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grub/grub-core/fs/zfs/zfs.c
Vladimir 'phcoder' Serbinenko 5bbd28b8ce Fix 2G limit on ZFS. 
* grub-core/fs/zfs/zfs.c (zio_checksum_verify): Use more appropriate
	types.
	(uberblock_verify): Likewise.
	(dmu_read): Likewise.
	(grub_zfs_read): Likewise. Remove invalid cast.
2011-10-24 21:33:35 +02:00

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/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 1999,2000,2001,2002,2003,2004,2009,2010 Free Software Foundation, Inc.
* Copyright 2010 Sun Microsystems, Inc.
*
* GRUB is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* GRUB is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
*/
/*
* The zfs plug-in routines for GRUB are:
*
* zfs_mount() - locates a valid uberblock of the root pool and reads
* in its MOS at the memory address MOS.
*
* zfs_open() - locates a plain file object by following the MOS
* and places its dnode at the memory address DNODE.
*
* zfs_read() - read in the data blocks pointed by the DNODE.
*
*/
#include <grub/err.h>
#include <grub/file.h>
#include <grub/mm.h>
#include <grub/misc.h>
#include <grub/disk.h>
#include <grub/partition.h>
#include <grub/dl.h>
#include <grub/types.h>
#include <grub/zfs/zfs.h>
#include <grub/zfs/zio.h>
#include <grub/zfs/dnode.h>
#include <grub/zfs/uberblock_impl.h>
#include <grub/zfs/vdev_impl.h>
#include <grub/zfs/zio_checksum.h>
#include <grub/zfs/zap_impl.h>
#include <grub/zfs/zap_leaf.h>
#include <grub/zfs/zfs_znode.h>
#include <grub/zfs/dmu.h>
#include <grub/zfs/dmu_objset.h>
#include <grub/zfs/sa_impl.h>
#include <grub/zfs/dsl_dir.h>
#include <grub/zfs/dsl_dataset.h>
#include <grub/deflate.h>
GRUB_MOD_LICENSE ("GPLv3+");
#define ZPOOL_PROP_BOOTFS "bootfs"
#define MIN(a,b) (((a) < (b)) ? (a) : (b))
/*
* For nvlist manipulation. (from nvpair.h)
*/
#define NV_ENCODE_NATIVE 0
#define NV_ENCODE_XDR 1
#define NV_BIG_ENDIAN 0
#define NV_LITTLE_ENDIAN 1
#define DATA_TYPE_UINT64 8
#define DATA_TYPE_STRING 9
#define DATA_TYPE_NVLIST 19
#define DATA_TYPE_NVLIST_ARRAY 20
#ifndef GRUB_UTIL
static grub_dl_t my_mod;
#endif
#define P2PHASE(x, align) ((x) & ((align) - 1))
#define DVA_OFFSET_TO_PHYS_SECTOR(offset) \
((offset + VDEV_LABEL_START_SIZE) >> SPA_MINBLOCKSHIFT)
/*
* FAT ZAP data structures
*/
#define ZFS_CRC64_POLY 0xC96C5795D7870F42ULL /* ECMA-182, reflected form */
#define ZAP_HASH_IDX(hash, n) (((n) == 0) ? 0 : ((hash) >> (64 - (n))))
#define CHAIN_END 0xffff /* end of the chunk chain */
/*
* The amount of space within the chunk available for the array is:
* chunk size - space for type (1) - space for next pointer (2)
*/
#define ZAP_LEAF_ARRAY_BYTES (ZAP_LEAF_CHUNKSIZE - 3)
#define ZAP_LEAF_HASH_SHIFT(bs) (bs - 5)
#define ZAP_LEAF_HASH_NUMENTRIES(bs) (1 << ZAP_LEAF_HASH_SHIFT(bs))
#define LEAF_HASH(bs, h) \
((ZAP_LEAF_HASH_NUMENTRIES(bs)-1) & \
((h) >> (64 - ZAP_LEAF_HASH_SHIFT(bs)-l->l_hdr.lh_prefix_len)))
/*
* The amount of space available for chunks is:
* block size shift - hash entry size (2) * number of hash
* entries - header space (2*chunksize)
*/
#define ZAP_LEAF_NUMCHUNKS(bs) \
(((1<<bs) - 2*ZAP_LEAF_HASH_NUMENTRIES(bs)) / \
ZAP_LEAF_CHUNKSIZE - 2)
/*
* The chunks start immediately after the hash table. The end of the
* hash table is at l_hash + HASH_NUMENTRIES, which we simply cast to a
* chunk_t.
*/
#define ZAP_LEAF_CHUNK(l, bs, idx) \
((zap_leaf_chunk_t *)(l->l_hash + ZAP_LEAF_HASH_NUMENTRIES(bs)))[idx]
#define ZAP_LEAF_ENTRY(l, bs, idx) (&ZAP_LEAF_CHUNK(l, bs, idx).l_entry)
/*
* Decompression Entry - lzjb
*/
#ifndef NBBY
#define NBBY 8
#endif
extern grub_err_t lzjb_decompress (void *, void *, grub_size_t, grub_size_t);
typedef grub_err_t zfs_decomp_func_t (void *s_start, void *d_start,
grub_size_t s_len, grub_size_t d_len);
typedef struct decomp_entry
{
char *name;
zfs_decomp_func_t *decomp_func;
} decomp_entry_t;
typedef struct dnode_end
{
dnode_phys_t dn;
grub_zfs_endian_t endian;
} dnode_end_t;
struct grub_zfs_data
{
/* cache for a file block of the currently zfs_open()-ed file */
char *file_buf;
grub_uint64_t file_start;
grub_uint64_t file_end;
/* cache for a dnode block */
dnode_phys_t *dnode_buf;
dnode_phys_t *dnode_mdn;
grub_uint64_t dnode_start;
grub_uint64_t dnode_end;
grub_zfs_endian_t dnode_endian;
uberblock_t current_uberblock;
grub_disk_t disk;
dnode_end_t mos;
dnode_end_t mdn;
dnode_end_t dnode;
grub_disk_addr_t vdev_phys_sector;
};
static grub_err_t
zlib_decompress (void *s, void *d,
grub_size_t slen, grub_size_t dlen)
{
if (grub_zlib_decompress (s, slen, 0, d, dlen) < 0)
return grub_errno;
return GRUB_ERR_NONE;
}
static decomp_entry_t decomp_table[ZIO_COMPRESS_FUNCTIONS] = {
{"inherit", NULL}, /* ZIO_COMPRESS_INHERIT */
{"on", lzjb_decompress}, /* ZIO_COMPRESS_ON */
{"off", NULL}, /* ZIO_COMPRESS_OFF */
{"lzjb", lzjb_decompress}, /* ZIO_COMPRESS_LZJB */
{"empty", NULL}, /* ZIO_COMPRESS_EMPTY */
{"gzip-1", zlib_decompress}, /* ZIO_COMPRESS_GZIP1 */
{"gzip-2", zlib_decompress}, /* ZIO_COMPRESS_GZIP2 */
{"gzip-3", zlib_decompress}, /* ZIO_COMPRESS_GZIP3 */
{"gzip-4", zlib_decompress}, /* ZIO_COMPRESS_GZIP4 */
{"gzip-5", zlib_decompress}, /* ZIO_COMPRESS_GZIP5 */
{"gzip-6", zlib_decompress}, /* ZIO_COMPRESS_GZIP6 */
{"gzip-7", zlib_decompress}, /* ZIO_COMPRESS_GZIP7 */
{"gzip-8", zlib_decompress}, /* ZIO_COMPRESS_GZIP8 */
{"gzip-9", zlib_decompress}, /* ZIO_COMPRESS_GZIP9 */
};
static grub_err_t zio_read_data (blkptr_t * bp, grub_zfs_endian_t endian,
void *buf, struct grub_zfs_data *data);
/*
* Our own version of log2(). Same thing as highbit()-1.
*/
static int
zfs_log2 (grub_uint64_t num)
{
int i = 0;
while (num > 1)
{
i++;
num = num >> 1;
}
return (i);
}
/* Checksum Functions */
static void
zio_checksum_off (const void *buf __attribute__ ((unused)),
grub_uint64_t size __attribute__ ((unused)),
grub_zfs_endian_t endian __attribute__ ((unused)),
zio_cksum_t * zcp)
{
ZIO_SET_CHECKSUM (zcp, 0, 0, 0, 0);
}
/* Checksum Table and Values */
static zio_checksum_info_t zio_checksum_table[ZIO_CHECKSUM_FUNCTIONS] = {
{NULL, 0, 0, "inherit"},
{NULL, 0, 0, "on"},
{zio_checksum_off, 0, 0, "off"},
{zio_checksum_SHA256, 1, 1, "label"},
{zio_checksum_SHA256, 1, 1, "gang_header"},
{NULL, 0, 0, "zilog"},
{fletcher_2, 0, 0, "fletcher2"},
{fletcher_4, 1, 0, "fletcher4"},
{zio_checksum_SHA256, 1, 0, "SHA256"},
{NULL, 0, 0, "zilog2"},
};
/*
* zio_checksum_verify: Provides support for checksum verification.
*
* Fletcher2, Fletcher4, and SHA256 are supported.
*
*/
static grub_err_t
zio_checksum_verify (zio_cksum_t zc, grub_uint32_t checksum,
grub_zfs_endian_t endian, char *buf, grub_size_t size)
{
zio_eck_t *zec = (zio_eck_t *) (buf + size) - 1;
zio_checksum_info_t *ci = &zio_checksum_table[checksum];
zio_cksum_t actual_cksum, expected_cksum;
if (checksum >= ZIO_CHECKSUM_FUNCTIONS || ci->ci_func == NULL)
{
grub_dprintf ("zfs", "unknown checksum function %d\n", checksum);
return grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET,
"unknown checksum function %d", checksum);
}
if (ci->ci_eck)
{
expected_cksum = zec->zec_cksum;
zec->zec_cksum = zc;
ci->ci_func (buf, size, endian, &actual_cksum);
zec->zec_cksum = expected_cksum;
zc = expected_cksum;
}
else
ci->ci_func (buf, size, endian, &actual_cksum);
if ((actual_cksum.zc_word[0] != zc.zc_word[0])
|| (actual_cksum.zc_word[1] != zc.zc_word[1])
|| (actual_cksum.zc_word[2] != zc.zc_word[2])
|| (actual_cksum.zc_word[3] != zc.zc_word[3]))
{
grub_dprintf ("zfs", "checksum %d verification failed\n", checksum);
grub_dprintf ("zfs", "actual checksum %16llx %16llx %16llx %16llx\n",
(unsigned long long) actual_cksum.zc_word[0],
(unsigned long long) actual_cksum.zc_word[1],
(unsigned long long) actual_cksum.zc_word[2],
(unsigned long long) actual_cksum.zc_word[3]);
grub_dprintf ("zfs", "expected checksum %16llx %16llx %16llx %16llx\n",
(unsigned long long) zc.zc_word[0],
(unsigned long long) zc.zc_word[1],
(unsigned long long) zc.zc_word[2],
(unsigned long long) zc.zc_word[3]);
return grub_error (GRUB_ERR_BAD_FS, "checksum verification failed");
}
return GRUB_ERR_NONE;
}
/*
* vdev_uberblock_compare takes two uberblock structures and returns an integer
* indicating the more recent of the two.
* Return Value = 1 if ub2 is more recent
* Return Value = -1 if ub1 is more recent
* The most recent uberblock is determined using its transaction number and
* timestamp. The uberblock with the highest transaction number is
* considered "newer". If the transaction numbers of the two blocks match, the
* timestamps are compared to determine the "newer" of the two.
*/
static int
vdev_uberblock_compare (uberblock_t * ub1, uberblock_t * ub2)
{
grub_zfs_endian_t ub1_endian, ub2_endian;
if (grub_zfs_to_cpu64 (ub1->ub_magic, LITTLE_ENDIAN) == UBERBLOCK_MAGIC)
ub1_endian = LITTLE_ENDIAN;
else
ub1_endian = BIG_ENDIAN;
if (grub_zfs_to_cpu64 (ub2->ub_magic, LITTLE_ENDIAN) == UBERBLOCK_MAGIC)
ub2_endian = LITTLE_ENDIAN;
else
ub2_endian = BIG_ENDIAN;
if (grub_zfs_to_cpu64 (ub1->ub_txg, ub1_endian)
< grub_zfs_to_cpu64 (ub2->ub_txg, ub2_endian))
return (-1);
if (grub_zfs_to_cpu64 (ub1->ub_txg, ub1_endian)
> grub_zfs_to_cpu64 (ub2->ub_txg, ub2_endian))
return (1);
if (grub_zfs_to_cpu64 (ub1->ub_timestamp, ub1_endian)
< grub_zfs_to_cpu64 (ub2->ub_timestamp, ub2_endian))
return (-1);
if (grub_zfs_to_cpu64 (ub1->ub_timestamp, ub1_endian)
> grub_zfs_to_cpu64 (ub2->ub_timestamp, ub2_endian))
return (1);
return (0);
}
/*
* Three pieces of information are needed to verify an uberblock: the magic
* number, the version number, and the checksum.
*
* Currently Implemented: version number, magic number
* Need to Implement: checksum
*
*/
static grub_err_t
uberblock_verify (uberblock_phys_t * ub, grub_uint64_t offset)
{
uberblock_t *uber = &ub->ubp_uberblock;
grub_err_t err;
grub_zfs_endian_t endian = UNKNOWN_ENDIAN;
zio_cksum_t zc;
if (grub_zfs_to_cpu64 (uber->ub_magic, LITTLE_ENDIAN) == UBERBLOCK_MAGIC
&& grub_zfs_to_cpu64 (uber->ub_version, LITTLE_ENDIAN) > 0
&& grub_zfs_to_cpu64 (uber->ub_version, LITTLE_ENDIAN) <= SPA_VERSION)
endian = LITTLE_ENDIAN;
if (grub_zfs_to_cpu64 (uber->ub_magic, BIG_ENDIAN) == UBERBLOCK_MAGIC
&& grub_zfs_to_cpu64 (uber->ub_version, BIG_ENDIAN) > 0
&& grub_zfs_to_cpu64 (uber->ub_version, BIG_ENDIAN) <= SPA_VERSION)
endian = BIG_ENDIAN;
if (endian == UNKNOWN_ENDIAN)
return grub_error (GRUB_ERR_BAD_FS, "invalid uberblock magic");
grub_memset (&zc, 0, sizeof (zc));
zc.zc_word[0] = grub_cpu_to_zfs64 (offset, endian);
err = zio_checksum_verify (zc, ZIO_CHECKSUM_LABEL, endian,
(char *) ub, UBERBLOCK_SIZE);
return err;
}
/*
* Find the best uberblock.
* Return:
* Success - Pointer to the best uberblock.
* Failure - NULL
*/
static uberblock_phys_t *
find_bestub (uberblock_phys_t * ub_array, grub_disk_addr_t sector)
{
uberblock_phys_t *ubbest = NULL;
int i;
grub_disk_addr_t offset;
grub_err_t err = GRUB_ERR_NONE;
for (i = 0; i < (VDEV_UBERBLOCK_RING >> VDEV_UBERBLOCK_SHIFT); i++)
{
offset = (sector << SPA_MINBLOCKSHIFT) + VDEV_PHYS_SIZE
+ (i << VDEV_UBERBLOCK_SHIFT);
err = uberblock_verify (&ub_array[i], offset);
if (err)
{
grub_errno = GRUB_ERR_NONE;
continue;
}
if (ubbest == NULL
|| vdev_uberblock_compare (&(ub_array[i].ubp_uberblock),
&(ubbest->ubp_uberblock)) > 0)
ubbest = &ub_array[i];
}
if (!ubbest)
grub_errno = err;
return (ubbest);
}
static inline grub_size_t
get_psize (blkptr_t * bp, grub_zfs_endian_t endian)
{
return ((((grub_zfs_to_cpu64 ((bp)->blk_prop, endian) >> 16) & 0xffff) + 1)
<< SPA_MINBLOCKSHIFT);
}
static grub_uint64_t
dva_get_offset (dva_t * dva, grub_zfs_endian_t endian)
{
grub_dprintf ("zfs", "dva=%llx, %llx\n",
(unsigned long long) dva->dva_word[0],
(unsigned long long) dva->dva_word[1]);
return grub_zfs_to_cpu64 ((dva)->dva_word[1],
endian) << SPA_MINBLOCKSHIFT;
}
/*
* Read a block of data based on the gang block address dva,
* and put its data in buf.
*
*/
static grub_err_t
zio_read_gang (blkptr_t * bp, grub_zfs_endian_t endian, dva_t * dva, void *buf,
struct grub_zfs_data *data)
{
zio_gbh_phys_t *zio_gb;
grub_uint64_t offset, sector;
unsigned i;
grub_err_t err;
zio_cksum_t zc;
grub_memset (&zc, 0, sizeof (zc));
zio_gb = grub_malloc (SPA_GANGBLOCKSIZE);
if (!zio_gb)
return grub_errno;
grub_dprintf ("zfs", endian == LITTLE_ENDIAN ? "little-endian gang\n"
:"big-endian gang\n");
offset = dva_get_offset (dva, endian);
sector = DVA_OFFSET_TO_PHYS_SECTOR (offset);
grub_dprintf ("zfs", "offset=%llx\n", (unsigned long long) offset);
/* read in the gang block header */
err = grub_disk_read (data->disk, sector, 0, SPA_GANGBLOCKSIZE,
(char *) zio_gb);
if (err)
{
grub_free (zio_gb);
return err;
}
/* XXX */
/* self checksuming the gang block header */
ZIO_SET_CHECKSUM (&zc, DVA_GET_VDEV (dva),
dva_get_offset (dva, endian), bp->blk_birth, 0);
err = zio_checksum_verify (zc, ZIO_CHECKSUM_GANG_HEADER, endian,
(char *) zio_gb, SPA_GANGBLOCKSIZE);
if (err)
{
grub_free (zio_gb);
return err;
}
endian = (grub_zfs_to_cpu64 (bp->blk_prop, endian) >> 63) & 1;
for (i = 0; i < SPA_GBH_NBLKPTRS; i++)
{
if (zio_gb->zg_blkptr[i].blk_birth == 0)
continue;
err = zio_read_data (&zio_gb->zg_blkptr[i], endian, buf, data);
if (err)
{
grub_free (zio_gb);
return err;
}
buf = (char *) buf + get_psize (&zio_gb->zg_blkptr[i], endian);
}
grub_free (zio_gb);
return GRUB_ERR_NONE;
}
/*
* Read in a block of raw data to buf.
*/
static grub_err_t
zio_read_data (blkptr_t * bp, grub_zfs_endian_t endian, void *buf,
struct grub_zfs_data *data)
{
int i, psize;
grub_err_t err = GRUB_ERR_NONE;
psize = get_psize (bp, endian);
/* pick a good dva from the block pointer */
for (i = 0; i < SPA_DVAS_PER_BP; i++)
{
grub_uint64_t offset, sector;
if (bp->blk_dva[i].dva_word[0] == 0 && bp->blk_dva[i].dva_word[1] == 0)
continue;
if ((grub_zfs_to_cpu64 (bp->blk_dva[i].dva_word[1], endian)>>63) & 1)
err = zio_read_gang (bp, endian, &bp->blk_dva[i], buf, data);
else
{
/* read in a data block */
offset = dva_get_offset (&bp->blk_dva[i], endian);
sector = DVA_OFFSET_TO_PHYS_SECTOR (offset);
err = grub_disk_read (data->disk, sector, 0, psize, buf);
}
if (!err)
return GRUB_ERR_NONE;
grub_errno = GRUB_ERR_NONE;
}
if (!err)
err = grub_error (GRUB_ERR_BAD_FS, "couldn't find a valid DVA");
grub_errno = err;
return err;
}
/*
* Read in a block of data, verify its checksum, decompress if needed,
* and put the uncompressed data in buf.
*/
static grub_err_t
zio_read (blkptr_t * bp, grub_zfs_endian_t endian, void **buf,
grub_size_t *size, struct grub_zfs_data *data)
{
grub_size_t lsize, psize;
unsigned int comp;
char *compbuf = NULL;
grub_err_t err;
zio_cksum_t zc = bp->blk_cksum;
grub_uint32_t checksum;
*buf = NULL;
checksum = (grub_zfs_to_cpu64((bp)->blk_prop, endian) >> 40) & 0xff;
comp = (grub_zfs_to_cpu64((bp)->blk_prop, endian)>>32) & 0xff;
lsize = (BP_IS_HOLE(bp) ? 0 :
(((grub_zfs_to_cpu64 ((bp)->blk_prop, endian) & 0xffff) + 1)
<< SPA_MINBLOCKSHIFT));
psize = get_psize (bp, endian);
if (size)
*size = lsize;
if (comp >= ZIO_COMPRESS_FUNCTIONS)
return grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET,
"compression algorithm %u not supported\n", (unsigned int) comp);
if (comp != ZIO_COMPRESS_OFF && decomp_table[comp].decomp_func == NULL)
return grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET,
"compression algorithm %s not supported\n", decomp_table[comp].name);
if (comp != ZIO_COMPRESS_OFF)
{
compbuf = grub_malloc (psize);
if (! compbuf)
return grub_errno;
}
else
compbuf = *buf = grub_malloc (lsize);
grub_dprintf ("zfs", "endian = %d\n", endian);
err = zio_read_data (bp, endian, compbuf, data);
if (err)
{
grub_free (compbuf);
*buf = NULL;
return err;
}
err = zio_checksum_verify (zc, checksum, endian, compbuf, psize);
if (err)
{
grub_dprintf ("zfs", "incorrect checksum\n");
grub_free (compbuf);
*buf = NULL;
return err;
}
if (comp != ZIO_COMPRESS_OFF)
{
*buf = grub_malloc (lsize);
if (!*buf)
{
grub_free (compbuf);
return grub_errno;
}
err = decomp_table[comp].decomp_func (compbuf, *buf, psize, lsize);
grub_free (compbuf);
if (err)
{
grub_free (*buf);
*buf = NULL;
return err;
}
}
return GRUB_ERR_NONE;
}
/*
* Get the block from a block id.
* push the block onto the stack.
*
*/
static grub_err_t
dmu_read (dnode_end_t * dn, grub_uint64_t blkid, void **buf,
grub_zfs_endian_t *endian_out, struct grub_zfs_data *data)
{
int level;
grub_off_t idx;
blkptr_t *bp_array = dn->dn.dn_blkptr;
int epbs = dn->dn.dn_indblkshift - SPA_BLKPTRSHIFT;
blkptr_t *bp;
void *tmpbuf = 0;
grub_zfs_endian_t endian;
grub_err_t err = GRUB_ERR_NONE;
bp = grub_malloc (sizeof (blkptr_t));
if (!bp)
return grub_errno;
endian = dn->endian;
for (level = dn->dn.dn_nlevels - 1; level >= 0; level--)
{
grub_dprintf ("zfs", "endian = %d\n", endian);
idx = (blkid >> (epbs * level)) & ((1 << epbs) - 1);
*bp = bp_array[idx];
if (bp_array != dn->dn.dn_blkptr)
{
grub_free (bp_array);
bp_array = 0;
}
if (BP_IS_HOLE (bp))
{
grub_size_t size = grub_zfs_to_cpu16 (dn->dn.dn_datablkszsec,
dn->endian)
<< SPA_MINBLOCKSHIFT;
*buf = grub_malloc (size);
if (*buf)
{
err = grub_errno;
break;
}
grub_memset (*buf, 0, size);
endian = (grub_zfs_to_cpu64 (bp->blk_prop, endian) >> 63) & 1;
break;
}
if (level == 0)
{
grub_dprintf ("zfs", "endian = %d\n", endian);
err = zio_read (bp, endian, buf, 0, data);
endian = (grub_zfs_to_cpu64 (bp->blk_prop, endian) >> 63) & 1;
break;
}
grub_dprintf ("zfs", "endian = %d\n", endian);
err = zio_read (bp, endian, &tmpbuf, 0, data);
endian = (grub_zfs_to_cpu64 (bp->blk_prop, endian) >> 63) & 1;
if (err)
break;
bp_array = tmpbuf;
}
if (bp_array != dn->dn.dn_blkptr)
grub_free (bp_array);
if (endian_out)
*endian_out = endian;
grub_free (bp);
return err;
}
/*
* mzap_lookup: Looks up property described by "name" and returns the value
* in "value".
*/
static grub_err_t
mzap_lookup (mzap_phys_t * zapobj, grub_zfs_endian_t endian,
int objsize, char *name, grub_uint64_t * value)
{
int i, chunks;
mzap_ent_phys_t *mzap_ent = zapobj->mz_chunk;
chunks = objsize / MZAP_ENT_LEN - 1;
for (i = 0; i < chunks; i++)
{
if (grub_strcmp (mzap_ent[i].mze_name, name) == 0)
{
*value = grub_zfs_to_cpu64 (mzap_ent[i].mze_value, endian);
return GRUB_ERR_NONE;
}
}
return grub_error (GRUB_ERR_FILE_NOT_FOUND, "couldn't find %s", name);
}
static int
mzap_iterate (mzap_phys_t * zapobj, grub_zfs_endian_t endian, int objsize,
int NESTED_FUNC_ATTR (*hook) (const char *name,
grub_uint64_t val))
{
int i, chunks;
mzap_ent_phys_t *mzap_ent = zapobj->mz_chunk;
chunks = objsize / MZAP_ENT_LEN - 1;
for (i = 0; i < chunks; i++)
{
grub_dprintf ("zfs", "zap: name = %s, value = %llx, cd = %x\n",
mzap_ent[i].mze_name, (long long)mzap_ent[i].mze_value,
(int)mzap_ent[i].mze_cd);
if (hook (mzap_ent[i].mze_name,
grub_zfs_to_cpu64 (mzap_ent[i].mze_value, endian)))
return 1;
}
return 0;
}
static grub_uint64_t
zap_hash (grub_uint64_t salt, const char *name)
{
static grub_uint64_t table[256];
const grub_uint8_t *cp;
grub_uint8_t c;
grub_uint64_t crc = salt;
if (table[128] == 0)
{
grub_uint64_t *ct;
int i, j;
for (i = 0; i < 256; i++)
{
for (ct = table + i, *ct = i, j = 8; j > 0; j--)
*ct = (*ct >> 1) ^ (-(*ct & 1) & ZFS_CRC64_POLY);
}
}
for (cp = (const grub_uint8_t *) name; (c = *cp) != '\0'; cp++)
crc = (crc >> 8) ^ table[(crc ^ c) & 0xFF];
/*
* Only use 28 bits, since we need 4 bits in the cookie for the
* collision differentiator. We MUST use the high bits, since
* those are the onces that we first pay attention to when
* chosing the bucket.
*/
crc &= ~((1ULL << (64 - ZAP_HASHBITS)) - 1);
return (crc);
}
/*
* Only to be used on 8-bit arrays.
* array_len is actual len in bytes (not encoded le_value_length).
* buf is null-terminated.
*/
/* XXX */
static int
zap_leaf_array_equal (zap_leaf_phys_t * l, grub_zfs_endian_t endian,
int blksft, int chunk, int array_len, const char *buf)
{
int bseen = 0;
while (bseen < array_len)
{
struct zap_leaf_array *la = &ZAP_LEAF_CHUNK (l, blksft, chunk).l_array;
int toread = MIN (array_len - bseen, ZAP_LEAF_ARRAY_BYTES);
if (chunk >= ZAP_LEAF_NUMCHUNKS (blksft))
return (0);
if (grub_memcmp (la->la_array, buf + bseen, toread) != 0)
break;
chunk = grub_zfs_to_cpu16 (la->la_next, endian);
bseen += toread;
}
return (bseen == array_len);
}
/* XXX */
static grub_err_t
zap_leaf_array_get (zap_leaf_phys_t * l, grub_zfs_endian_t endian, int blksft,
int chunk, int array_len, char *buf)
{
int bseen = 0;
while (bseen < array_len)
{
struct zap_leaf_array *la = &ZAP_LEAF_CHUNK (l, blksft, chunk).l_array;
int toread = MIN (array_len - bseen, ZAP_LEAF_ARRAY_BYTES);
if (chunk >= ZAP_LEAF_NUMCHUNKS (blksft))
/* Don't use grub_error because this error is to be ignored. */
return GRUB_ERR_BAD_FS;
grub_memcpy (buf + bseen,la->la_array, toread);
chunk = grub_zfs_to_cpu16 (la->la_next, endian);
bseen += toread;
}
return GRUB_ERR_NONE;
}
/*
* Given a zap_leaf_phys_t, walk thru the zap leaf chunks to get the
* value for the property "name".
*
*/
/* XXX */
static grub_err_t
zap_leaf_lookup (zap_leaf_phys_t * l, grub_zfs_endian_t endian,
int blksft, grub_uint64_t h,
const char *name, grub_uint64_t * value)
{
grub_uint16_t chunk;
struct zap_leaf_entry *le;
/* Verify if this is a valid leaf block */
if (grub_zfs_to_cpu64 (l->l_hdr.lh_block_type, endian) != ZBT_LEAF)
return grub_error (GRUB_ERR_BAD_FS, "invalid leaf type");
if (grub_zfs_to_cpu32 (l->l_hdr.lh_magic, endian) != ZAP_LEAF_MAGIC)
return grub_error (GRUB_ERR_BAD_FS, "invalid leaf magic");
for (chunk = grub_zfs_to_cpu16 (l->l_hash[LEAF_HASH (blksft, h)], endian);
chunk != CHAIN_END; chunk = le->le_next)
{
if (chunk >= ZAP_LEAF_NUMCHUNKS (blksft))
return grub_error (GRUB_ERR_BAD_FS, "invalid chunk number");
le = ZAP_LEAF_ENTRY (l, blksft, chunk);
/* Verify the chunk entry */
if (le->le_type != ZAP_CHUNK_ENTRY)
return grub_error (GRUB_ERR_BAD_FS, "invalid chunk entry");
if (grub_zfs_to_cpu64 (le->le_hash,endian) != h)
continue;
grub_dprintf ("zfs", "fzap: length %d\n", (int) le->le_name_length);
if (zap_leaf_array_equal (l, endian, blksft,
grub_zfs_to_cpu16 (le->le_name_chunk,endian),
grub_zfs_to_cpu16 (le->le_name_length, endian),
name))
{
struct zap_leaf_array *la;
if (le->le_int_size != 8 || le->le_value_length != 1)
return grub_error (GRUB_ERR_BAD_FS, "invalid leaf chunk entry");
/* get the uint64_t property value */
la = &ZAP_LEAF_CHUNK (l, blksft, le->le_value_chunk).l_array;
*value = grub_be_to_cpu64 (la->la_array64);
return GRUB_ERR_NONE;
}
}
return grub_error (GRUB_ERR_FILE_NOT_FOUND, "couldn't find %s", name);
}
/* Verify if this is a fat zap header block */
static grub_err_t
zap_verify (zap_phys_t *zap)
{
if (zap->zap_magic != (grub_uint64_t) ZAP_MAGIC)
return grub_error (GRUB_ERR_BAD_FS, "bad ZAP magic");
if (zap->zap_flags != 0)
return grub_error (GRUB_ERR_BAD_FS, "bad ZAP flags");
if (zap->zap_salt == 0)
return grub_error (GRUB_ERR_BAD_FS, "bad ZAP salt");
return GRUB_ERR_NONE;
}
/*
* Fat ZAP lookup
*
*/
/* XXX */
static grub_err_t
fzap_lookup (dnode_end_t * zap_dnode, zap_phys_t * zap,
char *name, grub_uint64_t * value, struct grub_zfs_data *data)
{
void *l;
grub_uint64_t hash, idx, blkid;
int blksft = zfs_log2 (grub_zfs_to_cpu16 (zap_dnode->dn.dn_datablkszsec,
zap_dnode->endian) << DNODE_SHIFT);
grub_err_t err;
grub_zfs_endian_t leafendian;
err = zap_verify (zap);
if (err)
return err;
hash = zap_hash (zap->zap_salt, name);
/* get block id from index */
if (zap->zap_ptrtbl.zt_numblks != 0)
return grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET,
"external pointer tables not supported");
idx = ZAP_HASH_IDX (hash, zap->zap_ptrtbl.zt_shift);
blkid = ((grub_uint64_t *) zap)[idx + (1 << (blksft - 3 - 1))];
/* Get the leaf block */
if ((1U << blksft) < sizeof (zap_leaf_phys_t))
return grub_error (GRUB_ERR_BAD_FS, "ZAP leaf is too small");
err = dmu_read (zap_dnode, blkid, &l, &leafendian, data);
if (err)
return err;
err = zap_leaf_lookup (l, leafendian, blksft, hash, name, value);
grub_free (l);
return err;
}
/* XXX */
static int
fzap_iterate (dnode_end_t * zap_dnode, zap_phys_t * zap,
int NESTED_FUNC_ATTR (*hook) (const char *name,
grub_uint64_t val),
struct grub_zfs_data *data)
{
zap_leaf_phys_t *l;
void *l_in;
grub_uint64_t idx, blkid;
grub_uint16_t chunk;
int blksft = zfs_log2 (grub_zfs_to_cpu16 (zap_dnode->dn.dn_datablkszsec,
zap_dnode->endian) << DNODE_SHIFT);
grub_err_t err;
grub_zfs_endian_t endian;
if (zap_verify (zap))
return 0;
/* get block id from index */
if (zap->zap_ptrtbl.zt_numblks != 0)
{
grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET,
"external pointer tables not supported");
return 0;
}
/* Get the leaf block */
if ((1U << blksft) < sizeof (zap_leaf_phys_t))
{
grub_error (GRUB_ERR_BAD_FS, "ZAP leaf is too small");
return 0;
}
for (idx = 0; idx < zap->zap_ptrtbl.zt_numblks; idx++)
{
blkid = ((grub_uint64_t *) zap)[idx + (1 << (blksft - 3 - 1))];
err = dmu_read (zap_dnode, blkid, &l_in, &endian, data);
l = l_in;
if (err)
{
grub_errno = GRUB_ERR_NONE;
continue;
}
/* Verify if this is a valid leaf block */
if (grub_zfs_to_cpu64 (l->l_hdr.lh_block_type, endian) != ZBT_LEAF)
{
grub_free (l);
continue;
}
if (grub_zfs_to_cpu32 (l->l_hdr.lh_magic, endian) != ZAP_LEAF_MAGIC)
{
grub_free (l);
continue;
}
for (chunk = 0; chunk < ZAP_LEAF_NUMCHUNKS (blksft); chunk++)
{
char *buf;
struct zap_leaf_array *la;
struct zap_leaf_entry *le;
grub_uint64_t val;
le = ZAP_LEAF_ENTRY (l, blksft, chunk);
/* Verify the chunk entry */
if (le->le_type != ZAP_CHUNK_ENTRY)
continue;
buf = grub_malloc (grub_zfs_to_cpu16 (le->le_name_length, endian)
+ 1);
if (zap_leaf_array_get (l, endian, blksft, le->le_name_chunk,
le->le_name_length, buf))
{
grub_free (buf);
continue;
}
buf[le->le_name_length] = 0;
if (le->le_int_size != 8
|| grub_zfs_to_cpu16 (le->le_value_length, endian) != 1)
continue;
/* get the uint64_t property value */
la = &ZAP_LEAF_CHUNK (l, blksft, le->le_value_chunk).l_array;
val = grub_be_to_cpu64 (la->la_array64);
if (hook (buf, val))
return 1;
grub_free (buf);
}
}
return 0;
}
/*
* Read in the data of a zap object and find the value for a matching
* property name.
*
*/
static grub_err_t
zap_lookup (dnode_end_t * zap_dnode, char *name, grub_uint64_t * val,
struct grub_zfs_data *data)
{
grub_uint64_t block_type;
int size;
void *zapbuf;
grub_err_t err;
grub_zfs_endian_t endian;
grub_dprintf ("zfs", "looking for '%s'\n", name);
/* Read in the first block of the zap object data. */
size = grub_zfs_to_cpu16 (zap_dnode->dn.dn_datablkszsec,
zap_dnode->endian) << SPA_MINBLOCKSHIFT;
err = dmu_read (zap_dnode, 0, &zapbuf, &endian, data);
if (err)
return err;
block_type = grub_zfs_to_cpu64 (*((grub_uint64_t *) zapbuf), endian);
grub_dprintf ("zfs", "zap read\n");
if (block_type == ZBT_MICRO)
{
grub_dprintf ("zfs", "micro zap\n");
err = (mzap_lookup (zapbuf, endian, size, name, val));
grub_dprintf ("zfs", "returned %d\n", err);
grub_free (zapbuf);
return err;
}
else if (block_type == ZBT_HEADER)
{
grub_dprintf ("zfs", "fat zap\n");
/* this is a fat zap */
err = (fzap_lookup (zap_dnode, zapbuf, name, val, data));
grub_dprintf ("zfs", "returned %d\n", err);
grub_free (zapbuf);
return err;
}
return grub_error (GRUB_ERR_BAD_FS, "unknown ZAP type");
}
static int
zap_iterate (dnode_end_t * zap_dnode,
int NESTED_FUNC_ATTR (*hook) (const char *name, grub_uint64_t val),
struct grub_zfs_data *data)
{
grub_uint64_t block_type;
int size;
void *zapbuf;
grub_err_t err;
int ret;
grub_zfs_endian_t endian;
/* Read in the first block of the zap object data. */
size = grub_zfs_to_cpu16 (zap_dnode->dn.dn_datablkszsec, zap_dnode->endian) << SPA_MINBLOCKSHIFT;
err = dmu_read (zap_dnode, 0, &zapbuf, &endian, data);
if (err)
return 0;
block_type = grub_zfs_to_cpu64 (*((grub_uint64_t *) zapbuf), endian);
grub_dprintf ("zfs", "zap read\n");
if (block_type == ZBT_MICRO)
{
grub_dprintf ("zfs", "micro zap\n");
ret = mzap_iterate (zapbuf, endian, size, hook);
grub_free (zapbuf);
return ret;
}
else if (block_type == ZBT_HEADER)
{
grub_dprintf ("zfs", "fat zap\n");
/* this is a fat zap */
ret = fzap_iterate (zap_dnode, zapbuf, hook, data);
grub_free (zapbuf);
return ret;
}
grub_error (GRUB_ERR_BAD_FS, "unknown ZAP type");
return 0;
}
/*
* Get the dnode of an object number from the metadnode of an object set.
*
* Input
* mdn - metadnode to get the object dnode
* objnum - object number for the object dnode
* buf - data buffer that holds the returning dnode
*/
static grub_err_t
dnode_get (dnode_end_t * mdn, grub_uint64_t objnum, grub_uint8_t type,
dnode_end_t * buf, struct grub_zfs_data *data)
{
grub_uint64_t blkid, blksz; /* the block id this object dnode is in */
int epbs; /* shift of number of dnodes in a block */
int idx; /* index within a block */
void *dnbuf;
grub_err_t err;
grub_zfs_endian_t endian;
blksz = grub_zfs_to_cpu16 (mdn->dn.dn_datablkszsec,
mdn->endian) << SPA_MINBLOCKSHIFT;
epbs = zfs_log2 (blksz) - DNODE_SHIFT;
blkid = objnum >> epbs;
idx = objnum & ((1 << epbs) - 1);
if (data->dnode_buf != NULL && grub_memcmp (data->dnode_mdn, mdn,
sizeof (*mdn)) == 0
&& objnum >= data->dnode_start && objnum < data->dnode_end)
{
grub_memmove (&(buf->dn), &(data->dnode_buf)[idx], DNODE_SIZE);
buf->endian = data->dnode_endian;
if (type && buf->dn.dn_type != type)
return grub_error(GRUB_ERR_BAD_FS, "incorrect dnode type");
return GRUB_ERR_NONE;
}
grub_dprintf ("zfs", "endian = %d, blkid=%llx\n", mdn->endian,
(unsigned long long) blkid);
err = dmu_read (mdn, blkid, &dnbuf, &endian, data);
if (err)
return err;
grub_dprintf ("zfs", "alive\n");
grub_free (data->dnode_buf);
grub_free (data->dnode_mdn);
data->dnode_mdn = grub_malloc (sizeof (*mdn));
if (! data->dnode_mdn)
{
grub_errno = GRUB_ERR_NONE;
data->dnode_buf = 0;
}
else
{
grub_memcpy (data->dnode_mdn, mdn, sizeof (*mdn));
data->dnode_buf = dnbuf;
data->dnode_start = blkid << epbs;
data->dnode_end = (blkid + 1) << epbs;
data->dnode_endian = endian;
}
grub_memmove (&(buf->dn), (dnode_phys_t *) dnbuf + idx, DNODE_SIZE);
buf->endian = endian;
if (type && buf->dn.dn_type != type)
return grub_error(GRUB_ERR_BAD_FS, "incorrect dnode type");
return GRUB_ERR_NONE;
}
/*
* Get the file dnode for a given file name where mdn is the meta dnode
* for this ZFS object set. When found, place the file dnode in dn.
* The 'path' argument will be mangled.
*
*/
static grub_err_t
dnode_get_path (dnode_end_t * mdn, const char *path_in, dnode_end_t * dn,
struct grub_zfs_data *data)
{
grub_uint64_t objnum, version;
char *cname, ch;
grub_err_t err = GRUB_ERR_NONE;
char *path, *path_buf;
struct dnode_chain
{
struct dnode_chain *next;
dnode_end_t dn;
};
struct dnode_chain *dnode_path = 0, *dn_new, *root;
dn_new = grub_malloc (sizeof (*dn_new));
if (! dn_new)
return grub_errno;
dn_new->next = 0;
dnode_path = root = dn_new;
err = dnode_get (mdn, MASTER_NODE_OBJ, DMU_OT_MASTER_NODE,
&(dnode_path->dn), data);
if (err)
{
grub_free (dn_new);
return err;
}
err = zap_lookup (&(dnode_path->dn), ZPL_VERSION_STR, &version, data);
if (err)
{
grub_free (dn_new);
return err;
}
if (version > ZPL_VERSION)
{
grub_free (dn_new);
return grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET, "too new ZPL version");
}
err = zap_lookup (&(dnode_path->dn), ZFS_ROOT_OBJ, &objnum, data);
if (err)
{
grub_free (dn_new);
return err;
}
err = dnode_get (mdn, objnum, 0, &(dnode_path->dn), data);
if (err)
{
grub_free (dn_new);
return err;
}
path = path_buf = grub_strdup (path_in);
if (!path_buf)
{
grub_free (dn_new);
return grub_errno;
}
while (1)
{
/* skip leading slashes */
while (*path == '/')
path++;
if (!*path)
break;
/* get the next component name */
cname = path;
while (*path && *path != '/')
path++;
/* Skip dot. */
if (cname + 1 == path && cname[0] == '.')
continue;
/* Handle double dot. */
if (cname + 2 == path && cname[0] == '.' && cname[1] == '.')
{
if (dn_new->next)
{
dn_new = dnode_path;
dnode_path = dn_new->next;
grub_free (dn_new);
}
else
{
err = grub_error (GRUB_ERR_FILE_NOT_FOUND,
"can't resolve ..");
break;
}
continue;
}
ch = *path;
*path = 0; /* ensure null termination */
if (dnode_path->dn.dn.dn_type != DMU_OT_DIRECTORY_CONTENTS)
{
grub_free (path_buf);
return grub_error (GRUB_ERR_BAD_FILE_TYPE, "not a directory");
}
err = zap_lookup (&(dnode_path->dn), cname, &objnum, data);
if (err)
break;
dn_new = grub_malloc (sizeof (*dn_new));
if (! dn_new)
{
err = grub_errno;
break;
}
dn_new->next = dnode_path;
dnode_path = dn_new;
objnum = ZFS_DIRENT_OBJ (objnum);
err = dnode_get (mdn, objnum, 0, &(dnode_path->dn), data);
if (err)
break;
*path = ch;
#if 0
if (((grub_zfs_to_cpu64(((znode_phys_t *) DN_BONUS (&dnode_path->dn.dn))->zp_mode, dnode_path->dn.endian) >> 12) & 0xf) == 0xa && ch)
{
char *oldpath = path, *oldpathbuf = path_buf;
path = path_buf
= grub_malloc (sizeof (dnode_path->dn.dn.dn_bonus)
- sizeof (znode_phys_t) + grub_strlen (oldpath) + 1);
if (!path_buf)
{
grub_free (oldpathbuf);
return grub_errno;
}
grub_memcpy (path,
(char *) DN_BONUS(&dnode_path->dn.dn) + sizeof (znode_phys_t),
sizeof (dnode_path->dn.dn.dn_bonus) - sizeof (znode_phys_t));
path [sizeof (dnode_path->dn.dn.dn_bonus) - sizeof (znode_phys_t)] = 0;
grub_memcpy (path + grub_strlen (path), oldpath,
grub_strlen (oldpath) + 1);
grub_free (oldpathbuf);
if (path[0] != '/')
{
dn_new = dnode_path;
dnode_path = dn_new->next;
grub_free (dn_new);
}
else while (dnode_path != root)
{
dn_new = dnode_path;
dnode_path = dn_new->next;
grub_free (dn_new);
}
}
#endif
}
if (!err)
grub_memcpy (dn, &(dnode_path->dn), sizeof (*dn));
while (dnode_path)
{
dn_new = dnode_path->next;
grub_free (dnode_path);
dnode_path = dn_new;
}
grub_free (path_buf);
return err;
}
#if 0
/*
* Get the default 'bootfs' property value from the rootpool.
*
*/
static grub_err_t
get_default_bootfsobj (dnode_phys_t * mosmdn, grub_uint64_t * obj,
struct grub_zfs_data *data)
{
grub_uint64_t objnum = 0;
dnode_phys_t *dn;
if (!dn)
return grub_errno;
if ((grub_errno = dnode_get (mosmdn, DMU_POOL_DIRECTORY_OBJECT,
DMU_OT_OBJECT_DIRECTORY, dn, data)))
{
grub_free (dn);
return (grub_errno);
}
/*
* find the object number for 'pool_props', and get the dnode
* of the 'pool_props'.
*/
if (zap_lookup (dn, DMU_POOL_PROPS, &objnum, data))
{
grub_free (dn);
return (GRUB_ERR_BAD_FS);
}
if ((grub_errno = dnode_get (mosmdn, objnum, DMU_OT_POOL_PROPS, dn, data)))
{
grub_free (dn);
return (grub_errno);
}
if (zap_lookup (dn, ZPOOL_PROP_BOOTFS, &objnum, data))
{
grub_free (dn);
return (GRUB_ERR_BAD_FS);
}
if (!objnum)
{
grub_free (dn);
return (GRUB_ERR_BAD_FS);
}
*obj = objnum;
return (0);
}
#endif
/*
* Given a MOS metadnode, get the metadnode of a given filesystem name (fsname),
* e.g. pool/rootfs, or a given object number (obj), e.g. the object number
* of pool/rootfs.
*
* If no fsname and no obj are given, return the DSL_DIR metadnode.
* If fsname is given, return its metadnode and its matching object number.
* If only obj is given, return the metadnode for this object number.
*
*/
static grub_err_t
get_filesystem_dnode (dnode_end_t * mosmdn, char *fsname,
dnode_end_t * mdn, struct grub_zfs_data *data)
{
grub_uint64_t objnum;
grub_err_t err;
grub_dprintf ("zfs", "endian = %d\n", mosmdn->endian);
err = dnode_get (mosmdn, DMU_POOL_DIRECTORY_OBJECT,
DMU_OT_OBJECT_DIRECTORY, mdn, data);
if (err)
return err;
grub_dprintf ("zfs", "alive\n");
err = zap_lookup (mdn, DMU_POOL_ROOT_DATASET, &objnum, data);
if (err)
return err;
grub_dprintf ("zfs", "alive\n");
err = dnode_get (mosmdn, objnum, DMU_OT_DSL_DIR, mdn, data);
if (err)
return err;
grub_dprintf ("zfs", "alive\n");
while (*fsname)
{
grub_uint64_t childobj;
char *cname, ch;
while (*fsname == '/')
fsname++;
if (! *fsname || *fsname == '@')
break;
cname = fsname;
while (*fsname && !grub_isspace (*fsname) && *fsname != '/')
fsname++;
ch = *fsname;
*fsname = 0;
childobj = grub_zfs_to_cpu64 ((((dsl_dir_phys_t *) DN_BONUS (&mdn->dn)))->dd_child_dir_zapobj, mdn->endian);
err = dnode_get (mosmdn, childobj,
DMU_OT_DSL_DIR_CHILD_MAP, mdn, data);
if (err)
return err;
err = zap_lookup (mdn, cname, &objnum, data);
if (err)
return err;
err = dnode_get (mosmdn, objnum, DMU_OT_DSL_DIR, mdn, data);
if (err)
return err;
*fsname = ch;
}
return GRUB_ERR_NONE;
}
static grub_err_t
make_mdn (dnode_end_t * mdn, struct grub_zfs_data *data)
{
void *osp;
blkptr_t *bp;
grub_size_t ospsize;
grub_err_t err;
grub_dprintf ("zfs", "endian = %d\n", mdn->endian);
bp = &(((dsl_dataset_phys_t *) DN_BONUS (&mdn->dn))->ds_bp);
err = zio_read (bp, mdn->endian, &osp, &ospsize, data);
if (err)
return err;
if (ospsize < OBJSET_PHYS_SIZE_V14)
{
grub_free (osp);
return grub_error (GRUB_ERR_BAD_FS, "too small osp");
}
mdn->endian = (grub_zfs_to_cpu64 (bp->blk_prop, mdn->endian)>>63) & 1;
grub_memmove ((char *) &(mdn->dn),
(char *) &((objset_phys_t *) osp)->os_meta_dnode, DNODE_SIZE);
grub_free (osp);
return GRUB_ERR_NONE;
}
static grub_err_t
dnode_get_fullpath (const char *fullpath, dnode_end_t * mdn,
grub_uint64_t *mdnobj, dnode_end_t * dn, int *isfs,
struct grub_zfs_data *data)
{
char *fsname, *snapname;
const char *ptr_at, *filename;
grub_uint64_t headobj;
grub_err_t err;
ptr_at = grub_strchr (fullpath, '@');
if (! ptr_at)
{
*isfs = 1;
filename = 0;
snapname = 0;
fsname = grub_strdup (fullpath);
}
else
{
const char *ptr_slash = grub_strchr (ptr_at, '/');
*isfs = 0;
fsname = grub_malloc (ptr_at - fullpath + 1);
if (!fsname)
return grub_errno;
grub_memcpy (fsname, fullpath, ptr_at - fullpath);
fsname[ptr_at - fullpath] = 0;
if (ptr_at[1] && ptr_at[1] != '/')
{
snapname = grub_malloc (ptr_slash - ptr_at);
if (!snapname)
{
grub_free (fsname);
return grub_errno;
}
grub_memcpy (snapname, ptr_at + 1, ptr_slash - ptr_at - 1);
snapname[ptr_slash - ptr_at - 1] = 0;
}
else
snapname = 0;
if (ptr_slash)
filename = ptr_slash;
else
filename = "/";
grub_dprintf ("zfs", "fsname = '%s' snapname='%s' filename = '%s'\n",
fsname, snapname, filename);
}
grub_dprintf ("zfs", "alive\n");
err = get_filesystem_dnode (&(data->mos), fsname, dn, data);
if (err)
{
grub_free (fsname);
grub_free (snapname);
return err;
}
grub_dprintf ("zfs", "alive\n");
headobj = grub_zfs_to_cpu64 (((dsl_dir_phys_t *) DN_BONUS (&dn->dn))->dd_head_dataset_obj, dn->endian);
grub_dprintf ("zfs", "endian = %d\n", mdn->endian);
err = dnode_get (&(data->mos), headobj, DMU_OT_DSL_DATASET, mdn, data);
if (err)
{
grub_free (fsname);
grub_free (snapname);
return err;
}
grub_dprintf ("zfs", "endian = %d\n", mdn->endian);
if (snapname)
{
grub_uint64_t snapobj;
snapobj = grub_zfs_to_cpu64 (((dsl_dataset_phys_t *) DN_BONUS (&mdn->dn))->ds_snapnames_zapobj, mdn->endian);
err = dnode_get (&(data->mos), snapobj,
DMU_OT_DSL_DS_SNAP_MAP, mdn, data);
if (!err)
err = zap_lookup (mdn, snapname, &headobj, data);
if (!err)
err = dnode_get (&(data->mos), headobj, DMU_OT_DSL_DATASET, mdn, data);
if (err)
{
grub_free (fsname);
grub_free (snapname);
return err;
}
}
if (mdnobj)
*mdnobj = headobj;
make_mdn (mdn, data);
grub_dprintf ("zfs", "endian = %d\n", mdn->endian);
if (*isfs)
{
grub_free (fsname);
grub_free (snapname);
return GRUB_ERR_NONE;
}
err = dnode_get_path (mdn, filename, dn, data);
grub_free (fsname);
grub_free (snapname);
return err;
}
/*
* For a given XDR packed nvlist, verify the first 4 bytes and move on.
*
* An XDR packed nvlist is encoded as (comments from nvs_xdr_create) :
*
* encoding method/host endian (4 bytes)
* nvl_version (4 bytes)
* nvl_nvflag (4 bytes)
* encoded nvpairs:
* encoded size of the nvpair (4 bytes)
* decoded size of the nvpair (4 bytes)
* name string size (4 bytes)
* name string data (sizeof(NV_ALIGN4(string))
* data type (4 bytes)
* # of elements in the nvpair (4 bytes)
* data
* 2 zero's for the last nvpair
* (end of the entire list) (8 bytes)
*
*/
static int
nvlist_find_value (char *nvlist, char *name, int valtype, char **val,
grub_size_t *size_out, grub_size_t *nelm_out)
{
int name_len, type, encode_size;
char *nvpair, *nvp_name;
/* Verify if the 1st and 2nd byte in the nvlist are valid. */
/* NOTE: independently of what endianness header announces all
subsequent values are big-endian. */
if (nvlist[0] != NV_ENCODE_XDR || (nvlist[1] != NV_LITTLE_ENDIAN
&& nvlist[1] != NV_BIG_ENDIAN))
{
grub_dprintf ("zfs", "incorrect nvlist header\n");
grub_error (GRUB_ERR_BAD_FS, "incorrect nvlist");
return 0;
}
/* skip the header, nvl_version, and nvl_nvflag */
nvlist = nvlist + 4 * 3;
/*
* Loop thru the nvpair list
* The XDR representation of an integer is in big-endian byte order.
*/
while ((encode_size = grub_be_to_cpu32 (*(grub_uint32_t *) nvlist)))
{
int nelm;
nvpair = nvlist + 4 * 2; /* skip the encode/decode size */
name_len = grub_be_to_cpu32 (*(grub_uint32_t *) nvpair);
nvpair += 4;
nvp_name = nvpair;
nvpair = nvpair + ((name_len + 3) & ~3); /* align */
type = grub_be_to_cpu32 (*(grub_uint32_t *) nvpair);
nvpair += 4;
nelm = grub_be_to_cpu32 (*(grub_uint32_t *) nvpair);
if (nelm < 1)
return grub_error (GRUB_ERR_BAD_FS, "empty nvpair");
nvpair += 4;
if ((grub_strncmp (nvp_name, name, name_len) == 0) && type == valtype)
{
*val = nvpair;
*size_out = encode_size;
if (nelm_out)
*nelm_out = nelm;
return 1;
}
nvlist += encode_size; /* goto the next nvpair */
}
return 0;
}
int
grub_zfs_nvlist_lookup_uint64 (char *nvlist, char *name, grub_uint64_t * out)
{
char *nvpair;
grub_size_t size;
int found;
found = nvlist_find_value (nvlist, name, DATA_TYPE_UINT64, &nvpair, &size, 0);
if (!found)
return 0;
if (size < sizeof (grub_uint64_t))
{
grub_error (GRUB_ERR_BAD_FS, "invalid uint64");
return 0;
}
*out = grub_be_to_cpu64 (*(grub_uint64_t *) nvpair);
return 1;
}
char *
grub_zfs_nvlist_lookup_string (char *nvlist, char *name)
{
char *nvpair;
char *ret;
grub_size_t slen;
grub_size_t size;
int found;
found = nvlist_find_value (nvlist, name, DATA_TYPE_STRING, &nvpair, &size, 0);
if (!found)
return 0;
if (size < 4)
{
grub_error (GRUB_ERR_BAD_FS, "invalid string");
return 0;
}
slen = grub_be_to_cpu32 (*(grub_uint32_t *) nvpair);
if (slen > size - 4)
slen = size - 4;
ret = grub_malloc (slen + 1);
if (!ret)
return 0;
grub_memcpy (ret, nvpair + 4, slen);
ret[slen] = 0;
return ret;
}
char *
grub_zfs_nvlist_lookup_nvlist (char *nvlist, char *name)
{
char *nvpair;
char *ret;
grub_size_t size;
int found;
found = nvlist_find_value (nvlist, name, DATA_TYPE_NVLIST, &nvpair,
&size, 0);
if (!found)
return 0;
ret = grub_zalloc (size + 3 * sizeof (grub_uint32_t));
if (!ret)
return 0;
grub_memcpy (ret, nvlist, sizeof (grub_uint32_t));
grub_memcpy (ret + sizeof (grub_uint32_t), nvpair, size);
return ret;
}
int
grub_zfs_nvlist_lookup_nvlist_array_get_nelm (char *nvlist, char *name)
{
char *nvpair;
grub_size_t nelm, size;
int found;
found = nvlist_find_value (nvlist, name, DATA_TYPE_NVLIST, &nvpair,
&size, &nelm);
if (! found)
return -1;
return nelm;
}
char *
grub_zfs_nvlist_lookup_nvlist_array (char *nvlist, char *name,
grub_size_t index)
{
char *nvpair, *nvpairptr;
int found;
char *ret;
grub_size_t size;
unsigned i;
grub_size_t nelm;
found = nvlist_find_value (nvlist, name, DATA_TYPE_NVLIST, &nvpair,
&size, &nelm);
if (!found)
return 0;
if (index >= nelm)
{
grub_error (GRUB_ERR_OUT_OF_RANGE, "trying to lookup past nvlist array");
return 0;
}
nvpairptr = nvpair;
for (i = 0; i < index; i++)
{
grub_uint32_t encode_size;
/* skip the header, nvl_version, and nvl_nvflag */
nvpairptr = nvpairptr + 4 * 2;
while (nvpairptr < nvpair + size
&& (encode_size = grub_be_to_cpu32 (*(grub_uint32_t *) nvpairptr)))
nvlist += encode_size; /* goto the next nvpair */
nvlist = nvlist + 4 * 2; /* skip the ending 2 zeros - 8 bytes */
}
if (nvpairptr >= nvpair + size
|| nvpairptr + grub_be_to_cpu32 (*(grub_uint32_t *) (nvpairptr + 4 * 2))
>= nvpair + size)
{
grub_error (GRUB_ERR_BAD_FS, "incorrect nvlist array");
return 0;
}
ret = grub_zalloc (grub_be_to_cpu32 (*(grub_uint32_t *) (nvpairptr + 4 * 2))
+ 3 * sizeof (grub_uint32_t));
if (!ret)
return 0;
grub_memcpy (ret, nvlist, sizeof (grub_uint32_t));
grub_memcpy (ret + sizeof (grub_uint32_t), nvpairptr, size);
return ret;
}
static grub_err_t
zfs_fetch_nvlist (struct grub_zfs_data * data, char **nvlist)
{
grub_err_t err;
*nvlist = grub_malloc (VDEV_PHYS_SIZE);
/* Read in the vdev name-value pair list (112K). */
err = grub_disk_read (data->disk, data->vdev_phys_sector, 0,
VDEV_PHYS_SIZE, *nvlist);
if (err)
{
grub_free (*nvlist);
*nvlist = 0;
return err;
}
return GRUB_ERR_NONE;
}
/*
* Check the disk label information and retrieve needed vdev name-value pairs.
*
*/
static grub_err_t
check_pool_label (struct grub_zfs_data *data)
{
grub_uint64_t pool_state, txg = 0;
char *nvlist;
#if 0
char *nv;
#endif
grub_uint64_t diskguid;
grub_uint64_t version;
int found;
grub_err_t err;
err = zfs_fetch_nvlist (data, &nvlist);
if (err)
return err;
grub_dprintf ("zfs", "check 2 passed\n");
found = grub_zfs_nvlist_lookup_uint64 (nvlist, ZPOOL_CONFIG_POOL_STATE,
&pool_state);
if (! found)
{
grub_free (nvlist);
if (! grub_errno)
grub_error (GRUB_ERR_BAD_FS, ZPOOL_CONFIG_POOL_STATE " not found");
return grub_errno;
}
grub_dprintf ("zfs", "check 3 passed\n");
if (pool_state == POOL_STATE_DESTROYED)
{
grub_free (nvlist);
return grub_error (GRUB_ERR_BAD_FS, "zpool is marked as destroyed");
}
grub_dprintf ("zfs", "check 4 passed\n");
found = grub_zfs_nvlist_lookup_uint64 (nvlist, ZPOOL_CONFIG_POOL_TXG, &txg);
if (!found)
{
grub_free (nvlist);
if (! grub_errno)
grub_error (GRUB_ERR_BAD_FS, ZPOOL_CONFIG_POOL_TXG " not found");
return grub_errno;
}
grub_dprintf ("zfs", "check 6 passed\n");
/* not an active device */
if (txg == 0)
{
grub_free (nvlist);
return grub_error (GRUB_ERR_BAD_FS, "zpool isn't active");
}
grub_dprintf ("zfs", "check 7 passed\n");
found = grub_zfs_nvlist_lookup_uint64 (nvlist, ZPOOL_CONFIG_VERSION,
&version);
if (! found)
{
grub_free (nvlist);
if (! grub_errno)
grub_error (GRUB_ERR_BAD_FS, ZPOOL_CONFIG_VERSION " not found");
return grub_errno;
}
grub_dprintf ("zfs", "check 8 passed\n");
if (version > SPA_VERSION)
{
grub_free (nvlist);
return grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET,
"too new version %llu > %llu",
(unsigned long long) version,
(unsigned long long) SPA_VERSION);
}
grub_dprintf ("zfs", "check 9 passed\n");
#if 0
if (nvlist_lookup_value (nvlist, ZPOOL_CONFIG_VDEV_TREE, &nv,
DATA_TYPE_NVLIST, NULL))
{
grub_free (vdev);
return (GRUB_ERR_BAD_FS);
}
grub_dprintf ("zfs", "check 10 passed\n");
#endif
found = grub_zfs_nvlist_lookup_uint64 (nvlist, ZPOOL_CONFIG_GUID, &diskguid);
if (! found)
{
grub_free (nvlist);
if (! grub_errno)
grub_error (GRUB_ERR_BAD_FS, ZPOOL_CONFIG_GUID " not found");
return grub_errno;
}
grub_dprintf ("zfs", "check 11 passed\n");
grub_free (nvlist);
return GRUB_ERR_NONE;
}
static void
zfs_unmount (struct grub_zfs_data *data)
{
grub_free (data->dnode_buf);
grub_free (data->dnode_mdn);
grub_free (data->file_buf);
grub_free (data);
}
/*
* zfs_mount() locates a valid uberblock of the root pool and read in its MOS
* to the memory address MOS.
*
*/
static struct grub_zfs_data *
zfs_mount (grub_device_t dev)
{
struct grub_zfs_data *data = 0;
int label = 0;
uberblock_phys_t *ub_array, *ubbest = NULL;
vdev_boot_header_t *bh;
void *osp = 0;
grub_size_t ospsize;
grub_err_t err;
int vdevnum;
if (! dev->disk)
{
grub_error (GRUB_ERR_BAD_DEVICE, "not a disk");
return 0;
}
data = grub_malloc (sizeof (*data));
if (!data)
return 0;
grub_memset (data, 0, sizeof (*data));
#if 0
/* if it's our first time here, zero the best uberblock out */
if (data->best_drive == 0 && data->best_part == 0 && find_best_root)
grub_memset (&current_uberblock, 0, sizeof (uberblock_t));
#endif
data->disk = dev->disk;
ub_array = grub_malloc (VDEV_UBERBLOCK_RING);
if (!ub_array)
{
zfs_unmount (data);
return 0;
}
bh = grub_malloc (VDEV_BOOT_HEADER_SIZE);
if (!bh)
{
zfs_unmount (data);
grub_free (ub_array);
return 0;
}
vdevnum = VDEV_LABELS;
/* Don't check back labels on CDROM. */
if (grub_disk_get_size (dev->disk) == GRUB_DISK_SIZE_UNKNOWN)
vdevnum = VDEV_LABELS / 2;
for (label = 0; ubbest == NULL && label < vdevnum; label++)
{
grub_zfs_endian_t ub_endian = UNKNOWN_ENDIAN;
grub_dprintf ("zfs", "label %d\n", label);
data->vdev_phys_sector
= label * (sizeof (vdev_label_t) >> SPA_MINBLOCKSHIFT)
+ ((VDEV_SKIP_SIZE + VDEV_BOOT_HEADER_SIZE) >> SPA_MINBLOCKSHIFT)
+ (label < VDEV_LABELS / 2 ? 0 : grub_disk_get_size (dev->disk)
- VDEV_LABELS * (sizeof (vdev_label_t) >> SPA_MINBLOCKSHIFT));
/* Read in the uberblock ring (128K). */
err = grub_disk_read (data->disk, data->vdev_phys_sector
+ (VDEV_PHYS_SIZE >> SPA_MINBLOCKSHIFT),
0, VDEV_UBERBLOCK_RING, (char *) ub_array);
if (err)
{
grub_errno = GRUB_ERR_NONE;
continue;
}
grub_dprintf ("zfs", "label ok %d\n", label);
ubbest = find_bestub (ub_array, data->vdev_phys_sector);
if (!ubbest)
{
grub_dprintf ("zfs", "No uberblock found\n");
grub_errno = GRUB_ERR_NONE;
continue;
}
ub_endian = (grub_zfs_to_cpu64 (ubbest->ubp_uberblock.ub_magic,
LITTLE_ENDIAN) == UBERBLOCK_MAGIC
? LITTLE_ENDIAN : BIG_ENDIAN);
err = zio_read (&ubbest->ubp_uberblock.ub_rootbp,
ub_endian,
&osp, &ospsize, data);
if (err)
{
grub_dprintf ("zfs", "couldn't zio_read\n");
grub_errno = GRUB_ERR_NONE;
continue;
}
if (ospsize < OBJSET_PHYS_SIZE_V14)
{
grub_dprintf ("zfs", "osp too small\n");
grub_free (osp);
continue;
}
grub_dprintf ("zfs", "ubbest %p\n", ubbest);
err = check_pool_label (data);
if (err)
{
grub_errno = GRUB_ERR_NONE;
continue;
}
#if 0
if (find_best_root &&
vdev_uberblock_compare (&ubbest->ubp_uberblock,
&(current_uberblock)) <= 0)
continue;
#endif
/* Got the MOS. Save it at the memory addr MOS. */
grub_memmove (&(data->mos.dn), &((objset_phys_t *) osp)->os_meta_dnode,
DNODE_SIZE);
data->mos.endian = (grub_zfs_to_cpu64 (ubbest->ubp_uberblock.ub_rootbp.blk_prop, ub_endian) >> 63) & 1;
grub_memmove (&(data->current_uberblock),
&ubbest->ubp_uberblock, sizeof (uberblock_t));
grub_free (ub_array);
grub_free (bh);
grub_free (osp);
return data;
}
grub_error (GRUB_ERR_BAD_FS, "couldn't find a valid label");
zfs_unmount (data);
grub_free (ub_array);
grub_free (bh);
grub_free (osp);
return 0;
}
grub_err_t
grub_zfs_fetch_nvlist (grub_device_t dev, char **nvlist)
{
struct grub_zfs_data *zfs;
grub_err_t err;
zfs = zfs_mount (dev);
if (!zfs)
return grub_errno;
err = zfs_fetch_nvlist (zfs, nvlist);
zfs_unmount (zfs);
return err;
}
static grub_err_t
zfs_label (grub_device_t device, char **label)
{
char *nvlist;
grub_err_t err;
struct grub_zfs_data *data;
data = zfs_mount (device);
if (! data)
return grub_errno;
err = zfs_fetch_nvlist (data, &nvlist);
if (err)
{
zfs_unmount (data);
return err;
}
*label = grub_zfs_nvlist_lookup_string (nvlist, ZPOOL_CONFIG_POOL_NAME);
grub_free (nvlist);
zfs_unmount (data);
return grub_errno;
}
static grub_err_t
zfs_uuid (grub_device_t device, char **uuid)
{
char *nvlist;
int found;
struct grub_zfs_data *data;
grub_uint64_t guid;
grub_err_t err;
*uuid = 0;
data = zfs_mount (device);
if (! data)
return grub_errno;
err = zfs_fetch_nvlist (data, &nvlist);
if (err)
{
zfs_unmount (data);
return err;
}
found = grub_zfs_nvlist_lookup_uint64 (nvlist, ZPOOL_CONFIG_POOL_GUID, &guid);
if (! found)
return grub_errno;
grub_free (nvlist);
*uuid = grub_xasprintf ("%016llx", (long long unsigned) guid);
zfs_unmount (data);
if (! *uuid)
return grub_errno;
return GRUB_ERR_NONE;
}
/*
* zfs_open() locates a file in the rootpool by following the
* MOS and places the dnode of the file in the memory address DNODE.
*/
static grub_err_t
grub_zfs_open (struct grub_file *file, const char *fsfilename)
{
struct grub_zfs_data *data;
grub_err_t err;
int isfs;
data = zfs_mount (file->device);
if (! data)
return grub_errno;
err = dnode_get_fullpath (fsfilename, &(data->mdn), 0,
&(data->dnode), &isfs, data);
if (err)
{
zfs_unmount (data);
return err;
}
if (isfs)
{
zfs_unmount (data);
return grub_error (GRUB_ERR_FILE_NOT_FOUND, "Missing @ or / separator");
}
/* We found the dnode for this file. Verify if it is a plain file. */
if (data->dnode.dn.dn_type != DMU_OT_PLAIN_FILE_CONTENTS)
{
zfs_unmount (data);
return grub_error (GRUB_ERR_BAD_FILE_TYPE, "not a file");
}
/* get the file size and set the file position to 0 */
/*
* For DMU_OT_SA we will need to locate the SIZE attribute
* attribute, which could be either in the bonus buffer
* or the "spill" block.
*/
if (data->dnode.dn.dn_bonustype == DMU_OT_SA)
{
void *sahdrp;
int hdrsize;
if (data->dnode.dn.dn_bonuslen != 0)
{
sahdrp = (sa_hdr_phys_t *) DN_BONUS (&data->dnode.dn);
}
else if (data->dnode.dn.dn_flags & DNODE_FLAG_SPILL_BLKPTR)
{
blkptr_t *bp = &data->dnode.dn.dn_spill;
err = zio_read (bp, data->dnode.endian, &sahdrp, NULL, data);
if (err)
return err;
}
else
{
return grub_error (GRUB_ERR_BAD_FS, "filesystem is corrupt");
}
hdrsize = SA_HDR_SIZE (((sa_hdr_phys_t *) sahdrp));
file->size = *(grub_uint64_t *) ((char *) sahdrp + hdrsize + SA_SIZE_OFFSET);
}
else
{
file->size = grub_zfs_to_cpu64 (((znode_phys_t *) DN_BONUS (&data->dnode.dn))->zp_size, data->dnode.endian);
}
file->data = data;
file->offset = 0;
#ifndef GRUB_UTIL
grub_dl_ref (my_mod);
#endif
return GRUB_ERR_NONE;
}
static grub_ssize_t
grub_zfs_read (grub_file_t file, char *buf, grub_size_t len)
{
struct grub_zfs_data *data = (struct grub_zfs_data *) file->data;
grub_size_t blksz, movesize;
grub_size_t length;
grub_size_t read;
grub_err_t err;
if (data->file_buf == NULL)
{
data->file_buf = grub_malloc (SPA_MAXBLOCKSIZE);
if (!data->file_buf)
return -1;
data->file_start = data->file_end = 0;
}
/*
* If offset is in memory, move it into the buffer provided and return.
*/
if (file->offset >= data->file_start
&& file->offset + len <= data->file_end)
{
grub_memmove (buf, data->file_buf + file->offset - data->file_start,
len);
return len;
}
blksz = grub_zfs_to_cpu16 (data->dnode.dn.dn_datablkszsec,
data->dnode.endian) << SPA_MINBLOCKSHIFT;
/*
* Entire Dnode is too big to fit into the space available. We
* will need to read it in chunks. This could be optimized to
* read in as large a chunk as there is space available, but for
* now, this only reads in one data block at a time.
*/
length = len;
read = 0;
while (length)
{
void *t;
/*
* Find requested blkid and the offset within that block.
*/
grub_uint64_t blkid = grub_divmod64 (file->offset + read, blksz, 0);
grub_free (data->file_buf);
data->file_buf = 0;
err = dmu_read (&(data->dnode), blkid, &t,
0, data);
data->file_buf = t;
if (err)
return -1;
data->file_start = blkid * blksz;
data->file_end = data->file_start + blksz;
movesize = MIN (length, data->file_end - file->offset - read);
grub_memmove (buf, data->file_buf + file->offset + read
- data->file_start, movesize);
buf += movesize;
length -= movesize;
read += movesize;
}
return len;
}
static grub_err_t
grub_zfs_close (grub_file_t file)
{
zfs_unmount ((struct grub_zfs_data *) file->data);
#ifndef GRUB_UTIL
grub_dl_unref (my_mod);
#endif
return GRUB_ERR_NONE;
}
grub_err_t
grub_zfs_getmdnobj (grub_device_t dev, const char *fsfilename,
grub_uint64_t *mdnobj)
{
struct grub_zfs_data *data;
grub_err_t err;
int isfs;
data = zfs_mount (dev);
if (! data)
return grub_errno;
err = dnode_get_fullpath (fsfilename, &(data->mdn), mdnobj,
&(data->dnode), &isfs, data);
zfs_unmount (data);
return err;
}
static void
fill_fs_info (struct grub_dirhook_info *info,
dnode_end_t mdn, struct grub_zfs_data *data)
{
grub_err_t err;
dnode_end_t dn;
grub_uint64_t objnum;
grub_uint64_t headobj;
grub_memset (info, 0, sizeof (*info));
info->dir = 1;
if (mdn.dn.dn_type == DMU_OT_DSL_DIR)
{
headobj = grub_zfs_to_cpu64 (((dsl_dir_phys_t *) DN_BONUS (&mdn.dn))->dd_head_dataset_obj, mdn.endian);
err = dnode_get (&(data->mos), headobj, DMU_OT_DSL_DATASET, &mdn, data);
if (err)
{
grub_dprintf ("zfs", "failed here\n");
return;
}
}
make_mdn (&mdn, data);
err = dnode_get (&mdn, MASTER_NODE_OBJ, DMU_OT_MASTER_NODE,
&dn, data);
if (err)
{
grub_dprintf ("zfs", "failed here\n");
return;
}
err = zap_lookup (&dn, ZFS_ROOT_OBJ, &objnum, data);
if (err)
{
grub_dprintf ("zfs", "failed here\n");
return;
}
err = dnode_get (&mdn, objnum, 0, &dn, data);
if (err)
{
grub_dprintf ("zfs", "failed here\n");
return;
}
info->mtimeset = 1;
info->mtime = grub_zfs_to_cpu64 (((znode_phys_t *) DN_BONUS (&dn.dn))->zp_mtime[0], dn.endian);
return;
}
static grub_err_t
grub_zfs_dir (grub_device_t device, const char *path,
int (*hook) (const char *, const struct grub_dirhook_info *))
{
struct grub_zfs_data *data;
grub_err_t err;
int isfs;
auto int NESTED_FUNC_ATTR iterate_zap (const char *name, grub_uint64_t val);
auto int NESTED_FUNC_ATTR iterate_zap_fs (const char *name,
grub_uint64_t val);
auto int NESTED_FUNC_ATTR iterate_zap_snap (const char *name,
grub_uint64_t val);
int NESTED_FUNC_ATTR iterate_zap (const char *name, grub_uint64_t val)
{
struct grub_dirhook_info info;
dnode_end_t dn;
grub_memset (&info, 0, sizeof (info));
dnode_get (&(data->mdn), val, 0, &dn, data);
info.mtimeset = 1;
info.mtime = grub_zfs_to_cpu64 (((znode_phys_t *) DN_BONUS (&dn.dn))->zp_mtime[0], dn.endian);
info.dir = (dn.dn.dn_type == DMU_OT_DIRECTORY_CONTENTS);
grub_dprintf ("zfs", "type=%d, name=%s\n",
(int)dn.dn.dn_type, (char *)name);
return hook (name, &info);
}
int NESTED_FUNC_ATTR iterate_zap_fs (const char *name, grub_uint64_t val)
{
struct grub_dirhook_info info;
dnode_end_t mdn;
err = dnode_get (&(data->mos), val, 0, &mdn, data);
if (err)
return 0;
if (mdn.dn.dn_type != DMU_OT_DSL_DIR)
return 0;
fill_fs_info (&info, mdn, data);
return hook (name, &info);
}
int NESTED_FUNC_ATTR iterate_zap_snap (const char *name, grub_uint64_t val)
{
struct grub_dirhook_info info;
char *name2;
int ret;
dnode_end_t mdn;
err = dnode_get (&(data->mos), val, 0, &mdn, data);
if (err)
return 0;
if (mdn.dn.dn_type != DMU_OT_DSL_DATASET)
return 0;
fill_fs_info (&info, mdn, data);
name2 = grub_malloc (grub_strlen (name) + 2);
name2[0] = '@';
grub_memcpy (name2 + 1, name, grub_strlen (name) + 1);
ret = hook (name2, &info);
grub_free (name2);
return ret;
}
data = zfs_mount (device);
if (! data)
return grub_errno;
err = dnode_get_fullpath (path, &(data->mdn), 0, &(data->dnode), &isfs, data);
if (err)
{
zfs_unmount (data);
return err;
}
if (isfs)
{
grub_uint64_t childobj, headobj;
grub_uint64_t snapobj;
dnode_end_t dn;
struct grub_dirhook_info info;
fill_fs_info (&info, data->dnode, data);
hook ("@", &info);
childobj = grub_zfs_to_cpu64 (((dsl_dir_phys_t *) DN_BONUS (&data->dnode.dn))->dd_child_dir_zapobj, data->dnode.endian);
headobj = grub_zfs_to_cpu64 (((dsl_dir_phys_t *) DN_BONUS (&data->dnode.dn))->dd_head_dataset_obj, data->dnode.endian);
err = dnode_get (&(data->mos), childobj,
DMU_OT_DSL_DIR_CHILD_MAP, &dn, data);
if (err)
{
zfs_unmount (data);
return err;
}
zap_iterate (&dn, iterate_zap_fs, data);
err = dnode_get (&(data->mos), headobj, DMU_OT_DSL_DATASET, &dn, data);
if (err)
{
zfs_unmount (data);
return err;
}
snapobj = grub_zfs_to_cpu64 (((dsl_dataset_phys_t *) DN_BONUS (&dn.dn))->ds_snapnames_zapobj, dn.endian);
err = dnode_get (&(data->mos), snapobj,
DMU_OT_DSL_DS_SNAP_MAP, &dn, data);
if (err)
{
zfs_unmount (data);
return err;
}
zap_iterate (&dn, iterate_zap_snap, data);
}
else
{
if (data->dnode.dn.dn_type != DMU_OT_DIRECTORY_CONTENTS)
{
zfs_unmount (data);
return grub_error (GRUB_ERR_BAD_FILE_TYPE, "not a directory");
}
zap_iterate (&(data->dnode), iterate_zap, data);
}
zfs_unmount (data);
return grub_errno;
}
static struct grub_fs grub_zfs_fs = {
.name = "zfs",
.dir = grub_zfs_dir,
.open = grub_zfs_open,
.read = grub_zfs_read,
.close = grub_zfs_close,
.label = zfs_label,
.uuid = zfs_uuid,
.mtime = 0,
.next = 0
};
GRUB_MOD_INIT (zfs)
{
grub_fs_register (&grub_zfs_fs);
#ifndef GRUB_UTIL
my_mod = mod;
#endif
}
GRUB_MOD_FINI (zfs)
{
grub_fs_unregister (&grub_zfs_fs);
}
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