fs: btrfs: Crossport btrfs_read_dev_super() from btrfs-progs

This patch uses generic code from btrfs-progs to read one super block
from block device.

To support the btrfs-progs coding style, the following is also
crossported:
- BTRFS_SETGET_FUNC for btrfs_super_block
- btrfs_check_super() function
- Move btrfs_read_superblock() to disk-io.[ch]
  Since super.c only contains pretty small amount of code, and
  the extra check will be covered in later root read patches.

Differences between this implementation and btrfs-progs:
- No sbflags/sb_bytenr support
  Since we only need to read the primary super block (like kernel),
  sbflags/sb_bytenr used by super block recovery is not needed.

This also changes the following behavior of U-Boot btrfs:
- Only reads the primary super block
  The old implementation reads all 3 super blocks, and also one
  non-existing backup.
  This is not correct, especially if there is another filesystem created
  on the device but old superblocks are not rewritten.

  Just like kernel, we only check the primary super block.

Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: Marek Behún <marek.behun@nic.cz>
[trini: Change error to be a define in compat.h]
Signed-off-by: Tom Rini <trini@konsulko.com>

1 files changed, 32 insertions, 0 deletions

diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index 28f98d43ad..1d8f7e168f 100644
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -10,6 +10,38 @@
 #include <malloc.h>
 #include <memalign.h>
 
+static const struct btrfs_csum {
+	u16 size;
+	const char name[14];
+} btrfs_csums[] = {
+	[BTRFS_CSUM_TYPE_CRC32]		= {  4, "crc32c" },
+	[BTRFS_CSUM_TYPE_XXHASH]	= {  8, "xxhash64" },
+	[BTRFS_CSUM_TYPE_SHA256]	= { 32, "sha256" },
+	[BTRFS_CSUM_TYPE_BLAKE2]	= { 32, "blake2" },
+};
+
+u16 btrfs_super_csum_size(const struct btrfs_super_block *sb)
+{
+	const u16 csum_type = btrfs_super_csum_type(sb);
+
+	return btrfs_csums[csum_type].size;
+}
+
+const char *btrfs_super_csum_name(u16 csum_type)
+{
+	return btrfs_csums[csum_type].name;
+}
+
+size_t btrfs_super_num_csums(void)
+{
+	return ARRAY_SIZE(btrfs_csums);
+}
+
+u16 btrfs_csum_type_size(u16 csum_type)
+{
+	return btrfs_csums[csum_type].size;
+}
+
 int btrfs_comp_keys(struct btrfs_key *a, struct btrfs_key *b)
 {
 	if (a->objectid > b->objectid)