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Fix RAIDZ(2).

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* grub-core/fs/zfs/zfs.c (grub_zfs_device_desc): New member ashift.
	(fill_vdev_info_real): Set ashift.
	(read_device): Rewrite RAIDZ part based on reverse engineering.
This commit is contained in:
Vladimir 'phcoder' Serbinenko 2011-11-01 20:05:28 +01:00
parent 7c01e783dc
commit ce8ca56ed9
2 changed files with 64 additions and 14 deletions
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8
ChangeLog
View file

@ -1,3 +1,11 @@
2011-11-01 Vladimir Serbinenko <phcoder@gmail.com>
Fix RAIDZ(2).
* grub-core/fs/zfs/zfs.c (grub_zfs_device_desc): New member ashift.
(fill_vdev_info_real): Set ashift.
(read_device): Rewrite RAIDZ part based on reverse engineering.
2011-10-31 Vladimir Serbinenko <phcoder@gmail.com>
* grub-core/fs/btrfs.c (grub_btrfs_extent_read): Add sanity check and

68
grub-core/fs/zfs/zfs.c
View file

@ -152,6 +152,7 @@ struct grub_zfs_device_desc
/* Valid only for RAIDZ. */
unsigned nparity;
unsigned ashift;
/* Valid only for leaf devices. */
grub_device_t dev;
@ -516,6 +517,9 @@ fill_vdev_info_real (struct grub_zfs_data *data,
if (!grub_zfs_nvlist_lookup_uint64 (nvlist, "nparity", &par))
return grub_error (GRUB_ERR_BAD_FS, "couldn't find raidz parity");
fill->nparity = par;
if (!grub_zfs_nvlist_lookup_uint64 (nvlist, "ashift", &par))
return grub_error (GRUB_ERR_BAD_FS, "couldn't find raidz ashift");
fill->ashift = par;
}
nelm = grub_zfs_nvlist_lookup_nvlist_array_get_nelm (nvlist, ZPOOL_CONFIG_CHILDREN);
@ -882,36 +886,74 @@ read_device (grub_uint64_t offset, struct grub_zfs_device_desc *desc,
}
case DEVICE_RAIDZ:
{
grub_uint64_t sector;
grub_uint32_t bsize;
unsigned c = 0;
grub_uint64_t high;
grub_uint64_t devn;
grub_uint64_t redundancy_strip = 0, m;
grub_uint64_t redundancy_strip2 = 0;
grub_uint32_t s;
bsize = (asize + desc->nparity) / desc->n_children;
sector = offset >> 9;
/* (4,1) -> 2, (3,1) -> 1 */
if (desc->nparity == 1)
s = asize + desc->n_children - 2;
else
s = asize + desc->n_children - 3;
high = grub_divmod64 ((offset >> desc->ashift),
desc->n_children, &m);
if (desc->nparity == 1)
{
redundancy_strip = m;
redundancy_strip += ((offset >> (desc->ashift + 11)) & 1);
if (redundancy_strip == desc->n_children)
redundancy_strip = 0;
redundancy_strip2 = redundancy_strip;
}
else
{
redundancy_strip = m;
redundancy_strip2 = m + 1;
if (redundancy_strip2 == desc->n_children)
redundancy_strip2 = 0;
}
grub_dprintf ("zfs", "rs = %x, %llx\n",
(int) redundancy_strip,
(unsigned long long) high);
while (len > 0)
{
grub_size_t csize;
grub_uint64_t high;
grub_uint64_t devn;
grub_uint32_t bsize;
grub_err_t err;
high = grub_divmod64 (sector + (asize > 2) + c, desc->n_children,
&devn);
csize = bsize << 9;
bsize = s / desc->n_children;
while (1)
{
high = grub_divmod64 ((offset >> desc->ashift) + c,
desc->n_children, &devn);
if (devn != redundancy_strip && devn != redundancy_strip2)
break;
c++;
}
csize = bsize << desc->ashift;
if (csize > len)
csize = len;
grub_dprintf ("zfs", "RAIDZ mapping 0x%" PRIxGRUB_UINT64_T
"+%d+%u -> (0x%" PRIxGRUB_UINT64_T ", 0x%"
"+%u (%d, %d) -> (0x%" PRIxGRUB_UINT64_T ", 0x%"
PRIxGRUB_UINT64_T ")\n",
sector,(asize > 2), c, high, devn);
err = read_device (high << 9, &desc->children[devn],
offset >> desc->ashift, c, asize, bsize, high,
devn);
err = read_device ((high << desc->ashift)
| (offset & ((1 << desc->ashift) - 1)),
&desc->children[devn],
bsize, csize, buf);
if (err)
return err;
c++;
s--;
buf = (char *) buf + csize;
len -= csize;
}
return GRUB_ERR_NONE;
}
return GRUB_ERR_NONE;
}