/* * 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> #include <linux/nfs_page.h> #include <linux/lockd/bind.h> #include <linux/nfs_mount.h> #include "iostat.h" #include "internal.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) { int res; do { res = rpc_call_sync(clnt, msg, flags); if (res != -EJUKEBOX) break; schedule_timeout_killable(NFS_JUKEBOX_RETRY_TIME); res = -ERESTARTSYS; } while (!fatal_signal_pending(current)); return res; } #define rpc_call_sync(clnt, msg, flags) nfs3_rpc_wrapper(clnt, msg, flags) static int nfs3_async_handle_jukebox(struct rpc_task *task, struct inode *inode) { if (task->tk_status != -EJUKEBOX) return 0; nfs_inc_stats(inode, NFSIOS_DELAY); task->tk_status = 0; rpc_restart_call(task); rpc_delay(task, NFS_JUKEBOX_RETRY_TIME); return 1; } static int do_proc_get_root(struct rpc_clnt *client, struct nfs_fh *fhandle, struct nfs_fsinfo *info) { struct rpc_message msg = { .rpc_proc = &nfs3_procedures[NFS3PROC_FSINFO], .rpc_argp = fhandle, .rpc_resp = info, }; int status; dprintk("%s: call fsinfo\n", __func__); nfs_fattr_init(info->fattr); status = rpc_call_sync(client, &msg, 0); dprintk("%s: reply fsinfo: %d\n", __func__, status); if (!(info->fattr->valid & NFS_ATTR_FATTR)) { msg.rpc_proc = &nfs3_procedures[NFS3PROC_GETATTR]; msg.rpc_resp = info->fattr; status = rpc_call_sync(client, &msg, 0); dprintk("%s: reply getattr: %d\n", __func__, status); } return status; } /* * Bare-bones access to getattr: this is for nfs_get_root/nfs_get_sb */ static int nfs3_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *info) { int status; status = do_proc_get_root(server->client, fhandle, info); if (status && server->nfs_client->cl_rpcclient != server->client) status = do_proc_get_root(server->nfs_client->cl_rpcclient, fhandle, info); return status; } /* * One function for each procedure in the NFS protocol. */ static int nfs3_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr) { struct rpc_message msg = { .rpc_proc = &nfs3_procedures[NFS3PROC_GETATTR], .rpc_argp = fhandle, .rpc_resp = fattr, }; int status; dprintk("NFS call getattr\n"); nfs_fattr_init(fattr); status = rpc_call_sync(server->client, &msg, 0); dprintk("NFS reply getattr: %d\n", status); return status; } static int nfs3_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr, struct iattr *sattr) { struct inode *inode = dentry->d_inode; struct nfs3_sattrargs arg = { .fh = NFS_FH(inode), .sattr = sattr, }; struct rpc_message msg = { .rpc_proc = &nfs3_procedures[NFS3PROC_SETATTR], .rpc_argp = &arg, .rpc_resp = fattr, }; int status; dprintk("NFS call setattr\n"); nfs_fattr_init(fattr); status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0); if (status == 0) nfs_setattr_update_inode(inode, sattr); dprintk("NFS reply setattr: %d\n", status); 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 = { .fh = NFS_FH(dir), .name = name->name, .len = name->len }; struct nfs3_diropres res = { .dir_attr = &dir_attr, .fh = fhandle, .fattr = fattr }; struct rpc_message msg = { .rpc_proc = &nfs3_procedures[NFS3PROC_LOOKUP], .rpc_argp = &arg, .rpc_resp = &res, }; int status; dprintk("NFS call lookup %s\n", name->name); nfs_fattr_init(&dir_attr); nfs_fattr_init(fattr); status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); nfs_refresh_inode(dir, &dir_attr); if (status >= 0 && !(fattr->valid & NFS_ATTR_FATTR)) { msg.rpc_proc = &nfs3_procedures[NFS3PROC_GETATTR]; msg.rpc_argp = fhandle; msg.rpc_resp = fattr; status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); } dprintk("NFS reply lookup: %d\n", status); return status; } static int nfs3_proc_access(struct inode *inode, struct nfs_access_entry *entry) { struct nfs_fattr fattr; struct nfs3_accessargs arg = { .fh = NFS_FH(inode), }; struct nfs3_accessres res = { .fattr = &fattr, }; struct rpc_message msg = { .rpc_proc = &nfs3_procedures[NFS3PROC_ACCESS], .rpc_argp = &arg, .rpc_resp = &res, .rpc_cred = entry->cred, }; int mode = entry->mask; int status; dprintk("NFS call access\n"); 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; } nfs_fattr_init(&fattr); status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0); nfs_refresh_inode(inode, &fattr); if (status == 0) { entry->mask = 0; if (res.access & NFS3_ACCESS_READ) entry->mask |= MAY_READ; if (res.access & (NFS3_ACCESS_MODIFY | NFS3_ACCESS_EXTEND | NFS3_ACCESS_DELETE)) entry->mask |= MAY_WRITE; if (res.access & (NFS3_ACCESS_LOOKUP|NFS3_ACCESS_EXECUTE)) entry->mask |= MAY_EXEC; } dprintk("NFS reply access: %d\n", status); return status; } static int nfs3_proc_readlink(struct inode *inode, struct page *page, unsigned int pgbase, unsigned int pglen) { struct nfs_fattr fattr; struct nfs3_readlinkargs args = { .fh = NFS_FH(inode), .pgbase = pgbase, .pglen = pglen, .pages = &page }; struct rpc_message msg = { .rpc_proc = &nfs3_procedures[NFS3PROC_READLINK], .rpc_argp = &args, .rpc_resp = &fattr, }; int status; dprintk("NFS call readlink\n"); nfs_fattr_init(&fattr); status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0); nfs_refresh_inode(inode, &fattr); dprintk("NFS reply readlink: %d\n", status); return status; } /* * Create a regular file. * For now, we don't implement O_EXCL. */ static int nfs3_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr, int flags, struct nameidata *nd) { struct nfs_fh fhandle; struct nfs_fattr fattr; struct nfs_fattr dir_attr; struct nfs3_createargs arg = { .fh = NFS_FH(dir), .name = dentry->d_name.name, .len = dentry->d_name.len, .sattr = sattr, }; struct nfs3_diropres res = { .dir_attr = &dir_attr, .fh = &fhandle, .fattr = &fattr }; struct rpc_message msg = { .rpc_proc = &nfs3_procedures[NFS3PROC_CREATE], .rpc_argp = &arg, .rpc_resp = &res, }; mode_t mode = sattr->ia_mode; int status; dprintk("NFS call create %s\n", dentry->d_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; } sattr->ia_mode &= ~current->fs->umask; again: nfs_fattr_init(&dir_attr); nfs_fattr_init(&fattr); status = rpc_call_sync(NFS_CLIENT(dir), &msg, 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 == -ENOTSUPP) { 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 out; } goto again; } if (status == 0) status = nfs_instantiate(dentry, &fhandle, &fattr); if (status != 0) goto out; /* When we created the file with exclusive semantics, make * sure we set the attributes afterwards. */ if (arg.createmode == NFS3_CREATE_EXCLUSIVE) { dprintk("NFS call setattr (post-create)\n"); if (!(sattr->ia_valid & ATTR_ATIME_SET)) sattr->ia_valid |= ATTR_ATIME; if (!(sattr->ia_valid & ATTR_MTIME_SET)) sattr->ia_valid |= ATTR_MTIME; /* 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) */ status = nfs3_proc_setattr(dentry, &fattr, sattr); nfs_post_op_update_inode(dentry->d_inode, &fattr); dprintk("NFS reply setattr (post-create): %d\n", status); } if (status != 0) goto out; status = nfs3_proc_set_default_acl(dir, dentry->d_inode, mode); out: dprintk("NFS reply create: %d\n", status); return status; } static int nfs3_proc_remove(struct inode *dir, struct qstr *name) { struct nfs_removeargs arg = { .fh = NFS_FH(dir), .name.len = name->len, .name.name = name->name, }; struct nfs_removeres res; struct rpc_message msg = { .rpc_proc = &nfs3_procedures[NFS3PROC_REMOVE], .rpc_argp = &arg, .rpc_resp = &res, }; int status; dprintk("NFS call remove %s\n", name->name); nfs_fattr_init(&res.dir_attr); status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); nfs_post_op_update_inode(dir, &res.dir_attr); dprintk("NFS reply remove: %d\n", status); return status; } static void nfs3_proc_unlink_setup(struct rpc_message *msg, struct inode *dir) { msg->rpc_proc = &nfs3_procedures[NFS3PROC_REMOVE]; } static int nfs3_proc_unlink_done(struct rpc_task *task, struct inode *dir) { struct nfs_removeres *res; if (nfs3_async_handle_jukebox(task, dir)) return 0; res = task->tk_msg.rpc_resp; nfs_post_op_update_inode(dir, &res->dir_attr); return 1; } 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 = { .fromfh = NFS_FH(old_dir), .fromname = old_name->name, .fromlen = old_name->len, .tofh = NFS_FH(new_dir), .toname = new_name->name, .tolen = new_name->len }; struct nfs3_renameres res = { .fromattr = &old_dir_attr, .toattr = &new_dir_attr }; struct rpc_message msg = { .rpc_proc = &nfs3_procedures[NFS3PROC_RENAME], .rpc_argp = &arg, .rpc_resp = &res, }; int status; dprintk("NFS call rename %s -> %s\n", old_name->name, new_name->name); nfs_fattr_init(&old_dir_attr); nfs_fattr_init(&new_dir_attr); status = rpc_call_sync(NFS_CLIENT(old_dir), &msg, 0); nfs_post_op_update_inode(old_dir, &old_dir_attr); nfs_post_op_update_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 = { .fromfh = NFS_FH(inode), .tofh = NFS_FH(dir), .toname = name->name, .tolen = name->len }; struct nfs3_linkres res = { .dir_attr = &dir_attr, .fattr = &fattr }; struct rpc_message msg = { .rpc_proc = &nfs3_procedures[NFS3PROC_LINK], .rpc_argp = &arg, .rpc_resp = &res, }; int status; dprintk("NFS call link %s\n", name->name); nfs_fattr_init(&dir_attr); nfs_fattr_init(&fattr); status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0); nfs_post_op_update_inode(dir, &dir_attr); nfs_post_op_update_inode(inode, &fattr); dprintk("NFS reply link: %d\n", status); return status; } static int nfs3_proc_symlink(struct inode *dir, struct dentry *dentry, struct page *page, unsigned int len, struct iattr *sattr) { struct nfs_fh fhandle; struct nfs_fattr fattr, dir_attr; struct nfs3_symlinkargs arg = { .fromfh = NFS_FH(dir), .fromname = dentry->d_name.name, .fromlen = dentry->d_name.len, .pages = &page, .pathlen = len, .sattr = sattr }; struct nfs3_diropres res = { .dir_attr = &dir_attr, .fh = &fhandle, .fattr = &fattr }; struct rpc_message msg = { .rpc_proc = &nfs3_procedures[NFS3PROC_SYMLINK], .rpc_argp = &arg, .rpc_resp = &res, }; int status; if (len > NFS3_MAXPATHLEN) return -ENAMETOOLONG; dprintk("NFS call symlink %s\n", dentry->d_name.name); nfs_fattr_init(&dir_attr); nfs_fattr_init(&fattr); status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); nfs_post_op_update_inode(dir, &dir_attr); if (status != 0) goto out; status = nfs_instantiate(dentry, &fhandle, &fattr); out: dprintk("NFS reply symlink: %d\n", status); return status; } static int nfs3_proc_mkdir(struct inode *dir, struct dentry *dentry, struct iattr *sattr) { struct nfs_fh fhandle; struct nfs_fattr fattr, dir_attr; struct nfs3_mkdirargs arg = { .fh = NFS_FH(dir), .name = dentry->d_name.name, .len = dentry->d_name.len, .sattr = sattr }; struct nfs3_diropres res = { .dir_attr = &dir_attr, .fh = &fhandle, .fattr = &fattr }; struct rpc_message msg = { .rpc_proc = &nfs3_procedures[NFS3PROC_MKDIR], .rpc_argp = &arg, .rpc_resp = &res, }; int mode = sattr->ia_mode; int status; dprintk("NFS call mkdir %s\n", dentry->d_name.name); sattr->ia_mode &= ~current->fs->umask; nfs_fattr_init(&dir_attr); nfs_fattr_init(&fattr); status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); nfs_post_op_update_inode(dir, &dir_attr); if (status != 0) goto out; status = nfs_instantiate(dentry, &fhandle, &fattr); if (status != 0) goto out; status = nfs3_proc_set_default_acl(dir, dentry->d_inode, mode); out: 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 = { .fh = NFS_FH(dir), .name = name->name, .len = name->len }; struct rpc_message msg = { .rpc_proc = &nfs3_procedures[NFS3PROC_RMDIR], .rpc_argp = &arg, .rpc_resp = &dir_attr, }; int status; dprintk("NFS call rmdir %s\n", name->name); nfs_fattr_init(&dir_attr); status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); nfs_post_op_update_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 dentry *dentry, struct rpc_cred *cred, u64 cookie, struct page *page, unsigned int count, int plus) { struct inode *dir = dentry->d_inode; struct nfs_fattr dir_attr; __be32 *verf = NFS_COOKIEVERF(dir); struct nfs3_readdirargs arg = { .fh = NFS_FH(dir), .cookie = cookie, .verf = {verf[0], verf[1]}, .plus = plus, .count = count, .pages = &page }; struct nfs3_readdirres res = { .dir_attr = &dir_attr, .verf = verf, .plus = plus }; struct rpc_message msg = { .rpc_proc = &nfs3_procedures[NFS3PROC_READDIR], .rpc_argp = &arg, .rpc_resp = &res, .rpc_cred = cred }; int status; if (plus) msg.rpc_proc = &nfs3_procedures[NFS3PROC_READDIRPLUS]; dprintk("NFS call readdir%s %d\n", plus? "plus" : "", (unsigned int) cookie); nfs_fattr_init(&dir_attr); status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); nfs_invalidate_atime(dir); nfs_refresh_inode(dir, &dir_attr); dprintk("NFS reply readdir: %d\n", status); return status; } static int nfs3_proc_mknod(struct inode *dir, struct dentry *dentry, struct iattr *sattr, dev_t rdev) { struct nfs_fh fh; struct nfs_fattr fattr, dir_attr; struct nfs3_mknodargs arg = { .fh = NFS_FH(dir), .name = dentry->d_name.name, .len = dentry->d_name.len, .sattr = sattr, .rdev = rdev }; struct nfs3_diropres res = { .dir_attr = &dir_attr, .fh = &fh, .fattr = &fattr }; struct rpc_message msg = { .rpc_proc = &nfs3_procedures[NFS3PROC_MKNOD], .rpc_argp = &arg, .rpc_resp = &res, }; mode_t mode = sattr->ia_mode; 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 %u:%u\n", dentry->d_name.name, MAJOR(rdev), MINOR(rdev)); sattr->ia_mode &= ~current->fs->umask; nfs_fattr_init(&dir_attr); nfs_fattr_init(&fattr); status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); nfs_post_op_update_inode(dir, &dir_attr); if (status != 0) goto out; status = nfs_instantiate(dentry, &fh, &fattr); if (status != 0) goto out; status = nfs3_proc_set_default_acl(dir, dentry->d_inode, mode); out: dprintk("NFS reply mknod: %d\n", status); return status; } static int nfs3_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *stat) { struct rpc_message msg = { .rpc_proc = &nfs3_procedures[NFS3PROC_FSSTAT], .rpc_argp = fhandle, .rpc_resp = stat, }; int status; dprintk("NFS call fsstat\n"); nfs_fattr_init(stat->fattr); status = rpc_call_sync(server->client, &msg, 0); dprintk("NFS reply statfs: %d\n", status); return status; } static int nfs3_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *info) { struct rpc_message msg = { .rpc_proc = &nfs3_procedures[NFS3PROC_FSINFO], .rpc_argp = fhandle, .rpc_resp = info, }; int status; dprintk("NFS call fsinfo\n"); nfs_fattr_init(info->fattr); status = rpc_call_sync(server->nfs_client->cl_rpcclient, &msg, 0); dprintk("NFS reply fsinfo: %d\n", status); return status; } static int nfs3_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_pathconf *info) { struct rpc_message msg = { .rpc_proc = &nfs3_procedures[NFS3PROC_PATHCONF], .rpc_argp = fhandle, .rpc_resp = info, }; int status; dprintk("NFS call pathconf\n"); nfs_fattr_init(info->fattr); status = rpc_call_sync(server->client, &msg, 0); dprintk("NFS reply pathconf: %d\n", status); return status; } static int nfs3_read_done(struct rpc_task *task, struct nfs_read_data *data) { if (nfs3_async_handle_jukebox(task, data->inode)) return -EAGAIN; nfs_invalidate_atime(data->inode); nfs_refresh_inode(data->inode, &data->fattr); return 0; } static void nfs3_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg) { msg->rpc_proc = &nfs3_procedures[NFS3PROC_READ]; } static int nfs3_write_done(struct rpc_task *task, struct nfs_write_data *data) { if (nfs3_async_handle_jukebox(task, data->inode)) return -EAGAIN; if (task->tk_status >= 0) nfs_post_op_update_inode_force_wcc(data->inode, data->res.fattr); return 0; } static void nfs3_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg) { msg->rpc_proc = &nfs3_procedures[NFS3PROC_WRITE]; } static int nfs3_commit_done(struct rpc_task *task, struct nfs_write_data *data) { if (nfs3_async_handle_jukebox(task, data->inode)) return -EAGAIN; nfs_refresh_inode(data->inode, data->res.fattr); return 0; } static void nfs3_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg) { msg->rpc_proc = &nfs3_procedures[NFS3PROC_COMMIT]; } static int nfs3_proc_lock(struct file *filp, int cmd, struct file_lock *fl) { struct inode *inode = filp->f_path.dentry->d_inode; return nlmclnt_proc(NFS_SERVER(inode)->nlm_host, cmd, fl); } const struct nfs_rpc_ops nfs_v3_clientops = { .version = 3, /* protocol version */ .dentry_ops = &nfs_dentry_operations, .dir_inode_ops = &nfs3_dir_inode_operations, .file_inode_ops = &nfs3_file_inode_operations, .getroot = nfs3_proc_get_root, .getattr = nfs3_proc_getattr, .setattr = nfs3_proc_setattr, .lookup = nfs3_proc_lookup, .access = nfs3_proc_access, .readlink = nfs3_proc_readlink, .create = nfs3_proc_create, .remove = nfs3_proc_remove, .unlink_setup = nfs3_proc_unlink_setup, .unlink_done = nfs3_proc_unlink_done, .rename = nfs3_proc_rename, .link = nfs3_proc_link, .symlink = nfs3_proc_symlink, .mkdir = nfs3_proc_mkdir, .rmdir = nfs3_proc_rmdir, .readdir = nfs3_proc_readdir, .mknod = nfs3_proc_mknod, .statfs = nfs3_proc_statfs, .fsinfo = nfs3_proc_fsinfo, .pathconf = nfs3_proc_pathconf, .decode_dirent = nfs3_decode_dirent, .read_setup = nfs3_proc_read_setup, .read_done = nfs3_read_done, .write_setup = nfs3_proc_write_setup, .write_done = nfs3_write_done, .commit_setup = nfs3_proc_commit_setup, .commit_done = nfs3_commit_done, .file_open = nfs_open, .file_release = nfs_release, .lock = nfs3_proc_lock, .clear_acl_cache = nfs3_forget_cached_acls, };