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btrfs: make sure btrfs_io_context::fs_info is always initialized 

Currently btrfs_io_context::fs_info is only initialized in
btrfs_map_bio, but there are call sites like btrfs_map_sblock() which
calls __btrfs_map_block() directly, leaving bioc::fs_info uninitialized
(NULL).

Currently this is fine, but later cleanup will rely on bioc::fs_info to
grab fs_info, and this can be a hidden problem for such usage.

This patch will remove such hidden uninitialized member by always
assigning bioc::fs_info at alloc_btrfs_io_context().

Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Qu Wenruo 2021-09-23 14:00:08 +08:00 committed by David Sterba
parent 49d0c6424c
commit 731ccf15c9
1 changed files with 5 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
fs/btrfs/volumes.c
View File

@ -5807,7 +5807,8 @@ static void sort_parity_stripes(struct btrfs_io_context *bioc, int num_stripes)
}
}
static struct btrfs_io_context *alloc_btrfs_io_context(int total_stripes,
static struct btrfs_io_context *alloc_btrfs_io_context(struct btrfs_fs_info *fs_info,
int total_stripes,
int real_stripes)
{
struct btrfs_io_context *bioc = kzalloc(
@ -5827,6 +5828,7 @@ static struct btrfs_io_context *alloc_btrfs_io_context(int total_stripes,
atomic_set(&bioc->error, 0);
refcount_set(&bioc->refs, 1);
bioc->fs_info = fs_info;
bioc->tgtdev_map = (int *)(bioc->stripes + total_stripes);
bioc->raid_map = (u64 *)(bioc->tgtdev_map + real_stripes);
@ -5941,7 +5943,7 @@ static int __btrfs_map_block_for_discard(struct btrfs_fs_info *fs_info,
&stripe_index);
}
bioc = alloc_btrfs_io_context(num_stripes, 0);
bioc = alloc_btrfs_io_context(fs_info, num_stripes, 0);
if (!bioc) {
ret = -ENOMEM;
goto out;
@ -6463,7 +6465,7 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info,
tgtdev_indexes = num_stripes;
}
bioc = alloc_btrfs_io_context(num_alloc_stripes, tgtdev_indexes);
bioc = alloc_btrfs_io_context(fs_info, num_alloc_stripes, tgtdev_indexes);
if (!bioc) {
ret = -ENOMEM;
goto out;
@ -6699,7 +6701,6 @@ blk_status_t btrfs_map_bio(struct btrfs_fs_info *fs_info, struct bio *bio,
bioc->orig_bio = first_bio;
bioc->private = first_bio->bi_private;
bioc->end_io = first_bio->bi_end_io;
bioc->fs_info = fs_info;
atomic_set(&bioc->stripes_pending, bioc->num_stripes);
if ((bioc->map_type & BTRFS_BLOCK_GROUP_RAID56_MASK) &&