diff options
| author | Josef Bacik <josef@toxicpanda.com> | 2020-08-20 18:46:03 +0300 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2020-10-07 13:12:16 +0300 |
| commit | 9631e4cc1a030aa71dea588cc9a57533b657489f (patch) | |
| tree | 79af53be50c85a8d2fa8aeb0ffb0662506d010c1 /fs/btrfs/ioctl.c | |
| parent | fd7ba1c1202d15ac96d7b42256550973e12686b5 (diff) | |
| download | linux-9631e4cc1a030aa71dea588cc9a57533b657489f.tar.xz | |
btrfs: introduce BTRFS_NESTING_COW for cow'ing blocks
When we COW a block we are holding a lock on the original block, and
then we lock the new COW block. Because our lockdep maps are based on
root + level, this will make lockdep complain. We need a way to
indicate a subclass for locking the COW'ed block, so plumb through our
btrfs_lock_nesting from btrfs_cow_block down to the btrfs_init_buffer,
and then introduce BTRFS_NESTING_COW to be used for cow'ing blocks.
The reason I've added all this extra infrastructure is because there
will be need of different nesting classes in follow up patches.
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs/ioctl.c')
| -rw-r--r-- | fs/btrfs/ioctl.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c index 3779a6c12184..b91444e810a5 100644 --- a/fs/btrfs/ioctl.c +++ b/fs/btrfs/ioctl.c @@ -628,7 +628,8 @@ static noinline int create_subvol(struct inode *dir, if (ret) goto fail; - leaf = btrfs_alloc_tree_block(trans, root, 0, objectid, NULL, 0, 0, 0); + leaf = btrfs_alloc_tree_block(trans, root, 0, objectid, NULL, 0, 0, 0, + BTRFS_NESTING_NORMAL); if (IS_ERR(leaf)) { ret = PTR_ERR(leaf); goto fail; |