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 8.1 (Berkeley) 06/11/93 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 mp->mnt_op = &mfs_vfsops; 82 mp->mnt_flag = MNT_RDONLY; 83 mp->mnt_mounth = NULLVP; 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 rootfs = mp; 105 mp->mnt_next = mp; 106 mp->mnt_prev = mp; 107 mp->mnt_vnodecovered = NULLVP; 108 ump = VFSTOUFS(mp); 109 fs = ump->um_fs; 110 bzero(fs->fs_fsmnt, sizeof(fs->fs_fsmnt)); 111 fs->fs_fsmnt[0] = '/'; 112 bcopy((caddr_t)fs->fs_fsmnt, (caddr_t)mp->mnt_stat.f_mntonname, 113 MNAMELEN); 114 (void) copystr(ROOTNAME, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 115 &size); 116 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 117 (void)ffs_statfs(mp, &mp->mnt_stat, p); 118 vfs_unlock(mp); 119 inittodr((time_t)0); 120 return (0); 121 } 122 123 /* 124 * This is called early in boot to set the base address and size 125 * of the mini-root. 126 */ 127 mfs_initminiroot(base) 128 caddr_t base; 129 { 130 struct fs *fs = (struct fs *)(base + SBOFF); 131 extern int (*mountroot)(); 132 133 /* check for valid super block */ 134 if (fs->fs_magic != FS_MAGIC || fs->fs_bsize > MAXBSIZE || 135 fs->fs_bsize < sizeof(struct fs)) 136 return (0); 137 mountroot = mfs_mountroot; 138 mfs_rootbase = base; 139 mfs_rootsize = fs->fs_fsize * fs->fs_size; 140 rootdev = makedev(255, mfs_minor++); 141 return (mfs_rootsize); 142 } 143 144 /* 145 * VFS Operations. 146 * 147 * mount system call 148 */ 149 /* ARGSUSED */ 150 int 151 mfs_mount(mp, path, data, ndp, p) 152 register struct mount *mp; 153 char *path; 154 caddr_t data; 155 struct nameidata *ndp; 156 struct proc *p; 157 { 158 struct vnode *devvp; 159 struct mfs_args args; 160 struct ufsmount *ump; 161 register struct fs *fs; 162 register struct mfsnode *mfsp; 163 u_int size; 164 int flags, error; 165 166 /* 167 * If updating, check whether changing from read-only to 168 * read/write; if there is no device name, that's all we do. 169 */ 170 if (mp->mnt_flag & MNT_UPDATE) { 171 ump = VFSTOUFS(mp); 172 fs = ump->um_fs; 173 if (fs->fs_ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) { 174 flags = WRITECLOSE; 175 if (mp->mnt_flag & MNT_FORCE) 176 flags |= FORCECLOSE; 177 if (vfs_busy(mp)) 178 return (EBUSY); 179 error = ffs_flushfiles(mp, flags, p); 180 vfs_unbusy(mp); 181 if (error) 182 return (error); 183 } 184 if (fs->fs_ronly && (mp->mnt_flag & MNT_WANTRDWR)) 185 fs->fs_ronly = 0; 186 return (0); 187 } 188 if (error = copyin(data, (caddr_t)&args, sizeof (struct mfs_args))) 189 return (error); 190 error = getnewvnode(VT_MFS, (struct mount *)0, mfs_vnodeop_p, &devvp); 191 if (error) 192 return (error); 193 devvp->v_type = VBLK; 194 if (checkalias(devvp, makedev(255, mfs_minor++), (struct mount *)0)) 195 panic("mfs_mount: dup dev"); 196 mfsp = (struct mfsnode *)malloc(sizeof *mfsp, M_MFSNODE, M_WAITOK); 197 devvp->v_data = mfsp; 198 mfsp->mfs_baseoff = args.base; 199 mfsp->mfs_size = args.size; 200 mfsp->mfs_vnode = devvp; 201 mfsp->mfs_pid = p->p_pid; 202 mfsp->mfs_buflist = (struct buf *)0; 203 if (error = ffs_mountfs(devvp, mp, p)) { 204 mfsp->mfs_buflist = (struct buf *)-1; 205 vrele(devvp); 206 return (error); 207 } 208 ump = VFSTOUFS(mp); 209 fs = ump->um_fs; 210 (void) copyinstr(path, fs->fs_fsmnt, sizeof(fs->fs_fsmnt) - 1, &size); 211 bzero(fs->fs_fsmnt + size, sizeof(fs->fs_fsmnt) - size); 212 bcopy((caddr_t)fs->fs_fsmnt, (caddr_t)mp->mnt_stat.f_mntonname, 213 MNAMELEN); 214 (void) copyinstr(args.name, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 215 &size); 216 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 217 (void) mfs_statfs(mp, &mp->mnt_stat, p); 218 return (0); 219 } 220 221 int mfs_pri = PWAIT | PCATCH; /* XXX prob. temp */ 222 223 /* 224 * Used to grab the process and keep it in the kernel to service 225 * memory filesystem I/O requests. 226 * 227 * Loop servicing I/O requests. 228 * Copy the requested data into or out of the memory filesystem 229 * address space. 230 */ 231 /* ARGSUSED */ 232 int 233 mfs_start(mp, flags, p) 234 struct mount *mp; 235 int flags; 236 struct proc *p; 237 { 238 register struct vnode *vp = VFSTOUFS(mp)->um_devvp; 239 register struct mfsnode *mfsp = VTOMFS(vp); 240 register struct buf *bp; 241 register caddr_t base; 242 int error = 0; 243 244 base = mfsp->mfs_baseoff; 245 while (mfsp->mfs_buflist != (struct buf *)(-1)) { 246 while (bp = mfsp->mfs_buflist) { 247 mfsp->mfs_buflist = bp->b_actf; 248 mfs_doio(bp, base); 249 wakeup((caddr_t)bp); 250 } 251 /* 252 * If a non-ignored signal is received, try to unmount. 253 * If that fails, clear the signal (it has been "processed"), 254 * otherwise we will loop here, as tsleep will always return 255 * EINTR/ERESTART. 256 */ 257 if (error = tsleep((caddr_t)vp, mfs_pri, "mfsidl", 0)) 258 if (dounmount(mp, 0, p) != 0) 259 CLRSIG(p, CURSIG(p)); 260 } 261 return (error); 262 } 263 264 /* 265 * Get file system statistics. 266 */ 267 mfs_statfs(mp, sbp, p) 268 struct mount *mp; 269 struct statfs *sbp; 270 struct proc *p; 271 { 272 int error; 273 274 error = ffs_statfs(mp, sbp, p); 275 sbp->f_type = MOUNT_MFS; 276 return (error); 277 } 278