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-rw-r--r--fs/dquot.c18
-rw-r--r--fs/namespace.c64
-rw-r--r--fs/super.c1
3 files changed, 44 insertions, 39 deletions
diff --git a/fs/dquot.c b/fs/dquot.c
index afa06a89346..05b60283c9c 100644
--- a/fs/dquot.c
+++ b/fs/dquot.c
@@ -1321,13 +1321,11 @@ int vfs_quota_off(struct super_block *sb, int type)
int cnt;
struct quota_info *dqopt = sb_dqopt(sb);
struct inode *toputinode[MAXQUOTAS];
- struct vfsmount *toputmnt[MAXQUOTAS];
/* We need to serialize quota_off() for device */
down(&dqopt->dqonoff_sem);
for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
toputinode[cnt] = NULL;
- toputmnt[cnt] = NULL;
if (type != -1 && cnt != type)
continue;
if (!sb_has_quota_enabled(sb, cnt))
@@ -1348,9 +1346,7 @@ int vfs_quota_off(struct super_block *sb, int type)
put_quota_format(dqopt->info[cnt].dqi_format);
toputinode[cnt] = dqopt->files[cnt];
- toputmnt[cnt] = dqopt->mnt[cnt];
dqopt->files[cnt] = NULL;
- dqopt->mnt[cnt] = NULL;
dqopt->info[cnt].dqi_flags = 0;
dqopt->info[cnt].dqi_igrace = 0;
dqopt->info[cnt].dqi_bgrace = 0;
@@ -1358,10 +1354,7 @@ int vfs_quota_off(struct super_block *sb, int type)
}
up(&dqopt->dqonoff_sem);
/* Sync the superblock so that buffers with quota data are written to
- * disk (and so userspace sees correct data afterwards).
- * The reference to vfsmnt we are still holding protects us from
- * umount (we don't have it only when quotas are turned on/off for
- * journal replay but in that case we are guarded by the fs anyway). */
+ * disk (and so userspace sees correct data afterwards). */
if (sb->s_op->sync_fs)
sb->s_op->sync_fs(sb, 1);
sync_blockdev(sb->s_bdev);
@@ -1385,10 +1378,6 @@ int vfs_quota_off(struct super_block *sb, int type)
iput(toputinode[cnt]);
}
up(&dqopt->dqonoff_sem);
- /* We don't hold the reference when we turned on quotas
- * just for the journal replay... */
- if (toputmnt[cnt])
- mntput(toputmnt[cnt]);
}
if (sb->s_bdev)
invalidate_bdev(sb->s_bdev, 0);
@@ -1503,11 +1492,8 @@ int vfs_quota_on(struct super_block *sb, int type, int format_id, char *path)
/* Quota file not on the same filesystem? */
if (nd.mnt->mnt_sb != sb)
error = -EXDEV;
- else {
+ else
error = vfs_quota_on_inode(nd.dentry->d_inode, type, format_id);
- if (!error)
- sb_dqopt(sb)->mnt[type] = mntget(nd.mnt);
- }
out_path:
path_release(&nd);
return error;
diff --git a/fs/namespace.c b/fs/namespace.c
index 2fa9fdf7d6f..1d83302f30c 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -172,7 +172,7 @@ clone_mnt(struct vfsmount *old, struct dentry *root)
return mnt;
}
-void __mntput(struct vfsmount *mnt)
+static inline void __mntput(struct vfsmount *mnt)
{
struct super_block *sb = mnt->mnt_sb;
dput(mnt->mnt_root);
@@ -180,7 +180,46 @@ void __mntput(struct vfsmount *mnt)
deactivate_super(sb);
}
-EXPORT_SYMBOL(__mntput);
+void mntput_no_expire(struct vfsmount *mnt)
+{
+repeat:
+ if (atomic_dec_and_lock(&mnt->mnt_count, &vfsmount_lock)) {
+ if (likely(!mnt->mnt_pinned)) {
+ spin_unlock(&vfsmount_lock);
+ __mntput(mnt);
+ return;
+ }
+ atomic_add(mnt->mnt_pinned + 1, &mnt->mnt_count);
+ mnt->mnt_pinned = 0;
+ spin_unlock(&vfsmount_lock);
+ acct_auto_close_mnt(mnt);
+ security_sb_umount_close(mnt);
+ goto repeat;
+ }
+}
+
+EXPORT_SYMBOL(mntput_no_expire);
+
+void mnt_pin(struct vfsmount *mnt)
+{
+ spin_lock(&vfsmount_lock);
+ mnt->mnt_pinned++;
+ spin_unlock(&vfsmount_lock);
+}
+
+EXPORT_SYMBOL(mnt_pin);
+
+void mnt_unpin(struct vfsmount *mnt)
+{
+ spin_lock(&vfsmount_lock);
+ if (mnt->mnt_pinned) {
+ atomic_inc(&mnt->mnt_count);
+ mnt->mnt_pinned--;
+ }
+ spin_unlock(&vfsmount_lock);
+}
+
+EXPORT_SYMBOL(mnt_unpin);
/* iterator */
static void *m_start(struct seq_file *m, loff_t *pos)
@@ -435,16 +474,6 @@ static int do_umount(struct vfsmount *mnt, int flags)
down_write(&current->namespace->sem);
spin_lock(&vfsmount_lock);
- if (atomic_read(&sb->s_active) == 1) {
- /* last instance - try to be smart */
- spin_unlock(&vfsmount_lock);
- lock_kernel();
- DQUOT_OFF(sb);
- acct_auto_close(sb);
- unlock_kernel();
- security_sb_umount_close(mnt);
- spin_lock(&vfsmount_lock);
- }
retval = -EBUSY;
if (atomic_read(&mnt->mnt_count) == 2 || flags & MNT_DETACH) {
if (!list_empty(&mnt->mnt_list))
@@ -850,17 +879,6 @@ static void expire_mount(struct vfsmount *mnt, struct list_head *mounts)
detach_mnt(mnt, &old_nd);
spin_unlock(&vfsmount_lock);
path_release(&old_nd);
-
- /*
- * Now lay it to rest if this was the last ref on the superblock
- */
- if (atomic_read(&mnt->mnt_sb->s_active) == 1) {
- /* last instance - try to be smart */
- lock_kernel();
- DQUOT_OFF(mnt->mnt_sb);
- acct_auto_close(mnt->mnt_sb);
- unlock_kernel();
- }
mntput(mnt);
} else {
/*
diff --git a/fs/super.c b/fs/super.c
index eed6c313290..6689dded3c8 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -171,6 +171,7 @@ void deactivate_super(struct super_block *s)
if (atomic_dec_and_lock(&s->s_active, &sb_lock)) {
s->s_count -= S_BIAS-1;
spin_unlock(&sb_lock);
+ DQUOT_OFF(s);
down_write(&s->s_umount);
fs->kill_sb(s);
put_filesystem(fs);