int verify_set_agheader(xfs_mount_t *mp, xfs_buf_t *sbuf, xfs_sb_t *sb, xfs_agf_t *agf, xfs_agi_t *agi, xfs_agnumber_t i) { int rval = 0; int status = XR_OK; int status_sb = XR_OK; status = verify_sb(sb, (i == 0)); if (status != XR_OK) { do_warn(_("bad on-disk superblock %d - %s\n"), i, err_string(status)); } status_sb = compare_sb(mp, sb); if (status_sb != XR_OK) { do_warn(_("primary/secondary superblock %d conflict - %s\n"), i, err_string(status_sb)); } if (status != XR_OK || status_sb != XR_OK) { if (!no_modify) { *sb = mp->m_sb; /* * clear the more transient fields */ sb->sb_inprogress = 1; sb->sb_icount = 0; sb->sb_ifree = 0; sb->sb_fdblocks = 0; sb->sb_frextents = 0; sb->sb_qflags = 0; } rval |= XR_AG_SB; } rval |= secondary_sb_wack(mp, sbuf, sb, i); rval |= verify_set_agf(mp, agf, i); rval |= verify_set_agi(mp, agi, i); return(rval); }
/* * get a possible superblock -- don't check for internal consistency */ int get_sb(xfs_sb_t *sbp, xfs_off_t off, int size, xfs_agnumber_t agno) { int error, rval; xfs_dsb_t *buf; buf = memalign(libxfs_device_alignment(), size); if (buf == NULL) { do_error( _("error reading superblock %u -- failed to memalign buffer\n"), agno); exit(1); } memset(buf, 0, size); /* try and read it first */ if (lseek64(x.dfd, off, SEEK_SET) != off) { do_warn( _("error reading superblock %u -- seek to offset %" PRId64 " failed\n"), agno, off); return(XR_EOF); } if ((rval = read(x.dfd, buf, size)) != size) { error = errno; do_warn( _("superblock read failed, offset %" PRId64 ", size %d, ag %u, rval %d\n"), off, size, agno, rval); do_error("%s\n", strerror(error)); } libxfs_sb_from_disk(sbp, buf); free(buf); return (verify_sb(sbp, 0)); }
/* * find a secondary superblock, copy it into the sb buffer */ int find_secondary_sb(xfs_sb_t *rsb) { xfs_off_t off; xfs_sb_t *sb; xfs_sb_t bufsb; char *c_bufsb; int done; int i; int dirty; int retval; int bsize; do_warn(_("\nattempting to find secondary superblock...\n")); sb = (xfs_sb_t *)memalign(libxfs_device_alignment(), BSIZE); if (!sb) { do_error( _("error finding secondary superblock -- failed to memalign buffer\n")); exit(1); } memset(&bufsb, 0, sizeof(xfs_sb_t)); retval = 0; dirty = 0; bsize = 0; /* * skip first sector since we know that's bad */ for (done = 0, off = XFS_AG_MIN_BYTES; !done ; off += bsize) { /* * read disk 1 MByte at a time. */ if (lseek64(x.dfd, off, SEEK_SET) != off) { done = 1; } if (!done && (bsize = read(x.dfd, sb, BSIZE)) <= 0) { done = 1; } do_warn("."); /* * check the buffer 512 bytes at a time since * we don't know how big the sectors really are. */ for (i = 0; !done && i < bsize; i += BBSIZE) { c_bufsb = (char *)sb + i; libxfs_sb_from_disk(&bufsb, (xfs_dsb_t *)c_bufsb); if (verify_sb(&bufsb, 0) != XR_OK) continue; do_warn(_("found candidate secondary superblock...\n")); /* * found one. now verify it by looking * for other secondaries. */ memmove(rsb, &bufsb, sizeof(xfs_sb_t)); rsb->sb_inprogress = 0; clear_sunit = 1; if (verify_set_primary_sb(rsb, 0, &dirty) == XR_OK) { do_warn( _("verified secondary superblock...\n")); done = 1; retval = 1; } else { do_warn( _("unable to verify superblock, continuing...\n")); } } } free(sb); return(retval); }
/* * the way to verify that a primary sb is consistent with the * filesystem is find the secondaries given the info in the * primary and compare the geometries in the secondaries against * the geometry indicated by the primary. * * returns 1 if bad, 0 if ok */ int verify_set_primary_sb(xfs_sb_t *rsb, int sb_index, int *sb_modified) { xfs_off_t off; fs_geometry_t geo; xfs_sb_t *sb; fs_geo_list_t *list; fs_geo_list_t *current; char *checked; xfs_agnumber_t agno; int num_sbs; int skip; int size; int num_ok; int retval; int round; /* * select the number of secondaries to try for */ num_sbs = MIN(NUM_SBS, rsb->sb_agcount); skip = howmany(num_sbs, rsb->sb_agcount); /* * We haven't been able to validate the sector size yet properly * (e.g. in the case of repairing an image in a file), so we need to * take into account sector mismatches and so use the maximum possible * sector size rather than the sector size in @rsb. */ size = NUM_AGH_SECTS * (1 << (XFS_MAX_SECTORSIZE_LOG)); retval = 0; list = NULL; num_ok = 0; *sb_modified = 0; sb = (xfs_sb_t *) alloc_ag_buf(size); checked = calloc(rsb->sb_agcount, sizeof(char)); if (!checked) { do_error(_("calloc failed in verify_set_primary_sb\n")); exit(1); } /* * put the primary sb geometry info onto the geometry list */ checked[sb_index] = 1; get_sb_geometry(&geo, rsb); list = add_geo(list, &geo, sb_index); /* * grab N secondaries. check them off as we get them * so we only process each one once */ for (round = 0; round < skip; round++) { for (agno = round; agno < rsb->sb_agcount; agno += skip) { if (checked[agno]) continue; off = (xfs_off_t)agno * rsb->sb_agblocks << rsb->sb_blocklog; checked[agno] = 1; if (get_sb(sb, off, size, agno) == XR_EOF) { retval = 1; goto out; } if (verify_sb(sb, 0) == XR_OK) { /* * save away geometry info. * don't bother checking the sb * against the agi/agf as the odds * of the sb being corrupted in a way * that it is internally consistent * but not consistent with the rest * of the filesystem is really really low. */ get_sb_geometry(&geo, sb); list = add_geo(list, &geo, agno); num_ok++; } } } /* * see if we have enough superblocks to bother with */ if (num_ok < num_sbs / 2) return(XR_INSUFF_SEC_SB); current = get_best_geo(list); /* * check that enough sbs agree that we're willing to * go with this geometry. if not, print out the * geometry and a message about the force option. */ switch (num_sbs) { case 2: /* * If we only have two allocation groups, and the superblock * in the second allocation group differs from the primary * superblock we can't verify the geometry information. * Warn the user about this situation and get out unless * explicitly overridden. */ if (current->refs != 2) { if (!force_geo) { do_warn( _("Only two AGs detected and they do not match - " "cannot validate filesystem geometry.\n" "Use the -o force_geometry option to proceed.\n")); exit(1); } } goto out_free_list; case 1: /* * If we only have a single allocation group there is no * secondary superblock that we can use to verify the geometry * information. Warn the user about this situation and get * out unless explicitly overridden. */ if (!force_geo) { do_warn( _("Only one AG detected - " "cannot validate filesystem geometry.\n" "Use the -o force_geometry option to proceed.\n")); exit(1); } goto out_free_list; default: /* * at least half of the probed superblocks have * to agree. if they don't, this fs is probably * too far gone anyway considering the fact that * XFS normally doesn't alter the secondary superblocks. */ if (current->refs < num_sbs / 2) { do_warn( _("Not enough matching superblocks - cannot proceed.\n")); exit(1); } } /* * set the geometry into primary superblock if necessary. */ if (current->index != sb_index) { *sb_modified = 1; off = (xfs_off_t)current->index * current->geo.sb_agblocks * current->geo.sb_blocksize; if (get_sb(sb, off, current->geo.sb_sectsize, current->index) != XR_OK) do_error(_("could not read superblock\n")); copy_sb(sb, rsb); /* * turn off inprogress bit since this is the primary. * also save away values that we need to ensure are * consistent in the other secondaries. */ rsb->sb_inprogress = 0; sb_inoalignmt = sb->sb_inoalignmt; sb_unit = sb->sb_unit; sb_width = sb->sb_width; } out_free_list: free_geo(list); out: free(sb); free(checked); return(retval); }
/* ARGSUSED */ void phase1(xfs_mount_t *mp) { xfs_sb_t *sb; char *ag_bp; int rval; do_log(_("Phase 1 - find and verify superblock...\n")); primary_sb_modified = 0; need_root_inode = 0; need_root_dotdot = 0; need_rbmino = 0; need_rsumino = 0; lost_quotas = 0; /* * get AG 0 into ag header buf */ ag_bp = alloc_ag_buf(MAX_SECTSIZE); sb = (xfs_sb_t *) ag_bp; if (get_sb(sb, 0LL, MAX_SECTSIZE, 0) == XR_EOF) do_error(_("error reading primary superblock\n")); /* * is this really an sb, verify internal consistency */ if ((rval = verify_sb(sb, 1)) != XR_OK) { do_warn(_("bad primary superblock - %s !!!\n"), err_string(rval)); if (!find_secondary_sb(sb)) no_sb(); primary_sb_modified = 1; } else if ((rval = verify_set_primary_sb(sb, 0, &primary_sb_modified)) != XR_OK) { do_warn(_("couldn't verify primary superblock - %s !!!\n"), err_string(rval)); if (!find_secondary_sb(sb)) no_sb(); primary_sb_modified = 1; } /* * Check bad_features2 and make sure features2 the same as * bad_features (ORing the two together). Leave bad_features2 * set so older kernels can still use it and not mount unsupported * filesystems when it reads bad_features2. */ if (sb->sb_bad_features2 != 0 && sb->sb_bad_features2 != sb->sb_features2) { sb->sb_features2 |= sb->sb_bad_features2; sb->sb_bad_features2 = sb->sb_features2; primary_sb_modified = 1; do_warn(_("superblock has a features2 mismatch, correcting\n")); } /* * apply any version changes or conversions after the primary * superblock has been verified or repaired * * Send output to stdout as do_log and everything else in repair * is sent to stderr and there is no "quiet" option. xfs_admin * will filter stderr but not stdout. This situation must be improved. */ if (convert_lazy_count) { if (lazy_count && !xfs_sb_version_haslazysbcount(sb)) { sb->sb_versionnum |= XFS_SB_VERSION_MOREBITSBIT; sb->sb_features2 |= XFS_SB_VERSION2_LAZYSBCOUNTBIT; sb->sb_bad_features2 |= XFS_SB_VERSION2_LAZYSBCOUNTBIT; primary_sb_modified = 1; printf(_("Enabling lazy-counters\n")); } else if (!lazy_count && xfs_sb_version_haslazysbcount(sb)) { sb->sb_features2 &= ~XFS_SB_VERSION2_LAZYSBCOUNTBIT; sb->sb_bad_features2 &= ~XFS_SB_VERSION2_LAZYSBCOUNTBIT; printf(_("Disabling lazy-counters\n")); primary_sb_modified = 1; } else { printf(_("Lazy-counters are already %s\n"), lazy_count ? _("enabled") : _("disabled")); exit(0); /* no conversion required, exit */ } } if (primary_sb_modified) { if (!no_modify) { do_warn(_("writing modified primary superblock\n")); write_primary_sb(sb, sb->sb_sectsize); } else { do_warn(_("would write modified primary superblock\n")); } } /* * misc. global var initialization */ sb_ifree = sb_icount = sb_fdblocks = sb_frextents = 0; free(sb); }