diff options
Diffstat (limited to 'drivers/md/raid5.c')
| -rw-r--r-- | drivers/md/raid5.c | 1494 |
1 files changed, 1055 insertions, 439 deletions
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index a5ba080d303b..3bbc6d647044 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -43,11 +43,14 @@ * miss any bits. */ +#include <linux/blkdev.h> #include <linux/kthread.h> -#include "raid6.h" - -#include <linux/raid/bitmap.h> +#include <linux/raid/pq.h> #include <linux/async_tx.h> +#include <linux/seq_file.h> +#include "md.h" +#include "raid5.h" +#include "bitmap.h" /* * Stripe cache @@ -91,11 +94,6 @@ #define printk_rl(args...) ((void) (printk_ratelimit() && printk(args))) -#if !RAID6_USE_EMPTY_ZERO_PAGE -/* In .bss so it's zeroed */ -const char raid6_empty_zero_page[PAGE_SIZE] __attribute__((aligned(256))); -#endif - /* * We maintain a biased count of active stripes in the bottom 16 bits of * bi_phys_segments, and a count of processed stripes in the upper 16 bits @@ -130,12 +128,42 @@ static inline void raid5_set_bi_hw_segments(struct bio *bio, unsigned int cnt) bio->bi_phys_segments = raid5_bi_phys_segments(bio) || (cnt << 16); } +/* Find first data disk in a raid6 stripe */ +static inline int raid6_d0(struct stripe_head *sh) +{ + if (sh->ddf_layout) + /* ddf always start from first device */ + return 0; + /* md starts just after Q block */ + if (sh->qd_idx == sh->disks - 1) + return 0; + else + return sh->qd_idx + 1; +} static inline int raid6_next_disk(int disk, int raid_disks) { disk++; return (disk < raid_disks) ? disk : 0; } +/* When walking through the disks in a raid5, starting at raid6_d0, + * We need to map each disk to a 'slot', where the data disks are slot + * 0 .. raid_disks-3, the parity disk is raid_disks-2 and the Q disk + * is raid_disks-1. This help does that mapping. + */ +static int raid6_idx_to_slot(int idx, struct stripe_head *sh, + int *count, int syndrome_disks) +{ + int slot; + + if (idx == sh->pd_idx) + return syndrome_disks; + if (idx == sh->qd_idx) + return syndrome_disks + 1; + slot = (*count)++; + return slot; +} + static void return_io(struct bio *return_bi) { struct bio *bi = return_bi; @@ -193,6 +221,7 @@ static void __release_stripe(raid5_conf_t *conf, struct stripe_head *sh) } } } + static void release_stripe(struct stripe_head *sh) { raid5_conf_t *conf = sh->raid_conf; @@ -270,9 +299,11 @@ static int grow_buffers(struct stripe_head *sh, int num) return 0; } -static void raid5_build_block(struct stripe_head *sh, int i); +static void raid5_build_block(struct stripe_head *sh, int i, int previous); +static void stripe_set_idx(sector_t stripe, raid5_conf_t *conf, int previous, + struct stripe_head *sh); -static void init_stripe(struct stripe_head *sh, sector_t sector, int pd_idx, int disks) +static void init_stripe(struct stripe_head *sh, sector_t sector, int previous) { raid5_conf_t *conf = sh->raid_conf; int i; @@ -287,11 +318,12 @@ static void init_stripe(struct stripe_head *sh, sector_t sector, int pd_idx, int remove_hash(sh); + sh->generation = conf->generation - previous; + sh->disks = previous ? conf->previous_raid_disks : conf->raid_disks; sh->sector = sector; - sh->pd_idx = pd_idx; + stripe_set_idx(sector, conf, previous, sh); sh->state = 0; - sh->disks = disks; for (i = sh->disks; i--; ) { struct r5dev *dev = &sh->dev[i]; @@ -305,12 +337,13 @@ static void init_stripe(struct stripe_head *sh, sector_t sector, int pd_idx, int BUG(); } dev->flags = 0; - raid5_build_block(sh, i); + raid5_build_block(sh, i, previous); } insert_hash(conf, sh); } -static struct stripe_head *__find_stripe(raid5_conf_t *conf, sector_t sector, int disks) +static struct stripe_head *__find_stripe(raid5_conf_t *conf, sector_t sector, + short generation) { struct stripe_head *sh; struct hlist_node *hn; @@ -318,7 +351,7 @@ static struct stripe_head *__find_stripe(raid5_conf_t *conf, sector_t sector, in CHECK_DEVLOCK(); pr_debug("__find_stripe, sector %llu\n", (unsigned long long)sector); hlist_for_each_entry(sh, hn, stripe_hash(conf, sector), hash) - if (sh->sector == sector && sh->disks == disks) + if (sh->sector == sector && sh->generation == generation) return sh; pr_debug("__stripe %llu not in cache\n", (unsigned long long)sector); return NULL; @@ -327,8 +360,9 @@ static struct stripe_head *__find_stripe(raid5_conf_t *conf, sector_t sector, in static void unplug_slaves(mddev_t *mddev); static void raid5_unplug_device(struct request_queue *q); -static struct stripe_head *get_active_stripe(raid5_conf_t *conf, sector_t sector, int disks, - int pd_idx, int noblock) +static struct stripe_head * +get_active_stripe(raid5_conf_t *conf, sector_t sector, + int previous, int noblock) { struct stripe_head *sh; @@ -340,7 +374,7 @@ static struct stripe_head *get_active_stripe(raid5_conf_t *conf, sector_t sector wait_event_lock_irq(conf->wait_for_stripe, conf->quiesce == 0, conf->device_lock, /* nothing */); - sh = __find_stripe(conf, sector, disks); + sh = __find_stripe(conf, sector, conf->generation - previous); if (!sh) { if (!conf->inactive_blocked) sh = get_free_stripe(conf); @@ -358,10 +392,11 @@ static struct stripe_head *get_active_stripe(raid5_conf_t *conf, sector_t sector ); conf->inactive_blocked = 0; } else - init_stripe(sh, sector, pd_idx, disks); + init_stripe(sh, sector, previous); } else { if (atomic_read(&sh->count)) { - BUG_ON(!list_empty(&sh->lru)); + BUG_ON(!list_empty(&sh->lru) + && !test_bit(STRIPE_EXPANDING, &sh->state)); } else { if (!test_bit(STRIPE_HANDLE, &sh->state)) atomic_inc(&conf->active_stripes); @@ -895,8 +930,10 @@ static int grow_stripes(raid5_conf_t *conf, int num) struct kmem_cache *sc; int devs = conf->raid_disks; - sprintf(conf->cache_name[0], "raid5-%s", mdname(conf->mddev)); - sprintf(conf->cache_name[1], "raid5-%s-alt", mdname(conf->mddev)); + sprintf(conf->cache_name[0], + "raid%d-%s", conf->level, mdname(conf->mddev)); + sprintf(conf->cache_name[1], + "raid%d-%s-alt", conf->level, mdname(conf->mddev)); conf->active_name = 0; sc = kmem_cache_create(conf->cache_name[conf->active_name], sizeof(struct stripe_head)+(devs-1)*sizeof(struct r5dev), @@ -911,7 +948,6 @@ static int grow_stripes(raid5_conf_t *conf, int num) return 0; } -#ifdef CONFIG_MD_RAID5_RESHAPE static int resize_stripes(raid5_conf_t *conf, int newsize) { /* Make all the stripes able to hold 'newsize' devices. @@ -1036,7 +1072,6 @@ static int resize_stripes(raid5_conf_t *conf, int newsize) conf->pool_size = newsize; return err; } -#endif static int drop_one_stripe(raid5_conf_t *conf) { @@ -1066,7 +1101,7 @@ static void shrink_stripes(raid5_conf_t *conf) static void raid5_end_read_request(struct bio * bi, int error) { - struct stripe_head *sh = bi->bi_private; + struct stripe_head *sh = bi->bi_private; raid5_conf_t *conf = sh->raid_conf; int disks = sh->disks, i; int uptodate = test_bit(BIO_UPTODATE, &bi->bi_flags); @@ -1148,7 +1183,7 @@ static void raid5_end_read_request(struct bio * bi, int error) static void raid5_end_write_request(struct bio *bi, int error) { - struct stripe_head *sh = bi->bi_private; + struct stripe_head *sh = bi->bi_private; raid5_conf_t *conf = sh->raid_conf; int disks = sh->disks, i; int uptodate = test_bit(BIO_UPTODATE, &bi->bi_flags); @@ -1176,9 +1211,9 @@ static void raid5_end_write_request(struct bio *bi, int error) } -static sector_t compute_blocknr(struct stripe_head *sh, int i); +static sector_t compute_blocknr(struct stripe_head *sh, int i, int previous); -static void raid5_build_block(struct stripe_head *sh, int i) +static void raid5_build_block(struct stripe_head *sh, int i, int previous) { struct r5dev *dev = &sh->dev[i]; @@ -1194,7 +1229,7 @@ static void raid5_build_block(struct stripe_head *sh, int i) dev->req.bi_private = sh; dev->flags = 0; - dev->sector = compute_blocknr(sh, i); + dev->sector = compute_blocknr(sh, i, previous); } static void error(mddev_t *mddev, mdk_rdev_t *rdev) @@ -1227,15 +1262,23 @@ static void error(mddev_t *mddev, mdk_rdev_t *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(sector_t r_sector, unsigned int raid_disks, - unsigned int data_disks, unsigned int * dd_idx, - unsigned int * pd_idx, raid5_conf_t *conf) +static sector_t raid5_compute_sector(raid5_conf_t *conf, sector_t r_sector, + int previous, int *dd_idx, + struct stripe_head *sh) { long stripe; unsigned long chunk_number; unsigned int chunk_offset; + int pd_idx, qd_idx; + int ddf_layout = 0; sector_t new_sector; - int sectors_per_chunk = conf->chunk_size >> 9; + int algorithm = previous ? conf->prev_algo + : conf->algorithm; + int sectors_per_chunk = previous ? (conf->prev_chunk >> 9) + : (conf->chunk_size >> 9); + int raid_disks = previous ? conf->previous_raid_disks + : conf->raid_disks; + int data_disks = raid_disks - conf->max_degraded; /* First compute the information on this sector */ @@ -1259,68 +1302,170 @@ static sector_t raid5_compute_sector(sector_t r_sector, unsigned int raid_disks, /* * Select the parity disk based on the user selected algorithm. */ + pd_idx = qd_idx = ~0; switch(conf->level) { case 4: - *pd_idx = data_disks; + pd_idx = data_disks; break; case 5: - switch (conf->algorithm) { + switch (algorithm) { case ALGORITHM_LEFT_ASYMMETRIC: - *pd_idx = data_disks - stripe % raid_disks; - if (*dd_idx >= *pd_idx) + pd_idx = data_disks - stripe % raid_disks; + if (*dd_idx >= pd_idx) (*dd_idx)++; break; case ALGORITHM_RIGHT_ASYMMETRIC: - *pd_idx = stripe % raid_disks; - if (*dd_idx >= *pd_idx) + pd_idx = stripe % raid_disks; + if (*dd_idx >= pd_idx) (*dd_idx)++; break; case ALGORITHM_LEFT_SYMMETRIC: - *pd_idx = data_disks - stripe % raid_disks; - *dd_idx = (*pd_idx + 1 + *dd_idx) % raid_disks; + pd_idx = data_disks - stripe % raid_disks; + *dd_idx = (pd_idx + 1 + *dd_idx) % raid_disks; break; case ALGORITHM_RIGHT_SYMMETRIC: - *pd_idx = stripe % raid_disks; - *dd_idx = (*pd_idx + 1 + *dd_idx) % raid_disks; + pd_idx = stripe % raid_disks; + *dd_idx = (pd_idx + 1 + *dd_idx) % raid_disks; + break; + case ALGORITHM_PARITY_0: + pd_idx = 0; + (*dd_idx)++; + break; + case ALGORITHM_PARITY_N: + pd_idx = data_disks; break; default: printk(KERN_ERR "raid5: unsupported algorithm %d\n", - conf->algorithm); + algorithm); + BUG(); } break; case 6: - /**** FIX THIS ****/ - switch (conf->algorithm) { + switch (algorithm) { case ALGORITHM_LEFT_ASYMMETRIC: - *pd_idx = raid_disks - 1 - (stripe % raid_disks); - if (*pd_idx == raid_disks-1) - (*dd_idx)++; /* Q D D D P */ - else if (*dd_idx >= *pd_idx) + pd_idx = raid_disks - 1 - (stripe % raid_disks); + qd_idx = pd_idx + 1; + if (pd_idx == raid_disks-1) { + (*dd_idx)++; /* Q D D D P */ + qd_idx = 0; + } else if (*dd_idx >= pd_idx) (*dd_idx) += 2; /* D D P Q D */ break; case ALGORITHM_RIGHT_ASYMMETRIC: - *pd_idx = stripe % raid_disks; - if (*pd_idx == raid_disks-1) - (*dd_idx)++; /* Q D D D P */ - else if (*dd_idx >= *pd_idx) + pd_idx = stripe % raid_disks; + qd_idx = pd_idx + 1; + if (pd_idx == raid_disks-1) { + (*dd_idx)++; /* Q D D D P */ + qd_idx = 0; + } else if (*dd_idx >= pd_idx) (*dd_idx) += 2; /* D D P Q D */ break; case ALGORITHM_LEFT_SYMMETRIC: - *pd_idx = raid_disks - 1 - (stripe % raid_disks); - *dd_idx = (*pd_idx + 2 + *dd_idx) % raid_disks; + pd_idx = raid_disks - 1 - (stripe % raid_disks); + qd_idx = (pd_idx + 1) % raid_disks; + *dd_idx = (pd_idx + 2 + *dd_idx) % raid_disks; break; case ALGORITHM_RIGHT_SYMMETRIC: - *pd_idx = stripe % raid_disks; - *dd_idx = (*pd_idx + 2 + *dd_idx) % raid_disks; + pd_idx = stripe % raid_disks; + qd_idx = (pd_idx + 1) % raid_disks; + *dd_idx = (pd_idx + 2 + *dd_idx) % raid_disks; + break; + + case ALGORITHM_PARITY_0: + pd_idx = 0; + qd_idx = 1; + (*dd_idx) += 2; + break; + case ALGORITHM_PARITY_N: + pd_idx = data_disks; + qd_idx = data_disks + 1; break; + + case ALGORITHM_ROTATING_ZERO_RESTART: + /* Exactly the same as RIGHT_ASYMMETRIC, but or + * of blocks for computing Q is different. + */ + pd_idx = stripe % raid_disks; + qd_idx = pd_idx + 1; + if (pd_idx == raid_disks-1) { + (*dd_idx)++; /* Q D D D P */ + qd_idx = 0; + } else if (*dd_idx >= pd_idx) + (*dd_idx) += 2; /* D D P Q D */ + ddf_layout = 1; + break; + + case ALGORITHM_ROTATING_N_RESTART: + /* Same a left_asymmetric, by first stripe is + * D D D P Q rather than + * Q D D D P + */ + pd_idx = raid_disks - 1 - ((stripe + 1) % raid_disks); + qd_idx = pd_idx + 1; + if (pd_idx == raid_disks-1) { + (*dd_idx)++; /* Q D D D P */ + qd_idx = 0; + } else if (*dd_idx >= pd_idx) + (*dd_idx) += 2; /* D D P Q D */ + ddf_layout = 1; + break; + + case ALGORITHM_ROTATING_N_CONTINUE: + /* Same as left_symmetric but Q is before P */ + pd_idx = raid_disks - 1 - (stripe % raid_disks); + qd_idx = (pd_idx + raid_disks - 1) % raid_disks; + *dd_idx = (pd_idx + 1 + *dd_idx) % raid_disks; + ddf_layout = 1; + break; + + case ALGORITHM_LEFT_ASYMMETRIC_6: + /* RAID5 left_asymmetric, with Q on last device */ + pd_idx = data_disks - stripe % (raid_disks-1); + if (*dd_idx >= pd_idx) + (*dd_idx)++; + qd_idx = raid_disks - 1; + break; + + case ALGORITHM_RIGHT_ASYMMETRIC_6: + pd_idx = stripe % (raid_disks-1); + if (*dd_idx >= pd_idx) + (*dd_idx)++; + qd_idx = raid_disks - 1; + break; + + case ALGORITHM_LEFT_SYMMETRIC_6: + pd_idx = data_disks - stripe % (raid_disks-1); + *dd_idx = (pd_idx + 1 + *dd_idx) % (raid_disks-1); + qd_idx = raid_disks - 1; + break; + + case ALGORITHM_RIGHT_SYMMETRIC_6: + pd_idx = stripe % (raid_disks-1); + *dd_idx = (pd_idx + 1 + *dd_idx) % (raid_disks-1); + qd_idx = raid_disks - 1; + break; + + case ALGORITHM_PARITY_0_6: + pd_idx = 0; + (*dd_idx)++; + qd_idx = raid_disks - 1; + break; + + default: printk(KERN_CRIT "raid6: unsupported algorithm %d\n", - conf->algorithm); + algorithm); + BUG(); } break; } + if (sh) { + sh->pd_idx = pd_idx; + sh->qd_idx = qd_idx; + sh->ddf_layout = ddf_layout; + } /* * Finally, compute the new sector number */ @@ -1329,17 +1474,21 @@ static sector_t raid5_compute_sector(sector_t r_sector, unsigned int raid_disks, } -static sector_t compute_blocknr(struct stripe_head *sh, int i) +static sector_t compute_blocknr(struct stripe_head *sh, int i, int previous) { raid5_conf_t *conf = sh->raid_conf; int raid_disks = sh->disks; int data_disks = raid_disks - conf->max_degraded; sector_t new_sector = sh->sector, check; - int sectors_per_chunk = conf->chunk_size >> 9; + int sectors_per_chunk = previous ? (conf->prev_chunk >> 9) + : (conf->chunk_size >> 9); + int algorithm = previous ? conf->prev_algo + : conf->algorithm; sector_t stripe; int chunk_offset; - int chunk_number, dummy1, dummy2, dd_idx = i; + int chunk_number, dummy1, dd_idx = i; sector_t r_sector; + struct stripe_head sh2; chunk_offset = sector_div(new_sector, sectors_per_chunk); @@ -1351,7 +1500,7 @@ static sector_t compute_blocknr(struct stripe_head *sh, int i) switch(conf->level) { case 4: break; case 5: - switch (conf->algorithm) { + switch (algorithm) { case ALGORITHM_LEFT_ASYMMETRIC: case ALGORITHM_RIGHT_ASYMMETRIC: if (i > sh->pd_idx) @@ -1363,19 +1512,27 @@ static sector_t compute_blocknr(struct stripe_head *sh, int i) i += raid_disks; i -= (sh->pd_idx + 1); break; + case ALGORITHM_PARITY_0: + i -= 1; + break; + case ALGORITHM_PARITY_N: + break; default: printk(KERN_ERR "raid5: unsupported algorithm %d\n", - conf->algorithm); + algorithm); + BUG(); } break; case 6: - if (i == raid6_next_disk(sh->pd_idx, raid_disks)) + if (i == sh->qd_idx) return 0; /* It is the Q disk */ - switch (conf->algorithm) { + switch (algorithm) { case ALGORITHM_LEFT_ASYMMETRIC: case ALGORITHM_RIGHT_ASYMMETRIC: - if (sh->pd_idx == raid_disks-1) - i--; /* Q D D D P */ + case ALGORITHM_ROTATING_ZERO_RESTART: + case ALGORITHM_ROTATING_N_RESTART: + if (sh->pd_idx == raid_disks-1) + i--; /* Q D D D P */ else if (i > sh->pd_idx) i -= 2; /* D D P Q D */ break; @@ -1390,9 +1547,35 @@ static sector_t compute_blocknr(struct stripe_head *sh, int i) i -= (sh->pd_idx + 2); } break; + case ALGORITHM_PARITY_0: + i -= 2; + break; + case ALGORITHM_PARITY_N: + break; + case ALGORITHM_ROTATING_N_CONTINUE: + if (sh->pd_idx == 0) + i--; /* P D D D Q */ + else if (i > sh->pd_idx) + i -= 2; /* D D Q P D */ + break; + case ALGORITHM_LEFT_ASYMMETRIC_6: + case ALGORITHM_RIGHT_ASYMMETRIC_6: + if (i > sh->pd_idx) + i--; + break; + case ALGORITHM_LEFT_SYMMETRIC_6: + case ALGORITHM_RIGHT_SYMMETRIC_6: + if (i < sh->pd_idx) + i += data_disks + 1; + i -= (sh->pd_idx + 1); + break; + case ALGORITHM_PARITY_0_6: + i -= 1; + break; default: printk(KERN_CRIT "raid6: unsupported algorithm %d\n", - conf->algorithm); + algorithm); + BUG(); } break; } @@ -1400,8 +1583,10 @@ static sector_t compute_blocknr(struct stripe_head *sh, int i) chunk_number = stripe * data_disks + i; r_sector = (sector_t)chunk_number * sectors_per_chunk + chunk_offset; - check = raid5_compute_sector(r_sector, raid_disks, data_disks, &dummy1, &dummy2, conf); - if (check != sh->sector || dummy1 != dd_idx || dummy2 != sh->pd_idx) { + check = raid5_compute_sector(conf, r_sector, + previous, &dummy1, &sh2); + if (check != sh->sector || dummy1 != dd_idx || sh2.pd_idx != sh->pd_idx + || sh2.qd_idx != sh->qd_idx) { printk(KERN_ERR "compute_blocknr: map not correct\n"); return 0; } @@ -1468,14 +1653,16 @@ static void copy_data(int frombio, struct bio *bio, static void compute_parity6(struct stripe_head *sh, int method) { - raid6_conf_t *conf = sh->raid_conf; - int i, pd_idx = sh->pd_idx, qd_idx, d0_idx, disks = sh->disks, count; + raid5_conf_t *conf = sh->raid_conf; + int i, pd_idx, qd_idx, d0_idx, disks = sh->disks, count; + int syndrome_disks = sh->ddf_layout ? disks : (disks - 2); struct bio *chosen; /**** FIX THIS: This could be very bad if disks is close to 256 ****/ - void *ptrs[disks]; + void *ptrs[syndrome_disks+2]; - qd_idx = raid6_next_disk(pd_idx, disks); - d0_idx = raid6_next_disk(qd_idx, disks); + pd_idx = sh->pd_idx; + qd_idx = sh->qd_idx; + d0_idx = raid6_d0(sh); pr_debug("compute_parity, stripe %llu, method %d\n", (unsigned long long)sh->sector, method); @@ -1513,24 +1700,29 @@ static void compute_parity6(struct stripe_head *sh, int method) set_bit(R5_UPTODATE, &sh->dev[i].flags); } -// switch(method) { -// case RECONSTRUCT_WRITE: -// case CHECK_PARITY: -// case UPDATE_PARITY: - /* Note that unlike RAID-5, the ordering of the disks matters greatly. */ - /* FIX: Is this ordering of drives even remotely optimal? */ - count = 0; - i = d0_idx; - do { - ptrs[count++] = page_address(sh->dev[i].page); - if (count <= disks-2 && !test_bit(R5_UPTODATE, &sh->dev[i].flags)) - printk("block %d/%d not uptodate on parity calc\n", i,count); - i = raid6_next_disk(i, disks); - } while ( i != d0_idx ); -// break; -// } - - raid6_call.gen_syndrome(disks, STRIPE_SIZE, ptrs); + /* Note that unlike RAID-5, the ordering of the disks matters greatly.*/ + + for (i = 0; i < disks; i++) + ptrs[i] = (void *)raid6_empty_zero_page; + + count = 0; + i = d0_idx; + do { + int slot = raid6_idx_to_slot(i, sh, &count, syndrome_disks); + + ptrs[slot] = page_address(sh->dev[i].page); + if (slot < syndrome_disks && + !test_bit(R5_UPTODATE, &sh->dev[i].flags)) { + printk(KERN_ERR "block %d/%d not uptodate " + "on parity calc\n", i, count); + BUG(); + } + + i = raid6_next_disk(i, disks); + } while (i != d0_idx); + BUG_ON(count != syndrome_disks); + + raid6_call.gen_syndrome(syndrome_disks+2, STRIPE_SIZE, ptrs); switch(method) { case RECONSTRUCT_WRITE: @@ -1552,8 +1744,7 @@ static void compute_block_1(struct stripe_head *sh, int dd_idx, int nozero) { int i, count, disks = sh->disks; void *ptr[MAX_XOR_BLOCKS], *dest, *p; - int pd_idx = sh->pd_idx; - int qd_idx = raid6_next_disk(pd_idx, disks); + int qd_idx = sh->qd_idx; pr_debug("compute_block_1, stripe %llu, idx %d\n", (unsigned long long)sh->sector, dd_idx); @@ -1589,63 +1780,65 @@ static void compute_block_1(struct stripe_head *sh, int dd_idx, int nozero) static void compute_block_2(struct stripe_head *sh, int dd_idx1, int dd_idx2) { int i, count, disks = sh->disks; - int pd_idx = sh->pd_idx; - int qd_idx = raid6_next_disk(pd_idx, disks); - int d0_idx = raid6_next_disk(qd_idx, disks); - int faila, failb; + int syndrome_disks = sh->ddf_layout ? disks : disks-2; + int d0_idx = raid6_d0(sh); + int faila = -1, failb = -1; + /**** FIX THIS: This could be very bad if disks is close to 256 ****/ + void *ptrs[syndrome_disks+2]; - /* faila and failb are disk numbers relative to d0_idx */ - /* pd_idx become disks-2 and qd_idx become disks-1 */ - faila = (dd_idx1 < d0_idx) ? dd_idx1+(disks-d0_idx) : dd_idx1-d0_idx; - failb = (dd_idx2 < d0_idx) ? dd_idx2+(disks-d0_idx) : dd_idx2-d0_idx; + for (i = 0; i < disks ; i++) + ptrs[i] = (void *)raid6_empty_zero_page; + count = 0; + i = d0_idx; + do { + int slot = raid6_idx_to_slot(i, sh, &count, syndrome_disks); + + ptrs[slot] = page_address(sh->dev[i].page); + + if (i == dd_idx1) + faila = slot; + if (i == dd_idx2) + failb = slot; + i = raid6_next_disk(i, disks); + } while (i != d0_idx); + BUG_ON(count != syndrome_disks); BUG_ON(faila == failb); if ( failb < faila ) { int tmp = faila; faila = failb; failb = tmp; } pr_debug("compute_block_2, stripe %llu, idx %d,%d (%d,%d)\n", - (unsigned long long)sh->sector, dd_idx1, dd_idx2, faila, failb); + (unsigned long long)sh->sector, dd_idx1, dd_idx2, + faila, failb); - if ( failb == disks-1 ) { + if (failb == syndrome_disks+1) { /* Q disk is one of the missing disks */ - if ( faila == disks-2 ) { + if (faila == syndrome_disks) { /* Missing P+Q, just recompute */ compute_parity6(sh, UPDATE_PARITY); return; } else { /* We're missing D+Q; recompute D from P */ - compute_block_1(sh, (dd_idx1 == qd_idx) ? dd_idx2 : dd_idx1, 0); + compute_block_1(sh, ((dd_idx1 == sh->qd_idx) ? + dd_idx2 : dd_idx1), + 0); compute_parity6(sh, UPDATE_PARITY); /* Is this necessary? */ return; } } - /* We're missing D+P or D+D; build pointer table */ - { - /**** FIX THIS: This could be very bad if disks is close to 256 ****/ - void *ptrs[disks]; - - count = 0; - i = d0_idx; - do { - ptrs[count++] = page_address(sh->dev[i].page); - i = raid6_next_disk(i, disks); - if (i != dd_idx1 && i != dd_idx2 && - !test_bit(R5_UPTODATE, &sh->dev[i].flags)) - printk("compute_2 with missing block %d/%d\n", count, i); - } while ( i != d0_idx ); - - if ( failb == disks-2 ) { - /* We're missing D+P. */ - raid6_datap_recov(disks, STRIPE_SIZE, faila, ptrs); - } else { - /* We're missing D+D. */ - raid6_2data_recov(disks, STRIPE_SIZE, faila, failb, ptrs); - } - - /* Both the above update both missing blocks */ - set_bit(R5_UPTODATE, &sh->dev[dd_idx1].flags); - set_bit(R5_UPTODATE, &sh->dev[dd_idx2].flags); + /* We're missing D+P or D+D; */ + if (failb == syndrome_disks) { + /* We're missing D+P. */ + raid6_datap_recov(syndrome_disks+2, STRIPE_SIZE, faila, ptrs); + } else { + /* We're missing D+D. */ + raid6_2data_recov(syndrome_disks+2, STRIPE_SIZE, faila, failb, + ptrs); } + + /* Both the above update both missing blocks */ + set_bit(R5_UPTODATE, &sh->dev[dd_idx1].flags); + set_bit(R5_UPTODATE, &sh->dev[dd_idx2].flags); } static void @@ -1800,17 +1993,21 @@ static int page_is_zero(struct page *p) memcmp(a, a+4, STRIPE_SIZE-4)==0); } -static int stripe_to_pdidx(sector_t stripe, raid5_conf_t *conf, int disks) +static void stripe_set_idx(sector_t stripe, raid5_conf_t *conf, int previous, + struct stripe_head *sh) { - int sectors_per_chunk = conf->chunk_size >> 9; - int pd_idx, dd_idx; + int sectors_per_chunk = + previous ? (conf->prev_chunk >> 9) + : (conf->chunk_size >> 9); + int dd_idx; int chunk_offset = sector_div(stripe, sectors_per_chunk); + int disks = previous ? conf->previous_raid_disks : conf->raid_disks; - raid5_compute_sector(stripe * (disks - conf->max_degraded) + raid5_compute_sector(conf, + stripe * (disks - conf->max_degraded) *sectors_per_chunk + chunk_offset, - disks, disks - conf->max_degraded, - &dd_idx, &pd_idx, conf); - return pd_idx; + previous, + &dd_idx, sh); } static void @@ -2181,7 +2378,7 @@ static void handle_stripe_dirtying6(raid5_conf_t *conf, struct r6_state *r6s, int disks) { int rcw = 0, must_compute = 0, pd_idx = sh->pd_idx, i; - int qd_idx = r6s->qd_idx; + int qd_idx = sh->qd_idx; for (i = disks; i--; ) { struct r5dev *dev = &sh->dev[i]; /* Would I have to read this buffer for reconstruct_write */ @@ -2371,7 +2568,7 @@ static void handle_parity_checks6(raid5_conf_t *conf, struct stripe_head *sh, int update_p = 0, update_q = 0; struct r5dev *dev; int pd_idx = sh->pd_idx; - int qd_idx = r6s->qd_idx; + int qd_idx = sh->qd_idx; set_bit(STRIPE_HANDLE, &sh->state); @@ -2467,17 +2664,14 @@ static void handle_stripe_expansion(raid5_conf_t *conf, struct stripe_head *sh, struct dma_async_tx_descriptor *tx = NULL; clear_bit(STRIPE_EXPAND_SOURCE, &sh->state); for (i = 0; i < sh->disks; i++) - if (i != sh->pd_idx && (!r6s || i != r6s->qd_idx)) { - int dd_idx, pd_idx, j; + if (i != sh->pd_idx && i != sh->qd_idx) { + int dd_idx, j; struct stripe_head *sh2; - sector_t bn = compute_blocknr(sh, i); - sector_t s = raid5_compute_sector(bn, conf->raid_disks, - conf->raid_disks - - conf->max_degraded, &dd_idx, - &pd_idx, conf); - sh2 = get_active_stripe(conf, s, conf->raid_disks, - pd_idx, 1); + sector_t bn = 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); if (sh2 == NULL) /* so far only the early blocks of this stripe * have been requested. When later blocks @@ -2500,8 +2694,7 @@ static void handle_stripe_expansion(raid5_conf_t *conf, struct stripe_head *sh, set_bit(R5_UPTODATE, &sh2->dev[dd_idx].flags); for (j = 0; j < conf->raid_disks; j++) if (j != sh2->pd_idx && - (!r6s || j != raid6_next_disk(sh2->pd_idx, - sh2->disks)) && + (!r6s || j != sh2->qd_idx) && !test_bit(R5_Expanded, &sh2->dev[j].flags)) break; if (j == conf->raid_disks) { @@ -2750,6 +2943,23 @@ static bool handle_stripe5(struct stripe_head *sh) /* Finish reconstruct operations initiated by the expansion process */ if (sh->reconstruct_state == reconstruct_state_result) { + struct stripe_head *sh2 + = get_active_stripe(conf, sh->sector, 1, 1); + if (sh2 && test_bit(STRIPE_EXPAND_SOURCE, &sh2->state)) { + /* sh cannot be written until sh2 has been read. + * so arrange for sh to be delayed a little + */ + set_bit(STRIPE_DELAYED, &sh->state); + set_bit(STRIPE_HANDLE, &sh->state); + if (!test_and_set_bit(STRIPE_PREREAD_ACTIVE, + &sh2->state)) + atomic_inc(&conf->preread_active_stripes); + release_stripe(sh2); + goto unlock; + } + if (sh2) + release_stripe(sh2); + sh->reconstruct_state = reconstruct_state_idle; clear_bit(STRIPE_EXPANDING, &sh->state); for (i = conf->raid_disks; i--; ) { @@ -2763,8 +2973,7 @@ static bool handle_stripe5(struct stripe_head *sh) !sh->reconstruct_state) { /* Need to write out all blocks after computing parity */ sh->disks = conf->raid_disks; - sh->pd_idx = stripe_to_pdidx(sh->sector, conf, - conf->raid_disks); + stripe_set_idx(sh->sector, conf, 0, sh); schedule_reconstruction5(sh, &s, 1, 1); } else if (s.expanded && !sh->reconstruct_state && s.locked == 0) { clear_bit(STRIPE_EXPAND_READY, &sh->state); @@ -2796,20 +3005,19 @@ static bool handle_stripe5(struct stripe_head *sh) static bool handle_stripe6(struct stripe_head *sh, struct page *tmp_page) { - raid6_conf_t *conf = sh->raid_conf; + raid5_conf_t *conf = sh->raid_conf; int disks = sh->disks; struct bio *return_bi = NULL; - int i, pd_idx = sh->pd_idx; + int i, pd_idx = sh->pd_idx, qd_idx = sh->qd_idx; struct stripe_head_state s; struct r6_state r6s; struct r5dev *dev, *pdev, *qdev; mdk_rdev_t *blocked_rdev = NULL; - r6s.qd_idx = raid6_next_disk(pd_idx, disks); pr_debug("handling stripe %llu, state=%#lx cnt=%d, " "pd_idx=%d, qd_idx=%d\n", (unsigned long long)sh->sector, sh->state, - atomic_read(&sh->count), pd_idx, r6s.qd_idx); + atomic_read(&sh->count), pd_idx, qd_idx); memset(&s, 0, sizeof(s)); spin_lock(&sh->lock); @@ -2920,9 +3128,9 @@ static bool handle_stripe6(struct stripe_head *sh, struct page *tmp_page) pdev = &sh->dev[pd_idx]; r6s.p_failed = (s.failed >= 1 && r6s.failed_num[0] == pd_idx) || (s.failed >= 2 && r6s.failed_num[1] == pd_idx); - qdev = &sh->dev[r6s.qd_idx]; - r6s.q_failed = (s.failed >= 1 && r6s.failed_num[0] == r6s.qd_idx) - || (s.failed >= 2 && r6s.failed_num[1] == r6s.qd_idx); + qdev = &sh->dev[qd_idx]; + r6s.q_failed = (s.failed >= 1 && r6s.failed_num[0] == qd_idx) + || (s.failed >= 2 && r6s.failed_num[1] == qd_idx); if ( s.written && ( r6s.p_failed || ((test_bit(R5_Insync, &pdev->flags) @@ -2980,10 +3188,26 @@ static bool handle_stripe6(struct stripe_head *sh, struct page *tmp_page) } if (s.expanded && test_bit(STRIPE_EXPANDING, &sh->state)) { + struct stripe_head *sh2 + = get_active_stripe(conf, sh->sector, 1, 1); + if (sh2 && test_bit(STRIPE_EXPAND_SOURCE, &sh2->state)) { + /* sh cannot be written until sh2 has been read. + * so arrange for sh to be delayed a little + */ + set_bit(STRIPE_DELAYED, &sh->state); + set_bit(STRIPE_HANDLE, &sh->state); + if (!test_and_set_bit(STRIPE_PREREAD_ACTIVE, + &sh2->state)) + atomic_inc(&conf->preread_active_stripes); + release_stripe(sh2); + goto unlock; + } + if (sh2) + release_stripe(sh2); + /* Need to write out all blocks after computing P&Q */ sh->disks = conf->raid_disks; - sh->pd_idx = stripe_to_pdidx(sh->sector, conf, - conf->raid_disks); + stripe_set_idx(sh->sector, conf, 0, sh); compute_parity6(sh, RECONSTRUCT_WRITE); for (i = conf->raid_disks ; i-- ; ) { set_bit(R5_LOCKED, &sh->dev[i].flags); @@ -3134,6 +3358,8 @@ static int raid5_mergeable_bvec(struct request_queue *q, if ((bvm->bi_rw & 1) == WRITE) return biovec->bv_len; /* always allow writes to be mergeable */ + if (mddev->new_chunk < mddev->chunk_size) + chunk_sectors = mddev->new_chunk >> 9; max = (chunk_sectors - ((sector & (chunk_sectors - 1)) + bio_sectors)) << 9; if (max < 0) max = 0; if (max <= biovec->bv_len && bio_sectors == 0) @@ -3149,6 +3375,8 @@ static int in_chunk_boundary(mddev_t *mddev, struct bio *bio) unsigned int chunk_sectors = mddev->chunk_size >> 9; unsigned int bio_sectors = bio->bi_size >> 9; + if (mddev->new_chunk < mddev->chunk_size) + chunk_sectors = mddev->new_chunk >> 9; return chunk_sectors >= ((sector & (chunk_sectors - 1)) + bio_sectors); } @@ -3255,9 +3483,7 @@ static int chunk_aligned_read(struct request_queue *q, struct bio * raid_bio) { mddev_t *mddev = q->queuedata; raid5_conf_t *conf = mddev_to_conf(mddev); - const unsigned int raid_disks = conf->raid_disks; - const unsigned int data_disks = raid_disks - conf->max_degraded; - unsigned int dd_idx, pd_idx; + unsigned int dd_idx; struct bio* align_bi; mdk_rdev_t *rdev; @@ -3266,7 +3492,7 @@ static int chunk_aligned_read(struct request_queue *q, struct bio * raid_bio) return 0; } /* - * use bio_clone to make a copy of the bio + * use bio_clone to make a copy of the bio */ align_bi = bio_clone(raid_bio, GFP_NOIO); if (!align_bi) @@ -3280,12 +3506,9 @@ static int chunk_aligned_read(struct request_queue *q, struct bio * raid_bio) /* * compute position */ - align_bi->bi_sector = raid5_compute_sector(raid_bio->bi_sector, - raid_disks, - data_disks, - &dd_idx, - &pd_idx, - conf); + align_bi->bi_sector = raid5_compute_sector(conf, raid_bio->bi_sector, + 0, + &dd_idx, NULL); rcu_read_lock(); rdev = rcu_dereference(conf->disks[dd_idx].rdev); @@ -3377,7 +3600,7 @@ static int make_request(struct request_queue *q, struct bio * bi) { mddev_t *mddev = q->queuedata; raid5_conf_t *conf = mddev_to_conf(mddev); - unsigned int dd_idx, pd_idx; + int dd_idx; sector_t new_sector; sector_t logical_sector, last_sector; struct stripe_head *sh; @@ -3400,7 +3623,7 @@ static int make_request(struct request_queue *q, struct bio * bi) if (rw == READ && mddev->reshape_position == MaxSector && chunk_aligned_read(q,bi)) - return 0; + return 0; logical_sector = bi->bi_sector & ~((sector_t)STRIPE_SECTORS-1); last_sector = bi->bi_sector + (bi->bi_size>>9); @@ -3410,26 +3633,31 @@ static int make_request(struct request_queue *q, struct bio * bi) for (;logical_sector < last_sector; logical_sector += STRIPE_SECTORS) { DEFINE_WAIT(w); int disks, data_disks; + int previous; retry: + previous = 0; + disks = conf->raid_disks; prepare_to_wait(&conf->wait_for_overlap, &w, TASK_UNINTERRUPTIBLE); - if (likely(conf->expand_progress == MaxSector)) - disks = conf->raid_disks; - else { - /* spinlock is needed as expand_progress may be + if (unlikely(conf->reshape_progress != MaxSector)) { + /* spinlock is needed as reshape_progress may be * 64bit on a 32bit platform, and so it might be * possible to see a half-updated value - * Ofcourse expand_progress could change after + * Ofcourse reshape_progress could change after * the lock is dropped, so once we get a reference * to the stripe that we think it is, we will have * to check again. */ spin_lock_irq(&conf->device_lock); - disks = conf->raid_disks; - if (logical_sector >= conf->expand_progress) + if (mddev->delta_disks < 0 + ? logical_sector < conf->reshape_progress + : logical_sector >= conf->reshape_progress) { disks = conf->previous_raid_disks; - else { - if (logical_sector >= conf->expand_lo) { + previous = 1; + } else { + if (mddev->delta_disks < 0 + ? logical_sector < conf->reshape_safe + : logical_sector >= conf->reshape_safe) { spin_unlock_irq(&conf->device_lock); schedule(); goto retry; @@ -3439,15 +3667,17 @@ static int make_request(struct request_queue *q, struct bio * bi) } data_disks = disks - conf->max_degraded; - new_sector = raid5_compute_sector(logical_sector, disks, data_disks, - &dd_idx, &pd_idx, conf); + new_sector = raid5_compute_sector(conf, logical_sector, + previous, + &dd_idx, NULL); pr_debug("raid5: make_request, sector %llu logical %llu\n", (unsigned long long)new_sector, (unsigned long long)logical_sector); - sh = get_active_stripe(conf, new_sector, disks, pd_idx, (bi->bi_rw&RWA_MASK)); + sh = get_active_stripe(conf, new_sector, previous, + (bi->bi_rw&RWA_MASK)); if (sh) { - if (unlikely(conf->expand_progress != MaxSector)) { + if (unlikely(previous)) { /* expansion might have moved on while waiting for a * stripe, so we must do the range check again. * Expansion could still move past after this @@ -3458,8 +3688,9 @@ static int make_request(struct request_queue *q, struct bio * bi) */ int must_retry = 0; spin_lock_irq(&conf->device_lock); - if (logical_sector < conf->expand_progress && - disks == conf->previous_raid_disks) + if (mddev->delta_disks < 0 + ? logical_sector >= conf->reshape_progress + : logical_sector < conf->reshape_progress) /* mismatch, need to try again */ must_retry = 1; spin_unlock_irq(&conf->device_lock); @@ -3514,6 +3745,8 @@ static int make_request(struct request_queue *q, struct bio * bi) return 0; } +static sector_t raid5_size(mddev_t *mddev, sector_t sectors, int raid_disks); + static sector_t reshape_request(mddev_t *mddev, sector_t sector_nr, int *skipped) { /* reshaping is quite different to recovery/resync so it is @@ -3527,61 +3760,118 @@ static sector_t reshape_request(mddev_t *mddev, sector_t sector_nr, int *skipped */ raid5_conf_t *conf = (raid5_conf_t *) mddev->private; struct stripe_head *sh; - int pd_idx; sector_t first_sector, last_sector; int raid_disks = conf->previous_raid_disks; int data_disks = raid_disks - conf->max_degraded; int new_data_disks = conf->raid_disks - conf->max_degraded; int i; int dd_idx; - sector_t writepos, safepos, gap; - - if (sector_nr == 0 && - conf->expand_progress != 0) { - /* restarting in the middle, skip the initial sectors */ - sector_nr = conf->expand_progress; + sector_t writepos, readpos, safepos; + sector_t stripe_addr; + int reshape_sectors; + struct list_head stripes; + + if (sector_nr == 0) { + /* If restarting in the middle, skip the initial sectors */ + if (mddev->delta_disks < 0 && + conf->reshape_progress < raid5_size(mddev, 0, 0)) { + sector_nr = raid5_size(mddev, 0, 0) + - conf->reshape_progress; + } else if (mddev->delta_disks > 0 && + conf->reshape_progress > 0) + sector_nr = conf->reshape_progress; sector_div(sector_nr, new_data_disks); - *skipped = 1; - return sector_nr; + if (sector_nr) { + *skipped = 1; + return sector_nr; + } } + /* We need to process a full chunk at a time. + * If old and new chunk sizes differ, we need to process the + * largest of these + */ + if (mddev->new_chunk > mddev->chunk_size) + reshape_sectors = mddev->new_chunk / 512; + else + reshape_sectors = mddev->chunk_size / 512; + /* we update the metadata when there is more than 3Meg * in the block range (that is rather arbitrary, should * probably be time based) or when the data about to be * copied would over-write the source of the data at * the front of the range. - * i.e. one new_stripe forward from expand_progress new_maps - * to after where expand_lo old_maps to + * i.e. one new_stripe along from reshape_progress new_maps + * to after where reshape_safe old_maps to */ - writepos = conf->expand_progress + - conf->chunk_size/512*(new_data_disks); + writepos = conf->reshape_progress; sector_div(writepos, new_data_disks); - safepos = conf->expand_lo; + readpos = conf->reshape_progress; + sector_div(readpos, data_disks); + safepos = conf->reshape_safe; sector_div(safepos, data_disks); - gap = conf->expand_progress - conf->expand_lo; + if (mddev->delta_disks < 0) { + writepos -= reshape_sectors; + readpos += reshape_sectors; + safepos += reshape_sectors; + } else { + writepos += reshape_sectors; + readpos -= reshape_sectors; + safepos -= reshape_sectors; + } - if (writepos >= safepos || - gap > (new_data_disks)*3000*2 /*3Meg*/) { + /* 'writepos' is the most advanced device address we might write. + * 'readpos' is the least advanced device address we might read. + * 'safepos' is the least address recorded in the metadata as having + * been reshaped. + * If 'readpos' is behind 'writepos', then there is no way that we can + * ensure safety in the face of a crash - that must be done by userspace + * making a backup of the data. So in that case there is no particular + * rush to update metadata. + * Otherwise if 'safepos' is behind 'writepos', then we really need to + * update the metadata to advance 'safepos' to match 'readpos' so that + * we can be safe in the event of a crash. + * So we insist on updating metadata if safepos is behind writepos and + * readpos is beyond writepos. + * In any case, update the metadata every 10 seconds. + * Maybe that number should be configurable, but I'm not sure it is + * worth it.... maybe it could be a multiple of safemode_delay??? + */ + if ((mddev->delta_disks < 0 + ? (safepos > writepos && readpos < writepos) + : (safepos < writepos && readpos > writepos)) || + time_after(jiffies, conf->reshape_checkpoint + 10*HZ)) { /* Cannot proceed until we've updated the superblock... */ wait_event(conf->wait_for_overlap, atomic_read(&conf->reshape_stripes)==0); - mddev->reshape_position = conf->expand_progress; + mddev->reshape_position = conf->reshape_progress; + conf->reshape_checkpoint = jiffies; set_bit(MD_CHANGE_DEVS, &mddev->flags); md_wakeup_thread(mddev->thread); wait_event(mddev->sb_wait, mddev->flags == 0 || kthread_should_stop()); spin_lock_irq(&conf->device_lock); - conf->expand_lo = mddev->reshape_position; + conf->reshape_safe = mddev->reshape_position; spin_unlock_irq(&conf->device_lock); wake_up(&conf->wait_for_overlap); } - for (i=0; i < conf->chunk_size/512; i+= STRIPE_SECTORS) { + if (mddev->delta_disks < 0) { + BUG_ON(conf->reshape_progress == 0); + stripe_addr = writepos; + BUG_ON((mddev->dev_sectors & + ~((sector_t)reshape_sectors - 1)) + - reshape_sectors - stripe_addr + != sector_nr); + } else { + BUG_ON(writepos != sector_nr + reshape_sectors); + stripe_addr = sector_nr; + } + INIT_LIST_HEAD(&stripes); + for (i = 0; i < reshape_sectors; i += STRIPE_SECTORS) { int j; int skipped = 0; - pd_idx = stripe_to_pdidx(sector_nr+i, conf, conf->raid_disks); - sh = get_active_stripe(conf, sector_nr+i, - conf->raid_disks, pd_idx, 0); + sh = get_active_stripe(conf, stripe_addr+i, 0, 0); set_bit(STRIPE_EXPANDING, &sh->state); atomic_inc(&conf->reshape_stripes); /* If any of this stripe is beyond the end of the old @@ -3592,10 +3882,10 @@ static sector_t reshape_request(mddev_t *mddev, sector_t sector_nr, int *skipped if (j == sh->pd_idx) continue; if (conf->level == 6 && - j == raid6_next_disk(sh->pd_idx, sh->disks)) + j == sh->qd_idx) continue; - s = compute_blocknr(sh, j); - if (s < mddev->array_sectors) { + s = compute_blocknr(sh, j, 0); + if (s < raid5_size(mddev, 0, 0)) { skipped = 1; continue; } @@ -3607,10 +3897,13 @@ static sector_t reshape_request(mddev_t *mddev, sector_t sector_nr, int *skipped set_bit(STRIPE_EXPAND_READY, &sh->state); set_bit(STRIPE_HANDLE, &sh->state); } - release_stripe(sh); + list_add(&sh->lru, &stripes); } spin_lock_irq(&conf->device_lock); - conf->expand_progress = (sector_nr + i) * new_data_disks; + if (mddev->delta_disks < 0) + conf->reshape_progress -= reshape_sectors * new_data_disks; + else + conf->reshape_progress += reshape_sectors * new_data_disks; spin_unlock_irq(&conf->device_lock); /* Ok, those stripe are ready. We can start scheduling * reads on the source stripes. @@ -3618,46 +3911,50 @@ static sector_t reshape_request(mddev_t *mddev, sector_t sector_nr, int *skipped * block on the destination stripes. */ first_sector = - raid5_compute_sector(sector_nr*(new_data_disks), - raid_disks, data_disks, - &dd_idx, &pd_idx, conf); + raid5_compute_sector(conf, stripe_addr*(new_data_disks), + 1, &dd_idx, NULL); last_sector = - raid5_compute_sector((sector_nr+conf->chunk_size/512) - *(new_data_disks) -1, - raid_disks, data_disks, - &dd_idx, &pd_idx, conf); - if (last_sector >= (mddev->size<<1)) - last_sector = (mddev->size<<1)-1; + raid5_compute_sector(conf, ((stripe_addr+conf->chunk_size/512) + *(new_data_disks) - 1), + 1, &dd_idx, NULL); + if (last_sector >= mddev->dev_sectors) + last_sector = mddev->dev_sectors - 1; while (first_sector <= last_sector) { - pd_idx = stripe_to_pdidx(first_sector, conf, - conf->previous_raid_disks); - sh = get_active_stripe(conf, first_sector, - conf->previous_raid_disks, pd_idx, 0); + sh = get_active_stripe(conf, first_sector, 1, 0); set_bit(STRIPE_EXPAND_SOURCE, &sh->state); set_bit(STRIPE_HANDLE, &sh->state); release_stripe(sh); first_sector += STRIPE_SECTORS; } + /* Now that the sources are clearly marked, we can release + * the destination stripes + */ + while (!list_empty(&stripes)) { + sh = list_entry(stripes.next, struct stripe_head, lru); + list_del_init(&sh->lru); + 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. */ - sector_nr += conf->chunk_size>>9; + sector_nr += reshape_sectors; if (sector_nr >= mddev->resync_max) { /* Cannot proceed until we've updated the superblock... */ wait_event(conf->wait_for_overlap, atomic_read(&conf->reshape_stripes) == 0); - mddev->reshape_position = conf->expand_progress; + mddev->reshape_position = conf->reshape_progress; + conf->reshape_checkpoint = jiffies; set_bit(MD_CHANGE_DEVS, &mddev->flags); md_wakeup_thread(mddev->thread); wait_event(mddev->sb_wait, !test_bit(MD_CHANGE_DEVS, &mddev->flags) || kthread_should_stop()); spin_lock_irq(&conf->device_lock); - conf->expand_lo = mddev->reshape_position; + conf->reshape_safe = mddev->reshape_position; spin_unlock_irq(&conf->device_lock); wake_up(&conf->wait_for_overlap); } - return conf->chunk_size>>9; + return reshape_sectors; } /* FIXME go_faster isn't used */ @@ -3665,9 +3962,7 @@ static inline sector_t sync_request(mddev_t *mddev, sector_t sector_nr, int *ski { raid5_conf_t *conf = (raid5_conf_t *) mddev->private; struct stripe_head *sh; - int pd_idx; - int raid_disks = conf->raid_disks; - sector_t max_sector = mddev->size << 1; + sector_t max_sector = mddev->dev_sectors; int sync_blocks; int still_degraded = 0; int i; @@ -3675,6 +3970,7 @@ static inline sector_t sync_request(mddev_t *mddev, sector_t sector_nr, int *ski if (sector_nr >= max_sector) { /* just being told to finish up .. nothing much to do */ unplug_slaves(mddev); + if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) { end_reshape(conf); return 0; @@ -3705,7 +4001,7 @@ static inline sector_t sync_request(mddev_t *mddev, sector_t sector_nr, int *ski */ if (mddev->degraded >= conf->max_degraded && test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { - sector_t rv = (mddev->size << 1) - sector_nr; + sector_t rv = mddev->dev_sectors - sector_nr; *skipped = 1; return rv; } @@ -3721,10 +4017,9 @@ static inline sector_t sync_request(mddev_t *mddev, sector_t sector_nr, int *ski bitmap_cond_end_sync(mddev->bitmap, sector_nr); - pd_idx = stripe_to_pdidx(sector_nr, conf, raid_disks); - sh = get_active_stripe(conf, sector_nr, raid_disks, pd_idx, 1); + sh = get_active_stripe(conf, sector_nr, 0, 1); if (sh == NULL) { - sh = get_active_stripe(conf, sector_nr, raid_disks, pd_idx, 0); + sh = get_active_stripe(conf, sector_nr, 0, 0); /* make sure we don't swamp the stripe cache if someone else * is trying to get access */ @@ -3766,19 +4061,15 @@ static int retry_aligned_read(raid5_conf_t *conf, struct bio *raid_bio) * it will be only one 'dd_idx' and only need one call to raid5_compute_sector. */ struct stripe_head *sh; - int dd_idx, pd_idx; + int dd_idx; sector_t sector, logical_sector, last_sector; int scnt = 0; int remaining; int handled = 0; logical_sector = raid_bio->bi_sector & ~((sector_t)STRIPE_SECTORS-1); - sector = raid5_compute_sector( logical_sector, - conf->raid_disks, - conf->raid_disks - conf->max_degraded, - &dd_idx, - &pd_idx, - conf); + sector = raid5_compute_sector(conf, logical_sector, + 0, &dd_idx, NULL); last_sector = raid_bio->bi_sector + (raid_bio->bi_size>>9); for (; logical_sector < last_sector; @@ -3790,7 +4081,7 @@ static int retry_aligned_read(raid5_conf_t *conf, struct bio *raid_bio) /* already done this stripe */ continue; - sh = get_active_stripe(conf, sector, conf->raid_disks, pd_idx, 1); + sh = get_active_stripe(conf, sector, 0, 1); if (!sh) { /* failed to get a stripe - must wait */ @@ -3992,89 +4283,69 @@ static struct attribute_group raid5_attrs_group = { .attrs = raid5_attrs, }; -static int run(mddev_t *mddev) +static sector_t +raid5_size(mddev_t *mddev, sector_t sectors, int raid_disks) +{ + raid5_conf_t *conf = mddev_to_conf(mddev); + + if (!sectors) + sectors = mddev->dev_sectors; + if (!raid_disks) { + /* size is defined by the smallest of previous and new size */ + if (conf->raid_disks < conf->previous_raid_disks) + raid_disks = conf->raid_disks; + else + raid_disks = conf->previous_raid_disks; + } + + sectors &= ~((sector_t)mddev->chunk_size/512 - 1); + sectors &= ~((sector_t)mddev->new_chunk/512 - 1); + return sectors * (raid_disks - conf->max_degraded); +} + +static raid5_conf_t *setup_conf(mddev_t *mddev) { raid5_conf_t *conf; int raid_disk, memory; mdk_rdev_t *rdev; struct disk_info *disk; - int working_disks = 0; - if (mddev->level != 5 && mddev->level != 4 && mddev->level != 6) { + if (mddev->new_level != 5 + && mddev->new_level != 4 + && mddev->new_level != 6) { printk(KERN_ERR "raid5: %s: raid level not set to 4/5/6 (%d)\n", - mdname(mddev), mddev->level); - return -EIO; + mdname(mddev), mddev->new_level); + return ERR_PTR(-EIO); } - - if (mddev->chunk_size < PAGE_SIZE) { - printk(KERN_ERR "md/raid5: chunk_size must be at least " - "PAGE_SIZE but %d < %ld\n", - mddev->chunk_size, PAGE_SIZE); - return -EINVAL; + if ((mddev->new_level == 5 + && !algorithm_valid_raid5(mddev->new_layout)) || + (mddev->new_level == 6 + && !algorithm_valid_raid6(mddev->new_layout))) { + printk(KERN_ERR "raid5: %s: layout %d not supported\n", + mdname(mddev), mddev->new_layout); + return ERR_PTR(-EIO); } - - if (mddev->reshape_position != MaxSector) { - /* Check that we can continue the reshape. - * Currently only disks can change, it must - * increase, and we must be past the point where - * a stripe over-writes itself - */ - sector_t here_new, here_old; - int old_disks; - int max_degraded = (mddev->level == 5 ? 1 : 2); - - if (mddev->new_level != mddev->level || - mddev->new_layout != mddev->layout || - mddev->new_chunk != mddev->chunk_size) { - printk(KERN_ERR "raid5: %s: unsupported reshape " - "required - aborting.\n", - mdname(mddev)); - return -EINVAL; - } - if (mddev->delta_disks <= 0) { - printk(KERN_ERR "raid5: %s: unsupported reshape " - "(reduce disks) required - aborting.\n", - mdname(mddev)); - return -EINVAL; - } - old_disks = mddev->raid_disks - mddev->delta_disks; - /* reshape_position must be on a new-stripe boundary, and one - * further up in new geometry must map after here in old - * geometry. - */ - here_new = mddev->reshape_position; - if (sector_div(here_new, (mddev->chunk_size>>9)* - (mddev->raid_disks - max_degraded))) { - printk(KERN_ERR "raid5: reshape_position not " - "on a stripe boundary\n"); - return -EINVAL; - } - /* here_new is the stripe we will write to */ - here_old = mddev->reshape_position; - sector_div(here_old, (mddev->chunk_size>>9)* - (old_disks-max_degraded)); - /* here_old is the first stripe that we might need to read - * from */ - if (here_new >= here_old) { - /* Reading from the same stripe as writing to - bad */ - printk(KERN_ERR "raid5: reshape_position too early for " - "auto-recovery - aborting.\n"); - return -EINVAL; - } - printk(KERN_INFO "raid5: reshape will continue\n"); - /* OK, we should be able to continue; */ + if (mddev->new_level == 6 && mddev->raid_disks < 4) { + printk(KERN_ERR "raid6: not enough configured devices for %s (%d, minimum 4)\n", + mdname(mddev), mddev->raid_disks); + return ERR_PTR(-EINVAL); } + if (!mddev->new_chunk || mddev->new_chunk % PAGE_SIZE) { + printk(KERN_ERR "raid5: invalid chunk size %d for %s\n", + mddev->new_chunk, mdname(mddev)); + return ERR_PTR(-EINVAL); + } - mddev->private = kzalloc(sizeof (raid5_conf_t), GFP_KERNEL); - if ((conf = mddev->private) == NULL) + conf = kzalloc(sizeof(raid5_conf_t), GFP_KERNEL); + if (conf == NULL) goto abort; - if (mddev->reshape_position == MaxSector) { - conf->previous_raid_disks = conf->raid_disks = mddev->raid_disks; - } else { - conf->raid_disks = mddev->raid_disks; + + conf->raid_disks = mddev->raid_disks; + if (mddev->reshape_position == MaxSector) + conf->previous_raid_disks = mddev->raid_disks; + else conf->previous_raid_disks = mddev->raid_disks - mddev->delta_disks; - } conf->disks = kzalloc(conf->raid_disks * sizeof(struct disk_info), GFP_KERNEL); @@ -4086,13 +4357,12 @@ static int run(mddev_t *mddev) if ((conf->stripe_hashtbl = kzalloc(PAGE_SIZE, GFP_KERNEL)) == NULL) goto abort; - if (mddev->level == 6) { + if (mddev->new_level == 6) { conf->spare_page = alloc_page(GFP_KERNEL); if (!conf->spare_page) goto abort; } spin_lock_init(&conf->device_lock); - mddev->queue->queue_lock = &conf->device_lock; init_waitqueue_head(&conf->wait_for_stripe); init_waitqueue_head(&conf->wait_for_overlap); INIT_LIST_HEAD(&conf->handle_list); @@ -4121,47 +4391,134 @@ static int run(mddev_t *mddev) printk(KERN_INFO "raid5: device %s operational as raid" " disk %d\n", bdevname(rdev->bdev,b), raid_disk); - working_disks++; } else /* Cannot rely on bitmap to complete recovery */ conf->fullsync = 1; } - /* - * 0 for a fully functional array, 1 or 2 for a degraded array. - */ - mddev->degraded = conf->raid_disks - working_disks; - conf->mddev = mddev; - conf->chunk_size = mddev->chunk_size; - conf->level = mddev->level; + conf->chunk_size = mddev->new_chunk; + conf->level = mddev->new_level; if (conf->level == 6) conf->max_degraded = 2; else conf->max_degraded = 1; - conf->algorithm = mddev->layout; + conf->algorithm = mddev->new_layout; conf->max_nr_stripes = NR_STRIPES; - conf->expand_progress = mddev->reshape_position; - - /* device size must be a multiple of chunk size */ - mddev->size &= ~(mddev->chunk_size/1024 -1); - mddev->resync_max_sectors = mddev->size << 1; + conf->reshape_progress = mddev->reshape_position; + if (conf->reshape_progress != MaxSector) { + conf->prev_chunk = mddev->chunk_size; + conf->prev_algo = mddev->layout; + } - if (conf->level == 6 && conf->raid_disks < 4) { - printk(KERN_ERR "raid6: not enough configured devices for %s (%d, minimum 4)\n", - mdname(mddev), conf->raid_disks); + memory = conf->max_nr_stripes * (sizeof(struct stripe_head) + + conf->raid_disks * ((sizeof(struct bio) + PAGE_SIZE))) / 1024; + if (grow_stripes(conf, conf->max_nr_stripes)) { + printk(KERN_ERR + "raid5: couldn't allocate %dkB for buffers\n", memory); goto abort; - } - if (!conf->chunk_size || conf->chunk_size % 4) { - printk(KERN_ERR "raid5: invalid chunk size %d for %s\n", - conf->chunk_size, mdname(mddev)); + } else + printk(KERN_INFO "raid5: allocated %dkB for %s\n", + memory, mdname(mddev)); + + conf->thread = md_register_thread(raid5d, mddev, "%s_raid5"); + if (!conf->thread) { + printk(KERN_ERR + "raid5: couldn't allocate thread for %s\n", + mdname(mddev)); goto abort; } - if (conf->algorithm > ALGORITHM_RIGHT_SYMMETRIC) { - printk(KERN_ERR - "raid5: unsupported parity algorithm %d for %s\n", - conf->algorithm, mdname(mddev)); - goto abort; + + return conf; + + abort: + if (conf) { + shrink_stripes(conf); + safe_put_page(conf->spare_page); + kfree(conf->disks); + kfree(conf->stripe_hashtbl); + kfree(conf); + return ERR_PTR(-EIO); + } else + return ERR_PTR(-ENOMEM); +} + +static int run(mddev_t *mddev) +{ + raid5_conf_t *conf; + int working_disks = 0; + mdk_rdev_t *rdev; + + if (mddev->reshape_position != MaxSector) { + /* Check that we can continue the reshape. + * Currently only disks can change, it must + * increase, and we must be past the point where + * a stripe over-writes itself + */ + sector_t here_new, here_old; + int old_disks; + int max_degraded = (mddev->level == 6 ? 2 : 1); + + if (mddev->new_level != mddev->level) { + printk(KERN_ERR "raid5: %s: unsupported reshape " + "required - aborting.\n", + mdname(mddev)); + return -EINVAL; + } + old_disks = mddev->raid_disks - mddev->delta_disks; + /* reshape_position must be on a new-stripe boundary, and one + * further up in new geometry must map after here in old + * geometry. + */ + here_new = mddev->reshape_position; + if (sector_div(here_new, (mddev->new_chunk>>9)* + (mddev->raid_disks - max_degraded))) { + printk(KERN_ERR "raid5: reshape_position not " + "on a stripe boundary\n"); + return -EINVAL; + } + /* here_new is the stripe we will write to */ + here_old = mddev->reshape_position; + sector_div(here_old, (mddev->chunk_size>>9)* + (old_disks-max_degraded)); + /* here_old is the first stripe that we might need to read + * from */ + if (here_new >= here_old) { + /* Reading from the same stripe as writing to - bad */ + printk(KERN_ERR "raid5: reshape_position too early for " + "auto-recovery - aborting.\n"); + return -EINVAL; + } + printk(KERN_INFO "raid5: reshape will continue\n"); + /* OK, we should be able to continue; */ + } else { + BUG_ON(mddev->level != mddev->new_level); + BUG_ON(mddev->layout != mddev->new_layout); + BUG_ON(mddev->chunk_size != mddev->new_chunk); + BUG_ON(mddev->delta_disks != 0); } + + if (mddev->private == NULL) + conf = setup_conf(mddev); + else + conf = mddev->private; + + if (IS_ERR(conf)) + return PTR_ERR(conf); + + mddev->thread = conf->thread; + conf->thread = NULL; + mddev->private = conf; + + /* + * 0 for a fully functional array, 1 or 2 for a degraded array. + */ + list_for_each_entry(rdev, &mddev->disks, same_set) + if (rdev->raid_disk >= 0 && + test_bit(In_sync, &rdev->flags)) + working_disks++; + + mddev->degraded = conf->raid_disks - working_disks; + if (mddev->degraded > conf->max_degraded) { printk(KERN_ERR "raid5: not enough operational devices for %s" " (%d/%d failed)\n", @@ -4169,6 +4526,10 @@ static int run(mddev_t *mddev) goto abort; } + /* device size must be a multiple of chunk size */ + mddev->dev_sectors &= ~(mddev->chunk_size / 512 - 1); + mddev->resync_max_sectors = mddev->dev_sectors; + if (mddev->degraded > 0 && mddev->recovery_cp != MaxSector) { if (mddev->ok_start_degraded) @@ -4184,43 +4545,22 @@ static int run(mddev_t *mddev) } } - { - mddev->thread = md_register_thread(raid5d, mddev, "%s_raid5"); - if (!mddev->thread) { - printk(KERN_ERR - "raid5: couldn't allocate thread for %s\n", - mdname(mddev)); - goto abort; - } - } - memory = conf->max_nr_stripes * (sizeof(struct stripe_head) + - conf->raid_disks * ((sizeof(struct bio) + PAGE_SIZE))) / 1024; - if (grow_stripes(conf, conf->max_nr_stripes)) { - printk(KERN_ERR - "raid5: couldn't allocate %dkB for buffers\n", memory); - shrink_stripes(conf); - md_unregister_thread(mddev->thread); - goto abort; - } else - printk(KERN_INFO "raid5: allocated %dkB for %s\n", - memory, mdname(mddev)); - if (mddev->degraded == 0) printk("raid5: raid level %d set %s active with %d out of %d" - " devices, algorithm %d\n", conf->level, mdname(mddev), - mddev->raid_disks-mddev->degraded, mddev->raid_disks, - conf->algorithm); + " devices, algorithm %d\n", conf->level, mdname(mddev), + mddev->raid_disks-mddev->degraded, mddev->raid_disks, + mddev->new_layout); else printk(KERN_ALERT "raid5: raid level %d set %s active with %d" " out of %d devices, algorithm %d\n", conf->level, mdname(mddev), mddev->raid_disks - mddev->degraded, - mddev->raid_disks, conf->algorithm); + mddev->raid_disks, mddev->new_layout); print_raid5_conf(conf); - if (conf->expand_progress != MaxSector) { + if (conf->reshape_progress != MaxSector) { printk("...ok start reshape thread\n"); - conf->expand_lo = conf->expand_progress; + conf->reshape_safe = conf->reshape_progress; atomic_set(&conf->reshape_stripes, 0); clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); @@ -4247,18 +4587,22 @@ static int run(mddev_t *mddev) "raid5: failed to create sysfs attributes for %s\n", mdname(mddev)); + mddev->queue->queue_lock = &conf->device_lock; + mddev->queue->unplug_fn = raid5_unplug_device; mddev->queue->backing_dev_info.congested_data = mddev; mddev->queue->backing_dev_info.congested_fn = raid5_congested; - mddev->array_sectors = 2 * mddev->size * (conf->previous_raid_disks - - conf->max_degraded); + md_set_array_sectors(mddev, raid5_size(mddev, 0, 0)); blk_queue_merge_bvec(mddev->queue, raid5_mergeable_bvec); return 0; abort: + md_unregister_thread(mddev->thread); + mddev->thread = NULL; if (conf) { + shrink_stripes(conf); print_raid5_conf(conf); safe_put_page(conf->spare_page); kfree(conf->disks); @@ -4396,6 +4740,10 @@ static int raid5_remove_disk(mddev_t *mddev, int number) print_raid5_conf(conf); rdev = p->rdev; if (rdev) { + if (number >= conf->raid_disks && + conf->reshape_progress == MaxSector) + clear_bit(In_sync, &rdev->flags); + if (test_bit(In_sync, &rdev->flags) || atomic_read(&rdev->nr_pending)) { err = -EBUSY; @@ -4405,7 +4753,8 @@ static int raid5_remove_disk(mddev_t *mddev, int number) * isn't possible. */ if (!test_bit(Faulty, &rdev->flags) && - mddev->degraded <= conf->max_degraded) { + mddev->degraded <= conf->max_degraded && + number < conf->raid_disks) { err = -EBUSY; goto abort; } @@ -4472,36 +4821,48 @@ static int raid5_resize(mddev_t *mddev, sector_t sectors) * any io in the removed space completes, but it hardly seems * worth it. */ - raid5_conf_t *conf = mddev_to_conf(mddev); - sectors &= ~((sector_t)mddev->chunk_size/512 - 1); - mddev->array_sectors = sectors * (mddev->raid_disks - - conf->max_degraded); + md_set_array_sectors(mddev, raid5_size(mddev, sectors, + mddev->raid_disks)); + if (mddev->array_sectors > + raid5_size(mddev, sectors, mddev->raid_disks)) + return -EINVAL; set_capacity(mddev->gendisk, mddev->array_sectors); mddev->changed = 1; - if (sectors/2 > mddev->size && mddev->recovery_cp == MaxSector) { - mddev->recovery_cp = mddev->size << 1; + if (sectors > mddev->dev_sectors && mddev->recovery_cp == MaxSector) { + mddev->recovery_cp = mddev->dev_sectors; set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); } - mddev->size = sectors /2; + mddev->dev_sectors = sectors; mddev->resync_max_sectors = sectors; return 0; } -#ifdef CONFIG_MD_RAID5_RESHAPE static int raid5_check_reshape(mddev_t *mddev) { raid5_conf_t *conf = mddev_to_conf(mddev); - int err; - if (mddev->delta_disks < 0 || - mddev->new_level != mddev->level) - return -EINVAL; /* Cannot shrink array or change level yet */ - if (mddev->delta_disks == 0) - return 0; /* nothing to do */ + if (mddev->delta_disks == 0 && + mddev->new_layout == mddev->layout && + mddev->new_chunk == mddev->chunk_size) + return -EINVAL; /* nothing to do */ if (mddev->bitmap) /* Cannot grow a bitmap yet */ return -EBUSY; + if (mddev->degraded > conf->max_degraded) + return -EINVAL; + if (mddev->delta_disks < 0) { + /* We might be able to shrink, but the devices must + * be made bigger first. + * For raid6, 4 is the minimum size. + * Otherwise 2 is the minimum + */ + int min = 2; + if (mddev->level == 6) + min = 4; + if (mddev->raid_disks + mddev->delta_disks < min) + return -EINVAL; + } /* Can only proceed if there are plenty of stripe_heads. * We need a minimum of one full stripe,, and for sensible progress @@ -4514,18 +4875,12 @@ static int raid5_check_reshape(mddev_t *mddev) if ((mddev->chunk_size / STRIPE_SIZE) * 4 > conf->max_nr_stripes || (mddev->new_chunk / STRIPE_SIZE) * 4 > conf->max_nr_stripes) { printk(KERN_WARNING "raid5: reshape: not enough stripes. Needed %lu\n", - (mddev->chunk_size / STRIPE_SIZE)*4); + (max(mddev->chunk_size, mddev->new_chunk) + / STRIPE_SIZE)*4); return -ENOSPC; } - err = resize_stripes(conf, conf->raid_disks + mddev->delta_disks); - if (err) - return err; - - if (mddev->degraded > conf->max_degraded) - return -EINVAL; - /* looks like we might be able to manage this */ - return 0; + return resize_stripes(conf, conf->raid_disks + mddev->delta_disks); } static int raid5_start_reshape(mddev_t *mddev) @@ -4550,12 +4905,31 @@ static int raid5_start_reshape(mddev_t *mddev) */ return -EINVAL; + /* Refuse to reduce size of the array. Any reductions in + * array size must be through explicit setting of array_size + * attribute. + */ + if (raid5_size(mddev, 0, conf->raid_disks + mddev->delta_disks) + < mddev->array_sectors) { + printk(KERN_ERR "md: %s: array size must be reduced " + "before number of disks\n", mdname(mddev)); + return -EINVAL; + } + atomic_set(&conf->reshape_stripes, 0); spin_lock_irq(&conf->device_lock); conf->previous_raid_disks = conf->raid_disks; conf->raid_disks += mddev->delta_disks; - conf->expand_progress = 0; - conf->expand_lo = 0; + conf->prev_chunk = conf->chunk_size; + conf->chunk_size = mddev->new_chunk; + conf->prev_algo = conf->algorithm; + conf->algorithm = mddev->new_layout; + if (mddev->delta_disks < 0) + conf->reshape_progress = raid5_size(mddev, 0, 0); + else + conf->reshape_progress = 0; + conf->reshape_safe = conf->reshape_progress; + conf->generation++; spin_unlock_irq(&conf->device_lock); /* Add some new drives, as many as will fit. @@ -4580,9 +4954,12 @@ static int raid5_start_reshape(mddev_t *mddev) break; } - spin_lock_irqsave(&conf->device_lock, flags); - mddev->degraded = (conf->raid_disks - conf->previous_raid_disks) - added_devices; - spin_unlock_irqrestore(&conf->device_lock, flags); + if (mddev->delta_disks > 0) { + spin_lock_irqsave(&conf->device_lock, flags); + mddev->degraded = (conf->raid_disks - conf->previous_raid_disks) + - added_devices; + spin_unlock_irqrestore(&conf->device_lock, flags); + } mddev->raid_disks = conf->raid_disks; mddev->reshape_position = 0; set_bit(MD_CHANGE_DEVS, &mddev->flags); @@ -4597,52 +4974,86 @@ static int raid5_start_reshape(mddev_t *mddev) mddev->recovery = 0; spin_lock_irq(&conf->device_lock); mddev->raid_disks = conf->raid_disks = conf->previous_raid_disks; - conf->expand_progress = MaxSector; + conf->reshape_progress = MaxSector; spin_unlock_irq(&conf->device_lock); return -EAGAIN; } + conf->reshape_checkpoint = jiffies; md_wakeup_thread(mddev->sync_thread); md_new_event(mddev); return 0; } -#endif +/* This is called from the reshape thread and should make any + * changes needed in 'conf' + */ static void end_reshape(raid5_conf_t *conf) { - struct block_device *bdev; if (!test_bit(MD_RECOVERY_INTR, &conf->mddev->recovery)) { - conf->mddev->array_sectors = 2 * conf->mddev->size * - (conf->raid_disks - conf->max_degraded); - set_capacity(conf->mddev->gendisk, conf->mddev->array_sectors); - conf->mddev->changed = 1; - - bdev = bdget_disk(conf->mddev->gendisk, 0); - if (bdev) { - mutex_lock(&bdev->bd_inode->i_mutex); - i_size_write(bdev->bd_inode, - (loff_t)conf->mddev->array_sectors << 9); - mutex_unlock(&bdev->bd_inode->i_mutex); - bdput(bdev); - } + spin_lock_irq(&conf->device_lock); - conf->expand_progress = MaxSector; + conf->previous_raid_disks = conf->raid_disks; + conf->reshape_progress = MaxSector; spin_unlock_irq(&conf->device_lock); - conf->mddev->reshape_position = MaxSector; + wake_up(&conf->wait_for_overlap); /* read-ahead size must cover two whole stripes, which is * 2 * (datadisks) * chunksize where 'n' is the number of raid devices */ { - int data_disks = conf->previous_raid_disks - conf->max_degraded; - int stripe = data_disks * - (conf->mddev->chunk_size / PAGE_SIZE); + int data_disks = conf->raid_disks - conf->max_degraded; + int stripe = data_disks * (conf->chunk_size + / PAGE_SIZE); if (conf->mddev->queue->backing_dev_info.ra_pages < 2 * stripe) conf->mddev->queue->backing_dev_info.ra_pages = 2 * stripe; } } } +/* This is called from the raid5d thread with mddev_lock held. + * It makes config changes to the device. + */ +static void raid5_finish_reshape(mddev_t *mddev) +{ + struct block_device *bdev; + raid5_conf_t *conf = mddev_to_conf(mddev); + + if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { + + if (mddev->delta_disks > 0) { + md_set_array_sectors(mddev, raid5_size(mddev, 0, 0)); + set_capacity(mddev->gendisk, mddev->array_sectors); + mddev->changed = 1; + + bdev = bdget_disk(mddev->gendisk, 0); + if (bdev) { + mutex_lock(&bdev->bd_inode->i_mutex); + i_size_write(bdev->bd_inode, + (loff_t)mddev->array_sectors << 9); + mutex_unlock(&bdev->bd_inode->i_mutex); + bdput(bdev); + } + } else { + int d; + mddev->degraded = conf->raid_disks; + for (d = 0; d < conf->raid_disks ; d++) + if (conf->disks[d].rdev && + test_bit(In_sync, + &conf->disks[d].rdev->flags)) + mddev->degraded--; + for (d = conf->raid_disks ; + d < conf->raid_disks - mddev->delta_disks; + d++) + raid5_remove_disk(mddev, d); + } + mddev->layout = conf->algorithm; + mddev->chunk_size = conf->chunk_size; + mddev->reshape_position = MaxSector; + mddev->delta_disks = 0; + } +} + static void raid5_quiesce(mddev_t *mddev, int state) { raid5_conf_t *conf = mddev_to_conf(mddev); @@ -4672,6 +5083,212 @@ static void raid5_quiesce(mddev_t *mddev, int state) } } + +static void *raid5_takeover_raid1(mddev_t *mddev) +{ + int chunksect; + + if (mddev->raid_disks != 2 || + mddev->degraded > 1) + return ERR_PTR(-EINVAL); + + /* Should check if there are write-behind devices? */ + + chunksect = 64*2; /* 64K by default */ + + /* The array must be an exact multiple of chunksize */ + while (chunksect && (mddev->array_sectors & (chunksect-1))) + chunksect >>= 1; + + if ((chunksect<<9) < STRIPE_SIZE) + /* array size does not allow a suitable chunk size */ + return ERR_PTR(-EINVAL); + + mddev->new_level = 5; + mddev->new_layout = ALGORITHM_LEFT_SYMMETRIC; + mddev->new_chunk = chunksect << 9; + + return setup_conf(mddev); +} + +static void *raid5_takeover_raid6(mddev_t *mddev) +{ + int new_layout; + + switch (mddev->layout) { + case ALGORITHM_LEFT_ASYMMETRIC_6: + new_layout = ALGORITHM_LEFT_ASYMMETRIC; + break; + case ALGORITHM_RIGHT_ASYMMETRIC_6: + new_layout = ALGORITHM_RIGHT_ASYMMETRIC; + break; + case ALGORITHM_LEFT_SYMMETRIC_6: + new_layout = ALGORITHM_LEFT_SYMMETRIC; + break; + case ALGORITHM_RIGHT_SYMMETRIC_6: + new_layout = ALGORITHM_RIGHT_SYMMETRIC; + break; + case ALGORITHM_PARITY_0_6: + new_layout = ALGORITHM_PARITY_0; + break; + case ALGORITHM_PARITY_N: + new_layout = ALGORITHM_PARITY_N; + break; + default: + return ERR_PTR(-EINVAL); + } + mddev->new_level = 5; + mddev->new_layout = new_layout; + mddev->delta_disks = -1; + mddev->raid_disks -= 1; + return setup_conf(mddev); +} + + +static int raid5_reconfig(mddev_t *mddev, int new_layout, int new_chunk) +{ + /* For a 2-drive array, the layout and chunk size can be changed + * immediately as not restriping is needed. + * For larger arrays we record the new value - after validation + * to be used by a reshape pass. + */ + raid5_conf_t *conf = mddev_to_conf(mddev); + + if (new_layout >= 0 && !algorithm_valid_raid5(new_layout)) + return -EINVAL; + if (new_chunk > 0) { + if (new_chunk & (new_chunk-1)) + /* not a power of 2 */ + return -EINVAL; + if (new_chunk < PAGE_SIZE) + return -EINVAL; + if (mddev->array_sectors & ((new_chunk>>9)-1)) + /* not factor of array size */ + return -EINVAL; + } + + /* They look valid */ + + if (mddev->raid_disks == 2) { + + if (new_layout >= 0) { + conf->algorithm = new_layout; + mddev->layout = mddev->new_layout = new_layout; + } + if (new_chunk > 0) { + conf->chunk_size = new_chunk; + mddev->chunk_size = mddev->new_chunk = new_chunk; + } + set_bit(MD_CHANGE_DEVS, &mddev->flags); + md_wakeup_thread(mddev->thread); + } else { + if (new_layout >= 0) + mddev->new_layout = new_layout; + if (new_chunk > 0) + mddev->new_chunk = new_chunk; + } + return 0; +} + +static int raid6_reconfig(mddev_t *mddev, int new_layout, int new_chunk) +{ + if (new_layout >= 0 && !algorithm_valid_raid6(new_layout)) + return -EINVAL; + if (new_chunk > 0) { + if (new_chunk & (new_chunk-1)) + /* not a power of 2 */ + return -EINVAL; + if (new_chunk < PAGE_SIZE) + return -EINVAL; + if (mddev->array_sectors & ((new_chunk>>9)-1)) + /* not factor of array size */ + return -EINVAL; + } + + /* They look valid */ + + if (new_layout >= 0) + mddev->new_layout = new_layout; + if (new_chunk > 0) + mddev->new_chunk = new_chunk; + + return 0; +} + +static void *raid5_takeover(mddev_t *mddev) +{ + /* raid5 can take over: + * raid0 - if all devices are the same - make it a raid4 layout + * raid1 - if there are two drives. We need to know the chunk size + * raid4 - trivial - just use a raid4 layout. + * raid6 - Providing it is a *_6 layout + * + * For now, just do raid1 + */ + + if (mddev->level == 1) + return raid5_takeover_raid1(mddev); + if (mddev->level == 4) { + mddev->new_layout = ALGORITHM_PARITY_N; + mddev->new_level = 5; + return setup_conf(mddev); + } + if (mddev->level == 6) + return raid5_takeover_raid6(mddev); + + return ERR_PTR(-EINVAL); +} + + +static struct mdk_personality raid5_personality; + +static void *raid6_takeover(mddev_t *mddev) +{ + /* Currently can only take over a raid5. We map the + * personality to an equivalent raid6 personality + * with the Q block at the end. + */ + int new_layout; + + if (mddev->pers != &raid5_personality) + return ERR_PTR(-EINVAL); + if (mddev->degraded > 1) + return ERR_PTR(-EINVAL); + if (mddev->raid_disks > 253) + return ERR_PTR(-EINVAL); + if (mddev->raid_disks < 3) + return ERR_PTR(-EINVAL); + + switch (mddev->layout) { + case ALGORITHM_LEFT_ASYMMETRIC: + new_layout = ALGORITHM_LEFT_ASYMMETRIC_6; + break; + case ALGORITHM_RIGHT_ASYMMETRIC: + new_layout = ALGORITHM_RIGHT_ASYMMETRIC_6; + break; + case ALGORITHM_LEFT_SYMMETRIC: + new_layout = ALGORITHM_LEFT_SYMMETRIC_6; + break; + case ALGORITHM_RIGHT_SYMMETRIC: + new_layout = ALGORITHM_RIGHT_SYMMETRIC_6; + break; + case ALGORITHM_PARITY_0: + new_layout = ALGORITHM_PARITY_0_6; + break; + case ALGORITHM_PARITY_N: + new_layout = ALGORITHM_PARITY_N; + break; + default: + return ERR_PTR(-EINVAL); + } + mddev->new_level = 6; + mddev->new_layout = new_layout; + mddev->delta_disks = 1; + mddev->raid_disks += 1; + return setup_conf(mddev); +} + + static struct mdk_personality raid6_personality = { .name = "raid6", @@ -4687,11 +5304,13 @@ static struct mdk_personality raid6_personality = .spare_active = raid5_spare_active, .sync_request = sync_request, .resize = raid5_resize, -#ifdef CONFIG_MD_RAID5_RESHAPE + .size = raid5_size, .check_reshape = raid5_check_reshape, .start_reshape = raid5_start_reshape, -#endif + .finish_reshape = raid5_finish_reshape, .quiesce = raid5_quiesce, + .takeover = raid6_takeover, + .reconfig = raid6_reconfig, }; static struct mdk_personality raid5_personality = { @@ -4708,11 +5327,13 @@ static struct mdk_personality raid5_personality = .spare_active = raid5_spare_active, .sync_request = sync_request, .resize = raid5_resize, -#ifdef CONFIG_MD_RAID5_RESHAPE + .size = raid5_size, .check_reshape = raid5_check_reshape, .start_reshape = raid5_start_reshape, -#endif + .finish_reshape = raid5_finish_reshape, .quiesce = raid5_quiesce, + .takeover = raid5_takeover, + .reconfig = raid5_reconfig, }; static struct mdk_personality raid4_personality = @@ -4730,20 +5351,15 @@ static struct mdk_personality raid4_personality = .spare_active = raid5_spare_active, .sync_request = sync_request, .resize = raid5_resize, -#ifdef CONFIG_MD_RAID5_RESHAPE + .size = raid5_size, .check_reshape = raid5_check_reshape, .start_reshape = raid5_start_reshape, -#endif + .finish_reshape = raid5_finish_reshape, .quiesce = raid5_quiesce, }; static int __init raid5_init(void) { - int e; - - e = raid6_select_algo(); - if ( e ) - return e; register_md_personality(&raid6_personality); register_md_personality(&raid5_personality); register_md_personality(&raid4_personality); |