The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/fs/smbfs/smbfs_vfsops.c

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    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  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  *
   26  * $FreeBSD$
   27  */
   28 
   29 #include <sys/param.h>
   30 #include <sys/systm.h>
   31 #include <sys/proc.h>
   32 #include <sys/bio.h>
   33 #include <sys/buf.h>
   34 #include <sys/kernel.h>
   35 #include <sys/sysctl.h>
   36 #include <sys/vnode.h>
   37 #include <sys/mount.h>
   38 #include <sys/stat.h>
   39 #include <sys/malloc.h>
   40 #include <sys/module.h>
   41 #include <sys/sx.h>
   42 
   43 
   44 #include <netsmb/smb.h>
   45 #include <netsmb/smb_conn.h>
   46 #include <netsmb/smb_subr.h>
   47 #include <netsmb/smb_dev.h>
   48 
   49 #include <fs/smbfs/smbfs.h>
   50 #include <fs/smbfs/smbfs_node.h>
   51 #include <fs/smbfs/smbfs_subr.h>
   52 
   53 static int smbfs_debuglevel = 0;
   54 
   55 static int smbfs_version = SMBFS_VERSION;
   56 
   57 SYSCTL_NODE(_vfs, OID_AUTO, smbfs, CTLFLAG_RW, 0, "SMB/CIFS filesystem");
   58 SYSCTL_INT(_vfs_smbfs, OID_AUTO, version, CTLFLAG_RD, &smbfs_version, 0, "");
   59 SYSCTL_INT(_vfs_smbfs, OID_AUTO, debuglevel, CTLFLAG_RW, &smbfs_debuglevel, 0, "");
   60 
   61 static vfs_init_t       smbfs_init;
   62 static vfs_uninit_t     smbfs_uninit;
   63 static vfs_cmount_t     smbfs_cmount;
   64 static vfs_mount_t      smbfs_mount;
   65 static vfs_root_t       smbfs_root;
   66 static vfs_quotactl_t   smbfs_quotactl;
   67 static vfs_statfs_t     smbfs_statfs;
   68 static vfs_unmount_t    smbfs_unmount;
   69 
   70 static struct vfsops smbfs_vfsops = {
   71         .vfs_init =             smbfs_init,
   72         .vfs_cmount =           smbfs_cmount,
   73         .vfs_mount =            smbfs_mount,
   74         .vfs_quotactl =         smbfs_quotactl,
   75         .vfs_root =             smbfs_root,
   76         .vfs_statfs =           smbfs_statfs,
   77         .vfs_sync =             vfs_stdsync,
   78         .vfs_uninit =           smbfs_uninit,
   79         .vfs_unmount =          smbfs_unmount,
   80 };
   81 
   82 
   83 VFS_SET(smbfs_vfsops, smbfs, VFCF_NETWORK);
   84 
   85 MODULE_DEPEND(smbfs, netsmb, NSMB_VERSION, NSMB_VERSION, NSMB_VERSION);
   86 MODULE_DEPEND(smbfs, libiconv, 1, 1, 2);
   87 MODULE_DEPEND(smbfs, libmchain, 1, 1, 1);
   88 
   89 int smbfs_pbuf_freecnt = -1;    /* start out unlimited */
   90 
   91 static int
   92 smbfs_cmount(struct mntarg *ma, void * data, uint64_t flags)
   93 {
   94         struct smbfs_args args;
   95         int error;
   96 
   97         error = copyin(data, &args, sizeof(struct smbfs_args));
   98         if (error)
   99                 return error;
  100 
  101         if (args.version != SMBFS_VERSION) {
  102                 printf("mount version mismatch: kernel=%d, mount=%d\n",
  103                     SMBFS_VERSION, args.version);
  104                 return EINVAL;
  105         }
  106         ma = mount_argf(ma, "dev", "%d", args.dev);
  107         ma = mount_argb(ma, args.flags & SMBFS_MOUNT_SOFT, "nosoft");
  108         ma = mount_argb(ma, args.flags & SMBFS_MOUNT_INTR, "nointr");
  109         ma = mount_argb(ma, args.flags & SMBFS_MOUNT_STRONG, "nostrong");
  110         ma = mount_argb(ma, args.flags & SMBFS_MOUNT_HAVE_NLS, "nohave_nls");
  111         ma = mount_argb(ma, !(args.flags & SMBFS_MOUNT_NO_LONG), "nolong");
  112         ma = mount_arg(ma, "rootpath", args.root_path, -1);
  113         ma = mount_argf(ma, "uid", "%d", args.uid);
  114         ma = mount_argf(ma, "gid", "%d", args.gid);
  115         ma = mount_argf(ma, "file_mode", "%d", args.file_mode);
  116         ma = mount_argf(ma, "dir_mode", "%d", args.dir_mode);
  117         ma = mount_argf(ma, "caseopt", "%d", args.caseopt);
  118 
  119         error = kernel_mount(ma, flags);
  120 
  121         return (error);
  122 }
  123 
  124 static const char *smbfs_opts[] = {
  125         "fd", "soft", "intr", "strong", "have_nls", "long",
  126         "mountpoint", "rootpath", "uid", "gid", "file_mode", "dir_mode",
  127         "caseopt", "errmsg", NULL
  128 };
  129 
  130 static int
  131 smbfs_mount(struct mount *mp)
  132 {
  133         struct smbmount *smp = NULL;
  134         struct smb_vc *vcp;
  135         struct smb_share *ssp = NULL;
  136         struct vnode *vp;
  137         struct thread *td;
  138         struct smb_dev *dev;
  139         struct smb_cred *scred;
  140         int error, v;
  141         char *pc, *pe;
  142 
  143         dev = NULL;
  144         td = curthread;
  145         if (mp->mnt_flag & (MNT_UPDATE | MNT_ROOTFS))
  146                 return EOPNOTSUPP;
  147 
  148         if (vfs_filteropt(mp->mnt_optnew, smbfs_opts)) {
  149                 vfs_mount_error(mp, "%s", "Invalid option");
  150                 return (EINVAL);
  151         }
  152 
  153         scred = smbfs_malloc_scred();
  154         smb_makescred(scred, td, td->td_ucred);
  155         
  156         /* Ask userspace of `fd`, the file descriptor of this session */
  157         if (1 != vfs_scanopt(mp->mnt_optnew, "fd", "%d", &v)) {
  158                 vfs_mount_error(mp, "No fd option");
  159                 smbfs_free_scred(scred);
  160                 return (EINVAL);
  161         }
  162         error = smb_dev2share(v, SMBM_EXEC, scred, &ssp, &dev);
  163         smp = malloc(sizeof(*smp), M_SMBFSDATA, M_WAITOK | M_ZERO);
  164         if (error) {
  165                 printf("invalid device handle %d (%d)\n", v, error);
  166                 vfs_mount_error(mp, "invalid device handle %d %d\n", v, error);
  167                 smbfs_free_scred(scred);
  168                 free(smp, M_SMBFSDATA);
  169                 return error;
  170         }
  171         vcp = SSTOVC(ssp);
  172         smb_share_unlock(ssp);
  173         mp->mnt_stat.f_iosize = SSTOVC(ssp)->vc_txmax;
  174         mp->mnt_data = smp;
  175         smp->sm_share = ssp;
  176         smp->sm_root = NULL;
  177         smp->sm_dev = dev;
  178         if (1 != vfs_scanopt(mp->mnt_optnew,
  179             "caseopt", "%d", &smp->sm_caseopt)) {
  180                 vfs_mount_error(mp, "Invalid caseopt");
  181                 error = EINVAL;
  182                 goto bad;
  183         }
  184         if (1 != vfs_scanopt(mp->mnt_optnew, "uid", "%d", &v)) {
  185                 vfs_mount_error(mp, "Invalid uid");
  186                 error = EINVAL;
  187                 goto bad;
  188         }
  189         smp->sm_uid = v;
  190 
  191         if (1 != vfs_scanopt(mp->mnt_optnew, "gid", "%d", &v)) {
  192                 vfs_mount_error(mp, "Invalid gid");
  193                 error = EINVAL;
  194                 goto bad;
  195         }
  196         smp->sm_gid = v;
  197 
  198         if (1 != vfs_scanopt(mp->mnt_optnew, "file_mode", "%d", &v)) {
  199                 vfs_mount_error(mp, "Invalid file_mode");
  200                 error = EINVAL;
  201                 goto bad;
  202         }
  203         smp->sm_file_mode = (v & (S_IRWXU|S_IRWXG|S_IRWXO)) | S_IFREG;
  204 
  205         if (1 != vfs_scanopt(mp->mnt_optnew, "dir_mode", "%d", &v)) {
  206                 vfs_mount_error(mp, "Invalid dir_mode");
  207                 error = EINVAL;
  208                 goto bad;
  209         }
  210         smp->sm_dir_mode  = (v & (S_IRWXU|S_IRWXG|S_IRWXO)) | S_IFDIR;
  211 
  212         vfs_flagopt(mp->mnt_optnew,
  213             "nolong", &smp->sm_flags, SMBFS_MOUNT_NO_LONG);
  214 
  215         pc = mp->mnt_stat.f_mntfromname;
  216         pe = pc + sizeof(mp->mnt_stat.f_mntfromname);
  217         bzero(pc, MNAMELEN);
  218         *pc++ = '/';
  219         *pc++ = '/';
  220         pc = strchr(strncpy(pc, vcp->vc_username, pe - pc - 2), 0);
  221         if (pc < pe-1) {
  222                 *(pc++) = '@';
  223                 pc = strchr(strncpy(pc, vcp->vc_srvname, pe - pc - 2), 0);
  224                 if (pc < pe - 1) {
  225                         *(pc++) = '/';
  226                         strncpy(pc, ssp->ss_name, pe - pc - 2);
  227                 }
  228         }
  229         vfs_getnewfsid(mp);
  230         error = smbfs_root(mp, LK_EXCLUSIVE, &vp);
  231         if (error) {
  232                 vfs_mount_error(mp, "smbfs_root error: %d", error);
  233                 goto bad;
  234         }
  235         VOP_UNLOCK(vp, 0);
  236         SMBVDEBUG("root.v_usecount = %d\n", vrefcnt(vp));
  237 
  238 #ifdef DIAGNOSTIC
  239         SMBERROR("mp=%p\n", mp);
  240 #endif
  241         smbfs_free_scred(scred);
  242         return error;
  243 bad:
  244         if (ssp)
  245                 smb_share_put(ssp, scred);
  246         smbfs_free_scred(scred);        
  247         SMB_LOCK();
  248         if (error && smp->sm_dev == dev) {
  249                 smp->sm_dev = NULL;
  250                 sdp_trydestroy(dev);
  251         }
  252         SMB_UNLOCK();
  253         free(smp, M_SMBFSDATA);
  254         return error;
  255 }
  256 
  257 /* Unmount the filesystem described by mp. */
  258 static int
  259 smbfs_unmount(struct mount *mp, int mntflags)
  260 {
  261         struct thread *td;
  262         struct smbmount *smp = VFSTOSMBFS(mp);
  263         struct smb_cred *scred;
  264         struct smb_dev *dev;
  265         int error, flags;
  266 
  267         SMBVDEBUG("smbfs_unmount: flags=%04x\n", mntflags);
  268         td = curthread;
  269         flags = 0;
  270         if (mntflags & MNT_FORCE)
  271                 flags |= FORCECLOSE;
  272         /*
  273          * Keep trying to flush the vnode list for the mount while 
  274          * some are still busy and we are making progress towards
  275          * making them not busy. This is needed because smbfs vnodes
  276          * reference their parent directory but may appear after their
  277          * parent in the list; one pass over the vnode list is not
  278          * sufficient in this case.
  279          */
  280         do {
  281                 smp->sm_didrele = 0;
  282                 /* There is 1 extra root vnode reference from smbfs_mount(). */
  283                 error = vflush(mp, 1, flags, td);
  284         } while (error == EBUSY && smp->sm_didrele != 0);
  285         if (error)
  286                 return error;
  287         scred = smbfs_malloc_scred();
  288         smb_makescred(scred, td, td->td_ucred);
  289         error = smb_share_lock(smp->sm_share);
  290         if (error)
  291                 goto out;
  292         smb_share_put(smp->sm_share, scred);
  293         SMB_LOCK();
  294         dev = smp->sm_dev;
  295         if (!dev)
  296                 panic("No private data for mount point");
  297         sdp_trydestroy(dev);
  298         mp->mnt_data = NULL;
  299         SMB_UNLOCK();
  300         free(smp, M_SMBFSDATA);
  301         MNT_ILOCK(mp);
  302         mp->mnt_flag &= ~MNT_LOCAL;
  303         MNT_IUNLOCK(mp);
  304 out:
  305         smbfs_free_scred(scred);
  306         return error;
  307 }
  308 
  309 /* 
  310  * Return locked root vnode of a filesystem
  311  */
  312 static int
  313 smbfs_root(struct mount *mp, int flags, struct vnode **vpp)
  314 {
  315         struct smbmount *smp = VFSTOSMBFS(mp);
  316         struct vnode *vp;
  317         struct smbnode *np;
  318         struct smbfattr fattr;
  319         struct thread *td;
  320         struct ucred *cred;
  321         struct smb_cred *scred;
  322         int error;
  323 
  324         td = curthread;
  325         cred = td->td_ucred;
  326 
  327         if (smp->sm_root) {
  328                 *vpp = SMBTOV(smp->sm_root);
  329                 return vget(*vpp, LK_EXCLUSIVE | LK_RETRY, td);
  330         }
  331         scred = smbfs_malloc_scred();
  332         smb_makescred(scred, td, cred);
  333         error = smbfs_smb_lookup(NULL, NULL, 0, &fattr, scred);
  334         if (error)
  335                 goto out;
  336         error = smbfs_nget(mp, NULL, NULL, 0, &fattr, &vp);
  337         if (error)
  338                 goto out;
  339         ASSERT_VOP_LOCKED(vp, "smbfs_root");
  340         vp->v_vflag |= VV_ROOT;
  341         np = VTOSMB(vp);
  342         smp->sm_root = np;
  343         *vpp = vp;
  344 out:
  345         smbfs_free_scred(scred);
  346         return error;
  347 }
  348 
  349 /*
  350  * Do operations associated with quotas, not supported
  351  */
  352 /* ARGSUSED */
  353 static int
  354 smbfs_quotactl(mp, cmd, uid, arg)
  355         struct mount *mp;
  356         int cmd;
  357         uid_t uid;
  358         void *arg;
  359 {
  360         SMBVDEBUG("return EOPNOTSUPP\n");
  361         return EOPNOTSUPP;
  362 }
  363 
  364 /*ARGSUSED*/
  365 int
  366 smbfs_init(struct vfsconf *vfsp)
  367 {
  368         smbfs_pbuf_freecnt = nswbuf / 2 + 1;
  369         SMBVDEBUG("done.\n");
  370         return 0;
  371 }
  372 
  373 /*ARGSUSED*/
  374 int
  375 smbfs_uninit(struct vfsconf *vfsp)
  376 {
  377 
  378         SMBVDEBUG("done.\n");
  379         return 0;
  380 }
  381 
  382 /*
  383  * smbfs_statfs call
  384  */
  385 int
  386 smbfs_statfs(struct mount *mp, struct statfs *sbp)
  387 {
  388         struct thread *td = curthread;
  389         struct smbmount *smp = VFSTOSMBFS(mp);
  390         struct smbnode *np = smp->sm_root;
  391         struct smb_share *ssp = smp->sm_share;
  392         struct smb_cred *scred;
  393         int error;
  394 
  395         if (np == NULL) {
  396                 vfs_mount_error(mp, "np == NULL");
  397                 return EINVAL;
  398         }
  399         
  400         sbp->f_iosize = SSTOVC(ssp)->vc_txmax;          /* optimal transfer block size */
  401         scred = smbfs_malloc_scred();
  402         smb_makescred(scred, td, td->td_ucred);
  403         error = smbfs_smb_statfs(ssp, sbp, scred);
  404         smbfs_free_scred(scred);
  405         return (error);
  406 }

Cache object: 6ac11702f83bd6af4ecda6c25cfe83db


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