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-rw-r--r--fs/btrfs/inode.c20
1 files changed, 15 insertions, 5 deletions
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 486b1da2fc5c..1242d0aa108d 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -1359,6 +1359,8 @@ static int fallback_to_cow(struct inode *inode, struct page *locked_page,
const u64 start, const u64 end,
int *page_started, unsigned long *nr_written)
{
+ const bool is_space_ino = btrfs_is_free_space_inode(BTRFS_I(inode));
+ const u64 range_bytes = end + 1 - start;
struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
u64 range_start = start;
u64 count;
@@ -1386,19 +1388,27 @@ static int fallback_to_cow(struct inode *inode, struct page *locked_page,
* that if the COW path fails for any reason, it decrements (through
* extent_clear_unlock_delalloc()) the bytes_may_use counter of the
* data space info, which we incremented in the step above.
+ *
+ * If we need to fallback to cow and the inode corresponds to a free
+ * space cache inode, we must also increment bytes_may_use of the data
+ * space_info for the same reason. Space caches always get a prealloc
+ * extent for them, however scrub or balance may have set the block
+ * group that contains that extent to RO mode.
*/
- count = count_range_bits(io_tree, &range_start, end, end + 1 - start,
+ count = count_range_bits(io_tree, &range_start, end, range_bytes,
EXTENT_NORESERVE, 0);
- if (count > 0) {
+ if (count > 0 || is_space_ino) {
+ const u64 bytes = is_space_ino ? range_bytes : count;
struct btrfs_fs_info *fs_info = BTRFS_I(inode)->root->fs_info;
struct btrfs_space_info *sinfo = fs_info->data_sinfo;
spin_lock(&sinfo->lock);
- btrfs_space_info_update_bytes_may_use(fs_info, sinfo, count);
+ btrfs_space_info_update_bytes_may_use(fs_info, sinfo, bytes);
spin_unlock(&sinfo->lock);
- clear_extent_bit(io_tree, start, end, EXTENT_NORESERVE, 0, 0,
- NULL);
+ if (count > 0)
+ clear_extent_bit(io_tree, start, end, EXTENT_NORESERVE,
+ 0, 0, NULL);
}
return cow_file_range(inode, locked_page, start, end, page_started,