diff options
Diffstat (limited to 'fs/btrfs/compression.c')
-rw-r--r-- | fs/btrfs/compression.c | 365 |
1 files changed, 105 insertions, 260 deletions
diff --git a/fs/btrfs/compression.c b/fs/btrfs/compression.c index f4564f32f6d9..e84d22c5c6a8 100644 --- a/fs/btrfs/compression.c +++ b/fs/btrfs/compression.c @@ -136,109 +136,14 @@ static int compression_decompress(int type, struct list_head *ws, static int btrfs_decompress_bio(struct compressed_bio *cb); -static inline int compressed_bio_size(struct btrfs_fs_info *fs_info, - unsigned long disk_size) -{ - return sizeof(struct compressed_bio) + - (DIV_ROUND_UP(disk_size, fs_info->sectorsize)) * fs_info->csum_size; -} - -static int check_compressed_csum(struct btrfs_inode *inode, struct bio *bio, - u64 disk_start) -{ - 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 int i; - char *kaddr; - u8 csum[BTRFS_CSUM_SIZE]; - struct compressed_bio *cb = bio->bi_private; - u8 *cb_sum = cb->sums; - - if ((inode->flags & BTRFS_INODE_NODATASUM) || - test_bit(BTRFS_FS_STATE_NO_CSUMS, &fs_info->fs_state)) - return 0; - - 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]; - - /* 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_bio(bio)->device) - btrfs_dev_stat_inc_and_print( - btrfs_bio(bio)->device, - BTRFS_DEV_STAT_CORRUPTION_ERRS); - return -EIO; - } - cb_sum += csum_size; - disk_start += sectorsize; - } - } - return 0; -} - -/* - * Reduce bio and io accounting for a compressed_bio with its corresponding bio. - * - * Return true if there is no pending bio nor io. - * Return false otherwise. - */ -static bool dec_and_test_compressed_bio(struct compressed_bio *cb, struct bio *bio) -{ - struct btrfs_fs_info *fs_info = btrfs_sb(cb->inode->i_sb); - unsigned int bi_size = 0; - bool last_io = false; - struct bio_vec *bvec; - struct bvec_iter_all iter_all; - - /* - * At endio time, bi_iter.bi_size doesn't represent the real bio size. - * Thus here we have to iterate through all segments to grab correct - * bio size. - */ - bio_for_each_segment_all(bvec, bio, iter_all) - bi_size += bvec->bv_len; - - if (bio->bi_status) - cb->status = bio->bi_status; - - ASSERT(bi_size && bi_size <= cb->compressed_len); - last_io = refcount_sub_and_test(bi_size >> fs_info->sectorsize_bits, - &cb->pending_sectors); - /* - * Here we must wake up the possible error handler after all other - * operations on @cb finished, or we can race with - * finish_compressed_bio_*() which may free @cb. - */ - wake_up_var(cb); - - return last_io; -} - static void finish_compressed_bio_read(struct compressed_bio *cb) { unsigned int index; struct page *page; + if (cb->status == BLK_STS_OK) + cb->status = errno_to_blk_status(btrfs_decompress_bio(cb)); + /* Release the compressed pages */ for (index = 0; index < cb->nr_pages; index++) { page = cb->compressed_pages[index]; @@ -247,85 +152,63 @@ static void finish_compressed_bio_read(struct compressed_bio *cb) } /* Do io completion on the original bio */ - if (cb->status != BLK_STS_OK) { + if (cb->status != BLK_STS_OK) cb->orig_bio->bi_status = cb->status; - bio_endio(cb->orig_bio); - } else { - struct bio_vec *bvec; - struct bvec_iter_all iter_all; - - /* - * We have verified the checksum already, set page checked so - * the end_io handlers know about it - */ - ASSERT(!bio_flagged(cb->orig_bio, BIO_CLONED)); - bio_for_each_segment_all(bvec, cb->orig_bio, iter_all) { - u64 bvec_start = page_offset(bvec->bv_page) + - bvec->bv_offset; - - btrfs_page_set_checked(btrfs_sb(cb->inode->i_sb), - bvec->bv_page, bvec_start, - bvec->bv_len); - } - - bio_endio(cb->orig_bio); - } + bio_endio(cb->orig_bio); /* Finally free the cb struct */ kfree(cb->compressed_pages); kfree(cb); } -/* when we finish reading compressed pages from the disk, we - * decompress them and then run the bio end_io routines on the - * decompressed pages (in the inode address space). - * - * This allows the checksumming and other IO error handling routines - * to work normally - * - * The compressed pages are freed here, and it must be run - * in process context +/* + * Verify the checksums and kick off repair if needed on the uncompressed data + * before decompressing it into the original bio and freeing the uncompressed + * pages. */ static void end_compressed_bio_read(struct bio *bio) { struct compressed_bio *cb = bio->bi_private; - struct inode *inode; - unsigned int mirror = btrfs_bio(bio)->mirror_num; - int ret = 0; - - if (!dec_and_test_compressed_bio(cb, bio)) - goto out; - - /* - * Record the correct mirror_num in cb->orig_bio so that - * read-repair can work properly. - */ - btrfs_bio(cb->orig_bio)->mirror_num = mirror; - cb->mirror_num = mirror; - - /* - * Some IO in this cb have failed, just skip checksum as there - * is no way it could be correct. - */ - if (cb->status != BLK_STS_OK) - goto csum_failed; - - inode = cb->inode; - ret = check_compressed_csum(BTRFS_I(inode), bio, - bio->bi_iter.bi_sector << 9); - if (ret) - goto csum_failed; + struct inode *inode = cb->inode; + struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); + struct btrfs_inode *bi = BTRFS_I(inode); + bool csum = !(bi->flags & BTRFS_INODE_NODATASUM) && + !test_bit(BTRFS_FS_STATE_NO_CSUMS, &fs_info->fs_state); + blk_status_t status = bio->bi_status; + struct btrfs_bio *bbio = btrfs_bio(bio); + struct bvec_iter iter; + struct bio_vec bv; + u32 offset; + + btrfs_bio_for_each_sector(fs_info, bv, bbio, iter, offset) { + u64 start = bbio->file_offset + offset; + + if (!status && + (!csum || !btrfs_check_data_csum(inode, bbio, offset, + bv.bv_page, bv.bv_offset))) { + clean_io_failure(fs_info, &bi->io_failure_tree, + &bi->io_tree, start, bv.bv_page, + btrfs_ino(bi), bv.bv_offset); + } else { + int ret; + + refcount_inc(&cb->pending_ios); + ret = btrfs_repair_one_sector(inode, bbio, offset, + bv.bv_page, bv.bv_offset, + btrfs_submit_data_read_bio); + if (ret) { + refcount_dec(&cb->pending_ios); + status = errno_to_blk_status(ret); + } + } + } - /* ok, we're the last bio for this extent, lets start - * the decompression. - */ - ret = btrfs_decompress_bio(cb); + if (status) + cb->status = status; -csum_failed: - if (ret) - cb->status = errno_to_blk_status(ret); - finish_compressed_bio_read(cb); -out: + if (refcount_dec_and_test(&cb->pending_ios)) + finish_compressed_bio_read(cb); + btrfs_bio_free_csum(bbio); bio_put(bio); } @@ -403,6 +286,14 @@ static void finish_compressed_bio_write(struct compressed_bio *cb) kfree(cb); } +static void btrfs_finish_compressed_write_work(struct work_struct *work) +{ + struct compressed_bio *cb = + container_of(work, struct compressed_bio, write_end_work); + + finish_compressed_bio_write(cb); +} + /* * Do the cleanup once all the compressed pages hit the disk. This will clear * writeback on the file pages and free the compressed pages. @@ -414,29 +305,18 @@ static void end_compressed_bio_write(struct bio *bio) { struct compressed_bio *cb = bio->bi_private; - if (!dec_and_test_compressed_bio(cb, bio)) - goto out; + if (bio->bi_status) + cb->status = bio->bi_status; - btrfs_record_physical_zoned(cb->inode, cb->start, bio); + if (refcount_dec_and_test(&cb->pending_ios)) { + struct btrfs_fs_info *fs_info = btrfs_sb(cb->inode->i_sb); - finish_compressed_bio_write(cb); -out: + btrfs_record_physical_zoned(cb->inode, cb->start, bio); + queue_work(fs_info->compressed_write_workers, &cb->write_end_work); + } bio_put(bio); } -static blk_status_t submit_compressed_bio(struct btrfs_fs_info *fs_info, - struct bio *bio, int mirror_num) -{ - blk_status_t ret; - - ASSERT(bio->bi_iter.bi_size); - ret = btrfs_bio_wq_end_io(fs_info, bio, BTRFS_WQ_ENDIO_DATA); - if (ret) - return ret; - ret = btrfs_map_bio(fs_info, bio, mirror_num); - return ret; -} - /* * Allocate a compressed_bio, which will be used to read/write on-disk * (aka, compressed) * data. @@ -455,7 +335,7 @@ static blk_status_t submit_compressed_bio(struct btrfs_fs_info *fs_info, static struct bio *alloc_compressed_bio(struct compressed_bio *cb, u64 disk_bytenr, - unsigned int opf, bio_end_io_t endio_func, + blk_opf_t opf, bio_end_io_t endio_func, u64 *next_stripe_start) { struct btrfs_fs_info *fs_info = btrfs_sb(cb->inode->i_sb); @@ -487,7 +367,7 @@ static struct bio *alloc_compressed_bio(struct compressed_bio *cb, u64 disk_byte return ERR_PTR(ret); } *next_stripe_start = disk_bytenr + geom.len; - + refcount_inc(&cb->pending_ios); return bio; } @@ -505,7 +385,7 @@ blk_status_t btrfs_submit_compressed_write(struct btrfs_inode *inode, u64 start, unsigned int compressed_len, struct page **compressed_pages, unsigned int nr_pages, - unsigned int write_flags, + blk_opf_t write_flags, struct cgroup_subsys_state *blkcg_css, bool writeback) { @@ -514,26 +394,25 @@ blk_status_t btrfs_submit_compressed_write(struct btrfs_inode *inode, u64 start, struct compressed_bio *cb; u64 cur_disk_bytenr = disk_start; u64 next_stripe_start; - blk_status_t ret; + blk_status_t ret = BLK_STS_OK; int skip_sum = inode->flags & BTRFS_INODE_NODATASUM; const bool use_append = btrfs_use_zone_append(inode, disk_start); - const unsigned int bio_op = use_append ? REQ_OP_ZONE_APPEND : REQ_OP_WRITE; + const enum req_op bio_op = use_append ? REQ_OP_ZONE_APPEND : REQ_OP_WRITE; ASSERT(IS_ALIGNED(start, fs_info->sectorsize) && IS_ALIGNED(len, fs_info->sectorsize)); - cb = kmalloc(compressed_bio_size(fs_info, compressed_len), GFP_NOFS); + cb = kmalloc(sizeof(struct compressed_bio), GFP_NOFS); if (!cb) return BLK_STS_RESOURCE; - refcount_set(&cb->pending_sectors, compressed_len >> fs_info->sectorsize_bits); + refcount_set(&cb->pending_ios, 1); cb->status = BLK_STS_OK; cb->inode = &inode->vfs_inode; cb->start = start; cb->len = len; - cb->mirror_num = 0; cb->compressed_pages = compressed_pages; cb->compressed_len = compressed_len; cb->writeback = writeback; - cb->orig_bio = NULL; + INIT_WORK(&cb->write_end_work, btrfs_finish_compressed_write_work); cb->nr_pages = nr_pages; if (blkcg_css) @@ -554,8 +433,7 @@ blk_status_t btrfs_submit_compressed_write(struct btrfs_inode *inode, u64 start, &next_stripe_start); if (IS_ERR(bio)) { ret = errno_to_blk_status(PTR_ERR(bio)); - bio = NULL; - goto finish_cb; + break; } if (blkcg_css) bio->bi_opf |= REQ_CGROUP_PUNT; @@ -599,44 +477,25 @@ blk_status_t btrfs_submit_compressed_write(struct btrfs_inode *inode, u64 start, if (submit) { if (!skip_sum) { ret = btrfs_csum_one_bio(inode, bio, start, true); - if (ret) - goto finish_cb; + if (ret) { + bio->bi_status = ret; + bio_endio(bio); + break; + } } - ret = submit_compressed_bio(fs_info, bio, 0); - if (ret) - goto finish_cb; + ASSERT(bio->bi_iter.bi_size); + btrfs_submit_bio(fs_info, bio, 0); bio = NULL; } cond_resched(); } - if (blkcg_css) - kthread_associate_blkcg(NULL); - - return 0; -finish_cb: if (blkcg_css) kthread_associate_blkcg(NULL); - if (bio) { - bio->bi_status = ret; - bio_endio(bio); - } - /* Last byte of @cb is submitted, endio will free @cb */ - if (cur_disk_bytenr == disk_start + compressed_len) - return ret; - - wait_var_event(cb, refcount_read(&cb->pending_sectors) == - (disk_start + compressed_len - cur_disk_bytenr) >> - fs_info->sectorsize_bits); - /* - * Even with previous bio ended, we should still have io not yet - * submitted, thus need to finish manually. - */ - ASSERT(refcount_read(&cb->pending_sectors)); - /* Now we are the only one referring @cb, can finish it safely. */ - finish_compressed_bio_write(cb); + if (refcount_dec_and_test(&cb->pending_ios)) + finish_compressed_bio_write(cb); return ret; } @@ -765,7 +624,6 @@ static noinline int add_ra_bio_pages(struct inode *inode, int zeros; zeros = PAGE_SIZE - zero_offset; memzero_page(page, zero_offset, zeros); - flush_dcache_page(page); } } @@ -819,7 +677,6 @@ void btrfs_submit_compressed_read(struct inode *inode, struct bio *bio, blk_status_t ret; int ret2; int i; - u8 *sums; em_tree = &BTRFS_I(inode)->extent_tree; @@ -837,17 +694,15 @@ void btrfs_submit_compressed_read(struct inode *inode, struct bio *bio, ASSERT(em->compress_type != BTRFS_COMPRESS_NONE); compressed_len = em->block_len; - cb = kmalloc(compressed_bio_size(fs_info, compressed_len), GFP_NOFS); + cb = kmalloc(sizeof(struct compressed_bio), GFP_NOFS); if (!cb) { ret = BLK_STS_RESOURCE; goto out; } - refcount_set(&cb->pending_sectors, compressed_len >> fs_info->sectorsize_bits); + refcount_set(&cb->pending_ios, 1); cb->status = BLK_STS_OK; cb->inode = inode; - cb->mirror_num = mirror_num; - sums = cb->sums; cb->start = em->orig_start; em_len = em->len; @@ -893,9 +748,8 @@ void btrfs_submit_compressed_read(struct inode *inode, struct bio *bio, REQ_OP_READ, end_compressed_bio_read, &next_stripe_start); if (IS_ERR(comp_bio)) { - ret = errno_to_blk_status(PTR_ERR(comp_bio)); - comp_bio = NULL; - goto finish_cb; + cb->status = errno_to_blk_status(PTR_ERR(comp_bio)); + break; } } /* @@ -931,22 +785,33 @@ void btrfs_submit_compressed_read(struct inode *inode, struct bio *bio, submit = true; if (submit) { - unsigned int nr_sectors; + /* Save the original iter for read repair */ + if (bio_op(comp_bio) == REQ_OP_READ) + btrfs_bio(comp_bio)->iter = comp_bio->bi_iter; - ret = btrfs_lookup_bio_sums(inode, comp_bio, sums); - if (ret) - goto finish_cb; + /* + * Save the initial offset of this chunk, as there + * is no direct correlation between compressed pages and + * the original file offset. The field is only used for + * priting error messages. + */ + btrfs_bio(comp_bio)->file_offset = file_offset; - nr_sectors = DIV_ROUND_UP(comp_bio->bi_iter.bi_size, - fs_info->sectorsize); - sums += fs_info->csum_size * nr_sectors; + ret = btrfs_lookup_bio_sums(inode, comp_bio, NULL); + if (ret) { + comp_bio->bi_status = ret; + bio_endio(comp_bio); + break; + } - ret = submit_compressed_bio(fs_info, comp_bio, mirror_num); - if (ret) - goto finish_cb; + ASSERT(comp_bio->bi_iter.bi_size); + btrfs_submit_bio(fs_info, comp_bio, mirror_num); comp_bio = NULL; } } + + if (refcount_dec_and_test(&cb->pending_ios)) + finish_compressed_bio_read(cb); return; fail: @@ -964,25 +829,6 @@ out: bio->bi_status = ret; bio_endio(bio); return; -finish_cb: - if (comp_bio) { - comp_bio->bi_status = ret; - bio_endio(comp_bio); - } - /* All bytes of @cb is submitted, endio will free @cb */ - if (cur_disk_byte == disk_bytenr + compressed_len) - return; - - wait_var_event(cb, refcount_read(&cb->pending_sectors) == - (disk_bytenr + compressed_len - cur_disk_byte) >> - fs_info->sectorsize_bits); - /* - * Even with previous bio ended, we should still have io not yet - * submitted, thus need to finish @cb manually. - */ - ASSERT(refcount_read(&cb->pending_sectors)); - /* Now we are the only one referring @cb, can finish it safely. */ - finish_compressed_bio_read(cb); } /* @@ -1481,7 +1327,6 @@ int btrfs_decompress_buf2page(const char *buf, u32 buf_len, ASSERT(copy_start - decompressed < buf_len); memcpy_to_page(bvec.bv_page, bvec.bv_offset, buf + copy_start - decompressed, copy_len); - flush_dcache_page(bvec.bv_page); cur_offset += copy_len; bio_advance(orig_bio, copy_len); |