| Message ID | 168653973399.755178.13985159536040832418.stgit@frogsfrogsfrogs (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | fs: kernel and userspace filesystem freeze | expand |
On Sun 11-06-23 20:15:34, 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> I have this already queued in my tree for the merge window... :) Honza > --- > fs/quota/quota.c | 5 +++-- > fs/super.c | 4 ---- > include/linux/fs.h | 1 - > 3 files changed, 3 insertions(+), 7 deletions(-) > > > 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 151e0eeff2c2..fd04dda6c5c0 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) > @@ -1753,7 +1752,6 @@ 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; > @@ -1770,7 +1768,6 @@ 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 c58a560569b3..5870fbbecb81 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]; > }; > >
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 151e0eeff2c2..fd04dda6c5c0 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) @@ -1753,7 +1752,6 @@ 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; @@ -1770,7 +1768,6 @@ 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 c58a560569b3..5870fbbecb81 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]; };