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btrfs: update outdated comment at btrfs_orphan_cleanup() 

btrfs_orphan_cleanup() has a comment referring to find_dead_roots, but
function does not exists since commit cb517eabba ("Btrfs: cleanup the
similar code of the fs root read"). What we use now to find and load dead
roots is btrfs_find_orphan_roots(). So update the comment and make it a
bit more detailed about why we can not delete an orphan item for a root.

Signed-off-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Filipe Manana 2021-03-16 16:54:13 +00:00 committed by David Sterba
parent ffbc10a144
commit 0c0218e9a6
1 changed files with 11 additions and 7 deletions
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18
fs/btrfs/inode.c
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@ -3386,15 +3386,19 @@ int btrfs_orphan_cleanup(struct btrfs_root *root)
int is_dead_root = 0; int is_dead_root = 0;
/* /*
* this is an orphan in the tree root. Currently these * This is an orphan in the tree root. Currently these
* could come from 2 sources: * could come from 2 sources:
* a) a snapshot deletion in progress * a) a root (snapshot/subvolume) deletion in progress
* b) a free space cache inode * b) a free space cache inode
* We need to distinguish those two, as the snapshot * We need to distinguish those two, as the orphan item
* orphan must not get deleted. * for a root must not get deleted before the deletion
* find_dead_roots already ran before us, so if this * of the snapshot/subvolume's tree completes.
* is a snapshot deletion, we should find the root *
* in the fs_roots radix tree. * btrfs_find_orphan_roots() ran before us, which has
* found all deleted roots and loaded them into
* fs_info->fs_roots_radix. So here we can find if an
* orphan item corresponds to a deleted root by looking
* up the root from that radix tree.
*/ */
spin_lock(&fs_info->fs_roots_radix_lock); spin_lock(&fs_info->fs_roots_radix_lock);