The quilt patch titled
Subject: nilfs2: do not acquire rwsem in nilfs_bmap_write()
has been removed from the -mm tree. Its filename was
nilfs2-do-not-acquire-rwsem-in-nilfs_bmap_write.patch
This patch was dropped because it was merged into the mm-hotfixes-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
------------------------------------------------------
From: Ryusuke Konishi <konishi.ryusuke@xxxxxxxxx>
Subject: nilfs2: do not acquire rwsem in nilfs_bmap_write()
Date: Mon, 22 Jan 2024 23:01:56 +0900
It is now clear that nilfs_bmap_write() is only used to finalize logs
written to disk. Concurrent bmap modification operations are not
performed on bmaps in this context. Additionally, this function does not
modify data used in read-only operations such as bmap lookups.
Therefore, there is no need to acquire bmap->b_sem in nilfs_bmap_write(),
so delete it.
Link: https://lkml.kernel.org/r/20240122140202.6950-10-konishi.ryusuke@xxxxxxxxx
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/nilfs2/bmap.c | 3 ---
1 file changed, 3 deletions(-)
--- a/fs/nilfs2/bmap.c~nilfs2-do-not-acquire-rwsem-in-nilfs_bmap_write
+++ a/fs/nilfs2/bmap.c
@@ -548,13 +548,10 @@ int nilfs_bmap_read(struct nilfs_bmap *b
*/
void nilfs_bmap_write(struct nilfs_bmap *bmap, struct nilfs_inode *raw_inode)
{
- down_write(&bmap->b_sem);
memcpy(raw_inode->i_bmap, bmap->b_u.u_data,
NILFS_INODE_BMAP_SIZE * sizeof(__le64));
if (bmap->b_inode->i_ino == NILFS_DAT_INO)
bmap->b_last_allocated_ptr = NILFS_BMAP_NEW_PTR_INIT;
-
- up_write(&bmap->b_sem);
}
void nilfs_bmap_init_gc(struct nilfs_bmap *bmap)
_
Patches currently in -mm which might be from konishi.ryusuke@xxxxxxxxx are
