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_node.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2000-2001 Boris Popov
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  *
   28  * $FreeBSD$
   29  */
   30 #include <sys/param.h>
   31 #include <sys/systm.h>
   32 #include <sys/fnv_hash.h>
   33 #include <sys/kernel.h>
   34 #include <sys/lock.h>
   35 #include <sys/malloc.h>
   36 #include <sys/mount.h>
   37 #include <sys/proc.h>
   38 #include <sys/queue.h>
   39 #include <sys/stat.h>
   40 #include <sys/sx.h>
   41 #include <sys/sysctl.h>
   42 #include <sys/time.h>
   43 #include <sys/vnode.h>
   44 
   45 #include <netsmb/smb.h>
   46 #include <netsmb/smb_conn.h>
   47 #include <netsmb/smb_subr.h>
   48 
   49 #include <vm/vm.h>
   50 #include <vm/vm_extern.h>
   51 /*#include <vm/vm_page.h>
   52 #include <vm/vm_object.h>*/
   53 
   54 #include <fs/smbfs/smbfs.h>
   55 #include <fs/smbfs/smbfs_node.h>
   56 #include <fs/smbfs/smbfs_subr.h>
   57 
   58 extern struct vop_vector smbfs_vnodeops;        /* XXX -> .h file */
   59 
   60 static MALLOC_DEFINE(M_SMBNODE, "smbufs_node", "SMBFS vnode private part");
   61 static MALLOC_DEFINE(M_SMBNODENAME, "smbufs_nname", "SMBFS node name");
   62 
   63 u_int32_t __inline
   64 smbfs_hash(const u_char *name, int nmlen)
   65 {
   66         return (fnv_32_buf(name, nmlen, FNV1_32_INIT)); 
   67 }
   68 
   69 static char *
   70 smbfs_name_alloc(const u_char *name, int nmlen)
   71 {
   72         u_char *cp;
   73 
   74         nmlen++;
   75         cp = malloc(nmlen, M_SMBNODENAME, M_WAITOK);
   76         bcopy(name, cp, nmlen - 1);
   77         cp[nmlen - 1] = 0;
   78         return cp;
   79 }
   80 
   81 static void
   82 smbfs_name_free(u_char *name)
   83 {
   84 
   85         free(name, M_SMBNODENAME);
   86 }
   87 
   88 static int __inline
   89 smbfs_vnode_cmp(struct vnode *vp, void *_sc) 
   90 {
   91         struct smbnode *np;
   92         struct smbcmp *sc;
   93 
   94         np = (struct smbnode *) vp->v_data;
   95         sc = (struct smbcmp *) _sc;
   96         if (np->n_parent != sc->n_parent || np->n_nmlen != sc->n_nmlen ||
   97             bcmp(sc->n_name, np->n_name, sc->n_nmlen) != 0)
   98                 return 1;
   99         return 0;
  100 }
  101 
  102 static int
  103 smbfs_node_alloc(struct mount *mp, struct vnode *dvp, const char *dirnm, 
  104         int dirlen, const char *name, int nmlen, char sep, 
  105         struct smbfattr *fap, struct vnode **vpp)
  106 {
  107         struct vattr vattr;
  108         struct thread *td = curthread;  /* XXX */
  109         struct smbmount *smp = VFSTOSMBFS(mp);
  110         struct smbnode *np, *dnp;
  111         struct vnode *vp, *vp2;
  112         struct smbcmp sc;
  113         char *p, *rpath;
  114         int error, rplen;
  115 
  116         sc.n_parent = dvp;
  117         sc.n_nmlen = nmlen;
  118         sc.n_name = name;       
  119         if (smp->sm_root != NULL && dvp == NULL) {
  120                 SMBERROR("do not allocate root vnode twice!\n");
  121                 return EINVAL;
  122         }
  123         if (nmlen == 2 && bcmp(name, "..", 2) == 0) {
  124                 if (dvp == NULL)
  125                         return EINVAL;
  126                 vp = VTOSMB(VTOSMB(dvp)->n_parent)->n_vnode;
  127                 error = vget(vp, LK_EXCLUSIVE, td);
  128                 if (error == 0)
  129                         *vpp = vp;
  130                 return error;
  131         } else if (nmlen == 1 && name[0] == '.') {
  132                 SMBERROR("do not call me with dot!\n");
  133                 return EINVAL;
  134         }
  135         dnp = dvp ? VTOSMB(dvp) : NULL;
  136         if (dnp == NULL && dvp != NULL) {
  137                 vn_printf(dvp, "smbfs_node_alloc: dead parent vnode ");
  138                 return EINVAL;
  139         }
  140         error = vfs_hash_get(mp, smbfs_hash(name, nmlen), LK_EXCLUSIVE, td,
  141             vpp, smbfs_vnode_cmp, &sc);
  142         if (error)
  143                 return (error);
  144         if (*vpp) {
  145                 np = VTOSMB(*vpp);
  146                 /* Force cached attributes to be refreshed if stale. */
  147                 (void)VOP_GETATTR(*vpp, &vattr, td->td_ucred);
  148                 /*
  149                  * If the file type on the server is inconsistent with
  150                  * what it was when we created the vnode, kill the
  151                  * bogus vnode now and fall through to the code below
  152                  * to create a new one with the right type.
  153                  */
  154                 if (((*vpp)->v_type == VDIR && 
  155                     (np->n_dosattr & SMB_FA_DIR) == 0) ||
  156                     ((*vpp)->v_type == VREG && 
  157                     (np->n_dosattr & SMB_FA_DIR) != 0)) {
  158                         vgone(*vpp);
  159                         vput(*vpp);
  160                 }
  161                 else {
  162                         SMBVDEBUG("vnode taken from the hashtable\n");
  163                         return (0);
  164                 }
  165         }
  166         /*
  167          * If we don't have node attributes, then it is an explicit lookup
  168          * for an existing vnode.
  169          */
  170         if (fap == NULL)
  171                 return ENOENT;
  172 
  173         error = getnewvnode("smbfs", mp, &smbfs_vnodeops, vpp);
  174         if (error)
  175                 return (error);
  176         vp = *vpp;
  177         np = malloc(sizeof *np, M_SMBNODE, M_WAITOK | M_ZERO);
  178         rplen = dirlen;
  179         if (sep != '\0')
  180                 rplen++;
  181         rplen += nmlen;
  182         rpath = malloc(rplen + 1, M_SMBNODENAME, M_WAITOK);
  183         p = rpath;
  184         bcopy(dirnm, p, dirlen);
  185         p += dirlen;
  186         if (sep != '\0')
  187                 *p++ = sep;
  188         if (name != NULL) {
  189                 bcopy(name, p, nmlen);
  190                 p += nmlen;
  191         }
  192         *p = '\0';
  193         MPASS(p == rpath + rplen);
  194         lockmgr(vp->v_vnlock, LK_EXCLUSIVE, NULL);
  195         /* Vnode initialization */
  196         vp->v_type = fap->fa_attr & SMB_FA_DIR ? VDIR : VREG;
  197         vp->v_data = np;
  198         np->n_vnode = vp;
  199         np->n_mount = VFSTOSMBFS(mp);
  200         np->n_rpath = rpath;
  201         np->n_rplen = rplen;
  202         np->n_nmlen = nmlen;
  203         np->n_name = smbfs_name_alloc(name, nmlen);
  204         np->n_ino = fap->fa_ino;
  205         if (dvp) {
  206                 ASSERT_VOP_LOCKED(dvp, "smbfs_node_alloc");
  207                 np->n_parent = dvp;
  208                 np->n_parentino = VTOSMB(dvp)->n_ino;
  209                 if (/*vp->v_type == VDIR &&*/ (dvp->v_vflag & VV_ROOT) == 0) {
  210                         vref(dvp);
  211                         np->n_flag |= NREFPARENT;
  212                 }
  213         } else if (vp->v_type == VREG)
  214                 SMBERROR("new vnode '%s' born without parent ?\n", np->n_name);
  215         error = insmntque(vp, mp);
  216         if (error) {
  217                 free(np, M_SMBNODE);
  218                 return (error);
  219         }
  220         error = vfs_hash_insert(vp, smbfs_hash(name, nmlen), LK_EXCLUSIVE,
  221             td, &vp2, smbfs_vnode_cmp, &sc);
  222         if (error) 
  223                 return (error);
  224         if (vp2 != NULL)
  225                 *vpp = vp2;
  226         return (0);
  227 }
  228 
  229 int
  230 smbfs_nget(struct mount *mp, struct vnode *dvp, const char *name, int nmlen,
  231         struct smbfattr *fap, struct vnode **vpp)
  232 {
  233         struct smbnode *dnp, *np;
  234         struct vnode *vp;
  235         int error, sep;
  236 
  237         dnp = (dvp) ? VTOSMB(dvp) : NULL;
  238         sep = 0;
  239         if (dnp != NULL) {
  240                 sep = SMBFS_DNP_SEP(dnp); 
  241                 error = smbfs_node_alloc(mp, dvp, dnp->n_rpath, dnp->n_rplen, 
  242                     name, nmlen, sep, fap, &vp); 
  243         } else
  244                 error = smbfs_node_alloc(mp, NULL, "\\", 1, name, nmlen, 
  245                     sep, fap, &vp); 
  246         if (error)
  247                 return error;
  248         MPASS(vp != NULL);
  249         np = VTOSMB(vp);
  250         if (fap)
  251                 smbfs_attr_cacheenter(vp, fap);
  252         *vpp = vp;
  253         return 0;
  254 }
  255 
  256 /*
  257  * Free smbnode, and give vnode back to system
  258  */
  259 int
  260 smbfs_reclaim(ap)                     
  261         struct vop_reclaim_args /* {
  262                 struct vnode *a_vp;
  263                 struct thread *a_p;
  264         } */ *ap;
  265 {
  266         struct vnode *vp = ap->a_vp;
  267         struct vnode *dvp;
  268         struct smbnode *np = VTOSMB(vp);
  269         struct smbmount *smp = VTOSMBFS(vp);
  270         
  271         SMBVDEBUG("%s,%d\n", np->n_name, vrefcnt(vp));
  272 
  273         KASSERT((np->n_flag & NOPEN) == 0, ("file not closed before reclaim"));
  274 
  275         /*
  276          * Destroy the vm object and flush associated pages.
  277          */
  278         vnode_destroy_vobject(vp);
  279         dvp = (np->n_parent && (np->n_flag & NREFPARENT)) ?
  280             np->n_parent : NULL;
  281         
  282         /*
  283          * Remove the vnode from its hash chain.
  284          */
  285         vfs_hash_remove(vp);
  286         if (np->n_name)
  287                 smbfs_name_free(np->n_name);
  288         if (np->n_rpath)
  289                 free(np->n_rpath, M_SMBNODENAME);
  290         free(np, M_SMBNODE);
  291         vp->v_data = NULL;
  292         if (dvp != NULL) {
  293                 vrele(dvp);
  294                 /*
  295                  * Indicate that we released something; see comment
  296                  * in smbfs_unmount().
  297                  */
  298                 smp->sm_didrele = 1;
  299         }
  300         return 0;
  301 }
  302 
  303 int
  304 smbfs_inactive(ap)
  305         struct vop_inactive_args /* {
  306                 struct vnode *a_vp;
  307                 struct thread *a_td;
  308         } */ *ap;
  309 {
  310         struct thread *td = ap->a_td;
  311         struct ucred *cred = td->td_ucred;
  312         struct vnode *vp = ap->a_vp;
  313         struct smbnode *np = VTOSMB(vp);
  314         struct smb_cred *scred;
  315         struct vattr va;
  316 
  317         SMBVDEBUG("%s: %d\n", VTOSMB(vp)->n_name, vrefcnt(vp));
  318         if ((np->n_flag & NOPEN) != 0) {
  319                 scred = smbfs_malloc_scred();
  320                 smb_makescred(scred, td, cred);
  321                 smbfs_vinvalbuf(vp, td);
  322                 if (vp->v_type == VREG) {
  323                         VOP_GETATTR(vp, &va, cred);
  324                         smbfs_smb_close(np->n_mount->sm_share, np->n_fid,
  325                             &np->n_mtime, scred);
  326                 } else if (vp->v_type == VDIR) {
  327                         if (np->n_dirseq != NULL) {
  328                                 smbfs_findclose(np->n_dirseq, scred);
  329                                 np->n_dirseq = NULL;
  330                         }
  331                 }
  332                 np->n_flag &= ~NOPEN;
  333                 smbfs_attr_cacheremove(vp);
  334                 smbfs_free_scred(scred);
  335         }
  336         if (np->n_flag & NGONE)
  337                 vrecycle(vp);
  338         return (0);
  339 }
  340 /*
  341  * routines to maintain vnode attributes cache
  342  * smbfs_attr_cacheenter: unpack np.i to vattr structure
  343  */
  344 void
  345 smbfs_attr_cacheenter(struct vnode *vp, struct smbfattr *fap)
  346 {
  347         struct smbnode *np = VTOSMB(vp);
  348 
  349         if (vp->v_type == VREG) {
  350                 if (np->n_size != fap->fa_size) {
  351                         np->n_size = fap->fa_size;
  352                         vnode_pager_setsize(vp, np->n_size);
  353                 }
  354         } else if (vp->v_type == VDIR) {
  355                 np->n_size = 16384;             /* should be a better way ... */
  356         } else
  357                 return;
  358         np->n_mtime = fap->fa_mtime;
  359         np->n_dosattr = fap->fa_attr;
  360         np->n_attrage = time_second;
  361         return;
  362 }
  363 
  364 int
  365 smbfs_attr_cachelookup(struct vnode *vp, struct vattr *va)
  366 {
  367         struct smbnode *np = VTOSMB(vp);
  368         struct smbmount *smp = VTOSMBFS(vp);
  369         int diff;
  370 
  371         diff = time_second - np->n_attrage;
  372         if (diff > 2)   /* XXX should be configurable */
  373                 return ENOENT;
  374         va->va_type = vp->v_type;               /* vnode type (for create) */
  375         va->va_flags = 0;                       /* flags defined for file */
  376         if (vp->v_type == VREG) {
  377                 va->va_mode = smp->sm_file_mode; /* files access mode and type */
  378                 if (np->n_dosattr & SMB_FA_RDONLY) {
  379                         va->va_mode &= ~(S_IWUSR|S_IWGRP|S_IWOTH);
  380                         va->va_flags |= UF_READONLY;
  381                 }
  382         } else if (vp->v_type == VDIR) {
  383                 va->va_mode = smp->sm_dir_mode; /* files access mode and type */
  384         } else
  385                 return EINVAL;
  386         va->va_size = np->n_size;
  387         va->va_nlink = 1;               /* number of references to file */
  388         va->va_uid = smp->sm_uid;       /* owner user id */
  389         va->va_gid = smp->sm_gid;       /* owner group id */
  390         va->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0];
  391         va->va_fileid = np->n_ino;      /* file id */
  392         if (va->va_fileid == 0)
  393                 va->va_fileid = 2;
  394         va->va_blocksize = SSTOVC(smp->sm_share)->vc_txmax;
  395         va->va_mtime = np->n_mtime;
  396         va->va_atime = va->va_ctime = va->va_mtime;     /* time file changed */
  397         va->va_gen = VNOVAL;            /* generation number of file */
  398         if (np->n_dosattr & SMB_FA_HIDDEN)
  399                 va->va_flags |= UF_HIDDEN;
  400         if (np->n_dosattr & SMB_FA_SYSTEM)
  401                 va->va_flags |= UF_SYSTEM;
  402         /*
  403          * We don't set the archive bit for directories.
  404          */
  405         if ((vp->v_type != VDIR) && (np->n_dosattr & SMB_FA_ARCHIVE))
  406                 va->va_flags |= UF_ARCHIVE;
  407         va->va_rdev = NODEV;            /* device the special file represents */
  408         va->va_bytes = va->va_size;     /* bytes of disk space held by file */
  409         va->va_filerev = 0;             /* file modification number */
  410         va->va_vaflags = 0;             /* operations flags */
  411         return 0;
  412 }

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