Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

Pull misc vfs updates from Al Viro:
 "Assorted stuff, with no common topic whatsoever..."

* 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  libfs: document simple_get_link()
  Documentation/filesystems/Locking: fix ->get_link() prototype
  Documentation/filesystems/vfs.txt: document how ->i_link works
  Documentation/filesystems/vfs.txt: remove bogus "Last updated" date
  fs: use timespec64 in relatime_need_update
  fs/block_dev.c: remove unused include

Author: torvalds

Documentation/filesystems/Locking

@@ -52,7 +52,7 @@ prototypes:
 	int (*rename) (struct inode *, struct dentry *,
 			struct inode *, struct dentry *, unsigned int);
 	int (*readlink) (struct dentry *, char __user *,int);
-	const char *(*get_link) (struct dentry *, struct inode *, void **);
+	const char *(*get_link) (struct dentry *, struct inode *, struct delayed_call *);
 	void (*truncate) (struct inode *);
 	int (*permission) (struct inode *, int, unsigned int);
 	int (*get_acl)(struct inode *, int);

Documentation/filesystems/vfs.txt

@@ -3,8 +3,6 @@
 
 	Original author: Richard Gooch <[email protected]>
 
-		  Last updated on June 24, 2007.
-
   Copyright (C) 1999 Richard Gooch
   Copyright (C) 2005 Pekka Enberg
 
@@ -465,6 +463,12 @@ otherwise noted.
 	argument.  If request can't be handled without leaving RCU mode,
 	have it return ERR_PTR(-ECHILD).
 
+	If the filesystem stores the symlink target in ->i_link, the
+	VFS may use it directly without calling ->get_link(); however,
+	->get_link() must still be provided.  ->i_link must not be
+	freed until after an RCU grace period.  Writing to ->i_link
+	post-iget() time requires a 'release' memory barrier.
+
   readlink: this is now just an override for use by readlink(2) for the
 	cases when ->get_link uses nd_jump_link() or object is not in
 	fact a symlink.  Normally filesystems should only implement

fs/block_dev.c

@@ -30,7 +30,6 @@
 #include <linux/log2.h>
 #include <linux/cleancache.h>
 #include <linux/dax.h>
-#include <linux/badblocks.h>
 #include <linux/task_io_accounting_ops.h>
 #include <linux/falloc.h>
 #include <linux/uaccess.h>

fs/inode.c

@@ -1613,7 +1613,7 @@ EXPORT_SYMBOL(bmap);
  * passed since the last atime update.
  */
 static int relatime_need_update(struct vfsmount *mnt, struct inode *inode,
-			     struct timespec now)
+			     struct timespec64 now)
 {
 
 	if (!(mnt->mnt_flags & MNT_RELATIME))
@@ -1714,7 +1714,7 @@ bool atime_needs_update(const struct path *path, struct inode *inode)
 
 	now = current_time(inode);
 
-	if (!relatime_need_update(mnt, inode, timespec64_to_timespec(now)))
+	if (!relatime_need_update(mnt, inode, now))
 		return false;
 
 	if (timespec64_equal(&inode->i_atime, &now))

fs/libfs.c

@@ -1169,6 +1169,20 @@ simple_nosetlease(struct file *filp, long arg, struct file_lock **flp,
 }
 EXPORT_SYMBOL(simple_nosetlease);
 
+/**
+ * simple_get_link - generic helper to get the target of "fast" symlinks
+ * @dentry: not used here
+ * @inode: the symlink inode
+ * @done: not used here
+ *
+ * Generic helper for filesystems to use for symlink inodes where a pointer to
+ * the symlink target is stored in ->i_link.  NOTE: this isn't normally called,
+ * since as an optimization the path lookup code uses any non-NULL ->i_link
+ * directly, without calling ->get_link().  But ->get_link() still must be set,
+ * to mark the inode_operations as being for a symlink.
+ *
+ * Return: the symlink target
+ */
 const char *simple_get_link(struct dentry *dentry, struct inode *inode,
 			    struct delayed_call *done)
 {