fs/squashfs/block.c

22 #include <linux/bio.h>
33 static int copy_bio_to_actor(struct bio *bio,
46 	if (WARN_ON_ONCE(!bio_next_segment(bio, &iter_all)))
70 			if (!bio_next_segment(bio, &iter_all))
79 static int squashfs_bio_read_cached(struct bio *fullbio,
87 	struct bio *bio = NULL;
114 		if (!bio || idx != end_idx) {
115 			struct bio *new = bio_alloc_clone(bdev, fullbio,
118 			if (bio) {
119 				bio_trim(bio, start_idx * PAGE_SECTORS,
121 				bio_chain(bio, new);
122 				submit_bio(bio);
125 			bio = new;
133 	if (bio) {
134 		bio_trim(bio, start_idx * PAGE_SECTORS,
136 		err = submit_bio_wait(bio);
137 		bio_put(bio);
190 			     struct bio **biop, int *block_offset)
202 	struct bio *bio;
204 	bio = bio_kmalloc(page_count, GFP_NOIO);
205 	if (!bio)
207 	bio_init(bio, sb->s_bdev, bio->bi_inline_vecs, page_count, REQ_OP_READ);
208 	bio->bi_iter.bi_sector = block * (msblk->devblksize >> SECTOR_SHIFT);
229 		__bio_add_page(bio, page, len, offset);
235 		error = squashfs_bio_read_cached(bio, cache_mapping, index,
239 		error = submit_bio_wait(bio);
243 	*biop = bio;
248 	bio_free_pages(bio);
249 	bio_uninit(bio);
250 	kfree(bio);
267 	struct bio *bio = NULL;
292 		res = squashfs_bio_read(sb, index, 2, &bio, &offset);
296 		if (WARN_ON_ONCE(!bio_next_segment(bio, &iter_all))) {
306 			if (WARN_ON_ONCE(!bio_next_segment(bio, &iter_all))) {
313 		bio_free_pages(bio);
314 		bio_uninit(bio);
315 		kfree(bio);
333 	res = squashfs_bio_read(sb, index, length, &bio, &offset);
342 		res = msblk->thread_ops->decompress(msblk, bio, offset, length, output);
344 		res = copy_bio_to_actor(bio, output, offset, length);
348 	bio_free_pages(bio);
349 	bio_uninit(bio);
350 	kfree(bio);