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btrfs: raid56: extract rwm write bios assembly into a helper

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The helper will be later used to refactor the rmw write path.

Signed-off-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Qu Wenruo 2022-11-01 19:16:07 +08:00 committed by David Sterba
parent 509c27aa2f
commit 6486d21c99
1 changed files with 94 additions and 71 deletions
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165
fs/btrfs/raid56.c
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@ -1237,6 +1237,97 @@ static void generate_pq_vertical(struct btrfs_raid_bio *rbio, int sectornr)
kunmap_local(pointers[stripe]);
}
static int rmw_assemble_write_bios(struct btrfs_raid_bio *rbio,
struct bio_list *bio_list)
{
struct bio *bio;
/* The total sector number inside the full stripe. */
int total_sector_nr;
int sectornr;
int stripe;
int ret;
ASSERT(bio_list_size(bio_list) == 0);
/* We should have at least one data sector. */
ASSERT(bitmap_weight(&rbio->dbitmap, rbio->stripe_nsectors));
/*
* Start assembly. Make bios for everything from the higher layers (the
* bio_list in our rbio) and our P/Q. Ignore everything else.
*/
for (total_sector_nr = 0; total_sector_nr < rbio->nr_sectors;
total_sector_nr++) {
struct sector_ptr *sector;
stripe = total_sector_nr / rbio->stripe_nsectors;
sectornr = total_sector_nr % rbio->stripe_nsectors;
/* This vertical stripe has no data, skip it. */
if (!test_bit(sectornr, &rbio->dbitmap))
continue;
if (stripe < rbio->nr_data) {
sector = sector_in_rbio(rbio, stripe, sectornr, 1);
if (!sector)
continue;
} else {
sector = rbio_stripe_sector(rbio, stripe, sectornr);
}
ret = rbio_add_io_sector(rbio, bio_list, sector, stripe,
sectornr, REQ_OP_WRITE);
if (ret)
goto error;
}
if (likely(!rbio->bioc->num_tgtdevs))
return 0;
/* Make a copy for the replace target device. */
for (total_sector_nr = 0; total_sector_nr < rbio->nr_sectors;
total_sector_nr++) {
struct sector_ptr *sector;
stripe = total_sector_nr / rbio->stripe_nsectors;
sectornr = total_sector_nr % rbio->stripe_nsectors;
if (!rbio->bioc->tgtdev_map[stripe]) {
/*
* We can skip the whole stripe completely, note
* total_sector_nr will be increased by one anyway.
*/
ASSERT(sectornr == 0);
total_sector_nr += rbio->stripe_nsectors - 1;
continue;
}
/* This vertical stripe has no data, skip it. */
if (!test_bit(sectornr, &rbio->dbitmap))
continue;
if (stripe < rbio->nr_data) {
sector = sector_in_rbio(rbio, stripe, sectornr, 1);
if (!sector)
continue;
} else {
sector = rbio_stripe_sector(rbio, stripe, sectornr);
}
ret = rbio_add_io_sector(rbio, bio_list, sector,
rbio->bioc->tgtdev_map[stripe],
sectornr, REQ_OP_WRITE);
if (ret)
goto error;
}
return 0;
error:
while ((bio = bio_list_pop(bio_list)))
bio_put(bio);
return -EIO;
}
/*
* this is called from one of two situations. We either
* have a full stripe from the higher layers, or we've read all
@ -1247,10 +1338,7 @@ static void generate_pq_vertical(struct btrfs_raid_bio *rbio, int sectornr)
*/
static noinline void finish_rmw(struct btrfs_raid_bio *rbio)
{
struct btrfs_io_context *bioc = rbio->bioc;
/* The total sector number inside the full stripe. */
int total_sector_nr;
int stripe;
/* Sector number inside a stripe. */
int sectornr;
struct bio_list bio_list;
@ -1294,75 +1382,10 @@ static noinline void finish_rmw(struct btrfs_raid_bio *rbio)
for (sectornr = 0; sectornr < rbio->stripe_nsectors; sectornr++)
generate_pq_vertical(rbio, sectornr);
/*
* Start writing. Make bios for everything from the higher layers (the
* bio_list in our rbio) and our P/Q. Ignore everything else.
*/
for (total_sector_nr = 0; total_sector_nr < rbio->nr_sectors;
total_sector_nr++) {
struct sector_ptr *sector;
ret = rmw_assemble_write_bios(rbio, &bio_list);
if (ret < 0)
goto cleanup;
stripe = total_sector_nr / rbio->stripe_nsectors;
sectornr = total_sector_nr % rbio->stripe_nsectors;
/* This vertical stripe has no data, skip it. */
if (!test_bit(sectornr, &rbio->dbitmap))
continue;
if (stripe < rbio->nr_data) {
sector = sector_in_rbio(rbio, stripe, sectornr, 1);
if (!sector)
continue;
} else {
sector = rbio_stripe_sector(rbio, stripe, sectornr);
}
ret = rbio_add_io_sector(rbio, &bio_list, sector, stripe,
sectornr, REQ_OP_WRITE);
if (ret)
goto cleanup;
}
if (likely(!bioc->num_tgtdevs))
goto write_data;
for (total_sector_nr = 0; total_sector_nr < rbio->nr_sectors;
total_sector_nr++) {
struct sector_ptr *sector;
stripe = total_sector_nr / rbio->stripe_nsectors;
sectornr = total_sector_nr % rbio->stripe_nsectors;
if (!bioc->tgtdev_map[stripe]) {
/*
* We can skip the whole stripe completely, note
* total_sector_nr will be increased by one anyway.
*/
ASSERT(sectornr == 0);
total_sector_nr += rbio->stripe_nsectors - 1;
continue;
}
/* This vertical stripe has no data, skip it. */
if (!test_bit(sectornr, &rbio->dbitmap))
continue;
if (stripe < rbio->nr_data) {
sector = sector_in_rbio(rbio, stripe, sectornr, 1);
if (!sector)
continue;
} else {
sector = rbio_stripe_sector(rbio, stripe, sectornr);
}
ret = rbio_add_io_sector(rbio, &bio_list, sector,
rbio->bioc->tgtdev_map[stripe],
sectornr, REQ_OP_WRITE);
if (ret)
goto cleanup;
}
write_data:
atomic_set(&rbio->stripes_pending, bio_list_size(&bio_list));
BUG_ON(atomic_read(&rbio->stripes_pending) == 0);