1 /* 2 * Copyright (c) 1989, 1990, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 * 7 * @(#)mfs_vfsops.c 8.3 (Berkeley) 01/12/94 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 ffs_root, 47 ufs_quotactl, 48 mfs_statfs, 49 ffs_sync, 50 ffs_vget, 51 ffs_fhtovp, 52 ffs_vptofh, 53 mfs_init, 54 }; 55 56 /* 57 * Called by main() when mfs is going to be mounted as root. 58 * 59 * Name is updated by mount(8) after booting. 60 */ 61 #define ROOTNAME "mfs_root" 62 63 mfs_mountroot() 64 { 65 extern struct vnode *rootvp; 66 register struct fs *fs; 67 register struct mount *mp; 68 struct proc *p = curproc; /* XXX */ 69 struct ufsmount *ump; 70 struct mfsnode *mfsp; 71 u_int size; 72 int error; 73 74 /* 75 * Get vnodes for swapdev and rootdev. 76 */ 77 if (bdevvp(swapdev, &swapdev_vp) || bdevvp(rootdev, &rootvp)) 78 panic("mfs_mountroot: can't setup bdevvp's"); 79 80 mp = malloc((u_long)sizeof(struct mount), M_MOUNT, M_WAITOK); 81 bzero((char *)mp, (u_long)sizeof(struct mount)); 82 mp->mnt_op = &mfs_vfsops; 83 mp->mnt_flag = MNT_RDONLY; 84 mfsp = malloc(sizeof *mfsp, M_MFSNODE, M_WAITOK); 85 rootvp->v_data = mfsp; 86 rootvp->v_op = mfs_vnodeop_p; 87 rootvp->v_tag = VT_MFS; 88 mfsp->mfs_baseoff = mfs_rootbase; 89 mfsp->mfs_size = mfs_rootsize; 90 mfsp->mfs_vnode = rootvp; 91 mfsp->mfs_pid = p->p_pid; 92 mfsp->mfs_buflist = (struct buf *)0; 93 if (error = ffs_mountfs(rootvp, mp, p)) { 94 free(mp, M_MOUNT); 95 free(mfsp, M_MFSNODE); 96 return (error); 97 } 98 if (error = vfs_lock(mp)) { 99 (void)ffs_unmount(mp, 0, p); 100 free(mp, M_MOUNT); 101 free(mfsp, M_MFSNODE); 102 return (error); 103 } 104 TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list); 105 mp->mnt_flag |= MNT_ROOTFS; 106 mp->mnt_vnodecovered = NULLVP; 107 ump = VFSTOUFS(mp); 108 fs = ump->um_fs; 109 bzero(fs->fs_fsmnt, sizeof(fs->fs_fsmnt)); 110 fs->fs_fsmnt[0] = '/'; 111 bcopy((caddr_t)fs->fs_fsmnt, (caddr_t)mp->mnt_stat.f_mntonname, 112 MNAMELEN); 113 (void) copystr(ROOTNAME, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 114 &size); 115 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 116 (void)ffs_statfs(mp, &mp->mnt_stat, p); 117 vfs_unlock(mp); 118 inittodr((time_t)0); 119 return (0); 120 } 121 122 /* 123 * This is called early in boot to set the base address and size 124 * of the mini-root. 125 */ 126 mfs_initminiroot(base) 127 caddr_t base; 128 { 129 struct fs *fs = (struct fs *)(base + SBOFF); 130 extern int (*mountroot)(); 131 132 /* check for valid super block */ 133 if (fs->fs_magic != FS_MAGIC || fs->fs_bsize > MAXBSIZE || 134 fs->fs_bsize < sizeof(struct fs)) 135 return (0); 136 mountroot = mfs_mountroot; 137 mfs_rootbase = base; 138 mfs_rootsize = fs->fs_fsize * fs->fs_size; 139 rootdev = makedev(255, mfs_minor++); 140 return (mfs_rootsize); 141 } 142 143 /* 144 * VFS Operations. 145 * 146 * mount system call 147 */ 148 /* ARGSUSED */ 149 int 150 mfs_mount(mp, path, data, ndp, p) 151 register struct mount *mp; 152 char *path; 153 caddr_t data; 154 struct nameidata *ndp; 155 struct proc *p; 156 { 157 struct vnode *devvp; 158 struct mfs_args args; 159 struct ufsmount *ump; 160 register struct fs *fs; 161 register struct mfsnode *mfsp; 162 u_int size; 163 int flags, error; 164 165 if (error = copyin(data, (caddr_t)&args, sizeof (struct mfs_args))) 166 return (error); 167 168 /* 169 * If updating, check whether changing from read-only to 170 * read/write; if there is no device name, that's all we do. 171 */ 172 if (mp->mnt_flag & MNT_UPDATE) { 173 ump = VFSTOUFS(mp); 174 fs = ump->um_fs; 175 if (fs->fs_ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) { 176 flags = WRITECLOSE; 177 if (mp->mnt_flag & MNT_FORCE) 178 flags |= FORCECLOSE; 179 if (vfs_busy(mp)) 180 return (EBUSY); 181 error = ffs_flushfiles(mp, flags, p); 182 vfs_unbusy(mp); 183 if (error) 184 return (error); 185 } 186 if (fs->fs_ronly && (mp->mnt_flag & MNT_WANTRDWR)) 187 fs->fs_ronly = 0; 188 #ifdef EXPORTMFS 189 if (args.fspec == 0) 190 return (vfs_export(mp, &ump->um_export, &args.export)); 191 #endif 192 return (0); 193 } 194 error = getnewvnode(VT_MFS, (struct mount *)0, mfs_vnodeop_p, &devvp); 195 if (error) 196 return (error); 197 devvp->v_type = VBLK; 198 if (checkalias(devvp, makedev(255, mfs_minor++), (struct mount *)0)) 199 panic("mfs_mount: dup dev"); 200 mfsp = (struct mfsnode *)malloc(sizeof *mfsp, M_MFSNODE, M_WAITOK); 201 devvp->v_data = mfsp; 202 mfsp->mfs_baseoff = args.base; 203 mfsp->mfs_size = args.size; 204 mfsp->mfs_vnode = devvp; 205 mfsp->mfs_pid = p->p_pid; 206 mfsp->mfs_buflist = (struct buf *)0; 207 if (error = ffs_mountfs(devvp, mp, p)) { 208 mfsp->mfs_buflist = (struct buf *)-1; 209 vrele(devvp); 210 return (error); 211 } 212 ump = VFSTOUFS(mp); 213 fs = ump->um_fs; 214 (void) copyinstr(path, fs->fs_fsmnt, sizeof(fs->fs_fsmnt) - 1, &size); 215 bzero(fs->fs_fsmnt + size, sizeof(fs->fs_fsmnt) - size); 216 bcopy((caddr_t)fs->fs_fsmnt, (caddr_t)mp->mnt_stat.f_mntonname, 217 MNAMELEN); 218 (void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 219 &size); 220 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 221 (void) mfs_statfs(mp, &mp->mnt_stat, p); 222 return (0); 223 } 224 225 int mfs_pri = PWAIT | PCATCH; /* XXX prob. temp */ 226 227 /* 228 * Used to grab the process and keep it in the kernel to service 229 * memory filesystem I/O requests. 230 * 231 * Loop servicing I/O requests. 232 * Copy the requested data into or out of the memory filesystem 233 * address space. 234 */ 235 /* ARGSUSED */ 236 int 237 mfs_start(mp, flags, p) 238 struct mount *mp; 239 int flags; 240 struct proc *p; 241 { 242 register struct vnode *vp = VFSTOUFS(mp)->um_devvp; 243 register struct mfsnode *mfsp = VTOMFS(vp); 244 register struct buf *bp; 245 register caddr_t base; 246 int error = 0; 247 248 base = mfsp->mfs_baseoff; 249 while (mfsp->mfs_buflist != (struct buf *)(-1)) { 250 while (bp = mfsp->mfs_buflist) { 251 mfsp->mfs_buflist = bp->b_actf; 252 mfs_doio(bp, base); 253 wakeup((caddr_t)bp); 254 } 255 /* 256 * If a non-ignored signal is received, try to unmount. 257 * If that fails, clear the signal (it has been "processed"), 258 * otherwise we will loop here, as tsleep will always return 259 * EINTR/ERESTART. 260 */ 261 if (error = tsleep((caddr_t)vp, mfs_pri, "mfsidl", 0)) 262 if (dounmount(mp, 0, p) != 0) 263 CLRSIG(p, CURSIG(p)); 264 } 265 return (error); 266 } 267 268 /* 269 * Get file system statistics. 270 */ 271 mfs_statfs(mp, sbp, p) 272 struct mount *mp; 273 struct statfs *sbp; 274 struct proc *p; 275 { 276 int error; 277 278 error = ffs_statfs(mp, sbp, p); 279 sbp->f_type = MOUNT_MFS; 280 return (error); 281 } 282