static int
dm_target_linear_dump(dm_table_entry_t *table_en, void *data, size_t length, off_t offset)
{
dm_target_linear_config_t *tlc;
tlc = table_en->target_config;
offset += tlc->offset * DEV_BSIZE;
offset = dm_pdev_correct_dump_offset(tlc->pdev, offset);
if (tlc->pdev->pdev_vnode->v_rdev == NULL)
return ENXIO;
return dev_ddump(tlc->pdev->pdev_vnode->v_rdev, data, 0, offset, length);
}
static int
dm_target_stripe_dump(dm_table_entry_t *table_en, void *data, size_t length, off_t offset)
{
dm_target_stripe_config_t *tsc;
uint64_t blkno, blkoff;
uint64_t stripe, blknr;
uint32_t stripe_off, stripe_rest, num_blks, issue_blks;
uint64_t off2, len2;
int devnr;
tsc = table_en->target_config;
if (tsc == NULL)
return 0;
/* calculate extent of request */
KKASSERT(length % DEV_BSIZE == 0);
blkno = offset / DEV_BSIZE;
blkoff = 0;
num_blks = length / DEV_BSIZE;
/*
* 0 length means flush buffers and return
*/
if (length == 0) {
for (devnr = 0; devnr < tsc->stripe_num; ++devnr) {
if (tsc->stripe_devs[devnr].pdev->pdev_vnode->v_rdev == NULL)
return ENXIO;
dev_ddump(tsc->stripe_devs[devnr].pdev->pdev_vnode->v_rdev,
data, 0, offset, 0);
}
return 0;
}
while (num_blks > 0) {
/* blockno to strip piece nr */
stripe = blkno / tsc->stripe_chunksize;
stripe_off = blkno % tsc->stripe_chunksize;
/* where we are inside the strip */
devnr = stripe % tsc->stripe_num;
blknr = stripe / tsc->stripe_num;
/* how much is left before we hit a boundary */
stripe_rest = tsc->stripe_chunksize - stripe_off;
/* issue this piece on stripe `stripe' */
issue_blks = MIN(stripe_rest, num_blks);
#if 0
nestiobuf_add(bio, nestbuf, blkoff,
issue_blks * DEV_BSIZE);
#endif
len2 = issue_blks * DEV_BSIZE;
/* I need number of bytes. */
off2 = blknr * tsc->stripe_chunksize + stripe_off;
off2 += tsc->stripe_devs[devnr].offset;
off2 *= DEV_BSIZE;
off2 = dm_pdev_correct_dump_offset(tsc->stripe_devs[devnr].pdev,
off2);
if (tsc->stripe_devs[devnr].pdev->pdev_vnode->v_rdev == NULL)
return ENXIO;
dev_ddump(tsc->stripe_devs[devnr].pdev->pdev_vnode->v_rdev,
(char *)data + blkoff, 0, off2, len2);
blkno += issue_blks;
blkoff += issue_blks * DEV_BSIZE;
num_blks -= issue_blks;
}
return 0;
}
