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btrfs: btrfs_multi_bio replaced with btrfs_bio
btrfs_bio is a bio abstraction able to split and not complete after the last bio has returned (like the old btrfs_multi_bio). Additionally, btrfs_bio tracks the mirror_num used to read data which can be used for error correction purposes. Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>
This commit is contained in:
Jan Schmidt
parent
d7728c960d
commit
a1d3c4786a
4 changed files with 90 additions and 78 deletions
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@ -2848,7 +2848,7 @@ static int find_live_mirror(struct map_lookup *map, int first, int num,
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static int __btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw,
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u64 logical, u64 *length,
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struct btrfs_multi_bio **multi_ret,
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struct btrfs_bio **bbio_ret,
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int mirror_num)
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{
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struct extent_map *em;
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@ -2866,18 +2866,18 @@ static int __btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw,
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int i;
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int num_stripes;
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int max_errors = 0;
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struct btrfs_multi_bio *multi = NULL;
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struct btrfs_bio *bbio = NULL;
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if (multi_ret && !(rw & (REQ_WRITE | REQ_DISCARD)))
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if (bbio_ret && !(rw & (REQ_WRITE | REQ_DISCARD)))
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stripes_allocated = 1;
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again:
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if (multi_ret) {
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multi = kzalloc(btrfs_multi_bio_size(stripes_allocated),
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if (bbio_ret) {
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bbio = kzalloc(btrfs_bio_size(stripes_allocated),
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GFP_NOFS);
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if (!multi)
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if (!bbio)
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return -ENOMEM;
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atomic_set(&multi->error, 0);
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atomic_set(&bbio->error, 0);
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}
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read_lock(&em_tree->lock);
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@ -2898,7 +2898,7 @@ again:
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if (mirror_num > map->num_stripes)
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mirror_num = 0;
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/* if our multi bio struct is too small, back off and try again */
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/* if our btrfs_bio struct is too small, back off and try again */
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if (rw & REQ_WRITE) {
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if (map->type & (BTRFS_BLOCK_GROUP_RAID1 |
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BTRFS_BLOCK_GROUP_DUP)) {
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@ -2917,11 +2917,11 @@ again:
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stripes_required = map->num_stripes;
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}
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}
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if (multi_ret && (rw & (REQ_WRITE | REQ_DISCARD)) &&
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if (bbio_ret && (rw & (REQ_WRITE | REQ_DISCARD)) &&
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stripes_allocated < stripes_required) {
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stripes_allocated = map->num_stripes;
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free_extent_map(em);
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kfree(multi);
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kfree(bbio);
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goto again;
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}
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stripe_nr = offset;
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@ -2950,7 +2950,7 @@ again:
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*length = em->len - offset;
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}
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if (!multi_ret)
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if (!bbio_ret)
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goto out;
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num_stripes = 1;
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@ -2975,13 +2975,17 @@ again:
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stripe_index = find_live_mirror(map, 0,
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map->num_stripes,
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current->pid % map->num_stripes);
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mirror_num = stripe_index + 1;
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}
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} else if (map->type & BTRFS_BLOCK_GROUP_DUP) {
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if (rw & (REQ_WRITE | REQ_DISCARD))
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if (rw & (REQ_WRITE | REQ_DISCARD)) {
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num_stripes = map->num_stripes;
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else if (mirror_num)
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} else if (mirror_num) {
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stripe_index = mirror_num - 1;
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} else {
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mirror_num = 1;
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}
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} else if (map->type & BTRFS_BLOCK_GROUP_RAID10) {
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int factor = map->num_stripes / map->sub_stripes;
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@ -3001,6 +3005,7 @@ again:
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stripe_index = find_live_mirror(map, stripe_index,
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map->sub_stripes, stripe_index +
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current->pid % map->sub_stripes);
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mirror_num = stripe_index + 1;
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}
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} else {
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/*
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@ -3009,15 +3014,16 @@ again:
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* stripe_index is the number of our device in the stripe array
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*/
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stripe_index = do_div(stripe_nr, map->num_stripes);
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mirror_num = stripe_index + 1;
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}
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BUG_ON(stripe_index >= map->num_stripes);
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if (rw & REQ_DISCARD) {
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for (i = 0; i < num_stripes; i++) {
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multi->stripes[i].physical =
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bbio->stripes[i].physical =
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map->stripes[stripe_index].physical +
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stripe_offset + stripe_nr * map->stripe_len;
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multi->stripes[i].dev = map->stripes[stripe_index].dev;
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bbio->stripes[i].dev = map->stripes[stripe_index].dev;
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if (map->type & BTRFS_BLOCK_GROUP_RAID0) {
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u64 stripes;
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@ -3038,16 +3044,16 @@ again:
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}
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stripes = stripe_nr_end - 1 - j;
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do_div(stripes, map->num_stripes);
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multi->stripes[i].length = map->stripe_len *
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bbio->stripes[i].length = map->stripe_len *
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(stripes - stripe_nr + 1);
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if (i == 0) {
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multi->stripes[i].length -=
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bbio->stripes[i].length -=
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stripe_offset;
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stripe_offset = 0;
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}
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if (stripe_index == last_stripe)
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multi->stripes[i].length -=
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bbio->stripes[i].length -=
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stripe_end_offset;
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} else if (map->type & BTRFS_BLOCK_GROUP_RAID10) {
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u64 stripes;
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@ -3072,11 +3078,11 @@ again:
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}
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stripes = stripe_nr_end - 1 - j;
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do_div(stripes, factor);
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multi->stripes[i].length = map->stripe_len *
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bbio->stripes[i].length = map->stripe_len *
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(stripes - stripe_nr + 1);
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if (i < map->sub_stripes) {
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multi->stripes[i].length -=
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bbio->stripes[i].length -=
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stripe_offset;
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if (i == map->sub_stripes - 1)
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stripe_offset = 0;
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@ -3084,11 +3090,11 @@ again:
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if (stripe_index >= last_stripe &&
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stripe_index <= (last_stripe +
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map->sub_stripes - 1)) {
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multi->stripes[i].length -=
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bbio->stripes[i].length -=
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stripe_end_offset;
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}
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} else
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multi->stripes[i].length = *length;
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bbio->stripes[i].length = *length;
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stripe_index++;
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if (stripe_index == map->num_stripes) {
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@ -3099,19 +3105,20 @@ again:
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}
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} else {
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for (i = 0; i < num_stripes; i++) {
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multi->stripes[i].physical =
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bbio->stripes[i].physical =
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map->stripes[stripe_index].physical +
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stripe_offset +
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stripe_nr * map->stripe_len;
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multi->stripes[i].dev =
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bbio->stripes[i].dev =
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map->stripes[stripe_index].dev;
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stripe_index++;
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}
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}
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if (multi_ret) {
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*multi_ret = multi;
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multi->num_stripes = num_stripes;
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multi->max_errors = max_errors;
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if (bbio_ret) {
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*bbio_ret = bbio;
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bbio->num_stripes = num_stripes;
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bbio->max_errors = max_errors;
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bbio->mirror_num = mirror_num;
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}
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out:
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free_extent_map(em);
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@ -3120,9 +3127,9 @@ out:
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int btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw,
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u64 logical, u64 *length,
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struct btrfs_multi_bio **multi_ret, int mirror_num)
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struct btrfs_bio **bbio_ret, int mirror_num)
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{
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return __btrfs_map_block(map_tree, rw, logical, length, multi_ret,
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return __btrfs_map_block(map_tree, rw, logical, length, bbio_ret,
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mirror_num);
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}
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@ -3191,28 +3198,28 @@ int btrfs_rmap_block(struct btrfs_mapping_tree *map_tree,
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return 0;
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}
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static void end_bio_multi_stripe(struct bio *bio, int err)
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static void btrfs_end_bio(struct bio *bio, int err)
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{
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struct btrfs_multi_bio *multi = bio->bi_private;
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struct btrfs_bio *bbio = bio->bi_private;
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int is_orig_bio = 0;
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if (err)
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atomic_inc(&multi->error);
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atomic_inc(&bbio->error);
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if (bio == multi->orig_bio)
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if (bio == bbio->orig_bio)
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is_orig_bio = 1;
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if (atomic_dec_and_test(&multi->stripes_pending)) {
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if (atomic_dec_and_test(&bbio->stripes_pending)) {
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if (!is_orig_bio) {
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bio_put(bio);
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bio = multi->orig_bio;
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bio = bbio->orig_bio;
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}
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bio->bi_private = multi->private;
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bio->bi_end_io = multi->end_io;
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bio->bi_private = bbio->private;
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bio->bi_end_io = bbio->end_io;
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/* only send an error to the higher layers if it is
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* beyond the tolerance of the multi-bio
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*/
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if (atomic_read(&multi->error) > multi->max_errors) {
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if (atomic_read(&bbio->error) > bbio->max_errors) {
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err = -EIO;
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} else if (err) {
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/*
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@ -3222,7 +3229,7 @@ static void end_bio_multi_stripe(struct bio *bio, int err)
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set_bit(BIO_UPTODATE, &bio->bi_flags);
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err = 0;
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}
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kfree(multi);
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kfree(bbio);
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bio_endio(bio, err);
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} else if (!is_orig_bio) {
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@ -3302,20 +3309,20 @@ int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio,
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u64 logical = (u64)bio->bi_sector << 9;
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u64 length = 0;
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u64 map_length;
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struct btrfs_multi_bio *multi = NULL;
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int ret;
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int dev_nr = 0;
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int total_devs = 1;
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struct btrfs_bio *bbio = NULL;
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length = bio->bi_size;
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map_tree = &root->fs_info->mapping_tree;
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map_length = length;
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ret = btrfs_map_block(map_tree, rw, logical, &map_length, &multi,
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ret = btrfs_map_block(map_tree, rw, logical, &map_length, &bbio,
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mirror_num);
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BUG_ON(ret);
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total_devs = multi->num_stripes;
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total_devs = bbio->num_stripes;
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if (map_length < length) {
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printk(KERN_CRIT "mapping failed logical %llu bio len %llu "
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"len %llu\n", (unsigned long long)logical,
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@ -3323,25 +3330,28 @@ int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio,
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(unsigned long long)map_length);
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BUG();
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}
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multi->end_io = first_bio->bi_end_io;
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multi->private = first_bio->bi_private;
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multi->orig_bio = first_bio;
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atomic_set(&multi->stripes_pending, multi->num_stripes);
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bbio->orig_bio = first_bio;
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bbio->private = first_bio->bi_private;
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bbio->end_io = first_bio->bi_end_io;
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atomic_set(&bbio->stripes_pending, bbio->num_stripes);
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while (dev_nr < total_devs) {
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if (total_devs > 1) {
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if (dev_nr < total_devs - 1) {
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bio = bio_clone(first_bio, GFP_NOFS);
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BUG_ON(!bio);
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} else {
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bio = first_bio;
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}
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bio->bi_private = multi;
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bio->bi_end_io = end_bio_multi_stripe;
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if (dev_nr < total_devs - 1) {
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bio = bio_clone(first_bio, GFP_NOFS);
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BUG_ON(!bio);
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} else {
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bio = first_bio;
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}
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bio->bi_sector = multi->stripes[dev_nr].physical >> 9;
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dev = multi->stripes[dev_nr].dev;
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bio->bi_private = bbio;
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bio->bi_end_io = btrfs_end_bio;
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bio->bi_sector = bbio->stripes[dev_nr].physical >> 9;
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dev = bbio->stripes[dev_nr].dev;
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if (dev && dev->bdev && (rw != WRITE || dev->writeable)) {
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pr_debug("btrfs_map_bio: rw %d, secor=%llu, dev=%lu "
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"(%s id %llu), size=%u\n", rw,
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(u64)bio->bi_sector, (u_long)dev->bdev->bd_dev,
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dev->name, dev->devid, bio->bi_size);
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bio->bi_bdev = dev->bdev;
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if (async_submit)
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schedule_bio(root, dev, rw, bio);
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@ -3354,8 +3364,6 @@ int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio,
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}
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dev_nr++;
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}
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if (total_devs == 1)
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kfree(multi);
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return 0;
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}
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