Release 4.7 drivers/md/dm-snap-transient.c
/*
* Copyright (C) 2001-2002 Sistina Software (UK) Limited.
* Copyright (C) 2006-2008 Red Hat GmbH
*
* This file is released under the GPL.
*/
#include "dm-exception-store.h"
#include <linux/mm.h>
#include <linux/pagemap.h>
#include <linux/vmalloc.h>
#include <linux/export.h>
#include <linux/slab.h>
#include <linux/dm-io.h>
#define DM_MSG_PREFIX "transient snapshot"
/*-----------------------------------------------------------------
* Implementation of the store for non-persistent snapshots.
*---------------------------------------------------------------*/
struct transient_c {
sector_t next_free;
};
static void transient_dtr(struct dm_exception_store *store)
{
kfree(store->context);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| alasdair kergon | alasdair kergon | 17 | 94.44% | 1 | 50.00% |
| jonathan brassow | jonathan brassow | 1 | 5.56% | 1 | 50.00% |
| Total | 18 | 100.00% | 2 | 100.00% |
static int transient_read_metadata(struct dm_exception_store *store,
int (*callback)(void *callback_context,
chunk_t old, chunk_t new),
void *callback_context)
{
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| jonathan brassow | jonathan brassow | 21 | 60.00% | 1 | 50.00% |
| alasdair kergon | alasdair kergon | 14 | 40.00% | 1 | 50.00% |
| Total | 35 | 100.00% | 2 | 100.00% |
static int transient_prepare_exception(struct dm_exception_store *store,
struct dm_exception *e)
{
struct transient_c *tc = store->context;
sector_t size = get_dev_size(dm_snap_cow(store->snap)->bdev);
if (size < (tc->next_free + store->chunk_size))
return -1;
e->new_chunk = sector_to_chunk(store, tc->next_free);
tc->next_free += store->chunk_size;
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| alasdair kergon | alasdair kergon | 76 | 92.68% | 1 | 25.00% |
| mike snitzer | mike snitzer | 4 | 4.88% | 1 | 25.00% |
| jonathan brassow | jonathan brassow | 2 | 2.44% | 2 | 50.00% |
| Total | 82 | 100.00% | 4 | 100.00% |
static void transient_commit_exception(struct dm_exception_store *store,
struct dm_exception *e, int valid,
void (*callback) (void *, int success),
void *callback_context)
{
/* Just succeed */
callback(callback_context, valid);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| alasdair kergon | alasdair kergon | 38 | 86.36% | 1 | 25.00% |
| mikulas patocka | mikulas patocka | 4 | 9.09% | 1 | 25.00% |
| jonathan brassow | jonathan brassow | 2 | 4.55% | 2 | 50.00% |
| Total | 44 | 100.00% | 4 | 100.00% |
static void transient_usage(struct dm_exception_store *store,
sector_t *total_sectors,
sector_t *sectors_allocated,
sector_t *metadata_sectors)
{
*sectors_allocated = ((struct transient_c *) store->context)->next_free;
*total_sectors = get_dev_size(dm_snap_cow(store->snap)->bdev);
*metadata_sectors = 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| alasdair kergon | alasdair kergon | 41 | 69.49% | 1 | 33.33% |
| mike snitzer | mike snitzer | 18 | 30.51% | 2 | 66.67% |
| Total | 59 | 100.00% | 3 | 100.00% |
static int transient_ctr(struct dm_exception_store *store, char *options)
{
struct transient_c *tc;
tc = kmalloc(sizeof(struct transient_c), GFP_KERNEL);
if (!tc)
return -ENOMEM;
tc->next_free = 0;
store->context = tc;
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| alasdair kergon | alasdair kergon | 51 | 89.47% | 1 | 33.33% |
| jonathan brassow | jonathan brassow | 5 | 8.77% | 1 | 33.33% |
| mike snitzer | mike snitzer | 1 | 1.75% | 1 | 33.33% |
| Total | 57 | 100.00% | 3 | 100.00% |
static unsigned transient_status(struct dm_exception_store *store,
status_type_t status, char *result,
unsigned maxlen)
{
unsigned sz = 0;
switch (status) {
case STATUSTYPE_INFO:
break;
case STATUSTYPE_TABLE:
DMEMIT(" N %llu", (unsigned long long)store->chunk_size);
}
return sz;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| jonathan brassow | jonathan brassow | 55 | 98.21% | 2 | 66.67% |
| mike snitzer | mike snitzer | 1 | 1.79% | 1 | 33.33% |
| Total | 56 | 100.00% | 3 | 100.00% |
static struct dm_exception_store_type _transient_type = {
.name = "transient",
.module = THIS_MODULE,
.ctr = transient_ctr,
.dtr = transient_dtr,
.read_metadata = transient_read_metadata,
.prepare_exception = transient_prepare_exception,
.commit_exception = transient_commit_exception,
.usage = transient_usage,
.status = transient_status,
};
static struct dm_exception_store_type _transient_compat_type = {
.name = "N",
.module = THIS_MODULE,
.ctr = transient_ctr,
.dtr = transient_dtr,
.read_metadata = transient_read_metadata,
.prepare_exception = transient_prepare_exception,
.commit_exception = transient_commit_exception,
.usage = transient_usage,
.status = transient_status,
};
int dm_transient_snapshot_init(void)
{
int r;
r = dm_exception_store_type_register(&_transient_type);
if (r) {
DMWARN("Unable to register transient exception store type");
return r;
}
r = dm_exception_store_type_register(&_transient_compat_type);
if (r) {
DMWARN("Unable to register old-style transient "
"exception store type");
dm_exception_store_type_unregister(&_transient_type);
return r;
}
return r;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| jonathan brassow | jonathan brassow | 55 | 85.94% | 1 | 50.00% |
| alasdair kergon | alasdair kergon | 9 | 14.06% | 1 | 50.00% |
| Total | 64 | 100.00% | 2 | 100.00% |
void dm_transient_snapshot_exit(void)
{
dm_exception_store_type_unregister(&_transient_type);
dm_exception_store_type_unregister(&_transient_compat_type);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| jonathan brassow | jonathan brassow | 14 | 73.68% | 1 | 50.00% |
| alasdair kergon | alasdair kergon | 5 | 26.32% | 1 | 50.00% |
| Total | 19 | 100.00% | 2 | 100.00% |
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| alasdair kergon | alasdair kergon | 283 | 49.39% | 1 | 10.00% |
| jonathan brassow | jonathan brassow | 255 | 44.50% | 4 | 40.00% |
| mike snitzer | mike snitzer | 28 | 4.89% | 3 | 30.00% |
| mikulas patocka | mikulas patocka | 4 | 0.70% | 1 | 10.00% |
| paul gortmaker | paul gortmaker | 3 | 0.52% | 1 | 10.00% |
| Total | 573 | 100.00% | 10 | 100.00% |
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