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btrfs: update comment for btrfs_dirty_pages 

The original comment is from the initial merge, which has several
problems:

- No holes check any more
- No inline decision is made

Update the out-of-date comment with more correct one.

Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Qu Wenruo 2021-01-06 09:01:42 +08:00 committed by David Sterba
parent 6bc5636a67
commit c0fab48095
1 changed files with 5 additions and 6 deletions
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11
fs/btrfs/file.c
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@ -453,12 +453,11 @@ static void btrfs_drop_pages(struct page **pages, size_t num_pages)
}
/*
* after copy_from_user, pages need to be dirtied and we need to make
* sure holes are created between the current EOF and the start of
* any next extents (if required).
*
* this also makes the decision about creating an inline extent vs
* doing real data extents, marking pages dirty and delalloc as required.
* After btrfs_copy_from_user(), update the following things for delalloc:
* - Mark newly dirtied pages as DELALLOC in the io tree.
* Used to advise which range is to be written back.
* - Mark modified pages as Uptodate/Dirty and not needing COW fixup
* - Update inode size for past EOF write
*/
int btrfs_dirty_pages(struct btrfs_inode *inode, struct page **pages,
size_t num_pages, loff_t pos, size_t write_bytes,