提交 44bbd7ac 编写于 作者: L Linus Torvalds

Merge git://git.kernel.org/pub/scm/linux/kernel/git/agk/linux-2.6-dm

* git://git.kernel.org/pub/scm/linux/kernel/git/agk/linux-2.6-dm:
  dm stripe: implement merge method
  dm mpath: allow table load with no priority groups
  dm mpath: fail message ioctl if specified path is not valid
  dm ioctl: add flag to wipe buffers for secure data
  dm ioctl: prepare for crypt key wiping
  dm crypt: wipe keys string immediately after key is set
  dm: add flakey target
  dm: fix opening log and cow devices for read only tables
dm-flakey
=========
This target is the same as the linear target except that it returns I/O
errors periodically. It's been found useful in simulating failing
devices for testing purposes.
Starting from the time the table is loaded, the device is available for
<up interval> seconds, then returns errors for <down interval> seconds,
and then this cycle repeats.
Parameters: <dev path> <offset> <up interval> <down interval>
<dev path>: Full pathname to the underlying block-device, or a
"major:minor" device-number.
<offset>: Starting sector within the device.
<up interval>: Number of seconds device is available.
<down interval>: Number of seconds device returns errors.
......@@ -327,4 +327,10 @@ config DM_UEVENT
---help---
Generate udev events for DM events.
config DM_FLAKEY
tristate "Flakey target (EXPERIMENTAL)"
depends on BLK_DEV_DM && EXPERIMENTAL
---help---
A target that intermittently fails I/O for debugging purposes.
endif # MD
......@@ -29,6 +29,7 @@ obj-$(CONFIG_BLK_DEV_MD) += md-mod.o
obj-$(CONFIG_BLK_DEV_DM) += dm-mod.o
obj-$(CONFIG_DM_CRYPT) += dm-crypt.o
obj-$(CONFIG_DM_DELAY) += dm-delay.o
obj-$(CONFIG_DM_FLAKEY) += dm-flakey.o
obj-$(CONFIG_DM_MULTIPATH) += dm-multipath.o dm-round-robin.o
obj-$(CONFIG_DM_MULTIPATH_QL) += dm-queue-length.o
obj-$(CONFIG_DM_MULTIPATH_ST) += dm-service-time.o
......
......@@ -1324,20 +1324,29 @@ static int crypt_setkey_allcpus(struct crypt_config *cc)
static int crypt_set_key(struct crypt_config *cc, char *key)
{
int r = -EINVAL;
int key_string_len = strlen(key);
/* The key size may not be changed. */
if (cc->key_size != (strlen(key) >> 1))
return -EINVAL;
if (cc->key_size != (key_string_len >> 1))
goto out;
/* Hyphen (which gives a key_size of zero) means there is no key. */
if (!cc->key_size && strcmp(key, "-"))
return -EINVAL;
goto out;
if (cc->key_size && crypt_decode_key(cc->key, key, cc->key_size) < 0)
return -EINVAL;
goto out;
set_bit(DM_CRYPT_KEY_VALID, &cc->flags);
return crypt_setkey_allcpus(cc);
r = crypt_setkey_allcpus(cc);
out:
/* Hex key string not needed after here, so wipe it. */
memset(key, '0', key_string_len);
return r;
}
static int crypt_wipe_key(struct crypt_config *cc)
......
/*
* Copyright (C) 2003 Sistina Software (UK) Limited.
* Copyright (C) 2004, 2010 Red Hat, Inc. All rights reserved.
*
* This file is released under the GPL.
*/
#include <linux/device-mapper.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/blkdev.h>
#include <linux/bio.h>
#include <linux/slab.h>
#define DM_MSG_PREFIX "flakey"
/*
* Flakey: Used for testing only, simulates intermittent,
* catastrophic device failure.
*/
struct flakey_c {
struct dm_dev *dev;
unsigned long start_time;
sector_t start;
unsigned up_interval;
unsigned down_interval;
};
/*
* Construct a flakey mapping: <dev_path> <offset> <up interval> <down interval>
*/
static int flakey_ctr(struct dm_target *ti, unsigned int argc, char **argv)
{
struct flakey_c *fc;
unsigned long long tmp;
if (argc != 4) {
ti->error = "dm-flakey: Invalid argument count";
return -EINVAL;
}
fc = kmalloc(sizeof(*fc), GFP_KERNEL);
if (!fc) {
ti->error = "dm-flakey: Cannot allocate linear context";
return -ENOMEM;
}
fc->start_time = jiffies;
if (sscanf(argv[1], "%llu", &tmp) != 1) {
ti->error = "dm-flakey: Invalid device sector";
goto bad;
}
fc->start = tmp;
if (sscanf(argv[2], "%u", &fc->up_interval) != 1) {
ti->error = "dm-flakey: Invalid up interval";
goto bad;
}
if (sscanf(argv[3], "%u", &fc->down_interval) != 1) {
ti->error = "dm-flakey: Invalid down interval";
goto bad;
}
if (!(fc->up_interval + fc->down_interval)) {
ti->error = "dm-flakey: Total (up + down) interval is zero";
goto bad;
}
if (fc->up_interval + fc->down_interval < fc->up_interval) {
ti->error = "dm-flakey: Interval overflow";
goto bad;
}
if (dm_get_device(ti, argv[0], dm_table_get_mode(ti->table), &fc->dev)) {
ti->error = "dm-flakey: Device lookup failed";
goto bad;
}
ti->num_flush_requests = 1;
ti->private = fc;
return 0;
bad:
kfree(fc);
return -EINVAL;
}
static void flakey_dtr(struct dm_target *ti)
{
struct flakey_c *fc = ti->private;
dm_put_device(ti, fc->dev);
kfree(fc);
}
static sector_t flakey_map_sector(struct dm_target *ti, sector_t bi_sector)
{
struct flakey_c *fc = ti->private;
return fc->start + (bi_sector - ti->begin);
}
static void flakey_map_bio(struct dm_target *ti, struct bio *bio)
{
struct flakey_c *fc = ti->private;
bio->bi_bdev = fc->dev->bdev;
if (bio_sectors(bio))
bio->bi_sector = flakey_map_sector(ti, bio->bi_sector);
}
static int flakey_map(struct dm_target *ti, struct bio *bio,
union map_info *map_context)
{
struct flakey_c *fc = ti->private;
unsigned elapsed;
/* Are we alive ? */
elapsed = (jiffies - fc->start_time) / HZ;
if (elapsed % (fc->up_interval + fc->down_interval) >= fc->up_interval)
return -EIO;
flakey_map_bio(ti, bio);
return DM_MAPIO_REMAPPED;
}
static int flakey_status(struct dm_target *ti, status_type_t type,
char *result, unsigned int maxlen)
{
struct flakey_c *fc = ti->private;
switch (type) {
case STATUSTYPE_INFO:
result[0] = '\0';
break;
case STATUSTYPE_TABLE:
snprintf(result, maxlen, "%s %llu %u %u", fc->dev->name,
(unsigned long long)fc->start, fc->up_interval,
fc->down_interval);
break;
}
return 0;
}
static int flakey_ioctl(struct dm_target *ti, unsigned int cmd, unsigned long arg)
{
struct flakey_c *fc = ti->private;
return __blkdev_driver_ioctl(fc->dev->bdev, fc->dev->mode, cmd, arg);
}
static int flakey_merge(struct dm_target *ti, struct bvec_merge_data *bvm,
struct bio_vec *biovec, int max_size)
{
struct flakey_c *fc = ti->private;
struct request_queue *q = bdev_get_queue(fc->dev->bdev);
if (!q->merge_bvec_fn)
return max_size;
bvm->bi_bdev = fc->dev->bdev;
bvm->bi_sector = flakey_map_sector(ti, bvm->bi_sector);
return min(max_size, q->merge_bvec_fn(q, bvm, biovec));
}
static int flakey_iterate_devices(struct dm_target *ti, iterate_devices_callout_fn fn, void *data)
{
struct flakey_c *fc = ti->private;
return fn(ti, fc->dev, fc->start, ti->len, data);
}
static struct target_type flakey_target = {
.name = "flakey",
.version = {1, 1, 0},
.module = THIS_MODULE,
.ctr = flakey_ctr,
.dtr = flakey_dtr,
.map = flakey_map,
.status = flakey_status,
.ioctl = flakey_ioctl,
.merge = flakey_merge,
.iterate_devices = flakey_iterate_devices,
};
static int __init dm_flakey_init(void)
{
int r = dm_register_target(&flakey_target);
if (r < 0)
DMERR("register failed %d", r);
return r;
}
static void __exit dm_flakey_exit(void)
{
dm_unregister_target(&flakey_target);
}
/* Module hooks */
module_init(dm_flakey_init);
module_exit(dm_flakey_exit);
MODULE_DESCRIPTION(DM_NAME " flakey target");
MODULE_AUTHOR("Joe Thornber <dm-devel@redhat.com>");
MODULE_LICENSE("GPL");
......@@ -1501,14 +1501,10 @@ static int check_version(unsigned int cmd, struct dm_ioctl __user *user)
return r;
}
static void free_params(struct dm_ioctl *param)
{
vfree(param);
}
static int copy_params(struct dm_ioctl __user *user, struct dm_ioctl **param)
{
struct dm_ioctl tmp, *dmi;
int secure_data;
if (copy_from_user(&tmp, user, sizeof(tmp) - sizeof(tmp.data)))
return -EFAULT;
......@@ -1516,17 +1512,30 @@ static int copy_params(struct dm_ioctl __user *user, struct dm_ioctl **param)
if (tmp.data_size < (sizeof(tmp) - sizeof(tmp.data)))
return -EINVAL;
secure_data = tmp.flags & DM_SECURE_DATA_FLAG;
dmi = vmalloc(tmp.data_size);
if (!dmi)
if (!dmi) {
if (secure_data && clear_user(user, tmp.data_size))
return -EFAULT;
return -ENOMEM;
if (copy_from_user(dmi, user, tmp.data_size)) {
vfree(dmi);
return -EFAULT;
}
if (copy_from_user(dmi, user, tmp.data_size))
goto bad;
/* Wipe the user buffer so we do not return it to userspace */
if (secure_data && clear_user(user, tmp.data_size))
goto bad;
*param = dmi;
return 0;
bad:
if (secure_data)
memset(dmi, 0, tmp.data_size);
vfree(dmi);
return -EFAULT;
}
static int validate_params(uint cmd, struct dm_ioctl *param)
......@@ -1534,6 +1543,7 @@ static int validate_params(uint cmd, struct dm_ioctl *param)
/* Always clear this flag */
param->flags &= ~DM_BUFFER_FULL_FLAG;
param->flags &= ~DM_UEVENT_GENERATED_FLAG;
param->flags &= ~DM_SECURE_DATA_FLAG;
/* Ignores parameters */
if (cmd == DM_REMOVE_ALL_CMD ||
......@@ -1561,10 +1571,11 @@ static int validate_params(uint cmd, struct dm_ioctl *param)
static int ctl_ioctl(uint command, struct dm_ioctl __user *user)
{
int r = 0;
int wipe_buffer;
unsigned int cmd;
struct dm_ioctl *uninitialized_var(param);
ioctl_fn fn = NULL;
size_t param_size;
size_t input_param_size;
/* only root can play with this */
if (!capable(CAP_SYS_ADMIN))
......@@ -1611,13 +1622,15 @@ static int ctl_ioctl(uint command, struct dm_ioctl __user *user)
if (r)
return r;
input_param_size = param->data_size;
wipe_buffer = param->flags & DM_SECURE_DATA_FLAG;
r = validate_params(cmd, param);
if (r)
goto out;
param_size = param->data_size;
param->data_size = sizeof(*param);
r = fn(param, param_size);
r = fn(param, input_param_size);
/*
* Copy the results back to userland.
......@@ -1625,8 +1638,11 @@ static int ctl_ioctl(uint command, struct dm_ioctl __user *user)
if (!r && copy_to_user(user, param, param->data_size))
r = -EFAULT;
out:
free_params(param);
out:
if (wipe_buffer)
memset(param, 0, input_param_size);
vfree(param);
return r;
}
......
......@@ -543,7 +543,7 @@ static int disk_ctr(struct dm_dirty_log *log, struct dm_target *ti,
return -EINVAL;
}
r = dm_get_device(ti, argv[0], FMODE_READ | FMODE_WRITE, &dev);
r = dm_get_device(ti, argv[0], dm_table_get_mode(ti->table), &dev);
if (r)
return r;
......
......@@ -844,8 +844,8 @@ static int multipath_ctr(struct dm_target *ti, unsigned int argc,
{
/* target parameters */
static struct param _params[] = {
{1, 1024, "invalid number of priority groups"},
{1, 1024, "invalid initial priority group number"},
{0, 1024, "invalid number of priority groups"},
{0, 1024, "invalid initial priority group number"},
};
int r;
......@@ -879,6 +879,13 @@ static int multipath_ctr(struct dm_target *ti, unsigned int argc,
if (r)
goto bad;
if ((!m->nr_priority_groups && next_pg_num) ||
(m->nr_priority_groups && !next_pg_num)) {
ti->error = "invalid initial priority group";
r = -EINVAL;
goto bad;
}
/* parse the priority groups */
while (as.argc) {
struct priority_group *pg;
......@@ -1065,7 +1072,7 @@ static int reinstate_path(struct pgpath *pgpath)
static int action_dev(struct multipath *m, struct dm_dev *dev,
action_fn action)
{
int r = 0;
int r = -EINVAL;
struct pgpath *pgpath;
struct priority_group *pg;
......@@ -1415,7 +1422,7 @@ static int multipath_status(struct dm_target *ti, status_type_t type,
else if (m->current_pg)
pg_num = m->current_pg->pg_num;
else
pg_num = 1;
pg_num = (m->nr_priority_groups ? 1 : 0);
DMEMIT("%u ", pg_num);
......@@ -1669,7 +1676,7 @@ static int multipath_busy(struct dm_target *ti)
*---------------------------------------------------------------*/
static struct target_type multipath_target = {
.name = "multipath",
.version = {1, 2, 0},
.version = {1, 3, 0},
.module = THIS_MODULE,
.ctr = multipath_ctr,
.dtr = multipath_dtr,
......
......@@ -1080,7 +1080,7 @@ static int snapshot_ctr(struct dm_target *ti, unsigned int argc, char **argv)
argv++;
argc--;
r = dm_get_device(ti, cow_path, FMODE_READ | FMODE_WRITE, &s->cow);
r = dm_get_device(ti, cow_path, dm_table_get_mode(ti->table), &s->cow);
if (r) {
ti->error = "Cannot get COW device";
goto bad_cow;
......
......@@ -396,9 +396,29 @@ static void stripe_io_hints(struct dm_target *ti,
blk_limits_io_opt(limits, chunk_size * sc->stripes);
}
static int stripe_merge(struct dm_target *ti, struct bvec_merge_data *bvm,
struct bio_vec *biovec, int max_size)
{
struct stripe_c *sc = ti->private;
sector_t bvm_sector = bvm->bi_sector;
uint32_t stripe;
struct request_queue *q;
stripe_map_sector(sc, bvm_sector, &stripe, &bvm_sector);
q = bdev_get_queue(sc->stripe[stripe].dev->bdev);
if (!q->merge_bvec_fn)
return max_size;
bvm->bi_bdev = sc->stripe[stripe].dev->bdev;
bvm->bi_sector = sc->stripe[stripe].physical_start + bvm_sector;
return min(max_size, q->merge_bvec_fn(q, bvm, biovec));
}
static struct target_type stripe_target = {
.name = "striped",
.version = {1, 3, 1},
.version = {1, 4, 0},
.module = THIS_MODULE,
.ctr = stripe_ctr,
.dtr = stripe_dtr,
......@@ -407,6 +427,7 @@ static struct target_type stripe_target = {
.status = stripe_status,
.iterate_devices = stripe_iterate_devices,
.io_hints = stripe_io_hints,
.merge = stripe_merge,
};
int __init dm_stripe_init(void)
......
......@@ -267,9 +267,9 @@ enum {
#define DM_DEV_SET_GEOMETRY _IOWR(DM_IOCTL, DM_DEV_SET_GEOMETRY_CMD, struct dm_ioctl)
#define DM_VERSION_MAJOR 4
#define DM_VERSION_MINOR 19
#define DM_VERSION_PATCHLEVEL 1
#define DM_VERSION_EXTRA "-ioctl (2011-01-07)"
#define DM_VERSION_MINOR 20
#define DM_VERSION_PATCHLEVEL 0
#define DM_VERSION_EXTRA "-ioctl (2011-02-02)"
/* Status bits */
#define DM_READONLY_FLAG (1 << 0) /* In/Out */
......@@ -328,4 +328,10 @@ enum {
*/
#define DM_UUID_FLAG (1 << 14) /* In */
/*
* If set, all buffers are wiped after use. Use when sending
* or requesting sensitive data such as an encryption key.
*/
#define DM_SECURE_DATA_FLAG (1 << 15) /* In */
#endif /* _LINUX_DM_IOCTL_H */
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