#include <linux/freezer.h>
#include <linux/crc32c.h>
#include <linux/slab.h>
+ #include <linux/migrate.h>
#include "compat.h"
#include "ctree.h"
#include "disk-io.h"
ret = btree_read_extent_buffer_pages(root, eb, start + PAGE_CACHE_SIZE,
btrfs_header_generation(eb));
BUG_ON(ret);
+ WARN_ON(!btrfs_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN));
+
found_start = btrfs_header_bytenr(eb);
if (found_start != start) {
WARN_ON(1);
__btree_submit_bio_done);
}
+ static int btree_migratepage(struct address_space *mapping,
+ struct page *newpage, struct page *page)
+ {
+ /*
+ * we can't safely write a btree page from here,
+ * we haven't done the locking hook
+ */
+ if (PageDirty(page))
+ return -EAGAIN;
+ /*
+ * Buffers may be managed in a filesystem specific way.
+ * We must have no buffers or drop them.
+ */
+ if (page_has_private(page) &&
+ !try_to_release_page(page, GFP_KERNEL))
+ return -EAGAIN;
+ #ifdef CONFIG_MIGRATION
+ return migrate_page(mapping, newpage, page);
+ #else
+ return -ENOSYS;
+ #endif
+ }
+
static int btree_writepage(struct page *page, struct writeback_control *wbc)
{
struct extent_io_tree *tree;
}
redirty_page_for_writepage(wbc, page);
- eb = btrfs_find_tree_block(root, page_offset(page),
- PAGE_CACHE_SIZE);
+ eb = btrfs_find_tree_block(root, page_offset(page), PAGE_CACHE_SIZE);
WARN_ON(!eb);
was_dirty = test_and_set_bit(EXTENT_BUFFER_DIRTY, &eb->bflags);
.releasepage = btree_releasepage,
.invalidatepage = btree_invalidatepage,
.sync_page = block_sync_page,
+ #ifdef CONFIG_MIGRATION
+ .migratepage = btree_migratepage,
+ #endif
};
int readahead_tree_block(struct btrfs_root *root, u64 bytenr, u32 blocksize,
GFP_NOFS);
struct btrfs_root *csum_root = kzalloc(sizeof(struct btrfs_root),
GFP_NOFS);
- struct btrfs_root *tree_root = kzalloc(sizeof(struct btrfs_root),
- GFP_NOFS);
- struct btrfs_fs_info *fs_info = kzalloc(sizeof(*fs_info),
- GFP_NOFS);
+ struct btrfs_root *tree_root = btrfs_sb(sb);
+ struct btrfs_fs_info *fs_info = tree_root->fs_info;
struct btrfs_root *chunk_root = kzalloc(sizeof(struct btrfs_root),
GFP_NOFS);
struct btrfs_root *dev_root = kzalloc(sizeof(struct btrfs_root),
if (uptodate) {
set_buffer_uptodate(bh);
} else {
- if (!buffer_eopnotsupp(bh) && printk_ratelimit()) {
+ if (printk_ratelimit()) {
printk(KERN_WARNING "lost page write due to "
"I/O error on %s\n",
bdevname(bh->b_bdev, b));
bh->b_end_io = btrfs_end_buffer_write_sync;
}
- if (i == last_barrier && do_barriers && device->barriers) {
- ret = submit_bh(WRITE_BARRIER, bh);
- if (ret == -EOPNOTSUPP) {
- printk("btrfs: disabling barriers on dev %s\n",
- device->name);
- set_buffer_uptodate(bh);
- device->barriers = 0;
- /* one reference for submit_bh */
- get_bh(bh);
- lock_buffer(bh);
- ret = submit_bh(WRITE_SYNC, bh);
- }
- } else {
+ if (i == last_barrier && do_barriers)
+ ret = submit_bh(WRITE_FLUSH_FUA, bh);
+ else
ret = submit_bh(WRITE_SYNC, bh);
- }
if (ret)
errors++;
bio_put(bio);
}
- static struct bio *
- extent_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs,
- gfp_t gfp_flags)
+ struct bio *
+ btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs,
+ gfp_t gfp_flags)
{
struct bio *bio;
else
nr = bio_get_nr_vecs(bdev);
- bio = extent_bio_alloc(bdev, sector, nr, GFP_NOFS | __GFP_HIGH);
+ bio = btrfs_bio_alloc(bdev, sector, nr, GFP_NOFS | __GFP_HIGH);
bio_add_page(bio, page, page_size, offset);
bio->bi_end_io = end_io_func;
int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
__u64 start, __u64 len, get_extent_t *get_extent)
{
- int ret;
+ int ret = 0;
u64 off = start;
u64 max = start + len;
u32 flags = 0;
+ u32 found_type;
+ u64 last;
u64 disko = 0;
+ struct btrfs_key found_key;
struct extent_map *em = NULL;
struct extent_state *cached_state = NULL;
+ struct btrfs_path *path;
+ struct btrfs_file_extent_item *item;
int end = 0;
u64 em_start = 0, em_len = 0;
unsigned long emflags;
- ret = 0;
+ int hole = 0;
if (len == 0)
return -EINVAL;
+ path = btrfs_alloc_path();
+ if (!path)
+ return -ENOMEM;
+ path->leave_spinning = 1;
+
+ ret = btrfs_lookup_file_extent(NULL, BTRFS_I(inode)->root,
+ path, inode->i_ino, -1, 0);
+ if (ret < 0) {
+ btrfs_free_path(path);
+ return ret;
+ }
+ WARN_ON(!ret);
+ path->slots[0]--;
+ item = btrfs_item_ptr(path->nodes[0], path->slots[0],
+ struct btrfs_file_extent_item);
+ btrfs_item_key_to_cpu(path->nodes[0], &found_key, path->slots[0]);
+ found_type = btrfs_key_type(&found_key);
+
+ /* No extents, just return */
+ if (found_key.objectid != inode->i_ino ||
+ found_type != BTRFS_EXTENT_DATA_KEY) {
+ btrfs_free_path(path);
+ return 0;
+ }
+ last = found_key.offset;
+ btrfs_free_path(path);
+
lock_extent_bits(&BTRFS_I(inode)->io_tree, start, start + len, 0,
&cached_state, GFP_NOFS);
em = get_extent(inode, NULL, 0, off, max - off, 0);
ret = PTR_ERR(em);
goto out;
}
+
while (!end) {
+ hole = 0;
off = em->start + em->len;
if (off >= max)
end = 1;
+ if (em->block_start == EXTENT_MAP_HOLE) {
+ hole = 1;
+ goto next;
+ }
+
em_start = em->start;
em_len = em->len;
if (em->block_start == EXTENT_MAP_LAST_BYTE) {
end = 1;
flags |= FIEMAP_EXTENT_LAST;
- } else if (em->block_start == EXTENT_MAP_HOLE) {
- flags |= FIEMAP_EXTENT_UNWRITTEN;
} else if (em->block_start == EXTENT_MAP_INLINE) {
flags |= (FIEMAP_EXTENT_DATA_INLINE |
FIEMAP_EXTENT_NOT_ALIGNED);
if (test_bit(EXTENT_FLAG_COMPRESSED, &em->flags))
flags |= FIEMAP_EXTENT_ENCODED;
+ next:
emflags = em->flags;
free_extent_map(em);
em = NULL;
-
if (!end) {
em = get_extent(inode, NULL, 0, off, max - off, 0);
if (!em)
}
emflags = em->flags;
}
+
if (test_bit(EXTENT_FLAG_VACANCY, &emflags)) {
flags |= FIEMAP_EXTENT_LAST;
end = 1;
}
- ret = fiemap_fill_next_extent(fieinfo, em_start, disko,
- em_len, flags);
- if (ret)
- goto out_free;
+ if (em_start == last) {
+ flags |= FIEMAP_EXTENT_LAST;
+ end = 1;
+ }
+
+ if (!hole) {
+ ret = fiemap_fill_next_extent(fieinfo, em_start, disko,
+ em_len, flags);
+ if (ret)
+ goto out_free;
+ }
}
out_free:
free_extent_map(em);
eb->len = len;
spin_lock_init(&eb->lock);
init_waitqueue_head(&eb->lock_wq);
- INIT_RCU_HEAD(&eb->rcu_head);
#if LEAK_DEBUG
spin_lock_irqsave(&leak_lock, flags);
spin_lock(&tree->buffer_lock);
eb = radix_tree_lookup(&tree->buffer, start >> PAGE_CACHE_SHIFT);
- if (!eb)
- goto out;
+ if (!eb) {
+ spin_unlock(&tree->buffer_lock);
+ return ret;
+ }
if (test_bit(EXTENT_BUFFER_DIRTY, &eb->bflags)) {
ret = 0;
p = &root->inode_tree.rb_node;
parent = NULL;
- if (hlist_unhashed(&inode->i_hash))
+ if (inode_unhashed(inode))
return;
spin_lock(&root->inode_lock);
BTRFS_I(inode)->index_cnt = 2;
BTRFS_I(inode)->root = root;
BTRFS_I(inode)->generation = trans->transid;
+ inode->i_generation = BTRFS_I(inode)->generation;
btrfs_set_inode_space_info(root, inode);
if (mode & S_IFDIR)
}
static int btrfs_add_nondir(struct btrfs_trans_handle *trans,
- struct dentry *dentry, struct inode *inode,
- int backref, u64 index)
+ struct inode *dir, struct dentry *dentry,
+ struct inode *inode, int backref, u64 index)
{
- int err = btrfs_add_link(trans, dentry->d_parent->d_inode,
- inode, dentry->d_name.name,
- dentry->d_name.len, backref, index);
+ int err = btrfs_add_link(trans, dir, inode,
+ dentry->d_name.name, dentry->d_name.len,
+ backref, index);
if (!err) {
d_instantiate(dentry, inode);
return 0;
btrfs_set_trans_block_group(trans, dir);
inode = btrfs_new_inode(trans, root, dir, dentry->d_name.name,
- dentry->d_name.len,
- dentry->d_parent->d_inode->i_ino, objectid,
+ dentry->d_name.len, dir->i_ino, objectid,
BTRFS_I(dir)->block_group, mode, &index);
err = PTR_ERR(inode);
if (IS_ERR(inode))
}
btrfs_set_trans_block_group(trans, inode);
- err = btrfs_add_nondir(trans, dentry, inode, 0, index);
+ err = btrfs_add_nondir(trans, dir, dentry, inode, 0, index);
if (err)
drop_inode = 1;
else {
btrfs_set_trans_block_group(trans, dir);
inode = btrfs_new_inode(trans, root, dir, dentry->d_name.name,
- dentry->d_name.len,
- dentry->d_parent->d_inode->i_ino,
- objectid, BTRFS_I(dir)->block_group, mode,
- &index);
+ dentry->d_name.len, dir->i_ino, objectid,
+ BTRFS_I(dir)->block_group, mode, &index);
err = PTR_ERR(inode);
if (IS_ERR(inode))
goto out_unlock;
}
btrfs_set_trans_block_group(trans, inode);
- err = btrfs_add_nondir(trans, dentry, inode, 0, index);
+ err = btrfs_add_nondir(trans, dir, dentry, inode, 0, index);
if (err)
drop_inode = 1;
else {
return -EPERM;
btrfs_inc_nlink(inode);
+ inode->i_ctime = CURRENT_TIME;
err = btrfs_set_inode_index(dir, &index);
if (err)
}
btrfs_set_trans_block_group(trans, dir);
- atomic_inc(&inode->i_count);
+ ihold(inode);
- err = btrfs_add_nondir(trans, dentry, inode, 1, index);
+ err = btrfs_add_nondir(trans, dir, dentry, inode, 1, index);
if (err) {
drop_inode = 1;
} else {
+ struct dentry *parent = dget_parent(dentry);
btrfs_update_inode_block_group(trans, dir);
err = btrfs_update_inode(trans, root, inode);
BUG_ON(err);
- btrfs_log_new_name(trans, inode, NULL, dentry->d_parent);
+ btrfs_log_new_name(trans, inode, NULL, parent);
+ dput(parent);
}
nr = trans->blocks_used;
btrfs_set_trans_block_group(trans, dir);
inode = btrfs_new_inode(trans, root, dir, dentry->d_name.name,
- dentry->d_name.len,
- dentry->d_parent->d_inode->i_ino, objectid,
+ dentry->d_name.len, dir->i_ino, objectid,
BTRFS_I(dir)->block_group, S_IFDIR | mode,
&index);
if (IS_ERR(inode)) {
if (err)
goto out_fail;
- err = btrfs_add_link(trans, dentry->d_parent->d_inode,
- inode, dentry->d_name.name,
- dentry->d_name.len, 0, index);
+ err = btrfs_add_link(trans, dir, inode, dentry->d_name.name,
+ dentry->d_name.len, 0, index);
if (err)
goto out_fail;
u64 bytes;
u32 *csums;
void *private;
+
+ /* number of bios pending for this dio */
+ atomic_t pending_bios;
+
+ /* IO errors */
+ int errors;
+
+ struct bio *orig_bio;
};
static void btrfs_endio_direct_read(struct bio *bio, int err)
{
+ struct btrfs_dio_private *dip = bio->bi_private;
struct bio_vec *bvec_end = bio->bi_io_vec + bio->bi_vcnt - 1;
struct bio_vec *bvec = bio->bi_io_vec;
- struct btrfs_dio_private *dip = bio->bi_private;
struct inode *inode = dip->inode;
struct btrfs_root *root = BTRFS_I(inode)->root;
u64 start;
struct btrfs_trans_handle *trans;
struct btrfs_ordered_extent *ordered = NULL;
struct extent_state *cached_state = NULL;
+ u64 ordered_offset = dip->logical_offset;
+ u64 ordered_bytes = dip->bytes;
int ret;
if (err)
goto out_done;
-
- ret = btrfs_dec_test_ordered_pending(inode, &ordered,
- dip->logical_offset, dip->bytes);
+ again:
+ ret = btrfs_dec_test_first_ordered_pending(inode, &ordered,
+ &ordered_offset,
+ ordered_bytes);
if (!ret)
- goto out_done;
+ goto out_test;
BUG_ON(!ordered);
out:
btrfs_delalloc_release_metadata(inode, ordered->len);
btrfs_end_transaction(trans, root);
+ ordered_offset = ordered->file_offset + ordered->len;
btrfs_put_ordered_extent(ordered);
btrfs_put_ordered_extent(ordered);
+
+ out_test:
+ /*
+ * our bio might span multiple ordered extents. If we haven't
+ * completed the accounting for the whole dio, go back and try again
+ */
+ if (ordered_offset < dip->logical_offset + dip->bytes) {
+ ordered_bytes = dip->logical_offset + dip->bytes -
+ ordered_offset;
+ goto again;
+ }
out_done:
bio->bi_private = dip->private;
return 0;
}
+ static void btrfs_end_dio_bio(struct bio *bio, int err)
+ {
+ struct btrfs_dio_private *dip = bio->bi_private;
+
+ if (err) {
+ printk(KERN_ERR "btrfs direct IO failed ino %lu rw %lu "
+ "disk_bytenr %lu len %u err no %d\n",
+ dip->inode->i_ino, bio->bi_rw, bio->bi_sector,
+ bio->bi_size, err);
+ dip->errors = 1;
+
+ /*
+ * before atomic variable goto zero, we must make sure
+ * dip->errors is perceived to be set.
+ */
+ smp_mb__before_atomic_dec();
+ }
+
+ /* if there are more bios still pending for this dio, just exit */
+ if (!atomic_dec_and_test(&dip->pending_bios))
+ goto out;
+
+ if (dip->errors)
+ bio_io_error(dip->orig_bio);
+ else {
+ set_bit(BIO_UPTODATE, &dip->orig_bio->bi_flags);
+ bio_endio(dip->orig_bio, 0);
+ }
+ out:
+ bio_put(bio);
+ }
+
+ static struct bio *btrfs_dio_bio_alloc(struct block_device *bdev,
+ u64 first_sector, gfp_t gfp_flags)
+ {
+ int nr_vecs = bio_get_nr_vecs(bdev);
+ return btrfs_bio_alloc(bdev, first_sector, nr_vecs, gfp_flags);
+ }
+
+ static inline int __btrfs_submit_dio_bio(struct bio *bio, struct inode *inode,
+ int rw, u64 file_offset, int skip_sum,
+ u32 *csums)
+ {
+ int write = rw & REQ_WRITE;
+ struct btrfs_root *root = BTRFS_I(inode)->root;
+ int ret;
+
+ bio_get(bio);
+ ret = btrfs_bio_wq_end_io(root->fs_info, bio, 0);
+ if (ret)
+ goto err;
+
+ if (write && !skip_sum) {
+ ret = btrfs_wq_submit_bio(root->fs_info,
+ inode, rw, bio, 0, 0,
+ file_offset,
+ __btrfs_submit_bio_start_direct_io,
+ __btrfs_submit_bio_done);
+ goto err;
+ } else if (!skip_sum)
+ btrfs_lookup_bio_sums_dio(root, inode, bio,
+ file_offset, csums);
+
+ ret = btrfs_map_bio(root, rw, bio, 0, 1);
+ err:
+ bio_put(bio);
+ return ret;
+ }
+
+ static int btrfs_submit_direct_hook(int rw, struct btrfs_dio_private *dip,
+ int skip_sum)
+ {
+ struct inode *inode = dip->inode;
+ struct btrfs_root *root = BTRFS_I(inode)->root;
+ struct btrfs_mapping_tree *map_tree = &root->fs_info->mapping_tree;
+ struct bio *bio;
+ struct bio *orig_bio = dip->orig_bio;
+ struct bio_vec *bvec = orig_bio->bi_io_vec;
+ u64 start_sector = orig_bio->bi_sector;
+ u64 file_offset = dip->logical_offset;
+ u64 submit_len = 0;
+ u64 map_length;
+ int nr_pages = 0;
+ u32 *csums = dip->csums;
+ int ret = 0;
+
+ bio = btrfs_dio_bio_alloc(orig_bio->bi_bdev, start_sector, GFP_NOFS);
+ if (!bio)
+ return -ENOMEM;
+ bio->bi_private = dip;
+ bio->bi_end_io = btrfs_end_dio_bio;
+ atomic_inc(&dip->pending_bios);
+
+ map_length = orig_bio->bi_size;
+ ret = btrfs_map_block(map_tree, READ, start_sector << 9,
+ &map_length, NULL, 0);
+ if (ret) {
+ bio_put(bio);
+ return -EIO;
+ }
+
+ while (bvec <= (orig_bio->bi_io_vec + orig_bio->bi_vcnt - 1)) {
+ if (unlikely(map_length < submit_len + bvec->bv_len ||
+ bio_add_page(bio, bvec->bv_page, bvec->bv_len,
+ bvec->bv_offset) < bvec->bv_len)) {
+ /*
+ * inc the count before we submit the bio so
+ * we know the end IO handler won't happen before
+ * we inc the count. Otherwise, the dip might get freed
+ * before we're done setting it up
+ */
+ atomic_inc(&dip->pending_bios);
+ ret = __btrfs_submit_dio_bio(bio, inode, rw,
+ file_offset, skip_sum,
+ csums);
+ if (ret) {
+ bio_put(bio);
+ atomic_dec(&dip->pending_bios);
+ goto out_err;
+ }
+
+ if (!skip_sum)
+ csums = csums + nr_pages;
+ start_sector += submit_len >> 9;
+ file_offset += submit_len;
+
+ submit_len = 0;
+ nr_pages = 0;
+
+ bio = btrfs_dio_bio_alloc(orig_bio->bi_bdev,
+ start_sector, GFP_NOFS);
+ if (!bio)
+ goto out_err;
+ bio->bi_private = dip;
+ bio->bi_end_io = btrfs_end_dio_bio;
+
+ map_length = orig_bio->bi_size;
+ ret = btrfs_map_block(map_tree, READ, start_sector << 9,
+ &map_length, NULL, 0);
+ if (ret) {
+ bio_put(bio);
+ goto out_err;
+ }
+ } else {
+ submit_len += bvec->bv_len;
+ nr_pages ++;
+ bvec++;
+ }
+ }
+
+ ret = __btrfs_submit_dio_bio(bio, inode, rw, file_offset, skip_sum,
+ csums);
+ if (!ret)
+ return 0;
+
+ bio_put(bio);
+ out_err:
+ dip->errors = 1;
+ /*
+ * before atomic variable goto zero, we must
+ * make sure dip->errors is perceived to be set.
+ */
+ smp_mb__before_atomic_dec();
+ if (atomic_dec_and_test(&dip->pending_bios))
+ bio_io_error(dip->orig_bio);
+
+ /* bio_end_io() will handle error, so we needn't return it */
+ return 0;
+ }
+
static void btrfs_submit_direct(int rw, struct bio *bio, struct inode *inode,
loff_t file_offset)
{
dip->disk_bytenr = (u64)bio->bi_sector << 9;
bio->bi_private = dip;
+ dip->errors = 0;
+ dip->orig_bio = bio;
+ atomic_set(&dip->pending_bios, 0);
if (write)
bio->bi_end_io = btrfs_endio_direct_write;
else
bio->bi_end_io = btrfs_endio_direct_read;
- ret = btrfs_bio_wq_end_io(root->fs_info, bio, 0);
- if (ret)
- goto out_err;
-
- if (write && !skip_sum) {
- ret = btrfs_wq_submit_bio(BTRFS_I(inode)->root->fs_info,
- inode, rw, bio, 0, 0,
- dip->logical_offset,
- __btrfs_submit_bio_start_direct_io,
- __btrfs_submit_bio_done);
- if (ret)
- goto out_err;
+ ret = btrfs_submit_direct_hook(rw, dip, skip_sum);
+ if (!ret)
return;
- } else if (!skip_sum)
- btrfs_lookup_bio_sums_dio(root, inode, bio,
- dip->logical_offset, dip->csums);
-
- ret = btrfs_map_bio(root, rw, bio, 0, 1);
- if (ret)
- goto out_err;
- return;
- out_err:
- kfree(dip->csums);
- kfree(dip);
free_ordered:
/*
* If this is a write, we need to clean up the reserved space and kill
BUG_ON(ret);
if (old_inode->i_ino != BTRFS_FIRST_FREE_OBJECTID) {
- btrfs_log_new_name(trans, old_inode, old_dir,
- new_dentry->d_parent);
+ struct dentry *parent = dget_parent(new_dentry);
+ btrfs_log_new_name(trans, old_inode, old_dir, parent);
+ dput(parent);
btrfs_end_log_trans(root);
}
out_fail:
btrfs_set_trans_block_group(trans, dir);
inode = btrfs_new_inode(trans, root, dir, dentry->d_name.name,
- dentry->d_name.len,
- dentry->d_parent->d_inode->i_ino, objectid,
+ dentry->d_name.len, dir->i_ino, objectid,
BTRFS_I(dir)->block_group, S_IFLNK|S_IRWXUGO,
&index);
err = PTR_ERR(inode);
}
btrfs_set_trans_block_group(trans, inode);
- err = btrfs_add_nondir(trans, dentry, inode, 0, index);
+ err = btrfs_add_nondir(trans, dir, dentry, inode, 0, index);
if (err)
drop_inode = 1;
else {
struct btrfs_root *root = BTRFS_I(inode)->root;
struct btrfs_key ins;
u64 cur_offset = start;
+ u64 i_size;
int ret = 0;
bool own_trans = true;
(actual_len > inode->i_size) &&
(cur_offset > inode->i_size)) {
if (cur_offset > actual_len)
- i_size_write(inode, actual_len);
+ i_size = actual_len;
else
- i_size_write(inode, cur_offset);
- i_size_write(inode, cur_offset);
- btrfs_ordered_update_i_size(inode, cur_offset, NULL);
+ i_size = cur_offset;
+ i_size_write(inode, i_size);
+ btrfs_ordered_update_i_size(inode, i_size, NULL);
}
ret = btrfs_update_inode(trans, root, inode);
btrfs_wait_ordered_range(inode, alloc_start, alloc_end - alloc_start);
mutex_lock(&inode->i_mutex);
+ ret = inode_newsize_ok(inode, alloc_end);
+ if (ret)
+ goto out;
+
if (alloc_start > inode->i_size) {
ret = btrfs_cont_expand(inode, alloc_start);
if (ret)
.readlink = generic_readlink,
.follow_link = page_follow_link_light,
.put_link = page_put_link,
+ .getattr = btrfs_getattr,
.permission = btrfs_permission,
.setxattr = btrfs_setxattr,
.getxattr = btrfs_getxattr,
case Opt_space_cache:
printk(KERN_INFO "btrfs: enabling disk space caching\n");
btrfs_set_opt(info->mount_opt, SPACE_CACHE);
+ break;
case Opt_clear_cache:
printk(KERN_INFO "btrfs: force clearing of disk cache\n");
btrfs_set_opt(info->mount_opt, CLEAR_CACHE);
static int btrfs_test_super(struct super_block *s, void *data)
{
- struct btrfs_fs_devices *test_fs_devices = data;
+ struct btrfs_root *test_root = data;
struct btrfs_root *root = btrfs_sb(s);
- return root->fs_info->fs_devices == test_fs_devices;
+ /*
+ * If this super block is going away, return false as it
+ * can't match as an existing super block.
+ */
+ if (!atomic_read(&s->s_active))
+ return 0;
+ return root->fs_info->fs_devices == test_root->fs_info->fs_devices;
+ }
+
+ static int btrfs_set_super(struct super_block *s, void *data)
+ {
+ s->s_fs_info = data;
+
+ return set_anon_super(s, data);
}
+
/*
* Find a superblock for the given device / mount point.
*
* Note: This is based on get_sb_bdev from fs/super.c with a few additions
* for multiple device setup. Make sure to keep it in sync.
*/
-static int btrfs_get_sb(struct file_system_type *fs_type, int flags,
- const char *dev_name, void *data, struct vfsmount *mnt)
+static struct dentry *btrfs_mount(struct file_system_type *fs_type, int flags,
+ const char *dev_name, void *data)
{
struct block_device *bdev = NULL;
struct super_block *s;
struct dentry *root;
struct btrfs_fs_devices *fs_devices = NULL;
+ struct btrfs_root *tree_root = NULL;
+ struct btrfs_fs_info *fs_info = NULL;
fmode_t mode = FMODE_READ;
char *subvol_name = NULL;
u64 subvol_objectid = 0;
&subvol_name, &subvol_objectid,
&fs_devices);
if (error)
- return error;
+ return ERR_PTR(error);
error = btrfs_scan_one_device(dev_name, mode, fs_type, &fs_devices);
if (error)
goto error_close_devices;
}
+ /*
+ * Setup a dummy root and fs_info for test/set super. This is because
+ * we don't actually fill this stuff out until open_ctree, but we need
+ * it for searching for existing supers, so this lets us do that and
+ * then open_ctree will properly initialize everything later.
+ */
+ fs_info = kzalloc(sizeof(struct btrfs_fs_info), GFP_NOFS);
+ tree_root = kzalloc(sizeof(struct btrfs_root), GFP_NOFS);
+ if (!fs_info || !tree_root) {
+ error = -ENOMEM;
+ goto error_close_devices;
+ }
+ fs_info->tree_root = tree_root;
+ fs_info->fs_devices = fs_devices;
+ tree_root->fs_info = fs_info;
+
bdev = fs_devices->latest_bdev;
- s = sget(fs_type, btrfs_test_super, set_anon_super, fs_devices);
+ s = sget(fs_type, btrfs_test_super, btrfs_set_super, tree_root);
if (IS_ERR(s))
goto error_s;
root = new_root;
}
- mnt->mnt_sb = s;
- mnt->mnt_root = root;
-
kfree(subvol_name);
- return 0;
+ return root;
error_s:
error = PTR_ERR(s);
error_close_devices:
btrfs_close_devices(fs_devices);
+ kfree(fs_info);
+ kfree(tree_root);
error_free_subvol_name:
kfree(subvol_name);
- return error;
+ return ERR_PTR(error);
}
static int btrfs_remount(struct super_block *sb, int *flags, char *data)
static struct file_system_type btrfs_fs_type = {
.owner = THIS_MODULE,
.name = "btrfs",
- .get_sb = btrfs_get_sb,
+ .mount = btrfs_mount,
.kill_sb = kill_anon_super,
.fs_flags = FS_REQUIRES_DEV,
};
.unlocked_ioctl = btrfs_control_ioctl,
.compat_ioctl = btrfs_control_ioctl,
.owner = THIS_MODULE,
+ .llseek = noop_llseek,
};
static struct miscdevice btrfs_misc = {
git.openpandora.org / pandora-kernel.git / commitdiff