/* $NetBSD: ext2fs_vfsops.c,v 1.162 2011/11/14 18:35:14 hannken 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 1.162 2011/11/14 18:35:14 hannken 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 #include MODULE(MODULE_CLASS_VFS, ext2fs, "ffs"); int ext2fs_sbupdate(struct ufsmount *, int); static int ext2fs_checksb(struct 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 = { MOUNT_EXT2FS, sizeof (struct ufs_args), ext2fs_mount, ufs_start, ext2fs_unmount, ufs_root, ufs_quotactl, ext2fs_statvfs, ext2fs_sync, ext2fs_vget, ext2fs_fhtovp, ext2fs_vptofh, ext2fs_init, ext2fs_reinit, ext2fs_done, ext2fs_mountroot, (int (*)(struct mount *, struct vnode *, struct timespec *)) eopnotsupp, vfs_stdextattrctl, (void *)eopnotsupp, /* vfs_suspendctl */ genfs_renamelock_enter, genfs_renamelock_exit, (void *)eopnotsupp, ext2fs_vnodeopv_descs, 0, { NULL, NULL }, }; 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_vfree = ext2fs_vfree, .uo_unmark_vnode = (void (*)(vnode_t *))nullop, }; /* 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, "vfs", NULL, NULL, 0, NULL, 0, CTL_VFS, CTL_EOL); 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. */ #define ROOTNAME "root_device" 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); } mutex_enter(&mountlist_lock); CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); mutex_exit(&mountlist_lock); 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 (*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 = genfs_can_mount(devvp, accessmode, l->l_cred); 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, *mvp, *devvp; struct inode *ip; struct buf *bp; struct m_ext2fs *fs; struct ext2fs *newfs; int i, error; void *cp; struct ufsmount *ump; 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"); /* * Step 2: re-read superblock from disk. */ error = bread(devvp, SBLOCK, SBSIZE, NOCRED, 0, &bp); if (error) { brelse(bp, 0); return (error); } newfs = (struct ext2fs *)bp->b_data; error = ext2fs_checksb(newfs, (mp->mnt_flag & MNT_RDONLY) != 0); if (error) { brelse(bp, 0); return (error); } fs = ump->um_e2fs; /* * copy in new superblock, and compute in-memory values */ e2fs_sbload(newfs, &fs->e2fs); fs->e2fs_ncg = howmany(fs->e2fs.e2fs_bcount - fs->e2fs.e2fs_first_dblock, fs->e2fs.e2fs_bpg); fs->e2fs_fsbtodb = fs->e2fs.e2fs_log_bsize + LOG_MINBSIZE - DEV_BSHIFT; fs->e2fs_bsize = MINBSIZE << fs->e2fs.e2fs_log_bsize; fs->e2fs_bshift = LOG_MINBSIZE + fs->e2fs.e2fs_log_bsize; fs->e2fs_qbmask = fs->e2fs_bsize - 1; fs->e2fs_bmask = ~fs->e2fs_qbmask; fs->e2fs_ngdb = howmany(fs->e2fs_ncg, fs->e2fs_bsize / sizeof(struct ext2_gd)); fs->e2fs_ipb = fs->e2fs_bsize / EXT2_DINODE_SIZE(fs); fs->e2fs_itpg = fs->e2fs.e2fs_ipg / fs->e2fs_ipb; brelse(bp, 0); /* * Step 3: re-read summary information from disk. */ for (i = 0; i < fs->e2fs_ngdb; i++) { error = bread(devvp , fsbtodb(fs, fs->e2fs.e2fs_first_dblock + 1 /* superblock */ + i), fs->e2fs_bsize, NOCRED, 0, &bp); if (error) { brelse(bp, 0); 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); } /* Allocate a marker vnode. */ mvp = vnalloc(mp); /* * NOTE: not using the TAILQ_FOREACH here since in this loop vgone() * and vclean() can be called indirectly */ mutex_enter(&mntvnode_lock); loop: for (vp = TAILQ_FIRST(&mp->mnt_vnodelist); vp; vp = vunmark(mvp)) { vmark(mvp, vp); if (vp->v_mount != mp || vismarker(vp)) continue; /* * Step 4: invalidate all inactive vnodes. */ if (vrecycle(vp, &mntvnode_lock, l)) { mutex_enter(&mntvnode_lock); (void)vunmark(mvp); goto loop; } /* * Step 5: invalidate all cached file data. */ mutex_enter(vp->v_interlock); mutex_exit(&mntvnode_lock); if (vget(vp, LK_EXCLUSIVE)) { mutex_enter(&mntvnode_lock); (void)vunmark(mvp); goto loop; } 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, fsbtodb(fs, ino_to_fsba(fs, ip->i_number)), (int)fs->e2fs_bsize, NOCRED, 0, &bp); if (error) { vput(vp); mutex_enter(&mntvnode_lock); (void)vunmark(mvp); 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); mutex_enter(&mntvnode_lock); } mutex_exit(&mntvnode_lock); vnfree(mvp); 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; struct proc *p; dev = devvp->v_rdev; p = l ? l->l_proc : NULL; cred = l ? l->l_cred : NOCRED; /* 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; #ifdef DEBUG_EXT2 printf("ext2 sb size: %zu\n", sizeof(struct ext2fs)); #endif error = bread(devvp, SBLOCK, SBSIZE, cred, 0, &bp); if (error) goto out; fs = (struct ext2fs *)bp->b_data; error = ext2fs_checksb(fs, ronly); if (error) goto out; ump = malloc(sizeof(*ump), M_UFSMNT, M_WAITOK); memset(ump, 0, sizeof(*ump)); ump->um_fstype = UFS1; ump->um_ops = &ext2fs_ufsops; ump->um_e2fs = malloc(sizeof(struct m_ext2fs), M_UFSMNT, M_WAITOK); memset(ump->um_e2fs, 0, sizeof(struct m_ext2fs)); e2fs_sbload((struct ext2fs *)bp->b_data, &ump->um_e2fs->e2fs); brelse(bp, 0); bp = NULL; m_fs = ump->um_e2fs; m_fs->e2fs_ronly = ronly; #ifdef DEBUG_EXT2 printf("ext2 ino size %zu\n", EXT2_DINODE_SIZE(m_fs)); #endif 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; } /* compute dynamic sb infos */ m_fs->e2fs_ncg = howmany(m_fs->e2fs.e2fs_bcount - m_fs->e2fs.e2fs_first_dblock, m_fs->e2fs.e2fs_bpg); m_fs->e2fs_fsbtodb = m_fs->e2fs.e2fs_log_bsize + LOG_MINBSIZE - DEV_BSHIFT; m_fs->e2fs_bsize = MINBSIZE << m_fs->e2fs.e2fs_log_bsize; m_fs->e2fs_bshift = LOG_MINBSIZE + m_fs->e2fs.e2fs_log_bsize; m_fs->e2fs_qbmask = m_fs->e2fs_bsize - 1; m_fs->e2fs_bmask = ~m_fs->e2fs_qbmask; m_fs->e2fs_ngdb = howmany(m_fs->e2fs_ncg, m_fs->e2fs_bsize / sizeof(struct ext2_gd)); m_fs->e2fs_ipb = m_fs->e2fs_bsize / EXT2_DINODE_SIZE(m_fs); m_fs->e2fs_itpg = m_fs->e2fs.e2fs_ipg / m_fs->e2fs_ipb; m_fs->e2fs_gd = malloc(m_fs->e2fs_ngdb * m_fs->e2fs_bsize, M_UFSMNT, M_WAITOK); for (i = 0; i < m_fs->e2fs_ngdb; i++) { error = bread(devvp , fsbtodb(m_fs, m_fs->e2fs.e2fs_first_dblock + 1 /* superblock */ + i), m_fs->e2fs_bsize, NOCRED, 0, &bp); if (error) { free(m_fs->e2fs_gd, M_UFSMNT); 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 = NINDIR(m_fs); ump->um_lognindir = ffs(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); devvp->v_specmountpoint = mp; return (0); out: KASSERT(bp != NULL); brelse(bp, 0); if (ump) { free(ump->um_e2fs, M_UFSMNT); free(ump, M_UFSMNT); 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) ump->um_devvp->v_specmountpoint = 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); free(fs->e2fs_gd, M_UFSMNT); free(fs, M_UFSMNT); free(ump, M_UFSMNT); 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); } /* * 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, *mvp; struct inode *ip; struct ufsmount *ump = VFSTOUFS(mp); struct m_ext2fs *fs; 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"); } /* Allocate a marker vnode. */ mvp = vnalloc(mp); /* * Write back each (modified) inode. */ mutex_enter(&mntvnode_lock); loop: /* * NOTE: not using the TAILQ_FOREACH here since in this loop vgone() * and vclean() can be called indirectly */ for (vp = TAILQ_FIRST(&mp->mnt_vnodelist); vp; vp = vunmark(mvp)) { vmark(mvp, vp); if (vp->v_mount != mp || vismarker(vp)) continue; mutex_enter(vp->v_interlock); ip = VTOI(vp); if (ip == NULL || (vp->v_iflag & (VI_XLOCK|VI_CLEAN)) != 0 || vp->v_type == VNON || ((ip->i_flag & (IN_CHANGE | IN_UPDATE | IN_MODIFIED)) == 0 && LIST_EMPTY(&vp->v_dirtyblkhd) && UVM_OBJ_IS_CLEAN(&vp->v_uobj))) { mutex_exit(vp->v_interlock); continue; } mutex_exit(&mntvnode_lock); error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT); if (error) { mutex_enter(&mntvnode_lock); if (error == ENOENT) { mutex_enter(&mntvnode_lock); (void)vunmark(mvp); goto loop; } 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); mutex_enter(&mntvnode_lock); } mutex_exit(&mntvnode_lock); vnfree(mvp); /* * 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); } /* * Look up a EXT2FS dinode number to find its incore vnode, otherwise read it * in from disk. If it is in core, wait for the lock bit to clear, then * return the inode locked. Detection and handling of mount points must be * done by the calling routine. */ int ext2fs_vget(struct mount *mp, ino_t ino, struct vnode **vpp) { struct m_ext2fs *fs; struct inode *ip; struct ufsmount *ump; struct buf *bp; struct vnode *vp; dev_t dev; int error; void *cp; ump = VFSTOUFS(mp); dev = ump->um_dev; retry: if ((*vpp = ufs_ihashget(dev, ino, LK_EXCLUSIVE)) != NULL) return (0); /* Allocate a new vnode/inode. */ error = getnewvnode(VT_EXT2FS, mp, ext2fs_vnodeop_p, NULL, &vp); if (error) { *vpp = NULL; return (error); } ip = pool_get(&ext2fs_inode_pool, PR_WAITOK); mutex_enter(&ufs_hashlock); if ((*vpp = ufs_ihashget(dev, ino, 0)) != NULL) { mutex_exit(&ufs_hashlock); ungetnewvnode(vp); pool_put(&ext2fs_inode_pool, ip); goto retry; } vp->v_vflag |= VV_LOCKSWORK; memset(ip, 0, sizeof(struct inode)); vp->v_data = ip; ip->i_vnode = vp; ip->i_ump = ump; ip->i_e2fs = fs = ump->um_e2fs; ip->i_dev = dev; ip->i_number = ino; ip->i_e2fs_last_lblk = 0; ip->i_e2fs_last_blk = 0; genfs_node_init(vp, &ext2fs_genfsops); /* * Put it onto its hash chain and lock it so that other requests for * this inode will block if they arrive while we are sleeping waiting * for old data structures to be purged or for the contents of the * disk portion of this inode to be read. */ ufs_ihashins(ip); mutex_exit(&ufs_hashlock); /* Read in the disk contents for the inode, copy into the inode. */ error = bread(ump->um_devvp, fsbtodb(fs, ino_to_fsba(fs, ino)), (int)fs->e2fs_bsize, NOCRED, 0, &bp); if (error) { /* * The inode does not contain anything useful, so it would * be misleading to leave it on its hash chain. With mode * still zero, it will be unlinked and returned to the free * list by vput(). */ vput(vp); brelse(bp, 0); *vpp = NULL; return (error); } 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 = ip->i_e2fs_nblock = 0; (void)ext2fs_setsize(ip, 0); memset(ip->i_e2fs_blocks, 0, sizeof(ip->i_e2fs_blocks)); } /* * Initialize the vnode from the inode, check for aliases. */ error = ext2fs_vinit(mp, ext2fs_specop_p, ext2fs_fifoop_p, &vp); if (error) { vput(vp); *vpp = NULL; return (error); } /* * Finish inode initialization now that aliasing has been resolved. */ 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 ((vp->v_mount->mnt_flag & MNT_RDONLY) == 0) ip->i_flag |= IN_MODIFIED; } uvm_vnp_setsize(vp, ext2fs_size(ip)); *vpp = vp; 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, 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); } static int ext2fs_checksb(struct ext2fs *fs, int ronly) { if (fs2h16(fs->e2fs_magic) != E2FS_MAGIC) { return (EINVAL); /* XXX needs translation */ } if (fs2h32(fs->e2fs_rev) > E2FS_REV1) { #ifdef DIAGNOSTIC printf("Ext2 fs: unsupported revision number: %x\n", fs2h32(fs->e2fs_rev)); #endif return (EINVAL); /* XXX needs translation */ } if (fs2h32(fs->e2fs_log_bsize) > 2) { /* block size = 1024|2048|4096 */ #ifdef DIAGNOSTIC printf("Ext2 fs: bad block size: %d " "(expected <= 2 for ext2 fs)\n", fs2h32(fs->e2fs_log_bsize)); #endif return (EINVAL); /* XXX needs translation */ } if (fs2h32(fs->e2fs_rev) > E2FS_REV0) { if (fs2h32(fs->e2fs_first_ino) != EXT2_FIRSTINO) { printf("Ext2 fs: unsupported first inode position\n"); return (EINVAL); /* XXX needs translation */ } if (fs2h32(fs->e2fs_features_incompat) & ~EXT2F_INCOMPAT_SUPP) { printf("Ext2 fs: unsupported optional feature\n"); return (EINVAL); /* XXX needs translation */ } if (!ronly && fs2h32(fs->e2fs_features_rocompat) & ~EXT2F_ROCOMPAT_SUPP) { return (EROFS); /* XXX needs translation */ } } return (0); }