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vtllibrary: To report correct media type - a helper added
get_cart_type() is a cut-down version from vtlcart.c Just enough to read the MAM information from the meta file and return the correct media type. This will result in open()/close() of each meta file on a robot initialisation Signed-off-by: Mark Harvey <markh794@gmail.com>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,195 @@ | ||
| /* | ||
| * Version 2 of tape format. | ||
| * | ||
| * Each media contains 3 files. | ||
| * - The .data file contains each block of data written to the media | ||
| * - The .indx file consists of an array of one raw_header structure per | ||
| * written tape block or filemark. | ||
| * - The .meta file consists of a MAM structure followed by a meta_header | ||
| * structure, followed by a variable-length array of filemark block numbers. | ||
| * | ||
| * Copyright (C) 2009 - 2010 Kevan Rehm | ||
| * | ||
| * This is a vtllibrary 'helper'. This contains a function to open the media | ||
| * metadata file and return the media type (Data, WORM, Cleaning etc) | ||
| * Required to fill in details of READ ELEMENT STATUS - instead of just gussing | ||
| * based on barcode, open the actual media metadata and read 'from the horses | ||
| * mouth' | ||
| * This program is free software; you can redistribute it and/or modify | ||
| * it under the terms of the GNU General Public License as published by | ||
| * the Free Software Foundation; either version 2 of the License, or | ||
| * (at your option) any later version. | ||
| * | ||
| * This program is distributed in the hope that it will be useful, | ||
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| * GNU General Public License for more details. | ||
| * | ||
| * You should have received a copy of the GNU General Public License | ||
| * along with this program; if not, write to the Free Software | ||
| * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | ||
| */ | ||
|
|
||
| #define _FILE_OFFSET_BITS 64 | ||
|
|
||
| #define __STDC_FORMAT_MACROS /* for PRId64 */ | ||
|
|
||
| /* for unistd.h pread/pwrite and fcntl.h posix_fadvise */ | ||
| #define _XOPEN_SOURCE 600 | ||
|
|
||
| #include <sys/stat.h> | ||
| #include <sys/types.h> | ||
| #include <errno.h> | ||
| #include <fcntl.h> | ||
| #include <stdio.h> | ||
| #include <stdlib.h> | ||
| #include <string.h> | ||
| #include <unistd.h> | ||
|
|
||
| #include "logging.h" | ||
| #include "list.h" | ||
| #include "vtltape.h" | ||
|
|
||
| /* The .meta file consists of a MAM structure followed by a meta_header | ||
| structure, followed by a variable-length array of filemark block numbers. | ||
| Both the MAM and meta_header structures also contain padding to allow | ||
| for future expansion with backwards compatibility. | ||
| */ | ||
|
|
||
| struct meta_header { | ||
| uint32_t filemark_count; | ||
| char pad[512 - sizeof(uint32_t)]; | ||
| }; | ||
|
|
||
| static char currentPCL[1024]; | ||
| static struct meta_header meta; | ||
|
|
||
| static char home_directory[HOME_DIR_PATH_SZ + 1]; | ||
|
|
||
| /* | ||
| * Attempt to open PCL metadata and read cart type | ||
| * | ||
| * Returns valid SMC media type values (READ ELEMENT STATUS): | ||
| * == 0 -> open failed or unknown cart type | ||
| * == 1 -> Data Cart type | ||
| * == 2 -> Cleaning | ||
| * == 3 -> Diagnostics | ||
| * == 4 -> WORM | ||
| * | ||
| * == 5 -> NULL media type (SMC specifies values > 4 as 'reserved') | ||
| */ | ||
|
|
||
| void update_home_dir(long lib_id) | ||
| { | ||
| if (strlen(home_directory) < 2) { | ||
| find_media_home_directory(home_directory, lib_id); | ||
| MHVTL_DBG(3, "Setting home dir to %s", home_directory); | ||
| } | ||
| } | ||
|
|
||
| int get_cart_type(const char *barcode) | ||
| { | ||
| char pcl_meta[1024]; | ||
| char pcl[MAX_BARCODE_LEN + 1]; | ||
| struct stat meta_stat; | ||
| uint64_t exp_size; | ||
| loff_t nread; | ||
| int rc = 0; | ||
| int i; | ||
| int metafile; | ||
| struct MAM tmp_mam; | ||
|
|
||
| /* copy barcode to &pcl and terminate at either ' ' or '\0' */ | ||
| for (i = 0; i < MAX_BARCODE_LEN; i++) { | ||
| pcl[i] = barcode[i]; | ||
| if (pcl[i] == ' ' || pcl[i] == '\0') { | ||
| pcl[i] = '\0'; | ||
| break; | ||
| } | ||
| } | ||
|
|
||
| if (strlen(home_directory)) | ||
| snprintf(currentPCL, ARRAY_SIZE(currentPCL), "%s/%s", | ||
| home_directory, pcl); | ||
| else | ||
| snprintf(currentPCL, ARRAY_SIZE(currentPCL), "%s/%s", | ||
| MHVTL_HOME_PATH, pcl); | ||
|
|
||
| snprintf(pcl_meta, ARRAY_SIZE(pcl_meta), "%s/meta", currentPCL); | ||
|
|
||
| if (stat(pcl_meta, &meta_stat) == -1) { | ||
| MHVTL_DBG(2, "Couldn't find %s, trying previous default: %s/%s", | ||
| pcl_meta, MHVTL_HOME_PATH, pcl); | ||
| snprintf(currentPCL, ARRAY_SIZE(currentPCL), "%s/%s", | ||
| MHVTL_HOME_PATH, pcl); | ||
| snprintf(pcl_meta, ARRAY_SIZE(pcl_meta), "%s/meta", currentPCL); | ||
| } | ||
|
|
||
| metafile = open(pcl_meta, O_RDONLY); | ||
| if (metafile == -1) { | ||
| MHVTL_ERR("open of pcl %s file %s failed, %s", pcl, | ||
| pcl_meta, strerror(errno)); | ||
| rc = 0; | ||
| goto failed; | ||
| } | ||
|
|
||
| if (fstat(metafile, &meta_stat) < 0) { | ||
| MHVTL_ERR("stat of pcl %s file %s failed: %s", pcl, | ||
| pcl_meta, strerror(errno)); | ||
| rc = 0; | ||
| goto failed; | ||
| } | ||
|
|
||
| /* Verify that the metafile size is at least reasonable. */ | ||
|
|
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| exp_size = sizeof(tmp_mam) + sizeof(meta); | ||
| if ((uint32_t)meta_stat.st_size < exp_size) { | ||
| MHVTL_ERR("pcl %s file %s is not the correct length, " | ||
| "expected at least %" PRId64 ", actual %" PRId64, | ||
| pcl, pcl_meta, exp_size, meta_stat.st_size); | ||
| rc = 0; | ||
| goto failed; | ||
| } | ||
|
|
||
| /* Read in the MAM and sanity-check it. */ | ||
| nread = read(metafile, &tmp_mam, sizeof(tmp_mam)); | ||
| if (nread < 0) { | ||
| MHVTL_ERR("Error reading pcl %s MAM from metafile: %s", | ||
| pcl, strerror(errno)); | ||
| rc = 0; | ||
| goto failed; | ||
| } else if (nread != sizeof(tmp_mam)) { | ||
| MHVTL_ERR("Error reading pcl %s MAM from metafile: " | ||
| "unexpected read length", pcl); | ||
| rc = 0; | ||
| goto failed; | ||
| } | ||
|
|
||
| switch (tmp_mam.MediumType) { | ||
| case MEDIA_TYPE_NULL: | ||
| rc = 5; /* Reserved */ | ||
| break; | ||
| case MEDIA_TYPE_DATA: | ||
| rc = 1; | ||
| break; | ||
| case MEDIA_TYPE_CLEAN: | ||
| rc = 2; | ||
| break; | ||
| case MEDIA_TYPE_DIAGNOSTIC: | ||
| rc = 3; | ||
| break; | ||
| case MEDIA_TYPE_WORM: | ||
| rc = 4; | ||
| break; | ||
| default: | ||
| rc = 0; | ||
| break; | ||
| } | ||
|
|
||
| failed: | ||
| close(metafile); | ||
| MHVTL_DBG(3, "Opening media: %s (barcode %s), returning type %d", | ||
| currentPCL, barcode, rc); | ||
| return rc; | ||
| } |
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