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orangefs: free superblock when mount fails 

Otherwise lockdep says:

[ 1337.483798] ================================================
[ 1337.483999] [ BUG: lock held when returning to user space! ]
[ 1337.484252] 4.11.0-rc6 #19 Not tainted
[ 1337.484423] ------------------------------------------------
[ 1337.484626] mount/14766 is leaving the kernel with locks still held!
[ 1337.484841] 1 lock held by mount/14766:
[ 1337.485017]  #0:  (&type->s_umount_key#33/1){+.+.+.}, at: [<ffffffff8124171f>] sget_userns+0x2af/0x520

Caught by xfstests generic/413 which tried to mount with the unsupported
mount option dax.  Then xfstests generic/422 ran sync which deadlocks.

Signed-off-by: Martin Brandenburg <martin@omnibond.com>
Acked-by: Mike Marshall <hubcap@omnibond.com>
Cc: stable@vger.kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Martin Brandenburg 2017-04-14 14:22:41 -04:00 committed by Linus Torvalds
parent c0eb027e5a
commit 1ec1688c53
3 changed files with 24 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
fs/orangefs/devorangefs-req.c
View File

@ -208,14 +208,19 @@ static ssize_t orangefs_devreq_read(struct file *file,
continue;
/*
* Skip ops whose filesystem we don't know about unless
* it is being mounted.
* it is being mounted or unmounted. It is possible for
* a filesystem we don't know about to be unmounted if
* it fails to mount in the kernel after userspace has
* been sent the mount request.
*/
/* XXX: is there a better way to detect this? */
} else if (ret == -1 &&
!(op->upcall.type ==
ORANGEFS_VFS_OP_FS_MOUNT ||
op->upcall.type ==
ORANGEFS_VFS_OP_GETATTR)) {
ORANGEFS_VFS_OP_GETATTR ||
op->upcall.type ==
ORANGEFS_VFS_OP_FS_UMOUNT)) {
gossip_debug(GOSSIP_DEV_DEBUG,
"orangefs: skipping op tag %llu %s\n",
llu(op->tag), get_opname_string(op));

1
fs/orangefs/orangefs-kernel.h
View File

@ -249,6 +249,7 @@ struct orangefs_sb_info_s {
char devname[ORANGEFS_MAX_SERVER_ADDR_LEN];
struct super_block *sb;
int mount_pending;
int no_list;
struct list_head list;
};

23
fs/orangefs/super.c
View File

@ -493,7 +493,7 @@ struct dentry *orangefs_mount(struct file_system_type *fst,
if (ret) {
d = ERR_PTR(ret);
goto free_op;
goto free_sb_and_op;
}
/*
@ -519,6 +519,9 @@ struct dentry *orangefs_mount(struct file_system_type *fst,
spin_unlock(&orangefs_superblocks_lock);
op_release(new_op);
/* Must be removed from the list now. */
ORANGEFS_SB(sb)->no_list = 0;
if (orangefs_userspace_version >= 20906) {
new_op = op_alloc(ORANGEFS_VFS_OP_FEATURES);
if (!new_op)
@ -533,6 +536,10 @@ struct dentry *orangefs_mount(struct file_system_type *fst,
return dget(sb->s_root);
free_sb_and_op:
/* Will call orangefs_kill_sb with sb not in list. */
ORANGEFS_SB(sb)->no_list = 1;
deactivate_locked_super(sb);
free_op:
gossip_err("orangefs_mount: mount request failed with %d\n", ret);
if (ret == -EINVAL) {
@ -558,12 +565,14 @@ void orangefs_kill_sb(struct super_block *sb)
*/
orangefs_unmount_sb(sb);
/* remove the sb from our list of orangefs specific sb's */
spin_lock(&orangefs_superblocks_lock);
__list_del_entry(&ORANGEFS_SB(sb)->list); /* not list_del_init */
ORANGEFS_SB(sb)->list.prev = NULL;
spin_unlock(&orangefs_superblocks_lock);
if (!ORANGEFS_SB(sb)->no_list) {
/* remove the sb from our list of orangefs specific sb's */
spin_lock(&orangefs_superblocks_lock);
/* not list_del_init */
__list_del_entry(&ORANGEFS_SB(sb)->list);
ORANGEFS_SB(sb)->list.prev = NULL;
spin_unlock(&orangefs_superblocks_lock);
}
/*
* make sure that ORANGEFS_DEV_REMOUNT_ALL loop that might've seen us