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  * 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/6.0/sys/fs/smbfs/smbfs_node.c 143513 2005-03-13 12:18:25Z jeff $
   33  */
   34 #include <sys/param.h>
   35 #include <sys/systm.h>
   36 #include <sys/kdb.h>
   37 #include <sys/kernel.h>
   38 #include <sys/lock.h>
   39 #include <sys/malloc.h>
   40 #include <sys/mount.h>
   41 #include <sys/proc.h>
   42 #include <sys/queue.h>
   43 #include <sys/sysctl.h>
   44 #include <sys/time.h>
   45 #include <sys/vnode.h>
   46 
   47 #include <netsmb/smb.h>
   48 #include <netsmb/smb_conn.h>
   49 #include <netsmb/smb_subr.h>
   50 
   51 #include <vm/vm.h>
   52 #include <vm/vm_extern.h>
   53 /*#include <vm/vm_page.h>
   54 #include <vm/vm_object.h>*/
   55 
   56 #include <fs/smbfs/smbfs.h>
   57 #include <fs/smbfs/smbfs_node.h>
   58 #include <fs/smbfs/smbfs_subr.h>
   59 
   60 #define SMBFS_NOHASH(smp, hval) (&(smp)->sm_hash[(hval) & (smp)->sm_hashlen])
   61 #define smbfs_hash_lock(smp, td)        lockmgr(&smp->sm_hashlock, LK_EXCLUSIVE, NULL, td)
   62 #define smbfs_hash_unlock(smp, td)      lockmgr(&smp->sm_hashlock, LK_RELEASE, NULL, td)
   63 
   64 
   65 extern struct vop_vector smbfs_vnodeops;        /* XXX -> .h file */
   66 
   67 MALLOC_DEFINE(M_SMBNODE, "SMBFS node", "SMBFS vnode private part");
   68 static MALLOC_DEFINE(M_SMBNODENAME, "SMBFS nname", "SMBFS node name");
   69 
   70 int smbfs_hashprint(struct mount *mp);
   71 
   72 #if 0
   73 #ifdef SYSCTL_DECL
   74 SYSCTL_DECL(_vfs_smbfs);
   75 #endif
   76 SYSCTL_PROC(_vfs_smbfs, OID_AUTO, vnprint, CTLFLAG_WR|CTLTYPE_OPAQUE,
   77             NULL, 0, smbfs_hashprint, "S,vnlist", "vnode hash");
   78 #endif
   79 
   80 #define FNV_32_PRIME ((u_int32_t) 0x01000193UL)
   81 #define FNV1_32_INIT ((u_int32_t) 33554467UL)
   82 
   83 u_int32_t
   84 smbfs_hash(const u_char *name, int nmlen)
   85 {
   86         u_int32_t v;
   87 
   88         for (v = FNV1_32_INIT; nmlen; name++, nmlen--) {
   89                 v *= FNV_32_PRIME;
   90                 v ^= (u_int32_t)*name;
   91         }
   92         return v;
   93 }
   94 
   95 int
   96 smbfs_hashprint(struct mount *mp)
   97 {
   98         struct smbmount *smp = VFSTOSMBFS(mp);
   99         struct smbnode_hashhead *nhpp;
  100         struct smbnode *np;
  101         int i;
  102 
  103         for(i = 0; i <= smp->sm_hashlen; i++) {
  104                 nhpp = &smp->sm_hash[i];
  105                 LIST_FOREACH(np, nhpp, n_hash)
  106                         vprint("", SMBTOV(np));
  107         }
  108         return 0;
  109 }
  110 
  111 static char *
  112 smbfs_name_alloc(const u_char *name, int nmlen)
  113 {
  114         u_char *cp;
  115 
  116         nmlen++;
  117 #ifdef SMBFS_NAME_DEBUG
  118         cp = malloc(nmlen + 2 + sizeof(int), M_SMBNODENAME, M_WAITOK);
  119         *(int*)cp = nmlen;
  120         cp += sizeof(int);
  121         cp[0] = 0xfc;
  122         cp++;
  123         bcopy(name, cp, nmlen - 1);
  124         cp[nmlen] = 0xfe;
  125 #else
  126         cp = malloc(nmlen, M_SMBNODENAME, M_WAITOK);
  127         bcopy(name, cp, nmlen - 1);
  128 #endif
  129         cp[nmlen - 1] = 0;
  130         return cp;
  131 }
  132 
  133 static void
  134 smbfs_name_free(u_char *name)
  135 {
  136 #ifdef SMBFS_NAME_DEBUG
  137         int nmlen, slen;
  138         u_char *cp;
  139 
  140         cp = name;
  141         cp--;
  142         if (*cp != 0xfc) {
  143                 printf("First byte of name entry '%s' corrupted\n", name);
  144                 kdb_enter("ditto");
  145         }
  146         cp -= sizeof(int);
  147         nmlen = *(int*)cp;
  148         slen = strlen(name) + 1;
  149         if (nmlen != slen) {
  150                 printf("Name length mismatch: was %d, now %d name '%s'\n",
  151                     nmlen, slen, name);
  152                 kdb_enter("ditto");
  153         }
  154         if (name[nmlen] != 0xfe) {
  155                 printf("Last byte of name entry '%s' corrupted\n", name);
  156                 kdb_enter("ditto");
  157         }
  158         free(cp, M_SMBNODENAME);
  159 #else
  160         free(name, M_SMBNODENAME);
  161 #endif
  162 }
  163 
  164 static int
  165 smbfs_node_alloc(struct mount *mp, struct vnode *dvp,
  166         const char *name, int nmlen, struct smbfattr *fap, struct vnode **vpp)
  167 {
  168         struct vattr vattr;
  169         struct thread *td = curthread;  /* XXX */
  170         struct smbmount *smp = VFSTOSMBFS(mp);
  171         struct smbnode_hashhead *nhpp;
  172         struct smbnode *np, *np2, *dnp;
  173         struct vnode *vp;
  174         u_long hashval;
  175         int error;
  176 
  177         *vpp = NULL;
  178         if (smp->sm_root != NULL && dvp == NULL) {
  179                 SMBERROR("do not allocate root vnode twice!\n");
  180                 return EINVAL;
  181         }
  182         if (nmlen == 2 && bcmp(name, "..", 2) == 0) {
  183                 if (dvp == NULL)
  184                         return EINVAL;
  185                 vp = VTOSMB(VTOSMB(dvp)->n_parent)->n_vnode;
  186                 error = vget(vp, LK_EXCLUSIVE, td);
  187                 if (error == 0)
  188                         *vpp = vp;
  189                 return error;
  190         } else if (nmlen == 1 && name[0] == '.') {
  191                 SMBERROR("do not call me with dot!\n");
  192                 return EINVAL;
  193         }
  194         dnp = dvp ? VTOSMB(dvp) : NULL;
  195         if (dnp == NULL && dvp != NULL) {
  196                 vprint("smbfs_node_alloc: dead parent vnode", dvp);
  197                 return EINVAL;
  198         }
  199         hashval = smbfs_hash(name, nmlen);
  200 retry:
  201         smbfs_hash_lock(smp, td);
  202 loop:
  203         nhpp = SMBFS_NOHASH(smp, hashval);
  204         LIST_FOREACH(np, nhpp, n_hash) {
  205                 vp = SMBTOV(np);
  206                 if (np->n_parent != dvp ||
  207                     np->n_nmlen != nmlen || bcmp(name, np->n_name, nmlen) != 0)
  208                         continue;
  209                 VI_LOCK(vp);
  210                 smbfs_hash_unlock(smp, td);
  211                 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, td) != 0)
  212                         goto retry;
  213                 /* Force cached attributes to be refreshed if stale. */
  214                 (void)VOP_GETATTR(vp, &vattr, td->td_ucred, td);
  215                 /*
  216                  * If the file type on the server is inconsistent with
  217                  * what it was when we created the vnode, kill the
  218                  * bogus vnode now and fall through to the code below
  219                  * to create a new one with the right type.
  220                  */
  221                 if ((vp->v_type == VDIR && (np->n_dosattr & SMB_FA_DIR) == 0) ||
  222                     (vp->v_type == VREG && (np->n_dosattr & SMB_FA_DIR) != 0)) {
  223                         vgone(vp);
  224                         vput(vp);
  225                         break;
  226                 }
  227                 *vpp = vp;
  228                 return 0;
  229         }
  230         smbfs_hash_unlock(smp, td);
  231         /*
  232          * If we don't have node attributes, then it is an explicit lookup
  233          * for an existing vnode.
  234          */
  235         if (fap == NULL)
  236                 return ENOENT;
  237 
  238         MALLOC(np, struct smbnode *, sizeof *np, M_SMBNODE, M_WAITOK);
  239         error = getnewvnode("smbfs", mp, &smbfs_vnodeops, &vp);
  240         if (error) {
  241                 FREE(np, M_SMBNODE);
  242                 return error;
  243         }
  244         vp->v_type = fap->fa_attr & SMB_FA_DIR ? VDIR : VREG;
  245         bzero(np, sizeof(*np));
  246         vp->v_data = np;
  247         np->n_vnode = vp;
  248         np->n_mount = VFSTOSMBFS(mp);
  249         np->n_nmlen = nmlen;
  250         np->n_name = smbfs_name_alloc(name, nmlen);
  251         np->n_ino = fap->fa_ino;
  252 
  253         if (dvp) {
  254                 ASSERT_VOP_LOCKED(dvp, "smbfs_node_alloc");
  255                 np->n_parent = dvp;
  256                 if (/*vp->v_type == VDIR &&*/ (dvp->v_vflag & VV_ROOT) == 0) {
  257                         vref(dvp);
  258                         np->n_flag |= NREFPARENT;
  259                 }
  260         } else if (vp->v_type == VREG)
  261                 SMBERROR("new vnode '%s' born without parent ?\n", np->n_name);
  262 
  263         vp->v_vnlock->lk_flags |= LK_CANRECURSE;
  264         vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
  265 
  266         smbfs_hash_lock(smp, td);
  267         LIST_FOREACH(np2, nhpp, n_hash) {
  268                 if (np2->n_parent != dvp ||
  269                     np2->n_nmlen != nmlen || bcmp(name, np2->n_name, nmlen) != 0)
  270                         continue;
  271                 vput(vp);
  272 /*              smb_name_free(np->n_name);
  273                 FREE(np, M_SMBNODE);*/
  274                 goto loop;
  275         }
  276         LIST_INSERT_HEAD(nhpp, np, n_hash);
  277         smbfs_hash_unlock(smp, td);
  278         *vpp = vp;
  279         return 0;
  280 }
  281 
  282 int
  283 smbfs_nget(struct mount *mp, struct vnode *dvp, const char *name, int nmlen,
  284         struct smbfattr *fap, struct vnode **vpp)
  285 {
  286         struct smbnode *np;
  287         struct vnode *vp;
  288         int error;
  289 
  290         *vpp = NULL;
  291         error = smbfs_node_alloc(mp, dvp, name, nmlen, fap, &vp);
  292         if (error)
  293                 return error;
  294         np = VTOSMB(vp);
  295         if (fap)
  296                 smbfs_attr_cacheenter(vp, fap);
  297         *vpp = vp;
  298         return 0;
  299 }
  300 
  301 /*
  302  * Free smbnode, and give vnode back to system
  303  */
  304 int
  305 smbfs_reclaim(ap)                     
  306         struct vop_reclaim_args /* {
  307                 struct vnode *a_vp;
  308                 struct thread *a_p;
  309         } */ *ap;
  310 {
  311         struct vnode *vp = ap->a_vp;
  312         struct thread *td = ap->a_td;
  313         struct vnode *dvp;
  314         struct smbnode *np = VTOSMB(vp);
  315         struct smbmount *smp = VTOSMBFS(vp);
  316         
  317         SMBVDEBUG("%s,%d\n", np->n_name, vrefcnt(vp));
  318 
  319         KASSERT((np->n_flag & NOPEN) == 0, ("file not closed before reclaim"));
  320 
  321         smbfs_hash_lock(smp, td);
  322 
  323         dvp = (np->n_parent && (np->n_flag & NREFPARENT)) ?
  324             np->n_parent : NULL;
  325 
  326         if (np->n_hash.le_prev)
  327                 LIST_REMOVE(np, n_hash);
  328         if (smp->sm_root == np) {
  329                 SMBVDEBUG("root vnode\n");
  330                 smp->sm_root = NULL;
  331         }
  332         vp->v_data = NULL;
  333         vnode_destroy_vobject(vp);
  334         smbfs_hash_unlock(smp, td);
  335         if (np->n_name)
  336                 smbfs_name_free(np->n_name);
  337         FREE(np, M_SMBNODE);
  338         if (dvp != NULL) {
  339                 vrele(dvp);
  340                 /*
  341                  * Indicate that we released something; see comment
  342                  * in smbfs_unmount().
  343                  */
  344                 smp->sm_didrele = 1;
  345         }
  346         return 0;
  347 }
  348 
  349 int
  350 smbfs_inactive(ap)
  351         struct vop_inactive_args /* {
  352                 struct vnode *a_vp;
  353                 struct thread *a_td;
  354         } */ *ap;
  355 {
  356         struct thread *td = ap->a_td;
  357         struct ucred *cred = td->td_ucred;
  358         struct vnode *vp = ap->a_vp;
  359         struct smbnode *np = VTOSMB(vp);
  360         struct smb_cred scred;
  361         struct vattr va;
  362 
  363         SMBVDEBUG("%s: %d\n", VTOSMB(vp)->n_name, vrefcnt(vp));
  364         if ((np->n_flag & NOPEN) != 0) {
  365                 smb_makescred(&scred, td, cred);
  366                 smbfs_vinvalbuf(vp, td);
  367                 if (vp->v_type == VREG) {
  368                         VOP_GETATTR(vp, &va, cred, td);
  369                         smbfs_smb_close(np->n_mount->sm_share, np->n_fid,
  370                             &np->n_mtime, &scred);
  371                 } else if (vp->v_type == VDIR) {
  372                         if (np->n_dirseq != NULL) {
  373                                 smbfs_findclose(np->n_dirseq, &scred);
  374                                 np->n_dirseq = NULL;
  375                         }
  376                 }
  377                 np->n_flag &= ~NOPEN;
  378                 smbfs_attr_cacheremove(vp);
  379         }
  380         if (np->n_flag & NGONE)
  381                 vrecycle(vp, td);
  382         return (0);
  383 }
  384 /*
  385  * routines to maintain vnode attributes cache
  386  * smbfs_attr_cacheenter: unpack np.i to vattr structure
  387  */
  388 void
  389 smbfs_attr_cacheenter(struct vnode *vp, struct smbfattr *fap)
  390 {
  391         struct smbnode *np = VTOSMB(vp);
  392 
  393         if (vp->v_type == VREG) {
  394                 if (np->n_size != fap->fa_size) {
  395                         np->n_size = fap->fa_size;
  396                         vnode_pager_setsize(vp, np->n_size);
  397                 }
  398         } else if (vp->v_type == VDIR) {
  399                 np->n_size = 16384;             /* should be a better way ... */
  400         } else
  401                 return;
  402         np->n_mtime = fap->fa_mtime;
  403         np->n_dosattr = fap->fa_attr;
  404         np->n_attrage = time_second;
  405         return;
  406 }
  407 
  408 int
  409 smbfs_attr_cachelookup(struct vnode *vp, struct vattr *va)
  410 {
  411         struct smbnode *np = VTOSMB(vp);
  412         struct smbmount *smp = VTOSMBFS(vp);
  413         int diff;
  414 
  415         diff = time_second - np->n_attrage;
  416         if (diff > 2)   /* XXX should be configurable */
  417                 return ENOENT;
  418         va->va_type = vp->v_type;               /* vnode type (for create) */
  419         if (vp->v_type == VREG) {
  420                 va->va_mode = smp->sm_file_mode; /* files access mode and type */
  421         } else if (vp->v_type == VDIR) {
  422                 va->va_mode = smp->sm_dir_mode; /* files access mode and type */
  423         } else
  424                 return EINVAL;
  425         va->va_size = np->n_size;
  426         va->va_nlink = 1;               /* number of references to file */
  427         va->va_uid = smp->sm_uid;       /* owner user id */
  428         va->va_gid = smp->sm_gid;       /* owner group id */
  429         va->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0];
  430         va->va_fileid = np->n_ino;      /* file id */
  431         if (va->va_fileid == 0)
  432                 va->va_fileid = 2;
  433         va->va_blocksize = SSTOVC(smp->sm_share)->vc_txmax;
  434         va->va_mtime = np->n_mtime;
  435         va->va_atime = va->va_ctime = va->va_mtime;     /* time file changed */
  436         va->va_gen = VNOVAL;            /* generation number of file */
  437         va->va_flags = 0;               /* flags defined for file */
  438         va->va_rdev = VNOVAL;           /* device the special file represents */
  439         va->va_bytes = va->va_size;     /* bytes of disk space held by file */
  440         va->va_filerev = 0;             /* file modification number */
  441         va->va_vaflags = 0;             /* operations flags */
  442         return 0;
  443 }

Cache object: 9f99cfd147e5b6c2d5b44cc0abc4baea


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