*
* This file is released under the GPL.
*/
+#include <linux/async.h>
+#include <linux/ctype.h>
#include <linux/device-mapper.h>
#include <linux/fs.h>
#include <linux/string.h>
+#include <linux/delay.h>
#include "do_mounts.h"
-#include "../drivers/md/dm.h"
+#define DM_MAX_DEVICES 256
+#define DM_MAX_TARGETS 256
#define DM_MAX_NAME 32
#define DM_MAX_UUID 129
#define DM_NO_UUID "none"
#define DM_MSG_PREFIX "init"
/* Separators used for parsing the dm= argument. */
-#define DM_FIELD_SEP ' '
-#define DM_LINE_SEP ','
+#define DM_FIELD_SEP " "
+#define DM_LINE_SEP ","
+#define DM_ANY_SEP DM_FIELD_SEP DM_LINE_SEP
/*
* When the device-mapper and any targets are compiled into the kernel
- * (not a module), one target may be created and used as the root device at
- * boot time with the parameters given with the boot line dm=...
- * The code for that is here.
+ * (not a module), one or more device-mappers may be created and used
+ * as the root device at boot time with the parameters given with the
+ * boot line dm=...
+ *
+ * Multiple device-mappers can be stacked specifing the number of
+ * devices. A device can have multiple targets if the the number of
+ * targets is specified.
+ *
+ * TODO(taysom:defect 32847)
+ * In the future, the <num> field will be mandatory.
+ *
+ * <device> ::= [<num>] <device-mapper>+
+ * <device-mapper> ::= <head> "," <target>+
+ * <head> ::= <name> <uuid> <mode> [<num>]
+ * <target> ::= <start> <length> <type> <options> ","
+ * <mode> ::= "ro" | "rw"
+ * <uuid> ::= xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx | "none"
+ * <type> ::= "verity" | "bootcache" | ...
+ *
+ * Example:
+ * 2 vboot none ro 1,
+ * 0 1768000 bootcache
+ * device=aa55b119-2a47-8c45-946a-5ac57765011f+1
+ * signature=76e9be054b15884a9fa85973e9cb274c93afadb6
+ * cache_start=1768000 max_blocks=100000 size_limit=23 max_trace=20000,
+ * vroot none ro 1,
+ * 0 1740800 verity payload=254:0 hashtree=254:0 hashstart=1740800 alg=sha1
+ * root_hexdigest=76e9be054b15884a9fa85973e9cb274c93afadb6
+ * salt=5b3549d54d6c7a3837b9b81ed72e49463a64c03680c47835bef94d768e5646fe
+ *
+ * Notes:
+ * 1. uuid is a label for the device and we set it to "none".
+ * 2. The <num> field will be optional initially and assumed to be 1.
+ * Once all the scripts that set these fields have been set, it will
+ * be made mandatory.
*/
struct dm_setup_target {
struct dm_setup_target *next;
};
-static struct {
+struct dm_device {
int minor;
int ro;
char name[DM_MAX_NAME];
char uuid[DM_MAX_UUID];
- char *targets;
+ unsigned long num_targets;
struct dm_setup_target *target;
int target_count;
+ struct dm_device *next;
+};
+
+struct dm_option {
+ char *start;
+ char *next;
+ size_t len;
+ char delim;
+};
+
+static struct {
+ unsigned long num_devices;
+ char *str;
} dm_setup_args __initdata;
static __initdata int dm_early_setup;
-static size_t __init get_dm_option(char *str, char **next, char sep)
+static int __init get_dm_option(struct dm_option *opt, const char *accept)
{
- size_t len = 0;
- char *endp = NULL;
+ char *str = opt->next;
+ char *endp;
if (!str)
return 0;
- endp = strchr(str, sep);
+ str = skip_spaces(str);
+ opt->start = str;
+ endp = strpbrk(str, accept);
if (!endp) { /* act like strchrnul */
- len = strlen(str);
- endp = str + len;
+ opt->len = strlen(str);
+ endp = str + opt->len;
} else {
- len = endp - str;
+ opt->len = endp - str;
}
-
- if (endp == str)
- return 0;
-
- if (!next)
- return len;
-
+ opt->delim = *endp;
if (*endp == 0) {
/* Don't advance past the nul. */
- *next = endp;
+ opt->next = endp;
} else {
- *next = endp + 1;
+ opt->next = endp + 1;
}
- return len;
-}
-
-static int __init dm_setup_args_init(void)
-{
- dm_setup_args.minor = 0;
- dm_setup_args.ro = 0;
- dm_setup_args.target = NULL;
- dm_setup_args.target_count = 0;
- return 0;
+ return opt->len != 0;
}
-static int __init dm_setup_cleanup(void)
+static int __init dm_setup_cleanup(struct dm_device *devices)
{
- struct dm_setup_target *target = dm_setup_args.target;
- struct dm_setup_target *old_target = NULL;
- while (target) {
- kfree(target->type);
- kfree(target->params);
- old_target = target;
- target = target->next;
- kfree(old_target);
- dm_setup_args.target_count--;
+ struct dm_device *dev = devices;
+
+ while (dev) {
+ struct dm_device *old_dev = dev;
+ struct dm_setup_target *target = dev->target;
+ while (target) {
+ struct dm_setup_target *old_target = target;
+ kfree(target->type);
+ kfree(target->params);
+ target = target->next;
+ kfree(old_target);
+ dev->target_count--;
+ }
+ BUG_ON(dev->target_count);
+ dev = dev->next;
+ kfree(old_dev);
}
- BUG_ON(dm_setup_args.target_count);
return 0;
}
-static char * __init dm_setup_parse_device_args(char *str)
+static char * __init dm_parse_device(struct dm_device *dev, char *str)
{
- char *next = NULL;
- size_t len = 0;
+ struct dm_option opt;
+ size_t len;
/* Grab the logical name of the device to be exported to udev */
- len = get_dm_option(str, &next, DM_FIELD_SEP);
- if (!len) {
+ opt.next = str;
+ if (!get_dm_option(&opt, DM_FIELD_SEP)) {
DMERR("failed to parse device name");
goto parse_fail;
}
- len = min(len + 1, sizeof(dm_setup_args.name));
- strlcpy(dm_setup_args.name, str, len); /* includes nul */
- str = skip_spaces(next);
+ len = min(opt.len + 1, sizeof(dev->name));
+ strlcpy(dev->name, opt.start, len); /* includes nul */
/* Grab the UUID value or "none" */
- len = get_dm_option(str, &next, DM_FIELD_SEP);
- if (!len) {
+ if (!get_dm_option(&opt, DM_FIELD_SEP)) {
DMERR("failed to parse device uuid");
goto parse_fail;
}
- len = min(len + 1, sizeof(dm_setup_args.uuid));
- strlcpy(dm_setup_args.uuid, str, len);
- str = skip_spaces(next);
+ len = min(opt.len + 1, sizeof(dev->uuid));
+ strlcpy(dev->uuid, opt.start, len);
/* Determine if the table/device will be read only or read-write */
- if (!strncmp("ro,", str, 3)) {
- dm_setup_args.ro = 1;
- } else if (!strncmp("rw,", str, 3)) {
- dm_setup_args.ro = 0;
+ get_dm_option(&opt, DM_ANY_SEP);
+ if (!strncmp("ro", opt.start, opt.len)) {
+ dev->ro = 1;
+ } else if (!strncmp("rw", opt.start, opt.len)) {
+ dev->ro = 0;
} else {
DMERR("failed to parse table mode");
goto parse_fail;
}
- str = skip_spaces(str + 3);
- return str;
+ /* Optional number field */
+ /* XXX: The <num> field will be mandatory in the next round */
+ if (opt.delim == DM_FIELD_SEP[0]) {
+ if (!get_dm_option(&opt, DM_LINE_SEP))
+ return NULL;
+ dev->num_targets = simple_strtoul(opt.start, NULL, 10);
+ } else {
+ dev->num_targets = 1;
+ }
+ if (dev->num_targets > DM_MAX_TARGETS) {
+ DMERR("too many targets %lu > %d",
+ dev->num_targets, DM_MAX_TARGETS);
+ }
+ return opt.next;
parse_fail:
return NULL;
}
-static void __init dm_substitute_devices(char *str, size_t str_len)
+static char * __init dm_parse_targets(struct dm_device *dev, char *str)
{
- char *candidate = str;
- char *candidate_end = str;
- char old_char;
- size_t len = 0;
- dev_t dev;
-
- if (str_len < 3)
- return;
-
- while (str && *str) {
- candidate = strchr(str, '/');
- if (!candidate)
- break;
-
- /* Avoid embedded slashes */
- if (candidate != str && *(candidate - 1) != DM_FIELD_SEP) {
- str = strchr(candidate, DM_FIELD_SEP);
- continue;
- }
-
- len = get_dm_option(candidate, &candidate_end, DM_FIELD_SEP);
- str = skip_spaces(candidate_end);
- if (len < 3 || len > 37) /* name_to_dev_t max; maj:mix min */
- continue;
-
- /* Temporarily terminate with a nul */
- if (*candidate_end)
- candidate_end--;
- old_char = *candidate_end;
- *candidate_end = '\0';
-
- DMDEBUG("converting candidate device '%s' to dev_t", candidate);
- /* Use the boot-time specific device naming */
- dev = name_to_dev_t(candidate);
- *candidate_end = old_char;
-
- DMDEBUG(" -> %u", dev);
- /* No suitable replacement found */
- if (!dev)
- continue;
-
- /* Rewrite the /dev/path as a major:minor */
- len = snprintf(candidate, len, "%u:%u", MAJOR(dev), MINOR(dev));
- if (!len) {
- DMERR("error substituting device major/minor.");
- break;
- }
- candidate += len;
- /* Pad out with spaces (fixing our nul) */
- while (candidate < candidate_end)
- *(candidate++) = DM_FIELD_SEP;
- }
-}
-
-static int __init dm_setup_parse_targets(char *str)
-{
- char *next = NULL;
- size_t len = 0;
- struct dm_setup_target **target = NULL;
+ struct dm_option opt;
+ struct dm_setup_target **target = &dev->target;
+ unsigned long num_targets = dev->num_targets;
+ unsigned long i;
/* Targets are defined as per the table format but with a
* comma as a newline separator. */
- target = &dm_setup_args.target;
- while (str && *str) {
+ opt.next = str;
+ for (i = 0; i < num_targets; i++) {
*target = kzalloc(sizeof(struct dm_setup_target), GFP_KERNEL);
if (!*target) {
- DMERR("failed to allocate memory for target %d",
- dm_setup_args.target_count);
+ DMERR("failed to allocate memory for target %s<%ld>",
+ dev->name, i);
goto parse_fail;
}
- dm_setup_args.target_count++;
+ dev->target_count++;
- (*target)->begin = simple_strtoull(str, &next, 10);
- if (!next || *next != DM_FIELD_SEP) {
- DMERR("failed to parse starting sector for target %d",
- dm_setup_args.target_count - 1);
+ if (!get_dm_option(&opt, DM_FIELD_SEP)) {
+ DMERR("failed to parse starting sector"
+ " for target %s<%ld>", dev->name, i);
goto parse_fail;
}
- str = skip_spaces(next + 1);
+ (*target)->begin = simple_strtoull(opt.start, NULL, 10);
- (*target)->length = simple_strtoull(str, &next, 10);
- if (!next || *next != DM_FIELD_SEP) {
- DMERR("failed to parse length for target %d",
- dm_setup_args.target_count - 1);
+ if (!get_dm_option(&opt, DM_FIELD_SEP)) {
+ DMERR("failed to parse length for target %s<%ld>",
+ dev->name, i);
goto parse_fail;
}
- str = skip_spaces(next + 1);
-
- len = get_dm_option(str, &next, DM_FIELD_SEP);
- if (!len ||
- !((*target)->type = kstrndup(str, len, GFP_KERNEL))) {
- DMERR("failed to parse type for target %d",
- dm_setup_args.target_count - 1);
+ (*target)->length = simple_strtoull(opt.start, NULL, 10);
+
+ if (get_dm_option(&opt, DM_FIELD_SEP))
+ (*target)->type = kstrndup(opt.start, opt.len,
+ GFP_KERNEL);
+ if (!((*target)->type)) {
+ DMERR("failed to parse type for target %s<%ld>",
+ dev->name, i);
goto parse_fail;
}
- str = skip_spaces(next);
-
- len = get_dm_option(str, &next, DM_LINE_SEP);
- if (!len ||
- !((*target)->params = kstrndup(str, len, GFP_KERNEL))) {
- DMERR("failed to parse params for target %d",
- dm_setup_args.target_count - 1);
+ if (get_dm_option(&opt, DM_LINE_SEP))
+ (*target)->params = kstrndup(opt.start, opt.len,
+ GFP_KERNEL);
+ if (!((*target)->params)) {
+ DMERR("failed to parse params for target %s<%ld>",
+ dev->name, i);
goto parse_fail;
}
- str = skip_spaces(next);
-
- /* Before moving on, walk through the copied target and
- * attempt to replace all /dev/xxx with the major:minor number.
- * It may not be possible to resolve them traditionally at
- * boot-time. */
- dm_substitute_devices((*target)->params, len);
-
target = &((*target)->next);
}
- DMDEBUG("parsed %d targets", dm_setup_args.target_count);
+ DMDEBUG("parsed %d targets", dev->target_count);
- return 0;
+ return opt.next;
parse_fail:
- return 1;
+ return NULL;
+}
+
+static struct dm_device * __init dm_parse_args(void)
+{
+ struct dm_device *devices = NULL;
+ struct dm_device **tail = &devices;
+ struct dm_device *dev;
+ char *str = dm_setup_args.str;
+ unsigned long num_devices = dm_setup_args.num_devices;
+ unsigned long i;
+
+ if (!str)
+ return NULL;
+ for (i = 0; i < num_devices; i++) {
+ dev = kzalloc(sizeof(*dev), GFP_KERNEL);
+ if (!dev) {
+ DMERR("failed to allocated memory for dev");
+ goto error;
+ }
+ *tail = dev;
+ tail = &dev->next;
+ /*
+ * devices are given minor numbers 0 - n-1
+ * in the order they are found in the arg
+ * string.
+ */
+ dev->minor = i;
+ str = dm_parse_device(dev, str);
+ if (!str) /* NULL indicates error in parsing, bail */
+ goto error;
+
+ str = dm_parse_targets(dev, str);
+ if (!str)
+ goto error;
+ }
+ return devices;
+error:
+ dm_setup_cleanup(devices);
+ return NULL;
}
/*
* Parse the command-line parameters given our kernel, but do not
* actually try to invoke the DM device now; that is handled by
- * dm_setup_drive after the low-level disk drivers have initialised.
- * dm format is as follows:
- * dm="name uuid fmode,[table line 1],[table line 2],..."
- * May be used with root=/dev/dm-0 as it always uses the first dm minor.
+ * dm_setup_drives after the low-level disk drivers have initialised.
+ * dm format is described at the top of the file.
+ *
+ * Because dm minor numbers are assigned in assending order starting with 0,
+ * You can assume the first device is /dev/dm-0, the next device is /dev/dm-1,
+ * and so forth.
*/
-
static int __init dm_setup(char *str)
{
- dm_setup_args_init();
+ struct dm_option opt;
+ unsigned long num_devices;
- str = dm_setup_parse_device_args(str);
if (!str) {
DMDEBUG("str is NULL");
goto parse_fail;
}
-
- /* Target parsing is delayed until we have dynamic memory */
- dm_setup_args.targets = str;
-
- printk(KERN_INFO "dm: will configure '%s' on dm-%d\n",
- dm_setup_args.name, dm_setup_args.minor);
-
+ opt.next = str;
+ if (!get_dm_option(&opt, DM_FIELD_SEP))
+ goto parse_fail;
+ if (isdigit(opt.start[0])) { /* XXX: Optional number field */
+ num_devices = simple_strtoul(opt.start, NULL, 10);
+ str = opt.next;
+ } else {
+ num_devices = 1;
+ /* Don't advance str */
+ }
+ if (num_devices > DM_MAX_DEVICES) {
+ DMDEBUG("too many devices %lu > %d",
+ num_devices, DM_MAX_DEVICES);
+ }
+ dm_setup_args.str = str;
+ dm_setup_args.num_devices = num_devices;
+ DMINFO("will configure %lu devices", num_devices);
dm_early_setup = 1;
return 1;
parse_fail:
- printk(KERN_WARNING "dm: Invalid arguments supplied to dm=.\n");
+ DMWARN("Invalid arguments supplied to dm=.");
return 0;
}
-
-static void __init dm_setup_drive(void)
+static void __init dm_setup_drives(void)
{
struct mapped_device *md = NULL;
struct dm_table *table = NULL;
struct dm_setup_target *target;
- char *uuid = dm_setup_args.uuid;
+ struct dm_device *dev;
+ char *uuid;
fmode_t fmode = FMODE_READ;
+ struct dm_device *devices;
- /* Finish parsing the targets. */
- if (dm_setup_parse_targets(dm_setup_args.targets))
- goto parse_fail;
-
- if (dm_create(dm_setup_args.minor, &md)) {
- DMDEBUG("failed to create the device");
- goto dm_create_fail;
- }
- DMDEBUG("created device '%s'", dm_device_name(md));
-
- /* In addition to flagging the table below, the disk must be
- * set explicitly ro/rw. */
- set_disk_ro(dm_disk(md), dm_setup_args.ro);
+ devices = dm_parse_args();
- if (!dm_setup_args.ro)
- fmode |= FMODE_WRITE;
- if (dm_table_create(&table, fmode, dm_setup_args.target_count, md)) {
- DMDEBUG("failed to create the table");
- goto dm_table_create_fail;
- }
+ for (dev = devices; dev; dev = dev->next) {
+ if (dm_create(dev->minor, &md)) {
+ DMDEBUG("failed to create the device");
+ goto dm_create_fail;
+ }
+ DMDEBUG("created device '%s'", dm_device_name(md));
+
+ /*
+ * In addition to flagging the table below, the disk must be
+ * set explicitly ro/rw.
+ */
+ set_disk_ro(dm_disk(md), dev->ro);
+
+ if (!dev->ro)
+ fmode |= FMODE_WRITE;
+ if (dm_table_create(&table, fmode, dev->target_count, md)) {
+ DMDEBUG("failed to create the table");
+ goto dm_table_create_fail;
+ }
- dm_lock_md_type(md);
- target = dm_setup_args.target;
- while (target) {
- DMINFO("adding target '%llu %llu %s %s'",
- (unsigned long long) target->begin,
- (unsigned long long) target->length, target->type,
- target->params);
- if (dm_table_add_target(table, target->type, target->begin,
- target->length, target->params)) {
- DMDEBUG("failed to add the target to the table");
- goto add_target_fail;
+ dm_lock_md_type(md);
+
+ for (target = dev->target; target; target = target->next) {
+ DMINFO("adding target '%llu %llu %s %s'",
+ (unsigned long long) target->begin,
+ (unsigned long long) target->length,
+ target->type, target->params);
+ if (dm_table_add_target(table, target->type,
+ target->begin,
+ target->length,
+ target->params)) {
+ DMDEBUG("failed to add the target"
+ " to the table");
+ goto add_target_fail;
+ }
+ }
+ if (dm_table_complete(table)) {
+ DMDEBUG("failed to complete the table");
+ goto table_complete_fail;
}
- target = target->next;
- }
- if (dm_table_complete(table)) {
- DMDEBUG("failed to complete the table");
- goto table_complete_fail;
- }
+ /* Suspend the device so that we can bind it to the table. */
+ if (dm_suspend(md, 0)) {
+ DMDEBUG("failed to suspend the device pre-bind");
+ goto suspend_fail;
+ }
- if (dm_get_md_type(md) == DM_TYPE_NONE) {
+ /* Initial table load: acquire type of table. */
dm_set_md_type(md, dm_table_get_type(table));
+
+ /* Setup md->queue to reflect md's type. */
if (dm_setup_md_queue(md)) {
DMWARN("unable to set up device queue for new table.");
goto setup_md_queue_fail;
}
- } else if (dm_get_md_type(md) != dm_table_get_type(table)) {
- DMWARN("can't change device type after initial table load.");
- goto setup_md_queue_fail;
- }
-
- /* Suspend the device so that we can bind it to the table. */
- if (dm_suspend(md, 0)) {
- DMDEBUG("failed to suspend the device pre-bind");
- goto suspend_fail;
- }
- /* Bind the table to the device. This is the only way to associate
- * md->map with the table and set the disk capacity directly. */
- if (dm_swap_table(md, table)) { /* should return NULL. */
- DMDEBUG("failed to bind the device to the table");
- goto table_bind_fail;
- }
+ /*
+ * Bind the table to the device. This is the only way
+ * to associate md->map with the table and set the disk
+ * capacity directly.
+ */
+ if (dm_swap_table(md, table)) { /* should return NULL. */
+ DMDEBUG("failed to bind the device to the table");
+ goto table_bind_fail;
+ }
- /* Finally, resume and the device should be ready. */
- if (dm_resume(md)) {
- DMDEBUG("failed to resume the device");
- goto resume_fail;
- }
+ /* Finally, resume and the device should be ready. */
+ if (dm_resume(md)) {
+ DMDEBUG("failed to resume the device");
+ goto resume_fail;
+ }
- /* Export the dm device via the ioctl interface */
- if (!strcmp(DM_NO_UUID, dm_setup_args.uuid))
- uuid = NULL;
- if (dm_ioctl_export(md, dm_setup_args.name, uuid)) {
- DMDEBUG("failed to export device with given name and uuid");
- goto export_fail;
- }
- printk(KERN_INFO "dm: dm-%d is ready\n", dm_setup_args.minor);
+ /* Export the dm device via the ioctl interface */
+ if (!strcmp(DM_NO_UUID, dev->uuid))
+ uuid = NULL;
+ if (dm_ioctl_export(md, dev->name, uuid)) {
+ DMDEBUG("failed to export device with given"
+ " name and uuid");
+ goto export_fail;
+ }
- dm_unlock_md_type(md);
- dm_setup_cleanup();
+ dm_unlock_md_type(md);
+
+ DMINFO("dm-%d is ready", dev->minor);
+ }
+ dm_setup_cleanup(devices);
return;
export_fail:
resume_fail:
table_bind_fail:
-suspend_fail:
setup_md_queue_fail:
+suspend_fail:
table_complete_fail:
add_target_fail:
dm_unlock_md_type(md);
dm_table_create_fail:
dm_put(md);
dm_create_fail:
- dm_setup_cleanup();
-parse_fail:
- printk(KERN_WARNING "dm: starting dm-%d (%s) failed\n",
- dm_setup_args.minor, dm_setup_args.name);
+ DMWARN("starting dm-%d (%s) failed",
+ dev->minor, dev->name);
+ dm_setup_cleanup(devices);
}
__setup("dm=", dm_setup);
{
if (!dm_early_setup)
return;
- printk(KERN_INFO "dm: attempting early device configuration.\n");
- dm_setup_drive();
+ DMINFO("attempting early device configuration.");
+ dm_setup_drives();
}
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