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Btrfs: Make raid_map array be inlined in btrfs_bio structure 

It can make code more simple and clear, we need not care about
free bbio and raid_map together.

Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Zhao Lei <zhaolei@cn.fujitsu.com>
Signed-off-by: Chris Mason <clm@fb.com>
hifive-unleashed-5.1
Zhao Lei 2015-01-20 15:11:33 +08:00 committed by Chris Mason
parent cc7539edea
commit 8e5cfb55d3
5 changed files with 105 additions and 125 deletions
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77
fs/btrfs/raid56.c
View File

@ -79,13 +79,6 @@ struct btrfs_raid_bio {
struct btrfs_fs_info *fs_info;
struct btrfs_bio *bbio;
/*
* logical block numbers for the start of each stripe
* The last one or two are p/q. These are sorted,
* so raid_map[0] is the start of our full stripe
*/
u64 *raid_map;
/* while we're doing rmw on a stripe
* we put it into a hash table so we can
* lock the stripe and merge more rbios
@ -303,7 +296,7 @@ static void cache_rbio_pages(struct btrfs_raid_bio *rbio)
*/
static int rbio_bucket(struct btrfs_raid_bio *rbio)
{
u64 num = rbio->raid_map[0];
u64 num = rbio->bbio->raid_map[0];
/*
* we shift down quite a bit. We're using byte
@ -606,8 +599,8 @@ static int rbio_can_merge(struct btrfs_raid_bio *last,
test_bit(RBIO_CACHE_BIT, &cur->flags))
return 0;
if (last->raid_map[0] !=
cur->raid_map[0])
if (last->bbio->raid_map[0] !=
cur->bbio->raid_map[0])
return 0;
/* we can't merge with different operations */
@ -689,7 +682,7 @@ static noinline int lock_stripe_add(struct btrfs_raid_bio *rbio)
spin_lock_irqsave(&h->lock, flags);
list_for_each_entry(cur, &h->hash_list, hash_list) {
walk++;
if (cur->raid_map[0] == rbio->raid_map[0]) {
if (cur->bbio->raid_map[0] == rbio->bbio->raid_map[0]) {
spin_lock(&cur->bio_list_lock);
/* can we steal this cached rbio's pages? */
@ -842,18 +835,16 @@ done_nolock:
}
static inline void
__free_bbio_and_raid_map(struct btrfs_bio *bbio, u64 *raid_map, int need)
__free_bbio(struct btrfs_bio *bbio, int need)
{
if (need) {
kfree(raid_map);
if (need)
kfree(bbio);
}
}
static inline void free_bbio_and_raid_map(struct btrfs_raid_bio *rbio)
static inline void free_bbio(struct btrfs_raid_bio *rbio)
{
__free_bbio_and_raid_map(rbio->bbio, rbio->raid_map,
!test_bit(RBIO_HOLD_BBIO_MAP_BIT, &rbio->flags));
__free_bbio(rbio->bbio,
!test_bit(RBIO_HOLD_BBIO_MAP_BIT, &rbio->flags));
}
static void __free_raid_bio(struct btrfs_raid_bio *rbio)
@ -875,7 +866,7 @@ static void __free_raid_bio(struct btrfs_raid_bio *rbio)
}
}
free_bbio_and_raid_map(rbio);
free_bbio(rbio);
kfree(rbio);
}
@ -985,8 +976,7 @@ static unsigned long rbio_nr_pages(unsigned long stripe_len, int nr_stripes)
* this does not allocate any pages for rbio->pages.
*/
static struct btrfs_raid_bio *alloc_rbio(struct btrfs_root *root,
struct btrfs_bio *bbio, u64 *raid_map,
u64 stripe_len)
struct btrfs_bio *bbio, u64 stripe_len)
{
struct btrfs_raid_bio *rbio;
int nr_data = 0;
@ -1007,7 +997,6 @@ static struct btrfs_raid_bio *alloc_rbio(struct btrfs_root *root,
INIT_LIST_HEAD(&rbio->stripe_cache);
INIT_LIST_HEAD(&rbio->hash_list);
rbio->bbio = bbio;
rbio->raid_map = raid_map;
rbio->fs_info = root->fs_info;
rbio->stripe_len = stripe_len;
rbio->nr_pages = num_pages;
@ -1028,7 +1017,7 @@ static struct btrfs_raid_bio *alloc_rbio(struct btrfs_root *root,
rbio->bio_pages = p + sizeof(struct page *) * num_pages;
rbio->dbitmap = p + sizeof(struct page *) * num_pages * 2;
if (raid_map[real_stripes - 1] == RAID6_Q_STRIPE)
if (bbio->raid_map[real_stripes - 1] == RAID6_Q_STRIPE)
nr_data = real_stripes - 2;
else
nr_data = real_stripes - 1;
@ -1182,7 +1171,7 @@ static void index_rbio_pages(struct btrfs_raid_bio *rbio)
spin_lock_irq(&rbio->bio_list_lock);
bio_list_for_each(bio, &rbio->bio_list) {
start = (u64)bio->bi_iter.bi_sector << 9;
stripe_offset = start - rbio->raid_map[0];
stripe_offset = start - rbio->bbio->raid_map[0];
page_index = stripe_offset >> PAGE_CACHE_SHIFT;
for (i = 0; i < bio->bi_vcnt; i++) {
@ -1402,7 +1391,7 @@ static int find_logical_bio_stripe(struct btrfs_raid_bio *rbio,
logical <<= 9;
for (i = 0; i < rbio->nr_data; i++) {
stripe_start = rbio->raid_map[i];
stripe_start = rbio->bbio->raid_map[i];
if (logical >= stripe_start &&
logical < stripe_start + rbio->stripe_len) {
return i;
@ -1776,17 +1765,16 @@ static void btrfs_raid_unplug(struct blk_plug_cb *cb, bool from_schedule)
* our main entry point for writes from the rest of the FS.
*/
int raid56_parity_write(struct btrfs_root *root, struct bio *bio,
struct btrfs_bio *bbio, u64 *raid_map,
u64 stripe_len)
struct btrfs_bio *bbio, u64 stripe_len)
{
struct btrfs_raid_bio *rbio;
struct btrfs_plug_cb *plug = NULL;
struct blk_plug_cb *cb;
int ret;
rbio = alloc_rbio(root, bbio, raid_map, stripe_len);
rbio = alloc_rbio(root, bbio, stripe_len);
if (IS_ERR(rbio)) {
__free_bbio_and_raid_map(bbio, raid_map, 1);
__free_bbio(bbio, 1);
return PTR_ERR(rbio);
}
bio_list_add(&rbio->bio_list, bio);
@ -1885,7 +1873,7 @@ static void __raid_recover_end_io(struct btrfs_raid_bio *rbio)
}
/* all raid6 handling here */
if (rbio->raid_map[rbio->real_stripes - 1] ==
if (rbio->bbio->raid_map[rbio->real_stripes - 1] ==
RAID6_Q_STRIPE) {
/*
@ -1922,8 +1910,9 @@ static void __raid_recover_end_io(struct btrfs_raid_bio *rbio)
* here due to a crc mismatch and we can't give them the
* data they want
*/
if (rbio->raid_map[failb] == RAID6_Q_STRIPE) {
if (rbio->raid_map[faila] == RAID5_P_STRIPE) {
if (rbio->bbio->raid_map[failb] == RAID6_Q_STRIPE) {
if (rbio->bbio->raid_map[faila] ==
RAID5_P_STRIPE) {
err = -EIO;
goto cleanup;
}
@ -1934,7 +1923,7 @@ static void __raid_recover_end_io(struct btrfs_raid_bio *rbio)
goto pstripe;
}
if (rbio->raid_map[failb] == RAID5_P_STRIPE) {
if (rbio->bbio->raid_map[failb] == RAID5_P_STRIPE) {
raid6_datap_recov(rbio->real_stripes,
PAGE_SIZE, faila, pointers);
} else {
@ -2156,15 +2145,15 @@ cleanup:
* of the drive.
*/
int raid56_parity_recover(struct btrfs_root *root, struct bio *bio,
struct btrfs_bio *bbio, u64 *raid_map,
u64 stripe_len, int mirror_num, int generic_io)
struct btrfs_bio *bbio, u64 stripe_len,
int mirror_num, int generic_io)
{
struct btrfs_raid_bio *rbio;
int ret;
rbio = alloc_rbio(root, bbio, raid_map, stripe_len);
rbio = alloc_rbio(root, bbio, stripe_len);
if (IS_ERR(rbio)) {
__free_bbio_and_raid_map(bbio, raid_map, generic_io);
__free_bbio(bbio, generic_io);
return PTR_ERR(rbio);
}
@ -2175,7 +2164,7 @@ int raid56_parity_recover(struct btrfs_root *root, struct bio *bio,
rbio->faila = find_logical_bio_stripe(rbio, bio);
if (rbio->faila == -1) {
BUG();
__free_bbio_and_raid_map(bbio, raid_map, generic_io);
__free_bbio(bbio, generic_io);
kfree(rbio);
return -EIO;
}
@ -2240,14 +2229,14 @@ static void read_rebuild_work(struct btrfs_work *work)
struct btrfs_raid_bio *
raid56_parity_alloc_scrub_rbio(struct btrfs_root *root, struct bio *bio,
struct btrfs_bio *bbio, u64 *raid_map,
u64 stripe_len, struct btrfs_device *scrub_dev,
struct btrfs_bio *bbio, u64 stripe_len,
struct btrfs_device *scrub_dev,
unsigned long *dbitmap, int stripe_nsectors)
{
struct btrfs_raid_bio *rbio;
int i;
rbio = alloc_rbio(root, bbio, raid_map, stripe_len);
rbio = alloc_rbio(root, bbio, stripe_len);
if (IS_ERR(rbio))
return NULL;
bio_list_add(&rbio->bio_list, bio);
@ -2279,10 +2268,10 @@ void raid56_parity_add_scrub_pages(struct btrfs_raid_bio *rbio,
int stripe_offset;
int index;
ASSERT(logical >= rbio->raid_map[0]);
ASSERT(logical + PAGE_SIZE <= rbio->raid_map[0] +
ASSERT(logical >= rbio->bbio->raid_map[0]);
ASSERT(logical + PAGE_SIZE <= rbio->bbio->raid_map[0] +
rbio->stripe_len * rbio->nr_data);
stripe_offset = (int)(logical - rbio->raid_map[0]);
stripe_offset = (int)(logical - rbio->bbio->raid_map[0]);
index = stripe_offset >> PAGE_CACHE_SHIFT;
rbio->bio_pages[index] = page;
}

11
fs/btrfs/raid56.h
View File

@ -43,16 +43,15 @@ struct btrfs_raid_bio;
struct btrfs_device;
int raid56_parity_recover(struct btrfs_root *root, struct bio *bio,
struct btrfs_bio *bbio, u64 *raid_map,
u64 stripe_len, int mirror_num, int generic_io);
struct btrfs_bio *bbio, u64 stripe_len,
int mirror_num, int generic_io);
int raid56_parity_write(struct btrfs_root *root, struct bio *bio,
struct btrfs_bio *bbio, u64 *raid_map,
u64 stripe_len);
struct btrfs_bio *bbio, u64 stripe_len);
struct btrfs_raid_bio *
raid56_parity_alloc_scrub_rbio(struct btrfs_root *root, struct bio *bio,
struct btrfs_bio *bbio, u64 *raid_map,
u64 stripe_len, struct btrfs_device *scrub_dev,
struct btrfs_bio *bbio, u64 stripe_len,
struct btrfs_device *scrub_dev,
unsigned long *dbitmap, int stripe_nsectors);
void raid56_parity_add_scrub_pages(struct btrfs_raid_bio *rbio,
struct page *page, u64 logical);

31
fs/btrfs/scrub.c
View File

@ -66,7 +66,6 @@ struct scrub_ctx;
struct scrub_recover {
atomic_t refs;
struct btrfs_bio *bbio;
u64 *raid_map;
u64 map_length;
};
@ -857,7 +856,6 @@ static inline void scrub_put_recover(struct scrub_recover *recover)
{
if (atomic_dec_and_test(&recover->refs)) {
kfree(recover->bbio);
kfree(recover->raid_map);
kfree(recover);
}
}
@ -1296,12 +1294,12 @@ out:
return 0;
}
static inline int scrub_nr_raid_mirrors(struct btrfs_bio *bbio, u64 *raid_map)
static inline int scrub_nr_raid_mirrors(struct btrfs_bio *bbio)
{
if (raid_map) {
if (bbio->raid_map) {
int real_stripes = bbio->num_stripes - bbio->num_tgtdevs;
if (raid_map[real_stripes - 1] == RAID6_Q_STRIPE)
if (bbio->raid_map[real_stripes - 1] == RAID6_Q_STRIPE)
return 3;
else
return 2;
@ -1347,7 +1345,6 @@ static int scrub_setup_recheck_block(struct scrub_ctx *sctx,
{
struct scrub_recover *recover;
struct btrfs_bio *bbio;
u64 *raid_map;
u64 sublen;
u64 mapped_length;
u64 stripe_offset;
@ -1368,35 +1365,31 @@ static int scrub_setup_recheck_block(struct scrub_ctx *sctx,
sublen = min_t(u64, length, PAGE_SIZE);
mapped_length = sublen;
bbio = NULL;
raid_map = NULL;
/*
* with a length of PAGE_SIZE, each returned stripe
* represents one mirror
*/
ret = btrfs_map_sblock(fs_info, REQ_GET_READ_MIRRORS, logical,
&mapped_length, &bbio, 0, &raid_map);
&mapped_length, &bbio, 0, 1);
if (ret || !bbio || mapped_length < sublen) {
kfree(bbio);
kfree(raid_map);
return -EIO;
}
recover = kzalloc(sizeof(struct scrub_recover), GFP_NOFS);
if (!recover) {
kfree(bbio);
kfree(raid_map);
return -ENOMEM;
}
atomic_set(&recover->refs, 1);
recover->bbio = bbio;
recover->raid_map = raid_map;
recover->map_length = mapped_length;
BUG_ON(page_index >= SCRUB_PAGES_PER_RD_BIO);
nmirrors = scrub_nr_raid_mirrors(bbio, raid_map);
nmirrors = scrub_nr_raid_mirrors(bbio);
for (mirror_index = 0; mirror_index < nmirrors;
mirror_index++) {
struct scrub_block *sblock;
@ -1420,7 +1413,7 @@ leave_nomem:
sblock->pagev[page_index] = page;
page->logical = logical;
scrub_stripe_index_and_offset(logical, raid_map,
scrub_stripe_index_and_offset(logical, bbio->raid_map,
mapped_length,
bbio->num_stripes -
bbio->num_tgtdevs,
@ -1469,7 +1462,7 @@ static void scrub_bio_wait_endio(struct bio *bio, int error)
static inline int scrub_is_page_on_raid56(struct scrub_page *page)
{
return page->recover && page->recover->raid_map;
return page->recover && page->recover->bbio->raid_map;
}
static int scrub_submit_raid56_bio_wait(struct btrfs_fs_info *fs_info,
@ -1486,7 +1479,6 @@ static int scrub_submit_raid56_bio_wait(struct btrfs_fs_info *fs_info,
bio->bi_end_io = scrub_bio_wait_endio;
ret = raid56_parity_recover(fs_info->fs_root, bio, page->recover->bbio,
page->recover->raid_map,
page->recover->map_length,
page->mirror_num, 0);
if (ret)
@ -2716,7 +2708,6 @@ static void scrub_parity_check_and_repair(struct scrub_parity *sparity)
struct btrfs_raid_bio *rbio;
struct scrub_page *spage;
struct btrfs_bio *bbio = NULL;
u64 *raid_map = NULL;
u64 length;
int ret;
@ -2727,8 +2718,8 @@ static void scrub_parity_check_and_repair(struct scrub_parity *sparity)
length = sparity->logic_end - sparity->logic_start + 1;
ret = btrfs_map_sblock(sctx->dev_root->fs_info, WRITE,
sparity->logic_start,
&length, &bbio, 0, &raid_map);
if (ret || !bbio || !raid_map)
&length, &bbio, 0, 1);
if (ret || !bbio || !bbio->raid_map)
goto bbio_out;
bio = btrfs_io_bio_alloc(GFP_NOFS, 0);
@ -2740,8 +2731,7 @@ static void scrub_parity_check_and_repair(struct scrub_parity *sparity)
bio->bi_end_io = scrub_parity_bio_endio;
rbio = raid56_parity_alloc_scrub_rbio(sctx->dev_root, bio, bbio,
raid_map, length,
sparity->scrub_dev,
length, sparity->scrub_dev,
sparity->dbitmap,
sparity->nsectors);
if (!rbio)
@ -2759,7 +2749,6 @@ rbio_out:
bio_put(bio);
bbio_out:
kfree(bbio);
kfree(raid_map);
bitmap_or(sparity->ebitmap, sparity->ebitmap, sparity->dbitmap,
sparity->nsectors);
spin_lock(&sctx->stat_lock);

100
fs/btrfs/volumes.c
View File

@ -4876,8 +4876,7 @@ static inline int parity_smaller(u64 a, u64 b)
}
/* Bubble-sort the stripe set to put the parity/syndrome stripes last */
static void sort_parity_stripes(struct btrfs_bio *bbio, u64 *raid_map,
int num_stripes)
static void sort_parity_stripes(struct btrfs_bio *bbio, int num_stripes)
{
struct btrfs_bio_stripe s;
int i;
@ -4887,13 +4886,14 @@ static void sort_parity_stripes(struct btrfs_bio *bbio, u64 *raid_map,
while (again) {
again = 0;
for (i = 0; i < num_stripes - 1; i++) {
if (parity_smaller(raid_map[i], raid_map[i+1])) {
if (parity_smaller(bbio->raid_map[i],
bbio->raid_map[i+1])) {
s = bbio->stripes[i];
l = raid_map[i];
l = bbio->raid_map[i];
bbio->stripes[i] = bbio->stripes[i+1];
raid_map[i] = raid_map[i+1];
bbio->raid_map[i] = bbio->raid_map[i+1];
bbio->stripes[i+1] = s;
raid_map[i+1] = l;
bbio->raid_map[i+1] = l;
again = 1;
}
@ -4904,7 +4904,7 @@ static void sort_parity_stripes(struct btrfs_bio *bbio, u64 *raid_map,
static int __btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
u64 logical, u64 *length,
struct btrfs_bio **bbio_ret,
int mirror_num, u64 **raid_map_ret)
int mirror_num, int need_raid_map)
{
struct extent_map *em;
struct map_lookup *map;
@ -4917,7 +4917,6 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
u64 stripe_nr_orig;
u64 stripe_nr_end;
u64 stripe_len;
u64 *raid_map = NULL;
int stripe_index;
int i;
int ret = 0;
@ -5039,7 +5038,7 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
u64 physical_of_found = 0;
ret = __btrfs_map_block(fs_info, REQ_GET_READ_MIRRORS,
logical, &tmp_length, &tmp_bbio, 0, NULL);
logical, &tmp_length, &tmp_bbio, 0, 0);
if (ret) {
WARN_ON(tmp_bbio != NULL);
goto out;
@ -5160,13 +5159,9 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
} else if (map->type & (BTRFS_BLOCK_GROUP_RAID5 |
BTRFS_BLOCK_GROUP_RAID6)) {
u64 tmp;
if (raid_map_ret &&
if (need_raid_map &&
((rw & (REQ_WRITE | REQ_GET_READ_MIRRORS)) ||
mirror_num > 1)) {
int i, rot;
/* push stripe_nr back to the start of the full stripe */
stripe_nr = raid56_full_stripe_start;
do_div(stripe_nr, stripe_len * nr_data_stripes(map));
@ -5175,32 +5170,12 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
num_stripes = map->num_stripes;
max_errors = nr_parity_stripes(map);
raid_map = kmalloc_array(num_stripes, sizeof(u64),
GFP_NOFS);
if (!raid_map) {
ret = -ENOMEM;
goto out;
}
/* Work out the disk rotation on this stripe-set */
tmp = stripe_nr;
rot = do_div(tmp, num_stripes);
/* Fill in the logical address of each stripe */
tmp = stripe_nr * nr_data_stripes(map);
for (i = 0; i < nr_data_stripes(map); i++)
raid_map[(i+rot) % num_stripes] =
em->start + (tmp + i) * map->stripe_len;
raid_map[(i+rot) % map->num_stripes] = RAID5_P_STRIPE;
if (map->type & BTRFS_BLOCK_GROUP_RAID6)
raid_map[(i+rot+1) % num_stripes] =
RAID6_Q_STRIPE;
*length = map->stripe_len;
stripe_index = 0;
stripe_offset = 0;
} else {
u64 tmp;
/*
* Mirror #0 or #1 means the original data block.
* Mirror #2 is RAID5 parity block.
@ -5241,7 +5216,6 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
bbio = kzalloc(btrfs_bio_size(num_alloc_stripes, tgtdev_indexes),
GFP_NOFS);
if (!bbio) {
kfree(raid_map);
ret = -ENOMEM;
goto out;
}
@ -5249,6 +5223,34 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
if (dev_replace_is_ongoing)
bbio->tgtdev_map = (int *)(bbio->stripes + num_alloc_stripes);
/* build raid_map */
if (map->type & (BTRFS_BLOCK_GROUP_RAID5 | BTRFS_BLOCK_GROUP_RAID6) &&
need_raid_map && ((rw & (REQ_WRITE | REQ_GET_READ_MIRRORS)) ||
mirror_num > 1)) {
u64 tmp;
int i, rot;
bbio->raid_map = (u64 *)((void *)bbio->stripes +
sizeof(struct btrfs_bio_stripe) *
num_alloc_stripes +
sizeof(int) * tgtdev_indexes);
/* Work out the disk rotation on this stripe-set */
tmp = stripe_nr;
rot = do_div(tmp, num_stripes);
/* Fill in the logical address of each stripe */
tmp = stripe_nr * nr_data_stripes(map);
for (i = 0; i < nr_data_stripes(map); i++)
bbio->raid_map[(i+rot) % num_stripes] =
em->start + (tmp + i) * map->stripe_len;
bbio->raid_map[(i+rot) % map->num_stripes] = RAID5_P_STRIPE;
if (map->type & BTRFS_BLOCK_GROUP_RAID6)
bbio->raid_map[(i+rot+1) % num_stripes] =
RAID6_Q_STRIPE;
}
if (rw & REQ_DISCARD) {
int factor = 0;
int sub_stripes = 0;
@ -5332,8 +5334,8 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
if (rw & (REQ_WRITE | REQ_GET_READ_MIRRORS))
max_errors = btrfs_chunk_max_errors(map);
if (raid_map)
sort_parity_stripes(bbio, raid_map, num_stripes);
if (bbio->raid_map)
sort_parity_stripes(bbio, num_stripes);
tgtdev_indexes = 0;
if (dev_replace_is_ongoing && (rw & (REQ_WRITE | REQ_DISCARD)) &&
@ -5438,9 +5440,6 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
bbio->stripes[0].physical = physical_to_patch_in_first_stripe;
bbio->mirror_num = map->num_stripes + 1;
}
if (raid_map_ret)
*raid_map_ret = raid_map;
out:
if (dev_replace_is_ongoing)
btrfs_dev_replace_unlock(dev_replace);
@ -5453,17 +5452,17 @@ int btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
struct btrfs_bio **bbio_ret, int mirror_num)
{
return __btrfs_map_block(fs_info, rw, logical, length, bbio_ret,
mirror_num, NULL);
mirror_num, 0);
}
/* For Scrub/replace */
int btrfs_map_sblock(struct btrfs_fs_info *fs_info, int rw,
u64 logical, u64 *length,
struct btrfs_bio **bbio_ret, int mirror_num,
u64 **raid_map_ret)
int need_raid_map)
{
return __btrfs_map_block(fs_info, rw, logical, length, bbio_ret,
mirror_num, raid_map_ret);
mirror_num, need_raid_map);
}
int btrfs_rmap_block(struct btrfs_mapping_tree *map_tree,
@ -5802,7 +5801,6 @@ int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio,
u64 logical = (u64)bio->bi_iter.bi_sector << 9;
u64 length = 0;
u64 map_length;
u64 *raid_map = NULL;
int ret;
int dev_nr = 0;
int total_devs = 1;
@ -5813,7 +5811,7 @@ int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio,
btrfs_bio_counter_inc_blocked(root->fs_info);
ret = __btrfs_map_block(root->fs_info, rw, logical, &map_length, &bbio,
mirror_num, &raid_map);
mirror_num, 1);
if (ret) {
btrfs_bio_counter_dec(root->fs_info);
return ret;
@ -5826,15 +5824,13 @@ int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio,
bbio->fs_info = root->fs_info;
atomic_set(&bbio->stripes_pending, bbio->num_stripes);
if (raid_map) {
if (bbio->raid_map) {
/* In this case, map_length has been set to the length of
a single stripe; not the whole write */
if (rw & WRITE) {
ret = raid56_parity_write(root, bio, bbio,
raid_map, map_length);
ret = raid56_parity_write(root, bio, bbio, map_length);
} else {
ret = raid56_parity_recover(root, bio, bbio,
raid_map, map_length,
ret = raid56_parity_recover(root, bio, bbio, map_length,
mirror_num, 1);
}

11
fs/btrfs/volumes.h
View File

@ -307,6 +307,12 @@ struct btrfs_bio {
int mirror_num;
int num_tgtdevs;
int *tgtdev_map;
/*
* logical block numbers for the start of each stripe
* The last one or two are p/q. These are sorted,
* so raid_map[0] is the start of our full stripe
*/
u64 *raid_map;
struct btrfs_bio_stripe stripes[];
};
@ -392,7 +398,8 @@ int btrfs_account_dev_extents_size(struct btrfs_device *device, u64 start,
#define btrfs_bio_size(total_stripes, real_stripes) \
(sizeof(struct btrfs_bio) + \
(sizeof(struct btrfs_bio_stripe) * (total_stripes)) + \
(sizeof(int) * (real_stripes)))
(sizeof(int) * (real_stripes)) + \
(sizeof(u64) * (real_stripes)))
int btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
u64 logical, u64 *length,
@ -400,7 +407,7 @@ int btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
int btrfs_map_sblock(struct btrfs_fs_info *fs_info, int rw,
u64 logical, u64 *length,
struct btrfs_bio **bbio_ret, int mirror_num,
u64 **raid_map_ret);
int need_raid_map);
int btrfs_rmap_block(struct btrfs_mapping_tree *map_tree,
u64 chunk_start, u64 physical, u64 devid,
u64 **logical, int *naddrs, int *stripe_len);