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btrfs: update comment for btrfs_set_inode_full_sync() about locking

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Nowadays we have a lock used to synchronize mmap writes with reflink and
fsync operations (struct btrfs_inode::i_mmap_lock), so update the comment
for btrfs_set_inode_full_sync() to mention that it can also be called
while holding that mmap lock. Besides being a valid alternative to the
inode's VFS lock, we already have the extent map shrinker using that mmap
lock instead.

Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Filipe Manana 2024-04-09 16:41:05 +01:00 committed by David Sterba
parent 956a17d9d0
commit 65bb9fb00b
1 changed files with 5 additions and 3 deletions
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8
fs/btrfs/btrfs_inode.h
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@ -381,9 +381,11 @@ static inline void btrfs_set_inode_last_sub_trans(struct btrfs_inode *inode)
}
/*
* Should be called while holding the inode's VFS lock in exclusive mode or in a
* context where no one else can access the inode concurrently (during inode
* creation or when loading an inode from disk).
* Should be called while holding the inode's VFS lock in exclusive mode, or
* while holding the inode's mmap lock (struct btrfs_inode::i_mmap_lock) in
* either shared or exclusive mode, or in a context where no one else can access
* the inode concurrently (during inode creation or when loading an inode from
* disk).
*/
static inline void btrfs_set_inode_full_sync(struct btrfs_inode *inode)
{