samsung_sm8750/android_kernel_samsung_sm8750
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

iomap: skip unnecessary ifs_block_is_uptodate check

Browse Source 
[ Upstream commit 8e3c15ee0d292c413c66fe10201d1b035a0bea72 ]

In iomap_adjust_read_range, i is either the first !uptodate block, or it
is past last for the second loop looking for trailing uptodate blocks.
Assuming there's no overflow (there's no combination of huge folios and
tiny blksize) then yeah, there is no point in retesting that the same
block pointed to by i is uptodate since we hold the folio lock so nobody
else could have set it uptodate.

Signed-off-by: Gou Hao <gouhao@uniontech.com>
Link: https://lore.kernel.org/20250410071236.16017-1-gouhao@uniontech.com
Reviewed-by: "Darrick J. Wong" <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Suggested-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Gou Hao
2025-04-10 15:12:36 +08:00
committed by Greg Kroah-Hartman
parent bb7878cca9
commit ce7e04d26a
1 changed files with 1 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
fs/iomap/buffered-io.c
View File

@@ -224,7 +224,7 @@ static void iomap_adjust_read_range(struct inode *inode, struct folio *folio,
} }
/* truncate len if we find any trailing uptodate block(s) */ /* truncate len if we find any trailing uptodate block(s) */
for ( ; i <= last; i++) { while (++i <= last) {
if (ifs_block_is_uptodate(ifs, i)) { if (ifs_block_is_uptodate(ifs, i)) {
plen -= (last - i + 1) * block_size; plen -= (last - i + 1) * block_size;
last = i - 1; last = i - 1;