dm.c (c217649bf2d60ac119afd71d938278cffd55962b) dm.c (4a1aeb98297e17f4e0a8cdda919e63bf528b2e5d)
1/*
2 * Copyright (C) 2001, 2002 Sistina Software (UK) Limited.
3 * Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved.
4 *
5 * This file is released under the GPL.
6 */
7
8#include "dm.h"

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27
28/*
29 * Cookies are numeric values sent with CHANGE and REMOVE
30 * uevents while resuming, removing or renaming the device.
31 */
32#define DM_COOKIE_ENV_VAR_NAME "DM_COOKIE"
33#define DM_COOKIE_LENGTH 24
34
1/*
2 * Copyright (C) 2001, 2002 Sistina Software (UK) Limited.
3 * Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved.
4 *
5 * This file is released under the GPL.
6 */
7
8#include "dm.h"

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27
28/*
29 * Cookies are numeric values sent with CHANGE and REMOVE
30 * uevents while resuming, removing or renaming the device.
31 */
32#define DM_COOKIE_ENV_VAR_NAME "DM_COOKIE"
33#define DM_COOKIE_LENGTH 24
34
35static DEFINE_MUTEX(dm_mutex);
36static const char *_name = DM_NAME;
37
38static unsigned int major = 0;
39static unsigned int _major = 0;
40
41static DEFINE_SPINLOCK(_minor_lock);
42/*
43 * For bio-based dm.

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323{
324 return test_bit(DMF_DELETING, &md->flags);
325}
326
327static int dm_blk_open(struct block_device *bdev, fmode_t mode)
328{
329 struct mapped_device *md;
330
35static const char *_name = DM_NAME;
36
37static unsigned int major = 0;
38static unsigned int _major = 0;
39
40static DEFINE_SPINLOCK(_minor_lock);
41/*
42 * For bio-based dm.

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322{
323 return test_bit(DMF_DELETING, &md->flags);
324}
325
326static int dm_blk_open(struct block_device *bdev, fmode_t mode)
327{
328 struct mapped_device *md;
329
331 mutex_lock(&dm_mutex);
332 spin_lock(&_minor_lock);
333
334 md = bdev->bd_disk->private_data;
335 if (!md)
336 goto out;
337
338 if (test_bit(DMF_FREEING, &md->flags) ||
339 dm_deleting_md(md)) {
340 md = NULL;
341 goto out;
342 }
343
344 dm_get(md);
345 atomic_inc(&md->open_count);
346
347out:
348 spin_unlock(&_minor_lock);
330 spin_lock(&_minor_lock);
331
332 md = bdev->bd_disk->private_data;
333 if (!md)
334 goto out;
335
336 if (test_bit(DMF_FREEING, &md->flags) ||
337 dm_deleting_md(md)) {
338 md = NULL;
339 goto out;
340 }
341
342 dm_get(md);
343 atomic_inc(&md->open_count);
344
345out:
346 spin_unlock(&_minor_lock);
349 mutex_unlock(&dm_mutex);
350
351 return md ? 0 : -ENXIO;
352}
353
354static int dm_blk_close(struct gendisk *disk, fmode_t mode)
355{
356 struct mapped_device *md = disk->private_data;
357
347
348 return md ? 0 : -ENXIO;
349}
350
351static int dm_blk_close(struct gendisk *disk, fmode_t mode)
352{
353 struct mapped_device *md = disk->private_data;
354
358 mutex_lock(&dm_mutex);
355 spin_lock(&_minor_lock);
356
359 atomic_dec(&md->open_count);
360 dm_put(md);
357 atomic_dec(&md->open_count);
358 dm_put(md);
361 mutex_unlock(&dm_mutex);
362
359
360 spin_unlock(&_minor_lock);
361
363 return 0;
364}
365
366int dm_open_count(struct mapped_device *md)
367{
368 return atomic_read(&md->open_count);
369}
370

--- 2349 unchanged lines hidden --- 		362 return 0;
363}
364
365int dm_open_count(struct mapped_device *md)
366{
367 return atomic_read(&md->open_count);
368}
369

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