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Btrfs: check for duplicate entries in the free space cache 

If there are duplicate entries in the free space cache, discard the entire cache
and load it the old fashioned way.  Thanks,

Signed-off-by: Josef Bacik <josef@redhat.com>
This commit is contained in:
Josef Bacik 2011-05-13 14:49:23 -04:00
parent cca1c81f43
commit 207dde8289
1 changed files with 24 additions and 3 deletions
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27
fs/btrfs/free-space-cache.c
View File

@ -420,7 +420,14 @@ int load_free_space_cache(struct btrfs_fs_info *fs_info,
spin_lock(&block_group->tree_lock);
ret = link_free_space(block_group, e);
spin_unlock(&block_group->tree_lock);
BUG_ON(ret);
if (ret) {
printk(KERN_ERR "Duplicate entries in "
"free space cache, dumping\n");
kunmap(page);
unlock_page(page);
page_cache_release(page);
goto free_cache;
}
} else {
e->bitmap = kzalloc(PAGE_CACHE_SIZE, GFP_NOFS);
if (!e->bitmap) {
@ -437,6 +444,14 @@ int load_free_space_cache(struct btrfs_fs_info *fs_info,
recalculate_thresholds(block_group);
spin_unlock(&block_group->tree_lock);
list_add_tail(&e->list, &bitmaps);
if (ret) {
printk(KERN_ERR "Duplicate entries in "
"free space cache, dumping\n");
kunmap(page);
unlock_page(page);
page_cache_release(page);
goto free_cache;
}
}
num_entries--;
@ -909,10 +924,16 @@ static int tree_insert_offset(struct rb_root *root, u64 offset,
* logically.
*/
if (bitmap) {
WARN_ON(info->bitmap);
if (info->bitmap) {
WARN_ON_ONCE(1);
return -EEXIST;
}
p = &(*p)->rb_right;
} else {
WARN_ON(!info->bitmap);
if (!info->bitmap) {
WARN_ON_ONCE(1);
return -EEXIST;
}
p = &(*p)->rb_left;
}
}