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