diff options
Diffstat (limited to 'fs/btrfs/disk-io.c')
-rw-r--r-- | fs/btrfs/disk-io.c | 116 |
1 files changed, 86 insertions, 30 deletions
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c index 6297a030ac50..16a0cada26c2 100644 --- a/fs/btrfs/disk-io.c +++ b/fs/btrfs/disk-io.c @@ -98,6 +98,7 @@ struct async_submit_bio { */ u64 bio_offset; struct btrfs_work work; + int error; }; /* @@ -405,7 +406,7 @@ static int csum_dirty_buffer(struct btrfs_root *root, struct page *page) u64 found_start; unsigned long len; struct extent_buffer *eb; - int ret; + int ret = -EIO; tree = &BTRFS_I(page->mapping->host)->io_tree; @@ -423,13 +424,20 @@ static int csum_dirty_buffer(struct btrfs_root *root, struct page *page) eb = alloc_extent_buffer(tree, start, len, page); if (eb == NULL) { WARN_ON(1); + ret = -ENOMEM; goto out; } ret = btree_read_extent_buffer_pages(root, eb, start + PAGE_CACHE_SIZE, btrfs_header_generation(eb)); - BUG_ON(ret); + if (ret) { + btrfs_printk(root->fs_info, KERN_WARNING + "Failed to checksum dirty buffer @ %llu[%lu]\n", + start, len); + goto err; + } WARN_ON(!btrfs_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN)); + ret = -EIO; found_start = btrfs_header_bytenr(eb); if (found_start != start) { WARN_ON(1); @@ -444,10 +452,11 @@ static int csum_dirty_buffer(struct btrfs_root *root, struct page *page) goto err; } csum_tree_block(root, eb, 0); + ret = 0; err: free_extent_buffer(eb); out: - return 0; + return ret; } static int check_tree_block_fsid(struct btrfs_root *root, @@ -718,11 +727,14 @@ unsigned long btrfs_async_submit_limit(struct btrfs_fs_info *info) static void run_one_async_start(struct btrfs_work *work) { struct async_submit_bio *async; + int ret; async = container_of(work, struct async_submit_bio, work); - async->submit_bio_start(async->inode, async->rw, async->bio, - async->mirror_num, async->bio_flags, - async->bio_offset); + ret = async->submit_bio_start(async->inode, async->rw, async->bio, + async->mirror_num, async->bio_flags, + async->bio_offset); + if (ret) + async->error = ret; } static void run_one_async_done(struct btrfs_work *work) @@ -743,6 +755,12 @@ static void run_one_async_done(struct btrfs_work *work) waitqueue_active(&fs_info->async_submit_wait)) wake_up(&fs_info->async_submit_wait); + /* If an error occured we just want to clean up the bio and move on */ + if (async->error) { + bio_endio(async->bio, async->error); + return; + } + async->submit_bio_done(async->inode, async->rw, async->bio, async->mirror_num, async->bio_flags, async->bio_offset); @@ -784,6 +802,8 @@ int btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct inode *inode, async->bio_flags = bio_flags; async->bio_offset = bio_offset; + async->error = 0; + atomic_inc(&fs_info->nr_async_submits); if (rw & REQ_SYNC) @@ -805,15 +825,18 @@ static int btree_csum_one_bio(struct bio *bio) struct bio_vec *bvec = bio->bi_io_vec; int bio_index = 0; struct btrfs_root *root; + int ret = 0; WARN_ON(bio->bi_vcnt <= 0); while (bio_index < bio->bi_vcnt) { root = BTRFS_I(bvec->bv_page->mapping->host)->root; - csum_dirty_buffer(root, bvec->bv_page); + ret = csum_dirty_buffer(root, bvec->bv_page); + if (ret) + break; bio_index++; bvec++; } - return 0; + return ret; } static int __btree_submit_bio_start(struct inode *inode, int rw, @@ -825,8 +848,7 @@ static int __btree_submit_bio_start(struct inode *inode, int rw, * when we're called for a write, we're already in the async * submission context. Just jump into btrfs_map_bio */ - btree_csum_one_bio(bio); - return 0; + return btree_csum_one_bio(bio); } static int __btree_submit_bio_done(struct inode *inode, int rw, struct bio *bio, @@ -1381,7 +1403,7 @@ struct btrfs_root *btrfs_read_fs_root_no_radix(struct btrfs_root *tree_root, root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item), blocksize, generation); root->commit_root = btrfs_root_node(root); - BUG_ON(!root->node); + BUG_ON(!root->node); /* -ENOMEM */ out: if (location->objectid != BTRFS_TREE_LOG_OBJECTID) { root->ref_cows = 1; @@ -1618,7 +1640,6 @@ static int transaction_kthread(void *arg) u64 transid; unsigned long now; unsigned long delay; - int ret; do { delay = HZ * 30; @@ -1642,11 +1663,12 @@ static int transaction_kthread(void *arg) transid = cur->transid; spin_unlock(&root->fs_info->trans_lock); + /* If the file system is aborted, this will always fail. */ trans = btrfs_join_transaction(root); - BUG_ON(IS_ERR(trans)); + if (IS_ERR(trans)) + goto sleep; if (transid == trans->transid) { - ret = btrfs_commit_transaction(trans, root); - BUG_ON(ret); + btrfs_commit_transaction(trans, root); } else { btrfs_end_transaction(trans, root); } @@ -2289,7 +2311,7 @@ int open_ctree(struct super_block *sb, chunk_root->node = read_tree_block(chunk_root, btrfs_super_chunk_root(disk_super), blocksize, generation); - BUG_ON(!chunk_root->node); + BUG_ON(!chunk_root->node); /* -ENOMEM */ if (!test_bit(EXTENT_BUFFER_UPTODATE, &chunk_root->node->bflags)) { printk(KERN_WARNING "btrfs: failed to read chunk root on %s\n", sb->s_id); @@ -2429,21 +2451,31 @@ retry_root_backup: log_tree_root->node = read_tree_block(tree_root, bytenr, blocksize, generation + 1); + /* returns with log_tree_root freed on success */ ret = btrfs_recover_log_trees(log_tree_root); - BUG_ON(ret); + if (ret) { + btrfs_error(tree_root->fs_info, ret, + "Failed to recover log tree"); + free_extent_buffer(log_tree_root->node); + kfree(log_tree_root); + goto fail_trans_kthread; + } if (sb->s_flags & MS_RDONLY) { - ret = btrfs_commit_super(tree_root); - BUG_ON(ret); + ret = btrfs_commit_super(tree_root); + if (ret) + goto fail_trans_kthread; } } ret = btrfs_find_orphan_roots(tree_root); - BUG_ON(ret); + if (ret) + goto fail_trans_kthread; if (!(sb->s_flags & MS_RDONLY)) { ret = btrfs_cleanup_fs_roots(fs_info); - BUG_ON(ret); + if (ret) { + } ret = btrfs_recover_relocation(tree_root); if (ret < 0) { @@ -2863,6 +2895,8 @@ int write_all_supers(struct btrfs_root *root, int max_mirrors) if (total_errors > max_errors) { printk(KERN_ERR "btrfs: %d errors while writing supers\n", total_errors); + + /* This shouldn't happen. FUA is masked off if unsupported */ BUG(); } @@ -2879,9 +2913,9 @@ int write_all_supers(struct btrfs_root *root, int max_mirrors) } mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); if (total_errors > max_errors) { - printk(KERN_ERR "btrfs: %d errors while writing supers\n", - total_errors); - BUG(); + btrfs_error(root->fs_info, -EIO, + "%d errors while writing supers", total_errors); + return -EIO; } return 0; } @@ -3014,14 +3048,21 @@ int btrfs_commit_super(struct btrfs_root *root) if (IS_ERR(trans)) return PTR_ERR(trans); ret = btrfs_commit_transaction(trans, root); - BUG_ON(ret); + if (ret) + return ret; /* run commit again to drop the original snapshot */ trans = btrfs_join_transaction(root); if (IS_ERR(trans)) return PTR_ERR(trans); - btrfs_commit_transaction(trans, root); + ret = btrfs_commit_transaction(trans, root); + if (ret) + return ret; ret = btrfs_write_and_wait_transaction(NULL, root); - BUG_ON(ret); + if (ret) { + btrfs_error(root->fs_info, ret, + "Failed to sync btree inode to disk."); + return ret; + } ret = write_ctree_super(NULL, root, 0); return ret; @@ -3366,8 +3407,8 @@ static void btrfs_destroy_ordered_extents(struct btrfs_root *root) spin_unlock(&root->fs_info->ordered_extent_lock); } -static int btrfs_destroy_delayed_refs(struct btrfs_transaction *trans, - struct btrfs_root *root) +int btrfs_destroy_delayed_refs(struct btrfs_transaction *trans, + struct btrfs_root *root) { struct rb_node *node; struct btrfs_delayed_ref_root *delayed_refs; @@ -3376,6 +3417,7 @@ static int btrfs_destroy_delayed_refs(struct btrfs_transaction *trans, delayed_refs = &trans->delayed_refs; +again: spin_lock(&delayed_refs->lock); if (delayed_refs->num_entries == 0) { spin_unlock(&delayed_refs->lock); @@ -3397,6 +3439,7 @@ static int btrfs_destroy_delayed_refs(struct btrfs_transaction *trans, struct btrfs_delayed_ref_head *head; head = btrfs_delayed_node_to_head(ref); + spin_unlock(&delayed_refs->lock); mutex_lock(&head->mutex); kfree(head->extent_op); delayed_refs->num_heads--; @@ -3404,8 +3447,9 @@ static int btrfs_destroy_delayed_refs(struct btrfs_transaction *trans, delayed_refs->num_heads_ready--; list_del_init(&head->cluster); mutex_unlock(&head->mutex); + btrfs_put_delayed_ref(ref); + goto again; } - spin_unlock(&delayed_refs->lock); btrfs_put_delayed_ref(ref); @@ -3649,6 +3693,17 @@ int btrfs_cleanup_transaction(struct btrfs_root *root) return 0; } +static int btree_writepage_io_failed_hook(struct bio *bio, struct page *page, + u64 start, u64 end, + struct extent_state *state) +{ + struct super_block *sb = page->mapping->host->i_sb; + struct btrfs_fs_info *fs_info = btrfs_sb(sb); + btrfs_error(fs_info, -EIO, + "Error occured while writing out btree at %llu", start); + return -EIO; +} + static struct extent_io_ops btree_extent_io_ops = { .write_cache_pages_lock_hook = btree_lock_page_hook, .readpage_end_io_hook = btree_readpage_end_io_hook, @@ -3656,4 +3711,5 @@ static struct extent_io_ops btree_extent_io_ops = { .submit_bio_hook = btree_submit_bio_hook, /* note we're sharing with inode.c for the merge bio hook */ .merge_bio_hook = btrfs_merge_bio_hook, + .writepage_io_failed_hook = btree_writepage_io_failed_hook, }; |