--- /dev/null
+/*
+ * superblocks.c - reads information from filesystem and raid superblocks
+ *
+ * Copyright (C) 2008-2009 Karel Zak <kzak@redhat.com>
+ *
+ * This file may be redistributed under the terms of the
+ * GNU Lesser General Public License.
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <ctype.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <errno.h>
+#include <stdint.h>
+#include <stdarg.h>
+
+#include "blkdev.h"
+#include "blkidP.h"
+
+#include "superblocks.h"
+
+/**
+ * SECTION:superblocks
+ * @title: Superblocks probing
+ * @short_description: filesystems and raids superblocks probing.
+ *
+ * The library API has been originaly designed for superblocks probing only.
+ * This is reason why some *deprecated* superblock specific functions don't use
+ * '_superblocks_' namespace in the function name. Please, don't use these
+ * functions in new code.
+ *
+ * The 'superblocks' probers support NAME=value (tags) interface only. The
+ * superblocks probing is enabled by default (and controled by
+ * blkid_probe_enable_superblocks()).
+ *
+ * Currently supported tags:
+ *
+ * @TYPE: filesystem type
+ *
+ * @SEC_TYPE: secondary filesystem type
+ *
+ * @LABEL: filesystem label
+ *
+ * @LABEL_RAW: raw label from FS superblock
+ *
+ * @UUID: filesystem UUID (lower case)
+ *
+ * @UUID_RAW: raw UUID from FS superblock
+ *
+ * @EXT_JOURNAL: external journal UUID
+ *
+ * @USAGE: usage string: "raid", "filesystem", ...
+ *
+ * @VERSION: filesystem version
+ *
+ * @MOUNT: cluster mount name (?) -- ocfs only
+ *
+ * @SBMAGIC: super block magic string [not-implemented yet]
+ *
+ * @SBOFFSET: offset of superblock [not-implemented yet]
+ *
+ * @FSSIZE: size of filessystem [not-implemented yet]
+ */
+
+static int superblocks_probe(blkid_probe pr, struct blkid_chain *chn);
+static int superblocks_safeprobe(blkid_probe pr, struct blkid_chain *chn);
+
+static int blkid_probe_set_usage(blkid_probe pr, int usage);
+
+
+/*
+ * Superblocks chains probing functions
+ */
+static const struct blkid_idinfo *idinfos[] =
+{
+ /* RAIDs */
+ &linuxraid_idinfo,
+ &ddfraid_idinfo,
+ &iswraid_idinfo,
+ &lsiraid_idinfo,
+ &viaraid_idinfo,
+ &silraid_idinfo,
+ &nvraid_idinfo,
+ &pdcraid_idinfo,
+ &highpoint45x_idinfo,
+ &highpoint37x_idinfo,
+ &adraid_idinfo,
+ &jmraid_idinfo,
+ &lvm2_idinfo,
+ &lvm1_idinfo,
+ &snapcow_idinfo,
+ &luks_idinfo,
+
+ /* Filesystems */
+ &vfat_idinfo,
+ &swsuspend_idinfo,
+ &swap_idinfo,
+ &xfs_idinfo,
+ &ext4dev_idinfo,
+ &ext4_idinfo,
+ &ext3_idinfo,
+ &ext2_idinfo,
+ &jbd_idinfo,
+ &reiser_idinfo,
+ &reiser4_idinfo,
+ &jfs_idinfo,
+ &udf_idinfo,
+ &iso9660_idinfo,
+ &zfs_idinfo,
+ &hfsplus_idinfo,
+ &hfs_idinfo,
+ &ufs_idinfo,
+ &hpfs_idinfo,
+ &sysv_idinfo,
+ &xenix_idinfo,
+ &ntfs_idinfo,
+ &cramfs_idinfo,
+ &romfs_idinfo,
+ &minix_idinfo,
+ &gfs_idinfo,
+ &gfs2_idinfo,
+ &ocfs_idinfo,
+ &ocfs2_idinfo,
+ &oracleasm_idinfo,
+ &vxfs_idinfo,
+ &squashfs_idinfo,
+ &netware_idinfo,
+ &btrfs_idinfo
+};
+
+/*
+ * Driver definition
+ */
+const struct blkid_chaindrv superblocks_drv = {
+ .id = BLKID_CHAIN_SUBLKS,
+ .name = "superblocks",
+ .dflt_enabled = TRUE,
+ .dflt_flags = BLKID_SUBLKS_DEFAULT,
+ .idinfos = idinfos,
+ .nidinfos = ARRAY_SIZE(idinfos),
+ .has_fltr = TRUE,
+ .probe = superblocks_probe,
+ .safeprobe = superblocks_safeprobe
+};
+
+
+/*
+ * The blkid_do_probe() backend.
+ */
+static int superblocks_probe(blkid_probe pr, struct blkid_chain *chn)
+{
+ int i = 0;
+
+ if (!pr || chn->idx < -1)
+ return -1;
+ if (chn->idx < -1)
+ return -1;
+ blkid_probe_chain_reset_vals(pr, chn);
+
+ DBG(DEBUG_LOWPROBE,
+ printf("--> starting probing loop [SUBLKS idx=%d]\n",
+ chn->idx));
+
+ i = chn->idx + 1;
+
+ for ( ; i < ARRAY_SIZE(idinfos); i++) {
+ const struct blkid_idinfo *id;
+ const struct blkid_idmag *mag;
+ int hasmag = 0;
+
+ chn->idx = i;
+
+ if (chn->fltr && blkid_bmp_get_item(chn->fltr, i))
+ continue;
+
+ id = idinfos[i];
+ mag = id->magics ? &id->magics[0] : NULL;
+
+ /* try to detect by magic string */
+ while(mag && mag->magic) {
+ blkid_loff_t off;
+ unsigned char *buf;
+
+ off = mag->kboff + ((blkid_loff_t) mag->sboff >> 10);
+ buf = blkid_probe_get_buffer(pr, off << 10, 1024);
+
+ if (buf && !memcmp(mag->magic,
+ buf + (mag->sboff & 0x3ff), mag->len)) {
+ DBG(DEBUG_LOWPROBE, printf(
+ "%s: magic sboff=%u, kboff=%ld\n",
+ id->name, mag->sboff, mag->kboff));
+ hasmag = 1;
+ break;
+ }
+ mag++;
+ }
+
+ if (hasmag == 0 && id->magics && id->magics[0].magic)
+ /* magic string(s) defined, but not found */
+ continue;
+
+ /* final check by probing function */
+ if (id->probefunc) {
+ DBG(DEBUG_LOWPROBE, printf(
+ "%s: call probefunc()\n", id->name));
+ if (id->probefunc(pr, mag) != 0)
+ continue;
+ }
+
+ /* all cheks passed */
+ if (chn->flags & BLKID_SUBLKS_TYPE)
+ blkid_probe_set_value(pr, "TYPE",
+ (unsigned char *) id->name,
+ strlen(id->name) + 1);
+ if (chn->flags & BLKID_SUBLKS_USAGE)
+ blkid_probe_set_usage(pr, id->usage);
+
+ DBG(DEBUG_LOWPROBE,
+ printf("<-- leaving probing loop (type=%s) [SUBLKS idx=%d]\n",
+ id->name, chn->idx));
+ return 0;
+ }
+ DBG(DEBUG_LOWPROBE,
+ printf("<-- leaving probing loop (failed) [SUBLKS idx=%d]\n",
+ chn->idx));
+ return 1;
+}
+
+/*
+ * This is the same function as blkid_do_probe(), but returns only one result
+ * (cannot be used in while()) and checks for ambivalen results (more
+ * filesystems on the device) -- in such case returns -2.
+ *
+ * The function does not check for filesystems when a RAID signature is
+ * detected. The function also does not check for collision between RAIDs. The
+ * first detected RAID is returned.
+ */
+static int superblocks_safeprobe(blkid_probe pr, struct blkid_chain *chn)
+{
+ struct blkid_prval vals[BLKID_NVALS_SUBLKS];
+ int nvals = BLKID_NVALS_SUBLKS;
+ int idx = -1;
+ int count = 0;
+ int intol = 0;
+ int rc;
+
+ while ((rc = superblocks_probe(pr, chn)) == 0) {
+ if (!count) {
+ /* save the first result */
+ nvals = blkid_probe_chain_copy_vals(pr, chn, vals, nvals);
+ idx = chn->idx;
+ }
+ count++;
+
+ if (idinfos[chn->idx]->usage & BLKID_USAGE_RAID)
+ break;
+ if (!(idinfos[chn->idx]->flags & BLKID_IDINFO_TOLERANT))
+ intol++;
+ }
+ if (rc < 0)
+ return rc; /* error */
+ if (count > 1 && intol) {
+ DBG(DEBUG_LOWPROBE,
+ printf("ERROR: superblocks chain: "
+ "ambivalent result detected (%d filesystems)!\n",
+ count));
+ return -2; /* error, ambivalent result (more FS) */
+ }
+ if (!count)
+ return 1; /* nothing detected */
+
+ /* restore the first result */
+ blkid_probe_chain_reset_vals(pr, chn);
+ blkid_probe_append_vals(pr, vals, nvals);
+ chn->idx = idx;
+
+ return 0;
+}
+
+static int blkid_probe_set_usage(blkid_probe pr, int usage)
+{
+ char *u = NULL;
+
+ if (usage & BLKID_USAGE_FILESYSTEM)
+ u = "filesystem";
+ else if (usage & BLKID_USAGE_RAID)
+ u = "raid";
+ else if (usage & BLKID_USAGE_CRYPTO)
+ u = "crypto";
+ else if (usage & BLKID_USAGE_OTHER)
+ u = "other";
+ else
+ u = "unknown";
+
+ return blkid_probe_set_value(pr, "USAGE", (unsigned char *) u, strlen(u) + 1);
+}
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