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.
Signed-off-by: Zhang Yi <yi.zhang@xxxxxxxxxx>
---
fs/ufs/balloc.c | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)
diff --git a/fs/ufs/balloc.c b/fs/ufs/balloc.c
index bd810d8239f2..bbc2159eece4 100644
--- a/fs/ufs/balloc.c
+++ b/fs/ufs/balloc.c
@@ -296,9 +296,7 @@ static void ufs_change_blocknr(struct inode *inode, sector_t beg,
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)) {
+ if (bh_read(bh, 0)) {
ufs_error(inode->i_sb, __func__,
"read of block failed\n");
break;
--
2.31.1
