From: Chris Mason Date: Fri, 23 Jun 2017 16:48:21 +0000 (-0700) Subject: btrfs: fix integer overflow in calc_reclaim_items_nr X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=6374e57ad8091b9c2db2eecc536c7f0166ce099e;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git btrfs: fix integer overflow in calc_reclaim_items_nr Dave Jones hit a WARN_ON(nr < 0) in btrfs_wait_ordered_roots() with v4.12-rc6. This was because commit 70e7af244 made it possible for calc_reclaim_items_nr() to return a negative number. It's not really a bug in that commit, it just didn't go far enough down the stack to find all the possible 64->32 bit overflows. This switches calc_reclaim_items_nr() to return a u64 and changes everyone that uses the results of that math to u64 as well. Reported-by: Dave Jones Fixes: 70e7af2 ("Btrfs: fix delalloc accounting leak caused by u32 overflow") Signed-off-by: Chris Mason Reviewed-by: David Sterba Signed-off-by: David Sterba --- diff --git a/fs/btrfs/dev-replace.c b/fs/btrfs/dev-replace.c index 5fe1ca8abc70..bee3edeea7a3 100644 --- a/fs/btrfs/dev-replace.c +++ b/fs/btrfs/dev-replace.c @@ -388,7 +388,7 @@ int btrfs_dev_replace_start(struct btrfs_fs_info *fs_info, if (ret) btrfs_err(fs_info, "kobj add dev failed %d", ret); - btrfs_wait_ordered_roots(fs_info, -1, 0, (u64)-1); + btrfs_wait_ordered_roots(fs_info, U64_MAX, 0, (u64)-1); /* force writing the updated state information to disk */ trans = btrfs_start_transaction(root, 0); @@ -507,7 +507,7 @@ static int btrfs_dev_replace_finishing(struct btrfs_fs_info *fs_info, mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); return ret; } - btrfs_wait_ordered_roots(fs_info, -1, 0, (u64)-1); + btrfs_wait_ordered_roots(fs_info, U64_MAX, 0, (u64)-1); trans = btrfs_start_transaction(root, 0); if (IS_ERR(trans)) { diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index a3339acec28c..375f8c728d91 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -4288,7 +4288,7 @@ commit_trans: if (need_commit > 0) { btrfs_start_delalloc_roots(fs_info, 0, -1); - btrfs_wait_ordered_roots(fs_info, -1, 0, + btrfs_wait_ordered_roots(fs_info, U64_MAX, 0, (u64)-1); } @@ -4748,14 +4748,14 @@ static void btrfs_writeback_inodes_sb_nr(struct btrfs_fs_info *fs_info, } } -static inline int calc_reclaim_items_nr(struct btrfs_fs_info *fs_info, +static inline u64 calc_reclaim_items_nr(struct btrfs_fs_info *fs_info, u64 to_reclaim) { u64 bytes; - int nr; + u64 nr; bytes = btrfs_calc_trans_metadata_size(fs_info, 1); - nr = (int)div64_u64(to_reclaim, bytes); + nr = div64_u64(to_reclaim, bytes); if (!nr) nr = 1; return nr; @@ -4774,15 +4774,15 @@ static void shrink_delalloc(struct btrfs_fs_info *fs_info, u64 to_reclaim, struct btrfs_trans_handle *trans; u64 delalloc_bytes; u64 max_reclaim; + u64 items; long time_left; unsigned long nr_pages; int loops; - int items; enum btrfs_reserve_flush_enum flush; /* Calc the number of the pages we need flush for space reservation */ items = calc_reclaim_items_nr(fs_info, to_reclaim); - to_reclaim = (u64)items * EXTENT_SIZE_PER_ITEM; + to_reclaim = items * EXTENT_SIZE_PER_ITEM; trans = (struct btrfs_trans_handle *)current->journal_info; block_rsv = &fs_info->delalloc_block_rsv; diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c index b4e9941efb60..fa1b78cf25f6 100644 --- a/fs/btrfs/ioctl.c +++ b/fs/btrfs/ioctl.c @@ -689,7 +689,7 @@ static int create_snapshot(struct btrfs_root *root, struct inode *dir, if (ret) goto dec_and_free; - btrfs_wait_ordered_extents(root, -1, 0, (u64)-1); + btrfs_wait_ordered_extents(root, U64_MAX, 0, (u64)-1); btrfs_init_block_rsv(&pending_snapshot->block_rsv, BTRFS_BLOCK_RSV_TEMP); diff --git a/fs/btrfs/ordered-data.c b/fs/btrfs/ordered-data.c index 7b40e2e7292a..a3aca495e33e 100644 --- a/fs/btrfs/ordered-data.c +++ b/fs/btrfs/ordered-data.c @@ -663,7 +663,7 @@ static void btrfs_run_ordered_extent_work(struct btrfs_work *work) * wait for all the ordered extents in a root. This is done when balancing * space between drives. */ -int btrfs_wait_ordered_extents(struct btrfs_root *root, int nr, +u64 btrfs_wait_ordered_extents(struct btrfs_root *root, u64 nr, const u64 range_start, const u64 range_len) { struct btrfs_fs_info *fs_info = root->fs_info; @@ -671,7 +671,7 @@ int btrfs_wait_ordered_extents(struct btrfs_root *root, int nr, LIST_HEAD(skipped); LIST_HEAD(works); struct btrfs_ordered_extent *ordered, *next; - int count = 0; + u64 count = 0; const u64 range_end = range_start + range_len; mutex_lock(&root->ordered_extent_mutex); @@ -701,7 +701,7 @@ int btrfs_wait_ordered_extents(struct btrfs_root *root, int nr, cond_resched(); spin_lock(&root->ordered_extent_lock); - if (nr != -1) + if (nr != U64_MAX) nr--; count++; } @@ -720,13 +720,13 @@ int btrfs_wait_ordered_extents(struct btrfs_root *root, int nr, return count; } -int btrfs_wait_ordered_roots(struct btrfs_fs_info *fs_info, int nr, - const u64 range_start, const u64 range_len) +u64 btrfs_wait_ordered_roots(struct btrfs_fs_info *fs_info, u64 nr, + const u64 range_start, const u64 range_len) { struct btrfs_root *root; struct list_head splice; - int done; - int total_done = 0; + u64 total_done = 0; + u64 done; INIT_LIST_HEAD(&splice); @@ -748,9 +748,8 @@ int btrfs_wait_ordered_roots(struct btrfs_fs_info *fs_info, int nr, total_done += done; spin_lock(&fs_info->ordered_root_lock); - if (nr != -1) { + if (nr != U64_MAX) { nr -= done; - WARN_ON(nr < 0); } } list_splice_tail(&splice, &fs_info->ordered_roots); diff --git a/fs/btrfs/ordered-data.h b/fs/btrfs/ordered-data.h index e0c1d5b8d859..56c4c0ee6381 100644 --- a/fs/btrfs/ordered-data.h +++ b/fs/btrfs/ordered-data.h @@ -200,9 +200,9 @@ int btrfs_ordered_update_i_size(struct inode *inode, u64 offset, struct btrfs_ordered_extent *ordered); int btrfs_find_ordered_sum(struct inode *inode, u64 offset, u64 disk_bytenr, u32 *sum, int len); -int btrfs_wait_ordered_extents(struct btrfs_root *root, int nr, +u64 btrfs_wait_ordered_extents(struct btrfs_root *root, u64 nr, const u64 range_start, const u64 range_len); -int btrfs_wait_ordered_roots(struct btrfs_fs_info *fs_info, int nr, +u64 btrfs_wait_ordered_roots(struct btrfs_fs_info *fs_info, u64 nr, const u64 range_start, const u64 range_len); void btrfs_get_logged_extents(struct btrfs_inode *inode, struct list_head *logged_list, diff --git a/fs/btrfs/qgroup.c b/fs/btrfs/qgroup.c index fc9dffaa9524..4ce351efe281 100644 --- a/fs/btrfs/qgroup.c +++ b/fs/btrfs/qgroup.c @@ -2405,7 +2405,7 @@ retry: ret = btrfs_start_delalloc_inodes(root, 0); if (ret) return ret; - btrfs_wait_ordered_extents(root, -1, 0, (u64)-1); + btrfs_wait_ordered_extents(root, U64_MAX, 0, (u64)-1); trans = btrfs_join_transaction(root); if (IS_ERR(trans)) return PTR_ERR(trans); diff --git a/fs/btrfs/relocation.c b/fs/btrfs/relocation.c index dc69b6ba29af..65661d1aae4e 100644 --- a/fs/btrfs/relocation.c +++ b/fs/btrfs/relocation.c @@ -4373,7 +4373,7 @@ int btrfs_relocate_block_group(struct btrfs_fs_info *fs_info, u64 group_start) btrfs_wait_block_group_reservations(rc->block_group); btrfs_wait_nocow_writers(rc->block_group); - btrfs_wait_ordered_roots(fs_info, -1, + btrfs_wait_ordered_roots(fs_info, U64_MAX, rc->block_group->key.objectid, rc->block_group->key.offset); diff --git a/fs/btrfs/scrub.c b/fs/btrfs/scrub.c index 738e784ba20d..0cebeb5eb5d0 100644 --- a/fs/btrfs/scrub.c +++ b/fs/btrfs/scrub.c @@ -3836,7 +3836,7 @@ int scrub_enumerate_chunks(struct scrub_ctx *sctx, */ btrfs_wait_block_group_reservations(cache); btrfs_wait_nocow_writers(cache); - ret = btrfs_wait_ordered_roots(fs_info, -1, + ret = btrfs_wait_ordered_roots(fs_info, U64_MAX, cache->key.objectid, cache->key.offset); if (ret > 0) { diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c index ba2cb7f96986..74e47794e63f 100644 --- a/fs/btrfs/super.c +++ b/fs/btrfs/super.c @@ -1177,7 +1177,7 @@ int btrfs_sync_fs(struct super_block *sb, int wait) return 0; } - btrfs_wait_ordered_roots(fs_info, -1, 0, (u64)-1); + btrfs_wait_ordered_roots(fs_info, U64_MAX, 0, (u64)-1); trans = btrfs_attach_transaction_barrier(root); if (IS_ERR(trans)) { diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c index 309b73da756b..f615d59b0489 100644 --- a/fs/btrfs/transaction.c +++ b/fs/btrfs/transaction.c @@ -1923,7 +1923,7 @@ static inline int btrfs_start_delalloc_flush(struct btrfs_fs_info *fs_info) static inline void btrfs_wait_delalloc_flush(struct btrfs_fs_info *fs_info) { if (btrfs_test_opt(fs_info, FLUSHONCOMMIT)) - btrfs_wait_ordered_roots(fs_info, -1, 0, (u64)-1); + btrfs_wait_ordered_roots(fs_info, U64_MAX, 0, (u64)-1); } static inline void