sys/vfs/smbfs/smbfs_node.c

   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: src/sys/fs/smbfs/smbfs_node.c,v 1.2.2.3 2003/01/17 08:20:26 tjr Exp $
  33  * $DragonFly: src/sys/vfs/smbfs/smbfs_node.c,v 1.25 2007/08/08 00:12:52 swildner Exp $
  34  */
  35 #include <sys/param.h>
  36 #include <sys/systm.h>
  37 #include <sys/kernel.h>
  38 #include <sys/time.h>
  39 #include <sys/proc.h>
  40 #include <sys/mount.h>
  41 #include <sys/vnode.h>
  42 #include <sys/malloc.h>
  43 #include <sys/sysctl.h>
  44 #include <vm/vm.h>
  45 #include <vm/vm_extern.h>
  46 /*#include <vm/vm_page.h>
  47 #include <vm/vm_object.h>*/
  48 #include <sys/queue.h>
  49
  50 #include <netproto/smb/smb.h>
  51 #include <netproto/smb/smb_conn.h>
  52 #include <netproto/smb/smb_subr.h>
  53
  54 #include "smbfs.h"
  55 #include "smbfs_node.h"
  56 #include "smbfs_subr.h"
  57
  58 #define SMBFS_NOHASH(smp, hval) (&(smp)->sm_hash[(hval) & (smp)->sm_hashlen])
  59 #define smbfs_hash_lock(smp, td)        lockmgr(&smp->sm_hashlock, LK_EXCLUSIVE)
  60 #define smbfs_hash_unlock(smp, td)      lockmgr(&smp->sm_hashlock, LK_RELEASE)
  61
  62
  63 MALLOC_DEFINE(M_SMBNODE, "SMBFS node", "SMBFS vnode private part");
  64 static MALLOC_DEFINE(M_SMBNODENAME, "SMBFS nname", "SMBFS node name");
  65
  66 int smbfs_hashprint(struct mount *mp);
  67
  68 #if 0
  69 #ifdef SYSCTL_DECL
  70 SYSCTL_DECL(_vfs_smbfs);
  71 #endif
  72 SYSCTL_PROC(_vfs_smbfs, OID_AUTO, vnprint, CTLFLAG_WR|CTLTYPE_OPAQUE,
  73             NULL, 0, smbfs_hashprint, "S,vnlist", "vnode hash");
  74 #endif
  75
  76 #define FNV_32_PRIME ((u_int32_t) 0x01000193UL)
  77 #define FNV1_32_INIT ((u_int32_t) 33554467UL)
  78
  79 u_int32_t
  80 smbfs_hash(const u_char *name, int nmlen)
  81 {
  82         u_int32_t v;
  83
  84         for (v = FNV1_32_INIT; nmlen; name++, nmlen--) {
  85                 v *= FNV_32_PRIME;
  86                 v ^= (u_int32_t)*name;
  87         }
  88         return v;
  89 }
  90
  91 int
  92 smbfs_hashprint(struct mount *mp)
  93 {
  94         struct smbmount *smp = VFSTOSMBFS(mp);
  95         struct smbnode_hashhead *nhpp;
  96         struct smbnode *np;
  97         int i;
  98
  99         for(i = 0; i <= smp->sm_hashlen; i++) {
 100                 nhpp = &smp->sm_hash[i];
 101                 LIST_FOREACH(np, nhpp, n_hash)
 102                         vprint(NULL, SMBTOV(np));
 103         }
 104         return 0;
 105 }
 106
 107 static char *
 108 smbfs_name_alloc(const u_char *name, int nmlen)
 109 {
 110         u_char *cp;
 111
 112         nmlen++;
 113 #ifdef SMBFS_NAME_DEBUG
 114         cp = kmalloc(nmlen + 2 + sizeof(int), M_SMBNODENAME, M_WAITOK);
 115         *(int*)cp = nmlen;
 116         cp += sizeof(int);
 117         cp[0] = 0xfc;
 118         cp++;
 119         bcopy(name, cp, nmlen - 1);
 120         cp[nmlen] = 0xfe;
 121 #else
 122         cp = kmalloc(nmlen, M_SMBNODENAME, M_WAITOK);
 123         bcopy(name, cp, nmlen - 1);
 124 #endif
 125         cp[nmlen - 1] = 0;
 126         return cp;
 127 }
 128
 129 static void
 130 smbfs_name_free(u_char *name)
 131 {
 132 #ifdef SMBFS_NAME_DEBUG
 133         int nmlen, slen;
 134         u_char *cp;
 135
 136         cp = name;
 137         cp--;
 138         if (*cp != 0xfc) {
 139                 kprintf("First byte of name entry '%s' corrupted\n", name);
 140                 Debugger("ditto");
 141         }
 142         cp -= sizeof(int);
 143         nmlen = *(int*)cp;
 144         slen = strlen(name) + 1;
 145         if (nmlen != slen) {
 146                 kprintf("Name length mismatch: was %d, now %d name '%s'\n",
 147                     nmlen, slen, name);
 148                 Debugger("ditto");
 149         }
 150         if (name[nmlen] != 0xfe) {
 151                 kprintf("Last byte of name entry '%s' corrupted\n", name);
 152                 Debugger("ditto");
 153         }
 154         kfree(cp, M_SMBNODENAME);
 155 #else
 156         kfree(name, M_SMBNODENAME);
 157 #endif
 158 }
 159
 160 static int
 161 smbfs_node_alloc(struct mount *mp, struct vnode *dvp,
 162                  const char *name, int nmlen, struct smbfattr *fap,
 163                  struct vnode **vpp)
 164 {
 165         struct smbmount *smp = VFSTOSMBFS(mp);
 166         struct smbnode_hashhead *nhpp;
 167         struct smbnode *np, *np2, *dnp;
 168         struct vnode *vp;
 169         u_long hashval;
 170         int error;
 171
 172         *vpp = NULL;
 173         if (smp->sm_root != NULL && dvp == NULL) {
 174                 SMBERROR("do not allocate root vnode twice!\n");
 175                 return EINVAL;
 176         }
 177         if (nmlen == 2 && bcmp(name, "..", 2) == 0) {
 178                 if (dvp == NULL)
 179                         return EINVAL;
 180                 vp = VTOSMB(VTOSMB(dvp)->n_parent)->n_vnode;
 181                 error = vget(vp, LK_EXCLUSIVE);
 182                 if (error == 0)
 183                         *vpp = vp;
 184                 return error;
 185         } else if (nmlen == 1 && name[0] == '.') {
 186                 SMBERROR("do not call me with dot!\n");
 187                 return EINVAL;
 188         }
 189         dnp = dvp ? VTOSMB(dvp) : NULL;
 190         if (dnp == NULL && dvp != NULL) {
 191                 vprint("smbfs_node_alloc: dead parent vnode", dvp);
 192                 return EINVAL;
 193         }
 194         hashval = smbfs_hash(name, nmlen);
 195 retry:
 196         smbfs_hash_lock(smp, td);
 197 loop:
 198         nhpp = SMBFS_NOHASH(smp, hashval);
 199         LIST_FOREACH(np, nhpp, n_hash) {
 200                 if (np->n_parent != dvp ||
 201                     np->n_nmlen != nmlen || bcmp(name, np->n_name, nmlen) != 0)
 202                         continue;
 203                 vp = SMBTOV(np);
 204                 smbfs_hash_unlock(smp, td);
 205                 if (vget(vp, LK_EXCLUSIVE) != 0)
 206                         goto retry;
 207                 /*
 208                  * relookup after we blocked.
 209                  */
 210                 LIST_FOREACH(np2, nhpp, n_hash) {
 211                         if (np2->n_parent == dvp && np2->n_nmlen == nmlen &&
 212                             bcmp(name, np2->n_name, nmlen) == 0)
 213                                 break;
 214                 }
 215                 if (np2 != np || SMBTOV(np2) != vp) {
 216                         vput(vp);
 217                         goto retry;
 218                 }
 219                 *vpp = vp;
 220                 return 0;
 221         }
 222         smbfs_hash_unlock(smp, td);
 223         /*
 224          * If we don't have node attributes, then it is an explicit lookup
 225          * for an existing vnode.
 226          */
 227         if (fap == NULL)
 228                 return ENOENT;
 229
 230         MALLOC(np, struct smbnode *, sizeof *np, M_SMBNODE, M_WAITOK);
 231         error = getnewvnode(VT_SMBFS, mp, &vp, VLKTIMEOUT, LK_CANRECURSE);
 232         if (error) {
 233                 FREE(np, M_SMBNODE);
 234                 return error;
 235         }
 236         vp->v_type = fap->fa_attr & SMB_FA_DIR ? VDIR : VREG;
 237         bzero(np, sizeof(*np));
 238         vp->v_data = np;
 239         np->n_vnode = vp;
 240         np->n_mount = VFSTOSMBFS(mp);
 241         np->n_nmlen = nmlen;
 242         np->n_name = smbfs_name_alloc(name, nmlen);
 243         np->n_ino = fap->fa_ino;
 244
 245         if (dvp) {
 246                 np->n_parent = dvp;
 247                 if (/*vp->v_type == VDIR &&*/ (dvp->v_flag & VROOT) == 0) {
 248                         vref(dvp);
 249                         np->n_flag |= NREFPARENT;
 250                 }
 251         } else if (vp->v_type == VREG)
 252                 SMBERROR("new vnode '%s' born without parent ?\n", np->n_name);
 253
 254         smbfs_hash_lock(smp, td);
 255         LIST_FOREACH(np2, nhpp, n_hash) {
 256                 if (np2->n_parent != dvp ||
 257                     np2->n_nmlen != nmlen || bcmp(name, np2->n_name, nmlen) != 0)
 258                         continue;
 259                 vx_put(vp);
 260 /*              smb_name_free(np->n_name);
 261                 FREE(np, M_SMBNODE);*/
 262                 goto loop;
 263         }
 264         LIST_INSERT_HEAD(nhpp, np, n_hash);
 265         smbfs_hash_unlock(smp, td);
 266         /*
 267          * Return a locked and refd vnode
 268          */
 269         *vpp = vp;
 270         return 0;
 271 }
 272
 273 int
 274 smbfs_nget(struct mount *mp, struct vnode *dvp, const char *name, int nmlen,
 275            struct smbfattr *fap, struct vnode **vpp)
 276 {
 277         struct smbnode *np;
 278         struct vnode *vp;
 279         int error;
 280
 281         *vpp = NULL;
 282         error = smbfs_node_alloc(mp, dvp, name, nmlen, fap, &vp);
 283         if (error)
 284                 return error;
 285         np = VTOSMB(vp);
 286         if (fap)
 287                 smbfs_attr_cacheenter(vp, fap);
 288         *vpp = vp;
 289         return 0;
 290 }
 291
 292 /*
 293  * Free smbnode, and give vnode back to system
 294  *
 295  * smbfs_reclaim(struct vnode *a_vp)
 296  */
 297 int
 298 smbfs_reclaim(struct vop_reclaim_args *ap)
 299 {
 300         struct vnode *vp = ap->a_vp;
 301         struct vnode *dvp;
 302         struct smbnode *np = VTOSMB(vp);
 303         struct smbmount *smp = VTOSMBFS(vp);
 304
 305         SMBVDEBUG("%s,%d\n", np->n_name, vp->v_sysref.refcnt);
 306
 307         smbfs_hash_lock(smp, td);
 308
 309         dvp = (np->n_parent && (np->n_flag & NREFPARENT)) ?
 310             np->n_parent : NULL;
 311
 312         if (np->n_hash.le_prev)
 313                 LIST_REMOVE(np, n_hash);
 314         if (smp->sm_root == np) {
 315                 SMBVDEBUG("root vnode\n");
 316                 smp->sm_root = NULL;
 317         }
 318         vp->v_data = NULL;
 319         smbfs_hash_unlock(smp, td);
 320         if (np->n_name)
 321                 smbfs_name_free(np->n_name);
 322         FREE(np, M_SMBNODE);
 323         if (dvp) {
 324                 /*
 325                  * Indicate that we released something; see comment
 326                  * in smbfs_unmount().
 327                  */
 328                 smp->sm_didrele = 1;
 329                 vrele(dvp);
 330         }
 331         return 0;
 332 }
 333
 334 /*
 335  * smbfs_inactive(struct vnode *a_vp)
 336  */
 337 int
 338 smbfs_inactive(struct vop_inactive_args *ap)
 339 {
 340         struct ucred *cred;
 341         struct vnode *vp = ap->a_vp;
 342         struct smbnode *np = VTOSMB(vp);
 343         struct smb_cred scred;
 344         int error;
 345
 346         SMBVDEBUG("%s: %d\n", VTOSMB(vp)->n_name, vp->v_sysref.refcnt);
 347         if (np->n_opencount) {
 348                 error = smbfs_vinvalbuf(vp, V_SAVE, 1);
 349                 cred = np->n_cached_cred;
 350                 np->n_cached_cred = NULL;
 351                 smb_makescred(&scred, curthread, cred);
 352                 error = smbfs_smb_close(np->n_mount->sm_share, np->n_fid,
 353                    &np->n_mtime, &scred);
 354                 np->n_opencount = 0;
 355                 crfree(cred);
 356         }
 357         return (0);
 358 }
 359 /*
 360  * routines to maintain vnode attributes cache
 361  * smbfs_attr_cacheenter: unpack np.i to vattr structure
 362  */
 363 void
 364 smbfs_attr_cacheenter(struct vnode *vp, struct smbfattr *fap)
 365 {
 366         struct smbnode *np = VTOSMB(vp);
 367
 368         if (vp->v_type == VREG) {
 369                 if (np->n_size != fap->fa_size) {
 370                         np->n_size = fap->fa_size;
 371                         vnode_pager_setsize(vp, np->n_size);
 372                 }
 373         } else if (vp->v_type == VDIR) {
 374                 np->n_size = 16384;             /* should be a better way ... */
 375         } else
 376                 return;
 377         np->n_mtime = fap->fa_mtime;
 378         np->n_dosattr = fap->fa_attr;
 379         np->n_attrage = time_second;
 380         return;
 381 }
 382
 383 int
 384 smbfs_attr_cachelookup(struct vnode *vp, struct vattr *va)
 385 {
 386         struct smbnode *np = VTOSMB(vp);
 387         struct smbmount *smp = VTOSMBFS(vp);
 388         int diff;
 389
 390         diff = time_second - np->n_attrage;
 391         if (diff > 2)   /* XXX should be configurable */
 392                 return ENOENT;
 393         va->va_type = vp->v_type;               /* vnode type (for create) */
 394         if (vp->v_type == VREG) {
 395                 va->va_mode = smp->sm_args.file_mode;   /* files access mode and type */
 396         } else if (vp->v_type == VDIR) {
 397                 va->va_mode = smp->sm_args.dir_mode;    /* files access mode and type */
 398         } else
 399                 return EINVAL;
 400         va->va_size = np->n_size;
 401         va->va_nlink = 1;               /* number of references to file */
 402         va->va_uid = smp->sm_args.uid;  /* owner user id */
 403         va->va_gid = smp->sm_args.gid;  /* owner group id */
 404         va->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0];
 405         va->va_fileid = np->n_ino;      /* file id */
 406         if (va->va_fileid == 0)
 407                 va->va_fileid = 2;
 408         va->va_blocksize = SSTOVC(smp->sm_share)->vc_txmax;
 409         va->va_mtime = np->n_mtime;
 410         va->va_atime = va->va_ctime = va->va_mtime;     /* time file changed */
 411         va->va_gen = VNOVAL;            /* generation number of file */
 412         va->va_flags = 0;               /* flags defined for file */
 413         va->va_rmajor = VNOVAL;         /* device the special file represents */
 414         va->va_rminor = VNOVAL;
 415         va->va_bytes = va->va_size;     /* bytes of disk space held by file */
 416         va->va_filerev = 0;             /* file modification number */
 417         va->va_vaflags = 0;             /* operations flags */
 418         return 0;
 419 }