smbfs_node.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  * 3. All advertising materials mentioning features or use of this software
   14  *    must display the following acknowledgement:
   15  *    This product includes software developed by Boris Popov.
   16  * 4. Neither the name of the author nor the names of any co-contributors
   17  *    may be used to endorse or promote products derived from this software
   18  *    without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  *
   32  * $FreeBSD: releng/5.0/sys/fs/smbfs/smbfs_node.c 105077 2002-10-14 03:20:36Z mckusick $
   33  */
   34 #include <sys/param.h>
   35 #include <sys/systm.h>
   36 #include <sys/kernel.h>
   37 #include <sys/lock.h>
   38 #include <sys/malloc.h>
   39 #include <sys/mount.h>
   40 #include <sys/proc.h>
   41 #include <sys/queue.h>
   42 #include <sys/sysctl.h>
   43 #include <sys/time.h>
   44 #include <sys/vnode.h>
   45 
   46 #include <netsmb/smb.h>
   47 #include <netsmb/smb_conn.h>
   48 #include <netsmb/smb_subr.h>
   49 
   50 #include <vm/vm.h>
   51 #include <vm/vm_extern.h>
   52 /*#include <vm/vm_page.h>
   53 #include <vm/vm_object.h>*/
   54 
   55 #include <fs/smbfs/smbfs.h>
   56 #include <fs/smbfs/smbfs_node.h>
   57 #include <fs/smbfs/smbfs_subr.h>
   58 
   59 #define SMBFS_NOHASH(smp, hval) (&(smp)->sm_hash[(hval) & (smp)->sm_hashlen])
   60 #define smbfs_hash_lock(smp, td)        lockmgr(&smp->sm_hashlock, LK_EXCLUSIVE, NULL, td)
   61 #define smbfs_hash_unlock(smp, td)      lockmgr(&smp->sm_hashlock, LK_RELEASE, NULL, td)
   62 
   63 
   64 extern vop_t **smbfs_vnodeop_p;
   65 
   66 MALLOC_DEFINE(M_SMBNODE, "SMBFS node", "SMBFS vnode private part");
   67 static MALLOC_DEFINE(M_SMBNODENAME, "SMBFS nname", "SMBFS node name");
   68 
   69 int smbfs_hashprint(struct mount *mp);
   70 
   71 #if 0
   72 #ifdef SYSCTL_DECL
   73 SYSCTL_DECL(_vfs_smbfs);
   74 #endif
   75 SYSCTL_PROC(_vfs_smbfs, OID_AUTO, vnprint, CTLFLAG_WR|CTLTYPE_OPAQUE,
   76             NULL, 0, smbfs_hashprint, "S,vnlist", "vnode hash");
   77 #endif
   78 
   79 #define FNV_32_PRIME ((u_int32_t) 0x01000193UL)
   80 #define FNV1_32_INIT ((u_int32_t) 33554467UL)
   81 
   82 u_int32_t
   83 smbfs_hash(const u_char *name, int nmlen)
   84 {
   85         u_int32_t v;
   86 
   87         for (v = FNV1_32_INIT; nmlen; name++, nmlen--) {
   88                 v *= FNV_32_PRIME;
   89                 v ^= (u_int32_t)*name;
   90         }
   91         return v;
   92 }
   93 
   94 int
   95 smbfs_hashprint(struct mount *mp)
   96 {
   97         struct smbmount *smp = VFSTOSMBFS(mp);
   98         struct smbnode_hashhead *nhpp;
   99         struct smbnode *np;
  100         int i;
  101 
  102         for(i = 0; i <= smp->sm_hashlen; i++) {
  103                 nhpp = &smp->sm_hash[i];
  104                 LIST_FOREACH(np, nhpp, n_hash)
  105                         vprint(NULL, SMBTOV(np));
  106         }
  107         return 0;
  108 }
  109 
  110 static char *
  111 smbfs_name_alloc(const u_char *name, int nmlen)
  112 {
  113         u_char *cp;
  114 
  115         nmlen++;
  116 #ifdef SMBFS_NAME_DEBUG
  117         cp = malloc(nmlen + 2 + sizeof(int), M_SMBNODENAME, M_WAITOK);
  118         *(int*)cp = nmlen;
  119         cp += sizeof(int);
  120         cp[0] = 0xfc;
  121         cp++;
  122         bcopy(name, cp, nmlen - 1);
  123         cp[nmlen] = 0xfe;
  124 #else
  125         cp = malloc(nmlen, M_SMBNODENAME, M_WAITOK);
  126         bcopy(name, cp, nmlen - 1);
  127 #endif
  128         cp[nmlen - 1] = 0;
  129         return cp;
  130 }
  131 
  132 static void
  133 smbfs_name_free(u_char *name)
  134 {
  135 #ifdef SMBFS_NAME_DEBUG
  136         int nmlen, slen;
  137         u_char *cp;
  138 
  139         cp = name;
  140         cp--;
  141         if (*cp != 0xfc) {
  142                 printf("First byte of name entry '%s' corrupted\n", name);
  143                 Debugger("ditto");
  144         }
  145         cp -= sizeof(int);
  146         nmlen = *(int*)cp;
  147         slen = strlen(name) + 1;
  148         if (nmlen != slen) {
  149                 printf("Name length mismatch: was %d, now %d name '%s'\n",
  150                     nmlen, slen, name);
  151                 Debugger("ditto");
  152         }
  153         if (name[nmlen] != 0xfe) {
  154                 printf("Last byte of name entry '%s' corrupted\n", name);
  155                 Debugger("ditto");
  156         }
  157         free(cp, M_SMBNODENAME);
  158 #else
  159         free(name, M_SMBNODENAME);
  160 #endif
  161 }
  162 
  163 static int
  164 smbfs_node_alloc(struct mount *mp, struct vnode *dvp,
  165         const char *name, int nmlen, struct smbfattr *fap, struct vnode **vpp)
  166 {
  167         struct thread *td = curthread;  /* XXX */
  168         struct smbmount *smp = VFSTOSMBFS(mp);
  169         struct smbnode_hashhead *nhpp;
  170         struct smbnode *np, *np2, *dnp;
  171         struct vnode *vp;
  172         u_long hashval;
  173         int error;
  174 
  175         *vpp = NULL;
  176         if (smp->sm_root != NULL && dvp == NULL) {
  177                 SMBERROR("do not allocate root vnode twice!\n");
  178                 return EINVAL;
  179         }
  180         if (nmlen == 2 && bcmp(name, "..", 2) == 0) {
  181                 if (dvp == NULL)
  182                         return EINVAL;
  183                 vp = VTOSMB(dvp)->n_parent->n_vnode;
  184                 error = vget(vp, LK_EXCLUSIVE, td);
  185                 if (error == 0)
  186                         *vpp = vp;
  187                 return error;
  188         } else if (nmlen == 1 && name[0] == '.') {
  189                 SMBERROR("do not call me with dot!\n");
  190                 return EINVAL;
  191         }
  192         dnp = dvp ? VTOSMB(dvp) : NULL;
  193         if (dnp == NULL && dvp != NULL) {
  194                 vprint("smbfs_node_alloc: dead parent vnode", dvp);
  195                 return EINVAL;
  196         }
  197         hashval = smbfs_hash(name, nmlen);
  198 retry:
  199         smbfs_hash_lock(smp, td);
  200 loop:
  201         nhpp = SMBFS_NOHASH(smp, hashval);
  202         LIST_FOREACH(np, nhpp, n_hash) {
  203                 vp = SMBTOV(np);
  204                 if (np->n_parent != dnp ||
  205                     np->n_nmlen != nmlen || bcmp(name, np->n_name, nmlen) != 0)
  206                         continue;
  207                 VI_LOCK(vp);
  208                 smbfs_hash_unlock(smp, td);
  209                 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, td) != 0)
  210                         goto retry;
  211                 *vpp = vp;
  212                 return 0;
  213         }
  214         smbfs_hash_unlock(smp, td);
  215         /*
  216          * If we don't have node attributes, then it is an explicit lookup
  217          * for an existing vnode.
  218          */
  219         if (fap == NULL)
  220                 return ENOENT;
  221 
  222         MALLOC(np, struct smbnode *, sizeof *np, M_SMBNODE, M_WAITOK);
  223         error = getnewvnode("smbfs", mp, smbfs_vnodeop_p, &vp);
  224         if (error) {
  225                 FREE(np, M_SMBNODE);
  226                 return error;
  227         }
  228         vp->v_type = fap->fa_attr & SMB_FA_DIR ? VDIR : VREG;
  229         bzero(np, sizeof(*np));
  230         vp->v_data = np;
  231         np->n_vnode = vp;
  232         np->n_mount = VFSTOSMBFS(mp);
  233         np->n_nmlen = nmlen;
  234         np->n_name = smbfs_name_alloc(name, nmlen);
  235         np->n_ino = fap->fa_ino;
  236 
  237         if (dvp) {
  238                 ASSERT_VOP_LOCKED(dvp, "smbfs_node_alloc");
  239                 np->n_parent = dnp;
  240                 if (/*vp->v_type == VDIR &&*/ (dvp->v_vflag & VV_ROOT) == 0) {
  241                         vref(dvp);
  242                         np->n_flag |= NREFPARENT;
  243                 }
  244         } else if (vp->v_type == VREG)
  245                 SMBERROR("new vnode '%s' born without parent ?\n", np->n_name);
  246 
  247         vp->v_vnlock->lk_flags |= LK_CANRECURSE;
  248         vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
  249 
  250         smbfs_hash_lock(smp, td);
  251         LIST_FOREACH(np2, nhpp, n_hash) {
  252                 if (np2->n_parent != dnp ||
  253                     np2->n_nmlen != nmlen || bcmp(name, np2->n_name, nmlen) != 0)
  254                         continue;
  255                 vput(vp);
  256 /*              smb_name_free(np->n_name);
  257                 FREE(np, M_SMBNODE);*/
  258                 goto loop;
  259         }
  260         LIST_INSERT_HEAD(nhpp, np, n_hash);
  261         smbfs_hash_unlock(smp, td);
  262         *vpp = vp;
  263         return 0;
  264 }
  265 
  266 int
  267 smbfs_nget(struct mount *mp, struct vnode *dvp, const char *name, int nmlen,
  268         struct smbfattr *fap, struct vnode **vpp)
  269 {
  270         struct smbnode *np;
  271         struct vnode *vp;
  272         int error;
  273 
  274         *vpp = NULL;
  275         error = smbfs_node_alloc(mp, dvp, name, nmlen, fap, &vp);
  276         if (error)
  277                 return error;
  278         np = VTOSMB(vp);
  279         if (fap)
  280                 smbfs_attr_cacheenter(vp, fap);
  281         *vpp = vp;
  282         return 0;
  283 }
  284 
  285 /*
  286  * Free smbnode, and give vnode back to system
  287  */
  288 int
  289 smbfs_reclaim(ap)                     
  290         struct vop_reclaim_args /* {
  291                 struct vnode *a_vp;
  292                 struct thread *a_p;
  293         } */ *ap;
  294 {
  295         struct vnode *vp = ap->a_vp;
  296         struct thread *td = ap->a_td;
  297         struct vnode *dvp;
  298         struct smbnode *np = VTOSMB(vp);
  299         struct smbmount *smp = VTOSMBFS(vp);
  300         
  301         SMBVDEBUG("%s,%d\n", np->n_name, vrefcnt(vp));
  302 
  303         smbfs_hash_lock(smp, td);
  304 
  305         dvp = (np->n_parent && (np->n_flag & NREFPARENT)) ?
  306             np->n_parent->n_vnode : NULL;
  307 
  308         if (np->n_hash.le_prev)
  309                 LIST_REMOVE(np, n_hash);
  310         cache_purge(vp);
  311         if (smp->sm_root == np) {
  312                 SMBVDEBUG("root vnode\n");
  313                 smp->sm_root = NULL;
  314         }
  315         vp->v_data = NULL;
  316         smbfs_hash_unlock(smp, td);
  317         if (np->n_name)
  318                 smbfs_name_free(np->n_name);
  319         FREE(np, M_SMBNODE);
  320         if (dvp) {
  321                 VI_LOCK(dvp);
  322                 if (dvp->v_usecount >= 1) {
  323                         VI_UNLOCK(dvp);
  324                         vrele(dvp);
  325                 } else {
  326                         VI_UNLOCK(dvp);
  327                         SMBERROR("BUG: negative use count for parent!\n");
  328                 }
  329         }
  330         return 0;
  331 }
  332 
  333 int
  334 smbfs_inactive(ap)
  335         struct vop_inactive_args /* {
  336                 struct vnode *a_vp;
  337                 struct thread *a_td;
  338         } */ *ap;
  339 {
  340         struct thread *td = ap->a_td;
  341         struct ucred *cred = td->td_ucred;
  342         struct vnode *vp = ap->a_vp;
  343         struct smbnode *np = VTOSMB(vp);
  344         struct smb_cred scred;
  345         int error;
  346 
  347         SMBVDEBUG("%s: %d\n", VTOSMB(vp)->n_name, vrefcnt(vp));
  348         if (np->n_opencount) {
  349                 error = smbfs_vinvalbuf(vp, V_SAVE, cred, td, 1);
  350                 smb_makescred(&scred, td, cred);
  351                 error = smbfs_smb_close(np->n_mount->sm_share, np->n_fid, 
  352                    &np->n_mtime, &scred);
  353                 np->n_opencount = 0;
  354         }
  355         VOP_UNLOCK(vp, 0, td);
  356         return (0);
  357 }
  358 /*
  359  * routines to maintain vnode attributes cache
  360  * smbfs_attr_cacheenter: unpack np.i to vattr structure
  361  */
  362 void
  363 smbfs_attr_cacheenter(struct vnode *vp, struct smbfattr *fap)
  364 {
  365         struct smbnode *np = VTOSMB(vp);
  366 
  367         if (vp->v_type == VREG) {
  368                 if (np->n_size != fap->fa_size) {
  369                         np->n_size = fap->fa_size;
  370                         vnode_pager_setsize(vp, np->n_size);
  371                 }
  372         } else if (vp->v_type == VDIR) {
  373                 np->n_size = 16384;             /* should be a better way ... */
  374         } else
  375                 return;
  376         np->n_mtime = fap->fa_mtime;
  377         np->n_dosattr = fap->fa_attr;
  378         np->n_attrage = time_second;
  379         return;
  380 }
  381 
  382 int
  383 smbfs_attr_cachelookup(struct vnode *vp, struct vattr *va)
  384 {
  385         struct smbnode *np = VTOSMB(vp);
  386         struct smbmount *smp = VTOSMBFS(vp);
  387         int diff;
  388 
  389         diff = time_second - np->n_attrage;
  390         if (diff > 2)   /* XXX should be configurable */
  391                 return ENOENT;
  392         va->va_type = vp->v_type;               /* vnode type (for create) */
  393         if (vp->v_type == VREG) {
  394                 va->va_mode = smp->sm_args.file_mode;   /* files access mode and type */
  395         } else if (vp->v_type == VDIR) {
  396                 va->va_mode = smp->sm_args.dir_mode;    /* files access mode and type */
  397         } else
  398                 return EINVAL;
  399         va->va_size = np->n_size;
  400         va->va_nlink = 1;               /* number of references to file */
  401         va->va_uid = smp->sm_args.uid;  /* owner user id */
  402         va->va_gid = smp->sm_args.gid;  /* owner group id */
  403         va->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0];
  404         va->va_fileid = np->n_ino;      /* file id */
  405         if (va->va_fileid == 0)
  406                 va->va_fileid = 2;
  407         va->va_blocksize = SSTOVC(smp->sm_share)->vc_txmax;
  408         va->va_mtime = np->n_mtime;
  409         va->va_atime = va->va_ctime = va->va_mtime;     /* time file changed */
  410         va->va_gen = VNOVAL;            /* generation number of file */
  411         va->va_flags = 0;               /* flags defined for file */
  412         va->va_rdev = VNOVAL;           /* device the special file represents */
  413         va->va_bytes = va->va_size;     /* bytes of disk space held by file */
  414         va->va_filerev = 0;             /* file modification number */
  415         va->va_vaflags = 0;             /* operations flags */
  416         return 0;
  417 }
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FreeBSD/Linux Kernel Cross Reference sys/fs/smbfs/smbfs_node.c

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