diff options
Diffstat (limited to 'utils/blkmapd')
| -rw-r--r-- | utils/blkmapd/Makefile.am | 19 | ||||
| -rw-r--r-- | utils/blkmapd/Makefile.in | 825 | ||||
| -rw-r--r-- | utils/blkmapd/blkmapd.man | 72 | ||||
| -rw-r--r-- | utils/blkmapd/device-discovery.c | 580 | ||||
| -rw-r--r-- | utils/blkmapd/device-discovery.h | 164 | ||||
| -rw-r--r-- | utils/blkmapd/device-inq.c | 247 | ||||
| -rw-r--r-- | utils/blkmapd/device-process.c | 380 | ||||
| -rw-r--r-- | utils/blkmapd/dm-device.c | 525 |
8 files changed, 2812 insertions, 0 deletions
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uninstall-man uninstall-man8 uninstall-sbinPROGRAMS + +.PRECIOUS: Makefile + + +# Tell versions [3.59,3.63) of GNU make to not export all variables. +# Otherwise a system limit (for SysV at least) may be exceeded. +.NOEXPORT: diff --git a/utils/blkmapd/blkmapd.man b/utils/blkmapd/blkmapd.man new file mode 100644 index 0000000..4b3d3f0 --- /dev/null +++ b/utils/blkmapd/blkmapd.man @@ -0,0 +1,72 @@ +.\" +.\" Copyright 2011, Jim Rees. +.\" +.\" You may distribute under the terms of the GNU General Public +.\" License as specified in the file COPYING that comes with the +.\" nfs-utils distribution. +.\" +.TH blkmapd 8 "11 August 2011" +.SH NAME +blkmapd \- pNFS block layout mapping daemon +.SH SYNOPSIS +.B "blkmapd [-h] [-d] [-f]" +.SH DESCRIPTION +The +.B blkmapd +daemon performs device discovery and mapping for the parallel NFS (pNFS) block layout +client [RFC5663]. +.PP +The pNFS block layout protocol builds a complex storage hierarchy from a set +of +.I simple volumes. +These simple volumes are addressed by content, using a signature on the +volume to uniquely name each one. +The daemon locates a volume by examining each block device in the system for +the given signature. +.PP +The topology typically consists of a hierarchy of volumes built by striping, +slicing, and concatenating the simple volumes. +The +.B blkmapd +daemon uses the device-mapper driver to construct logical devices that +reflect the server topology, and passes these devices to the kernel for use +by the pNFS block layout client. +.SH OPTIONS +.TP +.B -h +Display usage message. +.TP +.B -d +Performs device discovery only then exits. +.TP +.B -f +Runs +.B blkmapd +in the foreground and sends output to stderr (as opposed to syslogd) +.SH CONFIGURATION FILE +The +.B blkmapd +daemon recognizes the following value from the +.B [general] +section of the +.I /etc/nfs.conf +configuration file: +.TP +.B pipefs-directory +Tells +.B blkmapd +where to look for the rpc_pipefs filesystem. The default value is +.IR /var/lib/nfs/rpc_pipefs . +.SH SEE ALSO +.BR nfs (5), +.BR dmsetup (8), +.BR nfs.conf (5) +.sp +RFC 5661 for the NFS version 4.1 specification. +.br +RFC 5663 for the pNFS block layout specification. +.SH AUTHORS +.br +Haiying Tang <Tang_Haiying@emc.com> +.br +Jim Rees <rees@umich.edu> diff --git a/utils/blkmapd/device-discovery.c b/utils/blkmapd/device-discovery.c new file mode 100644 index 0000000..a565fdb --- /dev/null +++ b/utils/blkmapd/device-discovery.c @@ -0,0 +1,580 @@ +/* + * device-discovery.c: main function, discovering device and processing + * pipe request from kernel. + * + * Copyright (c) 2010 EMC Corporation, Haiying Tang <Tang_Haiying@emc.com> + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. + * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF + * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#ifdef HAVE_CONFIG_H +#include "config.h" +#endif /* HAVE_CONFIG_H */ + +#include <sys/sysmacros.h> +#include <sys/types.h> +#include <sys/stat.h> +#include <sys/ioctl.h> +#include <sys/mount.h> +#include <sys/select.h> +#include <sys/inotify.h> +#include <linux/kdev_t.h> +#include <scsi/scsi.h> +#include <scsi/scsi_ioctl.h> +#include <scsi/sg.h> +#include <signal.h> + +#include <stdlib.h> +#include <stdio.h> +#include <string.h> +#include <syslog.h> +#include <dirent.h> +#include <ctype.h> +#include <fcntl.h> +#include <unistd.h> +#include <libgen.h> +#include <errno.h> +#include <libdevmapper.h> + +#include "device-discovery.h" +#include "xcommon.h" +#include "nfslib.h" +#include "conffile.h" + +#define EVENT_SIZE (sizeof(struct inotify_event)) +#define EVENT_BUFSIZE (1024 * EVENT_SIZE) + +#define RPCPIPE_DIR NFS_STATEDIR "/rpc_pipefs" +#define PID_FILE "/run/blkmapd.pid" + +#define CONF_SAVE(w, f) do { \ + char *p = f; \ + if (p != NULL) \ + (w) = p; \ +} while (0) + +static char bl_pipe_file[PATH_MAX]; +static char nfspipe_dir[PATH_MAX]; +static char rpcpipe_dir[PATH_MAX]; + +struct bl_disk *visible_disk_list; +int bl_watch_fd, bl_pipe_fd, nfs_pipedir_wfd, rpc_pipedir_wfd; +int pidfd = -1; + + +static struct bl_disk_path *bl_get_path(const char *filepath, + struct bl_disk_path *paths) +{ + struct bl_disk_path *tmp = paths; + + while (tmp) { + if (!strcmp(tmp->full_path, filepath)) + break; + tmp = tmp->next; + } + return tmp; +} + +/* + * For multipath devices, devices state could be PASSIVE/ACTIVE/PSEUDO, + * where PSEUDO > ACTIVE > PASSIVE. Device with highest state is used to + * create pseudo device. So if state is higher, the device path needs to + * be updated. + * If device-mapper multipath support is a must, pseudo devices should + * exist for each multipath device. If not, active device path will be + * chosen for device creation. + */ +static int bl_update_path(enum bl_path_state_e state, struct bl_disk *disk) +{ + struct bl_disk_path *valid_path = disk->valid_path; + + if (valid_path && valid_path->state >= state) + return 0; + return 1; +} + +static void bl_release_disk(void) +{ + struct bl_disk *disk; + struct bl_disk_path *path = NULL; + + while (visible_disk_list) { + disk = visible_disk_list; + path = disk->paths; + while (path) { + disk->paths = path->next; + free(path->full_path); + free(path); + path = disk->paths; + } + if (disk->serial) + free(disk->serial); + visible_disk_list = disk->next; + free(disk); + } +} + +static void bl_add_disk(char *filepath) +{ + struct bl_disk *disk = NULL; + int fd = 0; + struct stat sb; + off_t size = 0; + struct bl_serial *serial = NULL; + enum bl_path_state_e ap_state; + struct bl_disk_path *diskpath = NULL, *path = NULL; + dev_t dev; + + fd = open(filepath, O_RDONLY | O_LARGEFILE); + if (fd < 0) + return; + + if (fstat(fd, &sb)) { + close(fd); + return; + } + + if (!sb.st_size) + ioctl(fd, BLKGETSIZE, &size); + else + size = sb.st_size; + + if (!size) { + close(fd); + return; + } + + dev = sb.st_rdev; + serial = bldev_read_serial(fd, filepath); + if (!serial) { + BL_LOG_ERR("%s: no serial found for %s\n", + __func__, filepath); + ap_state = BL_PATH_STATE_PASSIVE; + } else if (dm_is_dm_major(major(dev))) + ap_state = BL_PATH_STATE_PSEUDO; + else + ap_state = bldev_read_ap_state(fd); + close(fd); + + for (disk = visible_disk_list; disk != NULL; disk = disk->next) { + /* Already scanned or a partition? + * XXX: if released each time, maybe not need to compare + */ + if ((serial->len == disk->serial->len) && + !memcmp(serial->data, disk->serial->data, serial->len)) { + diskpath = bl_get_path(filepath, disk->paths); + break; + } + } + + if (disk && diskpath) { + bl_free_scsi_string(serial); + return; + } + + /* add path */ + path = malloc(sizeof(struct bl_disk_path)); + if (!path) { + BL_LOG_ERR("%s: Out of memory!\n", __func__); + goto out_err; + } + path->next = NULL; + path->state = ap_state; + path->full_path = strdup(filepath); + if (!path->full_path) + goto out_err; + + if (!disk) { /* add disk */ + disk = malloc(sizeof(struct bl_disk)); + if (!disk) { + BL_LOG_ERR("%s: Out of memory!\n", __func__); + goto out_err; + } + disk->next = visible_disk_list; + disk->dev = dev; + disk->size = size; + disk->serial = serial; + disk->valid_path = path; + disk->paths = path; + visible_disk_list = disk; + } else { + path->next = disk->paths; + disk->paths = path; + /* check whether we need to update disk info */ + if (bl_update_path(path->state, disk)) { + disk->dev = dev; + disk->size = size; + disk->valid_path = path; + } + bl_free_scsi_string(serial); + } + return; + + out_err: + if (path) { + if (path->full_path) + free(path->full_path); + free(path); + } + bl_free_scsi_string(serial); + return; +} + +int bl_discover_devices(void) +{ + FILE *f; + int n; + char buf[PATH_MAX], devname[NAME_MAX], fulldevname[PATH_MAX]; + + /* release previous list */ + bl_release_disk(); + + /* scan all block devices */ + f = fopen("/proc/partitions", "r"); + if (f == NULL) + return 0; + + while (1) { + if (fgets(buf, sizeof buf, f) == NULL) + break; + n = sscanf(buf, "%*d %*d %*d %31s", devname); + if (n != 1) + continue; + snprintf(fulldevname, sizeof fulldevname, "/sys/block/%s", + devname); + if (access(fulldevname, F_OK) < 0) + continue; + snprintf(fulldevname, sizeof fulldevname, "/dev/%s", devname); + bl_add_disk(fulldevname); + } + + fclose(f); + + return 0; +} + +/* process kernel request + * return 0: request processed, and no more request waiting; + * return 1: request processed, and more requests waiting; + * return < 0: error + */ +static int bl_disk_inquiry_process(int fd) +{ + int ret = 0; + struct bl_pipemsg_hdr head; + char *buf = NULL; + uint32_t major, minor; + uint16_t buflen; + struct bl_dev_msg reply; + + /* read request */ + if (atomicio(read, fd, &head, sizeof(head)) != sizeof(head)) { + /* Note that an error in this or the next read is pretty + * catastrophic, as there is no good way to resync into + * the pipe's stream. + */ + BL_LOG_ERR("Read pipefs head error!\n"); + ret = -EIO; + goto out; + } + + buflen = head.totallen; + buf = malloc(buflen); + if (!buf) { + BL_LOG_ERR("%s: Out of memory!\n", __func__); + ret = -ENOMEM; + goto out; + } + + if (atomicio(read, fd, buf, buflen) != buflen) { + BL_LOG_ERR("Read pipefs content error!\n"); + ret = -EIO; + goto out; + } + + reply.status = BL_DEVICE_REQUEST_PROC; + + switch (head.type) { + case BL_DEVICE_MOUNT: + /* + * It shouldn't be necessary to discover devices here, since + * process_deviceinfo() will re-discover if it can't find + * the devices it needs. But in the case of multipath + * devices (ones that appear more than once, for example an + * active and a standby LUN), this will re-order them in the + * correct priority. + */ + bl_discover_devices(); + if (!process_deviceinfo(buf, buflen, &major, &minor)) { + reply.status = BL_DEVICE_REQUEST_ERR; + break; + } + reply.major = major; + reply.minor = minor; + break; + case BL_DEVICE_UMOUNT: + if (!dm_device_remove_all((uint64_t *) buf)) + reply.status = BL_DEVICE_REQUEST_ERR; + break; + default: + reply.status = BL_DEVICE_REQUEST_ERR; + break; + } + + /* write to pipefs */ + if (atomicio((void *)write, fd, &reply, sizeof(reply)) + != sizeof(reply)) { + BL_LOG_ERR("Write pipefs error!\n"); + ret = -EIO; + } + + out: + if (buf) + free(buf); + return ret; +} + +static void bl_watch_dir(const char* dir, int *wd) +{ + *wd = inotify_add_watch(bl_watch_fd, dir, IN_CREATE|IN_DELETE); + if (*wd < 0) + BL_LOG_ERR("failed to watch %s: %s\n", dir, strerror(errno)); +} + +static void bl_rpcpipe_cb(void) +{ + int rc, curr_byte = 0; + char eventArr[EVENT_BUFSIZE]; + struct inotify_event *event; + + rc = read(bl_watch_fd, &eventArr, EVENT_BUFSIZE); + if (rc < 0) + BL_LOG_ERR("read event fail: %s", strerror(errno)); + + while (rc > curr_byte) { + event = (struct inotify_event *)&eventArr[curr_byte]; + curr_byte += EVENT_SIZE + event->len; + if (event->wd == rpc_pipedir_wfd) { + if (strncmp(event->name, "nfs", 3)) + continue; + if (event->mask & IN_CREATE) { + BL_LOG_WARNING("nfs pipe dir created\n"); + bl_watch_dir(nfspipe_dir, &nfs_pipedir_wfd); + if (bl_pipe_fd >= 0) + close(bl_pipe_fd); + bl_pipe_fd = open(bl_pipe_file, O_RDWR); + if (bl_pipe_fd < 0) + BL_LOG_ERR("open %s failed: %s\n", + event->name, strerror(errno)); + } else if (event->mask & IN_DELETE) { + BL_LOG_WARNING("nfs pipe dir deleted\n"); + inotify_rm_watch(bl_watch_fd, nfs_pipedir_wfd); + close(bl_pipe_fd); + nfs_pipedir_wfd = -1; + bl_pipe_fd = -1; + } + } else if (event->wd == nfs_pipedir_wfd) { + if (strncmp(event->name, "blocklayout", 11)) + continue; + if (event->mask & IN_CREATE) { + BL_LOG_WARNING("blocklayout pipe file created\n"); + if (bl_pipe_fd >= 0) + close(bl_pipe_fd); + bl_pipe_fd = open(bl_pipe_file, O_RDWR); + if (bl_pipe_fd < 0) + BL_LOG_ERR("open %s failed: %s\n", + event->name, strerror(errno)); + } else if (event->mask & IN_DELETE) { + BL_LOG_WARNING("blocklayout pipe file deleted\n"); + close(bl_pipe_fd); + bl_pipe_fd = -1; + } + } + } +} + +static int bl_event_helper(void) +{ + fd_set rset; + int ret = 0, maxfd; + + for (;;) { + FD_ZERO(&rset); + FD_SET(bl_watch_fd, &rset); + if (bl_pipe_fd > 0) + FD_SET(bl_pipe_fd, &rset); + maxfd = (bl_watch_fd>bl_pipe_fd)?bl_watch_fd:bl_pipe_fd; + switch (select(maxfd + 1, &rset, NULL, NULL, NULL)) { + case -1: + if (errno == EINTR) + continue; + else { + ret = -errno; + goto out; + } + case 0: + goto out; + default: + if (FD_ISSET(bl_watch_fd, &rset)) + bl_rpcpipe_cb(); + else if (bl_pipe_fd > 0 && FD_ISSET(bl_pipe_fd, &rset)) + ret = bl_disk_inquiry_process(bl_pipe_fd); + if (ret) + goto out; + } + } + out: + return ret; +} + +static void sig_die(int signal) +{ + if (pidfd >= 0) { + close(pidfd); + unlink(PID_FILE); + } + BL_LOG_ERR("exit on signal(%d)\n", signal); + exit(0); +} +static void usage(void) +{ + fprintf(stderr, "Usage: blkmapd [-hdf]\n" ); +} +/* Daemon */ +int main(int argc, char **argv) +{ + int opt, dflag = 0, fg = 0, ret = 1; + char pidbuf[64]; + char *xrpcpipe_dir = NULL; + + strncpy(rpcpipe_dir, RPCPIPE_DIR, sizeof(rpcpipe_dir)); + conf_init_file(NFS_CONFFILE); + CONF_SAVE(xrpcpipe_dir, conf_get_str("general", "pipefs-directory")); + if (xrpcpipe_dir != NULL) + strlcpy(rpcpipe_dir, xrpcpipe_dir, sizeof(rpcpipe_dir)); + + strncpy(nfspipe_dir, rpcpipe_dir, sizeof(nfspipe_dir)); + strlcat(nfspipe_dir, "/nfs", sizeof(nfspipe_dir)); + strncpy(bl_pipe_file, rpcpipe_dir, sizeof(bl_pipe_file)); + strlcat(bl_pipe_file, "/nfs/blocklayout", sizeof(bl_pipe_file)); + + while ((opt = getopt(argc, argv, "hdf")) != -1) { + switch (opt) { + case 'd': + dflag = 1; + break; + case 'f': + fg = 1; + break; + case 'h': + usage(); + exit(0); + default: + usage(); + exit(1); + + } + } + + if (fg) { + openlog("blkmapd", LOG_PERROR, 0); + } else { + pid_t pid = fork(); + if (pid < 0) { + BL_LOG_ERR("fork error\n"); + exit(1); + } else if (pid != 0) { + pidfd = open(PID_FILE, O_WRONLY | O_CREAT, 0644); + if (pidfd < 0) { + BL_LOG_ERR("Create pid file %s failed\n", PID_FILE); + exit(1); + } + + if (lockf(pidfd, F_TLOCK, 0) < 0) { + BL_LOG_ERR("Already running; Exiting!"); + close(pidfd); + exit(1); + } + if (ftruncate(pidfd, 0) < 0) + BL_LOG_ERR("ftruncate on %s failed: m\n", PID_FILE); + sprintf(pidbuf, "%d\n", pid); + if (write(pidfd, pidbuf, strlen(pidbuf)) != (ssize_t)strlen(pidbuf)) + BL_LOG_ERR("write on %s failed: m\n", PID_FILE); + exit(0); + } + + (void)setsid(); + if (chdir("/")) { + BL_LOG_ERR("chdir error\n"); + } + int fd = open("/dev/null", O_RDWR, 0); + if (fd >= 0) { + (void)dup2(fd, STDIN_FILENO); + (void)dup2(fd, STDOUT_FILENO); + (void)dup2(fd, STDERR_FILENO); + + (void)close(fd); + } + + openlog("blkmapd", LOG_PID, 0); + } + + signal(SIGINT, sig_die); + signal(SIGTERM, sig_die); + signal(SIGHUP, SIG_IGN); + + if (dflag) { + ret = bl_discover_devices(); + goto out; + } + + if ((bl_watch_fd = inotify_init()) < 0) { + BL_LOG_ERR("init inotify failed %s\n", strerror(errno)); + goto out; + } + + /* open pipe file */ + bl_watch_dir(rpcpipe_dir, &rpc_pipedir_wfd); + bl_watch_dir(nfspipe_dir, &nfs_pipedir_wfd); + + bl_pipe_fd = open(bl_pipe_file, O_RDWR); + if (bl_pipe_fd < 0) + BL_LOG_ERR("open pipe file %s failed: %s\n", bl_pipe_file, strerror(errno)); + + while (1) { + /* discover device when needed */ + bl_discover_devices(); + + ret = bl_event_helper(); + if (ret < 0) { + /* what should we do with process error? */ + BL_LOG_ERR("inquiry process return %d\n", ret); + } + } +out: + if (pidfd >= 0) { + close(pidfd); + unlink(PID_FILE); + } + + exit(ret); +} diff --git a/utils/blkmapd/device-discovery.h b/utils/blkmapd/device-discovery.h new file mode 100644 index 0000000..462aa94 --- /dev/null +++ b/utils/blkmapd/device-discovery.h @@ -0,0 +1,164 @@ +/* + * bl-device-discovery.h + * + * Copyright (c) 2010 EMC Corporation, Haiying Tang <Tang_Haiying@emc.com> + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. + * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF + * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ +#ifndef BL_DEVICE_DISCOVERY_H +#define BL_DEVICE_DISCOVERY_H + +#include <stdint.h> + +enum blk_vol_type { + BLOCK_VOLUME_SIMPLE = 0, /* maps to a single LU */ + BLOCK_VOLUME_SLICE = 1, /* slice of another volume */ + BLOCK_VOLUME_CONCAT = 2, /* concatenation of multiple volumes */ + BLOCK_VOLUME_STRIPE = 3, /* striped across multiple volumes */ + BLOCK_VOLUME_PSEUDO = 4, +}; + +/* All disk offset/lengths are stored in 512-byte sectors */ +struct bl_volume { + uint32_t bv_type; + off_t bv_size; + struct bl_volume **bv_vols; + int bv_vol_n; + union { + dev_t bv_dev; /* for BLOCK_VOLUME_SIMPLE(PSEUDO) */ + off_t bv_stripe_unit; /* for BLOCK_VOLUME_STRIPE(CONCAT) */ + off_t bv_offset; /* for BLOCK_VOLUME_SLICE */ + } param; +}; + +struct bl_sig_comp { + int64_t bs_offset; /* In bytes */ + uint32_t bs_length; /* In bytes */ + char *bs_string; +}; + +/* Maximum number of signatures components in a simple volume */ +# define BLOCK_MAX_SIG_COMP 16 + +struct bl_sig { + int si_num_comps; + struct bl_sig_comp si_comps[BLOCK_MAX_SIG_COMP]; +}; + +/* + * Multipath support: ACTIVE or PSEUDO device is valid, + * PASSIVE is a standby for ACTIVE. + */ +enum bl_path_state_e { + BL_PATH_STATE_PASSIVE = 1, + BL_PATH_STATE_ACTIVE = 2, + BL_PATH_STATE_PSEUDO = 3, +}; + +struct bl_serial { + int len; + char *data; +}; + +struct bl_disk_path { + struct bl_disk_path *next; + char *full_path; + enum bl_path_state_e state; +}; + +struct bl_disk { + struct bl_disk *next; + struct bl_serial *serial; + dev_t dev; + off_t size; /* in 512-byte sectors */ + struct bl_disk_path *valid_path; + struct bl_disk_path *paths; +}; + +struct bl_dev_id { + unsigned char type; + unsigned char ids; + unsigned char reserve; + unsigned char len; + char data[0]; +}; + +struct bl_dev_msg { + int status; + uint32_t major, minor; +}; + +struct bl_pipemsg_hdr { + uint8_t type; + uint16_t totallen; /* length of message excluding hdr */ +}; + +#define BL_DEVICE_UMOUNT 0x0 /* Umount--delete devices */ +#define BL_DEVICE_MOUNT 0x1 /* Mount--create devices */ +#define BL_DEVICE_REQUEST_INIT 0x0 /* Start request */ +#define BL_DEVICE_REQUEST_PROC 0x1 /* User process succeeds */ +#define BL_DEVICE_REQUEST_ERR 0x2 /* User process fails */ + +uint32_t *blk_overflow(uint32_t * p, uint32_t * end, size_t nbytes); + +#define BLK_READBUF(p, e, nbytes) do { \ + p = blk_overflow(p, e, nbytes); \ + if (!p) {\ + goto out_err;\ + } \ +} while (0) + +#define READ32(x) (x) = ntohl(*p++) + +#define READ64(x) do { \ + (x) = (uint64_t)ntohl(*p++) << 32; \ + (x) |= ntohl(*p++); \ +} while (0) + +#define READ_SECTOR(x) do { \ + READ64(tmp); \ + if (tmp & 0x1ff) { \ + goto out_err; \ + } \ + (x) = tmp >> 9; \ +} while (0) + +extern struct bl_disk *visible_disk_list; +uint64_t dm_device_create(struct bl_volume *vols, int num_vols); +int dm_device_remove_all(uint64_t *dev); +uint64_t process_deviceinfo(const char *dev_addr_buf, + unsigned int dev_addr_len, + uint32_t *major, uint32_t *minor); + +extern ssize_t atomicio(ssize_t(*f) (int, void *, size_t), + int fd, void *_s, size_t n); +extern struct bl_serial *bl_create_scsi_string(int len, const char *bytes); +extern void bl_free_scsi_string(struct bl_serial *str); +extern struct bl_serial *bldev_read_serial(int fd, const char *filename); +extern enum bl_path_state_e bldev_read_ap_state(int fd); +extern int bl_discover_devices(void); + +#define BL_LOG_INFO(fmt...) syslog(LOG_INFO, fmt) +#define BL_LOG_WARNING(fmt...) syslog(LOG_WARNING, fmt) +#define BL_LOG_ERR(fmt...) syslog(LOG_ERR, fmt) +#define BL_LOG_DEBUG(fmt...) syslog(LOG_DEBUG, fmt) +#endif diff --git a/utils/blkmapd/device-inq.c b/utils/blkmapd/device-inq.c new file mode 100644 index 0000000..9e5749e --- /dev/null +++ b/utils/blkmapd/device-inq.c @@ -0,0 +1,247 @@ +/* + * device-inq.c: inquire SCSI device information. + * + * Copyright (c) 2010 EMC Corporation, Haiying Tang <Tang_Haiying@emc.com> + * All rights reserved. + * + * This program refers to "SCSI Primary Commands - 3 (SPC-3) + * at http://www.t10.org and sg_inq.c in sg3_utils-1.26 for + * Linux OS SCSI subsystem, by D. Gilbert. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. + * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF + * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ +#include <sys/types.h> +#include <sys/stat.h> +#include <sys/ioctl.h> +#include <sys/mount.h> +#include <sys/select.h> +#include <scsi/scsi.h> +#include <scsi/scsi_ioctl.h> +#include <scsi/sg.h> + +#include <stdlib.h> +#include <stdio.h> +#include <unistd.h> +#include <string.h> +#include <syslog.h> +#include <dirent.h> +#include <ctype.h> +#include <fcntl.h> +#include <libgen.h> +#include <errno.h> + +#include "device-discovery.h" + +#define DEF_ALLOC_LEN 255 +#define MX_ALLOC_LEN (0xc000 + 0x80) + +struct bl_serial *bl_create_scsi_string(int len, const char *bytes) +{ + struct bl_serial *s; + + s = malloc(sizeof(*s) + len); + if (s) { + s->data = (char *)&s[1]; + s->len = len; + memcpy(s->data, bytes, len); + } + return s; +} + +void bl_free_scsi_string(struct bl_serial *str) +{ + if (str) + free(str); +} + +#define sg_io_ok(io_hdr) \ + ((((io_hdr).status & 0x7e) == 0) && \ + ((io_hdr).host_status == 0) && \ + (((io_hdr).driver_status & 0x0f) == 0)) + +static int sg_timeout = 1 * 1000; + +static int bldev_inquire_page(int fd, int page, char *buffer, int len) +{ + unsigned char cmd[] = { INQUIRY, 0, 0, 0, 0, 0 }; + unsigned char sense_b[28]; + struct sg_io_hdr io_hdr; + if (page >= 0) { + cmd[1] = 1; + cmd[2] = page; + } + cmd[3] = (unsigned char)((len >> 8) & 0xff); + cmd[4] = (unsigned char)(len & 0xff); + + memset(&io_hdr, 0, sizeof(struct sg_io_hdr)); + io_hdr.interface_id = 'S'; + io_hdr.cmd_len = sizeof(cmd); + io_hdr.mx_sb_len = sizeof(sense_b); + io_hdr.dxfer_direction = SG_DXFER_FROM_DEV; + io_hdr.dxfer_len = len; + io_hdr.dxferp = buffer; + io_hdr.cmdp = cmd; + io_hdr.sbp = sense_b; + io_hdr.timeout = sg_timeout; + if (ioctl(fd, SG_IO, &io_hdr) < 0) + return -1; + + if (sg_io_ok(io_hdr)) + return 0; + return -1; +} + +static int bldev_inquire_pages(int fd, int page, char **buffer) +{ + int status = 0; + char *tmp; + int len; + + *buffer = calloc(DEF_ALLOC_LEN, sizeof(char)); + if (!*buffer) { + BL_LOG_ERR("%s: Out of memory!\n", __func__); + return -ENOMEM; + } + + status = bldev_inquire_page(fd, page, *buffer, DEF_ALLOC_LEN); + if (status) + goto out; + + status = -1; + if ((*(*buffer + 1) & 0xff) != page) + goto out; + + len = (*(*buffer + 2) << 8) + *(*buffer + 3) + 4; + if (len > MX_ALLOC_LEN) { + BL_LOG_ERR("SCSI response length too long: %d\n", len); + goto out; + } + if (len > DEF_ALLOC_LEN) { + tmp = realloc(*buffer, len); + if (!tmp) { + BL_LOG_ERR("%s: Out of memory!\n", __func__); + status = -ENOMEM; + goto out; + } + *buffer = tmp; + status = bldev_inquire_page(fd, page, *buffer, len); + if (status) + goto out; + } + status = 0; + out: + return status; +} + +/* For EMC multipath devices, use VPD page (0xc0) to get status. + * For other devices, return ACTIVE for now + */ +extern enum bl_path_state_e bldev_read_ap_state(int fd) +{ + int status = 0; + char *buffer = NULL; + enum bl_path_state_e ap_state = BL_PATH_STATE_ACTIVE; + + status = bldev_inquire_pages(fd, 0xc0, &buffer); + if (status) + goto out; + + if (buffer[4] < 0x02) + ap_state = BL_PATH_STATE_PASSIVE; + out: + if (buffer) + free(buffer); + return ap_state; +} + +struct bl_serial *bldev_read_serial(int fd, const char *filename) +{ + struct bl_serial *serial_out = NULL; + int status = 0; + char *buffer; + struct bl_dev_id *dev_root, *dev_id; + unsigned int pos, len, current_id = 0; + size_t devid_len = sizeof(struct bl_dev_id) - sizeof(unsigned char); + + status = bldev_inquire_pages(fd, 0x83, &buffer); + if (status) + goto out; + + dev_root = (struct bl_dev_id *)buffer; + + pos = 0; + current_id = 0; + len = dev_root->len; + + if (len < devid_len) + goto out; + + while (pos < (len - devid_len)) { + dev_id = (struct bl_dev_id *)&(dev_root->data[pos]); + pos += (dev_id->len + devid_len); + + /* Some targets export zero length EVPD pages, + * skip them to not confuse the device id + * cache. + */ + if (!dev_id->len) + continue; + + if ((dev_id->ids & 0xf) < current_id) + continue; + switch (dev_id->ids & 0xf) { + /* We process SCSI ID with four ID cases: 0, 1, 2 and 3. + * When more than one ID is available, priority is + * 3>2>1>0. + */ + case 2: /* EUI-64 based */ + if ((dev_id->len != 8) && (dev_id->len != 12) && + (dev_id->len != 16)) + break; + /* FALLTHRU */ + case 3: /* NAA */ + /* TODO: NAA validity judgement too complicated, + * so just ingore it here. + */ + if ((dev_id->type & 0xf) != 1) { + BL_LOG_ERR("Binary code_set expected\n"); + break; + } + /* FALLTHRU */ + case 0: /* vendor specific */ + case 1: /* T10 vendor identification */ + current_id = dev_id->ids & 0xf; + if (serial_out) + bl_free_scsi_string(serial_out); + serial_out = bl_create_scsi_string(dev_id->len, + dev_id->data); + break; + } + if (current_id == 3) + break; + } + out: + if (!serial_out) + serial_out = bl_create_scsi_string(strlen(filename), filename); + if (buffer) + free(buffer); + return serial_out; +} diff --git a/utils/blkmapd/device-process.c b/utils/blkmapd/device-process.c new file mode 100644 index 0000000..f53a616 --- /dev/null +++ b/utils/blkmapd/device-process.c @@ -0,0 +1,380 @@ +/* + * device-process.c: detailed processing of device information sent + * from kernel. + * + * Copyright (c) 2006 The Regents of the University of Michigan. + * All rights reserved. + * + * Andy Adamson <andros@citi.umich.edu> + * Fred Isaman <iisaman@umich.edu> + * + * Copyright (c) 2010 EMC Corporation, Haiying Tang <Tang_Haiying@emc.com> + * + * Used codes in linux/fs/nfs/blocklayout/blocklayoutdev.c. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. + * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF + * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#include <sys/types.h> +#include <sys/stat.h> +#include <sys/user.h> +#include <arpa/inet.h> +#include <linux/kdev_t.h> + +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> +#include <syslog.h> +#include <fcntl.h> +#include <errno.h> + +#include "device-discovery.h" + +uint32_t *blk_overflow(uint32_t * p, uint32_t * end, size_t nbytes) +{ + uint32_t *q = p + ((nbytes + 3) >> 2); + + if (q > end || q < p) + return NULL; + return p; +} + +static int decode_blk_signature(uint32_t **pp, uint32_t * end, + struct bl_sig *sig) +{ + int i; + uint32_t siglen, *p = *pp; + + BLK_READBUF(p, end, 4); + READ32(sig->si_num_comps); + if (sig->si_num_comps == 0) { + BL_LOG_ERR("0 components in sig\n"); + goto out_err; + } + if (sig->si_num_comps >= BLOCK_MAX_SIG_COMP) { + BL_LOG_ERR("number of sig comps %i >= BLOCK_MAX_SIG_COMP\n", + sig->si_num_comps); + goto out_err; + } + for (i = 0; i < sig->si_num_comps; i++) { + struct bl_sig_comp *comp = &sig->si_comps[i]; + + BLK_READBUF(p, end, 12); + READ64(comp->bs_offset); + READ32(siglen); + comp->bs_length = siglen; + BLK_READBUF(p, end, siglen); + /* Note we rely here on fact that sig is used immediately + * for mapping, then thrown away. + */ + comp->bs_string = (char *)p; + p += ((siglen + 3) >> 2); + } + *pp = p; + return 0; + out_err: + return -EIO; +} + +/* + * Read signature from device and compare to sig_comp + * return: 0=match, 1=no match, -1=error + */ +static int +read_cmp_blk_sig(struct bl_disk *disk, int fd, struct bl_sig_comp *comp) +{ + const char *dev_name = disk->valid_path->full_path; + int ret = -1; + ssize_t siglen = comp->bs_length; + int64_t bs_offset = comp->bs_offset; + char *sig = NULL; + + sig = (char *)malloc(siglen); + if (!sig) { + BL_LOG_ERR("%s: Out of memory\n", __func__); + goto out; + } + + if (bs_offset < 0) + bs_offset += (((int64_t) disk->size) << 9); + if (lseek64(fd, bs_offset, SEEK_SET) == -1) { + BL_LOG_ERR("File %s lseek error\n", dev_name); + goto out; + } + + if (read(fd, sig, siglen) != siglen) { + BL_LOG_ERR("File %s read error\n", dev_name); + goto out; + } + + ret = memcmp(sig, comp->bs_string, siglen); + + out: + if (sig) + free(sig); + return ret; +} + +/* + * All signatures in sig must be found on disk for verification. + * Returns True if sig matches, False otherwise. + */ +static int verify_sig(struct bl_disk *disk, struct bl_sig *sig) +{ + const char *dev_name = disk->valid_path->full_path; + int fd, i, rv; + + fd = open(dev_name, O_RDONLY | O_LARGEFILE); + if (fd < 0) { + BL_LOG_ERR("%s: %s could not be opened for read\n", __func__, + dev_name); + return 0; + } + + rv = 1; + + for (i = 0; i < sig->si_num_comps; i++) { + if (read_cmp_blk_sig(disk, fd, &sig->si_comps[i])) { + rv = 0; + break; + } + } + + if (fd >= 0) + close(fd); + return rv; +} + +/* + * map_sig_to_device() + * Given a signature, walk the list of visible disks searching for + * a match. Returns True if mapping was done, False otherwise. + * + * While we're at it, fill in the vol->bv_size. + */ +static int map_sig_to_device(struct bl_sig *sig, struct bl_volume *vol) +{ + int mapped = 0; + struct bl_disk *disk; + + /* scan disk list to find out match device */ + for (disk = visible_disk_list; disk; disk = disk->next) { + /* FIXME: should we use better algorithm for disk scan? */ + mapped = verify_sig(disk, sig); + if (mapped) { + BL_LOG_INFO("%s: using device %s\n", + __func__, disk->valid_path->full_path); + vol->param.bv_dev = disk->dev; + vol->bv_size = disk->size; + break; + } + } + return mapped; +} + +/* We are given an array of XDR encoded array indices, each of which should + * refer to a previously decoded device. Translate into a list of pointers + * to the appropriate pnfs_blk_volume's. + */ +static int set_vol_array(uint32_t **pp, uint32_t *end, + struct bl_volume *vols, int working) +{ + int i, index; + uint32_t *p = *pp; + struct bl_volume **array = vols[working].bv_vols; + + for (i = 0; i < vols[working].bv_vol_n; i++) { + BLK_READBUF(p, end, 4); + READ32(index); + if ((index < 0) || (index >= working)) { + BL_LOG_ERR("set_vol_array: Id %i out of range\n", + index); + goto out_err; + } + array[i] = &vols[index]; + } + *pp = p; + return 0; + out_err: + return -EIO; +} + +static uint64_t sum_subvolume_sizes(struct bl_volume *vol) +{ + int i; + uint64_t sum = 0; + + for (i = 0; i < vol->bv_vol_n; i++) + sum += vol->bv_vols[i]->bv_size; + return sum; +} + +static int +decode_blk_volume(uint32_t **pp, uint32_t *end, struct bl_volume *vols, int voln, + int *array_cnt) +{ + int status = 0, j; + struct bl_sig sig; + uint32_t *p = *pp; + struct bl_volume *vol = &vols[voln]; + uint64_t tmp; + + BLK_READBUF(p, end, 4); + READ32(vol->bv_type); + + switch (vol->bv_type) { + case BLOCK_VOLUME_SIMPLE: + *array_cnt = 0; + status = decode_blk_signature(&p, end, &sig); + if (status) + return status; + status = map_sig_to_device(&sig, vol); + if (!status) { + BL_LOG_ERR("Could not find disk for device\n"); + return -ENXIO; + } + BL_LOG_INFO("%s: simple %d\n", __func__, voln); + status = 0; + break; + case BLOCK_VOLUME_SLICE: + BLK_READBUF(p, end, 16); + READ_SECTOR(vol->param.bv_offset); + READ_SECTOR(vol->bv_size); + *array_cnt = vol->bv_vol_n = 1; + BL_LOG_INFO("%s: slice %d\n", __func__, voln); + status = set_vol_array(&p, end, vols, voln); + break; + case BLOCK_VOLUME_STRIPE: + BLK_READBUF(p, end, 8); + READ_SECTOR(vol->param.bv_stripe_unit); + off_t stripe_unit = vol->param.bv_stripe_unit; + /* Check limitations imposed by device-mapper */ + if ((stripe_unit & (stripe_unit - 1)) != 0 + || stripe_unit < (off_t) (sysconf(_SC_PAGE_SIZE) >> 9)) + return -EIO; + BLK_READBUF(p, end, 4); + READ32(vol->bv_vol_n); + if (!vol->bv_vol_n) + return -EIO; + *array_cnt = vol->bv_vol_n; + BL_LOG_INFO("%s: stripe %d nvols=%d unit=%ld\n", __func__, voln, + vol->bv_vol_n, (long)stripe_unit); + status = set_vol_array(&p, end, vols, voln); + if (status) + return status; + for (j = 1; j < vol->bv_vol_n; j++) { + if (vol->bv_vols[j]->bv_size != + vol->bv_vols[0]->bv_size) { + BL_LOG_ERR("varying subvol size\n"); + return -EIO; + } + } + vol->bv_size = vol->bv_vols[0]->bv_size * vol->bv_vol_n; + break; + case BLOCK_VOLUME_CONCAT: + BLK_READBUF(p, end, 4); + READ32(vol->bv_vol_n); + if (!vol->bv_vol_n) + return -EIO; + *array_cnt = vol->bv_vol_n; + BL_LOG_INFO("%s: concat %d %d\n", __func__, voln, + vol->bv_vol_n); + status = set_vol_array(&p, end, vols, voln); + if (status) + return status; + vol->bv_size = sum_subvolume_sizes(vol); + break; + default: + BL_LOG_ERR("Unknown volume type %i\n", vol->bv_type); + out_err: + return -EIO; + } + *pp = p; + return status; +} + +uint64_t process_deviceinfo(const char *dev_addr_buf, + unsigned int dev_addr_len, + uint32_t *major, uint32_t *minor) +{ + int num_vols, i, status, count; + uint32_t *p, *end; + struct bl_volume *vols = NULL, **arrays = NULL, **arrays_ptr = NULL; + uint64_t dev = 0; + + p = (uint32_t *) dev_addr_buf; + end = (uint32_t *) ((char *)p + dev_addr_len); + + /* Decode block volume */ + BLK_READBUF(p, end, 4); + READ32(num_vols); + BL_LOG_INFO("%s: %d vols\n", __func__, num_vols); + if (num_vols <= 0) + goto out_err; + + vols = (struct bl_volume *)malloc(num_vols * sizeof(struct bl_volume)); + if (!vols) { + BL_LOG_ERR("%s: Out of memory\n", __func__); + goto out_err; + } + + /* Each volume in vols array needs its own array. Save time by + * allocating them all in one large hunk. Because each volume + * array can only reference previous volumes, and because once + * a concat or stripe references a volume, it may never be + * referenced again, the volume arrays are guaranteed to fit + * in the suprisingly small space allocated. + */ + arrays_ptr = arrays = + (struct bl_volume **)malloc(num_vols * 2 * + sizeof(struct bl_volume *)); + if (!arrays) { + BL_LOG_ERR("%s: Out of memory\n", __func__); + goto out_err; + } + + for (i = 0; i < num_vols; i++) { + vols[i].bv_vols = arrays_ptr; + status = decode_blk_volume(&p, end, vols, i, &count); + if (status) + goto out_err; + arrays_ptr += count; + } + + if (p != end) { + BL_LOG_ERR("p is not equal to end!\n"); + goto out_err; + } + + dev = dm_device_create(vols, num_vols); + if (dev) { + *major = MAJOR(dev); + *minor = MINOR(dev); + } + + out_err: + if (vols) + free(vols); + if (arrays) + free(arrays); + return dev; +} diff --git a/utils/blkmapd/dm-device.c b/utils/blkmapd/dm-device.c new file mode 100644 index 0000000..ee20d54 --- /dev/null +++ b/utils/blkmapd/dm-device.c @@ -0,0 +1,525 @@ +/* + * dm-device.c: create or remove device via device mapper API. + * + * Copyright (c) 2010 EMC Corporation, Haiying Tang <Tang_Haiying@emc.com> + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. + * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF + * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#include <sys/types.h> +#include <sys/stat.h> +#include <linux/kdev_t.h> + +#include <stdio.h> +#include <stdlib.h> +#include <unistd.h> +#include <string.h> +#include <syslog.h> +#include <fcntl.h> +#include <errno.h> +#include <libdevmapper.h> + +#include "device-discovery.h" + +#define DM_DEV_NAME_LEN 256 + +#ifndef DM_MAX_TYPE_NAME +#define DM_MAX_TYPE_NAME 16 +#endif + +#define DM_PARAMS_LEN 512 /* XXX: is this enough for target? */ +#define TYPE_HAS_DEV(type) ((type == BLOCK_VOLUME_SIMPLE) || \ + (type == BLOCK_VOLUME_PSEUDO)) + +struct bl_dm_table { + uint64_t offset; + uint64_t size; + char target_type[DM_MAX_TYPE_NAME]; + char params[DM_PARAMS_LEN]; + struct bl_dm_table *next; +}; + +struct bl_dm_tree { + uint64_t dev; + struct dm_tree *tree; + struct bl_dm_tree *next; +}; + +static const char dm_name[] = "pnfs_vol_%u"; + +static unsigned int dev_count; + +static inline struct bl_dm_table *bl_dm_table_alloc(void) +{ + return (struct bl_dm_table *)calloc(1, sizeof(struct bl_dm_table)); +} + +static void bl_dm_table_free(struct bl_dm_table *bl_table_head) +{ + struct bl_dm_table *p; + + while (bl_table_head) { + p = bl_table_head->next; + free(bl_table_head); + bl_table_head = p; + } +} + +static void add_to_bl_dm_table(struct bl_dm_table **bl_table_head, + struct bl_dm_table *table) +{ + struct bl_dm_table *p; + + if (!*bl_table_head) { + *bl_table_head = table; + return; + } + p = *bl_table_head; + while (p->next) + p = p->next; + p->next = table; +} + +struct bl_dm_tree *bl_tree_head; + +static struct bl_dm_tree *find_bl_dm_tree(uint64_t dev) +{ + struct bl_dm_tree *p; + + for (p = bl_tree_head; p; p = p->next) { + if (p->dev == dev) + break; + } + return p; +} + +static void del_from_bl_dm_tree(uint64_t dev) +{ + struct bl_dm_tree *p, *pre = bl_tree_head; + + for (p = pre; p; p = p->next) { + if (p->dev == dev) { + pre->next = p->next; + if (p == bl_tree_head) + bl_tree_head = bl_tree_head->next; + free(p); + break; + } + pre = p; + } +} + +static void add_to_bl_dm_tree(struct bl_dm_tree *tree) +{ + struct bl_dm_tree *p; + + if (!bl_tree_head) { + bl_tree_head = tree; + return; + } + p = bl_tree_head; + while (p->next) + p = p->next; + p->next = tree; + return; +} + +/* + * Create device via device mapper + * return 0 when creation failed + * return dev no for created device + */ +static uint64_t +dm_device_create_mapped(const char *dev_name, struct bl_dm_table *p) +{ + struct dm_task *dmt; + struct dm_info dminfo; + int ret = 0; + + dmt = dm_task_create(DM_DEVICE_CREATE); + if (!dmt) { + BL_LOG_ERR("Create dm_task for %s failed\n", dev_name); + return 0; + } + ret = dm_task_set_name(dmt, dev_name); + if (!ret) + goto err_out; + + while (p) { + ret = + dm_task_add_target(dmt, p->offset, p->size, p->target_type, + p->params); + if (!ret) + goto err_out; + p = p->next; + } + + ret = dm_task_run(dmt) && dm_task_get_info(dmt, &dminfo) + && dminfo.exists; + + if (!ret) + goto err_out; + + dm_task_update_nodes(); + + err_out: + dm_task_destroy(dmt); + + if (!ret) { + BL_LOG_ERR("Create device %s failed\n", dev_name); + return 0; + } + return MKDEV(dminfo.major, dminfo.minor); +} + +static int dm_device_remove_byname(const char *dev_name) +{ + struct dm_task *dmt; + int ret = 0; + + BL_LOG_INFO("%s: %s\n", __func__, dev_name); + + dmt = dm_task_create(DM_DEVICE_REMOVE); + if (!dmt) + return 0; + + ret = dm_task_set_name(dmt, dev_name) && dm_task_run(dmt); + + dm_task_update_nodes(); + dm_task_destroy(dmt); + + return ret; +} + +static int dm_device_remove(uint64_t dev) +{ + struct dm_task *dmt; + struct dm_names *dmnames; + char *name = NULL; + int ret = 0; + + /* Look for dev_name via dev, if dev_name could be transferred here, + we could jump to DM_DEVICE_REMOVE directly */ + + dmt = dm_task_create(DM_DEVICE_LIST); + if (!dmt) { + BL_LOG_ERR("dm_task creation failed\n"); + goto out; + } + + ret = dm_task_run(dmt); + if (!ret) { + BL_LOG_ERR("dm_task_run failed\n"); + goto out; + } + + dmnames = dm_task_get_names(dmt); + if (!dmnames || !dmnames->dev) { + BL_LOG_ERR("dm_task_get_names failed\n"); + goto out; + } + + while (dmnames) { + if (dmnames->dev == dev) { + name = strdup(dmnames->name); + break; + } + dmnames = (void *)dmnames + dmnames->next; + } + + if (!name) { + BL_LOG_ERR("Could not find device\n"); + goto out; + } + + dm_task_update_nodes(); + + out: + if (dmt) + dm_task_destroy(dmt); + + /* Start to remove device */ + if (name) { + ret = dm_device_remove_byname(name); + free(name); + } + + return ret; +} + +static void dm_devicelist_remove(unsigned int start, unsigned int end) +{ + char dev_name[DM_DEV_NAME_LEN]; + unsigned int count; + + if (start >= dev_count || end <= 1 || start >= end - 1) + return; + + for (count = end - 1; count > start; count--) { + snprintf(dev_name, sizeof dev_name, dm_name, count - 1); + dm_device_remove_byname(dev_name); + } + + return; +} + +static void bl_dm_remove_tree(uint64_t dev) +{ + struct bl_dm_tree *p; + + p = find_bl_dm_tree(dev); + if (!p) + return; + + dm_tree_free(p->tree); + del_from_bl_dm_tree(dev); +} + +static int bl_dm_create_tree(uint64_t dev) +{ + struct dm_tree *tree; + struct bl_dm_tree *bl_tree; + + bl_tree = find_bl_dm_tree(dev); + if (bl_tree) + return 1; + + tree = dm_tree_create(); + if (!tree) + return 0; + + if (!dm_tree_add_dev(tree, MAJOR(dev), MINOR(dev))) { + dm_tree_free(tree); + return 0; + } + + bl_tree = malloc(sizeof(struct bl_dm_tree)); + if (!bl_tree) { + dm_tree_free(tree); + return 0; + } + + bl_tree->dev = dev; + bl_tree->tree = tree; + bl_tree->next = NULL; + add_to_bl_dm_tree(bl_tree); + + return 1; +} + +int dm_device_remove_all(uint64_t *dev) +{ + struct bl_dm_tree *p; + struct dm_tree_node *node; + const char *uuid; + int ret = 0; + uint32_t major, minor; + uint64_t bl_dev; + + memcpy(&major, dev, sizeof(uint32_t)); + memcpy(&minor, (void *)dev + sizeof(uint32_t), sizeof(uint32_t)); + bl_dev = MKDEV(major, minor); + p = find_bl_dm_tree(bl_dev); + if (!p) + return ret; + + node = dm_tree_find_node(p->tree, MAJOR(bl_dev), MINOR(bl_dev)); + if (!node) + return ret; + + uuid = dm_tree_node_get_uuid(node); + if (!uuid) + return ret; + + dm_device_remove(bl_dev); + ret = dm_tree_deactivate_children(node, uuid, strlen(uuid)); + dm_task_update_nodes(); + bl_dm_remove_tree(bl_dev); + + return ret; +} + +static int dm_device_exists(char *dev_name) +{ + char fullname[DM_DEV_NAME_LEN]; + + snprintf(fullname, sizeof fullname, "/dev/mapper/%s", dev_name); + return (access(fullname, F_OK) >= 0); +} + +/* TODO: check the value for DM_DEV_NAME_LEN, DM_TYPE_LEN, DM_PARAMS_LEN */ +uint64_t dm_device_create(struct bl_volume *vols, int num_vols) +{ + uint64_t size, stripe_unit, dev = 0; + unsigned int count = dev_count; + int volnum, i, pos; + struct bl_volume *node; + char *tmp; + struct bl_dm_table *table = NULL; + struct bl_dm_table *bl_table_head = NULL; + unsigned int len; + char *dev_name = NULL; + + /* Create pseudo device here */ + for (volnum = 0; volnum < num_vols; volnum++) { + node = &vols[volnum]; + switch (node->bv_type) { + case BLOCK_VOLUME_SIMPLE: + /* Do not need to create device here */ + dev = node->param.bv_dev; + goto continued; + case BLOCK_VOLUME_SLICE: + table = bl_dm_table_alloc(); + if (!table) + goto out; + table->offset = 0; + table->size = node->bv_size; + strcpy(table->target_type, "linear"); + if (!TYPE_HAS_DEV(node->bv_vols[0]->bv_type)) { + free(table); + goto out; + } + dev = node->bv_vols[0]->param.bv_dev; + tmp = table->params; + BL_LOG_INFO("%s: major %llu minor %llu", __func__, + (long long unsigned)MAJOR(dev), + (long long unsigned)MINOR(dev)); + if (!dm_format_dev(tmp, DM_PARAMS_LEN, + MAJOR(dev), MINOR(dev))) { + free(table); + goto out; + } + tmp += strlen(tmp); + sprintf(tmp, " %llu", + (long long unsigned)node->param.bv_offset); + add_to_bl_dm_table(&bl_table_head, table); + break; + case BLOCK_VOLUME_STRIPE: + table = bl_dm_table_alloc(); + if (!table) + goto out; + table->offset = 0; + /* Truncate size to a stripe unit boundary */ + stripe_unit = node->param.bv_stripe_unit; + table->size = + node->bv_size - (node->bv_size % stripe_unit); + strcpy(table->target_type, "striped"); + sprintf(table->params, "%d %llu %n", node->bv_vol_n, + (long long unsigned) stripe_unit, &pos); + /* Copy subdev major:minor to params */ + tmp = table->params + pos; + len = DM_PARAMS_LEN - pos; + for (i = 0; i < node->bv_vol_n; i++) { + if (!TYPE_HAS_DEV(node->bv_vols[i]->bv_type)) { + free(table); + goto out; + } + dev = node->bv_vols[i]->param.bv_dev; + if (!dm_format_dev(tmp, len, MAJOR(dev), + MINOR(dev))) { + free(table); + goto out; + } + pos = strlen(tmp); + tmp += pos; + len -= pos; + sprintf(tmp, " %d ", 0); + tmp += 3; + len -= 3; + } + add_to_bl_dm_table(&bl_table_head, table); + break; + case BLOCK_VOLUME_CONCAT: + size = 0; + for (i = 0; i < node->bv_vol_n; i++) { + table = bl_dm_table_alloc(); + if (!table) + goto out; + table->offset = size; + table->size = node->bv_vols[i]->bv_size; + if (!TYPE_HAS_DEV(node->bv_vols[i]->bv_type)) { + free(table); + goto out; + } + strcpy(table->target_type, "linear"); + tmp = table->params; + dev = node->bv_vols[i]->param.bv_dev; + BL_LOG_INFO("%s: major %lu minor %lu", __func__, + (long unsigned int)MAJOR(dev), + (long unsigned int)MINOR(dev)); + if (!dm_format_dev(tmp, DM_PARAMS_LEN, + MAJOR(dev), MINOR(dev))) { + free(table); + goto out; + } + tmp += strlen(tmp); + sprintf(tmp, " %d", 0); + size += table->size; + add_to_bl_dm_table(&bl_table_head, table); + } + break; + default: + /* Delete previous temporary devices */ + dm_devicelist_remove(count, dev_count); + goto out; + } /* end of swtich */ + /* Create dev_name here. Name of device is pnfs_vol_XXX */ + if (dev_name) + free(dev_name); + dev_name = (char *)calloc(DM_DEV_NAME_LEN, sizeof(char)); + if (!dev_name) { + BL_LOG_ERR("%s: Out of memory\n", __func__); + goto out; + } + do { + snprintf(dev_name, DM_DEV_NAME_LEN, dm_name, + dev_count++); + } while (dm_device_exists(dev_name)); + + dev = dm_device_create_mapped(dev_name, bl_table_head); + BL_LOG_INFO("%s: %d %s %d:%d\n", __func__, volnum, dev_name, + (int) MAJOR(dev), (int) MINOR(dev)); + if (!dev) { + /* Delete previous temporary devices */ + dm_devicelist_remove(count, dev_count); + goto out; + } + node->param.bv_dev = dev; + /* TODO: extend use with PSEUDO later */ + node->bv_type = BLOCK_VOLUME_PSEUDO; + + continued: + if (bl_table_head) + bl_dm_table_free(bl_table_head); + bl_table_head = NULL; + } + out: + if (bl_table_head) { + bl_dm_table_free(bl_table_head); + bl_table_head = NULL; + } + if (dev) + bl_dm_create_tree(dev); + if (dev_name) + free(dev_name); + return dev; +} |