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| author | Filipe Manana <fdmanana@suse.com> | 2023-06-30 18:03:44 +0300 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2023-07-24 19:06:05 +0300 |
| commit | d8ccbd21918fd7fa6ce3226cffc22c444228e8ad (patch) | |
| tree | 912e5f1e52345667e1e8ab43bc31c73f9e191235 /fs/btrfs/free-space-tree.c | |
| parent | 8dbfc14fc736eb701089aff09645c3d4ad3decb1 (diff) | |
| download | linux-d8ccbd21918fd7fa6ce3226cffc22c444228e8ad.tar.xz | |
btrfs: remove BUG_ON()'s in add_new_free_space()
At add_new_free_space() we have these BUG_ON()'s that are there to deal
with any failure to add free space to the in memory free space cache.
Such failures are mostly -ENOMEM that should be very rare. However there's
no need to have these BUG_ON()'s, we can just return any error to the
caller and all callers and their upper call chain are already dealing with
errors.
So just make add_new_free_space() return any errors, while removing the
BUG_ON()'s, and returning the total amount of added free space to an
optional u64 pointer argument.
Reported-by: syzbot+3ba856e07b7127889d8c@syzkaller.appspotmail.com
Link: https://lore.kernel.org/linux-btrfs/000000000000e9cb8305ff4e8327@google.com/
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs/free-space-tree.c')
| -rw-r--r-- | fs/btrfs/free-space-tree.c | 24 |
1 files changed, 17 insertions, 7 deletions
diff --git a/fs/btrfs/free-space-tree.c b/fs/btrfs/free-space-tree.c index 045ddce32eca..f169378e2ca6 100644 --- a/fs/btrfs/free-space-tree.c +++ b/fs/btrfs/free-space-tree.c @@ -1515,9 +1515,13 @@ static int load_free_space_bitmaps(struct btrfs_caching_control *caching_ctl, if (prev_bit == 0 && bit == 1) { extent_start = offset; } else if (prev_bit == 1 && bit == 0) { - total_found += add_new_free_space(block_group, - extent_start, - offset); + u64 space_added; + + ret = add_new_free_space(block_group, extent_start, + offset, &space_added); + if (ret) + goto out; + total_found += space_added; if (total_found > CACHING_CTL_WAKE_UP) { total_found = 0; wake_up(&caching_ctl->wait); @@ -1529,8 +1533,9 @@ static int load_free_space_bitmaps(struct btrfs_caching_control *caching_ctl, } } if (prev_bit == 1) { - total_found += add_new_free_space(block_group, extent_start, - end); + ret = add_new_free_space(block_group, extent_start, end, NULL); + if (ret) + goto out; extent_count++; } @@ -1569,6 +1574,8 @@ static int load_free_space_extents(struct btrfs_caching_control *caching_ctl, end = block_group->start + block_group->length; while (1) { + u64 space_added; + ret = btrfs_next_item(root, path); if (ret < 0) goto out; @@ -1583,8 +1590,11 @@ static int load_free_space_extents(struct btrfs_caching_control *caching_ctl, ASSERT(key.type == BTRFS_FREE_SPACE_EXTENT_KEY); ASSERT(key.objectid < end && key.objectid + key.offset <= end); - total_found += add_new_free_space(block_group, key.objectid, - key.objectid + key.offset); + ret = add_new_free_space(block_group, key.objectid, + key.objectid + key.offset, &space_added); + if (ret) + goto out; + total_found += space_added; if (total_found > CACHING_CTL_WAKE_UP) { total_found = 0; wake_up(&caching_ctl->wait); |