diff options
Diffstat (limited to 'lib/libcam/camlib.c')
| -rw-r--r-- | lib/libcam/camlib.c | 737 |
1 files changed, 737 insertions, 0 deletions
diff --git a/lib/libcam/camlib.c b/lib/libcam/camlib.c new file mode 100644 index 0000000..47ca384 --- /dev/null +++ b/lib/libcam/camlib.c @@ -0,0 +1,737 @@ +/* + * Copyright (c) 1997, 1998, 1999, 2002 Kenneth D. Merry. + * 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. The name of the author may not be used to endorse or promote products + * derived from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <sys/types.h> +#include <sys/param.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <fcntl.h> +#include <unistd.h> +#include <errno.h> +#include <ctype.h> + +#include <cam/cam.h> +#include <cam/scsi/scsi_all.h> +#include <cam/cam_ccb.h> +#include <cam/scsi/scsi_pass.h> +#include "camlib.h" + + +static const char *nonrewind_devs[] = { + "sa" +}; + +char cam_errbuf[CAM_ERRBUF_SIZE]; + +static struct cam_device *cam_real_open_device(const char *path, int flags, + struct cam_device *device, + const char *given_path, + const char *given_dev_name, + int given_unit_number); +static struct cam_device *cam_lookup_pass(const char *dev_name, int unit, + int flags, const char *given_path, + struct cam_device *device); + +/* + * Send a ccb to a passthrough device. + */ +int +cam_send_ccb(struct cam_device *device, union ccb *ccb) +{ + return(ioctl(device->fd, CAMIOCOMMAND, ccb)); +} + +/* + * Malloc a CCB, zero out the header and set its path, target and lun ids. + */ +union ccb * +cam_getccb(struct cam_device *dev) +{ + union ccb *ccb; + + ccb = (union ccb *)malloc(sizeof(union ccb)); + if (ccb != NULL) { + bzero(&ccb->ccb_h, sizeof(struct ccb_hdr)); + ccb->ccb_h.path_id = dev->path_id; + ccb->ccb_h.target_id = dev->target_id; + ccb->ccb_h.target_lun = dev->target_lun; + } + + return(ccb); +} + +/* + * Free a CCB. + */ +void +cam_freeccb(union ccb *ccb) +{ + free(ccb); +} + +/* + * Take a device name or path passed in by the user, and attempt to figure + * out the device name and unit number. Some possible device name formats are: + * /dev/foo0 + * foo0 + * nfoo0 + * + * Some peripheral drivers create separate device nodes with 'n' prefix for + * non-rewind operations. Currently only sa(4) tape driver has this feature. + * We extract pure peripheral name as device name for this special case. + * + * Input parameters: device name/path, length of devname string + * Output: device name, unit number + * Return values: returns 0 for success, -1 for failure + */ +int +cam_get_device(const char *path, char *dev_name, int devnamelen, int *unit) +{ + char *func_name = "cam_get_device"; + char *tmpstr, *tmpstr2; + char *newpath; + int unit_offset; + int i; + + + if (path == NULL) { + sprintf(cam_errbuf, "%s: device pathname was NULL", func_name); + return(-1); + } + + /* + * We can be rather destructive to the path string. Make a copy of + * it so we don't hose the user's string. + */ + newpath = (char *)strdup(path); + tmpstr = newpath; + + /* + * Check to see whether we have an absolute pathname. + */ + if (*tmpstr == '/') { + tmpstr2 = tmpstr; + tmpstr = (char *)rindex(tmpstr2, '/'); + if ((tmpstr != NULL) && (*tmpstr != '\0')) + tmpstr++; + } + + if (*tmpstr == '\0') { + sprintf(cam_errbuf, "%s: no text after slash", func_name); + free(newpath); + return(-1); + } + + /* + * Check to see whether the user has given us a nonrewound tape + * device. + */ + if (*tmpstr == 'n' || *tmpstr == 'e') { + for (i = 0; i < sizeof(nonrewind_devs)/sizeof(char *); i++) { + int len = strlen(nonrewind_devs[i]); + if (strncmp(tmpstr + 1, nonrewind_devs[i], len) == 0) { + if (isdigit(tmpstr[len + 1])) { + tmpstr++; + break; + } + } + } + } + + /* + * We should now have just a device name and unit number. + * That means that there must be at least 2 characters. + * If we only have 1, we don't have a valid device name. + */ + if (strlen(tmpstr) < 2) { + sprintf(cam_errbuf, + "%s: must have both device name and unit number", + func_name); + free(newpath); + return(-1); + } + + /* + * If the first character of the string is a digit, then the user + * has probably given us all numbers. Point out the error. + */ + if (isdigit(*tmpstr)) { + sprintf(cam_errbuf, + "%s: device name cannot begin with a number", + func_name); + free(newpath); + return(-1); + } + + /* + * At this point, if the last character of the string isn't a + * number, we know the user either didn't give us a device number, + * or he gave us a device name/number format we don't recognize. + */ + if (!isdigit(tmpstr[strlen(tmpstr) - 1])) { + sprintf(cam_errbuf, "%s: unable to find device unit number", + func_name); + free(newpath); + return(-1); + } + + /* + * Attempt to figure out where the device name ends and the unit + * number begins. As long as unit_offset is at least 1 less than + * the length of the string, we can still potentially have a device + * name at the front of the string. When we get to something that + * isn't a digit, we've hit the device name. Because of the check + * above, we know that this cannot happen when unit_offset == 1. + * Therefore it is okay to decrement unit_offset -- it won't cause + * us to go past the end of the character array. + */ + for (unit_offset = 1; + (unit_offset < (strlen(tmpstr))) + && (isdigit(tmpstr[strlen(tmpstr) - unit_offset])); unit_offset++); + + unit_offset--; + + /* + * Grab the unit number. + */ + *unit = atoi(&tmpstr[strlen(tmpstr) - unit_offset]); + + /* + * Put a null in place of the first number of the unit number so + * that all we have left is the device name. + */ + tmpstr[strlen(tmpstr) - unit_offset] = '\0'; + + strlcpy(dev_name, tmpstr, devnamelen); + + /* Clean up allocated memory */ + free(newpath); + + return(0); + +} + +/* + * Backwards compatible wrapper for the real open routine. This translates + * a pathname into a device name and unit number for use with the real open + * routine. + */ +struct cam_device * +cam_open_device(const char *path, int flags) +{ + int unit; + char dev_name[DEV_IDLEN + 1]; + + /* + * cam_get_device() has already put an error message in cam_errbuf, + * so we don't need to. + */ + if (cam_get_device(path, dev_name, sizeof(dev_name), &unit) == -1) + return(NULL); + + return(cam_lookup_pass(dev_name, unit, flags, path, NULL)); +} + +/* + * Open the passthrough device for a given bus, target and lun, if the + * passthrough device exists. + */ +struct cam_device * +cam_open_btl(path_id_t path_id, target_id_t target_id, lun_id_t target_lun, + int flags, struct cam_device *device) +{ + union ccb ccb; + struct periph_match_pattern *match_pat; + char *func_name = "cam_open_btl"; + int fd, bufsize; + + if ((fd = open(XPT_DEVICE, O_RDWR)) < 0) { + snprintf(cam_errbuf, CAM_ERRBUF_SIZE, + "%s: couldn't open %s\n%s: %s", func_name, XPT_DEVICE, + func_name, strerror(errno)); + return(NULL); + } + + bzero(&ccb, sizeof(union ccb)); + ccb.ccb_h.func_code = XPT_DEV_MATCH; + ccb.ccb_h.path_id = CAM_XPT_PATH_ID; + ccb.ccb_h.target_id = CAM_TARGET_WILDCARD; + ccb.ccb_h.target_lun = CAM_LUN_WILDCARD; + + /* Setup the result buffer */ + bufsize = sizeof(struct dev_match_result); + ccb.cdm.match_buf_len = bufsize; + ccb.cdm.matches = (struct dev_match_result *)malloc(bufsize); + if (ccb.cdm.matches == NULL) { + snprintf(cam_errbuf, CAM_ERRBUF_SIZE, + "%s: couldn't malloc match buffer", func_name); + close(fd); + return(NULL); + } + ccb.cdm.num_matches = 0; + + /* Setup the pattern buffer */ + ccb.cdm.num_patterns = 1; + ccb.cdm.pattern_buf_len = sizeof(struct dev_match_pattern); + ccb.cdm.patterns = (struct dev_match_pattern *)malloc( + sizeof(struct dev_match_pattern)); + if (ccb.cdm.patterns == NULL) { + snprintf(cam_errbuf, CAM_ERRBUF_SIZE, + "%s: couldn't malloc pattern buffer", func_name); + free(ccb.cdm.matches); + close(fd); + return(NULL); + } + ccb.cdm.patterns[0].type = DEV_MATCH_PERIPH; + match_pat = &ccb.cdm.patterns[0].pattern.periph_pattern; + + /* + * We're looking for the passthrough device associated with this + * particular bus/target/lun. + */ + sprintf(match_pat->periph_name, "pass"); + match_pat->path_id = path_id; + match_pat->target_id = target_id; + match_pat->target_lun = target_lun; + /* Now set the flags to indicate what we're looking for. */ + match_pat->flags = PERIPH_MATCH_PATH | PERIPH_MATCH_TARGET | + PERIPH_MATCH_LUN | PERIPH_MATCH_NAME; + + if (ioctl(fd, CAMIOCOMMAND, &ccb) == -1) { + sprintf(cam_errbuf, "%s: CAMIOCOMMAND ioctl failed\n" + "%s: %s", func_name, func_name, strerror(errno)); + goto btl_bailout; + } + + /* + * Check for an outright error. + */ + if ((ccb.ccb_h.status != CAM_REQ_CMP) + || ((ccb.cdm.status != CAM_DEV_MATCH_LAST) + && (ccb.cdm.status != CAM_DEV_MATCH_MORE))) { + sprintf(cam_errbuf, "%s: CAM error %#x, CDM error %d " + "returned from XPT_DEV_MATCH ccb", func_name, + ccb.ccb_h.status, ccb.cdm.status); + goto btl_bailout; + } + + if (ccb.cdm.status == CAM_DEV_MATCH_MORE) { + sprintf(cam_errbuf, "%s: CDM reported more than one" + " passthrough device at %d:%d:%d!!\n", + func_name, path_id, target_id, target_lun); + goto btl_bailout; + } + + if (ccb.cdm.num_matches == 0) { + sprintf(cam_errbuf, "%s: no passthrough device found at" + " %d:%d:%d", func_name, path_id, target_id, + target_lun); + goto btl_bailout; + } + + switch(ccb.cdm.matches[0].type) { + case DEV_MATCH_PERIPH: { + int pass_unit; + char dev_path[256]; + struct periph_match_result *periph_result; + + periph_result = &ccb.cdm.matches[0].result.periph_result; + pass_unit = periph_result->unit_number; + free(ccb.cdm.matches); + free(ccb.cdm.patterns); + close(fd); + sprintf(dev_path, "/dev/pass%d", pass_unit); + return(cam_real_open_device(dev_path, flags, device, NULL, + NULL, 0)); + break; /* NOTREACHED */ + } + default: + sprintf(cam_errbuf, "%s: asked for a peripheral match, but" + " got a bus or device match", func_name); + goto btl_bailout; + break; /* NOTREACHED */ + } + +btl_bailout: + free(ccb.cdm.matches); + free(ccb.cdm.patterns); + close(fd); + return(NULL); +} + +struct cam_device * +cam_open_spec_device(const char *dev_name, int unit, int flags, + struct cam_device *device) +{ + return(cam_lookup_pass(dev_name, unit, flags, NULL, device)); +} + +struct cam_device * +cam_open_pass(const char *path, int flags, struct cam_device *device) +{ + return(cam_real_open_device(path, flags, device, path, NULL, 0)); +} + +static struct cam_device * +cam_lookup_pass(const char *dev_name, int unit, int flags, + const char *given_path, struct cam_device *device) +{ + int fd; + union ccb ccb; + char dev_path[256]; + char *func_name = "cam_lookup_pass"; + + /* + * The flags argument above only applies to the actual passthrough + * device open, not our open of the given device to find the + * passthrough device. + */ + if ((fd = open(XPT_DEVICE, O_RDWR)) < 0) { + snprintf(cam_errbuf, CAM_ERRBUF_SIZE, + "%s: couldn't open %s\n%s: %s", func_name, XPT_DEVICE, + func_name, strerror(errno)); + return(NULL); + } + + /* This isn't strictly necessary for the GETPASSTHRU ioctl. */ + ccb.ccb_h.func_code = XPT_GDEVLIST; + + /* These two are necessary for the GETPASSTHRU ioctl to work. */ + strlcpy(ccb.cgdl.periph_name, dev_name, sizeof(ccb.cgdl.periph_name)); + ccb.cgdl.unit_number = unit; + + /* + * Attempt to get the passthrough device. This ioctl will fail if + * the device name is null, if the device doesn't exist, or if the + * passthrough driver isn't in the kernel. + */ + if (ioctl(fd, CAMGETPASSTHRU, &ccb) == -1) { + char tmpstr[256]; + + /* + * If we get ENOENT from the transport layer version of + * the CAMGETPASSTHRU ioctl, it means one of two things: + * either the device name/unit number passed in doesn't + * exist, or the passthrough driver isn't in the kernel. + */ + if (errno == ENOENT) { + snprintf(tmpstr, sizeof(tmpstr), + "\n%s: either the pass driver isn't in " + "your kernel\n%s: or %s%d doesn't exist", + func_name, func_name, dev_name, unit); + } + snprintf(cam_errbuf, sizeof(cam_errbuf), + "%s: CAMGETPASSTHRU ioctl failed\n" + "%s: %s%s", func_name, func_name, strerror(errno), + (errno == ENOENT) ? tmpstr : ""); + + close(fd); + return(NULL); + } + + close(fd); + + /* + * If the ioctl returned the right status, but we got an error back + * in the ccb, that means that the kernel found the device the user + * passed in, but was unable to find the passthrough device for + * the device the user gave us. + */ + if (ccb.cgdl.status == CAM_GDEVLIST_ERROR) { + sprintf(cam_errbuf, "%s: device %s%d does not exist!", + func_name, dev_name, unit); + return(NULL); + } + + sprintf(dev_path, "/dev/%s%d", ccb.cgdl.periph_name, + ccb.cgdl.unit_number); + + return(cam_real_open_device(dev_path, flags, device, NULL, + dev_name, unit)); +} + +/* + * Open a given device. The path argument isn't strictly necessary, but it + * is copied into the cam_device structure as a convenience to the user. + */ +static struct cam_device * +cam_real_open_device(const char *path, int flags, struct cam_device *device, + const char *given_path, const char *given_dev_name, + int given_unit_number) +{ + char *func_name = "cam_real_open_device"; + union ccb ccb; + int fd = -1, malloced_device = 0; + + /* + * See if the user wants us to malloc a device for him. + */ + if (device == NULL) { + if ((device = (struct cam_device *)malloc( + sizeof(struct cam_device))) == NULL) { + sprintf(cam_errbuf, "%s: device structure malloc" + " failed\n%s: %s", func_name, func_name, + strerror(errno)); + return(NULL); + } + device->fd = -1; + malloced_device = 1; + } + + /* + * If the user passed in a path, save it for him. + */ + if (given_path != NULL) + strlcpy(device->device_path, given_path, + sizeof(device->device_path)); + else + device->device_path[0] = '\0'; + + /* + * If the user passed in a device name and unit number pair, save + * those as well. + */ + if (given_dev_name != NULL) + strlcpy(device->given_dev_name, given_dev_name, + sizeof(device->given_dev_name)); + else + device->given_dev_name[0] = '\0'; + device->given_unit_number = given_unit_number; + + if ((fd = open(path, flags)) < 0) { + snprintf(cam_errbuf, CAM_ERRBUF_SIZE, + "%s: couldn't open passthrough device %s\n" + "%s: %s", func_name, path, func_name, + strerror(errno)); + goto crod_bailout; + } + + device->fd = fd; + + bzero(&ccb, sizeof(union ccb)); + + /* + * Unlike the transport layer version of the GETPASSTHRU ioctl, + * we don't have to set any fields. + */ + ccb.ccb_h.func_code = XPT_GDEVLIST; + + /* + * We're only doing this to get some information on the device in + * question. Otherwise, we'd have to pass in yet another + * parameter: the passthrough driver unit number. + */ + if (ioctl(fd, CAMGETPASSTHRU, &ccb) == -1) { + /* + * At this point we know the passthrough device must exist + * because we just opened it above. The only way this + * ioctl can fail is if the ccb size is wrong. + */ + sprintf(cam_errbuf, "%s: CAMGETPASSTHRU ioctl failed\n" + "%s: %s", func_name, func_name, strerror(errno)); + goto crod_bailout; + } + + /* + * If the ioctl returned the right status, but we got an error back + * in the ccb, that means that the kernel found the device the user + * passed in, but was unable to find the passthrough device for + * the device the user gave us. + */ + if (ccb.cgdl.status == CAM_GDEVLIST_ERROR) { + sprintf(cam_errbuf, "%s: passthrough device does not exist!", + func_name); + goto crod_bailout; + } + + device->dev_unit_num = ccb.cgdl.unit_number; + strlcpy(device->device_name, ccb.cgdl.periph_name, + sizeof(device->device_name)); + device->path_id = ccb.ccb_h.path_id; + device->target_id = ccb.ccb_h.target_id; + device->target_lun = ccb.ccb_h.target_lun; + + ccb.ccb_h.func_code = XPT_PATH_INQ; + if (ioctl(fd, CAMIOCOMMAND, &ccb) == -1) { + sprintf(cam_errbuf, "%s: Path Inquiry CCB failed\n" + "%s: %s", func_name, func_name, strerror(errno)); + goto crod_bailout; + } + strlcpy(device->sim_name, ccb.cpi.dev_name, sizeof(device->sim_name)); + device->sim_unit_number = ccb.cpi.unit_number; + device->bus_id = ccb.cpi.bus_id; + + /* + * It doesn't really matter what is in the payload for a getdev + * CCB, the kernel doesn't look at it. + */ + ccb.ccb_h.func_code = XPT_GDEV_TYPE; + if (ioctl(fd, CAMIOCOMMAND, &ccb) == -1) { + sprintf(cam_errbuf, "%s: Get Device Type CCB failed\n" + "%s: %s", func_name, func_name, strerror(errno)); + goto crod_bailout; + } + device->pd_type = SID_TYPE(&ccb.cgd.inq_data); + bcopy(&ccb.cgd.inq_data, &device->inq_data, + sizeof(struct scsi_inquiry_data)); + device->serial_num_len = ccb.cgd.serial_num_len; + bcopy(&ccb.cgd.serial_num, &device->serial_num, device->serial_num_len); + + /* + * Zero the payload, the kernel does look at the flags. + */ + bzero(&(&ccb.ccb_h)[1], sizeof(struct ccb_trans_settings)); + + /* + * Get transfer settings for this device. + */ + ccb.ccb_h.func_code = XPT_GET_TRAN_SETTINGS; + + ccb.cts.type = CTS_TYPE_CURRENT_SETTINGS; + + if (ioctl(fd, CAMIOCOMMAND, &ccb) == -1) { + sprintf(cam_errbuf, "%s: Get Transfer Settings CCB failed\n" + "%s: %s", func_name, func_name, strerror(errno)); + goto crod_bailout; + } + if (ccb.cts.protocol == XPORT_SPI) { + struct ccb_trans_settings_spi *spi = + &ccb.cts.xport_specific.spi; + device->sync_period = spi->sync_period; + device->sync_offset = spi->sync_offset; + device->bus_width = spi->bus_width; + } else { + device->sync_period = 0; + device->sync_offset = 0; + device->bus_width = 0; + } + + return(device); + +crod_bailout: + + if (fd >= 0) + close(fd); + + if (malloced_device) + free(device); + + return(NULL); +} + +void +cam_close_device(struct cam_device *dev) +{ + if (dev == NULL) + return; + + cam_close_spec_device(dev); + + free(dev); +} + +void +cam_close_spec_device(struct cam_device *dev) +{ + if (dev == NULL) + return; + + if (dev->fd >= 0) + close(dev->fd); +} + +char * +cam_path_string(struct cam_device *dev, char *str, int len) +{ + if (dev == NULL) { + snprintf(str, len, "No path"); + return(str); + } + + snprintf(str, len, "(%s%d:%s%d:%d:%d:%d): ", + (dev->device_name[0] != '\0') ? dev->device_name : "pass", + dev->dev_unit_num, + (dev->sim_name[0] != '\0') ? dev->sim_name : "unknown", + dev->sim_unit_number, + dev->bus_id, + dev->target_id, + dev->target_lun); + + return(str); +} + +/* + * Malloc/duplicate a CAM device structure. + */ +struct cam_device * +cam_device_dup(struct cam_device *device) +{ + char *func_name = "cam_device_dup"; + struct cam_device *newdev; + + if (device == NULL) { + sprintf(cam_errbuf, "%s: device is NULL", func_name); + return(NULL); + } + + newdev = malloc(sizeof(struct cam_device)); + if (newdev == NULL) { + snprintf(cam_errbuf, CAM_ERRBUF_SIZE, + "%s: couldn't malloc CAM device structure", func_name); + return(NULL); + } + + bcopy(device, newdev, sizeof(struct cam_device)); + + return(newdev); +} + +/* + * Copy a CAM device structure. + */ +void +cam_device_copy(struct cam_device *src, struct cam_device *dst) +{ + char *func_name = "cam_device_copy"; + + if (src == NULL) { + sprintf(cam_errbuf, "%s: source device struct was NULL", + func_name); + return; + } + + if (dst == NULL) { + sprintf(cam_errbuf, "%s: destination device struct was NULL", + func_name); + return; + } + + bcopy(src, dst, sizeof(struct cam_device)); + +} |
