2013-07-08 23:01:29 +00:00
|
|
|
/*
|
|
|
|
* fs/partitions/aix.c
|
|
|
|
*
|
|
|
|
* Copyright (C) 2012-2013 Philippe De Muyter <phdm@macqel.be>
|
|
|
|
*/
|
|
|
|
|
|
|
|
#include "check.h"
|
|
|
|
#include "aix.h"
|
|
|
|
|
|
|
|
struct lvm_rec {
|
|
|
|
char lvm_id[4]; /* "_LVM" */
|
|
|
|
char reserved4[16];
|
|
|
|
__be32 lvmarea_len;
|
|
|
|
__be32 vgda_len;
|
|
|
|
__be32 vgda_psn[2];
|
|
|
|
char reserved36[10];
|
|
|
|
__be16 pp_size; /* log2(pp_size) */
|
|
|
|
char reserved46[12];
|
|
|
|
__be16 version;
|
|
|
|
};
|
|
|
|
|
|
|
|
struct vgda {
|
|
|
|
__be32 secs;
|
|
|
|
__be32 usec;
|
|
|
|
char reserved8[16];
|
|
|
|
__be16 numlvs;
|
|
|
|
__be16 maxlvs;
|
|
|
|
__be16 pp_size;
|
|
|
|
__be16 numpvs;
|
|
|
|
__be16 total_vgdas;
|
|
|
|
__be16 vgda_size;
|
|
|
|
};
|
|
|
|
|
|
|
|
struct lvd {
|
|
|
|
__be16 lv_ix;
|
|
|
|
__be16 res2;
|
|
|
|
__be16 res4;
|
|
|
|
__be16 maxsize;
|
|
|
|
__be16 lv_state;
|
|
|
|
__be16 mirror;
|
|
|
|
__be16 mirror_policy;
|
|
|
|
__be16 num_lps;
|
|
|
|
__be16 res10[8];
|
|
|
|
};
|
|
|
|
|
|
|
|
struct lvname {
|
|
|
|
char name[64];
|
|
|
|
};
|
|
|
|
|
|
|
|
struct ppe {
|
|
|
|
__be16 lv_ix;
|
|
|
|
unsigned short res2;
|
|
|
|
unsigned short res4;
|
|
|
|
__be16 lp_ix;
|
|
|
|
unsigned short res8[12];
|
|
|
|
};
|
|
|
|
|
|
|
|
struct pvd {
|
|
|
|
char reserved0[16];
|
|
|
|
__be16 pp_count;
|
|
|
|
char reserved18[2];
|
|
|
|
__be32 psn_part1;
|
|
|
|
char reserved24[8];
|
|
|
|
struct ppe ppe[1016];
|
|
|
|
};
|
|
|
|
|
|
|
|
#define LVM_MAXLVS 256
|
|
|
|
|
|
|
|
/**
|
|
|
|
* last_lba(): return number of last logical block of device
|
|
|
|
* @bdev: block device
|
|
|
|
*
|
|
|
|
* Description: Returns last LBA value on success, 0 on error.
|
|
|
|
* This is stored (by sd and ide-geometry) in
|
|
|
|
* the part[0] entry for this disk, and is the number of
|
|
|
|
* physical sectors available on the disk.
|
|
|
|
*/
|
|
|
|
static u64 last_lba(struct block_device *bdev)
|
|
|
|
{
|
|
|
|
if (!bdev || !bdev->bd_inode)
|
|
|
|
return 0;
|
|
|
|
return (bdev->bd_inode->i_size >> 9) - 1ULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* read_lba(): Read bytes from disk, starting at given LBA
|
|
|
|
* @state
|
|
|
|
* @lba
|
|
|
|
* @buffer
|
|
|
|
* @count
|
|
|
|
*
|
|
|
|
* Description: Reads @count bytes from @state->bdev into @buffer.
|
|
|
|
* Returns number of bytes read on success, 0 on error.
|
|
|
|
*/
|
|
|
|
static size_t read_lba(struct parsed_partitions *state, u64 lba, u8 *buffer,
|
|
|
|
size_t count)
|
|
|
|
{
|
|
|
|
size_t totalreadcount = 0;
|
|
|
|
|
|
|
|
if (!buffer || lba + count / 512 > last_lba(state->bdev))
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
while (count) {
|
|
|
|
int copied = 512;
|
|
|
|
Sector sect;
|
|
|
|
unsigned char *data = read_part_sector(state, lba++, §);
|
|
|
|
if (!data)
|
|
|
|
break;
|
|
|
|
if (copied > count)
|
|
|
|
copied = count;
|
|
|
|
memcpy(buffer, data, copied);
|
|
|
|
put_dev_sector(sect);
|
|
|
|
buffer += copied;
|
|
|
|
totalreadcount += copied;
|
|
|
|
count -= copied;
|
|
|
|
}
|
|
|
|
return totalreadcount;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* alloc_pvd(): reads physical volume descriptor
|
|
|
|
* @state
|
|
|
|
* @lba
|
|
|
|
*
|
|
|
|
* Description: Returns pvd on success, NULL on error.
|
|
|
|
* Allocates space for pvd and fill it with disk blocks at @lba
|
|
|
|
* Notes: remember to free pvd when you're done!
|
|
|
|
*/
|
|
|
|
static struct pvd *alloc_pvd(struct parsed_partitions *state, u32 lba)
|
|
|
|
{
|
|
|
|
size_t count = sizeof(struct pvd);
|
|
|
|
struct pvd *p;
|
|
|
|
|
|
|
|
p = kmalloc(count, GFP_KERNEL);
|
|
|
|
if (!p)
|
|
|
|
return NULL;
|
|
|
|
|
|
|
|
if (read_lba(state, lba, (u8 *) p, count) < count) {
|
|
|
|
kfree(p);
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
return p;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* alloc_lvn(): reads logical volume names
|
|
|
|
* @state
|
|
|
|
* @lba
|
|
|
|
*
|
|
|
|
* Description: Returns lvn on success, NULL on error.
|
|
|
|
* Allocates space for lvn and fill it with disk blocks at @lba
|
|
|
|
* Notes: remember to free lvn when you're done!
|
|
|
|
*/
|
|
|
|
static struct lvname *alloc_lvn(struct parsed_partitions *state, u32 lba)
|
|
|
|
{
|
|
|
|
size_t count = sizeof(struct lvname) * LVM_MAXLVS;
|
|
|
|
struct lvname *p;
|
|
|
|
|
|
|
|
p = kmalloc(count, GFP_KERNEL);
|
|
|
|
if (!p)
|
|
|
|
return NULL;
|
|
|
|
|
|
|
|
if (read_lba(state, lba, (u8 *) p, count) < count) {
|
|
|
|
kfree(p);
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
return p;
|
|
|
|
}
|
|
|
|
|
|
|
|
int aix_partition(struct parsed_partitions *state)
|
|
|
|
{
|
|
|
|
int ret = 0;
|
|
|
|
Sector sect;
|
|
|
|
unsigned char *d;
|
|
|
|
u32 pp_bytes_size;
|
|
|
|
u32 pp_blocks_size = 0;
|
|
|
|
u32 vgda_sector = 0;
|
|
|
|
u32 vgda_len = 0;
|
|
|
|
int numlvs = 0;
|
|
|
|
struct pvd *pvd;
|
|
|
|
struct lv_info {
|
|
|
|
unsigned short pps_per_lv;
|
|
|
|
unsigned short pps_found;
|
|
|
|
unsigned char lv_is_contiguous;
|
|
|
|
} *lvip;
|
|
|
|
struct lvname *n = NULL;
|
|
|
|
|
|
|
|
d = read_part_sector(state, 7, §);
|
|
|
|
if (d) {
|
|
|
|
struct lvm_rec *p = (struct lvm_rec *)d;
|
|
|
|
u16 lvm_version = be16_to_cpu(p->version);
|
|
|
|
char tmp[64];
|
|
|
|
|
|
|
|
if (lvm_version == 1) {
|
|
|
|
int pp_size_log2 = be16_to_cpu(p->pp_size);
|
|
|
|
|
|
|
|
pp_bytes_size = 1 << pp_size_log2;
|
|
|
|
pp_blocks_size = pp_bytes_size / 512;
|
|
|
|
snprintf(tmp, sizeof(tmp),
|
|
|
|
" AIX LVM header version %u found\n",
|
|
|
|
lvm_version);
|
|
|
|
vgda_len = be32_to_cpu(p->vgda_len);
|
|
|
|
vgda_sector = be32_to_cpu(p->vgda_psn[0]);
|
|
|
|
} else {
|
|
|
|
snprintf(tmp, sizeof(tmp),
|
|
|
|
" unsupported AIX LVM version %d found\n",
|
|
|
|
lvm_version);
|
|
|
|
}
|
|
|
|
strlcat(state->pp_buf, tmp, PAGE_SIZE);
|
|
|
|
put_dev_sector(sect);
|
|
|
|
}
|
|
|
|
if (vgda_sector && (d = read_part_sector(state, vgda_sector, §))) {
|
|
|
|
struct vgda *p = (struct vgda *)d;
|
|
|
|
|
|
|
|
numlvs = be16_to_cpu(p->numlvs);
|
|
|
|
put_dev_sector(sect);
|
|
|
|
}
|
2014-06-12 17:45:17 +00:00
|
|
|
lvip = kcalloc(state->limit, sizeof(struct lv_info), GFP_KERNEL);
|
2013-07-08 23:01:29 +00:00
|
|
|
if (!lvip)
|
|
|
|
return 0;
|
|
|
|
if (numlvs && (d = read_part_sector(state, vgda_sector + 1, §))) {
|
|
|
|
struct lvd *p = (struct lvd *)d;
|
|
|
|
int i;
|
|
|
|
|
|
|
|
n = alloc_lvn(state, vgda_sector + vgda_len - 33);
|
|
|
|
if (n) {
|
|
|
|
int foundlvs = 0;
|
|
|
|
|
|
|
|
for (i = 0; foundlvs < numlvs && i < state->limit; i += 1) {
|
|
|
|
lvip[i].pps_per_lv = be16_to_cpu(p[i].num_lps);
|
|
|
|
if (lvip[i].pps_per_lv)
|
|
|
|
foundlvs += 1;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
put_dev_sector(sect);
|
|
|
|
}
|
|
|
|
pvd = alloc_pvd(state, vgda_sector + 17);
|
|
|
|
if (pvd) {
|
|
|
|
int numpps = be16_to_cpu(pvd->pp_count);
|
|
|
|
int psn_part1 = be32_to_cpu(pvd->psn_part1);
|
|
|
|
int i;
|
|
|
|
int cur_lv_ix = -1;
|
|
|
|
int next_lp_ix = 1;
|
|
|
|
int lp_ix;
|
|
|
|
|
|
|
|
for (i = 0; i < numpps; i += 1) {
|
|
|
|
struct ppe *p = pvd->ppe + i;
|
|
|
|
unsigned int lv_ix;
|
|
|
|
|
|
|
|
lp_ix = be16_to_cpu(p->lp_ix);
|
|
|
|
if (!lp_ix) {
|
|
|
|
next_lp_ix = 1;
|
|
|
|
continue;
|
|
|
|
}
|
|
|
|
lv_ix = be16_to_cpu(p->lv_ix) - 1;
|
2014-08-05 08:09:59 +00:00
|
|
|
if (lv_ix >= state->limit) {
|
2013-07-08 23:01:29 +00:00
|
|
|
cur_lv_ix = -1;
|
|
|
|
continue;
|
|
|
|
}
|
|
|
|
lvip[lv_ix].pps_found += 1;
|
|
|
|
if (lp_ix == 1) {
|
|
|
|
cur_lv_ix = lv_ix;
|
|
|
|
next_lp_ix = 1;
|
|
|
|
} else if (lv_ix != cur_lv_ix || lp_ix != next_lp_ix) {
|
|
|
|
next_lp_ix = 1;
|
|
|
|
continue;
|
|
|
|
}
|
|
|
|
if (lp_ix == lvip[lv_ix].pps_per_lv) {
|
|
|
|
char tmp[70];
|
|
|
|
|
|
|
|
put_partition(state, lv_ix + 1,
|
|
|
|
(i + 1 - lp_ix) * pp_blocks_size + psn_part1,
|
|
|
|
lvip[lv_ix].pps_per_lv * pp_blocks_size);
|
|
|
|
snprintf(tmp, sizeof(tmp), " <%s>\n",
|
|
|
|
n[lv_ix].name);
|
|
|
|
strlcat(state->pp_buf, tmp, PAGE_SIZE);
|
|
|
|
lvip[lv_ix].lv_is_contiguous = 1;
|
|
|
|
ret = 1;
|
|
|
|
next_lp_ix = 1;
|
|
|
|
} else
|
|
|
|
next_lp_ix += 1;
|
|
|
|
}
|
|
|
|
for (i = 0; i < state->limit; i += 1)
|
|
|
|
if (lvip[i].pps_found && !lvip[i].lv_is_contiguous)
|
|
|
|
pr_warn("partition %s (%u pp's found) is "
|
|
|
|
"not contiguous\n",
|
|
|
|
n[i].name, lvip[i].pps_found);
|
|
|
|
kfree(pvd);
|
|
|
|
}
|
|
|
|
kfree(n);
|
|
|
|
kfree(lvip);
|
|
|
|
return ret;
|
|
|
|
}
|