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  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  *
   26  * $FreeBSD: releng/10.0/sys/fs/smbfs/smbfs_node.c 254627 2013-08-21 23:04:48Z ken $
   27  */
   28 #include <sys/param.h>
   29 #include <sys/systm.h>
   30 #include <sys/fnv_hash.h>
   31 #include <sys/kernel.h>
   32 #include <sys/lock.h>
   33 #include <sys/malloc.h>
   34 #include <sys/mount.h>
   35 #include <sys/proc.h>
   36 #include <sys/queue.h>
   37 #include <sys/stat.h>
   38 #include <sys/sx.h>
   39 #include <sys/sysctl.h>
   40 #include <sys/time.h>
   41 #include <sys/vnode.h>
   42 
   43 #include <netsmb/smb.h>
   44 #include <netsmb/smb_conn.h>
   45 #include <netsmb/smb_subr.h>
   46 
   47 #include <vm/vm.h>
   48 #include <vm/vm_extern.h>
   49 /*#include <vm/vm_page.h>
   50 #include <vm/vm_object.h>*/
   51 
   52 #include <fs/smbfs/smbfs.h>
   53 #include <fs/smbfs/smbfs_node.h>
   54 #include <fs/smbfs/smbfs_subr.h>
   55 
   56 extern struct vop_vector smbfs_vnodeops;        /* XXX -> .h file */
   57 
   58 static MALLOC_DEFINE(M_SMBNODE, "smbufs_node", "SMBFS vnode private part");
   59 static MALLOC_DEFINE(M_SMBNODENAME, "smbufs_nname", "SMBFS node name");
   60 
   61 u_int32_t __inline
   62 smbfs_hash(const u_char *name, int nmlen)
   63 {
   64         return (fnv_32_buf(name, nmlen, FNV1_32_INIT)); 
   65 }
   66 
   67 static char *
   68 smbfs_name_alloc(const u_char *name, int nmlen)
   69 {
   70         u_char *cp;
   71 
   72         nmlen++;
   73         cp = malloc(nmlen, M_SMBNODENAME, M_WAITOK);
   74         bcopy(name, cp, nmlen - 1);
   75         cp[nmlen - 1] = 0;
   76         return cp;
   77 }
   78 
   79 static void
   80 smbfs_name_free(u_char *name)
   81 {
   82 
   83         free(name, M_SMBNODENAME);
   84 }
   85 
   86 static int __inline
   87 smbfs_vnode_cmp(struct vnode *vp, void *_sc) 
   88 {
   89         struct smbnode *np;
   90         struct smbcmp *sc;
   91 
   92         np = (struct smbnode *) vp->v_data;
   93         sc = (struct smbcmp *) _sc;
   94         if (np->n_parent != sc->n_parent || np->n_nmlen != sc->n_nmlen ||
   95             bcmp(sc->n_name, np->n_name, sc->n_nmlen) != 0)
   96                 return 1;
   97         return 0;
   98 }
   99 
  100 static int
  101 smbfs_node_alloc(struct mount *mp, struct vnode *dvp, const char *dirnm, 
  102         int dirlen, const char *name, int nmlen, char sep, 
  103         struct smbfattr *fap, struct vnode **vpp)
  104 {
  105         struct vattr vattr;
  106         struct thread *td = curthread;  /* XXX */
  107         struct smbmount *smp = VFSTOSMBFS(mp);
  108         struct smbnode *np, *dnp;
  109         struct vnode *vp, *vp2;
  110         struct smbcmp sc;
  111         char *p, *rpath;
  112         int error, rplen;
  113 
  114         sc.n_parent = dvp;
  115         sc.n_nmlen = nmlen;
  116         sc.n_name = name;       
  117         if (smp->sm_root != NULL && dvp == NULL) {
  118                 SMBERROR("do not allocate root vnode twice!\n");
  119                 return EINVAL;
  120         }
  121         if (nmlen == 2 && bcmp(name, "..", 2) == 0) {
  122                 if (dvp == NULL)
  123                         return EINVAL;
  124                 vp = VTOSMB(VTOSMB(dvp)->n_parent)->n_vnode;
  125                 error = vget(vp, LK_EXCLUSIVE, td);
  126                 if (error == 0)
  127                         *vpp = vp;
  128                 return error;
  129         } else if (nmlen == 1 && name[0] == '.') {
  130                 SMBERROR("do not call me with dot!\n");
  131                 return EINVAL;
  132         }
  133         dnp = dvp ? VTOSMB(dvp) : NULL;
  134         if (dnp == NULL && dvp != NULL) {
  135                 vprint("smbfs_node_alloc: dead parent vnode", dvp);
  136                 return EINVAL;
  137         }
  138         error = vfs_hash_get(mp, smbfs_hash(name, nmlen), LK_EXCLUSIVE, td,
  139             vpp, smbfs_vnode_cmp, &sc);
  140         if (error)
  141                 return (error);
  142         if (*vpp) {
  143                 np = VTOSMB(*vpp);
  144                 /* Force cached attributes to be refreshed if stale. */
  145                 (void)VOP_GETATTR(*vpp, &vattr, td->td_ucred);
  146                 /*
  147                  * If the file type on the server is inconsistent with
  148                  * what it was when we created the vnode, kill the
  149                  * bogus vnode now and fall through to the code below
  150                  * to create a new one with the right type.
  151                  */
  152                 if (((*vpp)->v_type == VDIR && 
  153                     (np->n_dosattr & SMB_FA_DIR) == 0) ||
  154                     ((*vpp)->v_type == VREG && 
  155                     (np->n_dosattr & SMB_FA_DIR) != 0)) {
  156                         vgone(*vpp);
  157                         vput(*vpp);
  158                 }
  159                 else {
  160                         SMBVDEBUG("vnode taken from the hashtable\n");
  161                         return (0);
  162                 }
  163         }
  164         /*
  165          * If we don't have node attributes, then it is an explicit lookup
  166          * for an existing vnode.
  167          */
  168         if (fap == NULL)
  169                 return ENOENT;
  170 
  171         error = getnewvnode("smbfs", mp, &smbfs_vnodeops, vpp);
  172         if (error)
  173                 return (error);
  174         vp = *vpp;
  175         np = malloc(sizeof *np, M_SMBNODE, M_WAITOK | M_ZERO);
  176         rplen = dirlen;
  177         if (sep != '\0')
  178                 rplen++;
  179         rplen += nmlen;
  180         rpath = malloc(rplen + 1, M_SMBNODENAME, M_WAITOK);
  181         p = rpath;
  182         bcopy(dirnm, p, dirlen);
  183         p += dirlen;
  184         if (sep != '\0')
  185                 *p++ = sep;
  186         if (name != NULL) {
  187                 bcopy(name, p, nmlen);
  188                 p += nmlen;
  189         }
  190         *p = '\0';
  191         MPASS(p == rpath + rplen);
  192         lockmgr(vp->v_vnlock, LK_EXCLUSIVE, NULL);
  193         /* Vnode initialization */
  194         vp->v_type = fap->fa_attr & SMB_FA_DIR ? VDIR : VREG;
  195         vp->v_data = np;
  196         np->n_vnode = vp;
  197         np->n_mount = VFSTOSMBFS(mp);
  198         np->n_rpath = rpath;
  199         np->n_rplen = rplen;
  200         np->n_nmlen = nmlen;
  201         np->n_name = smbfs_name_alloc(name, nmlen);
  202         np->n_ino = fap->fa_ino;
  203         if (dvp) {
  204                 ASSERT_VOP_LOCKED(dvp, "smbfs_node_alloc");
  205                 np->n_parent = dvp;
  206                 np->n_parentino = VTOSMB(dvp)->n_ino;
  207                 if (/*vp->v_type == VDIR &&*/ (dvp->v_vflag & VV_ROOT) == 0) {
  208                         vref(dvp);
  209                         np->n_flag |= NREFPARENT;
  210                 }
  211         } else if (vp->v_type == VREG)
  212                 SMBERROR("new vnode '%s' born without parent ?\n", np->n_name);
  213         error = insmntque(vp, mp);
  214         if (error) {
  215                 free(np, M_SMBNODE);
  216                 return (error);
  217         }
  218         error = vfs_hash_insert(vp, smbfs_hash(name, nmlen), LK_EXCLUSIVE,
  219             td, &vp2, smbfs_vnode_cmp, &sc);
  220         if (error) 
  221                 return (error);
  222         if (vp2 != NULL)
  223                 *vpp = vp2;
  224         return (0);
  225 }
  226 
  227 int
  228 smbfs_nget(struct mount *mp, struct vnode *dvp, const char *name, int nmlen,
  229         struct smbfattr *fap, struct vnode **vpp)
  230 {
  231         struct smbnode *dnp, *np;
  232         struct vnode *vp;
  233         int error, sep;
  234 
  235         dnp = (dvp) ? VTOSMB(dvp) : NULL;
  236         sep = 0;
  237         if (dnp != NULL) {
  238                 sep = SMBFS_DNP_SEP(dnp); 
  239                 error = smbfs_node_alloc(mp, dvp, dnp->n_rpath, dnp->n_rplen, 
  240                     name, nmlen, sep, fap, &vp); 
  241         } else
  242                 error = smbfs_node_alloc(mp, NULL, "\\", 1, name, nmlen, 
  243                     sep, fap, &vp); 
  244         if (error)
  245                 return error;
  246         MPASS(vp != NULL);
  247         np = VTOSMB(vp);
  248         if (fap)
  249                 smbfs_attr_cacheenter(vp, fap);
  250         *vpp = vp;
  251         return 0;
  252 }
  253 
  254 /*
  255  * Free smbnode, and give vnode back to system
  256  */
  257 int
  258 smbfs_reclaim(ap)                     
  259         struct vop_reclaim_args /* {
  260                 struct vnode *a_vp;
  261                 struct thread *a_p;
  262         } */ *ap;
  263 {
  264         struct vnode *vp = ap->a_vp;
  265         struct vnode *dvp;
  266         struct smbnode *np = VTOSMB(vp);
  267         struct smbmount *smp = VTOSMBFS(vp);
  268         
  269         SMBVDEBUG("%s,%d\n", np->n_name, vrefcnt(vp));
  270 
  271         KASSERT((np->n_flag & NOPEN) == 0, ("file not closed before reclaim"));
  272 
  273         /*
  274          * Destroy the vm object and flush associated pages.
  275          */
  276         vnode_destroy_vobject(vp);
  277         dvp = (np->n_parent && (np->n_flag & NREFPARENT)) ?
  278             np->n_parent : NULL;
  279         
  280         /*
  281          * Remove the vnode from its hash chain.
  282          */
  283         vfs_hash_remove(vp);
  284         if (np->n_name)
  285                 smbfs_name_free(np->n_name);
  286         if (np->n_rpath)
  287                 free(np->n_rpath, M_SMBNODENAME);
  288         free(np, M_SMBNODE);
  289         vp->v_data = NULL;
  290         if (dvp != NULL) {
  291                 vrele(dvp);
  292                 /*
  293                  * Indicate that we released something; see comment
  294                  * in smbfs_unmount().
  295                  */
  296                 smp->sm_didrele = 1;
  297         }
  298         return 0;
  299 }
  300 
  301 int
  302 smbfs_inactive(ap)
  303         struct vop_inactive_args /* {
  304                 struct vnode *a_vp;
  305                 struct thread *a_td;
  306         } */ *ap;
  307 {
  308         struct thread *td = ap->a_td;
  309         struct ucred *cred = td->td_ucred;
  310         struct vnode *vp = ap->a_vp;
  311         struct smbnode *np = VTOSMB(vp);
  312         struct smb_cred *scred;
  313         struct vattr va;
  314 
  315         SMBVDEBUG("%s: %d\n", VTOSMB(vp)->n_name, vrefcnt(vp));
  316         if ((np->n_flag & NOPEN) != 0) {
  317                 scred = smbfs_malloc_scred();
  318                 smb_makescred(scred, td, cred);
  319                 smbfs_vinvalbuf(vp, td);
  320                 if (vp->v_type == VREG) {
  321                         VOP_GETATTR(vp, &va, cred);
  322                         smbfs_smb_close(np->n_mount->sm_share, np->n_fid,
  323                             &np->n_mtime, scred);
  324                 } else if (vp->v_type == VDIR) {
  325                         if (np->n_dirseq != NULL) {
  326                                 smbfs_findclose(np->n_dirseq, scred);
  327                                 np->n_dirseq = NULL;
  328                         }
  329                 }
  330                 np->n_flag &= ~NOPEN;
  331                 smbfs_attr_cacheremove(vp);
  332                 smbfs_free_scred(scred);
  333         }
  334         if (np->n_flag & NGONE)
  335                 vrecycle(vp);
  336         return (0);
  337 }
  338 /*
  339  * routines to maintain vnode attributes cache
  340  * smbfs_attr_cacheenter: unpack np.i to vattr structure
  341  */
  342 void
  343 smbfs_attr_cacheenter(struct vnode *vp, struct smbfattr *fap)
  344 {
  345         struct smbnode *np = VTOSMB(vp);
  346 
  347         if (vp->v_type == VREG) {
  348                 if (np->n_size != fap->fa_size) {
  349                         np->n_size = fap->fa_size;
  350                         vnode_pager_setsize(vp, np->n_size);
  351                 }
  352         } else if (vp->v_type == VDIR) {
  353                 np->n_size = 16384;             /* should be a better way ... */
  354         } else
  355                 return;
  356         np->n_mtime = fap->fa_mtime;
  357         np->n_dosattr = fap->fa_attr;
  358         np->n_attrage = time_second;
  359         return;
  360 }
  361 
  362 int
  363 smbfs_attr_cachelookup(struct vnode *vp, struct vattr *va)
  364 {
  365         struct smbnode *np = VTOSMB(vp);
  366         struct smbmount *smp = VTOSMBFS(vp);
  367         int diff;
  368 
  369         diff = time_second - np->n_attrage;
  370         if (diff > 2)   /* XXX should be configurable */
  371                 return ENOENT;
  372         va->va_type = vp->v_type;               /* vnode type (for create) */
  373         va->va_flags = 0;                       /* flags defined for file */
  374         if (vp->v_type == VREG) {
  375                 va->va_mode = smp->sm_file_mode; /* files access mode and type */
  376                 if (np->n_dosattr & SMB_FA_RDONLY) {
  377                         va->va_mode &= ~(S_IWUSR|S_IWGRP|S_IWOTH);
  378                         va->va_flags |= UF_READONLY;
  379                 }
  380         } else if (vp->v_type == VDIR) {
  381                 va->va_mode = smp->sm_dir_mode; /* files access mode and type */
  382         } else
  383                 return EINVAL;
  384         va->va_size = np->n_size;
  385         va->va_nlink = 1;               /* number of references to file */
  386         va->va_uid = smp->sm_uid;       /* owner user id */
  387         va->va_gid = smp->sm_gid;       /* owner group id */
  388         va->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0];
  389         va->va_fileid = np->n_ino;      /* file id */
  390         if (va->va_fileid == 0)
  391                 va->va_fileid = 2;
  392         va->va_blocksize = SSTOVC(smp->sm_share)->vc_txmax;
  393         va->va_mtime = np->n_mtime;
  394         va->va_atime = va->va_ctime = va->va_mtime;     /* time file changed */
  395         va->va_gen = VNOVAL;            /* generation number of file */
  396         if (np->n_dosattr & SMB_FA_HIDDEN)
  397                 va->va_flags |= UF_HIDDEN;
  398         if (np->n_dosattr & SMB_FA_SYSTEM)
  399                 va->va_flags |= UF_SYSTEM;
  400         /*
  401          * We don't set the archive bit for directories.
  402          */
  403         if ((vp->v_type != VDIR) && (np->n_dosattr & SMB_FA_ARCHIVE))
  404                 va->va_flags |= UF_ARCHIVE;
  405         va->va_rdev = NODEV;            /* device the special file represents */
  406         va->va_bytes = va->va_size;     /* bytes of disk space held by file */
  407         va->va_filerev = 0;             /* file modification number */
  408         va->va_vaflags = 0;             /* operations flags */
  409         return 0;
  410 }

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