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-rw-r--r--fs/nfs/proc.c655
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,
+};
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-01 22:18:13 +0000