dm-mpath.c (633a08b81206122469365b4c72eaeb71f04f2cb4) dm-mpath.c (586e80e6ee0d137c7d79fbae183bb37bc60ee97e)
1/*
2 * Copyright (C) 2003 Sistina Software Limited.
3 * Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved.
4 *
5 * This file is released under the GPL.
6 */
7
1/*
2 * Copyright (C) 2003 Sistina Software Limited.
3 * Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved.
4 *
5 * This file is released under the GPL.
6 */
7
8#include "dm.h"
8#include <linux/device-mapper.h>
9
9#include "dm-path-selector.h"
10#include "dm-bio-list.h"
11#include "dm-bio-record.h"
12#include "dm-uevent.h"
13
14#include <linux/ctype.h>
15#include <linux/init.h>
16#include <linux/mempool.h>

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1390
1391 return r;
1392
1393error:
1394 DMWARN("Unrecognised multipath message received.");
1395 return -EINVAL;
1396}
1397
10#include "dm-path-selector.h"
11#include "dm-bio-list.h"
12#include "dm-bio-record.h"
13#include "dm-uevent.h"
14
15#include <linux/ctype.h>
16#include <linux/init.h>
17#include <linux/mempool.h>

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1391
1392 return r;
1393
1394error:
1395 DMWARN("Unrecognised multipath message received.");
1396 return -EINVAL;
1397}
1398
1398static int multipath_ioctl(struct dm_target *ti, unsigned int cmd,
1399static int multipath_ioctl(struct dm_target *ti, struct inode *inode,
1400 struct file *filp, unsigned int cmd,
1399 unsigned long arg)
1400{
1401 struct multipath *m = (struct multipath *) ti->private;
1402 struct block_device *bdev = NULL;
1401 unsigned long arg)
1402{
1403 struct multipath *m = (struct multipath *) ti->private;
1404 struct block_device *bdev = NULL;
1403 fmode_t mode = 0;
1404 unsigned long flags;
1405 unsigned long flags;
1406 struct file fake_file = {};
1407 struct dentry fake_dentry = {};
1405 int r = 0;
1406
1408 int r = 0;
1409
1410 fake_file.f_path.dentry = &fake_dentry;
1411
1407 spin_lock_irqsave(&m->lock, flags);
1408
1409 if (!m->current_pgpath)
1410 __choose_pgpath(m);
1411
1412 if (m->current_pgpath) {
1413 bdev = m->current_pgpath->path.dev->bdev;
1412 spin_lock_irqsave(&m->lock, flags);
1413
1414 if (!m->current_pgpath)
1415 __choose_pgpath(m);
1416
1417 if (m->current_pgpath) {
1418 bdev = m->current_pgpath->path.dev->bdev;
1414 mode = m->current_pgpath->path.dev->mode;
1419 fake_dentry.d_inode = bdev->bd_inode;
1420 fake_file.f_mode = m->current_pgpath->path.dev->mode;
1415 }
1416
1417 if (m->queue_io)
1418 r = -EAGAIN;
1419 else if (!bdev)
1420 r = -EIO;
1421
1422 spin_unlock_irqrestore(&m->lock, flags);
1423
1421 }
1422
1423 if (m->queue_io)
1424 r = -EAGAIN;
1425 else if (!bdev)
1426 r = -EIO;
1427
1428 spin_unlock_irqrestore(&m->lock, flags);
1429
1424 return r ? : __blkdev_driver_ioctl(bdev, mode, cmd, arg);
1430 return r ? : blkdev_driver_ioctl(bdev->bd_inode, &fake_file,
1431 bdev->bd_disk, cmd, arg);
1425}
1426
1427/*-----------------------------------------------------------------
1428 * Module setup
1429 *---------------------------------------------------------------*/
1430static struct target_type multipath_target = {
1431 .name = "multipath",
1432 .version = {1, 0, 5},

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1433
1434/*-----------------------------------------------------------------
1435 * Module setup
1436 *---------------------------------------------------------------*/
1437static struct target_type multipath_target = {
1438 .name = "multipath",
1439 .version = {1, 0, 5},

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