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btrfs: update outdated comment at btrfs_replace_file_extents()

Message ID 32f9e43d999fcfaa2927513d7563790a5292fd7b.1616764397.git.fdmanana@suse.com (mailing list archive)
State New
Headers show
Series btrfs: update outdated comment at btrfs_replace_file_extents() | expand

Commit Message

Filipe Manana March 26, 2021, 1:14 p.m. UTC
From: Filipe Manana <fdmanana@suse.com>

There is a comment at btrfs_replace_file_extents() that mentions that we
set the full sync flag on an inode when cloning into a file with a size
greater than or equals to 16MiB, through try_release_extent_mapping() when
we truncate the page cache after replacing file extents during a clone
operation.

That is not true anymore since commit 5e548b32018d96 ("btrfs: do not set
the full sync flag on the inode during page release"), so update the
comment to remove that part and rephrase it slightly to make it more
clear why the full sync flag is set at btrfs_replace_file_extents().

Signed-off-by: Filipe Manana <fdmanana@suse.com>
---
 fs/btrfs/file.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

Comments

David Sterba March 29, 2021, 6:10 p.m. UTC | #1
On Fri, Mar 26, 2021 at 01:14:41PM +0000, fdmanana@kernel.org wrote:
> From: Filipe Manana <fdmanana@suse.com>
> 
> There is a comment at btrfs_replace_file_extents() that mentions that we
> set the full sync flag on an inode when cloning into a file with a size
> greater than or equals to 16MiB, through try_release_extent_mapping() when
> we truncate the page cache after replacing file extents during a clone
> operation.
> 
> That is not true anymore since commit 5e548b32018d96 ("btrfs: do not set
> the full sync flag on the inode during page release"), so update the
> comment to remove that part and rephrase it slightly to make it more
> clear why the full sync flag is set at btrfs_replace_file_extents().
> 
> Signed-off-by: Filipe Manana <fdmanana@suse.com>

Added to misc-next, thanks.
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Patch

diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index c666d20370c1..42634658815f 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -2765,10 +2765,8 @@  int btrfs_replace_file_extents(struct btrfs_inode *inode,
 	/*
 	 * If we were cloning, force the next fsync to be a full one since we
 	 * we replaced (or just dropped in the case of cloning holes when
-	 * NO_HOLES is enabled) extents and extent maps.
-	 * This is for the sake of simplicity, and cloning into files larger
-	 * than 16Mb would force the full fsync any way (when
-	 * try_release_extent_mapping() is invoked during page cache truncation.
+	 * NO_HOLES is enabled) file extent items and did not setup new extent
+	 * maps for the replacement extents (or holes).
 	 */
 	if (extent_info && !extent_info->is_new_extent)
 		set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, &inode->runtime_flags);