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/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>
    
    #include <sys/buf.h>
    
    int smbfs_debuglevel = 0;
    
    static int smbfs_version = SMBFS_VERSION;
    
    #ifdef SMBFS_USEZONE
    #include <vm/vm.h>
    #include <vm/vm_extern.h>
    #include <vm/vm_zone.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 int smbfs_mount(struct mount *, char *, caddr_t,
                            struct nameidata *, struct proc *);
    static int smbfs_quotactl(struct mount *, int, uid_t, caddr_t, struct proc *);
    static int smbfs_root(struct mount *, struct vnode **);
    static int smbfs_start(struct mount *, int, struct proc *);
    static int smbfs_statfs(struct mount *, struct statfs *, struct proc *);
    static int smbfs_sync(struct mount *, int, struct ucred *, struct proc *);
    static int smbfs_unmount(struct mount *, int, struct proc *);
    static int smbfs_init(struct vfsconf *vfsp);
    static int smbfs_uninit(struct vfsconf *vfsp);
    
    #if __FreeBSD_version < 400009
    static int smbfs_vget(struct mount *mp, ino_t ino, struct vnode **vpp);
    static int smbfs_fhtovp(struct mount *, struct fid *,
                            struct sockaddr *, struct vnode **, int *,
                            struct ucred **);
    static int smbfs_vptofh(struct vnode *, struct fid *);
    #endif
    
   static struct vfsops smbfs_vfsops = {
           smbfs_mount,
           smbfs_start,
           smbfs_unmount,
           smbfs_root,
           smbfs_quotactl,
           smbfs_statfs,
           smbfs_sync,
   #if __FreeBSD_version > 400008
           vfs_stdvget,
           vfs_stdfhtovp,          /* shouldn't happen */
           vfs_stdcheckexp,
           vfs_stdvptofh,          /* shouldn't happen */
   #else
           smbfs_vget,
           smbfs_fhtovp,
           smbfs_vptofh,
   #endif
           smbfs_init,
           smbfs_uninit,
           vfs_stdextattrctl
   };
   
   
   VFS_SET(smbfs_vfsops, smbfs, VFCF_NETWORK);
   
   MODULE_DEPEND(smbfs, netsmb, NSMB_VERSION, NSMB_VERSION, NSMB_VERSION);
   MODULE_DEPEND(smbfs, libiconv, 1, 1, 1);
   MODULE_DEPEND(smbfs, libmchain, 1, 1, 1);
   
   int smbfs_pbuf_freecnt = -1;    /* start out unlimited */
   
   static int
   smbfs_mount(struct mount *mp, char *path, caddr_t data, 
           struct nameidata *ndp, struct proc *p)
   {
           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;
           size_t size;
           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, p, p->p_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, p);
           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_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);*/
           error = copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size);
           if (error)
                   goto bad;
           bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size);
           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);
           if (error)
                   goto bad;
           VOP_UNLOCK(vp, 0, p);
           SMBVDEBUG("root.v_usecount = %d\n", vp->v_usecount);
   
   #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 proc *p)
   {
           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);
           } while (error == EBUSY && smp->sm_didrele != 0);
           if (error)
                   return error;
           smb_makescred(&scred, p, p->p_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 smbmount *smp = VFSTOSMBFS(mp);
           struct vnode *vp;
           struct smbnode *np;
           struct smbfattr fattr;
           struct proc *p = curproc;
           struct ucred *cred = p->p_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, p);
           }
           smb_makescred(&scred, p, 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;
           vp->v_flag |= VROOT;
           np = VTOSMB(vp);
           smp->sm_root = np;
           *vpp = vp;
           return 0;
   }
   
   /*
    * Vfs start routine, a no-op.
    */
   /* ARGSUSED */
   static int
   smbfs_start(mp, flags, p)
           struct mount *mp;
           int flags;
           struct proc *p;
   {
           SMBVDEBUG("flags=%04x\n", flags);
           return 0;
   }
   
   /*
    * Do operations associated with quotas, not supported
    */
   /* ARGSUSED */
   static int
   smbfs_quotactl(mp, cmd, uid, arg, p)
           struct mount *mp;
           int cmd;
           uid_t uid;
           caddr_t arg;
           struct proc *p;
   {
           SMBVDEBUG("return EOPNOTSUPP\n");
           return EOPNOTSUPP;
   }
   
   /*ARGSUSED*/
   int
   smbfs_init(struct vfsconf *vfsp)
   {
           smb_checksmp();
   
   #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 proc *p)
   {
           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 */
           sbp->f_spare2 = 0;                      /* placeholder */
           smb_makescred(&scred, p, p->p_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;
   }
   
   /*
    * Flush out the buffer cache
    */
   /* ARGSUSED */
   static int
   smbfs_sync(mp, waitfor, cred, p)
           struct mount *mp;
           int waitfor;
           struct ucred *cred;
           struct proc *p;
   {
           struct vnode *vp;
           int error, allerror = 0;
           /*
            * Force stale buffer cache information to be flushed.
            */
   loop:
           for (vp = TAILQ_FIRST(&mp->mnt_nvnodelist);
                vp != NULL;
                vp = TAILQ_NEXT(vp, v_nmntvnodes)) {
                   /*
                    * If the vnode that we are about to sync is no longer
                    * associated with this mount point, start over.
                    */
                   if (vp->v_mount != mp)
                           goto loop;
                   if (VOP_ISLOCKED(vp, NULL) || TAILQ_EMPTY(&vp->v_dirtyblkhd) ||
                       waitfor == MNT_LAZY)
                           continue;
                   if (vget(vp, LK_EXCLUSIVE, p))
                           goto loop;
                   error = VOP_FSYNC(vp, cred, waitfor, p);
                   if (error)
                           allerror = error;
                   vput(vp);
           }
           return (allerror);
   }
   
   #if __FreeBSD_version < 400009
   /*
    * smbfs flat namespace lookup. Unsupported.
    */
   /* ARGSUSED */
   static int smbfs_vget(mp, ino, vpp)
           struct mount *mp;
           ino_t ino;
           struct vnode **vpp;
   {
           return (EOPNOTSUPP);
   }
   
   /* ARGSUSED */
   static int smbfs_fhtovp(mp, fhp, nam, vpp, exflagsp, credanonp)
           struct mount *mp;
           struct fid *fhp;
           struct sockaddr *nam;
           struct vnode **vpp;
           int *exflagsp;
           struct ucred **credanonp;
   {
           return (EINVAL);
   }
   
   /*
    * Vnode pointer to File handle, should never happen either
    */
   /* ARGSUSED */
   static int
   smbfs_vptofh(vp, fhp)
           struct vnode *vp;
           struct fid *fhp;
   {
           return (EINVAL);
   }
   
   #endif /* __FreeBSD_version < 400009 */

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