Merge tag 'docs-5.15' of git://git.lwn.net/linux

[linux-2.6-microblaze.git] / fs / namei.c

diff --git a/fs/namei.c b/fs/namei.c
index e2425c0..d049d39 100644 (file)
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -2598,8 +2598,9 @@ int vfs_path_lookup(struct dentry *dentry, struct vfsmount *mnt,
 }
 EXPORT_SYMBOL(vfs_path_lookup);
 
-static int lookup_one_len_common(const char *name, struct dentry *base,
-                                int len, struct qstr *this)
+static int lookup_one_common(struct user_namespace *mnt_userns,
+                            const char *name, struct dentry *base, int len,
+                            struct qstr *this)
 {
        this->name = name;
        this->len = len;
@@ -2627,7 +2628,7 @@ static int lookup_one_len_common(const char *name, struct dentry *base,
                        return err;
        }
 
-       return inode_permission(&init_user_ns, base->d_inode, MAY_EXEC);
+       return inode_permission(mnt_userns, base->d_inode, MAY_EXEC);
 }
 
 /**
@@ -2651,7 +2652,7 @@ struct dentry *try_lookup_one_len(const char *name, struct dentry *base, int len
 
        WARN_ON_ONCE(!inode_is_locked(base->d_inode));
 
-       err = lookup_one_len_common(name, base, len, &this);
+       err = lookup_one_common(&init_user_ns, name, base, len, &this);
        if (err)
                return ERR_PTR(err);
 
@@ -2678,7 +2679,7 @@ struct dentry *lookup_one_len(const char *name, struct dentry *base, int len)
 
        WARN_ON_ONCE(!inode_is_locked(base->d_inode));
 
-       err = lookup_one_len_common(name, base, len, &this);
+       err = lookup_one_common(&init_user_ns, name, base, len, &this);
        if (err)
                return ERR_PTR(err);
 
@@ -2687,6 +2688,36 @@ struct dentry *lookup_one_len(const char *name, struct dentry *base, int len)
 }
 EXPORT_SYMBOL(lookup_one_len);
 
+/**
+ * lookup_one - filesystem helper to lookup single pathname component
+ * @mnt_userns:        user namespace of the mount the lookup is performed from
+ * @name:      pathname component to lookup
+ * @base:      base directory to lookup from
+ * @len:       maximum length @len should be interpreted to
+ *
+ * Note that this routine is purely a helper for filesystem usage and should
+ * not be called by generic code.
+ *
+ * The caller must hold base->i_mutex.
+ */
+struct dentry *lookup_one(struct user_namespace *mnt_userns, const char *name,
+                         struct dentry *base, int len)
+{
+       struct dentry *dentry;
+       struct qstr this;
+       int err;
+
+       WARN_ON_ONCE(!inode_is_locked(base->d_inode));
+
+       err = lookup_one_common(mnt_userns, name, base, len, &this);
+       if (err)
+               return ERR_PTR(err);
+
+       dentry = lookup_dcache(&this, base, 0);
+       return dentry ? dentry : __lookup_slow(&this, base, 0);
+}
+EXPORT_SYMBOL(lookup_one);
+
 /**
  * lookup_one_len_unlocked - filesystem helper to lookup single pathname component
  * @name:      pathname component to lookup
@@ -2706,7 +2737,7 @@ struct dentry *lookup_one_len_unlocked(const char *name,
        int err;
        struct dentry *ret;
 
-       err = lookup_one_len_common(name, base, len, &this);
+       err = lookup_one_common(&init_user_ns, name, base, len, &this);
        if (err)
                return ERR_PTR(err);
 
@@ -3046,9 +3077,7 @@ static int handle_truncate(struct user_namespace *mnt_userns, struct file *filp)
        /*
         * Refuse to truncate files with mandatory locks held on them.
         */
-       error = locks_verify_locked(filp);
-       if (!error)
-               error = security_path_truncate(path);
+       error = security_path_truncate(path);
        if (!error) {
                error = do_truncate(mnt_userns, path->dentry, 0,
                                    ATTR_MTIME|ATTR_CTIME|ATTR_OPEN,
@@ -4223,8 +4252,7 @@ int vfs_symlink(struct user_namespace *mnt_userns, struct inode *dir,
 }
 EXPORT_SYMBOL(vfs_symlink);
 
-static int do_symlinkat(struct filename *from, int newdfd,
-                 struct filename *to)
+int do_symlinkat(struct filename *from, int newdfd, struct filename *to)
 {
        int error;
        struct dentry *dentry;
@@ -4369,7 +4397,7 @@ EXPORT_SYMBOL(vfs_link);
  * with linux 2.0, and to avoid hard-linking to directories
  * and other special files.  --ADM
  */
-static int do_linkat(int olddfd, struct filename *old, int newdfd,
+int do_linkat(int olddfd, struct filename *old, int newdfd,
              struct filename *new, int flags)
 {
        struct user_namespace *mnt_userns;