| /* |
| * 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); |
| 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 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, struct page *page) |
| { |
| struct nfs_fattr fattr; |
| struct nfs3_readlinkargs args = { NFS_FH(inode), PAGE_CACHE_SIZE, &page }; |
| int status; |
| |
| dprintk("NFS call readlink\n"); |
| fattr.valid = 0; |
| status = rpc_call(NFS_CLIENT(inode), NFS3PROC_READLINK, |
| &args, &fattr, 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, |
| 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 @ %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, |
| 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 @ %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; |
| struct unlinkxdr { |
| struct nfs3_diropargs arg; |
| struct nfs_fattr res; |
| } *ptr; |
| |
| ptr = (struct unlinkxdr *)kmalloc(sizeof(*ptr), GFP_KERNEL); |
| if (!ptr) |
| return -ENOMEM; |
| arg = &ptr->arg; |
| res = &ptr->res; |
| 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. |
| * |
| */ |
| 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; |
| |
| dprintk("NFS call readdir %d\n", (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, |
| }; |