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btrfs: raid56: make alloc_rbio_essential_pages() subpage compatible

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The non-compatible part is only the bitmap iteration part, now the
bitmap size is extended to rbio::stripe_nsectors, not the old
rbio::stripe_npages.

Since we're here, also slightly improve the function by:

- Rename @i to @stripe
- Rename @bit to @sectornr
- Move @page and @index into the inner loop

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 19:23:30 +08:00 committed by David Sterba
parent d4e28d9b5f
commit 3907ce293d
1 changed files with 9 additions and 7 deletions
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16
fs/btrfs/raid56.c
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@ -2415,14 +2415,16 @@ void raid56_add_scrub_pages(struct btrfs_raid_bio *rbio, struct page *page,
*/
static int alloc_rbio_essential_pages(struct btrfs_raid_bio *rbio)
{
int i;
int bit;
int index;
struct page *page;
const u32 sectorsize = rbio->bioc->fs_info->sectorsize;
int stripe;
int sectornr;
for_each_set_bit(sectornr, rbio->dbitmap, rbio->stripe_nsectors) {
for (stripe = 0; stripe < rbio->real_stripes; stripe++) {
struct page *page;
int index = (stripe * rbio->stripe_nsectors + sectornr) *
sectorsize >> PAGE_SHIFT;
for_each_set_bit(bit, rbio->dbitmap, rbio->stripe_npages) {
for (i = 0; i < rbio->real_stripes; i++) {
index = i * rbio->stripe_npages + bit;
if (rbio->stripe_pages[index])
continue;