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kill __link_path_walk()/link_path_walk() distinction

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put retry logics into path_walk() and do_filp_open()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2009-08-09 01:41:57 +04:00
parent 258fa99905
commit 6de88d7292
1 changed files with 34 additions and 34 deletions
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68
fs/namei.c
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@ -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