1 files changed, 42 insertions, 24 deletions

diff --git a/fs/namei.c b/fs/namei.c
index 4acdac043b6b..8dc2b038d5d9 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -790,7 +790,7 @@ static fastcall int __link_path_walk(const char * name, struct nameidata *nd)
 
         inode = nd->dentry->d_inode;
         if (nd->depth)
-                lookup_flags = LOOKUP_FOLLOW;
+                lookup_flags = LOOKUP_FOLLOW | (nd->flags & LOOKUP_CONTINUE);
 
         /* At this point we know we have a real path component. */
         for(;;) {
@@ -885,7 +885,8 @@ static fastcall int __link_path_walk(const char * name, struct nameidata *nd)
 last_with_slashes:
                 lookup_flags |= LOOKUP_FOLLOW | LOOKUP_DIRECTORY;
 last_component:
-                nd->flags &= ~LOOKUP_CONTINUE;
+                /* Clear LOOKUP_CONTINUE iff it was previously unset */
+                nd->flags &= lookup_flags | ~LOOKUP_CONTINUE;
                 if (lookup_flags & LOOKUP_PARENT)
                         goto lookup_parent;
                 if (this.name[0] == '.') switch (this.len) {
@@ -1069,6 +1070,8 @@ static int fastcall do_path_lookup(int dfd, const char *name,
                                 unsigned int flags, struct nameidata *nd)
 {
         int retval = 0;
+        int fput_needed;
+        struct file *file;
 
         nd->last_type = LAST_ROOT; /* if there are only slashes... */
         nd->flags = flags;
@@ -1090,29 +1093,22 @@ static int fastcall do_path_lookup(int dfd, const char *name,
                 nd->mnt = mntget(current->fs->pwdmnt);
                 nd->dentry = dget(current->fs->pwd);
         } else {
-                struct file *file;
-                int fput_needed;
                 struct dentry *dentry;
 
                 file = fget_light(dfd, &fput_needed);
-                if (!file) {
-                        retval = -EBADF;
-                        goto out_fail;
-                }
+                retval = -EBADF;
+                if (!file)
+                        goto unlock_fail;
 
                 dentry = file->f_dentry;
 
-                if (!S_ISDIR(dentry->d_inode->i_mode)) {
-                        retval = -ENOTDIR;
-                        fput_light(file, fput_needed);
-                        goto out_fail;
-                }
+                retval = -ENOTDIR;
+                if (!S_ISDIR(dentry->d_inode->i_mode))
+                        goto fput_unlock_fail;
 
                 retval = file_permission(file, MAY_EXEC);
-                if (retval) {
-                        fput_light(file, fput_needed);
-                        goto out_fail;
-                }
+                if (retval)
+                        goto fput_unlock_fail;
 
                 nd->mnt = mntget(file->f_vfsmnt);
                 nd->dentry = dget(dentry);
@@ -1123,10 +1119,17 @@ static int fastcall do_path_lookup(int dfd, const char *name,
         current->total_link_count = 0;
         retval = link_path_walk(name, nd);
 out:
-        if (unlikely(current->audit_context
-                     && nd && nd->dentry && nd->dentry->d_inode))
+        if (likely(retval == 0)) {
+                if (unlikely(current->audit_context && nd && nd->dentry &&
+                                nd->dentry->d_inode))
                 audit_inode(name, nd->dentry->d_inode, flags);
-out_fail:
+        }
+        return retval;
+
+fput_unlock_fail:
+        fput_light(file, fput_needed);
+unlock_fail:
+        read_unlock(&current->fs->lock);
         return retval;
 }
 
@@ -1161,6 +1164,7 @@ static int __path_lookup_intent_open(int dfd, const char *name,
 
 /**
  * path_lookup_open - lookup a file path with open intent
+ * @dfd: the directory to use as base, or AT_FDCWD
  * @name: pointer to file name
  * @lookup_flags: lookup intent flags
  * @nd: pointer to nameidata
@@ -1175,6 +1179,7 @@ int path_lookup_open(int dfd, const char *name, unsigned int lookup_flags,
 
 /**
  * path_lookup_create - lookup a file path with open + create intent
+ * @dfd: the directory to use as base, or AT_FDCWD
  * @name: pointer to file name
  * @lookup_flags: lookup intent flags
  * @nd: pointer to nameidata
@@ -2219,13 +2224,17 @@ int vfs_link(struct dentry *old_dentry, struct inode *dir, struct dentry *new_de
  * and other special files.  --ADM
  */
 asmlinkage long sys_linkat(int olddfd, const char __user *oldname,
-                           int newdfd, const char __user *newname)
+                           int newdfd, const char __user *newname,
+                           int flags)
 {
         struct dentry *new_dentry;
         struct nameidata nd, old_nd;
         int error;
         char * to;
 
+        if (flags != 0)
+                return -EINVAL;
+
         to = getname(newname);
         if (IS_ERR(to))
                 return PTR_ERR(to);
@@ -2258,7 +2267,7 @@ exit:
 
 asmlinkage long sys_link(const char __user *oldname, const char __user *newname)
 {
-        return sys_linkat(AT_FDCWD, oldname, AT_FDCWD, newname);
+        return sys_linkat(AT_FDCWD, oldname, AT_FDCWD, newname, 0);
 }
 
 /*
@@ -2604,13 +2613,15 @@ void page_put_link(struct dentry *dentry, struct nameidata *nd, void *cookie)
         }
 }
 
-int page_symlink(struct inode *inode, const char *symname, int len)
+int __page_symlink(struct inode *inode, const char *symname, int len,
+                gfp_t gfp_mask)
 {
         struct address_space *mapping = inode->i_mapping;
-        struct page *page = grab_cache_page(mapping, 0);
+        struct page *page;
         int err = -ENOMEM;
         char *kaddr;
 
+        page = find_or_create_page(mapping, 0, gfp_mask);
         if (!page)
                 goto fail;
         err = mapping->a_ops->prepare_write(NULL, page, 0, len-1);
@@ -2645,6 +2656,12 @@ fail:
         return err;
 }
 
+int page_symlink(struct inode *inode, const char *symname, int len)
+{
+        return __page_symlink(inode, symname, len,
+                        mapping_gfp_mask(inode->i_mapping));
+}
+
 struct inode_operations page_symlink_inode_operations = {
         .readlink       = generic_readlink,
         .follow_link    = page_follow_link_light,
@@ -2663,6 +2680,7 @@ EXPORT_SYMBOL(lookup_one_len);
 EXPORT_SYMBOL(page_follow_link_light);
 EXPORT_SYMBOL(page_put_link);
 EXPORT_SYMBOL(page_readlink);
+EXPORT_SYMBOL(__page_symlink);
 EXPORT_SYMBOL(page_symlink);
 EXPORT_SYMBOL(page_symlink_inode_operations);
 EXPORT_SYMBOL(path_lookup);