ext2_vfsops.c revision 36102
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 4012115Sdyson */ 4112115Sdyson 4213260Swollman#include "opt_quota.h" 4312115Sdyson 4412115Sdyson#include <sys/param.h> 4512115Sdyson#include <sys/systm.h> 4612115Sdyson#include <sys/namei.h> 4712115Sdyson#include <sys/proc.h> 4812115Sdyson#include <sys/kernel.h> 4912115Sdyson#include <sys/vnode.h> 5012115Sdyson#include <sys/mount.h> 5112115Sdyson#include <sys/buf.h> 5229906Skato#include <sys/conf.h> 5324131Sbde#include <sys/fcntl.h> 5412115Sdyson#include <sys/disklabel.h> 5512115Sdyson#include <sys/malloc.h> 5612115Sdyson#include <sys/stat.h> 5712115Sdyson 5812115Sdyson#include <miscfs/specfs/specdev.h> 5912115Sdyson 6012115Sdyson#include <ufs/ufs/quota.h> 6112115Sdyson#include <ufs/ufs/ufsmount.h> 6212115Sdyson#include <ufs/ufs/inode.h> 6312115Sdyson#include <ufs/ufs/ufs_extern.h> 6412115Sdyson 6512115Sdyson#include <gnu/ext2fs/fs.h> 6612115Sdyson#include <gnu/ext2fs/ext2_extern.h> 6712115Sdyson#include <gnu/ext2fs/ext2_fs.h> 6812115Sdyson#include <gnu/ext2fs/ext2_fs_sb.h> 6912115Sdyson 7028270Swollmanstatic int ext2_fhtovp __P((struct mount *, struct fid *, struct sockaddr *, 7112911Sphk struct vnode **, int *, struct ucred **)); 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, 9712115Sdyson ext2_vptofh, 9812115Sdyson ext2_init, 9912115Sdyson}; 10012115Sdyson 10112115SdysonVFS_SET(ext2fs_vfsops, ext2fs, MOUNT_EXT2FS, 0); 10212115Sdyson#define bsd_malloc malloc 10312115Sdyson#define bsd_free free 10412115Sdyson 10512911Sphkstatic int ext2fs_inode_hash_lock; 10612115Sdyson 10716322Sgpalmerstatic int compute_sb_data __P((struct vnode * devvp, 10816322Sgpalmer struct ext2_super_block * es, 10916322Sgpalmer struct ext2_sb_info * fs)); 11016322Sgpalmer 11116322Sgpalmer#ifdef notyet 11216322Sgpalmerstatic int ext2_mountroot __P((void)); 11316322Sgpalmer 11412115Sdyson/* 11516322Sgpalmer * Called by main() when ext2fs is going to be mounted as root. 11612115Sdyson * 11712115Sdyson * Name is updated by mount(8) after booting. 11812115Sdyson */ 11912115Sdyson#define ROOTNAME "root_device" 12012115Sdyson 12112911Sphkstatic int 12212115Sdysonext2_mountroot() 12312115Sdyson{ 12412115Sdyson register struct ext2_sb_info *fs; 12512115Sdyson register struct mount *mp; 12612115Sdyson struct proc *p = curproc; 12712115Sdyson struct ufsmount *ump; 12812115Sdyson u_int size; 12912115Sdyson int error; 13012115Sdyson 13129208Sbde if ((error = bdevvp(rootdev, &rootvp))) { 13229208Sbde printf("ext2_mountroot: can't find rootvp"); 13329208Sbde return (error); 13429208Sbde } 13512115Sdyson mp = bsd_malloc((u_long)sizeof(struct mount), M_MOUNT, M_WAITOK); 13612115Sdyson bzero((char *)mp, (u_long)sizeof(struct mount)); 13712115Sdyson mp->mnt_op = &ext2fs_vfsops; 13812115Sdyson mp->mnt_flag = MNT_RDONLY; 13929888Skato if (bdevsw[major(rootdev)]->d_flags & D_NOCLUSTERR) 14029888Skato mp->mnt_flag |= MNT_NOCLUSTERR; 14129888Skato if (bdevsw[major(rootdev)]->d_flags & D_NOCLUSTERW) 14229888Skato mp->mnt_flag |= MNT_NOCLUSTERW; 14312115Sdyson if (error = ext2_mountfs(rootvp, mp, p)) { 14412115Sdyson bsd_free(mp, M_MOUNT); 14512115Sdyson return (error); 14612115Sdyson } 14712115Sdyson if (error = vfs_lock(mp)) { 14812115Sdyson (void)ext2_unmount(mp, 0, p); 14912115Sdyson bsd_free(mp, M_MOUNT); 15012115Sdyson return (error); 15112115Sdyson } 15230469Sjulian CIRCLEQ_INSERT_HEAD(&mountlist, mp, mnt_list); 15312115Sdyson mp->mnt_flag |= MNT_ROOTFS; 15412115Sdyson mp->mnt_vnodecovered = NULLVP; 15512115Sdyson ump = VFSTOUFS(mp); 15612115Sdyson fs = ump->um_e2fs; 15712115Sdyson bzero(fs->fs_fsmnt, sizeof(fs->fs_fsmnt)); 15812115Sdyson fs->fs_fsmnt[0] = '/'; 15912115Sdyson bcopy((caddr_t)fs->fs_fsmnt, (caddr_t)mp->mnt_stat.f_mntonname, 16012115Sdyson MNAMELEN); 16112115Sdyson (void) copystr(ROOTNAME, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 16212115Sdyson &size); 16312115Sdyson bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 16412115Sdyson (void)ext2_statfs(mp, &mp->mnt_stat, p); 16512115Sdyson vfs_unlock(mp); 16612115Sdyson inittodr(fs->s_es->s_wtime); /* this helps to set the time */ 16712115Sdyson return (0); 16812115Sdyson} 16916322Sgpalmer#endif 17012115Sdyson 17112115Sdyson/* 17212115Sdyson * VFS Operations. 17312115Sdyson * 17412115Sdyson * mount system call 17512115Sdyson */ 17612911Sphkstatic int 17712115Sdysonext2_mount(mp, path, data, ndp, p) 17812115Sdyson register struct mount *mp; 17912115Sdyson char *path; 18012115Sdyson caddr_t data; /* this is actually a (struct ufs_args *) */ 18112115Sdyson struct nameidata *ndp; 18212115Sdyson struct proc *p; 18312115Sdyson{ 18412115Sdyson struct vnode *devvp; 18512115Sdyson struct ufs_args args; 18612115Sdyson struct ufsmount *ump = 0; 18712115Sdyson register struct ext2_sb_info *fs; 18812115Sdyson u_int size; 18912115Sdyson int error, flags; 19012115Sdyson 19112115Sdyson if (error = copyin(data, (caddr_t)&args, sizeof (struct ufs_args))) 19212115Sdyson return (error); 19312115Sdyson /* 19412115Sdyson * If updating, check whether changing from read-only to 19512115Sdyson * read/write; if there is no device name, that's all we do. 19629888Skato * Disallow clearing MNT_NOCLUSTERR and MNT_NOCLUSTERW flags, 19729888Skato * if block device requests. 19812115Sdyson */ 19912115Sdyson if (mp->mnt_flag & MNT_UPDATE) { 20012115Sdyson ump = VFSTOUFS(mp); 20112115Sdyson fs = ump->um_e2fs; 20212115Sdyson error = 0; 20329888Skato if (bdevsw[major(ump->um_dev)]->d_flags & D_NOCLUSTERR) 20429888Skato mp->mnt_flag |= MNT_NOCLUSTERR; 20529888Skato if (bdevsw[major(ump->um_dev)]->d_flags & D_NOCLUSTERW) 20629888Skato mp->mnt_flag |= MNT_NOCLUSTERW; 20712115Sdyson if (fs->s_rd_only == 0 && (mp->mnt_flag & MNT_RDONLY)) { 20812115Sdyson flags = WRITECLOSE; 20912115Sdyson if (mp->mnt_flag & MNT_FORCE) 21012115Sdyson flags |= FORCECLOSE; 21122521Sdyson if (vfs_busy(mp, LK_NOWAIT, 0, p)) 21212115Sdyson return (EBUSY); 21312115Sdyson error = ext2_flushfiles(mp, flags, p); 21422521Sdyson vfs_unbusy(mp, p); 21512115Sdyson } 21612115Sdyson if (!error && (mp->mnt_flag & MNT_RELOAD)) 21712115Sdyson error = ext2_reload(mp, ndp->ni_cnd.cn_cred, p); 21812115Sdyson if (error) 21912115Sdyson return (error); 22031132Sjulian if (fs->s_rd_only && (mp->mnt_kern_flag & MNTK_WANTRDWR)) 22112115Sdyson fs->s_rd_only = 0; 22212115Sdyson if (fs->s_rd_only == 0) { 22312115Sdyson /* don't say it's clean */ 22412115Sdyson fs->s_es->s_state &= ~EXT2_VALID_FS; 22512115Sdyson ext2_sbupdate(ump, MNT_WAIT); 22612115Sdyson } 22712115Sdyson if (args.fspec == 0) { 22812115Sdyson /* 22912115Sdyson * Process export requests. 23012115Sdyson */ 23112115Sdyson return (vfs_export(mp, &ump->um_export, &args.export)); 23212115Sdyson } 23312115Sdyson } 23412115Sdyson /* 23512115Sdyson * Not an update, or updating the name: look up the name 23612115Sdyson * and verify that it refers to a sensible block device. 23712115Sdyson */ 23812115Sdyson NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, args.fspec, p); 23912115Sdyson if (error = namei(ndp)) 24012115Sdyson return (error); 24112115Sdyson devvp = ndp->ni_vp; 24212115Sdyson 24312115Sdyson if (devvp->v_type != VBLK) { 24412115Sdyson vrele(devvp); 24512115Sdyson return (ENOTBLK); 24612115Sdyson } 24712115Sdyson if (major(devvp->v_rdev) >= nblkdev) { 24812115Sdyson vrele(devvp); 24912115Sdyson return (ENXIO); 25012115Sdyson } 25129888Skato if ((mp->mnt_flag & MNT_UPDATE) == 0) { 25229888Skato if (bdevsw[major(devvp->v_rdev)]->d_flags & D_NOCLUSTERR) 25329888Skato mp->mnt_flag |= MNT_NOCLUSTERR; 25429888Skato if (bdevsw[major(devvp->v_rdev)]->d_flags & D_NOCLUSTERW) 25529888Skato mp->mnt_flag |= MNT_NOCLUSTERW; 25612115Sdyson error = ext2_mountfs(devvp, mp, p); 25729888Skato } else { 25812115Sdyson if (devvp != ump->um_devvp) 25912115Sdyson error = EINVAL; /* needs translation */ 26012115Sdyson else 26112115Sdyson vrele(devvp); 26212115Sdyson } 26312115Sdyson if (error) { 26412115Sdyson vrele(devvp); 26512115Sdyson return (error); 26612115Sdyson } 26712115Sdyson ump = VFSTOUFS(mp); 26812115Sdyson fs = ump->um_e2fs; 26912115Sdyson (void) copyinstr(path, fs->fs_fsmnt, sizeof(fs->fs_fsmnt) - 1, &size); 27012115Sdyson bzero(fs->fs_fsmnt + size, sizeof(fs->fs_fsmnt) - size); 27112115Sdyson bcopy((caddr_t)fs->fs_fsmnt, (caddr_t)mp->mnt_stat.f_mntonname, 27212115Sdyson MNAMELEN); 27312115Sdyson (void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 27412115Sdyson &size); 27512115Sdyson bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 27612115Sdyson (void)ext2_statfs(mp, &mp->mnt_stat, p); 27712115Sdyson return (0); 27812115Sdyson} 27912115Sdyson 28012115Sdyson/* 28112115Sdyson * checks that the data in the descriptor blocks make sense 28212115Sdyson * this is taken from ext2/super.c 28312115Sdyson */ 28412115Sdysonstatic int ext2_check_descriptors (struct ext2_sb_info * sb) 28512115Sdyson{ 28612115Sdyson int i; 28712115Sdyson int desc_block = 0; 28812115Sdyson unsigned long block = sb->s_es->s_first_data_block; 28912115Sdyson struct ext2_group_desc * gdp = NULL; 29012115Sdyson 29112115Sdyson /* ext2_debug ("Checking group descriptors"); */ 29212115Sdyson 29312115Sdyson for (i = 0; i < sb->s_groups_count; i++) 29412115Sdyson { 29512115Sdyson /* examine next descriptor block */ 29612115Sdyson if ((i % EXT2_DESC_PER_BLOCK(sb)) == 0) 29712115Sdyson gdp = (struct ext2_group_desc *) 29812115Sdyson sb->s_group_desc[desc_block++]->b_data; 29912115Sdyson if (gdp->bg_block_bitmap < block || 30012115Sdyson gdp->bg_block_bitmap >= block + EXT2_BLOCKS_PER_GROUP(sb)) 30112115Sdyson { 30212115Sdyson printf ("ext2_check_descriptors: " 30312115Sdyson "Block bitmap for group %d" 30412115Sdyson " not in group (block %lu)!", 30512115Sdyson i, (unsigned long) gdp->bg_block_bitmap); 30612115Sdyson return 0; 30712115Sdyson } 30812115Sdyson if (gdp->bg_inode_bitmap < block || 30912115Sdyson gdp->bg_inode_bitmap >= block + EXT2_BLOCKS_PER_GROUP(sb)) 31012115Sdyson { 31112115Sdyson printf ("ext2_check_descriptors: " 31212115Sdyson "Inode bitmap for group %d" 31312115Sdyson " not in group (block %lu)!", 31412115Sdyson i, (unsigned long) gdp->bg_inode_bitmap); 31512115Sdyson return 0; 31612115Sdyson } 31712115Sdyson if (gdp->bg_inode_table < block || 31812115Sdyson gdp->bg_inode_table + sb->s_itb_per_group >= 31912115Sdyson block + EXT2_BLOCKS_PER_GROUP(sb)) 32012115Sdyson { 32112115Sdyson printf ("ext2_check_descriptors: " 32212115Sdyson "Inode table for group %d" 32312115Sdyson " not in group (block %lu)!", 32412115Sdyson i, (unsigned long) gdp->bg_inode_table); 32512115Sdyson return 0; 32612115Sdyson } 32712115Sdyson block += EXT2_BLOCKS_PER_GROUP(sb); 32812115Sdyson gdp++; 32912115Sdyson } 33012115Sdyson return 1; 33112115Sdyson} 33212115Sdyson 33312115Sdyson/* 33412115Sdyson * this computes the fields of the ext2_sb_info structure from the 33512115Sdyson * data in the ext2_super_block structure read in 33612115Sdyson */ 33712115Sdysonstatic int compute_sb_data(devvp, es, fs) 33812115Sdyson struct vnode * devvp; 33912115Sdyson struct ext2_super_block * es; 34012115Sdyson struct ext2_sb_info * fs; 34112115Sdyson{ 34212115Sdyson int db_count, error; 34312115Sdyson int i, j; 34412115Sdyson int logic_sb_block = 1; /* XXX for now */ 34512115Sdyson 34612115Sdyson#if 1 34712115Sdyson#define V(v) 34812115Sdyson#else 34912115Sdyson#define V(v) printf(#v"= %d\n", fs->v); 35012115Sdyson#endif 35112115Sdyson 35212115Sdyson fs->s_blocksize = EXT2_MIN_BLOCK_SIZE << es->s_log_block_size; 35312115Sdyson V(s_blocksize) 35412115Sdyson fs->s_bshift = EXT2_MIN_BLOCK_LOG_SIZE + es->s_log_block_size; 35512115Sdyson V(s_bshift) 35612115Sdyson fs->s_fsbtodb = es->s_log_block_size + 1; 35712115Sdyson V(s_fsbtodb) 35812115Sdyson fs->s_qbmask = fs->s_blocksize - 1; 35912115Sdyson V(s_bmask) 36012115Sdyson fs->s_blocksize_bits = EXT2_BLOCK_SIZE_BITS(es); 36112115Sdyson V(s_blocksize_bits) 36212115Sdyson fs->s_frag_size = EXT2_MIN_FRAG_SIZE << es->s_log_frag_size; 36312115Sdyson V(s_frag_size) 36412115Sdyson if (fs->s_frag_size) 36512115Sdyson fs->s_frags_per_block = fs->s_blocksize / fs->s_frag_size; 36612115Sdyson V(s_frags_per_block) 36712115Sdyson fs->s_blocks_per_group = es->s_blocks_per_group; 36812115Sdyson V(s_blocks_per_group) 36912115Sdyson fs->s_frags_per_group = es->s_frags_per_group; 37012115Sdyson V(s_frags_per_group) 37112115Sdyson fs->s_inodes_per_group = es->s_inodes_per_group; 37212115Sdyson V(s_inodes_per_group) 37312115Sdyson fs->s_inodes_per_block = fs->s_blocksize / EXT2_INODE_SIZE; 37412115Sdyson V(s_inodes_per_block) 37512115Sdyson fs->s_itb_per_group = fs->s_inodes_per_group /fs->s_inodes_per_block; 37612115Sdyson V(s_itb_per_group) 37712115Sdyson fs->s_desc_per_block = fs->s_blocksize / sizeof (struct ext2_group_desc); 37812115Sdyson V(s_desc_per_block) 37912115Sdyson /* s_resuid / s_resgid ? */ 38012115Sdyson fs->s_groups_count = (es->s_blocks_count - 38112115Sdyson es->s_first_data_block + 38212115Sdyson EXT2_BLOCKS_PER_GROUP(fs) - 1) / 38312115Sdyson EXT2_BLOCKS_PER_GROUP(fs); 38412115Sdyson V(s_groups_count) 38512115Sdyson db_count = (fs->s_groups_count + EXT2_DESC_PER_BLOCK(fs) - 1) / 38612115Sdyson EXT2_DESC_PER_BLOCK(fs); 38712115Sdyson fs->s_db_per_group = db_count; 38812115Sdyson V(s_db_per_group) 38912115Sdyson 39012115Sdyson fs->s_group_desc = bsd_malloc(db_count * sizeof (struct buf *), 39112115Sdyson M_UFSMNT, M_WAITOK); 39212115Sdyson 39312115Sdyson /* adjust logic_sb_block */ 39412115Sdyson if(fs->s_blocksize > SBSIZE) 39512115Sdyson /* Godmar thinks: if the blocksize is greater than 1024, then 39612115Sdyson the superblock is logically part of block zero. 39712115Sdyson */ 39812115Sdyson logic_sb_block = 0; 39912115Sdyson 40012115Sdyson for (i = 0; i < db_count; i++) { 40112115Sdyson error = bread(devvp , fsbtodb(fs, logic_sb_block + i + 1), 40212115Sdyson fs->s_blocksize, NOCRED, &fs->s_group_desc[i]); 40312115Sdyson if(error) { 40412115Sdyson for (j = 0; j < i; j++) 40512115Sdyson brelse(fs->s_group_desc[j]); 40612115Sdyson bsd_free(fs->s_group_desc, M_UFSMNT); 40712115Sdyson printf("EXT2-fs: unable to read group descriptors (%d)\n", error); 40812115Sdyson return EIO; 40912115Sdyson } 41027881Sdyson /* Set the B_LOCKED flag on the buffer, then brelse() it */ 41127881Sdyson LCK_BUF(fs->s_group_desc[i]) 41212115Sdyson } 41312115Sdyson if(!ext2_check_descriptors(fs)) { 41412115Sdyson for (j = 0; j < db_count; j++) 41527881Sdyson ULCK_BUF(fs->s_group_desc[j]) 41612115Sdyson bsd_free(fs->s_group_desc, M_UFSMNT); 41712115Sdyson printf("EXT2-fs: (ext2_check_descriptors failure) " 41812115Sdyson "unable to read group descriptors\n"); 41912115Sdyson return EIO; 42012115Sdyson } 42112115Sdyson 42212115Sdyson for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++) { 42312115Sdyson fs->s_inode_bitmap_number[i] = 0; 42412115Sdyson fs->s_inode_bitmap[i] = NULL; 42512115Sdyson fs->s_block_bitmap_number[i] = 0; 42612115Sdyson fs->s_block_bitmap[i] = NULL; 42712115Sdyson } 42812115Sdyson fs->s_loaded_inode_bitmaps = 0; 42912115Sdyson fs->s_loaded_block_bitmaps = 0; 43012115Sdyson return 0; 43112115Sdyson} 43212115Sdyson 43312115Sdyson/* 43412115Sdyson * Reload all incore data for a filesystem (used after running fsck on 43512115Sdyson * the root filesystem and finding things to fix). The filesystem must 43612115Sdyson * be mounted read-only. 43712115Sdyson * 43812115Sdyson * Things to do to update the mount: 43912115Sdyson * 1) invalidate all cached meta-data. 44012115Sdyson * 2) re-read superblock from disk. 44112115Sdyson * 3) re-read summary information from disk. 44212115Sdyson * 4) invalidate all inactive vnodes. 44312115Sdyson * 5) invalidate all cached file data. 44412115Sdyson * 6) re-read inode data for all active vnodes. 44512115Sdyson */ 44612911Sphkstatic int 44712115Sdysonext2_reload(mountp, cred, p) 44812115Sdyson register struct mount *mountp; 44912115Sdyson struct ucred *cred; 45012115Sdyson struct proc *p; 45112115Sdyson{ 45212115Sdyson register struct vnode *vp, *nvp, *devvp; 45312115Sdyson struct inode *ip; 45412115Sdyson struct buf *bp; 45512115Sdyson struct ext2_super_block * es; 45612115Sdyson struct ext2_sb_info *fs; 45712147Sdyson int error; 45812115Sdyson 45912115Sdyson if ((mountp->mnt_flag & MNT_RDONLY) == 0) 46012115Sdyson return (EINVAL); 46112115Sdyson /* 46212115Sdyson * Step 1: invalidate all cached meta-data. 46312115Sdyson */ 46412115Sdyson devvp = VFSTOUFS(mountp)->um_devvp; 46512115Sdyson if (vinvalbuf(devvp, 0, cred, p, 0, 0)) 46612115Sdyson panic("ext2_reload: dirty1"); 46712115Sdyson /* 46812115Sdyson * Step 2: re-read superblock from disk. 46912115Sdyson * constants have been adjusted for ext2 47012115Sdyson */ 47112115Sdyson if (error = bread(devvp, SBLOCK, SBSIZE, NOCRED, &bp)) 47212115Sdyson return (error); 47312115Sdyson es = (struct ext2_super_block *)bp->b_data; 47412115Sdyson if (es->s_magic != EXT2_SUPER_MAGIC) { 47512115Sdyson if(es->s_magic == EXT2_PRE_02B_MAGIC) 47612115Sdyson printf("This filesystem bears the magic number of a pre " 47712115Sdyson "0.2b version of ext2. This is not supported by " 47812115Sdyson "Lites.\n"); 47912115Sdyson else 48012115Sdyson printf("Wrong magic number: %x (expected %x for ext2 fs\n", 48112115Sdyson es->s_magic, EXT2_SUPER_MAGIC); 48212115Sdyson brelse(bp); 48312115Sdyson return (EIO); /* XXX needs translation */ 48412115Sdyson } 48512115Sdyson fs = VFSTOUFS(mountp)->um_e2fs; 48612115Sdyson bcopy(bp->b_data, fs->s_es, sizeof(struct ext2_super_block)); 48712115Sdyson 48812115Sdyson if(error = compute_sb_data(devvp, es, fs)) { 48912115Sdyson brelse(bp); 49012115Sdyson return error; 49112115Sdyson } 49212115Sdyson#ifdef UNKLAR 49312115Sdyson if (fs->fs_sbsize < SBSIZE) 49412115Sdyson bp->b_flags |= B_INVAL; 49512115Sdyson#endif 49612115Sdyson brelse(bp); 49712115Sdyson 49812115Sdysonloop: 49912115Sdyson for (vp = mountp->mnt_vnodelist.lh_first; vp != NULL; vp = nvp) { 50012115Sdyson nvp = vp->v_mntvnodes.le_next; 50112115Sdyson /* 50212115Sdyson * Step 4: invalidate all inactive vnodes. 50312115Sdyson */ 50412115Sdyson if (vp->v_usecount == 0) { 50512115Sdyson vgone(vp); 50612115Sdyson continue; 50712115Sdyson } 50812115Sdyson /* 50912115Sdyson * Step 5: invalidate all cached file data. 51012115Sdyson */ 51122521Sdyson if (vget(vp, LK_EXCLUSIVE, p)) 51212115Sdyson goto loop; 51312115Sdyson if (vinvalbuf(vp, 0, cred, p, 0, 0)) 51412115Sdyson panic("ext2_reload: dirty2"); 51512115Sdyson /* 51612115Sdyson * Step 6: re-read inode data for all active vnodes. 51712115Sdyson */ 51812115Sdyson ip = VTOI(vp); 51912115Sdyson if (error = 52012115Sdyson bread(devvp, fsbtodb(fs, ino_to_fsba(fs, ip->i_number)), 52112115Sdyson (int)fs->s_blocksize, NOCRED, &bp)) { 52212115Sdyson vput(vp); 52312115Sdyson return (error); 52412115Sdyson } 52512115Sdyson ext2_ei2di((struct ext2_inode *) ((char *)bp->b_data + 52612115Sdyson EXT2_INODE_SIZE * ino_to_fsbo(fs, ip->i_number)), 52712115Sdyson &ip->i_din); 52812115Sdyson brelse(bp); 52912115Sdyson vput(vp); 53012115Sdyson if (vp->v_mount != mountp) 53112115Sdyson goto loop; 53212115Sdyson } 53312115Sdyson return (0); 53412115Sdyson} 53512115Sdyson 53612115Sdyson/* 53712115Sdyson * Common code for mount and mountroot 53812115Sdyson */ 53912911Sphkstatic int 54012115Sdysonext2_mountfs(devvp, mp, p) 54112115Sdyson register struct vnode *devvp; 54212115Sdyson struct mount *mp; 54312115Sdyson struct proc *p; 54412115Sdyson{ 54512115Sdyson register struct ufsmount *ump; 54612115Sdyson struct buf *bp; 54712115Sdyson register struct ext2_sb_info *fs; 54812115Sdyson struct ext2_super_block * es; 54912115Sdyson dev_t dev = devvp->v_rdev; 55012115Sdyson struct partinfo dpart; 55112115Sdyson int havepart = 0; 55212115Sdyson int error, i, size; 55312115Sdyson int ronly; 55412115Sdyson 55512115Sdyson /* 55612115Sdyson * Disallow multiple mounts of the same device. 55712115Sdyson * Disallow mounting of a device that is currently in use 55812115Sdyson * (except for root, which might share swap device for miniroot). 55912115Sdyson * Flush out any old buffers remaining from a previous use. 56012115Sdyson */ 56112115Sdyson if (error = vfs_mountedon(devvp)) 56212115Sdyson return (error); 56312115Sdyson if (vcount(devvp) > 1 && devvp != rootvp) 56412115Sdyson return (EBUSY); 56512115Sdyson if (error = vinvalbuf(devvp, V_SAVE, p->p_ucred, p, 0, 0)) 56612115Sdyson return (error); 56712115Sdyson#ifdef READONLY 56812115Sdyson/* turn on this to force it to be read-only */ 56912115Sdyson mp->mnt_flag |= MNT_RDONLY; 57012115Sdyson#endif 57112115Sdyson 57212115Sdyson ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 57312115Sdyson if (error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, p)) 57412115Sdyson return (error); 57512115Sdyson if (VOP_IOCTL(devvp, DIOCGPART, (caddr_t)&dpart, FREAD, NOCRED, p) != 0) 57612115Sdyson size = DEV_BSIZE; 57712115Sdyson else { 57812115Sdyson havepart = 1; 57912115Sdyson size = dpart.disklab->d_secsize; 58012115Sdyson } 58112115Sdyson 58212115Sdyson bp = NULL; 58312115Sdyson ump = NULL; 58412115Sdyson if (error = bread(devvp, SBLOCK, SBSIZE, NOCRED, &bp)) 58512115Sdyson goto out; 58612115Sdyson es = (struct ext2_super_block *)bp->b_data; 58712115Sdyson if (es->s_magic != EXT2_SUPER_MAGIC) { 58812115Sdyson if(es->s_magic == EXT2_PRE_02B_MAGIC) 58912115Sdyson printf("This filesystem bears the magic number of a pre " 59012115Sdyson "0.2b version of ext2. This is not supported by " 59112115Sdyson "Lites.\n"); 59212115Sdyson else 59312115Sdyson printf("Wrong magic number: %x (expected %x for EXT2FS)\n", 59412115Sdyson es->s_magic, EXT2_SUPER_MAGIC); 59512115Sdyson error = EINVAL; /* XXX needs translation */ 59612115Sdyson goto out; 59712115Sdyson } 59812115Sdyson ump = bsd_malloc(sizeof *ump, M_UFSMNT, M_WAITOK); 59912115Sdyson bzero((caddr_t)ump, sizeof *ump); 60030280Sphk ump->um_malloctype = M_EXT2NODE; 60130474Sphk ump->um_blkatoff = ext2_blkatoff; 60230474Sphk ump->um_truncate = ext2_truncate; 60330492Sphk ump->um_update = ext2_update; 60430474Sphk ump->um_valloc = ext2_valloc; 60530474Sphk ump->um_vfree = ext2_vfree; 60612115Sdyson /* I don't know whether this is the right strategy. Note that 60712115Sdyson we dynamically allocate both a ext2_sb_info and a ext2_super_block 60812115Sdyson while Linux keeps the super block in a locked buffer 60912115Sdyson */ 61012115Sdyson ump->um_e2fs = bsd_malloc(sizeof(struct ext2_sb_info), 61112115Sdyson M_UFSMNT, M_WAITOK); 61212115Sdyson ump->um_e2fs->s_es = bsd_malloc(sizeof(struct ext2_super_block), 61312115Sdyson M_UFSMNT, M_WAITOK); 61412115Sdyson bcopy(es, ump->um_e2fs->s_es, (u_int)sizeof(struct ext2_super_block)); 61512115Sdyson if(error = compute_sb_data(devvp, ump->um_e2fs->s_es, ump->um_e2fs)) { 61612115Sdyson brelse(bp); 61712115Sdyson return error; 61812115Sdyson } 61912115Sdyson brelse(bp); 62012115Sdyson bp = NULL; 62112115Sdyson fs = ump->um_e2fs; 62212115Sdyson fs->s_rd_only = ronly; /* ronly is set according to mnt_flags */ 62312115Sdyson if (!(fs->s_es->s_state & EXT2_VALID_FS)) { 62412115Sdyson printf("WARNING: %s was not properly dismounted\n", 62512115Sdyson fs->fs_fsmnt); 62612115Sdyson } 62712115Sdyson /* if the fs is not mounted read-only, make sure the super block is 62812115Sdyson always written back on a sync() 62912115Sdyson */ 63012115Sdyson if (ronly == 0) { 63112115Sdyson fs->s_dirt = 1; /* mark it modified */ 63212115Sdyson fs->s_es->s_state &= ~EXT2_VALID_FS; /* set fs invalid */ 63312115Sdyson } 63412115Sdyson mp->mnt_data = (qaddr_t)ump; 63512115Sdyson mp->mnt_stat.f_fsid.val[0] = (long)dev; 63612115Sdyson mp->mnt_stat.f_fsid.val[1] = MOUNT_EXT2FS; 63712115Sdyson mp->mnt_maxsymlinklen = EXT2_MAXSYMLINKLEN; 63812115Sdyson mp->mnt_flag |= MNT_LOCAL; 63912115Sdyson ump->um_mountp = mp; 64012115Sdyson ump->um_dev = dev; 64112115Sdyson ump->um_devvp = devvp; 64212115Sdyson /* setting those two parameters allows us to use 64312115Sdyson ufs_bmap w/o changse ! 64412115Sdyson */ 64512115Sdyson ump->um_nindir = EXT2_ADDR_PER_BLOCK(fs); 64612115Sdyson ump->um_bptrtodb = fs->s_es->s_log_block_size + 1; 64712115Sdyson ump->um_seqinc = EXT2_FRAGS_PER_BLOCK(fs); 64812115Sdyson for (i = 0; i < MAXQUOTAS; i++) 64912115Sdyson ump->um_quotas[i] = NULLVP; 65034430Seivind devvp->v_specmountpoint = mp; 65134430Seivind if (ronly == 0) 65234430Seivind ext2_sbupdate(ump, MNT_WAIT); 65312115Sdyson return (0); 65412115Sdysonout: 65512115Sdyson if (bp) 65612115Sdyson brelse(bp); 65712115Sdyson (void)VOP_CLOSE(devvp, ronly ? FREAD : FREAD|FWRITE, NOCRED, p); 65812115Sdyson if (ump) { 65912115Sdyson bsd_free(ump->um_fs, M_UFSMNT); 66012115Sdyson bsd_free(ump, M_UFSMNT); 66112115Sdyson mp->mnt_data = (qaddr_t)0; 66212115Sdyson } 66312115Sdyson return (error); 66412115Sdyson} 66512115Sdyson 66612115Sdyson/* 66712115Sdyson * unmount system call 66812115Sdyson */ 66912911Sphkstatic int 67012115Sdysonext2_unmount(mp, mntflags, p) 67112115Sdyson struct mount *mp; 67212115Sdyson int mntflags; 67312115Sdyson struct proc *p; 67412115Sdyson{ 67512115Sdyson register struct ufsmount *ump; 67612115Sdyson register struct ext2_sb_info *fs; 67712115Sdyson int error, flags, ronly, i; 67812115Sdyson 67912115Sdyson flags = 0; 68012115Sdyson if (mntflags & MNT_FORCE) { 68112115Sdyson if (mp->mnt_flag & MNT_ROOTFS) 68212115Sdyson return (EINVAL); 68312115Sdyson flags |= FORCECLOSE; 68412115Sdyson } 68512115Sdyson if (error = ext2_flushfiles(mp, flags, p)) 68612115Sdyson return (error); 68712115Sdyson ump = VFSTOUFS(mp); 68812115Sdyson fs = ump->um_e2fs; 68912115Sdyson ronly = fs->s_rd_only; 69012115Sdyson if (!ronly) { 69112115Sdyson fs->s_es->s_state |= EXT2_VALID_FS; /* was fs_clean = 1 */ 69212115Sdyson ext2_sbupdate(ump, MNT_WAIT); 69312115Sdyson } 69427881Sdyson 69512115Sdyson /* release buffers containing group descriptors */ 69612115Sdyson for(i = 0; i < fs->s_db_per_group; i++) 69727881Sdyson ULCK_BUF(fs->s_group_desc[i]) 69827881Sdyson 69912115Sdyson /* release cached inode/block bitmaps */ 70012115Sdyson for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++) 70112115Sdyson if (fs->s_inode_bitmap[i]) 70227881Sdyson ULCK_BUF(fs->s_inode_bitmap[i]) 70327881Sdyson 70412115Sdyson for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++) 70512115Sdyson if (fs->s_block_bitmap[i]) 70627881Sdyson ULCK_BUF(fs->s_block_bitmap[i]) 70712115Sdyson 70834430Seivind ump->um_devvp->v_specmountpoint = NULL; 70912115Sdyson error = VOP_CLOSE(ump->um_devvp, ronly ? FREAD : FREAD|FWRITE, 71012115Sdyson NOCRED, p); 71112115Sdyson vrele(ump->um_devvp); 71212115Sdyson bsd_free(fs->s_es, M_UFSMNT); 71312115Sdyson bsd_free(fs, M_UFSMNT); 71412115Sdyson bsd_free(ump, M_UFSMNT); 71512115Sdyson mp->mnt_data = (qaddr_t)0; 71612115Sdyson mp->mnt_flag &= ~MNT_LOCAL; 71712115Sdyson return (error); 71812115Sdyson} 71912115Sdyson 72012115Sdyson/* 72112115Sdyson * Flush out all the files in a filesystem. 72212115Sdyson */ 72312911Sphkstatic int 72412115Sdysonext2_flushfiles(mp, flags, p) 72512115Sdyson register struct mount *mp; 72612115Sdyson int flags; 72712115Sdyson struct proc *p; 72812115Sdyson{ 72912115Sdyson register struct ufsmount *ump; 73012147Sdyson int error; 73112746Sbde#if QUOTA 73212746Sbde int i; 73312746Sbde#endif 73412115Sdyson 73512115Sdyson ump = VFSTOUFS(mp); 73612115Sdyson#if QUOTA 73712115Sdyson if (mp->mnt_flag & MNT_QUOTA) { 73812115Sdyson if (error = vflush(mp, NULLVP, SKIPSYSTEM|flags)) 73912115Sdyson return (error); 74012115Sdyson for (i = 0; i < MAXQUOTAS; i++) { 74112115Sdyson if (ump->um_quotas[i] == NULLVP) 74212115Sdyson continue; 74312115Sdyson quotaoff(p, mp, i); 74412115Sdyson } 74512115Sdyson /* 74612115Sdyson * Here we fall through to vflush again to ensure 74712115Sdyson * that we have gotten rid of all the system vnodes. 74812115Sdyson */ 74912115Sdyson } 75012115Sdyson#endif 75112115Sdyson error = vflush(mp, NULLVP, flags); 75212115Sdyson return (error); 75312115Sdyson} 75412115Sdyson 75512115Sdyson/* 75612115Sdyson * Get file system statistics. 75712115Sdyson * taken from ext2/super.c ext2_statfs 75812115Sdyson */ 75912911Sphkstatic int 76012115Sdysonext2_statfs(mp, sbp, p) 76112115Sdyson struct mount *mp; 76212115Sdyson register struct statfs *sbp; 76312115Sdyson struct proc *p; 76412115Sdyson{ 76512115Sdyson unsigned long overhead; 76612115Sdyson unsigned long overhead_per_group; 76712115Sdyson 76812115Sdyson register struct ufsmount *ump; 76912115Sdyson register struct ext2_sb_info *fs; 77012115Sdyson register struct ext2_super_block *es; 77112115Sdyson 77212115Sdyson ump = VFSTOUFS(mp); 77312115Sdyson fs = ump->um_e2fs; 77412115Sdyson es = fs->s_es; 77512115Sdyson 77612115Sdyson if (es->s_magic != EXT2_SUPER_MAGIC) 77712115Sdyson panic("ext2_statfs - magic number spoiled"); 77812115Sdyson 77912115Sdyson /* 78012115Sdyson * Compute the overhead (FS structures) 78112115Sdyson */ 78212115Sdyson overhead_per_group = 1 /* super block */ + 78312115Sdyson fs->s_db_per_group + 78412115Sdyson 1 /* block bitmap */ + 78512115Sdyson 1 /* inode bitmap */ + 78612115Sdyson fs->s_itb_per_group; 78712115Sdyson overhead = es->s_first_data_block + 78812115Sdyson fs->s_groups_count * overhead_per_group; 78912115Sdyson 79012115Sdyson sbp->f_type = MOUNT_EXT2FS; 79112115Sdyson sbp->f_bsize = EXT2_FRAG_SIZE(fs); 79212115Sdyson sbp->f_iosize = EXT2_BLOCK_SIZE(fs); 79312115Sdyson sbp->f_blocks = es->s_blocks_count - overhead; 79412115Sdyson sbp->f_bfree = es->s_free_blocks_count; 79512115Sdyson sbp->f_bavail = sbp->f_bfree - es->s_r_blocks_count; 79612115Sdyson sbp->f_files = es->s_inodes_count; 79712115Sdyson sbp->f_ffree = es->s_free_inodes_count; 79812115Sdyson if (sbp != &mp->mnt_stat) { 79912115Sdyson bcopy((caddr_t)mp->mnt_stat.f_mntonname, 80012115Sdyson (caddr_t)&sbp->f_mntonname[0], MNAMELEN); 80112115Sdyson bcopy((caddr_t)mp->mnt_stat.f_mntfromname, 80212115Sdyson (caddr_t)&sbp->f_mntfromname[0], MNAMELEN); 80312115Sdyson } 80412115Sdyson return (0); 80512115Sdyson} 80612115Sdyson 80712115Sdyson/* 80812115Sdyson * Go through the disk queues to initiate sandbagged IO; 80912115Sdyson * go through the inodes to write those that have been modified; 81012115Sdyson * initiate the writing of the super block if it has been modified. 81112115Sdyson * 81212115Sdyson * Note: we are always called with the filesystem marked `MPBUSY'. 81312115Sdyson */ 81412911Sphkstatic int 81512115Sdysonext2_sync(mp, waitfor, cred, p) 81612115Sdyson struct mount *mp; 81712115Sdyson int waitfor; 81812115Sdyson struct ucred *cred; 81912115Sdyson struct proc *p; 82012115Sdyson{ 82112115Sdyson register struct vnode *vp; 82212115Sdyson register struct inode *ip; 82312115Sdyson register struct ufsmount *ump = VFSTOUFS(mp); 82412115Sdyson register struct ext2_sb_info *fs; 82512115Sdyson int error, allerror = 0; 82612115Sdyson 82712115Sdyson fs = ump->um_e2fs; 82812115Sdyson /* 82912115Sdyson * Write back modified superblock. 83012115Sdyson * Consistency check that the superblock 83112115Sdyson * is still in the buffer cache. 83212115Sdyson */ 83312115Sdyson if (fs->s_dirt) { 83412115Sdyson if (fs->s_rd_only != 0) { /* XXX */ 83512115Sdyson printf("fs = %s\n", fs->fs_fsmnt); 83612115Sdyson panic("update: rofs mod"); 83712115Sdyson } 83812115Sdyson fs->s_dirt = 0; 83934961Sphk fs->s_es->s_wtime = time_second; 84012115Sdyson allerror = ext2_sbupdate(ump, waitfor); 84112115Sdyson } 84212115Sdyson /* 84312115Sdyson * Write back each (modified) inode. 84412115Sdyson */ 84512115Sdysonloop: 84612115Sdyson for (vp = mp->mnt_vnodelist.lh_first; 84712115Sdyson vp != NULL; 84812115Sdyson vp = vp->v_mntvnodes.le_next) { 84912115Sdyson /* 85012115Sdyson * If the vnode that we are about to sync is no longer 85112115Sdyson * associated with this mount point, start over. 85212115Sdyson */ 85312115Sdyson if (vp->v_mount != mp) 85412115Sdyson goto loop; 85512115Sdyson if (VOP_ISLOCKED(vp)) 85612115Sdyson continue; 85712115Sdyson ip = VTOI(vp); 85812115Sdyson if ((ip->i_flag & 85912115Sdyson (IN_ACCESS | IN_CHANGE | IN_MODIFIED | IN_UPDATE)) == 0 && 86012115Sdyson vp->v_dirtyblkhd.lh_first == NULL) 86112115Sdyson continue; 86222521Sdyson if (vget(vp, LK_EXCLUSIVE, p)) 86312115Sdyson goto loop; 86412115Sdyson if (error = VOP_FSYNC(vp, cred, waitfor, p)) 86512115Sdyson allerror = error; 86612115Sdyson vput(vp); 86712115Sdyson } 86812115Sdyson /* 86912115Sdyson * Force stale file system control information to be flushed. 87012115Sdyson */ 87112115Sdyson if (error = VOP_FSYNC(ump->um_devvp, cred, waitfor, p)) 87212115Sdyson allerror = error; 87312115Sdyson#if QUOTA 87412115Sdyson qsync(mp); 87512115Sdyson#endif 87612115Sdyson return (allerror); 87712115Sdyson} 87812115Sdyson 87912115Sdyson/* 88012115Sdyson * Look up a EXT2FS dinode number to find its incore vnode, otherwise read it 88112115Sdyson * in from disk. If it is in core, wait for the lock bit to clear, then 88212115Sdyson * return the inode locked. Detection and handling of mount points must be 88312115Sdyson * done by the calling routine. 88412115Sdyson */ 88512911Sphkstatic int 88612115Sdysonext2_vget(mp, ino, vpp) 88712115Sdyson struct mount *mp; 88812115Sdyson ino_t ino; 88912115Sdyson struct vnode **vpp; 89012115Sdyson{ 89112115Sdyson register struct ext2_sb_info *fs; 89212115Sdyson register struct inode *ip; 89312115Sdyson struct ufsmount *ump; 89412115Sdyson struct buf *bp; 89512115Sdyson struct vnode *vp; 89612115Sdyson dev_t dev; 89730280Sphk int i, error; 89812115Sdyson int used_blocks; 89912115Sdyson 90012115Sdyson ump = VFSTOUFS(mp); 90112115Sdyson dev = ump->um_dev; 90212406Sdysonrestart: 90312115Sdyson if ((*vpp = ufs_ihashget(dev, ino)) != NULL) 90412115Sdyson return (0); 90512115Sdyson 90612406Sdyson /* 90712406Sdyson * Lock out the creation of new entries in the FFS hash table in 90812406Sdyson * case getnewvnode() or MALLOC() blocks, otherwise a duplicate 90912406Sdyson * may occur! 91012406Sdyson */ 91112406Sdyson if (ext2fs_inode_hash_lock) { 91212406Sdyson while (ext2fs_inode_hash_lock) { 91312406Sdyson ext2fs_inode_hash_lock = -1; 91436102Sbde tsleep(&ext2fs_inode_hash_lock, PVM, "e2vget", 0); 91512406Sdyson } 91612406Sdyson goto restart; 91712406Sdyson } 91812406Sdyson ext2fs_inode_hash_lock = 1; 91912406Sdyson 92036102Sbde /* 92136102Sbde * If this MALLOC() is performed after the getnewvnode() 92236102Sbde * it might block, leaving a vnode with a NULL v_data to be 92336102Sbde * found by ext2_sync() if a sync happens to fire right then, 92436102Sbde * which will cause a panic because ext2_sync() blindly 92536102Sbde * dereferences vp->v_data (as well it should). 92636102Sbde */ 92736102Sbde MALLOC(ip, struct inode *, sizeof(struct inode), M_EXT2NODE, M_WAITOK); 92836102Sbde 92912115Sdyson /* Allocate a new vnode/inode. */ 93012115Sdyson if (error = getnewvnode(VT_UFS, mp, ext2_vnodeop_p, &vp)) { 93136102Sbde if (ext2fs_inode_hash_lock < 0) 93236102Sbde wakeup(&ext2fs_inode_hash_lock); 93336102Sbde ext2fs_inode_hash_lock = 0; 93412115Sdyson *vpp = NULL; 93536102Sbde FREE(ip, M_EXT2NODE); 93612115Sdyson return (error); 93712115Sdyson } 93812115Sdyson bzero((caddr_t)ip, sizeof(struct inode)); 93912115Sdyson vp->v_data = ip; 94012115Sdyson ip->i_vnode = vp; 94112115Sdyson ip->i_e2fs = fs = ump->um_e2fs; 94212115Sdyson ip->i_dev = dev; 94312115Sdyson ip->i_number = ino; 94412115Sdyson#if QUOTA 94512115Sdyson for (i = 0; i < MAXQUOTAS; i++) 94612115Sdyson ip->i_dquot[i] = NODQUOT; 94712115Sdyson#endif 94812115Sdyson /* 94912115Sdyson * Put it onto its hash chain and lock it so that other requests for 95012115Sdyson * this inode will block if they arrive while we are sleeping waiting 95112115Sdyson * for old data structures to be purged or for the contents of the 95212115Sdyson * disk portion of this inode to be read. 95312115Sdyson */ 95412115Sdyson ufs_ihashins(ip); 95512115Sdyson 95612406Sdyson if (ext2fs_inode_hash_lock < 0) 95712406Sdyson wakeup(&ext2fs_inode_hash_lock); 95812406Sdyson ext2fs_inode_hash_lock = 0; 95912406Sdyson 96012115Sdyson /* Read in the disk contents for the inode, copy into the inode. */ 96112115Sdyson#if 0 96212115Sdysonprintf("ext2_vget(%d) dbn= %d ", ino, fsbtodb(fs, ino_to_fsba(fs, ino))); 96312115Sdyson#endif 96412115Sdyson if (error = bread(ump->um_devvp, fsbtodb(fs, ino_to_fsba(fs, ino)), 96512115Sdyson (int)fs->s_blocksize, NOCRED, &bp)) { 96612115Sdyson /* 96712115Sdyson * The inode does not contain anything useful, so it would 96812115Sdyson * be misleading to leave it on its hash chain. With mode 96912115Sdyson * still zero, it will be unlinked and returned to the free 97012115Sdyson * list by vput(). 97112115Sdyson */ 97212115Sdyson vput(vp); 97312115Sdyson brelse(bp); 97412115Sdyson *vpp = NULL; 97512115Sdyson return (error); 97612115Sdyson } 97712115Sdyson /* convert ext2 inode to dinode */ 97812115Sdyson ext2_ei2di((struct ext2_inode *) ((char *)bp->b_data + EXT2_INODE_SIZE * 97912115Sdyson ino_to_fsbo(fs, ino)), &ip->i_din); 98012115Sdyson ip->i_block_group = ino_to_cg(fs, ino); 98112115Sdyson ip->i_next_alloc_block = 0; 98212115Sdyson ip->i_next_alloc_goal = 0; 98312115Sdyson ip->i_prealloc_count = 0; 98412115Sdyson ip->i_prealloc_block = 0; 98512115Sdyson /* now we want to make sure that block pointers for unused 98612115Sdyson blocks are zeroed out - ext2_balloc depends on this 98712115Sdyson although for regular files and directories only 98812115Sdyson */ 98912115Sdyson if(S_ISDIR(ip->i_mode) || S_ISREG(ip->i_mode)) { 99012115Sdyson used_blocks = (ip->i_size+fs->s_blocksize-1) / fs->s_blocksize; 99112115Sdyson for(i = used_blocks; i < EXT2_NDIR_BLOCKS; i++) 99212115Sdyson ip->i_db[i] = 0; 99312115Sdyson } 99412115Sdyson/* 99512115Sdyson ext2_print_inode(ip); 99612115Sdyson*/ 99712115Sdyson brelse(bp); 99812115Sdyson 99912115Sdyson /* 100012115Sdyson * Initialize the vnode from the inode, check for aliases. 100112115Sdyson * Note that the underlying vnode may have changed. 100212115Sdyson */ 100314249Sbde if (error = ufs_vinit(mp, ext2_specop_p, ext2_fifoop_p, &vp)) { 100412115Sdyson vput(vp); 100512115Sdyson *vpp = NULL; 100612115Sdyson return (error); 100712115Sdyson } 100812115Sdyson /* 100912115Sdyson * Finish inode initialization now that aliasing has been resolved. 101012115Sdyson */ 101112115Sdyson ip->i_devvp = ump->um_devvp; 101212115Sdyson VREF(ip->i_devvp); 101312115Sdyson /* 101412115Sdyson * Set up a generation number for this inode if it does not 101512115Sdyson * already have one. This should only happen on old filesystems. 101612115Sdyson */ 101712115Sdyson if (ip->i_gen == 0) { 101831485Sbde ip->i_gen = random() / 2 + 1; 101912115Sdyson if ((vp->v_mount->mnt_flag & MNT_RDONLY) == 0) 102012115Sdyson ip->i_flag |= IN_MODIFIED; 102112115Sdyson } 102212115Sdyson *vpp = vp; 102312115Sdyson return (0); 102412115Sdyson} 102512115Sdyson 102612115Sdyson/* 102712115Sdyson * File handle to vnode 102812115Sdyson * 102912115Sdyson * Have to be really careful about stale file handles: 103012115Sdyson * - check that the inode number is valid 103112115Sdyson * - call ext2_vget() to get the locked inode 103212115Sdyson * - check for an unallocated inode (i_mode == 0) 103312115Sdyson * - check that the given client host has export rights and return 103412115Sdyson * those rights via. exflagsp and credanonp 103512115Sdyson */ 103612911Sphkstatic int 103712115Sdysonext2_fhtovp(mp, fhp, nam, vpp, exflagsp, credanonp) 103812115Sdyson register struct mount *mp; 103912115Sdyson struct fid *fhp; 104028270Swollman struct sockaddr *nam; 104112115Sdyson struct vnode **vpp; 104212115Sdyson int *exflagsp; 104312115Sdyson struct ucred **credanonp; 104412115Sdyson{ 104512115Sdyson register struct ufid *ufhp; 104612115Sdyson struct ext2_sb_info *fs; 104712115Sdyson 104812115Sdyson ufhp = (struct ufid *)fhp; 104912115Sdyson fs = VFSTOUFS(mp)->um_e2fs; 105012115Sdyson if (ufhp->ufid_ino < ROOTINO || 105112115Sdyson ufhp->ufid_ino >= fs->s_groups_count * fs->s_es->s_inodes_per_group) 105212115Sdyson return (ESTALE); 105312115Sdyson return (ufs_check_export(mp, ufhp, nam, vpp, exflagsp, credanonp)); 105412115Sdyson} 105512115Sdyson 105612115Sdyson/* 105712115Sdyson * Vnode pointer to File handle 105812115Sdyson */ 105912115Sdyson/* ARGSUSED */ 106012911Sphkstatic int 106112115Sdysonext2_vptofh(vp, fhp) 106212115Sdyson struct vnode *vp; 106312115Sdyson struct fid *fhp; 106412115Sdyson{ 106512115Sdyson register struct inode *ip; 106612115Sdyson register struct ufid *ufhp; 106712115Sdyson 106812115Sdyson ip = VTOI(vp); 106912115Sdyson ufhp = (struct ufid *)fhp; 107012115Sdyson ufhp->ufid_len = sizeof(struct ufid); 107112115Sdyson ufhp->ufid_ino = ip->i_number; 107212115Sdyson ufhp->ufid_gen = ip->i_gen; 107312115Sdyson return (0); 107412115Sdyson} 107512115Sdyson 107612115Sdyson/* 107712115Sdyson * Write a superblock and associated information back to disk. 107812115Sdyson */ 107912911Sphkstatic int 108012115Sdysonext2_sbupdate(mp, waitfor) 108112115Sdyson struct ufsmount *mp; 108212115Sdyson int waitfor; 108312115Sdyson{ 108412115Sdyson register struct ext2_sb_info *fs = mp->um_e2fs; 108512115Sdyson register struct ext2_super_block *es = fs->s_es; 108612115Sdyson register struct buf *bp; 108712147Sdyson int i, error = 0; 108812115Sdyson/* 108912115Sdysonprintf("\nupdating superblock, waitfor=%s\n", waitfor == MNT_WAIT ? "yes":"no"); 109012115Sdyson*/ 109112115Sdyson bp = getblk(mp->um_devvp, SBLOCK, SBSIZE, 0, 0); 109212115Sdyson bcopy((caddr_t)es, bp->b_data, (u_int)sizeof(struct ext2_super_block)); 109312115Sdyson if (waitfor == MNT_WAIT) 109412115Sdyson error = bwrite(bp); 109512115Sdyson else 109612115Sdyson bawrite(bp); 109712115Sdyson 109827881Sdyson /* 109927881Sdyson * The buffers for group descriptors, inode bitmaps and block bitmaps 110027881Sdyson * are not busy at this point and are (hopefully) written by the 110127881Sdyson * usual sync mechanism. No need to write them here 110212115Sdyson */ 110312115Sdyson 110412115Sdyson return (error); 110512115Sdyson} 1106