The patch titled
Subject: ufs: replace ll_rw_block()
has been added to the -mm mm-unstable branch. Its filename is
ufs-replace-ll_rw_block.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/ufs-replace-ll_rw_block.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Zhang Yi <yi.zhang@xxxxxxxxxx>
Subject: ufs: replace ll_rw_block()
Date: Thu, 1 Sep 2022 21:35:02 +0800
ll_rw_block() is not safe for the sync read path because it cannot
guarantee that submitting read IO if the buffer has been locked. We
could get false positive EIO after wait_on_buffer() if the buffer has
been locked by others. So stop using ll_rw_block() in ufs.
Link: https://lkml.kernel.org/r/20220901133505.2510834-12-yi.zhang@xxxxxxxxxx
Signed-off-by: Zhang Yi <yi.zhang@xxxxxxxxxx>
Reviewed-by: Jan Kara <jack@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/ufs/balloc.c | 12 ++++--------
1 file changed, 4 insertions(+), 8 deletions(-)
--- a/fs/ufs/balloc.c~ufs-replace-ll_rw_block
+++ a/fs/ufs/balloc.c
@@ -295,14 +295,10 @@ static void ufs_change_blocknr(struct in
if (!buffer_mapped(bh))
map_bh(bh, inode->i_sb, oldb + pos);
- if (!buffer_uptodate(bh)) {
- ll_rw_block(REQ_OP_READ, 1, &bh);
- wait_on_buffer(bh);
- if (!buffer_uptodate(bh)) {
- ufs_error(inode->i_sb, __func__,
- "read of block failed\n");
- break;
- }
+ if (bh_read(bh, 0) < 0) {
+ ufs_error(inode->i_sb, __func__,
+ "read of block failed\n");
+ break;
}
UFSD(" change from %llu to %llu, pos %u\n",
_
Patches currently in -mm which might be from yi.zhang@xxxxxxxxxx are
fs-buffer-remove-__breadahead_gfp.patch
fs-buffer-add-some-new-buffer-read-helpers.patch
fs-buffer-replace-ll_rw_block.patch
gfs2-replace-ll_rw_block.patch
isofs-replace-ll_rw_block.patch
jbd2-replace-ll_rw_block.patch
ntfs3-replace-ll_rw_block.patch
ocfs2-replace-ll_rw_block.patch
reiserfs-replace-ll_rw_block.patch
udf-replace-ll_rw_block.patch
ufs-replace-ll_rw_block.patch
fs-buffer-remove-ll_rw_block-helper.patch
ext2-replace-bh_submit_read-helper-with-bh_read_locked.patch
fs-buffer-remove-bh_submit_read-helper.patch
