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btrfs: update function comment for btrfs_check_nocow_lock()

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The documentation for the @nowait parameter is missing, so add it.
The @nowait parameter was added in commit 80f9d24130 ("btrfs: make
btrfs_check_nocow_lock nowait compatible"), which forgot to update the
function comment.

Reviewed-by: Boris Burkov <boris@bur.io>
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 2025-07-09 15:03:54 +01:00 committed by David Sterba
parent 601ea9c42a
commit c6482cff95
1 changed files with 3 additions and 1 deletions
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4
fs/btrfs/file.c
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@ -962,6 +962,7 @@ lock_and_cleanup_extent_if_need(struct btrfs_inode *inode, struct folio *folio,
* @pos: File offset.
* @write_bytes: The length to write, will be updated to the nocow writeable
* range.
* @nowait: Indicate if we can block or not (non-blocking IO context).
*
* This function will flush ordered extents in the range to ensure proper
* nocow checks.
@ -970,7 +971,8 @@ lock_and_cleanup_extent_if_need(struct btrfs_inode *inode, struct folio *folio,
* > 0 If we can nocow, and updates @write_bytes.
* 0 If we can't do a nocow write.
* -EAGAIN If we can't do a nocow write because snapshoting of the inode's
* root is in progress.
* root is in progress or because we are in a non-blocking IO
* context and need to block (@nowait is true).
* < 0 If an error happened.
*
* NOTE: Callers need to call btrfs_check_nocow_unlock() if we return > 0.