diff options
Diffstat (limited to 'fs/nfs/proc.c')
| -rw-r--r-- | fs/nfs/proc.c | 655 |
1 files changed, 655 insertions, 0 deletions
diff --git a/fs/nfs/proc.c b/fs/nfs/proc.c new file mode 100644 index 000000000000..d31b4d6e5a5e --- /dev/null +++ b/fs/nfs/proc.c @@ -0,0 +1,655 @@ +/* + * 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/slab.h> +#include <linux/time.h> +#include <linux/mm.h> +#include <linux/utsname.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/smp_lock.h> + +#define NFSDBG_FACILITY NFSDBG_PROC + +extern struct rpc_procinfo nfs_procedures[]; + +/* + * 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; + int status; + + dprintk("%s: call getattr\n", __FUNCTION__); + fattr->valid = 0; + status = rpc_call(server->client_sys, NFSPROC_GETATTR, fhandle, fattr, 0); + dprintk("%s: reply getattr: %d\n", __FUNCTION__, status); + if (status) + return status; + dprintk("%s: call statfs\n", __FUNCTION__); + status = rpc_call(server->client_sys, NFSPROC_STATFS, fhandle, &fsinfo, 0); + dprintk("%s: reply statfs: %d\n", __FUNCTION__, 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) +{ + int status; + + dprintk("NFS call getattr\n"); + fattr->valid = 0; + status = rpc_call(server->client, NFSPROC_GETATTR, + fhandle, fattr, 0); + 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 = dentry->d_inode; + struct nfs_sattrargs arg = { + .fh = NFS_FH(inode), + .sattr = sattr + }; + int status; + + dprintk("NFS call setattr\n"); + fattr->valid = 0; + status = rpc_call(NFS_CLIENT(inode), NFSPROC_SETATTR, &arg, fattr, 0); + dprintk("NFS reply setattr: %d\n", status); + return status; +} + +static int +nfs_proc_lookup(struct inode *dir, struct qstr *name, + struct nfs_fh *fhandle, struct nfs_fattr *fattr) +{ + struct nfs_diropargs arg = { + .fh = NFS_FH(dir), + .name = name->name, + .len = name->len + }; + struct nfs_diropok res = { + .fh = fhandle, + .fattr = fattr + }; + int status; + + dprintk("NFS call lookup %s\n", name->name); + fattr->valid = 0; + status = rpc_call(NFS_CLIENT(dir), NFSPROC_LOOKUP, &arg, &res, 0); + 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 + }; + int status; + + dprintk("NFS call readlink\n"); + status = rpc_call(NFS_CLIENT(inode), NFSPROC_READLINK, &args, NULL, 0); + dprintk("NFS reply readlink: %d\n", status); + return status; +} + +static int nfs_proc_read(struct nfs_read_data *rdata) +{ + int flags = rdata->flags; + struct inode * inode = rdata->inode; + struct nfs_fattr * fattr = rdata->res.fattr; + struct rpc_message msg = { + .rpc_proc = &nfs_procedures[NFSPROC_READ], + .rpc_argp = &rdata->args, + .rpc_resp = &rdata->res, + .rpc_cred = rdata->cred, + }; + int status; + + dprintk("NFS call read %d @ %Ld\n", rdata->args.count, + (long long) rdata->args.offset); + fattr->valid = 0; + status = rpc_call_sync(NFS_CLIENT(inode), &msg, flags); + if (status >= 0) { + nfs_refresh_inode(inode, fattr); + /* Emulate the eof flag, which isn't normally needed in NFSv2 + * as it is guaranteed to always return the file attributes + */ + if (rdata->args.offset + rdata->args.count >= fattr->size) + rdata->res.eof = 1; + } + dprintk("NFS reply read: %d\n", status); + return status; +} + +static int nfs_proc_write(struct nfs_write_data *wdata) +{ + int flags = wdata->flags; + struct inode * inode = wdata->inode; + struct nfs_fattr * fattr = wdata->res.fattr; + struct rpc_message msg = { + .rpc_proc = &nfs_procedures[NFSPROC_WRITE], + .rpc_argp = &wdata->args, + .rpc_resp = &wdata->res, + .rpc_cred = wdata->cred, + }; + int status; + + dprintk("NFS call write %d @ %Ld\n", wdata->args.count, + (long long) wdata->args.offset); + fattr->valid = 0; + status = rpc_call_sync(NFS_CLIENT(inode), &msg, flags); + if (status >= 0) { + nfs_refresh_inode(inode, fattr); + wdata->res.count = wdata->args.count; + wdata->verf.committed = NFS_FILE_SYNC; + } + dprintk("NFS reply write: %d\n", status); + return status < 0? status : wdata->res.count; +} + +static int +nfs_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr, + int flags) +{ + struct nfs_fh fhandle; + struct nfs_fattr fattr; + struct nfs_createargs arg = { + .fh = NFS_FH(dir), + .name = dentry->d_name.name, + .len = dentry->d_name.len, + .sattr = sattr + }; + struct nfs_diropok res = { + .fh = &fhandle, + .fattr = &fattr + }; + int status; + + fattr.valid = 0; + dprintk("NFS call create %s\n", dentry->d_name.name); + status = rpc_call(NFS_CLIENT(dir), NFSPROC_CREATE, &arg, &res, 0); + if (status == 0) + status = nfs_instantiate(dentry, &fhandle, &fattr); + 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_fh fhandle; + struct nfs_fattr fattr; + struct nfs_createargs arg = { + .fh = NFS_FH(dir), + .name = dentry->d_name.name, + .len = dentry->d_name.len, + .sattr = sattr + }; + struct nfs_diropok res = { + .fh = &fhandle, + .fattr = &fattr + }; + int status, mode; + + dprintk("NFS call mknod %s\n", dentry->d_name.name); + + 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 */ + } + + fattr.valid = 0; + status = rpc_call(NFS_CLIENT(dir), NFSPROC_CREATE, &arg, &res, 0); + + if (status == -EINVAL && S_ISFIFO(mode)) { + sattr->ia_mode = mode; + fattr.valid = 0; + status = rpc_call(NFS_CLIENT(dir), NFSPROC_CREATE, &arg, &res, 0); + } + if (status == 0) + status = nfs_instantiate(dentry, &fhandle, &fattr); + dprintk("NFS reply mknod: %d\n", status); + return status; +} + +static int +nfs_proc_remove(struct inode *dir, 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_REMOVE], + .rpc_argp = &arg, + .rpc_resp = NULL, + .rpc_cred = NULL + }; + int status; + + dprintk("NFS call remove %s\n", name->name); + status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); + + dprintk("NFS reply remove: %d\n", status); + return status; +} + +static int +nfs_proc_unlink_setup(struct rpc_message *msg, struct dentry *dir, struct qstr *name) +{ + struct nfs_diropargs *arg; + + arg = (struct nfs_diropargs *)kmalloc(sizeof(*arg), GFP_KERNEL); + if (!arg) + return -ENOMEM; + arg->fh = NFS_FH(dir->d_inode); + arg->name = name->name; + arg->len = name->len; + msg->rpc_proc = &nfs_procedures[NFSPROC_REMOVE]; + msg->rpc_argp = arg; + return 0; +} + +static int +nfs_proc_unlink_done(struct dentry *dir, struct rpc_task *task) +{ + struct rpc_message *msg = &task->tk_msg; + + if (msg->rpc_argp) + kfree(msg->rpc_argp); + return 0; +} + +static int +nfs_proc_rename(struct inode *old_dir, struct qstr *old_name, + struct inode *new_dir, struct qstr *new_name) +{ + struct nfs_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 + }; + int status; + + dprintk("NFS call rename %s -> %s\n", old_name->name, new_name->name); + status = rpc_call(NFS_CLIENT(old_dir), NFSPROC_RENAME, &arg, NULL, 0); + dprintk("NFS reply rename: %d\n", status); + return status; +} + +static int +nfs_proc_link(struct inode *inode, struct inode *dir, struct qstr *name) +{ + struct nfs_linkargs arg = { + .fromfh = NFS_FH(inode), + .tofh = NFS_FH(dir), + .toname = name->name, + .tolen = name->len + }; + int status; + + dprintk("NFS call link %s\n", name->name); + status = rpc_call(NFS_CLIENT(inode), NFSPROC_LINK, &arg, NULL, 0); + dprintk("NFS reply link: %d\n", status); + return status; +} + +static int +nfs_proc_symlink(struct inode *dir, struct qstr *name, struct qstr *path, + struct iattr *sattr, struct nfs_fh *fhandle, + struct nfs_fattr *fattr) +{ + struct nfs_symlinkargs arg = { + .fromfh = NFS_FH(dir), + .fromname = name->name, + .fromlen = name->len, + .topath = path->name, + .tolen = path->len, + .sattr = sattr + }; + int status; + + if (path->len > NFS2_MAXPATHLEN) + return -ENAMETOOLONG; + dprintk("NFS call symlink %s -> %s\n", name->name, path->name); + fattr->valid = 0; + fhandle->size = 0; + status = rpc_call(NFS_CLIENT(dir), NFSPROC_SYMLINK, &arg, NULL, 0); + 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_fh fhandle; + struct nfs_fattr fattr; + struct nfs_createargs arg = { + .fh = NFS_FH(dir), + .name = dentry->d_name.name, + .len = dentry->d_name.len, + .sattr = sattr + }; + struct nfs_diropok res = { + .fh = &fhandle, + .fattr = &fattr + }; + int status; + + dprintk("NFS call mkdir %s\n", dentry->d_name.name); + fattr.valid = 0; + status = rpc_call(NFS_CLIENT(dir), NFSPROC_MKDIR, &arg, &res, 0); + if (status == 0) + status = nfs_instantiate(dentry, &fhandle, &fattr); + dprintk("NFS reply mkdir: %d\n", status); + return status; +} + +static int +nfs_proc_rmdir(struct inode *dir, struct qstr *name) +{ + struct nfs_diropargs arg = { + .fh = NFS_FH(dir), + .name = name->name, + .len = name->len + }; + int status; + + dprintk("NFS call rmdir %s\n", name->name); + status = rpc_call(NFS_CLIENT(dir), NFSPROC_RMDIR, &arg, NULL, 0); + 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 dentry *dentry, struct rpc_cred *cred, + u64 cookie, struct page *page, unsigned int count, int plus) +{ + struct inode *dir = dentry->d_inode; + struct nfs_readdirargs arg = { + .fh = NFS_FH(dir), + .cookie = cookie, + .count = count, + .pages = &page + }; + struct rpc_message msg = { + .rpc_proc = &nfs_procedures[NFSPROC_READDIR], + .rpc_argp = &arg, + .rpc_resp = NULL, + .rpc_cred = cred + }; + int status; + + lock_kernel(); + + dprintk("NFS call readdir %d\n", (unsigned int)cookie); + status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); + + dprintk("NFS reply readdir: %d\n", status); + unlock_kernel(); + return status; +} + +static int +nfs_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, + struct nfs_fsstat *stat) +{ + struct nfs2_fsstat fsinfo; + int status; + + dprintk("NFS call statfs\n"); + stat->fattr->valid = 0; + status = rpc_call(server->client, NFSPROC_STATFS, fhandle, &fsinfo, 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; + int status; + + dprintk("NFS call fsinfo\n"); + info->fattr->valid = 0; + status = rpc_call(server->client, NFSPROC_STATFS, fhandle, &fsinfo, 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; +} + +extern u32 * nfs_decode_dirent(u32 *, struct nfs_entry *, int); + +static void +nfs_read_done(struct rpc_task *task) +{ + struct nfs_read_data *data = (struct nfs_read_data *) task->tk_calldata; + + if (task->tk_status >= 0) { + nfs_refresh_inode(data->inode, data->res.fattr); + /* Emulate the eof flag, which isn't normally needed in NFSv2 + * as it is guaranteed to always return the file attributes + */ + if (data->args.offset + data->args.count >= data->res.fattr->size) + data->res.eof = 1; + } + nfs_readpage_result(task); +} + +static void +nfs_proc_read_setup(struct nfs_read_data *data) +{ + struct rpc_task *task = &data->task; + struct inode *inode = data->inode; + int flags; + struct rpc_message msg = { + .rpc_proc = &nfs_procedures[NFSPROC_READ], + .rpc_argp = &data->args, + .rpc_resp = &data->res, + .rpc_cred = data->cred, + }; + + /* N.B. Do we need to test? Never called for swapfile inode */ + flags = RPC_TASK_ASYNC | (IS_SWAPFILE(inode)? NFS_RPC_SWAPFLAGS : 0); + + /* Finalize the task. */ + rpc_init_task(task, NFS_CLIENT(inode), nfs_read_done, flags); + rpc_call_setup(task, &msg, 0); +} + +static void +nfs_write_done(struct rpc_task *task) +{ + struct nfs_write_data *data = (struct nfs_write_data *) task->tk_calldata; + + if (task->tk_status >= 0) + nfs_refresh_inode(data->inode, data->res.fattr); + nfs_writeback_done(task); +} + +static void +nfs_proc_write_setup(struct nfs_write_data *data, int how) +{ + struct rpc_task *task = &data->task; + struct inode *inode = data->inode; + int flags; + struct rpc_message msg = { + .rpc_proc = &nfs_procedures[NFSPROC_WRITE], + .rpc_argp = &data->args, + .rpc_resp = &data->res, + .rpc_cred = data->cred, + }; + + /* Note: NFSv2 ignores @stable and always uses NFS_FILE_SYNC */ + data->args.stable = NFS_FILE_SYNC; + + /* Set the initial flags for the task. */ + flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC; + + /* Finalize the task. */ + rpc_init_task(task, NFS_CLIENT(inode), nfs_write_done, flags); + rpc_call_setup(task, &msg, 0); +} + +static void +nfs_proc_commit_setup(struct nfs_write_data *data, int how) +{ + BUG(); +} + +static int +nfs_proc_lock(struct file *filp, int cmd, struct file_lock *fl) +{ + return nlmclnt_proc(filp->f_dentry->d_inode, cmd, fl); +} + + +struct nfs_rpc_ops nfs_v2_clientops = { + .version = 2, /* protocol version */ + .dentry_ops = &nfs_dentry_operations, + .dir_inode_ops = &nfs_dir_inode_operations, + .getroot = nfs_proc_get_root, + .getattr = nfs_proc_getattr, + .setattr = nfs_proc_setattr, + .lookup = nfs_proc_lookup, + .access = NULL, /* access */ + .readlink = nfs_proc_readlink, + .read = nfs_proc_read, + .write = nfs_proc_write, + .commit = NULL, /* commit */ + .create = nfs_proc_create, + .remove = nfs_proc_remove, + .unlink_setup = nfs_proc_unlink_setup, + .unlink_done = nfs_proc_unlink_done, + .rename = nfs_proc_rename, + .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 = nfs_decode_dirent, + .read_setup = nfs_proc_read_setup, + .write_setup = nfs_proc_write_setup, + .commit_setup = nfs_proc_commit_setup, + .file_open = nfs_open, + .file_release = nfs_release, + .lock = nfs_proc_lock, +}; |