[PATCH] replace inode_update_time with file_update_time

To allow various options to work per-mount instead of per-sb we need a
struct vfsmount when updating ctime and mtime.  This preparation patch
replaces the inode_update_time routine with a file_update_atime routine so
we can easily get at the vfsmount.  (and the file makes more sense in this
context anyway).  Also get rid of the unused second argument - we always
want to update the ctime when calling this routine.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Cc: Al Viro <viro@ftp.linux.org.uk>
Cc: Anton Altaparmakov <aia21@cantab.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

fs/inode.c

@@ -1204,16 +1204,20 @@ void update_atime(struct inode *inode)
 EXPORT_SYMBOL(update_atime);
 
 /**
- *	inode_update_time	-	update mtime and ctime time
- *	@inode: inode accessed
- *	@ctime_too: update ctime too
+ *	file_update_time	-	update mtime and ctime time
+ *	@file: file accessed
  *
- *	Update the mtime time on an inode and mark it for writeback.
- *	When ctime_too is specified update the ctime too.
+ *	Update the mtime and ctime members of an inode and mark the inode
+ *	for writeback.  Note that this function is meant exclusively for
+ *	usage in the file write path of filesystems, and filesystems may
+ *	choose to explicitly ignore update via this function with the
+ *	S_NOCTIME inode flag, e.g. for network filesystem where these
+ *	timestamps are handled by the server.
  */
 
-void inode_update_time(struct inode *inode, int ctime_too)
+void file_update_time(struct file *file)
 {
+	struct inode *inode = file->f_dentry->d_inode;
 	struct timespec now;
 	int sync_it = 0;
 
@@ -1227,16 +1231,15 @@ void inode_update_time(struct inode *inode, int ctime_too)
 		sync_it = 1;
 	inode->i_mtime = now;
 
-	if (ctime_too) {
 	if (!timespec_equal(&inode->i_ctime, &now))
 		sync_it = 1;
 	inode->i_ctime = now;
-	}
+
 	if (sync_it)
 		mark_inode_dirty_sync(inode);
 }
 
-EXPORT_SYMBOL(inode_update_time);
+EXPORT_SYMBOL(file_update_time);
 
 int inode_needs_sync(struct inode *inode)
 {

fs/ncpfs/file.c

@@ -262,7 +262,7 @@ ncp_file_write(struct file *file, const char __user *buf, size_t count, loff_t *
 	}
 	vfree(bouncebuffer);
 
-	inode_update_time(inode, 1);
+	file_update_time(file);
 
 	*ppos = pos;
 

fs/ntfs/file.c

@@ -2173,7 +2173,7 @@ static ssize_t ntfs_file_aio_write_nolock(struct kiocb *iocb,
 	err = remove_suid(file->f_dentry);
 	if (err)
 		goto out;
-	inode_update_time(inode, 1);
+	file_update_time(file);
 	written = ntfs_file_buffered_write(iocb, iov, nr_segs, pos, ppos,
 			count);
 out:

fs/ntfs/inode.c

@@ -2767,7 +2767,25 @@ int ntfs_truncate(struct inode *vi)
 	up_write(&ni->runlist.lock);
 done:
 	/* Update the mtime and ctime on the base inode. */
-	inode_update_time(VFS_I(base_ni), 1);
+	/* normally ->truncate shouldn't update ctime or mtime,
+	 * but ntfs did before so it got a copy & paste version
+	 * of file_update_time.  one day someone should fix this
+	 * for real.
+	 */
+	if (!IS_NOCMTIME(VFS_I(base_ni)) && !IS_RDONLY(VFS_I(base_ni))) {
+		struct timespec now = current_fs_time(VFS_I(base_ni)->i_sb);
+		int sync_it = 0;
+
+		if (!timespec_equal(&VFS_I(base_ni)->i_mtime, &now) ||
+		    !timespec_equal(&VFS_I(base_ni)->i_ctime, &now))
+			sync_it = 1;
+		VFS_I(base_ni)->i_mtime = now;
+		VFS_I(base_ni)->i_ctime = now;
+
+		if (sync_it)
+			mark_inode_dirty_sync(VFS_I(base_ni));
+	}
+
 	if (likely(!err)) {
 		NInoClearTruncateFailed(ni);
 		ntfs_debug("Done.");

fs/ocfs2/mmap.c

@@ -80,12 +80,8 @@ static struct vm_operations_struct ocfs2_file_vm_ops = {
 	.nopage = ocfs2_nopage,
 };
 
-int ocfs2_mmap(struct file *file,
-	       struct vm_area_struct *vma)
+int ocfs2_mmap(struct file *file, struct vm_area_struct *vma)
 {
-	struct address_space *mapping = file->f_dentry->d_inode->i_mapping;
-	struct inode *inode = mapping->host;
-
 	/* We don't want to support shared writable mappings yet. */
 	if (((vma->vm_flags & VM_SHARED) || (vma->vm_flags & VM_MAYSHARE))
 	    && ((vma->vm_flags & VM_WRITE) || (vma->vm_flags & VM_MAYWRITE))) {
@@ -95,7 +91,7 @@ int ocfs2_mmap(struct file *file,
 		return -EINVAL;
 	}
 
-	update_atime(inode);
+	file_accessed(file);
 	vma->vm_ops = &ocfs2_file_vm_ops;
 	return 0;
 }

fs/pipe.c

@@ -347,7 +347,7 @@ pipe_writev(struct file *filp, const struct iovec *_iov,
 		kill_fasync(PIPE_FASYNC_READERS(*inode), SIGIO, POLL_IN);
 	}
 	if (ret > 0)
-		inode_update_time(inode, 1);	/* mtime and ctime */
+		file_update_time(filp);
 	return ret;
 }
 

fs/reiserfs/file.c

@@ -1360,7 +1360,7 @@ static ssize_t reiserfs_file_write(struct file *file,	/* the file we are going t
 	if (res)
 		goto out;
 
-	inode_update_time(inode, 1);	/* Both mtime and ctime */
+	file_update_time(file);
 
 	// Ok, we are done with all the checks.
 

fs/xfs/linux-2.6/xfs_lrw.c

@@ -713,7 +713,7 @@ xfs_write(
 	}
 
 	if (likely(!(ioflags & IO_INVIS))) {
-		inode_update_time(inode, 1);
+		file_update_time(file);
 		xfs_ichgtime_fast(xip, inode,
 				  XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
 	}

include/linux/fs.h

@@ -1716,7 +1716,7 @@ extern ssize_t simple_read_from_buffer(void __user *, size_t, loff_t *, const vo
 extern int inode_change_ok(struct inode *, struct iattr *);
 extern int __must_check inode_setattr(struct inode *, struct iattr *);
 
-extern void inode_update_time(struct inode *inode, int ctime_too);
+extern void file_update_time(struct file *file);
 
 static inline ino_t parent_ino(struct dentry *dentry)
 {

mm/filemap.c

@@ -2108,7 +2108,7 @@ __generic_file_aio_write_nolock(struct kiocb *iocb, const struct iovec *iov,
 	if (err)
 		goto out;
 
-	inode_update_time(inode, 1);
+	file_update_time(file);
 
 	/* coalesce the iovecs and go direct-to-BIO for O_DIRECT */
 	if (unlikely(file->f_flags & O_DIRECT)) {

mm/filemap_xip.c

@@ -383,7 +383,7 @@ xip_file_write(struct file *filp, const char __user *buf, size_t len,
 	if (ret)
 		goto out_backing;
 
-	inode_update_time(inode, 1);
+	file_update_time(filp);
 
 	ret = __xip_file_write (filp, buf, count, pos, ppos);