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

     /*-
      * Copyright (c) 2000-2001, Boris Popov
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      * 1. Redistributions of source code must retain the above copyright
      *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *    This product includes software developed by Boris Popov.
     * 4. Neither the name of the author nor the names of any co-contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     * $FreeBSD$
     */
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/proc.h>
    #include <sys/bio.h>
    #include <sys/buf.h>
    #include <sys/kernel.h>
    #include <sys/sysctl.h>
    #include <sys/vnode.h>
    #include <sys/mount.h>
    #include <sys/stat.h>
    #include <sys/malloc.h>
    #include <sys/module.h>
    #include <sys/sx.h>
    
    
    #include <netsmb/smb.h>
    #include <netsmb/smb_conn.h>
    #include <netsmb/smb_subr.h>
    #include <netsmb/smb_dev.h>
    
    #include <fs/smbfs/smbfs.h>
    #include <fs/smbfs/smbfs_node.h>
    #include <fs/smbfs/smbfs_subr.h>
    
    static int smbfs_debuglevel = 0;
    
    static int smbfs_version = SMBFS_VERSION;
    
    #ifdef SMBFS_USEZONE
    #include <vm/vm.h>
    #include <vm/vm_extern.h>
    
    vm_zone_t smbfsmount_zone;
    #endif
    
    SYSCTL_NODE(_vfs, OID_AUTO, smbfs, CTLFLAG_RW, 0, "SMB/CIFS filesystem");
    SYSCTL_INT(_vfs_smbfs, OID_AUTO, version, CTLFLAG_RD, &smbfs_version, 0, "");
    SYSCTL_INT(_vfs_smbfs, OID_AUTO, debuglevel, CTLFLAG_RW, &smbfs_debuglevel, 0, "");
    
    static MALLOC_DEFINE(M_SMBFSHASH, "smbfs_hash", "SMBFS hash table");
    
    static vfs_init_t       smbfs_init;
    static vfs_uninit_t     smbfs_uninit;
    static vfs_cmount_t     smbfs_cmount;
    static vfs_mount_t      smbfs_mount;
    static vfs_root_t       smbfs_root;
    static vfs_quotactl_t   smbfs_quotactl;
    static vfs_statfs_t     smbfs_statfs;
    static vfs_unmount_t    smbfs_unmount;
    
    static struct vfsops smbfs_vfsops = {
            .vfs_init =             smbfs_init,
            .vfs_cmount =           smbfs_cmount,
            .vfs_mount =            smbfs_mount,
            .vfs_quotactl =         smbfs_quotactl,
            .vfs_root =             smbfs_root,
            .vfs_statfs =           smbfs_statfs,
            .vfs_sync =             vfs_stdsync,
            .vfs_uninit =           smbfs_uninit,
            .vfs_unmount =          smbfs_unmount,
    };
    
    
    VFS_SET(smbfs_vfsops, smbfs, VFCF_NETWORK);
    
   MODULE_DEPEND(smbfs, netsmb, NSMB_VERSION, NSMB_VERSION, NSMB_VERSION);
   MODULE_DEPEND(smbfs, libiconv, 1, 1, 2);
   MODULE_DEPEND(smbfs, libmchain, 1, 1, 1);
   
   int smbfs_pbuf_freecnt = -1;    /* start out unlimited */
   
   static int
   smbfs_cmount(struct mntarg *ma, void * data, int flags, struct thread *td)
   {
           struct smbfs_args args;
           int error;
   
           error = copyin(data, &args, sizeof(struct smbfs_args));
           if (error)
                   return error;
   
           if (args.version != SMBFS_VERSION) {
                   printf("mount version mismatch: kernel=%d, mount=%d\n",
                       SMBFS_VERSION, args.version);
                   return EINVAL;
           }
           ma = mount_argf(ma, "dev", "%d", args.dev);
           ma = mount_argb(ma, args.flags & SMBFS_MOUNT_SOFT, "nosoft");
           ma = mount_argb(ma, args.flags & SMBFS_MOUNT_INTR, "nointr");
           ma = mount_argb(ma, args.flags & SMBFS_MOUNT_STRONG, "nostrong");
           ma = mount_argb(ma, args.flags & SMBFS_MOUNT_HAVE_NLS, "nohave_nls");
           ma = mount_argb(ma, !(args.flags & SMBFS_MOUNT_NO_LONG), "nolong");
           ma = mount_arg(ma, "rootpath", args.root_path, -1);
           ma = mount_argf(ma, "uid", "%d", args.uid);
           ma = mount_argf(ma, "gid", "%d", args.gid);
           ma = mount_argf(ma, "file_mode", "%d", args.file_mode);
           ma = mount_argf(ma, "dir_mode", "%d", args.dir_mode);
           ma = mount_argf(ma, "caseopt", "%d", args.caseopt);
   
           error = kernel_mount(ma, flags);
   
           return (error);
   }
   
   static const char *smbfs_opts[] = {
           "dev", "soft", "intr", "strong", "have_nls", "long",
           "mountpoint", "rootpath", "uid", "gid", "file_mode", "dir_mode",
           "caseopt", "errmsg", NULL
   };
   
   static int
   smbfs_mount(struct mount *mp, struct thread *td)
   {
           struct smbmount *smp = NULL;
           struct smb_vc *vcp;
           struct smb_share *ssp = NULL;
           struct vnode *vp;
           struct smb_cred scred;
           int error, v;
           char *pc, *pe;
   
           if (mp->mnt_flag & (MNT_UPDATE | MNT_ROOTFS))
                   return EOPNOTSUPP;
   
           if (vfs_filteropt(mp->mnt_optnew, smbfs_opts)) {
                   vfs_mount_error(mp, "%s", "Invalid option");
                   return (EINVAL);
           }
   
           smb_makescred(&scred, td, td->td_ucred);
           if (1 != vfs_scanopt(mp->mnt_optnew, "dev", "%d", &v)) {
                   vfs_mount_error(mp, "No dev option");
                   return (EINVAL);
           }
           error = smb_dev2share(v, SMBM_EXEC, &scred, &ssp);
           if (error) {
                   printf("invalid device handle %d (%d)\n", v, error);
                   vfs_mount_error(mp, "invalid device handle %d (%d)\n", v, error);
                   return error;
           }
           vcp = SSTOVC(ssp);
           smb_share_unlock(ssp, 0, td);
           mp->mnt_stat.f_iosize = SSTOVC(ssp)->vc_txmax;
   
   #ifdef SMBFS_USEZONE
           smp = zalloc(smbfsmount_zone);
   #else
           MALLOC(smp, struct smbmount*, sizeof(*smp), M_SMBFSDATA,
               M_WAITOK|M_USE_RESERVE);
   #endif
           if (smp == NULL) {
                   printf("could not alloc smbmount\n");
                   vfs_mount_error(mp, "could not alloc smbmount", v, error);
                   error = ENOMEM;
                   goto bad;
           }
           bzero(smp, sizeof(*smp));
           mp->mnt_data = (qaddr_t)smp;
           smp->sm_hash = hashinit(desiredvnodes, M_SMBFSHASH, &smp->sm_hashlen);
           if (smp->sm_hash == NULL)
                   goto bad;
           sx_init(&smp->sm_hashlock, "smbfsh");
           smp->sm_share = ssp;
           smp->sm_root = NULL;
           if (1 != vfs_scanopt(mp->mnt_optnew,
               "caseopt", "%d", &smp->sm_caseopt)) {
                   vfs_mount_error(mp, "Invalid caseopt");
                   error = EINVAL;
                   goto bad;
           }
           if (1 != vfs_scanopt(mp->mnt_optnew, "uid", "%d", &v)) {
                   vfs_mount_error(mp, "Invalid uid");
                   error = EINVAL;
                   goto bad;
           }
           smp->sm_uid = v;
   
           if (1 != vfs_scanopt(mp->mnt_optnew, "gid", "%d", &v)) {
                   vfs_mount_error(mp, "Invalid gid");
                   error = EINVAL;
                   goto bad;
           }
           smp->sm_gid = v;
   
           if (1 != vfs_scanopt(mp->mnt_optnew, "file_mode", "%d", &v)) {
                   vfs_mount_error(mp, "Invalid file_mode");
                   error = EINVAL;
                   goto bad;
           }
           smp->sm_file_mode = (v & (S_IRWXU|S_IRWXG|S_IRWXO)) | S_IFREG;
   
           if (1 != vfs_scanopt(mp->mnt_optnew, "dir_mode", "%d", &v)) {
                   vfs_mount_error(mp, "Invalid dir_mode");
                   error = EINVAL;
                   goto bad;
           }
           smp->sm_dir_mode  = (v & (S_IRWXU|S_IRWXG|S_IRWXO)) | S_IFDIR;
   
           vfs_flagopt(mp->mnt_optnew,
               "nolong", &smp->sm_flags, SMBFS_MOUNT_NO_LONG);
   
   /*      simple_lock_init(&smp->sm_npslock);*/
           pc = mp->mnt_stat.f_mntfromname;
           pe = pc + sizeof(mp->mnt_stat.f_mntfromname);
           bzero(pc, MNAMELEN);
           *pc++ = '/';
           *pc++ = '/';
           pc=index(strncpy(pc, vcp->vc_username, pe - pc - 2), 0);
           if (pc < pe-1) {
                   *(pc++) = '@';
                   pc = index(strncpy(pc, vcp->vc_srvname, pe - pc - 2), 0);
                   if (pc < pe - 1) {
                           *(pc++) = '/';
                           strncpy(pc, ssp->ss_name, pe - pc - 2);
                   }
           }
           vfs_getnewfsid(mp);
           error = smbfs_root(mp, LK_EXCLUSIVE, &vp, td);
           if (error) {
                   vfs_mount_error(mp, "smbfs_root error: %d", error);
                   goto bad;
           }
           VOP_UNLOCK(vp, 0, td);
           SMBVDEBUG("root.v_usecount = %d\n", vrefcnt(vp));
   
   #ifdef DIAGNOSTICS
           SMBERROR("mp=%p\n", mp);
   #endif
           return error;
   bad:
           if (smp) {
                   if (smp->sm_hash)
                           free(smp->sm_hash, M_SMBFSHASH);
                   sx_destroy(&smp->sm_hashlock);
   #ifdef SMBFS_USEZONE
                   zfree(smbfsmount_zone, smp);
   #else
                   free(smp, M_SMBFSDATA);
   #endif
           }
           if (ssp)
                   smb_share_put(ssp, &scred);
           return error;
   }
   
   /* Unmount the filesystem described by mp. */
   static int
   smbfs_unmount(struct mount *mp, int mntflags, struct thread *td)
   {
           struct smbmount *smp = VFSTOSMBFS(mp);
           struct smb_cred scred;
           int error, flags;
   
           SMBVDEBUG("smbfs_unmount: flags=%04x\n", mntflags);
           flags = 0;
           if (mntflags & MNT_FORCE)
                   flags |= FORCECLOSE;
           /*
            * Keep trying to flush the vnode list for the mount while 
            * some are still busy and we are making progress towards
            * making them not busy. This is needed because smbfs vnodes
            * reference their parent directory but may appear after their
            * parent in the list; one pass over the vnode list is not
            * sufficient in this case.
            */
           do {
                   smp->sm_didrele = 0;
                   /* There is 1 extra root vnode reference from smbfs_mount(). */
                   error = vflush(mp, 1, flags, td);
           } while (error == EBUSY && smp->sm_didrele != 0);
           if (error)
                   return error;
           smb_makescred(&scred, td, td->td_ucred);
           error = smb_share_lock(smp->sm_share, LK_EXCLUSIVE, td);
           if (error)
                   return error;
           smb_share_put(smp->sm_share, &scred);
           mp->mnt_data = (qaddr_t)0;
   
           if (smp->sm_hash)
                   free(smp->sm_hash, M_SMBFSHASH);
           sx_destroy(&smp->sm_hashlock);
   #ifdef SMBFS_USEZONE
           zfree(smbfsmount_zone, smp);
   #else
           free(smp, M_SMBFSDATA);
   #endif
           MNT_ILOCK(mp);
           mp->mnt_flag &= ~MNT_LOCAL;
           MNT_IUNLOCK(mp);
           return error;
   }
   
   /* 
    * Return locked root vnode of a filesystem
    */
   static int
   smbfs_root(struct mount *mp, int flags, struct vnode **vpp, struct thread *td)
   {
           struct smbmount *smp = VFSTOSMBFS(mp);
           struct vnode *vp;
           struct smbnode *np;
           struct smbfattr fattr;
           struct ucred *cred = td->td_ucred;
           struct smb_cred scred;
           int error;
   
           if (smp == NULL) {
                   SMBERROR("smp == NULL (bug in umount)\n");
                   vfs_mount_error(mp, "smp == NULL (bug in umount)");
                   return EINVAL;
           }
           if (smp->sm_root) {
                   *vpp = SMBTOV(smp->sm_root);
                   return vget(*vpp, LK_EXCLUSIVE | LK_RETRY, td);
           }
           smb_makescred(&scred, td, cred);
           error = smbfs_smb_lookup(NULL, NULL, 0, &fattr, &scred);
           if (error)
                   return error;
           error = smbfs_nget(mp, NULL, "TheRooT", 7, &fattr, &vp);
           if (error)
                   return error;
           ASSERT_VOP_LOCKED(vp, "smbfs_root");
           vp->v_vflag |= VV_ROOT;
           np = VTOSMB(vp);
           smp->sm_root = np;
           *vpp = vp;
           return 0;
   }
   
   /*
    * Do operations associated with quotas, not supported
    */
   /* ARGSUSED */
   static int
   smbfs_quotactl(mp, cmd, uid, arg, td)
           struct mount *mp;
           int cmd;
           uid_t uid;
           void *arg;
           struct thread *td;
   {
           SMBVDEBUG("return EOPNOTSUPP\n");
           return EOPNOTSUPP;
   }
   
   /*ARGSUSED*/
   int
   smbfs_init(struct vfsconf *vfsp)
   {
   #ifdef SMBFS_USEZONE
           smbfsmount_zone = zinit("SMBFSMOUNT", sizeof(struct smbmount), 0, 0, 1);
   #endif
           smbfs_pbuf_freecnt = nswbuf / 2 + 1;
           SMBVDEBUG("done.\n");
           return 0;
   }
   
   /*ARGSUSED*/
   int
   smbfs_uninit(struct vfsconf *vfsp)
   {
   
           SMBVDEBUG("done.\n");
           return 0;
   }
   
   /*
    * smbfs_statfs call
    */
   int
   smbfs_statfs(struct mount *mp, struct statfs *sbp, struct thread *td)
   {
           struct smbmount *smp = VFSTOSMBFS(mp);
           struct smbnode *np = smp->sm_root;
           struct smb_share *ssp = smp->sm_share;
           struct smb_cred scred;
           int error = 0;
   
           if (np == NULL) {
                   vfs_mount_error(mp, "np == NULL");
                   return EINVAL;
           }
           
           sbp->f_iosize = SSTOVC(ssp)->vc_txmax;          /* optimal transfer block size */
           smb_makescred(&scred, td, td->td_ucred);
   
           if (SMB_DIALECT(SSTOVC(ssp)) >= SMB_DIALECT_LANMAN2_0)
                   error = smbfs_smb_statfs2(ssp, sbp, &scred);
           else
                   error = smbfs_smb_statfs(ssp, sbp, &scred);
           if (error)
                   return error;
           sbp->f_flags = 0;               /* copy of mount exported flags */
           return 0;
   }

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