This daemon is required to handle upcalls from the kernel pnfs block layout
driver.
Signed-off-by: Jim Rees <rees@xxxxxxxxx>
---
.gitignore | 1 +
configure.ac | 4 +
utils/Makefile.am | 4 +
utils/blkmapd/Makefile.am | 19 ++
utils/blkmapd/blkmapd.man | 54 ++++
utils/blkmapd/device-discovery.c | 453 +++++++++++++++++++++++++++++++++
utils/blkmapd/device-discovery.h | 162 ++++++++++++
utils/blkmapd/device-inq.c | 233 +++++++++++++++++
utils/blkmapd/device-process.c | 407 ++++++++++++++++++++++++++++++
utils/blkmapd/dm-device.c | 518 ++++++++++++++++++++++++++++++++++++++
10 files changed, 1855 insertions(+), 0 deletions(-)
create mode 100644 utils/blkmapd/Makefile.am
create mode 100644 utils/blkmapd/blkmapd.man
create mode 100644 utils/blkmapd/device-discovery.c
create mode 100644 utils/blkmapd/device-discovery.h
create mode 100644 utils/blkmapd/device-inq.c
create mode 100644 utils/blkmapd/device-process.c
create mode 100644 utils/blkmapd/dm-device.c
diff --git a/.gitignore b/.gitignore
index f5b5cf0..7bd9921 100644
--- a/.gitignore
+++ b/.gitignore
@@ -36,6 +36,7 @@ support/include/stamp-h1
lib*.a
tools/rpcgen/rpcgen
tools/rpcdebug/rpcdebug
+utils/blkmapd/blkmapd
utils/exportfs/exportfs
utils/idmapd/idmapd
utils/lockd/lockd
diff --git a/configure.ac b/configure.ac
index c9fb27b..08ef029 100644
--- a/configure.ac
+++ b/configure.ac
@@ -64,11 +64,14 @@ AC_ARG_ENABLE(nfsv4,
enable_nfsv4=yes)
if test "$enable_nfsv4" = yes; then
AC_DEFINE(NFS4_SUPPORTED, 1, [Define this if you want NFSv4 support compiled in])
+ BLKMAPD=blkmapd
IDMAPD=idmapd
else
enable_nfsv4=
+ BLKMAPD=
IDMAPD=
fi
+ AC_SUBST(BLKMAPD)
AC_SUBST(IDMAPD)
AC_SUBST(enable_nfsv4)
AM_CONDITIONAL(CONFIG_NFSV4, [test "$enable_nfsv4" = "yes"])
@@ -450,6 +453,7 @@ AC_CONFIG_FILES([
tools/mountstats/Makefile
tools/nfs-iostat/Makefile
utils/Makefile
+ utils/blkmapd/Makefile
utils/exportfs/Makefile
utils/gssd/Makefile
utils/idmapd/Makefile
diff --git a/utils/Makefile.am b/utils/Makefile.am
index a0ea116..0d222f0 100644
--- a/utils/Makefile.am
+++ b/utils/Makefile.am
@@ -9,6 +9,10 @@ OPTDIRS += nfsidmap
endif
endif
+if CONFIG_NFSV4
+OPTDIRS += blkmapd
+endif
+
if CONFIG_GSS
OPTDIRS += gssd
endif
diff --git a/utils/blkmapd/Makefile.am b/utils/blkmapd/Makefile.am
new file mode 100644
index 0000000..70e299e
--- /dev/null
+++ b/utils/blkmapd/Makefile.am
@@ -0,0 +1,19 @@
+## Process this file with automake to produce Makefile.in
+
+#man8_MANS = blkmapd.man
+
+AM_CFLAGS += -D_LARGEFILE64_SOURCE
+sbin_PROGRAMS = blkmapd
+
+blkmapd_SOURCES = \
+ device-discovery.c \
+ device-inq.c \
+ device-process.c \
+ dm-device.c \
+ \
+ device-discovery.h
+
+blkmapd_LDADD = -ldevmapper ../../support/nfs/libnfs.a
+
+MAINTAINERCLEANFILES = Makefile.in
+
diff --git a/utils/blkmapd/blkmapd.man b/utils/blkmapd/blkmapd.man
new file mode 100644
index 0000000..fd38122
--- /dev/null
+++ b/utils/blkmapd/blkmapd.man
@@ -0,0 +1,54 @@
+.\"
+.\" 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 [-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 -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 SEE ALSO
+.BR nfs (5),
+.BR dmsetup (8)
+.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@xxxxxxx>
+.br
+Jim Rees <rees@xxxxxxxxx>
diff --git a/utils/blkmapd/device-discovery.c b/utils/blkmapd/device-discovery.c
new file mode 100644
index 0000000..c21de3e
--- /dev/null
+++ b/utils/blkmapd/device-discovery.c
@@ -0,0 +1,453 @@
+/*
+ * device-discovery.c: main function, discovering device and processing
+ * pipe request from kernel.
+ *
+ * Copyright (c) 2010 EMC Corporation, Haiying Tang <Tang_Haiying@xxxxxxx>
+ * 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 <sys/ioctl.h>
+#include <sys/mount.h>
+#include <sys/select.h>
+#include <linux/kdev_t.h>
+#include <scsi/scsi.h>
+#include <scsi/scsi_ioctl.h>
+#include <scsi/sg.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"
+
+#define BL_PIPE_FILE "/var/lib/nfs/rpc_pipefs/nfs/blocklayout"
+#define PID_FILE "/var/run/blkmapd.pid"
+
+struct bl_disk *visible_disk_list;
+
+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;
+}
+
+/* Check whether valid_path is a substring(partition) of path */
+int bl_is_partition(struct bl_disk_path *valid_path, struct bl_disk_path *path)
+{
+ if (!strncmp(valid_path->full_path, path->full_path,
+ strlen(valid_path->full_path)))
+ return 1;
+
+ return 0;
+}
+
+/*
+ * 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.
+ * Treat partition as invalid path.
+ */
+int bl_update_path(struct bl_disk_path *path, enum bl_path_state_e state,
+ struct bl_disk *disk)
+{
+ struct bl_disk_path *valid_path = disk->valid_path;
+
+ if (valid_path) {
+ if (valid_path->state >= state) {
+ if (bl_is_partition(valid_path, path))
+ return 0;
+ }
+ }
+ return 1;
+}
+
+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);
+ }
+}
+
+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 (dm_is_dm_major(major(dev)))
+ ap_state = BL_PATH_STATE_PSEUDO;
+ else
+ ap_state = bldev_read_ap_state(fd);
+ close(fd);
+
+ if (ap_state != BL_PATH_STATE_ACTIVE)
+ return;
+
+ 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)
+ 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, path->state, disk)) {
+ disk->dev = dev;
+ disk->size = size;
+ disk->valid_path = path;
+ }
+ }
+ return;
+
+ out_err:
+ if (path) {
+ if (path->full_path)
+ free(path->full_path);
+ free(path);
+ }
+ return;
+}
+
+int bl_discover_devices(void)
+{
+ FILE *f;
+ int n;
+ char buf[PATH_MAX], devname[PATH_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
+ */
+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;
+}
+
+/* TODO: set bl_process_stop to 1 in command */
+unsigned int bl_process_stop;
+
+int bl_run_disk_inquiry_process(int fd)
+{
+ fd_set rset;
+ int ret;
+
+ bl_process_stop = 0;
+
+ for (;;) {
+ if (bl_process_stop)
+ return 1;
+ FD_ZERO(&rset);
+ FD_SET(fd, &rset);
+ ret = 0;
+ switch (select(fd + 1, &rset, NULL, NULL, NULL)) {
+ case -1:
+ if (errno == EINTR)
+ continue;
+ else {
+ ret = -errno;
+ goto out;
+ }
+ case 0:
+ goto out;
+ default:
+ if (FD_ISSET(fd, &rset))
+ ret = bl_disk_inquiry_process(fd);
+ }
+ }
+ out:
+ return ret;
+}
+
+/* Daemon */
+int main(int argc, char **argv)
+{
+ int fd, pidfd = -1, opt, dflag = 0, fg = 0, ret = 1;
+ struct stat statbuf;
+ char pidbuf[64];
+
+ while ((opt = getopt(argc, argv, "df")) != -1) {
+ switch (opt) {
+ case 'd':
+ dflag = 1;
+ break;
+ case 'f':
+ fg = 1;
+ break;
+ }
+ }
+
+ if (fg) {
+ openlog("blkmapd", LOG_PERROR, 0);
+ } else {
+ if (!stat(PID_FILE, &statbuf)) {
+ fprintf(stderr, "Pid file %s already existed\n", PID_FILE);
+ exit(1);
+ }
+
+ if (daemon(0, 0) != 0) {
+ fprintf(stderr, "Daemonize failed\n");
+ exit(1);
+ }
+
+ openlog("blkmapd", LOG_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("Lock pid file %s failed\n", PID_FILE);
+ close(pidfd);
+ exit(1);
+ }
+ ftruncate(pidfd, 0);
+ sprintf(pidbuf, "%d\n", getpid());
+ write(pidfd, pidbuf, strlen(pidbuf));
+ }
+
+ if (dflag) {
+ bl_discover_devices();
+ exit(0);
+ }
+
+ /* open pipe file */
+ fd = open(BL_PIPE_FILE, O_RDWR);
+ if (fd < 0) {
+ BL_LOG_ERR("open pipe file %s error\n", BL_PIPE_FILE);
+ exit(1);
+ }
+
+ while (1) {
+ /* discover device when needed */
+ bl_discover_devices();
+
+ ret = bl_run_disk_inquiry_process(fd);
+ if (ret < 0) {
+ /* what should we do with process error? */
+ BL_LOG_ERR("inquiry process return %d\n", ret);
+ }
+ }
+
+ 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..a86eed9
--- /dev/null
+++ b/utils/blkmapd/device-discovery.h
@@ -0,0 +1,162 @@
+/*
+ * bl-device-discovery.h
+ *
+ * Copyright (c) 2010 EMC Corporation, Haiying Tang <Tang_Haiying@xxxxxxx>
+ * 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 *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..eabc70c
--- /dev/null
+++ b/utils/blkmapd/device-inq.c
@@ -0,0 +1,233 @@
+/*
+ * device-inq.c: inquire SCSI device information.
+ *
+ * Copyright (c) 2010 EMC Corporation, Haiying Tang <Tang_Haiying@xxxxxxx>
+ * 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)
+
+static 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;
+}
+
+static 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;
+
+ 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;
+ while (pos < (len - sizeof(struct bl_dev_id) + sizeof(unsigned char))) {
+ dev_id = (struct bl_dev_id *)&(dev_root->data[pos]);
+ 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;
+ 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;
+ }
+ 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;
+ pos += (dev_id->len + sizeof(struct bl_dev_id) -
+ sizeof(unsigned char));
+ }
+ 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..27ff374
--- /dev/null
+++ b/utils/blkmapd/device-process.c
@@ -0,0 +1,407 @@
+/*
+ * 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@xxxxxxxxxxxxxx>
+ * Fred Isaman <iisaman@xxxxxxxxx>
+ *
+ * Copyright (c) 2010 EMC Corporation, Haiying Tang <Tang_Haiying@xxxxxxx>
+ *
+ * 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"
+
+static char *pretty_sig(char *sig, uint32_t siglen)
+{
+ static char rs[100];
+ uint64_t sigval;
+ unsigned int i;
+
+ if (siglen <= sizeof(sigval)) {
+ sigval = 0;
+ for (i = 0; i < siglen; i++)
+ sigval |= ((unsigned char *)sig)[i] << (i * 8);
+ sprintf(rs, "0x%0llx", (unsigned long long) sigval);
+ } else {
+ if (siglen > sizeof rs - 4) {
+ siglen = sizeof rs - 4;
+ sprintf(&rs[siglen], "...");
+ } else
+ rs[siglen] = '\0';
+ memcpy(rs, sig, siglen);
+ }
+ return rs;
+}
+
+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;
+ BL_LOG_INFO("%s: si_comps[%d]: bs_length %d, bs_string %s\n",
+ __func__, i, siglen,
+ pretty_sig(comp->bs_string, siglen));
+ 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);
+ if (!ret)
+ BL_LOG_INFO("%s: %s sig %s at %lld\n", __func__, dev_name,
+ pretty_sig(sig, siglen),
+ (long long)comp->bs_offset);
+
+ 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) {
+ 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) (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..0f4f148
--- /dev/null
+++ b/utils/blkmapd/dm-device.c
@@ -0,0 +1,518 @@
+/*
+ * dm-device.c: create or remove device via device mapper API.
+ *
+ * Copyright (c) 2010 EMC Corporation, Haiying Tang <Tang_Haiying@xxxxxxx>
+ * 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;
+}
+
+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;
+ if (!dm_format_dev(tmp, DM_PARAMS_LEN,
+ MAJOR(dev), MINOR(dev))) {
+ free(table);
+ goto out;
+ }
+ tmp += strlen(tmp);
+ sprintf(tmp, " %lu", 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;
+ 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;
+}
--
1.7.4.1
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