sys/vfs/smbfs/smbfs_vfsops.c

   1 /*
   2  * Copyright (c) 2000-2001, Boris Popov
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *    This product includes software developed by Boris Popov.
  16  * 4. Neither the name of the author nor the names of any co-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 AUTHOR 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 AUTHOR 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  * $FreeBSD: src/sys/fs/smbfs/smbfs_vfsops.c,v 1.2.2.5 2003/01/17 08:20:26 tjr Exp $
  33  * $DragonFly: src/sys/vfs/smbfs/smbfs_vfsops.c,v 1.33 2007/05/06 19:23:35 dillon Exp $
  34  */
  35 #include "opt_netsmb.h"
  36 #ifndef NETSMB
  37 #error "SMBFS requires option NETSMB"
  38 #endif
  39
  40 #include <sys/param.h>
  41 #include <sys/systm.h>
  42 #include <sys/proc.h>
  43 #include <sys/kernel.h>
  44 #include <sys/sysctl.h>
  45 #include <sys/vnode.h>
  46 #include <sys/mount.h>
  47 #include <sys/stat.h>
  48 #include <sys/malloc.h>
  49 #include <sys/module.h>
  50
  51
  52 #include <netproto/smb/smb.h>
  53 #include <netproto/smb/smb_conn.h>
  54 #include <netproto/smb/smb_subr.h>
  55 #include <netproto/smb/smb_dev.h>
  56
  57 #include "smbfs.h"
  58 #include "smbfs_node.h"
  59 #include "smbfs_subr.h"
  60
  61 #include <sys/buf.h>
  62
  63 extern struct vop_ops smbfs_vnode_vops;
  64
  65 int smbfs_debuglevel = 0;
  66
  67 static int smbfs_version = SMBFS_VERSION;
  68
  69 #ifdef SMBFS_USEZONE
  70 #include <vm/vm.h>
  71 #include <vm/vm_extern.h>
  72 #include <vm/vm_zone.h>
  73
  74 vm_zone_t smbfsmount_zone;
  75 #endif
  76
  77 SYSCTL_NODE(_vfs, OID_AUTO, smbfs, CTLFLAG_RW, 0, "SMB/CIFS file system");
  78 SYSCTL_INT(_vfs_smbfs, OID_AUTO, version, CTLFLAG_RD, &smbfs_version, 0, "");
  79 SYSCTL_INT(_vfs_smbfs, OID_AUTO, debuglevel, CTLFLAG_RW, &smbfs_debuglevel, 0, "");
  80
  81 static MALLOC_DEFINE(M_SMBFSHASH, "SMBFS hash", "SMBFS hash table");
  82
  83
  84 static int smbfs_mount(struct mount *, char *, caddr_t, struct ucred *);
  85 static int smbfs_root(struct mount *, struct vnode **);
  86 static int smbfs_statfs(struct mount *, struct statfs *, struct ucred *);
  87 static int smbfs_sync(struct mount *, int);
  88 static int smbfs_unmount(struct mount *, int);
  89 static int smbfs_init(struct vfsconf *vfsp);
  90 static int smbfs_uninit(struct vfsconf *vfsp);
  91
  92 #if defined(__FreeBSD__) && __FreeBSD_version < 400009
  93 static int smbfs_vget(struct mount *mp, ino_t ino, struct vnode **vpp);
  94 static int smbfs_fhtovp(struct mount *, struct fid *,
  95                         struct sockaddr *, struct vnode **, int *,
  96                         struct ucred **);
  97 static int smbfs_vptofh(struct vnode *, struct fid *);
  98 #endif
  99
 100 static struct vfsops smbfs_vfsops = {
 101         .vfs_mount =            smbfs_mount,
 102         .vfs_unmount =          smbfs_unmount,
 103         .vfs_root =             smbfs_root,
 104         .vfs_statfs =           smbfs_statfs,
 105         .vfs_sync =             smbfs_sync,
 106         .vfs_init =             smbfs_init,
 107         .vfs_uninit =           smbfs_uninit
 108 };
 109
 110
 111 VFS_SET(smbfs_vfsops, smbfs, VFCF_NETWORK);
 112
 113 MODULE_DEPEND(smbfs, netsmb, NSMB_VERSION, NSMB_VERSION, NSMB_VERSION);
 114 MODULE_DEPEND(smbfs, libiconv, 1, 1, 1);
 115 MODULE_DEPEND(smbfs, libmchain, 1, 1, 1);
 116
 117 int smbfs_pbuf_freecnt = -1;    /* start out unlimited */
 118
 119 static int
 120 smbfs_mount(struct mount *mp, char *path, caddr_t data, struct ucred *cred)
 121 {
 122         struct smbfs_args args;           /* will hold data from mount request */
 123         struct smbmount *smp = NULL;
 124         struct smb_vc *vcp;
 125         struct smb_share *ssp = NULL;
 126         struct vnode *vp;
 127         struct smb_cred scred;
 128         int error;
 129         char *pc, *pe;
 130
 131         if (data == NULL) {
 132                 kprintf("missing data argument\n");
 133                 return EINVAL;
 134         }
 135         if (mp->mnt_flag & MNT_UPDATE) {
 136                 kprintf("MNT_UPDATE not implemented");
 137                 return EOPNOTSUPP;
 138         }
 139         error = copyin(data, (caddr_t)&args, sizeof(struct smbfs_args));
 140         if (error)
 141                 return error;
 142         if (args.version != SMBFS_VERSION) {
 143                 kprintf("mount version mismatch: kernel=%d, mount=%d\n",
 144                     SMBFS_VERSION, args.version);
 145                 return EINVAL;
 146         }
 147         smb_makescred(&scred, curthread, cred);
 148         error = smb_dev2share(args.dev, SMBM_EXEC, &scred, &ssp);
 149         if (error) {
 150                 kprintf("invalid device handle %d (%d)\n", args.dev, error);
 151                 return error;
 152         }
 153         vcp = SSTOVC(ssp);
 154         smb_share_unlock(ssp, 0);
 155         mp->mnt_stat.f_iosize = SSTOVC(ssp)->vc_txmax;
 156
 157 #ifdef SMBFS_USEZONE
 158         smp = zalloc(smbfsmount_zone);
 159 #else
 160         MALLOC(smp, struct smbmount*, sizeof(*smp), M_SMBFSDATA, M_WAITOK|M_USE_RESERVE);
 161 #endif
 162         if (smp == NULL) {
 163                 kprintf("could not alloc smbmount\n");
 164                 error = ENOMEM;
 165                 goto bad;
 166         }
 167         bzero(smp, sizeof(*smp));
 168         mp->mnt_data = (qaddr_t)smp;
 169         smp->sm_cred = crhold(cred);
 170         smp->sm_hash = hashinit(desiredvnodes, M_SMBFSHASH, &smp->sm_hashlen);
 171         if (smp->sm_hash == NULL)
 172                 goto bad;
 173         lockinit(&smp->sm_hashlock, "smbfsh", 0, 0);
 174         smp->sm_share = ssp;
 175         smp->sm_root = NULL;
 176         smp->sm_args = args;
 177         smp->sm_caseopt = args.caseopt;
 178         smp->sm_args.file_mode = (smp->sm_args.file_mode &
 179                             (S_IRWXU|S_IRWXG|S_IRWXO)) | S_IFREG;
 180         smp->sm_args.dir_mode  = (smp->sm_args.dir_mode &
 181                             (S_IRWXU|S_IRWXG|S_IRWXO)) | S_IFDIR;
 182
 183 /*      simple_lock_init(&smp->sm_npslock);*/
 184         pc = mp->mnt_stat.f_mntfromname;
 185         pe = pc + sizeof(mp->mnt_stat.f_mntfromname);
 186         bzero(pc, MNAMELEN);
 187         *pc++ = '/';
 188         *pc++ = '/';
 189         pc=index(strncpy(pc, vcp->vc_username, pe - pc - 2), 0);
 190         if (pc < pe-1) {
 191                 *(pc++) = '@';
 192                 pc = index(strncpy(pc, vcp->vc_srvname, pe - pc - 2), 0);
 193                 if (pc < pe - 1) {
 194                         *(pc++) = '/';
 195                         strncpy(pc, ssp->ss_name, pe - pc - 2);
 196                 }
 197         }
 198         /* protect against invalid mount points */
 199         smp->sm_args.mount_point[sizeof(smp->sm_args.mount_point) - 1] = '\0';
 200         vfs_getnewfsid(mp);
 201
 202         vfs_add_vnodeops(mp, &smbfs_vnode_vops, &mp->mnt_vn_norm_ops);
 203
 204         error = smbfs_root(mp, &vp);
 205         if (error)
 206                 goto bad;
 207         vn_unlock(vp);
 208         SMBVDEBUG("root.v_sysrefs = %d\n", vp->v_sysref.refcnt);
 209
 210 #ifdef DIAGNOSTICS
 211         SMBERROR("mp=%p\n", mp);
 212 #endif
 213         return error;
 214 bad:
 215         if (smp) {
 216                 if (smp->sm_cred)
 217                         crfree(smp->sm_cred);
 218                 if (smp->sm_hash)
 219                         kfree(smp->sm_hash, M_SMBFSHASH);
 220                 lockdestroy(&smp->sm_hashlock);
 221 #ifdef SMBFS_USEZONE
 222                 zfree(smbfsmount_zone, smp);
 223 #else
 224                 kfree(smp, M_SMBFSDATA);
 225 #endif
 226         }
 227         if (ssp)
 228                 smb_share_put(ssp, &scred);
 229         return error;
 230 }
 231
 232 /* Unmount the filesystem described by mp. */
 233 static int
 234 smbfs_unmount(struct mount *mp, int mntflags)
 235 {
 236         struct smbmount *smp = VFSTOSMBFS(mp);
 237         struct smb_cred scred;
 238         int error, flags;
 239
 240         SMBVDEBUG("smbfs_unmount: flags=%04x\n", mntflags);
 241         flags = 0;
 242         if (mntflags & MNT_FORCE)
 243                 flags |= FORCECLOSE;
 244         /*
 245          * Keep trying to flush the vnode list for the mount while
 246          * some are still busy and we are making progress towards
 247          * making them not busy. This is needed because smbfs vnodes
 248          * reference their parent directory but may appear after their
 249          * parent in the list; one pass over the vnode list is not
 250          * sufficient in this case.
 251          */
 252         do {
 253                 smp->sm_didrele = 0;
 254                 /* There is 1 extra root vnode reference from smbfs_mount(). */
 255                 error = vflush(mp, 1, flags);
 256         } while (error == EBUSY && smp->sm_didrele != 0);
 257         if (error)
 258                 return error;
 259         smb_makescred(&scred, curthread, smp->sm_cred);
 260         smb_share_put(smp->sm_share, &scred);
 261         mp->mnt_data = (qaddr_t)0;
 262
 263         if (smp->sm_cred)
 264                 crfree(smp->sm_cred);
 265         if (smp->sm_hash)
 266                 kfree(smp->sm_hash, M_SMBFSHASH);
 267         lockdestroy(&smp->sm_hashlock);
 268 #ifdef SMBFS_USEZONE
 269         zfree(smbfsmount_zone, smp);
 270 #else
 271         kfree(smp, M_SMBFSDATA);
 272 #endif
 273         mp->mnt_flag &= ~MNT_LOCAL;
 274         return error;
 275 }
 276
 277 /*
 278  * Return locked root vnode of a filesystem
 279  */
 280 static int
 281 smbfs_root(struct mount *mp, struct vnode **vpp)
 282 {
 283         struct thread *td = curthread;  /* XXX */
 284         struct smbmount *smp = VFSTOSMBFS(mp);
 285         struct vnode *vp;
 286         struct smbnode *np;
 287         struct smbfattr fattr;
 288         struct ucred *cred;
 289         struct smb_cred scred;
 290         int error;
 291
 292         if (smp == NULL) {
 293                 SMBERROR("smp == NULL (bug in umount)\n");
 294                 return EINVAL;
 295         }
 296         if (smp->sm_root) {
 297                 *vpp = SMBTOV(smp->sm_root);
 298                 return vget(*vpp, LK_EXCLUSIVE | LK_RETRY);
 299         }
 300         if (td->td_proc)
 301                 cred = td->td_proc->p_ucred;
 302         else
 303                 cred = proc0.p_ucred;
 304
 305         smb_makescred(&scred, td, cred);
 306         error = smbfs_smb_lookup(NULL, NULL, 0, &fattr, &scred);
 307         if (error)
 308                 return error;
 309         error = smbfs_nget(mp, NULL, "TheRooT", 7, &fattr, &vp);
 310         if (error)
 311                 return error;
 312         vp->v_flag |= VROOT;
 313         np = VTOSMB(vp);
 314         smp->sm_root = np;
 315         *vpp = vp;
 316         return 0;
 317 }
 318
 319 /*ARGSUSED*/
 320 int
 321 smbfs_init(struct vfsconf *vfsp)
 322 {
 323 #ifdef SMBFS_USEZONE
 324         smbfsmount_zone = zinit("SMBFSMOUNT", sizeof(struct smbmount), 0, 0, 1);
 325 #endif
 326         smbfs_pbuf_freecnt = nswbuf / 2 + 1;
 327         SMBVDEBUG("done.\n");
 328         return 0;
 329 }
 330
 331 /*ARGSUSED*/
 332 int
 333 smbfs_uninit(struct vfsconf *vfsp)
 334 {
 335         SMBVDEBUG("done.\n");
 336         return 0;
 337 }
 338
 339 /*
 340  * smbfs_statfs call
 341  */
 342 int
 343 smbfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred)
 344 {
 345         struct smbmount *smp = VFSTOSMBFS(mp);
 346         struct smbnode *np = smp->sm_root;
 347         struct smb_share *ssp = smp->sm_share;
 348         struct smb_cred scred;
 349         int error = 0;
 350
 351         if (np == NULL)
 352                 return EINVAL;
 353
 354         sbp->f_iosize = SSTOVC(ssp)->vc_txmax;          /* optimal transfer block size */
 355         sbp->f_spare2 = 0;                      /* placeholder */
 356         smb_makescred(&scred, curthread, cred);
 357
 358         if (SMB_DIALECT(SSTOVC(ssp)) >= SMB_DIALECT_LANMAN2_0)
 359                 error = smbfs_smb_statfs2(ssp, sbp, &scred);
 360         else
 361                 error = smbfs_smb_statfs(ssp, sbp, &scred);
 362         if (error)
 363                 return error;
 364         sbp->f_flags = 0;               /* copy of mount exported flags */
 365         if (sbp != &mp->mnt_stat) {
 366                 sbp->f_fsid = mp->mnt_stat.f_fsid;      /* file system id */
 367                 sbp->f_owner = mp->mnt_stat.f_owner;    /* user that mounted the filesystem */
 368                 sbp->f_type = mp->mnt_vfc->vfc_typenum; /* type of filesystem */
 369                 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
 370         }
 371         strncpy(sbp->f_fstypename, mp->mnt_vfc->vfc_name, MFSNAMELEN);
 372         return 0;
 373 }
 374
 375 /*
 376  * Flush out the buffer cache
 377  */
 378 /* ARGSUSED */
 379 static int
 380 smbfs_sync(struct mount *mp, int waitfor)
 381 {
 382         struct vnode *vp;
 383         int error, allerror = 0;
 384         /*
 385          * Force stale buffer cache information to be flushed.
 386          */
 387 loop:
 388         for (vp = TAILQ_FIRST(&mp->mnt_nvnodelist);
 389              vp != NULL;
 390              vp = TAILQ_NEXT(vp, v_nmntvnodes)) {
 391                 /*
 392                  * If the vnode that we are about to sync is no longer
 393                  * associated with this mount point, start over.
 394                  */
 395                 if (vp->v_mount != mp)
 396                         goto loop;
 397                 if (vn_islocked(vp) || RB_EMPTY(&vp->v_rbdirty_tree) ||
 398                     waitfor == MNT_LAZY)
 399                         continue;
 400                 if (vget(vp, LK_EXCLUSIVE))
 401                         goto loop;
 402                 error = VOP_FSYNC(vp, waitfor);
 403                 if (error)
 404                         allerror = error;
 405                 vput(vp);
 406         }
 407         return (allerror);
 408 }
 409
 410 #if defined(__FreeBSD__) && __FreeBSD_version < 400009
 411 /*
 412  * smbfs flat namespace lookup. Unsupported.
 413  */
 414 /* ARGSUSED */
 415 static int smbfs_vget(struct mount *mp, ino_t ino, struct vnode **vpp)
 416 {
 417         return (EOPNOTSUPP);
 418 }
 419
 420 /* ARGSUSED */
 421 static int smbfs_fhtovp(struct mount *mp, struct fid *fhp,
 422                         struct sockaddr *nam, struct vnode **vpp,
 423                         int *exflagsp, struct ucred **credanonp)
 424 {
 425         return (EINVAL);
 426 }
 427
 428 /*
 429  * Vnode pointer to File handle, should never happen either
 430  */
 431 /* ARGSUSED */
 432 static int
 433 smbfs_vptofh(struct vnode *vp, struct fid *fhp)
 434 {
 435         return (EINVAL);
 436 }
 437
 438 #endif /* __FreeBSD_version < 400009 */