diff options
Diffstat (limited to 'extras/multipath/libdevmapper/ioctl/libdevmapper.c')
| -rw-r--r-- | extras/multipath/libdevmapper/ioctl/libdevmapper.c | 1092 |
1 files changed, 1092 insertions, 0 deletions
diff --git a/extras/multipath/libdevmapper/ioctl/libdevmapper.c b/extras/multipath/libdevmapper/ioctl/libdevmapper.c new file mode 100644 index 0000000000..ac7ba0c86a --- /dev/null +++ b/extras/multipath/libdevmapper/ioctl/libdevmapper.c @@ -0,0 +1,1092 @@ +/* + * Copyright (C) 2001 Sistina Software (UK) Limited. + * + * This file is released under the LGPL. + */ + +#include "libdm-targets.h" +#include "libdm-common.h" + +#ifdef DM_COMPAT +# include "libdm-compat.h" +#endif + +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> +#include <fcntl.h> +#include <dirent.h> +#include <errno.h> +#include <sys/stat.h> +#include <sys/ioctl.h> +#include <limits.h> + +#ifdef linux +# include <linux/limits.h> +# include <linux/kdev_t.h> +# include <linux/dm-ioctl.h> +#else +# define MAJOR(x) major((x)) +# define MINOR(x) minor((x)) +# define MKDEV(x,y) makedev((x),(y)) +#endif + +/* + * Ensure build compatibility. + * The hard-coded versions here are the highest present + * in the _cmd_data arrays. + */ + +#if !((DM_VERSION_MAJOR == 1 && DM_VERSION_MINOR >= 0) || \ + (DM_VERSION_MAJOR == 4 && DM_VERSION_MINOR >= 0)) +#error The version of dm-ioctl.h included is incompatible. +#endif + +/* dm major version no for running kernel */ +static int _dm_version = DM_VERSION_MAJOR; +static int _log_suppress = 0; + +static int _control_fd = -1; +static int _version_checked = 0; +static int _version_ok = 1; + +/* + * Support both old and new major numbers to ease the transition. + * Clumsy, but only temporary. + */ +#if DM_VERSION_MAJOR == 4 && defined(DM_COMPAT) +const int _dm_compat = 1; +#else +const int _dm_compat = 0; +#endif + + +/* *INDENT-OFF* */ +static struct cmd_data _cmd_data_v4[] = { + {"create", DM_DEV_CREATE, {4, 0, 0}}, + {"reload", DM_TABLE_LOAD, {4, 0, 0}}, + {"remove", DM_DEV_REMOVE, {4, 0, 0}}, + {"remove_all", DM_REMOVE_ALL, {4, 0, 0}}, + {"suspend", DM_DEV_SUSPEND, {4, 0, 0}}, + {"resume", DM_DEV_SUSPEND, {4, 0, 0}}, + {"info", DM_DEV_STATUS, {4, 0, 0}}, + {"deps", DM_TABLE_DEPS, {4, 0, 0}}, + {"rename", DM_DEV_RENAME, {4, 0, 0}}, + {"version", DM_VERSION, {4, 0, 0}}, + {"status", DM_TABLE_STATUS, {4, 0, 0}}, + {"table", DM_TABLE_STATUS, {4, 0, 0}}, + {"waitevent", DM_DEV_WAIT, {4, 0, 0}}, + {"names", DM_LIST_DEVICES, {4, 0, 0}}, + {"clear", DM_TABLE_CLEAR, {4, 0, 0}}, + {"mknodes", DM_DEV_STATUS, {4, 0, 0}}, +}; +/* *INDENT-ON* */ + +#define ALIGNMENT_V1 sizeof(int) +#define ALIGNMENT 8 + +/* FIXME Rejig library to record & use errno instead */ +#ifndef DM_EXISTS_FLAG +# define DM_EXISTS_FLAG 0x00000004 +#endif + +static void *_align(void *ptr, unsigned int a) +{ + register unsigned long agn = --a; + + return (void *) (((unsigned long) ptr + agn) & ~agn); +} + +static int _open_control(void) +{ + char control[PATH_MAX]; + + if (_control_fd != -1) + return 1; + + snprintf(control, sizeof(control), "%s/control", dm_dir()); + + if ((_control_fd = open(control, O_RDWR)) < 0) { + log_error("%s: open failed: %s", control, strerror(errno)); + log_error("Is device-mapper driver missing from kernel?"); + return 0; + } + + return 1; +} + +void dm_task_destroy(struct dm_task *dmt) +{ + struct target *t, *n; + + for (t = dmt->head; t; t = n) { + n = t->next; + free(t->params); + free(t->type); + free(t); + } + + if (dmt->dev_name) + free(dmt->dev_name); + + if (dmt->newname) + free(dmt->newname); + + if (dmt->dmi.v4) + free(dmt->dmi.v4); + + if (dmt->uuid) + free(dmt->uuid); + + free(dmt); +} + +/* + * Protocol Version 1 compatibility functions. + */ + +#ifdef DM_COMPAT + +static int _dm_task_get_driver_version_v1(struct dm_task *dmt, char *version, + size_t size) +{ + unsigned int *v; + + if (!dmt->dmi.v1) { + version[0] = '\0'; + return 0; + } + + v = dmt->dmi.v1->version; + snprintf(version, size, "%u.%u.%u", v[0], v[1], v[2]); + return 1; +} + +/* Unmarshall the target info returned from a status call */ +static int _unmarshal_status_v1(struct dm_task *dmt, struct dm_ioctl_v1 *dmi) +{ + char *outbuf = (char *) dmi + dmi->data_start; + char *outptr = outbuf; + int32_t i; + struct dm_target_spec_v1 *spec; + + for (i = 0; i < dmi->target_count; i++) { + spec = (struct dm_target_spec_v1 *) outptr; + + if (!dm_task_add_target(dmt, spec->sector_start, + (uint64_t) spec->length, + spec->target_type, + outptr + sizeof(*spec))) + return 0; + + outptr = outbuf + spec->next; + } + + return 1; +} + +static int _dm_format_dev_v1(char *buf, int bufsize, uint32_t dev_major, + uint32_t dev_minor) +{ + int r; + + if (bufsize < 8) + return 0; + + r = snprintf(buf, bufsize, "%03x:%03x", dev_major, dev_minor); + if (r < 0 || r > bufsize - 1) + return 0; + + return 1; +} + +static int _dm_task_get_info_v1(struct dm_task *dmt, struct dm_info *info) +{ + if (!dmt->dmi.v1) + return 0; + + memset(info, 0, sizeof(*info)); + + info->exists = dmt->dmi.v1->flags & DM_EXISTS_FLAG ? 1 : 0; + if (!info->exists) + return 1; + + info->suspended = dmt->dmi.v1->flags & DM_SUSPEND_FLAG ? 1 : 0; + info->read_only = dmt->dmi.v1->flags & DM_READONLY_FLAG ? 1 : 0; + info->target_count = dmt->dmi.v1->target_count; + info->open_count = dmt->dmi.v1->open_count; + info->event_nr = 0; + info->major = MAJOR(dmt->dmi.v1->dev); + info->minor = MINOR(dmt->dmi.v1->dev); + info->live_table = 1; + info->inactive_table = 0; + + return 1; +} + +static const char *_dm_task_get_name_v1(struct dm_task *dmt) +{ + return (dmt->dmi.v1->name); +} + +static const char *_dm_task_get_uuid_v1(struct dm_task *dmt) +{ + return (dmt->dmi.v1->uuid); +} + +static struct dm_deps *_dm_task_get_deps_v1(struct dm_task *dmt) +{ + log_error("deps version 1 no longer supported by libdevmapper"); + return NULL; +} + +static struct dm_names *_dm_task_get_names_v1(struct dm_task *dmt) +{ + return (struct dm_names *) (((void *) dmt->dmi.v1) + + dmt->dmi.v1->data_start); +} + +static void *_add_target_v1(struct target *t, void *out, void *end) +{ + void *out_sp = out; + struct dm_target_spec_v1 sp; + size_t sp_size = sizeof(struct dm_target_spec_v1); + int len; + const char no_space[] = "Ran out of memory building ioctl parameter"; + + out += sp_size; + if (out >= end) { + log_error(no_space); + return NULL; + } + + sp.status = 0; + sp.sector_start = t->start; + sp.length = t->length; + strncpy(sp.target_type, t->type, sizeof(sp.target_type)); + + len = strlen(t->params); + + if ((out + len + 1) >= end) { + log_error(no_space); + + log_error("t->params= '%s'", t->params); + return NULL; + } + strcpy((char *) out, t->params); + out += len + 1; + + /* align next block */ + out = _align(out, ALIGNMENT_V1); + + sp.next = out - out_sp; + + memcpy(out_sp, &sp, sp_size); + + return out; +} + +static struct dm_ioctl_v1 *_flatten_v1(struct dm_task *dmt) +{ + const size_t min_size = 16 * 1024; + const int (*version)[3]; + + struct dm_ioctl_v1 *dmi; + struct target *t; + size_t len = sizeof(struct dm_ioctl_v1); + void *b, *e; + int count = 0; + + for (t = dmt->head; t; t = t->next) { + len += sizeof(struct dm_target_spec_v1); + len += strlen(t->params) + 1 + ALIGNMENT_V1; + count++; + } + + if (count && dmt->newname) { + log_error("targets and newname are incompatible"); + return NULL; + } + + if (dmt->newname) + len += strlen(dmt->newname) + 1; + + /* + * Give len a minimum size so that we have space to store + * dependencies or status information. + */ + if (len < min_size) + len = min_size; + + if (!(dmi = malloc(len))) + return NULL; + + memset(dmi, 0, len); + + version = &_cmd_data_v1[dmt->type].version; + + dmi->version[0] = (*version)[0]; + dmi->version[1] = (*version)[1]; + dmi->version[2] = (*version)[2]; + + dmi->data_size = len; + dmi->data_start = sizeof(struct dm_ioctl_v1); + + if (dmt->dev_name) + strncpy(dmi->name, dmt->dev_name, sizeof(dmi->name)); + + if (dmt->type == DM_DEVICE_SUSPEND) + dmi->flags |= DM_SUSPEND_FLAG; + if (dmt->read_only) + dmi->flags |= DM_READONLY_FLAG; + + if (dmt->minor >= 0) { + if (dmt->major <= 0) { + log_error("Missing major number for persistent device"); + return NULL; + } + dmi->flags |= DM_PERSISTENT_DEV_FLAG; + dmi->dev = MKDEV(dmt->major, dmt->minor); + } + + if (dmt->uuid) + strncpy(dmi->uuid, dmt->uuid, sizeof(dmi->uuid)); + + dmi->target_count = count; + + b = (void *) (dmi + 1); + e = (void *) ((char *) dmi + len); + + for (t = dmt->head; t; t = t->next) + if (!(b = _add_target_v1(t, b, e))) + goto bad; + + if (dmt->newname) + strcpy(b, dmt->newname); + + return dmi; + + bad: + free(dmi); + return NULL; +} + +static int _dm_names_v1(struct dm_ioctl_v1 *dmi) +{ + const char *dev_dir = dm_dir(); + int r = 1, len; + const char *name; + struct dirent *dirent; + DIR *d; + struct dm_names *names, *old_names = NULL; + void *end = (void *) dmi + dmi->data_size; + struct stat buf; + char path[PATH_MAX]; + + if (!(d = opendir(dev_dir))) { + log_error("%s: opendir failed: %s", dev_dir, strerror(errno)); + return 0; + } + + names = (struct dm_names *) ((void *) dmi + dmi->data_start); + + names->dev = 0; /* Flags no data */ + + while ((dirent = readdir(d))) { + name = dirent->d_name; + + if (name[0] == '.' || !strcmp(name, "control")) + continue; + + if (old_names) + old_names->next = (uint32_t) ((void *) names - + (void *) old_names); + snprintf(path, sizeof(path), "%s/%s", dev_dir, name); + if (stat(path, &buf)) { + log_error("%s: stat failed: %s", path, strerror(errno)); + continue; + } + if (!S_ISBLK(buf.st_mode)) + continue; + names->dev = (uint64_t) buf.st_rdev; + names->next = 0; + len = strlen(name); + if (((void *) (names + 1) + len + 1) >= end) { + log_error("Insufficient buffer space for device list"); + r = 0; + break; + } + + strcpy(names->name, name); + + old_names = names; + names = _align((void *) ++names + len + 1, ALIGNMENT); + } + + if (closedir(d)) + log_error("%s: closedir failed: %s", dev_dir, strerror(errno)); + + return r; +} + +static int _dm_task_run_v1(struct dm_task *dmt) +{ + struct dm_ioctl_v1 *dmi; + unsigned int command; + + dmi = _flatten_v1(dmt); + if (!dmi) { + log_error("Couldn't create ioctl argument"); + return 0; + } + + if (!_open_control()) + return 0; + + if ((unsigned) dmt->type >= + (sizeof(_cmd_data_v1) / sizeof(*_cmd_data_v1))) { + log_error("Internal error: unknown device-mapper task %d", + dmt->type); + goto bad; + } + + command = _cmd_data_v1[dmt->type].cmd; + + if (dmt->type == DM_DEVICE_TABLE) + dmi->flags |= DM_STATUS_TABLE_FLAG; + + log_debug("dm %s %s %s %s", _cmd_data_v1[dmt->type].name, dmi->name, + dmi->uuid, dmt->newname ? dmt->newname : ""); + if (dmt->type == DM_DEVICE_LIST) { + if (!_dm_names_v1(dmi)) + goto bad; + } else if (ioctl(_control_fd, command, dmi) < 0) { + if (_log_suppress) + log_verbose("device-mapper ioctl cmd %d failed: %s", + _IOC_NR(command), strerror(errno)); + else + log_error("device-mapper ioctl cmd %d failed: %s", + _IOC_NR(command), strerror(errno)); + goto bad; + } + + switch (dmt->type) { + case DM_DEVICE_CREATE: + add_dev_node(dmt->dev_name, MAJOR(dmi->dev), MINOR(dmi->dev)); + break; + + case DM_DEVICE_REMOVE: + rm_dev_node(dmt->dev_name); + break; + + case DM_DEVICE_RENAME: + rename_dev_node(dmt->dev_name, dmt->newname); + break; + + case DM_DEVICE_MKNODES: + if (dmi->flags & DM_EXISTS_FLAG) + add_dev_node(dmt->dev_name, MAJOR(dmi->dev), + MINOR(dmi->dev)); + else + rm_dev_node(dmt->dev_name); + break; + + case DM_DEVICE_STATUS: + case DM_DEVICE_TABLE: + if (!_unmarshal_status_v1(dmt, dmi)) + goto bad; + break; + + case DM_DEVICE_SUSPEND: + case DM_DEVICE_RESUME: + dmt->type = DM_DEVICE_INFO; + if (!dm_task_run(dmt)) + goto bad; + free(dmi); /* We'll use what info returned */ + return 1; + } + + dmt->dmi.v1 = dmi; + return 1; + + bad: + free(dmi); + return 0; +} + +#endif + +/* + * Protocol Version 4 functions. + */ + +int dm_task_get_driver_version(struct dm_task *dmt, char *version, size_t size) +{ + unsigned int *v; + +#ifdef DM_COMPAT + if (_dm_version == 1) + return _dm_task_get_driver_version_v1(dmt, version, size); +#endif + + if (!dmt->dmi.v4) { + version[0] = '\0'; + return 0; + } + + v = dmt->dmi.v4->version; + snprintf(version, size, "%u.%u.%u", v[0], v[1], v[2]); + return 1; +} + +static int _check_version(char *version, size_t size, int log_suppress) +{ + struct dm_task *task; + int r; + + if (!(task = dm_task_create(DM_DEVICE_VERSION))) { + log_error("Failed to get device-mapper version"); + version[0] = '\0'; + return 0; + } + + if (log_suppress) + _log_suppress = 1; + + r = dm_task_run(task); + dm_task_get_driver_version(task, version, size); + dm_task_destroy(task); + _log_suppress = 0; + + return r; +} + +/* + * Find out device-mapper's major version number the first time + * this is called and whether or not we support it. + */ +int dm_check_version(void) +{ + char libversion[64], dmversion[64]; + const char *compat = ""; + + if (_version_checked) + return _version_ok; + + _version_checked = 1; + + if (_check_version(dmversion, sizeof(dmversion), _dm_compat)) + return 1; + + if (!_dm_compat) + goto bad; + + log_verbose("device-mapper ioctl protocol version %d failed. " + "Trying protocol version 1.", _dm_version); + _dm_version = 1; + if (_check_version(dmversion, sizeof(dmversion), 0)) { + log_verbose("Using device-mapper ioctl protocol version 1"); + return 1; + } + + compat = "(compat)"; + + dm_get_library_version(libversion, sizeof(libversion)); + + log_error("Incompatible libdevmapper %s%s and kernel driver %s", + libversion, compat, dmversion); + + bad: + _version_ok = 0; + return 0; +} + +void *dm_get_next_target(struct dm_task *dmt, void *next, + uint64_t *start, uint64_t *length, + char **target_type, char **params) +{ + struct target *t = (struct target *) next; + + if (!t) + t = dmt->head; + + if (!t) + return NULL; + + *start = t->start; + *length = t->length; + *target_type = t->type; + *params = t->params; + + return t->next; +} + +/* Unmarshall the target info returned from a status call */ +static int _unmarshal_status(struct dm_task *dmt, struct dm_ioctl *dmi) +{ + char *outbuf = (char *) dmi + dmi->data_start; + char *outptr = outbuf; + uint32_t i; + struct dm_target_spec *spec; + + for (i = 0; i < dmi->target_count; i++) { + spec = (struct dm_target_spec *) outptr; + if (!dm_task_add_target(dmt, spec->sector_start, + spec->length, + spec->target_type, + outptr + sizeof(*spec))) + return 0; + + outptr = outbuf + spec->next; + } + + return 1; +} + +int dm_format_dev(char *buf, int bufsize, uint32_t dev_major, + uint32_t dev_minor) +{ + int r; + +#ifdef DM_COMPAT + if (_dm_version == 1) + return _dm_format_dev_v1(buf, bufsize, dev_major, dev_minor); +#endif + + if (bufsize < 8) + return 0; + + r = snprintf(buf, bufsize, "%03u:%03u", dev_major, dev_minor); + if (r < 0 || r > bufsize - 1) + return 0; + + return 1; +} + +int dm_task_get_info(struct dm_task *dmt, struct dm_info *info) +{ +#ifdef DM_COMPAT + if (_dm_version == 1) + return _dm_task_get_info_v1(dmt, info); +#endif + + if (!dmt->dmi.v4) + return 0; + + memset(info, 0, sizeof(*info)); + + info->exists = dmt->dmi.v4->flags & DM_EXISTS_FLAG ? 1 : 0; + if (!info->exists) + return 1; + + info->suspended = dmt->dmi.v4->flags & DM_SUSPEND_FLAG ? 1 : 0; + info->read_only = dmt->dmi.v4->flags & DM_READONLY_FLAG ? 1 : 0; + info->live_table = dmt->dmi.v4->flags & DM_ACTIVE_PRESENT_FLAG ? 1 : 0; + info->inactive_table = dmt->dmi.v4->flags & DM_INACTIVE_PRESENT_FLAG ? + 1 : 0; + info->target_count = dmt->dmi.v4->target_count; + info->open_count = dmt->dmi.v4->open_count; + info->event_nr = dmt->dmi.v4->event_nr; + info->major = MAJOR(dmt->dmi.v4->dev); + info->minor = MINOR(dmt->dmi.v4->dev); + + return 1; +} + +const char *dm_task_get_name(struct dm_task *dmt) +{ +#ifdef DM_COMPAT + if (_dm_version == 1) + return _dm_task_get_name_v1(dmt); +#endif + + return (dmt->dmi.v4->name); +} + +const char *dm_task_get_uuid(struct dm_task *dmt) +{ +#ifdef DM_COMPAT + if (_dm_version == 1) + return _dm_task_get_uuid_v1(dmt); +#endif + + return (dmt->dmi.v4->uuid); +} + +struct dm_deps *dm_task_get_deps(struct dm_task *dmt) +{ +#ifdef DM_COMPAT + if (_dm_version == 1) + return _dm_task_get_deps_v1(dmt); +#endif + + return (struct dm_deps *) (((void *) dmt->dmi.v4) + + dmt->dmi.v4->data_start); +} + +struct dm_names *dm_task_get_names(struct dm_task *dmt) +{ +#ifdef DM_COMPAT + if (_dm_version == 1) + return _dm_task_get_names_v1(dmt); +#endif + + return (struct dm_names *) (((void *) dmt->dmi.v4) + + dmt->dmi.v4->data_start); +} + +int dm_task_set_ro(struct dm_task *dmt) +{ + dmt->read_only = 1; + return 1; +} + +int dm_task_set_newname(struct dm_task *dmt, const char *newname) +{ + if (!(dmt->newname = strdup(newname))) { + log_error("dm_task_set_newname: strdup(%s) failed", newname); + return 0; + } + + return 1; +} + +int dm_task_set_event_nr(struct dm_task *dmt, uint32_t event_nr) +{ + dmt->event_nr = event_nr; + + return 1; +} + +struct target *create_target(uint64_t start, uint64_t len, const char *type, + const char *params) +{ + struct target *t = malloc(sizeof(*t)); + + if (!t) { + log_error("create_target: malloc(%d) failed", sizeof(*t)); + return NULL; + } + + memset(t, 0, sizeof(*t)); + + if (!(t->params = strdup(params))) { + log_error("create_target: strdup(params) failed"); + goto bad; + } + + if (!(t->type = strdup(type))) { + log_error("create_target: strdup(type) failed"); + goto bad; + } + + t->start = start; + t->length = len; + return t; + + bad: + free(t->params); + free(t->type); + free(t); + return NULL; +} + +static void *_add_target(struct target *t, void *out, void *end) +{ + void *out_sp = out; + struct dm_target_spec sp; + size_t sp_size = sizeof(struct dm_target_spec); + int len; + const char no_space[] = "Ran out of memory building ioctl parameter"; + + out += sp_size; + if (out >= end) { + log_error(no_space); + return NULL; + } + + sp.status = 0; + sp.sector_start = t->start; + sp.length = t->length; + strncpy(sp.target_type, t->type, sizeof(sp.target_type)); + + len = strlen(t->params); + + if ((out + len + 1) >= end) { + log_error(no_space); + + log_error("t->params= '%s'", t->params); + return NULL; + } + strcpy((char *) out, t->params); + out += len + 1; + + /* align next block */ + out = _align(out, ALIGNMENT); + + sp.next = out - out_sp; + memcpy(out_sp, &sp, sp_size); + + return out; +} + +static struct dm_ioctl *_flatten(struct dm_task *dmt) +{ + const size_t min_size = 16 * 1024; + const int (*version)[3]; + + struct dm_ioctl *dmi; + struct target *t; + size_t len = sizeof(struct dm_ioctl); + void *b, *e; + int count = 0; + + for (t = dmt->head; t; t = t->next) { + len += sizeof(struct dm_target_spec); + len += strlen(t->params) + 1 + ALIGNMENT; + count++; + } + + if (count && dmt->newname) { + log_error("targets and newname are incompatible"); + return NULL; + } + + if (dmt->newname) + len += strlen(dmt->newname) + 1; + + /* + * Give len a minimum size so that we have space to store + * dependencies or status information. + */ + if (len < min_size) + len = min_size; + + if (!(dmi = malloc(len))) + return NULL; + + memset(dmi, 0, len); + + version = &_cmd_data_v4[dmt->type].version; + + dmi->version[0] = (*version)[0]; + dmi->version[1] = (*version)[1]; + dmi->version[2] = (*version)[2]; + + dmi->data_size = len; + dmi->data_start = sizeof(struct dm_ioctl); + + if (dmt->dev_name) + strncpy(dmi->name, dmt->dev_name, sizeof(dmi->name)); + + if (dmt->type == DM_DEVICE_SUSPEND) + dmi->flags |= DM_SUSPEND_FLAG; + if (dmt->read_only) + dmi->flags |= DM_READONLY_FLAG; + + if (dmt->minor >= 0) { + if (dmt->major <= 0) { + log_error("Missing major number for persistent device"); + return NULL; + } + dmi->flags |= DM_PERSISTENT_DEV_FLAG; + dmi->dev = MKDEV(dmt->major, dmt->minor); + } + + if (dmt->uuid) + strncpy(dmi->uuid, dmt->uuid, sizeof(dmi->uuid)); + + dmi->target_count = count; + dmi->event_nr = dmt->event_nr; + + b = (void *) (dmi + 1); + e = (void *) ((char *) dmi + len); + + for (t = dmt->head; t; t = t->next) + if (!(b = _add_target(t, b, e))) + goto bad; + + if (dmt->newname) + strcpy(b, dmt->newname); + + return dmi; + + bad: + free(dmi); + return NULL; +} + +static int _create_and_load_v4(struct dm_task *dmt) +{ + struct dm_task *task; + int r; + + /* Use new task struct to create the device */ + if (!(task = dm_task_create(DM_DEVICE_CREATE))) { + log_error("Failed to create device-mapper task struct"); + return 0; + } + + /* Copy across relevant fields */ + if (dmt->dev_name && !dm_task_set_name(task, dmt->dev_name)) { + dm_task_destroy(task); + return 0; + } + + if (dmt->uuid && !dm_task_set_uuid(task, dmt->uuid)) { + dm_task_destroy(task); + return 0; + } + + task->major = dmt->major; + task->minor = dmt->minor; + + r = dm_task_run(task); + dm_task_destroy(task); + if (!r) + return r; + + /* Next load the table */ + if (!(task = dm_task_create(DM_DEVICE_RELOAD))) { + log_error("Failed to create device-mapper task struct"); + return 0; + } + + /* Copy across relevant fields */ + if (dmt->dev_name && !dm_task_set_name(task, dmt->dev_name)) { + dm_task_destroy(task); + return 0; + } + + task->read_only = dmt->read_only; + task->head = dmt->head; + task->tail = dmt->tail; + + r = dm_task_run(task); + + task->head = NULL; + task->tail = NULL; + dm_task_destroy(task); + if (!r) + return r; + + /* Use the original structure last so the info will be correct */ + dmt->type = DM_DEVICE_RESUME; + dmt->uuid = NULL; + free(dmt->uuid); + + r = dm_task_run(dmt); + + return r; +} + +int dm_task_run(struct dm_task *dmt) +{ + struct dm_ioctl *dmi = NULL; + unsigned int command; + +#ifdef DM_COMPAT + if (_dm_version == 1) + return _dm_task_run_v1(dmt); +#endif + + if ((unsigned) dmt->type >= + (sizeof(_cmd_data_v4) / sizeof(*_cmd_data_v4))) { + log_error("Internal error: unknown device-mapper task %d", + dmt->type); + goto bad; + } + + command = _cmd_data_v4[dmt->type].cmd; + + /* Old-style creation had a table supplied */ + if (dmt->type == DM_DEVICE_CREATE && dmt->head) + return _create_and_load_v4(dmt); + + if (!_open_control()) + return 0; + + dmi = _flatten(dmt); + if (!dmi) { + log_error("Couldn't create ioctl argument"); + return 0; + } + + if (dmt->type == DM_DEVICE_TABLE) + dmi->flags |= DM_STATUS_TABLE_FLAG; + + dmi->flags |= DM_EXISTS_FLAG; /* FIXME */ + log_debug("dm %s %s %s %s", _cmd_data_v4[dmt->type].name, dmi->name, + dmi->uuid, dmt->newname ? dmt->newname : ""); + if (ioctl(_control_fd, command, dmi) < 0) { + if (errno == ENXIO && ((dmt->type == DM_DEVICE_INFO) || + (dmt->type == DM_DEVICE_MKNODES))) { + dmi->flags &= ~DM_EXISTS_FLAG; /* FIXME */ + goto ignore_error; + } + if (_log_suppress) + log_verbose("device-mapper ioctl cmd %d failed: %s", + _IOC_NR(command), strerror(errno)); + else + log_error("device-mapper ioctl cmd %d failed: %s", + _IOC_NR(command), strerror(errno)); + goto bad; + } + + ignore_error: + switch (dmt->type) { + case DM_DEVICE_CREATE: + add_dev_node(dmt->dev_name, MAJOR(dmi->dev), MINOR(dmi->dev)); + break; + + case DM_DEVICE_REMOVE: + rm_dev_node(dmt->dev_name); + break; + + case DM_DEVICE_RENAME: + rename_dev_node(dmt->dev_name, dmt->newname); + break; + + case DM_DEVICE_MKNODES: + if (dmi->flags & DM_EXISTS_FLAG) + add_dev_node(dmt->dev_name, MAJOR(dmi->dev), + MINOR(dmi->dev)); + else + rm_dev_node(dmt->dev_name); + break; + + case DM_DEVICE_STATUS: + case DM_DEVICE_TABLE: + case DM_DEVICE_WAITEVENT: + if (!_unmarshal_status(dmt, dmi)) + goto bad; + break; + } + + dmt->dmi.v4 = dmi; + return 1; + + bad: + free(dmi); + return 0; +} + +void dm_lib_release(void) +{ + if (_control_fd != -1) { + close(_control_fd); + _control_fd = -1; + } + update_devs(); +} + +void dm_lib_exit(void) +{ + if (_control_fd != -1) { + close(_control_fd); + _control_fd = -1; + } + _version_ok = 1; + _version_checked = 0; +} |