btrfs: scrub: remove impossible sanity checks

There are several sanity checks which are no longer possible to trigger
inside btrfs_scrub_dev().

Since we have mount time check against super block nodesize/sectorsize,
and our fixed macro is hardcoded to handle even the worst combination.

Thus those sanity checks are no longer needed, can be easily removed.

But this patch still uses some ASSERT()s as a safe net just in case we
change some features in the future to trigger those impossible
combinations.

Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/scrub.c b/fs/btrfs/scrub.c
index d05025034b0aae0ef1bc84fca170a1a2beb66ae3..c4e030661fac337944a192c36b759bc5ed17ee0e 100644 (file)
--- a/fs/btrfs/scrub.c
+++ b/fs/btrfs/scrub.c
@@ -4096,32 +4096,16 @@ int btrfs_scrub_dev(struct btrfs_fs_info *fs_info, u64 devid, u64 start,
        if (btrfs_fs_closing(fs_info))
                return -EAGAIN;
 
-       if (fs_info->nodesize > BTRFS_STRIPE_LEN) {
-               /*
-                * in this case scrub is unable to calculate the checksum
-                * the way scrub is implemented. Do not handle this
-                * situation at all because it won't ever happen.
-                */
-               btrfs_err(fs_info,
-                          "scrub: size assumption nodesize <= BTRFS_STRIPE_LEN (%d <= %d) fails",
-                      fs_info->nodesize,
-                      BTRFS_STRIPE_LEN);
-               return -EINVAL;
-       }
+       /* At mount time we have ensured nodesize is in the range of [4K, 64K]. */
+       ASSERT(fs_info->nodesize <= BTRFS_STRIPE_LEN);
 
-       if (fs_info->nodesize >
-           SCRUB_MAX_SECTORS_PER_BLOCK << fs_info->sectorsize_bits ||
-           fs_info->sectorsize > PAGE_SIZE * SCRUB_MAX_SECTORS_PER_BLOCK) {
-               /*
-                * Would exhaust the array bounds of sectorv member in
-                * struct scrub_block
-                */
-               btrfs_err(fs_info,
-"scrub: nodesize and sectorsize <= SCRUB_MAX_SECTORS_PER_BLOCK (%d <= %d && %d <= %d) fails",
-                      fs_info->nodesize, SCRUB_MAX_SECTORS_PER_BLOCK,
-                      fs_info->sectorsize, SCRUB_MAX_SECTORS_PER_BLOCK);
-               return -EINVAL;
-       }
+       /*
+        * SCRUB_MAX_SECTORS_PER_BLOCK is calculated using the largest possible
+        * value (max nodesize / min sectorsize), thus nodesize should always
+        * be fine.
+        */
+       ASSERT(fs_info->nodesize <=
+              SCRUB_MAX_SECTORS_PER_BLOCK << fs_info->sectorsize_bits);
 
        /* Allocate outside of device_list_mutex */
        sctx = scrub_setup_ctx(fs_info, is_dev_replace);