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