lift sb_start_write() out of ->write()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

drivers/block/loop.c

@@ -230,9 +230,11 @@ static int __do_lo_send_write(struct file *file,
 	ssize_t bw;
 	mm_segment_t old_fs = get_fs();
 
+	file_start_write(file);
 	set_fs(get_ds());
 	bw = file->f_op->write(file, buf, len, &pos);
 	set_fs(old_fs);
+	file_end_write(file);
 	if (likely(bw == len))
 		return 0;
 	printk(KERN_ERR "loop: Write error at byte offset %llu, length %i.\n",

fs/cachefiles/rdwr.c

@@ -962,12 +962,14 @@ int cachefiles_write_page(struct fscache_storage *op, struct page *page)
 			}
 
 			data = kmap(page);
+			file_start_write(file);
 			old_fs = get_fs();
 			set_fs(KERNEL_DS);
 			ret = file->f_op->write(
 				file, (const void __user *) data, len, &pos);
 			set_fs(old_fs);
 			kunmap(page);
+			file_end_write(file);
 			if (ret != len)
 				ret = -EIO;
 		}

fs/coda/file.c

@@ -79,6 +79,7 @@ coda_file_write(struct file *coda_file, const char __user *buf, size_t count, lo
 		return -EINVAL;
 
 	host_inode = file_inode(host_file);
+	file_start_write(host_file);
 	mutex_lock(&coda_inode->i_mutex);
 
 	ret = host_file->f_op->write(host_file, buf, count, ppos);
@@ -87,6 +88,7 @@ coda_file_write(struct file *coda_file, const char __user *buf, size_t count, lo
 	coda_inode->i_blocks = (coda_inode->i_size + 511) >> 9;
 	coda_inode->i_mtime = coda_inode->i_ctime = CURRENT_TIME_SEC;
 	mutex_unlock(&coda_inode->i_mutex);
+	file_end_write(host_file);
 
 	return ret;
 }

fs/coredump.c

@@ -629,9 +629,11 @@ void do_coredump(siginfo_t *siginfo)
 		goto close_fail;
 	if (displaced)
 		put_files_struct(displaced);
+	file_start_write(cprm.file);
 	retval = binfmt->core_dump(&cprm);
 	if (retval)
 		current->signal->group_exit_code |= 0x80;
+	file_end_write(cprm.file);
 
 	if (ispipe && core_pipe_limit)
 		wait_for_dump_helpers(cprm.file);

fs/read_write.c

@@ -398,7 +398,6 @@ ssize_t do_sync_write(struct file *filp, const char __user *buf, size_t len, lof
 	struct kiocb kiocb;
 	ssize_t ret;
 
-	file_start_write(filp);
 	init_sync_kiocb(&kiocb, filp);
 	kiocb.ki_pos = *ppos;
 	kiocb.ki_left = len;
@@ -414,7 +413,6 @@ ssize_t do_sync_write(struct file *filp, const char __user *buf, size_t len, lof
 	if (-EIOCBQUEUED == ret)
 		ret = wait_on_sync_kiocb(&kiocb);
 	*ppos = kiocb.ki_pos;
-	file_end_write(filp);
 	return ret;
 }
 
@@ -458,6 +456,7 @@ ssize_t vfs_write(struct file *file, const char __user *buf, size_t count, loff_
 	ret = rw_verify_area(WRITE, file, pos, count);
 	if (ret >= 0) {
 		count = ret;
+		file_start_write(file);
 		if (file->f_op->write)
 			ret = file->f_op->write(file, buf, count, pos);
 		else
@@ -467,6 +466,7 @@ ssize_t vfs_write(struct file *file, const char __user *buf, size_t count, loff_
 			add_wchar(current, ret);
 		}
 		inc_syscw(current);
+		file_end_write(file);
 	}
 
 	return ret;
@@ -758,16 +758,18 @@ static ssize_t do_readv_writev(int type, struct file *file,
 	} else {
 		fn = (io_fn_t)file->f_op->write;
 		fnv = file->f_op->aio_write;
+		file_start_write(file);
 	}
 
-	if (fnv) {
-		file_start_write(file);
+	if (fnv)
 		ret = do_sync_readv_writev(file, iov, nr_segs, tot_len,
 						pos, fnv);
-		file_end_write(file);
-	} else
+	else
 		ret = do_loop_readv_writev(file, iov, nr_segs, pos, fn);
 
+	if (type != READ)
+		file_end_write(file);
+
 out:
 	if (iov != iovstack)
 		kfree(iov);
@@ -936,16 +938,18 @@ static ssize_t compat_do_readv_writev(int type, struct file *file,
 	} else {
 		fn = (io_fn_t)file->f_op->write;
 		fnv = file->f_op->aio_write;
+		file_start_write(file);
 	}
 
-	if (fnv) {
-		file_start_write(file);
+	if (fnv)
 		ret = do_sync_readv_writev(file, iov, nr_segs, tot_len,
 						pos, fnv);
-		file_end_write(file);
-	} else
+	else
 		ret = do_loop_readv_writev(file, iov, nr_segs, pos, fn);
 
+	if (type != READ)
+		file_end_write(file);
+
 out:
 	if (iov != iovstack)
 		kfree(iov);

fs/splice.c

@@ -1052,7 +1052,9 @@ static int write_pipe_buf(struct pipe_inode_info *pipe, struct pipe_buffer *buf,
 	loff_t tmp = sd->pos;
 
 	data = buf->ops->map(pipe, buf, 0);
+	file_start_write(sd->u.file);
 	ret = __kernel_write(sd->u.file, data + buf->offset, sd->len, &tmp);
+	file_end_write(sd->u.file);
 	buf->ops->unmap(pipe, buf, data);
 
 	return ret;

kernel/acct.c

@@ -543,6 +543,7 @@ static void do_acct_process(struct bsd_acct_struct *acct,
 	 * Kernel segment override to datasegment and write it
 	 * to the accounting file.
 	 */
+	file_start_write(file);
 	fs = get_fs();
 	set_fs(KERNEL_DS);
 	/*
@@ -554,6 +555,7 @@ static void do_acct_process(struct bsd_acct_struct *acct,
 			       sizeof(acct_t), &file->f_pos);
 	current->signal->rlim[RLIMIT_FSIZE].rlim_cur = flim;
 	set_fs(fs);
+	file_end_write(file);
 out:
 	revert_creds(orig_cred);
 }

mm/filemap_xip.c

@@ -404,8 +404,6 @@ xip_file_write(struct file *filp, const char __user *buf, size_t len,
 	loff_t pos;
 	ssize_t ret;
 
-	sb_start_write(inode->i_sb);
-
 	mutex_lock(&inode->i_mutex);
 
 	if (!access_ok(VERIFY_READ, buf, len)) {
@@ -439,7 +437,6 @@ xip_file_write(struct file *filp, const char __user *buf, size_t len,
 	current->backing_dev_info = NULL;
  out_up:
 	mutex_unlock(&inode->i_mutex);
-	sb_end_write(inode->i_sb);
 	return ret;
 }
 EXPORT_SYMBOL_GPL(xip_file_write);