diff options
Diffstat (limited to 'fs/btrfs')
-rw-r--r-- | fs/btrfs/backref.c | 1 | ||||
-rw-r--r-- | fs/btrfs/ctree.c | 2 | ||||
-rw-r--r-- | fs/btrfs/discard.c | 1 | ||||
-rw-r--r-- | fs/btrfs/disk-io.c | 6 | ||||
-rw-r--r-- | fs/btrfs/extent_io.c | 43 | ||||
-rw-r--r-- | fs/btrfs/file.c | 1 | ||||
-rw-r--r-- | fs/btrfs/inode.c | 32 | ||||
-rw-r--r-- | fs/btrfs/ref-verify.c | 2 | ||||
-rw-r--r-- | fs/btrfs/space-info.c | 2 | ||||
-rw-r--r-- | fs/btrfs/super.c | 6 | ||||
-rw-r--r-- | fs/btrfs/volumes.c | 8 | ||||
-rw-r--r-- | fs/btrfs/volumes.h | 2 |
12 files changed, 59 insertions, 47 deletions
diff --git a/fs/btrfs/backref.c b/fs/btrfs/backref.c index d888e71e66b6..ea10f7bc99ab 100644 --- a/fs/btrfs/backref.c +++ b/fs/btrfs/backref.c @@ -1461,6 +1461,7 @@ static int btrfs_find_all_roots_safe(struct btrfs_trans_handle *trans, if (ret < 0 && ret != -ENOENT) { ulist_free(tmp); ulist_free(*roots); + *roots = NULL; return ret; } node = ulist_next(tmp, &uiter); diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c index 3a7648bff42c..82ab6e5a386d 100644 --- a/fs/btrfs/ctree.c +++ b/fs/btrfs/ctree.c @@ -1196,7 +1196,7 @@ __tree_mod_log_rewind(struct btrfs_fs_info *fs_info, struct extent_buffer *eb, switch (tm->op) { case MOD_LOG_KEY_REMOVE_WHILE_FREEING: BUG_ON(tm->slot < n); - /* Fallthrough */ + fallthrough; case MOD_LOG_KEY_REMOVE_WHILE_MOVING: case MOD_LOG_KEY_REMOVE: btrfs_set_node_key(eb, &tm->key, tm->slot); diff --git a/fs/btrfs/discard.c b/fs/btrfs/discard.c index 5615320fa659..741c7e19c32f 100644 --- a/fs/btrfs/discard.c +++ b/fs/btrfs/discard.c @@ -619,6 +619,7 @@ void btrfs_discard_punt_unused_bgs_list(struct btrfs_fs_info *fs_info) list_for_each_entry_safe(block_group, next, &fs_info->unused_bgs, bg_list) { list_del_init(&block_group->bg_list); + btrfs_put_block_group(block_group); btrfs_discard_queue_work(&fs_info->discard_ctl, block_group); } spin_unlock(&fs_info->unused_bgs_lock); diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c index 7c6f0bbb54a5..b1a148058773 100644 --- a/fs/btrfs/disk-io.c +++ b/fs/btrfs/disk-io.c @@ -2593,10 +2593,12 @@ static int __cold init_tree_roots(struct btrfs_fs_info *fs_info) !extent_buffer_uptodate(tree_root->node)) { handle_error = true; - if (IS_ERR(tree_root->node)) + if (IS_ERR(tree_root->node)) { ret = PTR_ERR(tree_root->node); - else if (!extent_buffer_uptodate(tree_root->node)) + tree_root->node = NULL; + } else if (!extent_buffer_uptodate(tree_root->node)) { ret = -EUCLEAN; + } btrfs_warn(fs_info, "failed to read tree root"); continue; diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c index 68c96057ad2d..60278e52c37a 100644 --- a/fs/btrfs/extent_io.c +++ b/fs/btrfs/extent_io.c @@ -1999,7 +1999,8 @@ static int __process_pages_contig(struct address_space *mapping, if (!PageDirty(pages[i]) || pages[i]->mapping != mapping) { unlock_page(pages[i]); - put_page(pages[i]); + for (; i < ret; i++) + put_page(pages[i]); err = -EAGAIN; goto out; } @@ -5058,25 +5059,28 @@ struct extent_buffer *alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info, static void check_buffer_tree_ref(struct extent_buffer *eb) { int refs; - /* the ref bit is tricky. We have to make sure it is set - * if we have the buffer dirty. Otherwise the - * code to free a buffer can end up dropping a dirty - * page + /* + * The TREE_REF bit is first set when the extent_buffer is added + * to the radix tree. It is also reset, if unset, when a new reference + * is created by find_extent_buffer. * - * Once the ref bit is set, it won't go away while the - * buffer is dirty or in writeback, and it also won't - * go away while we have the reference count on the - * eb bumped. + * It is only cleared in two cases: freeing the last non-tree + * reference to the extent_buffer when its STALE bit is set or + * calling releasepage when the tree reference is the only reference. * - * We can't just set the ref bit without bumping the - * ref on the eb because free_extent_buffer might - * see the ref bit and try to clear it. If this happens - * free_extent_buffer might end up dropping our original - * ref by mistake and freeing the page before we are able - * to add one more ref. + * In both cases, care is taken to ensure that the extent_buffer's + * pages are not under io. However, releasepage can be concurrently + * called with creating new references, which is prone to race + * conditions between the calls to check_buffer_tree_ref in those + * codepaths and clearing TREE_REF in try_release_extent_buffer. * - * So bump the ref count first, then set the bit. If someone - * beat us to it, drop the ref we added. + * The actual lifetime of the extent_buffer in the radix tree is + * adequately protected by the refcount, but the TREE_REF bit and + * its corresponding reference are not. To protect against this + * class of races, we call check_buffer_tree_ref from the codepaths + * which trigger io after they set eb->io_pages. Note that once io is + * initiated, TREE_REF can no longer be cleared, so that is the + * moment at which any such race is best fixed. */ refs = atomic_read(&eb->refs); if (refs >= 2 && test_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags)) @@ -5527,6 +5531,11 @@ int read_extent_buffer_pages(struct extent_buffer *eb, int wait, int mirror_num) clear_bit(EXTENT_BUFFER_READ_ERR, &eb->bflags); eb->read_mirror = 0; atomic_set(&eb->io_pages, num_reads); + /* + * It is possible for releasepage to clear the TREE_REF bit before we + * set io_pages. See check_buffer_tree_ref for a more detailed comment. + */ + check_buffer_tree_ref(eb); for (i = 0; i < num_pages; i++) { page = eb->pages[i]; diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c index 2520605afc25..b0d2c976587e 100644 --- a/fs/btrfs/file.c +++ b/fs/btrfs/file.c @@ -3509,6 +3509,7 @@ const struct file_operations btrfs_file_operations = { .read_iter = generic_file_read_iter, .splice_read = generic_file_splice_read, .write_iter = btrfs_file_write_iter, + .splice_write = iter_file_splice_write, .mmap = btrfs_file_mmap, .open = btrfs_file_open, .release = btrfs_release_file, diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index 18d384f4af54..6862cd7e21a9 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -1690,12 +1690,8 @@ out_check: ret = fallback_to_cow(inode, locked_page, cow_start, found_key.offset - 1, page_started, nr_written); - if (ret) { - if (nocow) - btrfs_dec_nocow_writers(fs_info, - disk_bytenr); + if (ret) goto error; - } cow_start = (u64)-1; } @@ -1711,9 +1707,6 @@ out_check: ram_bytes, BTRFS_COMPRESS_NONE, BTRFS_ORDERED_PREALLOC); if (IS_ERR(em)) { - if (nocow) - btrfs_dec_nocow_writers(fs_info, - disk_bytenr); ret = PTR_ERR(em); goto error; } @@ -8130,20 +8123,17 @@ again: /* * Qgroup reserved space handler * Page here will be either - * 1) Already written to disk - * In this case, its reserved space is released from data rsv map - * and will be freed by delayed_ref handler finally. - * So even we call qgroup_free_data(), it won't decrease reserved - * space. - * 2) Not written to disk - * This means the reserved space should be freed here. However, - * if a truncate invalidates the page (by clearing PageDirty) - * and the page is accounted for while allocating extent - * in btrfs_check_data_free_space() we let delayed_ref to - * free the entire extent. + * 1) Already written to disk or ordered extent already submitted + * Then its QGROUP_RESERVED bit in io_tree is already cleaned. + * Qgroup will be handled by its qgroup_record then. + * btrfs_qgroup_free_data() call will do nothing here. + * + * 2) Not written to disk yet + * Then btrfs_qgroup_free_data() call will clear the QGROUP_RESERVED + * bit of its io_tree, and free the qgroup reserved data space. + * Since the IO will never happen for this page. */ - if (PageDirty(page)) - btrfs_qgroup_free_data(inode, NULL, page_start, PAGE_SIZE); + btrfs_qgroup_free_data(inode, NULL, page_start, PAGE_SIZE); if (!inode_evicting) { clear_extent_bit(tree, page_start, page_end, EXTENT_LOCKED | EXTENT_DELALLOC | EXTENT_DELALLOC_NEW | diff --git a/fs/btrfs/ref-verify.c b/fs/btrfs/ref-verify.c index 7887317033c9..af92525dbb16 100644 --- a/fs/btrfs/ref-verify.c +++ b/fs/btrfs/ref-verify.c @@ -509,7 +509,7 @@ static int process_leaf(struct btrfs_root *root, switch (key.type) { case BTRFS_EXTENT_ITEM_KEY: *num_bytes = key.offset; - /* fall through */ + fallthrough; case BTRFS_METADATA_ITEM_KEY: *bytenr = key.objectid; ret = process_extent_item(fs_info, path, &key, i, diff --git a/fs/btrfs/space-info.c b/fs/btrfs/space-info.c index 41ee88633769..c7bd3fdd7792 100644 --- a/fs/btrfs/space-info.c +++ b/fs/btrfs/space-info.c @@ -879,8 +879,8 @@ static bool steal_from_global_rsv(struct btrfs_fs_info *fs_info, return false; } global_rsv->reserved -= ticket->bytes; + remove_ticket(space_info, ticket); ticket->bytes = 0; - list_del_init(&ticket->list); wake_up(&ticket->wait); space_info->tickets_id++; if (global_rsv->reserved < global_rsv->size) diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c index bc73fd670702..c3826ae883f0 100644 --- a/fs/btrfs/super.c +++ b/fs/btrfs/super.c @@ -523,7 +523,7 @@ int btrfs_parse_options(struct btrfs_fs_info *info, char *options, case Opt_compress_force: case Opt_compress_force_type: compress_force = true; - /* Fallthrough */ + fallthrough; case Opt_compress: case Opt_compress_type: saved_compress_type = btrfs_test_opt(info, @@ -622,7 +622,7 @@ int btrfs_parse_options(struct btrfs_fs_info *info, char *options, btrfs_set_opt(info->mount_opt, NOSSD); btrfs_clear_and_info(info, SSD, "not using ssd optimizations"); - /* Fallthrough */ + fallthrough; case Opt_nossd_spread: btrfs_clear_and_info(info, SSD_SPREAD, "not using spread ssd allocation scheme"); @@ -793,7 +793,7 @@ int btrfs_parse_options(struct btrfs_fs_info *info, char *options, case Opt_recovery: btrfs_warn(info, "'recovery' is deprecated, use 'usebackuproot' instead"); - /* fall through */ + fallthrough; case Opt_usebackuproot: btrfs_info(info, "trying to use backup root at mount time"); diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c index 0d6e785bcb98..f403fb1e6d37 100644 --- a/fs/btrfs/volumes.c +++ b/fs/btrfs/volumes.c @@ -7052,6 +7052,14 @@ int btrfs_read_chunk_tree(struct btrfs_fs_info *fs_info) mutex_lock(&fs_info->chunk_mutex); /* + * It is possible for mount and umount to race in such a way that + * we execute this code path, but open_fs_devices failed to clear + * total_rw_bytes. We certainly want it cleared before reading the + * device items, so clear it here. + */ + fs_info->fs_devices->total_rw_bytes = 0; + + /* * Read all device items, and then all the chunk items. All * device items are found before any chunk item (their object id * is smaller than the lowest possible object id for a chunk diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h index f067b5934c46..75af2334b2e3 100644 --- a/fs/btrfs/volumes.h +++ b/fs/btrfs/volumes.h @@ -408,7 +408,7 @@ static inline enum btrfs_map_op btrfs_op(struct bio *bio) return BTRFS_MAP_WRITE; default: WARN_ON_ONCE(1); - /* fall through */ + fallthrough; case REQ_OP_READ: return BTRFS_MAP_READ; } |