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;
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,
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);