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  */
  34 #include <sys/param.h>
  35 #include <sys/systm.h>
  36 #include <sys/kernel.h>
  37 #include <sys/time.h>
  38 #include <sys/proc.h>
  39 #include <sys/mount.h>
  40 #include <sys/vnode.h>
  41 #include <sys/malloc.h>
  42 #include <sys/sysctl.h>
  43 #include <vm/vm.h>
  44 #include <vm/vm_extern.h>
  45 /*#include <vm/vm_page.h>
  46 #include <vm/vm_object.h>*/
  47 #include <sys/queue.h>
  48
  49 #include <netproto/smb/smb.h>
  50 #include <netproto/smb/smb_conn.h>
  51 #include <netproto/smb/smb_subr.h>
  52
  53 #include "smbfs.h"
  54 #include "smbfs_node.h"
  55 #include "smbfs_subr.h"
  56
  57 #define SMBFS_NOHASH(smp, hval) (&(smp)->sm_hash[(hval) & (smp)->sm_hashlen])
  58 #define smbfs_hash_lock(smp, td)        lockmgr(&smp->sm_hashlock, LK_EXCLUSIVE)
  59 #define smbfs_hash_unlock(smp, td)      lockmgr(&smp->sm_hashlock, LK_RELEASE)
  60
  61
  62 MALLOC_DEFINE(M_SMBNODE, "SMBFS node", "SMBFS vnode private part");
  63 static MALLOC_DEFINE(M_SMBNODENAME, "SMBFS nname", "SMBFS node name");
  64
  65 int smbfs_hashprint(struct mount *mp);
  66
  67 #if 0
  68 #ifdef SYSCTL_DECL
  69 SYSCTL_DECL(_vfs_smbfs);
  70 #endif
  71 SYSCTL_PROC(_vfs_smbfs, OID_AUTO, vnprint, CTLFLAG_WR|CTLTYPE_OPAQUE,
  72             NULL, 0, smbfs_hashprint, "S,vnlist", "vnode hash");
  73 #endif
  74
  75 #define FNV_32_PRIME ((u_int32_t) 0x01000193UL)
  76 #define FNV1_32_INIT ((u_int32_t) 33554467UL)
  77
  78 u_int32_t
  79 smbfs_hash(const u_char *name, int nmlen)
  80 {
  81         u_int32_t v;
  82
  83         for (v = FNV1_32_INIT; nmlen; name++, nmlen--) {
  84                 v *= FNV_32_PRIME;
  85                 v ^= (u_int32_t)*name;
  86         }
  87         return v;
  88 }
  89
  90 int
  91 smbfs_hashprint(struct mount *mp)
  92 {
  93         struct smbmount *smp = VFSTOSMBFS(mp);
  94         struct smbnode_hashhead *nhpp;
  95         struct smbnode *np;
  96         int i;
  97
  98         for(i = 0; i <= smp->sm_hashlen; i++) {
  99                 nhpp = &smp->sm_hash[i];
 100                 LIST_FOREACH(np, nhpp, n_hash)
 101                         vprint(NULL, SMBTOV(np));
 102         }
 103         return 0;
 104 }
 105
 106 static char *
 107 smbfs_name_alloc(const u_char *name, int nmlen)
 108 {
 109         u_char *cp;
 110
 111         nmlen++;
 112 #ifdef SMBFS_NAME_DEBUG
 113         cp = kmalloc(nmlen + 2 + sizeof(int), M_SMBNODENAME, M_WAITOK);
 114         *(int*)cp = nmlen;
 115         cp += sizeof(int);
 116         cp[0] = 0xfc;
 117         cp++;
 118         bcopy(name, cp, nmlen - 1);
 119         cp[nmlen] = 0xfe;
 120 #else
 121         cp = kmalloc(nmlen, M_SMBNODENAME, M_WAITOK);
 122         bcopy(name, cp, nmlen - 1);
 123 #endif
 124         cp[nmlen - 1] = 0;
 125         return cp;
 126 }
 127
 128 static void
 129 smbfs_name_free(u_char *name)
 130 {
 131 #ifdef SMBFS_NAME_DEBUG
 132         int nmlen, slen;
 133         u_char *cp;
 134
 135         cp = name;
 136         cp--;
 137         if (*cp != 0xfc) {
 138                 kprintf("First byte of name entry '%s' corrupted\n", name);
 139                 Debugger("ditto");
 140         }
 141         cp -= sizeof(int);
 142         nmlen = *(int*)cp;
 143         slen = strlen(name) + 1;
 144         if (nmlen != slen) {
 145                 kprintf("Name length mismatch: was %d, now %d name '%s'\n",
 146                     nmlen, slen, name);
 147                 Debugger("ditto");
 148         }
 149         if (name[nmlen] != 0xfe) {
 150                 kprintf("Last byte of name entry '%s' corrupted\n", name);
 151                 Debugger("ditto");
 152         }
 153         kfree(cp, M_SMBNODENAME);
 154 #else
 155         kfree(name, M_SMBNODENAME);
 156 #endif
 157 }
 158
 159 static int
 160 smbfs_node_alloc(struct mount *mp, struct vnode *dvp,
 161                  const char *name, int nmlen, struct smbfattr *fap,
 162                  struct vnode **vpp)
 163 {
 164         struct smbmount *smp = VFSTOSMBFS(mp);
 165         struct smbnode_hashhead *nhpp;
 166         struct smbnode *np, *np2, *dnp;
 167         struct vnode *vp;
 168         u_long hashval;
 169         int error;
 170
 171         *vpp = NULL;
 172         if (smp->sm_root != NULL && dvp == NULL) {
 173                 SMBERROR("do not allocate root vnode twice!\n");
 174                 return EINVAL;
 175         }
 176         if (nmlen == 2 && bcmp(name, "..", 2) == 0) {
 177                 if (dvp == NULL)
 178                         return EINVAL;
 179                 vp = VTOSMB(VTOSMB(dvp)->n_parent)->n_vnode;
 180                 error = vget(vp, LK_EXCLUSIVE);
 181                 if (error == 0)
 182                         *vpp = vp;
 183                 return error;
 184         } else if (nmlen == 1 && name[0] == '.') {
 185                 SMBERROR("do not call me with dot!\n");
 186                 return EINVAL;
 187         }
 188         dnp = dvp ? VTOSMB(dvp) : NULL;
 189         if (dnp == NULL && dvp != NULL) {
 190                 vprint("smbfs_node_alloc: dead parent vnode", dvp);
 191                 return EINVAL;
 192         }
 193         hashval = smbfs_hash(name, nmlen);
 194 retry:
 195         smbfs_hash_lock(smp, td);
 196 loop:
 197         nhpp = SMBFS_NOHASH(smp, hashval);
 198         LIST_FOREACH(np, nhpp, n_hash) {
 199                 if (np->n_parent != dvp ||
 200                     np->n_nmlen != nmlen || bcmp(name, np->n_name, nmlen) != 0)
 201                         continue;
 202                 vp = SMBTOV(np);
 203                 smbfs_hash_unlock(smp, td);
 204                 if (vget(vp, LK_EXCLUSIVE) != 0)
 205                         goto retry;
 206                 /*
 207                  * relookup after we blocked.
 208                  */
 209                 LIST_FOREACH(np2, nhpp, n_hash) {
 210                         if (np2->n_parent == dvp && np2->n_nmlen == nmlen &&
 211                             bcmp(name, np2->n_name, nmlen) == 0)
 212                                 break;
 213                 }
 214                 if (np2 != np || SMBTOV(np2) != vp) {
 215                         vput(vp);
 216                         goto retry;
 217                 }
 218                 *vpp = vp;
 219                 return 0;
 220         }
 221         smbfs_hash_unlock(smp, td);
 222         /*
 223          * If we don't have node attributes, then it is an explicit lookup
 224          * for an existing vnode.
 225          */
 226         if (fap == NULL)
 227                 return ENOENT;
 228
 229         np = kmalloc(sizeof *np, M_SMBNODE, M_WAITOK | M_ZERO);
 230         error = getnewvnode(VT_SMBFS, mp, &vp, VLKTIMEOUT, LK_CANRECURSE);
 231         if (error) {
 232                 kfree(np, M_SMBNODE);
 233                 return error;
 234         }
 235         vp->v_type = fap->fa_attr & SMB_FA_DIR ? VDIR : VREG;
 236         vp->v_data = np;
 237         np->n_vnode = vp;
 238         np->n_mount = VFSTOSMBFS(mp);
 239         np->n_nmlen = nmlen;
 240         np->n_name = smbfs_name_alloc(name, nmlen);
 241         np->n_ino = fap->fa_ino;
 242
 243         if (dvp) {
 244                 np->n_parent = dvp;
 245                 if (/*vp->v_type == VDIR &&*/ (dvp->v_flag & VROOT) == 0) {
 246                         vref(dvp);
 247                         np->n_flag |= NREFPARENT;
 248                 }
 249         } else if (vp->v_type == VREG)
 250                 SMBERROR("new vnode '%s' born without parent ?\n", np->n_name);
 251
 252         smbfs_hash_lock(smp, td);
 253         LIST_FOREACH(np2, nhpp, n_hash) {
 254                 if (np2->n_parent != dvp ||
 255                     np2->n_nmlen != nmlen || bcmp(name, np2->n_name, nmlen) != 0)
 256                         continue;
 257                 vx_put(vp);
 258 /*              smb_name_free(np->n_name);
 259                 FREE(np, M_SMBNODE);*/
 260                 goto loop;
 261         }
 262         LIST_INSERT_HEAD(nhpp, np, n_hash);
 263         smbfs_hash_unlock(smp, td);
 264         /*
 265          * Return a locked and refd vnode
 266          */
 267         *vpp = vp;
 268         return 0;
 269 }
 270
 271 int
 272 smbfs_nget(struct mount *mp, struct vnode *dvp, const char *name, int nmlen,
 273            struct smbfattr *fap, struct vnode **vpp)
 274 {
 275         struct vnode *vp;
 276         int error;
 277
 278         *vpp = NULL;
 279         error = smbfs_node_alloc(mp, dvp, name, nmlen, fap, &vp);
 280         if (error)
 281                 return error;
 282         if (fap)
 283                 smbfs_attr_cacheenter(vp, fap);
 284         *vpp = vp;
 285         return 0;
 286 }
 287
 288 /*
 289  * Free smbnode, and give vnode back to system
 290  *
 291  * smbfs_reclaim(struct vnode *a_vp)
 292  */
 293 int
 294 smbfs_reclaim(struct vop_reclaim_args *ap)
 295 {
 296         struct vnode *vp = ap->a_vp;
 297         struct vnode *dvp;
 298         struct smbnode *np = VTOSMB(vp);
 299         struct smbmount *smp = VTOSMBFS(vp);
 300
 301         SMBVDEBUG("%s,%08x\n", np->n_name, vp->v_refcnt);
 302
 303         smbfs_hash_lock(smp, td);
 304
 305         dvp = (np->n_parent && (np->n_flag & NREFPARENT)) ?
 306             np->n_parent : NULL;
 307
 308         if (np->n_hash.le_prev)
 309                 LIST_REMOVE(np, n_hash);
 310         if (smp->sm_root == np) {
 311                 SMBVDEBUG("root vnode\n");
 312                 smp->sm_root = NULL;
 313         }
 314         vp->v_data = NULL;
 315         smbfs_hash_unlock(smp, td);
 316         if (np->n_name)
 317                 smbfs_name_free(np->n_name);
 318         kfree(np, M_SMBNODE);
 319         if (dvp) {
 320                 /*
 321                  * Indicate that we released something; see comment
 322                  * in smbfs_unmount().
 323                  */
 324                 smp->sm_didrele = 1;
 325                 vrele(dvp);
 326         }
 327         return 0;
 328 }
 329
 330 /*
 331  * smbfs_inactive(struct vnode *a_vp)
 332  */
 333 int
 334 smbfs_inactive(struct vop_inactive_args *ap)
 335 {
 336         struct ucred *cred;
 337         struct vnode *vp = ap->a_vp;
 338         struct smbnode *np = VTOSMB(vp);
 339         struct smb_cred scred;
 340         int error;
 341
 342         SMBVDEBUG("%s: %08x\n", VTOSMB(vp)->n_name, vp->v_refcnt);
 343         if (np->n_opencount) {
 344                 error = smbfs_vinvalbuf(vp, V_SAVE, 1);
 345                 cred = np->n_cached_cred;
 346                 np->n_cached_cred = NULL;
 347                 smb_makescred(&scred, curthread, cred);
 348                 error = smbfs_smb_close(np->n_mount->sm_share, np->n_fid,
 349                    &np->n_mtime, &scred);
 350                 np->n_opencount = 0;
 351                 crfree(cred);
 352         }
 353         return (0);
 354 }
 355 /*
 356  * routines to maintain vnode attributes cache
 357  * smbfs_attr_cacheenter: unpack np.i to vattr structure
 358  */
 359 void
 360 smbfs_attr_cacheenter(struct vnode *vp, struct smbfattr *fap)
 361 {
 362         struct smbnode *np = VTOSMB(vp);
 363
 364         if (vp->v_type == VREG) {
 365                 if (np->n_size != fap->fa_size) {
 366                         np->n_size = fap->fa_size;
 367                         vnode_pager_setsize(vp, np->n_size);
 368                 }
 369         } else if (vp->v_type == VDIR) {
 370                 np->n_size = 16384;             /* should be a better way ... */
 371         } else
 372                 return;
 373         np->n_mtime = fap->fa_mtime;
 374         np->n_dosattr = fap->fa_attr;
 375         np->n_attrage = time_uptime;
 376         return;
 377 }
 378
 379 int
 380 smbfs_attr_cachelookup(struct vnode *vp, struct vattr *va)
 381 {
 382         struct smbnode *np = VTOSMB(vp);
 383         struct smbmount *smp = VTOSMBFS(vp);
 384         int diff;
 385
 386         diff = (int)(time_uptime - np->n_attrage);
 387         if (diff > 2)   /* XXX should be configurable */
 388                 return ENOENT;
 389         va->va_type = vp->v_type;               /* vnode type (for create) */
 390         if (vp->v_type == VREG) {
 391                 va->va_mode = smp->sm_args.file_mode;   /* files access mode and type */
 392         } else if (vp->v_type == VDIR) {
 393                 va->va_mode = smp->sm_args.dir_mode;    /* files access mode and type */
 394         } else
 395                 return EINVAL;
 396         va->va_size = np->n_size;
 397         va->va_nlink = 1;               /* number of references to file */
 398         va->va_uid = smp->sm_args.uid;  /* owner user id */
 399         va->va_gid = smp->sm_args.gid;  /* owner group id */
 400         va->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0];
 401         va->va_fileid = np->n_ino;      /* file id */
 402         if (va->va_fileid == 0)
 403                 va->va_fileid = 2;
 404         va->va_blocksize = SSTOVC(smp->sm_share)->vc_txmax;
 405         va->va_mtime = np->n_mtime;
 406         va->va_atime = va->va_ctime = va->va_mtime;     /* time file changed */
 407         va->va_gen = VNOVAL;            /* generation number of file */
 408         va->va_flags = 0;               /* flags defined for file */
 409         va->va_rmajor = VNOVAL;         /* device the special file represents */
 410         va->va_rminor = VNOVAL;
 411         va->va_bytes = va->va_size;     /* bytes of disk space held by file */
 412         va->va_filerev = 0;             /* file modification number */
 413         va->va_vaflags = 0;             /* operations flags */
 414         return 0;
 415 }
 416
 417 void
 418 smbfs_attr_cacherename(struct vnode *vp, const char *name, int nmlen)
 419 {
 420         struct smbnode_hashhead *nhpp;
 421         struct smbmount *smp = VTOSMBFS(vp);
 422         struct smbnode *np;
 423         u_long hashval;
 424
 425         hashval = smbfs_hash(name, nmlen);
 426
 427         smbfs_hash_lock(smp, td);
 428
 429         np = VTOSMB(vp);
 430         if (np->n_hash.le_prev)
 431                 LIST_REMOVE(np, n_hash);
 432
 433         smbfs_name_free(np->n_name);
 434         np->n_nmlen = nmlen;
 435         np->n_name = smbfs_name_alloc(name, nmlen);
 436
 437         nhpp = SMBFS_NOHASH(smp, hashval);
 438         LIST_INSERT_HEAD(nhpp, np, n_hash);
 439
 440         smbfs_hash_unlock(smp, td);
 441 }