1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 *  linux/fs/nfs/nfs3proc.c
   4 *
   5 *  Client-side NFSv3 procedures stubs.
   6 *
   7 *  Copyright (C) 1997, Olaf Kirch
   8 */
   9
  10#include <linux/mm.h>
  11#include <linux/errno.h>
  12#include <linux/string.h>
  13#include <linux/sunrpc/clnt.h>
  14#include <linux/slab.h>
  15#include <linux/nfs.h>
  16#include <linux/nfs3.h>
  17#include <linux/nfs_fs.h>
  18#include <linux/nfs_page.h>
  19#include <linux/lockd/bind.h>
  20#include <linux/nfs_mount.h>
  21#include <linux/freezer.h>
  22#include <linux/xattr.h>
  23
  24#include "iostat.h"
  25#include "internal.h"
  26#include "nfs3_fs.h"
  27
  28#define NFSDBG_FACILITY		NFSDBG_PROC
  29
  30/* A wrapper to handle the EJUKEBOX error messages */
  31static int
  32nfs3_rpc_wrapper(struct rpc_clnt *clnt, struct rpc_message *msg, int flags)
  33{
  34	int res;
  35	do {
  36		res = rpc_call_sync(clnt, msg, flags);
  37		if (res != -EJUKEBOX)
  38			break;
  39		__set_current_state(TASK_KILLABLE|TASK_FREEZABLE_UNSAFE);
  40		schedule_timeout(NFS_JUKEBOX_RETRY_TIME);
  41		res = -ERESTARTSYS;
  42	} while (!fatal_signal_pending(current));
  43	return res;
  44}
  45
  46#define rpc_call_sync(clnt, msg, flags)	nfs3_rpc_wrapper(clnt, msg, flags)
  47
  48static int
  49nfs3_async_handle_jukebox(struct rpc_task *task, struct inode *inode)
  50{
  51	if (task->tk_status != -EJUKEBOX)
  52		return 0;
  53	nfs_inc_stats(inode, NFSIOS_DELAY);
  54	task->tk_status = 0;
  55	rpc_restart_call(task);
  56	rpc_delay(task, NFS_JUKEBOX_RETRY_TIME);
  57	return 1;
  58}
  59
  60static int
  61do_proc_get_root(struct rpc_clnt *client, struct nfs_fh *fhandle,
  62		 struct nfs_fsinfo *info)
  63{
  64	struct rpc_message msg = {
  65		.rpc_proc	= &nfs3_procedures[NFS3PROC_FSINFO],
  66		.rpc_argp	= fhandle,
  67		.rpc_resp	= info,
  68	};
  69	int	status;
  70
  71	dprintk("%s: call  fsinfo\n", __func__);
  72	nfs_fattr_init(info->fattr);
  73	status = rpc_call_sync(client, &msg, 0);
  74	dprintk("%s: reply fsinfo: %d\n", __func__, status);
  75	if (status == 0 && !(info->fattr->valid & NFS_ATTR_FATTR)) {
  76		msg.rpc_proc = &nfs3_procedures[NFS3PROC_GETATTR];
  77		msg.rpc_resp = info->fattr;
  78		status = rpc_call_sync(client, &msg, 0);
  79		dprintk("%s: reply getattr: %d\n", __func__, status);
  80	}
  81	return status;
  82}
  83
  84/*
  85 * Bare-bones access to getattr: this is for nfs_get_root/nfs_get_sb
  86 */
  87static int
  88nfs3_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
  89		   struct nfs_fsinfo *info)
  90{
  91	int	status;
  92
  93	status = do_proc_get_root(server->client, fhandle, info);
  94	if (status && server->nfs_client->cl_rpcclient != server->client)
  95		status = do_proc_get_root(server->nfs_client->cl_rpcclient, fhandle, info);
  96	return status;
  97}
  98
  99/*
 100 * One function for each procedure in the NFS protocol.
 101 */
 102static int
 103nfs3_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
 104		struct nfs_fattr *fattr, struct inode *inode)
 105{
 106	struct rpc_message msg = {
 107		.rpc_proc	= &nfs3_procedures[NFS3PROC_GETATTR],
 108		.rpc_argp	= fhandle,
 109		.rpc_resp	= fattr,
 110	};
 111	int	status;
 112	unsigned short task_flags = 0;
 113
 114	/* Is this is an attribute revalidation, subject to softreval? */
 115	if (inode && (server->flags & NFS_MOUNT_SOFTREVAL))
 116		task_flags |= RPC_TASK_TIMEOUT;
 117
 118	dprintk("NFS call  getattr\n");
 119	nfs_fattr_init(fattr);
 120	status = rpc_call_sync(server->client, &msg, task_flags);
 121	dprintk("NFS reply getattr: %d\n", status);
 122	return status;
 123}
 124
 125static int
 126nfs3_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
 127			struct iattr *sattr)
 128{
 129	struct inode *inode = d_inode(dentry);
 130	struct nfs3_sattrargs	arg = {
 131		.fh		= NFS_FH(inode),
 132		.sattr		= sattr,
 133	};
 134	struct rpc_message msg = {
 135		.rpc_proc	= &nfs3_procedures[NFS3PROC_SETATTR],
 136		.rpc_argp	= &arg,
 137		.rpc_resp	= fattr,
 138	};
 139	int	status;
 140
 141	dprintk("NFS call  setattr\n");
 142	if (sattr->ia_valid & ATTR_FILE)
 143		msg.rpc_cred = nfs_file_cred(sattr->ia_file);
 144	nfs_fattr_init(fattr);
 145	status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
 146	if (status == 0) {
 147		nfs_setattr_update_inode(inode, sattr, fattr);
 148		if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
 149			nfs_zap_acl_cache(inode);
 150	}
 151	dprintk("NFS reply setattr: %d\n", status);
 152	return status;
 153}
 154
 155static int
 156__nfs3_proc_lookup(struct inode *dir, const char *name, size_t len,
 157		   struct nfs_fh *fhandle, struct nfs_fattr *fattr,
 158		   unsigned short task_flags)
 159{
 160	struct nfs3_diropargs	arg = {
 161		.fh		= NFS_FH(dir),
 162		.name		= name,
 163		.len		= len
 164	};
 165	struct nfs3_diropres	res = {
 166		.fh		= fhandle,
 167		.fattr		= fattr
 168	};
 169	struct rpc_message msg = {
 170		.rpc_proc	= &nfs3_procedures[NFS3PROC_LOOKUP],
 171		.rpc_argp	= &arg,
 172		.rpc_resp	= &res,
 173	};
 174	int			status;
 175
 176	res.dir_attr = nfs_alloc_fattr();
 177	if (res.dir_attr == NULL)
 178		return -ENOMEM;
 179
 180	nfs_fattr_init(fattr);
 181	status = rpc_call_sync(NFS_CLIENT(dir), &msg, task_flags);
 182	nfs_refresh_inode(dir, res.dir_attr);
 183	if (status >= 0 && !(fattr->valid & NFS_ATTR_FATTR)) {
 184		msg.rpc_proc = &nfs3_procedures[NFS3PROC_GETATTR];
 185		msg.rpc_argp = fhandle;
 186		msg.rpc_resp = fattr;
 187		status = rpc_call_sync(NFS_CLIENT(dir), &msg, task_flags);
 188	}
 189	nfs_free_fattr(res.dir_attr);
 190	dprintk("NFS reply lookup: %d\n", status);
 191	return status;
 192}
 193
 194static int
 195nfs3_proc_lookup(struct inode *dir, struct dentry *dentry,
 196		 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
 197{
 198	unsigned short task_flags = 0;
 199
 200	/* Is this is an attribute revalidation, subject to softreval? */
 201	if (nfs_lookup_is_soft_revalidate(dentry))
 202		task_flags |= RPC_TASK_TIMEOUT;
 203
 204	dprintk("NFS call  lookup %pd2\n", dentry);
 205	return __nfs3_proc_lookup(dir, dentry->d_name.name,
 206				  dentry->d_name.len, fhandle, fattr,
 207				  task_flags);
 208}
 209
 210static int nfs3_proc_lookupp(struct inode *inode, struct nfs_fh *fhandle,
 211			     struct nfs_fattr *fattr)
 212{
 213	const char dotdot[] = "..";
 214	const size_t len = strlen(dotdot);
 215	unsigned short task_flags = 0;
 216
 217	if (NFS_SERVER(inode)->flags & NFS_MOUNT_SOFTREVAL)
 218		task_flags |= RPC_TASK_TIMEOUT;
 219
 220	return __nfs3_proc_lookup(inode, dotdot, len, fhandle, fattr,
 221				  task_flags);
 222}
 223
 224static int nfs3_proc_access(struct inode *inode, struct nfs_access_entry *entry,
 225			    const struct cred *cred)
 226{
 227	struct nfs3_accessargs	arg = {
 228		.fh		= NFS_FH(inode),
 229		.access		= entry->mask,
 230	};
 231	struct nfs3_accessres	res;
 232	struct rpc_message msg = {
 233		.rpc_proc	= &nfs3_procedures[NFS3PROC_ACCESS],
 234		.rpc_argp	= &arg,
 235		.rpc_resp	= &res,
 236		.rpc_cred	= cred,
 237	};
 238	int status = -ENOMEM;
 239
 240	dprintk("NFS call  access\n");
 241	res.fattr = nfs_alloc_fattr();
 242	if (res.fattr == NULL)
 243		goto out;
 244
 245	status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
 246	nfs_refresh_inode(inode, res.fattr);
 247	if (status == 0)
 248		nfs_access_set_mask(entry, res.access);
 249	nfs_free_fattr(res.fattr);
 250out:
 251	dprintk("NFS reply access: %d\n", status);
 252	return status;
 253}
 254
 255static int nfs3_proc_readlink(struct inode *inode, struct page *page,
 256		unsigned int pgbase, unsigned int pglen)
 257{
 258	struct nfs_fattr	*fattr;
 259	struct nfs3_readlinkargs args = {
 260		.fh		= NFS_FH(inode),
 261		.pgbase		= pgbase,
 262		.pglen		= pglen,
 263		.pages		= &page
 264	};
 265	struct rpc_message msg = {
 266		.rpc_proc	= &nfs3_procedures[NFS3PROC_READLINK],
 267		.rpc_argp	= &args,
 268	};
 269	int status = -ENOMEM;
 270
 271	dprintk("NFS call  readlink\n");
 272	fattr = nfs_alloc_fattr();
 273	if (fattr == NULL)
 274		goto out;
 275	msg.rpc_resp = fattr;
 276
 277	status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
 278	nfs_refresh_inode(inode, fattr);
 279	nfs_free_fattr(fattr);
 280out:
 281	dprintk("NFS reply readlink: %d\n", status);
 282	return status;
 283}
 284
 285struct nfs3_createdata {
 286	struct rpc_message msg;
 287	union {
 288		struct nfs3_createargs create;
 289		struct nfs3_mkdirargs mkdir;
 290		struct nfs3_symlinkargs symlink;
 291		struct nfs3_mknodargs mknod;
 292	} arg;
 293	struct nfs3_diropres res;
 294	struct nfs_fh fh;
 295	struct nfs_fattr fattr;
 296	struct nfs_fattr dir_attr;
 297};
 298
 299static struct nfs3_createdata *nfs3_alloc_createdata(void)
 300{
 301	struct nfs3_createdata *data;
 302
 303	data = kzalloc(sizeof(*data), GFP_KERNEL);
 304	if (data != NULL) {
 305		data->msg.rpc_argp = &data->arg;
 306		data->msg.rpc_resp = &data->res;
 307		data->res.fh = &data->fh;
 308		data->res.fattr = &data->fattr;
 309		data->res.dir_attr = &data->dir_attr;
 310		nfs_fattr_init(data->res.fattr);
 311		nfs_fattr_init(data->res.dir_attr);
 312	}
 313	return data;
 314}
 315
 316static struct dentry *
 317nfs3_do_create(struct inode *dir, struct dentry *dentry, struct nfs3_createdata *data)
 318{
 319	int status;
 320
 321	status = rpc_call_sync(NFS_CLIENT(dir), &data->msg, 0);
 322	nfs_post_op_update_inode(dir, data->res.dir_attr);
 323	if (status != 0)
 324		return ERR_PTR(status);
 325
 326	return nfs_add_or_obtain(dentry, data->res.fh, data->res.fattr);
 327}
 328
 329static void nfs3_free_createdata(struct nfs3_createdata *data)
 330{
 331	kfree(data);
 332}
 333
 334/*
 335 * Create a regular file.
 336 */
 337static int
 338nfs3_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
 339		 int flags)
 340{
 341	struct posix_acl *default_acl, *acl;
 342	struct nfs3_createdata *data;
 343	struct dentry *d_alias;
 344	int status = -ENOMEM;
 345
 346	dprintk("NFS call  create %pd\n", dentry);
 347
 348	data = nfs3_alloc_createdata();
 349	if (data == NULL)
 350		goto out;
 351
 352	data->msg.rpc_proc = &nfs3_procedures[NFS3PROC_CREATE];
 353	data->arg.create.fh = NFS_FH(dir);
 354	data->arg.create.name = dentry->d_name.name;
 355	data->arg.create.len = dentry->d_name.len;
 356	data->arg.create.sattr = sattr;
 357
 358	data->arg.create.createmode = NFS3_CREATE_UNCHECKED;
 359	if (flags & O_EXCL) {
 360		data->arg.create.createmode  = NFS3_CREATE_EXCLUSIVE;
 361		data->arg.create.verifier[0] = cpu_to_be32(jiffies);
 362		data->arg.create.verifier[1] = cpu_to_be32(current->pid);
 363	}
 364
 365	status = posix_acl_create(dir, &sattr->ia_mode, &default_acl, &acl);
 366	if (status)
 367		goto out;
 368
 369	for (;;) {
 370		d_alias = nfs3_do_create(dir, dentry, data);
 371		status = PTR_ERR_OR_ZERO(d_alias);
 372
 373		if (status != -ENOTSUPP)
 374			break;
 375		/* If the server doesn't support the exclusive creation
 376		 * semantics, try again with simple 'guarded' mode. */
 377		switch (data->arg.create.createmode) {
 378			case NFS3_CREATE_EXCLUSIVE:
 379				data->arg.create.createmode = NFS3_CREATE_GUARDED;
 380				break;
 381
 382			case NFS3_CREATE_GUARDED:
 383				data->arg.create.createmode = NFS3_CREATE_UNCHECKED;
 384				break;
 385
 386			case NFS3_CREATE_UNCHECKED:
 387				goto out_release_acls;
 388		}
 389		nfs_fattr_init(data->res.dir_attr);
 390		nfs_fattr_init(data->res.fattr);
 391	}
 392
 393	if (status != 0)
 394		goto out_release_acls;
 395
 396	if (d_alias)
 397		dentry = d_alias;
 398
 399	/* When we created the file with exclusive semantics, make
 400	 * sure we set the attributes afterwards. */
 401	if (data->arg.create.createmode == NFS3_CREATE_EXCLUSIVE) {
 402		dprintk("NFS call  setattr (post-create)\n");
 403
 404		if (!(sattr->ia_valid & ATTR_ATIME_SET))
 405			sattr->ia_valid |= ATTR_ATIME;
 406		if (!(sattr->ia_valid & ATTR_MTIME_SET))
 407			sattr->ia_valid |= ATTR_MTIME;
 408
 409		/* Note: we could use a guarded setattr here, but I'm
 410		 * not sure this buys us anything (and I'd have
 411		 * to revamp the NFSv3 XDR code) */
 412		status = nfs3_proc_setattr(dentry, data->res.fattr, sattr);
 413		nfs_post_op_update_inode(d_inode(dentry), data->res.fattr);
 414		dprintk("NFS reply setattr (post-create): %d\n", status);
 415		if (status != 0)
 416			goto out_dput;
 417	}
 418
 419	status = nfs3_proc_setacls(d_inode(dentry), acl, default_acl);
 420
 421out_dput:
 422	dput(d_alias);
 423out_release_acls:
 424	posix_acl_release(acl);
 425	posix_acl_release(default_acl);
 426out:
 427	nfs3_free_createdata(data);
 428	dprintk("NFS reply create: %d\n", status);
 429	return status;
 430}
 431
 432static int
 433nfs3_proc_remove(struct inode *dir, struct dentry *dentry)
 434{
 435	struct nfs_removeargs arg = {
 436		.fh = NFS_FH(dir),
 437		.name = dentry->d_name,
 438	};
 439	struct nfs_removeres res;
 440	struct rpc_message msg = {
 441		.rpc_proc = &nfs3_procedures[NFS3PROC_REMOVE],
 442		.rpc_argp = &arg,
 443		.rpc_resp = &res,
 444	};
 445	int status = -ENOMEM;
 446
 447	dprintk("NFS call  remove %pd2\n", dentry);
 448	res.dir_attr = nfs_alloc_fattr();
 449	if (res.dir_attr == NULL)
 450		goto out;
 451
 452	status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 453	nfs_post_op_update_inode(dir, res.dir_attr);
 454	nfs_free_fattr(res.dir_attr);
 455out:
 456	dprintk("NFS reply remove: %d\n", status);
 457	return status;
 458}
 459
 460static void
 461nfs3_proc_unlink_setup(struct rpc_message *msg,
 462		struct dentry *dentry,
 463		struct inode *inode)
 464{
 465	msg->rpc_proc = &nfs3_procedures[NFS3PROC_REMOVE];
 466}
 467
 468static void nfs3_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
 469{
 470	rpc_call_start(task);
 471}
 472
 473static int
 474nfs3_proc_unlink_done(struct rpc_task *task, struct inode *dir)
 475{
 476	struct nfs_removeres *res;
 477	if (nfs3_async_handle_jukebox(task, dir))
 478		return 0;
 479	res = task->tk_msg.rpc_resp;
 480	nfs_post_op_update_inode(dir, res->dir_attr);
 481	return 1;
 482}
 483
 484static void
 485nfs3_proc_rename_setup(struct rpc_message *msg,
 486		struct dentry *old_dentry,
 487		struct dentry *new_dentry)
 488{
 489	msg->rpc_proc = &nfs3_procedures[NFS3PROC_RENAME];
 490}
 491
 492static void nfs3_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
 493{
 494	rpc_call_start(task);
 495}
 496
 497static int
 498nfs3_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
 499		      struct inode *new_dir)
 500{
 501	struct nfs_renameres *res;
 502
 503	if (nfs3_async_handle_jukebox(task, old_dir))
 504		return 0;
 505	res = task->tk_msg.rpc_resp;
 506
 507	nfs_post_op_update_inode(old_dir, res->old_fattr);
 508	nfs_post_op_update_inode(new_dir, res->new_fattr);
 509	return 1;
 510}
 511
 512static int
 513nfs3_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name)
 514{
 515	struct nfs3_linkargs	arg = {
 516		.fromfh		= NFS_FH(inode),
 517		.tofh		= NFS_FH(dir),
 518		.toname		= name->name,
 519		.tolen		= name->len
 520	};
 521	struct nfs3_linkres	res;
 522	struct rpc_message msg = {
 523		.rpc_proc	= &nfs3_procedures[NFS3PROC_LINK],
 524		.rpc_argp	= &arg,
 525		.rpc_resp	= &res,
 526	};
 527	int status = -ENOMEM;
 528
 529	dprintk("NFS call  link %s\n", name->name);
 530	res.fattr = nfs_alloc_fattr();
 531	res.dir_attr = nfs_alloc_fattr();
 532	if (res.fattr == NULL || res.dir_attr == NULL)
 533		goto out;
 534
 535	status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
 536	nfs_post_op_update_inode(dir, res.dir_attr);
 537	nfs_post_op_update_inode(inode, res.fattr);
 538out:
 539	nfs_free_fattr(res.dir_attr);
 540	nfs_free_fattr(res.fattr);
 541	dprintk("NFS reply link: %d\n", status);
 542	return status;
 543}
 544
 545static int
 546nfs3_proc_symlink(struct inode *dir, struct dentry *dentry, struct folio *folio,
 547		  unsigned int len, struct iattr *sattr)
 548{
 549	struct page *page = &folio->page;
 550	struct nfs3_createdata *data;
 551	struct dentry *d_alias;
 552	int status = -ENOMEM;
 553
 554	if (len > NFS3_MAXPATHLEN)
 555		return -ENAMETOOLONG;
 556
 557	dprintk("NFS call  symlink %pd\n", dentry);
 558
 559	data = nfs3_alloc_createdata();
 560	if (data == NULL)
 561		goto out;
 562	data->msg.rpc_proc = &nfs3_procedures[NFS3PROC_SYMLINK];
 563	data->arg.symlink.fromfh = NFS_FH(dir);
 564	data->arg.symlink.fromname = dentry->d_name.name;
 565	data->arg.symlink.fromlen = dentry->d_name.len;
 566	data->arg.symlink.pages = &page;
 567	data->arg.symlink.pathlen = len;
 568	data->arg.symlink.sattr = sattr;
 569
 570	d_alias = nfs3_do_create(dir, dentry, data);
 571	status = PTR_ERR_OR_ZERO(d_alias);
 572
 573	if (status == 0)
 574		dput(d_alias);
 575
 576	nfs3_free_createdata(data);
 577out:
 578	dprintk("NFS reply symlink: %d\n", status);
 579	return status;
 580}
 581
 582static int
 583nfs3_proc_mkdir(struct inode *dir, struct dentry *dentry, struct iattr *sattr)
 584{
 585	struct posix_acl *default_acl, *acl;
 586	struct nfs3_createdata *data;
 587	struct dentry *d_alias;
 588	int status = -ENOMEM;
 589
 590	dprintk("NFS call  mkdir %pd\n", dentry);
 591
 592	data = nfs3_alloc_createdata();
 593	if (data == NULL)
 594		goto out;
 595
 596	status = posix_acl_create(dir, &sattr->ia_mode, &default_acl, &acl);
 597	if (status)
 598		goto out;
 599
 600	data->msg.rpc_proc = &nfs3_procedures[NFS3PROC_MKDIR];
 601	data->arg.mkdir.fh = NFS_FH(dir);
 602	data->arg.mkdir.name = dentry->d_name.name;
 603	data->arg.mkdir.len = dentry->d_name.len;
 604	data->arg.mkdir.sattr = sattr;
 605
 606	d_alias = nfs3_do_create(dir, dentry, data);
 607	status = PTR_ERR_OR_ZERO(d_alias);
 608
 609	if (status != 0)
 610		goto out_release_acls;
 611
 612	if (d_alias)
 613		dentry = d_alias;
 614
 615	status = nfs3_proc_setacls(d_inode(dentry), acl, default_acl);
 616
 617	dput(d_alias);
 618out_release_acls:
 619	posix_acl_release(acl);
 620	posix_acl_release(default_acl);
 621out:
 622	nfs3_free_createdata(data);
 623	dprintk("NFS reply mkdir: %d\n", status);
 624	return status;
 625}
 626
 627static int
 628nfs3_proc_rmdir(struct inode *dir, const struct qstr *name)
 629{
 630	struct nfs_fattr	*dir_attr;
 631	struct nfs3_diropargs	arg = {
 632		.fh		= NFS_FH(dir),
 633		.name		= name->name,
 634		.len		= name->len
 635	};
 636	struct rpc_message msg = {
 637		.rpc_proc	= &nfs3_procedures[NFS3PROC_RMDIR],
 638		.rpc_argp	= &arg,
 639	};
 640	int status = -ENOMEM;
 641
 642	dprintk("NFS call  rmdir %s\n", name->name);
 643	dir_attr = nfs_alloc_fattr();
 644	if (dir_attr == NULL)
 645		goto out;
 646
 647	msg.rpc_resp = dir_attr;
 648	status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 649	nfs_post_op_update_inode(dir, dir_attr);
 650	nfs_free_fattr(dir_attr);
 651out:
 652	dprintk("NFS reply rmdir: %d\n", status);
 653	return status;
 654}
 655
 656/*
 657 * The READDIR implementation is somewhat hackish - we pass the user buffer
 658 * to the encode function, which installs it in the receive iovec.
 659 * The decode function itself doesn't perform any decoding, it just makes
 660 * sure the reply is syntactically correct.
 661 *
 662 * Also note that this implementation handles both plain readdir and
 663 * readdirplus.
 664 */
 665static int nfs3_proc_readdir(struct nfs_readdir_arg *nr_arg,
 666			     struct nfs_readdir_res *nr_res)
 667{
 668	struct inode		*dir = d_inode(nr_arg->dentry);
 669	struct nfs3_readdirargs	arg = {
 670		.fh		= NFS_FH(dir),
 671		.cookie		= nr_arg->cookie,
 672		.plus		= nr_arg->plus,
 673		.count		= nr_arg->page_len,
 674		.pages		= nr_arg->pages
 675	};
 676	struct nfs3_readdirres	res = {
 677		.verf		= nr_res->verf,
 678		.plus		= nr_arg->plus,
 679	};
 680	struct rpc_message	msg = {
 681		.rpc_proc	= &nfs3_procedures[NFS3PROC_READDIR],
 682		.rpc_argp	= &arg,
 683		.rpc_resp	= &res,
 684		.rpc_cred	= nr_arg->cred,
 685	};
 686	int status = -ENOMEM;
 687
 688	if (nr_arg->plus)
 689		msg.rpc_proc = &nfs3_procedures[NFS3PROC_READDIRPLUS];
 690	if (arg.cookie)
 691		memcpy(arg.verf, nr_arg->verf, sizeof(arg.verf));
 692
 693	dprintk("NFS call  readdir%s %llu\n", nr_arg->plus ? "plus" : "",
 694		(unsigned long long)nr_arg->cookie);
 695
 696	res.dir_attr = nfs_alloc_fattr();
 697	if (res.dir_attr == NULL)
 698		goto out;
 699
 700	status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 701
 702	nfs_invalidate_atime(dir);
 703	nfs_refresh_inode(dir, res.dir_attr);
 704
 705	nfs_free_fattr(res.dir_attr);
 706out:
 707	dprintk("NFS reply readdir%s: %d\n", nr_arg->plus ? "plus" : "",
 708		status);
 709	return status;
 710}
 711
 712static int
 713nfs3_proc_mknod(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
 714		dev_t rdev)
 715{
 716	struct posix_acl *default_acl, *acl;
 717	struct nfs3_createdata *data;
 718	struct dentry *d_alias;
 719	int status = -ENOMEM;
 720
 721	dprintk("NFS call  mknod %pd %u:%u\n", dentry,
 722			MAJOR(rdev), MINOR(rdev));
 723
 724	data = nfs3_alloc_createdata();
 725	if (data == NULL)
 726		goto out;
 727
 728	status = posix_acl_create(dir, &sattr->ia_mode, &default_acl, &acl);
 729	if (status)
 730		goto out;
 731
 732	data->msg.rpc_proc = &nfs3_procedures[NFS3PROC_MKNOD];
 733	data->arg.mknod.fh = NFS_FH(dir);
 734	data->arg.mknod.name = dentry->d_name.name;
 735	data->arg.mknod.len = dentry->d_name.len;
 736	data->arg.mknod.sattr = sattr;
 737	data->arg.mknod.rdev = rdev;
 738
 739	switch (sattr->ia_mode & S_IFMT) {
 740	case S_IFBLK:
 741		data->arg.mknod.type = NF3BLK;
 742		break;
 743	case S_IFCHR:
 744		data->arg.mknod.type = NF3CHR;
 745		break;
 746	case S_IFIFO:
 747		data->arg.mknod.type = NF3FIFO;
 748		break;
 749	case S_IFSOCK:
 750		data->arg.mknod.type = NF3SOCK;
 751		break;
 752	default:
 753		status = -EINVAL;
 754		goto out_release_acls;
 755	}
 756
 757	d_alias = nfs3_do_create(dir, dentry, data);
 758	status = PTR_ERR_OR_ZERO(d_alias);
 759	if (status != 0)
 760		goto out_release_acls;
 761
 762	if (d_alias)
 763		dentry = d_alias;
 764
 765	status = nfs3_proc_setacls(d_inode(dentry), acl, default_acl);
 766
 767	dput(d_alias);
 768out_release_acls:
 769	posix_acl_release(acl);
 770	posix_acl_release(default_acl);
 771out:
 772	nfs3_free_createdata(data);
 773	dprintk("NFS reply mknod: %d\n", status);
 774	return status;
 775}
 776
 777static int
 778nfs3_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
 779		 struct nfs_fsstat *stat)
 780{
 781	struct rpc_message msg = {
 782		.rpc_proc	= &nfs3_procedures[NFS3PROC_FSSTAT],
 783		.rpc_argp	= fhandle,
 784		.rpc_resp	= stat,
 785	};
 786	int	status;
 787
 788	dprintk("NFS call  fsstat\n");
 789	nfs_fattr_init(stat->fattr);
 790	status = rpc_call_sync(server->client, &msg, 0);
 791	dprintk("NFS reply fsstat: %d\n", status);
 792	return status;
 793}
 794
 795static int
 796do_proc_fsinfo(struct rpc_clnt *client, struct nfs_fh *fhandle,
 797		 struct nfs_fsinfo *info)
 798{
 799	struct rpc_message msg = {
 800		.rpc_proc	= &nfs3_procedures[NFS3PROC_FSINFO],
 801		.rpc_argp	= fhandle,
 802		.rpc_resp	= info,
 803	};
 804	int	status;
 805
 806	dprintk("NFS call  fsinfo\n");
 807	nfs_fattr_init(info->fattr);
 808	status = rpc_call_sync(client, &msg, 0);
 809	dprintk("NFS reply fsinfo: %d\n", status);
 810	return status;
 811}
 812
 813/*
 814 * Bare-bones access to fsinfo: this is for nfs_get_root/nfs_get_sb via
 815 * nfs_create_server
 816 */
 817static int
 818nfs3_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
 819		   struct nfs_fsinfo *info)
 820{
 821	int	status;
 822
 823	status = do_proc_fsinfo(server->client, fhandle, info);
 824	if (status && server->nfs_client->cl_rpcclient != server->client)
 825		status = do_proc_fsinfo(server->nfs_client->cl_rpcclient, fhandle, info);
 826	return status;
 827}
 828
 829static int
 830nfs3_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
 831		   struct nfs_pathconf *info)
 832{
 833	struct rpc_message msg = {
 834		.rpc_proc	= &nfs3_procedures[NFS3PROC_PATHCONF],
 835		.rpc_argp	= fhandle,
 836		.rpc_resp	= info,
 837	};
 838	int	status;
 839
 840	dprintk("NFS call  pathconf\n");
 841	nfs_fattr_init(info->fattr);
 842	status = rpc_call_sync(server->client, &msg, 0);
 843	dprintk("NFS reply pathconf: %d\n", status);
 844	return status;
 845}
 846
 847static int nfs3_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
 848{
 849	struct inode *inode = hdr->inode;
 850	struct nfs_server *server = NFS_SERVER(inode);
 851
 852	if (hdr->pgio_done_cb != NULL)
 853		return hdr->pgio_done_cb(task, hdr);
 854
 855	if (nfs3_async_handle_jukebox(task, inode))
 856		return -EAGAIN;
 857
 858	if (task->tk_status >= 0 && !server->read_hdrsize)
 859		cmpxchg(&server->read_hdrsize, 0, hdr->res.replen);
 860
 861	nfs_invalidate_atime(inode);
 862	nfs_refresh_inode(inode, &hdr->fattr);
 863	return 0;
 864}
 865
 866static void nfs3_proc_read_setup(struct nfs_pgio_header *hdr,
 867				 struct rpc_message *msg)
 868{
 869	msg->rpc_proc = &nfs3_procedures[NFS3PROC_READ];
 870	hdr->args.replen = NFS_SERVER(hdr->inode)->read_hdrsize;
 871}
 872
 873static int nfs3_proc_pgio_rpc_prepare(struct rpc_task *task,
 874				      struct nfs_pgio_header *hdr)
 875{
 876	rpc_call_start(task);
 877	return 0;
 878}
 879
 880static int nfs3_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
 881{
 882	struct inode *inode = hdr->inode;
 883
 884	if (hdr->pgio_done_cb != NULL)
 885		return hdr->pgio_done_cb(task, hdr);
 886
 887	if (nfs3_async_handle_jukebox(task, inode))
 888		return -EAGAIN;
 889	if (task->tk_status >= 0)
 890		nfs_writeback_update_inode(hdr);
 891	return 0;
 892}
 893
 894static void nfs3_proc_write_setup(struct nfs_pgio_header *hdr,
 895				  struct rpc_message *msg,
 896				  struct rpc_clnt **clnt)
 897{
 898	msg->rpc_proc = &nfs3_procedures[NFS3PROC_WRITE];
 899}
 900
 901static void nfs3_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
 902{
 903	rpc_call_start(task);
 904}
 905
 906static int nfs3_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
 907{
 908	if (data->commit_done_cb != NULL)
 909		return data->commit_done_cb(task, data);
 910
 911	if (nfs3_async_handle_jukebox(task, data->inode))
 912		return -EAGAIN;
 913	nfs_refresh_inode(data->inode, data->res.fattr);
 914	return 0;
 915}
 916
 917static void nfs3_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg,
 918				   struct rpc_clnt **clnt)
 919{
 920	msg->rpc_proc = &nfs3_procedures[NFS3PROC_COMMIT];
 921}
 922
 923static void nfs3_nlm_alloc_call(void *data)
 924{
 925	struct nfs_lock_context *l_ctx = data;
 926	if (l_ctx && test_bit(NFS_CONTEXT_UNLOCK, &l_ctx->open_context->flags)) {
 927		get_nfs_open_context(l_ctx->open_context);
 928		nfs_get_lock_context(l_ctx->open_context);
 929	}
 930}
 931
 932static bool nfs3_nlm_unlock_prepare(struct rpc_task *task, void *data)
 933{
 934	struct nfs_lock_context *l_ctx = data;
 935	if (l_ctx && test_bit(NFS_CONTEXT_UNLOCK, &l_ctx->open_context->flags))
 936		return nfs_async_iocounter_wait(task, l_ctx);
 937	return false;
 938
 939}
 940
 941static void nfs3_nlm_release_call(void *data)
 942{
 943	struct nfs_lock_context *l_ctx = data;
 944	struct nfs_open_context *ctx;
 945	if (l_ctx && test_bit(NFS_CONTEXT_UNLOCK, &l_ctx->open_context->flags)) {
 946		ctx = l_ctx->open_context;
 947		nfs_put_lock_context(l_ctx);
 948		put_nfs_open_context(ctx);
 949	}
 950}
 951
 952static const struct nlmclnt_operations nlmclnt_fl_close_lock_ops = {
 953	.nlmclnt_alloc_call = nfs3_nlm_alloc_call,
 954	.nlmclnt_unlock_prepare = nfs3_nlm_unlock_prepare,
 955	.nlmclnt_release_call = nfs3_nlm_release_call,
 956};
 957
 958static int
 959nfs3_proc_lock(struct file *filp, int cmd, struct file_lock *fl)
 960{
 961	struct inode *inode = file_inode(filp);
 962	struct nfs_lock_context *l_ctx = NULL;
 963	struct nfs_open_context *ctx = nfs_file_open_context(filp);
 964	int status;
 965
 966	if (fl->c.flc_flags & FL_CLOSE) {
 967		l_ctx = nfs_get_lock_context(ctx);
 968		if (IS_ERR(l_ctx))
 969			l_ctx = NULL;
 970		else
 971			set_bit(NFS_CONTEXT_UNLOCK, &ctx->flags);
 972	}
 973
 974	status = nlmclnt_proc(NFS_SERVER(inode)->nlm_host, cmd, fl, l_ctx);
 975
 976	if (l_ctx)
 977		nfs_put_lock_context(l_ctx);
 978
 979	return status;
 980}
 981
 982static int nfs3_have_delegation(struct inode *inode, fmode_t flags)
 983{
 984	return 0;
 985}
 986
 
 
 
 
 
 
 
 987static const struct inode_operations nfs3_dir_inode_operations = {
 988	.create		= nfs_create,
 
 989	.lookup		= nfs_lookup,
 990	.link		= nfs_link,
 991	.unlink		= nfs_unlink,
 992	.symlink	= nfs_symlink,
 993	.mkdir		= nfs_mkdir,
 994	.rmdir		= nfs_rmdir,
 995	.mknod		= nfs_mknod,
 996	.rename		= nfs_rename,
 997	.permission	= nfs_permission,
 998	.getattr	= nfs_getattr,
 999	.setattr	= nfs_setattr,
1000#ifdef CONFIG_NFS_V3_ACL
1001	.listxattr	= nfs3_listxattr,
1002	.get_inode_acl	= nfs3_get_acl,
1003	.set_acl	= nfs3_set_acl,
1004#endif
1005};
1006
1007static const struct inode_operations nfs3_file_inode_operations = {
1008	.permission	= nfs_permission,
1009	.getattr	= nfs_getattr,
1010	.setattr	= nfs_setattr,
1011#ifdef CONFIG_NFS_V3_ACL
1012	.listxattr	= nfs3_listxattr,
1013	.get_inode_acl	= nfs3_get_acl,
1014	.set_acl	= nfs3_set_acl,
1015#endif
1016};
1017
1018const struct nfs_rpc_ops nfs_v3_clientops = {
1019	.version	= 3,			/* protocol version */
1020	.dentry_ops	= &nfs_dentry_operations,
1021	.dir_inode_ops	= &nfs3_dir_inode_operations,
1022	.file_inode_ops	= &nfs3_file_inode_operations,
1023	.file_ops	= &nfs_file_operations,
1024	.nlmclnt_ops	= &nlmclnt_fl_close_lock_ops,
1025	.getroot	= nfs3_proc_get_root,
1026	.submount	= nfs_submount,
1027	.try_get_tree	= nfs_try_get_tree,
1028	.getattr	= nfs3_proc_getattr,
1029	.setattr	= nfs3_proc_setattr,
1030	.lookup		= nfs3_proc_lookup,
1031	.lookupp	= nfs3_proc_lookupp,
1032	.access		= nfs3_proc_access,
1033	.readlink	= nfs3_proc_readlink,
1034	.create		= nfs3_proc_create,
1035	.remove		= nfs3_proc_remove,
1036	.unlink_setup	= nfs3_proc_unlink_setup,
1037	.unlink_rpc_prepare = nfs3_proc_unlink_rpc_prepare,
1038	.unlink_done	= nfs3_proc_unlink_done,
1039	.rename_setup	= nfs3_proc_rename_setup,
1040	.rename_rpc_prepare = nfs3_proc_rename_rpc_prepare,
1041	.rename_done	= nfs3_proc_rename_done,
1042	.link		= nfs3_proc_link,
1043	.symlink	= nfs3_proc_symlink,
1044	.mkdir		= nfs3_proc_mkdir,
1045	.rmdir		= nfs3_proc_rmdir,
1046	.readdir	= nfs3_proc_readdir,
1047	.mknod		= nfs3_proc_mknod,
1048	.statfs		= nfs3_proc_statfs,
1049	.fsinfo		= nfs3_proc_fsinfo,
1050	.pathconf	= nfs3_proc_pathconf,
1051	.decode_dirent	= nfs3_decode_dirent,
1052	.pgio_rpc_prepare = nfs3_proc_pgio_rpc_prepare,
1053	.read_setup	= nfs3_proc_read_setup,
1054	.read_done	= nfs3_read_done,
1055	.write_setup	= nfs3_proc_write_setup,
1056	.write_done	= nfs3_write_done,
1057	.commit_setup	= nfs3_proc_commit_setup,
1058	.commit_rpc_prepare = nfs3_proc_commit_rpc_prepare,
1059	.commit_done	= nfs3_commit_done,
1060	.lock		= nfs3_proc_lock,
1061	.clear_acl_cache = forget_all_cached_acls,
1062	.close_context	= nfs_close_context,
1063	.have_delegation = nfs3_have_delegation,
 
1064	.alloc_client	= nfs_alloc_client,
1065	.init_client	= nfs_init_client,
1066	.free_client	= nfs_free_client,
1067	.create_server	= nfs3_create_server,
1068	.clone_server	= nfs3_clone_server,
1069};