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/nwfs/nwfs_vfsops.c

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    1 /*
    2  * Copyright (c) 1999, 2000 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/nwfs/nwfs_vfsops.c 103936 2002-09-25 02:32:42Z jeff $
   33  */
   34 #include "opt_ncp.h"
   35 #ifndef NCP
   36 #error "NWFS requires NCP protocol"
   37 #endif
   38 
   39 #include <sys/param.h>
   40 #include <sys/systm.h>
   41 #include <sys/proc.h>
   42 #include <sys/kernel.h>
   43 #include <sys/sysctl.h>
   44 #include <sys/vnode.h>
   45 #include <sys/mount.h>
   46 #include <sys/stat.h>
   47 #include <sys/malloc.h>
   48 #include <sys/bio.h>
   49 #include <sys/buf.h>
   50 
   51 #include <netncp/ncp.h>
   52 #include <netncp/ncp_conn.h>
   53 #include <netncp/ncp_subr.h>
   54 #include <netncp/ncp_ncp.h>
   55 #include <netncp/ncp_nls.h>
   56 
   57 #include <fs/nwfs/nwfs.h>
   58 #include <fs/nwfs/nwfs_node.h>
   59 #include <fs/nwfs/nwfs_subr.h>
   60 
   61 int nwfs_debuglevel = 0;
   62 
   63 static int nwfs_version = NWFS_VERSION;
   64 
   65 SYSCTL_DECL(_vfs_nwfs);
   66 SYSCTL_NODE(_vfs, OID_AUTO, nwfs, CTLFLAG_RW, 0, "Netware filesystem");
   67 SYSCTL_INT(_vfs_nwfs, OID_AUTO, version, CTLFLAG_RD, &nwfs_version, 0, "");
   68 SYSCTL_INT(_vfs_nwfs, OID_AUTO, debuglevel, CTLFLAG_RW, &nwfs_debuglevel, 0, "");
   69 
   70 MODULE_DEPEND(nwfs, ncp, 1, 1, 1);
   71 MODULE_DEPEND(nwfs, libmchain, 1, 1, 1);
   72 
   73 static int nwfs_mount(struct mount *, char *, caddr_t,
   74                         struct nameidata *, struct thread *);
   75 static int nwfs_quotactl(struct mount *, int, uid_t, caddr_t, struct thread *);
   76 static int nwfs_root(struct mount *, struct vnode **);
   77 static int nwfs_start(struct mount *, int, struct thread *);
   78 static int nwfs_statfs(struct mount *, struct statfs *, struct thread *);
   79 static int nwfs_sync(struct mount *, int, struct ucred *, struct thread *);
   80 static int nwfs_unmount(struct mount *, int, struct thread *);
   81 static int nwfs_init(struct vfsconf *vfsp);
   82 static int nwfs_uninit(struct vfsconf *vfsp);
   83 
   84 static struct vfsops nwfs_vfsops = {
   85         nwfs_mount,
   86         nwfs_start,
   87         nwfs_unmount,
   88         nwfs_root,
   89         nwfs_quotactl,
   90         nwfs_statfs,
   91         nwfs_sync,
   92         vfs_stdvget,
   93         vfs_stdfhtovp,          /* shouldn't happen */
   94         vfs_stdcheckexp,
   95         vfs_stdvptofh,          /* shouldn't happen */
   96         nwfs_init,
   97         nwfs_uninit,
   98         vfs_stdextattrctl,
   99 };
  100 
  101 
  102 VFS_SET(nwfs_vfsops, nwfs, VFCF_NETWORK);
  103 
  104 int nwfs_pbuf_freecnt = -1;     /* start out unlimited */
  105 static int nwfsid = 1;
  106 
  107 static int
  108 nwfs_initnls(struct nwmount *nmp) {
  109         char    *pc, *pe;
  110         int     error = 0;
  111 #define COPY_TABLE(t,d) { \
  112                 if (t) { \
  113                         error = copyin((t), pc, 256); \
  114                         if (error) break; \
  115                 } else \
  116                         bcopy(d, pc, 256); \
  117                 (t) = pc; pc += 256; \
  118         }
  119 
  120         nmp->m.nls.opt |= NWHP_NLS | NWHP_DOS;
  121         if ((nmp->m.flags & NWFS_MOUNT_HAVE_NLS) == 0) {
  122                 nmp->m.nls.to_lower = ncp_defnls.to_lower;
  123                 nmp->m.nls.to_upper = ncp_defnls.to_upper;
  124                 nmp->m.nls.n2u = ncp_defnls.n2u;
  125                 nmp->m.nls.u2n = ncp_defnls.u2n;
  126                 return 0;
  127         }
  128         MALLOC(pe, char *, 256 * 4, M_NWFSDATA, M_WAITOK);
  129         pc = pe;
  130         do {
  131                 COPY_TABLE(nmp->m.nls.to_lower, ncp_defnls.to_lower);
  132                 COPY_TABLE(nmp->m.nls.to_upper, ncp_defnls.to_upper);
  133                 COPY_TABLE(nmp->m.nls.n2u, ncp_defnls.n2u);
  134                 COPY_TABLE(nmp->m.nls.u2n, ncp_defnls.u2n);
  135         } while(0);
  136         if (error) {
  137                 free(pe, M_NWFSDATA);
  138                 return error;
  139         }
  140         return 0;
  141 }
  142 /*
  143  * mp - path - addr in user space of mount point (ie /usr or whatever)
  144  * data - addr in user space of mount params 
  145  */
  146 static int nwfs_mount(struct mount *mp, char *path, caddr_t data, 
  147                       struct nameidata *ndp, struct thread *td)
  148 {
  149         struct nwfs_args args;    /* will hold data from mount request */
  150         int error;
  151         struct nwmount *nmp = NULL;
  152         struct ncp_conn *conn = NULL;
  153         struct ncp_handle *handle = NULL;
  154         struct vnode *vp;
  155         char *pc,*pe;
  156 
  157         if (data == NULL) {
  158                 nwfs_printf("missing data argument\n");
  159                 return 1;
  160         }
  161         if (mp->mnt_flag & MNT_UPDATE) {
  162                 nwfs_printf("MNT_UPDATE not implemented");
  163                 return (EOPNOTSUPP);
  164         }
  165         error = copyin(data, (caddr_t)&args, sizeof(struct nwfs_args));
  166         if (error)
  167                 return (error);
  168         if (args.version != NWFS_VERSION) {
  169                 nwfs_printf("mount version mismatch: kernel=%d, mount=%d\n",NWFS_VERSION,args.version);
  170                 return (1);
  171         }
  172         error = ncp_conn_getbyref(args.connRef, td , td->td_ucred,NCPM_EXECUTE,&conn);
  173         if (error) {
  174                 nwfs_printf("invalid connection refernce %d\n",args.connRef);
  175                 return (error);
  176         }
  177         error = ncp_conn_gethandle(conn, NULL, &handle);
  178         if (error) {
  179                 nwfs_printf("can't get connection handle\n");
  180                 return (error);
  181         }
  182         ncp_conn_unlock(conn, td);      /* we keep the ref */
  183         mp->mnt_stat.f_iosize = conn->buffer_size;
  184         /* We must malloc our own mount info */
  185         MALLOC(nmp,struct nwmount *,sizeof(struct nwmount),M_NWFSDATA,M_USE_RESERVE | M_ZERO);
  186         if (nmp == NULL) {
  187                 nwfs_printf("could not alloc nwmount\n");
  188                 error = ENOMEM;
  189                 goto bad;
  190         }
  191         mp->mnt_data = (qaddr_t)nmp;
  192         nmp->connh = handle;
  193         nmp->n_root = NULL;
  194         nmp->n_id = nwfsid++;
  195         nmp->m = args;
  196         nmp->m.file_mode = (nmp->m.file_mode &
  197                             (S_IRWXU|S_IRWXG|S_IRWXO)) | S_IFREG;
  198         nmp->m.dir_mode  = (nmp->m.dir_mode &
  199                             (S_IRWXU|S_IRWXG|S_IRWXO)) | S_IFDIR;
  200         if ((error = nwfs_initnls(nmp)) != 0) goto bad;
  201         pc = mp->mnt_stat.f_mntfromname;
  202         pe = pc+sizeof(mp->mnt_stat.f_mntfromname);
  203         bzero(pc, MNAMELEN);
  204         *(pc++) = '/';
  205         pc = index(strncpy(pc, conn->li.server, pe-pc-2),0);
  206         if (pc < pe-1) {
  207                 *(pc++) = ':';
  208                 pc=index(strncpy(pc, conn->li.user, pe-pc-2),0);
  209                 if (pc < pe-1) {
  210                         *(pc++) = '/';
  211                         strncpy(pc, nmp->m.mounted_vol, pe-pc-2);
  212                 }
  213         }
  214         /* protect against invalid mount points */
  215         nmp->m.mount_point[sizeof(nmp->m.mount_point)-1] = '\0';
  216         vfs_getnewfsid(mp);
  217         error = nwfs_root(mp, &vp);
  218         if (error)
  219                 goto bad;
  220         /*
  221          * Lose the lock but keep the ref.
  222          */
  223         VOP_UNLOCK(vp, 0, curthread);
  224         NCPVODEBUG("rootvp.vrefcnt=%d\n",vrefcnt(vp));
  225         return error;
  226 bad:
  227         if (nmp)
  228                 free(nmp, M_NWFSDATA);
  229         if (handle)
  230                 ncp_conn_puthandle(handle, NULL, 0);
  231         return error;
  232 }
  233 
  234 /* Unmount the filesystem described by mp. */
  235 static int
  236 nwfs_unmount(struct mount *mp, int mntflags, struct thread *td)
  237 {
  238         struct nwmount *nmp = VFSTONWFS(mp);
  239         struct ncp_conn *conn;
  240         int error, flags;
  241 
  242         NCPVODEBUG("nwfs_unmount: flags=%04x\n",mntflags);
  243         flags = 0;
  244         if (mntflags & MNT_FORCE)
  245                 flags |= FORCECLOSE;
  246         /* There is 1 extra root vnode reference from nwfs_mount(). */
  247         error = vflush(mp, 1, flags);
  248         if (error)
  249                 return (error);
  250         conn = NWFSTOCONN(nmp);
  251         ncp_conn_puthandle(nmp->connh,NULL,0);
  252         if (ncp_conn_lock(conn, td, td->td_ucred,NCPM_WRITE | NCPM_EXECUTE) == 0) {
  253                 if(ncp_conn_free(conn))
  254                         ncp_conn_unlock(conn, td);
  255         }
  256         mp->mnt_data = (qaddr_t)0;
  257         if (nmp->m.flags & NWFS_MOUNT_HAVE_NLS)
  258                 free(nmp->m.nls.to_lower, M_NWFSDATA);
  259         free(nmp, M_NWFSDATA);
  260         mp->mnt_flag &= ~MNT_LOCAL;
  261         return (error);
  262 }
  263 
  264 /*  Return locked vnode to root of a filesystem */
  265 static int
  266 nwfs_root(struct mount *mp, struct vnode **vpp) {
  267         struct vnode *vp;
  268         struct nwmount *nmp;
  269         struct nwnode *np;
  270         struct ncp_conn *conn;
  271         struct nw_entry_info fattr;
  272         struct thread *td = curthread;
  273         struct ucred *cred =  td->td_ucred;
  274         int error, nsf, opt;
  275         u_char vol;
  276 
  277         nmp = VFSTONWFS(mp);
  278         conn = NWFSTOCONN(nmp);
  279         if (nmp->n_root) {
  280                 *vpp = NWTOV(nmp->n_root);
  281                 while (vget(*vpp, LK_EXCLUSIVE, curthread) != 0)
  282                         ;
  283                 return 0;
  284         }
  285         error = ncp_lookup_volume(conn, nmp->m.mounted_vol, &vol, 
  286                 &nmp->n_rootent.f_id, td, cred);
  287         if (error)
  288                 return ENOENT;
  289         nmp->n_volume = vol;
  290         error = ncp_get_namespaces(conn, vol, &nsf, td, cred);
  291         if (error)
  292                 return ENOENT;
  293         if (nsf & NW_NSB_OS2) {
  294                 NCPVODEBUG("volume %s has os2 namespace\n",nmp->m.mounted_vol);
  295                 if ((nmp->m.flags & NWFS_MOUNT_NO_OS2) == 0) {
  296                         nmp->name_space = NW_NS_OS2;
  297                         nmp->m.nls.opt &= ~NWHP_DOS;
  298                 }
  299         }
  300         opt = nmp->m.nls.opt;
  301         nsf = opt & (NWHP_UPPER | NWHP_LOWER);
  302         if (opt & NWHP_DOS) {
  303                 if (nsf == (NWHP_UPPER | NWHP_LOWER)) {
  304                         nmp->m.nls.opt &= ~(NWHP_LOWER | NWHP_UPPER);
  305                 } else if (nsf == 0) {
  306                         nmp->m.nls.opt |= NWHP_LOWER;
  307                 }
  308         } else {
  309                 if (nsf == (NWHP_UPPER | NWHP_LOWER)) {
  310                         nmp->m.nls.opt &= ~(NWHP_LOWER | NWHP_UPPER);
  311                 }
  312         }
  313         if (nmp->m.root_path[0]) {
  314                 nmp->m.root_path[0]--;
  315                 error = ncp_obtain_info(nmp, nmp->n_rootent.f_id,
  316                     -nmp->m.root_path[0], nmp->m.root_path, &fattr, td, cred);
  317                 if (error) {
  318                         NCPFATAL("Invalid root path specified\n");
  319                         return ENOENT;
  320                 }
  321                 nmp->n_rootent.f_parent = fattr.dirEntNum;
  322                 nmp->m.root_path[0]++;
  323                 error = ncp_obtain_info(nmp, nmp->n_rootent.f_id,
  324                     -nmp->m.root_path[0], nmp->m.root_path, &fattr, td, cred);
  325                 if (error) {
  326                         NCPFATAL("Invalid root path specified\n");
  327                         return ENOENT;
  328                 }
  329                 nmp->n_rootent.f_id = fattr.dirEntNum;
  330         } else {
  331                 error = ncp_obtain_info(nmp, nmp->n_rootent.f_id,
  332                     0, NULL, &fattr, td, cred);
  333                 if (error) {
  334                         NCPFATAL("Can't obtain volume info\n");
  335                         return ENOENT;
  336                 }
  337                 fattr.nameLen = strlen(strcpy(fattr.entryName, "#.ROOT"));
  338                 nmp->n_rootent.f_parent = nmp->n_rootent.f_id;
  339         }
  340         error = nwfs_nget(mp, nmp->n_rootent, &fattr, NULL, &vp);
  341         if (error)
  342                 return (error);
  343         vp->v_vflag |= VV_ROOT;
  344         np = VTONW(vp);
  345         if (nmp->m.root_path[0] == 0)
  346                 np->n_flag |= NVOLUME;
  347         nmp->n_root = np;
  348 /*      error = VOP_GETATTR(vp, &vattr, cred, td);
  349         if (error) {
  350                 vput(vp);
  351                 NCPFATAL("Can't get root directory entry\n");
  352                 return error;
  353         }*/
  354         *vpp = vp;
  355         return (0);
  356 }
  357 
  358 /*
  359  * Vfs start routine, a no-op.
  360  */
  361 /* ARGSUSED */
  362 static int
  363 nwfs_start(mp, flags, td)
  364         struct mount *mp;
  365         int flags;
  366         struct thread *td;
  367 {
  368         NCPVODEBUG("flags=%04x\n",flags);
  369         return (0);
  370 }
  371 
  372 /*
  373  * Do operations associated with quotas, not supported
  374  */
  375 /* ARGSUSED */
  376 static int
  377 nwfs_quotactl(mp, cmd, uid, arg, td)
  378         struct mount *mp;
  379         int cmd;
  380         uid_t uid;
  381         caddr_t arg;
  382         struct thread *td;
  383 {
  384         NCPVODEBUG("return EOPNOTSUPP\n");
  385         return (EOPNOTSUPP);
  386 }
  387 
  388 /*ARGSUSED*/
  389 int
  390 nwfs_init(struct vfsconf *vfsp)
  391 {
  392 #ifndef SMP
  393         int name[2];
  394         int olen, ncpu, plen, error;
  395 
  396         name[0] = CTL_HW;
  397         name[1] = HW_NCPU;
  398         error = kernel_sysctl(curthread, name, 2, &ncpu, &olen, NULL, 0, &plen);
  399         if (error == 0 && ncpu > 1)
  400                 printf("warning: nwfs module compiled without SMP support.");
  401 #endif
  402         nwfs_hash_init();
  403         nwfs_pbuf_freecnt = nswbuf / 2 + 1;
  404         NCPVODEBUG("always happy to load!\n");
  405         return (0);
  406 }
  407 
  408 /*ARGSUSED*/
  409 int
  410 nwfs_uninit(struct vfsconf *vfsp)
  411 {
  412 
  413         nwfs_hash_free();
  414         NCPVODEBUG("unloaded\n");
  415         return (0);
  416 }
  417 
  418 /*
  419  * nwfs_statfs call
  420  */
  421 int
  422 nwfs_statfs(mp, sbp, td)
  423         struct mount *mp;
  424         struct statfs *sbp;
  425         struct thread *td;
  426 {
  427         struct nwmount *nmp = VFSTONWFS(mp);
  428         int error = 0, secsize;
  429         struct nwnode *np = nmp->n_root;
  430         struct ncp_volume_info vi;
  431 
  432         if (np == NULL) return EINVAL;
  433         error = ncp_get_volume_info_with_number(NWFSTOCONN(nmp),
  434             nmp->n_volume, &vi, td, td->td_ucred);
  435         if (error) return error;
  436         secsize = 512;                  /* XXX how to get real value ??? */
  437         sbp->f_spare2=0;                /* placeholder */
  438         /* fundamental filesystem block size */
  439         sbp->f_bsize = vi.sectors_per_block*secsize;
  440         /* optimal transfer block size */
  441         sbp->f_iosize = NWFSTOCONN(nmp)->buffer_size;
  442         /* total data blocks in filesystem */
  443         sbp->f_blocks= vi.total_blocks;
  444         /* free blocks in fs */
  445         sbp->f_bfree = vi.free_blocks + vi.purgeable_blocks;
  446         /* free blocks avail to non-superuser */
  447         sbp->f_bavail= vi.free_blocks+vi.purgeable_blocks;
  448         /* total file nodes in filesystem */
  449         sbp->f_files = vi.total_dir_entries;
  450         /* free file nodes in fs */
  451         sbp->f_ffree = vi.available_dir_entries;
  452         sbp->f_flags = 0;               /* copy of mount exported flags */
  453         if (sbp != &mp->mnt_stat) {
  454                 sbp->f_fsid = mp->mnt_stat.f_fsid;      /* filesystem id */
  455                 sbp->f_owner = mp->mnt_stat.f_owner;    /* user that mounted the filesystem */
  456                 sbp->f_type = mp->mnt_vfc->vfc_typenum; /* type of filesystem */
  457                 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN);
  458                 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
  459         }
  460         strncpy(sbp->f_fstypename, mp->mnt_vfc->vfc_name, MFSNAMELEN);
  461         return 0;
  462 }
  463 
  464 /*
  465  * Flush out the buffer cache
  466  */
  467 /* ARGSUSED */
  468 static int
  469 nwfs_sync(mp, waitfor, cred, td)
  470         struct mount *mp;
  471         int waitfor;
  472         struct ucred *cred;
  473         struct thread *td;
  474 {
  475         struct vnode *vp, *nvp;
  476         int error, allerror = 0;
  477         /*
  478          * Force stale buffer cache information to be flushed.
  479          */
  480         mtx_lock(&mntvnode_mtx);
  481 loop:
  482         for (vp = TAILQ_FIRST(&mp->mnt_nvnodelist);
  483              vp != NULL;
  484              vp = nvp) {
  485                 /*
  486                  * If the vnode that we are about to sync is no longer
  487                  * associated with this mount point, start over.
  488                  */
  489                 if (vp->v_mount != mp)
  490                         goto loop;
  491                 nvp = TAILQ_NEXT(vp, v_nmntvnodes);
  492                 mtx_unlock(&mntvnode_mtx);
  493                 VI_LOCK(vp);
  494                 if (VOP_ISLOCKED(vp, NULL) || TAILQ_EMPTY(&vp->v_dirtyblkhd) ||
  495                     waitfor == MNT_LAZY) {
  496                         VI_UNLOCK(vp);
  497                         mtx_lock(&mntvnode_mtx);
  498                         continue;
  499                 }
  500                 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, td)) {
  501                         mtx_lock(&mntvnode_mtx);
  502                         goto loop;
  503                 }
  504                 error = VOP_FSYNC(vp, cred, waitfor, td);
  505                 if (error)
  506                         allerror = error;
  507                 vput(vp);
  508                 mtx_lock(&mntvnode_mtx);
  509         }
  510         mtx_unlock(&mntvnode_mtx);
  511         return (allerror);
  512 }

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