nfs3proc.c
上传用户:jlfgdled
上传日期:2013-04-10
资源大小:33168k
文件大小:15k
- /*
- * 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 getrootn");
- fattr->valid = 0;
- status = rpc_call(server->client, NFS3PROC_GETATTR, fhandle, fattr, 0);
- dprintk("NFS reply getrootn");
- 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 getattrn");
- fattr->valid = 0;
- status = rpc_call(NFS_CLIENT(inode), NFS3PROC_GETATTR,
- NFS_FH(inode), fattr, 0);
- dprintk("NFS reply getattrn");
- 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 setattrn");
- fattr->valid = 0;
- status = rpc_call(NFS_CLIENT(inode), NFS3PROC_SETATTR, &arg, fattr, 0);
- dprintk("NFS reply setattrn");
- 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 %sn", 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: %dn", status);
- if (status >= 0)
- 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 accessn");
- 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 accessn");
- if (status == 0 && (arg.access & res.access) != arg.access)
- status = -EACCES;
- return status;
- }
- static int
- nfs3_proc_readlink(struct inode *inode, struct page *page)
- {
- struct nfs_fattr fattr;
- struct nfs3_readlinkargs args = { NFS_FH(inode), PAGE_CACHE_SIZE, &page };
- int status;
- dprintk("NFS call readlinkn");
- fattr.valid = 0;
- status = rpc_call(NFS_CLIENT(inode), NFS3PROC_READLINK,
- &args, &fattr, 0);
- nfs_refresh_inode(inode, &fattr);
- dprintk("NFS reply readlink: %dn", status);
- return status;
- }
- static int
- nfs3_proc_read(struct inode *inode, struct rpc_cred *cred,
- struct nfs_fattr *fattr, int flags,
- unsigned int base, unsigned int count, struct page *page,
- int *eofp)
- {
- u64 offset = page_offset(page) + base;
- struct nfs_readargs arg = { NFS_FH(inode), offset, count,
- base, &page };
- struct nfs_readres res = { fattr, count, 0 };
- struct rpc_message msg = { NFS3PROC_READ, &arg, &res, cred };
- int status;
- dprintk("NFS call read %d @ %Ldn", count, (long long)offset);
- fattr->valid = 0;
- status = rpc_call_sync(NFS_CLIENT(inode), &msg, flags);
- dprintk("NFS reply read: %dn", status);
- *eofp = res.eof;
- return status;
- }
- static int
- nfs3_proc_write(struct inode *inode, struct rpc_cred *cred,
- struct nfs_fattr *fattr, int flags,
- unsigned int base, unsigned int count,
- struct page *page, struct nfs_writeverf *verf)
- {
- u64 offset = page_offset(page) + base;
- struct nfs_writeargs arg = { NFS_FH(inode), offset, count,
- NFS_FILE_SYNC, base, &page };
- 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 @ %Ldn", 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: %dn", 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 %sn", 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: %dn", 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): %dn", 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 %sn", 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: %dn", 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 -> %sn", 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: %dn", 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 %sn", 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: %dn", 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 -> %sn", 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: %dn", 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 %sn", 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: %dn", 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 %sn", 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: %dn", 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, struct page *page, unsigned int count, int plus)
- {
- struct nfs_fattr dir_attr;
- u32 *verf = NFS_COOKIEVERF(dir);
- struct nfs3_readdirargs arg = { NFS_FH(dir), cookie, {verf[0], verf[1]},
- plus, count, &page };
- struct nfs3_readdirres res = { &dir_attr, verf, plus };
- struct rpc_message msg = { NFS3PROC_READDIR, &arg, &res, cred };
- int status;
- if (plus)
- msg.rpc_proc = NFS3PROC_READDIRPLUS;
- dprintk("NFS call readdir%s %dn",
- 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: %dn", 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 %xn", 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: %dn", 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 fsstatn");
- 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: %dn", 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,
- };