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nfs.c
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nfs.c
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/*
* UNFS3 NFS protocol procedures
* (C) 2004, Pascal Schmidt
* Copyright 2014 Karl Mikaelsson <derfian@cendio.se> for Cendio AB
* see file LICENSE for license details
*/
#include "config.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/param.h> /* needed for statfs() on NetBSD */
#ifdef HAVE_SYS_MOUNT_H
#include <sys/mount.h> /* dito */
#endif
#ifdef HAVE_SYS_VMOUNT_H
#include <sys/vmount.h> /* AIX */
#endif
#include <rpc/rpc.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <utime.h>
#ifndef WIN32
#include <sys/socket.h>
#include <sys/un.h>
#endif /* WIN32 */
#if HAVE_STATVFS == 1
# include <sys/statvfs.h>
#else
# define statvfs statfs
#endif
#include "nfs.h"
#include "mount.h"
#include "fh.h"
#include "fh_cache.h"
#include "attr.h"
#include "readdir.h"
#include "user.h"
#include "error.h"
#include "fd_cache.h"
#include "daemon.h"
#include "backend.h"
#include "Config/exports.h"
#include "Extras/cluster.h"
/*
* decompose filehandle and switch user if permitted access
* otherwise zero result structure and return with error status
*/
#define PREP(p,f) do { \
unfs3_fh_t fh = fh_decode(&f); \
switch_to_root(); \
p = fh_decomp(f); \
if (exports_options(p, rqstp, NULL, NULL) == -1) { \
memset(&result, 0, sizeof(result)); \
if (p) \
result.status = NFS3ERR_ACCES; \
else \
result.status = NFS3ERR_STALE; \
return &result; \
} \
if (fh.pwhash != export_password_hash) { \
memset(&result, 0, sizeof(result)); \
result.status = NFS3ERR_STALE; \
return &result; \
} \
switch_user(rqstp); \
} while (0)
/*
* cat an object name onto a path, checking for illegal input
*/
nfsstat3 cat_name(const char *path, const char *name, char *result)
{
char *last;
if (!path)
return NFS3ERR_STALE;
if (!name)
return NFS3ERR_ACCES;
if (name[0] == 0 || strchr(name, '/') != NULL)
return NFS3ERR_ACCES;
if (strlen(path) + strlen(name) + 2 > NFS_MAXPATHLEN)
return NFS3ERR_NAMETOOLONG;
if (strcmp(name, ".") == 0) {
strcpy(result, path);
return NFS3_OK;
}
/*
* Irix clients do lookups for .. and then use the
* resulting filehandle for more lookups, causing them
* to get filehandles that fh_decomp_raw will refuse to
* resolve. Export list handling will also get very
* confused if we allow such filehandles.
*/
if (strcmp(name, "..") == 0) {
last = strrchr(path, '/');
if (!last || last == path)
strcpy(result, "/");
else {
*last = 0;
strcpy(result, path);
*last = '/';
}
return NFS3_OK;
}
sprintf(result, "%s/%s", path, name);
return NFS3_OK;
}
void *nfsproc3_null_3_svc(U(void *argp), U(struct svc_req *rqstp))
{
static void *result = NULL;
return &result;
}
GETATTR3res *nfsproc3_getattr_3_svc(GETATTR3args * argp,
struct svc_req * rqstp)
{
static GETATTR3res result;
char *path;
post_op_attr post;
PREP(path, argp->object);
post = get_post_cached(rqstp);
result.status = NFS3_OK;
result.GETATTR3res_u.resok.obj_attributes =
post.post_op_attr_u.attributes;
return &result;
}
/*
* check ctime guard for SETATTR procedure
*/
static nfsstat3 in_sync(sattrguard3 guard, pre_op_attr pre)
{
if (!pre.attributes_follow)
return NFS3ERR_STALE;
if (!guard.check)
return NFS3_OK;
if (guard.sattrguard3_u.obj_ctime.seconds !=
pre.pre_op_attr_u.attributes.ctime.seconds)
return NFS3ERR_NOT_SYNC;
return NFS3_OK;
}
SETATTR3res *nfsproc3_setattr_3_svc(SETATTR3args * argp,
struct svc_req * rqstp)
{
static SETATTR3res result;
pre_op_attr pre;
char *path;
PREP(path, argp->object);
pre = get_pre_cached();
result.status = join(in_sync(argp->guard, pre), exports_rw());
if (result.status == NFS3_OK)
result.status = set_attr(path, argp->object, argp->new_attributes);
/* overlaps with resfail */
result.SETATTR3res_u.resok.obj_wcc.before = pre;
result.SETATTR3res_u.resok.obj_wcc.after = get_post_stat(path, rqstp);
return &result;
}
LOOKUP3res *nfsproc3_lookup_3_svc(LOOKUP3args * argp, struct svc_req * rqstp)
{
static LOOKUP3res result;
unfs3_fh_t *fh;
static char fhbuf[FH_MAXBUF];
char *path;
char obj[NFS_MAXPATHLEN];
backend_statstruct buf;
int res;
uint32 gen;
PREP(path, argp->what.dir);
result.status = cat_name(path, argp->what.name, obj);
cluster_lookup(obj, rqstp, &result.status);
if (result.status == NFS3_OK) {
res = backend_lstat(obj, &buf);
if (res == -1)
result.status = lookup_err();
else {
if (strcmp(argp->what.name, ".") == 0 ||
strcmp(argp->what.name, "..") == 0) {
fh = fh_comp_ptr(obj, rqstp, 0);
} else {
gen = backend_get_gen(buf, FD_NONE, obj);
fh = fh_extend(argp->what.dir, buf.st_dev, buf.st_ino, gen);
fh_cache_add(buf.st_dev, buf.st_ino, obj);
}
if (fh) {
result.LOOKUP3res_u.resok.object = fh_encode(fh, fhbuf);
fix_dir_times(obj, &buf);
result.LOOKUP3res_u.resok.obj_attributes =
get_post_buf(buf, rqstp);
} else {
/* path was too long */
result.status = NFS3ERR_NAMETOOLONG;
}
}
}
/* overlaps with resfail */
result.LOOKUP3res_u.resok.dir_attributes = get_post_stat(path, rqstp);
return &result;
}
ACCESS3res *nfsproc3_access_3_svc(ACCESS3args * argp, struct svc_req * rqstp)
{
static ACCESS3res result;
char *path;
post_op_attr post;
mode_t mode;
int newaccess = 0;
PREP(path, argp->object);
post = get_post_cached(rqstp);
mode = post.post_op_attr_u.attributes.mode;
if (access(path, R_OK) != -1)
newaccess |= ACCESS3_READ;
if (access(path, W_OK) != -1)
newaccess |= ACCESS3_MODIFY | ACCESS3_EXTEND;
if (access(path, X_OK) != -1) {
newaccess |= ACCESS3_EXECUTE;
if (opt_readable_executables)
newaccess |= ACCESS3_READ;
}
/* root is allowed everything */
if (get_uid(rqstp) == 0)
newaccess |= ACCESS3_READ | ACCESS3_MODIFY | ACCESS3_EXTEND;
/* adjust if directory */
if (post.post_op_attr_u.attributes.type == NF3DIR) {
if (newaccess & (ACCESS3_READ | ACCESS3_EXECUTE))
newaccess |= ACCESS3_LOOKUP;
if (newaccess & ACCESS3_MODIFY)
newaccess |= ACCESS3_DELETE;
newaccess &= ~ACCESS3_EXECUTE;
}
result.status = NFS3_OK;
result.ACCESS3res_u.resok.access = newaccess & argp->access;
result.ACCESS3res_u.resok.obj_attributes = post;
return &result;
}
READLINK3res *nfsproc3_readlink_3_svc(READLINK3args * argp,
struct svc_req * rqstp)
{
static READLINK3res result;
char *path;
static char buf[NFS_MAXPATHLEN];
int res;
PREP(path, argp->symlink);
res = backend_readlink(path, buf, NFS_MAXPATHLEN - 1);
if (res == -1)
result.status = readlink_err();
else {
/* readlink does not NULL-terminate */
buf[res] = 0;
result.status = NFS3_OK;
result.READLINK3res_u.resok.data = buf;
}
/* overlaps with resfail */
result.READLINK3res_u.resok.symlink_attributes =
get_post_stat(path, rqstp);
return &result;
}
READ3res *nfsproc3_read_3_svc(READ3args * argp, struct svc_req * rqstp)
{
static READ3res result;
char *path;
int fd, res;
static char buf[NFS_MAXDATA_TCP + 1];
unsigned int maxdata;
if (get_socket_type(rqstp) == SOCK_STREAM)
maxdata = NFS_MAXDATA_TCP;
else
maxdata = NFS_MAXDATA_UDP;
PREP(path, argp->file);
result.status = is_reg();
/* handle reading of executables */
read_executable(rqstp, st_cache);
/* handle read of owned files */
read_by_owner(rqstp, st_cache);
/* if bigger than rtmax, truncate length */
if (argp->count > maxdata)
argp->count = maxdata;
if (result.status == NFS3_OK) {
fd = fd_open(path, argp->file, UNFS3_FD_READ, TRUE);
if (fd != -1) {
/* read one more to check for eof */
res = backend_pread(fd, buf, argp->count + 1, (off64_t)argp->offset);
/* eof if we could not read one more */
result.READ3res_u.resok.eof = (res <= (int64) argp->count);
/* close for real when hitting eof */
if (result.READ3res_u.resok.eof)
fd_close(fd, UNFS3_FD_READ, FD_CLOSE_REAL);
else {
fd_close(fd, UNFS3_FD_READ, FD_CLOSE_VIRT);
res--;
}
if (res >= 0) {
result.READ3res_u.resok.count = res;
result.READ3res_u.resok.data.data_len = res;
result.READ3res_u.resok.data.data_val = buf;
} else {
/* error during read() */
/* EINVAL means unreadable object */
if (errno == EINVAL)
result.status = NFS3ERR_INVAL;
else
result.status = NFS3ERR_IO;
}
} else
/* opening for read failed */
result.status = read_err();
}
/* overlaps with resfail */
result.READ3res_u.resok.file_attributes = get_post_stat(path, rqstp);
return &result;
}
WRITE3res *nfsproc3_write_3_svc(WRITE3args * argp, struct svc_req * rqstp)
{
static WRITE3res result;
char *path;
int fd, res, res_close;
PREP(path, argp->file);
result.status = join(is_reg(), exports_rw());
/* handle write of owned files */
write_by_owner(rqstp, st_cache);
if (result.status == NFS3_OK) {
/* We allow caching of the fd only for unstable writes. This is to
prevent generating a new write verifier for failed stable writes,
when the fd was not in the cache. Besides, for stable writes, the
fd will be removed from the cache by fd_close() below, so adding
it to and removing it from the cache is just a waste of CPU cycles
*/
fd = fd_open(path, argp->file, UNFS3_FD_WRITE,
(argp->stable == UNSTABLE));
if (fd != -1) {
res =
backend_pwrite(fd, argp->data.data_val, argp->data.data_len,
(off64_t)argp->offset);
/* close for real if not UNSTABLE write */
if (argp->stable == UNSTABLE)
res_close = fd_close(fd, UNFS3_FD_WRITE, FD_CLOSE_VIRT);
else
res_close = fd_close(fd, UNFS3_FD_WRITE, FD_CLOSE_REAL);
/* we always do fsync(), never fdatasync() */
if (argp->stable == DATA_SYNC)
argp->stable = FILE_SYNC;
if (res != -1 && res_close != -1) {
result.WRITE3res_u.resok.count = res;
result.WRITE3res_u.resok.committed = argp->stable;
memcpy(result.WRITE3res_u.resok.verf, wverf,
NFS3_WRITEVERFSIZE);
} else {
/* error during write or close */
result.status = write_write_err();
}
} else
/* could not open for writing */
result.status = write_open_err();
}
/* overlaps with resfail */
result.WRITE3res_u.resok.file_wcc.before = get_pre_cached();
result.WRITE3res_u.resok.file_wcc.after = get_post_stat(path, rqstp);
return &result;
}
/* seconds between 1970-01-01 and 1980-01-01 */
static const unsigned FT80SEC = 315532800;
/*
* store verifier in atime and mtime
*/
static int store_create_verifier(char *obj, createverf3 verf)
{
char hashbuf[9];
uint32 hash;
struct utimbuf ubuf;
/* FAT has a very limited number of bits for file times, so we hash
the verifier down to 32 bits to be able to fit it in. This
increases the risk of collisions a bit, but we should hopefully
not have the kind of load where this is a problem. */
memcpy(hashbuf, verf, 8);
hashbuf[8] = '\0';
hash = fnv1a_32(hashbuf);
/* FAT can only store dates in the interval 1980-01-01 to 2107-12-31.
However, since the utime interface uses Epoch time, we are further
limited to 1980-01-01 to 2038-01-19, assuming 32 bit signed time_t.
math.log(2**31-1 - FT80SEC, 2) = 30.7, which means that we only have
30 bits. WriteTime then only has a resolution of 2 seconds, meaning
we lose yet another bit there. And finally AccessTime has the really
poor resolution of 1 day. So we need to spread things out. */
/* 29 bits in WriteTime */
ubuf.modtime = ((hash & 0x1fffffff) * 2) + FT80SEC;
/* And the remaining 3 bits in AccessTime. Things get hairy here as
Windows stores time stamps in local time on FAT. But since we only
have a resolution of a whole day, the conversion between UTC and
local time might shift us over to the wrong day. To handle this
we sacrifice a few bits and shift the value up enough that we can
mask off any conversion noise when we compare later. */
ubuf.actime = (((((hash >> 29) * 24) << 6) | 0x20) * 3600) + FT80SEC;
return backend_utime(obj, &ubuf);
}
/*
* check if a create verifier matches
*/
static int check_create_verifier(backend_statstruct * buf, createverf3 verf)
{
char hashbuf[9];
uint32 hash, expected;
/* Compute the expected value, same as above */
memcpy(hashbuf, verf, 8);
hashbuf[8] = '\0';
expected = fnv1a_32(hashbuf);
/* Extract the hash from the file, strategically dropping bits where
the file system might have messed things up for us (see above). */
hash = (buf->st_mtime - FT80SEC) / 2;
hash |= ((((buf->st_atime - FT80SEC) / 3600) >> 6) / 24) << 29;
return hash == expected;
}
CREATE3res *nfsproc3_create_3_svc(CREATE3args * argp, struct svc_req * rqstp)
{
static CREATE3res result;
char *path;
char obj[NFS_MAXPATHLEN];
sattr3 new_attr;
int fd = -1, res = -1;
backend_statstruct buf;
uint32 gen;
int flags = O_RDWR | O_CREAT | O_TRUNC | O_NONBLOCK;
PREP(path, argp->where.dir);
result.status = join(cat_name(path, argp->where.name, obj), exports_rw());
cluster_create(obj, rqstp, &result.status);
/* GUARDED and EXCLUSIVE maps to Unix exclusive create */
if (argp->how.mode != UNCHECKED)
flags = flags | O_EXCL;
if (argp->how.mode != EXCLUSIVE) {
new_attr = argp->how.createhow3_u.obj_attributes;
result.status = join(result.status, atomic_attr(new_attr));
}
/* Try to open the file */
if (result.status == NFS3_OK) {
if (argp->how.mode != EXCLUSIVE) {
fd = backend_open_create(obj, flags, create_mode(new_attr));
} else {
fd = backend_open_create(obj, flags, create_mode(new_attr));
}
}
if (fd != -1) {
/* Successful open */
res = backend_fstat(fd, &buf);
if (res != -1) {
/* Successful stat */
if (argp->how.mode == EXCLUSIVE) {
/* Save verifier in atime and mtime */
res = store_create_verifier(obj, argp->how.createhow3_u.verf);
/* Check that it was properly stored */
if (res != -1) {
res = backend_stat(obj, &buf);
}
if (res != -1) {
if (!check_create_verifier(&buf, argp->how.createhow3_u.verf)) {
res = -1;
}
}
}
}
if (res != -1) {
/* So far, so good */
gen = backend_get_gen(buf, fd, obj);
fh_cache_add(buf.st_dev, buf.st_ino, obj);
result.CREATE3res_u.resok.obj =
fh_extend_post(argp->where.dir, buf.st_dev, buf.st_ino, gen);
result.CREATE3res_u.resok.obj_attributes =
get_post_buf(buf, rqstp);
}
if (res == -1) {
/* backend_fstat() or store_create_verifier() failed */
result.status = NFS3ERR_IO;
}
backend_close(fd);
} else if (result.status == NFS3_OK) {
/* open() failed */
if (argp->how.mode == EXCLUSIVE && errno == EEXIST) {
/* Check if verifier matches */
fd = backend_open(obj, O_NONBLOCK);
if (fd != -1) {
res = backend_fstat(fd, &buf);
if (res != -1) {
if (check_create_verifier(&buf, argp->how.createhow3_u.verf)) {
/* The verifier matched. Return success */
gen = backend_get_gen(buf, fd, obj);
fh_cache_add(buf.st_dev, buf.st_ino, obj);
result.CREATE3res_u.resok.obj =
fh_extend_post(argp->where.dir, buf.st_dev,
buf.st_ino, gen);
result.CREATE3res_u.resok.obj_attributes =
get_post_buf(buf, rqstp);
} else {
/* The verifier doesn't match */
result.status = NFS3ERR_EXIST;
}
}
backend_close(fd);
}
}
if (res == -1) {
result.status = create_err();
}
}
/* overlaps with resfail */
result.CREATE3res_u.resok.dir_wcc.before = get_pre_cached();
result.CREATE3res_u.resok.dir_wcc.after = get_post_stat(path, rqstp);
return &result;
}
MKDIR3res *nfsproc3_mkdir_3_svc(MKDIR3args * argp, struct svc_req * rqstp)
{
static MKDIR3res result;
char *path;
pre_op_attr pre;
post_op_attr post;
char obj[NFS_MAXPATHLEN];
int res;
PREP(path, argp->where.dir);
pre = get_pre_cached();
result.status =
join3(cat_name(path, argp->where.name, obj),
atomic_attr(argp->attributes), exports_rw());
cluster_create(obj, rqstp, &result.status);
if (result.status == NFS3_OK) {
res = backend_mkdir(obj, create_mode(argp->attributes));
if (res == -1)
result.status = mkdir_err();
else {
result.MKDIR3res_u.resok.obj =
fh_extend_type(argp->where.dir, obj, S_IFDIR);
result.MKDIR3res_u.resok.obj_attributes = get_post_cached(rqstp);
}
}
post = get_post_attr(path, argp->where.dir, rqstp);
/* overlaps with resfail */
result.MKDIR3res_u.resok.dir_wcc.before = pre;
result.MKDIR3res_u.resok.dir_wcc.after = post;
return &result;
}
SYMLINK3res *nfsproc3_symlink_3_svc(SYMLINK3args * argp,
struct svc_req * rqstp)
{
static SYMLINK3res result;
char *path;
pre_op_attr pre;
post_op_attr post;
char obj[NFS_MAXPATHLEN];
int res;
mode_t new_mode;
PREP(path, argp->where.dir);
pre = get_pre_cached();
result.status =
join3(cat_name(path, argp->where.name, obj),
atomic_attr(argp->symlink.symlink_attributes), exports_rw());
cluster_create(obj, rqstp, &result.status);
if (argp->symlink.symlink_attributes.mode.set_it == TRUE)
new_mode = create_mode(argp->symlink.symlink_attributes);
else {
/* default rwxrwxrwx */
new_mode =
S_IRUSR | S_IWUSR | S_IXUSR | S_IRGRP | S_IWGRP | S_IXGRP |
S_IROTH | S_IWOTH | S_IXOTH;
}
if (result.status == NFS3_OK) {
umask(~new_mode);
res = backend_symlink(argp->symlink.symlink_data, obj);
umask(0);
if (res == -1)
result.status = symlink_err();
else {
result.SYMLINK3res_u.resok.obj =
fh_extend_type(argp->where.dir, obj, S_IFLNK);
result.SYMLINK3res_u.resok.obj_attributes =
get_post_cached(rqstp);
}
}
post = get_post_attr(path, argp->where.dir, rqstp);
/* overlaps with resfail */
result.SYMLINK3res_u.resok.dir_wcc.before = pre;
result.SYMLINK3res_u.resok.dir_wcc.after = post;
return &result;
}
#ifndef WIN32
/*
* create Unix socket
*/
static int mksocket(const char *path, mode_t mode)
{
int res, sock;
struct sockaddr_un addr;
sock = socket(PF_UNIX, SOCK_STREAM, 0);
addr.sun_family = AF_UNIX;
strcpy(addr.sun_path, path);
res = sock;
if (res != -1) {
umask(~mode);
res =
bind(sock, (struct sockaddr *) &addr,
sizeof(addr.sun_family) + strlen(addr.sun_path));
umask(0);
close(sock);
}
return res;
}
#endif /* WIN32 */
/*
* check and process arguments to MKNOD procedure
*/
static nfsstat3 mknod_args(mknoddata3 what, const char *obj, mode_t * mode,
dev_t * dev)
{
sattr3 attr;
/* determine attributes */
switch (what.type) {
case NF3REG:
case NF3DIR:
case NF3LNK:
return NFS3ERR_INVAL;
case NF3SOCK:
if (strlen(obj) + 1 > UNIX_PATH_MAX)
return NFS3ERR_NAMETOOLONG;
/* fall thru */
case NF3FIFO:
attr = what.mknoddata3_u.pipe_attributes;
break;
case NF3BLK:
case NF3CHR:
attr = what.mknoddata3_u.device.dev_attributes;
*dev = (what.mknoddata3_u.device.spec.specdata1 << 8)
+ what.mknoddata3_u.device.spec.specdata2;
break;
}
*mode = create_mode(attr);
/* adjust mode for creation of device special files */
switch (what.type) {
case NF3CHR:
*mode |= S_IFCHR;
break;
case NF3BLK:
*mode |= S_IFBLK;
break;
default:
break;
}
return atomic_attr(attr);
}
MKNOD3res *nfsproc3_mknod_3_svc(MKNOD3args * argp, struct svc_req * rqstp)
{
static MKNOD3res result;
char *path;
pre_op_attr pre;
post_op_attr post;
char obj[NFS_MAXPATHLEN];
int res;
mode_t new_mode = 0;
dev_t dev = 0;
PREP(path, argp->where.dir);
pre = get_pre_cached();
result.status =
join3(cat_name(path, argp->where.name, obj),
mknod_args(argp->what, obj, &new_mode, &dev), exports_rw());
cluster_create(obj, rqstp, &result.status);
if (result.status == NFS3_OK) {
if (argp->what.type == NF3CHR || argp->what.type == NF3BLK)
res = backend_mknod(obj, new_mode, dev); /* device */
else if (argp->what.type == NF3FIFO)
res = backend_mkfifo(obj, new_mode); /* FIFO */
else
res = backend_mksocket(obj, new_mode); /* socket */
if (res == -1) {
result.status = mknod_err();
} else {
result.MKNOD3res_u.resok.obj =
fh_extend_type(argp->where.dir, obj,
type_to_mode(argp->what.type));
result.MKNOD3res_u.resok.obj_attributes = get_post_cached(rqstp);
}
}
post = get_post_attr(path, argp->where.dir, rqstp);
/* overlaps with resfail */
result.MKNOD3res_u.resok.dir_wcc.before = pre;
result.MKNOD3res_u.resok.dir_wcc.after = post;
return &result;
}
REMOVE3res *nfsproc3_remove_3_svc(REMOVE3args * argp, struct svc_req * rqstp)
{
static REMOVE3res result;
char *path;
char obj[NFS_MAXPATHLEN];
int res;
PREP(path, argp->object.dir);
result.status =
join(cat_name(path, argp->object.name, obj), exports_rw());
cluster_lookup(obj, rqstp, &result.status);
if (result.status == NFS3_OK) {
change_readdir_cookie();
res = backend_remove(obj);
if (res == -1)
result.status = remove_err();
}
/* overlaps with resfail */
result.REMOVE3res_u.resok.dir_wcc.before = get_pre_cached();
result.REMOVE3res_u.resok.dir_wcc.after = get_post_stat(path, rqstp);
return &result;
}
RMDIR3res *nfsproc3_rmdir_3_svc(RMDIR3args * argp, struct svc_req * rqstp)
{
static RMDIR3res result;
char *path;
char obj[NFS_MAXPATHLEN];
int res;
PREP(path, argp->object.dir);
result.status =
join(cat_name(path, argp->object.name, obj), exports_rw());
cluster_lookup(obj, rqstp, &result.status);
if (result.status == NFS3_OK) {
change_readdir_cookie();
res = backend_rmdir(obj);
if (res == -1)
result.status = rmdir_err();
}
/* overlaps with resfail */
result.RMDIR3res_u.resok.dir_wcc.before = get_pre_cached();
result.RMDIR3res_u.resok.dir_wcc.after = get_post_stat(path, rqstp);
return &result;
}
RENAME3res *nfsproc3_rename_3_svc(RENAME3args * argp, struct svc_req * rqstp)
{
static RENAME3res result;
char *from;
char *to;
char from_obj[NFS_MAXPATHLEN];
char to_obj[NFS_MAXPATHLEN];
pre_op_attr pre;
post_op_attr post;
int res;
PREP(from, argp->from.dir);
pre = get_pre_cached();
result.status =
join(cat_name(from, argp->from.name, from_obj), exports_rw());
cluster_lookup(from_obj, rqstp, &result.status);
to = fh_decomp(argp->to.dir);
if (result.status == NFS3_OK) {
result.status =
join(cat_name(to, argp->to.name, to_obj),
exports_compat(to, rqstp));
cluster_create(to_obj, rqstp, &result.status);
if (result.status == NFS3_OK) {
change_readdir_cookie();
res = backend_rename(from_obj, to_obj);
if (res == -1)
result.status = rename_err();
/* Update the fh_cache with moved inode value */
fh_cache_update(argp->to.dir, to_obj);
}
}
post = get_post_attr(from, argp->from.dir, rqstp);
/* overlaps with resfail */
result.RENAME3res_u.resok.fromdir_wcc.before = pre;
result.RENAME3res_u.resok.fromdir_wcc.after = post;
result.RENAME3res_u.resok.todir_wcc.before = get_pre_cached();
result.RENAME3res_u.resok.todir_wcc.after = get_post_stat(to, rqstp);
return &result;
}
LINK3res *nfsproc3_link_3_svc(LINK3args * argp, struct svc_req * rqstp)
{
static LINK3res result;
char *path, *old;
pre_op_attr pre;
post_op_attr post;
char obj[NFS_MAXPATHLEN];
int res;
PREP(path, argp->link.dir);
pre = get_pre_cached();
result.status = join(cat_name(path, argp->link.name, obj), exports_rw());
cluster_create(obj, rqstp, &result.status);
old = fh_decomp(argp->file);
if (old && result.status == NFS3_OK) {
result.status = exports_compat(old, rqstp);
if (result.status == NFS3_OK) {
res = backend_link(old, obj);
if (res == -1)
result.status = link_err();
}
} else if (!old)
result.status = NFS3ERR_STALE;
post = get_post_attr(path, argp->link.dir, rqstp);
/* overlaps with resfail */
result.LINK3res_u.resok.file_attributes = get_post_stat(old, rqstp);
result.LINK3res_u.resok.linkdir_wcc.before = pre;
result.LINK3res_u.resok.linkdir_wcc.after = post;
return &result;
}
READDIR3res *nfsproc3_readdir_3_svc(READDIR3args * argp,
struct svc_req * rqstp)
{
static READDIR3res result;
char *path;
PREP(path, argp->dir);
result = read_dir(path, argp->cookie, argp->cookieverf, argp->count);
result.READDIR3res_u.resok.dir_attributes = get_post_stat(path, rqstp);
return &result;
}
READDIRPLUS3res *nfsproc3_readdirplus_3_svc(U(READDIRPLUS3args * argp),
U(struct svc_req * rqstp))
{
static READDIRPLUS3res result;
/*
* we don't do READDIRPLUS since it involves filehandle and
* attribute getting which is impossible to do atomically
* from user-space
*/
result.status = NFS3ERR_NOTSUPP;
result.READDIRPLUS3res_u.resfail.dir_attributes.attributes_follow = FALSE;
return &result;
}
FSSTAT3res *nfsproc3_fsstat_3_svc(FSSTAT3args * argp, struct svc_req * rqstp)
{
static FSSTAT3res result;
char *path;
backend_statvfsstruct buf;
int res;
PREP(path, argp->fsroot);
/* overlaps with resfail */
result.FSSTAT3res_u.resok.obj_attributes = get_post_cached(rqstp);
res = backend_statvfs(path, &buf);
if (res == -1) {
/* statvfs fell on its nose */
if ((exports_opts & OPT_REMOVABLE) && export_point(path)) {
/* Removable media export point; probably no media inserted.
Return dummy values. */
result.status = NFS3_OK;