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authorSu Yue <l@damenly.su>2021-02-11 09:38:28 +0100
committerDavid Sterba <dsterba@suse.com>2021-02-12 14:48:24 +0100
commit83c68bbcb6ac2dbbcaf12e2281a29a9f73b97d0f (patch)
tree1f096452c2e5b57c033eeeb41018983b8dfd3a1e /fs/btrfs/disk-io.c
parentbtrfs: fix log replay failure due to race with space cache rebuild (diff)
downloadlinux-83c68bbcb6ac2dbbcaf12e2281a29a9f73b97d0f.tar.xz
linux-83c68bbcb6ac2dbbcaf12e2281a29a9f73b97d0f.zip
btrfs: initialize fs_info::csum_size earlier in open_ctree
User reported that btrfs-progs misc-tests/028-superblock-recover fails: [TEST/misc] 028-superblock-recover unexpected success: mounted fs with corrupted superblock test failed for case 028-superblock-recover The test case expects that a broken image with bad superblock will be rejected to be mounted. However, the test image just passed csum check of superblock and was successfully mounted. Commit 55fc29bed8dd ("btrfs: use cached value of fs_info::csum_size everywhere") replaces all calls to btrfs_super_csum_size by fs_info::csum_size. The calls include the place where fs_info->csum_size is not initialized. So btrfs_check_super_csum() passes because memcmp() with len 0 always returns 0. Fix it by caching csum size in btrfs_fs_info::csum_size once we know the csum type in superblock is valid in open_ctree(). Link: https://github.com/kdave/btrfs-progs/issues/250 Fixes: 55fc29bed8dd ("btrfs: use cached value of fs_info::csum_size everywhere") Signed-off-by: Su Yue <l@damenly.su> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to '')
-rw-r--r--fs/btrfs/disk-io.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 6b35b7e88136..07a2b4f69b10 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -3044,6 +3044,8 @@ int __cold open_ctree(struct super_block *sb, struct btrfs_fs_devices *fs_device
goto fail_alloc;
}
+ fs_info->csum_size = btrfs_super_csum_size(disk_super);
+
ret = btrfs_init_csum_hash(fs_info, csum_type);
if (ret) {
err = ret;
@@ -3161,7 +3163,6 @@ int __cold open_ctree(struct super_block *sb, struct btrfs_fs_devices *fs_device
fs_info->nodesize = nodesize;
fs_info->sectorsize = sectorsize;
fs_info->sectorsize_bits = ilog2(sectorsize);
- fs_info->csum_size = btrfs_super_csum_size(disk_super);
fs_info->csums_per_leaf = BTRFS_MAX_ITEM_SIZE(fs_info) / fs_info->csum_size;
fs_info->stripesize = stripesize;