1 /* $OpenBSD: fuse_vfsops.c,v 1.19 2016/03/17 18:52:31 bluhm Exp $ */ 2 /* 3 * Copyright (c) 2012-2013 Sylvestre Gallon <ccna.syl@gmail.com> 4 * 5 * Permission to use, copy, modify, and distribute this software for any 6 * purpose with or without fee is hereby granted, provided that the above 7 * copyright notice and this permission notice appear in all copies. 8 * 9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16 */ 17 18 #include <sys/param.h> 19 #include <sys/systm.h> 20 #include <sys/file.h> 21 #include <sys/filedesc.h> 22 #include <sys/malloc.h> 23 #include <sys/mount.h> 24 #include <sys/pool.h> 25 #include <sys/proc.h> 26 #include <sys/specdev.h> 27 #include <sys/statvfs.h> 28 #include <sys/sysctl.h> 29 #include <sys/vnode.h> 30 #include <sys/fusebuf.h> 31 32 #include "fusefs_node.h" 33 #include "fusefs.h" 34 35 int fusefs_mount(struct mount *, const char *, void *, struct nameidata *, 36 struct proc *); 37 int fusefs_start(struct mount *, int, struct proc *); 38 int fusefs_unmount(struct mount *, int, struct proc *); 39 int fusefs_root(struct mount *, struct vnode **); 40 int fusefs_quotactl(struct mount *, int, uid_t, caddr_t, struct proc *); 41 int fusefs_statfs(struct mount *, struct statfs *, struct proc *); 42 int fusefs_sync(struct mount *, int, struct ucred *, struct proc *); 43 int fusefs_vget(struct mount *, ino_t, struct vnode **); 44 int fusefs_fhtovp(struct mount *, struct fid *, struct vnode **); 45 int fusefs_vptofh(struct vnode *, struct fid *); 46 int fusefs_init(struct vfsconf *); 47 int fusefs_sysctl(int *, u_int, void *, size_t *, void *, size_t, 48 struct proc *); 49 int fusefs_checkexp(struct mount *, struct mbuf *, int *, 50 struct ucred **); 51 52 const struct vfsops fusefs_vfsops = { 53 fusefs_mount, 54 fusefs_start, 55 fusefs_unmount, 56 fusefs_root, 57 fusefs_quotactl, 58 fusefs_statfs, 59 fusefs_sync, 60 fusefs_vget, 61 fusefs_fhtovp, 62 fusefs_vptofh, 63 fusefs_init, 64 fusefs_sysctl, 65 fusefs_checkexp 66 }; 67 68 struct pool fusefs_fbuf_pool; 69 70 int 71 fusefs_mount(struct mount *mp, const char *path, void *data, 72 struct nameidata *ndp, struct proc *p) 73 { 74 struct fusefs_mnt *fmp; 75 struct fusebuf *fbuf; 76 struct fusefs_args args; 77 struct vnode *vp; 78 struct file *fp; 79 int error; 80 81 if (mp->mnt_flag & MNT_UPDATE) 82 return (EOPNOTSUPP); 83 84 error = copyin(data, &args, sizeof(struct fusefs_args)); 85 if (error) 86 return (error); 87 88 if ((fp = fd_getfile(p->p_fd, args.fd)) == NULL) 89 return (EBADF); 90 91 if (fp->f_type != DTYPE_VNODE) 92 return (EINVAL); 93 94 vp = fp->f_data; 95 if (vp->v_type != VCHR) 96 return (EBADF); 97 98 fmp = malloc(sizeof(*fmp), M_FUSEFS, M_WAITOK | M_ZERO); 99 fmp->mp = mp; 100 fmp->sess_init = 0; 101 fmp->dev = vp->v_rdev; 102 if (args.max_read > 0) 103 fmp->max_read = MIN(args.max_read, FUSEBUFMAXSIZE); 104 else 105 fmp->max_read = FUSEBUFMAXSIZE; 106 107 mp->mnt_data = fmp; 108 mp->mnt_flag |= MNT_LOCAL; 109 vfs_getnewfsid(mp); 110 111 bzero(mp->mnt_stat.f_mntonname, MNAMELEN); 112 strlcpy(mp->mnt_stat.f_mntonname, path, MNAMELEN); 113 bzero(mp->mnt_stat.f_mntfromname, MNAMELEN); 114 bcopy("fusefs", mp->mnt_stat.f_mntfromname, sizeof("fusefs")); 115 116 fuse_device_set_fmp(fmp, 1); 117 fbuf = fb_setup(0, 0, FBT_INIT, p); 118 119 /* cannot tsleep on mount */ 120 fuse_device_queue_fbuf(fmp->dev, fbuf); 121 122 return (0); 123 } 124 125 int 126 fusefs_start(struct mount *mp, int flags, struct proc *p) 127 { 128 return (0); 129 } 130 131 int 132 fusefs_unmount(struct mount *mp, int mntflags, struct proc *p) 133 { 134 struct fusefs_mnt *fmp; 135 struct fusebuf *fbuf; 136 extern int doforce; 137 int flags = 0; 138 int error; 139 140 fmp = VFSTOFUSEFS(mp); 141 142 if (mntflags & MNT_FORCE) { 143 /* fusefs can never be rootfs so don't check for it */ 144 if (!doforce) 145 return (EINVAL); 146 147 flags |= FORCECLOSE; 148 } 149 150 if ((error = vflush(mp, NULLVP, flags))) 151 return (error); 152 153 if (fmp->sess_init) { 154 fmp->sess_init = 0; 155 fbuf = fb_setup(0, 0, FBT_DESTROY, p); 156 157 error = fb_queue(fmp->dev, fbuf); 158 159 if (error) 160 printf("fusefs: error %d on destroy\n", error); 161 162 fb_delete(fbuf); 163 } 164 165 fuse_device_cleanup(fmp->dev, NULL); 166 fuse_device_set_fmp(fmp, 0); 167 free(fmp, M_FUSEFS, 0); 168 mp->mnt_data = NULL; 169 170 return (error); 171 } 172 173 int 174 fusefs_root(struct mount *mp, struct vnode **vpp) 175 { 176 struct vnode *nvp; 177 struct fusefs_node *ip; 178 int error; 179 180 if ((error = VFS_VGET(mp, (ino_t)FUSE_ROOTINO, &nvp)) != 0) 181 return (error); 182 183 ip = VTOI(nvp); 184 nvp->v_type = VDIR; 185 ip->vtype = VDIR; 186 187 *vpp = nvp; 188 return (0); 189 } 190 191 int 192 fusefs_quotactl(struct mount *mp, int cmds, uid_t uid, caddr_t arg, 193 struct proc *p) 194 { 195 return (EOPNOTSUPP); 196 } 197 198 int 199 fusefs_statfs(struct mount *mp, struct statfs *sbp, struct proc *p) 200 { 201 struct fusefs_mnt *fmp; 202 struct fusebuf *fbuf; 203 int error; 204 205 fmp = VFSTOFUSEFS(mp); 206 207 if (fmp->sess_init) { 208 fbuf = fb_setup(0, FUSE_ROOT_ID, FBT_STATFS, p); 209 210 error = fb_queue(fmp->dev, fbuf); 211 212 if (error) { 213 fb_delete(fbuf); 214 return (error); 215 } 216 217 sbp->f_bavail = fbuf->fb_stat.f_bavail; 218 sbp->f_bfree = fbuf->fb_stat.f_bfree; 219 sbp->f_blocks = fbuf->fb_stat.f_blocks; 220 sbp->f_files = fbuf->fb_stat.f_files; 221 sbp->f_ffree = fbuf->fb_stat.f_ffree; 222 sbp->f_bsize = fbuf->fb_stat.f_frsize; 223 sbp->f_namemax = fbuf->fb_stat.f_namemax; 224 fb_delete(fbuf); 225 } else { 226 sbp->f_bavail = 0; 227 sbp->f_bfree = 0; 228 sbp->f_blocks = 0; 229 sbp->f_ffree = 0; 230 sbp->f_files = 0; 231 sbp->f_bsize = 0; 232 sbp->f_namemax = 0; 233 } 234 235 return (0); 236 } 237 238 int 239 fusefs_sync(struct mount *mp, int waitfor, struct ucred *cred, 240 struct proc *p) 241 { 242 return (0); 243 } 244 245 int 246 fusefs_vget(struct mount *mp, ino_t ino, struct vnode **vpp) 247 { 248 struct fusefs_mnt *fmp; 249 struct fusefs_node *ip; 250 struct vnode *nvp; 251 int i; 252 int error; 253 retry: 254 fmp = VFSTOFUSEFS(mp); 255 /* 256 * check if vnode is in hash. 257 */ 258 if ((*vpp = ufs_ihashget(fmp->dev, ino)) != NULLVP) 259 return (0); 260 261 /* 262 * if not create it 263 */ 264 if ((error = getnewvnode(VT_FUSEFS, mp, &fusefs_vops, &nvp)) != 0) { 265 printf("fusefs: getnewvnode error\n"); 266 *vpp = NULLVP; 267 return (error); 268 } 269 270 ip = malloc(sizeof(*ip), M_FUSEFS, M_WAITOK | M_ZERO); 271 lockinit(&ip->ufs_ino.i_lock, PINOD, "fuseinode", 0, 0); 272 nvp->v_data = ip; 273 ip->ufs_ino.i_vnode = nvp; 274 ip->ufs_ino.i_dev = fmp->dev; 275 ip->ufs_ino.i_number = ino; 276 ip->parent = 0; 277 278 for (i = 0; i < FUFH_MAXTYPE; i++) 279 ip->fufh[i].fh_type = FUFH_INVALID; 280 281 error = ufs_ihashins(&ip->ufs_ino); 282 if (error) { 283 vrele(nvp); 284 285 if (error == EEXIST) 286 goto retry; 287 288 return (error); 289 } 290 291 ip->ufs_ino.i_ump = (struct ufsmount *)fmp; 292 293 if (ino == FUSE_ROOTINO) 294 nvp->v_flag |= VROOT; 295 296 *vpp = nvp; 297 298 return (0); 299 } 300 301 int 302 fusefs_fhtovp(struct mount *mp, struct fid *fhp, struct vnode **vpp) 303 { 304 struct ufid *ufhp; 305 306 ufhp = (struct ufid *)fhp; 307 if (ufhp->ufid_len != sizeof(struct ufid) || 308 ufhp->ufid_ino < FUSE_ROOTINO) 309 return (ESTALE); 310 311 return (VFS_VGET(mp, ufhp->ufid_ino, vpp)); 312 } 313 314 int 315 fusefs_vptofh(struct vnode *vp, struct fid *fhp) 316 { 317 struct fusefs_node *ip; 318 struct ufid *ufhp; 319 320 ip = VTOI(vp); 321 ufhp = (struct ufid *)fhp; 322 ufhp->ufid_len = sizeof(struct ufid); 323 ufhp->ufid_ino = ip->ufs_ino.i_number; 324 325 return (0); 326 } 327 328 int 329 fusefs_init(struct vfsconf *vfc) 330 { 331 pool_init(&fusefs_fbuf_pool, sizeof(struct fusebuf), 0, 0, PR_WAITOK, 332 "fmsg", NULL); 333 334 return (0); 335 } 336 337 int 338 fusefs_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp, 339 void *newp, size_t newlen, struct proc *p) 340 { 341 extern int stat_fbufs_in, stat_fbufs_wait, stat_opened_fusedev; 342 343 /* all sysctl names at this level are terminal */ 344 if (namelen != 1) 345 return (ENOTDIR); /* overloaded */ 346 347 switch (name[0]) { 348 case FUSEFS_OPENDEVS: 349 return (sysctl_rdint(oldp, oldlenp, newp, 350 stat_opened_fusedev)); 351 case FUSEFS_INFBUFS: 352 return (sysctl_rdint(oldp, oldlenp, newp, stat_fbufs_in)); 353 case FUSEFS_WAITFBUFS: 354 return (sysctl_rdint(oldp, oldlenp, newp, stat_fbufs_wait)); 355 case FUSEFS_POOL_NBPAGES: 356 return (sysctl_rdint(oldp, oldlenp, newp, 357 fusefs_fbuf_pool.pr_npages)); 358 default: 359 return (EOPNOTSUPP); 360 } 361 } 362 363 int 364 fusefs_checkexp(struct mount *mp, struct mbuf *nam, int *extflagsp, 365 struct ucred **credanonp) 366 { 367 return (EOPNOTSUPP); 368 } 369