Needed there since the callback passed to d_walk() (path_check_mount())
is using __path_is_mountpoint(), which uses __lookup_mnt().
Has to be taken in the caller - d_walk() might take rename_lock spinlock
component and that nests inside mount_lock.
Signed-off-by: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
---
fs/dcache.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/fs/dcache.c b/fs/dcache.c
index 60046ae23d51..ab21a8402db0 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -1390,6 +1390,7 @@ struct check_mount {
unsigned int mounted;
};
+/* locks: mount_locked_reader && dentry->d_lock */
static enum d_walk_ret path_check_mount(void *data, struct dentry *dentry)
{
struct check_mount *info = data;
@@ -1416,9 +1417,8 @@ int path_has_submounts(const struct path *parent)
{
struct check_mount data = { .mnt = parent->mnt, .mounted = 0 };
- read_seqlock_excl(&mount_lock);
+ guard(mount_locked_reader)();
d_walk(parent->dentry, &data, path_check_mount);
- read_sequnlock_excl(&mount_lock);
return data.mounted;
}
--
2.47.2
