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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: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Mike Snitzer 2016-06-02 15:27:22 -04:00
parent bfcee0e312
commit e6ca5e1a03
1 changed files with 43 additions and 56 deletions
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99
drivers/md/dm-raid.c
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@ -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)