mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-05 11:36:41 +07:00
1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
235 lines
4.8 KiB
C
235 lines
4.8 KiB
C
/*
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* Copyright (C) 2001-2003 Sistina Software (UK) Limited.
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*
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* This file is released under the GPL.
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*/
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#include "dm.h"
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/blkdev.h>
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#include <linux/bio.h>
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#include <linux/slab.h>
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struct stripe {
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struct dm_dev *dev;
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sector_t physical_start;
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};
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struct stripe_c {
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uint32_t stripes;
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/* The size of this target / num. stripes */
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sector_t stripe_width;
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/* stripe chunk size */
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uint32_t chunk_shift;
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sector_t chunk_mask;
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struct stripe stripe[0];
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};
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static inline struct stripe_c *alloc_context(unsigned int stripes)
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{
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size_t len;
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if (array_too_big(sizeof(struct stripe_c), sizeof(struct stripe),
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stripes))
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return NULL;
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len = sizeof(struct stripe_c) + (sizeof(struct stripe) * stripes);
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return kmalloc(len, GFP_KERNEL);
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}
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/*
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* Parse a single <dev> <sector> pair
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*/
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static int get_stripe(struct dm_target *ti, struct stripe_c *sc,
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unsigned int stripe, char **argv)
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{
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sector_t start;
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if (sscanf(argv[1], SECTOR_FORMAT, &start) != 1)
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return -EINVAL;
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if (dm_get_device(ti, argv[0], start, sc->stripe_width,
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dm_table_get_mode(ti->table),
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&sc->stripe[stripe].dev))
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return -ENXIO;
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sc->stripe[stripe].physical_start = start;
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return 0;
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}
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/*
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* Construct a striped mapping.
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* <number of stripes> <chunk size (2^^n)> [<dev_path> <offset>]+
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*/
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static int stripe_ctr(struct dm_target *ti, unsigned int argc, char **argv)
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{
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struct stripe_c *sc;
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sector_t width;
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uint32_t stripes;
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uint32_t chunk_size;
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char *end;
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int r;
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unsigned int i;
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if (argc < 2) {
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ti->error = "dm-stripe: Not enough arguments";
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return -EINVAL;
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}
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stripes = simple_strtoul(argv[0], &end, 10);
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if (*end) {
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ti->error = "dm-stripe: Invalid stripe count";
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return -EINVAL;
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}
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chunk_size = simple_strtoul(argv[1], &end, 10);
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if (*end) {
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ti->error = "dm-stripe: Invalid chunk_size";
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return -EINVAL;
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}
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/*
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* chunk_size is a power of two
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*/
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if (!chunk_size || (chunk_size & (chunk_size - 1)) ||
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(chunk_size < (PAGE_SIZE >> SECTOR_SHIFT))) {
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ti->error = "dm-stripe: Invalid chunk size";
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return -EINVAL;
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}
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width = ti->len;
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if (sector_div(width, stripes)) {
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ti->error = "dm-stripe: Target length not divisable by "
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"number of stripes";
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return -EINVAL;
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}
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/*
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* Do we have enough arguments for that many stripes ?
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*/
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if (argc != (2 + 2 * stripes)) {
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ti->error = "dm-stripe: Not enough destinations "
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"specified";
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return -EINVAL;
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}
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sc = alloc_context(stripes);
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if (!sc) {
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ti->error = "dm-stripe: Memory allocation for striped context "
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"failed";
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return -ENOMEM;
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}
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sc->stripes = stripes;
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sc->stripe_width = width;
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ti->split_io = chunk_size;
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sc->chunk_mask = ((sector_t) chunk_size) - 1;
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for (sc->chunk_shift = 0; chunk_size; sc->chunk_shift++)
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chunk_size >>= 1;
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sc->chunk_shift--;
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/*
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* Get the stripe destinations.
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*/
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for (i = 0; i < stripes; i++) {
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argv += 2;
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r = get_stripe(ti, sc, i, argv);
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if (r < 0) {
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ti->error = "dm-stripe: Couldn't parse stripe "
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"destination";
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while (i--)
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dm_put_device(ti, sc->stripe[i].dev);
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kfree(sc);
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return r;
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}
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}
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ti->private = sc;
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return 0;
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}
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static void stripe_dtr(struct dm_target *ti)
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{
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unsigned int i;
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struct stripe_c *sc = (struct stripe_c *) ti->private;
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for (i = 0; i < sc->stripes; i++)
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dm_put_device(ti, sc->stripe[i].dev);
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kfree(sc);
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}
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static int stripe_map(struct dm_target *ti, struct bio *bio,
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union map_info *map_context)
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{
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struct stripe_c *sc = (struct stripe_c *) ti->private;
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sector_t offset = bio->bi_sector - ti->begin;
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sector_t chunk = offset >> sc->chunk_shift;
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uint32_t stripe = sector_div(chunk, sc->stripes);
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bio->bi_bdev = sc->stripe[stripe].dev->bdev;
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bio->bi_sector = sc->stripe[stripe].physical_start +
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(chunk << sc->chunk_shift) + (offset & sc->chunk_mask);
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return 1;
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}
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static int stripe_status(struct dm_target *ti,
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status_type_t type, char *result, unsigned int maxlen)
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{
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struct stripe_c *sc = (struct stripe_c *) ti->private;
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unsigned int sz = 0;
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unsigned int i;
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switch (type) {
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case STATUSTYPE_INFO:
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result[0] = '\0';
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break;
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case STATUSTYPE_TABLE:
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DMEMIT("%d " SECTOR_FORMAT, sc->stripes, sc->chunk_mask + 1);
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for (i = 0; i < sc->stripes; i++)
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DMEMIT(" %s " SECTOR_FORMAT, sc->stripe[i].dev->name,
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sc->stripe[i].physical_start);
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break;
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}
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return 0;
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}
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static struct target_type stripe_target = {
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.name = "striped",
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.version= {1, 0, 2},
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.module = THIS_MODULE,
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.ctr = stripe_ctr,
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.dtr = stripe_dtr,
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.map = stripe_map,
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.status = stripe_status,
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};
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int __init dm_stripe_init(void)
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{
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int r;
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r = dm_register_target(&stripe_target);
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if (r < 0)
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DMWARN("striped target registration failed");
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return r;
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}
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void dm_stripe_exit(void)
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{
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if (dm_unregister_target(&stripe_target))
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DMWARN("striped target unregistration failed");
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return;
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}
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