// SPDX-License-Identifier: GPL-2.0 /* * linux/fs/nfs/proc.c * * Copyright (C) 1992, 1993, 1994 Rick Sladkey * * OS-independent nfs remote procedure call functions * * Tuned by Alan Cox <A.Cox@swansea.ac.uk> for >3K buffers * so at last we can have decent(ish) throughput off a * Sun server. * * Coding optimized and cleaned up by Florian La Roche. * Note: Error returns are optimized for NFS_OK, which isn't translated via * nfs_stat_to_errno(), but happens to be already the right return code. * * Also, the code currently doesn't check the size of the packet, when * it decodes the packet. * * Feel free to fix it and mail me the diffs if it worries you. * * Completely rewritten to support the new RPC call interface; * rewrote and moved the entire XDR stuff to xdr.c * --Olaf Kirch June 1996 * * The code below initializes all auto variables explicitly, otherwise * it will fail to work as a module (gcc generates a memset call for an * incomplete struct). */ #include <linux/types.h> #include <linux/param.h> #include <linux/time.h> #include <linux/mm.h> #include <linux/errno.h> #include <linux/string.h> #include <linux/in.h> #include <linux/pagemap.h> #include <linux/sunrpc/clnt.h> #include <linux/nfs.h> #include <linux/nfs2.h> #include <linux/nfs_fs.h> #include <linux/nfs_page.h> #include <linux/lockd/bind.h> #include <linux/freezer.h> #include "internal.h" #define NFSDBG_FACILITY NFSDBG_PROC /* * Bare-bones access to getattr: this is for nfs_read_super. */ static int nfs_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *info) { struct nfs_fattr *fattr = info->fattr; struct nfs2_fsstat fsinfo; struct rpc_message msg = { .rpc_proc = &nfs_procedures[NFSPROC_GETATTR], .rpc_argp = fhandle, .rpc_resp = fattr, }; int status; dprintk("%s: call getattr\n", __func__); nfs_fattr_init(fattr); status = rpc_call_sync(server->client, &msg, 0); /* Retry with default authentication if different */ if (status && server->nfs_client->cl_rpcclient != server->client) status = rpc_call_sync(server->nfs_client->cl_rpcclient, &msg, 0); dprintk("%s: reply getattr: %d\n", __func__, status); if (status) return status; dprintk("%s: call statfs\n", __func__); msg.rpc_proc = &nfs_procedures[NFSPROC_STATFS]; msg.rpc_resp = &fsinfo; status = rpc_call_sync(server->client, &msg, 0); /* Retry with default authentication if different */ if (status && server->nfs_client->cl_rpcclient != server->client) status = rpc_call_sync(server->nfs_client->cl_rpcclient, &msg, 0); dprintk("%s: reply statfs: %d\n", __func__, status); if (status) return status; info->rtmax = NFS_MAXDATA; info->rtpref = fsinfo.tsize; info->rtmult = fsinfo.bsize; info->wtmax = NFS_MAXDATA; info->wtpref = fsinfo.tsize; info->wtmult = fsinfo.bsize; info->dtpref = fsinfo.tsize; info->maxfilesize = 0x7FFFFFFF; info->lease_time = 0; return 0; } /* * One function for each procedure in the NFS protocol. */ static int nfs_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr, struct nfs4_label *label, struct inode *inode) { struct rpc_message msg = { .rpc_proc = &nfs_procedures[NFSPROC_GETATTR], .rpc_argp = fhandle, .rpc_resp = fattr, }; int status; unsigned short task_flags = 0; /* Is this is an attribute revalidation, subject to softreval? */ if (inode && (server->flags & NFS_MOUNT_SOFTREVAL)) task_flags |= RPC_TASK_TIMEOUT; dprintk("NFS call getattr\n"); nfs_fattr_init(fattr); status = rpc_call_sync(server->client, &msg, task_flags); dprintk("NFS reply getattr: %d\n", status); return status; } static int nfs_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr, struct iattr *sattr) { struct inode *inode = d_inode(dentry); struct nfs_sattrargs arg = { .fh = NFS_FH(inode), .sattr = sattr }; struct rpc_message msg = { .rpc_proc = &nfs_procedures[NFSPROC_SETATTR], .rpc_argp = &arg, .rpc_resp = fattr, }; int status; /* Mask out the non-modebit related stuff from attr->ia_mode */ sattr->ia_mode &= S_IALLUGO; dprintk("NFS call setattr\n"); if (sattr->ia_valid & ATTR_FILE) msg.rpc_cred = nfs_file_cred(sattr->ia_file); nfs_fattr_init(fattr); status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0); if (status == 0) nfs_setattr_update_inode(inode, sattr, fattr); dprintk("NFS reply setattr: %d\n", status); return status; } static int nfs_proc_lookup(struct inode *dir, struct dentry *dentry, struct nfs_fh *fhandle, struct nfs_fattr *fattr, struct nfs4_label *label) { struct nfs_diropargs arg = { .fh = NFS_FH(dir), .name = dentry->d_name.name, .len = dentry->d_name.len }; struct nfs_diropok res = { .fh = fhandle, .fattr = fattr }; struct rpc_message msg = { .rpc_proc = &nfs_procedures[NFSPROC_LOOKUP], .rpc_argp = &arg, .rpc_resp = &res, }; int status; unsigned short task_flags = 0; /* Is this is an attribute revalidation, subject to softreval? */ if (nfs_lookup_is_soft_revalidate(dentry)) task_flags |= RPC_TASK_TIMEOUT; dprintk("NFS call lookup %pd2\n", dentry); nfs_fattr_init(fattr); status = rpc_call_sync(NFS_CLIENT(dir), &msg, task_flags); dprintk("NFS reply lookup: %d\n", status); return status; } static int nfs_proc_readlink(struct inode *inode, struct page *page, unsigned int pgbase, unsigned int pglen) { struct nfs_readlinkargs args = { .fh = NFS_FH(inode), .pgbase = pgbase, .pglen = pglen, .pages = &page }; struct rpc_message msg = { .rpc_proc = &nfs_procedures[NFSPROC_READLINK], .rpc_argp = &args, }; int status; dprintk("NFS call readlink\n"); status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0); dprintk("NFS reply readlink: %d\n", status); return status; } struct nfs_createdata { struct nfs_createargs arg; struct nfs_diropok res; struct nfs_fh fhandle; struct nfs_fattr fattr; }; static struct nfs_createdata *nfs_alloc_createdata(struct inode *dir, struct dentry *dentry, struct iattr *sattr) { struct nfs_createdata *data; data = kmalloc(sizeof(*data), GFP_KERNEL); if (data != NULL) { data->arg.fh = NFS_FH(dir); data->arg.name = dentry->d_name.name; data->arg.len = dentry->d_name.len; data->arg.sattr = sattr; nfs_fattr_init(&data->fattr); data->fhandle.size = 0; data->res.fh = &data->fhandle; data->res.fattr = &data->fattr; } return data; }; static void nfs_free_createdata(const struct nfs_createdata *data) { kfree(data); } static int nfs_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr, int flags) { struct nfs_createdata *data; struct rpc_message msg = { .rpc_proc = &nfs_procedures[NFSPROC_CREATE], }; int status = -ENOMEM; dprintk("NFS call create %pd\n", dentry); data = nfs_alloc_createdata(dir, dentry, sattr); if (data == NULL) goto out; msg.rpc_argp = &data->arg; msg.rpc_resp = &data->res; status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); nfs_mark_for_revalidate(dir); if (status == 0) status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, NULL); nfs_free_createdata(data); out: dprintk("NFS reply create: %d\n", status); return status; } /* * In NFSv2, mknod is grafted onto the create call. */ static int nfs_proc_mknod(struct inode *dir, struct dentry *dentry, struct iattr *sattr, dev_t rdev) { struct nfs_createdata *data; struct rpc_message msg = { .rpc_proc = &nfs_procedures[NFSPROC_CREATE], }; umode_t mode; int status = -ENOMEM; dprintk("NFS call mknod %pd\n", dentry); mode = sattr->ia_mode; if (S_ISFIFO(mode)) { sattr->ia_mode = (mode & ~S_IFMT) | S_IFCHR; sattr->ia_valid &= ~ATTR_SIZE; } else if (S_ISCHR(mode) || S_ISBLK(mode)) { sattr->ia_valid |= ATTR_SIZE; sattr->ia_size = new_encode_dev(rdev);/* get out your barf bag */ } data = nfs_alloc_createdata(dir, dentry, sattr); if (data == NULL) goto out; msg.rpc_argp = &data->arg; msg.rpc_resp = &data->res; status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); nfs_mark_for_revalidate(dir); if (status == -EINVAL && S_ISFIFO(mode)) { sattr->ia_mode = mode; nfs_fattr_init(data->res.fattr); status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); } if (status == 0) status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, NULL); nfs_free_createdata(data); out: dprintk("NFS reply mknod: %d\n", status); return status; } static int nfs_proc_remove(struct inode *dir, struct dentry *dentry) { struct nfs_removeargs arg = { .fh = NFS_FH(dir), .name = dentry->d_name, }; struct rpc_message msg = { .rpc_proc = &nfs_procedures[NFSPROC_REMOVE], .rpc_argp = &arg, }; int status; dprintk("NFS call remove %pd2\n",dentry); status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); nfs_mark_for_revalidate(dir); dprintk("NFS reply remove: %d\n", status); return status; } static void nfs_proc_unlink_setup(struct rpc_message *msg, struct dentry *dentry, struct inode *inode) { msg->rpc_proc = &nfs_procedures[NFSPROC_REMOVE]; } static void nfs_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data) { rpc_call_start(task); } static int nfs_proc_unlink_done(struct rpc_task *task, struct inode *dir) { nfs_mark_for_revalidate(dir); return 1; } static void nfs_proc_rename_setup(struct rpc_message *msg, struct dentry *old_dentry, struct dentry *new_dentry) { msg->rpc_proc = &nfs_procedures[NFSPROC_RENAME]; } static void nfs_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data) { rpc_call_start(task); } static int nfs_proc_rename_done(struct rpc_task *task, struct inode *old_dir, struct inode *new_dir) { nfs_mark_for_revalidate(old_dir); nfs_mark_for_revalidate(new_dir); return 1; } static int nfs_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name) { struct nfs_linkargs arg = { .fromfh = NFS_FH(inode), .tofh = NFS_FH(dir), .toname = name->name, .tolen = name->len }; struct rpc_message msg = { .rpc_proc = &nfs_procedures[NFSPROC_LINK], .rpc_argp = &arg, }; int status; dprintk("NFS call link %s\n", name->name); status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0); nfs_mark_for_revalidate(inode); nfs_mark_for_revalidate(dir); dprintk("NFS reply link: %d\n", status); return status; } static int nfs_proc_symlink(struct inode *dir, struct dentry *dentry, struct page *page, unsigned int len, struct iattr *sattr) { struct nfs_fh *fh; struct nfs_fattr *fattr; struct nfs_symlinkargs arg = { .fromfh = NFS_FH(dir), .fromname = dentry->d_name.name, .fromlen = dentry->d_name.len, .pages = &page, .pathlen = len, .sattr = sattr }; struct rpc_message msg = { .rpc_proc = &nfs_procedures[NFSPROC_SYMLINK], .rpc_argp = &arg, }; int status = -ENAMETOOLONG; dprintk("NFS call symlink %pd\n", dentry); if (len > NFS2_MAXPATHLEN) goto out; fh = nfs_alloc_fhandle(); fattr = nfs_alloc_fattr(); status = -ENOMEM; if (fh == NULL || fattr == NULL) goto out_free; status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); nfs_mark_for_revalidate(dir); /* * V2 SYMLINK requests don't return any attributes. Setting the * filehandle size to zero indicates to nfs_instantiate that it * should fill in the data with a LOOKUP call on the wire. */ if (status == 0) status = nfs_instantiate(dentry, fh, fattr, NULL); out_free: nfs_free_fattr(fattr); nfs_free_fhandle(fh); out: dprintk("NFS reply symlink: %d\n", status); return status; } static int nfs_proc_mkdir(struct inode *dir, struct dentry *dentry, struct iattr *sattr) { struct nfs_createdata *data; struct rpc_message msg = { .rpc_proc = &nfs_procedures[NFSPROC_MKDIR], }; int status = -ENOMEM; dprintk("NFS call mkdir %pd\n", dentry); data = nfs_alloc_createdata(dir, dentry, sattr); if (data == NULL) goto out; msg.rpc_argp = &data->arg; msg.rpc_resp = &data->res; status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); nfs_mark_for_revalidate(dir); if (status == 0) status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, NULL); nfs_free_createdata(data); out: dprintk("NFS reply mkdir: %d\n", status); return status; } static int nfs_proc_rmdir(struct inode *dir, const struct qstr *name) { struct nfs_diropargs arg = { .fh = NFS_FH(dir), .name = name->name, .len = name->len }; struct rpc_message msg = { .rpc_proc = &nfs_procedures[NFSPROC_RMDIR], .rpc_argp = &arg, }; int status; dprintk("NFS call rmdir %s\n", name->name); status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); nfs_mark_for_revalidate(dir); dprintk("NFS reply rmdir: %d\n", status); return status; } /* * The READDIR implementation is somewhat hackish - we pass a temporary * buffer to the encode function, which installs it in the receive * the receive iovec. The decode function just parses the reply to make * sure it is syntactically correct; the entries itself are decoded * from nfs_readdir by calling the decode_entry function directly. */ static int nfs_proc_readdir(struct nfs_readdir_arg *nr_arg, struct nfs_readdir_res *nr_res) { struct inode *dir = d_inode(nr_arg->dentry); struct nfs_readdirargs arg = { .fh = NFS_FH(dir), .cookie = nr_arg->cookie, .count = nr_arg->page_len, .pages = nr_arg->pages, }; struct rpc_message msg = { .rpc_proc = &nfs_procedures[NFSPROC_READDIR], .rpc_argp = &arg, .rpc_cred = nr_arg->cred, }; int status; dprintk("NFS call readdir %llu\n", (unsigned long long)nr_arg->cookie); status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); nr_res->verf[0] = nr_res->verf[1] = 0; nfs_invalidate_atime(dir); dprintk("NFS reply readdir: %d\n", status); return status; } static int nfs_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *stat) { struct nfs2_fsstat fsinfo; struct rpc_message msg = { .rpc_proc = &nfs_procedures[NFSPROC_STATFS], .rpc_argp = fhandle, .rpc_resp = &fsinfo, }; int status; dprintk("NFS call statfs\n"); nfs_fattr_init(stat->fattr); status = rpc_call_sync(server->client, &msg, 0); dprintk("NFS reply statfs: %d\n", status); if (status) goto out; stat->tbytes = (u64)fsinfo.blocks * fsinfo.bsize; stat->fbytes = (u64)fsinfo.bfree * fsinfo.bsize; stat->abytes = (u64)fsinfo.bavail * fsinfo.bsize; stat->tfiles = 0; stat->ffiles = 0; stat->afiles = 0; out: return status; } static int nfs_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *info) { struct nfs2_fsstat fsinfo; struct rpc_message msg = { .rpc_proc = &nfs_procedures[NFSPROC_STATFS], .rpc_argp = fhandle, .rpc_resp = &fsinfo, }; int status; dprintk("NFS call fsinfo\n"); nfs_fattr_init(info->fattr); status = rpc_call_sync(server->client, &msg, 0); dprintk("NFS reply fsinfo: %d\n", status); if (status) goto out; info->rtmax = NFS_MAXDATA; info->rtpref = fsinfo.tsize; info->rtmult = fsinfo.bsize; info->wtmax = NFS_MAXDATA; info->wtpref = fsinfo.tsize; info->wtmult = fsinfo.bsize; info->dtpref = fsinfo.tsize; info->maxfilesize = 0x7FFFFFFF; info->lease_time = 0; out: return status; } static int nfs_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_pathconf *info) { info->max_link = 0; info->max_namelen = NFS2_MAXNAMLEN; return 0; } static int nfs_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr) { struct inode *inode = hdr->inode; nfs_invalidate_atime(inode); if (task->tk_status >= 0) { nfs_refresh_inode(inode, hdr->res.fattr); /* Emulate the eof flag, which isn't normally needed in NFSv2 * as it is guaranteed to always return the file attributes */ if ((hdr->res.count == 0 && hdr->args.count > 0) || hdr->args.offset + hdr->res.count >= hdr->res.fattr->size) hdr->res.eof = 1; } return 0; } static void nfs_proc_read_setup(struct nfs_pgio_header *hdr, struct rpc_message *msg) { msg->rpc_proc = &nfs_procedures[NFSPROC_READ]; } static int nfs_proc_pgio_rpc_prepare(struct rpc_task *task, struct nfs_pgio_header *hdr) { rpc_call_start(task); return 0; } static int nfs_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr) { if (task->tk_status >= 0) { hdr->res.count = hdr->args.count; nfs_writeback_update_inode(hdr); } return 0; } static void nfs_proc_write_setup(struct nfs_pgio_header *hdr, struct rpc_message *msg, struct rpc_clnt **clnt) { /* Note: NFSv2 ignores @stable and always uses NFS_FILE_SYNC */ hdr->args.stable = NFS_FILE_SYNC; msg->rpc_proc = &nfs_procedures[NFSPROC_WRITE]; } static void nfs_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data) { BUG(); } static void nfs_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg, struct rpc_clnt **clnt) { BUG(); } static int nfs_proc_lock(struct file *filp, int cmd, struct file_lock *fl) { struct inode *inode = file_inode(filp); return nlmclnt_proc(NFS_SERVER(inode)->nlm_host, cmd, fl, NULL); } /* Helper functions for NFS lock bounds checking */ #define NFS_LOCK32_OFFSET_MAX ((__s32)0x7fffffffUL) static int nfs_lock_check_bounds(const struct file_lock *fl) { __s32 start, end; start = (__s32)fl->fl_start; if ((loff_t)start != fl->fl_start) goto out_einval; if (fl->fl_end != OFFSET_MAX) { end = (__s32)fl->fl_end; if ((loff_t)end != fl->fl_end) goto out_einval; } else end = NFS_LOCK32_OFFSET_MAX; if (start < 0 || start > end) goto out_einval; return 0; out_einval: return -EINVAL; } static int nfs_have_delegation(struct inode *inode, fmode_t flags) { return 0; } static const struct inode_operations nfs_dir_inode_operations = { .create = nfs_create, .lookup = nfs_lookup, .link = nfs_link, .unlink = nfs_unlink, .symlink = nfs_symlink, .mkdir = nfs_mkdir, .rmdir = nfs_rmdir, .mknod = nfs_mknod, .rename = nfs_rename, .permission = nfs_permission, .getattr = nfs_getattr, .setattr = nfs_setattr, }; static const struct inode_operations nfs_file_inode_operations = { .permission = nfs_permission, .getattr = nfs_getattr, .setattr = nfs_setattr, }; const struct nfs_rpc_ops nfs_v2_clientops = { .version = 2, /* protocol version */ .dentry_ops = &nfs_dentry_operations, .dir_inode_ops = &nfs_dir_inode_operations, .file_inode_ops = &nfs_file_inode_operations, .file_ops = &nfs_file_operations, .getroot = nfs_proc_get_root, .submount = nfs_submount, .try_get_tree = nfs_try_get_tree, .getattr = nfs_proc_getattr, .setattr = nfs_proc_setattr, .lookup = nfs_proc_lookup, .access = NULL, /* access */ .readlink = nfs_proc_readlink, .create = nfs_proc_create, .remove = nfs_proc_remove, .unlink_setup = nfs_proc_unlink_setup, .unlink_rpc_prepare = nfs_proc_unlink_rpc_prepare, .unlink_done = nfs_proc_unlink_done, .rename_setup = nfs_proc_rename_setup, .rename_rpc_prepare = nfs_proc_rename_rpc_prepare, .rename_done = nfs_proc_rename_done, .link = nfs_proc_link, .symlink = nfs_proc_symlink, .mkdir = nfs_proc_mkdir, .rmdir = nfs_proc_rmdir, .readdir = nfs_proc_readdir, .mknod = nfs_proc_mknod, .statfs = nfs_proc_statfs, .fsinfo = nfs_proc_fsinfo, .pathconf = nfs_proc_pathconf, .decode_dirent = nfs2_decode_dirent, .pgio_rpc_prepare = nfs_proc_pgio_rpc_prepare, .read_setup = nfs_proc_read_setup, .read_done = nfs_read_done, .write_setup = nfs_proc_write_setup, .write_done = nfs_write_done, .commit_setup = nfs_proc_commit_setup, .commit_rpc_prepare = nfs_proc_commit_rpc_prepare, .lock = nfs_proc_lock, .lock_check_bounds = nfs_lock_check_bounds, .close_context = nfs_close_context, .have_delegation = nfs_have_delegation, .alloc_client = nfs_alloc_client, .init_client = nfs_init_client, .free_client = nfs_free_client, .create_server = nfs_create_server, .clone_server = nfs_clone_server, };