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Merge branch 'autofs' (patches from Ian Kent) 

Merge emailed autofs cleanup/fix patches from Ian Kent

* autofs:
  autofs4 - use simple_empty() for empty directory check
  autofs4 - dont clear DCACHE_NEED_AUTOMOUNT on rootless mount
This commit is contained in:
Linus Torvalds 2012-12-13 19:13:37 -08:00
parent e05a1c6397 0259cb02c4
commit 15de059927
2 changed files with 42 additions and 52 deletions
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9
fs/autofs4/expire.c
View File

@ -548,15 +548,6 @@ int autofs4_do_expire_multi(struct super_block *sb, struct vfsmount *mnt,
spin_lock(&sbi->fs_lock);
ino->flags &= ~AUTOFS_INF_EXPIRING;
spin_lock(&dentry->d_lock);
if (!ret) {
if ((IS_ROOT(dentry) ||
(autofs_type_indirect(sbi->type) &&
IS_ROOT(dentry->d_parent))) &&
!(dentry->d_flags & DCACHE_NEED_AUTOMOUNT))
__managed_dentry_set_automount(dentry);
}
spin_unlock(&dentry->d_lock);
complete_all(&ino->expire_complete);
spin_unlock(&sbi->fs_lock);
dput(dentry);

85
fs/autofs4/root.c
View File

@ -124,13 +124,10 @@ static int autofs4_dir_open(struct inode *inode, struct file *file)
* it.
*/
spin_lock(&sbi->lookup_lock);
spin_lock(&dentry->d_lock);
if (!d_mountpoint(dentry) && list_empty(&dentry->d_subdirs)) {
spin_unlock(&dentry->d_lock);
if (!d_mountpoint(dentry) && simple_empty(dentry)) {
spin_unlock(&sbi->lookup_lock);
return -ENOENT;
}
spin_unlock(&dentry->d_lock);
spin_unlock(&sbi->lookup_lock);
out:
@ -355,7 +352,6 @@ static struct vfsmount *autofs4_d_automount(struct path *path)
status = autofs4_mount_wait(dentry);
if (status)
return ERR_PTR(status);
spin_lock(&sbi->fs_lock);
goto done;
}
@ -364,8 +360,11 @@ static struct vfsmount *autofs4_d_automount(struct path *path)
* having d_mountpoint() true, so there's no need to call back
* to the daemon.
*/
if (dentry->d_inode && S_ISLNK(dentry->d_inode->i_mode))
if (dentry->d_inode && S_ISLNK(dentry->d_inode->i_mode)) {
spin_unlock(&sbi->fs_lock);
goto done;
}
if (!d_mountpoint(dentry)) {
/*
* It's possible that user space hasn't removed directories
@ -379,15 +378,13 @@ static struct vfsmount *autofs4_d_automount(struct path *path)
* require user space behave.
*/
if (sbi->version > 4) {
if (have_submounts(dentry))
goto done;
} else {
spin_lock(&dentry->d_lock);
if (!list_empty(&dentry->d_subdirs)) {
spin_unlock(&dentry->d_lock);
if (have_submounts(dentry)) {
spin_unlock(&sbi->fs_lock);
goto done;
}
spin_unlock(&dentry->d_lock);
} else {
if (!simple_empty(dentry))
goto done;
}
ino->flags |= AUTOFS_INF_PENDING;
spin_unlock(&sbi->fs_lock);
@ -399,28 +396,8 @@ static struct vfsmount *autofs4_d_automount(struct path *path)
return ERR_PTR(status);
}
}
done:
if (!(ino->flags & AUTOFS_INF_EXPIRING)) {
/*
* Any needed mounting has been completed and the path
* updated so clear DCACHE_NEED_AUTOMOUNT so we don't
* call ->d_automount() on rootless multi-mounts since
* it can lead to an incorrect ELOOP error return.
*
* Only clear DMANAGED_AUTOMOUNT for rootless multi-mounts and
* symlinks as in all other cases the dentry will be covered by
* an actual mount so ->d_automount() won't be called during
* the follow.
*/
spin_lock(&dentry->d_lock);
if ((!d_mountpoint(dentry) &&
!list_empty(&dentry->d_subdirs)) ||
(dentry->d_inode && S_ISLNK(dentry->d_inode->i_mode)))
__managed_dentry_clear_automount(dentry);
spin_unlock(&dentry->d_lock);
}
spin_unlock(&sbi->fs_lock);
done:
/* Mount succeeded, check if we ended up with a new dentry */
dentry = autofs4_mountpoint_changed(path);
if (!dentry)
@ -432,6 +409,8 @@ done:
int autofs4_d_manage(struct dentry *dentry, bool rcu_walk)
{
struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
struct autofs_info *ino = autofs4_dentry_ino(dentry);
int status;
DPRINTK("dentry=%p %.*s",
dentry, dentry->d_name.len, dentry->d_name.name);
@ -456,7 +435,32 @@ int autofs4_d_manage(struct dentry *dentry, bool rcu_walk)
* This dentry may be under construction so wait on mount
* completion.
*/
return autofs4_mount_wait(dentry);
status = autofs4_mount_wait(dentry);
if (status)
return status;
spin_lock(&sbi->fs_lock);
/*
* If the dentry has been selected for expire while we slept
* on the lock then it might go away. We'll deal with that in
* ->d_automount() and wait on a new mount if the expire
* succeeds or return here if it doesn't (since there's no
* mount to follow with a rootless multi-mount).
*/
if (!(ino->flags & AUTOFS_INF_EXPIRING)) {
/*
* Any needed mounting has been completed and the path
* updated so check if this is a rootless multi-mount so
* we can avoid needless calls ->d_automount() and avoid
* an incorrect ELOOP error return.
*/
if ((!d_mountpoint(dentry) && !simple_empty(dentry)) ||
(dentry->d_inode && S_ISLNK(dentry->d_inode->i_mode)))
status = -EISDIR;
}
spin_unlock(&sbi->fs_lock);
return status;
}
/* Lookups in the root directory */
@ -599,9 +603,7 @@ static int autofs4_dir_unlink(struct inode *dir, struct dentry *dentry)
spin_lock(&sbi->lookup_lock);
__autofs4_add_expiring(dentry);
spin_lock(&dentry->d_lock);
__d_drop(dentry);
spin_unlock(&dentry->d_lock);
d_drop(dentry);
spin_unlock(&sbi->lookup_lock);
return 0;
@ -672,15 +674,12 @@ static int autofs4_dir_rmdir(struct inode *dir, struct dentry *dentry)
return -EACCES;
spin_lock(&sbi->lookup_lock);
spin_lock(&dentry->d_lock);
if (!list_empty(&dentry->d_subdirs)) {
spin_unlock(&dentry->d_lock);
if (!simple_empty(dentry)) {
spin_unlock(&sbi->lookup_lock);
return -ENOTEMPTY;
}
__autofs4_add_expiring(dentry);
__d_drop(dentry);
spin_unlock(&dentry->d_lock);
d_drop(dentry);
spin_unlock(&sbi->lookup_lock);
if (sbi->version < 5)