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btrfs: raid56: make finish_rmw() subpage compatible 

With this function converted to subpage compatible sector interfaces,
the following helper functions can be removed:

- rbio_stripe_page()
- rbio_pstripe_page()
- rbio_qstripe_page()
- page_in_rbio()

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 19:23:24 +08:00 committed by David Sterba
parent 07e4d38080
commit 1145059ae5
1 changed files with 33 additions and 78 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

111
fs/btrfs/raid56.c
View File

@ -685,39 +685,25 @@ static struct sector_ptr *rbio_stripe_sector(const struct btrfs_raid_bio *rbio,
sector_nr)];
}
static int rbio_stripe_page_index(struct btrfs_raid_bio *rbio, int stripe,
int index)
/* Grab a sector inside P stripe */
static struct sector_ptr *rbio_pstripe_sector(const struct btrfs_raid_bio *rbio,
unsigned int sector_nr)
{
return stripe * rbio->stripe_npages + index;
return rbio_stripe_sector(rbio, rbio->nr_data, sector_nr);
}
/*
* these are just the pages from the rbio array, not from anything
* the FS sent down to us
*/
static struct page *rbio_stripe_page(struct btrfs_raid_bio *rbio, int stripe,
int index)
{
return rbio->stripe_pages[rbio_stripe_page_index(rbio, stripe, index)];
}
/*
* helper to index into the pstripe
*/
static struct page *rbio_pstripe_page(struct btrfs_raid_bio *rbio, int index)
{
return rbio_stripe_page(rbio, rbio->nr_data, index);
}
/*
* helper to index into the qstripe, returns null
* if there is no qstripe
*/
static struct page *rbio_qstripe_page(struct btrfs_raid_bio *rbio, int index)
/* Grab a sector inside Q stripe, return NULL if not RAID6 */
static struct sector_ptr *rbio_qstripe_sector(const struct btrfs_raid_bio *rbio,
unsigned int sector_nr)
{
if (rbio->nr_data + 1 == rbio->real_stripes)
return NULL;
return rbio_stripe_page(rbio, rbio->nr_data + 1, index);
return rbio_stripe_sector(rbio, rbio->nr_data + 1, sector_nr);
}
static int rbio_stripe_page_index(struct btrfs_raid_bio *rbio, int stripe, int index)
{
return stripe * rbio->stripe_npages + index;
}
/*
@ -1035,40 +1021,6 @@ static struct sector_ptr *sector_in_rbio(struct btrfs_raid_bio *rbio,
return &rbio->stripe_sectors[index];
}
/*
* the read/modify/write code wants to use the original bio for
* any pages it included, and then use the rbio for everything
* else. This function decides if a given index (stripe number)
* and page number in that stripe fall inside the original bio
* or the rbio.
*
* if you set bio_list_only, you'll get a NULL back for any ranges
* that are outside the bio_list
*
* This doesn't take any refs on anything, you get a bare page pointer
* and the caller must bump refs as required.
*
* You must call index_rbio_pages once before you can trust
* the answers from this function.
*/
static struct page *page_in_rbio(struct btrfs_raid_bio *rbio,
int index, int pagenr, int bio_list_only)
{
int chunk_page;
struct page *p = NULL;
chunk_page = index * (rbio->stripe_len >> PAGE_SHIFT) + pagenr;
spin_lock_irq(&rbio->bio_list_lock);
p = rbio->bio_pages[chunk_page];
spin_unlock_irq(&rbio->bio_list_lock);
if (p || bio_list_only)
return p;
return rbio->stripe_pages[chunk_page];
}
/*
* allocation and initial setup for the btrfs_raid_bio. Not
* this does not allocate any pages for rbio->pages.
@ -1336,6 +1288,7 @@ static void index_rbio_pages(struct btrfs_raid_bio *rbio)
static noinline void finish_rmw(struct btrfs_raid_bio *rbio)
{
struct btrfs_io_context *bioc = rbio->bioc;
const u32 sectorsize = bioc->fs_info->sectorsize;
void **pointers = rbio->finish_pointers;
int nr_data = rbio->nr_data;
int stripe;
@ -1384,34 +1337,36 @@ static noinline void finish_rmw(struct btrfs_raid_bio *rbio)
clear_bit(RBIO_CACHE_READY_BIT, &rbio->flags);
for (sectornr = 0; sectornr < rbio->stripe_nsectors; sectornr++) {
struct page *p;
/* first collect one page from each data stripe */
struct sector_ptr *sector;
/* First collect one sector from each data stripe */
for (stripe = 0; stripe < nr_data; stripe++) {
p = page_in_rbio(rbio, stripe, sectornr, 0);
pointers[stripe] = kmap_local_page(p);
sector = sector_in_rbio(rbio, stripe, sectornr, 0);
pointers[stripe] = kmap_local_page(sector->page) +
sector->pgoff;
}
/* then add the parity stripe */
p = rbio_pstripe_page(rbio, sectornr);
SetPageUptodate(p);
pointers[stripe++] = kmap_local_page(p);
/* Then add the parity stripe */
sector = rbio_pstripe_sector(rbio, sectornr);
sector->uptodate = 1;
pointers[stripe++] = kmap_local_page(sector->page) + sector->pgoff;
if (has_qstripe) {
/*
* raid6, add the qstripe and call the
* library function to fill in our p/q
* RAID6, add the qstripe and call the library function
* to fill in our p/q
*/
p = rbio_qstripe_page(rbio, sectornr);
SetPageUptodate(p);
pointers[stripe++] = kmap_local_page(p);
sector = rbio_qstripe_sector(rbio, sectornr);
sector->uptodate = 1;
pointers[stripe++] = kmap_local_page(sector->page) +
sector->pgoff;
raid6_call.gen_syndrome(rbio->real_stripes, PAGE_SIZE,
raid6_call.gen_syndrome(rbio->real_stripes, sectorsize,
pointers);
} else {
/* raid5 */
copy_page(pointers[nr_data], pointers[0]);
run_xor(pointers + 1, nr_data - 1, PAGE_SIZE);
memcpy(pointers[nr_data], pointers[0], sectorsize);
run_xor(pointers + 1, nr_data - 1, sectorsize);
}
for (stripe = stripe - 1; stripe >= 0; stripe--)
kunmap_local(pointers[stripe]);