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authorJosef Bacik <josef@toxicpanda.com>2023-09-05 12:15:23 -0400
committerDavid Sterba <dsterba@suse.com>2023-09-21 18:52:20 +0200
commit20218dfbaa31b8d3ef842fafcc7eb4c6aa03f80a (patch)
tree3e6af844981424f93aad1f799e7b053d46926e3d /fs/btrfs
parent74ee79142c0a344d4eae2eb7012ebc4e82254109 (diff)
btrfs: make sure to initialize start and len in find_free_dev_extent
Jens reported a compiler error when using CONFIG_CC_OPTIMIZE_FOR_SIZE=y that looks like this In function ‘gather_device_info’, inlined from ‘btrfs_create_chunk’ at fs/btrfs/volumes.c:5507:8: fs/btrfs/volumes.c:5245:48: warning: ‘dev_offset’ may be used uninitialized [-Wmaybe-uninitialized] 5245 | devices_info[ndevs].dev_offset = dev_offset; | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~ fs/btrfs/volumes.c: In function ‘btrfs_create_chunk’: fs/btrfs/volumes.c:5196:13: note: ‘dev_offset’ was declared here 5196 | u64 dev_offset; This occurs because find_free_dev_extent is responsible for setting dev_offset, however if we get an -ENOMEM at the top of the function we'll return without setting the value. This isn't actually a problem because we will see the -ENOMEM in gather_device_info() and return and not use the uninitialized value, however we also just don't want the compiler warning so rework the code slightly in find_free_dev_extent() to make sure it's always setting *start and *len to avoid the compiler warning. Reported-by: Jens Axboe <axboe@kernel.dk> Tested-by: Jens Axboe <axboe@kernel.dk> Reviewed-by: Qu Wenruo <wqu@suse.com> Signed-off-by: Josef Bacik <josef@toxicpanda.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs')
-rw-r--r--fs/btrfs/volumes.c13
1 files changed, 6 insertions, 7 deletions
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 733842136163..e3a3769fd92e 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -1594,7 +1594,7 @@ static int find_free_dev_extent(struct btrfs_device *device, u64 num_bytes,
u64 search_start;
u64 hole_size;
u64 max_hole_start;
- u64 max_hole_size;
+ u64 max_hole_size = 0;
u64 extent_end;
u64 search_end = device->total_bytes;
int ret;
@@ -1602,17 +1602,16 @@ static int find_free_dev_extent(struct btrfs_device *device, u64 num_bytes,
struct extent_buffer *l;
search_start = dev_extent_search_start(device);
+ max_hole_start = search_start;
WARN_ON(device->zone_info &&
!IS_ALIGNED(num_bytes, device->zone_info->zone_size));
path = btrfs_alloc_path();
- if (!path)
- return -ENOMEM;
-
- max_hole_start = search_start;
- max_hole_size = 0;
-
+ if (!path) {
+ ret = -ENOMEM;
+ goto out;
+ }
again:
if (search_start >= search_end ||
test_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state)) {