#include <linux/sched.h>
#include <linux/bio.h>
#include <linux/buffer_head.h>
+#include <linux/blkdev.h>
+#include <linux/random.h>
#include <asm/div64.h>
#include "ctree.h"
#include "extent_map.h"
#include "transaction.h"
#include "print-tree.h"
#include "volumes.h"
-
-struct stripe {
- struct btrfs_device *dev;
- u64 physical;
-};
+#include "async-thread.h"
struct map_lookup {
u64 type;
int stripe_len;
int sector_size;
int num_stripes;
- struct stripe stripes[];
+ int sub_stripes;
+ struct btrfs_bio_stripe stripes[];
};
#define map_lookup_size(n) (sizeof(struct map_lookup) + \
- (sizeof(struct stripe) * (n)))
+ (sizeof(struct btrfs_bio_stripe) * (n)))
static DEFINE_MUTEX(uuid_mutex);
static LIST_HEAD(fs_uuids);
+void btrfs_lock_volumes(void)
+{
+ mutex_lock(&uuid_mutex);
+}
+
+void btrfs_unlock_volumes(void)
+{
+ mutex_unlock(&uuid_mutex);
+}
+
+static void lock_chunks(struct btrfs_root *root)
+{
+ mutex_lock(&root->fs_info->alloc_mutex);
+ mutex_lock(&root->fs_info->chunk_mutex);
+}
+
+static void unlock_chunks(struct btrfs_root *root)
+{
+ mutex_unlock(&root->fs_info->alloc_mutex);
+ mutex_unlock(&root->fs_info->chunk_mutex);
+}
+
int btrfs_cleanup_fs_uuids(void)
{
struct btrfs_fs_devices *fs_devices;
devices_cur = fs_devices->devices.next;
dev = list_entry(devices_cur, struct btrfs_device,
dev_list);
- printk("uuid cleanup finds %s\n", dev->name);
if (dev->bdev) {
- printk("closing\n");
close_bdev_excl(dev->bdev);
+ fs_devices->open_devices--;
}
list_del(&dev->dev_list);
+ kfree(dev->name);
kfree(dev);
}
}
return 0;
}
-static struct btrfs_device *__find_device(struct list_head *head, u64 devid)
+static struct btrfs_device *__find_device(struct list_head *head, u64 devid,
+ u8 *uuid)
{
struct btrfs_device *dev;
struct list_head *cur;
list_for_each(cur, head) {
dev = list_entry(cur, struct btrfs_device, dev_list);
- if (dev->devid == devid)
+ if (dev->devid == devid &&
+ (!uuid || !memcmp(dev->uuid, uuid, BTRFS_UUID_SIZE))) {
return dev;
+ }
}
return NULL;
}
return NULL;
}
+/*
+ * we try to collect pending bios for a device so we don't get a large
+ * number of procs sending bios down to the same device. This greatly
+ * improves the schedulers ability to collect and merge the bios.
+ *
+ * But, it also turns into a long list of bios to process and that is sure
+ * to eventually make the worker thread block. The solution here is to
+ * make some progress and then put this work struct back at the end of
+ * the list if the block device is congested. This way, multiple devices
+ * can make progress from a single worker thread.
+ */
+int run_scheduled_bios(struct btrfs_device *device)
+{
+ struct bio *pending;
+ struct backing_dev_info *bdi;
+ struct bio *tail;
+ struct bio *cur;
+ int again = 0;
+ unsigned long num_run = 0;
+
+ bdi = device->bdev->bd_inode->i_mapping->backing_dev_info;
+loop:
+ spin_lock(&device->io_lock);
+
+ /* take all the bios off the list at once and process them
+ * later on (without the lock held). But, remember the
+ * tail and other pointers so the bios can be properly reinserted
+ * into the list if we hit congestion
+ */
+ pending = device->pending_bios;
+ tail = device->pending_bio_tail;
+ WARN_ON(pending && !tail);
+ device->pending_bios = NULL;
+ device->pending_bio_tail = NULL;
+
+ /*
+ * if pending was null this time around, no bios need processing
+ * at all and we can stop. Otherwise it'll loop back up again
+ * and do an additional check so no bios are missed.
+ *
+ * device->running_pending is used to synchronize with the
+ * schedule_bio code.
+ */
+ if (pending) {
+ again = 1;
+ device->running_pending = 1;
+ } else {
+ again = 0;
+ device->running_pending = 0;
+ }
+ spin_unlock(&device->io_lock);
+
+ while(pending) {
+ cur = pending;
+ pending = pending->bi_next;
+ cur->bi_next = NULL;
+ atomic_dec(&device->dev_root->fs_info->nr_async_submits);
+ submit_bio(cur->bi_rw, cur);
+ num_run++;
+
+ /*
+ * we made progress, there is more work to do and the bdi
+ * is now congested. Back off and let other work structs
+ * run instead
+ */
+ if (pending && num_run && bdi_write_congested(bdi)) {
+ struct bio *old_head;
+
+ spin_lock(&device->io_lock);
+ old_head = device->pending_bios;
+ device->pending_bios = pending;
+ if (device->pending_bio_tail)
+ tail->bi_next = old_head;
+ else
+ device->pending_bio_tail = tail;
+
+ spin_unlock(&device->io_lock);
+ btrfs_requeue_work(&device->work);
+ goto done;
+ }
+ }
+ if (again)
+ goto loop;
+done:
+ return 0;
+}
+
+void pending_bios_fn(struct btrfs_work *work)
+{
+ struct btrfs_device *device;
+
+ device = container_of(work, struct btrfs_device, work);
+ run_scheduled_bios(device);
+}
+
static int device_list_add(const char *path,
struct btrfs_super_block *disk_super,
u64 devid, struct btrfs_fs_devices **fs_devices_ret)
fs_devices = find_fsid(disk_super->fsid);
if (!fs_devices) {
- fs_devices = kmalloc(sizeof(*fs_devices), GFP_NOFS);
+ fs_devices = kzalloc(sizeof(*fs_devices), GFP_NOFS);
if (!fs_devices)
return -ENOMEM;
INIT_LIST_HEAD(&fs_devices->devices);
+ INIT_LIST_HEAD(&fs_devices->alloc_list);
list_add(&fs_devices->list, &fs_uuids);
memcpy(fs_devices->fsid, disk_super->fsid, BTRFS_FSID_SIZE);
fs_devices->latest_devid = devid;
fs_devices->latest_trans = found_transid;
- fs_devices->lowest_devid = (u64)-1;
- fs_devices->num_devices = 0;
device = NULL;
} else {
- device = __find_device(&fs_devices->devices, devid);
+ device = __find_device(&fs_devices->devices, devid,
+ disk_super->dev_item.uuid);
}
if (!device) {
device = kzalloc(sizeof(*device), GFP_NOFS);
return -ENOMEM;
}
device->devid = devid;
+ device->work.func = pending_bios_fn;
+ memcpy(device->uuid, disk_super->dev_item.uuid,
+ BTRFS_UUID_SIZE);
+ device->barriers = 1;
+ spin_lock_init(&device->io_lock);
device->name = kstrdup(path, GFP_NOFS);
if (!device->name) {
kfree(device);
return -ENOMEM;
}
list_add(&device->dev_list, &fs_devices->devices);
+ list_add(&device->dev_alloc_list, &fs_devices->alloc_list);
fs_devices->num_devices++;
}
fs_devices->latest_devid = devid;
fs_devices->latest_trans = found_transid;
}
- if (fs_devices->lowest_devid > devid) {
- fs_devices->lowest_devid = devid;
- printk("lowest devid now %Lu\n", devid);
- }
*fs_devices_ret = fs_devices;
return 0;
}
+int btrfs_close_extra_devices(struct btrfs_fs_devices *fs_devices)
+{
+ struct list_head *head = &fs_devices->devices;
+ struct list_head *cur;
+ struct btrfs_device *device;
+
+ mutex_lock(&uuid_mutex);
+again:
+ list_for_each(cur, head) {
+ device = list_entry(cur, struct btrfs_device, dev_list);
+ if (!device->in_fs_metadata) {
+ struct block_device *bdev;
+ list_del(&device->dev_list);
+ list_del(&device->dev_alloc_list);
+ fs_devices->num_devices--;
+ if (device->bdev) {
+ bdev = device->bdev;
+ fs_devices->open_devices--;
+ mutex_unlock(&uuid_mutex);
+ close_bdev_excl(bdev);
+ mutex_lock(&uuid_mutex);
+ }
+ kfree(device->name);
+ kfree(device);
+ goto again;
+ }
+ }
+ mutex_unlock(&uuid_mutex);
+ return 0;
+}
+
int btrfs_close_devices(struct btrfs_fs_devices *fs_devices)
{
struct list_head *head = &fs_devices->devices;
device = list_entry(cur, struct btrfs_device, dev_list);
if (device->bdev) {
close_bdev_excl(device->bdev);
- printk("close devices closes %s\n", device->name);
+ fs_devices->open_devices--;
}
device->bdev = NULL;
+ device->in_fs_metadata = 0;
}
+ fs_devices->mounted = 0;
mutex_unlock(&uuid_mutex);
return 0;
}
struct list_head *head = &fs_devices->devices;
struct list_head *cur;
struct btrfs_device *device;
- int ret;
+ struct block_device *latest_bdev = NULL;
+ struct buffer_head *bh;
+ struct btrfs_super_block *disk_super;
+ u64 latest_devid = 0;
+ u64 latest_transid = 0;
+ u64 transid;
+ u64 devid;
+ int ret = 0;
mutex_lock(&uuid_mutex);
+ if (fs_devices->mounted)
+ goto out;
+
list_for_each(cur, head) {
device = list_entry(cur, struct btrfs_device, dev_list);
+ if (device->bdev)
+ continue;
+
+ if (!device->name)
+ continue;
+
bdev = open_bdev_excl(device->name, flags, holder);
-printk("opening %s devid %Lu\n", device->name, device->devid);
+
if (IS_ERR(bdev)) {
printk("open %s failed\n", device->name);
- ret = PTR_ERR(bdev);
- goto fail;
+ goto error;
}
- if (device->devid == fs_devices->latest_devid)
- fs_devices->latest_bdev = bdev;
- if (device->devid == fs_devices->lowest_devid) {
- fs_devices->lowest_bdev = bdev;
-printk("lowest bdev %s\n", device->name);
+ set_blocksize(bdev, 4096);
+
+ bh = __bread(bdev, BTRFS_SUPER_INFO_OFFSET / 4096, 4096);
+ if (!bh)
+ goto error_close;
+
+ disk_super = (struct btrfs_super_block *)bh->b_data;
+ if (strncmp((char *)(&disk_super->magic), BTRFS_MAGIC,
+ sizeof(disk_super->magic)))
+ goto error_brelse;
+
+ devid = le64_to_cpu(disk_super->dev_item.devid);
+ if (devid != device->devid)
+ goto error_brelse;
+
+ transid = btrfs_super_generation(disk_super);
+ if (!latest_transid || transid > latest_transid) {
+ latest_devid = devid;
+ latest_transid = transid;
+ latest_bdev = bdev;
}
+
device->bdev = bdev;
+ device->in_fs_metadata = 0;
+ fs_devices->open_devices++;
+ continue;
+
+error_brelse:
+ brelse(bh);
+error_close:
+ close_bdev_excl(bdev);
+error:
+ continue;
}
+ if (fs_devices->open_devices == 0) {
+ ret = -EIO;
+ goto out;
+ }
+ fs_devices->mounted = 1;
+ fs_devices->latest_bdev = latest_bdev;
+ fs_devices->latest_devid = latest_devid;
+ fs_devices->latest_trans = latest_transid;
+out:
mutex_unlock(&uuid_mutex);
- return 0;
-fail:
- mutex_unlock(&uuid_mutex);
- btrfs_close_devices(fs_devices);
return ret;
}
struct buffer_head *bh;
int ret;
u64 devid;
+ u64 transid;
mutex_lock(&uuid_mutex);
- printk("scan one opens %s\n", path);
bdev = open_bdev_excl(path, flags, holder);
if (IS_ERR(bdev)) {
- printk("open failed\n");
ret = PTR_ERR(bdev);
goto error;
}
disk_super = (struct btrfs_super_block *)bh->b_data;
if (strncmp((char *)(&disk_super->magic), BTRFS_MAGIC,
sizeof(disk_super->magic))) {
- printk("no btrfs found on %s\n", path);
- ret = -ENOENT;
+ ret = -EINVAL;
goto error_brelse;
}
devid = le64_to_cpu(disk_super->dev_item.devid);
- printk("found device %Lu on %s\n", devid, path);
+ transid = btrfs_super_generation(disk_super);
+ if (disk_super->label[0])
+ printk("device label %s ", disk_super->label);
+ else {
+ /* FIXME, make a readl uuid parser */
+ printk("device fsid %llx-%llx ",
+ *(unsigned long long *)disk_super->fsid,
+ *(unsigned long long *)(disk_super->fsid + 8));
+ }
+ printk("devid %Lu transid %Lu %s\n", devid, transid, path);
ret = device_list_add(path, disk_super, devid, fs_devices_ret);
error_brelse:
brelse(bh);
error_close:
close_bdev_excl(bdev);
- printk("scan one closes bdev %s\n", path);
error:
mutex_unlock(&uuid_mutex);
return ret;
* so we make sure to start at an offset of at least 1MB
*/
search_start = max((u64)1024 * 1024, search_start);
+
+ if (root->fs_info->alloc_start + num_bytes <= device->total_bytes)
+ search_start = max(root->fs_info->alloc_start, search_start);
+
key.objectid = device->devid;
key.offset = search_start;
key.type = BTRFS_DEV_EXTENT_KEY;
return ret;
}
+int btrfs_free_dev_extent(struct btrfs_trans_handle *trans,
+ struct btrfs_device *device,
+ u64 start)
+{
+ int ret;
+ struct btrfs_path *path;
+ struct btrfs_root *root = device->dev_root;
+ struct btrfs_key key;
+ struct btrfs_key found_key;
+ struct extent_buffer *leaf = NULL;
+ struct btrfs_dev_extent *extent = NULL;
+
+ path = btrfs_alloc_path();
+ if (!path)
+ return -ENOMEM;
+
+ key.objectid = device->devid;
+ key.offset = start;
+ key.type = BTRFS_DEV_EXTENT_KEY;
+
+ ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
+ if (ret > 0) {
+ ret = btrfs_previous_item(root, path, key.objectid,
+ BTRFS_DEV_EXTENT_KEY);
+ BUG_ON(ret);
+ leaf = path->nodes[0];
+ btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
+ extent = btrfs_item_ptr(leaf, path->slots[0],
+ struct btrfs_dev_extent);
+ BUG_ON(found_key.offset > start || found_key.offset +
+ btrfs_dev_extent_length(leaf, extent) < start);
+ ret = 0;
+ } else if (ret == 0) {
+ leaf = path->nodes[0];
+ extent = btrfs_item_ptr(leaf, path->slots[0],
+ struct btrfs_dev_extent);
+ }
+ BUG_ON(ret);
+
+ if (device->bytes_used > 0)
+ device->bytes_used -= btrfs_dev_extent_length(leaf, extent);
+ ret = btrfs_del_item(trans, root, path);
+ BUG_ON(ret);
+
+ btrfs_free_path(path);
+ return ret;
+}
+
int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans,
struct btrfs_device *device,
- u64 owner, u64 num_bytes, u64 *start)
+ u64 chunk_tree, u64 chunk_objectid,
+ u64 chunk_offset,
+ u64 num_bytes, u64 *start)
{
int ret;
struct btrfs_path *path;
struct extent_buffer *leaf;
struct btrfs_key key;
+ WARN_ON(!device->in_fs_metadata);
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
leaf = path->nodes[0];
extent = btrfs_item_ptr(leaf, path->slots[0],
struct btrfs_dev_extent);
- btrfs_set_dev_extent_owner(leaf, extent, owner);
+ btrfs_set_dev_extent_chunk_tree(leaf, extent, chunk_tree);
+ btrfs_set_dev_extent_chunk_objectid(leaf, extent, chunk_objectid);
+ btrfs_set_dev_extent_chunk_offset(leaf, extent, chunk_offset);
+
+ write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid,
+ (unsigned long)btrfs_dev_extent_chunk_tree_uuid(extent),
+ BTRFS_UUID_SIZE);
+
btrfs_set_dev_extent_length(leaf, extent, num_bytes);
btrfs_mark_buffer_dirty(leaf);
err:
return ret;
}
-static int find_next_chunk(struct btrfs_root *root, u64 *objectid)
+static int find_next_chunk(struct btrfs_root *root, u64 objectid, u64 *offset)
{
struct btrfs_path *path;
int ret;
struct btrfs_key key;
+ struct btrfs_chunk *chunk;
struct btrfs_key found_key;
path = btrfs_alloc_path();
BUG_ON(!path);
- key.objectid = (u64)-1;
+ key.objectid = objectid;
key.offset = (u64)-1;
key.type = BTRFS_CHUNK_ITEM_KEY;
ret = btrfs_previous_item(root, path, 0, BTRFS_CHUNK_ITEM_KEY);
if (ret) {
- *objectid = 0;
+ *offset = 0;
} else {
btrfs_item_key_to_cpu(path->nodes[0], &found_key,
path->slots[0]);
- *objectid = found_key.objectid + found_key.offset;
+ if (found_key.objectid != objectid)
+ *offset = 0;
+ else {
+ chunk = btrfs_item_ptr(path->nodes[0], path->slots[0],
+ struct btrfs_chunk);
+ *offset = found_key.offset +
+ btrfs_chunk_length(path->nodes[0], chunk);
+ }
}
ret = 0;
error:
struct extent_buffer *leaf;
struct btrfs_key key;
unsigned long ptr;
- u64 free_devid;
+ u64 free_devid = 0;
root = root->fs_info->chunk_root;
btrfs_set_device_sector_size(leaf, dev_item, device->sector_size);
btrfs_set_device_total_bytes(leaf, dev_item, device->total_bytes);
btrfs_set_device_bytes_used(leaf, dev_item, device->bytes_used);
+ btrfs_set_device_group(leaf, dev_item, 0);
+ btrfs_set_device_seek_speed(leaf, dev_item, 0);
+ btrfs_set_device_bandwidth(leaf, dev_item, 0);
ptr = (unsigned long)btrfs_device_uuid(dev_item);
- write_extent_buffer(leaf, device->uuid, ptr, BTRFS_DEV_UUID_SIZE);
+ write_extent_buffer(leaf, device->uuid, ptr, BTRFS_UUID_SIZE);
btrfs_mark_buffer_dirty(leaf);
ret = 0;
btrfs_free_path(path);
return ret;
}
+
+static int btrfs_rm_dev_item(struct btrfs_root *root,
+ struct btrfs_device *device)
+{
+ int ret;
+ struct btrfs_path *path;
+ struct block_device *bdev = device->bdev;
+ struct btrfs_device *next_dev;
+ struct btrfs_key key;
+ u64 total_bytes;
+ struct btrfs_fs_devices *fs_devices;
+ struct btrfs_trans_handle *trans;
+
+ root = root->fs_info->chunk_root;
+
+ path = btrfs_alloc_path();
+ if (!path)
+ return -ENOMEM;
+
+ trans = btrfs_start_transaction(root, 1);
+ key.objectid = BTRFS_DEV_ITEMS_OBJECTID;
+ key.type = BTRFS_DEV_ITEM_KEY;
+ key.offset = device->devid;
+ lock_chunks(root);
+
+ ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
+ if (ret < 0)
+ goto out;
+
+ if (ret > 0) {
+ ret = -ENOENT;
+ goto out;
+ }
+
+ ret = btrfs_del_item(trans, root, path);
+ if (ret)
+ goto out;
+
+ /*
+ * at this point, the device is zero sized. We want to
+ * remove it from the devices list and zero out the old super
+ */
+ list_del_init(&device->dev_list);
+ list_del_init(&device->dev_alloc_list);
+ fs_devices = root->fs_info->fs_devices;
+
+ next_dev = list_entry(fs_devices->devices.next, struct btrfs_device,
+ dev_list);
+ if (bdev == root->fs_info->sb->s_bdev)
+ root->fs_info->sb->s_bdev = next_dev->bdev;
+ if (bdev == fs_devices->latest_bdev)
+ fs_devices->latest_bdev = next_dev->bdev;
+
+ total_bytes = btrfs_super_num_devices(&root->fs_info->super_copy);
+ btrfs_set_super_num_devices(&root->fs_info->super_copy,
+ total_bytes - 1);
+out:
+ btrfs_free_path(path);
+ unlock_chunks(root);
+ btrfs_commit_transaction(trans, root);
+ return ret;
+}
+
+int btrfs_rm_device(struct btrfs_root *root, char *device_path)
+{
+ struct btrfs_device *device;
+ struct block_device *bdev;
+ struct buffer_head *bh = NULL;
+ struct btrfs_super_block *disk_super;
+ u64 all_avail;
+ u64 devid;
+ int ret = 0;
+
+ mutex_lock(&uuid_mutex);
+ mutex_lock(&root->fs_info->volume_mutex);
+
+ all_avail = root->fs_info->avail_data_alloc_bits |
+ root->fs_info->avail_system_alloc_bits |
+ root->fs_info->avail_metadata_alloc_bits;
+
+ if ((all_avail & BTRFS_BLOCK_GROUP_RAID10) &&
+ btrfs_super_num_devices(&root->fs_info->super_copy) <= 4) {
+ printk("btrfs: unable to go below four devices on raid10\n");
+ ret = -EINVAL;
+ goto out;
+ }
+
+ if ((all_avail & BTRFS_BLOCK_GROUP_RAID1) &&
+ btrfs_super_num_devices(&root->fs_info->super_copy) <= 2) {
+ printk("btrfs: unable to go below two devices on raid1\n");
+ ret = -EINVAL;
+ goto out;
+ }
+
+ if (strcmp(device_path, "missing") == 0) {
+ struct list_head *cur;
+ struct list_head *devices;
+ struct btrfs_device *tmp;
+
+ device = NULL;
+ devices = &root->fs_info->fs_devices->devices;
+ list_for_each(cur, devices) {
+ tmp = list_entry(cur, struct btrfs_device, dev_list);
+ if (tmp->in_fs_metadata && !tmp->bdev) {
+ device = tmp;
+ break;
+ }
+ }
+ bdev = NULL;
+ bh = NULL;
+ disk_super = NULL;
+ if (!device) {
+ printk("btrfs: no missing devices found to remove\n");
+ goto out;
+ }
+
+ } else {
+ bdev = open_bdev_excl(device_path, 0,
+ root->fs_info->bdev_holder);
+ if (IS_ERR(bdev)) {
+ ret = PTR_ERR(bdev);
+ goto out;
+ }
+
+ bh = __bread(bdev, BTRFS_SUPER_INFO_OFFSET / 4096, 4096);
+ if (!bh) {
+ ret = -EIO;
+ goto error_close;
+ }
+ disk_super = (struct btrfs_super_block *)bh->b_data;
+ if (strncmp((char *)(&disk_super->magic), BTRFS_MAGIC,
+ sizeof(disk_super->magic))) {
+ ret = -ENOENT;
+ goto error_brelse;
+ }
+ if (memcmp(disk_super->fsid, root->fs_info->fsid,
+ BTRFS_FSID_SIZE)) {
+ ret = -ENOENT;
+ goto error_brelse;
+ }
+ devid = le64_to_cpu(disk_super->dev_item.devid);
+ device = btrfs_find_device(root, devid, NULL);
+ if (!device) {
+ ret = -ENOENT;
+ goto error_brelse;
+ }
+
+ }
+ root->fs_info->fs_devices->num_devices--;
+ root->fs_info->fs_devices->open_devices--;
+
+ ret = btrfs_shrink_device(device, 0);
+ if (ret)
+ goto error_brelse;
+
+
+ ret = btrfs_rm_dev_item(root->fs_info->chunk_root, device);
+ if (ret)
+ goto error_brelse;
+
+ if (bh) {
+ /* make sure this device isn't detected as part of
+ * the FS anymore
+ */
+ memset(&disk_super->magic, 0, sizeof(disk_super->magic));
+ set_buffer_dirty(bh);
+ sync_dirty_buffer(bh);
+
+ brelse(bh);
+ }
+
+ if (device->bdev) {
+ /* one close for the device struct or super_block */
+ close_bdev_excl(device->bdev);
+ }
+ if (bdev) {
+ /* one close for us */
+ close_bdev_excl(bdev);
+ }
+ kfree(device->name);
+ kfree(device);
+ ret = 0;
+ goto out;
+
+error_brelse:
+ brelse(bh);
+error_close:
+ if (bdev)
+ close_bdev_excl(bdev);
+out:
+ mutex_unlock(&root->fs_info->volume_mutex);
+ mutex_unlock(&uuid_mutex);
+ return ret;
+}
+
+int btrfs_init_new_device(struct btrfs_root *root, char *device_path)
+{
+ struct btrfs_trans_handle *trans;
+ struct btrfs_device *device;
+ struct block_device *bdev;
+ struct list_head *cur;
+ struct list_head *devices;
+ u64 total_bytes;
+ int ret = 0;
+
+
+ bdev = open_bdev_excl(device_path, 0, root->fs_info->bdev_holder);
+ if (!bdev) {
+ return -EIO;
+ }
+
+ mutex_lock(&root->fs_info->volume_mutex);
+
+ trans = btrfs_start_transaction(root, 1);
+ lock_chunks(root);
+ devices = &root->fs_info->fs_devices->devices;
+ list_for_each(cur, devices) {
+ device = list_entry(cur, struct btrfs_device, dev_list);
+ if (device->bdev == bdev) {
+ ret = -EEXIST;
+ goto out;
+ }
+ }
+
+ device = kzalloc(sizeof(*device), GFP_NOFS);
+ if (!device) {
+ /* we can safely leave the fs_devices entry around */
+ ret = -ENOMEM;
+ goto out_close_bdev;
+ }
+
+ device->barriers = 1;
+ device->work.func = pending_bios_fn;
+ generate_random_uuid(device->uuid);
+ spin_lock_init(&device->io_lock);
+ device->name = kstrdup(device_path, GFP_NOFS);
+ if (!device->name) {
+ kfree(device);
+ goto out_close_bdev;
+ }
+ device->io_width = root->sectorsize;
+ device->io_align = root->sectorsize;
+ device->sector_size = root->sectorsize;
+ device->total_bytes = i_size_read(bdev->bd_inode);
+ device->dev_root = root->fs_info->dev_root;
+ device->bdev = bdev;
+ device->in_fs_metadata = 1;
+
+ ret = btrfs_add_device(trans, root, device);
+ if (ret)
+ goto out_close_bdev;
+
+ total_bytes = btrfs_super_total_bytes(&root->fs_info->super_copy);
+ btrfs_set_super_total_bytes(&root->fs_info->super_copy,
+ total_bytes + device->total_bytes);
+
+ total_bytes = btrfs_super_num_devices(&root->fs_info->super_copy);
+ btrfs_set_super_num_devices(&root->fs_info->super_copy,
+ total_bytes + 1);
+
+ list_add(&device->dev_list, &root->fs_info->fs_devices->devices);
+ list_add(&device->dev_alloc_list,
+ &root->fs_info->fs_devices->alloc_list);
+ root->fs_info->fs_devices->num_devices++;
+ root->fs_info->fs_devices->open_devices++;
+out:
+ unlock_chunks(root);
+ btrfs_end_transaction(trans, root);
+ mutex_unlock(&root->fs_info->volume_mutex);
+
+ return ret;
+
+out_close_bdev:
+ close_bdev_excl(bdev);
+ goto out;
+}
+
int btrfs_update_device(struct btrfs_trans_handle *trans,
struct btrfs_device *device)
{
return ret;
}
-int btrfs_add_system_chunk(struct btrfs_trans_handle *trans,
- struct btrfs_root *root,
- struct btrfs_key *key,
- struct btrfs_chunk *chunk, int item_size)
+static int __btrfs_grow_device(struct btrfs_trans_handle *trans,
+ struct btrfs_device *device, u64 new_size)
{
- struct btrfs_super_block *super_copy = &root->fs_info->super_copy;
- struct btrfs_disk_key disk_key;
- u32 array_size;
- u8 *ptr;
+ struct btrfs_super_block *super_copy =
+ &device->dev_root->fs_info->super_copy;
+ u64 old_total = btrfs_super_total_bytes(super_copy);
+ u64 diff = new_size - device->total_bytes;
- array_size = btrfs_super_sys_array_size(super_copy);
- if (array_size + item_size > BTRFS_SYSTEM_CHUNK_ARRAY_SIZE)
- return -EFBIG;
+ btrfs_set_super_total_bytes(super_copy, old_total + diff);
+ return btrfs_update_device(trans, device);
+}
- ptr = super_copy->sys_chunk_array + array_size;
- btrfs_cpu_key_to_disk(&disk_key, key);
- memcpy(ptr, &disk_key, sizeof(disk_key));
- ptr += sizeof(disk_key);
- memcpy(ptr, chunk, item_size);
- item_size += sizeof(disk_key);
+int btrfs_grow_device(struct btrfs_trans_handle *trans,
+ struct btrfs_device *device, u64 new_size)
+{
+ int ret;
+ lock_chunks(device->dev_root);
+ ret = __btrfs_grow_device(trans, device, new_size);
+ unlock_chunks(device->dev_root);
+ return ret;
+}
+
+static int btrfs_free_chunk(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ u64 chunk_tree, u64 chunk_objectid,
+ u64 chunk_offset)
+{
+ int ret;
+ struct btrfs_path *path;
+ struct btrfs_key key;
+
+ root = root->fs_info->chunk_root;
+ path = btrfs_alloc_path();
+ if (!path)
+ return -ENOMEM;
+
+ key.objectid = chunk_objectid;
+ key.offset = chunk_offset;
+ key.type = BTRFS_CHUNK_ITEM_KEY;
+
+ ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
+ BUG_ON(ret);
+
+ ret = btrfs_del_item(trans, root, path);
+ BUG_ON(ret);
+
+ btrfs_free_path(path);
+ return 0;
+}
+
+int btrfs_del_sys_chunk(struct btrfs_root *root, u64 chunk_objectid, u64
+ chunk_offset)
+{
+ struct btrfs_super_block *super_copy = &root->fs_info->super_copy;
+ struct btrfs_disk_key *disk_key;
+ struct btrfs_chunk *chunk;
+ u8 *ptr;
+ int ret = 0;
+ u32 num_stripes;
+ u32 array_size;
+ u32 len = 0;
+ u32 cur;
+ struct btrfs_key key;
+
+ array_size = btrfs_super_sys_array_size(super_copy);
+
+ ptr = super_copy->sys_chunk_array;
+ cur = 0;
+
+ while (cur < array_size) {
+ disk_key = (struct btrfs_disk_key *)ptr;
+ btrfs_disk_key_to_cpu(&key, disk_key);
+
+ len = sizeof(*disk_key);
+
+ if (key.type == BTRFS_CHUNK_ITEM_KEY) {
+ chunk = (struct btrfs_chunk *)(ptr + len);
+ num_stripes = btrfs_stack_chunk_num_stripes(chunk);
+ len += btrfs_chunk_item_size(num_stripes);
+ } else {
+ ret = -EIO;
+ break;
+ }
+ if (key.objectid == chunk_objectid &&
+ key.offset == chunk_offset) {
+ memmove(ptr, ptr + len, array_size - (cur + len));
+ array_size -= len;
+ btrfs_set_super_sys_array_size(super_copy, array_size);
+ } else {
+ ptr += len;
+ cur += len;
+ }
+ }
+ return ret;
+}
+
+
+int btrfs_relocate_chunk(struct btrfs_root *root,
+ u64 chunk_tree, u64 chunk_objectid,
+ u64 chunk_offset)
+{
+ struct extent_map_tree *em_tree;
+ struct btrfs_root *extent_root;
+ struct btrfs_trans_handle *trans;
+ struct extent_map *em;
+ struct map_lookup *map;
+ int ret;
+ int i;
+
+ printk("btrfs relocating chunk %llu\n",
+ (unsigned long long)chunk_offset);
+ root = root->fs_info->chunk_root;
+ extent_root = root->fs_info->extent_root;
+ em_tree = &root->fs_info->mapping_tree.map_tree;
+
+ /* step one, relocate all the extents inside this chunk */
+ ret = btrfs_shrink_extent_tree(extent_root, chunk_offset);
+ BUG_ON(ret);
+
+ trans = btrfs_start_transaction(root, 1);
+ BUG_ON(!trans);
+
+ lock_chunks(root);
+
+ /*
+ * step two, delete the device extents and the
+ * chunk tree entries
+ */
+ spin_lock(&em_tree->lock);
+ em = lookup_extent_mapping(em_tree, chunk_offset, 1);
+ spin_unlock(&em_tree->lock);
+
+ BUG_ON(em->start > chunk_offset ||
+ em->start + em->len < chunk_offset);
+ map = (struct map_lookup *)em->bdev;
+
+ for (i = 0; i < map->num_stripes; i++) {
+ ret = btrfs_free_dev_extent(trans, map->stripes[i].dev,
+ map->stripes[i].physical);
+ BUG_ON(ret);
+
+ if (map->stripes[i].dev) {
+ ret = btrfs_update_device(trans, map->stripes[i].dev);
+ BUG_ON(ret);
+ }
+ }
+ ret = btrfs_free_chunk(trans, root, chunk_tree, chunk_objectid,
+ chunk_offset);
+
+ BUG_ON(ret);
+
+ if (map->type & BTRFS_BLOCK_GROUP_SYSTEM) {
+ ret = btrfs_del_sys_chunk(root, chunk_objectid, chunk_offset);
+ BUG_ON(ret);
+ }
+
+ spin_lock(&em_tree->lock);
+ remove_extent_mapping(em_tree, em);
+ kfree(map);
+ em->bdev = NULL;
+
+ /* once for the tree */
+ free_extent_map(em);
+ spin_unlock(&em_tree->lock);
+
+ /* once for us */
+ free_extent_map(em);
+
+ unlock_chunks(root);
+ btrfs_end_transaction(trans, root);
+ return 0;
+}
+
+static u64 div_factor(u64 num, int factor)
+{
+ if (factor == 10)
+ return num;
+ num *= factor;
+ do_div(num, 10);
+ return num;
+}
+
+
+int btrfs_balance(struct btrfs_root *dev_root)
+{
+ int ret;
+ struct list_head *cur;
+ struct list_head *devices = &dev_root->fs_info->fs_devices->devices;
+ struct btrfs_device *device;
+ u64 old_size;
+ u64 size_to_free;
+ struct btrfs_path *path;
+ struct btrfs_key key;
+ struct btrfs_chunk *chunk;
+ struct btrfs_root *chunk_root = dev_root->fs_info->chunk_root;
+ struct btrfs_trans_handle *trans;
+ struct btrfs_key found_key;
+
+
+ mutex_lock(&dev_root->fs_info->volume_mutex);
+ dev_root = dev_root->fs_info->dev_root;
+
+ /* step one make some room on all the devices */
+ list_for_each(cur, devices) {
+ device = list_entry(cur, struct btrfs_device, dev_list);
+ old_size = device->total_bytes;
+ size_to_free = div_factor(old_size, 1);
+ size_to_free = min(size_to_free, (u64)1 * 1024 * 1024);
+ if (device->total_bytes - device->bytes_used > size_to_free)
+ continue;
+
+ ret = btrfs_shrink_device(device, old_size - size_to_free);
+ BUG_ON(ret);
+
+ trans = btrfs_start_transaction(dev_root, 1);
+ BUG_ON(!trans);
+
+ ret = btrfs_grow_device(trans, device, old_size);
+ BUG_ON(ret);
+
+ btrfs_end_transaction(trans, dev_root);
+ }
+
+ /* step two, relocate all the chunks */
+ path = btrfs_alloc_path();
+ BUG_ON(!path);
+
+ key.objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID;
+ key.offset = (u64)-1;
+ key.type = BTRFS_CHUNK_ITEM_KEY;
+
+ while(1) {
+ ret = btrfs_search_slot(NULL, chunk_root, &key, path, 0, 0);
+ if (ret < 0)
+ goto error;
+
+ /*
+ * this shouldn't happen, it means the last relocate
+ * failed
+ */
+ if (ret == 0)
+ break;
+
+ ret = btrfs_previous_item(chunk_root, path, 0,
+ BTRFS_CHUNK_ITEM_KEY);
+ if (ret)
+ break;
+
+ btrfs_item_key_to_cpu(path->nodes[0], &found_key,
+ path->slots[0]);
+ if (found_key.objectid != key.objectid)
+ break;
+
+ chunk = btrfs_item_ptr(path->nodes[0],
+ path->slots[0],
+ struct btrfs_chunk);
+ key.offset = found_key.offset;
+ /* chunk zero is special */
+ if (key.offset == 0)
+ break;
+
+ btrfs_release_path(chunk_root, path);
+ ret = btrfs_relocate_chunk(chunk_root,
+ chunk_root->root_key.objectid,
+ found_key.objectid,
+ found_key.offset);
+ BUG_ON(ret);
+ }
+ ret = 0;
+error:
+ btrfs_free_path(path);
+ mutex_unlock(&dev_root->fs_info->volume_mutex);
+ return ret;
+}
+
+/*
+ * shrinking a device means finding all of the device extents past
+ * the new size, and then following the back refs to the chunks.
+ * The chunk relocation code actually frees the device extent
+ */
+int btrfs_shrink_device(struct btrfs_device *device, u64 new_size)
+{
+ struct btrfs_trans_handle *trans;
+ struct btrfs_root *root = device->dev_root;
+ struct btrfs_dev_extent *dev_extent = NULL;
+ struct btrfs_path *path;
+ u64 length;
+ u64 chunk_tree;
+ u64 chunk_objectid;
+ u64 chunk_offset;
+ int ret;
+ int slot;
+ struct extent_buffer *l;
+ struct btrfs_key key;
+ struct btrfs_super_block *super_copy = &root->fs_info->super_copy;
+ u64 old_total = btrfs_super_total_bytes(super_copy);
+ u64 diff = device->total_bytes - new_size;
+
+
+ path = btrfs_alloc_path();
+ if (!path)
+ return -ENOMEM;
+
+ trans = btrfs_start_transaction(root, 1);
+ if (!trans) {
+ ret = -ENOMEM;
+ goto done;
+ }
+
+ path->reada = 2;
+
+ lock_chunks(root);
+
+ device->total_bytes = new_size;
+ ret = btrfs_update_device(trans, device);
+ if (ret) {
+ unlock_chunks(root);
+ btrfs_end_transaction(trans, root);
+ goto done;
+ }
+ WARN_ON(diff > old_total);
+ btrfs_set_super_total_bytes(super_copy, old_total - diff);
+ unlock_chunks(root);
+ btrfs_end_transaction(trans, root);
+
+ key.objectid = device->devid;
+ key.offset = (u64)-1;
+ key.type = BTRFS_DEV_EXTENT_KEY;
+
+ while (1) {
+ ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
+ if (ret < 0)
+ goto done;
+
+ ret = btrfs_previous_item(root, path, 0, key.type);
+ if (ret < 0)
+ goto done;
+ if (ret) {
+ ret = 0;
+ goto done;
+ }
+
+ l = path->nodes[0];
+ slot = path->slots[0];
+ btrfs_item_key_to_cpu(l, &key, path->slots[0]);
+
+ if (key.objectid != device->devid)
+ goto done;
+
+ dev_extent = btrfs_item_ptr(l, slot, struct btrfs_dev_extent);
+ length = btrfs_dev_extent_length(l, dev_extent);
+
+ if (key.offset + length <= new_size)
+ goto done;
+
+ chunk_tree = btrfs_dev_extent_chunk_tree(l, dev_extent);
+ chunk_objectid = btrfs_dev_extent_chunk_objectid(l, dev_extent);
+ chunk_offset = btrfs_dev_extent_chunk_offset(l, dev_extent);
+ btrfs_release_path(root, path);
+
+ ret = btrfs_relocate_chunk(root, chunk_tree, chunk_objectid,
+ chunk_offset);
+ if (ret)
+ goto done;
+ }
+
+done:
+ btrfs_free_path(path);
+ return ret;
+}
+
+int btrfs_add_system_chunk(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct btrfs_key *key,
+ struct btrfs_chunk *chunk, int item_size)
+{
+ struct btrfs_super_block *super_copy = &root->fs_info->super_copy;
+ struct btrfs_disk_key disk_key;
+ u32 array_size;
+ u8 *ptr;
+
+ array_size = btrfs_super_sys_array_size(super_copy);
+ if (array_size + item_size > BTRFS_SYSTEM_CHUNK_ARRAY_SIZE)
+ return -EFBIG;
+
+ ptr = super_copy->sys_chunk_array + array_size;
+ btrfs_cpu_key_to_disk(&disk_key, key);
+ memcpy(ptr, &disk_key, sizeof(disk_key));
+ ptr += sizeof(disk_key);
+ memcpy(ptr, chunk, item_size);
+ item_size += sizeof(disk_key);
btrfs_set_super_sys_array_size(super_copy, array_size + item_size);
return 0;
}
+static u64 chunk_bytes_by_type(u64 type, u64 calc_size, int num_stripes,
+ int sub_stripes)
+{
+ if (type & (BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_DUP))
+ return calc_size;
+ else if (type & BTRFS_BLOCK_GROUP_RAID10)
+ return calc_size * (num_stripes / sub_stripes);
+ else
+ return calc_size * num_stripes;
+}
+
+
int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
struct btrfs_root *extent_root, u64 *start,
u64 *num_bytes, u64 type)
u64 dev_offset;
struct btrfs_fs_info *info = extent_root->fs_info;
struct btrfs_root *chunk_root = extent_root->fs_info->chunk_root;
+ struct btrfs_path *path;
struct btrfs_stripe *stripes;
struct btrfs_device *device = NULL;
struct btrfs_chunk *chunk;
struct list_head private_devs;
- struct list_head *dev_list = &extent_root->fs_info->fs_devices->devices;
+ struct list_head *dev_list;
struct list_head *cur;
struct extent_map_tree *em_tree;
struct map_lookup *map;
struct extent_map *em;
+ int min_stripe_size = 1 * 1024 * 1024;
u64 physical;
u64 calc_size = 1024 * 1024 * 1024;
+ u64 max_chunk_size = calc_size;
+ u64 min_free;
u64 avail;
u64 max_avail = 0;
+ u64 percent_max;
int num_stripes = 1;
+ int min_stripes = 1;
+ int sub_stripes = 0;
int looped = 0;
int ret;
int index;
int stripe_len = 64 * 1024;
struct btrfs_key key;
+ if ((type & BTRFS_BLOCK_GROUP_RAID1) &&
+ (type & BTRFS_BLOCK_GROUP_DUP)) {
+ WARN_ON(1);
+ type &= ~BTRFS_BLOCK_GROUP_DUP;
+ }
+ dev_list = &extent_root->fs_info->fs_devices->alloc_list;
if (list_empty(dev_list))
return -ENOSPC;
- if (type & BTRFS_BLOCK_GROUP_RAID0)
- num_stripes = btrfs_super_num_devices(&info->super_copy);
- if (type & BTRFS_BLOCK_GROUP_DATA)
- stripe_len = 64 * 1024;
- if (type & (BTRFS_BLOCK_GROUP_METADATA | BTRFS_BLOCK_GROUP_SYSTEM))
- stripe_len = 32 * 1024;
+ if (type & (BTRFS_BLOCK_GROUP_RAID0)) {
+ num_stripes = extent_root->fs_info->fs_devices->open_devices;
+ min_stripes = 2;
+ }
+ if (type & (BTRFS_BLOCK_GROUP_DUP)) {
+ num_stripes = 2;
+ min_stripes = 2;
+ }
+ if (type & (BTRFS_BLOCK_GROUP_RAID1)) {
+ num_stripes = min_t(u64, 2,
+ extent_root->fs_info->fs_devices->open_devices);
+ if (num_stripes < 2)
+ return -ENOSPC;
+ min_stripes = 2;
+ }
+ if (type & (BTRFS_BLOCK_GROUP_RAID10)) {
+ num_stripes = extent_root->fs_info->fs_devices->open_devices;
+ if (num_stripes < 4)
+ return -ENOSPC;
+ num_stripes &= ~(u32)1;
+ sub_stripes = 2;
+ min_stripes = 4;
+ }
+
+ if (type & BTRFS_BLOCK_GROUP_DATA) {
+ max_chunk_size = 10 * calc_size;
+ min_stripe_size = 64 * 1024 * 1024;
+ } else if (type & BTRFS_BLOCK_GROUP_METADATA) {
+ max_chunk_size = 4 * calc_size;
+ min_stripe_size = 32 * 1024 * 1024;
+ } else if (type & BTRFS_BLOCK_GROUP_SYSTEM) {
+ calc_size = 8 * 1024 * 1024;
+ max_chunk_size = calc_size * 2;
+ min_stripe_size = 1 * 1024 * 1024;
+ }
+
+ path = btrfs_alloc_path();
+ if (!path)
+ return -ENOMEM;
+
+ /* we don't want a chunk larger than 10% of the FS */
+ percent_max = div_factor(btrfs_super_total_bytes(&info->super_copy), 1);
+ max_chunk_size = min(percent_max, max_chunk_size);
+
again:
+ if (calc_size * num_stripes > max_chunk_size) {
+ calc_size = max_chunk_size;
+ do_div(calc_size, num_stripes);
+ do_div(calc_size, stripe_len);
+ calc_size *= stripe_len;
+ }
+ /* we don't want tiny stripes */
+ calc_size = max_t(u64, min_stripe_size, calc_size);
+
+ do_div(calc_size, stripe_len);
+ calc_size *= stripe_len;
+
INIT_LIST_HEAD(&private_devs);
cur = dev_list->next;
index = 0;
+
+ if (type & BTRFS_BLOCK_GROUP_DUP)
+ min_free = calc_size * 2;
+ else
+ min_free = calc_size;
+
+ /* we add 1MB because we never use the first 1MB of the device */
+ min_free += 1024 * 1024;
+
/* build a private list of devices we will allocate from */
while(index < num_stripes) {
- device = list_entry(cur, struct btrfs_device, dev_list);
- avail = device->total_bytes - device->bytes_used;
+ device = list_entry(cur, struct btrfs_device, dev_alloc_list);
+
+ if (device->total_bytes > device->bytes_used)
+ avail = device->total_bytes - device->bytes_used;
+ else
+ avail = 0;
cur = cur->next;
- if (avail > max_avail)
+
+ if (device->in_fs_metadata && avail >= min_free) {
+ u64 ignored_start = 0;
+ ret = find_free_dev_extent(trans, device, path,
+ min_free,
+ &ignored_start);
+ if (ret == 0) {
+ list_move_tail(&device->dev_alloc_list,
+ &private_devs);
+ index++;
+ if (type & BTRFS_BLOCK_GROUP_DUP)
+ index++;
+ }
+ } else if (device->in_fs_metadata && avail > max_avail)
max_avail = avail;
- if (avail >= calc_size) {
- list_move_tail(&device->dev_list, &private_devs);
- index++;
- }
if (cur == dev_list)
break;
}
if (index < num_stripes) {
list_splice(&private_devs, dev_list);
+ if (index >= min_stripes) {
+ num_stripes = index;
+ if (type & (BTRFS_BLOCK_GROUP_RAID10)) {
+ num_stripes /= sub_stripes;
+ num_stripes *= sub_stripes;
+ }
+ looped = 1;
+ goto again;
+ }
if (!looped && max_avail > 0) {
looped = 1;
calc_size = max_avail;
goto again;
}
+ btrfs_free_path(path);
return -ENOSPC;
}
-
- ret = find_next_chunk(chunk_root, &key.objectid);
- if (ret)
+ key.objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID;
+ key.type = BTRFS_CHUNK_ITEM_KEY;
+ ret = find_next_chunk(chunk_root, BTRFS_FIRST_CHUNK_TREE_OBJECTID,
+ &key.offset);
+ if (ret) {
+ btrfs_free_path(path);
return ret;
+ }
chunk = kmalloc(btrfs_chunk_item_size(num_stripes), GFP_NOFS);
- if (!chunk)
+ if (!chunk) {
+ btrfs_free_path(path);
return -ENOMEM;
+ }
map = kmalloc(map_lookup_size(num_stripes), GFP_NOFS);
if (!map) {
kfree(chunk);
+ btrfs_free_path(path);
return -ENOMEM;
}
+ btrfs_free_path(path);
+ path = NULL;
stripes = &chunk->stripe;
+ *num_bytes = chunk_bytes_by_type(type, calc_size,
+ num_stripes, sub_stripes);
- *num_bytes = calc_size * num_stripes;
index = 0;
while(index < num_stripes) {
+ struct btrfs_stripe *stripe;
BUG_ON(list_empty(&private_devs));
cur = private_devs.next;
- device = list_entry(cur, struct btrfs_device, dev_list);
- list_move_tail(&device->dev_list, dev_list);
+ device = list_entry(cur, struct btrfs_device, dev_alloc_list);
+
+ /* loop over this device again if we're doing a dup group */
+ if (!(type & BTRFS_BLOCK_GROUP_DUP) ||
+ (index == num_stripes - 1))
+ list_move_tail(&device->dev_alloc_list, dev_list);
ret = btrfs_alloc_dev_extent(trans, device,
- key.objectid,
- calc_size, &dev_offset);
+ info->chunk_root->root_key.objectid,
+ BTRFS_FIRST_CHUNK_TREE_OBJECTID, key.offset,
+ calc_size, &dev_offset);
BUG_ON(ret);
-printk("alloc chunk size %Lu from dev %Lu\n", calc_size, device->devid);
device->bytes_used += calc_size;
ret = btrfs_update_device(trans, device);
BUG_ON(ret);
map->stripes[index].dev = device;
map->stripes[index].physical = dev_offset;
- btrfs_set_stack_stripe_devid(stripes + index, device->devid);
- btrfs_set_stack_stripe_offset(stripes + index, dev_offset);
+ stripe = stripes + index;
+ btrfs_set_stack_stripe_devid(stripe, device->devid);
+ btrfs_set_stack_stripe_offset(stripe, dev_offset);
+ memcpy(stripe->dev_uuid, device->uuid, BTRFS_UUID_SIZE);
physical = dev_offset;
index++;
}
BUG_ON(!list_empty(&private_devs));
- /* key.objectid was set above */
- key.offset = *num_bytes;
- key.type = BTRFS_CHUNK_ITEM_KEY;
+ /* key was set above */
+ btrfs_set_stack_chunk_length(chunk, *num_bytes);
btrfs_set_stack_chunk_owner(chunk, extent_root->root_key.objectid);
btrfs_set_stack_chunk_stripe_len(chunk, stripe_len);
btrfs_set_stack_chunk_type(chunk, type);
btrfs_set_stack_chunk_io_align(chunk, stripe_len);
btrfs_set_stack_chunk_io_width(chunk, stripe_len);
btrfs_set_stack_chunk_sector_size(chunk, extent_root->sectorsize);
+ btrfs_set_stack_chunk_sub_stripes(chunk, sub_stripes);
map->sector_size = extent_root->sectorsize;
map->stripe_len = stripe_len;
map->io_align = stripe_len;
map->io_width = stripe_len;
map->type = type;
map->num_stripes = num_stripes;
+ map->sub_stripes = sub_stripes;
ret = btrfs_insert_item(trans, chunk_root, &key, chunk,
btrfs_chunk_item_size(num_stripes));
BUG_ON(ret);
- *start = key.objectid;
+ *start = key.offset;;
em = alloc_extent_map(GFP_NOFS);
if (!em)
return -ENOMEM;
em->bdev = (struct block_device *)map;
- em->start = key.objectid;
- em->len = key.offset;
+ em->start = key.offset;
+ em->len = *num_bytes;
em->block_start = 0;
+ if (type & BTRFS_BLOCK_GROUP_SYSTEM) {
+ ret = btrfs_add_system_chunk(trans, chunk_root, &key,
+ chunk, btrfs_chunk_item_size(num_stripes));
+ BUG_ON(ret);
+ }
kfree(chunk);
em_tree = &extent_root->fs_info->mapping_tree.map_tree;
spin_lock(&em_tree->lock);
ret = add_extent_mapping(em_tree, em);
- BUG_ON(ret);
spin_unlock(&em_tree->lock);
+ BUG_ON(ret);
free_extent_map(em);
return ret;
}
}
}
-int btrfs_map_block(struct btrfs_mapping_tree *map_tree,
- u64 logical, u64 *phys, u64 *length,
- struct btrfs_device **dev)
+int btrfs_num_copies(struct btrfs_mapping_tree *map_tree, u64 logical, u64 len)
+{
+ struct extent_map *em;
+ struct map_lookup *map;
+ struct extent_map_tree *em_tree = &map_tree->map_tree;
+ int ret;
+
+ spin_lock(&em_tree->lock);
+ em = lookup_extent_mapping(em_tree, logical, len);
+ spin_unlock(&em_tree->lock);
+ BUG_ON(!em);
+
+ BUG_ON(em->start > logical || em->start + em->len < logical);
+ map = (struct map_lookup *)em->bdev;
+ if (map->type & (BTRFS_BLOCK_GROUP_DUP | BTRFS_BLOCK_GROUP_RAID1))
+ ret = map->num_stripes;
+ else if (map->type & BTRFS_BLOCK_GROUP_RAID10)
+ ret = map->sub_stripes;
+ else
+ ret = 1;
+ free_extent_map(em);
+ return ret;
+}
+
+static int find_live_mirror(struct map_lookup *map, int first, int num,
+ int optimal)
+{
+ int i;
+ if (map->stripes[optimal].dev->bdev)
+ return optimal;
+ for (i = first; i < first + num; i++) {
+ if (map->stripes[i].dev->bdev)
+ return i;
+ }
+ /* we couldn't find one that doesn't fail. Just return something
+ * and the io error handling code will clean up eventually
+ */
+ return optimal;
+}
+
+static int __btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw,
+ u64 logical, u64 *length,
+ struct btrfs_multi_bio **multi_ret,
+ int mirror_num, struct page *unplug_page)
{
struct extent_map *em;
struct map_lookup *map;
u64 offset;
u64 stripe_offset;
u64 stripe_nr;
+ int stripes_allocated = 8;
+ int stripes_required = 1;
int stripe_index;
+ int i;
+ int num_stripes;
+ int max_errors = 0;
+ struct btrfs_multi_bio *multi = NULL;
+ if (multi_ret && !(rw & (1 << BIO_RW))) {
+ stripes_allocated = 1;
+ }
+again:
+ if (multi_ret) {
+ multi = kzalloc(btrfs_multi_bio_size(stripes_allocated),
+ GFP_NOFS);
+ if (!multi)
+ return -ENOMEM;
+
+ atomic_set(&multi->error, 0);
+ }
spin_lock(&em_tree->lock);
em = lookup_extent_mapping(em_tree, logical, *length);
- BUG_ON(!em);
+ spin_unlock(&em_tree->lock);
+
+ if (!em && unplug_page)
+ return 0;
+
+ if (!em) {
+ printk("unable to find logical %Lu len %Lu\n", logical, *length);
+ BUG();
+ }
BUG_ON(em->start > logical || em->start + em->len < logical);
map = (struct map_lookup *)em->bdev;
offset = logical - em->start;
+ if (mirror_num > map->num_stripes)
+ mirror_num = 0;
+
+ /* if our multi bio struct is too small, back off and try again */
+ if (rw & (1 << BIO_RW)) {
+ if (map->type & (BTRFS_BLOCK_GROUP_RAID1 |
+ BTRFS_BLOCK_GROUP_DUP)) {
+ stripes_required = map->num_stripes;
+ max_errors = 1;
+ } else if (map->type & BTRFS_BLOCK_GROUP_RAID10) {
+ stripes_required = map->sub_stripes;
+ max_errors = 1;
+ }
+ }
+ if (multi_ret && rw == WRITE &&
+ stripes_allocated < stripes_required) {
+ stripes_allocated = map->num_stripes;
+ free_extent_map(em);
+ kfree(multi);
+ goto again;
+ }
stripe_nr = offset;
/*
* stripe_nr counts the total number of stripes we have to stride
/* stripe_offset is the offset of this block in its stripe*/
stripe_offset = offset - stripe_offset;
- /*
- * after this do_div call, stripe_nr is the number of stripes
- * on this device we have to walk to find the data, and
- * stripe_index is the number of our device in the stripe array
- */
- stripe_index = do_div(stripe_nr, map->num_stripes);
-
- BUG_ON(stripe_index >= map->num_stripes);
-
- *phys = map->stripes[stripe_index].physical + stripe_offset +
- stripe_nr * map->stripe_len;
-
- if (map->type & BTRFS_BLOCK_GROUP_RAID0) {
+ if (map->type & (BTRFS_BLOCK_GROUP_RAID0 | BTRFS_BLOCK_GROUP_RAID1 |
+ BTRFS_BLOCK_GROUP_RAID10 |
+ BTRFS_BLOCK_GROUP_DUP)) {
/* we limit the length of each bio to what fits in a stripe */
*length = min_t(u64, em->len - offset,
map->stripe_len - stripe_offset);
} else {
*length = em->len - offset;
}
- *dev = map->stripes[stripe_index].dev;
+
+ if (!multi_ret && !unplug_page)
+ goto out;
+
+ num_stripes = 1;
+ stripe_index = 0;
+ if (map->type & BTRFS_BLOCK_GROUP_RAID1) {
+ if (unplug_page || (rw & (1 << BIO_RW)))
+ num_stripes = map->num_stripes;
+ else if (mirror_num)
+ stripe_index = mirror_num - 1;
+ else {
+ stripe_index = find_live_mirror(map, 0,
+ map->num_stripes,
+ current->pid % map->num_stripes);
+ }
+
+ } else if (map->type & BTRFS_BLOCK_GROUP_DUP) {
+ if (rw & (1 << BIO_RW))
+ num_stripes = map->num_stripes;
+ else if (mirror_num)
+ stripe_index = mirror_num - 1;
+
+ } else if (map->type & BTRFS_BLOCK_GROUP_RAID10) {
+ int factor = map->num_stripes / map->sub_stripes;
+
+ stripe_index = do_div(stripe_nr, factor);
+ stripe_index *= map->sub_stripes;
+
+ if (unplug_page || (rw & (1 << BIO_RW)))
+ num_stripes = map->sub_stripes;
+ else if (mirror_num)
+ stripe_index += mirror_num - 1;
+ else {
+ stripe_index = find_live_mirror(map, stripe_index,
+ map->sub_stripes, stripe_index +
+ current->pid % map->sub_stripes);
+ }
+ } else {
+ /*
+ * after this do_div call, stripe_nr is the number of stripes
+ * on this device we have to walk to find the data, and
+ * stripe_index is the number of our device in the stripe array
+ */
+ stripe_index = do_div(stripe_nr, map->num_stripes);
+ }
+ BUG_ON(stripe_index >= map->num_stripes);
+
+ for (i = 0; i < num_stripes; i++) {
+ if (unplug_page) {
+ struct btrfs_device *device;
+ struct backing_dev_info *bdi;
+
+ device = map->stripes[stripe_index].dev;
+ if (device->bdev) {
+ bdi = blk_get_backing_dev_info(device->bdev);
+ if (bdi->unplug_io_fn) {
+ bdi->unplug_io_fn(bdi, unplug_page);
+ }
+ }
+ } else {
+ multi->stripes[i].physical =
+ map->stripes[stripe_index].physical +
+ stripe_offset + stripe_nr * map->stripe_len;
+ multi->stripes[i].dev = map->stripes[stripe_index].dev;
+ }
+ stripe_index++;
+ }
+ if (multi_ret) {
+ *multi_ret = multi;
+ multi->num_stripes = num_stripes;
+ multi->max_errors = max_errors;
+ }
+out:
free_extent_map(em);
- spin_unlock(&em_tree->lock);
return 0;
}
-int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio)
+int btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw,
+ u64 logical, u64 *length,
+ struct btrfs_multi_bio **multi_ret, int mirror_num)
+{
+ return __btrfs_map_block(map_tree, rw, logical, length, multi_ret,
+ mirror_num, NULL);
+}
+
+int btrfs_unplug_page(struct btrfs_mapping_tree *map_tree,
+ u64 logical, struct page *page)
+{
+ u64 length = PAGE_CACHE_SIZE;
+ return __btrfs_map_block(map_tree, READ, logical, &length,
+ NULL, 0, page);
+}
+
+
+#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23)
+static void end_bio_multi_stripe(struct bio *bio, int err)
+#else
+static int end_bio_multi_stripe(struct bio *bio,
+ unsigned int bytes_done, int err)
+#endif
+{
+ struct btrfs_multi_bio *multi = bio->bi_private;
+
+#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23)
+ if (bio->bi_size)
+ return 1;
+#endif
+ if (err)
+ atomic_inc(&multi->error);
+
+ if (atomic_dec_and_test(&multi->stripes_pending)) {
+ bio->bi_private = multi->private;
+ bio->bi_end_io = multi->end_io;
+ /* only send an error to the higher layers if it is
+ * beyond the tolerance of the multi-bio
+ */
+ if (atomic_read(&multi->error) > multi->max_errors) {
+ err = -EIO;
+ } else if (err) {
+ /*
+ * this bio is actually up to date, we didn't
+ * go over the max number of errors
+ */
+ set_bit(BIO_UPTODATE, &bio->bi_flags);
+ err = 0;
+ }
+ kfree(multi);
+
+#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23)
+ bio_endio(bio, bio->bi_size, err);
+#else
+ bio_endio(bio, err);
+#endif
+ } else {
+ bio_put(bio);
+ }
+#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23)
+ return 0;
+#endif
+}
+
+struct async_sched {
+ struct bio *bio;
+ int rw;
+ struct btrfs_fs_info *info;
+ struct btrfs_work work;
+};
+
+/*
+ * see run_scheduled_bios for a description of why bios are collected for
+ * async submit.
+ *
+ * This will add one bio to the pending list for a device and make sure
+ * the work struct is scheduled.
+ */
+int schedule_bio(struct btrfs_root *root, struct btrfs_device *device,
+ int rw, struct bio *bio)
+{
+ int should_queue = 1;
+
+ /* don't bother with additional async steps for reads, right now */
+ if (!(rw & (1 << BIO_RW))) {
+ submit_bio(rw, bio);
+ return 0;
+ }
+
+ /*
+ * nr_async_sumbits allows us to reliably return congestion to the
+ * higher layers. Otherwise, the async bio makes it appear we have
+ * made progress against dirty pages when we've really just put it
+ * on a queue for later
+ */
+ atomic_inc(&root->fs_info->nr_async_submits);
+ bio->bi_next = NULL;
+ bio->bi_rw |= rw;
+
+ spin_lock(&device->io_lock);
+
+ if (device->pending_bio_tail)
+ device->pending_bio_tail->bi_next = bio;
+
+ device->pending_bio_tail = bio;
+ if (!device->pending_bios)
+ device->pending_bios = bio;
+ if (device->running_pending)
+ should_queue = 0;
+
+ spin_unlock(&device->io_lock);
+
+ if (should_queue)
+ btrfs_queue_worker(&root->fs_info->submit_workers,
+ &device->work);
+ return 0;
+}
+
+int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio,
+ int mirror_num, int async_submit)
{
struct btrfs_mapping_tree *map_tree;
struct btrfs_device *dev;
+ struct bio *first_bio = bio;
u64 logical = bio->bi_sector << 9;
- u64 physical;
u64 length = 0;
u64 map_length;
- struct bio_vec *bvec;
- int i;
+ struct btrfs_multi_bio *multi = NULL;
int ret;
+ int dev_nr = 0;
+ int total_devs = 1;
- bio_for_each_segment(bvec, bio, i) {
- length += bvec->bv_len;
- }
+ length = bio->bi_size;
map_tree = &root->fs_info->mapping_tree;
map_length = length;
- ret = btrfs_map_block(map_tree, logical, &physical, &map_length, &dev);
+
+ ret = btrfs_map_block(map_tree, rw, logical, &map_length, &multi,
+ mirror_num);
+ BUG_ON(ret);
+
+ total_devs = multi->num_stripes;
if (map_length < length) {
- printk("mapping failed logical %Lu bio len %Lu physical %Lu "
- "len %Lu\n", logical, length, physical, map_length);
+ printk("mapping failed logical %Lu bio len %Lu "
+ "len %Lu\n", logical, length, map_length);
BUG();
}
- BUG_ON(map_length < length);
- bio->bi_sector = physical >> 9;
- bio->bi_bdev = dev->bdev;
- submit_bio(rw, bio);
+ multi->end_io = first_bio->bi_end_io;
+ multi->private = first_bio->bi_private;
+ atomic_set(&multi->stripes_pending, multi->num_stripes);
+
+ while(dev_nr < total_devs) {
+ if (total_devs > 1) {
+ if (dev_nr < total_devs - 1) {
+ bio = bio_clone(first_bio, GFP_NOFS);
+ BUG_ON(!bio);
+ } else {
+ bio = first_bio;
+ }
+ bio->bi_private = multi;
+ bio->bi_end_io = end_bio_multi_stripe;
+ }
+ bio->bi_sector = multi->stripes[dev_nr].physical >> 9;
+ dev = multi->stripes[dev_nr].dev;
+ if (dev && dev->bdev) {
+ bio->bi_bdev = dev->bdev;
+ if (async_submit)
+ schedule_bio(root, dev, rw, bio);
+ else
+ submit_bio(rw, bio);
+ } else {
+ bio->bi_bdev = root->fs_info->fs_devices->latest_bdev;
+ bio->bi_sector = logical >> 9;
+#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23)
+ bio_endio(bio, bio->bi_size, -EIO);
+#else
+ bio_endio(bio, -EIO);
+#endif
+ }
+ dev_nr++;
+ }
+ if (total_devs == 1)
+ kfree(multi);
return 0;
}
-struct btrfs_device *btrfs_find_device(struct btrfs_root *root, u64 devid)
+struct btrfs_device *btrfs_find_device(struct btrfs_root *root, u64 devid,
+ u8 *uuid)
{
struct list_head *head = &root->fs_info->fs_devices->devices;
- return __find_device(head, devid);
+ return __find_device(head, devid, uuid);
}
+static struct btrfs_device *add_missing_dev(struct btrfs_root *root,
+ u64 devid, u8 *dev_uuid)
+{
+ struct btrfs_device *device;
+ struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices;
+
+ device = kzalloc(sizeof(*device), GFP_NOFS);
+ list_add(&device->dev_list,
+ &fs_devices->devices);
+ list_add(&device->dev_alloc_list,
+ &fs_devices->alloc_list);
+ device->barriers = 1;
+ device->dev_root = root->fs_info->dev_root;
+ device->devid = devid;
+ device->work.func = pending_bios_fn;
+ fs_devices->num_devices++;
+ spin_lock_init(&device->io_lock);
+ memcpy(device->uuid, dev_uuid, BTRFS_UUID_SIZE);
+ return device;
+}
+
+
static int read_one_chunk(struct btrfs_root *root, struct btrfs_key *key,
struct extent_buffer *leaf,
struct btrfs_chunk *chunk)
u64 logical;
u64 length;
u64 devid;
+ u8 uuid[BTRFS_UUID_SIZE];
int num_stripes;
int ret;
int i;
- logical = key->objectid;
- length = key->offset;
+ logical = key->offset;
+ length = btrfs_chunk_length(leaf, chunk);
+
spin_lock(&map_tree->map_tree.lock);
em = lookup_extent_mapping(&map_tree->map_tree, logical, 1);
+ spin_unlock(&map_tree->map_tree.lock);
/* already mapped? */
if (em && em->start <= logical && em->start + em->len > logical) {
free_extent_map(em);
- spin_unlock(&map_tree->map_tree.lock);
return 0;
} else if (em) {
free_extent_map(em);
}
- spin_unlock(&map_tree->map_tree.lock);
map = kzalloc(sizeof(*map), GFP_NOFS);
if (!map)
map->sector_size = btrfs_chunk_sector_size(leaf, chunk);
map->stripe_len = btrfs_chunk_stripe_len(leaf, chunk);
map->type = btrfs_chunk_type(leaf, chunk);
+ map->sub_stripes = btrfs_chunk_sub_stripes(leaf, chunk);
for (i = 0; i < num_stripes; i++) {
map->stripes[i].physical =
btrfs_stripe_offset_nr(leaf, chunk, i);
devid = btrfs_stripe_devid_nr(leaf, chunk, i);
- map->stripes[i].dev = btrfs_find_device(root, devid);
- if (!map->stripes[i].dev) {
+ read_extent_buffer(leaf, uuid, (unsigned long)
+ btrfs_stripe_dev_uuid_nr(chunk, i),
+ BTRFS_UUID_SIZE);
+ map->stripes[i].dev = btrfs_find_device(root, devid, uuid);
+
+ if (!map->stripes[i].dev && !btrfs_test_opt(root, DEGRADED)) {
kfree(map);
free_extent_map(em);
return -EIO;
}
+ if (!map->stripes[i].dev) {
+ map->stripes[i].dev =
+ add_missing_dev(root, devid, uuid);
+ if (!map->stripes[i].dev) {
+ kfree(map);
+ free_extent_map(em);
+ return -EIO;
+ }
+ }
+ map->stripes[i].dev->in_fs_metadata = 1;
}
spin_lock(&map_tree->map_tree.lock);
ret = add_extent_mapping(&map_tree->map_tree, em);
- BUG_ON(ret);
spin_unlock(&map_tree->map_tree.lock);
+ BUG_ON(ret);
free_extent_map(em);
return 0;
device->sector_size = btrfs_device_sector_size(leaf, dev_item);
ptr = (unsigned long)btrfs_device_uuid(dev_item);
- read_extent_buffer(leaf, device->uuid, ptr, BTRFS_DEV_UUID_SIZE);
+ read_extent_buffer(leaf, device->uuid, ptr, BTRFS_UUID_SIZE);
return 0;
}
struct btrfs_device *device;
u64 devid;
int ret;
+ u8 dev_uuid[BTRFS_UUID_SIZE];
devid = btrfs_device_id(leaf, dev_item);
- device = btrfs_find_device(root, devid);
+ read_extent_buffer(leaf, dev_uuid,
+ (unsigned long)btrfs_device_uuid(dev_item),
+ BTRFS_UUID_SIZE);
+ device = btrfs_find_device(root, devid, dev_uuid);
if (!device) {
- printk("warning devid %Lu not found already\n", devid);
- device = kmalloc(sizeof(*device), GFP_NOFS);
+ printk("warning devid %Lu missing\n", devid);
+ device = add_missing_dev(root, devid, dev_uuid);
if (!device)
return -ENOMEM;
- list_add(&device->dev_list,
- &root->fs_info->fs_devices->devices);
}
fill_device_from_item(leaf, dev_item, device);
device->dev_root = root->fs_info->dev_root;
+ device->in_fs_metadata = 1;
ret = 0;
#if 0
ret = btrfs_open_device(device);
int btrfs_read_sys_array(struct btrfs_root *root)
{
struct btrfs_super_block *super_copy = &root->fs_info->super_copy;
- struct extent_buffer *sb = root->fs_info->sb_buffer;
+ struct extent_buffer *sb;
struct btrfs_disk_key *disk_key;
struct btrfs_chunk *chunk;
- struct btrfs_key key;
+ u8 *ptr;
+ unsigned long sb_ptr;
+ int ret = 0;
u32 num_stripes;
u32 array_size;
u32 len = 0;
- u8 *ptr;
- unsigned long sb_ptr;
u32 cur;
- int ret;
+ struct btrfs_key key;
+ sb = btrfs_find_create_tree_block(root, BTRFS_SUPER_INFO_OFFSET,
+ BTRFS_SUPER_INFO_SIZE);
+ if (!sb)
+ return -ENOMEM;
+ btrfs_set_buffer_uptodate(sb);
+ write_extent_buffer(sb, super_copy, 0, BTRFS_SUPER_INFO_SIZE);
array_size = btrfs_super_sys_array_size(super_copy);
- /*
- * we do this loop twice, once for the device items and
- * once for all of the chunks. This way there are device
- * structs filled in for every chunk
- */
ptr = super_copy->sys_chunk_array;
sb_ptr = offsetof(struct btrfs_super_block, sys_chunk_array);
cur = 0;
disk_key = (struct btrfs_disk_key *)ptr;
btrfs_disk_key_to_cpu(&key, disk_key);
- len = sizeof(*disk_key);
- ptr += len;
+ len = sizeof(*disk_key); ptr += len;
sb_ptr += len;
cur += len;
if (key.type == BTRFS_CHUNK_ITEM_KEY) {
chunk = (struct btrfs_chunk *)sb_ptr;
ret = read_one_chunk(root, &key, sb, chunk);
- BUG_ON(ret);
+ if (ret)
+ break;
num_stripes = btrfs_chunk_num_stripes(sb, chunk);
len = btrfs_chunk_item_size(num_stripes);
} else {
- BUG();
+ ret = -EIO;
+ break;
}
ptr += len;
sb_ptr += len;
cur += len;
}
- return 0;
+ free_extent_buffer(sb);
+ return ret;
}
int btrfs_read_chunk_tree(struct btrfs_root *root)
git.openpandora.org / pandora-kernel.git / blobdiff