From be148247cfbe2422f5709e77d9c3e10b8a6394da Mon Sep 17 00:00:00 2001
From: Christoph Hellwig <hch@infradead.org>
Date: Sun, 10 Oct 2010 05:36:21 -0400
Subject: [PATCH] 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>
---
fs/dcache.c | 6 ++++--
fs/seq_file.c | 2 --
security/apparmor/path.c | 2 --
security/tomoyo/realpath.c | 2 --
4 files changed, 4 insertions(+), 8 deletions(-)
diff --git a/fs/dcache.c b/fs/dcache.c
index 83293be48149..54f93f5e6b0f 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -1994,7 +1994,7 @@ global_root:
* 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 @@ char *__d_path(const struct path *path, struct path *root,
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 0e7cb1395a94..05d6b0e78c95 100644
--- a/fs/seq_file.c
+++ b/fs/seq_file.c
@@ -462,9 +462,7 @@ int seq_path_root(struct seq_file *m, struct path *path, struct path *root,
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 82396050f186..36cc0cc39e78 100644
--- a/security/apparmor/path.c
+++ b/security/apparmor/path.c
@@ -72,10 +72,8 @@ static int d_namespace_path(struct path *path, char *buf, int buflen,
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 ed8ccd680102..1d0bf8fa1922 100644
--- a/security/tomoyo/realpath.c
+++ b/security/tomoyo/realpath.c
@@ -127,10 +127,8 @@ char *tomoyo_realpath_from_path(struct path *path)
/* 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)) {
--
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