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block: raid fixups for removal of bi_hw_segments
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Signed-off-by: Jens Axboe <[email protected]>
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Jens Axboe committed Oct 9, 2008
1 parent 5df97b9 commit 960e739
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Showing 3 changed files with 51 additions and 17 deletions.
1 change: 0 additions & 1 deletion drivers/md/raid1.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1787,7 +1787,6 @@ static sector_t sync_request(mddev_t *mddev, sector_t sector_nr, int *skipped, i
bio->bi_vcnt = 0;
bio->bi_idx = 0;
bio->bi_phys_segments = 0;
bio->bi_hw_segments = 0;
bio->bi_size = 0;
bio->bi_end_io = NULL;
bio->bi_private = NULL;
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1 change: 0 additions & 1 deletion drivers/md/raid10.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1944,7 +1944,6 @@ static sector_t sync_request(mddev_t *mddev, sector_t sector_nr, int *skipped, i
bio->bi_vcnt = 0;
bio->bi_idx = 0;
bio->bi_phys_segments = 0;
bio->bi_hw_segments = 0;
bio->bi_size = 0;
}

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66 changes: 51 additions & 15 deletions drivers/md/raid5.c
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Original file line number Diff line number Diff line change
Expand Up @@ -101,6 +101,40 @@
const char raid6_empty_zero_page[PAGE_SIZE] __attribute__((aligned(256)));
#endif

/*
* We maintain a biased count of active stripes in the bottom 8 bits of
* bi_phys_segments, and a count of processed stripes in the upper 8 bits
*/
static inline int raid5_bi_phys_segments(struct bio *bio)
{
return bio->bi_phys_segments & 0xff;
}

static inline int raid5_bi_hw_segments(struct bio *bio)
{
return (bio->bi_phys_segments >> 8) & 0xff;
}

static inline int raid5_dec_bi_phys_segments(struct bio *bio)
{
--bio->bi_phys_segments;
return raid5_bi_phys_segments(bio);
}

static inline int raid5_dec_bi_hw_segments(struct bio *bio)
{
unsigned short val = raid5_bi_hw_segments(bio);

--val;
bio->bi_phys_segments = (val << 8) | raid5_bi_phys_segments(bio);
return val;
}

static inline void raid5_set_bi_hw_segments(struct bio *bio, unsigned int cnt)
{
bio->bi_phys_segments = raid5_bi_phys_segments(bio) || (cnt << 8);
}

static inline int raid6_next_disk(int disk, int raid_disks)
{
disk++;
Expand Down Expand Up @@ -507,7 +541,7 @@ static void ops_complete_biofill(void *stripe_head_ref)
while (rbi && rbi->bi_sector <
dev->sector + STRIPE_SECTORS) {
rbi2 = r5_next_bio(rbi, dev->sector);
if (--rbi->bi_phys_segments == 0) {
if (!raid5_dec_bi_phys_segments(rbi)) {
rbi->bi_next = return_bi;
return_bi = rbi;
}
Expand Down Expand Up @@ -1725,7 +1759,7 @@ static int add_stripe_bio(struct stripe_head *sh, struct bio *bi, int dd_idx, in
if (*bip)
bi->bi_next = *bip;
*bip = bi;
bi->bi_phys_segments ++;
bi->bi_phys_segments++;
spin_unlock_irq(&conf->device_lock);
spin_unlock(&sh->lock);

Expand Down Expand Up @@ -1819,7 +1853,7 @@ handle_failed_stripe(raid5_conf_t *conf, struct stripe_head *sh,
sh->dev[i].sector + STRIPE_SECTORS) {
struct bio *nextbi = r5_next_bio(bi, sh->dev[i].sector);
clear_bit(BIO_UPTODATE, &bi->bi_flags);
if (--bi->bi_phys_segments == 0) {
if (!raid5_dec_bi_phys_segments(bi)) {
md_write_end(conf->mddev);
bi->bi_next = *return_bi;
*return_bi = bi;
Expand All @@ -1834,7 +1868,7 @@ handle_failed_stripe(raid5_conf_t *conf, struct stripe_head *sh,
sh->dev[i].sector + STRIPE_SECTORS) {
struct bio *bi2 = r5_next_bio(bi, sh->dev[i].sector);
clear_bit(BIO_UPTODATE, &bi->bi_flags);
if (--bi->bi_phys_segments == 0) {
if (!raid5_dec_bi_phys_segments(bi)) {
md_write_end(conf->mddev);
bi->bi_next = *return_bi;
*return_bi = bi;
Expand All @@ -1858,7 +1892,7 @@ handle_failed_stripe(raid5_conf_t *conf, struct stripe_head *sh,
struct bio *nextbi =
r5_next_bio(bi, sh->dev[i].sector);
clear_bit(BIO_UPTODATE, &bi->bi_flags);
if (--bi->bi_phys_segments == 0) {
if (!raid5_dec_bi_phys_segments(bi)) {
bi->bi_next = *return_bi;
*return_bi = bi;
}
Expand Down Expand Up @@ -2033,7 +2067,7 @@ static void handle_stripe_clean_event(raid5_conf_t *conf,
while (wbi && wbi->bi_sector <
dev->sector + STRIPE_SECTORS) {
wbi2 = r5_next_bio(wbi, dev->sector);
if (--wbi->bi_phys_segments == 0) {
if (!raid5_dec_bi_phys_segments(wbi)) {
md_write_end(conf->mddev);
wbi->bi_next = *return_bi;
*return_bi = wbi;
Expand Down Expand Up @@ -2814,7 +2848,7 @@ static bool handle_stripe6(struct stripe_head *sh, struct page *tmp_page)
copy_data(0, rbi, dev->page, dev->sector);
rbi2 = r5_next_bio(rbi, dev->sector);
spin_lock_irq(&conf->device_lock);
if (--rbi->bi_phys_segments == 0) {
if (!raid5_dec_bi_phys_segments(rbi)) {
rbi->bi_next = return_bi;
return_bi = rbi;
}
Expand Down Expand Up @@ -3155,8 +3189,11 @@ static struct bio *remove_bio_from_retry(raid5_conf_t *conf)
if(bi) {
conf->retry_read_aligned_list = bi->bi_next;
bi->bi_next = NULL;
/*
* this sets the active strip count to 1 and the processed
* strip count to zero (upper 8 bits)
*/
bi->bi_phys_segments = 1; /* biased count of active stripes */
bi->bi_hw_segments = 0; /* count of processed stripes */
}

return bi;
Expand Down Expand Up @@ -3206,8 +3243,7 @@ static int bio_fits_rdev(struct bio *bi)
if ((bi->bi_size>>9) > q->max_sectors)
return 0;
blk_recount_segments(q, bi);
if (bi->bi_phys_segments > q->max_phys_segments ||
bi->bi_hw_segments > q->max_hw_segments)
if (bi->bi_phys_segments > q->max_phys_segments)
return 0;

if (q->merge_bvec_fn)
Expand Down Expand Up @@ -3468,7 +3504,7 @@ static int make_request(struct request_queue *q, struct bio * bi)

}
spin_lock_irq(&conf->device_lock);
remaining = --bi->bi_phys_segments;
remaining = raid5_dec_bi_phys_segments(bi);
spin_unlock_irq(&conf->device_lock);
if (remaining == 0) {

Expand Down Expand Up @@ -3752,23 +3788,23 @@ static int retry_aligned_read(raid5_conf_t *conf, struct bio *raid_bio)
sector += STRIPE_SECTORS,
scnt++) {

if (scnt < raid_bio->bi_hw_segments)
if (scnt < raid5_bi_hw_segments(raid_bio))
/* already done this stripe */
continue;

sh = get_active_stripe(conf, sector, conf->raid_disks, pd_idx, 1);

if (!sh) {
/* failed to get a stripe - must wait */
raid_bio->bi_hw_segments = scnt;
raid5_set_bi_hw_segments(raid_bio, scnt);
conf->retry_read_aligned = raid_bio;
return handled;
}

set_bit(R5_ReadError, &sh->dev[dd_idx].flags);
if (!add_stripe_bio(sh, raid_bio, dd_idx, 0)) {
release_stripe(sh);
raid_bio->bi_hw_segments = scnt;
raid5_set_bi_hw_segments(raid_bio, scnt);
conf->retry_read_aligned = raid_bio;
return handled;
}
Expand All @@ -3778,7 +3814,7 @@ static int retry_aligned_read(raid5_conf_t *conf, struct bio *raid_bio)
handled++;
}
spin_lock_irq(&conf->device_lock);
remaining = --raid_bio->bi_phys_segments;
remaining = raid5_dec_bi_phys_segments(raid_bio);
spin_unlock_irq(&conf->device_lock);
if (remaining == 0)
bio_endio(raid_bio, 0);
Expand Down

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