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linux/fs/nfsd/nfs3proc.c
NeilBrown 438f81e0e9 nfsd: move error choice for incorrect object types to version-specific code. 
If an NFS operation expects a particular sort of object (file, dir, link,
etc) but gets a file handle for a different sort of object, it must
return an error.  The actual error varies among NFS versions in non-trivial
ways.

For v2 and v3 there are ISDIR and NOTDIR errors and, for NFSv4 only,
INVAL is suitable.

For v4.0 there is also NFS4ERR_SYMLINK which should be used if a SYMLINK
was found when not expected.  This take precedence over NOTDIR.

For v4.1+ there is also NFS4ERR_WRONG_TYPE which should be used in
preference to EINVAL when none of the specific error codes apply.

When nfsd_mode_check() finds a symlink where it expected a directory it
needs to return an error code that can be converted to NOTDIR for v2 or
v3 but will be SYMLINK for v4.  It must be different from the error
code returns when it finds a symlink but expects a regular file - that
must be converted to EINVAL or SYMLINK.

So we introduce an internal error code nfserr_symlink_not_dir which each
version converts as appropriate.

nfsd_check_obj_isreg() is similar to nfsd_mode_check() except that it is
only used by NFSv4 and only for OPEN.  NFSERR_INVAL is never a suitable
error if the object is the wrong time.  For v4.0 we use nfserr_symlink
for non-dirs even if not a symlink.  For v4.1 we have nfserr_wrong_type.
We handle this difference in-place in nfsd_check_obj_isreg() as there is
nothing to be gained by delaying the choice to nfsd4_map_status().

As a result of these changes, nfsd_mode_check() doesn't need an rqstp
arg any more.

Note that NFSv4 operations are actually performed in the xdr code(!!!)
so to the only place that we can map the status code successfully is in
nfsd4_encode_operation().

Signed-off-by: NeilBrown <neilb@suse.de>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
2024-09-20 19:31:03 -04:00

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// SPDX-License-Identifier: GPL-2.0
/*
* Process version 3 NFS requests.
*
* Copyright (C) 1996, 1997, 1998 Olaf Kirch <okir@monad.swb.de>
*/
#include <linux/fs.h>
#include <linux/ext2_fs.h>
#include <linux/magic.h>
#include <linux/namei.h>
#include "cache.h"
#include "xdr3.h"
#include "vfs.h"
#include "filecache.h"
#define NFSDDBG_FACILITY NFSDDBG_PROC
static int nfs3_ftypes[] = {
0, /* NF3NON */
S_IFREG, /* NF3REG */
S_IFDIR, /* NF3DIR */
S_IFBLK, /* NF3BLK */
S_IFCHR, /* NF3CHR */
S_IFLNK, /* NF3LNK */
S_IFSOCK, /* NF3SOCK */
S_IFIFO, /* NF3FIFO */
};
static __be32 nfsd3_map_status(__be32 status)
{
switch (status) {
case nfs_ok:
break;
case nfserr_nofilehandle:
status = nfserr_badhandle;
break;
case nfserr_wrongsec:
case nfserr_file_open:
status = nfserr_acces;
break;
case nfserr_symlink_not_dir:
status = nfserr_notdir;
break;
case nfserr_symlink:
case nfserr_wrong_type:
status = nfserr_inval;
break;
}
return status;
}
/*
* NULL call.
*/
static __be32
nfsd3_proc_null(struct svc_rqst *rqstp)
{
return rpc_success;
}
/*
* Get a file's attributes
*/
static __be32
nfsd3_proc_getattr(struct svc_rqst *rqstp)
{
struct nfsd_fhandle *argp = rqstp->rq_argp;
struct nfsd3_attrstat *resp = rqstp->rq_resp;
dprintk("nfsd: GETATTR(3) %s\n",
SVCFH_fmt(&argp->fh));
fh_copy(&resp->fh, &argp->fh);
resp->status = fh_verify(rqstp, &resp->fh, 0,
NFSD_MAY_NOP | NFSD_MAY_BYPASS_GSS_ON_ROOT);
if (resp->status != nfs_ok)
goto out;
resp->status = fh_getattr(&resp->fh, &resp->stat);
out:
resp->status = nfsd3_map_status(resp->status);
return rpc_success;
}
/*
* Set a file's attributes
*/
static __be32
nfsd3_proc_setattr(struct svc_rqst *rqstp)
{
struct nfsd3_sattrargs *argp = rqstp->rq_argp;
struct nfsd3_attrstat *resp = rqstp->rq_resp;
struct nfsd_attrs attrs = {
.na_iattr = &argp->attrs,
};
const struct timespec64 *guardtime = NULL;
dprintk("nfsd: SETATTR(3) %s\n",
SVCFH_fmt(&argp->fh));
fh_copy(&resp->fh, &argp->fh);
if (argp->check_guard)
guardtime = &argp->guardtime;
resp->status = nfsd_setattr(rqstp, &resp->fh, &attrs, guardtime);
resp->status = nfsd3_map_status(resp->status);
return rpc_success;
}
/*
* Look up a path name component
*/
static __be32
nfsd3_proc_lookup(struct svc_rqst *rqstp)
{
struct nfsd3_diropargs *argp = rqstp->rq_argp;
struct nfsd3_diropres *resp = rqstp->rq_resp;
dprintk("nfsd: LOOKUP(3) %s %.*s\n",
SVCFH_fmt(&argp->fh),
argp->len,
argp->name);
fh_copy(&resp->dirfh, &argp->fh);
fh_init(&resp->fh, NFS3_FHSIZE);
resp->status = nfsd_lookup(rqstp, &resp->dirfh,
argp->name, argp->len,
&resp->fh);
resp->status = nfsd3_map_status(resp->status);
return rpc_success;
}
/*
* Check file access
*/
static __be32
nfsd3_proc_access(struct svc_rqst *rqstp)
{
struct nfsd3_accessargs *argp = rqstp->rq_argp;
struct nfsd3_accessres *resp = rqstp->rq_resp;
dprintk("nfsd: ACCESS(3) %s 0x%x\n",
SVCFH_fmt(&argp->fh),
argp->access);
fh_copy(&resp->fh, &argp->fh);
resp->access = argp->access;
resp->status = nfsd_access(rqstp, &resp->fh, &resp->access, NULL);
resp->status = nfsd3_map_status(resp->status);
return rpc_success;
}
/*
* Read a symlink.
*/
static __be32
nfsd3_proc_readlink(struct svc_rqst *rqstp)
{
struct nfsd_fhandle *argp = rqstp->rq_argp;
struct nfsd3_readlinkres *resp = rqstp->rq_resp;
dprintk("nfsd: READLINK(3) %s\n", SVCFH_fmt(&argp->fh));
/* Read the symlink. */
fh_copy(&resp->fh, &argp->fh);
resp->len = NFS3_MAXPATHLEN;
resp->pages = rqstp->rq_next_page++;
resp->status = nfsd_readlink(rqstp, &resp->fh,
page_address(*resp->pages), &resp->len);
resp->status = nfsd3_map_status(resp->status);
return rpc_success;
}
/*
* Read a portion of a file.
*/
static __be32
nfsd3_proc_read(struct svc_rqst *rqstp)
{
struct nfsd3_readargs *argp = rqstp->rq_argp;
struct nfsd3_readres *resp = rqstp->rq_resp;
dprintk("nfsd: READ(3) %s %lu bytes at %Lu\n",
SVCFH_fmt(&argp->fh),
(unsigned long) argp->count,
(unsigned long long) argp->offset);
argp->count = min_t(u32, argp->count, svc_max_payload(rqstp));
argp->count = min_t(u32, argp->count, rqstp->rq_res.buflen);
if (argp->offset > (u64)OFFSET_MAX)
argp->offset = (u64)OFFSET_MAX;
if (argp->offset + argp->count > (u64)OFFSET_MAX)
argp->count = (u64)OFFSET_MAX - argp->offset;
resp->pages = rqstp->rq_next_page;
/* Obtain buffer pointer for payload.
* 1 (status) + 22 (post_op_attr) + 1 (count) + 1 (eof)
* + 1 (xdr opaque byte count) = 26
*/
resp->count = argp->count;
svc_reserve_auth(rqstp, ((1 + NFS3_POST_OP_ATTR_WORDS + 3) << 2) +
resp->count + 4);
fh_copy(&resp->fh, &argp->fh);
resp->status = nfsd_read(rqstp, &resp->fh, argp->offset,
&resp->count, &resp->eof);
resp->status = nfsd3_map_status(resp->status);
return rpc_success;
}
/*
* Write data to a file
*/
static __be32
nfsd3_proc_write(struct svc_rqst *rqstp)
{
struct nfsd3_writeargs *argp = rqstp->rq_argp;
struct nfsd3_writeres *resp = rqstp->rq_resp;
unsigned long cnt = argp->len;
unsigned int nvecs;
dprintk("nfsd: WRITE(3) %s %d bytes at %Lu%s\n",
SVCFH_fmt(&argp->fh),
argp->len,
(unsigned long long) argp->offset,
argp->stable ? " stable" : "");
resp->status = nfserr_fbig;
if (argp->offset > (u64)OFFSET_MAX ||
argp->offset + argp->len > (u64)OFFSET_MAX)
return rpc_success;
fh_copy(&resp->fh, &argp->fh);
resp->committed = argp->stable;
nvecs = svc_fill_write_vector(rqstp, &argp->payload);
resp->status = nfsd_write(rqstp, &resp->fh, argp->offset,
rqstp->rq_vec, nvecs, &cnt,
resp->committed, resp->verf);
resp->count = cnt;
resp->status = nfsd3_map_status(resp->status);
return rpc_success;
}
/*
* Implement NFSv3's unchecked, guarded, and exclusive CREATE
* semantics for regular files. Except for the created file,
* this operation is stateless on the server.
*
* Upon return, caller must release @fhp and @resfhp.
*/
static __be32
nfsd3_create_file(struct svc_rqst *rqstp, struct svc_fh *fhp,
struct svc_fh *resfhp, struct nfsd3_createargs *argp)
{
struct iattr *iap = &argp->attrs;
struct dentry *parent, *child;
struct nfsd_attrs attrs = {
.na_iattr = iap,
};
__u32 v_mtime, v_atime;
struct inode *inode;
__be32 status;
int host_err;
if (isdotent(argp->name, argp->len))
return nfserr_exist;
if (!(iap->ia_valid & ATTR_MODE))
iap->ia_mode = 0;
status = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_EXEC);
if (status != nfs_ok)
return status;
parent = fhp->fh_dentry;
inode = d_inode(parent);
host_err = fh_want_write(fhp);
if (host_err)
return nfserrno(host_err);
inode_lock_nested(inode, I_MUTEX_PARENT);
child = lookup_one_len(argp->name, parent, argp->len);
if (IS_ERR(child)) {
status = nfserrno(PTR_ERR(child));
goto out;
}
if (d_really_is_negative(child)) {
status = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE);
if (status != nfs_ok)
goto out;
}
status = fh_compose(resfhp, fhp->fh_export, child, fhp);
if (status != nfs_ok)
goto out;
v_mtime = 0;
v_atime = 0;
if (argp->createmode == NFS3_CREATE_EXCLUSIVE) {
u32 *verifier = (u32 *)argp->verf;
/*
* Solaris 7 gets confused (bugid 4218508) if these have
* the high bit set, as do xfs filesystems without the
* "bigtime" feature. So just clear the high bits.
*/
v_mtime = verifier[0] & 0x7fffffff;
v_atime = verifier[1] & 0x7fffffff;
}
if (d_really_is_positive(child)) {
status = nfs_ok;
switch (argp->createmode) {
case NFS3_CREATE_UNCHECKED:
if (!d_is_reg(child))
break;
iap->ia_valid &= ATTR_SIZE;
goto set_attr;
case NFS3_CREATE_GUARDED:
status = nfserr_exist;
break;
case NFS3_CREATE_EXCLUSIVE:
if (inode_get_mtime_sec(d_inode(child)) == v_mtime &&
inode_get_atime_sec(d_inode(child)) == v_atime &&
d_inode(child)->i_size == 0) {
break;
}
status = nfserr_exist;
}
goto out;
}
if (!IS_POSIXACL(inode))
iap->ia_mode &= ~current_umask();
status = fh_fill_pre_attrs(fhp);
if (status != nfs_ok)
goto out;
host_err = vfs_create(&nop_mnt_idmap, inode, child, iap->ia_mode, true);
if (host_err < 0) {
status = nfserrno(host_err);
goto out;
}
fh_fill_post_attrs(fhp);
/* A newly created file already has a file size of zero. */
if ((iap->ia_valid & ATTR_SIZE) && (iap->ia_size == 0))
iap->ia_valid &= ~ATTR_SIZE;
if (argp->createmode == NFS3_CREATE_EXCLUSIVE) {
iap->ia_valid = ATTR_MTIME | ATTR_ATIME |
ATTR_MTIME_SET | ATTR_ATIME_SET;
iap->ia_mtime.tv_sec = v_mtime;
iap->ia_atime.tv_sec = v_atime;
iap->ia_mtime.tv_nsec = 0;
iap->ia_atime.tv_nsec = 0;
}
set_attr:
status = nfsd_create_setattr(rqstp, fhp, resfhp, &attrs);
out:
inode_unlock(inode);
if (child && !IS_ERR(child))
dput(child);
fh_drop_write(fhp);
return status;
}
static __be32
nfsd3_proc_create(struct svc_rqst *rqstp)
{
struct nfsd3_createargs *argp = rqstp->rq_argp;
struct nfsd3_diropres *resp = rqstp->rq_resp;
svc_fh *dirfhp, *newfhp;
dprintk("nfsd: CREATE(3) %s %.*s\n",
SVCFH_fmt(&argp->fh),
argp->len,
argp->name);
dirfhp = fh_copy(&resp->dirfh, &argp->fh);
newfhp = fh_init(&resp->fh, NFS3_FHSIZE);
resp->status = nfsd3_create_file(rqstp, dirfhp, newfhp, argp);
resp->status = nfsd3_map_status(resp->status);
return rpc_success;
}
/*
* Make directory. This operation is not idempotent.
*/
static __be32
nfsd3_proc_mkdir(struct svc_rqst *rqstp)
{
struct nfsd3_createargs *argp = rqstp->rq_argp;
struct nfsd3_diropres *resp = rqstp->rq_resp;
struct nfsd_attrs attrs = {
.na_iattr = &argp->attrs,
};
dprintk("nfsd: MKDIR(3) %s %.*s\n",
SVCFH_fmt(&argp->fh),
argp->len,
argp->name);
argp->attrs.ia_valid &= ~ATTR_SIZE;
fh_copy(&resp->dirfh, &argp->fh);
fh_init(&resp->fh, NFS3_FHSIZE);
resp->status = nfsd_create(rqstp, &resp->dirfh, argp->name, argp->len,
&attrs, S_IFDIR, 0, &resp->fh);
resp->status = nfsd3_map_status(resp->status);
return rpc_success;
}
static __be32
nfsd3_proc_symlink(struct svc_rqst *rqstp)
{
struct nfsd3_symlinkargs *argp = rqstp->rq_argp;
struct nfsd3_diropres *resp = rqstp->rq_resp;
struct nfsd_attrs attrs = {
.na_iattr = &argp->attrs,
};
if (argp->tlen == 0) {
resp->status = nfserr_inval;
goto out;
}
if (argp->tlen > NFS3_MAXPATHLEN) {
resp->status = nfserr_nametoolong;
goto out;
}
argp->tname = svc_fill_symlink_pathname(rqstp, &argp->first,
page_address(rqstp->rq_arg.pages[0]),
argp->tlen);
if (IS_ERR(argp->tname)) {
resp->status = nfserrno(PTR_ERR(argp->tname));
goto out;
}
dprintk("nfsd: SYMLINK(3) %s %.*s -> %.*s\n",
SVCFH_fmt(&argp->ffh),
argp->flen, argp->fname,
argp->tlen, argp->tname);
fh_copy(&resp->dirfh, &argp->ffh);
fh_init(&resp->fh, NFS3_FHSIZE);
resp->status = nfsd_symlink(rqstp, &resp->dirfh, argp->fname,
argp->flen, argp->tname, &attrs, &resp->fh);
kfree(argp->tname);
out:
resp->status = nfsd3_map_status(resp->status);
return rpc_success;
}
/*
* Make socket/fifo/device.
*/
static __be32
nfsd3_proc_mknod(struct svc_rqst *rqstp)
{
struct nfsd3_mknodargs *argp = rqstp->rq_argp;
struct nfsd3_diropres *resp = rqstp->rq_resp;
struct nfsd_attrs attrs = {
.na_iattr = &argp->attrs,
};
int type;
dev_t rdev = 0;
dprintk("nfsd: MKNOD(3) %s %.*s\n",
SVCFH_fmt(&argp->fh),
argp->len,
argp->name);
fh_copy(&resp->dirfh, &argp->fh);
fh_init(&resp->fh, NFS3_FHSIZE);
if (argp->ftype == NF3CHR || argp->ftype == NF3BLK) {
rdev = MKDEV(argp->major, argp->minor);
if (MAJOR(rdev) != argp->major ||
MINOR(rdev) != argp->minor) {
resp->status = nfserr_inval;
goto out;
}
} else if (argp->ftype != NF3SOCK && argp->ftype != NF3FIFO) {
resp->status = nfserr_badtype;
goto out;
}
type = nfs3_ftypes[argp->ftype];
resp->status = nfsd_create(rqstp, &resp->dirfh, argp->name, argp->len,
&attrs, type, rdev, &resp->fh);
out:
resp->status = nfsd3_map_status(resp->status);
return rpc_success;
}
/*
* Remove file/fifo/socket etc.
*/
static __be32
nfsd3_proc_remove(struct svc_rqst *rqstp)
{
struct nfsd3_diropargs *argp = rqstp->rq_argp;
struct nfsd3_attrstat *resp = rqstp->rq_resp;
dprintk("nfsd: REMOVE(3) %s %.*s\n",
SVCFH_fmt(&argp->fh),
argp->len,
argp->name);
/* Unlink. -S_IFDIR means file must not be a directory */
fh_copy(&resp->fh, &argp->fh);
resp->status = nfsd_unlink(rqstp, &resp->fh, -S_IFDIR,
argp->name, argp->len);
resp->status = nfsd3_map_status(resp->status);
return rpc_success;
}
/*
* Remove a directory
*/
static __be32
nfsd3_proc_rmdir(struct svc_rqst *rqstp)
{
struct nfsd3_diropargs *argp = rqstp->rq_argp;
struct nfsd3_attrstat *resp = rqstp->rq_resp;
dprintk("nfsd: RMDIR(3) %s %.*s\n",
SVCFH_fmt(&argp->fh),
argp->len,
argp->name);
fh_copy(&resp->fh, &argp->fh);
resp->status = nfsd_unlink(rqstp, &resp->fh, S_IFDIR,
argp->name, argp->len);
resp->status = nfsd3_map_status(resp->status);
return rpc_success;
}
static __be32
nfsd3_proc_rename(struct svc_rqst *rqstp)
{
struct nfsd3_renameargs *argp = rqstp->rq_argp;
struct nfsd3_renameres *resp = rqstp->rq_resp;
dprintk("nfsd: RENAME(3) %s %.*s ->\n",
SVCFH_fmt(&argp->ffh),
argp->flen,
argp->fname);
dprintk("nfsd: -> %s %.*s\n",
SVCFH_fmt(&argp->tfh),
argp->tlen,
argp->tname);
fh_copy(&resp->ffh, &argp->ffh);
fh_copy(&resp->tfh, &argp->tfh);
resp->status = nfsd_rename(rqstp, &resp->ffh, argp->fname, argp->flen,
&resp->tfh, argp->tname, argp->tlen);
resp->status = nfsd3_map_status(resp->status);
return rpc_success;
}
static __be32
nfsd3_proc_link(struct svc_rqst *rqstp)
{
struct nfsd3_linkargs *argp = rqstp->rq_argp;
struct nfsd3_linkres *resp = rqstp->rq_resp;
dprintk("nfsd: LINK(3) %s ->\n",
SVCFH_fmt(&argp->ffh));
dprintk("nfsd: -> %s %.*s\n",
SVCFH_fmt(&argp->tfh),
argp->tlen,
argp->tname);
fh_copy(&resp->fh, &argp->ffh);
fh_copy(&resp->tfh, &argp->tfh);
resp->status = nfsd_link(rqstp, &resp->tfh, argp->tname, argp->tlen,
&resp->fh);
resp->status = nfsd3_map_status(resp->status);
return rpc_success;
}
static void nfsd3_init_dirlist_pages(struct svc_rqst *rqstp,
struct nfsd3_readdirres *resp,
u32 count)
{
struct xdr_buf *buf = &resp->dirlist;
struct xdr_stream *xdr = &resp->xdr;
unsigned int sendbuf = min_t(unsigned int, rqstp->rq_res.buflen,
svc_max_payload(rqstp));
memset(buf, 0, sizeof(*buf));
/* Reserve room for the NULL ptr & eof flag (-2 words) */
buf->buflen = clamp(count, (u32)(XDR_UNIT * 2), sendbuf);
buf->buflen -= XDR_UNIT * 2;
buf->pages = rqstp->rq_next_page;
rqstp->rq_next_page += (buf->buflen + PAGE_SIZE - 1) >> PAGE_SHIFT;
xdr_init_encode_pages(xdr, buf, buf->pages, NULL);
}
/*
* Read a portion of a directory.
*/
static __be32
nfsd3_proc_readdir(struct svc_rqst *rqstp)
{
struct nfsd3_readdirargs *argp = rqstp->rq_argp;
struct nfsd3_readdirres *resp = rqstp->rq_resp;
loff_t offset;
dprintk("nfsd: READDIR(3) %s %d bytes at %d\n",
SVCFH_fmt(&argp->fh),
argp->count, (u32) argp->cookie);
nfsd3_init_dirlist_pages(rqstp, resp, argp->count);
fh_copy(&resp->fh, &argp->fh);
resp->common.err = nfs_ok;
resp->cookie_offset = 0;
resp->rqstp = rqstp;
offset = argp->cookie;
resp->status = nfsd_readdir(rqstp, &resp->fh, &offset,
&resp->common, nfs3svc_encode_entry3);
memcpy(resp->verf, argp->verf, 8);
nfs3svc_encode_cookie3(resp, offset);
/* Recycle only pages that were part of the reply */
rqstp->rq_next_page = resp->xdr.page_ptr + 1;
resp->status = nfsd3_map_status(resp->status);
return rpc_success;
}
/*
* Read a portion of a directory, including file handles and attrs.
* For now, we choose to ignore the dircount parameter.
*/
static __be32
nfsd3_proc_readdirplus(struct svc_rqst *rqstp)
{
struct nfsd3_readdirargs *argp = rqstp->rq_argp;
struct nfsd3_readdirres *resp = rqstp->rq_resp;
loff_t offset;
dprintk("nfsd: READDIR+(3) %s %d bytes at %d\n",
SVCFH_fmt(&argp->fh),
argp->count, (u32) argp->cookie);
nfsd3_init_dirlist_pages(rqstp, resp, argp->count);
fh_copy(&resp->fh, &argp->fh);
resp->common.err = nfs_ok;
resp->cookie_offset = 0;
resp->rqstp = rqstp;
offset = argp->cookie;
resp->status = fh_verify(rqstp, &resp->fh, S_IFDIR, NFSD_MAY_NOP);
if (resp->status != nfs_ok)
goto out;
if (resp->fh.fh_export->ex_flags & NFSEXP_NOREADDIRPLUS) {
resp->status = nfserr_notsupp;
goto out;
}
resp->status = nfsd_readdir(rqstp, &resp->fh, &offset,
&resp->common, nfs3svc_encode_entryplus3);
memcpy(resp->verf, argp->verf, 8);
nfs3svc_encode_cookie3(resp, offset);
/* Recycle only pages that were part of the reply */
rqstp->rq_next_page = resp->xdr.page_ptr + 1;
out:
resp->status = nfsd3_map_status(resp->status);
return rpc_success;
}
/*
* Get file system stats
*/
static __be32
nfsd3_proc_fsstat(struct svc_rqst *rqstp)
{
struct nfsd_fhandle *argp = rqstp->rq_argp;
struct nfsd3_fsstatres *resp = rqstp->rq_resp;
dprintk("nfsd: FSSTAT(3) %s\n",
SVCFH_fmt(&argp->fh));
resp->status = nfsd_statfs(rqstp, &argp->fh, &resp->stats, 0);
fh_put(&argp->fh);
resp->status = nfsd3_map_status(resp->status);
return rpc_success;
}
/*
* Get file system info
*/
static __be32
nfsd3_proc_fsinfo(struct svc_rqst *rqstp)
{
struct nfsd_fhandle *argp = rqstp->rq_argp;
struct nfsd3_fsinfores *resp = rqstp->rq_resp;
u32 max_blocksize = svc_max_payload(rqstp);
dprintk("nfsd: FSINFO(3) %s\n",
SVCFH_fmt(&argp->fh));
resp->f_rtmax = max_blocksize;
resp->f_rtpref = max_blocksize;
resp->f_rtmult = PAGE_SIZE;
resp->f_wtmax = max_blocksize;
resp->f_wtpref = max_blocksize;
resp->f_wtmult = PAGE_SIZE;
resp->f_dtpref = max_blocksize;
resp->f_maxfilesize = ~(u32) 0;
resp->f_properties = NFS3_FSF_DEFAULT;
resp->status = fh_verify(rqstp, &argp->fh, 0,
NFSD_MAY_NOP | NFSD_MAY_BYPASS_GSS_ON_ROOT);
/* Check special features of the file system. May request
* different read/write sizes for file systems known to have
* problems with large blocks */
if (resp->status == nfs_ok) {
struct super_block *sb = argp->fh.fh_dentry->d_sb;
/* Note that we don't care for remote fs's here */
if (sb->s_magic == MSDOS_SUPER_MAGIC) {
resp->f_properties = NFS3_FSF_BILLYBOY;
}
resp->f_maxfilesize = sb->s_maxbytes;
}
fh_put(&argp->fh);
resp->status = nfsd3_map_status(resp->status);
return rpc_success;
}
/*
* Get pathconf info for the specified file
*/
static __be32
nfsd3_proc_pathconf(struct svc_rqst *rqstp)
{
struct nfsd_fhandle *argp = rqstp->rq_argp;
struct nfsd3_pathconfres *resp = rqstp->rq_resp;
dprintk("nfsd: PATHCONF(3) %s\n",
SVCFH_fmt(&argp->fh));
/* Set default pathconf */
resp->p_link_max = 255; /* at least */
resp->p_name_max = 255; /* at least */
resp->p_no_trunc = 0;
resp->p_chown_restricted = 1;
resp->p_case_insensitive = 0;
resp->p_case_preserving = 1;
resp->status = fh_verify(rqstp, &argp->fh, 0, NFSD_MAY_NOP);
if (resp->status == nfs_ok) {
struct super_block *sb = argp->fh.fh_dentry->d_sb;
/* Note that we don't care for remote fs's here */
switch (sb->s_magic) {
case EXT2_SUPER_MAGIC:
resp->p_link_max = EXT2_LINK_MAX;
resp->p_name_max = EXT2_NAME_LEN;
break;
case MSDOS_SUPER_MAGIC:
resp->p_case_insensitive = 1;
resp->p_case_preserving = 0;
break;
}
}
fh_put(&argp->fh);
resp->status = nfsd3_map_status(resp->status);
return rpc_success;
}
/*
* Commit a file (range) to stable storage.
*/
static __be32
nfsd3_proc_commit(struct svc_rqst *rqstp)
{
struct nfsd3_commitargs *argp = rqstp->rq_argp;
struct nfsd3_commitres *resp = rqstp->rq_resp;
struct nfsd_file *nf;
dprintk("nfsd: COMMIT(3) %s %u@%Lu\n",
SVCFH_fmt(&argp->fh),
argp->count,
(unsigned long long) argp->offset);
fh_copy(&resp->fh, &argp->fh);
resp->status = nfsd_file_acquire_gc(rqstp, &resp->fh, NFSD_MAY_WRITE |
NFSD_MAY_NOT_BREAK_LEASE, &nf);
if (resp->status)
goto out;
resp->status = nfsd_commit(rqstp, &resp->fh, nf, argp->offset,
argp->count, resp->verf);
nfsd_file_put(nf);
out:
resp->status = nfsd3_map_status(resp->status);
return rpc_success;
}
/*
* NFSv3 Server procedures.
* Only the results of non-idempotent operations are cached.
*/
#define nfs3svc_encode_attrstatres nfs3svc_encode_attrstat
#define nfs3svc_encode_wccstatres nfs3svc_encode_wccstat
#define nfsd3_mkdirargs nfsd3_createargs
#define nfsd3_readdirplusargs nfsd3_readdirargs
#define nfsd3_fhandleargs nfsd_fhandle
#define nfsd3_attrstatres nfsd3_attrstat
#define nfsd3_wccstatres nfsd3_attrstat
#define nfsd3_createres nfsd3_diropres
#define ST 1 /* status*/
#define FH 17 /* filehandle with length */
#define AT 21 /* attributes */
#define pAT (1+AT) /* post attributes - conditional */
#define WC (7+pAT) /* WCC attributes */
static const struct svc_procedure nfsd_procedures3[22] = {
[NFS3PROC_NULL] = {
.pc_func = nfsd3_proc_null,
.pc_decode = nfssvc_decode_voidarg,
.pc_encode = nfssvc_encode_voidres,
.pc_argsize = sizeof(struct nfsd_voidargs),
.pc_argzero = sizeof(struct nfsd_voidargs),
.pc_ressize = sizeof(struct nfsd_voidres),
.pc_cachetype = RC_NOCACHE,
.pc_xdrressize = ST,
.pc_name = "NULL",
},
[NFS3PROC_GETATTR] = {
.pc_func = nfsd3_proc_getattr,
.pc_decode = nfs3svc_decode_fhandleargs,
.pc_encode = nfs3svc_encode_getattrres,
.pc_release = nfs3svc_release_fhandle,
.pc_argsize = sizeof(struct nfsd_fhandle),
.pc_argzero = sizeof(struct nfsd_fhandle),
.pc_ressize = sizeof(struct nfsd3_attrstatres),
.pc_cachetype = RC_NOCACHE,
.pc_xdrressize = ST+AT,
.pc_name = "GETATTR",
},
[NFS3PROC_SETATTR] = {
.pc_func = nfsd3_proc_setattr,
.pc_decode = nfs3svc_decode_sattrargs,
.pc_encode = nfs3svc_encode_wccstatres,
.pc_release = nfs3svc_release_fhandle,
.pc_argsize = sizeof(struct nfsd3_sattrargs),
.pc_argzero = sizeof(struct nfsd3_sattrargs),
.pc_ressize = sizeof(struct nfsd3_wccstatres),
.pc_cachetype = RC_REPLBUFF,
.pc_xdrressize = ST+WC,
.pc_name = "SETATTR",
},
[NFS3PROC_LOOKUP] = {
.pc_func = nfsd3_proc_lookup,
.pc_decode = nfs3svc_decode_diropargs,
.pc_encode = nfs3svc_encode_lookupres,
.pc_release = nfs3svc_release_fhandle2,
.pc_argsize = sizeof(struct nfsd3_diropargs),
.pc_argzero = sizeof(struct nfsd3_diropargs),
.pc_ressize = sizeof(struct nfsd3_diropres),
.pc_cachetype = RC_NOCACHE,
.pc_xdrressize = ST+FH+pAT+pAT,
.pc_name = "LOOKUP",
},
[NFS3PROC_ACCESS] = {
.pc_func = nfsd3_proc_access,
.pc_decode = nfs3svc_decode_accessargs,
.pc_encode = nfs3svc_encode_accessres,
.pc_release = nfs3svc_release_fhandle,
.pc_argsize = sizeof(struct nfsd3_accessargs),
.pc_argzero = sizeof(struct nfsd3_accessargs),
.pc_ressize = sizeof(struct nfsd3_accessres),
.pc_cachetype = RC_NOCACHE,
.pc_xdrressize = ST+pAT+1,
.pc_name = "ACCESS",
},
[NFS3PROC_READLINK] = {
.pc_func = nfsd3_proc_readlink,
.pc_decode = nfs3svc_decode_fhandleargs,
.pc_encode = nfs3svc_encode_readlinkres,
.pc_release = nfs3svc_release_fhandle,
.pc_argsize = sizeof(struct nfsd_fhandle),
.pc_argzero = sizeof(struct nfsd_fhandle),
.pc_ressize = sizeof(struct nfsd3_readlinkres),
.pc_cachetype = RC_NOCACHE,
.pc_xdrressize = ST+pAT+1+NFS3_MAXPATHLEN/4,
.pc_name = "READLINK",
},
[NFS3PROC_READ] = {
.pc_func = nfsd3_proc_read,
.pc_decode = nfs3svc_decode_readargs,
.pc_encode = nfs3svc_encode_readres,
.pc_release = nfs3svc_release_fhandle,
.pc_argsize = sizeof(struct nfsd3_readargs),
.pc_argzero = sizeof(struct nfsd3_readargs),
.pc_ressize = sizeof(struct nfsd3_readres),
.pc_cachetype = RC_NOCACHE,
.pc_xdrressize = ST+pAT+4+NFSSVC_MAXBLKSIZE/4,
.pc_name = "READ",
},
[NFS3PROC_WRITE] = {
.pc_func = nfsd3_proc_write,
.pc_decode = nfs3svc_decode_writeargs,
.pc_encode = nfs3svc_encode_writeres,
.pc_release = nfs3svc_release_fhandle,
.pc_argsize = sizeof(struct nfsd3_writeargs),
.pc_argzero = sizeof(struct nfsd3_writeargs),
.pc_ressize = sizeof(struct nfsd3_writeres),
.pc_cachetype = RC_REPLBUFF,
.pc_xdrressize = ST+WC+4,
.pc_name = "WRITE",
},
[NFS3PROC_CREATE] = {
.pc_func = nfsd3_proc_create,
.pc_decode = nfs3svc_decode_createargs,
.pc_encode = nfs3svc_encode_createres,
.pc_release = nfs3svc_release_fhandle2,
.pc_argsize = sizeof(struct nfsd3_createargs),
.pc_argzero = sizeof(struct nfsd3_createargs),
.pc_ressize = sizeof(struct nfsd3_createres),
.pc_cachetype = RC_REPLBUFF,
.pc_xdrressize = ST+(1+FH+pAT)+WC,
.pc_name = "CREATE",
},
[NFS3PROC_MKDIR] = {
.pc_func = nfsd3_proc_mkdir,
.pc_decode = nfs3svc_decode_mkdirargs,
.pc_encode = nfs3svc_encode_createres,
.pc_release = nfs3svc_release_fhandle2,
.pc_argsize = sizeof(struct nfsd3_mkdirargs),
.pc_argzero = sizeof(struct nfsd3_mkdirargs),
.pc_ressize = sizeof(struct nfsd3_createres),
.pc_cachetype = RC_REPLBUFF,
.pc_xdrressize = ST+(1+FH+pAT)+WC,
.pc_name = "MKDIR",
},
[NFS3PROC_SYMLINK] = {
.pc_func = nfsd3_proc_symlink,
.pc_decode = nfs3svc_decode_symlinkargs,
.pc_encode = nfs3svc_encode_createres,
.pc_release = nfs3svc_release_fhandle2,
.pc_argsize = sizeof(struct nfsd3_symlinkargs),
.pc_argzero = sizeof(struct nfsd3_symlinkargs),
.pc_ressize = sizeof(struct nfsd3_createres),
.pc_cachetype = RC_REPLBUFF,
.pc_xdrressize = ST+(1+FH+pAT)+WC,
.pc_name = "SYMLINK",
},
[NFS3PROC_MKNOD] = {
.pc_func = nfsd3_proc_mknod,
.pc_decode = nfs3svc_decode_mknodargs,
.pc_encode = nfs3svc_encode_createres,
.pc_release = nfs3svc_release_fhandle2,
.pc_argsize = sizeof(struct nfsd3_mknodargs),
.pc_argzero = sizeof(struct nfsd3_mknodargs),
.pc_ressize = sizeof(struct nfsd3_createres),
.pc_cachetype = RC_REPLBUFF,
.pc_xdrressize = ST+(1+FH+pAT)+WC,
.pc_name = "MKNOD",
},
[NFS3PROC_REMOVE] = {
.pc_func = nfsd3_proc_remove,
.pc_decode = nfs3svc_decode_diropargs,
.pc_encode = nfs3svc_encode_wccstatres,
.pc_release = nfs3svc_release_fhandle,
.pc_argsize = sizeof(struct nfsd3_diropargs),
.pc_argzero = sizeof(struct nfsd3_diropargs),
.pc_ressize = sizeof(struct nfsd3_wccstatres),
.pc_cachetype = RC_REPLBUFF,
.pc_xdrressize = ST+WC,
.pc_name = "REMOVE",
},
[NFS3PROC_RMDIR] = {
.pc_func = nfsd3_proc_rmdir,
.pc_decode = nfs3svc_decode_diropargs,
.pc_encode = nfs3svc_encode_wccstatres,
.pc_release = nfs3svc_release_fhandle,
.pc_argsize = sizeof(struct nfsd3_diropargs),
.pc_argzero = sizeof(struct nfsd3_diropargs),
.pc_ressize = sizeof(struct nfsd3_wccstatres),
.pc_cachetype = RC_REPLBUFF,
.pc_xdrressize = ST+WC,
.pc_name = "RMDIR",
},
[NFS3PROC_RENAME] = {
.pc_func = nfsd3_proc_rename,
.pc_decode = nfs3svc_decode_renameargs,
.pc_encode = nfs3svc_encode_renameres,
.pc_release = nfs3svc_release_fhandle2,
.pc_argsize = sizeof(struct nfsd3_renameargs),
.pc_argzero = sizeof(struct nfsd3_renameargs),
.pc_ressize = sizeof(struct nfsd3_renameres),
.pc_cachetype = RC_REPLBUFF,
.pc_xdrressize = ST+WC+WC,
.pc_name = "RENAME",
},
[NFS3PROC_LINK] = {
.pc_func = nfsd3_proc_link,
.pc_decode = nfs3svc_decode_linkargs,
.pc_encode = nfs3svc_encode_linkres,
.pc_release = nfs3svc_release_fhandle2,
.pc_argsize = sizeof(struct nfsd3_linkargs),
.pc_argzero = sizeof(struct nfsd3_linkargs),
.pc_ressize = sizeof(struct nfsd3_linkres),
.pc_cachetype = RC_REPLBUFF,
.pc_xdrressize = ST+pAT+WC,
.pc_name = "LINK",
},
[NFS3PROC_READDIR] = {
.pc_func = nfsd3_proc_readdir,
.pc_decode = nfs3svc_decode_readdirargs,
.pc_encode = nfs3svc_encode_readdirres,
.pc_release = nfs3svc_release_fhandle,
.pc_argsize = sizeof(struct nfsd3_readdirargs),
.pc_argzero = sizeof(struct nfsd3_readdirargs),
.pc_ressize = sizeof(struct nfsd3_readdirres),
.pc_cachetype = RC_NOCACHE,
.pc_name = "READDIR",
},
[NFS3PROC_READDIRPLUS] = {
.pc_func = nfsd3_proc_readdirplus,
.pc_decode = nfs3svc_decode_readdirplusargs,
.pc_encode = nfs3svc_encode_readdirres,
.pc_release = nfs3svc_release_fhandle,
.pc_argsize = sizeof(struct nfsd3_readdirplusargs),
.pc_argzero = sizeof(struct nfsd3_readdirplusargs),
.pc_ressize = sizeof(struct nfsd3_readdirres),
.pc_cachetype = RC_NOCACHE,
.pc_name = "READDIRPLUS",
},
[NFS3PROC_FSSTAT] = {
.pc_func = nfsd3_proc_fsstat,
.pc_decode = nfs3svc_decode_fhandleargs,
.pc_encode = nfs3svc_encode_fsstatres,
.pc_argsize = sizeof(struct nfsd3_fhandleargs),
.pc_argzero = sizeof(struct nfsd3_fhandleargs),
.pc_ressize = sizeof(struct nfsd3_fsstatres),
.pc_cachetype = RC_NOCACHE,
.pc_xdrressize = ST+pAT+2*6+1,
.pc_name = "FSSTAT",
},
[NFS3PROC_FSINFO] = {
.pc_func = nfsd3_proc_fsinfo,
.pc_decode = nfs3svc_decode_fhandleargs,
.pc_encode = nfs3svc_encode_fsinfores,
.pc_argsize = sizeof(struct nfsd3_fhandleargs),
.pc_argzero = sizeof(struct nfsd3_fhandleargs),
.pc_ressize = sizeof(struct nfsd3_fsinfores),
.pc_cachetype = RC_NOCACHE,
.pc_xdrressize = ST+pAT+12,
.pc_name = "FSINFO",
},
[NFS3PROC_PATHCONF] = {
.pc_func = nfsd3_proc_pathconf,
.pc_decode = nfs3svc_decode_fhandleargs,
.pc_encode = nfs3svc_encode_pathconfres,
.pc_argsize = sizeof(struct nfsd3_fhandleargs),
.pc_argzero = sizeof(struct nfsd3_fhandleargs),
.pc_ressize = sizeof(struct nfsd3_pathconfres),
.pc_cachetype = RC_NOCACHE,
.pc_xdrressize = ST+pAT+6,
.pc_name = "PATHCONF",
},
[NFS3PROC_COMMIT] = {
.pc_func = nfsd3_proc_commit,
.pc_decode = nfs3svc_decode_commitargs,
.pc_encode = nfs3svc_encode_commitres,
.pc_release = nfs3svc_release_fhandle,
.pc_argsize = sizeof(struct nfsd3_commitargs),
.pc_argzero = sizeof(struct nfsd3_commitargs),
.pc_ressize = sizeof(struct nfsd3_commitres),
.pc_cachetype = RC_NOCACHE,
.pc_xdrressize = ST+WC+2,
.pc_name = "COMMIT",
},
};
static DEFINE_PER_CPU_ALIGNED(unsigned long,
nfsd_count3[ARRAY_SIZE(nfsd_procedures3)]);
const struct svc_version nfsd_version3 = {
.vs_vers = 3,
.vs_nproc = ARRAY_SIZE(nfsd_procedures3),
.vs_proc = nfsd_procedures3,
.vs_dispatch = nfsd_dispatch,
.vs_count = nfsd_count3,
.vs_xdrsize = NFS3_SVC_XDRSIZE,
};
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