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Patch fixes ZFS root filesystem dataset identification issues.
This patch was mostly extracted from gub upstream commit f96df6fe9f6faa328c82820af88f14af07b2c9b9.
See Gentoo Bugzilla https://bugs.gentoo.org/956414 for further details.
diff --git a/grub-core/Makefile.core.def b/grub-core/Makefile.core.def
index 7fa9446bd..705d73fab 100644
--- a/grub-core/Makefile.core.def
+++ b/grub-core/Makefile.core.def
@@ -1601,6 +1601,7 @@ module = {
common = fs/zfs/zfs_lz4.c;
common = fs/zfs/zfs_sha256.c;
common = fs/zfs/zfs_fletcher.c;
+ cppflags = '-I$(srcdir)/lib/posix_wrap -I$(srcdir)/lib/zstd';
};
module = {
diff --git a/grub-core/fs/zfs/zfs.c b/grub-core/fs/zfs/zfs.c
index b5453e006..3fdf9bda8 100644
--- a/grub-core/fs/zfs/zfs.c
+++ b/grub-core/fs/zfs/zfs.c
@@ -57,6 +57,8 @@
#include <grub/i18n.h>
#include <grub/safemath.h>
+#include <zstd.h>
+
GRUB_MOD_LICENSE ("GPLv3+");
#define ZPOOL_PROP_BOOTFS "bootfs"
@@ -291,6 +293,9 @@ static const char *spa_feature_names[] = {
"com.delphix:embedded_data",
"com.delphix:extensible_dataset",
"org.open-zfs:large_blocks",
+ "com.klarasystems:vdev_zaps_v2",
+ "com.delphix:head_errlog",
+ "org.freebsd:zstd_compress",
NULL
};
@@ -312,6 +317,40 @@ zlib_decompress (void *s, void *d,
return grub_errno;
}
+static grub_err_t
+zstd_decompress (void *ibuf, void *obuf, grub_size_t isize,
+ grub_size_t osize)
+{
+ grub_size_t zstd_ret;
+ grub_uint32_t c_len;
+ grub_uint8_t *byte_buf = (grub_uint8_t *) ibuf;
+
+ if (isize < 8)
+ return grub_error (GRUB_ERR_BAD_COMPRESSED_DATA, "zstd data too short");
+
+ c_len = grub_be_to_cpu32 (grub_get_unaligned32 (byte_buf));
+
+ if (c_len > isize - 8)
+ return grub_error (GRUB_ERR_BAD_COMPRESSED_DATA,
+ "zstd data announced size overflow");
+
+ /*
+ * ZFS uses non-stadard magic for zstd streams. Rather than adjusting
+ * library functions, replace non-standard magic with standard one.
+ */
+ byte_buf[4] = 0x28;
+ byte_buf[5] = 0xb5;
+ byte_buf[6] = 0x2f;
+ byte_buf[7] = 0xfd;
+ zstd_ret = ZSTD_decompress (obuf, osize, byte_buf + 4, c_len + 4);
+
+ if (ZSTD_isError (zstd_ret))
+ return grub_error (GRUB_ERR_BAD_COMPRESSED_DATA,
+ "zstd data corrupted (error %d)", (int) zstd_ret);
+
+ return GRUB_ERR_NONE;
+}
+
static grub_err_t
zle_decompress (void *s, void *d,
grub_size_t slen, grub_size_t dlen)
@@ -362,6 +401,7 @@ static decomp_entry_t decomp_table[ZIO_COMPRESS_FUNCTIONS] = {
{"gzip-9", zlib_decompress}, /* ZIO_COMPRESS_GZIP9 */
{"zle", zle_decompress}, /* ZIO_COMPRESS_ZLE */
{"lz4", lz4_decompress}, /* ZIO_COMPRESS_LZ4 */
+ {"zstd", zstd_decompress}, /* ZIO_COMPRESS_ZSTD */
};
static grub_err_t zio_read_data (blkptr_t * bp, grub_zfs_endian_t endian,
diff --git a/include/grub/zfs/zio.h b/include/grub/zfs/zio.h
index 19ce136bb..997b0c4d4 100644
--- a/include/grub/zfs/zio.h
+++ b/include/grub/zfs/zio.h
@@ -89,6 +89,7 @@ enum zio_compress {
ZIO_COMPRESS_GZIP9,
ZIO_COMPRESS_ZLE,
ZIO_COMPRESS_LZ4,
+ ZIO_COMPRESS_ZSTD,
ZIO_COMPRESS_FUNCTIONS
};
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