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linux/fs/nfsd/nfs3proc.c

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/*
* linux/fs/nfsd/nfs3proc.c
*
* Process version 3 NFS requests.
*
* Copyright (C) 1996, 1997, 1998 Olaf Kirch <okir@monad.swb.de>
*/
#include <linux/linkage.h>
#include <linux/time.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/ext2_fs.h>
#include <linux/stat.h>
#include <linux/fcntl.h>
#include <linux/net.h>
#include <linux/in.h>
#include <linux/unistd.h>
#include <linux/slab.h>
#include <linux/major.h>
#include <linux/sunrpc/svc.h>
#include <linux/nfsd/nfsd.h>
#include <linux/nfsd/cache.h>
#include <linux/nfsd/xdr3.h>
#include <linux/nfs3.h>
#define NFSDDBG_FACILITY NFSDDBG_PROC
#define RETURN_STATUS(st) { resp->status = (st); return (st); }
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 */
};
/*
* NULL call.
*/
static int
nfsd3_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
{
return nfs_ok;
}
/*
* Get a file's attributes
*/
static int
nfsd3_proc_getattr(struct svc_rqst *rqstp, struct nfsd_fhandle *argp,
struct nfsd3_attrstat *resp)
{
int nfserr;
dprintk("nfsd: GETATTR(3) %s\n",
SVCFH_fmt(&argp->fh));
fh_copy(&resp->fh, &argp->fh);
nfserr = fh_verify(rqstp, &resp->fh, 0, MAY_NOP);
RETURN_STATUS(nfserr);
}
/*
* Set a file's attributes
*/
static int
nfsd3_proc_setattr(struct svc_rqst *rqstp, struct nfsd3_sattrargs *argp,
struct nfsd3_attrstat *resp)
{
int nfserr;
dprintk("nfsd: SETATTR(3) %s\n",
SVCFH_fmt(&argp->fh));
fh_copy(&resp->fh, &argp->fh);
nfserr = nfsd_setattr(rqstp, &resp->fh, &argp->attrs,
argp->check_guard, argp->guardtime);
RETURN_STATUS(nfserr);
}
/*
* Look up a path name component
*/
static int
nfsd3_proc_lookup(struct svc_rqst *rqstp, struct nfsd3_diropargs *argp,
struct nfsd3_diropres *resp)
{
int nfserr;
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);
nfserr = nfsd_lookup(rqstp, &resp->dirfh,
argp->name,
argp->len,
&resp->fh);
RETURN_STATUS(nfserr);
}
/*
* Check file access
*/
static int
nfsd3_proc_access(struct svc_rqst *rqstp, struct nfsd3_accessargs *argp,
struct nfsd3_accessres *resp)
{
int nfserr;
dprintk("nfsd: ACCESS(3) %s 0x%x\n",
SVCFH_fmt(&argp->fh),
argp->access);
fh_copy(&resp->fh, &argp->fh);
resp->access = argp->access;
nfserr = nfsd_access(rqstp, &resp->fh, &resp->access, NULL);
RETURN_STATUS(nfserr);
}
/*
* Read a symlink.
*/
static int
nfsd3_proc_readlink(struct svc_rqst *rqstp, struct nfsd3_readlinkargs *argp,
struct nfsd3_readlinkres *resp)
{
int nfserr;
dprintk("nfsd: READLINK(3) %s\n", SVCFH_fmt(&argp->fh));
/* Read the symlink. */
fh_copy(&resp->fh, &argp->fh);
resp->len = NFS3_MAXPATHLEN;
nfserr = nfsd_readlink(rqstp, &resp->fh, argp->buffer, &resp->len);
RETURN_STATUS(nfserr);
}
/*
* Read a portion of a file.
*/
static int
nfsd3_proc_read(struct svc_rqst *rqstp, struct nfsd3_readargs *argp,
struct nfsd3_readres *resp)
{
int nfserr;
dprintk("nfsd: READ(3) %s %lu bytes at %lu\n",
SVCFH_fmt(&argp->fh),
(unsigned long) argp->count,
(unsigned long) argp->offset);
/* 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;
if (NFSSVC_MAXBLKSIZE < resp->count)
resp->count = NFSSVC_MAXBLKSIZE;
svc_reserve(rqstp, ((1 + NFS3_POST_OP_ATTR_WORDS + 3)<<2) + resp->count +4);
fh_copy(&resp->fh, &argp->fh);
nfserr = nfsd_read(rqstp, &resp->fh, NULL,
argp->offset,
argp->vec, argp->vlen,
&resp->count);
if (nfserr == 0) {
struct inode *inode = resp->fh.fh_dentry->d_inode;
resp->eof = (argp->offset + resp->count) >= inode->i_size;
}
RETURN_STATUS(nfserr);
}
/*
* Write data to a file
*/
static int
nfsd3_proc_write(struct svc_rqst *rqstp, struct nfsd3_writeargs *argp,
struct nfsd3_writeres *resp)
{
int nfserr;
dprintk("nfsd: WRITE(3) %s %d bytes at %ld%s\n",
SVCFH_fmt(&argp->fh),
argp->len,
(unsigned long) argp->offset,
argp->stable? " stable" : "");
fh_copy(&resp->fh, &argp->fh);
resp->committed = argp->stable;
nfserr = nfsd_write(rqstp, &resp->fh, NULL,
argp->offset,
argp->vec, argp->vlen,
argp->len,
&resp->committed);
resp->count = argp->count;
RETURN_STATUS(nfserr);
}
/*
* With NFSv3, CREATE processing is a lot easier than with NFSv2.
* At least in theory; we'll see how it fares in practice when the
* first reports about SunOS compatibility problems start to pour in...
*/
static int
nfsd3_proc_create(struct svc_rqst *rqstp, struct nfsd3_createargs *argp,
struct nfsd3_diropres *resp)
{
svc_fh *dirfhp, *newfhp = NULL;
struct iattr *attr;
u32 nfserr;
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);
attr = &argp->attrs;
/* Get the directory inode */
nfserr = fh_verify(rqstp, dirfhp, S_IFDIR, MAY_CREATE);
if (nfserr)
RETURN_STATUS(nfserr);
/* Unfudge the mode bits */
attr->ia_mode &= ~S_IFMT;
if (!(attr->ia_valid & ATTR_MODE)) {
attr->ia_valid |= ATTR_MODE;
attr->ia_mode = S_IFREG;
} else {
attr->ia_mode = (attr->ia_mode & ~S_IFMT) | S_IFREG;
}
/* Now create the file and set attributes */
nfserr = nfsd_create_v3(rqstp, dirfhp, argp->name, argp->len,
attr, newfhp,
argp->createmode, argp->verf, NULL);
RETURN_STATUS(nfserr);
}
/*
* Make directory. This operation is not idempotent.
*/
static int
nfsd3_proc_mkdir(struct svc_rqst *rqstp, struct nfsd3_createargs *argp,
struct nfsd3_diropres *resp)
{
int nfserr;
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);
nfserr = nfsd_create(rqstp, &resp->dirfh, argp->name, argp->len,
&argp->attrs, S_IFDIR, 0, &resp->fh);
RETURN_STATUS(nfserr);
}
static int
nfsd3_proc_symlink(struct svc_rqst *rqstp, struct nfsd3_symlinkargs *argp,
struct nfsd3_diropres *resp)
{
int nfserr;
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);
nfserr = nfsd_symlink(rqstp, &resp->dirfh, argp->fname, argp->flen,
argp->tname, argp->tlen,
&resp->fh, &argp->attrs);
RETURN_STATUS(nfserr);
}
/*
* Make socket/fifo/device.
*/
static int
nfsd3_proc_mknod(struct svc_rqst *rqstp, struct nfsd3_mknodargs *argp,
struct nfsd3_diropres *resp)
{
int nfserr, 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 == 0 || argp->ftype >= NF3BAD)
RETURN_STATUS(nfserr_inval);
if (argp->ftype == NF3CHR || argp->ftype == NF3BLK) {
rdev = MKDEV(argp->major, argp->minor);
if (MAJOR(rdev) != argp->major ||
MINOR(rdev) != argp->minor)
RETURN_STATUS(nfserr_inval);
} else
if (argp->ftype != NF3SOCK && argp->ftype != NF3FIFO)
RETURN_STATUS(nfserr_inval);
type = nfs3_ftypes[argp->ftype];
nfserr = nfsd_create(rqstp, &resp->dirfh, argp->name, argp->len,
&argp->attrs, type, rdev, &resp->fh);
RETURN_STATUS(nfserr);
}
/*
* Remove file/fifo/socket etc.
*/
static int
nfsd3_proc_remove(struct svc_rqst *rqstp, struct nfsd3_diropargs *argp,
struct nfsd3_attrstat *resp)
{
int nfserr;
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);
nfserr = nfsd_unlink(rqstp, &resp->fh, -S_IFDIR, argp->name, argp->len);
RETURN_STATUS(nfserr);
}
/*
* Remove a directory
*/
static int
nfsd3_proc_rmdir(struct svc_rqst *rqstp, struct nfsd3_diropargs *argp,
struct nfsd3_attrstat *resp)
{
int nfserr;
dprintk("nfsd: RMDIR(3) %s %.*s\n",
SVCFH_fmt(&argp->fh),
argp->len,
argp->name);
fh_copy(&resp->fh, &argp->fh);
nfserr = nfsd_unlink(rqstp, &resp->fh, S_IFDIR, argp->name, argp->len);
RETURN_STATUS(nfserr);
}
static int
nfsd3_proc_rename(struct svc_rqst *rqstp, struct nfsd3_renameargs *argp,
struct nfsd3_renameres *resp)
{
int nfserr;
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);
nfserr = nfsd_rename(rqstp, &resp->ffh, argp->fname, argp->flen,
&resp->tfh, argp->tname, argp->tlen);
RETURN_STATUS(nfserr);
}
static int
nfsd3_proc_link(struct svc_rqst *rqstp, struct nfsd3_linkargs *argp,
struct nfsd3_linkres *resp)
{
int nfserr;
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);
nfserr = nfsd_link(rqstp, &resp->tfh, argp->tname, argp->tlen,
&resp->fh);
RETURN_STATUS(nfserr);
}
/*
* Read a portion of a directory.
*/
static int
nfsd3_proc_readdir(struct svc_rqst *rqstp, struct nfsd3_readdirargs *argp,
struct nfsd3_readdirres *resp)
{
int nfserr, count;
dprintk("nfsd: READDIR(3) %s %d bytes at %d\n",
SVCFH_fmt(&argp->fh),
argp->count, (u32) argp->cookie);
/* Make sure we've room for the NULL ptr & eof flag, and shrink to
* client read size */
count = (argp->count >> 2) - 2;
/* Read directory and encode entries on the fly */
fh_copy(&resp->fh, &argp->fh);
resp->buflen = count;
resp->common.err = nfs_ok;
resp->buffer = argp->buffer;
resp->rqstp = rqstp;
nfserr = nfsd_readdir(rqstp, &resp->fh, (loff_t*) &argp->cookie,
&resp->common, nfs3svc_encode_entry);
memcpy(resp->verf, argp->verf, 8);
resp->count = resp->buffer - argp->buffer;
if (resp->offset)
xdr_encode_hyper(resp->offset, argp->cookie);
RETURN_STATUS(nfserr);
}
/*
* Read a portion of a directory, including file handles and attrs.
* For now, we choose to ignore the dircount parameter.
*/
static int
nfsd3_proc_readdirplus(struct svc_rqst *rqstp, struct nfsd3_readdirargs *argp,
struct nfsd3_readdirres *resp)
{
int nfserr, count = 0;
loff_t offset;
int i;
caddr_t page_addr = NULL;
dprintk("nfsd: READDIR+(3) %s %d bytes at %d\n",
SVCFH_fmt(&argp->fh),
argp->count, (u32) argp->cookie);
/* Convert byte count to number of words (i.e. >> 2),
* and reserve room for the NULL ptr & eof flag (-2 words) */
resp->count = (argp->count >> 2) - 2;
/* Read directory and encode entries on the fly */
fh_copy(&resp->fh, &argp->fh);
resp->common.err = nfs_ok;
resp->buffer = argp->buffer;
resp->buflen = resp->count;
resp->rqstp = rqstp;
offset = argp->cookie;
nfserr = nfsd_readdir(rqstp, &resp->fh,
&offset,
&resp->common,
nfs3svc_encode_entry_plus);
memcpy(resp->verf, argp->verf, 8);
for (i=1; i<rqstp->rq_resused ; i++) {
page_addr = page_address(rqstp->rq_respages[i]);
if (((caddr_t)resp->buffer >= page_addr) &&
((caddr_t)resp->buffer < page_addr + PAGE_SIZE)) {
count += (caddr_t)resp->buffer - page_addr;
break;
}
count += PAGE_SIZE;
}
resp->count = count >> 2;
if (resp->offset) {
if (unlikely(resp->offset1)) {
/* we ended up with offset on a page boundary */
*resp->offset = htonl(offset >> 32);
*resp->offset1 = htonl(offset & 0xffffffff);
resp->offset1 = NULL;
} else {
xdr_encode_hyper(resp->offset, offset);
}
}
RETURN_STATUS(nfserr);
}
/*
* Get file system stats
*/
static int
nfsd3_proc_fsstat(struct svc_rqst * rqstp, struct nfsd_fhandle *argp,
struct nfsd3_fsstatres *resp)
{
int nfserr;
dprintk("nfsd: FSSTAT(3) %s\n",
SVCFH_fmt(&argp->fh));
nfserr = nfsd_statfs(rqstp, &argp->fh, &resp->stats);
fh_put(&argp->fh);
RETURN_STATUS(nfserr);
}
/*
* Get file system info
*/
static int
nfsd3_proc_fsinfo(struct svc_rqst * rqstp, struct nfsd_fhandle *argp,
struct nfsd3_fsinfores *resp)
{
int nfserr;
dprintk("nfsd: FSINFO(3) %s\n",
SVCFH_fmt(&argp->fh));
resp->f_rtmax = NFSSVC_MAXBLKSIZE;
resp->f_rtpref = NFSSVC_MAXBLKSIZE;
resp->f_rtmult = PAGE_SIZE;
resp->f_wtmax = NFSSVC_MAXBLKSIZE;
resp->f_wtpref = NFSSVC_MAXBLKSIZE;
resp->f_wtmult = PAGE_SIZE;
resp->f_dtpref = PAGE_SIZE;
resp->f_maxfilesize = ~(u32) 0;
resp->f_properties = NFS3_FSF_DEFAULT;
nfserr = fh_verify(rqstp, &argp->fh, 0, MAY_NOP);
/* Check special features of the file system. May request
* different read/write sizes for file systems known to have
* problems with large blocks */
if (nfserr == 0) {
struct super_block *sb = argp->fh.fh_dentry->d_inode->i_sb;
/* Note that we don't care for remote fs's here */
if (sb->s_magic == 0x4d44 /* MSDOS_SUPER_MAGIC */) {
resp->f_properties = NFS3_FSF_BILLYBOY;
}
resp->f_maxfilesize = sb->s_maxbytes;
}
fh_put(&argp->fh);
RETURN_STATUS(nfserr);
}
/*
* Get pathconf info for the specified file
*/
static int
nfsd3_proc_pathconf(struct svc_rqst * rqstp, struct nfsd_fhandle *argp,
struct nfsd3_pathconfres *resp)
{
int nfserr;
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;
nfserr = fh_verify(rqstp, &argp->fh, 0, MAY_NOP);
if (nfserr == 0) {
struct super_block *sb = argp->fh.fh_dentry->d_inode->i_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 0x4d44: /* MSDOS_SUPER_MAGIC */
resp->p_case_insensitive = 1;
resp->p_case_preserving = 0;
break;
}
}
fh_put(&argp->fh);
RETURN_STATUS(nfserr);
}
/*
* Commit a file (range) to stable storage.
*/
static int
nfsd3_proc_commit(struct svc_rqst * rqstp, struct nfsd3_commitargs *argp,
struct nfsd3_commitres *resp)
{
int nfserr;
dprintk("nfsd: COMMIT(3) %s %u@%Lu\n",
SVCFH_fmt(&argp->fh),
argp->count,
(unsigned long long) argp->offset);
if (argp->offset > NFS_OFFSET_MAX)
RETURN_STATUS(nfserr_inval);
fh_copy(&resp->fh, &argp->fh);
nfserr = nfsd_commit(rqstp, &resp->fh, argp->offset, argp->count);
RETURN_STATUS(nfserr);
}
/*
* NFSv3 Server procedures.
* Only the results of non-idempotent operations are cached.
*/
#define nfs3svc_decode_voidargs NULL
#define nfs3svc_release_void NULL
#define nfs3svc_decode_fhandleargs nfs3svc_decode_fhandle
#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_fhandleres nfsd3_attrstat
#define nfsd3_attrstatres nfsd3_attrstat
#define nfsd3_wccstatres nfsd3_attrstat
#define nfsd3_createres nfsd3_diropres
#define nfsd3_voidres nfsd3_voidargs
struct nfsd3_voidargs { int dummy; };
#define PROC(name, argt, rest, relt, cache, respsize) \
{ (svc_procfunc) nfsd3_proc_##name, \
(kxdrproc_t) nfs3svc_decode_##argt##args, \
(kxdrproc_t) nfs3svc_encode_##rest##res, \
(kxdrproc_t) nfs3svc_release_##relt, \
sizeof(struct nfsd3_##argt##args), \
sizeof(struct nfsd3_##rest##res), \
0, \
cache, \
respsize, \
}
#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 struct svc_procedure nfsd_procedures3[22] = {
PROC(null, void, void, void, RC_NOCACHE, ST),
PROC(getattr, fhandle, attrstat, fhandle, RC_NOCACHE, ST+AT),
PROC(setattr, sattr, wccstat, fhandle, RC_REPLBUFF, ST+WC),
PROC(lookup, dirop, dirop, fhandle2, RC_NOCACHE, ST+FH+pAT+pAT),
PROC(access, access, access, fhandle, RC_NOCACHE, ST+pAT+1),
PROC(readlink, readlink, readlink, fhandle, RC_NOCACHE, ST+pAT+1+NFS3_MAXPATHLEN/4),
PROC(read, read, read, fhandle, RC_NOCACHE, ST+pAT+4+NFSSVC_MAXBLKSIZE),
PROC(write, write, write, fhandle, RC_REPLBUFF, ST+WC+4),
PROC(create, create, create, fhandle2, RC_REPLBUFF, ST+(1+FH+pAT)+WC),
PROC(mkdir, mkdir, create, fhandle2, RC_REPLBUFF, ST+(1+FH+pAT)+WC),
PROC(symlink, symlink, create, fhandle2, RC_REPLBUFF, ST+(1+FH+pAT)+WC),
PROC(mknod, mknod, create, fhandle2, RC_REPLBUFF, ST+(1+FH+pAT)+WC),
PROC(remove, dirop, wccstat, fhandle, RC_REPLBUFF, ST+WC),
PROC(rmdir, dirop, wccstat, fhandle, RC_REPLBUFF, ST+WC),
PROC(rename, rename, rename, fhandle2, RC_REPLBUFF, ST+WC+WC),
PROC(link, link, link, fhandle2, RC_REPLBUFF, ST+pAT+WC),
PROC(readdir, readdir, readdir, fhandle, RC_NOCACHE, 0),
PROC(readdirplus,readdirplus, readdir, fhandle, RC_NOCACHE, 0),
PROC(fsstat, fhandle, fsstat, void, RC_NOCACHE, ST+pAT+2*6+1),
PROC(fsinfo, fhandle, fsinfo, void, RC_NOCACHE, ST+pAT+12),
PROC(pathconf, fhandle, pathconf, void, RC_NOCACHE, ST+pAT+6),
PROC(commit, commit, commit, fhandle, RC_NOCACHE, ST+WC+2),
};
struct svc_version nfsd_version3 = {
.vs_vers = 3,
.vs_nproc = 22,
.vs_proc = nfsd_procedures3,
.vs_dispatch = nfsd_dispatch,
.vs_xdrsize = NFS3_SVC_XDRSIZE,
};
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