1 /* 2 * Copyright (c) 1989, 1990, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 * 7 * @(#)mfs_vfsops.c 8.10 (Berkeley) 05/20/95 8 */ 9 10 #include <sys/param.h> 11 #include <sys/systm.h> 12 #include <sys/time.h> 13 #include <sys/kernel.h> 14 #include <sys/proc.h> 15 #include <sys/buf.h> 16 #include <sys/mount.h> 17 #include <sys/signalvar.h> 18 #include <sys/vnode.h> 19 #include <sys/malloc.h> 20 21 #include <ufs/ufs/quota.h> 22 #include <ufs/ufs/inode.h> 23 #include <ufs/ufs/ufsmount.h> 24 #include <ufs/ufs/ufs_extern.h> 25 26 #include <ufs/ffs/fs.h> 27 #include <ufs/ffs/ffs_extern.h> 28 29 #include <ufs/mfs/mfsnode.h> 30 #include <ufs/mfs/mfs_extern.h> 31 32 caddr_t mfs_rootbase; /* address of mini-root in kernel virtual memory */ 33 u_long mfs_rootsize; /* size of mini-root in bytes */ 34 35 static int mfs_minor; /* used for building internal dev_t */ 36 37 extern int (**mfs_vnodeop_p)(); 38 39 /* 40 * mfs vfs operations. 41 */ 42 struct vfsops mfs_vfsops = { 43 mfs_mount, 44 mfs_start, 45 ffs_unmount, 46 ufs_root, 47 ufs_quotactl, 48 mfs_statfs, 49 ffs_sync, 50 ffs_vget, 51 ffs_fhtovp, 52 ffs_vptofh, 53 mfs_init, 54 ffs_sysctl, 55 }; 56 57 /* 58 * Called by main() when mfs is going to be mounted as root. 59 */ 60 mfs_mountroot() 61 { 62 extern struct vnode *rootvp; 63 struct fs *fs; 64 struct mount *mp; 65 struct proc *p = curproc; /* XXX */ 66 struct ufsmount *ump; 67 struct mfsnode *mfsp; 68 int error; 69 70 /* 71 * Get vnodes for swapdev and rootdev. 72 */ 73 if ((error = bdevvp(swapdev, &swapdev_vp)) || 74 (error = bdevvp(rootdev, &rootvp))) { 75 printf("mfs_mountroot: can't setup bdevvp's"); 76 return (error); 77 } 78 if (error = vfs_rootmountalloc("mfs", "mfs_root", &mp)) 79 return (error); 80 mfsp = malloc(sizeof *mfsp, M_MFSNODE, M_WAITOK); 81 rootvp->v_data = mfsp; 82 rootvp->v_op = mfs_vnodeop_p; 83 rootvp->v_tag = VT_MFS; 84 mfsp->mfs_baseoff = mfs_rootbase; 85 mfsp->mfs_size = mfs_rootsize; 86 mfsp->mfs_vnode = rootvp; 87 mfsp->mfs_pid = p->p_pid; 88 mfsp->mfs_buflist = (struct buf *)0; 89 if (error = ffs_mountfs(rootvp, mp, p)) { 90 mp->mnt_vfc->vfc_refcount--; 91 vfs_unbusy(mp, p); 92 free(mp, M_MOUNT); 93 free(mfsp, M_MFSNODE); 94 return (error); 95 } 96 simple_lock(&mountlist_slock); 97 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 98 simple_unlock(&mountlist_slock); 99 ump = VFSTOUFS(mp); 100 fs = ump->um_fs; 101 (void) copystr(mp->mnt_stat.f_mntonname, fs->fs_fsmnt, MNAMELEN - 1, 0); 102 (void)ffs_statfs(mp, &mp->mnt_stat, p); 103 vfs_unbusy(mp, p); 104 inittodr((time_t)0); 105 return (0); 106 } 107 108 /* 109 * This is called early in boot to set the base address and size 110 * of the mini-root. 111 */ 112 mfs_initminiroot(base) 113 caddr_t base; 114 { 115 struct fs *fs = (struct fs *)(base + SBOFF); 116 extern int (*mountroot)(); 117 118 /* check for valid super block */ 119 if (fs->fs_magic != FS_MAGIC || fs->fs_bsize > MAXBSIZE || 120 fs->fs_bsize < sizeof(struct fs)) 121 return (0); 122 mountroot = mfs_mountroot; 123 mfs_rootbase = base; 124 mfs_rootsize = fs->fs_fsize * fs->fs_size; 125 rootdev = makedev(255, mfs_minor++); 126 return (mfs_rootsize); 127 } 128 129 /* 130 * VFS Operations. 131 * 132 * mount system call 133 */ 134 /* ARGSUSED */ 135 int 136 mfs_mount(mp, path, data, ndp, p) 137 register struct mount *mp; 138 char *path; 139 caddr_t data; 140 struct nameidata *ndp; 141 struct proc *p; 142 { 143 struct vnode *devvp; 144 struct mfs_args args; 145 struct ufsmount *ump; 146 register struct fs *fs; 147 register struct mfsnode *mfsp; 148 u_int size; 149 int flags, error; 150 151 if (error = copyin(data, (caddr_t)&args, sizeof (struct mfs_args))) 152 return (error); 153 154 /* 155 * If updating, check whether changing from read-only to 156 * read/write; if there is no device name, that's all we do. 157 */ 158 if (mp->mnt_flag & MNT_UPDATE) { 159 ump = VFSTOUFS(mp); 160 fs = ump->um_fs; 161 if (fs->fs_ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) { 162 flags = WRITECLOSE; 163 if (mp->mnt_flag & MNT_FORCE) 164 flags |= FORCECLOSE; 165 if (error = ffs_flushfiles(mp, flags, p)) 166 return (error); 167 } 168 if (fs->fs_ronly && (mp->mnt_flag & MNT_WANTRDWR)) 169 fs->fs_ronly = 0; 170 #ifdef EXPORTMFS 171 if (args.fspec == 0) 172 return (vfs_export(mp, &ump->um_export, &args.export)); 173 #endif 174 return (0); 175 } 176 error = getnewvnode(VT_MFS, (struct mount *)0, mfs_vnodeop_p, &devvp); 177 if (error) 178 return (error); 179 devvp->v_type = VBLK; 180 if (checkalias(devvp, makedev(255, mfs_minor++), (struct mount *)0)) 181 panic("mfs_mount: dup dev"); 182 mfsp = (struct mfsnode *)malloc(sizeof *mfsp, M_MFSNODE, M_WAITOK); 183 devvp->v_data = mfsp; 184 mfsp->mfs_baseoff = args.base; 185 mfsp->mfs_size = args.size; 186 mfsp->mfs_vnode = devvp; 187 mfsp->mfs_pid = p->p_pid; 188 mfsp->mfs_buflist = (struct buf *)0; 189 if (error = ffs_mountfs(devvp, mp, p)) { 190 mfsp->mfs_buflist = (struct buf *)-1; 191 vrele(devvp); 192 return (error); 193 } 194 ump = VFSTOUFS(mp); 195 fs = ump->um_fs; 196 (void) copyinstr(path, fs->fs_fsmnt, sizeof(fs->fs_fsmnt) - 1, &size); 197 bzero(fs->fs_fsmnt + size, sizeof(fs->fs_fsmnt) - size); 198 bcopy((caddr_t)fs->fs_fsmnt, (caddr_t)mp->mnt_stat.f_mntonname, 199 MNAMELEN); 200 (void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 201 &size); 202 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 203 (void) mfs_statfs(mp, &mp->mnt_stat, p); 204 return (0); 205 } 206 207 int mfs_pri = PWAIT | PCATCH; /* XXX prob. temp */ 208 209 /* 210 * Used to grab the process and keep it in the kernel to service 211 * memory filesystem I/O requests. 212 * 213 * Loop servicing I/O requests. 214 * Copy the requested data into or out of the memory filesystem 215 * address space. 216 */ 217 /* ARGSUSED */ 218 int 219 mfs_start(mp, flags, p) 220 struct mount *mp; 221 int flags; 222 struct proc *p; 223 { 224 register struct vnode *vp = VFSTOUFS(mp)->um_devvp; 225 register struct mfsnode *mfsp = VTOMFS(vp); 226 register struct buf *bp; 227 register caddr_t base; 228 int error = 0; 229 230 base = mfsp->mfs_baseoff; 231 while (mfsp->mfs_buflist != (struct buf *)(-1)) { 232 while (bp = mfsp->mfs_buflist) { 233 mfsp->mfs_buflist = bp->b_actf; 234 mfs_doio(bp, base); 235 wakeup((caddr_t)bp); 236 } 237 /* 238 * If a non-ignored signal is received, try to unmount. 239 * If that fails, clear the signal (it has been "processed"), 240 * otherwise we will loop here, as tsleep will always return 241 * EINTR/ERESTART. 242 */ 243 if (error = tsleep((caddr_t)vp, mfs_pri, "mfsidl", 0)) 244 if (dounmount(mp, 0, p) != 0) 245 CLRSIG(p, CURSIG(p)); 246 } 247 return (error); 248 } 249 250 /* 251 * Get file system statistics. 252 */ 253 mfs_statfs(mp, sbp, p) 254 struct mount *mp; 255 struct statfs *sbp; 256 struct proc *p; 257 { 258 int error; 259 260 error = ffs_statfs(mp, sbp, p); 261 sbp->f_type = mp->mnt_vfc->vfc_typenum; 262 return (error); 263 } 264