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use anopther RAID1(0) copy if main one fails

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This commit is contained in:
Vladimir 'phcoder' Serbinenko 2010-12-06 20:26:49 +01:00
parent 3be8e5ea96
commit 79282228ec
1 changed files with 58 additions and 28 deletions
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86
grub-core/fs/btrfs.c
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@ -491,7 +491,8 @@ lower_bound (struct grub_btrfs_data *data,
}
static grub_device_t
find_device (struct grub_btrfs_data *data, grub_uint64_t id)
find_device (struct grub_btrfs_data *data, grub_uint64_t id,
int do_rescan)
{
grub_device_t dev_found = NULL;
auto int hook (const char *name);
@ -537,7 +538,8 @@ find_device (struct grub_btrfs_data *data, grub_uint64_t id)
for (i = 0; i < data->n_devices_attached; i++)
if (id == data->devices_attached[i].id)
return data->devices_attached[i].dev;
grub_device_iterate (hook);
if (do_rescan)
grub_device_iterate (hook);
if (!dev_found)
{
grub_error (GRUB_ERR_BAD_FS, "couldn't find a member device");
@ -574,7 +576,6 @@ grub_btrfs_read_logical (struct grub_btrfs_data *data,
grub_uint8_t *ptr;
struct grub_btrfs_key *key;
struct grub_btrfs_chunk_item *chunk;
struct grub_btrfs_chunk_stripe *stripe;
grub_ssize_t csize;
grub_err_t err;
struct grub_btrfs_key key_out;
@ -598,7 +599,8 @@ grub_btrfs_read_logical (struct grub_btrfs_data *data,
+ grub_le_to_cpu64 (chunk->size))
goto chunk_found;
ptr += sizeof (*key) + sizeof (*chunk)
+ sizeof (*stripe) * grub_le_to_cpu16 (chunk->nstripes);
+ sizeof (struct grub_btrfs_chunk_stripe)
* grub_le_to_cpu16 (chunk->nstripes);
}
struct grub_btrfs_key key_in;
grub_size_t chsize;
@ -634,9 +636,9 @@ grub_btrfs_read_logical (struct grub_btrfs_data *data,
grub_uint32_t stripen;
grub_uint32_t stripe_offset;
grub_uint64_t off = addr - grub_le_to_cpu64 (key->offset);
grub_disk_addr_t paddr;
unsigned redundancy = 1;
unsigned i, j;
stripe = (struct grub_btrfs_chunk_stripe *) (chunk + 1);
switch (grub_le_to_cpu64 (chunk->type)
& ~GRUB_BTRFS_CHUNK_TYPE_BITS_DONTCARE)
{
@ -661,6 +663,7 @@ grub_btrfs_read_logical (struct grub_btrfs_data *data,
stripen = 0;
stripe_offset = off;
csize = stripe_length - off;
redundancy = 2;
break;
}
case GRUB_BTRFS_CHUNK_TYPE_RAID0:
@ -692,6 +695,8 @@ grub_btrfs_read_logical (struct grub_btrfs_data *data,
&stripen);
stripen *= grub_le_to_cpu16 (chunk->nstripes)
/ grub_le_to_cpu16 (chunk->nsubstripes);
redundancy = grub_le_to_cpu16 (chunk->nstripes)
/ grub_le_to_cpu16 (chunk->nsubstripes);
stripe_offset = low + grub_le_to_cpu64 (chunk->stripe_length)
* high;
csize = grub_le_to_cpu64 (chunk->stripe_length) - low;
@ -702,35 +707,60 @@ grub_btrfs_read_logical (struct grub_btrfs_data *data,
"unsupported RAID flags %" PRIxGRUB_UINT64_T,
grub_le_to_cpu64 (chunk->type));
}
stripe += stripen;
if (csize <= 0)
return grub_error (GRUB_ERR_BAD_FS,
"couldn't find the chunk descriptor");
if ((grub_size_t) csize > size)
csize = size;
dev = find_device (data, stripe->device_id);
if (!dev)
return grub_errno;
grub_dprintf ("btrfs", "chunk 0x%" PRIxGRUB_UINT64_T
"+0x%" PRIxGRUB_UINT64_T " (%d stripes (%d substripes) of %"
PRIxGRUB_UINT64_T ") stripe %" PRIxGRUB_UINT32_T
" maps to 0x%" PRIxGRUB_UINT64_T "\n",
grub_le_to_cpu64 (key->offset),
grub_le_to_cpu64 (chunk->size),
grub_le_to_cpu16 (chunk->nstripes),
grub_le_to_cpu16 (chunk->nsubstripes),
grub_le_to_cpu64 (chunk->stripe_length),
stripen,
stripe->offset);
paddr = stripe->offset + stripe_offset;
grub_dprintf ("btrfs", "reading paddr 0x%" PRIxGRUB_UINT64_T
" for laddr 0x%" PRIxGRUB_UINT64_T"\n", paddr,
addr);
err = grub_disk_read (dev->disk, paddr >> GRUB_DISK_SECTOR_BITS,
paddr & (GRUB_DISK_SECTOR_SIZE - 1), csize, buf);
for (j = 0; j < 2; j++)
{
for (i = 0; i < redundancy; i++)
{
struct grub_btrfs_chunk_stripe *stripe;
grub_disk_addr_t paddr;
stripe = (struct grub_btrfs_chunk_stripe *) (chunk + 1);
/* Right now the redundancy handlind is easy.
With RAID5-like it will be more difficult. */
stripe += stripen + i;
paddr = stripe->offset + stripe_offset;
grub_dprintf ("btrfs", "chunk 0x%" PRIxGRUB_UINT64_T
"+0x%" PRIxGRUB_UINT64_T " (%d stripes (%d substripes) of %"
PRIxGRUB_UINT64_T ") stripe %" PRIxGRUB_UINT32_T
" maps to 0x%" PRIxGRUB_UINT64_T "\n",
grub_le_to_cpu64 (key->offset),
grub_le_to_cpu64 (chunk->size),
grub_le_to_cpu16 (chunk->nstripes),
grub_le_to_cpu16 (chunk->nsubstripes),
grub_le_to_cpu64 (chunk->stripe_length),
stripen, stripe->offset);
grub_dprintf ("btrfs", "reading paddr 0x%" PRIxGRUB_UINT64_T
" for laddr 0x%" PRIxGRUB_UINT64_T"\n", paddr,
addr);
dev = find_device (data, stripe->device_id, j);
if (!dev)
{
err = grub_errno;
grub_errno = GRUB_ERR_NONE;
continue;
}
err = grub_disk_read (dev->disk, paddr >> GRUB_DISK_SECTOR_BITS,
paddr & (GRUB_DISK_SECTOR_SIZE - 1),
csize, buf);
if (!err)
break;
grub_errno = GRUB_ERR_NONE;
}
if (i != redundancy)
break;
}
if (err)
return err;
return grub_errno = err;
}
size -= csize;
buf = (grub_uint8_t *) buf + csize;