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/*
* linux/fs/nfs/nfs3proc.c
*
* Client-side NFSv3 procedures stubs.
*
* Copyright (C) 1997, Olaf Kirch
*/
#include <linux/mm.h>
#include <linux/utsname.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/sunrpc/clnt.h>
#include <linux/nfs.h>
#include <linux/nfs3.h>
#include <linux/nfs_fs.h>
#define NFSDBG_FACILITY NFSDBG_PROC
/* A wrapper to handle the EJUKEBOX error message */
static int
nfs3_rpc_wrapper(struct rpc_clnt *clnt, struct rpc_message *msg, int flags)
{
sigset_t oldset;
int res;
rpc_clnt_sigmask(clnt, &oldset);
do {
res = rpc_call_sync(clnt, msg, flags);
if (res != -EJUKEBOX)
break;
set_current_state(TASK_INTERRUPTIBLE);
schedule_timeout(NFS_JUKEBOX_RETRY_TIME);
res = -ERESTARTSYS;
} while (!signalled());
rpc_clnt_sigunmask(clnt, &oldset);
return res;
}
static inline int
nfs3_rpc_call_wrapper(struct rpc_clnt *clnt, u32 proc, void *argp, void *resp, int flags)
{
struct rpc_message msg = { proc, argp, resp, NULL };
return nfs3_rpc_wrapper(clnt, &msg, flags);
}
#define rpc_call(clnt, proc, argp, resp, flags) \
nfs3_rpc_call_wrapper(clnt, proc, argp, resp, flags)
#define rpc_call_sync(clnt, msg, flags) \
nfs3_rpc_wrapper(clnt, msg, flags)
/*
* Bare-bones access to getattr: this is for nfs_read_super.
*/
static int
nfs3_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
struct nfs_fattr *fattr)
{
int status;
dprintk("NFS call getroot\n");
fattr->valid = 0;
status = rpc_call(server->client, NFS3PROC_GETATTR, fhandle, fattr, 0);
dprintk("NFS reply getroot\n");
return status;
}
/*
* One function for each procedure in the NFS protocol.
*/
static int
nfs3_proc_getattr(struct inode *inode, struct nfs_fattr *fattr)
{
int status;
dprintk("NFS call getattr\n");
fattr->valid = 0;
status = rpc_call(NFS_CLIENT(inode), NFS3PROC_GETATTR,
NFS_FH(inode), fattr, 0);
dprintk("NFS reply getattr\n");
return status;
}
static int
nfs3_proc_setattr(struct inode *inode, struct nfs_fattr *fattr,
struct iattr *sattr)
{
struct nfs3_sattrargs arg = { NFS_FH(inode), sattr, 0, 0 };
int status;
dprintk("NFS call setattr\n");
fattr->valid = 0;
status = rpc_call(NFS_CLIENT(inode), NFS3PROC_SETATTR, &arg, fattr, 0);
dprintk("NFS reply setattr\n");
return status;
}
static int
nfs3_proc_lookup(struct inode *dir, struct qstr *name,
struct nfs_fh *fhandle, struct nfs_fattr *fattr)
{
struct nfs_fattr dir_attr;
struct nfs3_diropargs arg = { NFS_FH(dir), name->name, name->len };
struct nfs3_diropres res = { &dir_attr, fhandle, fattr };
int status;
dprintk("NFS call lookup %s\n", name->name);
dir_attr.valid = 0;
fattr->valid = 0;
status = rpc_call(NFS_CLIENT(dir), NFS3PROC_LOOKUP, &arg, &res, 0);
if (status >= 0 && !(fattr->valid & NFS_ATTR_FATTR))
status = rpc_call(NFS_CLIENT(dir), NFS3PROC_GETATTR,
fhandle, fattr, 0);
dprintk("NFS reply lookup: %d\n", status);
nfs_refresh_inode(dir, &dir_attr);
return status;
}
static int
nfs3_proc_access(struct inode *inode, int mode, int ruid)
{
struct nfs_fattr fattr;
struct nfs3_accessargs arg = { NFS_FH(inode), 0 };
struct nfs3_accessres res = { &fattr, 0 };
int status, flags;
dprintk("NFS call access\n");
fattr.valid = 0;
if (mode & MAY_READ)
arg.access |= NFS3_ACCESS_READ;
if (S_ISDIR(inode->i_mode)) {
if (mode & MAY_WRITE)
arg.access |= NFS3_ACCESS_MODIFY | NFS3_ACCESS_EXTEND | NFS3_ACCESS_DELETE;
if (mode & MAY_EXEC)
arg.access |= NFS3_ACCESS_LOOKUP;
} else {
if (mode & MAY_WRITE)
arg.access |= NFS3_ACCESS_MODIFY | NFS3_ACCESS_EXTEND;
if (mode & MAY_EXEC)
arg.access |= NFS3_ACCESS_EXECUTE;
}
flags = (ruid) ? RPC_CALL_REALUID : 0;
status = rpc_call(NFS_CLIENT(inode), NFS3PROC_ACCESS, &arg, &res, flags);
nfs_refresh_inode(inode, &fattr);
dprintk("NFS reply access\n");
if (status == 0 && (arg.access & res.access) != arg.access)
status = -EACCES;
return status;
}
static int
nfs3_proc_readlink(struct inode *inode, void *buffer, unsigned int buflen)
{
struct nfs_fattr fattr;
struct nfs3_readlinkargs args = { NFS_FH(inode), buffer, buflen };
struct nfs3_readlinkres res = { &fattr, buffer, buflen };
int status;
dprintk("NFS call readlink\n");
fattr.valid = 0;
status = rpc_call(NFS_CLIENT(inode), NFS3PROC_READLINK,
&args, &res, 0);
nfs_refresh_inode(inode, &fattr);
dprintk("NFS reply readlink: %d\n", status);
return status;
}
static int
nfs3_proc_read(struct inode *inode, struct rpc_cred *cred,
struct nfs_fattr *fattr, int flags,
loff_t offset, unsigned int count, void *buffer, int *eofp)
{
struct nfs_readargs arg = { NFS_FH(inode), offset, count, 1,
{{buffer, count}, {0,0}, {0,0}, {0,0},
{0,0}, {0,0}, {0,0}, {0,0}} };
struct nfs_readres res = { fattr, count, 0 };
struct rpc_message msg = { NFS3PROC_READ, &arg, &res, cred };
int status;
dprintk("NFS call read %d @ %Ld\n", count, (long long)offset);
fattr->valid = 0;
status = rpc_call_sync(NFS_CLIENT(inode), &msg, flags);
dprintk("NFS reply read: %d\n", status);
*eofp = res.eof;
return status;
}
static int
nfs3_proc_write(struct inode *inode, struct rpc_cred *cred,
struct nfs_fattr *fattr, int flags,
loff_t offset, unsigned int count,
void *buffer, struct nfs_writeverf *verf)
{
struct nfs_writeargs arg = { NFS_FH(inode), offset, count,
NFS_FILE_SYNC, 1,
{{buffer, count}, {0,0}, {0,0}, {0,0},
{0,0}, {0,0}, {0,0}, {0,0}} };
struct nfs_writeres res = { fattr, verf, 0 };
struct rpc_message msg = { NFS3PROC_WRITE, &arg, &res, cred };
int status, rpcflags = 0;
dprintk("NFS call write %d @ %Ld\n", count, (long long)offset);
fattr->valid = 0;
if (flags & NFS_RW_SWAP)
rpcflags |= NFS_RPC_SWAPFLAGS;
arg.stable = (flags & NFS_RW_SYNC) ? NFS_FILE_SYNC : NFS_UNSTABLE;
status = rpc_call_sync(NFS_CLIENT(inode), &msg, rpcflags);
dprintk("NFS reply read: %d\n", status);
return status < 0? status : res.count;
}
/*
* Create a regular file.
* For now, we don't implement O_EXCL.
*/
static int
nfs3_proc_create(struct inode *dir, struct qstr *name, struct iattr *sattr,
int flags, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
{
struct nfs_fattr dir_attr;
struct nfs3_createargs arg = { NFS_FH(dir), name->name, name->len,
sattr, 0, { 0, 0 } };
struct nfs3_diropres res = { &dir_attr, fhandle, fattr };
int status;
dprintk("NFS call create %s\n", name->name);
arg.createmode = NFS3_CREATE_UNCHECKED;
if (flags & O_EXCL) {
arg.createmode = NFS3_CREATE_EXCLUSIVE;
arg.verifier[0] = jiffies;
arg.verifier[1] = current->pid;
}
again:
dir_attr.valid = 0;
fattr->valid = 0;
status = rpc_call(NFS_CLIENT(dir), NFS3PROC_CREATE, &arg, &res, 0);
nfs_refresh_inode(dir, &dir_attr);
/* If the server doesn't support the exclusive creation semantics,
* try again with simple 'guarded' mode. */
if (status == NFSERR_NOTSUPP) {
switch (arg.createmode) {
case NFS3_CREATE_EXCLUSIVE:
arg.createmode = NFS3_CREATE_GUARDED;
break;
case NFS3_CREATE_GUARDED:
arg.createmode = NFS3_CREATE_UNCHECKED;
break;
case NFS3_CREATE_UNCHECKED:
goto exit;
}
goto again;
}
exit:
dprintk("NFS reply create: %d\n", status);
/* When we created the file with exclusive semantics, make
* sure we set the attributes afterwards. */
if (status == 0 && arg.createmode == NFS3_CREATE_EXCLUSIVE) {
struct nfs3_sattrargs arg = { fhandle, sattr, 0, 0 };
dprintk("NFS call setattr (post-create)\n");
/* Note: we could use a guarded setattr here, but I'm
* not sure this buys us anything (and I'd have
* to revamp the NFSv3 XDR code) */
fattr->valid = 0;
status = rpc_call(NFS_CLIENT(dir), NFS3PROC_SETATTR,
&arg, fattr, 0);
dprintk("NFS reply setattr (post-create): %d\n", status);
}
return status;
}
static int
nfs3_proc_remove(struct inode *dir, struct qstr *name)
{
struct nfs_fattr dir_attr;
struct nfs3_diropargs arg = { NFS_FH(dir), name->name, name->len };
struct rpc_message msg = { NFS3PROC_REMOVE, &arg, &dir_attr, NULL };
int status;
dprintk("NFS call remove %s\n", name->name);
dir_attr.valid = 0;
status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
nfs_refresh_inode(dir, &dir_attr);
dprintk("NFS reply remove: %d\n", status);
return status;
}
static int
nfs3_proc_unlink_setup(struct rpc_message *msg, struct dentry *dir, struct qstr *name)
{
struct nfs3_diropargs *arg;
struct nfs_fattr *res;
arg = (struct nfs3_diropargs *)kmalloc(sizeof(*arg)+sizeof(*res), GFP_KERNEL);
if (!arg)
return -ENOMEM;
res = (struct nfs_fattr*)(arg + 1);
arg->fh = NFS_FH(dir->d_inode);
arg->name = name->name;
arg->len = name->len;
res->valid = 0;
msg->rpc_proc = NFS3PROC_REMOVE;
msg->rpc_argp = arg;
msg->rpc_resp = res;
return 0;
}
static void
nfs3_proc_unlink_done(struct dentry *dir, struct rpc_message *msg)
{
struct nfs_fattr *dir_attr;
if (msg->rpc_argp) {
dir_attr = (struct nfs_fattr*)msg->rpc_resp;
nfs_refresh_inode(dir->d_inode, dir_attr);
kfree(msg->rpc_argp);
}
}
static int
nfs3_proc_rename(struct inode *old_dir, struct qstr *old_name,
struct inode *new_dir, struct qstr *new_name)
{
struct nfs_fattr old_dir_attr, new_dir_attr;
struct nfs3_renameargs arg = { NFS_FH(old_dir),
old_name->name, old_name->len,
NFS_FH(new_dir),
new_name->name, new_name->len };
struct nfs3_renameres res = { &old_dir_attr, &new_dir_attr };
int status;
dprintk("NFS call rename %s -> %s\n", old_name->name, new_name->name);
old_dir_attr.valid = 0;
new_dir_attr.valid = 0;
status = rpc_call(NFS_CLIENT(old_dir), NFS3PROC_RENAME, &arg, &res, 0);
nfs_refresh_inode(old_dir, &old_dir_attr);
nfs_refresh_inode(new_dir, &new_dir_attr);
dprintk("NFS reply rename: %d\n", status);
return status;
}
static int
nfs3_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
{
struct nfs_fattr dir_attr, fattr;
struct nfs3_linkargs arg = { NFS_FH(inode), NFS_FH(dir),
name->name, name->len };
struct nfs3_linkres res = { &dir_attr, &fattr };
int status;
dprintk("NFS call link %s\n", name->name);
dir_attr.valid = 0;
fattr.valid = 0;
status = rpc_call(NFS_CLIENT(inode), NFS3PROC_LINK, &arg, &res, 0);
nfs_refresh_inode(dir, &dir_attr);
nfs_refresh_inode(inode, &fattr);
dprintk("NFS reply link: %d\n", status);
return status;
}
static int
nfs3_proc_symlink(struct inode *dir, struct qstr *name, struct qstr *path,
struct iattr *sattr, struct nfs_fh *fhandle,
struct nfs_fattr *fattr)
{
struct nfs_fattr dir_attr;
struct nfs3_symlinkargs arg = { NFS_FH(dir), name->name, name->len,
path->name, path->len, sattr };
struct nfs3_diropres res = { &dir_attr, fhandle, fattr };
int status;
dprintk("NFS call symlink %s -> %s\n", name->name, path->name);
dir_attr.valid = 0;
fattr->valid = 0;
status = rpc_call(NFS_CLIENT(dir), NFS3PROC_SYMLINK, &arg, &res, 0);
nfs_refresh_inode(dir, &dir_attr);
dprintk("NFS reply symlink: %d\n", status);
return status;
}
static int
nfs3_proc_mkdir(struct inode *dir, struct qstr *name, struct iattr *sattr,
struct nfs_fh *fhandle, struct nfs_fattr *fattr)
{
struct nfs_fattr dir_attr;
struct nfs3_mkdirargs arg = { NFS_FH(dir), name->name, name->len,
sattr };
struct nfs3_diropres res = { &dir_attr, fhandle, fattr };
int status;
dprintk("NFS call mkdir %s\n", name->name);
dir_attr.valid = 0;
fattr->valid = 0;
status = rpc_call(NFS_CLIENT(dir), NFS3PROC_MKDIR, &arg, &res, 0);
nfs_refresh_inode(dir, &dir_attr);
dprintk("NFS reply mkdir: %d\n", status);
return status;
}
static int
nfs3_proc_rmdir(struct inode *dir, struct qstr *name)
{
struct nfs_fattr dir_attr;
struct nfs3_diropargs arg = { NFS_FH(dir), name->name, name->len };
int status;
dprintk("NFS call rmdir %s\n", name->name);
dir_attr.valid = 0;
status = rpc_call(NFS_CLIENT(dir), NFS3PROC_RMDIR, &arg, &dir_attr, 0);
nfs_refresh_inode(dir, &dir_attr);
dprintk("NFS reply rmdir: %d\n", status);
return status;
}
/*
* The READDIR implementation is somewhat hackish - we pass the user buffer
* to the encode function, which installs it in the receive iovec.
* The decode function itself doesn't perform any decoding, it just makes
* sure the reply is syntactically correct.
*
* Also note that this implementation handles both plain readdir and
* readdirplus.
*/
static int
nfs3_proc_readdir(struct inode *dir, struct rpc_cred *cred,
u64 cookie, void *entry,
unsigned int size, int plus)
{
struct nfs_fattr dir_attr;
struct nfs3_readdirargs arg = { NFS_FH(dir), cookie, {0, 0}, 0, 0, 0 };
struct nfs3_readdirres res = { &dir_attr, 0, 0, 0, 0 };
struct rpc_message msg = { NFS3PROC_READDIR, &arg, &res, cred };
u32 *verf = NFS_COOKIEVERF(dir);
int status;
arg.buffer = entry;
arg.bufsiz = size;
arg.verf[0] = verf[0];
arg.verf[1] = verf[1];
arg.plus = plus;
res.buffer = entry;
res.bufsiz = size;
res.verf = verf;
res.plus = plus;
if (plus)
msg.rpc_proc = NFS3PROC_READDIRPLUS;
dprintk("NFS call readdir%s %d\n",
plus? "plus" : "", (unsigned int) cookie);
dir_attr.valid = 0;
status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
nfs_refresh_inode(dir, &dir_attr);
dprintk("NFS reply readdir: %d\n", status);
return status;
}
static int
nfs3_proc_mknod(struct inode *dir, struct qstr *name, struct iattr *sattr,
dev_t rdev, struct nfs_fh *fh, struct nfs_fattr *fattr)
{
struct nfs_fattr dir_attr;
struct nfs3_mknodargs arg = { NFS_FH(dir), name->name, name->len, 0,
sattr, rdev };
struct nfs3_diropres res = { &dir_attr, fh, fattr };
int status;
switch (sattr->ia_mode & S_IFMT) {
case S_IFBLK: arg.type = NF3BLK; break;
case S_IFCHR: arg.type = NF3CHR; break;
case S_IFIFO: arg.type = NF3FIFO; break;
case S_IFSOCK: arg.type = NF3SOCK; break;
default: return -EINVAL;
}
dprintk("NFS call mknod %s %x\n", name->name, rdev);
dir_attr.valid = 0;
fattr->valid = 0;
status = rpc_call(NFS_CLIENT(dir), NFS3PROC_MKNOD, &arg, &res, 0);
nfs_refresh_inode(dir, &dir_attr);
dprintk("NFS reply mknod: %d\n", status);
return status;
}
/*
* This is a combo call of fsstat and fsinfo
*/
static int
nfs3_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
struct nfs_fsinfo *info)
{
int status;
dprintk("NFS call fsstat\n");
memset((char *)info, 0, sizeof(*info));
status = rpc_call(server->client, NFS3PROC_FSSTAT, fhandle, info, 0);
if (status < 0)
goto error;
status = rpc_call(server->client, NFS3PROC_FSINFO, fhandle, info, 0);
error:
dprintk("NFS reply statfs: %d\n", status);
return status;
}
extern u32 *nfs3_decode_dirent(u32 *, struct nfs_entry *, int);
struct nfs_rpc_ops nfs_v3_clientops = {
3, /* protocol version */
nfs3_proc_get_root,
nfs3_proc_getattr,
nfs3_proc_setattr,
nfs3_proc_lookup,
nfs3_proc_access,
nfs3_proc_readlink,
nfs3_proc_read,
nfs3_proc_write,
NULL, /* commit */
nfs3_proc_create,
nfs3_proc_remove,
nfs3_proc_unlink_setup,
nfs3_proc_unlink_done,
nfs3_proc_rename,
nfs3_proc_link,
nfs3_proc_symlink,
nfs3_proc_mkdir,
nfs3_proc_rmdir,
nfs3_proc_readdir,
nfs3_proc_mknod,
nfs3_proc_statfs,
nfs3_decode_dirent,
};
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