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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

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Pull filesystem fixes from Al Viro:
 "Several bugfixes (all of them -stable fodder).

  Alexey's one deals with double mutex_lock() in UFS (apparently, nobody
  has tried to test "ufs: sb mutex merge + mutex_destroy" on something
  like file creation/removal on ufs).  Mine deal with two kinds of
  umount bugs, in umount propagation and in handling of automounted
  submounts, both resulting in bogus transient EBUSY from umount"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  ufs: fix deadlocks introduced by sb mutex merge
  fix EBUSY on umount() from MNT_SHRINKABLE
  get rid of propagate_umount() mistakenly treating slaves as busy.
This commit is contained in:
Linus Torvalds 2014-09-07 10:59:58 -07:00
commit 9142eadefe
4 changed files with 18 additions and 14 deletions
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10
fs/namespace.c
View File

@ -1217,6 +1217,11 @@ static void namespace_unlock(void)
head.first->pprev = &head.first;
INIT_HLIST_HEAD(&unmounted);
/* undo decrements we'd done in umount_tree() */
hlist_for_each_entry(mnt, &head, mnt_hash)
if (mnt->mnt_ex_mountpoint.mnt)
mntget(mnt->mnt_ex_mountpoint.mnt);
up_write(&namespace_sem);
synchronize_rcu();
@ -1253,6 +1258,9 @@ void umount_tree(struct mount *mnt, int how)
hlist_add_head(&p->mnt_hash, &tmp_list);
}
hlist_for_each_entry(p, &tmp_list, mnt_hash)
list_del_init(&p->mnt_child);
if (how)
propagate_umount(&tmp_list);
@ -1263,9 +1271,9 @@ void umount_tree(struct mount *mnt, int how)
p->mnt_ns = NULL;
if (how < 2)
p->mnt.mnt_flags |= MNT_SYNC_UMOUNT;
list_del_init(&p->mnt_child);
if (mnt_has_parent(p)) {
put_mountpoint(p->mnt_mp);
mnt_add_count(p->mnt_parent, -1);
/* move the reference to mountpoint into ->mnt_ex_mountpoint */
p->mnt_ex_mountpoint.dentry = p->mnt_mountpoint;
p->mnt_ex_mountpoint.mnt = &p->mnt_parent->mnt;

1
fs/pnode.c
View File

@ -381,6 +381,7 @@ static void __propagate_umount(struct mount *mnt)
* other children
*/
if (child && list_empty(&child->mnt_mounts)) {
list_del_init(&child->mnt_child);
hlist_del_init_rcu(&child->mnt_hash);
hlist_add_before_rcu(&child->mnt_hash, &mnt->mnt_hash);
}

7
fs/ufs/inode.c
View File

@ -902,9 +902,6 @@ void ufs_evict_inode(struct inode * inode)
invalidate_inode_buffers(inode);
clear_inode(inode);
if (want_delete) {
lock_ufs(inode->i_sb);
ufs_free_inode (inode);
unlock_ufs(inode->i_sb);
}
if (want_delete)
ufs_free_inode(inode);
}

14
fs/ufs/namei.c
View File

@ -126,12 +126,12 @@ static int ufs_symlink (struct inode * dir, struct dentry * dentry,
if (l > sb->s_blocksize)
goto out_notlocked;
lock_ufs(dir->i_sb);
inode = ufs_new_inode(dir, S_IFLNK | S_IRWXUGO);
err = PTR_ERR(inode);
if (IS_ERR(inode))
goto out;
goto out_notlocked;
lock_ufs(dir->i_sb);
if (l > UFS_SB(sb)->s_uspi->s_maxsymlinklen) {
/* slow symlink */
inode->i_op = &ufs_symlink_inode_operations;
@ -181,13 +181,9 @@ static int ufs_mkdir(struct inode * dir, struct dentry * dentry, umode_t mode)
struct inode * inode;
int err;
lock_ufs(dir->i_sb);
inode_inc_link_count(dir);
inode = ufs_new_inode(dir, S_IFDIR|mode);
err = PTR_ERR(inode);
if (IS_ERR(inode))
goto out_dir;
return PTR_ERR(inode);
inode->i_op = &ufs_dir_inode_operations;
inode->i_fop = &ufs_dir_operations;
@ -195,6 +191,9 @@ static int ufs_mkdir(struct inode * dir, struct dentry * dentry, umode_t mode)
inode_inc_link_count(inode);
lock_ufs(dir->i_sb);
inode_inc_link_count(dir);
err = ufs_make_empty(inode, dir);
if (err)
goto out_fail;
@ -212,7 +211,6 @@ out_fail:
inode_dec_link_count(inode);
inode_dec_link_count(inode);
iput (inode);
out_dir:
inode_dec_link_count(dir);
unlock_ufs(dir->i_sb);
goto out;