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| Current File : //usr/src/contrib/amd/amd/nfs_subr.c |
/*
* Copyright (c) 1997-2006 Erez Zadok
* Copyright (c) 1990 Jan-Simon Pendry
* Copyright (c) 1990 Imperial College of Science, Technology & Medicine
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Jan-Simon Pendry at Imperial College, London.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgment:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*
* File: am-utils/amd/nfs_subr.c
*
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif /* HAVE_CONFIG_H */
#include <am_defs.h>
#include <amd.h>
/*
* Convert from UN*X to NFS error code.
* Some systems like linux define their own (see
* conf/mount/mount_linux.h).
*/
#ifndef nfs_error
# define nfs_error(e) ((nfsstat)(e))
#endif /* nfs_error */
/*
* File Handle structure
*
* This is interpreted by indexing the exported array
* by fhh_id (for old-style filehandles), or by retrieving
* the node name from fhh_path (for new-style filehandles).
*
* The whole structure is mapped onto a standard fhandle_t
* when transmitted.
*/
struct am_fh {
u_int fhh_gen; /* generation number */
union {
struct {
int fhh_type; /* old or new am_fh */
pid_t fhh_pid; /* process id */
int fhh_id; /* map id */
} s;
char fhh_path[NFS_FHSIZE-sizeof(u_int)]; /* path to am_node */
} u;
};
/* forward declarations */
/* converting am-filehandles to mount-points */
static am_node *fh_to_mp3(am_nfs_fh *fhp, int *rp, int vop);
static am_node *fh_to_mp(am_nfs_fh *fhp);
static void count_map_entries(const am_node *mp, u_int *out_blocks, u_int *out_bfree, u_int *out_bavail);
static char *
do_readlink(am_node *mp, int *error_return)
{
char *ln;
/*
* If there is a readlink method then use it,
* otherwise if a link exists use that,
* otherwise use the mount point.
*/
if (mp->am_mnt->mf_ops->readlink) {
int retry = 0;
mp = (*mp->am_mnt->mf_ops->readlink) (mp, &retry);
if (mp == 0) {
*error_return = retry;
return 0;
}
/* reschedule_timeout_mp(); */
}
if (mp->am_link) {
ln = mp->am_link;
} else {
ln = mp->am_mnt->mf_mount;
}
return ln;
}
voidp
nfsproc_null_2_svc(voidp argp, struct svc_req *rqstp)
{
static char res;
return (voidp) &res;
}
nfsattrstat *
nfsproc_getattr_2_svc(am_nfs_fh *argp, struct svc_req *rqstp)
{
static nfsattrstat res;
am_node *mp;
int retry;
time_t now = clocktime(NULL);
if (amuDebug(D_TRACE))
plog(XLOG_DEBUG, "getattr:");
mp = fh_to_mp3(argp, &retry, VLOOK_CREATE);
if (mp == 0) {
if (amuDebug(D_TRACE))
plog(XLOG_DEBUG, "\tretry=%d", retry);
if (retry < 0) {
amd_stats.d_drops++;
return 0;
}
res.ns_status = nfs_error(retry);
return &res;
}
res = mp->am_attr;
if (amuDebug(D_TRACE))
plog(XLOG_DEBUG, "\tstat(%s), size = %d, mtime=%ld.%ld",
mp->am_path,
(int) res.ns_u.ns_attr_u.na_size,
(long) res.ns_u.ns_attr_u.na_mtime.nt_seconds,
(long) res.ns_u.ns_attr_u.na_mtime.nt_useconds);
/* Delay unmount of what was looked up */
if (mp->am_timeo_w < 4 * gopt.am_timeo_w)
mp->am_timeo_w += gopt.am_timeo_w;
mp->am_ttl = now + mp->am_timeo_w;
mp->am_stats.s_getattr++;
return &res;
}
nfsattrstat *
nfsproc_setattr_2_svc(nfssattrargs *argp, struct svc_req *rqstp)
{
static nfsattrstat res;
if (!fh_to_mp(&argp->sag_fhandle))
res.ns_status = nfs_error(ESTALE);
else
res.ns_status = nfs_error(EROFS);
return &res;
}
voidp
nfsproc_root_2_svc(voidp argp, struct svc_req *rqstp)
{
static char res;
return (voidp) &res;
}
nfsdiropres *
nfsproc_lookup_2_svc(nfsdiropargs *argp, struct svc_req *rqstp)
{
static nfsdiropres res;
am_node *mp;
int retry;
uid_t uid;
gid_t gid;
if (amuDebug(D_TRACE))
plog(XLOG_DEBUG, "lookup:");
/* finally, find the effective uid/gid from RPC request */
if (getcreds(rqstp, &uid, &gid, nfsxprt) < 0)
plog(XLOG_ERROR, "cannot get uid/gid from RPC credentials");
xsnprintf(opt_uid, sizeof(uid_str), "%d", (int) uid);
xsnprintf(opt_gid, sizeof(gid_str), "%d", (int) gid);
mp = fh_to_mp3(&argp->da_fhandle, &retry, VLOOK_CREATE);
if (mp == 0) {
if (retry < 0) {
amd_stats.d_drops++;
return 0;
}
res.dr_status = nfs_error(retry);
} else {
int error;
am_node *ap;
if (amuDebug(D_TRACE))
plog(XLOG_DEBUG, "\tlookup(%s, %s)", mp->am_path, argp->da_name);
ap = mp->am_mnt->mf_ops->lookup_child(mp, argp->da_name, &error, VLOOK_CREATE);
if (ap && error < 0)
ap = mp->am_mnt->mf_ops->mount_child(ap, &error);
if (ap == 0) {
if (error < 0) {
amd_stats.d_drops++;
return 0;
}
res.dr_status = nfs_error(error);
} else {
/*
* XXX: EXPERIMENTAL! Delay unmount of what was looked up. This
* should reduce the chance for race condition between unmounting an
* entry synchronously, and re-mounting it asynchronously.
*/
if (ap->am_ttl < mp->am_ttl)
ap->am_ttl = mp->am_ttl;
mp_to_fh(ap, &res.dr_u.dr_drok_u.drok_fhandle);
res.dr_u.dr_drok_u.drok_attributes = ap->am_fattr;
res.dr_status = NFS_OK;
}
mp->am_stats.s_lookup++;
/* reschedule_timeout_mp(); */
}
return &res;
}
void
nfs_quick_reply(am_node *mp, int error)
{
SVCXPRT *transp = mp->am_transp;
nfsdiropres res;
xdrproc_t xdr_result = (xdrproc_t) xdr_diropres;
/*
* If there's a transp structure then we can reply to the client's
* nfs lookup request.
*/
if (transp) {
if (error == 0) {
/*
* Construct a valid reply to a lookup request. Same
* code as in nfsproc_lookup_2_svc() above.
*/
mp_to_fh(mp, &res.dr_u.dr_drok_u.drok_fhandle);
res.dr_u.dr_drok_u.drok_attributes = mp->am_fattr;
res.dr_status = NFS_OK;
} else
/*
* Return the error that was passed to us.
*/
res.dr_status = nfs_error(error);
/*
* Send off our reply
*/
if (!svc_sendreply(transp, (XDRPROC_T_TYPE) xdr_result, (SVC_IN_ARG_TYPE) & res))
svcerr_systemerr(transp);
/*
* Free up transp. It's only used for one reply.
*/
XFREE(mp->am_transp);
dlog("Quick reply sent for %s", mp->am_mnt->mf_mount);
}
}
nfsreadlinkres *
nfsproc_readlink_2_svc(am_nfs_fh *argp, struct svc_req *rqstp)
{
static nfsreadlinkres res;
am_node *mp;
int retry;
if (amuDebug(D_TRACE))
plog(XLOG_DEBUG, "readlink:");
mp = fh_to_mp3(argp, &retry, VLOOK_CREATE);
if (mp == 0) {
readlink_retry:
if (retry < 0) {
amd_stats.d_drops++;
return 0;
}
res.rlr_status = nfs_error(retry);
} else {
char *ln = do_readlink(mp, &retry);
if (ln == 0)
goto readlink_retry;
res.rlr_status = NFS_OK;
if (amuDebug(D_TRACE) && ln)
plog(XLOG_DEBUG, "\treadlink(%s) = %s", mp->am_path, ln);
res.rlr_u.rlr_data_u = ln;
mp->am_stats.s_readlink++;
}
return &res;
}
nfsreadres *
nfsproc_read_2_svc(nfsreadargs *argp, struct svc_req *rqstp)
{
static nfsreadres res;
memset((char *) &res, 0, sizeof(res));
res.rr_status = nfs_error(EACCES);
return &res;
}
voidp
nfsproc_writecache_2_svc(voidp argp, struct svc_req *rqstp)
{
static char res;
return (voidp) &res;
}
nfsattrstat *
nfsproc_write_2_svc(nfswriteargs *argp, struct svc_req *rqstp)
{
static nfsattrstat res;
if (!fh_to_mp(&argp->wra_fhandle))
res.ns_status = nfs_error(ESTALE);
else
res.ns_status = nfs_error(EROFS);
return &res;
}
nfsdiropres *
nfsproc_create_2_svc(nfscreateargs *argp, struct svc_req *rqstp)
{
static nfsdiropres res;
if (!fh_to_mp(&argp->ca_where.da_fhandle))
res.dr_status = nfs_error(ESTALE);
else
res.dr_status = nfs_error(EROFS);
return &res;
}
static nfsstat *
unlink_or_rmdir(nfsdiropargs *argp, struct svc_req *rqstp, int unlinkp)
{
static nfsstat res;
int retry;
am_node *mp = fh_to_mp3(&argp->da_fhandle, &retry, VLOOK_DELETE);
if (mp == 0) {
if (retry < 0) {
amd_stats.d_drops++;
return 0;
}
res = nfs_error(retry);
goto out;
}
if (mp->am_fattr.na_type != NFDIR) {
res = nfs_error(ENOTDIR);
goto out;
}
if (amuDebug(D_TRACE))
plog(XLOG_DEBUG, "\tremove(%s, %s)", mp->am_path, argp->da_name);
mp = mp->am_mnt->mf_ops->lookup_child(mp, argp->da_name, &retry, VLOOK_DELETE);
if (mp == 0) {
/*
* Ignore retries...
*/
if (retry < 0)
retry = 0;
/*
* Usual NFS workaround...
*/
else if (retry == ENOENT)
retry = 0;
res = nfs_error(retry);
} else {
forcibly_timeout_mp(mp);
res = NFS_OK;
}
out:
return &res;
}
nfsstat *
nfsproc_remove_2_svc(nfsdiropargs *argp, struct svc_req *rqstp)
{
return unlink_or_rmdir(argp, rqstp, TRUE);
}
nfsstat *
nfsproc_rename_2_svc(nfsrenameargs *argp, struct svc_req *rqstp)
{
static nfsstat res;
if (!fh_to_mp(&argp->rna_from.da_fhandle) || !fh_to_mp(&argp->rna_to.da_fhandle))
res = nfs_error(ESTALE);
/*
* If the kernel is doing clever things with referenced files
* then let it pretend...
*/
else if (NSTREQ(argp->rna_to.da_name, ".nfs", 4))
res = NFS_OK;
/*
* otherwise a failure
*/
else
res = nfs_error(EROFS);
return &res;
}
nfsstat *
nfsproc_link_2_svc(nfslinkargs *argp, struct svc_req *rqstp)
{
static nfsstat res;
if (!fh_to_mp(&argp->la_fhandle) || !fh_to_mp(&argp->la_to.da_fhandle))
res = nfs_error(ESTALE);
else
res = nfs_error(EROFS);
return &res;
}
nfsstat *
nfsproc_symlink_2_svc(nfssymlinkargs *argp, struct svc_req *rqstp)
{
static nfsstat res;
if (!fh_to_mp(&argp->sla_from.da_fhandle))
res = nfs_error(ESTALE);
else
res = nfs_error(EROFS);
return &res;
}
nfsdiropres *
nfsproc_mkdir_2_svc(nfscreateargs *argp, struct svc_req *rqstp)
{
static nfsdiropres res;
if (!fh_to_mp(&argp->ca_where.da_fhandle))
res.dr_status = nfs_error(ESTALE);
else
res.dr_status = nfs_error(EROFS);
return &res;
}
nfsstat *
nfsproc_rmdir_2_svc(nfsdiropargs *argp, struct svc_req *rqstp)
{
return unlink_or_rmdir(argp, rqstp, FALSE);
}
nfsreaddirres *
nfsproc_readdir_2_svc(nfsreaddirargs *argp, struct svc_req *rqstp)
{
static nfsreaddirres res;
static nfsentry e_res[MAX_READDIR_ENTRIES];
am_node *mp;
int retry;
if (amuDebug(D_TRACE))
plog(XLOG_DEBUG, "readdir:");
mp = fh_to_mp3(&argp->rda_fhandle, &retry, VLOOK_CREATE);
if (mp == 0) {
if (retry < 0) {
amd_stats.d_drops++;
return 0;
}
res.rdr_status = nfs_error(retry);
} else {
if (amuDebug(D_TRACE))
plog(XLOG_DEBUG, "\treaddir(%s)", mp->am_path);
res.rdr_status = nfs_error((*mp->am_mnt->mf_ops->readdir)
(mp, argp->rda_cookie,
&res.rdr_u.rdr_reply_u, e_res, argp->rda_count));
mp->am_stats.s_readdir++;
}
return &res;
}
nfsstatfsres *
nfsproc_statfs_2_svc(am_nfs_fh *argp, struct svc_req *rqstp)
{
static nfsstatfsres res;
am_node *mp;
int retry;
mntent_t mnt;
if (amuDebug(D_TRACE))
plog(XLOG_DEBUG, "statfs:");
mp = fh_to_mp3(argp, &retry, VLOOK_CREATE);
if (mp == 0) {
if (retry < 0) {
amd_stats.d_drops++;
return 0;
}
res.sfr_status = nfs_error(retry);
} else {
nfsstatfsokres *fp;
if (amuDebug(D_TRACE))
plog(XLOG_DEBUG, "\tstat_fs(%s)", mp->am_path);
/*
* just return faked up file system information
*/
fp = &res.sfr_u.sfr_reply_u;
fp->sfrok_tsize = 1024;
fp->sfrok_bsize = 1024;
/* check if map is browsable and show_statfs_entries=yes */
if ((gopt.flags & CFM_SHOW_STATFS_ENTRIES) &&
mp->am_mnt && mp->am_mnt->mf_mopts) {
mnt.mnt_opts = mp->am_mnt->mf_mopts;
if (amu_hasmntopt(&mnt, "browsable")) {
count_map_entries(mp,
&fp->sfrok_blocks,
&fp->sfrok_bfree,
&fp->sfrok_bavail);
}
} else {
fp->sfrok_blocks = 0; /* set to 1 if you don't want empty automounts */
fp->sfrok_bfree = 0;
fp->sfrok_bavail = 0;
}
res.sfr_status = NFS_OK;
mp->am_stats.s_statfs++;
}
return &res;
}
/*
* count how many total entries there are in a map, and how many
* of them are in use.
*/
static void
count_map_entries(const am_node *mp, u_int *out_blocks, u_int *out_bfree, u_int *out_bavail)
{
u_int blocks, bfree, bavail, i;
mntfs *mf;
mnt_map *mmp;
kv *k;
blocks = bfree = bavail = 0;
if (!mp)
goto out;
mf = mp->am_mnt;
if (!mf)
goto out;
mmp = (mnt_map *) mf->mf_private;
if (!mmp)
goto out;
/* iterate over keys */
for (i = 0; i < NKVHASH; i++) {
for (k = mmp->kvhash[i]; k ; k = k->next) {
if (!k->key)
continue;
blocks++;
/*
* XXX: Need to count how many are actively in use and recompute
* bfree and bavail based on it.
*/
}
}
out:
*out_blocks = blocks;
*out_bfree = bfree;
*out_bavail = bavail;
}
/*
* Convert from file handle to automount node.
*/
static am_node *
fh_to_mp3(am_nfs_fh *fhp, int *rp, int vop)
{
struct am_fh *fp = (struct am_fh *) fhp;
am_node *ap = 0;
if (fp->u.s.fhh_type != 0) {
/* New filehandle type */
int len = sizeof(*fhp) - sizeof(fp->fhh_gen);
char *path = xmalloc(len+1);
/*
* Because fhp is treated as a filehandle we use memcpy
* instead of xstrlcpy.
*/
memcpy(path, (char *) fp->u.fhh_path, len);
path[len] = '\0';
/* dlog("fh_to_mp3: new filehandle: %s", path); */
ap = path_to_exported_ap(path);
XFREE(path);
} else {
/* dlog("fh_to_mp3: old filehandle: %d", fp->u.s.fhh_id); */
/*
* Check process id matches
* If it doesn't then it is probably
* from an old kernel-cached filehandle
* which is now out of date.
*/
if (fp->u.s.fhh_pid != get_server_pid()) {
dlog("fh_to_mp3: wrong pid %ld != my pid %ld",
(long) fp->u.s.fhh_pid, get_server_pid());
goto drop;
}
/*
* Get hold of the supposed mount node
*/
ap = get_exported_ap(fp->u.s.fhh_id);
}
/*
* Check the generation number in the node
* matches the one from the kernel. If not
* then the old node has been timed out and
* a new one allocated.
*/
if (ap != NULL && ap->am_gen != fp->fhh_gen)
ap = 0;
/*
* If it doesn't exists then drop the request
*/
if (!ap)
goto drop;
#if 0
/*
* If the node is hung then locate a new node
* for it. This implements the replicated filesystem
* retries.
*/
if (ap->am_mnt && FSRV_ISDOWN(ap->am_mnt->mf_server) && ap->am_parent) {
int error;
am_node *orig_ap = ap;
dlog("fh_to_mp3: %s (%s) is hung: lookup alternative file server",
orig_ap->am_path, orig_ap->am_mnt->mf_info);
/*
* Update modify time of parent node.
* With any luck the kernel will re-stat
* the child node and get new information.
*/
clocktime(&orig_ap->am_fattr.na_mtime);
/*
* Call the parent's lookup routine for an object
* with the same name. This may return -1 in error
* if a mount is in progress. In any case, if no
* mount node is returned the error code is propagated
* to the caller.
*/
if (vop == VLOOK_CREATE) {
ap = orig_ap->am_parent->am_mnt->mf_ops->lookup_child(orig_ap->am_parent, orig_ap->am_name, &error, vop);
if (ap && error < 0)
ap = orig_ap->am_parent->am_mnt->mf_ops->mount_child(ap, &error);
} else {
ap = 0;
error = ESTALE;
}
if (ap == 0) {
if (error < 0 && amd_state == Finishing)
error = ENOENT;
*rp = error;
return 0;
}
/*
* Update last access to original node. This
* avoids timing it out and so sending ESTALE
* back to the kernel.
* XXX - Not sure we need this anymore (jsp, 90/10/6).
*/
new_ttl(orig_ap);
}
#endif
/*
* Disallow references to objects being unmounted, unless
* they are automount points.
*/
if (ap->am_mnt && (ap->am_mnt->mf_flags & MFF_UNMOUNTING) &&
!(ap->am_flags & AMF_ROOT)) {
if (amd_state == Finishing)
*rp = ENOENT;
else
*rp = -1;
return 0;
}
new_ttl(ap);
drop:
if (!ap || !ap->am_mnt) {
/*
* If we are shutting down then it is likely
* that this node has disappeared because of
* a fast timeout. To avoid things thrashing
* just pretend it doesn't exist at all. If
* ESTALE is returned, some NFS clients just
* keep retrying (stupid or what - if it's
* stale now, what's it going to be in 5 minutes?)
*/
if (amd_state == Finishing)
*rp = ENOENT;
else
*rp = ESTALE;
amd_stats.d_stale++;
}
return ap;
}
static am_node *
fh_to_mp(am_nfs_fh *fhp)
{
int dummy;
return fh_to_mp3(fhp, &dummy, VLOOK_CREATE);
}
/*
* Convert from automount node to file handle.
*/
void
mp_to_fh(am_node *mp, am_nfs_fh *fhp)
{
u_int pathlen;
struct am_fh *fp = (struct am_fh *) fhp;
memset((char *) fhp, 0, sizeof(am_nfs_fh));
/* Store the generation number */
fp->fhh_gen = mp->am_gen;
pathlen = strlen(mp->am_path);
if (pathlen <= sizeof(*fhp) - sizeof(fp->fhh_gen)) {
/* dlog("mp_to_fh: new filehandle: %s", mp->am_path); */
/*
* Because fhp is treated as a filehandle we use memcpy instead of
* xstrlcpy.
*/
memcpy(fp->u.fhh_path, mp->am_path, pathlen); /* making a filehandle */
} else {
/*
* Take the process id
*/
fp->u.s.fhh_pid = get_server_pid();
/*
* ... the map number
*/
fp->u.s.fhh_id = mp->am_mapno;
/*
* ... and the generation number (previously stored)
* to make a "unique" triple that will never
* be reallocated except across reboots (which doesn't matter)
* or if we are unlucky enough to be given the same
* pid as a previous amd (very unlikely).
*/
/* dlog("mp_to_fh: old filehandle: %d", fp->u.s.fhh_id); */
}
}