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| author | Al Viro <viro@zeniv.linux.org.uk> | 2015-01-11 10:57:27 -0500 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2015-01-25 23:17:28 -0500 |
| commit | fdab684d7202774bfd8762d4a656a553b787c8ec (patch) | |
| tree | 8ddb298648037f9abd37bc3b263e53695ceb9ce2 | |
| parent | 3b994d98a815d934ab6a77a380882865982c14f9 (diff) | |
| download | linux-stable-fdab684d7202774bfd8762d4a656a553b787c8ec.tar.gz linux-stable-fdab684d7202774bfd8762d4a656a553b787c8ec.tar.bz2 linux-stable-fdab684d7202774bfd8762d4a656a553b787c8ec.zip | |
allow attaching fs_pin to a group not associated with some superblock
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| -rw-r--r-- | fs/fs_pin.c | 20 | ||||
| -rw-r--r-- | fs/internal.h | 2 | ||||
| -rw-r--r-- | fs/super.c | 4 | ||||
| -rw-r--r-- | include/linux/fs_pin.h | 1 |
4 files changed, 17 insertions, 10 deletions
diff --git a/fs/fs_pin.c b/fs/fs_pin.c index 5eb39a93a560..50ef7d2ef03c 100644 --- a/fs/fs_pin.c +++ b/fs/fs_pin.c @@ -14,14 +14,20 @@ void pin_remove(struct fs_pin *pin) spin_unlock(&pin_lock); } -void pin_insert(struct fs_pin *pin, struct vfsmount *m) +void pin_insert_group(struct fs_pin *pin, struct vfsmount *m, struct hlist_head *p) { spin_lock(&pin_lock); - hlist_add_head(&pin->s_list, &m->mnt_sb->s_pins); + if (p) + hlist_add_head(&pin->s_list, p); hlist_add_head(&pin->m_list, &real_mount(m)->mnt_pins); spin_unlock(&pin_lock); } +void pin_insert(struct fs_pin *pin, struct vfsmount *m) +{ + pin_insert_group(pin, m, &m->mnt_sb->s_pins); +} + void mnt_pin_kill(struct mount *m) { while (1) { @@ -38,18 +44,18 @@ void mnt_pin_kill(struct mount *m) } } -void sb_pin_kill(struct super_block *sb) +void group_pin_kill(struct hlist_head *p) { while (1) { - struct hlist_node *p; + struct hlist_node *q; struct fs_pin *pin; rcu_read_lock(); - p = ACCESS_ONCE(sb->s_pins.first); - if (!p) { + q = ACCESS_ONCE(p->first); + if (!q) { rcu_read_unlock(); break; } - pin = hlist_entry(p, struct fs_pin, s_list); + pin = hlist_entry(q, struct fs_pin, s_list); pin->kill(pin); } } diff --git a/fs/internal.h b/fs/internal.h index e9a61fe67575..a6efd2f09ba3 100644 --- a/fs/internal.h +++ b/fs/internal.h @@ -145,7 +145,7 @@ extern const struct file_operations pipefifo_fops; /* * fs_pin.c */ -extern void sb_pin_kill(struct super_block *sb); +extern void group_pin_kill(struct hlist_head *p); extern void mnt_pin_kill(struct mount *m); /* diff --git a/fs/super.c b/fs/super.c index eae088f6aaae..2d822459bc3d 100644 --- a/fs/super.c +++ b/fs/super.c @@ -706,9 +706,9 @@ int do_remount_sb(struct super_block *sb, int flags, void *data, int force) remount_ro = (flags & MS_RDONLY) && !(sb->s_flags & MS_RDONLY); if (remount_ro) { - if (sb->s_pins.first) { + if (!hlist_empty(&sb->s_pins)) { up_write(&sb->s_umount); - sb_pin_kill(sb); + group_pin_kill(&sb->s_pins); down_write(&sb->s_umount); if (!sb->s_root) return 0; diff --git a/include/linux/fs_pin.h b/include/linux/fs_pin.h index a2e71912e758..2be38d1464ae 100644 --- a/include/linux/fs_pin.h +++ b/include/linux/fs_pin.h @@ -7,4 +7,5 @@ struct fs_pin { }; void pin_remove(struct fs_pin *); +void pin_insert_group(struct fs_pin *, struct vfsmount *, struct hlist_head *); void pin_insert(struct fs_pin *, struct vfsmount *); |