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  */
  34
  35 #ifndef KLD_MODULE
  36 #include "opt_netsmb.h"
  37 #ifndef NETSMB
  38 #error "SMBFS requires option NETSMB"
  39 #endif
  40 #endif
  41
  42 #include <sys/param.h>
  43 #include <sys/systm.h>
  44 #include <sys/proc.h>
  45 #include <sys/kernel.h>
  46 #include <sys/sysctl.h>
  47 #include <sys/vnode.h>
  48 #include <sys/mount.h>
  49 #include <sys/stat.h>
  50 #include <sys/malloc.h>
  51 #include <sys/module.h>
  52
  53
  54 #include <netproto/smb/smb.h>
  55 #include <netproto/smb/smb_conn.h>
  56 #include <netproto/smb/smb_subr.h>
  57 #include <netproto/smb/smb_dev.h>
  58
  59 #include "smbfs.h"
  60 #include "smbfs_node.h"
  61 #include "smbfs_subr.h"
  62
  63 #include <sys/buf.h>
  64
  65 extern struct vop_ops smbfs_vnode_vops;
  66
  67 int smbfs_debuglevel = 0;
  68
  69 static int smbfs_version = SMBFS_VERSION;
  70
  71 SYSCTL_NODE(_vfs, OID_AUTO, smbfs, CTLFLAG_RW, 0, "SMB/CIFS file system");
  72 SYSCTL_INT(_vfs_smbfs, OID_AUTO, version, CTLFLAG_RD, &smbfs_version, 0, "");
  73 SYSCTL_INT(_vfs_smbfs, OID_AUTO, debuglevel, CTLFLAG_RW, &smbfs_debuglevel, 0, "");
  74
  75 static MALLOC_DEFINE(M_SMBFSHASH, "SMBFS hash", "SMBFS hash table");
  76
  77
  78 static int smbfs_mount(struct mount *, char *, caddr_t, struct ucred *);
  79 static int smbfs_root(struct mount *, struct vnode **);
  80 static int smbfs_statfs(struct mount *, struct statfs *, struct ucred *);
  81 static int smbfs_sync(struct mount *, int);
  82 static int smbfs_unmount(struct mount *, int);
  83 static int smbfs_init(struct vfsconf *vfsp);
  84 static int smbfs_uninit(struct vfsconf *vfsp);
  85
  86 static struct vfsops smbfs_vfsops = {
  87         .vfs_flags =            0,
  88         .vfs_mount =            smbfs_mount,
  89         .vfs_unmount =          smbfs_unmount,
  90         .vfs_root =             smbfs_root,
  91         .vfs_statfs =           smbfs_statfs,
  92         .vfs_sync =             smbfs_sync,
  93         .vfs_init =             smbfs_init,
  94         .vfs_uninit =           smbfs_uninit
  95 };
  96
  97
  98 VFS_SET(smbfs_vfsops, smbfs, VFCF_NETWORK);
  99 MODULE_VERSION(smbfs, 1);
 100
 101 MODULE_DEPEND(smbfs, netsmb, NSMB_VERSION, NSMB_VERSION, NSMB_VERSION);
 102 MODULE_DEPEND(smbfs, libiconv, 1, 1, 2);
 103 MODULE_DEPEND(smbfs, libmchain, 1, 1, 1);
 104
 105 int smbfs_pbuf_freecnt = -1;    /* start out unlimited */
 106
 107 static int
 108 smbfs_mount(struct mount *mp, char *path, caddr_t data, struct ucred *cred)
 109 {
 110         struct smbfs_args args;           /* will hold data from mount request */
 111         struct smbmount *smp = NULL;
 112         struct smb_vc *vcp;
 113         struct smb_share *ssp = NULL;
 114         struct vnode *vp;
 115         struct smb_cred scred;
 116         int error;
 117         int hsize;
 118         char *pc, *pe;
 119
 120         if (data == NULL) {
 121                 kprintf("missing data argument\n");
 122                 return EINVAL;
 123         }
 124         if (mp->mnt_flag & MNT_UPDATE) {
 125                 kprintf("MNT_UPDATE not implemented");
 126                 return EOPNOTSUPP;
 127         }
 128         error = copyin(data, (caddr_t)&args, sizeof(struct smbfs_args));
 129         if (error)
 130                 return error;
 131         if (args.version != SMBFS_VERSION) {
 132                 kprintf("mount version mismatch: kernel=%d, mount=%d\n",
 133                     SMBFS_VERSION, args.version);
 134                 return EINVAL;
 135         }
 136         smb_makescred(&scred, curthread, cred);
 137         error = smb_dev2share(args.dev, SMBM_EXEC, &scred, &ssp);
 138         if (error) {
 139                 kprintf("invalid device handle %d (%d)\n", args.dev, error);
 140                 return error;
 141         }
 142         vcp = SSTOVC(ssp);
 143         smb_share_unlock(ssp, 0);
 144         mp->mnt_stat.f_iosize = SSTOVC(ssp)->vc_txmax;
 145
 146         smp = kmalloc(sizeof(*smp), M_SMBFSDATA, M_WAITOK | M_USE_RESERVE | M_ZERO);
 147         mp->mnt_data = (qaddr_t)smp;
 148         smp->sm_cred = crhold(cred);
 149
 150         hsize = vfs_inodehashsize();
 151         smp->sm_hash = hashinit(hsize, M_SMBFSHASH, &smp->sm_hashlen);
 152         if (smp->sm_hash == NULL)
 153                 goto bad;
 154         lockinit(&smp->sm_hashlock, "smbfsh", 0, 0);
 155         smp->sm_share = ssp;
 156         smp->sm_root = NULL;
 157         smp->sm_args = args;
 158         smp->sm_caseopt = args.caseopt;
 159         smp->sm_args.file_mode = (smp->sm_args.file_mode &
 160                             (S_IRWXU|S_IRWXG|S_IRWXO)) | S_IFREG;
 161         smp->sm_args.dir_mode  = (smp->sm_args.dir_mode &
 162                             (S_IRWXU|S_IRWXG|S_IRWXO)) | S_IFDIR;
 163
 164 /*      simple_lock_init(&smp->sm_npslock);*/
 165         pc = mp->mnt_stat.f_mntfromname;
 166         pe = pc + sizeof(mp->mnt_stat.f_mntfromname);
 167         bzero(pc, MNAMELEN);
 168         *pc++ = '/';
 169         *pc++ = '/';
 170         pc=index(strncpy(pc, vcp->vc_username, pe - pc - 2), 0);
 171         if (pc < pe-1) {
 172                 *(pc++) = '@';
 173                 pc = index(strncpy(pc, vcp->vc_srvname, pe - pc - 2), 0);
 174                 if (pc < pe - 1) {
 175                         *(pc++) = '/';
 176                         strncpy(pc, ssp->ss_name, pe - pc - 2);
 177                 }
 178         }
 179         /* protect against invalid mount points */
 180         smp->sm_args.mount_point[sizeof(smp->sm_args.mount_point) - 1] = '\0';
 181         vfs_getnewfsid(mp);
 182
 183         vfs_add_vnodeops(mp, &smbfs_vnode_vops, &mp->mnt_vn_norm_ops);
 184
 185         error = smbfs_root(mp, &vp);
 186         if (error)
 187                 goto bad;
 188         vn_unlock(vp);
 189         SMBVDEBUG("root.v_refcnt = %08x\n", vp->v_refcnt);
 190
 191 #ifdef DIAGNOSTICS
 192         SMBERROR("mp=%p\n", mp);
 193 #endif
 194         return error;
 195 bad:
 196         if (smp) {
 197                 if (smp->sm_cred)
 198                         crfree(smp->sm_cred);
 199                 if (smp->sm_hash)
 200                         hashdestroy(smp->sm_hash, M_SMBFSHASH,
 201                             smp->sm_hashlen);
 202                 lockdestroy(&smp->sm_hashlock);
 203                 kfree(smp, M_SMBFSDATA);
 204         }
 205         if (ssp)
 206                 smb_share_put(ssp, &scred);
 207         return error;
 208 }
 209
 210 /* Unmount the filesystem described by mp. */
 211 static int
 212 smbfs_unmount(struct mount *mp, int mntflags)
 213 {
 214         struct smbmount *smp = VFSTOSMBFS(mp);
 215         struct smb_cred scred;
 216         int error, flags;
 217
 218         SMBVDEBUG("smbfs_unmount: flags=%04x\n", mntflags);
 219         flags = 0;
 220         if (mntflags & MNT_FORCE)
 221                 flags |= FORCECLOSE;
 222         /*
 223          * Keep trying to flush the vnode list for the mount while
 224          * some are still busy and we are making progress towards
 225          * making them not busy. This is needed because smbfs vnodes
 226          * reference their parent directory but may appear after their
 227          * parent in the list; one pass over the vnode list is not
 228          * sufficient in this case.
 229          */
 230         do {
 231                 smp->sm_didrele = 0;
 232                 /* There is 1 extra root vnode reference from smbfs_mount(). */
 233                 error = vflush(mp, 1, flags);
 234         } while (error == EBUSY && smp->sm_didrele != 0);
 235         if (error)
 236                 return error;
 237         smb_makescred(&scred, curthread, smp->sm_cred);
 238         error = smb_share_lock(smp->sm_share, LK_EXCLUSIVE);
 239         if (error)
 240                 goto out;
 241         smb_share_put(smp->sm_share, &scred);
 242         mp->mnt_data = (qaddr_t)0;
 243
 244         if (smp->sm_cred)
 245                 crfree(smp->sm_cred);
 246         if (smp->sm_hash)
 247                 hashdestroy(smp->sm_hash, M_SMBFSHASH, smp->sm_hashlen);
 248         lockdestroy(&smp->sm_hashlock);
 249         kfree(smp, M_SMBFSDATA);
 250         mp->mnt_flag &= ~MNT_LOCAL;
 251 out:
 252         return error;
 253 }
 254
 255 /*
 256  * Return locked root vnode of a filesystem
 257  */
 258 static int
 259 smbfs_root(struct mount *mp, struct vnode **vpp)
 260 {
 261         struct thread *td = curthread;  /* XXX */
 262         struct smbmount *smp = VFSTOSMBFS(mp);
 263         struct vnode *vp;
 264         struct smbnode *np;
 265         struct smbfattr fattr;
 266         struct ucred *cred;
 267         struct smb_cred scred;
 268         int error;
 269
 270         if (smp == NULL) {
 271                 SMBERROR("smp == NULL (bug in umount)\n");
 272                 return EINVAL;
 273         }
 274         if (smp->sm_root) {
 275                 *vpp = SMBTOV(smp->sm_root);
 276                 return vget(*vpp, LK_EXCLUSIVE | LK_RETRY);
 277         }
 278         if (td->td_proc)
 279                 cred = td->td_proc->p_ucred;
 280         else
 281                 cred = proc0.p_ucred;
 282
 283         smb_makescred(&scred, td, cred);
 284         error = smbfs_smb_lookup(NULL, NULL, 0, &fattr, &scred);
 285         if (error)
 286                 return error;
 287         error = smbfs_nget(mp, NULL, "TheRooT", 7, &fattr, &vp);
 288         if (error)
 289                 return error;
 290         vsetflags(vp, VROOT);
 291         np = VTOSMB(vp);
 292         smp->sm_root = np;
 293         *vpp = vp;
 294         return 0;
 295 }
 296
 297 /*ARGSUSED*/
 298 int
 299 smbfs_init(struct vfsconf *vfsp)
 300 {
 301         smbfs_pbuf_freecnt = nswbuf_kva / 2 + 1;
 302         SMBVDEBUG("done.\n");
 303         return 0;
 304 }
 305
 306 /*ARGSUSED*/
 307 int
 308 smbfs_uninit(struct vfsconf *vfsp)
 309 {
 310         SMBVDEBUG("done.\n");
 311         return 0;
 312 }
 313
 314 /*
 315  * smbfs_statfs call
 316  */
 317 int
 318 smbfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred)
 319 {
 320         struct smbmount *smp = VFSTOSMBFS(mp);
 321         struct smbnode *np = smp->sm_root;
 322         struct smb_share *ssp = smp->sm_share;
 323         struct smb_cred scred;
 324         int error = 0;
 325
 326         if (np == NULL)
 327                 return EINVAL;
 328
 329         sbp->f_iosize = SSTOVC(ssp)->vc_txmax;          /* optimal transfer block size */
 330         sbp->f_spare2 = 0;                      /* placeholder */
 331         smb_makescred(&scred, curthread, cred);
 332
 333         if (SMB_DIALECT(SSTOVC(ssp)) >= SMB_DIALECT_LANMAN2_0)
 334                 error = smbfs_smb_statfs2(ssp, sbp, &scred);
 335         else
 336                 error = smbfs_smb_statfs(ssp, sbp, &scred);
 337         if (error)
 338                 return error;
 339         sbp->f_flags = 0;               /* copy of mount exported flags */
 340         if (sbp != &mp->mnt_stat) {
 341                 sbp->f_fsid = mp->mnt_stat.f_fsid;      /* file system id */
 342                 sbp->f_owner = mp->mnt_stat.f_owner;    /* user that mounted the filesystem */
 343                 sbp->f_type = mp->mnt_vfc->vfc_typenum; /* type of filesystem */
 344                 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
 345         }
 346         strncpy(sbp->f_fstypename, mp->mnt_vfc->vfc_name, MFSNAMELEN);
 347         return 0;
 348 }
 349
 350 /*
 351  * Flush out the buffer cache
 352  */
 353 /* ARGSUSED */
 354 static int
 355 smbfs_sync(struct mount *mp, int waitfor)
 356 {
 357         struct vnode *vp;
 358         int error, allerror = 0;
 359         /*
 360          * Force stale buffer cache information to be flushed.
 361          */
 362 loop:
 363         for (vp = TAILQ_FIRST(&mp->mnt_nvnodelist);
 364              vp != NULL;
 365              vp = TAILQ_NEXT(vp, v_nmntvnodes)) {
 366                 /*
 367                  * If the vnode that we are about to sync is no longer
 368                  * associated with this mount point, start over.
 369                  */
 370                 if (vp->v_mount != mp)
 371                         goto loop;
 372                 if (vn_islocked(vp) || RB_EMPTY(&vp->v_rbdirty_tree) ||
 373                     (waitfor & MNT_LAZY))
 374                         continue;
 375                 if (vget(vp, LK_EXCLUSIVE))
 376                         goto loop;
 377                 error = VOP_FSYNC(vp, waitfor, 0);
 378                 if (error)
 379                         allerror = error;
 380                 vput(vp);
 381         }
 382         return (allerror);
 383 }