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authorAl Viro <viro@zeniv.linux.org.uk>2009-08-09 01:41:57 +0400
committerAl Viro <viro@zeniv.linux.org.uk>2009-12-16 12:16:43 -0500
commit6de88d72927dc85297b3075024487313c4ba3a2e (patch)
tree278609d97c5635bb3922634b274689739fbf09d6 /fs/namei.c
parent258fa99905f704afed1a43f195bc5235a56fb895 (diff)
kill __link_path_walk()/link_path_walk() distinction
put retry logics into path_walk() and do_filp_open() Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/namei.c')
-rw-r--r--fs/namei.c68
1 files changed, 34 insertions, 34 deletions
diff --git a/fs/namei.c b/fs/namei.c
index 30c61c298b4c..89e380583ab8 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -108,8 +108,6 @@
* any extra contention...
*/
-static int __link_path_walk(const char *name, struct nameidata *nd);
-
/* In order to reduce some races, while at the same time doing additional
* checking and hopefully speeding things up, we copy filenames to the
* kernel data space before using them..
@@ -529,35 +527,6 @@ out_unlock:
return result;
}
-/*
- * Wrapper to retry pathname resolution whenever the underlying
- * file system returns an ESTALE.
- *
- * Retry the whole path once, forcing real lookup requests
- * instead of relying on the dcache.
- */
-static __always_inline int link_path_walk(const char *name, struct nameidata *nd)
-{
- struct path save = nd->path;
- int result;
-
- /* make sure the stuff we saved doesn't go away */
- path_get(&save);
-
- result = __link_path_walk(name, nd);
- if (result == -ESTALE) {
- /* nd->path had been dropped */
- nd->path = save;
- path_get(&nd->path);
- nd->flags |= LOOKUP_REVAL;
- result = __link_path_walk(name, nd);
- }
-
- path_put(&save);
-
- return result;
-}
-
static __always_inline void set_root(struct nameidata *nd)
{
if (!nd->root.mnt) {
@@ -569,6 +538,8 @@ static __always_inline void set_root(struct nameidata *nd)
}
}
+static int link_path_walk(const char *, struct nameidata *);
+
static __always_inline int __vfs_follow_link(struct nameidata *nd, const char *link)
{
int res = 0;
@@ -834,7 +805,7 @@ fail:
* Returns 0 and nd will have valid dentry and mnt on success.
* Returns error and drops reference to input namei data on failure.
*/
-static int __link_path_walk(const char *name, struct nameidata *nd)
+static int link_path_walk(const char *name, struct nameidata *nd)
{
struct path next;
struct inode *inode;
@@ -1016,8 +987,27 @@ return_err:
static int path_walk(const char *name, struct nameidata *nd)
{
+ struct path save = nd->path;
+ int result;
+
current->total_link_count = 0;
- return link_path_walk(name, nd);
+
+ /* make sure the stuff we saved doesn't go away */
+ path_get(&save);
+
+ result = link_path_walk(name, nd);
+ if (result == -ESTALE) {
+ /* nd->path had been dropped */
+ current->total_link_count = 0;
+ nd->path = save;
+ path_get(&nd->path);
+ nd->flags |= LOOKUP_REVAL;
+ result = link_path_walk(name, nd);
+ }
+
+ path_put(&save);
+
+ return result;
}
static int path_init(int dfd, const char *name, unsigned int flags, struct nameidata *nd)
@@ -1649,7 +1639,7 @@ struct file *do_filp_open(int dfd, const char *pathname,
struct file *filp;
struct nameidata nd;
int error;
- struct path path;
+ struct path path, save;
struct dentry *dir;
int count = 0;
int will_write;
@@ -1862,7 +1852,17 @@ do_link:
error = security_inode_follow_link(path.dentry, &nd);
if (error)
goto exit_dput;
+ save = nd.path;
+ path_get(&save);
error = __do_follow_link(&path, &nd);
+ if (error == -ESTALE) {
+ /* nd.path had been dropped */
+ nd.path = save;
+ path_get(&nd.path);
+ nd.flags |= LOOKUP_REVAL;
+ error = __do_follow_link(&path, &nd);
+ }
+ path_put(&save);
path_put(&path);
if (error) {
/* Does someone understand code flow here? Or it is only