/* $OpenBSD: mke2fs.c,v 1.16 2016/03/14 20:30:34 natano Exp $ */ /* $NetBSD: mke2fs.c,v 1.13 2009/10/19 18:41:08 bouyer Exp $ */ /*- * Copyright (c) 2007 Izumi Tsutsui. 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 AUTHOR ``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 AUTHOR 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. */ /* * Copyright (c) 1980, 1989, 1993 * The Regents of the University of California. 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. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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. */ /* * Copyright (c) 1997 Manuel Bouyer. * * 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 AUTHOR ``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 AUTHOR 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. */ /* * mke2fs.c: "re-invent (dumb but non-GPLed) wheel as a fun project" * * In spite of this name, there is no piece of code * derived from GPLed e2fsprogs written for Linux. * I referred them only to see how each structure * member should be initialized. * * Reference: * - All NetBSD sources under src/sys/ufs/ext2fs and src/sbin/fsck_ext2fs * - Ext2fs Home Page * http://e2fsprogs.sourceforge.net/ext2.html * - Design and Implementation of the Second Extended Filesystem * http://e2fsprogs.sourceforge.net/ext2intro.html * - Linux Documentation "The Second Extended Filesystem" * src/linux/Documentation/filesystems/ext2.txt * in the Linux kernel distribution */ #include /* MAXBSIZE powerof2 roundup setbit isset MIN */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "extern.h" static void initcg(uint); static void zap_old_sblock(daddr32_t); static uint cgoverhead(uint); static int fsinit(const struct timeval *); static int makedir(struct ext2fs_direct *, int); static void copy_dir(struct ext2fs_direct *, struct ext2fs_direct *); static void init_resizeino(const struct timeval *); static uint32_t alloc(uint32_t, uint16_t); static void iput(struct ext2fs_dinode *, ino_t); static void rdfs(daddr32_t, int, void *); static void wtfs(daddr32_t, int, void *); static int ilog2(uint); static int skpc(int, size_t, uint8_t *); static void uuid_get(struct m_ext2fs *); /* XXX: some of these macro should be into ? */ #define EXT2_DEF_MAX_MNT_COUNT 20 #define EXT2_DEF_FSCKINTV (180 * 24 * 60 * 60) /* 180 days */ #define EXT2_RESERVED_INODES (EXT2_FIRSTINO - 1) #define EXT2_UMASK 0755 #define EXT2_INO_INDEX(ino) ((ino) - 1) /* no inode zero */ #define EXT2_LOSTFOUNDSIZE 16384 #define EXT2_LOSTFOUNDINO EXT2_FIRSTINO /* XXX: not quite */ #define EXT2_LOSTFOUNDUMASK 0700 #define EXT2_RESIZEINOUMASK 0600 #define NBLOCK_SUPERBLOCK 1 #define NBLOCK_BLOCK_BITMAP 1 #define NBLOCK_INODE_BITMAP 1 #define cgbase(fs, c) \ ((fs)->e2fs.e2fs_first_dblock + (fs)->e2fs.e2fs_bpg * (c)) #define rounddown(x,y) (((x)/(y))*(y)) /* * ext2fs super block and group descriptor structures * * We don't have to use or setup whole in-memory m_ext2fs structure, * but prepare it to use several macro defined in kernel headers. */ union { struct m_ext2fs m_ext2fs; char pad[SBSIZE]; } ext2fsun; #define sblock ext2fsun.m_ext2fs #define gd ext2fsun.m_ext2fs.e2fs_gd static uint8_t *iobuf; /* for superblock and group descriptors */ static int iobufsize; static uint8_t buf[MAXBSIZE]; /* for initcg() and makedir() ops */ static int fd; extern int max_cols; void mke2fs(const char *fsys, int f) { struct timeval tv; int64_t minfssize; uint bcount, fbcount, ficount; uint blocks_gd, blocks_per_cg, inodes_per_cg, iblocks_per_cg; uint minblocks_per_cg, blocks_lastcg; uint ncg, cylno, sboff; int i, len, col, delta, fld_width; gettimeofday(&tv, NULL); fd = f; /* * collect and verify the block and fragment sizes */ if (!powerof2(bsize)) { errx(EXIT_FAILURE, "block size must be a power of 2, not %u\n", bsize); } if (!powerof2(fsize)) { errx(EXIT_FAILURE, "fragment size must be a power of 2, not %u\n", fsize); } if (fsize < sectorsize) { errx(EXIT_FAILURE, "fragment size %u is too small, minimum is %u\n", fsize, sectorsize); } if (bsize < MINBSIZE) { errx(EXIT_FAILURE, "block size %u is too small, minimum is %u\n", bsize, MINBSIZE); } if (bsize > EXT2_MAXBSIZE) { errx(EXIT_FAILURE, "block size %u is too large, maximum is %u\n", bsize, MAXBSIZE); } if (bsize != fsize) { /* * There is no fragment support on current ext2fs (yet?), * but some kernel code refers fsize or fpg as bsize or bpg * and Linux seems to set the same values to them. */ errx(EXIT_FAILURE, "block size (%u) can't be different from " "fragment size (%u)\n", bsize, fsize); } /* variable inodesize is REV1 feature */ if (Oflag == 0 && inodesize != EXT2_REV0_DINODE_SIZE) { errx(EXIT_FAILURE, "GOOD_OLD_REV file system format" " doesn't support %d byte inode\n", inodesize); } sblock.e2fs.e2fs_log_bsize = ilog2(bsize) - LOG_MINBSIZE; sblock.e2fs.e2fs_log_fsize = ilog2(fsize) - LOG_MINFSIZE; sblock.e2fs_bsize = bsize; sblock.e2fs_fsize = fsize; sblock.e2fs_bshift = sblock.e2fs.e2fs_log_bsize + LOG_MINBSIZE; sblock.e2fs_qbmask = sblock.e2fs_bsize - 1; sblock.e2fs_bmask = ~sblock.e2fs_qbmask; sblock.e2fs_fsbtodb = ilog2(sblock.e2fs_bsize) - ilog2(sectorsize); sblock.e2fs_ipb = sblock.e2fs_bsize / inodesize; /* * Ext2fs preserves BBSIZE (1024 bytes) space at the top for * bootloader (though it is not enough at all for our bootloader). * If bsize == BBSIZE we have to preserve one block. * If bsize > BBSIZE, the first block already contains BBSIZE space * before superblock because superblock is allocated at SBOFF and * bsize is a power of two (i.e. 2048 bytes or more). */ sblock.e2fs.e2fs_first_dblock = (sblock.e2fs_bsize > BBSIZE) ? 0 : 1; minfssize = fsbtodb(&sblock, sblock.e2fs.e2fs_first_dblock + NBLOCK_SUPERBLOCK + 1 /* at least one group descriptor */ + NBLOCK_BLOCK_BITMAP + NBLOCK_INODE_BITMAP + 1 /* at least one inode table block */ + 1 /* at least one data block for rootdir */ + 1 /* at least one data block for data */ ); /* XXX and more? */ if (fssize < minfssize) errx(EXIT_FAILURE, "Filesystem size %" PRId64 " < minimum size of %" PRId64 "\n", fssize, minfssize); bcount = dbtofsb(&sblock, fssize); /* * While many people claim that ext2fs is a (bad) clone of ufs/ffs, * it isn't actual ffs so maybe we should call it "block group" * as their native name rather than ffs derived "cylinder group." * But we'll use the latter here since other kernel sources use it. * (I also agree "cylinder" based allocation is obsolete though) */ /* maybe "simple is the best" */ blocks_per_cg = sblock.e2fs_bsize * NBBY; ncg = howmany(bcount - sblock.e2fs.e2fs_first_dblock, blocks_per_cg); blocks_gd = howmany(sizeof(struct ext2_gd) * ncg, bsize); /* check range of inode number */ if (num_inodes < EXT2_FIRSTINO) num_inodes = EXT2_FIRSTINO; /* needs reserved inodes + 1 */ if (num_inodes > UINT16_MAX * ncg) num_inodes = UINT16_MAX * ncg; /* ext2bgd_nifree is uint16_t */ inodes_per_cg = num_inodes / ncg; iblocks_per_cg = howmany(inodesize * inodes_per_cg, bsize); /* Check that the last cylinder group has enough space for inodes */ minblocks_per_cg = NBLOCK_BLOCK_BITMAP + NBLOCK_INODE_BITMAP + iblocks_per_cg + 1; /* at least one data block */ if (Oflag == 0 || cg_has_sb(ncg - 1) != 0) minblocks_per_cg += NBLOCK_SUPERBLOCK + blocks_gd; blocks_lastcg = bcount - sblock.e2fs.e2fs_first_dblock - blocks_per_cg * (ncg - 1); if (blocks_lastcg < minblocks_per_cg) { /* * Since we make all the cylinder groups the same size, the * last will only be small if there are more than one * cylinder groups. If the last one is too small to store * filesystem data, just kill it. * * XXX: Does fsck_ext2fs(8) properly handle this case? */ bcount -= blocks_lastcg; ncg--; blocks_lastcg = blocks_per_cg; blocks_gd = howmany(sizeof(struct ext2_gd) * ncg, bsize); inodes_per_cg = num_inodes / ncg; } /* roundup inodes_per_cg to make it use whole inode table blocks */ inodes_per_cg = roundup(inodes_per_cg, sblock.e2fs_ipb); num_inodes = inodes_per_cg * ncg; iblocks_per_cg = inodes_per_cg / sblock.e2fs_ipb; /* XXX: probably we should check these adjusted values again */ sblock.e2fs.e2fs_bcount = bcount; sblock.e2fs.e2fs_icount = num_inodes; sblock.e2fs_ncg = ncg; sblock.e2fs_ngdb = blocks_gd; sblock.e2fs_itpg = iblocks_per_cg; sblock.e2fs.e2fs_rbcount = sblock.e2fs.e2fs_bcount * minfree / 100; /* e2fs_fbcount will be accounted later */ /* e2fs_ficount will be accounted later */ sblock.e2fs.e2fs_bpg = blocks_per_cg; sblock.e2fs.e2fs_fpg = blocks_per_cg; sblock.e2fs.e2fs_ipg = inodes_per_cg; sblock.e2fs.e2fs_mtime = 0; sblock.e2fs.e2fs_wtime = (u_int32_t)tv.tv_sec; sblock.e2fs.e2fs_mnt_count = 0; /* XXX: should add some entropy to avoid checking all fs at once? */ sblock.e2fs.e2fs_max_mnt_count = EXT2_DEF_MAX_MNT_COUNT; sblock.e2fs.e2fs_magic = E2FS_MAGIC; sblock.e2fs.e2fs_state = E2FS_ISCLEAN; sblock.e2fs.e2fs_beh = E2FS_BEH_DEFAULT; sblock.e2fs.e2fs_minrev = 0; sblock.e2fs.e2fs_lastfsck = (u_int32_t)tv.tv_sec; sblock.e2fs.e2fs_fsckintv = EXT2_DEF_FSCKINTV; /* * Maybe we can use E2FS_OS_FREEBSD here and it would be more proper, * but the purpose of this newfs_ext2fs(8) command is to provide * a filesystem which can be recognized by firmware on some * Linux based appliances that can load bootstrap files only from * (their native) ext2fs, and anyway we will (and should) try to * act like them as much as possible. * * Anyway, I hope that all newer such boxes will keep their support * for the "GOOD_OLD_REV" ext2fs. */ sblock.e2fs.e2fs_creator = E2FS_OS_LINUX; if (Oflag == 0) { sblock.e2fs.e2fs_rev = E2FS_REV0; sblock.e2fs.e2fs_features_compat = 0; sblock.e2fs.e2fs_features_incompat = 0; sblock.e2fs.e2fs_features_rocompat = 0; } else { sblock.e2fs.e2fs_rev = E2FS_REV1; /* * e2fsprogs say "REV1" is "dynamic" so * it isn't quite a version and maybe it means * "extended from REV0 so check compat features." * * XXX: We don't have any native tool to activate * the EXT2F_COMPAT_RESIZE feature and * fsck_ext2fs(8) might not fix structures for it. */ sblock.e2fs.e2fs_features_compat = EXT2F_COMPAT_RESIZE; sblock.e2fs.e2fs_features_incompat = EXT2F_INCOMPAT_FTYPE; sblock.e2fs.e2fs_features_rocompat = EXT2F_ROCOMPAT_SPARSESUPER | EXT2F_ROCOMPAT_LARGEFILE; } sblock.e2fs.e2fs_ruid = geteuid(); sblock.e2fs.e2fs_rgid = getegid(); sblock.e2fs.e2fs_first_ino = EXT2_FIRSTINO; sblock.e2fs.e2fs_inode_size = inodesize; /* e2fs_block_group_nr is set on writing superblock to each group */ uuid_get(&sblock); if (volname != NULL) { if (strlen(volname) > sizeof(sblock.e2fs.e2fs_vname)) errx(EXIT_FAILURE, "Volume name is too long"); strlcpy(sblock.e2fs.e2fs_vname, volname, sizeof(sblock.e2fs.e2fs_vname)); } sblock.e2fs.e2fs_fsmnt[0] = '\0'; sblock.e2fs_fsmnt[0] = '\0'; sblock.e2fs.e2fs_algo = 0; /* XXX unsupported? */ sblock.e2fs.e2fs_prealloc = 0; /* XXX unsupported? */ sblock.e2fs.e2fs_dir_prealloc = 0; /* XXX unsupported? */ /* calculate blocks for reserved group descriptors for resize */ sblock.e2fs.e2fs_reserved_ngdb = 0; if (sblock.e2fs.e2fs_rev > E2FS_REV0 && (sblock.e2fs.e2fs_features_compat & EXT2F_COMPAT_RESIZE) != 0) { uint64_t target_blocks; uint target_ncg, target_ngdb, reserved_ngdb; /* reserve descriptors for size as 1024 times as current */ target_blocks = (sblock.e2fs.e2fs_bcount - sblock.e2fs.e2fs_first_dblock) * 1024ULL; /* number of blocks must be in uint32_t */ if (target_blocks > UINT32_MAX) target_blocks = UINT32_MAX; target_ncg = howmany(target_blocks, sblock.e2fs.e2fs_bpg); target_ngdb = howmany(sizeof(struct ext2_gd) * target_ncg, sblock.e2fs_bsize); /* * Reserved group descriptor blocks are preserved as * the second level double indirect reference blocks in * the EXT2_RESIZEINO inode, so the maximum number of * the blocks is NINDIR(fs). * (see also descriptions in init_resizeino() function) * * We check a number including current e2fs_ngdb here * because they will be moved into reserved gdb on * possible future size shrink, though e2fsprogs don't * seem to care about it. */ if (target_ngdb > NINDIR(&sblock)) target_ngdb = NINDIR(&sblock); reserved_ngdb = target_ngdb - sblock.e2fs_ngdb; /* make sure reserved_ngdb fits in the last cg */ if (reserved_ngdb >= blocks_lastcg - cgoverhead(ncg - 1)) reserved_ngdb = blocks_lastcg - cgoverhead(ncg - 1); if (reserved_ngdb == 0) { /* if no space for reserved gdb, disable the feature */ sblock.e2fs.e2fs_features_compat &= ~EXT2F_COMPAT_RESIZE; } sblock.e2fs.e2fs_reserved_ngdb = reserved_ngdb; } /* * Initialize group descriptors */ gd = calloc(sblock.e2fs_ngdb, bsize); if (gd == NULL) errx(EXIT_FAILURE, "Can't allocate descriptors buffer"); fbcount = 0; ficount = 0; for (cylno = 0; cylno < ncg; cylno++) { uint boffset; boffset = cgbase(&sblock, cylno); if (sblock.e2fs.e2fs_rev == E2FS_REV0 || (sblock.e2fs.e2fs_features_rocompat & EXT2F_ROCOMPAT_SPARSESUPER) == 0 || cg_has_sb(cylno)) { boffset += NBLOCK_SUPERBLOCK + sblock.e2fs_ngdb; if (sblock.e2fs.e2fs_rev > E2FS_REV0 && (sblock.e2fs.e2fs_features_compat & EXT2F_COMPAT_RESIZE) != 0) boffset += sblock.e2fs.e2fs_reserved_ngdb; } gd[cylno].ext2bgd_b_bitmap = boffset; boffset += NBLOCK_BLOCK_BITMAP; gd[cylno].ext2bgd_i_bitmap = boffset; boffset += NBLOCK_INODE_BITMAP; gd[cylno].ext2bgd_i_tables = boffset; if (cylno == (ncg - 1)) gd[cylno].ext2bgd_nbfree = blocks_lastcg - cgoverhead(cylno); else gd[cylno].ext2bgd_nbfree = sblock.e2fs.e2fs_bpg - cgoverhead(cylno); fbcount += gd[cylno].ext2bgd_nbfree; gd[cylno].ext2bgd_nifree = sblock.e2fs.e2fs_ipg; if (cylno == 0) { /* take reserved inodes off nifree */ gd[cylno].ext2bgd_nifree -= EXT2_RESERVED_INODES; } ficount += gd[cylno].ext2bgd_nifree; gd[cylno].ext2bgd_ndirs = 0; } sblock.e2fs.e2fs_fbcount = fbcount; sblock.e2fs.e2fs_ficount = ficount; /* * Dump out summary information about file system. */ if (verbosity > 0) { printf("%s: %u.%1uMB (%" PRId64 " sectors) " "block size %u, fragment size %u\n", fsys, (uint)(((uint64_t)bcount * bsize) / (1024 * 1024)), (uint)((uint64_t)bcount * bsize - rounddown((uint64_t)bcount * bsize, 1024 * 1024)) / 1024 / 100, fssize, bsize, fsize); printf("\tusing %u block groups of %u.0MB, %u blks, " "%u inodes.\n", ncg, bsize * sblock.e2fs.e2fs_bpg / (1024 * 1024), sblock.e2fs.e2fs_bpg, sblock.e2fs.e2fs_ipg); } /* * allocate space for superblock and group descriptors */ iobufsize = (NBLOCK_SUPERBLOCK + sblock.e2fs_ngdb) * sblock.e2fs_bsize; iobuf = mmap(0, iobufsize, PROT_READ|PROT_WRITE, MAP_ANON|MAP_PRIVATE, -1, 0); if (iobuf == MAP_FAILED) errx(EXIT_FAILURE, "Cannot allocate I/O buffer\n"); /* * We now start writing to the filesystem */ if (!Nflag) { static const uint pbsize[] = { 1024, 2048, 4096, 0 }; uint pblock, epblock; /* * Validate the given file system size. * Verify that its last block can actually be accessed. * Convert to file system fragment sized units. */ if (fssize <= 0) errx(EXIT_FAILURE, "Preposterous size %" PRId64 "\n", fssize); wtfs(fssize - 1, sectorsize, iobuf); /* * Ensure there is nothing that looks like a filesystem * superblock anywhere other than where ours will be. * If fsck_ext2fs finds the wrong one all hell breaks loose! * * XXX: needs to check how fsck_ext2fs programs even * on other OSes determine alternate superblocks */ for (i = 0; pbsize[i] != 0; i++) { epblock = (uint64_t)bcount * bsize / pbsize[i]; for (pblock = ((pbsize[i] == SBSIZE) ? 1 : 0); pblock < epblock; pblock += pbsize[i] * NBBY /* bpg */) zap_old_sblock((daddr32_t)pblock * pbsize[i] / sectorsize); } } if (verbosity >= 3) printf("super-block backups (for fsck_ext2fs -b #) at:\n"); /* If we are printing more than one line of numbers, line up columns */ fld_width = verbosity < 4 ? 1 : snprintf(NULL, 0, "%" PRIu64, (uint64_t)cgbase(&sblock, ncg - 1)); if (Nflag && verbosity == 3) /* Leave space to add " ..." after one row of numbers */ max_cols -= 4; #define BASE 0x10000 /* For some fixed-point maths */ col = 0; delta = verbosity > 2 ? 0 : max_cols * BASE / ncg; for (cylno = 0; cylno < ncg; cylno++) { fflush(stdout); initcg(cylno); if (verbosity < 2) continue; /* the first one is a master, not backup */ if (cylno == 0) continue; /* skip if this cylinder doesn't have a backup */ if (sblock.e2fs.e2fs_rev > E2FS_REV0 && (sblock.e2fs.e2fs_features_rocompat & EXT2F_ROCOMPAT_SPARSESUPER) != 0 && cg_has_sb(cylno) == 0) continue; if (delta > 0) { if (Nflag) /* No point doing dots for -N */ break; /* Print dots scaled to end near RH margin */ for (col += delta; col > BASE; col -= BASE) printf("."); continue; } /* Print superblock numbers */ len = printf(" %*" PRIu64 "," + !col, fld_width, (uint64_t)cgbase(&sblock, cylno)); col += len; if (col + len < max_cols) /* Next number fits */ continue; /* Next number won't fit, need a newline */ if (verbosity <= 3) { /* Print dots for subsequent cylinder groups */ delta = sblock.e2fs_ncg - cylno - 1; if (delta != 0) { if (Nflag) { printf(" ..."); break; } delta = max_cols * BASE / delta; } } col = 0; printf("\n"); } #undef BASE if (col > 0) printf("\n"); if (Nflag) return; /* * Now construct the initial file system, */ if (fsinit(&tv) == 0) errx(EXIT_FAILURE, "Error making filesystem"); /* * Write out the superblock and group descriptors */ sblock.e2fs.e2fs_block_group_nr = 0; sboff = 0; if (cgbase(&sblock, 0) == 0) { /* * If the first block contains the boot block sectors, * (i.e. in case of sblock.e2fs.e2fs_bsize > BBSIZE) * we have to preserve data in it. */ sboff = SBOFF; } e2fs_sbsave(&sblock.e2fs, (struct ext2fs *)(iobuf + sboff)); e2fs_cgsave(gd, (struct ext2_gd *)(iobuf + sblock.e2fs_bsize), sizeof(struct ext2_gd) * sblock.e2fs_ncg); wtfs(fsbtodb(&sblock, cgbase(&sblock, 0)) + sboff / sectorsize, iobufsize - sboff, iobuf + sboff); munmap(iobuf, iobufsize); } /* * Initialize a cylinder (block) group. */ void initcg(uint cylno) { uint nblcg, i, j, sboff; struct ext2fs_dinode *dp; /* * Make a copy of the superblock and group descriptors. */ if (sblock.e2fs.e2fs_rev == E2FS_REV0 || (sblock.e2fs.e2fs_features_rocompat & EXT2F_ROCOMPAT_SPARSESUPER) == 0 || cg_has_sb(cylno)) { sblock.e2fs.e2fs_block_group_nr = cylno; sboff = 0; if (cgbase(&sblock, cylno) == 0) { /* preserve data in bootblock in cg0 */ sboff = SBOFF; } e2fs_sbsave(&sblock.e2fs, (struct ext2fs *)(iobuf + sboff)); e2fs_cgsave(gd, (struct ext2_gd *)(iobuf + sblock.e2fs_bsize * NBLOCK_SUPERBLOCK), sizeof(struct ext2_gd) * sblock.e2fs_ncg); /* write superblock and group descriptor backups */ wtfs(fsbtodb(&sblock, cgbase(&sblock, cylno)) + sboff / sectorsize, iobufsize - sboff, iobuf + sboff); } /* * Initialize block bitmap. */ memset(buf, 0, sblock.e2fs_bsize); if (cylno == (sblock.e2fs_ncg - 1)) { /* The last group could have less blocks than e2fs_bpg. */ nblcg = sblock.e2fs.e2fs_bcount - cgbase(&sblock, sblock.e2fs_ncg - 1); for (i = nblcg; i < roundup(nblcg, NBBY); i++) setbit(buf, i); memset(&buf[i / NBBY], ~0U, sblock.e2fs.e2fs_bpg - i); } /* set overhead (superblock, group descriptor etc.) blocks used */ for (i = 0; i < cgoverhead(cylno) / NBBY; i++) buf[i] = ~0; i = i * NBBY; for (; i < cgoverhead(cylno); i++) setbit(buf, i); wtfs(fsbtodb(&sblock, gd[cylno].ext2bgd_b_bitmap), sblock.e2fs_bsize, buf); /* * Initialize inode bitmap. * * Assume e2fs_ipg is a multiple of NBBY since * it's a multiple of e2fs_ipb (as we did above). * Note even (possibly smaller) the last group has the same e2fs_ipg. */ i = sblock.e2fs.e2fs_ipg / NBBY; memset(buf, 0, i); memset(buf + i, ~0U, sblock.e2fs_bsize - i); if (cylno == 0) { /* mark reserved inodes */ for (i = 1; i < EXT2_FIRSTINO; i++) setbit(buf, EXT2_INO_INDEX(i)); } wtfs(fsbtodb(&sblock, gd[cylno].ext2bgd_i_bitmap), sblock.e2fs_bsize, buf); /* * Initialize inode tables. * * Just initialize generation numbers for NFS security. * XXX: sys/ufs/ext2fs/ext2fs_alloc.c:ext2fs_valloc() seems * to override these generated numbers. */ memset(buf, 0, sblock.e2fs_bsize); for (i = 0; i < sblock.e2fs_itpg; i++) { for (j = 0; j < sblock.e2fs_ipb; j++) { dp = (struct ext2fs_dinode *)(buf + inodesize * j); /* If there is some bias in arc4random(), keep it. */ dp->e2di_gen = htole32(arc4random()); } wtfs(fsbtodb(&sblock, gd[cylno].ext2bgd_i_tables + i), sblock.e2fs_bsize, buf); } } /* * Zap possible lingering old superblock data */ static void zap_old_sblock(daddr32_t sec) { static daddr32_t cg0_data; uint32_t oldfs[SBSIZE / sizeof(uint32_t)]; static const struct fsm { uint32_t offset; uint32_t magic; uint32_t mask; } fs_magics[] = { {offsetof(struct ext2fs, e2fs_magic) / 4, E2FS_MAGIC, 0xffff}, {offsetof(struct ext2fs, e2fs_magic) / 4, E2FS_MAGIC << 16, 0xffff0000}, {14, 0xef530000, 0xffff0000}, /* EXT2FS (big) */ {0x55c / 4, 0x00011954, ~0U}, /* FS_UFS1_MAGIC */ {0x55c / 4, 0x19540119, ~0U}, /* FS_UFS2_MAGIC */ {0, 0x70162, ~0U}, /* LFS_MAGIC */ {.offset = ~0U}, }; const struct fsm *fsm; if (Nflag) return; /* don't override data before superblock */ if (sec < SBOFF / sectorsize) return; if (cg0_data == 0) { cg0_data = ((daddr32_t)sblock.e2fs.e2fs_first_dblock + cgoverhead(0)) * sblock.e2fs_bsize / sectorsize; } /* Ignore anything that is beyond our filesystem */ if (sec >= fssize) return; /* Zero anything inside our filesystem... */ if (sec >= sblock.e2fs.e2fs_first_dblock * bsize / sectorsize) { /* ...unless we will write that area anyway */ if (sec >= cg0_data) /* assume iobuf is zero'ed here */ wtfs(sec, roundup(SBSIZE, sectorsize), iobuf); return; } /* * The sector might contain boot code, so we must validate it * * XXX: ext2fs won't preserve data after SBOFF, * but first_dblock could have a different value. */ rdfs(sec, sizeof(oldfs), &oldfs); for (fsm = fs_magics;; fsm++) { uint32_t v; if (fsm->mask == 0) return; v = oldfs[fsm->offset]; if ((v & fsm->mask) == fsm->magic || (swap32(v) & fsm->mask) == fsm->magic) break; } /* Just zap the magic number */ oldfs[fsm->offset] = 0; wtfs(sec, sizeof(oldfs), &oldfs); } /* * uint cgoverhead(uint c) * * Return a number of reserved blocks on the specified group. * XXX: should be shared with src/sbin/fsck_ext2fs/setup.c */ uint cgoverhead(uint c) { uint overh; overh = NBLOCK_BLOCK_BITMAP + NBLOCK_INODE_BITMAP + sblock.e2fs_itpg; if (sblock.e2fs.e2fs_rev == E2FS_REV0 || (sblock.e2fs.e2fs_features_rocompat & EXT2F_ROCOMPAT_SPARSESUPER) == 0 || cg_has_sb(c) != 0) { overh += NBLOCK_SUPERBLOCK + sblock.e2fs_ngdb; if (sblock.e2fs.e2fs_rev > E2FS_REV0 && (sblock.e2fs.e2fs_features_compat & EXT2F_COMPAT_RESIZE) != 0) overh += sblock.e2fs.e2fs_reserved_ngdb; } return overh; } /* * Initialize the file system */ #define LOSTDIR /* e2fsck complains if there is no lost+found */ #define PREDEFDIR 2 #ifdef LOSTDIR #define PREDEFROOTDIR (PREDEFDIR + 1) #else #define PREDEFROOTDIR PREDEFDIR #endif struct ext2fs_direct root_dir[] = { { EXT2_ROOTINO, 0, 1, 0, "." }, { EXT2_ROOTINO, 0, 2, 0, ".." }, #ifdef LOSTDIR { EXT2_LOSTFOUNDINO, 0, 10, 0, "lost+found" }, #endif }; #ifdef LOSTDIR struct ext2fs_direct lost_found_dir[] = { { EXT2_LOSTFOUNDINO, 0, 1, 0, "." }, { EXT2_ROOTINO, 0, 2, 0, ".." }, }; struct ext2fs_direct pad_dir = { 0, sizeof(struct ext2fs_direct), 0, 0, "" }; #endif int fsinit(const struct timeval *tv) { struct ext2fs_dinode node; #ifdef LOSTDIR uint i, nblks_lostfound, blk; #endif /* * Initialize the inode for the resizefs feature */ if (sblock.e2fs.e2fs_rev > E2FS_REV0 && (sblock.e2fs.e2fs_features_compat & EXT2F_COMPAT_RESIZE) != 0) init_resizeino(tv); /* * Initialize the node */ #ifdef LOSTDIR /* * Create the lost+found directory */ if (sblock.e2fs.e2fs_rev > E2FS_REV0 && sblock.e2fs.e2fs_features_incompat & EXT2F_INCOMPAT_FTYPE) { lost_found_dir[0].e2d_type = EXT2_FT_DIR; lost_found_dir[1].e2d_type = EXT2_FT_DIR; } (void)makedir(lost_found_dir, nitems(lost_found_dir)); /* prepare a bit large directory for preserved files */ nblks_lostfound = EXT2_LOSTFOUNDSIZE / sblock.e2fs_bsize; /* ...but only with direct blocks */ if (nblks_lostfound > NDADDR) nblks_lostfound = NDADDR; memset(&node, 0, sizeof(node)); node.e2di_mode = EXT2_IFDIR | EXT2_LOSTFOUNDUMASK; node.e2di_uid_low = geteuid(); node.e2di_size = sblock.e2fs_bsize * nblks_lostfound; node.e2di_atime = (u_int32_t)tv->tv_sec; node.e2di_ctime = (u_int32_t)tv->tv_sec; node.e2di_mtime = (u_int32_t)tv->tv_sec; node.e2di_gid_low = getegid(); node.e2di_nlink = PREDEFDIR; /* e2di_nblock is a number of disk blocks, not ext2fs blocks */ node.e2di_nblock = fsbtodb(&sblock, nblks_lostfound); node.e2di_blocks[0] = alloc(sblock.e2fs_bsize, node.e2di_mode); if (node.e2di_blocks[0] == 0) { printf("%s: can't allocate block for lost+found\n", __func__); return 0; } for (i = 1; i < nblks_lostfound; i++) { blk = alloc(sblock.e2fs_bsize, 0); if (blk == 0) { printf("%s: can't allocate blocks for lost+found\n", __func__); return 0; } node.e2di_blocks[i] = blk; } wtfs(fsbtodb(&sblock, node.e2di_blocks[0]), sblock.e2fs_bsize, buf); pad_dir.e2d_reclen = sblock.e2fs_bsize; for (i = 1; i < nblks_lostfound; i++) { memset(buf, 0, sblock.e2fs_bsize); copy_dir(&pad_dir, (struct ext2fs_direct *)buf); wtfs(fsbtodb(&sblock, node.e2di_blocks[i]), sblock.e2fs_bsize, buf); } iput(&node, EXT2_LOSTFOUNDINO); #endif /* * create the root directory */ memset(&node, 0, sizeof(node)); if (sblock.e2fs.e2fs_rev > E2FS_REV0 && sblock.e2fs.e2fs_features_incompat & EXT2F_INCOMPAT_FTYPE) { root_dir[0].e2d_type = EXT2_FT_DIR; root_dir[1].e2d_type = EXT2_FT_DIR; #ifdef LOSTDIR root_dir[2].e2d_type = EXT2_FT_DIR; #endif } node.e2di_mode = EXT2_IFDIR | EXT2_UMASK; node.e2di_uid_low = geteuid(); node.e2di_size = makedir(root_dir, nitems(root_dir)); node.e2di_atime = (u_int32_t)tv->tv_sec; node.e2di_ctime = (u_int32_t)tv->tv_sec; node.e2di_mtime = (u_int32_t)tv->tv_sec; node.e2di_gid_low = getegid(); node.e2di_nlink = PREDEFROOTDIR; /* e2di_nblock is a number of disk block, not ext2fs block */ node.e2di_nblock = fsbtodb(&sblock, 1); node.e2di_blocks[0] = alloc(node.e2di_size, node.e2di_mode); if (node.e2di_blocks[0] == 0) { printf("%s: can't allocate block for root dir\n", __func__); return 0; } wtfs(fsbtodb(&sblock, node.e2di_blocks[0]), sblock.e2fs_bsize, buf); iput(&node, EXT2_ROOTINO); return 1; } /* * Construct a set of directory entries in "buf". * return size of directory. */ int makedir(struct ext2fs_direct *protodir, int entries) { uint8_t *cp; uint i, spcleft; uint dirblksiz; dirblksiz = sblock.e2fs_bsize; memset(buf, 0, dirblksiz); spcleft = dirblksiz; for (cp = buf, i = 0; i < entries - 1; i++) { protodir[i].e2d_reclen = EXT2FS_DIRSIZ(protodir[i].e2d_namlen); copy_dir(&protodir[i], (struct ext2fs_direct *)cp); cp += protodir[i].e2d_reclen; spcleft -= protodir[i].e2d_reclen; } protodir[i].e2d_reclen = spcleft; copy_dir(&protodir[i], (struct ext2fs_direct *)cp); return dirblksiz; } /* * Copy a direntry to a buffer, in fs byte order */ static void copy_dir(struct ext2fs_direct *dir, struct ext2fs_direct *dbuf) { memcpy(dbuf, dir, EXT2FS_DIRSIZ(dir->e2d_namlen)); dbuf->e2d_ino = htole32(dir->e2d_ino); dbuf->e2d_reclen = htole16(dir->e2d_reclen); } /* * void init_resizeino(const struct timeval *tv); * * Initialize the EXT2_RESEIZE_INO inode to preserve * reserved group descriptor blocks for future growth of this ext2fs. */ void init_resizeino(const struct timeval *tv) { struct ext2fs_dinode node; uint64_t isize; uint32_t *dindir_block, *reserved_gdb; uint nblock, i, cylno, n; memset(&node, 0, sizeof(node)); /* * Note this function only prepares required structures for * future resize. It's a quite different work to implement * a utility like resize_ext2fs(8) which handles actual * resize ops even on offline. * * Anyway, I'm not sure if there is any documentation about * this resize ext2fs feature and related data structures, * and I've written this function based on things what I see * on some existing implementation and real file system data * created by existing tools. To be honest, they are not * so easy to read, so I will try to implement it here without * any dumb optimization for people who would eventually * work on "yet another wheel" like resize_ext2fs(8). */ /* * I'm not sure what type is appropriate for this inode. * The release notes of e2fsprogs says they changed e2fsck to allow * IFREG for RESIZEINO since a certain resize tool used it. Hmm. */ node.e2di_mode = EXT2_IFREG | EXT2_RESIZEINOUMASK; node.e2di_uid_low = geteuid(); node.e2di_atime = (u_int32_t)tv->tv_sec; node.e2di_ctime = (u_int32_t)tv->tv_sec; node.e2di_mtime = (u_int32_t)tv->tv_sec; node.e2di_gid_low = getegid(); node.e2di_nlink = 1; /* * To preserve the reserved group descriptor blocks, * EXT2_RESIZEINO uses only double indirect reference * blocks in its inode entries. * * All entries for direct, single indirect and triple * indirect references are left zero'ed. Maybe it's safe * because no write operation will happen with this inode. * * We have to allocate a block for the first level double * indirect reference block. Indexes of inode entries in * this first level dindirect block are corresponding to * indexes of group descriptors including both used (e2fs_ngdb) * and reserved (e2fs_reserved_ngdb) group descriptor blocks. * * Inode entries of indexes for used (e2fs_ngdb) descriptors are * left zero'ed. Entries for reserved (e2fs_reserved_ngdb) ones * have block numbers of actual reserved group descriptors * allocated at block group zero. This means e2fs_reserved_ngdb * blocks are reserved as the second level dindirect reference * blocks, and they actually contain block numbers of indirect * references. It may be safe since they don't have to keep any * data yet. * * Each these second dindirect blocks (i.e. reserved group * descriptor blocks in the first block group) should have * block numbers of its backups in all other block groups. * I.e. reserved_ngdb[0] block in block group 0 contains block * numbers of resreved_ngdb[0] from group 1 through (e2fs_ncg - 1). * The number of backups can be determined by the * EXT2_ROCOMPAT_SPARSESUPER feature and cg_has_sb() macro * as done in the above initcg() function. */ /* set e2di_size which occupies whole blocks through DINDIR blocks */ isize = (uint64_t)sblock.e2fs_bsize * NDADDR + (uint64_t)sblock.e2fs_bsize * NINDIR(&sblock) + (uint64_t)sblock.e2fs_bsize * NINDIR(&sblock) * NINDIR(&sblock); if (isize > UINT32_MAX && (sblock.e2fs.e2fs_features_rocompat & EXT2F_ROCOMPAT_LARGEFILE) == 0) { /* XXX should enable it here and update all backups? */ errx(EXIT_FAILURE, "%s: large_file rocompat feature is " "required to enable resize feature for this filesystem\n", __func__); } /* upper 32bit is stored into e2di_size_hi on REV1 feature */ node.e2di_size = isize & UINT32_MAX; node.e2di_size_hi = isize >> 32; #define SINGLE 0 /* index of single indirect block */ #define DOUBLE 1 /* index of double indirect block */ #define TRIPLE 2 /* index of triple indirect block */ /* zero out entries for direct references */ for (i = 0; i < NDADDR; i++) node.e2di_blocks[i] = 0; /* also zero out entries for single and triple indirect references */ node.e2di_blocks[NDADDR + SINGLE] = 0; node.e2di_blocks[NDADDR + TRIPLE] = 0; /* allocate a block for the first level double indirect reference */ node.e2di_blocks[NDADDR + DOUBLE] = alloc(sblock.e2fs_bsize, node.e2di_mode); if (node.e2di_blocks[NDADDR + DOUBLE] == 0) errx(EXIT_FAILURE, "%s: Can't allocate a dindirect block", __func__); /* account this first block */ nblock = fsbtodb(&sblock, 1); /* allocate buffer to set data in the dindirect block */ dindir_block = malloc(sblock.e2fs_bsize); if (dindir_block == NULL) errx(EXIT_FAILURE, "%s: Can't allocate buffer for a dindirect block", __func__); /* allocate buffer to set data in the group descriptor blocks */ reserved_gdb = malloc(sblock.e2fs_bsize); if (reserved_gdb == NULL) errx(EXIT_FAILURE, "%s: Can't allocate buffer for group descriptor blocks", __func__); /* * Setup block entries in the first level dindirect blocks */ for (i = 0; i < sblock.e2fs_ngdb; i++) { /* no need to handle used group descriptor blocks */ dindir_block[i] = 0; } for (; i < sblock.e2fs_ngdb + sblock.e2fs.e2fs_reserved_ngdb; i++) { /* * point reserved group descriptor block in the first * (i.e. master) block group * * XXX: e2fsprogs seem to use "(i % NINDIR(&sblock))" here * to store maximum NINDIR(&sblock) reserved gdbs. * I'm not sure what will be done on future filesystem * shrink in that case on their way. */ if (i >= NINDIR(&sblock)) errx(EXIT_FAILURE, "%s: too many reserved " "group descriptors (%u) for resize inode", __func__, sblock.e2fs.e2fs_reserved_ngdb); dindir_block[i] = htole32(cgbase(&sblock, 0) + NBLOCK_SUPERBLOCK + i); /* * Setup block entries in the second dindirect blocks * (which are primary reserved group descriptor blocks) * to point their backups. */ for (n = 0, cylno = 1; cylno < sblock.e2fs_ncg; cylno++) { /* skip block groups without backup */ if ((sblock.e2fs.e2fs_features_rocompat & EXT2F_ROCOMPAT_SPARSESUPER) != 0 && cg_has_sb(cylno) == 0) continue; if (n >= NINDIR(&sblock)) errx(EXIT_FAILURE, "%s: too many block groups " "for the resize feature", __func__); /* * These blocks are already reserved in * initcg() so no need to use alloc() here. */ reserved_gdb[n++] = htole32(cgbase(&sblock, cylno) + NBLOCK_SUPERBLOCK + i); nblock += fsbtodb(&sblock, 1); } for (; n < NINDIR(&sblock); n++) reserved_gdb[n] = 0; /* write group descriptor block as the second dindirect refs */ wtfs(fsbtodb(&sblock, letoh32(dindir_block[i])), sblock.e2fs_bsize, reserved_gdb); nblock += fsbtodb(&sblock, 1); } for (; i < NINDIR(&sblock); i++) { /* leave trailing entries unallocated */ dindir_block[i] = 0; } free(reserved_gdb); /* finally write the first level dindirect block */ wtfs(fsbtodb(&sblock, node.e2di_blocks[NDADDR + DOUBLE]), sblock.e2fs_bsize, dindir_block); free(dindir_block); node.e2di_nblock = nblock; iput(&node, EXT2_RESIZEINO); } /* * uint32_t alloc(uint32_t size, uint16_t mode) * * Allocate a block (from cylinder group 0) * Reference: src/sys/ufs/ext2fs/ext2fs_alloc.c:ext2fs_alloccg() */ uint32_t alloc(uint32_t size, uint16_t mode) { uint32_t loc, bno; uint8_t *bbp; uint len, map, i; if (gd[0].ext2bgd_nbfree == 0) return 0; if (size > sblock.e2fs_bsize) return 0; bbp = malloc(sblock.e2fs_bsize); if (bbp == NULL) return 0; rdfs(fsbtodb(&sblock, gd[0].ext2bgd_b_bitmap), sblock.e2fs_bsize, bbp); /* XXX: kernel uses e2fs_fpg here */ len = sblock.e2fs.e2fs_bpg / NBBY; #if 0 /* no need block allocation for root or lost+found dir */ for (loc = 0; loc < len; loc++) { if (bbp[loc] == 0) { bno = loc * NBBY; goto gotit; } } #endif loc = skpc(~0U, len, bbp); if (loc == 0) { free(bbp); return 0; } loc = len - loc; map = bbp[loc]; bno = loc * NBBY; for (i = 0; i < NBBY; i++, bno++) { if ((map & (1 << i)) == 0) goto gotit; } free(bbp); return 0; gotit: if (isset(bbp, bno)) errx(EXIT_FAILURE, "%s: inconsistent bitmap\n", __func__); setbit(bbp, bno); wtfs(fsbtodb(&sblock, gd[0].ext2bgd_b_bitmap), sblock.e2fs_bsize, bbp); free(bbp); /* XXX: modified group descriptors won't be written into backups */ gd[0].ext2bgd_nbfree--; if ((mode & EXT2_IFDIR) != 0) gd[0].ext2bgd_ndirs++; sblock.e2fs.e2fs_fbcount--; return sblock.e2fs.e2fs_first_dblock + bno; } /* * void iput(struct ext2fs_dinode *ip, ino_t ino) * * Put an inode entry into the corresponding table. */ static void iput(struct ext2fs_dinode *ip, ino_t ino) { daddr32_t d; uint c, i; struct ext2fs_dinode *dp; uint8_t *bp; bp = malloc(sblock.e2fs_bsize); if (bp == NULL) errx(EXIT_FAILURE, "%s: can't allocate buffer for inode\n", __func__); /* * Reserved inodes are allocated and accounted in initcg() * so skip checks of the bitmap and allocation for them. */ if (ino >= EXT2_FIRSTINO) { c = ino_to_cg(&sblock, ino); /* sanity check */ if (gd[c].ext2bgd_nifree == 0) errx(EXIT_FAILURE, "%s: no free inode %" PRIu64 " in block group %u\n", __func__, (uint64_t)ino, c); /* update inode bitmap */ rdfs(fsbtodb(&sblock, gd[0].ext2bgd_i_bitmap), sblock.e2fs_bsize, bp); /* more sanity */ if (isset(bp, EXT2_INO_INDEX(ino))) errx(EXIT_FAILURE, "%s: inode %" PRIu64 " already in use\n", __func__, (uint64_t)ino); setbit(bp, EXT2_INO_INDEX(ino)); wtfs(fsbtodb(&sblock, gd[0].ext2bgd_i_bitmap), sblock.e2fs_bsize, bp); gd[c].ext2bgd_nifree--; sblock.e2fs.e2fs_ficount--; } if (ino >= sblock.e2fs.e2fs_ipg * sblock.e2fs_ncg) errx(EXIT_FAILURE, "%s: inode value out of range (%" PRIu64 ").\n", __func__, (uint64_t)ino); /* update an inode entry in the table */ d = fsbtodb(&sblock, ino_to_fsba(&sblock, ino)); rdfs(d, sblock.e2fs_bsize, bp); dp = (struct ext2fs_dinode *)(bp + inodesize * ino_to_fsbo(&sblock, ino)); e2fs_isave(&sblock, ip, dp); /* e2fs_i_bswap() doesn't swap e2di_blocks addrs */ if ((ip->e2di_mode & EXT2_IFMT) != EXT2_IFLNK) { for (i = 0; i < NDADDR + NIADDR; i++) dp->e2di_blocks[i] = htole32(ip->e2di_blocks[i]); } /* If there is some bias in arc4random(), keep it. */ dp->e2di_gen = htole32(arc4random()); wtfs(d, sblock.e2fs_bsize, bp); free(bp); } /* * Read a block from the file system */ void rdfs(daddr32_t bno, int size, void *bf) { int n; off_t offset; offset = bno; n = pread(fd, bf, size, offset * sectorsize); if (n != size) err(EXIT_FAILURE, "%s: read error for sector %" PRId64, __func__, (int64_t)bno); } /* * Write a block to the file system */ void wtfs(daddr32_t bno, int size, void *bf) { int n; off_t offset; if (Nflag) return; offset = bno; n = pwrite(fd, bf, size, offset * sectorsize); if (n != size) err(EXIT_FAILURE, "%s: write error for sector %" PRId64, __func__, (int64_t)bno); } int ilog2(uint val) { if (val == 0 || !powerof2(val)) errx(EXIT_FAILURE, "%s: %u is not a power of 2\n", __func__, val); return ffs(val) - 1; } /* * int skpc(int mask, size_t size, uint8_t *cp) * * Locate an unsigned character of value mask inside cp[]. * (from src/sys/lib/libkern/skpc.c) */ int skpc(int mask, size_t size, uint8_t *cp) { uint8_t *end; end = &cp[size]; while (cp < end && *cp == (uint8_t)mask) cp++; return end - cp; } static void uuid_get(struct m_ext2fs *sb) { unsigned char buf[sizeof(sb->e2fs.e2fs_uuid)]; arc4random_buf(buf, sizeof(buf)); /* UUID version 4: random */ buf[6] &= 0x0f; buf[6] |= 0x40; /* RFC4122 variant */ buf[8] &= 0x3f; buf[8] |= 0x80; memcpy(sb->e2fs.e2fs_uuid, buf, sizeof(sb->e2fs.e2fs_uuid)); }