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btrfs: raid56: avoid double for loop inside raid56_parity_scrub_stripe() 

Originally it's iterating all the sectors which has dbitmap sector for
the vertical stripe.

It can be easily converted to sector bytenr iteration with an test_bit()
call.

Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Qu Wenruo 2022-06-08 08:34:36 +08:00 committed by David Sterba
parent 550cdeb3e0
commit 1c10702e7c
1 changed files with 31 additions and 31 deletions
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62
fs/btrfs/raid56.c
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@ -2661,8 +2661,7 @@ static void raid56_parity_scrub_stripe(struct btrfs_raid_bio *rbio)
int bios_to_read = 0;
struct bio_list bio_list;
int ret;
int sectornr;
int stripe;
int total_sector_nr;
struct bio *bio;
bio_list_init(&bio_list);
@ -2672,37 +2671,38 @@ static void raid56_parity_scrub_stripe(struct btrfs_raid_bio *rbio)
goto cleanup;
atomic_set(&rbio->error, 0);
/*
* build a list of bios to read all the missing parts of this
* stripe
*/
for (stripe = 0; stripe < rbio->real_stripes; stripe++) {
for_each_set_bit(sectornr, &rbio->dbitmap, rbio->stripe_nsectors) {
struct sector_ptr *sector;
/*
* We want to find all the sectors missing from the
* rbio and read them from the disk. If * sector_in_rbio()
* finds a sector in the bio list we don't need to read
* it off the stripe.
*/
sector = sector_in_rbio(rbio, stripe, sectornr, 1);
if (sector)
continue;
/* Build a list of bios to read all the missing parts. */
for (total_sector_nr = 0; total_sector_nr < rbio->nr_sectors;
total_sector_nr++) {
int sectornr = total_sector_nr % rbio->stripe_nsectors;
int stripe = total_sector_nr / rbio->stripe_nsectors;
struct sector_ptr *sector;
sector = rbio_stripe_sector(rbio, stripe, sectornr);
/*
* The bio cache may have handed us an uptodate sector.
* If so, be happy and use it.
*/
if (sector->uptodate)
continue;
/* No data in the vertical stripe, no need to read. */
if (!test_bit(sectornr, &rbio->dbitmap))
continue;
ret = rbio_add_io_sector(rbio, &bio_list, sector,
stripe, sectornr, rbio->stripe_len,
REQ_OP_READ);
if (ret)
goto cleanup;
}
/*
* We want to find all the sectors missing from the rbio and
* read them from the disk. If sector_in_rbio() finds a sector
* in the bio list we don't need to read it off the stripe.
*/
sector = sector_in_rbio(rbio, stripe, sectornr, 1);
if (sector)
continue;
sector = rbio_stripe_sector(rbio, stripe, sectornr);
/*
* The bio cache may have handed us an uptodate sector. If so,
* use it.
*/
if (sector->uptodate)
continue;
ret = rbio_add_io_sector(rbio, &bio_list, sector, stripe,
sectornr, rbio->stripe_len, REQ_OP_READ);
if (ret)
goto cleanup;
}
bios_to_read = bio_list_size(&bio_list);