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Commit e6ca5e1a authored by Mike Snitzer's avatar Mike Snitzer
Browse files

dm raid: various code cleanups 



Renamed functions and variables with leading single underscore to have a
double underscore.  Renamed some functions to have better names.  Folded
functions that were split out without reason.

Signed-off-by: default avatarMike Snitzer <snitzer@redhat.com>
parent bfcee0e3

drivers/md/dm-raid.c

+43 −56
Original line number Diff line number Diff line
@@ -195,36 +195,26 @@ struct raid_set { 
	struct raid_dev dev[0];

};



/* Backup/restore raid set configuration helpers */

static void _rs_config_backup(struct raid_set *rs, struct rs_layout *l)

static void rs_config_backup(struct raid_set *rs)

{

	struct mddev *mddev = &rs->md;

	struct rs_layout *l = &rs->rs_layout;



	l->new_level = mddev->new_level;

	l->new_layout = mddev->new_layout;

	l->new_chunk_sectors = mddev->new_chunk_sectors;

}



static void rs_config_backup(struct raid_set *rs)

{

	return _rs_config_backup(rs, &rs->rs_layout);

}



static void _rs_config_restore(struct raid_set *rs, struct rs_layout *l)

static void rs_config_restore(struct raid_set *rs)

{

	struct mddev *mddev = &rs->md;

	struct rs_layout *l = &rs->rs_layout;



	mddev->new_level = l->new_level;

	mddev->new_layout = l->new_layout;

	mddev->new_chunk_sectors = l->new_chunk_sectors;

}



static void rs_config_restore(struct raid_set *rs)

{

	return _rs_config_restore(rs, &rs->rs_layout);

}

/* END: backup/restore raid set configuration helpers */



/* raid10 algorithms (i.e. formats) */

#define	ALGORITHM_RAID10_DEFAULT	0

#define	ALGORITHM_RAID10_NEAR		1
@@ -272,7 +262,7 @@ static bool __within_range(long v, long min, long max) 
static struct arg_name_flag {

	const unsigned long flag;

	const char *name;

} _arg_name_flags[] = {

} __arg_name_flags[] = {

	{ CTR_FLAG_SYNC, "sync"},

	{ CTR_FLAG_NOSYNC, "nosync"},

	{ CTR_FLAG_REBUILD, "rebuild"},
@@ -294,9 +284,9 @@ static struct arg_name_flag { 
static const char *dm_raid_arg_name_by_flag(const uint32_t flag)

{

	if (hweight32(flag) == 1) {

		struct arg_name_flag *anf = _arg_name_flags + ARRAY_SIZE(_arg_name_flags);

		struct arg_name_flag *anf = __arg_name_flags + ARRAY_SIZE(__arg_name_flags);



		while (anf-- > _arg_name_flags)

		while (anf-- > __arg_name_flags)

			if (flag & anf->flag)

				return anf->name;
@@ -365,7 +355,7 @@ static bool rt_is_raid456(struct raid_type *rt) 
/* END: raid level bools */



/* Return invalid ctr flags for the raid level of @rs */

static uint32_t _invalid_flags(struct raid_set *rs)

static uint32_t __invalid_flags(struct raid_set *rs)

{

	if (rt_is_raid0(rs->raid_type))

		return RAID0_INVALID_FLAGS;
@@ -388,7 +378,7 @@ static uint32_t _invalid_flags(struct raid_set *rs) 
 */

static int rs_check_for_invalid_flags(struct raid_set *rs)

{

	if (rs->ctr_flags & _invalid_flags(rs)) {

	if (rs->ctr_flags & __invalid_flags(rs)) {

		rs->ti->error = "Invalid flags combination";

		return -EINVAL;

	}
@@ -396,7 +386,6 @@ static int rs_check_for_invalid_flags(struct raid_set *rs) 
	return 0;

}





/* MD raid10 bit definitions and helpers */

#define RAID10_OFFSET			(1 << 16) /* stripes with data copies area adjacent on devices */

#define RAID10_BROCKEN_USE_FAR_SETS	(1 << 17) /* Broken in raid10.c: use sets instead of whole stripe rotation */
@@ -404,33 +393,33 @@ static int rs_check_for_invalid_flags(struct raid_set *rs) 
#define RAID10_FAR_COPIES_SHIFT		8	  /* raid10 # far copies shift (2nd byte of layout) */



/* Return md raid10 near copies for @layout */

static unsigned int _raid10_near_copies(int layout)

static unsigned int __raid10_near_copies(int layout)

{

	return layout & 0xFF;

}



/* Return md raid10 far copies for @layout */

static unsigned int _raid10_far_copies(int layout)

static unsigned int __raid10_far_copies(int layout)

{

	return _raid10_near_copies(layout >> RAID10_FAR_COPIES_SHIFT);

	return __raid10_near_copies(layout >> RAID10_FAR_COPIES_SHIFT);

}



/* Return true if md raid10 offset for @layout */

static unsigned int _is_raid10_offset(int layout)

static unsigned int __is_raid10_offset(int layout)

{

	return layout & RAID10_OFFSET;

}



/* Return true if md raid10 near for @layout */

static unsigned int _is_raid10_near(int layout)

static unsigned int __is_raid10_near(int layout)

{

	return !_is_raid10_offset(layout) && _raid10_near_copies(layout) > 1;

	return !__is_raid10_offset(layout) && __raid10_near_copies(layout) > 1;

}



/* Return true if md raid10 far for @layout */

static unsigned int _is_raid10_far(int layout)

static unsigned int __is_raid10_far(int layout)

{

	return !_is_raid10_offset(layout) && _raid10_far_copies(layout) > 1;

	return !__is_raid10_offset(layout) && __raid10_far_copies(layout) > 1;

}



/* Return md raid10 layout string for @layout */
@@ -442,13 +431,13 @@ static const char *raid10_md_layout_to_format(int layout) 
	 *

	 * Refer to MD's raid10.c for details

	 */

	if (_is_raid10_offset(layout))

	if (__is_raid10_offset(layout))

		return "offset";



	if (_raid10_near_copies(layout) > 1)

	if (__raid10_near_copies(layout) > 1)

		return "near";



	WARN_ON(_raid10_far_copies(layout) < 2);

	WARN_ON(__raid10_far_copies(layout) < 2);



	return "far";

}
@@ -466,12 +455,11 @@ static const int raid10_name_to_format(const char *name) 
	return -EINVAL;

}





/* Return md raid10 copies for @layout */

static unsigned int raid10_md_layout_to_copies(int layout)

{

	return _raid10_near_copies(layout) > 1 ?

	       _raid10_near_copies(layout) : _raid10_far_copies(layout);

	return __raid10_near_copies(layout) > 1 ?

		__raid10_near_copies(layout) : __raid10_far_copies(layout);

}



/* Return md raid10 format id for @format string */
@@ -513,17 +501,17 @@ static int raid10_format_to_md_layout(struct raid_set *rs, 
/* END: MD raid10 bit definitions and helpers */



/* Check for any of the raid10 algorithms */

static int _got_raid10(struct raid_type *rtp, const int layout)

static int __got_raid10(struct raid_type *rtp, const int layout)

{

	if (rtp->level == 10) {

		switch (rtp->algorithm) {

		case ALGORITHM_RAID10_DEFAULT:

		case ALGORITHM_RAID10_NEAR:

			return _is_raid10_near(layout);

			return __is_raid10_near(layout);

		case ALGORITHM_RAID10_OFFSET:

			return _is_raid10_offset(layout);

			return __is_raid10_offset(layout);

		case ALGORITHM_RAID10_FAR:

			return _is_raid10_far(layout);

			return __is_raid10_far(layout);

		default:

			break;

		}
@@ -552,7 +540,7 @@ static struct raid_type *get_raid_type_by_ll(const int level, const int layout) 
	while (rtp-- > raid_types) {

		/* RAID10 special checks based on @layout flags/properties */

		if (rtp->level == level &&

		    (_got_raid10(rtp, layout) || rtp->algorithm == layout))

		    (__got_raid10(rtp, layout) || rtp->algorithm == layout))

			return rtp;

	}
@@ -1352,10 +1340,10 @@ static int rs_check_takeover(struct raid_set *rs) 


	case 10:

		/* Can't takeover raid10_offset! */

		if (_is_raid10_offset(mddev->layout))

		if (__is_raid10_offset(mddev->layout))

			break;



		near_copies = _raid10_near_copies(mddev->layout);

		near_copies = __raid10_near_copies(mddev->layout);



		/* raid10* -> raid0 */

		if (mddev->new_level == 0) {
@@ -1369,7 +1357,7 @@ static int rs_check_takeover(struct raid_set *rs) 


			/* Can takeover raid10_far */

			if (near_copies == 1 &&

			   _raid10_far_copies(mddev->layout) > 1)

			    __raid10_far_copies(mddev->layout) > 1)

				return 0;



			break;
@@ -1377,7 +1365,7 @@ static int rs_check_takeover(struct raid_set *rs) 


		/* raid10_{near,far} -> raid1 */

		if (mddev->new_level == 1 &&

		    max(near_copies, _raid10_far_copies(mddev->layout)) == mddev->raid_disks)

		    max(near_copies, __raid10_far_copies(mddev->layout)) == mddev->raid_disks)

			return 0;



		/* raid10_{near,far} with 2 disks -> raid4/5 */
@@ -1914,8 +1902,8 @@ static int super_init_validation(struct raid_set *rs, struct md_rdev *rdev) 
				continue;



			if (role != r->raid_disk) {

				if (_is_raid10_near(mddev->layout)) {

					if (mddev->raid_disks % _raid10_near_copies(mddev->layout) ||

				if (__is_raid10_near(mddev->layout)) {

					if (mddev->raid_disks % __raid10_near_copies(mddev->layout) ||

					    rs->raid_disks % rs->raid10_copies) {

						rs->ti->error =

							"Cannot change raid10 near set to odd # of devices!";
@@ -2099,7 +2087,7 @@ static int analyse_superblocks(struct dm_target *ti, struct raid_set *rs) 
}



/* Userpace reordered disks -> adjust raid_disk indexes in @rs */

static void _reorder_raid_disk_indexes(struct raid_set *rs)

static void __reorder_raid_disk_indexes(struct raid_set *rs)

{

	int i = 0;

	struct md_rdev *rdev;
@@ -2123,7 +2111,7 @@ static int rs_setup_takeover(struct raid_set *rs) 
	if (rt_is_raid10(rs->raid_type)) {

		if (mddev->level == 0) {

			/* Userpace reordered disks -> adjust raid_disk indexes */

			_reorder_raid_disk_indexes(rs);

			__reorder_raid_disk_indexes(rs);



			/* raid0 -> raid10_far layout */

			mddev->layout = raid10_format_to_md_layout(rs, ALGORITHM_RAID10_FAR,
@@ -2400,7 +2388,7 @@ static const char *decipher_sync_action(struct mddev *mddev) 
 *  'a' = Alive but not in-sync

 *  'A' = Alive and in-sync

 */

static const char *_raid_dev_status(struct md_rdev *rdev, bool array_in_sync)

static const char *__raid_dev_status(struct md_rdev *rdev, bool array_in_sync)

{

	if (test_bit(Faulty, &rdev->flags))

		return "D";
@@ -2484,7 +2472,7 @@ static sector_t rs_get_progress(struct raid_set *rs, 
}



/* Helper to return @dev name or "-" if !@dev */

static const char *_get_dev_name(struct dm_dev *dev)

static const char *__get_dev_name(struct dm_dev *dev)

{

	return dev ? dev->name : "-";

}
@@ -2526,7 +2514,7 @@ static void raid_status(struct dm_target *ti, status_type_t type, 


		/* HM FIXME: do we want another state char for raid0? It shows 'D' or 'A' now */

		rdev_for_each(rdev, mddev)

			DMEMIT(_raid_dev_status(rdev, array_in_sync));

			DMEMIT(__raid_dev_status(rdev, array_in_sync));



		/*

		 * In-sync/Reshape ratio:
@@ -2634,8 +2622,8 @@ static void raid_status(struct dm_target *ti, status_type_t type, 
		rdev_for_each(rdev, mddev) {

			struct raid_dev *rd = container_of(rdev, struct raid_dev, rdev);



			DMEMIT(" %s %s", _get_dev_name(rd->meta_dev),

					 _get_dev_name(rd->data_dev));

			DMEMIT(" %s %s", __get_dev_name(rd->meta_dev),

					 __get_dev_name(rd->data_dev));

		}

	}

}
@@ -2792,8 +2780,7 @@ static void attempt_restore_of_faulty_devices(struct raid_set *rs) 
	}

}



/* Load the dirty region bitmap */

static int _bitmap_load(struct raid_set *rs)

static int __load_dirty_region_bitmap(struct raid_set *rs)

{

	int r = 0;
@@ -2819,7 +2806,7 @@ static int raid_preresume(struct dm_target *ti) 


	/*

	 * The superblocks need to be updated on disk if the

	 * array is new or _bitmap_load will overwrite them

	 * array is new or __load_dirty_region_bitmap will overwrite them

	 * in core with old data.

	 *

	 * In case the array got modified (takeover/reshape/resize)
@@ -2843,7 +2830,7 @@ static int raid_preresume(struct dm_target *ti) 
	configure_discard_support(rs);



	/* Load the bitmap from disk unless raid0 */

	return _bitmap_load(rs);

	return __load_dirty_region_bitmap(rs);

}



static void raid_resume(struct dm_target *ti)