fs: take dcache_lock inside __d_path
All callers take dcache_lock just around the call to __d_path, so
take the lock into it in preparation of getting rid of dcache_lock.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/dcache.c b/fs/dcache.c
index 83293be..54f93f5 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -1994,7 +1994,7 @@
* Returns a pointer into the buffer or an error code if the
* path was too long.
*
- * "buflen" should be positive. Caller holds the dcache_lock.
+ * "buflen" should be positive.
*
* If path is not reachable from the supplied root, then the value of
* root is changed (without modifying refcounts).
@@ -2006,10 +2006,12 @@
int error;
prepend(&res, &buflen, "\0", 1);
+ spin_lock(&dcache_lock);
error = prepend_path(path, root, &res, &buflen);
+ spin_unlock(&dcache_lock);
+
if (error)
return ERR_PTR(error);
-
return res;
}
diff --git a/fs/seq_file.c b/fs/seq_file.c
index 0e7cb13..05d6b0e 100644
--- a/fs/seq_file.c
+++ b/fs/seq_file.c
@@ -462,9 +462,7 @@
if (size) {
char *p;
- spin_lock(&dcache_lock);
p = __d_path(path, root, buf, size);
- spin_unlock(&dcache_lock);
res = PTR_ERR(p);
if (!IS_ERR(p)) {
char *end = mangle_path(buf, p, esc);
diff --git a/security/apparmor/path.c b/security/apparmor/path.c
index 8239605..36cc0cc 100644
--- a/security/apparmor/path.c
+++ b/security/apparmor/path.c
@@ -72,10 +72,8 @@
path_get(&root);
}
- spin_lock(&dcache_lock);
tmp = root;
res = __d_path(path, &tmp, buf, buflen);
- spin_unlock(&dcache_lock);
*name = res;
/* handle error conditions - and still allow a partial path to
diff --git a/security/tomoyo/realpath.c b/security/tomoyo/realpath.c
index ed8ccd6..1d0bf8f 100644
--- a/security/tomoyo/realpath.c
+++ b/security/tomoyo/realpath.c
@@ -127,10 +127,8 @@
/* If we don't have a vfsmount, we can't calculate. */
if (!path->mnt)
break;
- spin_lock(&dcache_lock);
/* go to whatever namespace root we are under */
pos = __d_path(path, &ns_root, buf, buf_len);
- spin_unlock(&dcache_lock);
/* Prepend "/proc" prefix if using internal proc vfs mount. */
if (!IS_ERR(pos) && (path->mnt->mnt_flags & MNT_INTERNAL) &&
(path->mnt->mnt_sb->s_magic == PROC_SUPER_MAGIC)) {
