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btrfs: raid56: make __raid_recover_endio_io() subpage compatible 

This involves:

- Use sector_ptr interface to grab the pointers

- Add sector->pgoff to pointers[]

- Rebuild data using sectorsize instead of PAGE_SIZE

- Use memcpy() to replace copy_page()

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 2022-04-01 19:23:23 +08:00 committed by David Sterba
parent 46900662d0
commit 07e4d38080
1 changed files with 28 additions and 23 deletions
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51
fs/btrfs/raid56.c
View File

@ -1932,14 +1932,18 @@ int raid56_parity_write(struct bio *bio, struct btrfs_io_context *bioc, u32 stri
*/
static void __raid_recover_end_io(struct btrfs_raid_bio *rbio)
{
int pagenr, stripe;
const u32 sectorsize = rbio->bioc->fs_info->sectorsize;
int sectornr, stripe;
void **pointers;
void **unmap_array;
int faila = -1, failb = -1;
struct page *page;
blk_status_t err;
int i;
/*
* This array stores the pointer for each sector, thus it has the extra
* pgoff value added from each sector
*/
pointers = kcalloc(rbio->real_stripes, sizeof(void *), GFP_NOFS);
if (!pointers) {
err = BLK_STS_RESOURCE;
@ -1968,43 +1972,44 @@ static void __raid_recover_end_io(struct btrfs_raid_bio *rbio)
index_rbio_pages(rbio);
for (pagenr = 0; pagenr < rbio->stripe_npages; pagenr++) {
for (sectornr = 0; sectornr < rbio->stripe_nsectors; sectornr++) {
struct sector_ptr *sector;
/*
* Now we just use bitmap to mark the horizontal stripes in
* which we have data when doing parity scrub.
*/
if (rbio->operation == BTRFS_RBIO_PARITY_SCRUB &&
!test_bit(pagenr, rbio->dbitmap))
!test_bit(sectornr, rbio->dbitmap))
continue;
/*
* Setup our array of pointers with pages from each stripe
* Setup our array of pointers with sectors from each stripe
*
* NOTE: store a duplicate array of pointers to preserve the
* pointer order
*/
for (stripe = 0; stripe < rbio->real_stripes; stripe++) {
/*
* if we're rebuilding a read, we have to use
* If we're rebuilding a read, we have to use
* pages from the bio list
*/
if ((rbio->operation == BTRFS_RBIO_READ_REBUILD ||
rbio->operation == BTRFS_RBIO_REBUILD_MISSING) &&
(stripe == faila || stripe == failb)) {
page = page_in_rbio(rbio, stripe, pagenr, 0);
sector = sector_in_rbio(rbio, stripe, sectornr, 0);
} else {
page = rbio_stripe_page(rbio, stripe, pagenr);
sector = rbio_stripe_sector(rbio, stripe, sectornr);
}
pointers[stripe] = kmap_local_page(page);
ASSERT(sector->page);
pointers[stripe] = kmap_local_page(sector->page) +
sector->pgoff;
unmap_array[stripe] = pointers[stripe];
}
/* all raid6 handling here */
/* All raid6 handling here */
if (rbio->bioc->map_type & BTRFS_BLOCK_GROUP_RAID6) {
/*
* single failure, rebuild from parity raid5
* style
*/
/* Single failure, rebuild from parity raid5 style */
if (failb < 0) {
if (faila == rbio->nr_data) {
/*
@ -2047,10 +2052,10 @@ static void __raid_recover_end_io(struct btrfs_raid_bio *rbio)
if (rbio->bioc->raid_map[failb] == RAID5_P_STRIPE) {
raid6_datap_recov(rbio->real_stripes,
PAGE_SIZE, faila, pointers);
sectorsize, faila, pointers);
} else {
raid6_2data_recov(rbio->real_stripes,
PAGE_SIZE, faila, failb,
sectorsize, faila, failb,
pointers);
}
} else {
@ -2060,7 +2065,7 @@ static void __raid_recover_end_io(struct btrfs_raid_bio *rbio)
BUG_ON(failb != -1);
pstripe:
/* Copy parity block into failed block to start with */
copy_page(pointers[faila], pointers[rbio->nr_data]);
memcpy(pointers[faila], pointers[rbio->nr_data], sectorsize);
/* rearrange the pointer array */
p = pointers[faila];
@ -2069,7 +2074,7 @@ pstripe:
pointers[rbio->nr_data - 1] = p;
/* xor in the rest */
run_xor(pointers, rbio->nr_data - 1, PAGE_SIZE);
run_xor(pointers, rbio->nr_data - 1, sectorsize);
}
/* if we're doing this rebuild as part of an rmw, go through
* and set all of our private rbio pages in the
@ -2078,14 +2083,14 @@ pstripe:
* other endio functions will fiddle the uptodate bits
*/
if (rbio->operation == BTRFS_RBIO_WRITE) {
for (i = 0; i < rbio->stripe_npages; i++) {
for (i = 0; i < rbio->stripe_nsectors; i++) {
if (faila != -1) {
page = rbio_stripe_page(rbio, faila, i);
SetPageUptodate(page);
sector = rbio_stripe_sector(rbio, faila, i);
sector->uptodate = 1;
}
if (failb != -1) {
page = rbio_stripe_page(rbio, failb, i);
SetPageUptodate(page);
sector = rbio_stripe_sector(rbio, failb, i);
sector->uptodate = 1;
}
}
}