/*- * SPDX-License-Identifier: BSD-2-Clause-FreeBSD * * Copyright (c) 2002, 2003 Gordon Tetlow * Copyright (c) 2006 Pawel Jakub Dawidek * 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. 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 AUTHORS 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 AUTHORS 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 __FBSDID("$FreeBSD$"); #include #include #include #include #include #include #include #include #include #include #include #include #include #define G_LABEL_UFS_VOLUME 0 #define G_LABEL_UFS_ID 1 /* * G_LABEL_UFS_CMP returns true if difference between provider mediasize * and filesystem size is less than G_LABEL_UFS_MAXDIFF sectors */ #define G_LABEL_UFS_CMP(prov, fsys, size) \ ( abs( ((fsys)->size) - ( (prov)->mediasize / (fsys)->fs_fsize )) \ < G_LABEL_UFS_MAXDIFF ) #define G_LABEL_UFS_MAXDIFF 0x100 /* * For providers that look like disklabels we need to check if the file system * size is almost equal to the provider's size, because sysinstall(8) used to * bogusly put the first partition at offset 0 instead of 16, and glabel/ufs * would find a file system on the slice instead of the partition. * * In addition, media size can be a bit bigger than file system size. For * instance, mkuzip can append bytes to align data to large sector size (it * improves compression rates). */ static bool g_label_ufs_ignore_bsdlabel_slice(struct g_consumer *cp, struct fs *fs) { struct g_provider *pp; u_char *buf; uint32_t magic1, magic2; int error; pp = cp->provider; /* * If the expected provider size for the filesystem matches the * real provider size then don't ignore this filesystem. */ if (G_LABEL_UFS_CMP(pp, fs, fs_providersize)) return (false); /* * If the filesystem size matches the real provider size then * don't ignore this filesystem. */ if (fs->fs_magic == FS_UFS1_MAGIC ? G_LABEL_UFS_CMP(pp, fs, fs_old_size) : G_LABEL_UFS_CMP(pp, fs, fs_size)) return (false); /* * Provider is bigger than expected; probe to see if there's a * disklabel. Adapted from g_part_bsd_probe. */ /* Check if the superblock overlaps where the disklabel lives. */ if (fs->fs_sblockloc < pp->sectorsize * 2) return (false); /* Sanity-check the provider. */ if (pp->sectorsize < sizeof(struct disklabel) || pp->mediasize < BBSIZE) return (false); if (BBSIZE % pp->sectorsize) return (false); /* Check that there's a disklabel. */ buf = g_read_data(cp, pp->sectorsize, pp->sectorsize, &error); if (buf == NULL) return (false); magic1 = le32dec(buf + 0); magic2 = le32dec(buf + 132); g_free(buf); if (magic1 == DISKMAGIC && magic2 == DISKMAGIC) return (true); return (false); } /* * Try to find a superblock on the provider. If successful, look for a volume * label and create an appropriate provider based on that. */ static void g_label_ufs_taste_common(struct g_consumer *cp, char *label, size_t size, int what) { struct g_provider *pp; struct fs *fs; g_topology_assert_not(); pp = cp->provider; label[0] = '\0'; fs = NULL; if (SBLOCKSIZE % pp->sectorsize != 0 || ffs_sbget(cp, &fs, UFS_STDSB, UFS_NOHASHFAIL | UFS_NOCSUM | UFS_NOMSG, M_GEOM, g_use_g_read_data) != 0) { KASSERT(fs == NULL, ("g_label_ufs_taste_common: non-NULL fs %p\n", fs)); return; } /* Check for magic. */ if (fs->fs_magic == FS_UFS1_MAGIC && fs->fs_fsize > 0) { /* Valid UFS1. */ } else if (fs->fs_magic == FS_UFS2_MAGIC && fs->fs_fsize > 0) { /* Valid UFS2. */ } else { goto out; } /* Check if this should be ignored for compatibility. */ if (g_label_ufs_ignore_bsdlabel_slice(cp, fs)) goto out; G_LABEL_DEBUG(1, "%s file system detected on %s.", fs->fs_magic == FS_UFS1_MAGIC ? "UFS1" : "UFS2", pp->name); switch (what) { case G_LABEL_UFS_VOLUME: /* Check for volume label */ if (fs->fs_volname[0] != '\0') strlcpy(label, fs->fs_volname, size); break; case G_LABEL_UFS_ID: if (fs->fs_id[0] != 0 || fs->fs_id[1] != 0) snprintf(label, size, "%08x%08x", fs->fs_id[0], fs->fs_id[1]); break; } out: g_free(fs); } static void g_label_ufs_volume_taste(struct g_consumer *cp, char *label, size_t size) { g_label_ufs_taste_common(cp, label, size, G_LABEL_UFS_VOLUME); } static void g_label_ufs_id_taste(struct g_consumer *cp, char *label, size_t size) { g_label_ufs_taste_common(cp, label, size, G_LABEL_UFS_ID); } struct g_label_desc g_label_ufs_volume = { .ld_taste = g_label_ufs_volume_taste, .ld_dirprefix = "ufs/", .ld_enabled = 1 }; struct g_label_desc g_label_ufs_id = { .ld_taste = g_label_ufs_id_taste, .ld_dirprefix = "ufsid/", .ld_enabled = 1 }; G_LABEL_INIT(ufsid, g_label_ufs_id, "Create device nodes for UFS file system IDs"); G_LABEL_INIT(ufs, g_label_ufs_volume, "Create device nodes for UFS volume names"); MODULE_DEPEND(g_label, ufs, 1, 1, 1);