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authorLinus Torvalds <torvalds@linux-foundation.org>2020-12-25 10:54:29 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2020-12-25 10:54:29 -0800
commit7bb5226c8a4bbf26a9ededc90532b0ad539d2017 (patch)
tree73ddf0d8db109a3b14710269630366fa68290317 /fs/namespace.c
parent71c5f03154ac1cb27423b984743ccc2f5d11d14d (diff)
parent2e2cbaf920d14de9a96180ddefd6861bcc46f07d (diff)
Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
Pull misc vfs updates from Al Viro: "Assorted patches from previous cycle(s)..." * 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: fix hostfs_open() use of ->f_path.dentry Make sure that make_create_in_sticky() never sees uninitialized value of dir_mode fs: Kill DCACHE_DONTCACHE dentry even if DCACHE_REFERENCED is set fs: Handle I_DONTCACHE in iput_final() instead of generic_drop_inode() fs/namespace.c: WARN if mnt_count has become negative
Diffstat (limited to 'fs/namespace.c')
-rw-r--r--fs/namespace.c9
1 files changed, 6 insertions, 3 deletions
diff --git a/fs/namespace.c b/fs/namespace.c
index 2b681f65ca04..d2db7dfe232b 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -156,10 +156,10 @@ static inline void mnt_add_count(struct mount *mnt, int n)
/*
* vfsmount lock must be held for write
*/
-unsigned int mnt_get_count(struct mount *mnt)
+int mnt_get_count(struct mount *mnt)
{
#ifdef CONFIG_SMP
- unsigned int count = 0;
+ int count = 0;
int cpu;
for_each_possible_cpu(cpu) {
@@ -1139,6 +1139,7 @@ static DECLARE_DELAYED_WORK(delayed_mntput_work, delayed_mntput);
static void mntput_no_expire(struct mount *mnt)
{
LIST_HEAD(list);
+ int count;
rcu_read_lock();
if (likely(READ_ONCE(mnt->mnt_ns))) {
@@ -1162,7 +1163,9 @@ static void mntput_no_expire(struct mount *mnt)
*/
smp_mb();
mnt_add_count(mnt, -1);
- if (mnt_get_count(mnt)) {
+ count = mnt_get_count(mnt);
+ if (count != 0) {
+ WARN_ON(count < 0);
rcu_read_unlock();
unlock_mount_hash();
return;