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- /*
- * Copyright (c) 2008-2011 Willem Dijkstra
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * - Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * - 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 COPYRIGHT HOLDERS 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
- * COPYRIGHT HOLDERS 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/ioctl.h>
- #include <sys/stat.h>
- #include <sys/types.h>
- #include <errno.h>
- #include <fcntl.h>
- #include <strings.h>
- #include <string.h>
- #include <stdlib.h>
- #include <linux/hdreg.h>
- #include "conf.h"
- #include "data.h"
- #include "error.h"
- #include "xmalloc.h"
- #include "smart.h"
- #ifndef HAS_HDDRIVECMDHDR
- typedef unsigned char task_ioreg_t;
- struct hd_drive_cmd_hdr {
- task_ioreg_t command;
- task_ioreg_t sector_number;
- task_ioreg_t feature;
- task_ioreg_t sector_count;
- };
- #endif
- /* Ata command register set for requesting smart values */
- static struct hd_drive_cmd_hdr smart_cmd = {
- WIN_SMART, /* command code */
- 0, /* sector number */
- SMART_READ_VALUES, /* feature */
- 1 /* sector count */
- };
- /* Per drive storage structure; the ata cmd is followed by the data buffer that
- * is filled by the ioctl. There can be no room between the two; hence the
- * pragma for byte alignment.
- */
- #pragma pack(1)
- struct smart_device {
- struct hd_drive_cmd_hdr cmd;
- struct smart_values data;
- char name[MAX_PATH_LEN];
- int fd;
- int type;
- int failed;
- };
- #pragma pack()
- static struct smart_device *smart_devs = NULL;
- static int smart_cur = 0;
- void
- init_smart(struct stream *st)
- {
- int i;
- char drivename[MAX_PATH_LEN];
- if (sizeof(struct smart_values) != DISK_BLOCK_LEN) {
- fatal("smart: internal error: smart values structure is broken");
- }
- if (st->arg == NULL)
- fatal("smart: need a <disk device|name> argument");
- if ((diskbyname(st->arg, drivename, sizeof(drivename)) == 0))
- fatal("smart: '%.200s' is not a disk device", st->arg);
- /* look for drive in our global table */
- for (i = 0; i < smart_cur; i++) {
- if (strncmp(smart_devs[i].name, drivename, sizeof(drivename)) == 0) {
- st->parg.smart = i;
- return;
- }
- }
- /* this is a new drive; allocate the command and data block */
- if (smart_cur > SYMON_MAX_DOBJECTS) {
- fatal("%s:%d: dynamic object limit (%d) exceeded for smart data",
- __FILE__, __LINE__, SYMON_MAX_DOBJECTS);
- }
- smart_devs = xrealloc(smart_devs, (smart_cur + 1) * sizeof(struct smart_device));
- bzero(&smart_devs[smart_cur], sizeof(struct smart_device));
- /* store drivename in new block */
- strlcpy(smart_devs[smart_cur].name, drivename, sizeof(smart_devs[0].name));
- /* store filedescriptor to device */
- if ((smart_devs[smart_cur].fd = open(drivename, O_RDONLY | O_NONBLOCK)) < 0)
- fatal("smart: could not open '%.200s' for read: %.200s", drivename, strerror(errno));
- /* store smart dev entry in stream to facilitate quick get */
- st->parg.smart = smart_cur;
- smart_cur++;
- info("started module smart(%.200s = %.200s)", st->arg, smart_devs[st->parg.smart].name);
- }
- void
- gets_smart()
- {
- int i;
- for (i = 0; i < smart_cur; i++) {
- /* populate ata command header */
- memcpy(&smart_devs[i].cmd, (void *) &smart_cmd, sizeof(struct hd_drive_cmd_hdr));
- if (ioctl(smart_devs[i].fd, HDIO_DRIVE_CMD, &smart_devs[i].cmd)) {
- warning("smart: ioctl for drive '%s' failed: %d",
- &smart_devs[i].name, errno);
- smart_devs[i].failed = 1;
- }
- /* Linux does not allow checking the smart return code using the
- * HDIO_DRIVE_CMD */
- /* Some drives do not calculate the smart checksum correctly;
- * additional code that identifies these drives would increase our
- * footprint and the amount of datajuggling we need to do; we would
- * rather ignore the checksums.
- */
- smart_devs[i].failed = 0;
- }
- return;
- }
- int
- get_smart(char *symon_buf, int maxlen, struct stream *st)
- {
- struct smart_report sr;
- if ((st->parg.smart < smart_cur) &&
- (!smart_devs[st->parg.smart].failed))
- {
- smart_parse(&smart_devs[st->parg.smart].data, &sr);
- return snpack(symon_buf, maxlen, st->arg, MT_SMART,
- sr.read_error_rate,
- sr.reallocated_sectors,
- sr.spin_retries,
- sr.air_flow_temp,
- sr.temperature,
- sr.reallocations,
- sr.current_pending,
- sr.uncorrectables,
- sr.soft_read_error_rate,
- sr.g_sense_error_rate,
- sr.temperature2,
- sr.free_fall_protection);
- }
- return 0;
- }
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