--- /dev/null
+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.
---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
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
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)
--- /dev/null
+/*
+ * 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");
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;
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)
/* 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 ||
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))
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.
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;
}
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;
{
/* 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;
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;
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;
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);
*---------------------------------------------------------------*/
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,
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;
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,
.status = stripe_status,
.iterate_devices = stripe_iterate_devices,
.io_hints = stripe_io_hints,
+ .merge = stripe_merge,
};
int __init dm_stripe_init(void)
#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 */
*/
#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 */
git.openpandora.org / pandora-kernel.git / commitdiff