diff mbox series

[3/3] fs: Drop wait_unfrozen wait queue

Message ID 168688012399.860947.1514236710068241356.stgit@frogsfrogsfrogs (mailing list archive)
State New, archived
Headers show
Series fs: kernel and userspace filesystem freeze | expand

Commit Message

Darrick J. Wong June 16, 2023, 1:48 a.m. UTC 
From: Jan Kara <jack@suse.cz>

wait_unfrozen waitqueue is used only in quota code to wait for
filesystem to become unfrozen. In that place we can just use
sb_start_write() - sb_end_write() pair to achieve the same. So just
remove the waitqueue.

Signed-off-by: Jan Kara <jack@suse.cz>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
---
 fs/quota/quota.c   |    5 +++--
 fs/super.c         |    4 ----
 include/linux/fs.h |    1 -
 3 files changed, 3 insertions(+), 7 deletions(-)

Comments

Dave Chinner June 16, 2023, 2:19 a.m. UTC | #1 
On Thu, Jun 15, 2023 at 06:48:44PM -0700, Darrick J. Wong wrote:
> From: Jan Kara <jack@suse.cz>
> 
> wait_unfrozen waitqueue is used only in quota code to wait for
> filesystem to become unfrozen. In that place we can just use
> sb_start_write() - sb_end_write() pair to achieve the same. So just
> remove the waitqueue.
> 
> Signed-off-by: Jan Kara <jack@suse.cz>
> Reviewed-by: Darrick J. Wong <djwong@kernel.org>
> Signed-off-by: Darrick J. Wong <djwong@kernel.org>
> ---
>  fs/quota/quota.c   |    5 +++--
>  fs/super.c         |    4 ----
>  include/linux/fs.h |    1 -
>  3 files changed, 3 insertions(+), 7 deletions(-)

Yup, nice simplification.

Reviewed-by: Dave Chinner <dchinner@redhat.com>
Christoph Hellwig June 16, 2023, 5:52 a.m. UTC | #2 
Looks good:

Reviewed-by: Christoph Hellwig <hch@lst.de>
diff mbox series

Patch

diff --git a/fs/quota/quota.c b/fs/quota/quota.c
index 052f143e2e0e..0e41fb84060f 100644
--- a/fs/quota/quota.c
+++ b/fs/quota/quota.c
@@ -895,8 +895,9 @@  static struct super_block *quotactl_block(const char __user *special, int cmd)
 			up_write(&sb->s_umount);
 		else
 			up_read(&sb->s_umount);
-		wait_event(sb->s_writers.wait_unfrozen,
-			   sb->s_writers.frozen == SB_UNFROZEN);
+		/* Wait for sb to unfreeze */
+		sb_start_write(sb);
+		sb_end_write(sb);
 		put_super(sb);
 		goto retry;
 	}
diff --git a/fs/super.c b/fs/super.c
index 1b8ea81788d4..603cc1672032 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -236,7 +236,6 @@  static struct super_block *alloc_super(struct file_system_type *type, int flags,
 					&type->s_writers_key[i]))
 			goto fail;
 	}
-	init_waitqueue_head(&s->s_writers.wait_unfrozen);
 	s->s_bdi = &noop_backing_dev_info;
 	s->s_flags = flags;
 	if (s->s_user_ns != &init_user_ns)
@@ -1761,7 +1760,6 @@  int freeze_super(struct super_block *sb, enum freeze_holder who)
 	if (ret) {
 		sb->s_writers.frozen = SB_UNFROZEN;
 		sb_freeze_unlock(sb, SB_FREEZE_PAGEFAULT);
-		wake_up(&sb->s_writers.wait_unfrozen);
 		wake_up_var(&sb->s_writers.frozen);
 		deactivate_locked_super(sb);
 		return ret;
@@ -1778,7 +1776,6 @@  int freeze_super(struct super_block *sb, enum freeze_holder who)
 				"VFS:Filesystem freeze failed\n");
 			sb->s_writers.frozen = SB_UNFROZEN;
 			sb_freeze_unlock(sb, SB_FREEZE_FS);
-			wake_up(&sb->s_writers.wait_unfrozen);
 			wake_up_var(&sb->s_writers.frozen);
 			deactivate_locked_super(sb);
 			return ret;
@@ -1853,7 +1850,6 @@  static int thaw_super_locked(struct super_block *sb, enum freeze_holder who)
 	wake_up_var(&sb->s_writers.frozen);
 	sb_freeze_unlock(sb, SB_FREEZE_FS);
 out:
-	wake_up(&sb->s_writers.wait_unfrozen);
 	deactivate_locked_super(sb);
 	return 0;
 }
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 88bd81a1b980..584cfaa47988 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1147,7 +1147,6 @@  enum {
 struct sb_writers {
 	unsigned short			frozen;		/* Is sb frozen? */
 	unsigned short			freeze_holders;	/* Who froze fs? */
-	wait_queue_head_t		wait_unfrozen;	/* wait for thaw */
 	struct percpu_rw_semaphore	rw_sem[SB_FREEZE_LEVELS];
 };