diff options
Diffstat (limited to 'fs/namei.c')
| -rw-r--r-- | fs/namei.c | 68 |
1 files changed, 34 insertions, 34 deletions
diff --git a/fs/namei.c b/fs/namei.c index 30c61c298b4..89e380583ab 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 |