/* $NetBSD: ext2fs_vfsops.c,v 1.193 2015/03/28 19:24:04 maxv Exp $ */ /* * Copyright (c) 1989, 1991, 1993, 1994 * 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. * * @(#)ffs_vfsops.c 8.14 (Berkeley) 11/28/94 * Modified for ext2fs by Manuel Bouyer. */ /* * 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. * * @(#)ffs_vfsops.c 8.14 (Berkeley) 11/28/94 * Modified for ext2fs by Manuel Bouyer. */ #include __KERNEL_RCSID(0, "$NetBSD: ext2fs_vfsops.c,v 1.193 2015/03/28 19:24:04 maxv Exp $"); #if defined(_KERNEL_OPT) #include "opt_compat_netbsd.h" #endif #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include MODULE(MODULE_CLASS_VFS, ext2fs, "ffs"); int ext2fs_sbupdate(struct ufsmount *, int); static int ext2fs_sbfill(struct m_ext2fs *, int); static struct sysctllog *ext2fs_sysctl_log; extern const struct vnodeopv_desc ext2fs_vnodeop_opv_desc; extern const struct vnodeopv_desc ext2fs_specop_opv_desc; extern const struct vnodeopv_desc ext2fs_fifoop_opv_desc; const struct vnodeopv_desc * const ext2fs_vnodeopv_descs[] = { &ext2fs_vnodeop_opv_desc, &ext2fs_specop_opv_desc, &ext2fs_fifoop_opv_desc, NULL, }; struct vfsops ext2fs_vfsops = { .vfs_name = MOUNT_EXT2FS, .vfs_min_mount_data = sizeof (struct ufs_args), .vfs_mount = ext2fs_mount, .vfs_start = ufs_start, .vfs_unmount = ext2fs_unmount, .vfs_root = ufs_root, .vfs_quotactl = ufs_quotactl, .vfs_statvfs = ext2fs_statvfs, .vfs_sync = ext2fs_sync, .vfs_vget = ufs_vget, .vfs_loadvnode = ext2fs_loadvnode, .vfs_fhtovp = ext2fs_fhtovp, .vfs_vptofh = ext2fs_vptofh, .vfs_init = ext2fs_init, .vfs_reinit = ext2fs_reinit, .vfs_done = ext2fs_done, .vfs_mountroot = ext2fs_mountroot, .vfs_snapshot = (void *)eopnotsupp, .vfs_extattrctl = vfs_stdextattrctl, .vfs_suspendctl = (void *)eopnotsupp, .vfs_renamelock_enter = genfs_renamelock_enter, .vfs_renamelock_exit = genfs_renamelock_exit, .vfs_fsync = (void *)eopnotsupp, .vfs_opv_descs = ext2fs_vnodeopv_descs }; static const struct genfs_ops ext2fs_genfsops = { .gop_size = genfs_size, .gop_alloc = ext2fs_gop_alloc, .gop_write = genfs_gop_write, .gop_markupdate = ufs_gop_markupdate, }; static const struct ufs_ops ext2fs_ufsops = { .uo_itimes = ext2fs_itimes, .uo_update = ext2fs_update, .uo_bufrd = ext2fs_bufrd, .uo_bufwr = ext2fs_bufwr, }; /* Fill in the inode uid/gid from ext2 halves. */ void ext2fs_set_inode_guid(struct inode *ip) { ip->i_gid = ip->i_e2fs_gid; ip->i_uid = ip->i_e2fs_uid; if (ip->i_e2fs->e2fs.e2fs_rev > E2FS_REV0) { ip->i_gid |= ip->i_e2fs_gid_high << 16; ip->i_uid |= ip->i_e2fs_uid_high << 16; } } static int ext2fs_modcmd(modcmd_t cmd, void *arg) { int error; switch (cmd) { case MODULE_CMD_INIT: error = vfs_attach(&ext2fs_vfsops); if (error != 0) break; sysctl_createv(&ext2fs_sysctl_log, 0, NULL, NULL, CTLFLAG_PERMANENT, CTLTYPE_NODE, "ext2fs", SYSCTL_DESCR("Linux EXT2FS file system"), NULL, 0, NULL, 0, CTL_VFS, 17, CTL_EOL); /* * XXX the "17" above could be dynamic, thereby eliminating * one more instance of the "number to vfs" mapping problem, * but "17" is the order as taken from sys/mount.h */ break; case MODULE_CMD_FINI: error = vfs_detach(&ext2fs_vfsops); if (error != 0) break; sysctl_teardown(&ext2fs_sysctl_log); break; default: error = ENOTTY; break; } return (error); } /* * XXX Same structure as FFS inodes? Should we share a common pool? */ struct pool ext2fs_inode_pool; struct pool ext2fs_dinode_pool; extern u_long ext2gennumber; void ext2fs_init(void) { pool_init(&ext2fs_inode_pool, sizeof(struct inode), 0, 0, 0, "ext2fsinopl", &pool_allocator_nointr, IPL_NONE); pool_init(&ext2fs_dinode_pool, sizeof(struct ext2fs_dinode), 0, 0, 0, "ext2dinopl", &pool_allocator_nointr, IPL_NONE); ufs_init(); } void ext2fs_reinit(void) { ufs_reinit(); } void ext2fs_done(void) { ufs_done(); pool_destroy(&ext2fs_inode_pool); pool_destroy(&ext2fs_dinode_pool); } /* * Called by main() when ext2fs is going to be mounted as root. * * Name is updated by mount(8) after booting. */ int ext2fs_mountroot(void) { extern struct vnode *rootvp; struct m_ext2fs *fs; struct mount *mp; struct ufsmount *ump; int error; if (device_class(root_device) != DV_DISK) return (ENODEV); if ((error = vfs_rootmountalloc(MOUNT_EXT2FS, "root_device", &mp))) { vrele(rootvp); return (error); } if ((error = ext2fs_mountfs(rootvp, mp)) != 0) { vfs_unbusy(mp, false, NULL); vfs_destroy(mp); return (error); } mountlist_append(mp); ump = VFSTOUFS(mp); fs = ump->um_e2fs; memset(fs->e2fs_fsmnt, 0, sizeof(fs->e2fs_fsmnt)); (void) copystr(mp->mnt_stat.f_mntonname, fs->e2fs_fsmnt, sizeof(fs->e2fs_fsmnt) - 1, 0); if (fs->e2fs.e2fs_rev > E2FS_REV0) { memset(fs->e2fs.e2fs_fsmnt, 0, sizeof(fs->e2fs.e2fs_fsmnt)); (void) copystr(mp->mnt_stat.f_mntonname, fs->e2fs.e2fs_fsmnt, sizeof(fs->e2fs.e2fs_fsmnt) - 1, 0); } (void)ext2fs_statvfs(mp, &mp->mnt_stat); vfs_unbusy(mp, false, NULL); setrootfstime((time_t)fs->e2fs.e2fs_wtime); return (0); } /* * VFS Operations. * * mount system call */ int ext2fs_mount(struct mount *mp, const char *path, void *data, size_t *data_len) { struct lwp *l = curlwp; struct vnode *devvp; struct ufs_args *args = data; struct ufsmount *ump = NULL; struct m_ext2fs *fs; size_t size; int error = 0, flags, update; mode_t accessmode; if (args == NULL) return EINVAL; if (*data_len < sizeof *args) return EINVAL; if (mp->mnt_flag & MNT_GETARGS) { ump = VFSTOUFS(mp); if (ump == NULL) return EIO; memset(args, 0, sizeof *args); args->fspec = NULL; *data_len = sizeof *args; return 0; } update = mp->mnt_flag & MNT_UPDATE; /* Check arguments */ if (args->fspec != NULL) { /* * Look up the name and verify that it's sane. */ error = namei_simple_user(args->fspec, NSM_FOLLOW_NOEMULROOT, &devvp); if (error != 0) return (error); if (!update) { /* * Be sure this is a valid block device */ if (devvp->v_type != VBLK) error = ENOTBLK; else if (bdevsw_lookup(devvp->v_rdev) == NULL) error = ENXIO; } else { /* * Be sure we're still naming the same device * used for our initial mount */ ump = VFSTOUFS(mp); if (devvp != ump->um_devvp) { if (devvp->v_rdev != ump->um_devvp->v_rdev) error = EINVAL; else { vrele(devvp); devvp = ump->um_devvp; vref(devvp); } } } } else { if (!update) { /* New mounts must have a filename for the device */ return (EINVAL); } else { ump = VFSTOUFS(mp); devvp = ump->um_devvp; vref(devvp); } } /* * If mount by non-root, then verify that user has necessary * permissions on the device. * * Permission to update a mount is checked higher, so here we presume * updating the mount is okay (for example, as far as securelevel goes) * which leaves us with the normal check. */ if (error == 0) { accessmode = VREAD; if (update ? (mp->mnt_iflag & IMNT_WANTRDWR) != 0 : (mp->mnt_flag & MNT_RDONLY) == 0) accessmode |= VWRITE; vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_MOUNT, KAUTH_REQ_SYSTEM_MOUNT_DEVICE, mp, devvp, KAUTH_ARG(accessmode)); VOP_UNLOCK(devvp); } if (error) { vrele(devvp); return (error); } if (!update) { int xflags; if (mp->mnt_flag & MNT_RDONLY) xflags = FREAD; else xflags = FREAD|FWRITE; vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); error = VOP_OPEN(devvp, xflags, FSCRED); VOP_UNLOCK(devvp); if (error) goto fail; error = ext2fs_mountfs(devvp, mp); if (error) { vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); (void)VOP_CLOSE(devvp, xflags, NOCRED); VOP_UNLOCK(devvp); goto fail; } ump = VFSTOUFS(mp); fs = ump->um_e2fs; } else { /* * Update the mount. */ /* * The initial mount got a reference on this * device, so drop the one obtained via * namei(), above. */ vrele(devvp); ump = VFSTOUFS(mp); fs = ump->um_e2fs; if (fs->e2fs_ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) { /* * Changing from r/w to r/o */ flags = WRITECLOSE; if (mp->mnt_flag & MNT_FORCE) flags |= FORCECLOSE; error = ext2fs_flushfiles(mp, flags); if (error == 0 && ext2fs_cgupdate(ump, MNT_WAIT) == 0 && (fs->e2fs.e2fs_state & E2FS_ERRORS) == 0) { fs->e2fs.e2fs_state = E2FS_ISCLEAN; (void) ext2fs_sbupdate(ump, MNT_WAIT); } if (error) return (error); fs->e2fs_ronly = 1; } if (mp->mnt_flag & MNT_RELOAD) { error = ext2fs_reload(mp, l->l_cred, l); if (error) return (error); } if (fs->e2fs_ronly && (mp->mnt_iflag & IMNT_WANTRDWR)) { /* * Changing from read-only to read/write */ fs->e2fs_ronly = 0; if (fs->e2fs.e2fs_state == E2FS_ISCLEAN) fs->e2fs.e2fs_state = 0; else fs->e2fs.e2fs_state = E2FS_ERRORS; fs->e2fs_fmod = 1; } if (args->fspec == NULL) return 0; } error = set_statvfs_info(path, UIO_USERSPACE, args->fspec, UIO_USERSPACE, mp->mnt_op->vfs_name, mp, l); (void) copystr(mp->mnt_stat.f_mntonname, fs->e2fs_fsmnt, sizeof(fs->e2fs_fsmnt) - 1, &size); memset(fs->e2fs_fsmnt + size, 0, sizeof(fs->e2fs_fsmnt) - size); if (fs->e2fs.e2fs_rev > E2FS_REV0) { (void) copystr(mp->mnt_stat.f_mntonname, fs->e2fs.e2fs_fsmnt, sizeof(fs->e2fs.e2fs_fsmnt) - 1, &size); memset(fs->e2fs.e2fs_fsmnt, 0, sizeof(fs->e2fs.e2fs_fsmnt) - size); } if (fs->e2fs_fmod != 0) { /* XXX */ fs->e2fs_fmod = 0; if (fs->e2fs.e2fs_state == 0) fs->e2fs.e2fs_wtime = time_second; else printf("%s: file system not clean; please fsck(8)\n", mp->mnt_stat.f_mntfromname); (void) ext2fs_cgupdate(ump, MNT_WAIT); } return (error); fail: vrele(devvp); return (error); } /* * Reload all incore data for a filesystem (used after running fsck on * the root filesystem and finding things to fix). The filesystem must * be mounted read-only. * * Things to do to update the mount: * 1) invalidate all cached meta-data. * 2) re-read superblock from disk. * 3) re-read summary information from disk. * 4) invalidate all inactive vnodes. * 5) invalidate all cached file data. * 6) re-read inode data for all active vnodes. */ int ext2fs_reload(struct mount *mp, kauth_cred_t cred, struct lwp *l) { struct vnode *vp, *devvp; struct inode *ip; struct buf *bp; struct m_ext2fs *fs; struct ext2fs *newfs; int i, error; void *cp; struct ufsmount *ump; struct vnode_iterator *marker; if ((mp->mnt_flag & MNT_RDONLY) == 0) return (EINVAL); ump = VFSTOUFS(mp); /* * Step 1: invalidate all cached meta-data. */ devvp = ump->um_devvp; vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); error = vinvalbuf(devvp, 0, cred, l, 0, 0); VOP_UNLOCK(devvp); if (error) panic("ext2fs_reload: dirty1"); fs = ump->um_e2fs; /* * Step 2: re-read superblock from disk. Copy in new superblock, and compute * in-memory values. */ error = bread(devvp, SBLOCK, SBSIZE, 0, &bp); if (error) return error; newfs = (struct ext2fs *)bp->b_data; e2fs_sbload(newfs, &fs->e2fs); brelse(bp, 0); error = ext2fs_sbfill(fs, (mp->mnt_flag & MNT_RDONLY) != 0); if (error) return error; /* * Step 3: re-read summary information from disk. */ for (i = 0; i < fs->e2fs_ngdb; i++) { error = bread(devvp , EXT2_FSBTODB(fs, fs->e2fs.e2fs_first_dblock + 1 /* superblock */ + i), fs->e2fs_bsize, 0, &bp); if (error) { return (error); } e2fs_cgload((struct ext2_gd *)bp->b_data, &fs->e2fs_gd[i * fs->e2fs_bsize / sizeof(struct ext2_gd)], fs->e2fs_bsize); brelse(bp, 0); } vfs_vnode_iterator_init(mp, &marker); while ((vp = vfs_vnode_iterator_next(marker, NULL, NULL))) { /* * Step 4: invalidate all inactive vnodes. */ if (vrecycle(vp)) continue; /* * Step 5: invalidate all cached file data. */ if (vn_lock(vp, LK_EXCLUSIVE)) { vrele(vp); continue; } if (vinvalbuf(vp, 0, cred, l, 0, 0)) panic("ext2fs_reload: dirty2"); /* * Step 6: re-read inode data for all active vnodes. */ ip = VTOI(vp); error = bread(devvp, EXT2_FSBTODB(fs, ino_to_fsba(fs, ip->i_number)), (int)fs->e2fs_bsize, 0, &bp); if (error) { vput(vp); break; } cp = (char *)bp->b_data + (ino_to_fsbo(fs, ip->i_number) * EXT2_DINODE_SIZE(fs)); e2fs_iload((struct ext2fs_dinode *)cp, ip->i_din.e2fs_din); ext2fs_set_inode_guid(ip); brelse(bp, 0); vput(vp); } vfs_vnode_iterator_destroy(marker); return (error); } /* * Common code for mount and mountroot */ int ext2fs_mountfs(struct vnode *devvp, struct mount *mp) { struct lwp *l = curlwp; struct ufsmount *ump; struct buf *bp; struct ext2fs *fs; struct m_ext2fs *m_fs; dev_t dev; int error, i, ronly; kauth_cred_t cred; dev = devvp->v_rdev; cred = l->l_cred; /* Flush out any old buffers remaining from a previous use. */ vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); error = vinvalbuf(devvp, V_SAVE, cred, l, 0, 0); VOP_UNLOCK(devvp); if (error) return (error); ronly = (mp->mnt_flag & MNT_RDONLY) != 0; bp = NULL; ump = NULL; /* Read the superblock from disk, and swap it directly. */ error = bread(devvp, SBLOCK, SBSIZE, 0, &bp); if (error) goto out; fs = (struct ext2fs *)bp->b_data; m_fs = kmem_zalloc(sizeof(struct m_ext2fs), KM_SLEEP); e2fs_sbload(fs, &m_fs->e2fs); brelse(bp, 0); bp = NULL; /* Once swapped, validate and fill in the superblock. */ error = ext2fs_sbfill(m_fs, ronly); if (error) { kmem_free(m_fs, sizeof(struct m_ext2fs)); goto out; } m_fs->e2fs_ronly = ronly; ump = kmem_zalloc(sizeof(*ump), KM_SLEEP); ump->um_fstype = UFS1; ump->um_ops = &ext2fs_ufsops; ump->um_e2fs = m_fs; if (ronly == 0) { if (m_fs->e2fs.e2fs_state == E2FS_ISCLEAN) m_fs->e2fs.e2fs_state = 0; else m_fs->e2fs.e2fs_state = E2FS_ERRORS; m_fs->e2fs_fmod = 1; } /* XXX: should be added in ext2fs_sbfill()? */ m_fs->e2fs_gd = kmem_alloc(m_fs->e2fs_ngdb * m_fs->e2fs_bsize, KM_SLEEP); for (i = 0; i < m_fs->e2fs_ngdb; i++) { error = bread(devvp, EXT2_FSBTODB(m_fs, m_fs->e2fs.e2fs_first_dblock + 1 /* superblock */ + i), m_fs->e2fs_bsize, 0, &bp); if (error) { kmem_free(m_fs->e2fs_gd, m_fs->e2fs_ngdb * m_fs->e2fs_bsize); goto out; } e2fs_cgload((struct ext2_gd *)bp->b_data, &m_fs->e2fs_gd[ i * m_fs->e2fs_bsize / sizeof(struct ext2_gd)], m_fs->e2fs_bsize); brelse(bp, 0); bp = NULL; } mp->mnt_data = ump; mp->mnt_stat.f_fsidx.__fsid_val[0] = (long)dev; mp->mnt_stat.f_fsidx.__fsid_val[1] = makefstype(MOUNT_EXT2FS); mp->mnt_stat.f_fsid = mp->mnt_stat.f_fsidx.__fsid_val[0]; mp->mnt_stat.f_namemax = EXT2FS_MAXNAMLEN; mp->mnt_flag |= MNT_LOCAL; mp->mnt_dev_bshift = DEV_BSHIFT; /* XXX */ mp->mnt_fs_bshift = m_fs->e2fs_bshift; mp->mnt_iflag |= IMNT_DTYPE; ump->um_flags = 0; ump->um_mountp = mp; ump->um_dev = dev; ump->um_devvp = devvp; ump->um_nindir = EXT2_NINDIR(m_fs); ump->um_lognindir = ffs(EXT2_NINDIR(m_fs)) - 1; ump->um_bptrtodb = m_fs->e2fs_fsbtodb; ump->um_seqinc = 1; /* no frags */ ump->um_maxsymlinklen = EXT2_MAXSYMLINKLEN; ump->um_dirblksiz = m_fs->e2fs_bsize; ump->um_maxfilesize = ((uint64_t)0x80000000 * m_fs->e2fs_bsize - 1); spec_node_setmountedfs(devvp, mp); return (0); out: if (bp != NULL) brelse(bp, 0); if (ump) { kmem_free(ump->um_e2fs, sizeof(struct m_ext2fs)); kmem_free(ump, sizeof(*ump)); mp->mnt_data = NULL; } return (error); } /* * unmount system call */ int ext2fs_unmount(struct mount *mp, int mntflags) { struct ufsmount *ump; struct m_ext2fs *fs; int error, flags; flags = 0; if (mntflags & MNT_FORCE) flags |= FORCECLOSE; if ((error = ext2fs_flushfiles(mp, flags)) != 0) return (error); ump = VFSTOUFS(mp); fs = ump->um_e2fs; if (fs->e2fs_ronly == 0 && ext2fs_cgupdate(ump, MNT_WAIT) == 0 && (fs->e2fs.e2fs_state & E2FS_ERRORS) == 0) { fs->e2fs.e2fs_state = E2FS_ISCLEAN; (void) ext2fs_sbupdate(ump, MNT_WAIT); } if (ump->um_devvp->v_type != VBAD) spec_node_setmountedfs(ump->um_devvp, NULL); vn_lock(ump->um_devvp, LK_EXCLUSIVE | LK_RETRY); error = VOP_CLOSE(ump->um_devvp, fs->e2fs_ronly ? FREAD : FREAD|FWRITE, NOCRED); vput(ump->um_devvp); kmem_free(fs->e2fs_gd, fs->e2fs_ngdb * fs->e2fs_bsize); kmem_free(fs, sizeof(*fs)); kmem_free(ump, sizeof(*ump)); mp->mnt_data = NULL; mp->mnt_flag &= ~MNT_LOCAL; return (error); } /* * Flush out all the files in a filesystem. */ int ext2fs_flushfiles(struct mount *mp, int flags) { extern int doforce; int error; if (!doforce) flags &= ~FORCECLOSE; error = vflush(mp, NULLVP, flags); return (error); } /* * Get file system statistics. */ int ext2fs_statvfs(struct mount *mp, struct statvfs *sbp) { struct ufsmount *ump; struct m_ext2fs *fs; uint32_t overhead, overhead_per_group, ngdb; int i, ngroups; ump = VFSTOUFS(mp); fs = ump->um_e2fs; if (fs->e2fs.e2fs_magic != E2FS_MAGIC) panic("ext2fs_statvfs"); /* * Compute the overhead (FS structures) */ overhead_per_group = 1 /* block bitmap */ + 1 /* inode bitmap */ + fs->e2fs_itpg; overhead = fs->e2fs.e2fs_first_dblock + fs->e2fs_ncg * overhead_per_group; if (fs->e2fs.e2fs_rev > E2FS_REV0 && fs->e2fs.e2fs_features_rocompat & EXT2F_ROCOMPAT_SPARSESUPER) { for (i = 0, ngroups = 0; i < fs->e2fs_ncg; i++) { if (cg_has_sb(i)) ngroups++; } } else { ngroups = fs->e2fs_ncg; } ngdb = fs->e2fs_ngdb; if (fs->e2fs.e2fs_rev > E2FS_REV0 && fs->e2fs.e2fs_features_compat & EXT2F_COMPAT_RESIZE) ngdb += fs->e2fs.e2fs_reserved_ngdb; overhead += ngroups * (1 /* superblock */ + ngdb); sbp->f_bsize = fs->e2fs_bsize; sbp->f_frsize = MINBSIZE << fs->e2fs.e2fs_fsize; sbp->f_iosize = fs->e2fs_bsize; sbp->f_blocks = fs->e2fs.e2fs_bcount - overhead; sbp->f_bfree = fs->e2fs.e2fs_fbcount; sbp->f_bresvd = fs->e2fs.e2fs_rbcount; if (sbp->f_bfree > sbp->f_bresvd) sbp->f_bavail = sbp->f_bfree - sbp->f_bresvd; else sbp->f_bavail = 0; sbp->f_files = fs->e2fs.e2fs_icount; sbp->f_ffree = fs->e2fs.e2fs_ficount; sbp->f_favail = fs->e2fs.e2fs_ficount; sbp->f_fresvd = 0; copy_statvfs_info(sbp, mp); return (0); } static bool ext2fs_sync_selector(void *cl, struct vnode *vp) { struct inode *ip; ip = VTOI(vp); /* * Skip the vnode/inode if inaccessible. */ if (ip == NULL || vp->v_type == VNON) return false; if (((ip->i_flag & (IN_CHANGE | IN_UPDATE | IN_MODIFIED)) == 0 && LIST_EMPTY(&vp->v_dirtyblkhd) && UVM_OBJ_IS_CLEAN(&vp->v_uobj))) return false; return true; } /* * Go through the disk queues to initiate sandbagged IO; * go through the inodes to write those that have been modified; * initiate the writing of the super block if it has been modified. * * Note: we are always called with the filesystem marked `MPBUSY'. */ int ext2fs_sync(struct mount *mp, int waitfor, kauth_cred_t cred) { struct vnode *vp; struct ufsmount *ump = VFSTOUFS(mp); struct m_ext2fs *fs; struct vnode_iterator *marker; int error, allerror = 0; fs = ump->um_e2fs; if (fs->e2fs_fmod != 0 && fs->e2fs_ronly != 0) { /* XXX */ printf("fs = %s\n", fs->e2fs_fsmnt); panic("update: rofs mod"); } /* * Write back each (modified) inode. */ vfs_vnode_iterator_init(mp, &marker); while ((vp = vfs_vnode_iterator_next(marker, ext2fs_sync_selector, NULL))) { error = vn_lock(vp, LK_EXCLUSIVE); if (error) { vrele(vp); continue; } if (vp->v_type == VREG && waitfor == MNT_LAZY) error = ext2fs_update(vp, NULL, NULL, 0); else error = VOP_FSYNC(vp, cred, waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0); if (error) allerror = error; vput(vp); } vfs_vnode_iterator_destroy(marker); /* * Force stale file system control information to be flushed. */ if (waitfor != MNT_LAZY) { vn_lock(ump->um_devvp, LK_EXCLUSIVE | LK_RETRY); if ((error = VOP_FSYNC(ump->um_devvp, cred, waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0)) != 0) allerror = error; VOP_UNLOCK(ump->um_devvp); } /* * Write back modified superblock. */ if (fs->e2fs_fmod != 0) { fs->e2fs_fmod = 0; fs->e2fs.e2fs_wtime = time_second; if ((error = ext2fs_cgupdate(ump, waitfor))) allerror = error; } return (allerror); } /* * Read an inode from disk and initialize this vnode / inode pair. * Caller assures no other thread will try to load this inode. */ int ext2fs_loadvnode(struct mount *mp, struct vnode *vp, const void *key, size_t key_len, const void **new_key) { ino_t ino; struct m_ext2fs *fs; struct inode *ip; struct ufsmount *ump; struct buf *bp; dev_t dev; int error; void *cp; KASSERT(key_len == sizeof(ino)); memcpy(&ino, key, key_len); ump = VFSTOUFS(mp); dev = ump->um_dev; fs = ump->um_e2fs; /* Read in the disk contents for the inode, copy into the inode. */ error = bread(ump->um_devvp, EXT2_FSBTODB(fs, ino_to_fsba(fs, ino)), (int)fs->e2fs_bsize, 0, &bp); if (error) return error; /* Allocate and initialize inode. */ ip = pool_get(&ext2fs_inode_pool, PR_WAITOK); memset(ip, 0, sizeof(struct inode)); vp->v_tag = VT_EXT2FS; vp->v_op = ext2fs_vnodeop_p; vp->v_vflag |= VV_LOCKSWORK; vp->v_data = ip; ip->i_vnode = vp; ip->i_ump = ump; ip->i_e2fs = fs; ip->i_dev = dev; ip->i_number = ino; ip->i_e2fs_last_lblk = 0; ip->i_e2fs_last_blk = 0; /* Initialize genfs node. */ genfs_node_init(vp, &ext2fs_genfsops); cp = (char *)bp->b_data + (ino_to_fsbo(fs, ino) * EXT2_DINODE_SIZE(fs)); ip->i_din.e2fs_din = pool_get(&ext2fs_dinode_pool, PR_WAITOK); e2fs_iload((struct ext2fs_dinode *)cp, ip->i_din.e2fs_din); ext2fs_set_inode_guid(ip); brelse(bp, 0); /* If the inode was deleted, reset all fields */ if (ip->i_e2fs_dtime != 0) { ip->i_e2fs_mode = 0; (void)ext2fs_setsize(ip, 0); (void)ext2fs_setnblock(ip, 0); memset(ip->i_e2fs_blocks, 0, sizeof(ip->i_e2fs_blocks)); } /* Initialize the vnode from the inode. */ ext2fs_vinit(mp, ext2fs_specop_p, ext2fs_fifoop_p, &vp); /* Finish inode initialization. */ ip->i_devvp = ump->um_devvp; vref(ip->i_devvp); /* * Set up a generation number for this inode if it does not * already have one. This should only happen on old filesystems. */ if (ip->i_e2fs_gen == 0) { if (++ext2gennumber < (u_long)time_second) ext2gennumber = time_second; ip->i_e2fs_gen = ext2gennumber; if ((mp->mnt_flag & MNT_RDONLY) == 0) ip->i_flag |= IN_MODIFIED; } uvm_vnp_setsize(vp, ext2fs_size(ip)); *new_key = &ip->i_number; return 0; } /* * File handle to vnode * * Have to be really careful about stale file handles: * - check that the inode number is valid * - call ext2fs_vget() to get the locked inode * - check for an unallocated inode (i_mode == 0) */ int ext2fs_fhtovp(struct mount *mp, struct fid *fhp, struct vnode **vpp) { struct inode *ip; struct vnode *nvp; int error; struct ufid ufh; struct m_ext2fs *fs; if (fhp->fid_len != sizeof(struct ufid)) return EINVAL; memcpy(&ufh, fhp, sizeof(struct ufid)); fs = VFSTOUFS(mp)->um_e2fs; if ((ufh.ufid_ino < EXT2_FIRSTINO && ufh.ufid_ino != EXT2_ROOTINO) || ufh.ufid_ino >= fs->e2fs_ncg * fs->e2fs.e2fs_ipg) return (ESTALE); if ((error = VFS_VGET(mp, ufh.ufid_ino, &nvp)) != 0) { *vpp = NULLVP; return (error); } ip = VTOI(nvp); if (ip->i_e2fs_mode == 0 || ip->i_e2fs_dtime != 0 || ip->i_e2fs_gen != ufh.ufid_gen) { vput(nvp); *vpp = NULLVP; return (ESTALE); } *vpp = nvp; return (0); } /* * Vnode pointer to File handle */ /* ARGSUSED */ int ext2fs_vptofh(struct vnode *vp, struct fid *fhp, size_t *fh_size) { struct inode *ip; struct ufid ufh; if (*fh_size < sizeof(struct ufid)) { *fh_size = sizeof(struct ufid); return E2BIG; } *fh_size = sizeof(struct ufid); ip = VTOI(vp); memset(&ufh, 0, sizeof(ufh)); ufh.ufid_len = sizeof(struct ufid); ufh.ufid_ino = ip->i_number; ufh.ufid_gen = ip->i_e2fs_gen; memcpy(fhp, &ufh, sizeof(ufh)); return (0); } /* * Write a superblock and associated information back to disk. */ int ext2fs_sbupdate(struct ufsmount *mp, int waitfor) { struct m_ext2fs *fs = mp->um_e2fs; struct buf *bp; int error = 0; bp = getblk(mp->um_devvp, SBLOCK, SBSIZE, 0, 0); e2fs_sbsave(&fs->e2fs, (struct ext2fs*)bp->b_data); if (waitfor == MNT_WAIT) error = bwrite(bp); else bawrite(bp); return (error); } int ext2fs_cgupdate(struct ufsmount *mp, int waitfor) { struct m_ext2fs *fs = mp->um_e2fs; struct buf *bp; int i, error = 0, allerror = 0; allerror = ext2fs_sbupdate(mp, waitfor); for (i = 0; i < fs->e2fs_ngdb; i++) { bp = getblk(mp->um_devvp, EXT2_FSBTODB(fs, fs->e2fs.e2fs_first_dblock + 1 /* superblock */ + i), fs->e2fs_bsize, 0, 0); e2fs_cgsave(&fs->e2fs_gd[ i * fs->e2fs_bsize / sizeof(struct ext2_gd)], (struct ext2_gd *)bp->b_data, fs->e2fs_bsize); if (waitfor == MNT_WAIT) error = bwrite(bp); else bawrite(bp); } if (!allerror && error) allerror = error; return (allerror); } /* * Fill in the m_fs structure, and validate the fields of the superblock. * NOTE: here, the superblock is already swapped. */ static int ext2fs_sbfill(struct m_ext2fs *m_fs, int ronly) { uint32_t u32; struct ext2fs *fs = &m_fs->e2fs; /* * General sanity checks */ if (fs->e2fs_magic != E2FS_MAGIC) return EINVAL; if (fs->e2fs_rev > E2FS_REV1) { printf("ext2fs: unsupported revision number: %x\n", fs->e2fs_rev); return EINVAL; } if (fs->e2fs_log_bsize > 2) { /* block size = 1024|2048|4096 */ printf("ext2fs: bad block size: %d\n", fs->e2fs_log_bsize); return EINVAL; } if (fs->e2fs_bpg == 0) { printf("ext2fs: zero blocks per group\n"); return EINVAL; } if (fs->e2fs_ipg == 0) { printf("ext2fs: zero inodes per group\n"); return EINVAL; } if (fs->e2fs_first_dblock >= fs->e2fs_bcount) { printf("ext2fs: invalid first data block\n"); return EINVAL; } if (fs->e2fs_rbcount > fs->e2fs_bcount || fs->e2fs_fbcount > fs->e2fs_bcount) { printf("ext2fs: invalid block count\n"); return EINVAL; } /* * Revision-specific checks */ if (fs->e2fs_rev > E2FS_REV0) { char buf[256]; if (fs->e2fs_first_ino != EXT2_FIRSTINO) { printf("ext2fs: unsupported first inode position\n"); return EINVAL; } u32 = fs->e2fs_features_incompat & ~EXT2F_INCOMPAT_SUPP; if (u32) { snprintb(buf, sizeof(buf), EXT2F_INCOMPAT_BITS, u32); printf("ext2fs: unsupported incompat features: %s\n", buf); return EINVAL; } u32 = fs->e2fs_features_rocompat & ~EXT2F_ROCOMPAT_SUPP; if (!ronly && u32) { snprintb(buf, sizeof(buf), EXT2F_ROCOMPAT_BITS, u32); printf("ext2fs: unsupported ro-incompat features: %s\n", buf); return EROFS; } if (fs->e2fs_inode_size == 0 || !powerof2(fs->e2fs_inode_size)) { printf("ext2fs: bad inode size\n"); return EINVAL; } } /* * Compute the fields of the superblock */ u32 = fs->e2fs_bcount - fs->e2fs_first_dblock; /* > 0 */ m_fs->e2fs_ncg = howmany(u32, fs->e2fs_bpg); if (m_fs->e2fs_ncg == 0) { printf("ext2fs: invalid number of cylinder groups\n"); return EINVAL; } m_fs->e2fs_fsbtodb = fs->e2fs_log_bsize + LOG_MINBSIZE - DEV_BSHIFT; m_fs->e2fs_bsize = MINBSIZE << fs->e2fs_log_bsize; m_fs->e2fs_bshift = LOG_MINBSIZE + fs->e2fs_log_bsize; m_fs->e2fs_qbmask = m_fs->e2fs_bsize - 1; m_fs->e2fs_bmask = ~m_fs->e2fs_qbmask; if ((u32 = m_fs->e2fs_bsize / sizeof(struct ext2_gd)) == 0) { /* Unlikely to happen */ printf("ext2fs: invalid block size\n"); return EINVAL; } m_fs->e2fs_ngdb = howmany(m_fs->e2fs_ncg, u32); if (m_fs->e2fs_ngdb == 0) { printf("ext2fs: invalid number of group descriptor blocks\n"); return EINVAL; } if (m_fs->e2fs_bsize < EXT2_DINODE_SIZE(m_fs)) { printf("ext2fs: invalid inode size\n"); return EINVAL; } m_fs->e2fs_ipb = m_fs->e2fs_bsize / EXT2_DINODE_SIZE(m_fs); m_fs->e2fs_itpg = fs->e2fs_ipg / m_fs->e2fs_ipb; return 0; }