ext2_vfsops.c revision 57839
112115Sdyson/* 212115Sdyson * modified for EXT2FS support in Lites 1.1 312115Sdyson * 412115Sdyson * Aug 1995, Godmar Back (gback@cs.utah.edu) 512115Sdyson * University of Utah, Department of Computer Science 612115Sdyson */ 712115Sdyson/* 812115Sdyson * Copyright (c) 1989, 1991, 1993, 1994 912115Sdyson * The Regents of the University of California. All rights reserved. 1012115Sdyson * 1112115Sdyson * Redistribution and use in source and binary forms, with or without 1212115Sdyson * modification, are permitted provided that the following conditions 1312115Sdyson * are met: 1412115Sdyson * 1. Redistributions of source code must retain the above copyright 1512115Sdyson * notice, this list of conditions and the following disclaimer. 1612115Sdyson * 2. Redistributions in binary form must reproduce the above copyright 1712115Sdyson * notice, this list of conditions and the following disclaimer in the 1812115Sdyson * documentation and/or other materials provided with the distribution. 1912115Sdyson * 3. All advertising materials mentioning features or use of this software 2012115Sdyson * must display the following acknowledgement: 2112115Sdyson * This product includes software developed by the University of 2212115Sdyson * California, Berkeley and its contributors. 2312115Sdyson * 4. Neither the name of the University nor the names of its contributors 2412115Sdyson * may be used to endorse or promote products derived from this software 2512115Sdyson * without specific prior written permission. 2612115Sdyson * 2712115Sdyson * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 2812115Sdyson * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 2912115Sdyson * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 3012115Sdyson * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 3112115Sdyson * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 3212115Sdyson * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 3312115Sdyson * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 3412115Sdyson * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 3512115Sdyson * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 3612115Sdyson * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 3712115Sdyson * SUCH DAMAGE. 3812115Sdyson * 3912115Sdyson * @(#)ffs_vfsops.c 8.8 (Berkeley) 4/18/94 4051138Salfred * $FreeBSD: head/sys/gnu/fs/ext2fs/ext2_vfsops.c 57839 2000-03-09 05:21:10Z bde $ 4112115Sdyson */ 4212115Sdyson 4313260Swollman#include "opt_quota.h" 4412115Sdyson 4512115Sdyson#include <sys/param.h> 4612115Sdyson#include <sys/systm.h> 4712115Sdyson#include <sys/namei.h> 4812115Sdyson#include <sys/proc.h> 4912115Sdyson#include <sys/kernel.h> 5012115Sdyson#include <sys/vnode.h> 5112115Sdyson#include <sys/mount.h> 5212115Sdyson#include <sys/buf.h> 5329906Skato#include <sys/conf.h> 5424131Sbde#include <sys/fcntl.h> 5512115Sdyson#include <sys/disklabel.h> 5612115Sdyson#include <sys/malloc.h> 5712115Sdyson#include <sys/stat.h> 5812115Sdyson 5912115Sdyson#include <ufs/ufs/quota.h> 6012115Sdyson#include <ufs/ufs/ufsmount.h> 6112115Sdyson#include <ufs/ufs/inode.h> 6212115Sdyson#include <ufs/ufs/ufs_extern.h> 6312115Sdyson 6454655Seivind#include <vm/vm_zone.h> 6554655Seivind 6612115Sdyson#include <gnu/ext2fs/fs.h> 6712115Sdyson#include <gnu/ext2fs/ext2_extern.h> 6812115Sdyson#include <gnu/ext2fs/ext2_fs.h> 6912115Sdyson#include <gnu/ext2fs/ext2_fs_sb.h> 7012115Sdyson 7151138Salfredstatic int ext2_fhtovp __P((struct mount *, struct fid *, struct vnode **)); 7212911Sphkstatic int ext2_flushfiles __P((struct mount *mp, int flags, struct proc *p)); 7312911Sphkstatic int ext2_mount __P((struct mount *, 7412911Sphk char *, caddr_t, struct nameidata *, struct proc *)); 7512911Sphkstatic int ext2_mountfs __P((struct vnode *, struct mount *, struct proc *)); 7612911Sphkstatic int ext2_reload __P((struct mount *mountp, struct ucred *cred, 7712911Sphk struct proc *p)); 7812911Sphkstatic int ext2_sbupdate __P((struct ufsmount *, int)); 7912911Sphkstatic int ext2_statfs __P((struct mount *, struct statfs *, struct proc *)); 8012911Sphkstatic int ext2_sync __P((struct mount *, int, struct ucred *, struct proc *)); 8112911Sphkstatic int ext2_unmount __P((struct mount *, int, struct proc *)); 8212911Sphkstatic int ext2_vget __P((struct mount *, ino_t, struct vnode **)); 8312911Sphkstatic int ext2_vptofh __P((struct vnode *, struct fid *)); 8412115Sdyson 8531315Sbdestatic MALLOC_DEFINE(M_EXT2NODE, "EXT2 node", "EXT2 vnode private part"); 8630280Sphk 8712911Sphkstatic struct vfsops ext2fs_vfsops = { 8812115Sdyson ext2_mount, 8912115Sdyson ufs_start, /* empty function */ 9012115Sdyson ext2_unmount, 9112115Sdyson ufs_root, /* root inode via vget */ 9212115Sdyson ufs_quotactl, /* does operations associated with quotas */ 9312115Sdyson ext2_statfs, 9412115Sdyson ext2_sync, 9512115Sdyson ext2_vget, 9612115Sdyson ext2_fhtovp, 9751138Salfred ufs_check_export, 9812115Sdyson ext2_vptofh, 9912115Sdyson ext2_init, 10054803Srwatson vfs_stduninit, 10154803Srwatson vfs_stdextattrctl, 10212115Sdyson}; 10312115Sdyson 10438909SbdeVFS_SET(ext2fs_vfsops, ext2fs, 0); 10512115Sdyson#define bsd_malloc malloc 10612115Sdyson#define bsd_free free 10712115Sdyson 10812911Sphkstatic int ext2fs_inode_hash_lock; 10912115Sdyson 11055313Sbdestatic int ext2_check_sb_compat __P((struct ext2_super_block *es, 11155313Sbde dev_t dev, int ronly)); 11216322Sgpalmerstatic int compute_sb_data __P((struct vnode * devvp, 11316322Sgpalmer struct ext2_super_block * es, 11416322Sgpalmer struct ext2_sb_info * fs)); 11516322Sgpalmer 11616322Sgpalmer#ifdef notyet 11716322Sgpalmerstatic int ext2_mountroot __P((void)); 11816322Sgpalmer 11912115Sdyson/* 12016322Sgpalmer * Called by main() when ext2fs is going to be mounted as root. 12112115Sdyson * 12212115Sdyson * Name is updated by mount(8) after booting. 12312115Sdyson */ 12412115Sdyson#define ROOTNAME "root_device" 12512115Sdyson 12612911Sphkstatic int 12712115Sdysonext2_mountroot() 12812115Sdyson{ 12912115Sdyson register struct ext2_sb_info *fs; 13012115Sdyson register struct mount *mp; 13112115Sdyson struct proc *p = curproc; 13212115Sdyson struct ufsmount *ump; 13312115Sdyson u_int size; 13412115Sdyson int error; 13512115Sdyson 13629208Sbde if ((error = bdevvp(rootdev, &rootvp))) { 13752782Smsmith printf("ext2_mountroot: can't find rootvp\n"); 13829208Sbde return (error); 13929208Sbde } 14012115Sdyson mp = bsd_malloc((u_long)sizeof(struct mount), M_MOUNT, M_WAITOK); 14112115Sdyson bzero((char *)mp, (u_long)sizeof(struct mount)); 14212115Sdyson mp->mnt_op = &ext2fs_vfsops; 14312115Sdyson mp->mnt_flag = MNT_RDONLY; 14412115Sdyson if (error = ext2_mountfs(rootvp, mp, p)) { 14512115Sdyson bsd_free(mp, M_MOUNT); 14612115Sdyson return (error); 14712115Sdyson } 14812115Sdyson if (error = vfs_lock(mp)) { 14912115Sdyson (void)ext2_unmount(mp, 0, p); 15012115Sdyson bsd_free(mp, M_MOUNT); 15112115Sdyson return (error); 15212115Sdyson } 15353452Sphk TAILQ_INSERT_HEAD(&mountlist, mp, mnt_list); 15412115Sdyson mp->mnt_flag |= MNT_ROOTFS; 15512115Sdyson mp->mnt_vnodecovered = NULLVP; 15612115Sdyson ump = VFSTOUFS(mp); 15712115Sdyson fs = ump->um_e2fs; 15812115Sdyson bzero(fs->fs_fsmnt, sizeof(fs->fs_fsmnt)); 15912115Sdyson fs->fs_fsmnt[0] = '/'; 16012115Sdyson bcopy((caddr_t)fs->fs_fsmnt, (caddr_t)mp->mnt_stat.f_mntonname, 16112115Sdyson MNAMELEN); 16212115Sdyson (void) copystr(ROOTNAME, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 16312115Sdyson &size); 16412115Sdyson bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 16512115Sdyson (void)ext2_statfs(mp, &mp->mnt_stat, p); 16612115Sdyson vfs_unlock(mp); 16712115Sdyson inittodr(fs->s_es->s_wtime); /* this helps to set the time */ 16812115Sdyson return (0); 16912115Sdyson} 17016322Sgpalmer#endif 17112115Sdyson 17212115Sdyson/* 17312115Sdyson * VFS Operations. 17412115Sdyson * 17512115Sdyson * mount system call 17612115Sdyson */ 17712911Sphkstatic int 17812115Sdysonext2_mount(mp, path, data, ndp, p) 17912115Sdyson register struct mount *mp; 18012115Sdyson char *path; 18112115Sdyson caddr_t data; /* this is actually a (struct ufs_args *) */ 18212115Sdyson struct nameidata *ndp; 18312115Sdyson struct proc *p; 18412115Sdyson{ 18512115Sdyson struct vnode *devvp; 18612115Sdyson struct ufs_args args; 18712115Sdyson struct ufsmount *ump = 0; 18812115Sdyson register struct ext2_sb_info *fs; 18912115Sdyson u_int size; 19012115Sdyson int error, flags; 19139028Sbde mode_t accessmode; 19212115Sdyson 19343301Sdillon if ((error = copyin(data, (caddr_t)&args, sizeof (struct ufs_args))) != 0) 19412115Sdyson return (error); 19512115Sdyson /* 19612115Sdyson * If updating, check whether changing from read-only to 19712115Sdyson * read/write; if there is no device name, that's all we do. 19812115Sdyson */ 19912115Sdyson if (mp->mnt_flag & MNT_UPDATE) { 20012115Sdyson ump = VFSTOUFS(mp); 20112115Sdyson fs = ump->um_e2fs; 20212115Sdyson error = 0; 20312115Sdyson if (fs->s_rd_only == 0 && (mp->mnt_flag & MNT_RDONLY)) { 20412115Sdyson flags = WRITECLOSE; 20512115Sdyson if (mp->mnt_flag & MNT_FORCE) 20612115Sdyson flags |= FORCECLOSE; 20722521Sdyson if (vfs_busy(mp, LK_NOWAIT, 0, p)) 20812115Sdyson return (EBUSY); 20912115Sdyson error = ext2_flushfiles(mp, flags, p); 21022521Sdyson vfs_unbusy(mp, p); 21139670Sbde if (!error && fs->s_wasvalid) { 21239670Sbde fs->s_es->s_state |= EXT2_VALID_FS; 21339670Sbde ext2_sbupdate(ump, MNT_WAIT); 21439670Sbde } 21539670Sbde fs->s_rd_only = 1; 21612115Sdyson } 21712115Sdyson if (!error && (mp->mnt_flag & MNT_RELOAD)) 21812115Sdyson error = ext2_reload(mp, ndp->ni_cnd.cn_cred, p); 21912115Sdyson if (error) 22012115Sdyson return (error); 22157839Sbde devvp = ump->um_devvp; 22257839Sbde if (ext2_check_sb_compat(fs->s_es, devvp->v_rdev, 22357839Sbde (mp->mnt_kern_flag & MNTK_WANTRDWR) == 0) != 0) 22457839Sbde return (EPERM); 22539028Sbde if (fs->s_rd_only && (mp->mnt_kern_flag & MNTK_WANTRDWR)) { 22639028Sbde /* 22739028Sbde * If upgrade to read-write by non-root, then verify 22839028Sbde * that user has necessary permissions on the device. 22939028Sbde */ 23039028Sbde if (p->p_ucred->cr_uid != 0) { 23139028Sbde vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, p); 23243301Sdillon if ((error = VOP_ACCESS(devvp, VREAD | VWRITE, 23343301Sdillon p->p_ucred, p)) != 0) { 23439028Sbde VOP_UNLOCK(devvp, 0, p); 23539028Sbde return (error); 23639028Sbde } 23739028Sbde VOP_UNLOCK(devvp, 0, p); 23839028Sbde } 23939028Sbde 24039670Sbde if ((fs->s_es->s_state & EXT2_VALID_FS) == 0 || 24139670Sbde (fs->s_es->s_state & EXT2_ERROR_FS)) { 24239670Sbde if (mp->mnt_flag & MNT_FORCE) { 24339670Sbde printf( 24439670Sbde"WARNING: %s was not properly dismounted\n", 24539670Sbde fs->fs_fsmnt); 24639670Sbde } else { 24739670Sbde printf( 24839670Sbde"WARNING: R/W mount of %s denied. Filesystem is not clean - run fsck\n", 24939670Sbde fs->fs_fsmnt); 25039670Sbde return (EPERM); 25139670Sbde } 25239670Sbde } 25312115Sdyson fs->s_es->s_state &= ~EXT2_VALID_FS; 25412115Sdyson ext2_sbupdate(ump, MNT_WAIT); 25539670Sbde fs->s_rd_only = 0; 25612115Sdyson } 25712115Sdyson if (args.fspec == 0) { 25812115Sdyson /* 25912115Sdyson * Process export requests. 26012115Sdyson */ 26112115Sdyson return (vfs_export(mp, &ump->um_export, &args.export)); 26212115Sdyson } 26312115Sdyson } 26412115Sdyson /* 26512115Sdyson * Not an update, or updating the name: look up the name 26612115Sdyson * and verify that it refers to a sensible block device. 26712115Sdyson */ 26812115Sdyson NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, args.fspec, p); 26943301Sdillon if ((error = namei(ndp)) != 0) 27012115Sdyson return (error); 27154655Seivind NDFREE(ndp, NDF_ONLY_PNBUF); 27212115Sdyson devvp = ndp->ni_vp; 27312115Sdyson 27455756Sphk if (!vn_isdisk(devvp, &error)) { 27512115Sdyson vrele(devvp); 27655756Sphk return (error); 27712115Sdyson } 27839028Sbde 27939028Sbde /* 28039028Sbde * If mount by non-root, then verify that user has necessary 28139028Sbde * permissions on the device. 28239028Sbde */ 28339028Sbde if (p->p_ucred->cr_uid != 0) { 28439028Sbde accessmode = VREAD; 28539028Sbde if ((mp->mnt_flag & MNT_RDONLY) == 0) 28639028Sbde accessmode |= VWRITE; 28739028Sbde vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, p); 28843301Sdillon if ((error = VOP_ACCESS(devvp, accessmode, p->p_ucred, p)) != 0) { 28939028Sbde vput(devvp); 29039028Sbde return (error); 29139028Sbde } 29239028Sbde VOP_UNLOCK(devvp, 0, p); 29339028Sbde } 29439028Sbde 29529888Skato if ((mp->mnt_flag & MNT_UPDATE) == 0) { 29612115Sdyson error = ext2_mountfs(devvp, mp, p); 29729888Skato } else { 29812115Sdyson if (devvp != ump->um_devvp) 29912115Sdyson error = EINVAL; /* needs translation */ 30012115Sdyson else 30112115Sdyson vrele(devvp); 30212115Sdyson } 30312115Sdyson if (error) { 30412115Sdyson vrele(devvp); 30512115Sdyson return (error); 30612115Sdyson } 30712115Sdyson ump = VFSTOUFS(mp); 30812115Sdyson fs = ump->um_e2fs; 30912115Sdyson (void) copyinstr(path, fs->fs_fsmnt, sizeof(fs->fs_fsmnt) - 1, &size); 31012115Sdyson bzero(fs->fs_fsmnt + size, sizeof(fs->fs_fsmnt) - size); 31112115Sdyson bcopy((caddr_t)fs->fs_fsmnt, (caddr_t)mp->mnt_stat.f_mntonname, 31212115Sdyson MNAMELEN); 31312115Sdyson (void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 31412115Sdyson &size); 31512115Sdyson bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 31612115Sdyson (void)ext2_statfs(mp, &mp->mnt_stat, p); 31712115Sdyson return (0); 31812115Sdyson} 31912115Sdyson 32012115Sdyson/* 32112115Sdyson * checks that the data in the descriptor blocks make sense 32212115Sdyson * this is taken from ext2/super.c 32312115Sdyson */ 32412115Sdysonstatic int ext2_check_descriptors (struct ext2_sb_info * sb) 32512115Sdyson{ 32612115Sdyson int i; 32712115Sdyson int desc_block = 0; 32812115Sdyson unsigned long block = sb->s_es->s_first_data_block; 32912115Sdyson struct ext2_group_desc * gdp = NULL; 33012115Sdyson 33112115Sdyson /* ext2_debug ("Checking group descriptors"); */ 33212115Sdyson 33312115Sdyson for (i = 0; i < sb->s_groups_count; i++) 33412115Sdyson { 33512115Sdyson /* examine next descriptor block */ 33612115Sdyson if ((i % EXT2_DESC_PER_BLOCK(sb)) == 0) 33712115Sdyson gdp = (struct ext2_group_desc *) 33812115Sdyson sb->s_group_desc[desc_block++]->b_data; 33912115Sdyson if (gdp->bg_block_bitmap < block || 34012115Sdyson gdp->bg_block_bitmap >= block + EXT2_BLOCKS_PER_GROUP(sb)) 34112115Sdyson { 34212115Sdyson printf ("ext2_check_descriptors: " 34312115Sdyson "Block bitmap for group %d" 34439671Sbde " not in group (block %lu)!\n", 34512115Sdyson i, (unsigned long) gdp->bg_block_bitmap); 34612115Sdyson return 0; 34712115Sdyson } 34812115Sdyson if (gdp->bg_inode_bitmap < block || 34912115Sdyson gdp->bg_inode_bitmap >= block + EXT2_BLOCKS_PER_GROUP(sb)) 35012115Sdyson { 35112115Sdyson printf ("ext2_check_descriptors: " 35212115Sdyson "Inode bitmap for group %d" 35339671Sbde " not in group (block %lu)!\n", 35412115Sdyson i, (unsigned long) gdp->bg_inode_bitmap); 35512115Sdyson return 0; 35612115Sdyson } 35712115Sdyson if (gdp->bg_inode_table < block || 35812115Sdyson gdp->bg_inode_table + sb->s_itb_per_group >= 35912115Sdyson block + EXT2_BLOCKS_PER_GROUP(sb)) 36012115Sdyson { 36112115Sdyson printf ("ext2_check_descriptors: " 36212115Sdyson "Inode table for group %d" 36339671Sbde " not in group (block %lu)!\n", 36412115Sdyson i, (unsigned long) gdp->bg_inode_table); 36512115Sdyson return 0; 36612115Sdyson } 36712115Sdyson block += EXT2_BLOCKS_PER_GROUP(sb); 36812115Sdyson gdp++; 36912115Sdyson } 37012115Sdyson return 1; 37112115Sdyson} 37212115Sdyson 37355313Sbdestatic int 37455313Sbdeext2_check_sb_compat(es, dev, ronly) 37555313Sbde struct ext2_super_block *es; 37655313Sbde dev_t dev; 37755313Sbde int ronly; 37855313Sbde{ 37955313Sbde 38055313Sbde if (es->s_magic != EXT2_SUPER_MAGIC) { 38155313Sbde printf("ext2fs: %s: wrong magic number %#x (expected %#x)\n", 38255313Sbde devtoname(dev), es->s_magic, EXT2_SUPER_MAGIC); 38355313Sbde return (1); 38455313Sbde } 38555313Sbde if (es->s_rev_level > EXT2_GOOD_OLD_REV) { 38655313Sbde if (es->s_feature_incompat & ~EXT2_FEATURE_INCOMPAT_SUPP) { 38755313Sbde printf( 38855313Sbde"WARNING: mount of %s denied due to unsupported optional features\n", 38955313Sbde devtoname(dev)); 39055313Sbde return (1); 39155313Sbde } 39255313Sbde if (!ronly && 39355313Sbde (es->s_feature_ro_compat & ~EXT2_FEATURE_RO_COMPAT_SUPP)) { 39455313Sbde printf( 39555313Sbde"WARNING: R/W mount of %s denied due to unsupported optional features\n", 39655313Sbde devtoname(dev)); 39755313Sbde return (1); 39855313Sbde } 39955313Sbde } 40055313Sbde return (0); 40155313Sbde} 40255313Sbde 40312115Sdyson/* 40412115Sdyson * this computes the fields of the ext2_sb_info structure from the 40512115Sdyson * data in the ext2_super_block structure read in 40612115Sdyson */ 40712115Sdysonstatic int compute_sb_data(devvp, es, fs) 40812115Sdyson struct vnode * devvp; 40912115Sdyson struct ext2_super_block * es; 41012115Sdyson struct ext2_sb_info * fs; 41112115Sdyson{ 41212115Sdyson int db_count, error; 41312115Sdyson int i, j; 41412115Sdyson int logic_sb_block = 1; /* XXX for now */ 41512115Sdyson 41612115Sdyson#if 1 41712115Sdyson#define V(v) 41812115Sdyson#else 41912115Sdyson#define V(v) printf(#v"= %d\n", fs->v); 42012115Sdyson#endif 42112115Sdyson 42212115Sdyson fs->s_blocksize = EXT2_MIN_BLOCK_SIZE << es->s_log_block_size; 42312115Sdyson V(s_blocksize) 42412115Sdyson fs->s_bshift = EXT2_MIN_BLOCK_LOG_SIZE + es->s_log_block_size; 42512115Sdyson V(s_bshift) 42612115Sdyson fs->s_fsbtodb = es->s_log_block_size + 1; 42712115Sdyson V(s_fsbtodb) 42812115Sdyson fs->s_qbmask = fs->s_blocksize - 1; 42912115Sdyson V(s_bmask) 43012115Sdyson fs->s_blocksize_bits = EXT2_BLOCK_SIZE_BITS(es); 43112115Sdyson V(s_blocksize_bits) 43212115Sdyson fs->s_frag_size = EXT2_MIN_FRAG_SIZE << es->s_log_frag_size; 43312115Sdyson V(s_frag_size) 43412115Sdyson if (fs->s_frag_size) 43512115Sdyson fs->s_frags_per_block = fs->s_blocksize / fs->s_frag_size; 43612115Sdyson V(s_frags_per_block) 43712115Sdyson fs->s_blocks_per_group = es->s_blocks_per_group; 43812115Sdyson V(s_blocks_per_group) 43912115Sdyson fs->s_frags_per_group = es->s_frags_per_group; 44012115Sdyson V(s_frags_per_group) 44112115Sdyson fs->s_inodes_per_group = es->s_inodes_per_group; 44212115Sdyson V(s_inodes_per_group) 44312115Sdyson fs->s_inodes_per_block = fs->s_blocksize / EXT2_INODE_SIZE; 44412115Sdyson V(s_inodes_per_block) 44512115Sdyson fs->s_itb_per_group = fs->s_inodes_per_group /fs->s_inodes_per_block; 44612115Sdyson V(s_itb_per_group) 44712115Sdyson fs->s_desc_per_block = fs->s_blocksize / sizeof (struct ext2_group_desc); 44812115Sdyson V(s_desc_per_block) 44912115Sdyson /* s_resuid / s_resgid ? */ 45012115Sdyson fs->s_groups_count = (es->s_blocks_count - 45112115Sdyson es->s_first_data_block + 45212115Sdyson EXT2_BLOCKS_PER_GROUP(fs) - 1) / 45312115Sdyson EXT2_BLOCKS_PER_GROUP(fs); 45412115Sdyson V(s_groups_count) 45512115Sdyson db_count = (fs->s_groups_count + EXT2_DESC_PER_BLOCK(fs) - 1) / 45612115Sdyson EXT2_DESC_PER_BLOCK(fs); 45712115Sdyson fs->s_db_per_group = db_count; 45812115Sdyson V(s_db_per_group) 45912115Sdyson 46012115Sdyson fs->s_group_desc = bsd_malloc(db_count * sizeof (struct buf *), 46112115Sdyson M_UFSMNT, M_WAITOK); 46212115Sdyson 46312115Sdyson /* adjust logic_sb_block */ 46412115Sdyson if(fs->s_blocksize > SBSIZE) 46512115Sdyson /* Godmar thinks: if the blocksize is greater than 1024, then 46612115Sdyson the superblock is logically part of block zero. 46712115Sdyson */ 46812115Sdyson logic_sb_block = 0; 46912115Sdyson 47012115Sdyson for (i = 0; i < db_count; i++) { 47112115Sdyson error = bread(devvp , fsbtodb(fs, logic_sb_block + i + 1), 47212115Sdyson fs->s_blocksize, NOCRED, &fs->s_group_desc[i]); 47312115Sdyson if(error) { 47412115Sdyson for (j = 0; j < i; j++) 47512115Sdyson brelse(fs->s_group_desc[j]); 47612115Sdyson bsd_free(fs->s_group_desc, M_UFSMNT); 47712115Sdyson printf("EXT2-fs: unable to read group descriptors (%d)\n", error); 47812115Sdyson return EIO; 47912115Sdyson } 48027881Sdyson /* Set the B_LOCKED flag on the buffer, then brelse() it */ 48127881Sdyson LCK_BUF(fs->s_group_desc[i]) 48212115Sdyson } 48312115Sdyson if(!ext2_check_descriptors(fs)) { 48412115Sdyson for (j = 0; j < db_count; j++) 48527881Sdyson ULCK_BUF(fs->s_group_desc[j]) 48612115Sdyson bsd_free(fs->s_group_desc, M_UFSMNT); 48712115Sdyson printf("EXT2-fs: (ext2_check_descriptors failure) " 48812115Sdyson "unable to read group descriptors\n"); 48912115Sdyson return EIO; 49012115Sdyson } 49112115Sdyson 49212115Sdyson for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++) { 49312115Sdyson fs->s_inode_bitmap_number[i] = 0; 49412115Sdyson fs->s_inode_bitmap[i] = NULL; 49512115Sdyson fs->s_block_bitmap_number[i] = 0; 49612115Sdyson fs->s_block_bitmap[i] = NULL; 49712115Sdyson } 49812115Sdyson fs->s_loaded_inode_bitmaps = 0; 49912115Sdyson fs->s_loaded_block_bitmaps = 0; 50012115Sdyson return 0; 50112115Sdyson} 50212115Sdyson 50312115Sdyson/* 50412115Sdyson * Reload all incore data for a filesystem (used after running fsck on 50512115Sdyson * the root filesystem and finding things to fix). The filesystem must 50612115Sdyson * be mounted read-only. 50712115Sdyson * 50812115Sdyson * Things to do to update the mount: 50912115Sdyson * 1) invalidate all cached meta-data. 51012115Sdyson * 2) re-read superblock from disk. 51112115Sdyson * 3) re-read summary information from disk. 51212115Sdyson * 4) invalidate all inactive vnodes. 51312115Sdyson * 5) invalidate all cached file data. 51412115Sdyson * 6) re-read inode data for all active vnodes. 51512115Sdyson */ 51612911Sphkstatic int 51712115Sdysonext2_reload(mountp, cred, p) 51812115Sdyson register struct mount *mountp; 51912115Sdyson struct ucred *cred; 52012115Sdyson struct proc *p; 52112115Sdyson{ 52212115Sdyson register struct vnode *vp, *nvp, *devvp; 52312115Sdyson struct inode *ip; 52412115Sdyson struct buf *bp; 52512115Sdyson struct ext2_super_block * es; 52612115Sdyson struct ext2_sb_info *fs; 52712147Sdyson int error; 52812115Sdyson 52912115Sdyson if ((mountp->mnt_flag & MNT_RDONLY) == 0) 53012115Sdyson return (EINVAL); 53112115Sdyson /* 53212115Sdyson * Step 1: invalidate all cached meta-data. 53312115Sdyson */ 53412115Sdyson devvp = VFSTOUFS(mountp)->um_devvp; 53512115Sdyson if (vinvalbuf(devvp, 0, cred, p, 0, 0)) 53612115Sdyson panic("ext2_reload: dirty1"); 53712115Sdyson /* 53812115Sdyson * Step 2: re-read superblock from disk. 53912115Sdyson * constants have been adjusted for ext2 54012115Sdyson */ 54143301Sdillon if ((error = bread(devvp, SBLOCK, SBSIZE, NOCRED, &bp)) != 0) 54212115Sdyson return (error); 54312115Sdyson es = (struct ext2_super_block *)bp->b_data; 54455313Sbde if (ext2_check_sb_compat(es, devvp->v_rdev, 0) != 0) { 54512115Sdyson brelse(bp); 54612115Sdyson return (EIO); /* XXX needs translation */ 54712115Sdyson } 54812115Sdyson fs = VFSTOUFS(mountp)->um_e2fs; 54912115Sdyson bcopy(bp->b_data, fs->s_es, sizeof(struct ext2_super_block)); 55012115Sdyson 55143301Sdillon if((error = compute_sb_data(devvp, es, fs)) != 0) { 55212115Sdyson brelse(bp); 55312115Sdyson return error; 55412115Sdyson } 55512115Sdyson#ifdef UNKLAR 55612115Sdyson if (fs->fs_sbsize < SBSIZE) 55712115Sdyson bp->b_flags |= B_INVAL; 55812115Sdyson#endif 55912115Sdyson brelse(bp); 56012115Sdyson 56112115Sdysonloop: 56239678Sbde simple_lock(&mntvnode_slock); 56312115Sdyson for (vp = mountp->mnt_vnodelist.lh_first; vp != NULL; vp = nvp) { 56439678Sbde if (vp->v_mount != mountp) { 56539678Sbde simple_unlock(&mntvnode_slock); 56639678Sbde goto loop; 56739678Sbde } 56812115Sdyson nvp = vp->v_mntvnodes.le_next; 56912115Sdyson /* 57012115Sdyson * Step 4: invalidate all inactive vnodes. 57112115Sdyson */ 57239678Sbde if (vrecycle(vp, &mntvnode_slock, p)) 57339678Sbde goto loop; 57412115Sdyson /* 57512115Sdyson * Step 5: invalidate all cached file data. 57612115Sdyson */ 57739678Sbde simple_lock(&vp->v_interlock); 57839678Sbde simple_unlock(&mntvnode_slock); 57939678Sbde if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, p)) { 58012115Sdyson goto loop; 58139678Sbde } 58212115Sdyson if (vinvalbuf(vp, 0, cred, p, 0, 0)) 58312115Sdyson panic("ext2_reload: dirty2"); 58412115Sdyson /* 58512115Sdyson * Step 6: re-read inode data for all active vnodes. 58612115Sdyson */ 58712115Sdyson ip = VTOI(vp); 58839678Sbde error = 58912115Sdyson bread(devvp, fsbtodb(fs, ino_to_fsba(fs, ip->i_number)), 59039678Sbde (int)fs->s_blocksize, NOCRED, &bp); 59139678Sbde if (error) { 59212115Sdyson vput(vp); 59312115Sdyson return (error); 59412115Sdyson } 59512115Sdyson ext2_ei2di((struct ext2_inode *) ((char *)bp->b_data + 59639678Sbde EXT2_INODE_SIZE * ino_to_fsbo(fs, ip->i_number)), 59739678Sbde &ip->i_din); 59812115Sdyson brelse(bp); 59912115Sdyson vput(vp); 60039678Sbde simple_lock(&mntvnode_slock); 60112115Sdyson } 60239678Sbde simple_unlock(&mntvnode_slock); 60312115Sdyson return (0); 60412115Sdyson} 60512115Sdyson 60612115Sdyson/* 60712115Sdyson * Common code for mount and mountroot 60812115Sdyson */ 60912911Sphkstatic int 61012115Sdysonext2_mountfs(devvp, mp, p) 61112115Sdyson register struct vnode *devvp; 61212115Sdyson struct mount *mp; 61312115Sdyson struct proc *p; 61412115Sdyson{ 61512115Sdyson register struct ufsmount *ump; 61612115Sdyson struct buf *bp; 61712115Sdyson register struct ext2_sb_info *fs; 61812115Sdyson struct ext2_super_block * es; 61912115Sdyson dev_t dev = devvp->v_rdev; 62012115Sdyson struct partinfo dpart; 62112115Sdyson int havepart = 0; 62212115Sdyson int error, i, size; 62312115Sdyson int ronly; 62412115Sdyson 62512115Sdyson /* 62612115Sdyson * Disallow multiple mounts of the same device. 62712115Sdyson * Disallow mounting of a device that is currently in use 62812115Sdyson * (except for root, which might share swap device for miniroot). 62912115Sdyson * Flush out any old buffers remaining from a previous use. 63012115Sdyson */ 63143301Sdillon if ((error = vfs_mountedon(devvp)) != 0) 63212115Sdyson return (error); 63312115Sdyson if (vcount(devvp) > 1 && devvp != rootvp) 63412115Sdyson return (EBUSY); 63543301Sdillon if ((error = vinvalbuf(devvp, V_SAVE, p->p_ucred, p, 0, 0)) != 0) 63612115Sdyson return (error); 63712115Sdyson#ifdef READONLY 63812115Sdyson/* turn on this to force it to be read-only */ 63912115Sdyson mp->mnt_flag |= MNT_RDONLY; 64012115Sdyson#endif 64112115Sdyson 64212115Sdyson ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 64353059Sphk vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, p); 64453059Sphk error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, p); 64553059Sphk VOP_UNLOCK(devvp, 0, p); 64653059Sphk if (error) 64712115Sdyson return (error); 64812115Sdyson if (VOP_IOCTL(devvp, DIOCGPART, (caddr_t)&dpart, FREAD, NOCRED, p) != 0) 64912115Sdyson size = DEV_BSIZE; 65012115Sdyson else { 65112115Sdyson havepart = 1; 65212115Sdyson size = dpart.disklab->d_secsize; 65312115Sdyson } 65412115Sdyson 65512115Sdyson bp = NULL; 65612115Sdyson ump = NULL; 65743301Sdillon if ((error = bread(devvp, SBLOCK, SBSIZE, NOCRED, &bp)) != 0) 65812115Sdyson goto out; 65912115Sdyson es = (struct ext2_super_block *)bp->b_data; 66055313Sbde if (ext2_check_sb_compat(es, dev, ronly) != 0) { 66112115Sdyson error = EINVAL; /* XXX needs translation */ 66212115Sdyson goto out; 66312115Sdyson } 66439670Sbde if ((es->s_state & EXT2_VALID_FS) == 0 || 66539670Sbde (es->s_state & EXT2_ERROR_FS)) { 66639670Sbde if (ronly || (mp->mnt_flag & MNT_FORCE)) { 66739670Sbde printf( 66839670Sbde"WARNING: Filesystem was not properly dismounted\n"); 66939670Sbde } else { 67039670Sbde printf( 67139670Sbde"WARNING: R/W mount denied. Filesystem is not clean - run fsck\n"); 67239670Sbde error = EPERM; 67339670Sbde goto out; 67439670Sbde } 67539670Sbde } 67612115Sdyson ump = bsd_malloc(sizeof *ump, M_UFSMNT, M_WAITOK); 67712115Sdyson bzero((caddr_t)ump, sizeof *ump); 67830280Sphk ump->um_malloctype = M_EXT2NODE; 67930474Sphk ump->um_blkatoff = ext2_blkatoff; 68030474Sphk ump->um_truncate = ext2_truncate; 68130492Sphk ump->um_update = ext2_update; 68230474Sphk ump->um_valloc = ext2_valloc; 68330474Sphk ump->um_vfree = ext2_vfree; 68412115Sdyson /* I don't know whether this is the right strategy. Note that 68512115Sdyson we dynamically allocate both a ext2_sb_info and a ext2_super_block 68612115Sdyson while Linux keeps the super block in a locked buffer 68712115Sdyson */ 68812115Sdyson ump->um_e2fs = bsd_malloc(sizeof(struct ext2_sb_info), 68912115Sdyson M_UFSMNT, M_WAITOK); 69012115Sdyson ump->um_e2fs->s_es = bsd_malloc(sizeof(struct ext2_super_block), 69112115Sdyson M_UFSMNT, M_WAITOK); 69212115Sdyson bcopy(es, ump->um_e2fs->s_es, (u_int)sizeof(struct ext2_super_block)); 69339671Sbde if ((error = compute_sb_data(devvp, ump->um_e2fs->s_es, ump->um_e2fs))) 69439671Sbde goto out; 69539671Sbde /* 69639671Sbde * We don't free the group descriptors allocated by compute_sb_data() 69739671Sbde * until ext2_unmount(). This is OK since the mount will succeed. 69839671Sbde */ 69912115Sdyson brelse(bp); 70012115Sdyson bp = NULL; 70112115Sdyson fs = ump->um_e2fs; 70212115Sdyson fs->s_rd_only = ronly; /* ronly is set according to mnt_flags */ 70312115Sdyson /* if the fs is not mounted read-only, make sure the super block is 70412115Sdyson always written back on a sync() 70512115Sdyson */ 70639670Sbde fs->s_wasvalid = fs->s_es->s_state & EXT2_VALID_FS ? 1 : 0; 70712115Sdyson if (ronly == 0) { 70812115Sdyson fs->s_dirt = 1; /* mark it modified */ 70912115Sdyson fs->s_es->s_state &= ~EXT2_VALID_FS; /* set fs invalid */ 71012115Sdyson } 71112115Sdyson mp->mnt_data = (qaddr_t)ump; 71250256Sbde mp->mnt_stat.f_fsid.val[0] = dev2udev(dev); 71338909Sbde mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum; 71412115Sdyson mp->mnt_maxsymlinklen = EXT2_MAXSYMLINKLEN; 71512115Sdyson mp->mnt_flag |= MNT_LOCAL; 71612115Sdyson ump->um_mountp = mp; 71712115Sdyson ump->um_dev = dev; 71812115Sdyson ump->um_devvp = devvp; 71912115Sdyson /* setting those two parameters allows us to use 72012115Sdyson ufs_bmap w/o changse ! 72112115Sdyson */ 72212115Sdyson ump->um_nindir = EXT2_ADDR_PER_BLOCK(fs); 72312115Sdyson ump->um_bptrtodb = fs->s_es->s_log_block_size + 1; 72412115Sdyson ump->um_seqinc = EXT2_FRAGS_PER_BLOCK(fs); 72512115Sdyson for (i = 0; i < MAXQUOTAS; i++) 72612115Sdyson ump->um_quotas[i] = NULLVP; 72734430Seivind devvp->v_specmountpoint = mp; 72834430Seivind if (ronly == 0) 72934430Seivind ext2_sbupdate(ump, MNT_WAIT); 73012115Sdyson return (0); 73112115Sdysonout: 73212115Sdyson if (bp) 73312115Sdyson brelse(bp); 73412115Sdyson (void)VOP_CLOSE(devvp, ronly ? FREAD : FREAD|FWRITE, NOCRED, p); 73512115Sdyson if (ump) { 73639671Sbde bsd_free(ump->um_e2fs->s_es, M_UFSMNT); 73739671Sbde bsd_free(ump->um_e2fs, M_UFSMNT); 73812115Sdyson bsd_free(ump, M_UFSMNT); 73912115Sdyson mp->mnt_data = (qaddr_t)0; 74012115Sdyson } 74112115Sdyson return (error); 74212115Sdyson} 74312115Sdyson 74412115Sdyson/* 74512115Sdyson * unmount system call 74612115Sdyson */ 74712911Sphkstatic int 74812115Sdysonext2_unmount(mp, mntflags, p) 74912115Sdyson struct mount *mp; 75012115Sdyson int mntflags; 75112115Sdyson struct proc *p; 75212115Sdyson{ 75312115Sdyson register struct ufsmount *ump; 75412115Sdyson register struct ext2_sb_info *fs; 75512115Sdyson int error, flags, ronly, i; 75612115Sdyson 75712115Sdyson flags = 0; 75812115Sdyson if (mntflags & MNT_FORCE) { 75912115Sdyson if (mp->mnt_flag & MNT_ROOTFS) 76012115Sdyson return (EINVAL); 76112115Sdyson flags |= FORCECLOSE; 76212115Sdyson } 76343301Sdillon if ((error = ext2_flushfiles(mp, flags, p)) != 0) 76412115Sdyson return (error); 76512115Sdyson ump = VFSTOUFS(mp); 76612115Sdyson fs = ump->um_e2fs; 76712115Sdyson ronly = fs->s_rd_only; 76839670Sbde if (ronly == 0) { 76939670Sbde if (fs->s_wasvalid) 77039670Sbde fs->s_es->s_state |= EXT2_VALID_FS; 77112115Sdyson ext2_sbupdate(ump, MNT_WAIT); 77212115Sdyson } 77327881Sdyson 77412115Sdyson /* release buffers containing group descriptors */ 77512115Sdyson for(i = 0; i < fs->s_db_per_group; i++) 77627881Sdyson ULCK_BUF(fs->s_group_desc[i]) 77739671Sbde bsd_free(fs->s_group_desc, M_UFSMNT); 77827881Sdyson 77912115Sdyson /* release cached inode/block bitmaps */ 78012115Sdyson for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++) 78112115Sdyson if (fs->s_inode_bitmap[i]) 78227881Sdyson ULCK_BUF(fs->s_inode_bitmap[i]) 78327881Sdyson 78412115Sdyson for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++) 78512115Sdyson if (fs->s_block_bitmap[i]) 78627881Sdyson ULCK_BUF(fs->s_block_bitmap[i]) 78712115Sdyson 78834430Seivind ump->um_devvp->v_specmountpoint = NULL; 78912115Sdyson error = VOP_CLOSE(ump->um_devvp, ronly ? FREAD : FREAD|FWRITE, 79012115Sdyson NOCRED, p); 79112115Sdyson vrele(ump->um_devvp); 79212115Sdyson bsd_free(fs->s_es, M_UFSMNT); 79312115Sdyson bsd_free(fs, M_UFSMNT); 79412115Sdyson bsd_free(ump, M_UFSMNT); 79512115Sdyson mp->mnt_data = (qaddr_t)0; 79612115Sdyson mp->mnt_flag &= ~MNT_LOCAL; 79712115Sdyson return (error); 79812115Sdyson} 79912115Sdyson 80012115Sdyson/* 80112115Sdyson * Flush out all the files in a filesystem. 80212115Sdyson */ 80312911Sphkstatic int 80412115Sdysonext2_flushfiles(mp, flags, p) 80512115Sdyson register struct mount *mp; 80612115Sdyson int flags; 80712115Sdyson struct proc *p; 80812115Sdyson{ 80912115Sdyson register struct ufsmount *ump; 81012147Sdyson int error; 81112746Sbde#if QUOTA 81212746Sbde int i; 81312746Sbde#endif 81412115Sdyson 81512115Sdyson ump = VFSTOUFS(mp); 81612115Sdyson#if QUOTA 81712115Sdyson if (mp->mnt_flag & MNT_QUOTA) { 81843301Sdillon if ((error = vflush(mp, NULLVP, SKIPSYSTEM|flags)) != 0) 81912115Sdyson return (error); 82012115Sdyson for (i = 0; i < MAXQUOTAS; i++) { 82112115Sdyson if (ump->um_quotas[i] == NULLVP) 82212115Sdyson continue; 82312115Sdyson quotaoff(p, mp, i); 82412115Sdyson } 82512115Sdyson /* 82612115Sdyson * Here we fall through to vflush again to ensure 82712115Sdyson * that we have gotten rid of all the system vnodes. 82812115Sdyson */ 82912115Sdyson } 83012115Sdyson#endif 83112115Sdyson error = vflush(mp, NULLVP, flags); 83212115Sdyson return (error); 83312115Sdyson} 83412115Sdyson 83512115Sdyson/* 83612115Sdyson * Get file system statistics. 83712115Sdyson * taken from ext2/super.c ext2_statfs 83812115Sdyson */ 83912911Sphkstatic int 84012115Sdysonext2_statfs(mp, sbp, p) 84112115Sdyson struct mount *mp; 84212115Sdyson register struct statfs *sbp; 84312115Sdyson struct proc *p; 84412115Sdyson{ 84512115Sdyson unsigned long overhead; 84612115Sdyson unsigned long overhead_per_group; 84712115Sdyson 84812115Sdyson register struct ufsmount *ump; 84912115Sdyson register struct ext2_sb_info *fs; 85012115Sdyson register struct ext2_super_block *es; 85112115Sdyson 85212115Sdyson ump = VFSTOUFS(mp); 85312115Sdyson fs = ump->um_e2fs; 85412115Sdyson es = fs->s_es; 85512115Sdyson 85612115Sdyson if (es->s_magic != EXT2_SUPER_MAGIC) 85712115Sdyson panic("ext2_statfs - magic number spoiled"); 85812115Sdyson 85912115Sdyson /* 86012115Sdyson * Compute the overhead (FS structures) 86112115Sdyson */ 86212115Sdyson overhead_per_group = 1 /* super block */ + 86312115Sdyson fs->s_db_per_group + 86412115Sdyson 1 /* block bitmap */ + 86512115Sdyson 1 /* inode bitmap */ + 86612115Sdyson fs->s_itb_per_group; 86712115Sdyson overhead = es->s_first_data_block + 86812115Sdyson fs->s_groups_count * overhead_per_group; 86912115Sdyson 87012115Sdyson sbp->f_bsize = EXT2_FRAG_SIZE(fs); 87112115Sdyson sbp->f_iosize = EXT2_BLOCK_SIZE(fs); 87212115Sdyson sbp->f_blocks = es->s_blocks_count - overhead; 87312115Sdyson sbp->f_bfree = es->s_free_blocks_count; 87412115Sdyson sbp->f_bavail = sbp->f_bfree - es->s_r_blocks_count; 87512115Sdyson sbp->f_files = es->s_inodes_count; 87612115Sdyson sbp->f_ffree = es->s_free_inodes_count; 87712115Sdyson if (sbp != &mp->mnt_stat) { 87838909Sbde sbp->f_type = mp->mnt_vfc->vfc_typenum; 87912115Sdyson bcopy((caddr_t)mp->mnt_stat.f_mntonname, 88012115Sdyson (caddr_t)&sbp->f_mntonname[0], MNAMELEN); 88112115Sdyson bcopy((caddr_t)mp->mnt_stat.f_mntfromname, 88212115Sdyson (caddr_t)&sbp->f_mntfromname[0], MNAMELEN); 88312115Sdyson } 88412115Sdyson return (0); 88512115Sdyson} 88612115Sdyson 88712115Sdyson/* 88812115Sdyson * Go through the disk queues to initiate sandbagged IO; 88912115Sdyson * go through the inodes to write those that have been modified; 89012115Sdyson * initiate the writing of the super block if it has been modified. 89112115Sdyson * 89212115Sdyson * Note: we are always called with the filesystem marked `MPBUSY'. 89312115Sdyson */ 89412911Sphkstatic int 89512115Sdysonext2_sync(mp, waitfor, cred, p) 89612115Sdyson struct mount *mp; 89712115Sdyson int waitfor; 89812115Sdyson struct ucred *cred; 89912115Sdyson struct proc *p; 90012115Sdyson{ 90139678Sbde struct vnode *nvp, *vp; 90239678Sbde struct inode *ip; 90339678Sbde struct ufsmount *ump = VFSTOUFS(mp); 90439678Sbde struct ext2_sb_info *fs; 90512115Sdyson int error, allerror = 0; 90612115Sdyson 90712115Sdyson fs = ump->um_e2fs; 90839678Sbde if (fs->s_dirt != 0 && fs->s_rd_only != 0) { /* XXX */ 90939678Sbde printf("fs = %s\n", fs->fs_fsmnt); 91039678Sbde panic("ext2_sync: rofs mod"); 91112115Sdyson } 91212115Sdyson /* 91312115Sdyson * Write back each (modified) inode. 91412115Sdyson */ 91539678Sbde simple_lock(&mntvnode_slock); 91612115Sdysonloop: 91739678Sbde for (vp = mp->mnt_vnodelist.lh_first; vp != NULL; vp = nvp) { 91812115Sdyson /* 91912115Sdyson * If the vnode that we are about to sync is no longer 92012115Sdyson * associated with this mount point, start over. 92112115Sdyson */ 92212115Sdyson if (vp->v_mount != mp) 92312115Sdyson goto loop; 92439678Sbde simple_lock(&vp->v_interlock); 92539678Sbde nvp = vp->v_mntvnodes.le_next; 92612115Sdyson ip = VTOI(vp); 92739678Sbde if (vp->v_type == VNON || 92843309Sdillon ((ip->i_flag & 92912115Sdyson (IN_ACCESS | IN_CHANGE | IN_MODIFIED | IN_UPDATE)) == 0 && 93043395Sbde (TAILQ_EMPTY(&vp->v_dirtyblkhd) || waitfor == MNT_LAZY))) { 93139678Sbde simple_unlock(&vp->v_interlock); 93212115Sdyson continue; 93339678Sbde } 93439678Sbde simple_unlock(&mntvnode_slock); 93539678Sbde error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK, p); 93639678Sbde if (error) { 93739678Sbde simple_lock(&mntvnode_slock); 93839678Sbde if (error == ENOENT) 93939678Sbde goto loop; 94039678Sbde continue; 94139678Sbde } 94243301Sdillon if ((error = VOP_FSYNC(vp, cred, waitfor, p)) != 0) 94312115Sdyson allerror = error; 94439678Sbde VOP_UNLOCK(vp, 0, p); 94539678Sbde vrele(vp); 94639678Sbde simple_lock(&mntvnode_slock); 94712115Sdyson } 94839678Sbde simple_unlock(&mntvnode_slock); 94912115Sdyson /* 95012115Sdyson * Force stale file system control information to be flushed. 95112115Sdyson */ 95239678Sbde if (waitfor != MNT_LAZY) { 95339678Sbde vn_lock(ump->um_devvp, LK_EXCLUSIVE | LK_RETRY, p); 95439678Sbde if ((error = VOP_FSYNC(ump->um_devvp, cred, waitfor, p)) != 0) 95539678Sbde allerror = error; 95639678Sbde VOP_UNLOCK(ump->um_devvp, 0, p); 95739678Sbde } 95812115Sdyson#if QUOTA 95912115Sdyson qsync(mp); 96012115Sdyson#endif 96139678Sbde /* 96239678Sbde * Write back modified superblock. 96339678Sbde */ 96439678Sbde if (fs->s_dirt != 0) { 96539678Sbde fs->s_dirt = 0; 96639678Sbde fs->s_es->s_wtime = time_second; 96739678Sbde if ((error = ext2_sbupdate(ump, waitfor)) != 0) 96839678Sbde allerror = error; 96939678Sbde } 97012115Sdyson return (allerror); 97112115Sdyson} 97212115Sdyson 97312115Sdyson/* 97412115Sdyson * Look up a EXT2FS dinode number to find its incore vnode, otherwise read it 97512115Sdyson * in from disk. If it is in core, wait for the lock bit to clear, then 97612115Sdyson * return the inode locked. Detection and handling of mount points must be 97712115Sdyson * done by the calling routine. 97812115Sdyson */ 97912911Sphkstatic int 98012115Sdysonext2_vget(mp, ino, vpp) 98112115Sdyson struct mount *mp; 98212115Sdyson ino_t ino; 98312115Sdyson struct vnode **vpp; 98412115Sdyson{ 98512115Sdyson register struct ext2_sb_info *fs; 98612115Sdyson register struct inode *ip; 98712115Sdyson struct ufsmount *ump; 98812115Sdyson struct buf *bp; 98912115Sdyson struct vnode *vp; 99012115Sdyson dev_t dev; 99130280Sphk int i, error; 99212115Sdyson int used_blocks; 99312115Sdyson 99412115Sdyson ump = VFSTOUFS(mp); 99512115Sdyson dev = ump->um_dev; 99612406Sdysonrestart: 99712115Sdyson if ((*vpp = ufs_ihashget(dev, ino)) != NULL) 99812115Sdyson return (0); 99912115Sdyson 100012406Sdyson /* 100112406Sdyson * Lock out the creation of new entries in the FFS hash table in 100212406Sdyson * case getnewvnode() or MALLOC() blocks, otherwise a duplicate 100312406Sdyson * may occur! 100412406Sdyson */ 100512406Sdyson if (ext2fs_inode_hash_lock) { 100612406Sdyson while (ext2fs_inode_hash_lock) { 100712406Sdyson ext2fs_inode_hash_lock = -1; 100836102Sbde tsleep(&ext2fs_inode_hash_lock, PVM, "e2vget", 0); 100912406Sdyson } 101012406Sdyson goto restart; 101112406Sdyson } 101212406Sdyson ext2fs_inode_hash_lock = 1; 101312406Sdyson 101436102Sbde /* 101536102Sbde * If this MALLOC() is performed after the getnewvnode() 101636102Sbde * it might block, leaving a vnode with a NULL v_data to be 101736102Sbde * found by ext2_sync() if a sync happens to fire right then, 101836102Sbde * which will cause a panic because ext2_sync() blindly 101936102Sbde * dereferences vp->v_data (as well it should). 102036102Sbde */ 102136102Sbde MALLOC(ip, struct inode *, sizeof(struct inode), M_EXT2NODE, M_WAITOK); 102236102Sbde 102312115Sdyson /* Allocate a new vnode/inode. */ 102443301Sdillon if ((error = getnewvnode(VT_UFS, mp, ext2_vnodeop_p, &vp)) != 0) { 102536102Sbde if (ext2fs_inode_hash_lock < 0) 102636102Sbde wakeup(&ext2fs_inode_hash_lock); 102736102Sbde ext2fs_inode_hash_lock = 0; 102812115Sdyson *vpp = NULL; 102936102Sbde FREE(ip, M_EXT2NODE); 103012115Sdyson return (error); 103112115Sdyson } 103212115Sdyson bzero((caddr_t)ip, sizeof(struct inode)); 103338998Sbde lockinit(&ip->i_lock, PINOD, "ext2in", 0, 0); 103412115Sdyson vp->v_data = ip; 103512115Sdyson ip->i_vnode = vp; 103612115Sdyson ip->i_e2fs = fs = ump->um_e2fs; 103712115Sdyson ip->i_dev = dev; 103812115Sdyson ip->i_number = ino; 103912115Sdyson#if QUOTA 104012115Sdyson for (i = 0; i < MAXQUOTAS; i++) 104112115Sdyson ip->i_dquot[i] = NODQUOT; 104212115Sdyson#endif 104312115Sdyson /* 104412115Sdyson * Put it onto its hash chain and lock it so that other requests for 104512115Sdyson * this inode will block if they arrive while we are sleeping waiting 104612115Sdyson * for old data structures to be purged or for the contents of the 104712115Sdyson * disk portion of this inode to be read. 104812115Sdyson */ 104912115Sdyson ufs_ihashins(ip); 105012115Sdyson 105112406Sdyson if (ext2fs_inode_hash_lock < 0) 105212406Sdyson wakeup(&ext2fs_inode_hash_lock); 105312406Sdyson ext2fs_inode_hash_lock = 0; 105412406Sdyson 105512115Sdyson /* Read in the disk contents for the inode, copy into the inode. */ 105612115Sdyson#if 0 105712115Sdysonprintf("ext2_vget(%d) dbn= %d ", ino, fsbtodb(fs, ino_to_fsba(fs, ino))); 105812115Sdyson#endif 105943301Sdillon if ((error = bread(ump->um_devvp, fsbtodb(fs, ino_to_fsba(fs, ino)), 106043301Sdillon (int)fs->s_blocksize, NOCRED, &bp)) != 0) { 106112115Sdyson /* 106212115Sdyson * The inode does not contain anything useful, so it would 106312115Sdyson * be misleading to leave it on its hash chain. With mode 106412115Sdyson * still zero, it will be unlinked and returned to the free 106512115Sdyson * list by vput(). 106612115Sdyson */ 106712115Sdyson vput(vp); 106812115Sdyson brelse(bp); 106912115Sdyson *vpp = NULL; 107012115Sdyson return (error); 107112115Sdyson } 107212115Sdyson /* convert ext2 inode to dinode */ 107312115Sdyson ext2_ei2di((struct ext2_inode *) ((char *)bp->b_data + EXT2_INODE_SIZE * 107412115Sdyson ino_to_fsbo(fs, ino)), &ip->i_din); 107512115Sdyson ip->i_block_group = ino_to_cg(fs, ino); 107612115Sdyson ip->i_next_alloc_block = 0; 107712115Sdyson ip->i_next_alloc_goal = 0; 107812115Sdyson ip->i_prealloc_count = 0; 107912115Sdyson ip->i_prealloc_block = 0; 108012115Sdyson /* now we want to make sure that block pointers for unused 108112115Sdyson blocks are zeroed out - ext2_balloc depends on this 108212115Sdyson although for regular files and directories only 108312115Sdyson */ 108412115Sdyson if(S_ISDIR(ip->i_mode) || S_ISREG(ip->i_mode)) { 108512115Sdyson used_blocks = (ip->i_size+fs->s_blocksize-1) / fs->s_blocksize; 108612115Sdyson for(i = used_blocks; i < EXT2_NDIR_BLOCKS; i++) 108712115Sdyson ip->i_db[i] = 0; 108812115Sdyson } 108912115Sdyson/* 109012115Sdyson ext2_print_inode(ip); 109112115Sdyson*/ 109212115Sdyson brelse(bp); 109312115Sdyson 109412115Sdyson /* 109512115Sdyson * Initialize the vnode from the inode, check for aliases. 109612115Sdyson * Note that the underlying vnode may have changed. 109712115Sdyson */ 109843301Sdillon if ((error = ufs_vinit(mp, ext2_specop_p, ext2_fifoop_p, &vp)) != 0) { 109912115Sdyson vput(vp); 110012115Sdyson *vpp = NULL; 110112115Sdyson return (error); 110212115Sdyson } 110312115Sdyson /* 110412115Sdyson * Finish inode initialization now that aliasing has been resolved. 110512115Sdyson */ 110612115Sdyson ip->i_devvp = ump->um_devvp; 110712115Sdyson VREF(ip->i_devvp); 110812115Sdyson /* 110912115Sdyson * Set up a generation number for this inode if it does not 111012115Sdyson * already have one. This should only happen on old filesystems. 111112115Sdyson */ 111212115Sdyson if (ip->i_gen == 0) { 111331485Sbde ip->i_gen = random() / 2 + 1; 111412115Sdyson if ((vp->v_mount->mnt_flag & MNT_RDONLY) == 0) 111512115Sdyson ip->i_flag |= IN_MODIFIED; 111612115Sdyson } 111712115Sdyson *vpp = vp; 111812115Sdyson return (0); 111912115Sdyson} 112012115Sdyson 112112115Sdyson/* 112212115Sdyson * File handle to vnode 112312115Sdyson * 112412115Sdyson * Have to be really careful about stale file handles: 112512115Sdyson * - check that the inode number is valid 112612115Sdyson * - call ext2_vget() to get the locked inode 112712115Sdyson * - check for an unallocated inode (i_mode == 0) 112812115Sdyson * - check that the given client host has export rights and return 112912115Sdyson * those rights via. exflagsp and credanonp 113012115Sdyson */ 113112911Sphkstatic int 113251138Salfredext2_fhtovp(mp, fhp, vpp) 113312115Sdyson register struct mount *mp; 113412115Sdyson struct fid *fhp; 113512115Sdyson struct vnode **vpp; 113612115Sdyson{ 113712115Sdyson register struct ufid *ufhp; 113812115Sdyson struct ext2_sb_info *fs; 113912115Sdyson 114012115Sdyson ufhp = (struct ufid *)fhp; 114112115Sdyson fs = VFSTOUFS(mp)->um_e2fs; 114212115Sdyson if (ufhp->ufid_ino < ROOTINO || 114312115Sdyson ufhp->ufid_ino >= fs->s_groups_count * fs->s_es->s_inodes_per_group) 114412115Sdyson return (ESTALE); 114551138Salfred return (ufs_fhtovp(mp, ufhp, vpp)); 114612115Sdyson} 114712115Sdyson 114812115Sdyson/* 114912115Sdyson * Vnode pointer to File handle 115012115Sdyson */ 115112115Sdyson/* ARGSUSED */ 115212911Sphkstatic int 115312115Sdysonext2_vptofh(vp, fhp) 115412115Sdyson struct vnode *vp; 115512115Sdyson struct fid *fhp; 115612115Sdyson{ 115712115Sdyson register struct inode *ip; 115812115Sdyson register struct ufid *ufhp; 115912115Sdyson 116012115Sdyson ip = VTOI(vp); 116112115Sdyson ufhp = (struct ufid *)fhp; 116212115Sdyson ufhp->ufid_len = sizeof(struct ufid); 116312115Sdyson ufhp->ufid_ino = ip->i_number; 116412115Sdyson ufhp->ufid_gen = ip->i_gen; 116512115Sdyson return (0); 116612115Sdyson} 116712115Sdyson 116812115Sdyson/* 116912115Sdyson * Write a superblock and associated information back to disk. 117012115Sdyson */ 117112911Sphkstatic int 117212115Sdysonext2_sbupdate(mp, waitfor) 117312115Sdyson struct ufsmount *mp; 117412115Sdyson int waitfor; 117512115Sdyson{ 117612115Sdyson register struct ext2_sb_info *fs = mp->um_e2fs; 117712115Sdyson register struct ext2_super_block *es = fs->s_es; 117812115Sdyson register struct buf *bp; 117941591Sarchie int error = 0; 118012115Sdyson/* 118112115Sdysonprintf("\nupdating superblock, waitfor=%s\n", waitfor == MNT_WAIT ? "yes":"no"); 118212115Sdyson*/ 118312115Sdyson bp = getblk(mp->um_devvp, SBLOCK, SBSIZE, 0, 0); 118412115Sdyson bcopy((caddr_t)es, bp->b_data, (u_int)sizeof(struct ext2_super_block)); 118512115Sdyson if (waitfor == MNT_WAIT) 118612115Sdyson error = bwrite(bp); 118712115Sdyson else 118812115Sdyson bawrite(bp); 118912115Sdyson 119027881Sdyson /* 119127881Sdyson * The buffers for group descriptors, inode bitmaps and block bitmaps 119227881Sdyson * are not busy at this point and are (hopefully) written by the 119327881Sdyson * usual sync mechanism. No need to write them here 119412115Sdyson */ 119512115Sdyson 119612115Sdyson return (error); 119712115Sdyson} 1198