The patch titled
Subject: FAT: use io_schedule_timeout() instead of congestion_wait()
has been added to the -mm tree. Its filename is
fat-use-io_schedule_timeout-instead-of-congestion_wait.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/fat-use-io_schedule_timeout-instead-of-congestion_wait.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/fat-use-io_schedule_timeout-instead-of-congestion_wait.patch
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------------------------------------------------------
From: "NeilBrown" <neilb@xxxxxxx>
Subject: FAT: use io_schedule_timeout() instead of congestion_wait()
congestion_wait() in this context is just a sleep - block devices do not
support congestion signalling any more.
The goal for this wait, which was introduced in Commit ae78bf9c4f5f
("[PATCH] add -o flush for fat") is to wait for any recently written data
to get to storage. We currently have no direct mechanism to do this, so a
simple wait that behaves identically to the current congestion_wait() is
the best we can do.
This is a step towards removing congestion_wait()
Link: https://lkml.kernel.org/r/163936544519.22433.13400436295732112065@xxxxxxxxxxxxxxxxxxxxx
Signed-off-by: NeilBrown <neilb@xxxxxxx>
Acked-by: OGAWA Hirofumi <hirofumi@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/fat/file.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
--- a/fs/fat/file.c~fat-use-io_schedule_timeout-instead-of-congestion_wait
+++ a/fs/fat/file.c
@@ -175,9 +175,10 @@ long fat_generic_ioctl(struct file *filp
static int fat_file_release(struct inode *inode, struct file *filp)
{
if ((filp->f_mode & FMODE_WRITE) &&
- MSDOS_SB(inode->i_sb)->options.flush) {
+ MSDOS_SB(inode->i_sb)->options.flush) {
fat_flush_inodes(inode->i_sb, inode, NULL);
- congestion_wait(BLK_RW_ASYNC, HZ/10);
+ set_current_state(TASK_UNINTERRUPTIBLE);
+ io_schedule_timeout(HZ/10);
}
return 0;
}
_
Patches currently in -mm which might be from neilb@xxxxxxx are
mm-discard-__gfp_atomic.patch
mm-introduce-memalloc_retry_wait.patch
fat-use-io_schedule_timeout-instead-of-congestion_wait.patch
