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raid5: export some functions 

Next several patches use some raid5 functions, rename them with raid5
prefix and export out.

Signed-off-by: Shaohua Li <shli@fb.com>
Signed-off-by: NeilBrown <neilb@suse.com>
This commit is contained in:
Shaohua Li 2015-08-13 14:31:57 -07:00 committed by NeilBrown
parent 3069aa8def
commit 6d036f7d52
2 changed files with 57 additions and 51 deletions
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100
drivers/md/raid5.c
View File

@ -353,7 +353,7 @@ static void release_inactive_stripe_list(struct r5conf *conf,
struct list_head *list = &temp_inactive_list[size - 1];
/*
* We don't hold any lock here yet, get_active_stripe() might
* We don't hold any lock here yet, raid5_get_active_stripe() might
* remove stripes from the list
*/
if (!list_empty_careful(list)) {
@ -413,7 +413,7 @@ static int release_stripe_list(struct r5conf *conf,
return count;
}
static void release_stripe(struct stripe_head *sh)
void raid5_release_stripe(struct stripe_head *sh)
{
struct r5conf *conf = sh->raid_conf;
unsigned long flags;
@ -658,9 +658,9 @@ static int has_failed(struct r5conf *conf)
return 0;
}
static struct stripe_head *
get_active_stripe(struct r5conf *conf, sector_t sector,
int previous, int noblock, int noquiesce)
struct stripe_head *
raid5_get_active_stripe(struct r5conf *conf, sector_t sector,
int previous, int noblock, int noquiesce)
{
struct stripe_head *sh;
int hash = stripe_hash_locks_hash(sector);
@ -858,7 +858,7 @@ static void stripe_add_to_batch_list(struct r5conf *conf, struct stripe_head *sh
unlock_out:
unlock_two_stripes(head, sh);
out:
release_stripe(head);
raid5_release_stripe(head);
}
/* Determine if 'data_offset' or 'new_data_offset' should be used
@ -1208,7 +1208,7 @@ static void ops_complete_biofill(void *stripe_head_ref)
return_io(&return_bi);
set_bit(STRIPE_HANDLE, &sh->state);
release_stripe(sh);
raid5_release_stripe(sh);
}
static void ops_run_biofill(struct stripe_head *sh)
@ -1271,7 +1271,7 @@ static void ops_complete_compute(void *stripe_head_ref)
if (sh->check_state == check_state_compute_run)
sh->check_state = check_state_compute_result;
set_bit(STRIPE_HANDLE, &sh->state);
release_stripe(sh);
raid5_release_stripe(sh);
}
/* return a pointer to the address conversion region of the scribble buffer */
@ -1697,7 +1697,7 @@ static void ops_complete_reconstruct(void *stripe_head_ref)
}
set_bit(STRIPE_HANDLE, &sh->state);
release_stripe(sh);
raid5_release_stripe(sh);
}
static void
@ -1855,7 +1855,7 @@ static void ops_complete_check(void *stripe_head_ref)
sh->check_state = check_state_check_result;
set_bit(STRIPE_HANDLE, &sh->state);
release_stripe(sh);
raid5_release_stripe(sh);
}
static void ops_run_check_p(struct stripe_head *sh, struct raid5_percpu *percpu)
@ -2017,7 +2017,7 @@ static int grow_one_stripe(struct r5conf *conf, gfp_t gfp)
/* we just created an active stripe so... */
atomic_inc(&conf->active_stripes);
release_stripe(sh);
raid5_release_stripe(sh);
conf->max_nr_stripes++;
return 1;
}
@ -2236,7 +2236,7 @@ static int resize_stripes(struct r5conf *conf, int newsize)
if (!p)
err = -ENOMEM;
}
release_stripe(nsh);
raid5_release_stripe(nsh);
}
/* critical section pass, GFP_NOIO no longer needed */
@ -2394,7 +2394,7 @@ static void raid5_end_read_request(struct bio * bi)
rdev_dec_pending(rdev, conf->mddev);
clear_bit(R5_LOCKED, &sh->dev[i].flags);
set_bit(STRIPE_HANDLE, &sh->state);
release_stripe(sh);
raid5_release_stripe(sh);
}
static void raid5_end_write_request(struct bio *bi)
@ -2468,14 +2468,12 @@ static void raid5_end_write_request(struct bio *bi)
if (!test_and_clear_bit(R5_DOUBLE_LOCKED, &sh->dev[i].flags))
clear_bit(R5_LOCKED, &sh->dev[i].flags);
set_bit(STRIPE_HANDLE, &sh->state);
release_stripe(sh);
raid5_release_stripe(sh);
if (sh->batch_head && sh != sh->batch_head)
release_stripe(sh->batch_head);
raid5_release_stripe(sh->batch_head);
}
static sector_t compute_blocknr(struct stripe_head *sh, int i, int previous);
static void raid5_build_block(struct stripe_head *sh, int i, int previous)
{
struct r5dev *dev = &sh->dev[i];
@ -2491,7 +2489,7 @@ static void raid5_build_block(struct stripe_head *sh, int i, int previous)
dev->rreq.bi_private = sh;
dev->flags = 0;
dev->sector = compute_blocknr(sh, i, previous);
dev->sector = raid5_compute_blocknr(sh, i, previous);
}
static void error(struct mddev *mddev, struct md_rdev *rdev)
@ -2524,9 +2522,9 @@ static void error(struct mddev *mddev, struct md_rdev *rdev)
* Input: a 'big' sector number,
* Output: index of the data and parity disk, and the sector # in them.
*/
static sector_t raid5_compute_sector(struct r5conf *conf, sector_t r_sector,
int previous, int *dd_idx,
struct stripe_head *sh)
sector_t raid5_compute_sector(struct r5conf *conf, sector_t r_sector,
int previous, int *dd_idx,
struct stripe_head *sh)
{
sector_t stripe, stripe2;
sector_t chunk_number;
@ -2726,7 +2724,7 @@ static sector_t raid5_compute_sector(struct r5conf *conf, sector_t r_sector,
return new_sector;
}
static sector_t compute_blocknr(struct stripe_head *sh, int i, int previous)
sector_t raid5_compute_blocknr(struct stripe_head *sh, int i, int previous)
{
struct r5conf *conf = sh->raid_conf;
int raid_disks = sh->disks;
@ -3937,10 +3935,10 @@ static void handle_stripe_expansion(struct r5conf *conf, struct stripe_head *sh)
struct stripe_head *sh2;
struct async_submit_ctl submit;
sector_t bn = compute_blocknr(sh, i, 1);
sector_t bn = raid5_compute_blocknr(sh, i, 1);
sector_t s = raid5_compute_sector(conf, bn, 0,
&dd_idx, NULL);
sh2 = get_active_stripe(conf, s, 0, 1, 1);
sh2 = raid5_get_active_stripe(conf, s, 0, 1, 1);
if (sh2 == NULL)
/* so far only the early blocks of this stripe
* have been requested. When later blocks
@ -3950,7 +3948,7 @@ static void handle_stripe_expansion(struct r5conf *conf, struct stripe_head *sh)
if (!test_bit(STRIPE_EXPANDING, &sh2->state) ||
test_bit(R5_Expanded, &sh2->dev[dd_idx].flags)) {
/* must have already done this block */
release_stripe(sh2);
raid5_release_stripe(sh2);
continue;
}
@ -3971,7 +3969,7 @@ static void handle_stripe_expansion(struct r5conf *conf, struct stripe_head *sh)
set_bit(STRIPE_EXPAND_READY, &sh2->state);
set_bit(STRIPE_HANDLE, &sh2->state);
}
release_stripe(sh2);
raid5_release_stripe(sh2);
}
/* done submitting copies, wait for them to complete */
@ -4257,7 +4255,7 @@ static void break_stripe_batch_list(struct stripe_head *head_sh,
if (handle_flags == 0 ||
sh->state & handle_flags)
set_bit(STRIPE_HANDLE, &sh->state);
release_stripe(sh);
raid5_release_stripe(sh);
}
spin_lock_irq(&head_sh->stripe_lock);
head_sh->batch_head = NULL;
@ -4504,7 +4502,7 @@ static void handle_stripe(struct stripe_head *sh)
/* Finish reconstruct operations initiated by the expansion process */
if (sh->reconstruct_state == reconstruct_state_result) {
struct stripe_head *sh_src
= get_active_stripe(conf, sh->sector, 1, 1, 1);
= raid5_get_active_stripe(conf, sh->sector, 1, 1, 1);
if (sh_src && test_bit(STRIPE_EXPAND_SOURCE, &sh_src->state)) {
/* sh cannot be written until sh_src has been read.
* so arrange for sh to be delayed a little
@ -4514,11 +4512,11 @@ static void handle_stripe(struct stripe_head *sh)
if (!test_and_set_bit(STRIPE_PREREAD_ACTIVE,
&sh_src->state))
atomic_inc(&conf->preread_active_stripes);
release_stripe(sh_src);
raid5_release_stripe(sh_src);
goto finish;
}
if (sh_src)
release_stripe(sh_src);
raid5_release_stripe(sh_src);
sh->reconstruct_state = reconstruct_state_idle;
clear_bit(STRIPE_EXPANDING, &sh->state);
@ -5010,7 +5008,7 @@ static void release_stripe_plug(struct mddev *mddev,
struct raid5_plug_cb *cb;
if (!blk_cb) {
release_stripe(sh);
raid5_release_stripe(sh);
return;
}
@ -5026,7 +5024,7 @@ static void release_stripe_plug(struct mddev *mddev,
if (!test_and_set_bit(STRIPE_ON_UNPLUG_LIST, &sh->state))
list_add_tail(&sh->lru, &cb->list);
else
release_stripe(sh);
raid5_release_stripe(sh);
}
static void make_discard_request(struct mddev *mddev, struct bio *bi)
@ -5061,12 +5059,12 @@ static void make_discard_request(struct mddev *mddev, struct bio *bi)
DEFINE_WAIT(w);
int d;
again:
sh = get_active_stripe(conf, logical_sector, 0, 0, 0);
sh = raid5_get_active_stripe(conf, logical_sector, 0, 0, 0);
prepare_to_wait(&conf->wait_for_overlap, &w,
TASK_UNINTERRUPTIBLE);
set_bit(R5_Overlap, &sh->dev[sh->pd_idx].flags);
if (test_bit(STRIPE_SYNCING, &sh->state)) {
release_stripe(sh);
raid5_release_stripe(sh);
schedule();
goto again;
}
@ -5078,7 +5076,7 @@ static void make_discard_request(struct mddev *mddev, struct bio *bi)
if (sh->dev[d].towrite || sh->dev[d].toread) {
set_bit(R5_Overlap, &sh->dev[d].flags);
spin_unlock_irq(&sh->stripe_lock);
release_stripe(sh);
raid5_release_stripe(sh);
schedule();
goto again;
}
@ -5208,7 +5206,7 @@ static void make_request(struct mddev *mddev, struct bio * bi)
(unsigned long long)new_sector,
(unsigned long long)logical_sector);
sh = get_active_stripe(conf, new_sector, previous,
sh = raid5_get_active_stripe(conf, new_sector, previous,
(bi->bi_rw&RWA_MASK), 0);
if (sh) {
if (unlikely(previous)) {
@ -5229,7 +5227,7 @@ static void make_request(struct mddev *mddev, struct bio * bi)
must_retry = 1;
spin_unlock_irq(&conf->device_lock);
if (must_retry) {
release_stripe(sh);
raid5_release_stripe(sh);
schedule();
do_prepare = true;
goto retry;
@ -5239,14 +5237,14 @@ static void make_request(struct mddev *mddev, struct bio * bi)
/* Might have got the wrong stripe_head
* by accident
*/
release_stripe(sh);
raid5_release_stripe(sh);
goto retry;
}
if (rw == WRITE &&
logical_sector >= mddev->suspend_lo &&
logical_sector < mddev->suspend_hi) {
release_stripe(sh);
raid5_release_stripe(sh);
/* As the suspend_* range is controlled by
* userspace, we want an interruptible
* wait.
@ -5269,7 +5267,7 @@ static void make_request(struct mddev *mddev, struct bio * bi)
* and wait a while
*/
md_wakeup_thread(mddev->thread);
release_stripe(sh);
raid5_release_stripe(sh);
schedule();
do_prepare = true;
goto retry;
@ -5456,7 +5454,7 @@ static sector_t reshape_request(struct mddev *mddev, sector_t sector_nr, int *sk
for (i = 0; i < reshape_sectors; i += STRIPE_SECTORS) {
int j;
int skipped_disk = 0;
sh = get_active_stripe(conf, stripe_addr+i, 0, 0, 1);
sh = raid5_get_active_stripe(conf, stripe_addr+i, 0, 0, 1);
set_bit(STRIPE_EXPANDING, &sh->state);
atomic_inc(&conf->reshape_stripes);
/* If any of this stripe is beyond the end of the old
@ -5469,7 +5467,7 @@ static sector_t reshape_request(struct mddev *mddev, sector_t sector_nr, int *sk
if (conf->level == 6 &&
j == sh->qd_idx)
continue;
s = compute_blocknr(sh, j, 0);
s = raid5_compute_blocknr(sh, j, 0);
if (s < raid5_size(mddev, 0, 0)) {
skipped_disk = 1;
continue;
@ -5505,10 +5503,10 @@ static sector_t reshape_request(struct mddev *mddev, sector_t sector_nr, int *sk
if (last_sector >= mddev->dev_sectors)
last_sector = mddev->dev_sectors - 1;
while (first_sector <= last_sector) {
sh = get_active_stripe(conf, first_sector, 1, 0, 1);
sh = raid5_get_active_stripe(conf, first_sector, 1, 0, 1);
set_bit(STRIPE_EXPAND_SOURCE, &sh->state);
set_bit(STRIPE_HANDLE, &sh->state);
release_stripe(sh);
raid5_release_stripe(sh);
first_sector += STRIPE_SECTORS;
}
/* Now that the sources are clearly marked, we can release
@ -5517,7 +5515,7 @@ static sector_t reshape_request(struct mddev *mddev, sector_t sector_nr, int *sk
while (!list_empty(&stripes)) {
sh = list_entry(stripes.next, struct stripe_head, lru);
list_del_init(&sh->lru);
release_stripe(sh);
raid5_release_stripe(sh);
}
/* If this takes us to the resync_max point where we have to pause,
* then we need to write out the superblock.
@ -5615,9 +5613,9 @@ static inline sector_t sync_request(struct mddev *mddev, sector_t sector_nr, int
bitmap_cond_end_sync(mddev->bitmap, sector_nr, false);
sh = get_active_stripe(conf, sector_nr, 0, 1, 0);
sh = raid5_get_active_stripe(conf, sector_nr, 0, 1, 0);
if (sh == NULL) {
sh = get_active_stripe(conf, sector_nr, 0, 0, 0);
sh = raid5_get_active_stripe(conf, sector_nr, 0, 0, 0);
/* make sure we don't swamp the stripe cache if someone else
* is trying to get access
*/
@ -5641,7 +5639,7 @@ static inline sector_t sync_request(struct mddev *mddev, sector_t sector_nr, int
set_bit(STRIPE_SYNC_REQUESTED, &sh->state);
set_bit(STRIPE_HANDLE, &sh->state);
release_stripe(sh);
raid5_release_stripe(sh);
return STRIPE_SECTORS;
}
@ -5680,7 +5678,7 @@ static int retry_aligned_read(struct r5conf *conf, struct bio *raid_bio)
/* already done this stripe */
continue;
sh = get_active_stripe(conf, sector, 0, 1, 1);
sh = raid5_get_active_stripe(conf, sector, 0, 1, 1);
if (!sh) {
/* failed to get a stripe - must wait */
@ -5690,7 +5688,7 @@ static int retry_aligned_read(struct r5conf *conf, struct bio *raid_bio)
}
if (!add_stripe_bio(sh, raid_bio, dd_idx, 0, 0)) {
release_stripe(sh);
raid5_release_stripe(sh);
raid5_set_bi_processed_stripes(raid_bio, scnt);
conf->retry_read_aligned = raid_bio;
return handled;
@ -5698,7 +5696,7 @@ static int retry_aligned_read(struct r5conf *conf, struct bio *raid_bio)
set_bit(R5_ReadNoMerge, &sh->dev[dd_idx].flags);
handle_stripe(sh);
release_stripe(sh);
raid5_release_stripe(sh);
handled++;
}
remaining = raid5_dec_bi_active_stripes(raid_bio);

8
drivers/md/raid5.h
View File

@ -609,4 +609,12 @@ static inline int algorithm_is_DDF(int layout)
extern void md_raid5_kick_device(struct r5conf *conf);
extern int raid5_set_cache_size(struct mddev *mddev, int size);
extern sector_t raid5_compute_blocknr(struct stripe_head *sh, int i, int previous);
extern void raid5_release_stripe(struct stripe_head *sh);
extern sector_t raid5_compute_sector(struct r5conf *conf, sector_t r_sector,
int previous, int *dd_idx,
struct stripe_head *sh);
extern struct stripe_head *
raid5_get_active_stripe(struct r5conf *conf, sector_t sector,
int previous, int noblock, int noquiesce);
#endif