diff options
Diffstat (limited to 'fs/btrfs/compression.c')
| -rw-r--r-- | fs/btrfs/compression.c | 78 |
1 files changed, 53 insertions, 25 deletions
diff --git a/fs/btrfs/compression.c b/fs/btrfs/compression.c index 5ae3fa0386b7..3f4c832abfed 100644 --- a/fs/btrfs/compression.c +++ b/fs/btrfs/compression.c @@ -141,6 +141,7 @@ static int check_compressed_csum(struct btrfs_inode *inode, struct bio *bio, struct btrfs_fs_info *fs_info = inode->root->fs_info; SHASH_DESC_ON_STACK(shash, fs_info->csum_shash); const u32 csum_size = fs_info->csum_size; + const u32 sectorsize = fs_info->sectorsize; struct page *page; unsigned long i; char *kaddr; @@ -154,22 +155,34 @@ static int check_compressed_csum(struct btrfs_inode *inode, struct bio *bio, shash->tfm = fs_info->csum_shash; for (i = 0; i < cb->nr_pages; i++) { + u32 pg_offset; + u32 bytes_left = PAGE_SIZE; page = cb->compressed_pages[i]; - kaddr = kmap_atomic(page); - crypto_shash_digest(shash, kaddr, PAGE_SIZE, csum); - kunmap_atomic(kaddr); - - if (memcmp(&csum, cb_sum, csum_size)) { - btrfs_print_data_csum_error(inode, disk_start, - csum, cb_sum, cb->mirror_num); - if (btrfs_io_bio(bio)->device) - btrfs_dev_stat_inc_and_print( - btrfs_io_bio(bio)->device, - BTRFS_DEV_STAT_CORRUPTION_ERRS); - return -EIO; + /* Determine the remaining bytes inside the page first */ + if (i == cb->nr_pages - 1) + bytes_left = cb->compressed_len - i * PAGE_SIZE; + + /* Hash through the page sector by sector */ + for (pg_offset = 0; pg_offset < bytes_left; + pg_offset += sectorsize) { + kaddr = kmap_atomic(page); + crypto_shash_digest(shash, kaddr + pg_offset, + sectorsize, csum); + kunmap_atomic(kaddr); + + if (memcmp(&csum, cb_sum, csum_size) != 0) { + btrfs_print_data_csum_error(inode, disk_start, + csum, cb_sum, cb->mirror_num); + if (btrfs_io_bio(bio)->device) + btrfs_dev_stat_inc_and_print( + btrfs_io_bio(bio)->device, + BTRFS_DEV_STAT_CORRUPTION_ERRS); + return -EIO; + } + cb_sum += csum_size; + disk_start += sectorsize; } - cb_sum += csum_size; } return 0; } @@ -542,13 +555,19 @@ static noinline int add_ra_bio_pages(struct inode *inode, goto next; } - end = last_offset + PAGE_SIZE - 1; /* * at this point, we have a locked page in the page cache * for these bytes in the file. But, we have to make * sure they map to this compressed extent on disk. */ - set_page_extent_mapped(page); + ret = set_page_extent_mapped(page); + if (ret < 0) { + unlock_page(page); + put_page(page); + break; + } + + end = last_offset + PAGE_SIZE - 1; lock_extent(tree, last_offset, end); read_lock(&em_tree->lock); em = lookup_extent_mapping(em_tree, last_offset, @@ -634,7 +653,7 @@ blk_status_t btrfs_submit_compressed_read(struct inode *inode, struct bio *bio, read_lock(&em_tree->lock); em = lookup_extent_mapping(em_tree, page_offset(bio_first_page_all(bio)), - PAGE_SIZE); + fs_info->sectorsize); read_unlock(&em_tree->lock); if (!em) return BLK_STS_IOERR; @@ -692,19 +711,30 @@ blk_status_t btrfs_submit_compressed_read(struct inode *inode, struct bio *bio, refcount_set(&cb->pending_bios, 1); for (pg_index = 0; pg_index < nr_pages; pg_index++) { + u32 pg_len = PAGE_SIZE; int submit = 0; + /* + * To handle subpage case, we need to make sure the bio only + * covers the range we need. + * + * If we're at the last page, truncate the length to only cover + * the remaining part. + */ + if (pg_index == nr_pages - 1) + pg_len = min_t(u32, PAGE_SIZE, + compressed_len - pg_index * PAGE_SIZE); + page = cb->compressed_pages[pg_index]; page->mapping = inode->i_mapping; page->index = em_start >> PAGE_SHIFT; if (comp_bio->bi_iter.bi_size) - submit = btrfs_bio_fits_in_stripe(page, PAGE_SIZE, + submit = btrfs_bio_fits_in_stripe(page, pg_len, comp_bio, 0); page->mapping = NULL; - if (submit || bio_add_page(comp_bio, page, PAGE_SIZE, 0) < - PAGE_SIZE) { + if (submit || bio_add_page(comp_bio, page, pg_len, 0) < pg_len) { unsigned int nr_sectors; ret = btrfs_bio_wq_end_io(fs_info, comp_bio, @@ -737,9 +767,9 @@ blk_status_t btrfs_submit_compressed_read(struct inode *inode, struct bio *bio, comp_bio->bi_private = cb; comp_bio->bi_end_io = end_compressed_bio_read; - bio_add_page(comp_bio, page, PAGE_SIZE, 0); + bio_add_page(comp_bio, page, pg_len, 0); } - cur_disk_byte += PAGE_SIZE; + cur_disk_byte += pg_len; } ret = btrfs_bio_wq_end_io(fs_info, comp_bio, BTRFS_WQ_ENDIO_DATA); @@ -1231,7 +1261,6 @@ int btrfs_decompress_buf2page(const char *buf, unsigned long buf_start, unsigned long prev_start_byte; unsigned long working_bytes = total_out - buf_start; unsigned long bytes; - char *kaddr; struct bio_vec bvec = bio_iter_iovec(bio, bio->bi_iter); /* @@ -1262,9 +1291,8 @@ int btrfs_decompress_buf2page(const char *buf, unsigned long buf_start, PAGE_SIZE - (buf_offset % PAGE_SIZE)); bytes = min(bytes, working_bytes); - kaddr = kmap_atomic(bvec.bv_page); - memcpy(kaddr + bvec.bv_offset, buf + buf_offset, bytes); - kunmap_atomic(kaddr); + memcpy_to_page(bvec.bv_page, bvec.bv_offset, buf + buf_offset, + bytes); flush_dcache_page(bvec.bv_page); buf_offset += bytes; |