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 "opt_netsmb.h"
    #ifndef NETSMB
    #error "SMBFS requires option NETSMB"
    #endif
    
    #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 <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>
    
    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_omount_t     smbfs_omount;
    static vfs_start_t      smbfs_start;
    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_omount =           smbfs_omount,
            .vfs_quotactl =         smbfs_quotactl,
            .vfs_root =             smbfs_root,
            .vfs_start =            smbfs_start,
            .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_omount(struct mount *mp, char *path, caddr_t data, struct thread *td)
   {
           struct smbfs_args args;           /* will hold data from mount request */
           struct smbmount *smp = NULL;
           struct smb_vc *vcp;
           struct smb_share *ssp = NULL;
           struct vnode *vp;
           struct smb_cred scred;
           int error;
           char *pc, *pe;
   
           if (data == NULL) {
                   printf("missing data argument\n");
                   return EINVAL;
           }
           if (mp->mnt_flag & MNT_UPDATE) {
                   printf("MNT_UPDATE not implemented");
                   return EOPNOTSUPP;
           }
           error = copyin(data, (caddr_t)&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;
           }
           smb_makescred(&scred, td, td->td_ucred);
           error = smb_dev2share(args.dev, SMBM_EXEC, &scred, &ssp);
           if (error) {
                   printf("invalid device handle %d (%d)\n", args.dev, 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");
                   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;
           lockinit(&smp->sm_hashlock, PVFS, "smbfsh", 0, 0);
           smp->sm_share = ssp;
           smp->sm_root = NULL;
           smp->sm_args = args;
           smp->sm_caseopt = args.caseopt;
           smp->sm_args.file_mode = (smp->sm_args.file_mode &
                               (S_IRWXU|S_IRWXG|S_IRWXO)) | S_IFREG;
           smp->sm_args.dir_mode  = (smp->sm_args.dir_mode &
                               (S_IRWXU|S_IRWXG|S_IRWXO)) | S_IFDIR;
   
   /*      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);
                   }
           }
           /* protect against invalid mount points */
           smp->sm_args.mount_point[sizeof(smp->sm_args.mount_point) - 1] = '\0';
           vfs_getnewfsid(mp);
           error = smbfs_root(mp, &vp, td);
           if (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);
                   lockdestroy(&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);
           smb_share_put(smp->sm_share, &scred);
           mp->mnt_data = (qaddr_t)0;
   
           if (smp->sm_hash)
                   free(smp->sm_hash, M_SMBFSHASH);
           lockdestroy(&smp->sm_hashlock);
   #ifdef SMBFS_USEZONE
           zfree(smbfsmount_zone, smp);
   #else
           free(smp, M_SMBFSDATA);
   #endif
           mp->mnt_flag &= ~MNT_LOCAL;
           return error;
   }
   
   /* 
    * Return locked root vnode of a filesystem
    */
   static int
   smbfs_root(struct mount *mp, 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");
                   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;
   }
   
   /*
    * Vfs start routine, a no-op.
    */
   /* ARGSUSED */
   static int
   smbfs_start(mp, flags, td)
           struct mount *mp;
           int flags;
           struct thread *td;
   {
           SMBVDEBUG("flags=%04x\n", flags);
           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;
           caddr_t 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)
                   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 */
           if (sbp != &mp->mnt_stat) {
                   sbp->f_fsid = mp->mnt_stat.f_fsid;      /* filesystem id */
                   sbp->f_owner = mp->mnt_stat.f_owner;    /* user that mounted the filesystem */
                   sbp->f_type = mp->mnt_vfc->vfc_typenum; /* type of filesystem */
                   bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN);
                   bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
           }
           strncpy(sbp->f_fstypename, mp->mnt_vfc->vfc_name, MFSNAMELEN);
           return 0;
   }

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