {
+ /* Acknowledged bad block - skip the write */
+ rdev_dec_pending(rdev, conf->mddev);
+ rdev = NULL;
+ }
+ }
+
if (rdev) {
if (s->syncing || s->expanding || s->expanded)
md_sync_acct(rdev->bdev, STRIPE_SECTORS);
bi->bi_io_vec[0].bv_offset = 0;
bi->bi_size = STRIPE_SIZE;
bi->bi_next = NULL;
- if ((rw & WRITE) &&
- test_bit(R5_ReWrite, &sh->dev[i].flags))
- atomic_add(STRIPE_SECTORS,
- &rdev->corrected_errors);
generic_make_request(bi);
} else {
if (rw & WRITE)
if (test_and_clear_bit(R5_Wantdrain, &dev->flags)) {
struct bio *wbi;
- spin_lock(&sh->lock);
+ spin_lock_irq(&sh->raid_conf->device_lock);
chosen = dev->towrite;
dev->towrite = NULL;
BUG_ON(dev->written);
wbi = dev->written = chosen;
- spin_unlock(&sh->lock);
+ spin_unlock_irq(&sh->raid_conf->device_lock);
while (wbi && wbi->bi_sector <
dev->sector + STRIPE_SECTORS) {
static int grow_one_stripe(raid5_conf_t *conf)
{
struct stripe_head *sh;
- sh = kmem_cache_alloc(conf->slab_cache, GFP_KERNEL);
+ sh = kmem_cache_zalloc(conf->slab_cache, GFP_KERNEL);
if (!sh)
return 0;
- memset(sh, 0, sizeof(*sh) + (conf->pool_size-1)*sizeof(struct r5dev));
+
sh->raid_conf = conf;
- spin_lock_init(&sh->lock);
#ifdef CONFIG_MULTICORE_RAID456
init_waitqueue_head(&sh->ops.wait_for_ops);
#endif
return -ENOMEM;
for (i = conf->max_nr_stripes; i; i--) {
- nsh = kmem_cache_alloc(sc, GFP_KERNEL);
+ nsh = kmem_cache_zalloc(sc, GFP_KERNEL);
if (!nsh)
break;
- memset(nsh, 0, sizeof(*nsh) + (newsize-1)*sizeof(struct r5dev));
-
nsh->raid_conf = conf;
- spin_lock_init(&nsh->lock);
#ifdef CONFIG_MULTICORE_RAID456
init_waitqueue_head(&nsh->ops.wait_for_ops);
#endif
set_bit(R5_UPTODATE, &sh->dev[i].flags);
if (test_bit(R5_ReadError, &sh->dev[i].flags)) {
rdev = conf->disks[i].rdev;
- printk_rl(KERN_INFO "md/raid:%s: read error corrected"
- " (%lu sectors at %llu on %s)\n",
- mdname(conf->mddev), STRIPE_SECTORS,
- (unsigned long long)(sh->sector
- + rdev->data_offset),
- bdevname(rdev->bdev, b));
+ printk_ratelimited(
+ KERN_INFO
+ "md/raid:%s: read error corrected"
+ " (%lu sectors at %llu on %s)\n",
+ mdname(conf->mddev), STRIPE_SECTORS,
+ (unsigned long long)(sh->sector
+ + rdev->data_offset),
+ bdevname(rdev->bdev, b));
+ atomic_add(STRIPE_SECTORS, &rdev->corrected_errors);
clear_bit(R5_ReadError, &sh->dev[i].flags);
clear_bit(R5_ReWrite, &sh->dev[i].flags);
}
clear_bit(R5_UPTODATE, &sh->dev[i].flags);
atomic_inc(&rdev->read_errors);
if (conf->mddev->degraded >= conf->max_degraded)
- printk_rl(KERN_WARNING
- "md/raid:%s: read error not correctable "
- "(sector %llu on %s).\n",
- mdname(conf->mddev),
- (unsigned long long)(sh->sector
- + rdev->data_offset),
- bdn);
+ printk_ratelimited(
+ KERN_WARNING
+ "md/raid:%s: read error not correctable "
+ "(sector %llu on %s).\n",
+ mdname(conf->mddev),
+ (unsigned long long)(sh->sector
+ + rdev->data_offset),
+ bdn);
else if (test_bit(R5_ReWrite, &sh->dev[i].flags))
/* Oh, no!!! */
- printk_rl(KERN_WARNING
- "md/raid:%s: read error NOT corrected!! "
- "(sector %llu on %s).\n",
- mdname(conf->mddev),
- (unsigned long long)(sh->sector
- + rdev->data_offset),
- bdn);
+ printk_ratelimited(
+ KERN_WARNING
+ "md/raid:%s: read error NOT corrected!! "
+ "(sector %llu on %s).\n",
+ mdname(conf->mddev),
+ (unsigned long long)(sh->sector
+ + rdev->data_offset),
+ bdn);
else if (atomic_read(&rdev->read_errors)
> conf->max_nr_stripes)
printk(KERN_WARNING
raid5_conf_t *conf = sh->raid_conf;
int disks = sh->disks, i;
int uptodate = test_bit(BIO_UPTODATE, &bi->bi_flags);
+ sector_t first_bad;
+ int bad_sectors;
for (i=0 ; i<disks; i++)
if (bi == &sh->dev[i].req)
return;
}
- if (!uptodate)
- md_error(conf->mddev, conf->disks[i].rdev);
+ if (!uptodate) {
+ set_bit(WriteErrorSeen, &conf->disks[i].rdev->flags);
+ set_bit(R5_WriteError, &sh->dev[i].flags);
+ } else if (is_badblock(conf->disks[i].rdev, sh->sector, STRIPE_SECTORS,
+ &first_bad, &bad_sectors))
+ set_bit(R5_MadeGood, &sh->dev[i].flags);
rdev_dec_pending(conf->disks[i].rdev, conf->mddev);
*/
set_bit(MD_RECOVERY_INTR, &mddev->recovery);
}
+ set_bit(Blocked, &rdev->flags);
set_bit(Faulty, &rdev->flags);
set_bit(MD_CHANGE_DEVS, &mddev->flags);
printk(KERN_ALERT
/*
* Select the parity disk based on the user selected algorithm.
*/
- pd_idx = qd_idx = ~0;
+ pd_idx = qd_idx = -1;
switch(conf->level) {
case 4:
pd_idx = data_disks;
raid5_conf_t *conf = sh->raid_conf;
int firstwrite=0;
- pr_debug("adding bh b#%llu to stripe s#%llu\n",
+ pr_debug("adding bi b#%llu to stripe s#%llu\n",
(unsigned long long)bi->bi_sector,
(unsigned long long)sh->sector);
- spin_lock(&sh->lock);
spin_lock_irq(&conf->device_lock);
if (forwrite) {
bip = &sh->dev[dd_idx].towrite;
bi->bi_next = *bip;
*bip = bi;
bi->bi_phys_segments++;
- spin_unlock_irq(&conf->device_lock);
- spin_unlock(&sh->lock);
-
- pr_debug("added bi b#%llu to stripe s#%llu, disk %d.\n",
- (unsigned long long)bi->bi_sector,
- (unsigned long long)sh->sector, dd_idx);
-
- if (conf->mddev->bitmap && firstwrite) {
- bitmap_startwrite(conf->mddev->bitmap, sh->sector,
- STRIPE_SECTORS, 0);
- sh->bm_seq = conf->seq_flush+1;
- set_bit(STRIPE_BIT_DELAY, &sh->state);
- }
if (forwrite) {
/* check if page is covered */
if (sector >= sh->dev[dd_idx].sector + STRIPE_SECTORS)
set_bit(R5_OVERWRITE, &sh->dev[dd_idx].flags);
}
+ spin_unlock_irq(&conf->device_lock);
+
+ pr_debug("added bi b#%llu to stripe s#%llu, disk %d.\n",
+ (unsigned long long)(*bip)->bi_sector,
+ (unsigned long long)sh->sector, dd_idx);
+
+ if (conf->mddev->bitmap && firstwrite) {
+ bitmap_startwrite(conf->mddev->bitmap, sh->sector,
+ STRIPE_SECTORS, 0);
+ sh->bm_seq = conf->seq_flush+1;
+ set_bit(STRIPE_BIT_DELAY, &sh->state);
+ }
return 1;
overlap:
set_bit(R5_Overlap, &sh->dev[dd_idx].flags);
spin_unlock_irq(&conf->device_lock);
- spin_unlock(&sh->lock);
return 0;
}
rcu_read_lock();
rdev = rcu_dereference(conf->disks[i].rdev);
if (rdev && test_bit(In_sync, &rdev->flags))
- /* multiple read failures in one stripe */
- md_error(conf->mddev, rdev);
+ atomic_inc(&rdev->nr_pending);
+ else
+ rdev = NULL;
rcu_read_unlock();
+ if (rdev) {
+ if (!rdev_set_badblocks(
+ rdev,
+ sh->sector,
+ STRIPE_SECTORS, 0))
+ md_error(conf->mddev, rdev);
+ rdev_dec_pending(rdev, conf->mddev);
+ }
}
spin_lock_irq(&conf->device_lock);
/* fail all writes first */
if (bitmap_end)
bitmap_endwrite(conf->mddev->bitmap, sh->sector,
STRIPE_SECTORS, 0, 0);
+ /* If we were in the middle of a write the parity block might
+ * still be locked - so just clear all R5_LOCKED flags
+ */
+ clear_bit(R5_LOCKED, &sh->dev[i].flags);
}
if (test_and_clear_bit(STRIPE_FULL_WRITE, &sh->state))
md_wakeup_thread(conf->mddev->thread);
}
-/* fetch_block5 - checks the given member device to see if its data needs
- * to be read or computed to satisfy a request.
- *
- * Returns 1 when no more member devices need to be checked, otherwise returns
- * 0 to tell the loop in handle_stripe_fill5 to continue
- */
-static int fetch_block5(struct stripe_head *sh, struct stripe_head_state *s,
- int disk_idx, int disks)
-{
- struct r5dev *dev = &sh->dev[disk_idx];
- struct r5dev *failed_dev = &sh->dev[s->failed_num];
-
- /* is the data in this block needed, and can we get it? */
- if (!test_bit(R5_LOCKED, &dev->flags) &&
- !test_bit(R5_UPTODATE, &dev->flags) &&
- (dev->toread ||
- (dev->towrite && !test_bit(R5_OVERWRITE, &dev->flags)) ||
- s->syncing || s->expanding ||
- (s->failed &&
- (failed_dev->toread ||
- (failed_dev->towrite &&
- !test_bit(R5_OVERWRITE, &failed_dev->flags)))))) {
- /* We would like to get this block, possibly by computing it,
- * otherwise read it if the backing disk is insync
- */
- if ((s->uptodate == disks - 1) &&
- (s->failed && disk_idx == s->failed_num)) {
- set_bit(STRIPE_COMPUTE_RUN, &sh->state);
- set_bit(STRIPE_OP_COMPUTE_BLK, &s->ops_request);
- set_bit(R5_Wantcompute, &dev->flags);
- sh->ops.target = disk_idx;
- sh->ops.target2 = -1;
- s->req_compute = 1;
- /* Careful: from this point on 'uptodate' is in the eye
- * of raid_run_ops which services 'compute' operations
- * before writes. R5_Wantcompute flags a block that will
- * be R5_UPTODATE by the time it is needed for a
- * subsequent operation.
- */
- s->uptodate++;
- return 1; /* uptodate + compute == disks */
- } else if (test_bit(R5_Insync, &dev->flags)) {
- set_bit(R5_LOCKED, &dev->flags);
- set_bit(R5_Wantread, &dev->flags);
- s->locked++;
- pr_debug("Reading block %d (sync=%d)\n", disk_idx,
- s->syncing);
- }
- }
-
- return 0;
-}
-
-/**
- * handle_stripe_fill5 - read or compute data to satisfy pending requests.
- */
-static void handle_stripe_fill5(struct stripe_head *sh,
- struct stripe_head_state *s, int disks)
+static void
+handle_failed_sync(raid5_conf_t *conf, struct stripe_head *sh,
+ struct stripe_head_state *s)
{
+ int abort = 0;
int i;
- /* look for blocks to read/compute, skip this if a compute
- * is already in flight, or if the stripe contents are in the
- * midst of changing due to a write
+ md_done_sync(conf->mddev, STRIPE_SECTORS, 0);
+ clear_bit(STRIPE_SYNCING, &sh->state);
+ s->syncing = 0;
+ /* There is nothing more to do for sync/check/repair.
+ * For recover we need to record a bad block on all
+ * non-sync devices, or abort the recovery
*/
- if (!test_bit(STRIPE_COMPUTE_RUN, &sh->state) && !sh->check_state &&
- !sh->reconstruct_state)
- for (i = disks; i--; )
- if (fetch_block5(sh, s, i, disks))
- break;
- set_bit(STRIPE_HANDLE, &sh->state);
+ if (!test_bit(MD_RECOVERY_RECOVER, &conf->mddev->recovery))
+ return;
+ /* During recovery devices cannot be removed, so locking and
+ * refcounting of rdevs is not needed
+ */
+ for (i = 0; i < conf->raid_disks; i++) {
+ mdk_rdev_t *rdev = conf->disks[i].rdev;
+ if (!rdev
+ || test_bit(Faulty, &rdev->flags)
+ || test_bit(In_sync, &rdev->flags))
+ continue;
+ if (!rdev_set_badblocks(rdev, sh->sector,
+ STRIPE_SECTORS, 0))
+ abort = 1;
+ }
+ if (abort) {
+ conf->recovery_disabled = conf->mddev->recovery_disabled;
+ set_bit(MD_RECOVERY_INTR, &conf->mddev->recovery);
+ }
}
-/* fetch_block6 - checks the given member device to see if its data needs
+/* fetch_block - checks the given member device to see if its data needs
* to be read or computed to satisfy a request.
*
* Returns 1 when no more member devices need to be checked, otherwise returns
- * 0 to tell the loop in handle_stripe_fill6 to continue
+ * 0 to tell the loop in handle_stripe_fill to continue
*/
-static int fetch_block6(struct stripe_head *sh, struct stripe_head_state *s,
- struct r6_state *r6s, int disk_idx, int disks)
+static int fetch_block(struct stripe_head *sh, struct stripe_head_state *s,
+ int disk_idx, int disks)
{
struct r5dev *dev = &sh->dev[disk_idx];
- struct r5dev *fdev[2] = { &sh->dev[r6s->failed_num[0]],
- &sh->dev[r6s->failed_num[1]] };
+ struct r5dev *fdev[2] = { &sh->dev[s->failed_num[0]],
+ &sh->dev[s->failed_num[1]] };
+ /* is the data in this block needed, and can we get it? */
if (!test_bit(R5_LOCKED, &dev->flags) &&
!test_bit(R5_UPTODATE, &dev->flags) &&
(dev->toread ||
(dev->towrite && !test_bit(R5_OVERWRITE, &dev->flags)) ||
s->syncing || s->expanding ||
- (s->failed >= 1 &&
- (fdev[0]->toread || s->to_write)) ||
- (s->failed >= 2 &&
- (fdev[1]->toread || s->to_write)))) {
+ (s->failed >= 1 && fdev[0]->toread) ||
+ (s->failed >= 2 && fdev[1]->toread) ||
+ (sh->raid_conf->level <= 5 && s->failed && fdev[0]->towrite &&
+ !test_bit(R5_OVERWRITE, &fdev[0]->flags)) ||
+ (sh->raid_conf->level == 6 && s->failed && s->to_write))) {
/* we would like to get this block, possibly by computing it,
* otherwise read it if the backing disk is insync
*/
BUG_ON(test_bit(R5_Wantcompute, &dev->flags));
BUG_ON(test_bit(R5_Wantread, &dev->flags));
if ((s->uptodate == disks - 1) &&
- (s->failed && (disk_idx == r6s->failed_num[0] ||
- disk_idx == r6s->failed_num[1]))) {
+ (s->failed && (disk_idx == s->failed_num[0] ||
+ disk_idx == s->failed_num[1]))) {
/* have disk failed, and we're requested to fetch it;
* do compute it
*/
sh->ops.target = disk_idx;
sh->ops.target2 = -1; /* no 2nd target */
s->req_compute = 1;
+ /* Careful: from this point on 'uptodate' is in the eye
+ * of raid_run_ops which services 'compute' operations
+ * before writes. R5_Wantcompute flags a block that will
+ * be R5_UPTODATE by the time it is needed for a
+ * subsequent operation.
+ */
s->uptodate++;
return 1;
} else if (s->uptodate == disks-2 && s->failed >= 2) {
}
/**
- * handle_stripe_fill6 - read or compute data to satisfy pending requests.
+ * handle_stripe_fill - read or compute data to satisfy pending requests.
*/
-static void handle_stripe_fill6(struct stripe_head *sh,
- struct stripe_head_state *s, struct r6_state *r6s,
- int disks)
+static void handle_stripe_fill(struct stripe_head *sh,
+ struct stripe_head_state *s,
+ int disks)
{
int i;
if (!test_bit(STRIPE_COMPUTE_RUN, &sh->state) && !sh->check_state &&
!sh->reconstruct_state)
for (i = disks; i--; )
- if (fetch_block6(sh, s, r6s, i, disks))
+ if (fetch_block(sh, s, i, disks))
break;
set_bit(STRIPE_HANDLE, &sh->state);
}
md_wakeup_thread(conf->mddev->thread);
}
-static void handle_stripe_dirtying5(raid5_conf_t *conf,
- struct stripe_head *sh, struct stripe_head_state *s, int disks)
+static void handle_stripe_dirtying(raid5_conf_t *conf,
+ struct stripe_head *sh,
+ struct stripe_head_state *s,
+ int disks)
{
int rmw = 0, rcw = 0, i;
- for (i = disks; i--; ) {
+ if (conf->max_degraded == 2) {
+ /* RAID6 requires 'rcw' in current implementation
+ * Calculate the real rcw later - for now fake it
+ * look like rcw is cheaper
+ */
+ rcw = 1; rmw = 2;
+ } else for (i = disks; i--; ) {
/* would I have to read this buffer for read_modify_write */
struct r5dev *dev = &sh->dev[i];
if ((dev->towrite || i == sh->pd_idx) &&
}
}
}
- if (rcw <= rmw && rcw > 0)
+ if (rcw <= rmw && rcw > 0) {
/* want reconstruct write, but need to get some data */
+ rcw = 0;
for (i = disks; i--; ) {
struct r5dev *dev = &sh->dev[i];
if (!test_bit(R5_OVERWRITE, &dev->flags) &&
- i != sh->pd_idx &&
+ i != sh->pd_idx && i != sh->qd_idx &&
!test_bit(R5_LOCKED, &dev->flags) &&
!(test_bit(R5_UPTODATE, &dev->flags) ||
- test_bit(R5_Wantcompute, &dev->flags)) &&
- test_bit(R5_Insync, &dev->flags)) {
+ test_bit(R5_Wantcompute, &dev->flags))) {
+ rcw++;
+ if (!test_bit(R5_Insync, &dev->flags))
+ continue; /* it's a failed drive */
if (
test_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) {
pr_debug("Read_old block "
}
}
}
+ }
/* now if nothing is locked, and if we have enough data,
* we can start a write request
*/
schedule_reconstruction(sh, s, rcw == 0, 0);
}
-static void handle_stripe_dirtying6(raid5_conf_t *conf,
- struct stripe_head *sh, struct stripe_head_state *s,
- struct r6_state *r6s, int disks)
-{
- int rcw = 0, pd_idx = sh->pd_idx, i;
- int qd_idx = sh->qd_idx;
-
- set_bit(STRIPE_HANDLE, &sh->state);
- for (i = disks; i--; ) {
- struct r5dev *dev = &sh->dev[i];
- /* check if we haven't enough data */
- if (!test_bit(R5_OVERWRITE, &dev->flags) &&
- i != pd_idx && i != qd_idx &&
- !test_bit(R5_LOCKED, &dev->flags) &&
- !(test_bit(R5_UPTODATE, &dev->flags) ||
- test_bit(R5_Wantcompute, &dev->flags))) {
- rcw++;
- if (!test_bit(R5_Insync, &dev->flags))
- continue; /* it's a failed drive */
-
- if (
- test_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) {
- pr_debug("Read_old stripe %llu "
- "block %d for Reconstruct\n",
- (unsigned long long)sh->sector, i);
- set_bit(R5_LOCKED, &dev->flags);
- set_bit(R5_Wantread, &dev->flags);
- s->locked++;
- } else {
- pr_debug("Request delayed stripe %llu "
- "block %d for Reconstruct\n",
- (unsigned long long)sh->sector, i);
- set_bit(STRIPE_DELAYED, &sh->state);
- set_bit(STRIPE_HANDLE, &sh->state);
- }
- }
- }
- /* now if nothing is locked, and if we have enough data, we can start a
- * write request
- */
- if ((s->req_compute || !test_bit(STRIPE_COMPUTE_RUN, &sh->state)) &&
- s->locked == 0 && rcw == 0 &&
- !test_bit(STRIPE_BIT_DELAY, &sh->state)) {
- schedule_reconstruction(sh, s, 1, 0);
- }
-}
-
static void handle_parity_checks5(raid5_conf_t *conf, struct stripe_head *sh,
struct stripe_head_state *s, int disks)
{
s->uptodate--;
break;
}
- dev = &sh->dev[s->failed_num];
+ dev = &sh->dev[s->failed_num[0]];
/* fall through */
case check_state_compute_result:
sh->check_state = check_state_idle;
static void handle_parity_checks6(raid5_conf_t *conf, struct stripe_head *sh,
struct stripe_head_state *s,
- struct r6_state *r6s, int disks)
+ int disks)
{
int pd_idx = sh->pd_idx;
int qd_idx = sh->qd_idx;
switch (sh->check_state) {
case check_state_idle:
/* start a new check operation if there are < 2 failures */
- if (s->failed == r6s->q_failed) {
+ if (s->failed == s->q_failed) {
/* The only possible failed device holds Q, so it
* makes sense to check P (If anything else were failed,
* we would have used P to recreate it).
*/
sh->check_state = check_state_run;
}
- if (!r6s->q_failed && s->failed < 2) {
+ if (!s->q_failed && s->failed < 2) {
/* Q is not failed, and we didn't use it to generate
* anything, so it makes sense to check it
*/
*/
BUG_ON(s->uptodate < disks - 1); /* We don't need Q to recover */
if (s->failed == 2) {
- dev = &sh->dev[r6s->failed_num[1]];
+ dev = &sh->dev[s->failed_num[1]];
s->locked++;
set_bit(R5_LOCKED, &dev->flags);
set_bit(R5_Wantwrite, &dev->flags);
}
if (s->failed >= 1) {
- dev = &sh->dev[r6s->failed_num[0]];
+ dev = &sh->dev[s->failed_num[0]];
s->locked++;
set_bit(R5_LOCKED, &dev->flags);
set_bit(R5_Wantwrite, &dev->flags);
}
}
-static void handle_stripe_expansion(raid5_conf_t *conf, struct stripe_head *sh,
- struct r6_state *r6s)
+static void handle_stripe_expansion(raid5_conf_t *conf, struct stripe_head *sh)
{
int i;
set_bit(R5_UPTODATE, &sh2->dev[dd_idx].flags);
for (j = 0; j < conf->raid_disks; j++)
if (j != sh2->pd_idx &&
- (!r6s || j != sh2->qd_idx) &&
+ j != sh2->qd_idx &&
!test_bit(R5_Expanded, &sh2->dev[j].flags))
break;
if (j == conf->raid_disks) {
*
*/
-static void handle_stripe5(struct stripe_head *sh)
+static void analyse_stripe(struct stripe_head *sh, struct stripe_head_state *s)
{
raid5_conf_t *conf = sh->raid_conf;
- int disks = sh->disks, i;
- struct bio *return_bi = NULL;
- struct stripe_head_state s;
+ int disks = sh->disks;
struct r5dev *dev;
- mdk_rdev_t *blocked_rdev = NULL;
- int prexor;
- int dec_preread_active = 0;
+ int i;
- memset(&s, 0, sizeof(s));
- pr_debug("handling stripe %llu, state=%#lx cnt=%d, pd_idx=%d check:%d "
- "reconstruct:%d\n", (unsigned long long)sh->sector, sh->state,
- atomic_read(&sh->count), sh->pd_idx, sh->check_state,
- sh->reconstruct_state);
+ memset(s, 0, sizeof(*s));
- spin_lock(&sh->lock);
- clear_bit(STRIPE_HANDLE, &sh->state);
- clear_bit(STRIPE_DELAYED, &sh->state);
-
- s.syncing = test_bit(STRIPE_SYNCING, &sh->state);
- s.expanding = test_bit(STRIPE_EXPAND_SOURCE, &sh->state);
- s.expanded = test_bit(STRIPE_EXPAND_READY, &sh->state);
+ s->syncing = test_bit(STRIPE_SYNCING, &sh->state);
+ s->expanding = test_bit(STRIPE_EXPAND_SOURCE, &sh->state);
+ s->expanded = test_bit(STRIPE_EXPAND_READY, &sh->state);
+ s->failed_num[0] = -1;
+ s->failed_num[1] = -1;
/* Now to look around and see what can be done */
rcu_read_lock();
+ spin_lock_irq(&conf->device_lock);
for (i=disks; i--; ) {
mdk_rdev_t *rdev;
+ sector_t first_bad;
+ int bad_sectors;
+ int is_bad = 0;
dev = &sh->dev[i];
- pr_debug("check %d: state 0x%lx toread %p read %p write %p "
- "written %p\n", i, dev->flags, dev->toread, dev->read,
- dev->towrite, dev->written);
-
- /* maybe we can request a biofill operation
+ pr_debug("check %d: state 0x%lx read %p write %p written %p\n",
+ i, dev->flags, dev->toread, dev->towrite, dev->written);
+ /* maybe we can reply to a read
*
* new wantfill requests are only permitted while
* ops_complete_biofill is guaranteed to be inactive
set_bit(R5_Wantfill, &dev->flags);
/* now count some things */
- if (test_bit(R5_LOCKED, &dev->flags)) s.locked++;
- if (test_bit(R5_UPTODATE, &dev->flags)) s.uptodate++;
- if (test_bit(R5_Wantcompute, &dev->flags)) s.compute++;
+ if (test_bit(R5_LOCKED, &dev->flags))
+ s->locked++;
+ if (test_bit(R5_UPTODATE, &dev->flags))
+ s->uptodate++;
+ if (test_bit(R5_Wantcompute, &dev->flags)) {
+ s->compute++;
+ BUG_ON(s->compute > 2);
+ }
if (test_bit(R5_Wantfill, &dev->flags))
- s.to_fill++;
+ s->to_fill++;
else if (dev->toread)
- s.to_read++;
+ s->to_read++;
if (dev->towrite) {
- s.to_write++;
+ s->to_write++;
if (!test_bit(R5_OVERWRITE, &dev->flags))
- s.non_overwrite++;
+ s->non_overwrite++;
}
if (dev->written)
- s.written++;
+ s->written++;
rdev = rcu_dereference(conf->disks[i].rdev);
- if (blocked_rdev == NULL &&
- rdev && unlikely(test_bit(Blocked, &rdev->flags))) {
- blocked_rdev = rdev;
- atomic_inc(&rdev->nr_pending);
+ if (rdev) {
+ is_bad = is_badblock(rdev, sh->sector, STRIPE_SECTORS,
+ &first_bad, &bad_sectors);
+ if (s->blocked_rdev == NULL
+ && (test_bit(Blocked, &rdev->flags)
+ || is_bad < 0)) {
+ if (is_bad < 0)
+ set_bit(BlockedBadBlocks,
+ &rdev->flags);
+ s->blocked_rdev = rdev;
+ atomic_inc(&rdev->nr_pending);
+ }
}
clear_bit(R5_Insync, &dev->flags);
if (!rdev)
/* Not in-sync */;
- else if (test_bit(In_sync, &rdev->flags))
+ else if (is_bad) {
+ /* also not in-sync */
+ if (!test_bit(WriteErrorSeen, &rdev->flags)) {
+ /* treat as in-sync, but with a read error
+ * which we can now try to correct
+ */
+ set_bit(R5_Insync, &dev->flags);
+ set_bit(R5_ReadError, &dev->flags);
+ }
+ } else if (test_bit(In_sync, &rdev->flags))
set_bit(R5_Insync, &dev->flags);
else {
- /* could be in-sync depending on recovery/reshape status */
+ /* in sync if before recovery_offset */
if (sh->sector + STRIPE_SECTORS <= rdev->recovery_offset)
set_bit(R5_Insync, &dev->flags);
}
+ if (test_bit(R5_WriteError, &dev->flags)) {
+ clear_bit(R5_Insync, &dev->flags);
+ if (!test_bit(Faulty, &rdev->flags)) {
+ s->handle_bad_blocks = 1;
+ atomic_inc(&rdev->nr_pending);
+ } else
+ clear_bit(R5_WriteError, &dev->flags);
+ }
+ if (test_bit(R5_MadeGood, &dev->flags)) {
+ if (!test_bit(Faulty, &rdev->flags)) {
+ s->handle_bad_blocks = 1;
+ atomic_inc(&rdev->nr_pending);
+ } else
+ clear_bit(R5_MadeGood, &dev->flags);
+ }
if (!test_bit(R5_Insync, &dev->flags)) {
/* The ReadError flag will just be confusing now */
clear_bit(R5_ReadError, &dev->flags);
if (test_bit(R5_ReadError, &dev->flags))
clear_bit(R5_Insync, &dev->flags);
if (!test_bit(R5_Insync, &dev->flags)) {
- s.failed++;
- s.failed_num = i;
+ if (s->failed < 2)
+ s->failed_num[s->failed] = i;
+ s->failed++;
}
}
+ spin_unlock_irq(&conf->device_lock);
rcu_read_unlock();
-
- if (unlikely(blocked_rdev)) {
- if (s.syncing || s.expanding || s.expanded ||
- s.to_write || s.written) {
- set_bit(STRIPE_HANDLE, &sh->state);
- goto unlock;
- }
- /* There is nothing for the blocked_rdev to block */
- rdev_dec_pending(blocked_rdev, conf->mddev);
- blocked_rdev = NULL;
- }
-
- if (s.to_fill && !test_bit(STRIPE_BIOFILL_RUN, &sh->state)) {
- set_bit(STRIPE_OP_BIOFILL, &s.ops_request);
- set_bit(STRIPE_BIOFILL_RUN, &sh->state);
- }
-
- pr_debug("locked=%d uptodate=%d to_read=%d"
- " to_write=%d failed=%d failed_num=%d\n",
- s.locked, s.uptodate, s.to_read, s.to_write,
- s.failed, s.failed_num);
- /* check if the array has lost two devices and, if so, some requests might
- * need to be failed
- */
- if (s.failed > 1 && s.to_read+s.to_write+s.written)
- handle_failed_stripe(conf, sh, &s, disks, &return_bi);
- if (s.failed > 1 && s.syncing) {
- md_done_sync(conf->mddev, STRIPE_SECTORS,0);
- clear_bit(STRIPE_SYNCING, &sh->state);
- s.syncing = 0;
- }
-
- /* might be able to return some write requests if the parity block
- * is safe, or on a failed drive
- */
- dev = &sh->dev[sh->pd_idx];
- if ( s.written &&
- ((test_bit(R5_Insync, &dev->flags) &&
- !test_bit(R5_LOCKED, &dev->flags) &&
- test_bit(R5_UPTODATE, &dev->flags)) ||
- (s.failed == 1 && s.failed_num == sh->pd_idx)))
- handle_stripe_clean_event(conf, sh, disks, &return_bi);
-
- /* Now we might consider reading some blocks, either to check/generate
- * parity, or to satisfy requests
- * or to load a block that is being partially written.
- */
- if (s.to_read || s.non_overwrite ||
- (s.syncing && (s.uptodate + s.compute < disks)) || s.expanding)
- handle_stripe_fill5(sh, &s, disks);
-
- /* Now we check to see if any write operations have recently
- * completed
- */
- prexor = 0;
- if (sh->reconstruct_state == reconstruct_state_prexor_drain_result)
- prexor = 1;
- if (sh->reconstruct_state == reconstruct_state_drain_result ||
- sh->reconstruct_state == reconstruct_state_prexor_drain_result) {
- sh->reconstruct_state = reconstruct_state_idle;
-
- /* All the 'written' buffers and the parity block are ready to
- * be written back to disk
- */
- BUG_ON(!test_bit(R5_UPTODATE, &sh->dev[sh->pd_idx].flags));
- for (i = disks; i--; ) {
- dev = &sh->dev[i];
- if (test_bit(R5_LOCKED, &dev->flags) &&
- (i == sh->pd_idx || dev->written)) {
- pr_debug("Writing block %d\n", i);
- set_bit(R5_Wantwrite, &dev->flags);
- if (prexor)
- continue;
- if (!test_bit(R5_Insync, &dev->flags) ||
- (i == sh->pd_idx && s.failed == 0))
- set_bit(STRIPE_INSYNC, &sh->state);
- }
- }
- if (test_and_clear_bit(STRIPE_PREREAD_ACTIVE, &sh->state))
- dec_preread_active = 1;
- }
-
- /* Now to consider new write requests and what else, if anything
- * should be read. We do not handle new writes when:
- * 1/ A 'write' operation (copy+xor) is already in flight.
- * 2/ A 'check' operation is in flight, as it may clobber the parity
- * block.
- */
- if (s.to_write && !sh->reconstruct_state && !sh->check_state)
- handle_stripe_dirtying5(conf, sh, &s, disks);
-
- /* maybe we need to check and possibly fix the parity for this stripe
- * Any reads will already have been scheduled, so we just see if enough
- * data is available. The parity check is held off while parity
- * dependent operations are in flight.
- */
- if (sh->check_state ||
- (s.syncing && s.locked == 0 &&
- !test_bit(STRIPE_COMPUTE_RUN, &sh->state) &&
- !test_bit(STRIPE_INSYNC, &sh->state)))
- handle_parity_checks5(conf, sh, &s, disks);
-
- if (s.syncing && s.locked == 0 && test_bit(STRIPE_INSYNC, &sh->state)) {
- md_done_sync(conf->mddev, STRIPE_SECTORS,1);
- clear_bit(STRIPE_SYNCING, &sh->state);
- }
-
- /* If the failed drive is just a ReadError, then we might need to progress
- * the repair/check process
- */
- if (s.failed == 1 && !conf->mddev->ro &&
- test_bit(R5_ReadError, &sh->dev[s.failed_num].flags)
- && !test_bit(R5_LOCKED, &sh->dev[s.failed_num].flags)
- && test_bit(R5_UPTODATE, &sh->dev[s.failed_num].flags)
- ) {
- dev = &sh->dev[s.failed_num];
- if (!test_bit(R5_ReWrite, &dev->flags)) {
- set_bit(R5_Wantwrite, &dev->flags);
- set_bit(R5_ReWrite, &dev->flags);
- set_bit(R5_LOCKED, &dev->flags);
- s.locked++;
- } else {
- /* let's read it back */
- set_bit(R5_Wantread, &dev->flags);
- set_bit(R5_LOCKED, &dev->flags);
- s.locked++;
- }
- }
-
- /* Finish reconstruct operations initiated by the expansion process */
- if (sh->reconstruct_state == reconstruct_state_result) {
- struct stripe_head *sh2
- = get_active_stripe(conf, sh->sector, 1, 1, 1);
- if (sh2 && test_bit(STRIPE_EXPAND_SOURCE, &sh2->state)) {
- /* sh cannot be written until sh2 has been read.
- * so arrange for sh to be delayed a little
- */
- set_bit(STRIPE_DELAYED, &sh->state);
- set_bit(STRIPE_HANDLE, &sh->state);
- if (!test_and_set_bit(STRIPE_PREREAD_ACTIVE,
- &sh2->state))
- atomic_inc(&conf->preread_active_stripes);
- release_stripe(sh2);
- goto unlock;
- }
- if (sh2)
- release_stripe(sh2);
-
- sh->reconstruct_state = reconstruct_state_idle;
- clear_bit(STRIPE_EXPANDING, &sh->state);
- for (i = conf->raid_disks; i--; ) {
- set_bit(R5_Wantwrite, &sh->dev[i].flags);
- set_bit(R5_LOCKED, &sh->dev[i].flags);
- s.locked++;
- }
- }
-
- if (s.expanded && test_bit(STRIPE_EXPANDING, &sh->state) &&
- !sh->reconstruct_state) {
- /* Need to write out all blocks after computing parity */
- sh->disks = conf->raid_disks;
- stripe_set_idx(sh->sector, conf, 0, sh);
- schedule_reconstruction(sh, &s, 1, 1);
- } else if (s.expanded && !sh->reconstruct_state && s.locked == 0) {
- clear_bit(STRIPE_EXPAND_READY, &sh->state);
- atomic_dec(&conf->reshape_stripes);
- wake_up(&conf->wait_for_overlap);
- md_done_sync(conf->mddev, STRIPE_SECTORS, 1);
- }
-
- if (s.expanding && s.locked == 0 &&
- !test_bit(STRIPE_COMPUTE_RUN, &sh->state))
- handle_stripe_expansion(conf, sh, NULL);
-
- unlock:
- spin_unlock(&sh->lock);
-
- /* wait for this device to become unblocked */
- if (unlikely(blocked_rdev))
- md_wait_for_blocked_rdev(blocked_rdev, conf->mddev);
-
- if (s.ops_request)
- raid_run_ops(sh, s.ops_request);
-
- ops_run_io(sh, &s);
-
- if (dec_preread_active) {
- /* We delay this until after ops_run_io so that if make_request
- * is waiting on a flush, it won't continue until the writes
- * have actually been submitted.
- */
- atomic_dec(&conf->preread_active_stripes);
- if (atomic_read(&conf->preread_active_stripes) <
- IO_THRESHOLD)
- md_wakeup_thread(conf->mddev->thread);
- }
- return_io(return_bi);
}
-static void handle_stripe6(struct stripe_head *sh)
+static void handle_stripe(struct stripe_head *sh)
{
+ struct stripe_head_state s;
raid5_conf_t *conf = sh->raid_conf;
+ int i;
+ int prexor;
int disks = sh->disks;
- struct bio *return_bi = NULL;
- int i, pd_idx = sh->pd_idx, qd_idx = sh->qd_idx;
- struct stripe_head_state s;
- struct r6_state r6s;
- struct r5dev *dev, *pdev, *qdev;
- mdk_rdev_t *blocked_rdev = NULL;
- int dec_preread_active = 0;
+ struct r5dev *pdev, *qdev;
+
+ clear_bit(STRIPE_HANDLE, &sh->state);
+ if (test_and_set_bit(STRIPE_ACTIVE, &sh->state)) {
+ /* already being handled, ensure it gets handled
+ * again when current action finishes */
+ set_bit(STRIPE_HANDLE, &sh->state);
+ return;
+ }
+
+ if (test_and_clear_bit(STRIPE_SYNC_REQUESTED, &sh->state)) {
+ set_bit(STRIPE_SYNCING, &sh->state);
+ clear_bit(STRIPE_INSYNC, &sh->state);
+ }
+ clear_bit(STRIPE_DELAYED, &sh->state);
pr_debug("handling stripe %llu, state=%#lx cnt=%d, "
"pd_idx=%d, qd_idx=%d\n, check:%d, reconstruct:%d\n",
(unsigned long long)sh->sector, sh->state,
- atomic_read(&sh->count), pd_idx, qd_idx,
+ atomic_read(&sh->count), sh->pd_idx, sh->qd_idx,
sh->check_state, sh->reconstruct_state);
- memset(&s, 0, sizeof(s));
-
- spin_lock(&sh->lock);
- clear_bit(STRIPE_HANDLE, &sh->state);
- clear_bit(STRIPE_DELAYED, &sh->state);
-
- s.syncing = test_bit(STRIPE_SYNCING, &sh->state);
- s.expanding = test_bit(STRIPE_EXPAND_SOURCE, &sh->state);
- s.expanded = test_bit(STRIPE_EXPAND_READY, &sh->state);
- /* Now to look around and see what can be done */
-
- rcu_read_lock();
- for (i=disks; i--; ) {
- mdk_rdev_t *rdev;
- dev = &sh->dev[i];
- pr_debug("check %d: state 0x%lx read %p write %p written %p\n",
- i, dev->flags, dev->toread, dev->towrite, dev->written);
- /* maybe we can reply to a read
- *
- * new wantfill requests are only permitted while
- * ops_complete_biofill is guaranteed to be inactive
- */
- if (test_bit(R5_UPTODATE, &dev->flags) && dev->toread &&
- !test_bit(STRIPE_BIOFILL_RUN, &sh->state))
- set_bit(R5_Wantfill, &dev->flags);
+ analyse_stripe(sh, &s);
- /* now count some things */
- if (test_bit(R5_LOCKED, &dev->flags)) s.locked++;
- if (test_bit(R5_UPTODATE, &dev->flags)) s.uptodate++;
- if (test_bit(R5_Wantcompute, &dev->flags)) {
- s.compute++;
- BUG_ON(s.compute > 2);
- }
-
- if (test_bit(R5_Wantfill, &dev->flags)) {
- s.to_fill++;
- } else if (dev->toread)
- s.to_read++;
- if (dev->towrite) {
- s.to_write++;
- if (!test_bit(R5_OVERWRITE, &dev->flags))
- s.non_overwrite++;
- }
- if (dev->written)
- s.written++;
- rdev = rcu_dereference(conf->disks[i].rdev);
- if (blocked_rdev == NULL &&
- rdev && unlikely(test_bit(Blocked, &rdev->flags))) {
- blocked_rdev = rdev;
- atomic_inc(&rdev->nr_pending);
- }
- clear_bit(R5_Insync, &dev->flags);
- if (!rdev)
- /* Not in-sync */;
- else if (test_bit(In_sync, &rdev->flags))
- set_bit(R5_Insync, &dev->flags);
- else {
- /* in sync if before recovery_offset */
- if (sh->sector + STRIPE_SECTORS <= rdev->recovery_offset)
- set_bit(R5_Insync, &dev->flags);
- }
- if (!test_bit(R5_Insync, &dev->flags)) {
- /* The ReadError flag will just be confusing now */
- clear_bit(R5_ReadError, &dev->flags);
- clear_bit(R5_ReWrite, &dev->flags);
- }
- if (test_bit(R5_ReadError, &dev->flags))
- clear_bit(R5_Insync, &dev->flags);
- if (!test_bit(R5_Insync, &dev->flags)) {
- if (s.failed < 2)
- r6s.failed_num[s.failed] = i;
- s.failed++;
- }
+ if (s.handle_bad_blocks) {
+ set_bit(STRIPE_HANDLE, &sh->state);
+ goto finish;
}
- rcu_read_unlock();
- if (unlikely(blocked_rdev)) {
+ if (unlikely(s.blocked_rdev)) {
if (s.syncing || s.expanding || s.expanded ||
s.to_write || s.written) {
set_bit(STRIPE_HANDLE, &sh->state);
- goto unlock;
+ goto finish;
}
/* There is nothing for the blocked_rdev to block */
- rdev_dec_pending(blocked_rdev, conf->mddev);
- blocked_rdev = NULL;
+ rdev_dec_pending(s.blocked_rdev, conf->mddev);
+ s.blocked_rdev = NULL;
}
if (s.to_fill && !test_bit(STRIPE_BIOFILL_RUN, &sh->state)) {
pr_debug("locked=%d uptodate=%d to_read=%d"
" to_write=%d failed=%d failed_num=%d,%d\n",
s.locked, s.uptodate, s.to_read, s.to_write, s.failed,
- r6s.failed_num[0], r6s.failed_num[1]);
- /* check if the array has lost >2 devices and, if so, some requests
- * might need to be failed
+ s.failed_num[0], s.failed_num[1]);
+ /* check if the array has lost more than max_degraded devices and,
+ * if so, some requests might need to be failed.
*/
- if (s.failed > 2 && s.to_read+s.to_write+s.written)
- handle_failed_stripe(conf, sh, &s, disks, &return_bi);
- if (s.failed > 2 && s.syncing) {
- md_done_sync(conf->mddev, STRIPE_SECTORS,0);
- clear_bit(STRIPE_SYNCING, &sh->state);
- s.syncing = 0;
- }
+ if (s.failed > conf->max_degraded && s.to_read+s.to_write+s.written)
+ handle_failed_stripe(conf, sh, &s, disks, &s.return_bi);
+ if (s.failed > conf->max_degraded && s.syncing)
+ handle_failed_sync(conf, sh, &s);
/*
* might be able to return some write requests if the parity blocks
* are safe, or on a failed drive
*/
- pdev = &sh->dev[pd_idx];
- r6s.p_failed = (s.failed >= 1 && r6s.failed_num[0] == pd_idx)
- || (s.failed >= 2 && r6s.failed_num[1] == pd_idx);
- qdev = &sh->dev[qd_idx];
- r6s.q_failed = (s.failed >= 1 && r6s.failed_num[0] == qd_idx)
- || (s.failed >= 2 && r6s.failed_num[1] == qd_idx);
-
- if ( s.written &&
- ( r6s.p_failed || ((test_bit(R5_Insync, &pdev->flags)
+ pdev = &sh->dev[sh->pd_idx];
+ s.p_failed = (s.failed >= 1 && s.failed_num[0] == sh->pd_idx)
+ || (s.failed >= 2 && s.failed_num[1] == sh->pd_idx);
+ qdev = &sh->dev[sh->qd_idx];
+ s.q_failed = (s.failed >= 1 && s.failed_num[0] == sh->qd_idx)
+ || (s.failed >= 2 && s.failed_num[1] == sh->qd_idx)
+ || conf->level < 6;
+
+ if (s.written &&
+ (s.p_failed || ((test_bit(R5_Insync, &pdev->flags)
&& !test_bit(R5_LOCKED, &pdev->flags)
&& test_bit(R5_UPTODATE, &pdev->flags)))) &&
- ( r6s.q_failed || ((test_bit(R5_Insync, &qdev->flags)
+ (s.q_failed || ((test_bit(R5_Insync, &qdev->flags)
&& !test_bit(R5_LOCKED, &qdev->flags)
&& test_bit(R5_UPTODATE, &qdev->flags)))))
- handle_stripe_clean_event(conf, sh, disks, &return_bi);
+ handle_stripe_clean_event(conf, sh, disks, &s.return_bi);
/* Now we might consider reading some blocks, either to check/generate
* parity, or to satisfy requests
* or to load a block that is being partially written.
*/
- if (s.to_read || s.non_overwrite || (s.to_write && s.failed) ||
- (s.syncing && (s.uptodate + s.compute < disks)) || s.expanding)
- handle_stripe_fill6(sh, &s, &r6s, disks);
+ if (s.to_read || s.non_overwrite
+ || (conf->level == 6 && s.to_write && s.failed)
+ || (s.syncing && (s.uptodate + s.compute < disks)) || s.expanding)
+ handle_stripe_fill(sh, &s, disks);
/* Now we check to see if any write operations have recently
* completed
*/
- if (sh->reconstruct_state == reconstruct_state_drain_result) {
-
+ prexor = 0;
+ if (sh->reconstruct_state == reconstruct_state_prexor_drain_result)
+ prexor = 1;
+ if (sh->reconstruct_state == reconstruct_state_drain_result ||
+ sh->reconstruct_state == reconstruct_state_prexor_drain_result) {
sh->reconstruct_state = reconstruct_state_idle;
- /* All the 'written' buffers and the parity blocks are ready to
+
+ /* All the 'written' buffers and the parity block are ready to
* be written back to disk
*/
BUG_ON(!test_bit(R5_UPTODATE, &sh->dev[sh->pd_idx].flags));
- BUG_ON(!test_bit(R5_UPTODATE, &sh->dev[qd_idx].flags));
+ BUG_ON(sh->qd_idx >= 0 &&
+ !test_bit(R5_UPTODATE, &sh->dev[sh->qd_idx].flags));
for (i = disks; i--; ) {
- dev = &sh->dev[i];
+ struct r5dev *dev = &sh->dev[i];
if (test_bit(R5_LOCKED, &dev->flags) &&
- (i == sh->pd_idx || i == qd_idx ||
- dev->written)) {
+ (i == sh->pd_idx || i == sh->qd_idx ||
+ dev->written)) {
pr_debug("Writing block %d\n", i);
- BUG_ON(!test_bit(R5_UPTODATE, &dev->flags));
set_bit(R5_Wantwrite, &dev->flags);
+ if (prexor)
+ continue;
if (!test_bit(R5_Insync, &dev->flags) ||
- ((i == sh->pd_idx || i == qd_idx) &&
- s.failed == 0))
+ ((i == sh->pd_idx || i == sh->qd_idx) &&
+ s.failed == 0))
set_bit(STRIPE_INSYNC, &sh->state);
}
}
if (test_and_clear_bit(STRIPE_PREREAD_ACTIVE, &sh->state))
- dec_preread_active = 1;
+ s.dec_preread_active = 1;
}
/* Now to consider new write requests and what else, if anything
* should be read. We do not handle new writes when:
- * 1/ A 'write' operation (copy+gen_syndrome) is already in flight.
+ * 1/ A 'write' operation (copy+xor) is already in flight.
* 2/ A 'check' operation is in flight, as it may clobber the parity
* block.
*/
if (s.to_write && !sh->reconstruct_state && !sh->check_state)
- handle_stripe_dirtying6(conf, sh, &s, &r6s, disks);
+ handle_stripe_dirtying(conf, sh, &s, disks);
/* maybe we need to check and possibly fix the parity for this stripe
* Any reads will already have been scheduled, so we just see if enough
if (sh->check_state ||
(s.syncing && s.locked == 0 &&
!test_bit(STRIPE_COMPUTE_RUN, &sh->state) &&
- !test_bit(STRIPE_INSYNC, &sh->state)))
- handle_parity_checks6(conf, sh, &s, &r6s, disks);
+ !test_bit(STRIPE_INSYNC, &sh->state))) {
+ if (conf->level == 6)
+ handle_parity_checks6(conf, sh, &s, disks);
+ else
+ handle_parity_checks5(conf, sh, &s, disks);
+ }
if (s.syncing && s.locked == 0 && test_bit(STRIPE_INSYNC, &sh->state)) {
- md_done_sync(conf->mddev, STRIPE_SECTORS,1);
+ md_done_sync(conf->mddev, STRIPE_SECTORS, 1);
clear_bit(STRIPE_SYNCING, &sh->state);
}
/* If the failed drives are just a ReadError, then we might need
* to progress the repair/check process
*/
- if (s.failed <= 2 && !conf->mddev->ro)
+ if (s.failed <= conf->max_degraded && !conf->mddev->ro)
for (i = 0; i < s.failed; i++) {
- dev = &sh->dev[r6s.failed_num[i]];
+ struct r5dev *dev = &sh->dev[s.failed_num[i]];
if (test_bit(R5_ReadError, &dev->flags)
&& !test_bit(R5_LOCKED, &dev->flags)
&& test_bit(R5_UPTODATE, &dev->flags)
}
}
+
/* Finish reconstruct operations initiated by the expansion process */
if (sh->reconstruct_state == reconstruct_state_result) {
+ struct stripe_head *sh_src
+ = get_active_stripe(conf, sh->sector, 1, 1, 1);
+ if (sh_src && test_bit(STRIPE_EXPAND_SOURCE, &sh_src->state)) {
+ /* sh cannot be written until sh_src has been read.
+ * so arrange for sh to be delayed a little
+ */
+ set_bit(STRIPE_DELAYED, &sh->state);
+ set_bit(STRIPE_HANDLE, &sh->state);
+ if (!test_and_set_bit(STRIPE_PREREAD_ACTIVE,
+ &sh_src->state))
+ atomic_inc(&conf->preread_active_stripes);
+ release_stripe(sh_src);
+ goto finish;
+ }
+ if (sh_src)
+ release_stripe(sh_src);
+
sh->reconstruct_state = reconstruct_state_idle;
clear_bit(STRIPE_EXPANDING, &sh->state);
for (i = conf->raid_disks; i--; ) {
if (s.expanded && test_bit(STRIPE_EXPANDING, &sh->state) &&
!sh->reconstruct_state) {
- struct stripe_head *sh2
- = get_active_stripe(conf, sh->sector, 1, 1, 1);
- if (sh2 && test_bit(STRIPE_EXPAND_SOURCE, &sh2->state)) {
- /* sh cannot be written until sh2 has been read.
- * so arrange for sh to be delayed a little
- */
- set_bit(STRIPE_DELAYED, &sh->state);
- set_bit(STRIPE_HANDLE, &sh->state);
- if (!test_and_set_bit(STRIPE_PREREAD_ACTIVE,
- &sh2->state))
- atomic_inc(&conf->preread_active_stripes);
- release_stripe(sh2);
- goto unlock;
- }
- if (sh2)
- release_stripe(sh2);
-
- /* Need to write out all blocks after computing P&Q */
+ /* Need to write out all blocks after computing parity */
sh->disks = conf->raid_disks;
stripe_set_idx(sh->sector, conf, 0, sh);
schedule_reconstruction(sh, &s, 1, 1);
if (s.expanding && s.locked == 0 &&
!test_bit(STRIPE_COMPUTE_RUN, &sh->state))
- handle_stripe_expansion(conf, sh, &r6s);
-
- unlock:
- spin_unlock(&sh->lock);
+ handle_stripe_expansion(conf, sh);
+finish:
/* wait for this device to become unblocked */
- if (unlikely(blocked_rdev))
- md_wait_for_blocked_rdev(blocked_rdev, conf->mddev);
+ if (unlikely(s.blocked_rdev))
+ md_wait_for_blocked_rdev(s.blocked_rdev, conf->mddev);
+
+ if (s.handle_bad_blocks)
+ for (i = disks; i--; ) {
+ mdk_rdev_t *rdev;
+ struct r5dev *dev = &sh->dev[i];
+ if (test_and_clear_bit(R5_WriteError, &dev->flags)) {
+ /* We own a safe reference to the rdev */
+ rdev = conf->disks[i].rdev;
+ if (!rdev_set_badblocks(rdev, sh->sector,
+ STRIPE_SECTORS, 0))
+ md_error(conf->mddev, rdev);
+ rdev_dec_pending(rdev, conf->mddev);
+ }
+ if (test_and_clear_bit(R5_MadeGood, &dev->flags)) {
+ rdev = conf->disks[i].rdev;
+ rdev_clear_badblocks(rdev, sh->sector,
+ STRIPE_SECTORS);
+ rdev_dec_pending(rdev, conf->mddev);
+ }
+ }
if (s.ops_request)
raid_run_ops(sh, s.ops_request);
ops_run_io(sh, &s);
-
- if (dec_preread_active) {
+ if (s.dec_preread_active) {
/* We delay this until after ops_run_io so that if make_request
* is waiting on a flush, it won't continue until the writes
* have actually been submitted.
md_wakeup_thread(conf->mddev->thread);
}
- return_io(return_bi);
-}
+ return_io(s.return_bi);
-static void handle_stripe(struct stripe_head *sh)
-{
- if (sh->raid_conf->level == 6)
- handle_stripe6(sh);
- else
- handle_stripe5(sh);
+ clear_bit(STRIPE_ACTIVE, &sh->state);
}
static void raid5_activate_delayed(raid5_conf_t *conf)
rcu_read_lock();
rdev = rcu_dereference(conf->disks[dd_idx].rdev);
if (rdev && test_bit(In_sync, &rdev->flags)) {
+ sector_t first_bad;
+ int bad_sectors;
+
atomic_inc(&rdev->nr_pending);
rcu_read_unlock();
raid_bio->bi_next = (void*)rdev;
align_bi->bi_flags &= ~(1 << BIO_SEG_VALID);
align_bi->bi_sector += rdev->data_offset;
- if (!bio_fits_rdev(align_bi)) {
- /* too big in some way */
+ if (!bio_fits_rdev(align_bi) ||
+ is_badblock(rdev, align_bi->bi_sector, align_bi->bi_size>>9,
+ &first_bad, &bad_sectors)) {
+ /* too big in some way, or has a known bad block */
bio_put(align_bi);
rdev_dec_pending(rdev, mddev);
return 0;
}
}
- if (bio_data_dir(bi) == WRITE &&
+ if (rw == WRITE &&
logical_sector >= mddev->suspend_lo &&
logical_sector < mddev->suspend_hi) {
release_stripe(sh);
}
if (test_bit(STRIPE_EXPANDING, &sh->state) ||
- !add_stripe_bio(sh, bi, dd_idx, (bi->bi_rw&RW_MASK))) {
+ !add_stripe_bio(sh, bi, dd_idx, rw)) {
/* Stripe is busy expanding or
* add failed due to overlap. Flush everything
* and wait a while
bitmap_start_sync(mddev->bitmap, sector_nr, &sync_blocks, still_degraded);
- spin_lock(&sh->lock);
- set_bit(STRIPE_SYNCING, &sh->state);
- clear_bit(STRIPE_INSYNC, &sh->state);
- spin_unlock(&sh->lock);
+ set_bit(STRIPE_SYNC_REQUESTED, &sh->state);
handle_stripe(sh);
release_stripe(sh);
release_stripe(sh);
cond_resched();
+ if (mddev->flags & ~(1<<MD_CHANGE_PENDING))
+ md_check_recovery(mddev);
+
spin_lock_irq(&conf->device_lock);
}
pr_debug("%d stripes handled\n", handled);
* isn't possible.
*/
if (!test_bit(Faulty, &rdev->flags) &&
+ mddev->recovery_disabled != conf->recovery_disabled &&
!has_failed(conf) &&
number < conf->raid_disks) {
err = -EBUSY;
int first = 0;
int last = conf->raid_disks - 1;
+ if (mddev->recovery_disabled == conf->recovery_disabled)
+ return -EBUSY;
+
if (has_failed(conf))
/* no point adding a device */
return -EINVAL;
if (rdev->raid_disk < 0 &&
!test_bit(Faulty, &rdev->flags)) {
if (raid5_add_disk(mddev, rdev) == 0) {
- char nm[20];
if (rdev->raid_disk
>= conf->previous_raid_disks) {
set_bit(In_sync, &rdev->flags);
added_devices++;
} else
rdev->recovery_offset = 0;
- sprintf(nm, "rd%d", rdev->raid_disk);
- if (sysfs_create_link(&mddev->kobj,
- &rdev->kobj, nm))
+
+ if (sysfs_link_rdev(mddev, rdev))
/* Failure here is OK */;
}
} else if (rdev->raid_disk >= conf->previous_raid_disks
d++) {
mdk_rdev_t *rdev = conf->disks[d].rdev;
if (rdev && raid5_remove_disk(mddev, d) == 0) {
- char nm[20];
- sprintf(nm, "rd%d", rdev->raid_disk);
- sysfs_remove_link(&mddev->kobj, nm);
+ sysfs_unlink_rdev(mddev, rdev);
rdev->raid_disk = -1;
}
}
/*
*
- * Each stripe contains one buffer per disc. Each buffer can be in
+ * Each stripe contains one buffer per device. Each buffer can be in
* one of a number of states stored in "flags". Changes between
- * these states happen *almost* exclusively under a per-stripe
- * spinlock. Some very specific changes can happen in bi_end_io, and
- * these are not protected by the spin lock.
+ * these states happen *almost* exclusively under the protection of the
+ * STRIPE_ACTIVE flag. Some very specific changes can happen in bi_end_io, and
+ * these are not protected by STRIPE_ACTIVE.
*
* The flag bits that are used to represent these states are:
* R5_UPTODATE and R5_LOCKED
* block and the cached buffer are successfully written, any buffer on
* a written list can be returned with b_end_io.
*
- * The write list and read list both act as fifos. The read list is
- * protected by the device_lock. The write and written lists are
- * protected by the stripe lock. The device_lock, which can be
- * claimed while the stipe lock is held, is only for list
- * manipulations and will only be held for a very short time. It can
- * be claimed from interrupts.
+ * The write list and read list both act as fifos. The read list,
+ * write list and written list are protected by the device_lock.
+ * The device_lock is only for list manipulations and will only be
+ * held for a very short time. It can be claimed from interrupts.
*
*
* Stripes in the stripe cache can be on one of two lists (or on
*
* The inactive_list, handle_list and hash bucket lists are all protected by the
* device_lock.
- * - stripes on the inactive_list never have their stripe_lock held.
* - stripes have a reference counter. If count==0, they are on a list.
* - If a stripe might need handling, STRIPE_HANDLE is set.
* - When refcount reaches zero, then if STRIPE_HANDLE it is put on
* attach a request to an active stripe (add_stripe_bh())
* lockdev attach-buffer unlockdev
* handle a stripe (handle_stripe())
- * lockstripe clrSTRIPE_HANDLE ...
+ * setSTRIPE_ACTIVE, clrSTRIPE_HANDLE ...
* (lockdev check-buffers unlockdev) ..
* change-state ..
- * record io/ops needed unlockstripe schedule io/ops
+ * record io/ops needed clearSTRIPE_ACTIVE schedule io/ops
* release an active stripe (release_stripe())
* lockdev if (!--cnt) { if STRIPE_HANDLE, add to handle_list else add to inactive-list } unlockdev
*
* on a cached buffer, and plus one if the stripe is undergoing stripe
* operations.
*
- * Stripe operations are performed outside the stripe lock,
- * the stripe operations are:
+ * The stripe operations are:
* -copying data between the stripe cache and user application buffers
* -computing blocks to save a disk access, or to recover a missing block
* -updating the parity on a write operation (reconstruct write and
*/
/*
- * Operations state - intermediate states that are visible outside of sh->lock
+ * Operations state - intermediate states that are visible outside of
+ * STRIPE_ACTIVE.
* In general _idle indicates nothing is running, _run indicates a data
* processing operation is active, and _result means the data processing result
* is stable and can be acted upon. For simple operations like biofill and
short ddf_layout;/* use DDF ordering to calculate Q */
unsigned long state; /* state flags */
atomic_t count; /* nr of active thread/requests */
- spinlock_t lock;
int bm_seq; /* sequence number for bitmap flushes */
int disks; /* disks in stripe */
enum check_states check_state;
};
/* stripe_head_state - collects and tracks the dynamic state of a stripe_head
- * for handle_stripe. It is only valid under spin_lock(sh->lock);
+ * for handle_stripe.
*/
struct stripe_head_state {
int syncing, expanding, expanded;
int locked, uptodate, to_read, to_write, failed, written;
int to_fill, compute, req_compute, non_overwrite;
- int failed_num;
+ int failed_num[2];
+ int p_failed, q_failed;
+ int dec_preread_active;
unsigned long ops_request;
-};
-/* r6_state - extra state data only relevant to r6 */
-struct r6_state {
- int p_failed, q_failed, failed_num[2];
+ struct bio *return_bi;
+ mdk_rdev_t *blocked_rdev;
+ int handle_bad_blocks;
};
/* Flags */
#define R5_ReWrite 9 /* have tried to over-write the readerror */
#define R5_Expanded 10 /* This block now has post-expand data */
-#define R5_Wantcompute 11 /* compute_block in progress treat as
- * uptodate
- */
-#define R5_Wantfill 12 /* dev->toread contains a bio that needs
- * filling
- */
-#define R5_Wantdrain 13 /* dev->towrite needs to be drained */
-#define R5_WantFUA 14 /* Write should be FUA */
+#define R5_Wantcompute 11 /* compute_block in progress treat as
+ * uptodate
+ */
+#define R5_Wantfill 12 /* dev->toread contains a bio that needs
+ * filling
+ */
+#define R5_Wantdrain 13 /* dev->towrite needs to be drained */
+#define R5_WantFUA 14 /* Write should be FUA */
+#define R5_WriteError 15 /* got a write error - need to record it */
+#define R5_MadeGood 16 /* A bad block has been fixed by writing to it*/
/*
* Write method
*/
/*
* Stripe state
*/
-#define STRIPE_HANDLE 2
-#define STRIPE_SYNCING 3
-#define STRIPE_INSYNC 4
-#define STRIPE_PREREAD_ACTIVE 5
-#define STRIPE_DELAYED 6
-#define STRIPE_DEGRADED 7
-#define STRIPE_BIT_DELAY 8
-#define STRIPE_EXPANDING 9
-#define STRIPE_EXPAND_SOURCE 10
-#define STRIPE_EXPAND_READY 11
-#define STRIPE_IO_STARTED 12 /* do not count towards 'bypass_count' */
-#define STRIPE_FULL_WRITE 13 /* all blocks are set to be overwritten */
-#define STRIPE_BIOFILL_RUN 14
-#define STRIPE_COMPUTE_RUN 15
-#define STRIPE_OPS_REQ_PENDING 16
+enum {
+ STRIPE_ACTIVE,
+ STRIPE_HANDLE,
+ STRIPE_SYNC_REQUESTED,
+ STRIPE_SYNCING,
+ STRIPE_INSYNC,
+ STRIPE_PREREAD_ACTIVE,
+ STRIPE_DELAYED,
+ STRIPE_DEGRADED,
+ STRIPE_BIT_DELAY,
+ STRIPE_EXPANDING,
+ STRIPE_EXPAND_SOURCE,
+ STRIPE_EXPAND_READY,
+ STRIPE_IO_STARTED, /* do not count towards 'bypass_count' */
+ STRIPE_FULL_WRITE, /* all blocks are set to be overwritten */
+ STRIPE_BIOFILL_RUN,
+ STRIPE_COMPUTE_RUN,
+ STRIPE_OPS_REQ_PENDING,
+};
/*
* Operation request flags
* PREREAD_ACTIVE.
* In stripe_handle, if we find pre-reading is necessary, we do it if
* PREREAD_ACTIVE is set, else we set DELAYED which will send it to the delayed queue.
- * HANDLE gets cleared if stripe_handle leave nothing locked.
+ * HANDLE gets cleared if stripe_handle leaves nothing locked.
*/
* (fresh device added).
* Cleared when a sync completes.
*/
-
+ int recovery_disabled;
/* per cpu variables */
struct raid5_percpu {
struct page *spare_page; /* Used when checking P/Q in raid6 */
__u8 device_uuid[16]; /* user-space setable, ignored by kernel */
__u8 devflags; /* per-device flags. Only one defined...*/
#define WriteMostly1 1 /* mask for writemostly flag in above */
- __u8 pad2[64-57]; /* set to 0 when writing */
+ /* Bad block log. If there are any bad blocks the feature flag is set.
+ * If offset and size are non-zero, that space is reserved and available
+ */
+ __u8 bblog_shift; /* shift from sectors to block size */
+ __le16 bblog_size; /* number of sectors reserved for list */
+ __le32 bblog_offset; /* sector offset from superblock to bblog,
+ * signed - not unsigned */
/* array state information - 64 bytes */
- __le64 utime; /* 40 bits second, 24 btes microseconds */
+ __le64 utime; /* 40 bits second, 24 bits microseconds */
__le64 events; /* incremented when superblock updated */
__le64 resync_offset; /* data before this offset (from data_offset) known to be in sync */
__le32 sb_csum; /* checksum up to devs[max_dev] */
* must be honoured
*/
#define MD_FEATURE_RESHAPE_ACTIVE 4
+#define MD_FEATURE_BAD_BLOCKS 8 /* badblock list is not empty */
-#define MD_FEATURE_ALL (1|2|4)
+#define MD_FEATURE_ALL (1|2|4|8)
#endif
-
git.openpandora.org / pandora-kernel.git / commitdiff