On Mon, Aug 27, 2018 at 06:36:54PM -0700, Nick Terrell wrote:
> Adds zstd support to the btrfs module. I'm not sure that my changes to the
> Makefiles are correct, please let me know if I need to do something
> differently.
>
> Tested on Ubuntu-18.04 with a btrfs /boot partition with and without zstd
> compression. A test case was also added to the test suite that fails before
> the patch, and passes after.
>
> Signed-off-by: Nick Terrell <terre...@fb.com>
> ---
> Makefile.util.def | 8 ++++-
> grub-core/Makefile.core.def | 10 ++++--
> grub-core/fs/btrfs.c | 85
> +++++++++++++++++++++++++++++++++++++++++++-
> tests/btrfs_test.in | 1 +
> tests/util/grub-fs-tester.in | 4 +--
> 5 files changed, 102 insertions(+), 6 deletions(-)
>
> diff --git a/Makefile.util.def b/Makefile.util.def
> index 3180ac880..b987dc637 100644
> --- a/Makefile.util.def
> +++ b/Makefile.util.def
> @@ -54,7 +54,7 @@ library = {
> library = {
> name = libgrubmods.a;
> cflags = '-fno-builtin -Wno-undef';
> - cppflags = '-I$(top_srcdir)/grub-core/lib/minilzo
> -I$(srcdir)/grub-core/lib/xzembed -DMINILZO_HAVE_CONFIG_H';
> + cppflags = '-I$(top_srcdir)/grub-core/lib/minilzo
> -I$(srcdir)/grub-core/lib/xzembed -I$(top_srcdir)/grub-core/lib/zstd
> -DMINILZO_HAVE_CONFIG_H';
>
> common_nodist = grub_script.tab.c;
> common_nodist = grub_script.yy.c;
> @@ -165,6 +165,12 @@ library = {
> common = grub-core/lib/xzembed/xz_dec_bcj.c;
> common = grub-core/lib/xzembed/xz_dec_lzma2.c;
> common = grub-core/lib/xzembed/xz_dec_stream.c;
> + common = grub-core/lib/zstd/zstd_common.c;
> + common = grub-core/lib/zstd/huf_decompress.c;
> + common = grub-core/lib/zstd/fse_decompress.c;
> + common = grub-core/lib/zstd/entropy_common.c;
> + common = grub-core/lib/zstd/decompress.c;
> + common = grub-core/lib/zstd/xxhash.c;
> };
>
> program = {
> diff --git a/grub-core/Makefile.core.def b/grub-core/Makefile.core.def
> index 9590e87d9..c24bf9147 100644
> --- a/grub-core/Makefile.core.def
> +++ b/grub-core/Makefile.core.def
> @@ -404,7 +404,7 @@ image = {
> i386_pc = boot/i386/pc/boot.S;
>
> cppflags = '-DHYBRID_BOOT=1';
> -
> +
Please do not introduce such noise...
> i386_pc_ldflags = '$(TARGET_IMG_LDFLAGS)';
> i386_pc_ldflags = '$(TARGET_IMG_BASE_LDOPT),0x7C00';
>
> @@ -1264,8 +1264,14 @@ module = {
> name = btrfs;
> common = fs/btrfs.c;
> common = lib/crc.c;
> + common = lib/zstd/zstd_common.c;
> + common = lib/zstd/huf_decompress.c;
> + common = lib/zstd/fse_decompress.c;
> + common = lib/zstd/entropy_common.c;
> + common = lib/zstd/decompress.c;
> + common = lib/zstd/xxhash.c;
> cflags = '$(CFLAGS_POSIX) -Wno-undef';
> - cppflags = '-I$(srcdir)/lib/posix_wrap -I$(srcdir)/lib/minilzo
> -DMINILZO_HAVE_CONFIG_H';
> + cppflags = '-I$(srcdir)/lib/posix_wrap -I$(srcdir)/lib/minilzo
> -I$(srcdir)/lib/zstd -DMINILZO_HAVE_CONFIG_H';
> };
>
> module = {
> diff --git a/grub-core/fs/btrfs.c b/grub-core/fs/btrfs.c
> index be195448d..89ed4884e 100644
> --- a/grub-core/fs/btrfs.c
> +++ b/grub-core/fs/btrfs.c
> @@ -27,6 +27,7 @@
> #include <grub/lib/crc.h>
> #include <grub/deflate.h>
> #include <minilzo.h>
> +#include <zstd.h>
> #include <grub/i18n.h>
> #include <grub/btrfs.h>
>
> @@ -45,6 +46,9 @@ GRUB_MOD_LICENSE ("GPLv3+");
> #define GRUB_BTRFS_LZO_BLOCK_MAX_CSIZE (GRUB_BTRFS_LZO_BLOCK_SIZE + \
> (GRUB_BTRFS_LZO_BLOCK_SIZE / 16) + 64 + 3)
>
> +#define ZSTD_BTRFS_MAX_WINDOWLOG 17
> +#define ZSTD_BTRFS_MAX_INPUT (1 << ZSTD_BTRFS_MAX_WINDOWLOG)
Please align stuff properly, i.e.
#define ZSTD_BTRFS_MAX_WINDOWLOG 17
#define ZSTD_BTRFS_MAX_INPUT (1 << ZSTD_BTRFS_MAX_WINDOWLOG)
> +
> typedef grub_uint8_t grub_btrfs_checksum_t[0x20];
> typedef grub_uint16_t grub_btrfs_uuid_t[8];
>
> @@ -212,6 +216,7 @@ struct grub_btrfs_extent_data
> #define GRUB_BTRFS_COMPRESSION_NONE 0
> #define GRUB_BTRFS_COMPRESSION_ZLIB 1
> #define GRUB_BTRFS_COMPRESSION_LZO 2
> +#define GRUB_BTRFS_COMPRESSION_ZSTD 3
Ditto.
> #define GRUB_BTRFS_OBJECT_ID_CHUNK 0x100
>
> @@ -912,6 +917,70 @@ grub_btrfs_read_inode (struct grub_btrfs_data *data,
> return grub_btrfs_read_logical (data, elemaddr, inode, sizeof (*inode), 0);
> }
>
> +static grub_ssize_t
> +grub_btrfs_zstd_decompress(char *ibuf, grub_size_t isize, grub_off_t off,
> + char *obuf, grub_size_t osize)
> +{
> + void *allocated = NULL;
> + char *otmpbuf = obuf;
> + grub_size_t otmpsize = osize;
> + void *wmem = NULL;
> + const grub_size_t wmem_size = ZSTD_DCtxWorkspaceBound ();
> + ZSTD_DCtx *dctx;
> + grub_size_t zstd_ret;
> + grub_ssize_t ret = -1;
> +
> + /* Zstd will fail if it can't fit the entire output in the destination
> + * buffer, so if osize isn't large enough, allocate a temporary buffer.
> + */
> + if (otmpsize < ZSTD_BTRFS_MAX_INPUT) {
> + allocated = grub_malloc (ZSTD_BTRFS_MAX_INPUT);
> + if (!allocated) {
> + grub_dprintf ("zstd", "outtmpbuf allocation failed\n");
> + goto out;
> + }
> + otmpbuf = (char*)allocated;
> + otmpsize = ZSTD_BTRFS_MAX_INPUT;
> + }
> +
> + /* Allocate space for, and initialize, the ZSTD_DCtx. */
> + wmem = grub_malloc (wmem_size);
> + if (!wmem) {
> + grub_dprintf ("zstd", "wmem allocation failed\n");
> + goto out;
> + }
> + dctx = ZSTD_initDCtx (wmem, wmem_size);
> +
> + /* Get the real input size, there may be junk at the
> + * end of the frame.
> + */
> + isize = ZSTD_findFrameCompressedSize (ibuf, isize);
> + if (ZSTD_isError (isize)) {
> + grub_dprintf ("zstd", "first frame is invalid %d\n",
> + (int)ZSTD_getErrorCode (isize));
> + goto out;
> + }
> +
> + /* Decompress and check for errors */
> + zstd_ret = ZSTD_decompressDCtx (dctx, otmpbuf, otmpsize, ibuf, isize);
> + if (ZSTD_isError (zstd_ret)) {
> + grub_dprintf ("zstd", "zstd failed with code %d\n",
> + (int)ZSTD_getErrorCode (zstd_ret));
> + goto out;
> + }
> +
> + /* Move the requested data into the obuf.
> + * obuf may be equal to otmpbuf, which is why grub_memmove() is
> required.
> + */
> + grub_memmove (obuf, otmpbuf + off, osize);
> + ret = osize;
> +
> +out:
s/out/err/
> + grub_free (allocated);
> + grub_free (wmem);
> + return ret;
> +}
> +
> static grub_ssize_t
> grub_btrfs_lzo_decompress(char *ibuf, grub_size_t isize, grub_off_t off,
> char *obuf, grub_size_t osize)
> @@ -1087,7 +1156,8 @@ grub_btrfs_extent_read (struct grub_btrfs_data *data,
>
> if (data->extent->compression != GRUB_BTRFS_COMPRESSION_NONE
> && data->extent->compression != GRUB_BTRFS_COMPRESSION_ZLIB
> - && data->extent->compression != GRUB_BTRFS_COMPRESSION_LZO)
> + && data->extent->compression != GRUB_BTRFS_COMPRESSION_LZO
> + && data->extent->compression != GRUB_BTRFS_COMPRESSION_ZSTD)
> {
> grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET,
> "compression type 0x%x not supported",
> @@ -1127,6 +1197,15 @@ grub_btrfs_extent_read (struct grub_btrfs_data *data,
> != (grub_ssize_t) csize)
> return -1;
> }
> + else if (data->extent->compression == GRUB_BTRFS_COMPRESSION_ZSTD)
> + {
> + if (grub_btrfs_zstd_decompress(data->extent->inl, data->extsize -
> + ((grub_uint8_t *) data->extent->inl
> + - (grub_uint8_t *) data->extent),
> + extoff, buf, csize)
> + != (grub_ssize_t) csize)
> + return -1;
> + }
> else
> grub_memcpy (buf, data->extent->inl + extoff, csize);
> break;
> @@ -1164,6 +1243,10 @@ grub_btrfs_extent_read (struct grub_btrfs_data *data,
> ret = grub_btrfs_lzo_decompress (tmp, zsize, extoff
> + grub_le_to_cpu64 (data->extent->offset),
> buf, csize);
> + else if (data->extent->compression == GRUB_BTRFS_COMPRESSION_ZSTD)
> + ret = grub_btrfs_zstd_decompress (tmp, zsize, extoff
> + + grub_le_to_cpu64 (data->extent->offset),
> + buf, csize);
> else
> ret = -1;
>
> diff --git a/tests/btrfs_test.in b/tests/btrfs_test.in
> index 2b37ddd33..0c9bf3a68 100644
> --- a/tests/btrfs_test.in
> +++ b/tests/btrfs_test.in
> @@ -18,6 +18,7 @@ fi
> "@builddir@/grub-fs-tester" btrfs
> "@builddir@/grub-fs-tester" btrfs_zlib
> "@builddir@/grub-fs-tester" btrfs_lzo
> +"@builddir@/grub-fs-tester" btrfs_zstd
> "@builddir@/grub-fs-tester" btrfs_raid0
> "@builddir@/grub-fs-tester" btrfs_raid1
> "@builddir@/grub-fs-tester" btrfs_single
> diff --git a/tests/util/grub-fs-tester.in b/tests/util/grub-fs-tester.in
> index ef65fbc93..147d946d2 100644
> --- a/tests/util/grub-fs-tester.in
> +++ b/tests/util/grub-fs-tester.in
> @@ -600,7 +600,7 @@ for LOGSECSIZE in $(range "$MINLOGSECSIZE"
> "$MAXLOGSECSIZE" 1); do
> GENERATED=n
> LODEVICES=
> MOUNTDEVICE=
> -
> +
Ditto.
Daniel
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