1 /* $OpenBSD: mfs_vfsops.c,v 1.52 2016/09/08 16:57:29 tedu Exp $ */ 2 /* $NetBSD: mfs_vfsops.c,v 1.10 1996/02/09 22:31:28 christos Exp $ */ 3 4 /* 5 * Copyright (c) 1989, 1990, 1993, 1994 6 * The Regents of the University of California. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * @(#)mfs_vfsops.c 8.4 (Berkeley) 4/16/94 33 */ 34 35 #include <sys/param.h> 36 #include <sys/systm.h> 37 #include <sys/time.h> 38 #include <sys/proc.h> 39 #include <sys/buf.h> 40 #include <sys/mount.h> 41 #include <sys/signalvar.h> 42 #include <sys/vnode.h> 43 #include <sys/malloc.h> 44 #include <sys/kthread.h> 45 46 #include <ufs/ufs/quota.h> 47 #include <ufs/ufs/inode.h> 48 #include <ufs/ufs/ufsmount.h> 49 #include <ufs/ufs/ufs_extern.h> 50 51 #include <ufs/ffs/fs.h> 52 #include <ufs/ffs/ffs_extern.h> 53 54 #include <ufs/mfs/mfsnode.h> 55 #include <ufs/mfs/mfs_extern.h> 56 57 static int mfs_minor; /* used for building internal dev_t */ 58 59 /* 60 * mfs vfs operations. 61 */ 62 const struct vfsops mfs_vfsops = { 63 mfs_mount, 64 mfs_start, 65 ffs_unmount, 66 ufs_root, 67 ufs_quotactl, 68 ffs_statfs, 69 ffs_sync, 70 ffs_vget, 71 ffs_fhtovp, 72 ffs_vptofh, 73 mfs_init, 74 ffs_sysctl, 75 mfs_checkexp 76 }; 77 78 /* 79 * VFS Operations. 80 * 81 * mount system call 82 */ 83 int 84 mfs_mount(struct mount *mp, const char *path, void *data, 85 struct nameidata *ndp, struct proc *p) 86 { 87 struct vnode *devvp; 88 struct mfs_args args; 89 struct ufsmount *ump; 90 struct fs *fs; 91 struct mfsnode *mfsp; 92 char fspec[MNAMELEN]; 93 int flags, error; 94 95 error = copyin(data, &args, sizeof(struct mfs_args)); 96 if (error) 97 return (error); 98 99 /* 100 * If updating, check whether changing from read-only to 101 * read/write; if there is no device name, that's all we do. 102 */ 103 if (mp->mnt_flag & MNT_UPDATE) { 104 ump = VFSTOUFS(mp); 105 fs = ump->um_fs; 106 if (fs->fs_ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) { 107 flags = WRITECLOSE; 108 if (mp->mnt_flag & MNT_FORCE) 109 flags |= FORCECLOSE; 110 error = ffs_flushfiles(mp, flags, p); 111 if (error) 112 return (error); 113 } 114 if (fs->fs_ronly && (mp->mnt_flag & MNT_WANTRDWR)) 115 fs->fs_ronly = 0; 116 #ifdef EXPORTMFS 117 if (args.fspec == NULL) 118 return (vfs_export(mp, &ump->um_export, 119 &args.export_info)); 120 #endif 121 return (0); 122 } 123 error = copyinstr(args.fspec, fspec, sizeof(fspec), NULL); 124 if (error) 125 return (error); 126 error = getnewvnode(VT_MFS, NULL, &mfs_vops, &devvp); 127 if (error) 128 return (error); 129 devvp->v_type = VBLK; 130 if (checkalias(devvp, makedev(255, mfs_minor), NULL)) 131 panic("mfs_mount: dup dev"); 132 mfs_minor++; 133 mfsp = malloc(sizeof *mfsp, M_MFSNODE, M_WAITOK | M_ZERO); 134 devvp->v_data = mfsp; 135 mfsp->mfs_baseoff = args.base; 136 mfsp->mfs_size = args.size; 137 mfsp->mfs_vnode = devvp; 138 mfsp->mfs_pid = p->p_pid; 139 bufq_init(&mfsp->mfs_bufq, BUFQ_FIFO); 140 if ((error = ffs_mountfs(devvp, mp, p)) != 0) { 141 mfsp->mfs_shutdown = 1; 142 vrele(devvp); 143 return (error); 144 } 145 ump = VFSTOUFS(mp); 146 fs = ump->um_fs; 147 148 memset(fs->fs_fsmnt, 0, sizeof(fs->fs_fsmnt)); 149 strlcpy(fs->fs_fsmnt, path, sizeof(fs->fs_fsmnt)); 150 memcpy(mp->mnt_stat.f_mntonname, fs->fs_fsmnt, MNAMELEN); 151 memset(mp->mnt_stat.f_mntfromname, 0, MNAMELEN); 152 strlcpy(mp->mnt_stat.f_mntfromname, fspec, MNAMELEN); 153 memset(mp->mnt_stat.f_mntfromspec, 0, MNAMELEN); 154 strlcpy(mp->mnt_stat.f_mntfromspec, fspec, MNAMELEN); 155 memcpy(&mp->mnt_stat.mount_info.mfs_args, &args, sizeof(args)); 156 157 return (0); 158 } 159 160 /* 161 * Used to grab the process and keep it in the kernel to service 162 * memory filesystem I/O requests. 163 * 164 * Loop servicing I/O requests. 165 * Copy the requested data into or out of the memory filesystem 166 * address space. 167 */ 168 int 169 mfs_start(struct mount *mp, int flags, struct proc *p) 170 { 171 struct vnode *vp = VFSTOUFS(mp)->um_devvp; 172 struct mfsnode *mfsp = VTOMFS(vp); 173 struct buf *bp; 174 int sleepreturn = 0; 175 176 while (1) { 177 while (1) { 178 if (mfsp->mfs_shutdown == 1) 179 break; 180 bp = bufq_dequeue(&mfsp->mfs_bufq); 181 if (bp == NULL) 182 break; 183 mfs_doio(mfsp, bp); 184 wakeup(bp); 185 } 186 if (mfsp->mfs_shutdown == 1) 187 break; 188 189 /* 190 * If a non-ignored signal is received, try to unmount. 191 * If that fails, clear the signal (it has been "processed"), 192 * otherwise we will loop here, as tsleep will always return 193 * EINTR/ERESTART. 194 */ 195 if (sleepreturn != 0) { 196 if (vfs_busy(mp, VB_WRITE|VB_NOWAIT) || 197 dounmount(mp, 198 (CURSIG(p) == SIGKILL) ? MNT_FORCE : 0, p, NULL)) 199 CLRSIG(p, CURSIG(p)); 200 sleepreturn = 0; 201 continue; 202 } 203 sleepreturn = tsleep(vp, PWAIT | PCATCH, "mfsidl", 0); 204 } 205 return (0); 206 } 207 208 /* 209 * check export permission, not supported 210 */ 211 int 212 mfs_checkexp(struct mount *mp, struct mbuf *nam, int *exflagsp, 213 struct ucred **credanonp) 214 { 215 return (EOPNOTSUPP); 216 } 217 218 /* 219 * Memory based filesystem initialization. 220 */ 221 int 222 mfs_init(struct vfsconf *vfsp) 223 { 224 return (ffs_init(vfsp)); 225 } 226