blob: 53e02b8bd9bd21df75bfbe2c3fbb0b49de76e4b1 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/fs/nfs/dir.c
3 *
4 * Copyright (C) 1992 Rick Sladkey
5 *
6 * nfs directory handling functions
7 *
8 * 10 Apr 1996 Added silly rename for unlink --okir
9 * 28 Sep 1996 Improved directory cache --okir
10 * 23 Aug 1997 Claus Heine claus@momo.math.rwth-aachen.de
11 * Re-implemented silly rename for unlink, newly implemented
12 * silly rename for nfs_rename() following the suggestions
13 * of Olaf Kirch (okir) found in this file.
14 * Following Linus comments on my original hack, this version
15 * depends only on the dcache stuff and doesn't touch the inode
16 * layer (iput() and friends).
17 * 6 Jun 1999 Cache readdir lookups in the page cache. -DaveM
18 */
19
Bryan Schumakerddda8e02012-07-30 16:05:23 -040020#include <linux/module.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070021#include <linux/time.h>
22#include <linux/errno.h>
23#include <linux/stat.h>
24#include <linux/fcntl.h>
25#include <linux/string.h>
26#include <linux/kernel.h>
27#include <linux/slab.h>
28#include <linux/mm.h>
29#include <linux/sunrpc/clnt.h>
30#include <linux/nfs_fs.h>
31#include <linux/nfs_mount.h>
32#include <linux/pagemap.h>
Chuck Lever873101b2006-08-22 20:06:23 -040033#include <linux/pagevec.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070034#include <linux/namei.h>
David Howells54ceac42006-08-22 20:06:13 -040035#include <linux/mount.h>
Mel Gormana0b8cab32013-07-03 15:02:32 -070036#include <linux/swap.h>
Alexey Dobriyane8edc6e2007-05-21 01:22:52 +040037#include <linux/sched.h>
Catalin Marinas04e4bd12010-11-11 12:53:47 +000038#include <linux/kmemleak.h>
Aneesh Kumar K.V64c2ce82010-12-09 11:35:25 +000039#include <linux/xattr.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070040
41#include "delegation.h"
Chuck Lever91d5b472006-03-20 13:44:14 -050042#include "iostat.h"
Adrian Bunk4c30d562007-11-21 15:04:31 -080043#include "internal.h"
Trond Myklebustcd9a1c02010-09-17 10:56:50 -040044#include "fscache.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070045
Trond Myklebustf4ce1292013-08-19 18:59:33 -040046#include "nfstrace.h"
47
Linus Torvalds1da177e2005-04-16 15:20:36 -070048/* #define NFS_DEBUG_VERBOSE 1 */
49
50static int nfs_opendir(struct inode *, struct file *);
Bryan Schumaker480c2002011-03-23 14:48:29 -040051static int nfs_closedir(struct inode *, struct file *);
Al Viro23db8622013-05-17 16:34:50 -040052static int nfs_readdir(struct file *, struct dir_context *);
Josef Bacik02c24a82011-07-16 20:44:56 -040053static int nfs_fsync_dir(struct file *, loff_t, loff_t, int);
Trond Myklebustf0dd2132005-06-22 17:16:29 +000054static loff_t nfs_llseek_dir(struct file *, loff_t, int);
Trond Myklebust11de3b12010-12-01 14:17:06 -050055static void nfs_readdir_clear_array(struct page*);
Linus Torvalds1da177e2005-04-16 15:20:36 -070056
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -080057const struct file_operations nfs_dir_operations = {
Trond Myklebustf0dd2132005-06-22 17:16:29 +000058 .llseek = nfs_llseek_dir,
Linus Torvalds1da177e2005-04-16 15:20:36 -070059 .read = generic_read_dir,
Al Viro9ac3d3e2016-04-28 19:52:56 -040060 .iterate_shared = nfs_readdir,
Linus Torvalds1da177e2005-04-16 15:20:36 -070061 .open = nfs_opendir,
Bryan Schumaker480c2002011-03-23 14:48:29 -040062 .release = nfs_closedir,
Linus Torvalds1da177e2005-04-16 15:20:36 -070063 .fsync = nfs_fsync_dir,
64};
65
Trond Myklebust11de3b12010-12-01 14:17:06 -050066const struct address_space_operations nfs_dir_aops = {
67 .freepage = nfs_readdir_clear_array,
Bryan Schumakerd1bacf92010-09-24 14:48:42 -040068};
69
Trond Myklebust0c030802011-07-30 12:45:35 -040070static struct nfs_open_dir_context *alloc_nfs_open_dir_context(struct inode *dir, struct rpc_cred *cred)
Bryan Schumaker480c2002011-03-23 14:48:29 -040071{
Trond Myklebust311324a2014-02-07 17:02:08 -050072 struct nfs_inode *nfsi = NFS_I(dir);
Bryan Schumaker480c2002011-03-23 14:48:29 -040073 struct nfs_open_dir_context *ctx;
74 ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
75 if (ctx != NULL) {
Bryan Schumaker8ef2ce32011-03-23 15:04:31 -040076 ctx->duped = 0;
Trond Myklebust311324a2014-02-07 17:02:08 -050077 ctx->attr_gencount = nfsi->attr_gencount;
Bryan Schumaker480c2002011-03-23 14:48:29 -040078 ctx->dir_cookie = 0;
Bryan Schumaker8ef2ce32011-03-23 15:04:31 -040079 ctx->dup_cookie = 0;
Bryan Schumaker480c2002011-03-23 14:48:29 -040080 ctx->cred = get_rpccred(cred);
Trond Myklebust311324a2014-02-07 17:02:08 -050081 spin_lock(&dir->i_lock);
82 list_add(&ctx->list, &nfsi->open_files);
83 spin_unlock(&dir->i_lock);
Trond Myklebust0c030802011-07-30 12:45:35 -040084 return ctx;
85 }
86 return ERR_PTR(-ENOMEM);
Bryan Schumaker480c2002011-03-23 14:48:29 -040087}
88
Trond Myklebust311324a2014-02-07 17:02:08 -050089static void put_nfs_open_dir_context(struct inode *dir, struct nfs_open_dir_context *ctx)
Bryan Schumaker480c2002011-03-23 14:48:29 -040090{
Trond Myklebust311324a2014-02-07 17:02:08 -050091 spin_lock(&dir->i_lock);
92 list_del(&ctx->list);
93 spin_unlock(&dir->i_lock);
Bryan Schumaker480c2002011-03-23 14:48:29 -040094 put_rpccred(ctx->cred);
95 kfree(ctx);
96}
97
Linus Torvalds1da177e2005-04-16 15:20:36 -070098/*
99 * Open file
100 */
101static int
102nfs_opendir(struct inode *inode, struct file *filp)
103{
Bryan Schumaker480c2002011-03-23 14:48:29 -0400104 int res = 0;
105 struct nfs_open_dir_context *ctx;
106 struct rpc_cred *cred;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107
Al Viro6de14722013-09-16 10:53:17 -0400108 dfprintk(FILE, "NFS: open dir(%pD2)\n", filp);
Chuck Levercc0dd2d2008-06-11 17:55:42 -0400109
110 nfs_inc_stats(inode, NFSIOS_VFSOPEN);
Chuck Lever1e7cb3d2006-03-20 13:44:24 -0500111
Bryan Schumaker480c2002011-03-23 14:48:29 -0400112 cred = rpc_lookup_cred();
113 if (IS_ERR(cred))
114 return PTR_ERR(cred);
Trond Myklebust0c030802011-07-30 12:45:35 -0400115 ctx = alloc_nfs_open_dir_context(inode, cred);
Bryan Schumaker480c2002011-03-23 14:48:29 -0400116 if (IS_ERR(ctx)) {
117 res = PTR_ERR(ctx);
118 goto out;
119 }
120 filp->private_data = ctx;
Neil Brownf5a73672010-08-10 10:20:05 -0400121 if (filp->f_path.dentry == filp->f_path.mnt->mnt_root) {
122 /* This is a mountpoint, so d_revalidate will never
123 * have been called, so we need to refresh the
124 * inode (for close-open consistency) ourselves.
125 */
126 __nfs_revalidate_inode(NFS_SERVER(inode), inode);
127 }
Bryan Schumaker480c2002011-03-23 14:48:29 -0400128out:
129 put_rpccred(cred);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130 return res;
131}
132
Bryan Schumaker480c2002011-03-23 14:48:29 -0400133static int
134nfs_closedir(struct inode *inode, struct file *filp)
135{
Al Viroa4555892014-10-21 20:11:25 -0400136 put_nfs_open_dir_context(file_inode(filp), filp->private_data);
Bryan Schumaker480c2002011-03-23 14:48:29 -0400137 return 0;
138}
139
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400140struct nfs_cache_array_entry {
141 u64 cookie;
142 u64 ino;
143 struct qstr string;
Trond Myklebust0b26a0b2010-11-20 14:26:44 -0500144 unsigned char d_type;
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400145};
146
147struct nfs_cache_array {
Al Viro9ac3d3e2016-04-28 19:52:56 -0400148 atomic_t refcount;
Chuck Lever88b8e132012-03-01 17:00:23 -0500149 int size;
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400150 int eof_index;
151 u64 last_cookie;
152 struct nfs_cache_array_entry array[0];
153};
154
Chuck Lever573c4e12010-12-14 14:58:11 +0000155typedef int (*decode_dirent_t)(struct xdr_stream *, struct nfs_entry *, int);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156typedef struct {
157 struct file *file;
158 struct page *page;
Al Viro23db8622013-05-17 16:34:50 -0400159 struct dir_context *ctx;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160 unsigned long page_index;
Trond Myklebustf0dd2132005-06-22 17:16:29 +0000161 u64 *dir_cookie;
Trond Myklebust0aded702010-11-30 21:56:32 -0500162 u64 last_cookie;
Trond Myklebustf0dd2132005-06-22 17:16:29 +0000163 loff_t current_index;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164 decode_dirent_t decode;
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400165
Neil Brown1f4eab72007-04-16 09:35:27 +1000166 unsigned long timestamp;
Trond Myklebust4704f0e2008-10-14 19:16:07 -0400167 unsigned long gencount;
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400168 unsigned int cache_entry_index;
169 unsigned int plus:1;
170 unsigned int eof:1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171} nfs_readdir_descriptor_t;
172
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400173/*
174 * The caller is responsible for calling nfs_readdir_release_array(page)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175 */
176static
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400177struct nfs_cache_array *nfs_readdir_get_array(struct page *page)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178{
Trond Myklebust8cd51a02010-11-15 20:26:22 -0500179 void *ptr;
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400180 if (page == NULL)
181 return ERR_PTR(-EIO);
Trond Myklebust8cd51a02010-11-15 20:26:22 -0500182 ptr = kmap(page);
183 if (ptr == NULL)
184 return ERR_PTR(-ENOMEM);
185 return ptr;
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400186}
187
188static
189void nfs_readdir_release_array(struct page *page)
190{
191 kunmap(page);
192}
193
194/*
195 * we are freeing strings created by nfs_add_to_readdir_array()
196 */
197static
Trond Myklebust11de3b12010-12-01 14:17:06 -0500198void nfs_readdir_clear_array(struct page *page)
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400199{
Trond Myklebust11de3b12010-12-01 14:17:06 -0500200 struct nfs_cache_array *array;
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400201 int i;
Trond Myklebust8cd51a02010-11-15 20:26:22 -0500202
Cong Wang2b86ce22011-11-25 23:14:33 +0800203 array = kmap_atomic(page);
Al Viro9ac3d3e2016-04-28 19:52:56 -0400204 if (atomic_dec_and_test(&array->refcount))
205 for (i = 0; i < array->size; i++)
206 kfree(array->array[i].string.name);
Cong Wang2b86ce22011-11-25 23:14:33 +0800207 kunmap_atomic(array);
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400208}
209
Al Viro9ac3d3e2016-04-28 19:52:56 -0400210static bool grab_page(struct page *page)
211{
212 struct nfs_cache_array *array = kmap_atomic(page);
213 bool res = atomic_inc_not_zero(&array->refcount);
214 kunmap_atomic(array);
215 return res;
216}
217
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400218/*
219 * the caller is responsible for freeing qstr.name
220 * when called by nfs_readdir_add_to_array, the strings will be freed in
221 * nfs_clear_readdir_array()
222 */
223static
Trond Myklebust4a201d62010-10-23 14:53:23 -0400224int nfs_readdir_make_qstr(struct qstr *string, const char *name, unsigned int len)
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400225{
226 string->len = len;
227 string->name = kmemdup(name, len, GFP_KERNEL);
Trond Myklebust4a201d62010-10-23 14:53:23 -0400228 if (string->name == NULL)
229 return -ENOMEM;
Catalin Marinas04e4bd12010-11-11 12:53:47 +0000230 /*
231 * Avoid a kmemleak false positive. The pointer to the name is stored
232 * in a page cache page which kmemleak does not scan.
233 */
234 kmemleak_not_leak(string->name);
Linus Torvalds8387ff22016-06-10 07:51:30 -0700235 string->hash = full_name_hash(NULL, name, len);
Trond Myklebust4a201d62010-10-23 14:53:23 -0400236 return 0;
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400237}
238
239static
240int nfs_readdir_add_to_array(struct nfs_entry *entry, struct page *page)
241{
242 struct nfs_cache_array *array = nfs_readdir_get_array(page);
Trond Myklebust4a201d62010-10-23 14:53:23 -0400243 struct nfs_cache_array_entry *cache_entry;
244 int ret;
245
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400246 if (IS_ERR(array))
247 return PTR_ERR(array);
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400248
Trond Myklebust4a201d62010-10-23 14:53:23 -0400249 cache_entry = &array->array[array->size];
Trond Myklebust3020093f2010-11-20 15:18:22 -0500250
251 /* Check that this entry lies within the page bounds */
252 ret = -ENOSPC;
253 if ((char *)&cache_entry[1] - (char *)page_address(page) > PAGE_SIZE)
254 goto out;
255
Trond Myklebust4a201d62010-10-23 14:53:23 -0400256 cache_entry->cookie = entry->prev_cookie;
257 cache_entry->ino = entry->ino;
Trond Myklebust0b26a0b2010-11-20 14:26:44 -0500258 cache_entry->d_type = entry->d_type;
Trond Myklebust4a201d62010-10-23 14:53:23 -0400259 ret = nfs_readdir_make_qstr(&cache_entry->string, entry->name, entry->len);
260 if (ret)
261 goto out;
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400262 array->last_cookie = entry->cookie;
Trond Myklebust8cd51a02010-11-15 20:26:22 -0500263 array->size++;
Trond Myklebust47c716c2010-12-07 12:44:56 -0500264 if (entry->eof != 0)
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400265 array->eof_index = array->size;
Trond Myklebust4a201d62010-10-23 14:53:23 -0400266out:
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400267 nfs_readdir_release_array(page);
Trond Myklebust4a201d62010-10-23 14:53:23 -0400268 return ret;
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400269}
270
271static
272int nfs_readdir_search_for_pos(struct nfs_cache_array *array, nfs_readdir_descriptor_t *desc)
273{
Al Viro23db8622013-05-17 16:34:50 -0400274 loff_t diff = desc->ctx->pos - desc->current_index;
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400275 unsigned int index;
276
277 if (diff < 0)
278 goto out_eof;
279 if (diff >= array->size) {
Trond Myklebust8cd51a02010-11-15 20:26:22 -0500280 if (array->eof_index >= 0)
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400281 goto out_eof;
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400282 return -EAGAIN;
283 }
284
285 index = (unsigned int)diff;
286 *desc->dir_cookie = array->array[index].cookie;
287 desc->cache_entry_index = index;
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400288 return 0;
289out_eof:
290 desc->eof = 1;
291 return -EBADCOOKIE;
292}
293
Jeff Layton4db72b42014-01-28 13:47:46 -0500294static bool
295nfs_readdir_inode_mapping_valid(struct nfs_inode *nfsi)
296{
297 if (nfsi->cache_validity & (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA))
298 return false;
299 smp_rmb();
300 return !test_bit(NFS_INO_INVALIDATING, &nfsi->flags);
301}
302
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400303static
304int nfs_readdir_search_for_cookie(struct nfs_cache_array *array, nfs_readdir_descriptor_t *desc)
305{
306 int i;
Bryan Schumaker8ef2ce32011-03-23 15:04:31 -0400307 loff_t new_pos;
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400308 int status = -EAGAIN;
309
310 for (i = 0; i < array->size; i++) {
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400311 if (array->array[i].cookie == *desc->dir_cookie) {
Al Viro496ad9a2013-01-23 17:07:38 -0500312 struct nfs_inode *nfsi = NFS_I(file_inode(desc->file));
Trond Myklebust0c030802011-07-30 12:45:35 -0400313 struct nfs_open_dir_context *ctx = desc->file->private_data;
314
Bryan Schumaker8ef2ce32011-03-23 15:04:31 -0400315 new_pos = desc->current_index + i;
Jeff Layton4db72b42014-01-28 13:47:46 -0500316 if (ctx->attr_gencount != nfsi->attr_gencount ||
317 !nfs_readdir_inode_mapping_valid(nfsi)) {
Trond Myklebust0c030802011-07-30 12:45:35 -0400318 ctx->duped = 0;
319 ctx->attr_gencount = nfsi->attr_gencount;
Al Viro23db8622013-05-17 16:34:50 -0400320 } else if (new_pos < desc->ctx->pos) {
Trond Myklebust0c030802011-07-30 12:45:35 -0400321 if (ctx->duped > 0
322 && ctx->dup_cookie == *desc->dir_cookie) {
323 if (printk_ratelimit()) {
Al Viro6de14722013-09-16 10:53:17 -0400324 pr_notice("NFS: directory %pD2 contains a readdir loop."
Trond Myklebust0c030802011-07-30 12:45:35 -0400325 "Please contact your server vendor. "
Jeff Layton9581a4a2014-04-05 08:45:57 -0400326 "The file: %.*s has duplicate cookie %llu\n",
327 desc->file, array->array[i].string.len,
328 array->array[i].string.name, *desc->dir_cookie);
Trond Myklebust0c030802011-07-30 12:45:35 -0400329 }
330 status = -ELOOP;
331 goto out;
332 }
Bryan Schumaker8ef2ce32011-03-23 15:04:31 -0400333 ctx->dup_cookie = *desc->dir_cookie;
Trond Myklebust0c030802011-07-30 12:45:35 -0400334 ctx->duped = -1;
Bryan Schumaker8ef2ce32011-03-23 15:04:31 -0400335 }
Al Viro23db8622013-05-17 16:34:50 -0400336 desc->ctx->pos = new_pos;
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400337 desc->cache_entry_index = i;
Trond Myklebust47c716c2010-12-07 12:44:56 -0500338 return 0;
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400339 }
340 }
Trond Myklebust47c716c2010-12-07 12:44:56 -0500341 if (array->eof_index >= 0) {
Trond Myklebust8cd51a02010-11-15 20:26:22 -0500342 status = -EBADCOOKIE;
Trond Myklebust18fb5fe2010-12-07 12:41:58 -0500343 if (*desc->dir_cookie == array->last_cookie)
344 desc->eof = 1;
Trond Myklebust8cd51a02010-11-15 20:26:22 -0500345 }
Trond Myklebust0c030802011-07-30 12:45:35 -0400346out:
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400347 return status;
348}
349
350static
351int nfs_readdir_search_array(nfs_readdir_descriptor_t *desc)
352{
353 struct nfs_cache_array *array;
Trond Myklebust47c716c2010-12-07 12:44:56 -0500354 int status;
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400355
356 array = nfs_readdir_get_array(desc->page);
357 if (IS_ERR(array)) {
358 status = PTR_ERR(array);
359 goto out;
360 }
361
362 if (*desc->dir_cookie == 0)
363 status = nfs_readdir_search_for_pos(array, desc);
364 else
365 status = nfs_readdir_search_for_cookie(array, desc);
366
Trond Myklebust47c716c2010-12-07 12:44:56 -0500367 if (status == -EAGAIN) {
Trond Myklebust0aded702010-11-30 21:56:32 -0500368 desc->last_cookie = array->last_cookie;
Trond Myklebuste47c0852011-03-23 08:43:09 -0400369 desc->current_index += array->size;
Trond Myklebust47c716c2010-12-07 12:44:56 -0500370 desc->page_index++;
371 }
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400372 nfs_readdir_release_array(desc->page);
373out:
374 return status;
375}
376
377/* Fill a page with xdr information before transferring to the cache page */
378static
Bryan Schumaker56e4ebf2010-10-20 15:44:37 -0400379int nfs_readdir_xdr_filler(struct page **pages, nfs_readdir_descriptor_t *desc,
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400380 struct nfs_entry *entry, struct file *file, struct inode *inode)
381{
Bryan Schumaker480c2002011-03-23 14:48:29 -0400382 struct nfs_open_dir_context *ctx = file->private_data;
383 struct rpc_cred *cred = ctx->cred;
Trond Myklebust4704f0e2008-10-14 19:16:07 -0400384 unsigned long timestamp, gencount;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385 int error;
386
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387 again:
388 timestamp = jiffies;
Trond Myklebust4704f0e2008-10-14 19:16:07 -0400389 gencount = nfs_inc_attr_generation_counter();
Miklos Szeredibe62a1a2016-03-26 16:14:39 -0400390 error = NFS_PROTO(inode)->readdir(file_dentry(file), cred, entry->cookie, pages,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391 NFS_SERVER(inode)->dtsize, desc->plus);
392 if (error < 0) {
393 /* We requested READDIRPLUS, but the server doesn't grok it */
394 if (error == -ENOTSUPP && desc->plus) {
395 NFS_SERVER(inode)->caps &= ~NFS_CAP_READDIRPLUS;
Benny Halevy3a10c302008-01-23 08:58:59 +0200396 clear_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(inode)->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397 desc->plus = 0;
398 goto again;
399 }
400 goto error;
401 }
Neil Brown1f4eab72007-04-16 09:35:27 +1000402 desc->timestamp = timestamp;
Trond Myklebust4704f0e2008-10-14 19:16:07 -0400403 desc->gencount = gencount;
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400404error:
405 return error;
406}
407
Chuck Lever573c4e12010-12-14 14:58:11 +0000408static int xdr_decode(nfs_readdir_descriptor_t *desc,
409 struct nfs_entry *entry, struct xdr_stream *xdr)
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400410{
Chuck Lever573c4e12010-12-14 14:58:11 +0000411 int error;
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400412
Chuck Lever573c4e12010-12-14 14:58:11 +0000413 error = desc->decode(xdr, entry, desc->plus);
414 if (error)
415 return error;
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400416 entry->fattr->time_start = desc->timestamp;
417 entry->fattr->gencount = desc->gencount;
418 return 0;
419}
420
Trond Myklebustfa9233692015-02-23 18:51:32 -0500421/* Match file and dirent using either filehandle or fileid
422 * Note: caller is responsible for checking the fsid
423 */
Bryan Schumakerd39ab9d2010-09-24 18:50:01 -0400424static
425int nfs_same_file(struct dentry *dentry, struct nfs_entry *entry)
426{
Trond Myklebustd8fdb472016-06-17 16:48:27 -0400427 struct inode *inode;
Trond Myklebustfa9233692015-02-23 18:51:32 -0500428 struct nfs_inode *nfsi;
429
David Howells2b0143b2015-03-17 22:25:59 +0000430 if (d_really_is_negative(dentry))
431 return 0;
Trond Myklebustfa9233692015-02-23 18:51:32 -0500432
Trond Myklebustd8fdb472016-06-17 16:48:27 -0400433 inode = d_inode(dentry);
434 if (is_bad_inode(inode) || NFS_STALE(inode))
435 return 0;
436
437 nfsi = NFS_I(inode);
Trond Myklebust7dc72d52016-09-22 13:38:52 -0400438 if (entry->fattr->fileid != nfsi->fileid)
439 return 0;
440 if (entry->fh->size && nfs_compare_fh(entry->fh, &nfsi->fh) != 0)
441 return 0;
442 return 1;
Bryan Schumakerd39ab9d2010-09-24 18:50:01 -0400443}
444
445static
Al Viro23db8622013-05-17 16:34:50 -0400446bool nfs_use_readdirplus(struct inode *dir, struct dir_context *ctx)
Trond Myklebustd69ee9b2012-05-01 17:37:59 -0400447{
448 if (!nfs_server_capable(dir, NFS_CAP_READDIRPLUS))
449 return false;
450 if (test_and_clear_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(dir)->flags))
451 return true;
Al Viro23db8622013-05-17 16:34:50 -0400452 if (ctx->pos == 0)
Trond Myklebustd69ee9b2012-05-01 17:37:59 -0400453 return true;
454 return false;
455}
456
457/*
458 * This function is called by the lookup code to request the use of
459 * readdirplus to accelerate any future lookups in the same
460 * directory.
461 */
462static
463void nfs_advise_use_readdirplus(struct inode *dir)
464{
465 set_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(dir)->flags);
466}
467
Trond Myklebust311324a2014-02-07 17:02:08 -0500468/*
469 * This function is mainly for use by nfs_getattr().
470 *
471 * If this is an 'ls -l', we want to force use of readdirplus.
472 * Do this by checking if there is an active file descriptor
473 * and calling nfs_advise_use_readdirplus, then forcing a
474 * cache flush.
475 */
476void nfs_force_use_readdirplus(struct inode *dir)
477{
478 if (!list_empty(&NFS_I(dir)->open_files)) {
479 nfs_advise_use_readdirplus(dir);
Trond Myklebuste331f2f2016-11-19 10:54:55 -0500480 invalidate_mapping_pages(dir->i_mapping, 0, -1);
Trond Myklebust311324a2014-02-07 17:02:08 -0500481 }
482}
483
Trond Myklebustd69ee9b2012-05-01 17:37:59 -0400484static
Bryan Schumakerd39ab9d2010-09-24 18:50:01 -0400485void nfs_prime_dcache(struct dentry *parent, struct nfs_entry *entry)
486{
Linus Torvalds26fe5752012-05-10 13:14:12 -0700487 struct qstr filename = QSTR_INIT(entry->name, entry->len);
Al Viro9ac3d3e2016-04-28 19:52:56 -0400488 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq);
Trond Myklebust4a201d62010-10-23 14:53:23 -0400489 struct dentry *dentry;
490 struct dentry *alias;
David Howells2b0143b2015-03-17 22:25:59 +0000491 struct inode *dir = d_inode(parent);
Bryan Schumakerd39ab9d2010-09-24 18:50:01 -0400492 struct inode *inode;
David Quigleyaa9c2662013-05-22 12:50:44 -0400493 int status;
Bryan Schumakerd39ab9d2010-09-24 18:50:01 -0400494
Trond Myklebustfa9233692015-02-23 18:51:32 -0500495 if (!(entry->fattr->valid & NFS_ATTR_FATTR_FILEID))
496 return;
Trond Myklebust6c441c22015-02-22 16:35:36 -0500497 if (!(entry->fattr->valid & NFS_ATTR_FATTR_FSID))
498 return;
Trond Myklebust78d04af2016-09-20 14:34:24 -0400499 if (filename.len == 0)
500 return;
501 /* Validate that the name doesn't contain any illegal '\0' */
502 if (strnlen(filename.name, filename.len) != filename.len)
503 return;
504 /* ...or '/' */
505 if (strnchr(filename.name, filename.len, '/'))
506 return;
Trond Myklebust4a201d62010-10-23 14:53:23 -0400507 if (filename.name[0] == '.') {
508 if (filename.len == 1)
509 return;
510 if (filename.len == 2 && filename.name[1] == '.')
511 return;
512 }
Linus Torvalds8387ff22016-06-10 07:51:30 -0700513 filename.hash = full_name_hash(parent, filename.name, filename.len);
Bryan Schumakerd39ab9d2010-09-24 18:50:01 -0400514
Trond Myklebust4a201d62010-10-23 14:53:23 -0400515 dentry = d_lookup(parent, &filename);
Al Viro9ac3d3e2016-04-28 19:52:56 -0400516again:
517 if (!dentry) {
518 dentry = d_alloc_parallel(parent, &filename, &wq);
519 if (IS_ERR(dentry))
520 return;
521 }
522 if (!d_in_lookup(dentry)) {
Trond Myklebust6c441c22015-02-22 16:35:36 -0500523 /* Is there a mountpoint here? If so, just exit */
524 if (!nfs_fsid_equal(&NFS_SB(dentry->d_sb)->fsid,
525 &entry->fattr->fsid))
526 goto out;
Bryan Schumakerd39ab9d2010-09-24 18:50:01 -0400527 if (nfs_same_file(dentry, entry)) {
Trond Myklebust7dc72d52016-09-22 13:38:52 -0400528 if (!entry->fh->size)
529 goto out;
Jeff Laytoncda57a12013-07-04 06:35:23 -0400530 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
David Howells2b0143b2015-03-17 22:25:59 +0000531 status = nfs_refresh_inode(d_inode(dentry), entry->fattr);
David Quigleyaa9c2662013-05-22 12:50:44 -0400532 if (!status)
David Howells2b0143b2015-03-17 22:25:59 +0000533 nfs_setsecurity(d_inode(dentry), entry->fattr, entry->label);
Bryan Schumakerd39ab9d2010-09-24 18:50:01 -0400534 goto out;
535 } else {
Eric W. Biederman5542aa22014-02-13 09:46:25 -0800536 d_invalidate(dentry);
Bryan Schumakerd39ab9d2010-09-24 18:50:01 -0400537 dput(dentry);
Al Viro9ac3d3e2016-04-28 19:52:56 -0400538 dentry = NULL;
539 goto again;
Bryan Schumakerd39ab9d2010-09-24 18:50:01 -0400540 }
541 }
Trond Myklebust7dc72d52016-09-22 13:38:52 -0400542 if (!entry->fh->size) {
543 d_lookup_done(dentry);
544 goto out;
545 }
Bryan Schumakerd39ab9d2010-09-24 18:50:01 -0400546
David Quigley1775fd32013-05-22 12:50:42 -0400547 inode = nfs_fhget(dentry->d_sb, entry->fh, entry->fattr, entry->label);
Al Viro41d28bc2014-10-12 22:24:21 -0400548 alias = d_splice_alias(inode, dentry);
Al Viro9ac3d3e2016-04-28 19:52:56 -0400549 d_lookup_done(dentry);
550 if (alias) {
551 if (IS_ERR(alias))
552 goto out;
553 dput(dentry);
554 dentry = alias;
555 }
556 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
Bryan Schumakerd39ab9d2010-09-24 18:50:01 -0400557out:
558 dput(dentry);
Bryan Schumakerd39ab9d2010-09-24 18:50:01 -0400559}
560
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400561/* Perform conversion from xdr to cache array */
562static
Trond Myklebust8cd51a02010-11-15 20:26:22 -0500563int nfs_readdir_page_filler(nfs_readdir_descriptor_t *desc, struct nfs_entry *entry,
Trond Myklebust66502392011-01-08 17:45:38 -0500564 struct page **xdr_pages, struct page *page, unsigned int buflen)
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400565{
Bryan Schumakerbabddc72010-10-20 15:44:29 -0400566 struct xdr_stream stream;
Benny Halevyf7da7a12011-05-19 14:16:47 -0400567 struct xdr_buf buf;
Trond Myklebust66502392011-01-08 17:45:38 -0500568 struct page *scratch;
Bryan Schumaker99424382010-10-21 16:33:16 -0400569 struct nfs_cache_array *array;
Trond Myklebust5c346852010-11-20 12:43:45 -0500570 unsigned int count = 0;
571 int status;
Bryan Schumakerbabddc72010-10-20 15:44:29 -0400572
Trond Myklebust66502392011-01-08 17:45:38 -0500573 scratch = alloc_page(GFP_KERNEL);
574 if (scratch == NULL)
575 return -ENOMEM;
Bryan Schumakerbabddc72010-10-20 15:44:29 -0400576
Benjamin Coddingtonce85cfb2015-04-21 14:17:35 -0400577 if (buflen == 0)
578 goto out_nopages;
579
Benny Halevyf7da7a12011-05-19 14:16:47 -0400580 xdr_init_decode_pages(&stream, &buf, xdr_pages, buflen);
Trond Myklebust66502392011-01-08 17:45:38 -0500581 xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE);
Bryan Schumaker99424382010-10-21 16:33:16 -0400582
583 do {
584 status = xdr_decode(desc, entry, &stream);
Trond Myklebust8cd51a02010-11-15 20:26:22 -0500585 if (status != 0) {
586 if (status == -EAGAIN)
587 status = 0;
Bryan Schumaker99424382010-10-21 16:33:16 -0400588 break;
Trond Myklebust8cd51a02010-11-15 20:26:22 -0500589 }
Bryan Schumaker99424382010-10-21 16:33:16 -0400590
Trond Myklebust5c346852010-11-20 12:43:45 -0500591 count++;
592
Trond Myklebust47c716c2010-12-07 12:44:56 -0500593 if (desc->plus != 0)
Miklos Szeredibe62a1a2016-03-26 16:14:39 -0400594 nfs_prime_dcache(file_dentry(desc->file), entry);
Trond Myklebust8cd51a02010-11-15 20:26:22 -0500595
596 status = nfs_readdir_add_to_array(entry, page);
597 if (status != 0)
598 break;
Bryan Schumaker99424382010-10-21 16:33:16 -0400599 } while (!entry->eof);
600
Benjamin Coddingtonce85cfb2015-04-21 14:17:35 -0400601out_nopages:
Trond Myklebust47c716c2010-12-07 12:44:56 -0500602 if (count == 0 || (status == -EBADCOOKIE && entry->eof != 0)) {
Bryan Schumaker99424382010-10-21 16:33:16 -0400603 array = nfs_readdir_get_array(page);
Trond Myklebust8cd51a02010-11-15 20:26:22 -0500604 if (!IS_ERR(array)) {
605 array->eof_index = array->size;
606 status = 0;
607 nfs_readdir_release_array(page);
Trond Myklebust5c346852010-11-20 12:43:45 -0500608 } else
609 status = PTR_ERR(array);
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400610 }
Trond Myklebust66502392011-01-08 17:45:38 -0500611
612 put_page(scratch);
Trond Myklebust8cd51a02010-11-15 20:26:22 -0500613 return status;
Bryan Schumaker56e4ebf2010-10-20 15:44:37 -0400614}
615
616static
Anna Schumakerc7e96682015-07-13 14:01:25 -0400617void nfs_readdir_free_pages(struct page **pages, unsigned int npages)
Bryan Schumaker56e4ebf2010-10-20 15:44:37 -0400618{
619 unsigned int i;
620 for (i = 0; i < npages; i++)
621 put_page(pages[i]);
622}
623
Bryan Schumaker56e4ebf2010-10-20 15:44:37 -0400624/*
625 * nfs_readdir_large_page will allocate pages that must be freed with a call
Anna Schumaker0b936e32015-07-13 14:01:24 -0400626 * to nfs_readdir_free_pagearray
Bryan Schumaker56e4ebf2010-10-20 15:44:37 -0400627 */
628static
Anna Schumakerc7e96682015-07-13 14:01:25 -0400629int nfs_readdir_alloc_pages(struct page **pages, unsigned int npages)
Bryan Schumaker56e4ebf2010-10-20 15:44:37 -0400630{
Bryan Schumaker56e4ebf2010-10-20 15:44:37 -0400631 unsigned int i;
632
633 for (i = 0; i < npages; i++) {
634 struct page *page = alloc_page(GFP_KERNEL);
635 if (page == NULL)
636 goto out_freepages;
637 pages[i] = page;
638 }
Trond Myklebust66502392011-01-08 17:45:38 -0500639 return 0;
Bryan Schumaker56e4ebf2010-10-20 15:44:37 -0400640
Bryan Schumaker56e4ebf2010-10-20 15:44:37 -0400641out_freepages:
Anna Schumakerc7e96682015-07-13 14:01:25 -0400642 nfs_readdir_free_pages(pages, i);
Trond Myklebust66502392011-01-08 17:45:38 -0500643 return -ENOMEM;
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400644}
645
646static
647int nfs_readdir_xdr_to_array(nfs_readdir_descriptor_t *desc, struct page *page, struct inode *inode)
648{
Bryan Schumaker56e4ebf2010-10-20 15:44:37 -0400649 struct page *pages[NFS_MAX_READDIR_PAGES];
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400650 struct nfs_entry entry;
651 struct file *file = desc->file;
652 struct nfs_cache_array *array;
Trond Myklebust8cd51a02010-11-15 20:26:22 -0500653 int status = -ENOMEM;
Bryan Schumaker56e4ebf2010-10-20 15:44:37 -0400654 unsigned int array_size = ARRAY_SIZE(pages);
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400655
656 entry.prev_cookie = 0;
Trond Myklebust0aded702010-11-30 21:56:32 -0500657 entry.cookie = desc->last_cookie;
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400658 entry.eof = 0;
659 entry.fh = nfs_alloc_fhandle();
660 entry.fattr = nfs_alloc_fattr();
Chuck Lever573c4e12010-12-14 14:58:11 +0000661 entry.server = NFS_SERVER(inode);
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400662 if (entry.fh == NULL || entry.fattr == NULL)
663 goto out;
664
David Quigley14c43f72013-05-22 12:50:43 -0400665 entry.label = nfs4_label_alloc(NFS_SERVER(inode), GFP_NOWAIT);
666 if (IS_ERR(entry.label)) {
667 status = PTR_ERR(entry.label);
668 goto out;
669 }
670
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400671 array = nfs_readdir_get_array(page);
Trond Myklebust8cd51a02010-11-15 20:26:22 -0500672 if (IS_ERR(array)) {
673 status = PTR_ERR(array);
David Quigley14c43f72013-05-22 12:50:43 -0400674 goto out_label_free;
Trond Myklebust8cd51a02010-11-15 20:26:22 -0500675 }
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400676 memset(array, 0, sizeof(struct nfs_cache_array));
Al Viro9ac3d3e2016-04-28 19:52:56 -0400677 atomic_set(&array->refcount, 1);
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400678 array->eof_index = -1;
679
Anna Schumakerc7e96682015-07-13 14:01:25 -0400680 status = nfs_readdir_alloc_pages(pages, array_size);
Trond Myklebust66502392011-01-08 17:45:38 -0500681 if (status < 0)
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400682 goto out_release_array;
683 do {
Trond Myklebustac396122010-11-15 20:26:22 -0500684 unsigned int pglen;
Bryan Schumaker56e4ebf2010-10-20 15:44:37 -0400685 status = nfs_readdir_xdr_filler(pages, desc, &entry, file, inode);
Bryan Schumakerbabddc72010-10-20 15:44:29 -0400686
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400687 if (status < 0)
688 break;
Trond Myklebustac396122010-11-15 20:26:22 -0500689 pglen = status;
Trond Myklebust66502392011-01-08 17:45:38 -0500690 status = nfs_readdir_page_filler(desc, &entry, pages, page, pglen);
Trond Myklebust8cd51a02010-11-15 20:26:22 -0500691 if (status < 0) {
692 if (status == -ENOSPC)
693 status = 0;
694 break;
695 }
696 } while (array->eof_index < 0);
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400697
Anna Schumakerc7e96682015-07-13 14:01:25 -0400698 nfs_readdir_free_pages(pages, array_size);
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400699out_release_array:
700 nfs_readdir_release_array(page);
David Quigley14c43f72013-05-22 12:50:43 -0400701out_label_free:
702 nfs4_label_free(entry.label);
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400703out:
704 nfs_free_fattr(entry.fattr);
705 nfs_free_fhandle(entry.fh);
706 return status;
707}
708
709/*
710 * Now we cache directories properly, by converting xdr information
711 * to an array that can be used for lookups later. This results in
712 * fewer cache pages, since we can store more information on each page.
713 * We only need to convert from xdr once so future lookups are much simpler
714 */
715static
716int nfs_readdir_filler(nfs_readdir_descriptor_t *desc, struct page* page)
717{
Al Viro496ad9a2013-01-23 17:07:38 -0500718 struct inode *inode = file_inode(desc->file);
Trond Myklebust8cd51a02010-11-15 20:26:22 -0500719 int ret;
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400720
Trond Myklebust8cd51a02010-11-15 20:26:22 -0500721 ret = nfs_readdir_xdr_to_array(desc, page, inode);
722 if (ret < 0)
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400723 goto error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700724 SetPageUptodate(page);
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400725
Trond Myklebust2aac05a2008-07-07 13:26:10 -0400726 if (invalidate_inode_pages2_range(inode->i_mapping, page->index + 1, -1) < 0) {
Trond Myklebustcd9ae2b2006-10-19 23:28:40 -0700727 /* Should never happen */
728 nfs_zap_mapping(inode, inode->i_mapping);
729 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700730 unlock_page(page);
731 return 0;
732 error:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700733 unlock_page(page);
Trond Myklebust8cd51a02010-11-15 20:26:22 -0500734 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700735}
736
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400737static
738void cache_page_release(nfs_readdir_descriptor_t *desc)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700739{
Al Viro9ac3d3e2016-04-28 19:52:56 -0400740 nfs_readdir_clear_array(desc->page);
Kirill A. Shutemov09cbfea2016-04-01 15:29:47 +0300741 put_page(desc->page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700742 desc->page = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700743}
744
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400745static
746struct page *get_cache_page(nfs_readdir_descriptor_t *desc)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700747{
Al Viro9ac3d3e2016-04-28 19:52:56 -0400748 struct page *page;
749
750 for (;;) {
Al Viro93c76a32015-12-04 23:45:44 -0500751 page = read_cache_page(desc->file->f_mapping,
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400752 desc->page_index, (filler_t *)nfs_readdir_filler, desc);
Al Viro9ac3d3e2016-04-28 19:52:56 -0400753 if (IS_ERR(page) || grab_page(page))
754 break;
755 put_page(page);
756 }
757 return page;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700758}
759
760/*
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400761 * Returns 0 if desc->dir_cookie was found on page desc->page_index
Olivier Galibert00a92642005-06-22 17:16:29 +0000762 */
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400763static
764int find_cache_page(nfs_readdir_descriptor_t *desc)
Olivier Galibert00a92642005-06-22 17:16:29 +0000765{
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400766 int res;
Olivier Galibert00a92642005-06-22 17:16:29 +0000767
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400768 desc->page = get_cache_page(desc);
769 if (IS_ERR(desc->page))
770 return PTR_ERR(desc->page);
Olivier Galibert00a92642005-06-22 17:16:29 +0000771
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400772 res = nfs_readdir_search_array(desc);
Trond Myklebust47c716c2010-12-07 12:44:56 -0500773 if (res != 0)
774 cache_page_release(desc);
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400775 return res;
Olivier Galibert00a92642005-06-22 17:16:29 +0000776}
777
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400778/* Search for desc->dir_cookie from the beginning of the page cache */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700779static inline
780int readdir_search_pagecache(nfs_readdir_descriptor_t *desc)
781{
Trond Myklebust8cd51a02010-11-15 20:26:22 -0500782 int res;
Olivier Galibert00a92642005-06-22 17:16:29 +0000783
Trond Myklebust0aded702010-11-30 21:56:32 -0500784 if (desc->page_index == 0) {
Trond Myklebust8cd51a02010-11-15 20:26:22 -0500785 desc->current_index = 0;
Trond Myklebust0aded702010-11-30 21:56:32 -0500786 desc->last_cookie = 0;
787 }
Trond Myklebust47c716c2010-12-07 12:44:56 -0500788 do {
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400789 res = find_cache_page(desc);
Trond Myklebust47c716c2010-12-07 12:44:56 -0500790 } while (res == -EAGAIN);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700791 return res;
792}
793
Linus Torvalds1da177e2005-04-16 15:20:36 -0700794/*
795 * Once we've found the start of the dirent within a page: fill 'er up...
796 */
797static
Al Viro23db8622013-05-17 16:34:50 -0400798int nfs_do_filldir(nfs_readdir_descriptor_t *desc)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700799{
800 struct file *file = desc->file;
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400801 int i = 0;
802 int res = 0;
803 struct nfs_cache_array *array = NULL;
Bryan Schumaker8ef2ce32011-03-23 15:04:31 -0400804 struct nfs_open_dir_context *ctx = file->private_data;
805
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400806 array = nfs_readdir_get_array(desc->page);
Trond Myklebuste7c58e92010-11-20 13:22:24 -0500807 if (IS_ERR(array)) {
808 res = PTR_ERR(array);
809 goto out;
810 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700811
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400812 for (i = desc->cache_entry_index; i < array->size; i++) {
Trond Myklebustece0b422010-11-20 13:55:33 -0500813 struct nfs_cache_array_entry *ent;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700814
Trond Myklebustece0b422010-11-20 13:55:33 -0500815 ent = &array->array[i];
Al Viro23db8622013-05-17 16:34:50 -0400816 if (!dir_emit(desc->ctx, ent->string.name, ent->string.len,
817 nfs_compat_user_ino64(ent->ino), ent->d_type)) {
Trond Myklebustece0b422010-11-20 13:55:33 -0500818 desc->eof = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700819 break;
Trond Myklebustece0b422010-11-20 13:55:33 -0500820 }
Al Viro23db8622013-05-17 16:34:50 -0400821 desc->ctx->pos++;
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400822 if (i < (array->size-1))
823 *desc->dir_cookie = array->array[i+1].cookie;
824 else
825 *desc->dir_cookie = array->last_cookie;
Trond Myklebust0c030802011-07-30 12:45:35 -0400826 if (ctx->duped != 0)
827 ctx->duped = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700828 }
Trond Myklebust47c716c2010-12-07 12:44:56 -0500829 if (array->eof_index >= 0)
Trond Myklebust8cd51a02010-11-15 20:26:22 -0500830 desc->eof = 1;
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400831
832 nfs_readdir_release_array(desc->page);
Trond Myklebuste7c58e92010-11-20 13:22:24 -0500833out:
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400834 cache_page_release(desc);
Chuck Lever1e7cb3d2006-03-20 13:44:24 -0500835 dfprintk(DIRCACHE, "NFS: nfs_do_filldir() filling ended @ cookie %Lu; returning = %d\n",
836 (unsigned long long)*desc->dir_cookie, res);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700837 return res;
838}
839
840/*
841 * If we cannot find a cookie in our cache, we suspect that this is
842 * because it points to a deleted file, so we ask the server to return
843 * whatever it thinks is the next entry. We then feed this to filldir.
844 * If all goes well, we should then be able to find our way round the
845 * cache on the next call to readdir_search_pagecache();
846 *
847 * NOTE: we cannot add the anonymous page to the pagecache because
848 * the data it contains might not be page aligned. Besides,
849 * we should already have a complete representation of the
850 * directory in the page cache by the time we get here.
851 */
852static inline
Al Viro23db8622013-05-17 16:34:50 -0400853int uncached_readdir(nfs_readdir_descriptor_t *desc)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700854{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700855 struct page *page = NULL;
856 int status;
Al Viro496ad9a2013-01-23 17:07:38 -0500857 struct inode *inode = file_inode(desc->file);
Trond Myklebust0c030802011-07-30 12:45:35 -0400858 struct nfs_open_dir_context *ctx = desc->file->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700859
Chuck Lever1e7cb3d2006-03-20 13:44:24 -0500860 dfprintk(DIRCACHE, "NFS: uncached_readdir() searching for cookie %Lu\n",
861 (unsigned long long)*desc->dir_cookie);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700862
863 page = alloc_page(GFP_HIGHUSER);
864 if (!page) {
865 status = -ENOMEM;
866 goto out;
867 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700868
Trond Myklebust7a8e1dc2010-11-20 13:24:46 -0500869 desc->page_index = 0;
Trond Myklebust0aded702010-11-30 21:56:32 -0500870 desc->last_cookie = *desc->dir_cookie;
Trond Myklebust7a8e1dc2010-11-20 13:24:46 -0500871 desc->page = page;
Trond Myklebust0c030802011-07-30 12:45:35 -0400872 ctx->duped = 0;
Trond Myklebust7a8e1dc2010-11-20 13:24:46 -0500873
Trond Myklebust85f86072010-11-20 13:24:49 -0500874 status = nfs_readdir_xdr_to_array(desc, page, inode);
875 if (status < 0)
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400876 goto out_release;
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400877
Al Viro23db8622013-05-17 16:34:50 -0400878 status = nfs_do_filldir(desc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700879
Linus Torvalds1da177e2005-04-16 15:20:36 -0700880 out:
Chuck Lever1e7cb3d2006-03-20 13:44:24 -0500881 dfprintk(DIRCACHE, "NFS: %s: returns %d\n",
Harvey Harrison3110ff82008-05-02 13:42:44 -0700882 __func__, status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700883 return status;
884 out_release:
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400885 cache_page_release(desc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700886 goto out;
887}
888
Olivier Galibert00a92642005-06-22 17:16:29 +0000889/* The file offset position represents the dirent entry number. A
890 last cookie cache takes care of the common case of reading the
891 whole directory.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700892 */
Al Viro23db8622013-05-17 16:34:50 -0400893static int nfs_readdir(struct file *file, struct dir_context *ctx)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700894{
Miklos Szeredibe62a1a2016-03-26 16:14:39 -0400895 struct dentry *dentry = file_dentry(file);
David Howells2b0143b2015-03-17 22:25:59 +0000896 struct inode *inode = d_inode(dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700897 nfs_readdir_descriptor_t my_desc,
898 *desc = &my_desc;
Al Viro23db8622013-05-17 16:34:50 -0400899 struct nfs_open_dir_context *dir_ctx = file->private_data;
Scott Mayhew07b5ce82013-07-05 17:49:31 -0400900 int res = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700901
Al Viro6de14722013-09-16 10:53:17 -0400902 dfprintk(FILE, "NFS: readdir(%pD2) starting at cookie %llu\n",
903 file, (long long)ctx->pos);
Chuck Lever91d5b472006-03-20 13:44:14 -0500904 nfs_inc_stats(inode, NFSIOS_VFSGETDENTS);
905
Linus Torvalds1da177e2005-04-16 15:20:36 -0700906 /*
Al Viro23db8622013-05-17 16:34:50 -0400907 * ctx->pos points to the dirent entry number.
Trond Myklebustf0dd2132005-06-22 17:16:29 +0000908 * *desc->dir_cookie has the cookie for the next entry. We have
Olivier Galibert00a92642005-06-22 17:16:29 +0000909 * to either find the entry with the appropriate number or
910 * revalidate the cookie.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700911 */
912 memset(desc, 0, sizeof(*desc));
913
Al Viro23db8622013-05-17 16:34:50 -0400914 desc->file = file;
915 desc->ctx = ctx;
Bryan Schumaker480c2002011-03-23 14:48:29 -0400916 desc->dir_cookie = &dir_ctx->dir_cookie;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700917 desc->decode = NFS_PROTO(inode)->decode_dirent;
Al Viro23db8622013-05-17 16:34:50 -0400918 desc->plus = nfs_use_readdirplus(inode, ctx) ? 1 : 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700919
Trond Myklebuste331f2f2016-11-19 10:54:55 -0500920 if (ctx->pos == 0 || nfs_attribute_cache_expired(inode))
Scott Mayhew07b5ce82013-07-05 17:49:31 -0400921 res = nfs_revalidate_mapping(inode, file->f_mapping);
Trond Myklebustfccca7f2008-01-26 17:37:47 -0500922 if (res < 0)
923 goto out;
924
Trond Myklebust47c716c2010-12-07 12:44:56 -0500925 do {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700926 res = readdir_search_pagecache(desc);
Olivier Galibert00a92642005-06-22 17:16:29 +0000927
Linus Torvalds1da177e2005-04-16 15:20:36 -0700928 if (res == -EBADCOOKIE) {
Trond Myklebustece0b422010-11-20 13:55:33 -0500929 res = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700930 /* This means either end of directory */
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400931 if (*desc->dir_cookie && desc->eof == 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700932 /* Or that the server has 'lost' a cookie */
Al Viro23db8622013-05-17 16:34:50 -0400933 res = uncached_readdir(desc);
Trond Myklebustece0b422010-11-20 13:55:33 -0500934 if (res == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700935 continue;
936 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700937 break;
938 }
939 if (res == -ETOOSMALL && desc->plus) {
Benny Halevy3a10c302008-01-23 08:58:59 +0200940 clear_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(inode)->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700941 nfs_zap_caches(inode);
Trond Myklebustbaf57a02010-09-24 18:49:43 -0400942 desc->page_index = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700943 desc->plus = 0;
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400944 desc->eof = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700945 continue;
946 }
947 if (res < 0)
948 break;
949
Al Viro23db8622013-05-17 16:34:50 -0400950 res = nfs_do_filldir(desc);
Trond Myklebustece0b422010-11-20 13:55:33 -0500951 if (res < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700952 break;
Trond Myklebust47c716c2010-12-07 12:44:56 -0500953 } while (!desc->eof);
Trond Myklebustfccca7f2008-01-26 17:37:47 -0500954out:
Chuck Lever1e7cb3d2006-03-20 13:44:24 -0500955 if (res > 0)
956 res = 0;
Al Viro6de14722013-09-16 10:53:17 -0400957 dfprintk(FILE, "NFS: readdir(%pD2) returns %d\n", file, res);
Chuck Lever1e7cb3d2006-03-20 13:44:24 -0500958 return res;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700959}
960
Andrew Morton965c8e52012-12-17 15:59:39 -0800961static loff_t nfs_llseek_dir(struct file *filp, loff_t offset, int whence)
Trond Myklebustf0dd2132005-06-22 17:16:29 +0000962{
Bryan Schumaker480c2002011-03-23 14:48:29 -0400963 struct nfs_open_dir_context *dir_ctx = filp->private_data;
Chuck Leverb84e06c2008-06-11 17:55:34 -0400964
Al Viro6de14722013-09-16 10:53:17 -0400965 dfprintk(FILE, "NFS: llseek dir(%pD2, %lld, %d)\n",
966 filp, offset, whence);
Chuck Leverb84e06c2008-06-11 17:55:34 -0400967
Andrew Morton965c8e52012-12-17 15:59:39 -0800968 switch (whence) {
Trond Myklebustf0dd2132005-06-22 17:16:29 +0000969 case 1:
970 offset += filp->f_pos;
971 case 0:
972 if (offset >= 0)
973 break;
974 default:
Al Viro9ac3d3e2016-04-28 19:52:56 -0400975 return -EINVAL;
Trond Myklebustf0dd2132005-06-22 17:16:29 +0000976 }
977 if (offset != filp->f_pos) {
978 filp->f_pos = offset;
Bryan Schumaker480c2002011-03-23 14:48:29 -0400979 dir_ctx->dir_cookie = 0;
Bryan Schumaker8ef2ce32011-03-23 15:04:31 -0400980 dir_ctx->duped = 0;
Trond Myklebustf0dd2132005-06-22 17:16:29 +0000981 }
Trond Myklebustf0dd2132005-06-22 17:16:29 +0000982 return offset;
983}
984
Linus Torvalds1da177e2005-04-16 15:20:36 -0700985/*
986 * All directory operations under NFS are synchronous, so fsync()
987 * is a dummy operation.
988 */
Josef Bacik02c24a82011-07-16 20:44:56 -0400989static int nfs_fsync_dir(struct file *filp, loff_t start, loff_t end,
990 int datasync)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700991{
Al Viro6de14722013-09-16 10:53:17 -0400992 struct inode *inode = file_inode(filp);
Christoph Hellwig7ea80852010-05-26 17:53:25 +0200993
Al Viro6de14722013-09-16 10:53:17 -0400994 dfprintk(FILE, "NFS: fsync dir(%pD2) datasync %d\n", filp, datasync);
Chuck Lever1e7cb3d2006-03-20 13:44:24 -0500995
Al Viro59551022016-01-22 15:40:57 -0500996 inode_lock(inode);
Al Viro6de14722013-09-16 10:53:17 -0400997 nfs_inc_stats(inode, NFSIOS_VFSFSYNC);
Al Viro59551022016-01-22 15:40:57 -0500998 inode_unlock(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700999 return 0;
1000}
1001
Trond Myklebustbfc69a42007-10-15 18:18:29 -04001002/**
1003 * nfs_force_lookup_revalidate - Mark the directory as having changed
1004 * @dir - pointer to directory inode
1005 *
1006 * This forces the revalidation code in nfs_lookup_revalidate() to do a
1007 * full lookup on all child dentries of 'dir' whenever a change occurs
1008 * on the server that might have invalidated our dcache.
1009 *
1010 * The caller should be holding dir->i_lock
1011 */
1012void nfs_force_lookup_revalidate(struct inode *dir)
1013{
Trond Myklebust011935a2008-10-14 19:24:50 -04001014 NFS_I(dir)->cache_change_attribute++;
Trond Myklebustbfc69a42007-10-15 18:18:29 -04001015}
Bryan Schumaker89d77c82012-07-30 16:05:25 -04001016EXPORT_SYMBOL_GPL(nfs_force_lookup_revalidate);
Trond Myklebustbfc69a42007-10-15 18:18:29 -04001017
Linus Torvalds1da177e2005-04-16 15:20:36 -07001018/*
1019 * A check for whether or not the parent directory has changed.
1020 * In the case it has, we assume that the dentries are untrustworthy
1021 * and may need to be looked up again.
NeilBrown912a1082014-07-14 11:28:20 +10001022 * If rcu_walk prevents us from performing a full check, return 0.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001023 */
NeilBrown912a1082014-07-14 11:28:20 +10001024static int nfs_check_verifier(struct inode *dir, struct dentry *dentry,
1025 int rcu_walk)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001026{
NeilBrown912a1082014-07-14 11:28:20 +10001027 int ret;
1028
Linus Torvalds1da177e2005-04-16 15:20:36 -07001029 if (IS_ROOT(dentry))
1030 return 1;
Trond Myklebust4eec9522008-07-15 17:58:13 -04001031 if (NFS_SERVER(dir)->flags & NFS_MOUNT_LOOKUP_CACHE_NONE)
1032 return 0;
Trond Myklebustf2c77f42007-10-02 12:54:39 -04001033 if (!nfs_verify_change_attribute(dir, dentry->d_time))
1034 return 0;
1035 /* Revalidate nfsi->cache_change_attribute before we declare a match */
NeilBrown912a1082014-07-14 11:28:20 +10001036 if (rcu_walk)
1037 ret = nfs_revalidate_inode_rcu(NFS_SERVER(dir), dir);
1038 else
1039 ret = nfs_revalidate_inode(NFS_SERVER(dir), dir);
1040 if (ret < 0)
Trond Myklebustf2c77f42007-10-02 12:54:39 -04001041 return 0;
1042 if (!nfs_verify_change_attribute(dir, dentry->d_time))
1043 return 0;
1044 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001045}
1046
Linus Torvalds1da177e2005-04-16 15:20:36 -07001047/*
Trond Myklebusta12802c2007-10-02 19:13:04 -04001048 * Use intent information to check whether or not we're going to do
1049 * an O_EXCL create using this path component.
1050 */
Al Virofa3c56b2012-06-10 15:36:40 -04001051static int nfs_is_exclusive_create(struct inode *dir, unsigned int flags)
Trond Myklebusta12802c2007-10-02 19:13:04 -04001052{
1053 if (NFS_PROTO(dir)->version == 2)
1054 return 0;
Al Virofa3c56b2012-06-10 15:36:40 -04001055 return flags & LOOKUP_EXCL;
Trond Myklebusta12802c2007-10-02 19:13:04 -04001056}
1057
1058/*
Trond Myklebust1d6757f2005-06-07 18:37:01 -04001059 * Inode and filehandle revalidation for lookups.
1060 *
1061 * We force revalidation in the cases where the VFS sets LOOKUP_REVAL,
1062 * or if the intent information indicates that we're about to open this
1063 * particular file and the "nocto" mount flag is not set.
1064 *
1065 */
Trond Myklebust65a0c142012-12-14 17:51:40 -05001066static
Al Virofa3c56b2012-06-10 15:36:40 -04001067int nfs_lookup_verify_inode(struct inode *inode, unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001068{
1069 struct nfs_server *server = NFS_SERVER(inode);
Trond Myklebust65a0c142012-12-14 17:51:40 -05001070 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001071
David Howells36d43a42011-01-14 18:45:42 +00001072 if (IS_AUTOMOUNT(inode))
Trond Myklebust4e99a1f2008-03-06 12:34:59 -05001073 return 0;
Al Virofacc3532012-06-10 15:33:51 -04001074 /* VFS wants an on-the-wire revalidation */
Al Virofa3c56b2012-06-10 15:36:40 -04001075 if (flags & LOOKUP_REVAL)
Al Virofacc3532012-06-10 15:33:51 -04001076 goto out_force;
1077 /* This is an open(2) */
Al Virofa3c56b2012-06-10 15:36:40 -04001078 if ((flags & LOOKUP_OPEN) && !(server->flags & NFS_MOUNT_NOCTO) &&
1079 (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)))
Al Virofacc3532012-06-10 15:33:51 -04001080 goto out_force;
Trond Myklebust65a0c142012-12-14 17:51:40 -05001081out:
1082 return (inode->i_nlink == 0) ? -ENOENT : 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001083out_force:
NeilBrown1fa1e382014-07-14 11:28:20 +10001084 if (flags & LOOKUP_RCU)
1085 return -ECHILD;
Trond Myklebust65a0c142012-12-14 17:51:40 -05001086 ret = __nfs_revalidate_inode(server, inode);
1087 if (ret != 0)
1088 return ret;
1089 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001090}
1091
1092/*
1093 * We judge how long we want to trust negative
1094 * dentries by looking at the parent inode mtime.
1095 *
1096 * If parent mtime has changed, we revalidate, else we wait for a
1097 * period corresponding to the parent's attribute cache timeout value.
NeilBrown912a1082014-07-14 11:28:20 +10001098 *
1099 * If LOOKUP_RCU prevents us from performing a full check, return 1
1100 * suggesting a reval is needed.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001101 */
1102static inline
1103int nfs_neg_need_reval(struct inode *dir, struct dentry *dentry,
Al Virofa3c56b2012-06-10 15:36:40 -04001104 unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001105{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001106 /* Don't revalidate a negative dentry if we're creating a new file */
Al Virofa3c56b2012-06-10 15:36:40 -04001107 if (flags & LOOKUP_CREATE)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001108 return 0;
Trond Myklebust4eec9522008-07-15 17:58:13 -04001109 if (NFS_SERVER(dir)->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG)
1110 return 1;
NeilBrown912a1082014-07-14 11:28:20 +10001111 return !nfs_check_verifier(dir, dentry, flags & LOOKUP_RCU);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001112}
1113
1114/*
1115 * This is called every time the dcache has a lookup hit,
1116 * and we should check whether we can really trust that
1117 * lookup.
1118 *
1119 * NOTE! The hit can be a negative hit too, don't assume
1120 * we have an inode!
1121 *
1122 * If the parent directory is seen to have changed, we throw out the
1123 * cached dentry and do a new lookup.
1124 */
Al Viro0b728e12012-06-10 16:03:43 -04001125static int nfs_lookup_revalidate(struct dentry *dentry, unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001126{
1127 struct inode *dir;
1128 struct inode *inode;
1129 struct dentry *parent;
Trond Myklebuste1fb4d02010-04-16 16:22:47 -04001130 struct nfs_fh *fhandle = NULL;
1131 struct nfs_fattr *fattr = NULL;
David Quigley1775fd32013-05-22 12:50:42 -04001132 struct nfs4_label *label = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001133 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001134
NeilBrownd51ac1a2014-07-14 11:28:20 +10001135 if (flags & LOOKUP_RCU) {
NeilBrown50d77732014-08-04 16:24:00 +10001136 parent = ACCESS_ONCE(dentry->d_parent);
David Howells2b0143b2015-03-17 22:25:59 +00001137 dir = d_inode_rcu(parent);
NeilBrownd51ac1a2014-07-14 11:28:20 +10001138 if (!dir)
1139 return -ECHILD;
1140 } else {
1141 parent = dget_parent(dentry);
David Howells2b0143b2015-03-17 22:25:59 +00001142 dir = d_inode(parent);
NeilBrownd51ac1a2014-07-14 11:28:20 +10001143 }
Chuck Lever91d5b472006-03-20 13:44:14 -05001144 nfs_inc_stats(dir, NFSIOS_DENTRYREVALIDATE);
David Howells2b0143b2015-03-17 22:25:59 +00001145 inode = d_inode(dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001146
1147 if (!inode) {
NeilBrown912a1082014-07-14 11:28:20 +10001148 if (nfs_neg_need_reval(dir, dentry, flags)) {
1149 if (flags & LOOKUP_RCU)
1150 return -ECHILD;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001151 goto out_bad;
NeilBrown912a1082014-07-14 11:28:20 +10001152 }
Trond Myklebustd69ee9b2012-05-01 17:37:59 -04001153 goto out_valid_noent;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001154 }
1155
1156 if (is_bad_inode(inode)) {
NeilBrownd51ac1a2014-07-14 11:28:20 +10001157 if (flags & LOOKUP_RCU)
1158 return -ECHILD;
Al Viro6de14722013-09-16 10:53:17 -04001159 dfprintk(LOOKUPCACHE, "%s: %pd2 has dud inode\n",
1160 __func__, dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001161 goto out_bad;
1162 }
1163
Bryan Schumaker011e2a72012-06-20 15:53:43 -04001164 if (NFS_PROTO(dir)->have_delegation(inode, FMODE_READ))
Trond Myklebust15860ab2008-12-23 15:21:54 -05001165 goto out_set_verifier;
1166
Linus Torvalds1da177e2005-04-16 15:20:36 -07001167 /* Force a full look up iff the parent directory has changed */
NeilBrown912a1082014-07-14 11:28:20 +10001168 if (!nfs_is_exclusive_create(dir, flags) &&
1169 nfs_check_verifier(dir, dentry, flags & LOOKUP_RCU)) {
1170
NeilBrown1fa1e382014-07-14 11:28:20 +10001171 if (nfs_lookup_verify_inode(inode, flags)) {
1172 if (flags & LOOKUP_RCU)
1173 return -ECHILD;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001174 goto out_zap_parent;
NeilBrown1fa1e382014-07-14 11:28:20 +10001175 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001176 goto out_valid;
1177 }
1178
NeilBrown912a1082014-07-14 11:28:20 +10001179 if (flags & LOOKUP_RCU)
1180 return -ECHILD;
1181
Linus Torvalds1da177e2005-04-16 15:20:36 -07001182 if (NFS_STALE(inode))
1183 goto out_bad;
1184
Trond Myklebuste1fb4d02010-04-16 16:22:47 -04001185 error = -ENOMEM;
1186 fhandle = nfs_alloc_fhandle();
1187 fattr = nfs_alloc_fattr();
1188 if (fhandle == NULL || fattr == NULL)
1189 goto out_error;
1190
David Quigley14c43f72013-05-22 12:50:43 -04001191 label = nfs4_label_alloc(NFS_SERVER(inode), GFP_NOWAIT);
1192 if (IS_ERR(label))
1193 goto out_error;
1194
Trond Myklebust6e0d0be2013-08-20 11:26:17 -04001195 trace_nfs_lookup_revalidate_enter(dir, dentry, flags);
David Quigley1775fd32013-05-22 12:50:42 -04001196 error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, fhandle, fattr, label);
Trond Myklebust6e0d0be2013-08-20 11:26:17 -04001197 trace_nfs_lookup_revalidate_exit(dir, dentry, flags, error);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001198 if (error)
1199 goto out_bad;
Trond Myklebuste1fb4d02010-04-16 16:22:47 -04001200 if (nfs_compare_fh(NFS_FH(inode), fhandle))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001201 goto out_bad;
Trond Myklebuste1fb4d02010-04-16 16:22:47 -04001202 if ((error = nfs_refresh_inode(inode, fattr)) != 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001203 goto out_bad;
1204
David Quigleyaa9c2662013-05-22 12:50:44 -04001205 nfs_setsecurity(inode, fattr, label);
1206
Trond Myklebuste1fb4d02010-04-16 16:22:47 -04001207 nfs_free_fattr(fattr);
1208 nfs_free_fhandle(fhandle);
David Quigley14c43f72013-05-22 12:50:43 -04001209 nfs4_label_free(label);
1210
Trond Myklebust15860ab2008-12-23 15:21:54 -05001211out_set_verifier:
Trond Myklebustcf8ba452007-10-01 13:46:53 -04001212 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001213 out_valid:
Trond Myklebustd69ee9b2012-05-01 17:37:59 -04001214 /* Success: notify readdir to use READDIRPLUS */
1215 nfs_advise_use_readdirplus(dir);
1216 out_valid_noent:
NeilBrownd51ac1a2014-07-14 11:28:20 +10001217 if (flags & LOOKUP_RCU) {
NeilBrown50d77732014-08-04 16:24:00 +10001218 if (parent != ACCESS_ONCE(dentry->d_parent))
NeilBrownd51ac1a2014-07-14 11:28:20 +10001219 return -ECHILD;
1220 } else
1221 dput(parent);
Al Viro6de14722013-09-16 10:53:17 -04001222 dfprintk(LOOKUPCACHE, "NFS: %s(%pd2) is valid\n",
1223 __func__, dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001224 return 1;
1225out_zap_parent:
1226 nfs_zap_caches(dir);
1227 out_bad:
NeilBrownd51ac1a2014-07-14 11:28:20 +10001228 WARN_ON(flags & LOOKUP_RCU);
Al Viroc44600c2012-11-29 22:04:36 -05001229 nfs_free_fattr(fattr);
1230 nfs_free_fhandle(fhandle);
David Quigley14c43f72013-05-22 12:50:43 -04001231 nfs4_label_free(label);
Trond Myklebusta1643a92007-09-29 17:25:43 -04001232 nfs_mark_for_revalidate(dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001233 if (inode && S_ISDIR(inode->i_mode)) {
1234 /* Purge readdir caches. */
1235 nfs_zap_caches(inode);
J. Bruce Fieldsa3f432b2013-10-15 17:03:16 -04001236 /*
1237 * We can't d_drop the root of a disconnected tree:
1238 * its d_hash is on the s_anon list and d_drop() would hide
1239 * it from shrink_dcache_for_unmount(), leading to busy
1240 * inodes on unmount and further oopses.
1241 */
1242 if (IS_ROOT(dentry))
Al Virod9e80b72010-04-29 03:10:43 +01001243 goto out_valid;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001244 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001245 dput(parent);
Al Viro6de14722013-09-16 10:53:17 -04001246 dfprintk(LOOKUPCACHE, "NFS: %s(%pd2) is invalid\n",
1247 __func__, dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001248 return 0;
Trond Myklebuste1fb4d02010-04-16 16:22:47 -04001249out_error:
NeilBrownd51ac1a2014-07-14 11:28:20 +10001250 WARN_ON(flags & LOOKUP_RCU);
Trond Myklebuste1fb4d02010-04-16 16:22:47 -04001251 nfs_free_fattr(fattr);
1252 nfs_free_fhandle(fhandle);
David Quigley14c43f72013-05-22 12:50:43 -04001253 nfs4_label_free(label);
Trond Myklebuste1fb4d02010-04-16 16:22:47 -04001254 dput(parent);
Al Viro6de14722013-09-16 10:53:17 -04001255 dfprintk(LOOKUPCACHE, "NFS: %s(%pd2) lookup returned error %d\n",
1256 __func__, dentry, error);
Trond Myklebuste1fb4d02010-04-16 16:22:47 -04001257 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001258}
1259
1260/*
David Howells2b0143b2015-03-17 22:25:59 +00001261 * A weaker form of d_revalidate for revalidating just the d_inode(dentry)
Jeff Laytonecf3d1f2013-02-20 11:19:05 -05001262 * when we don't really care about the dentry name. This is called when a
1263 * pathwalk ends on a dentry that was not found via a normal lookup in the
1264 * parent dir (e.g.: ".", "..", procfs symlinks or mountpoint traversals).
1265 *
1266 * In this situation, we just want to verify that the inode itself is OK
1267 * since the dentry might have changed on the server.
1268 */
1269static int nfs_weak_revalidate(struct dentry *dentry, unsigned int flags)
1270{
1271 int error;
David Howells2b0143b2015-03-17 22:25:59 +00001272 struct inode *inode = d_inode(dentry);
Jeff Laytonecf3d1f2013-02-20 11:19:05 -05001273
1274 /*
1275 * I believe we can only get a negative dentry here in the case of a
1276 * procfs-style symlink. Just assume it's correct for now, but we may
1277 * eventually need to do something more here.
1278 */
1279 if (!inode) {
Al Viro6de14722013-09-16 10:53:17 -04001280 dfprintk(LOOKUPCACHE, "%s: %pd2 has negative inode\n",
1281 __func__, dentry);
Jeff Laytonecf3d1f2013-02-20 11:19:05 -05001282 return 1;
1283 }
1284
1285 if (is_bad_inode(inode)) {
Al Viro6de14722013-09-16 10:53:17 -04001286 dfprintk(LOOKUPCACHE, "%s: %pd2 has dud inode\n",
1287 __func__, dentry);
Jeff Laytonecf3d1f2013-02-20 11:19:05 -05001288 return 0;
1289 }
1290
1291 error = nfs_revalidate_inode(NFS_SERVER(inode), inode);
1292 dfprintk(LOOKUPCACHE, "NFS: %s: inode %lu is %s\n",
1293 __func__, inode->i_ino, error ? "invalid" : "valid");
1294 return !error;
1295}
1296
1297/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001298 * This is called from dput() when d_count is going to 0.
1299 */
Nick Pigginfe15ce42011-01-07 17:49:23 +11001300static int nfs_dentry_delete(const struct dentry *dentry)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001301{
Al Viro6de14722013-09-16 10:53:17 -04001302 dfprintk(VFS, "NFS: dentry_delete(%pd2, %x)\n",
1303 dentry, dentry->d_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001304
Trond Myklebust77f11192008-01-28 19:43:19 -05001305 /* Unhash any dentry with a stale inode */
David Howells2b0143b2015-03-17 22:25:59 +00001306 if (d_really_is_positive(dentry) && NFS_STALE(d_inode(dentry)))
Trond Myklebust77f11192008-01-28 19:43:19 -05001307 return 1;
1308
Linus Torvalds1da177e2005-04-16 15:20:36 -07001309 if (dentry->d_flags & DCACHE_NFSFS_RENAMED) {
1310 /* Unhash it, so that ->d_iput() would be called */
1311 return 1;
1312 }
1313 if (!(dentry->d_sb->s_flags & MS_ACTIVE)) {
1314 /* Unhash it, so that ancestors of killed async unlink
1315 * files will be cleaned up during umount */
1316 return 1;
1317 }
1318 return 0;
1319
1320}
1321
Trond Myklebust1f018452012-12-14 16:38:46 -05001322/* Ensure that we revalidate inode->i_nlink */
Trond Myklebust1b83d702008-06-11 15:44:04 -04001323static void nfs_drop_nlink(struct inode *inode)
1324{
1325 spin_lock(&inode->i_lock);
Trond Myklebust1f018452012-12-14 16:38:46 -05001326 /* drop the inode if we're reasonably sure this is the last link */
1327 if (inode->i_nlink == 1)
1328 clear_nlink(inode);
1329 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
Trond Myklebust1b83d702008-06-11 15:44:04 -04001330 spin_unlock(&inode->i_lock);
1331}
1332
Linus Torvalds1da177e2005-04-16 15:20:36 -07001333/*
1334 * Called when the dentry loses inode.
1335 * We use it to clean up silly-renamed files.
1336 */
1337static void nfs_dentry_iput(struct dentry *dentry, struct inode *inode)
1338{
Neil Brown83672d32007-02-26 12:48:25 +11001339 if (S_ISDIR(inode->i_mode))
1340 /* drop any readdir cache as it could easily be old */
1341 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_DATA;
1342
Linus Torvalds1da177e2005-04-16 15:20:36 -07001343 if (dentry->d_flags & DCACHE_NFSFS_RENAMED) {
Trond Myklebuste4eff1a2007-07-14 15:39:58 -04001344 nfs_complete_unlink(dentry, inode);
Trond Myklebust1f018452012-12-14 16:38:46 -05001345 nfs_drop_nlink(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001346 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001347 iput(inode);
1348}
1349
Al Virob1942c52011-03-16 05:44:14 -04001350static void nfs_d_release(struct dentry *dentry)
1351{
1352 /* free cached devname value, if it survived that far */
1353 if (unlikely(dentry->d_fsdata)) {
1354 if (dentry->d_flags & DCACHE_NFSFS_RENAMED)
1355 WARN_ON(1);
1356 else
1357 kfree(dentry->d_fsdata);
1358 }
1359}
1360
Al Virof786aa92009-02-20 05:51:22 +00001361const struct dentry_operations nfs_dentry_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001362 .d_revalidate = nfs_lookup_revalidate,
Jeff Laytonecf3d1f2013-02-20 11:19:05 -05001363 .d_weak_revalidate = nfs_weak_revalidate,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001364 .d_delete = nfs_dentry_delete,
1365 .d_iput = nfs_dentry_iput,
David Howells36d43a42011-01-14 18:45:42 +00001366 .d_automount = nfs_d_automount,
Al Virob1942c52011-03-16 05:44:14 -04001367 .d_release = nfs_d_release,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001368};
Bryan Schumakerddda8e02012-07-30 16:05:23 -04001369EXPORT_SYMBOL_GPL(nfs_dentry_operations);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001370
Bryan Schumaker597d9282012-07-16 16:39:10 -04001371struct dentry *nfs_lookup(struct inode *dir, struct dentry * dentry, unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001372{
1373 struct dentry *res;
1374 struct inode *inode = NULL;
Trond Myklebuste1fb4d02010-04-16 16:22:47 -04001375 struct nfs_fh *fhandle = NULL;
1376 struct nfs_fattr *fattr = NULL;
David Quigley1775fd32013-05-22 12:50:42 -04001377 struct nfs4_label *label = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001378 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001379
Al Viro6de14722013-09-16 10:53:17 -04001380 dfprintk(VFS, "NFS: lookup(%pd2)\n", dentry);
Chuck Lever91d5b472006-03-20 13:44:14 -05001381 nfs_inc_stats(dir, NFSIOS_VFSLOOKUP);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001382
Al Viro130f9ab2016-03-07 22:40:43 -05001383 if (unlikely(dentry->d_name.len > NFS_SERVER(dir)->namelen))
1384 return ERR_PTR(-ENAMETOOLONG);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001385
Trond Myklebustfd684072006-09-05 12:27:44 -04001386 /*
1387 * If we're doing an exclusive create, optimize away the lookup
1388 * but don't hash the dentry.
1389 */
Al Viro130f9ab2016-03-07 22:40:43 -05001390 if (nfs_is_exclusive_create(dir, flags))
1391 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001392
Trond Myklebuste1fb4d02010-04-16 16:22:47 -04001393 res = ERR_PTR(-ENOMEM);
1394 fhandle = nfs_alloc_fhandle();
1395 fattr = nfs_alloc_fattr();
1396 if (fhandle == NULL || fattr == NULL)
1397 goto out;
1398
David Quigley14c43f72013-05-22 12:50:43 -04001399 label = nfs4_label_alloc(NFS_SERVER(dir), GFP_NOWAIT);
1400 if (IS_ERR(label))
1401 goto out;
1402
Trond Myklebust6e0d0be2013-08-20 11:26:17 -04001403 trace_nfs_lookup_enter(dir, dentry, flags);
David Quigley1775fd32013-05-22 12:50:42 -04001404 error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, fhandle, fattr, label);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001405 if (error == -ENOENT)
1406 goto no_entry;
1407 if (error < 0) {
1408 res = ERR_PTR(error);
Al Virobf130912016-05-29 15:14:14 -04001409 goto out_label;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001410 }
David Quigley1775fd32013-05-22 12:50:42 -04001411 inode = nfs_fhget(dentry->d_sb, fhandle, fattr, label);
Namhyung Kimbf0c84f2010-12-28 17:02:46 +00001412 res = ERR_CAST(inode);
Trond Myklebust03f28e32006-03-20 13:44:48 -05001413 if (IS_ERR(res))
Al Virobf130912016-05-29 15:14:14 -04001414 goto out_label;
David Howells54ceac42006-08-22 20:06:13 -04001415
Trond Myklebustd69ee9b2012-05-01 17:37:59 -04001416 /* Success: notify readdir to use READDIRPLUS */
1417 nfs_advise_use_readdirplus(dir);
1418
Linus Torvalds1da177e2005-04-16 15:20:36 -07001419no_entry:
Al Viro41d28bc2014-10-12 22:24:21 -04001420 res = d_splice_alias(inode, dentry);
Trond Myklebust9eaef272006-10-21 10:24:20 -07001421 if (res != NULL) {
1422 if (IS_ERR(res))
Al Virobf130912016-05-29 15:14:14 -04001423 goto out_label;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001424 dentry = res;
Trond Myklebust9eaef272006-10-21 10:24:20 -07001425 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001426 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
Al Virobf130912016-05-29 15:14:14 -04001427out_label:
Trond Myklebust6e0d0be2013-08-20 11:26:17 -04001428 trace_nfs_lookup_exit(dir, dentry, flags, error);
David Quigley14c43f72013-05-22 12:50:43 -04001429 nfs4_label_free(label);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001430out:
Trond Myklebuste1fb4d02010-04-16 16:22:47 -04001431 nfs_free_fattr(fattr);
1432 nfs_free_fhandle(fhandle);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001433 return res;
1434}
Bryan Schumakerddda8e02012-07-30 16:05:23 -04001435EXPORT_SYMBOL_GPL(nfs_lookup);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001436
Bryan Schumaker89d77c82012-07-30 16:05:25 -04001437#if IS_ENABLED(CONFIG_NFS_V4)
Al Viro0b728e12012-06-10 16:03:43 -04001438static int nfs4_lookup_revalidate(struct dentry *, unsigned int);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001439
Al Virof786aa92009-02-20 05:51:22 +00001440const struct dentry_operations nfs4_dentry_operations = {
Miklos Szeredi0ef97dc2012-05-21 17:30:20 +02001441 .d_revalidate = nfs4_lookup_revalidate,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001442 .d_delete = nfs_dentry_delete,
1443 .d_iput = nfs_dentry_iput,
David Howells36d43a42011-01-14 18:45:42 +00001444 .d_automount = nfs_d_automount,
Al Virob1942c52011-03-16 05:44:14 -04001445 .d_release = nfs_d_release,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001446};
Bryan Schumaker89d77c82012-07-30 16:05:25 -04001447EXPORT_SYMBOL_GPL(nfs4_dentry_operations);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001448
Al Viro8a5e9292011-06-25 19:15:54 -04001449static fmode_t flags_to_mode(int flags)
1450{
1451 fmode_t res = (__force fmode_t)flags & FMODE_EXEC;
1452 if ((flags & O_ACCMODE) != O_WRONLY)
1453 res |= FMODE_READ;
1454 if ((flags & O_ACCMODE) != O_RDONLY)
1455 res |= FMODE_WRITE;
1456 return res;
1457}
1458
Al Viro51141592011-06-22 18:47:28 -04001459static struct nfs_open_context *create_nfs_open_context(struct dentry *dentry, int open_flags)
Trond Myklebustcd9a1c02010-09-17 10:56:50 -04001460{
Al Viro5ede7b12011-10-23 18:49:54 -04001461 return alloc_nfs_open_context(dentry, flags_to_mode(open_flags));
Trond Myklebustcd9a1c02010-09-17 10:56:50 -04001462}
1463
1464static int do_open(struct inode *inode, struct file *filp)
1465{
David Howellsf1fe29b2013-09-27 11:20:03 +01001466 nfs_fscache_open_file(inode, filp);
Trond Myklebustcd9a1c02010-09-17 10:56:50 -04001467 return 0;
1468}
1469
Al Virod9585272012-06-22 12:39:14 +04001470static int nfs_finish_open(struct nfs_open_context *ctx,
1471 struct dentry *dentry,
Al Viro30d90492012-06-22 12:40:19 +04001472 struct file *file, unsigned open_flags,
Al Virod9585272012-06-22 12:39:14 +04001473 int *opened)
Trond Myklebustcd9a1c02010-09-17 10:56:50 -04001474{
Miklos Szeredi0dd2b472012-06-05 15:10:18 +02001475 int err;
1476
Al Viro30d90492012-06-22 12:40:19 +04001477 err = finish_open(file, dentry, do_open, opened);
1478 if (err)
Al Virod9585272012-06-22 12:39:14 +04001479 goto out;
Al Viro30d90492012-06-22 12:40:19 +04001480 nfs_file_set_open_context(file, ctx);
Miklos Szeredi0dd2b472012-06-05 15:10:18 +02001481
Trond Myklebustcd9a1c02010-09-17 10:56:50 -04001482out:
Al Virod9585272012-06-22 12:39:14 +04001483 return err;
Trond Myklebustcd9a1c02010-09-17 10:56:50 -04001484}
1485
Bryan Schumaker73a79702012-07-16 16:39:12 -04001486int nfs_atomic_open(struct inode *dir, struct dentry *dentry,
1487 struct file *file, unsigned open_flags,
1488 umode_t mode, int *opened)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001489{
Al Viroc94c0952016-07-05 09:49:21 -04001490 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq);
Trond Myklebustcd9a1c02010-09-17 10:56:50 -04001491 struct nfs_open_context *ctx;
Miklos Szeredi0dd2b472012-06-05 15:10:18 +02001492 struct dentry *res;
1493 struct iattr attr = { .ia_valid = ATTR_OPEN };
Trond Myklebustf46e0bd2010-09-17 10:56:50 -04001494 struct inode *inode;
Trond Myklebust1472b832013-08-20 11:59:41 -04001495 unsigned int lookup_flags = 0;
Al Viroc94c0952016-07-05 09:49:21 -04001496 bool switched = false;
Trond Myklebust898f6352010-10-23 11:24:25 -04001497 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001498
Miklos Szeredi0dd2b472012-06-05 15:10:18 +02001499 /* Expect a negative dentry */
David Howells2b0143b2015-03-17 22:25:59 +00001500 BUG_ON(d_inode(dentry));
Miklos Szeredi0dd2b472012-06-05 15:10:18 +02001501
Niels de Vos1e8968c2013-12-17 18:20:16 +01001502 dfprintk(VFS, "NFS: atomic_open(%s/%lu), %pd\n",
Al Viro6de14722013-09-16 10:53:17 -04001503 dir->i_sb->s_id, dir->i_ino, dentry);
Chuck Lever1e7cb3d2006-03-20 13:44:24 -05001504
Jeff Layton9597c132013-08-02 11:39:32 -04001505 err = nfs_check_flags(open_flags);
1506 if (err)
1507 return err;
1508
Miklos Szeredi0dd2b472012-06-05 15:10:18 +02001509 /* NFS only supports OPEN on regular files */
1510 if ((open_flags & O_DIRECTORY)) {
Al Viro00699ad2016-07-05 09:44:53 -04001511 if (!d_in_lookup(dentry)) {
Miklos Szeredi0dd2b472012-06-05 15:10:18 +02001512 /*
1513 * Hashed negative dentry with O_DIRECTORY: dentry was
1514 * revalidated and is fine, no need to perform lookup
1515 * again
1516 */
Al Virod9585272012-06-22 12:39:14 +04001517 return -ENOENT;
Miklos Szeredi0dd2b472012-06-05 15:10:18 +02001518 }
Trond Myklebust1472b832013-08-20 11:59:41 -04001519 lookup_flags = LOOKUP_OPEN|LOOKUP_DIRECTORY;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001520 goto no_open;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001521 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001522
Miklos Szeredi0dd2b472012-06-05 15:10:18 +02001523 if (dentry->d_name.len > NFS_SERVER(dir)->namelen)
Al Virod9585272012-06-22 12:39:14 +04001524 return -ENAMETOOLONG;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001525
Miklos Szeredi0dd2b472012-06-05 15:10:18 +02001526 if (open_flags & O_CREAT) {
Trond Myklebust536e43d2012-01-17 22:04:26 -05001527 attr.ia_valid |= ATTR_MODE;
Miklos Szeredi0dd2b472012-06-05 15:10:18 +02001528 attr.ia_mode = mode & ~current_umask();
1529 }
Trond Myklebust536e43d2012-01-17 22:04:26 -05001530 if (open_flags & O_TRUNC) {
1531 attr.ia_valid |= ATTR_SIZE;
1532 attr.ia_size = 0;
Trond Myklebustcd9a1c02010-09-17 10:56:50 -04001533 }
1534
Al Viroc94c0952016-07-05 09:49:21 -04001535 if (!(open_flags & O_CREAT) && !d_in_lookup(dentry)) {
1536 d_drop(dentry);
1537 switched = true;
1538 dentry = d_alloc_parallel(dentry->d_parent,
1539 &dentry->d_name, &wq);
1540 if (IS_ERR(dentry))
1541 return PTR_ERR(dentry);
1542 if (unlikely(!d_in_lookup(dentry)))
1543 return finish_no_open(file, dentry);
1544 }
1545
Miklos Szeredi0dd2b472012-06-05 15:10:18 +02001546 ctx = create_nfs_open_context(dentry, open_flags);
1547 err = PTR_ERR(ctx);
1548 if (IS_ERR(ctx))
Al Virod9585272012-06-22 12:39:14 +04001549 goto out;
Miklos Szeredi0dd2b472012-06-05 15:10:18 +02001550
Trond Myklebust6e0d0be2013-08-20 11:26:17 -04001551 trace_nfs_atomic_open_enter(dir, ctx, open_flags);
Trond Myklebust5bc2afc2013-09-23 18:01:28 -04001552 inode = NFS_PROTO(dir)->open_context(dir, ctx, open_flags, &attr, opened);
Trond Myklebustf46e0bd2010-09-17 10:56:50 -04001553 if (IS_ERR(inode)) {
Miklos Szeredi0dd2b472012-06-05 15:10:18 +02001554 err = PTR_ERR(inode);
Trond Myklebust6e0d0be2013-08-20 11:26:17 -04001555 trace_nfs_atomic_open_exit(dir, ctx, open_flags, err);
Trond Myklebust2d9db752013-08-30 09:17:33 -04001556 put_nfs_open_context(ctx);
Al Virod20cb712016-06-20 13:14:36 -04001557 d_drop(dentry);
Miklos Szeredi0dd2b472012-06-05 15:10:18 +02001558 switch (err) {
1559 case -ENOENT:
1560 d_add(dentry, NULL);
Trond Myklebust809fd142014-10-23 19:33:14 +03001561 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
Miklos Szeredi0dd2b472012-06-05 15:10:18 +02001562 break;
1563 case -EISDIR:
1564 case -ENOTDIR:
1565 goto no_open;
1566 case -ELOOP:
1567 if (!(open_flags & O_NOFOLLOW))
Trond Myklebust6f926b52005-10-18 14:20:18 -07001568 goto no_open;
Miklos Szeredi0dd2b472012-06-05 15:10:18 +02001569 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001570 /* case -EINVAL: */
Miklos Szeredi0dd2b472012-06-05 15:10:18 +02001571 default:
1572 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001573 }
Al Virod9585272012-06-22 12:39:14 +04001574 goto out;
Trond Myklebustcd9a1c02010-09-17 10:56:50 -04001575 }
Miklos Szeredi0dd2b472012-06-05 15:10:18 +02001576
Trond Myklebust275bb302013-05-29 13:11:28 -04001577 err = nfs_finish_open(ctx, ctx->dentry, file, open_flags, opened);
Trond Myklebust6e0d0be2013-08-20 11:26:17 -04001578 trace_nfs_atomic_open_exit(dir, ctx, open_flags, err);
Trond Myklebust2d9db752013-08-30 09:17:33 -04001579 put_nfs_open_context(ctx);
Al Virod9585272012-06-22 12:39:14 +04001580out:
Al Viroc94c0952016-07-05 09:49:21 -04001581 if (unlikely(switched)) {
1582 d_lookup_done(dentry);
1583 dput(dentry);
1584 }
Al Virod9585272012-06-22 12:39:14 +04001585 return err;
Miklos Szeredi0dd2b472012-06-05 15:10:18 +02001586
Linus Torvalds1da177e2005-04-16 15:20:36 -07001587no_open:
Trond Myklebust1472b832013-08-20 11:59:41 -04001588 res = nfs_lookup(dir, dentry, lookup_flags);
Al Viroc94c0952016-07-05 09:49:21 -04001589 if (switched) {
1590 d_lookup_done(dentry);
1591 if (!res)
1592 res = dentry;
1593 else
1594 dput(dentry);
1595 }
Miklos Szeredi0dd2b472012-06-05 15:10:18 +02001596 if (IS_ERR(res))
Al Viroc94c0952016-07-05 09:49:21 -04001597 return PTR_ERR(res);
Al Viroe45198a2012-06-10 06:48:09 -04001598 return finish_no_open(file, res);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001599}
Bryan Schumaker89d77c82012-07-30 16:05:25 -04001600EXPORT_SYMBOL_GPL(nfs_atomic_open);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001601
Al Viro0b728e12012-06-10 16:03:43 -04001602static int nfs4_lookup_revalidate(struct dentry *dentry, unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001603{
Nick Piggin657e94b2011-01-14 02:48:39 +00001604 struct inode *inode;
Miklos Szeredi50de3482012-06-05 15:10:20 +02001605 int ret = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001606
Al Virofa3c56b2012-06-10 15:36:40 -04001607 if (!(flags & LOOKUP_OPEN) || (flags & LOOKUP_DIRECTORY))
Miklos Szeredieda72af2012-06-05 15:10:21 +02001608 goto no_open;
1609 if (d_mountpoint(dentry))
Trond Myklebust5584c302008-12-23 15:21:54 -05001610 goto no_open;
Trond Myklebust49f9a0f2013-03-15 16:44:28 -04001611 if (NFS_SB(dentry->d_sb)->caps & NFS_CAP_ATOMIC_OPEN_V1)
1612 goto no_open;
Trond Myklebust2b484292010-09-17 10:56:51 -04001613
David Howells2b0143b2015-03-17 22:25:59 +00001614 inode = d_inode(dentry);
Trond Myklebust2b484292010-09-17 10:56:51 -04001615
Linus Torvalds1da177e2005-04-16 15:20:36 -07001616 /* We can't create new files in nfs_open_revalidate(), so we
1617 * optimize away revalidation of negative dentries.
1618 */
Trond Myklebust216d5d02007-10-01 20:10:12 -04001619 if (inode == NULL) {
NeilBrown49317a72014-07-14 11:28:20 +10001620 struct dentry *parent;
1621 struct inode *dir;
1622
NeilBrown912a1082014-07-14 11:28:20 +10001623 if (flags & LOOKUP_RCU) {
NeilBrown50d77732014-08-04 16:24:00 +10001624 parent = ACCESS_ONCE(dentry->d_parent);
David Howells2b0143b2015-03-17 22:25:59 +00001625 dir = d_inode_rcu(parent);
NeilBrown912a1082014-07-14 11:28:20 +10001626 if (!dir)
1627 return -ECHILD;
1628 } else {
1629 parent = dget_parent(dentry);
David Howells2b0143b2015-03-17 22:25:59 +00001630 dir = d_inode(parent);
NeilBrown912a1082014-07-14 11:28:20 +10001631 }
Al Virofa3c56b2012-06-10 15:36:40 -04001632 if (!nfs_neg_need_reval(dir, dentry, flags))
Trond Myklebust216d5d02007-10-01 20:10:12 -04001633 ret = 1;
NeilBrown912a1082014-07-14 11:28:20 +10001634 else if (flags & LOOKUP_RCU)
1635 ret = -ECHILD;
1636 if (!(flags & LOOKUP_RCU))
1637 dput(parent);
NeilBrown50d77732014-08-04 16:24:00 +10001638 else if (parent != ACCESS_ONCE(dentry->d_parent))
NeilBrown912a1082014-07-14 11:28:20 +10001639 return -ECHILD;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001640 goto out;
Trond Myklebust216d5d02007-10-01 20:10:12 -04001641 }
1642
Linus Torvalds1da177e2005-04-16 15:20:36 -07001643 /* NFS only supports OPEN on regular files */
1644 if (!S_ISREG(inode->i_mode))
NeilBrown49317a72014-07-14 11:28:20 +10001645 goto no_open;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001646 /* We cannot do exclusive creation on a positive dentry */
Al Virofa3c56b2012-06-10 15:36:40 -04001647 if (flags & LOOKUP_EXCL)
NeilBrown49317a72014-07-14 11:28:20 +10001648 goto no_open;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001649
Miklos Szeredi0ef97dc2012-05-21 17:30:20 +02001650 /* Let f_op->open() actually open (and revalidate) the file */
1651 ret = 1;
Trond Myklebust536e43d2012-01-17 22:04:26 -05001652
Linus Torvalds1da177e2005-04-16 15:20:36 -07001653out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001654 return ret;
Trond Myklebust535918f2010-09-17 10:56:51 -04001655
Trond Myklebust5584c302008-12-23 15:21:54 -05001656no_open:
Al Viro0b728e12012-06-10 16:03:43 -04001657 return nfs_lookup_revalidate(dentry, flags);
Trond Myklebustc0204fd2010-09-17 10:56:51 -04001658}
1659
Linus Torvalds1da177e2005-04-16 15:20:36 -07001660#endif /* CONFIG_NFSV4 */
1661
Linus Torvalds1da177e2005-04-16 15:20:36 -07001662/*
1663 * Code common to create, mkdir, and mknod.
1664 */
1665int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fhandle,
David Quigley1775fd32013-05-22 12:50:42 -04001666 struct nfs_fattr *fattr,
1667 struct nfs4_label *label)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001668{
Trond Myklebustfab728e2007-09-29 17:41:33 -04001669 struct dentry *parent = dget_parent(dentry);
David Howells2b0143b2015-03-17 22:25:59 +00001670 struct inode *dir = d_inode(parent);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001671 struct inode *inode;
1672 int error = -EACCES;
1673
Trond Myklebustfab728e2007-09-29 17:41:33 -04001674 d_drop(dentry);
1675
Linus Torvalds1da177e2005-04-16 15:20:36 -07001676 /* We may have been initialized further down */
David Howells2b0143b2015-03-17 22:25:59 +00001677 if (d_really_is_positive(dentry))
Trond Myklebustfab728e2007-09-29 17:41:33 -04001678 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001679 if (fhandle->size == 0) {
David Quigley1775fd32013-05-22 12:50:42 -04001680 error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, fhandle, fattr, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001681 if (error)
Trond Myklebustfab728e2007-09-29 17:41:33 -04001682 goto out_error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001683 }
Trond Myklebust5724ab32007-10-01 21:51:38 -04001684 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001685 if (!(fattr->valid & NFS_ATTR_FATTR)) {
1686 struct nfs_server *server = NFS_SB(dentry->d_sb);
David Quigley1775fd32013-05-22 12:50:42 -04001687 error = server->nfs_client->rpc_ops->getattr(server, fhandle, fattr, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001688 if (error < 0)
Trond Myklebustfab728e2007-09-29 17:41:33 -04001689 goto out_error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001690 }
David Quigley1775fd32013-05-22 12:50:42 -04001691 inode = nfs_fhget(dentry->d_sb, fhandle, fattr, label);
Trond Myklebust03f28e32006-03-20 13:44:48 -05001692 error = PTR_ERR(inode);
1693 if (IS_ERR(inode))
Trond Myklebustfab728e2007-09-29 17:41:33 -04001694 goto out_error;
1695 d_add(dentry, inode);
1696out:
1697 dput(parent);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001698 return 0;
Trond Myklebustfab728e2007-09-29 17:41:33 -04001699out_error:
1700 nfs_mark_for_revalidate(dir);
1701 dput(parent);
1702 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001703}
Bryan Schumakerddda8e02012-07-30 16:05:23 -04001704EXPORT_SYMBOL_GPL(nfs_instantiate);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001705
1706/*
1707 * Following a failed create operation, we drop the dentry rather
1708 * than retain a negative dentry. This avoids a problem in the event
1709 * that the operation succeeded on the server, but an error in the
1710 * reply path made it appear to have failed.
1711 */
Bryan Schumaker597d9282012-07-16 16:39:10 -04001712int nfs_create(struct inode *dir, struct dentry *dentry,
Al Viroebfc3b42012-06-10 18:05:36 -04001713 umode_t mode, bool excl)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001714{
1715 struct iattr attr;
Al Viroebfc3b42012-06-10 18:05:36 -04001716 int open_flags = excl ? O_CREAT | O_EXCL : O_CREAT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001717 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001718
Niels de Vos1e8968c2013-12-17 18:20:16 +01001719 dfprintk(VFS, "NFS: create(%s/%lu), %pd\n",
Al Viro6de14722013-09-16 10:53:17 -04001720 dir->i_sb->s_id, dir->i_ino, dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001721
1722 attr.ia_mode = mode;
1723 attr.ia_valid = ATTR_MODE;
1724
Trond Myklebust8b0ad3d2013-08-21 10:53:09 -04001725 trace_nfs_create_enter(dir, dentry, open_flags);
Miklos Szeredi8867fe52012-06-05 15:10:19 +02001726 error = NFS_PROTO(dir)->create(dir, dentry, &attr, open_flags);
Trond Myklebust8b0ad3d2013-08-21 10:53:09 -04001727 trace_nfs_create_exit(dir, dentry, open_flags, error);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001728 if (error != 0)
1729 goto out_err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001730 return 0;
1731out_err:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001732 d_drop(dentry);
1733 return error;
1734}
Bryan Schumakerddda8e02012-07-30 16:05:23 -04001735EXPORT_SYMBOL_GPL(nfs_create);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001736
1737/*
1738 * See comments for nfs_proc_create regarding failed operations.
1739 */
Bryan Schumaker597d9282012-07-16 16:39:10 -04001740int
Al Viro1a67aaf2011-07-26 01:52:52 -04001741nfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t rdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001742{
1743 struct iattr attr;
1744 int status;
1745
Niels de Vos1e8968c2013-12-17 18:20:16 +01001746 dfprintk(VFS, "NFS: mknod(%s/%lu), %pd\n",
Al Viro6de14722013-09-16 10:53:17 -04001747 dir->i_sb->s_id, dir->i_ino, dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001748
Linus Torvalds1da177e2005-04-16 15:20:36 -07001749 attr.ia_mode = mode;
1750 attr.ia_valid = ATTR_MODE;
1751
Trond Myklebust1ca42382013-08-21 12:36:04 -04001752 trace_nfs_mknod_enter(dir, dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001753 status = NFS_PROTO(dir)->mknod(dir, dentry, &attr, rdev);
Trond Myklebust1ca42382013-08-21 12:36:04 -04001754 trace_nfs_mknod_exit(dir, dentry, status);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001755 if (status != 0)
1756 goto out_err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001757 return 0;
1758out_err:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001759 d_drop(dentry);
1760 return status;
1761}
Bryan Schumakerddda8e02012-07-30 16:05:23 -04001762EXPORT_SYMBOL_GPL(nfs_mknod);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001763
1764/*
1765 * See comments for nfs_proc_create regarding failed operations.
1766 */
Bryan Schumaker597d9282012-07-16 16:39:10 -04001767int nfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001768{
1769 struct iattr attr;
1770 int error;
1771
Niels de Vos1e8968c2013-12-17 18:20:16 +01001772 dfprintk(VFS, "NFS: mkdir(%s/%lu), %pd\n",
Al Viro6de14722013-09-16 10:53:17 -04001773 dir->i_sb->s_id, dir->i_ino, dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001774
1775 attr.ia_valid = ATTR_MODE;
1776 attr.ia_mode = mode | S_IFDIR;
1777
Trond Myklebust1ca42382013-08-21 12:36:04 -04001778 trace_nfs_mkdir_enter(dir, dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001779 error = NFS_PROTO(dir)->mkdir(dir, dentry, &attr);
Trond Myklebust1ca42382013-08-21 12:36:04 -04001780 trace_nfs_mkdir_exit(dir, dentry, error);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001781 if (error != 0)
1782 goto out_err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001783 return 0;
1784out_err:
1785 d_drop(dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001786 return error;
1787}
Bryan Schumakerddda8e02012-07-30 16:05:23 -04001788EXPORT_SYMBOL_GPL(nfs_mkdir);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001789
Trond Myklebustd45b9d82008-01-28 19:43:18 -05001790static void nfs_dentry_handle_enoent(struct dentry *dentry)
1791{
Al Virodc3f4192015-05-18 10:10:34 -04001792 if (simple_positive(dentry))
Trond Myklebustd45b9d82008-01-28 19:43:18 -05001793 d_delete(dentry);
1794}
1795
Bryan Schumaker597d9282012-07-16 16:39:10 -04001796int nfs_rmdir(struct inode *dir, struct dentry *dentry)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001797{
1798 int error;
1799
Niels de Vos1e8968c2013-12-17 18:20:16 +01001800 dfprintk(VFS, "NFS: rmdir(%s/%lu), %pd\n",
Al Viro6de14722013-09-16 10:53:17 -04001801 dir->i_sb->s_id, dir->i_ino, dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001802
Trond Myklebust1ca42382013-08-21 12:36:04 -04001803 trace_nfs_rmdir_enter(dir, dentry);
David Howells2b0143b2015-03-17 22:25:59 +00001804 if (d_really_is_positive(dentry)) {
Al Viro884be172016-04-28 23:56:31 -04001805 down_write(&NFS_I(d_inode(dentry))->rmdir_sem);
Trond Myklebustba6c0592013-08-30 12:24:25 -04001806 error = NFS_PROTO(dir)->rmdir(dir, &dentry->d_name);
1807 /* Ensure the VFS deletes this inode */
1808 switch (error) {
1809 case 0:
David Howells2b0143b2015-03-17 22:25:59 +00001810 clear_nlink(d_inode(dentry));
Trond Myklebustba6c0592013-08-30 12:24:25 -04001811 break;
1812 case -ENOENT:
1813 nfs_dentry_handle_enoent(dentry);
1814 }
Al Viro884be172016-04-28 23:56:31 -04001815 up_write(&NFS_I(d_inode(dentry))->rmdir_sem);
Trond Myklebustba6c0592013-08-30 12:24:25 -04001816 } else
1817 error = NFS_PROTO(dir)->rmdir(dir, &dentry->d_name);
Trond Myklebust1ca42382013-08-21 12:36:04 -04001818 trace_nfs_rmdir_exit(dir, dentry, error);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001819
1820 return error;
1821}
Bryan Schumakerddda8e02012-07-30 16:05:23 -04001822EXPORT_SYMBOL_GPL(nfs_rmdir);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001823
Linus Torvalds1da177e2005-04-16 15:20:36 -07001824/*
1825 * Remove a file after making sure there are no pending writes,
1826 * and after checking that the file has only one user.
1827 *
1828 * We invalidate the attribute cache and free the inode prior to the operation
1829 * to avoid possible races if the server reuses the inode.
1830 */
1831static int nfs_safe_remove(struct dentry *dentry)
1832{
David Howells2b0143b2015-03-17 22:25:59 +00001833 struct inode *dir = d_inode(dentry->d_parent);
1834 struct inode *inode = d_inode(dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001835 int error = -EBUSY;
1836
Al Viro6de14722013-09-16 10:53:17 -04001837 dfprintk(VFS, "NFS: safe_remove(%pd2)\n", dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001838
1839 /* If the dentry was sillyrenamed, we simply call d_delete() */
1840 if (dentry->d_flags & DCACHE_NFSFS_RENAMED) {
1841 error = 0;
1842 goto out;
1843 }
1844
Trond Myklebust1ca42382013-08-21 12:36:04 -04001845 trace_nfs_remove_enter(dir, dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001846 if (inode != NULL) {
Bryan Schumaker57ec14c2012-06-20 15:53:44 -04001847 NFS_PROTO(inode)->return_delegation(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001848 error = NFS_PROTO(dir)->remove(dir, &dentry->d_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001849 if (error == 0)
Trond Myklebust1b83d702008-06-11 15:44:04 -04001850 nfs_drop_nlink(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001851 } else
1852 error = NFS_PROTO(dir)->remove(dir, &dentry->d_name);
Trond Myklebustd45b9d82008-01-28 19:43:18 -05001853 if (error == -ENOENT)
1854 nfs_dentry_handle_enoent(dentry);
Trond Myklebust1ca42382013-08-21 12:36:04 -04001855 trace_nfs_remove_exit(dir, dentry, error);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001856out:
1857 return error;
1858}
1859
1860/* We do silly rename. In case sillyrename() returns -EBUSY, the inode
1861 * belongs to an active ".nfs..." file and we return -EBUSY.
1862 *
1863 * If sillyrename() returns 0, we do nothing, otherwise we unlink.
1864 */
Bryan Schumaker597d9282012-07-16 16:39:10 -04001865int nfs_unlink(struct inode *dir, struct dentry *dentry)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001866{
1867 int error;
1868 int need_rehash = 0;
1869
Niels de Vos1e8968c2013-12-17 18:20:16 +01001870 dfprintk(VFS, "NFS: unlink(%s/%lu, %pd)\n", dir->i_sb->s_id,
Al Viro6de14722013-09-16 10:53:17 -04001871 dir->i_ino, dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001872
Trond Myklebust1ca42382013-08-21 12:36:04 -04001873 trace_nfs_unlink_enter(dir, dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001874 spin_lock(&dentry->d_lock);
Al Viro84d08fa2013-07-05 18:59:33 +04001875 if (d_count(dentry) > 1) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001876 spin_unlock(&dentry->d_lock);
Trond Myklebustccfeb502007-01-13 02:28:12 -05001877 /* Start asynchronous writeout of the inode */
David Howells2b0143b2015-03-17 22:25:59 +00001878 write_inode_now(d_inode(dentry), 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001879 error = nfs_sillyrename(dir, dentry);
Trond Myklebust1ca42382013-08-21 12:36:04 -04001880 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001881 }
1882 if (!d_unhashed(dentry)) {
1883 __d_drop(dentry);
1884 need_rehash = 1;
1885 }
1886 spin_unlock(&dentry->d_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001887 error = nfs_safe_remove(dentry);
Trond Myklebustd45b9d82008-01-28 19:43:18 -05001888 if (!error || error == -ENOENT) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001889 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1890 } else if (need_rehash)
1891 d_rehash(dentry);
Trond Myklebust1ca42382013-08-21 12:36:04 -04001892out:
1893 trace_nfs_unlink_exit(dir, dentry, error);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001894 return error;
1895}
Bryan Schumakerddda8e02012-07-30 16:05:23 -04001896EXPORT_SYMBOL_GPL(nfs_unlink);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001897
Chuck Lever873101b2006-08-22 20:06:23 -04001898/*
1899 * To create a symbolic link, most file systems instantiate a new inode,
1900 * add a page to it containing the path, then write it out to the disk
1901 * using prepare_write/commit_write.
1902 *
1903 * Unfortunately the NFS client can't create the in-core inode first
1904 * because it needs a file handle to create an in-core inode (see
1905 * fs/nfs/inode.c:nfs_fhget). We only have a file handle *after* the
1906 * symlink request has completed on the server.
1907 *
1908 * So instead we allocate a raw page, copy the symname into it, then do
1909 * the SYMLINK request with the page as the buffer. If it succeeds, we
1910 * now have a new file handle and can instantiate an in-core NFS inode
1911 * and move the raw page into its mapping.
1912 */
Bryan Schumaker597d9282012-07-16 16:39:10 -04001913int nfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001914{
Chuck Lever873101b2006-08-22 20:06:23 -04001915 struct page *page;
1916 char *kaddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001917 struct iattr attr;
Chuck Lever873101b2006-08-22 20:06:23 -04001918 unsigned int pathlen = strlen(symname);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001919 int error;
1920
Niels de Vos1e8968c2013-12-17 18:20:16 +01001921 dfprintk(VFS, "NFS: symlink(%s/%lu, %pd, %s)\n", dir->i_sb->s_id,
Al Viro6de14722013-09-16 10:53:17 -04001922 dir->i_ino, dentry, symname);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001923
Chuck Lever873101b2006-08-22 20:06:23 -04001924 if (pathlen > PAGE_SIZE)
1925 return -ENAMETOOLONG;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001926
Chuck Lever873101b2006-08-22 20:06:23 -04001927 attr.ia_mode = S_IFLNK | S_IRWXUGO;
1928 attr.ia_valid = ATTR_MODE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001929
Al Viroe8ecde22016-01-14 17:52:59 -05001930 page = alloc_page(GFP_USER);
Trond Myklebust76566992008-06-11 15:44:22 -04001931 if (!page)
Chuck Lever873101b2006-08-22 20:06:23 -04001932 return -ENOMEM;
Chuck Lever873101b2006-08-22 20:06:23 -04001933
Al Viroe8ecde22016-01-14 17:52:59 -05001934 kaddr = page_address(page);
Chuck Lever873101b2006-08-22 20:06:23 -04001935 memcpy(kaddr, symname, pathlen);
1936 if (pathlen < PAGE_SIZE)
1937 memset(kaddr + pathlen, 0, PAGE_SIZE - pathlen);
Chuck Lever873101b2006-08-22 20:06:23 -04001938
Trond Myklebust1ca42382013-08-21 12:36:04 -04001939 trace_nfs_symlink_enter(dir, dentry);
Chuck Lever94a6d752006-08-22 20:06:23 -04001940 error = NFS_PROTO(dir)->symlink(dir, dentry, page, pathlen, &attr);
Trond Myklebust1ca42382013-08-21 12:36:04 -04001941 trace_nfs_symlink_exit(dir, dentry, error);
Chuck Lever873101b2006-08-22 20:06:23 -04001942 if (error != 0) {
Niels de Vos1e8968c2013-12-17 18:20:16 +01001943 dfprintk(VFS, "NFS: symlink(%s/%lu, %pd, %s) error %d\n",
Chuck Lever873101b2006-08-22 20:06:23 -04001944 dir->i_sb->s_id, dir->i_ino,
Al Viro6de14722013-09-16 10:53:17 -04001945 dentry, symname, error);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001946 d_drop(dentry);
Chuck Lever873101b2006-08-22 20:06:23 -04001947 __free_page(page);
Chuck Lever873101b2006-08-22 20:06:23 -04001948 return error;
1949 }
1950
1951 /*
1952 * No big deal if we can't add this page to the page cache here.
1953 * READLINK will get the missing page from the server if needed.
1954 */
David Howells2b0143b2015-03-17 22:25:59 +00001955 if (!add_to_page_cache_lru(page, d_inode(dentry)->i_mapping, 0,
Chuck Lever873101b2006-08-22 20:06:23 -04001956 GFP_KERNEL)) {
Chuck Lever873101b2006-08-22 20:06:23 -04001957 SetPageUptodate(page);
1958 unlock_page(page);
Rafael Aquinia0b54ad2014-02-10 14:25:48 -08001959 /*
1960 * add_to_page_cache_lru() grabs an extra page refcount.
1961 * Drop it here to avoid leaking this page later.
1962 */
Kirill A. Shutemov09cbfea2016-04-01 15:29:47 +03001963 put_page(page);
Chuck Lever873101b2006-08-22 20:06:23 -04001964 } else
1965 __free_page(page);
1966
Chuck Lever873101b2006-08-22 20:06:23 -04001967 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001968}
Bryan Schumakerddda8e02012-07-30 16:05:23 -04001969EXPORT_SYMBOL_GPL(nfs_symlink);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001970
Bryan Schumaker597d9282012-07-16 16:39:10 -04001971int
Linus Torvalds1da177e2005-04-16 15:20:36 -07001972nfs_link(struct dentry *old_dentry, struct inode *dir, struct dentry *dentry)
1973{
David Howells2b0143b2015-03-17 22:25:59 +00001974 struct inode *inode = d_inode(old_dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001975 int error;
1976
Al Viro6de14722013-09-16 10:53:17 -04001977 dfprintk(VFS, "NFS: link(%pd2 -> %pd2)\n",
1978 old_dentry, dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001979
Trond Myklebust1fd10852013-08-21 13:54:44 -04001980 trace_nfs_link_enter(inode, dir, dentry);
Bryan Schumaker57ec14c2012-06-20 15:53:44 -04001981 NFS_PROTO(inode)->return_delegation(inode);
Trond Myklebust9a3936a2009-10-26 08:09:46 -04001982
Trond Myklebust9697d232007-10-02 21:58:05 -04001983 d_drop(dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001984 error = NFS_PROTO(dir)->link(inode, dir, &dentry->d_name);
Trond Myklebustcf809552005-10-27 22:12:42 -04001985 if (error == 0) {
Al Viro7de9c6ee2010-10-23 11:11:40 -04001986 ihold(inode);
Trond Myklebust9697d232007-10-02 21:58:05 -04001987 d_add(dentry, inode);
Trond Myklebustcf809552005-10-27 22:12:42 -04001988 }
Trond Myklebust1fd10852013-08-21 13:54:44 -04001989 trace_nfs_link_exit(inode, dir, dentry, error);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001990 return error;
1991}
Bryan Schumakerddda8e02012-07-30 16:05:23 -04001992EXPORT_SYMBOL_GPL(nfs_link);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001993
1994/*
1995 * RENAME
1996 * FIXME: Some nfsds, like the Linux user space nfsd, may generate a
1997 * different file handle for the same inode after a rename (e.g. when
1998 * moving to a different directory). A fail-safe method to do so would
1999 * be to look up old_dir/old_name, create a link to new_dir/new_name and
2000 * rename the old file using the sillyrename stuff. This way, the original
2001 * file in old_dir will go away when the last process iput()s the inode.
2002 *
2003 * FIXED.
2004 *
2005 * It actually works quite well. One needs to have the possibility for
2006 * at least one ".nfs..." file in each directory the file ever gets
2007 * moved or linked to which happens automagically with the new
2008 * implementation that only depends on the dcache stuff instead of
2009 * using the inode layer
2010 *
2011 * Unfortunately, things are a little more complicated than indicated
2012 * above. For a cross-directory move, we want to make sure we can get
2013 * rid of the old inode after the operation. This means there must be
2014 * no pending writes (if it's a file), and the use count must be 1.
2015 * If these conditions are met, we can drop the dentries before doing
2016 * the rename.
2017 */
Bryan Schumaker597d9282012-07-16 16:39:10 -04002018int nfs_rename(struct inode *old_dir, struct dentry *old_dentry,
Miklos Szeredi1cd66c92016-09-27 11:03:58 +02002019 struct inode *new_dir, struct dentry *new_dentry,
2020 unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002021{
David Howells2b0143b2015-03-17 22:25:59 +00002022 struct inode *old_inode = d_inode(old_dentry);
2023 struct inode *new_inode = d_inode(new_dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002024 struct dentry *dentry = NULL, *rehash = NULL;
Jeff Layton80a491f2014-03-17 07:06:56 -04002025 struct rpc_task *task;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002026 int error = -EBUSY;
2027
Miklos Szeredi1cd66c92016-09-27 11:03:58 +02002028 if (flags)
2029 return -EINVAL;
2030
Al Viro6de14722013-09-16 10:53:17 -04002031 dfprintk(VFS, "NFS: rename(%pd2 -> %pd2, ct=%d)\n",
2032 old_dentry, new_dentry,
Al Viro84d08fa2013-07-05 18:59:33 +04002033 d_count(new_dentry));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002034
Trond Myklebust70ded202013-08-21 12:08:45 -04002035 trace_nfs_rename_enter(old_dir, old_dentry, new_dir, new_dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002036 /*
Miklos Szeredi28f79a12009-12-03 15:58:56 -05002037 * For non-directories, check whether the target is busy and if so,
2038 * make a copy of the dentry and then do a silly-rename. If the
2039 * silly-rename succeeds, the copied dentry is hashed and becomes
2040 * the new target.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002041 */
Miklos Szeredi27226102009-12-03 15:58:56 -05002042 if (new_inode && !S_ISDIR(new_inode->i_mode)) {
2043 /*
2044 * To prevent any new references to the target during the
2045 * rename, we unhash the dentry in advance.
2046 */
2047 if (!d_unhashed(new_dentry)) {
2048 d_drop(new_dentry);
2049 rehash = new_dentry;
2050 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002051
Al Viro84d08fa2013-07-05 18:59:33 +04002052 if (d_count(new_dentry) > 2) {
Miklos Szeredi27226102009-12-03 15:58:56 -05002053 int err;
2054
2055 /* copy the target dentry's name */
2056 dentry = d_alloc(new_dentry->d_parent,
2057 &new_dentry->d_name);
2058 if (!dentry)
2059 goto out;
2060
2061 /* silly-rename the existing target ... */
2062 err = nfs_sillyrename(new_dir, new_dentry);
Miklos Szeredi24e93022009-12-03 15:58:56 -05002063 if (err)
Miklos Szeredi27226102009-12-03 15:58:56 -05002064 goto out;
Miklos Szeredi24e93022009-12-03 15:58:56 -05002065
2066 new_dentry = dentry;
OGAWA Hirofumi56335932010-01-06 18:48:26 -05002067 rehash = NULL;
Miklos Szeredi24e93022009-12-03 15:58:56 -05002068 new_inode = NULL;
Miklos Szeredi27226102009-12-03 15:58:56 -05002069 }
Trond Myklebustb1e4adf2009-03-19 15:35:49 -04002070 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002071
Bryan Schumaker57ec14c2012-06-20 15:53:44 -04002072 NFS_PROTO(old_inode)->return_delegation(old_inode);
Trond Myklebustb1e4adf2009-03-19 15:35:49 -04002073 if (new_inode != NULL)
Bryan Schumaker57ec14c2012-06-20 15:53:44 -04002074 NFS_PROTO(new_inode)->return_delegation(new_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002075
Jeff Layton80a491f2014-03-17 07:06:56 -04002076 task = nfs_async_rename(old_dir, new_dir, old_dentry, new_dentry, NULL);
2077 if (IS_ERR(task)) {
2078 error = PTR_ERR(task);
2079 goto out;
2080 }
2081
2082 error = rpc_wait_for_completion_task(task);
2083 if (error == 0)
2084 error = task->tk_status;
2085 rpc_put_task(task);
Trond Myklebust5ba7cc42005-12-03 15:20:17 -05002086 nfs_mark_for_revalidate(old_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002087out:
2088 if (rehash)
2089 d_rehash(rehash);
Trond Myklebust70ded202013-08-21 12:08:45 -04002090 trace_nfs_rename_exit(old_dir, old_dentry,
2091 new_dir, new_dentry, error);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002092 if (!error) {
Trond Myklebustb1e4adf2009-03-19 15:35:49 -04002093 if (new_inode != NULL)
2094 nfs_drop_nlink(new_inode);
Mark Fasheh349457c2006-09-08 14:22:21 -07002095 d_move(old_dentry, new_dentry);
Chuck Lever8fb559f2007-09-24 15:40:16 -04002096 nfs_set_verifier(new_dentry,
2097 nfs_save_change_attribute(new_dir));
Trond Myklebustd45b9d82008-01-28 19:43:18 -05002098 } else if (error == -ENOENT)
2099 nfs_dentry_handle_enoent(old_dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002100
2101 /* new dentry created? */
2102 if (dentry)
2103 dput(dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002104 return error;
2105}
Bryan Schumakerddda8e02012-07-30 16:05:23 -04002106EXPORT_SYMBOL_GPL(nfs_rename);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002107
Trond Myklebustcfcea3e2006-07-25 11:28:18 -04002108static DEFINE_SPINLOCK(nfs_access_lru_lock);
2109static LIST_HEAD(nfs_access_lru_list);
2110static atomic_long_t nfs_access_nr_entries;
2111
Trond Myklebust3a505842014-07-21 13:53:48 -04002112static unsigned long nfs_access_max_cachesize = ULONG_MAX;
2113module_param(nfs_access_max_cachesize, ulong, 0644);
2114MODULE_PARM_DESC(nfs_access_max_cachesize, "NFS access maximum total cache length");
2115
Trond Myklebust1c3c07e2006-07-25 11:28:18 -04002116static void nfs_access_free_entry(struct nfs_access_entry *entry)
2117{
2118 put_rpccred(entry->cred);
NeilBrownf682a392014-07-14 11:28:20 +10002119 kfree_rcu(entry, rcu_head);
Peter Zijlstra4e857c52014-03-17 18:06:10 +01002120 smp_mb__before_atomic();
Trond Myklebustcfcea3e2006-07-25 11:28:18 -04002121 atomic_long_dec(&nfs_access_nr_entries);
Peter Zijlstra4e857c52014-03-17 18:06:10 +01002122 smp_mb__after_atomic();
Trond Myklebust1c3c07e2006-07-25 11:28:18 -04002123}
2124
Trond Myklebust1a81bb82010-05-13 12:51:06 -04002125static void nfs_access_free_list(struct list_head *head)
2126{
2127 struct nfs_access_entry *cache;
2128
2129 while (!list_empty(head)) {
2130 cache = list_entry(head->next, struct nfs_access_entry, lru);
2131 list_del(&cache->lru);
2132 nfs_access_free_entry(cache);
2133 }
2134}
2135
Trond Myklebust3a505842014-07-21 13:53:48 -04002136static unsigned long
2137nfs_do_access_cache_scan(unsigned int nr_to_scan)
Trond Myklebust979df722006-07-25 11:28:19 -04002138{
2139 LIST_HEAD(head);
Trond Myklebustaa510da2010-09-29 15:11:56 -04002140 struct nfs_inode *nfsi, *next;
Trond Myklebust979df722006-07-25 11:28:19 -04002141 struct nfs_access_entry *cache;
Dave Chinner1ab6c492013-08-28 10:18:09 +10002142 long freed = 0;
Trond Myklebust979df722006-07-25 11:28:19 -04002143
Trond Myklebusta50f7952007-06-05 19:23:43 -04002144 spin_lock(&nfs_access_lru_lock);
Trond Myklebustaa510da2010-09-29 15:11:56 -04002145 list_for_each_entry_safe(nfsi, next, &nfs_access_lru_list, access_cache_inode_lru) {
Trond Myklebust979df722006-07-25 11:28:19 -04002146 struct inode *inode;
2147
2148 if (nr_to_scan-- == 0)
2149 break;
Trond Myklebust9c7e7e22010-05-13 12:51:06 -04002150 inode = &nfsi->vfs_inode;
Trond Myklebust979df722006-07-25 11:28:19 -04002151 spin_lock(&inode->i_lock);
2152 if (list_empty(&nfsi->access_cache_entry_lru))
2153 goto remove_lru_entry;
2154 cache = list_entry(nfsi->access_cache_entry_lru.next,
2155 struct nfs_access_entry, lru);
2156 list_move(&cache->lru, &head);
2157 rb_erase(&cache->rb_node, &nfsi->access_cache);
Dave Chinner1ab6c492013-08-28 10:18:09 +10002158 freed++;
Trond Myklebust979df722006-07-25 11:28:19 -04002159 if (!list_empty(&nfsi->access_cache_entry_lru))
2160 list_move_tail(&nfsi->access_cache_inode_lru,
2161 &nfs_access_lru_list);
2162 else {
2163remove_lru_entry:
2164 list_del_init(&nfsi->access_cache_inode_lru);
Peter Zijlstra4e857c52014-03-17 18:06:10 +01002165 smp_mb__before_atomic();
Trond Myklebust979df722006-07-25 11:28:19 -04002166 clear_bit(NFS_INO_ACL_LRU_SET, &nfsi->flags);
Peter Zijlstra4e857c52014-03-17 18:06:10 +01002167 smp_mb__after_atomic();
Trond Myklebust979df722006-07-25 11:28:19 -04002168 }
Trond Myklebust59844a92010-05-26 08:42:24 -04002169 spin_unlock(&inode->i_lock);
Trond Myklebust979df722006-07-25 11:28:19 -04002170 }
2171 spin_unlock(&nfs_access_lru_lock);
Trond Myklebust1a81bb82010-05-13 12:51:06 -04002172 nfs_access_free_list(&head);
Dave Chinner1ab6c492013-08-28 10:18:09 +10002173 return freed;
2174}
2175
2176unsigned long
Trond Myklebust3a505842014-07-21 13:53:48 -04002177nfs_access_cache_scan(struct shrinker *shrink, struct shrink_control *sc)
2178{
2179 int nr_to_scan = sc->nr_to_scan;
2180 gfp_t gfp_mask = sc->gfp_mask;
2181
2182 if ((gfp_mask & GFP_KERNEL) != GFP_KERNEL)
2183 return SHRINK_STOP;
2184 return nfs_do_access_cache_scan(nr_to_scan);
2185}
2186
2187
2188unsigned long
Dave Chinner1ab6c492013-08-28 10:18:09 +10002189nfs_access_cache_count(struct shrinker *shrink, struct shrink_control *sc)
2190{
Glauber Costa55f841c2013-08-28 10:17:53 +10002191 return vfs_pressure_ratio(atomic_long_read(&nfs_access_nr_entries));
Trond Myklebust979df722006-07-25 11:28:19 -04002192}
2193
Trond Myklebust3a505842014-07-21 13:53:48 -04002194static void
2195nfs_access_cache_enforce_limit(void)
2196{
2197 long nr_entries = atomic_long_read(&nfs_access_nr_entries);
2198 unsigned long diff;
2199 unsigned int nr_to_scan;
2200
2201 if (nr_entries < 0 || nr_entries <= nfs_access_max_cachesize)
2202 return;
2203 nr_to_scan = 100;
2204 diff = nr_entries - nfs_access_max_cachesize;
2205 if (diff < nr_to_scan)
2206 nr_to_scan = diff;
2207 nfs_do_access_cache_scan(nr_to_scan);
2208}
2209
Trond Myklebust1a81bb82010-05-13 12:51:06 -04002210static void __nfs_access_zap_cache(struct nfs_inode *nfsi, struct list_head *head)
Trond Myklebust1c3c07e2006-07-25 11:28:18 -04002211{
Trond Myklebust1c3c07e2006-07-25 11:28:18 -04002212 struct rb_root *root_node = &nfsi->access_cache;
Trond Myklebust1a81bb82010-05-13 12:51:06 -04002213 struct rb_node *n;
Trond Myklebust1c3c07e2006-07-25 11:28:18 -04002214 struct nfs_access_entry *entry;
2215
2216 /* Unhook entries from the cache */
2217 while ((n = rb_first(root_node)) != NULL) {
2218 entry = rb_entry(n, struct nfs_access_entry, rb_node);
2219 rb_erase(n, root_node);
Trond Myklebust1a81bb82010-05-13 12:51:06 -04002220 list_move(&entry->lru, head);
Trond Myklebust1c3c07e2006-07-25 11:28:18 -04002221 }
2222 nfsi->cache_validity &= ~NFS_INO_INVALID_ACCESS;
Trond Myklebust1c3c07e2006-07-25 11:28:18 -04002223}
2224
2225void nfs_access_zap_cache(struct inode *inode)
2226{
Trond Myklebust1a81bb82010-05-13 12:51:06 -04002227 LIST_HEAD(head);
2228
2229 if (test_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags) == 0)
2230 return;
Trond Myklebustcfcea3e2006-07-25 11:28:18 -04002231 /* Remove from global LRU init */
Trond Myklebust1a81bb82010-05-13 12:51:06 -04002232 spin_lock(&nfs_access_lru_lock);
2233 if (test_and_clear_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags))
Trond Myklebustcfcea3e2006-07-25 11:28:18 -04002234 list_del_init(&NFS_I(inode)->access_cache_inode_lru);
Trond Myklebustcfcea3e2006-07-25 11:28:18 -04002235
Trond Myklebust1c3c07e2006-07-25 11:28:18 -04002236 spin_lock(&inode->i_lock);
Trond Myklebust1a81bb82010-05-13 12:51:06 -04002237 __nfs_access_zap_cache(NFS_I(inode), &head);
2238 spin_unlock(&inode->i_lock);
2239 spin_unlock(&nfs_access_lru_lock);
2240 nfs_access_free_list(&head);
Trond Myklebust1c3c07e2006-07-25 11:28:18 -04002241}
Bryan Schumaker1c606fb2012-07-30 16:05:24 -04002242EXPORT_SYMBOL_GPL(nfs_access_zap_cache);
Trond Myklebust1c3c07e2006-07-25 11:28:18 -04002243
2244static struct nfs_access_entry *nfs_access_search_rbtree(struct inode *inode, struct rpc_cred *cred)
2245{
2246 struct rb_node *n = NFS_I(inode)->access_cache.rb_node;
2247 struct nfs_access_entry *entry;
2248
2249 while (n != NULL) {
2250 entry = rb_entry(n, struct nfs_access_entry, rb_node);
2251
2252 if (cred < entry->cred)
2253 n = n->rb_left;
2254 else if (cred > entry->cred)
2255 n = n->rb_right;
2256 else
2257 return entry;
2258 }
2259 return NULL;
2260}
2261
Trond Myklebust57b69182016-06-03 17:07:19 -04002262static int nfs_access_get_cached(struct inode *inode, struct rpc_cred *cred, struct nfs_access_entry *res, bool may_block)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002263{
Chuck Lever55296802005-08-18 11:24:09 -07002264 struct nfs_inode *nfsi = NFS_I(inode);
Trond Myklebust1c3c07e2006-07-25 11:28:18 -04002265 struct nfs_access_entry *cache;
Trond Myklebust57b69182016-06-03 17:07:19 -04002266 bool retry = true;
2267 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002268
Trond Myklebust1c3c07e2006-07-25 11:28:18 -04002269 spin_lock(&inode->i_lock);
Trond Myklebust57b69182016-06-03 17:07:19 -04002270 for(;;) {
2271 if (nfsi->cache_validity & NFS_INO_INVALID_ACCESS)
2272 goto out_zap;
2273 cache = nfs_access_search_rbtree(inode, cred);
2274 err = -ENOENT;
2275 if (cache == NULL)
2276 goto out;
2277 /* Found an entry, is our attribute cache valid? */
2278 if (!nfs_attribute_cache_expired(inode) &&
2279 !(nfsi->cache_validity & NFS_INO_INVALID_ATTR))
2280 break;
2281 err = -ECHILD;
2282 if (!may_block)
2283 goto out;
2284 if (!retry)
2285 goto out_zap;
2286 spin_unlock(&inode->i_lock);
2287 err = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
2288 if (err)
2289 return err;
2290 spin_lock(&inode->i_lock);
2291 retry = false;
2292 }
Trond Myklebust1c3c07e2006-07-25 11:28:18 -04002293 res->jiffies = cache->jiffies;
2294 res->cred = cache->cred;
2295 res->mask = cache->mask;
Trond Myklebustcfcea3e2006-07-25 11:28:18 -04002296 list_move_tail(&cache->lru, &nfsi->access_cache_entry_lru);
Trond Myklebust1c3c07e2006-07-25 11:28:18 -04002297 err = 0;
2298out:
2299 spin_unlock(&inode->i_lock);
2300 return err;
Trond Myklebust1c3c07e2006-07-25 11:28:18 -04002301out_zap:
Trond Myklebust1a81bb82010-05-13 12:51:06 -04002302 spin_unlock(&inode->i_lock);
2303 nfs_access_zap_cache(inode);
Trond Myklebust1c3c07e2006-07-25 11:28:18 -04002304 return -ENOENT;
2305}
2306
NeilBrownf682a392014-07-14 11:28:20 +10002307static int nfs_access_get_cached_rcu(struct inode *inode, struct rpc_cred *cred, struct nfs_access_entry *res)
2308{
2309 /* Only check the most recently returned cache entry,
2310 * but do it without locking.
2311 */
2312 struct nfs_inode *nfsi = NFS_I(inode);
2313 struct nfs_access_entry *cache;
2314 int err = -ECHILD;
2315 struct list_head *lh;
2316
2317 rcu_read_lock();
2318 if (nfsi->cache_validity & NFS_INO_INVALID_ACCESS)
2319 goto out;
2320 lh = rcu_dereference(nfsi->access_cache_entry_lru.prev);
2321 cache = list_entry(lh, struct nfs_access_entry, lru);
2322 if (lh == &nfsi->access_cache_entry_lru ||
2323 cred != cache->cred)
2324 cache = NULL;
2325 if (cache == NULL)
2326 goto out;
Trond Myklebust57b69182016-06-03 17:07:19 -04002327 err = nfs_revalidate_inode_rcu(NFS_SERVER(inode), inode);
2328 if (err)
NeilBrownf682a392014-07-14 11:28:20 +10002329 goto out;
2330 res->jiffies = cache->jiffies;
2331 res->cred = cache->cred;
2332 res->mask = cache->mask;
NeilBrownf682a392014-07-14 11:28:20 +10002333out:
2334 rcu_read_unlock();
2335 return err;
2336}
2337
Trond Myklebust1c3c07e2006-07-25 11:28:18 -04002338static void nfs_access_add_rbtree(struct inode *inode, struct nfs_access_entry *set)
2339{
Trond Myklebustcfcea3e2006-07-25 11:28:18 -04002340 struct nfs_inode *nfsi = NFS_I(inode);
2341 struct rb_root *root_node = &nfsi->access_cache;
Trond Myklebust1c3c07e2006-07-25 11:28:18 -04002342 struct rb_node **p = &root_node->rb_node;
2343 struct rb_node *parent = NULL;
2344 struct nfs_access_entry *entry;
2345
2346 spin_lock(&inode->i_lock);
2347 while (*p != NULL) {
2348 parent = *p;
2349 entry = rb_entry(parent, struct nfs_access_entry, rb_node);
2350
2351 if (set->cred < entry->cred)
2352 p = &parent->rb_left;
2353 else if (set->cred > entry->cred)
2354 p = &parent->rb_right;
2355 else
2356 goto found;
2357 }
2358 rb_link_node(&set->rb_node, parent, p);
2359 rb_insert_color(&set->rb_node, root_node);
Trond Myklebustcfcea3e2006-07-25 11:28:18 -04002360 list_add_tail(&set->lru, &nfsi->access_cache_entry_lru);
Trond Myklebust1c3c07e2006-07-25 11:28:18 -04002361 spin_unlock(&inode->i_lock);
2362 return;
2363found:
2364 rb_replace_node(parent, &set->rb_node, root_node);
Trond Myklebustcfcea3e2006-07-25 11:28:18 -04002365 list_add_tail(&set->lru, &nfsi->access_cache_entry_lru);
2366 list_del(&entry->lru);
Trond Myklebust1c3c07e2006-07-25 11:28:18 -04002367 spin_unlock(&inode->i_lock);
2368 nfs_access_free_entry(entry);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002369}
2370
Weston Andros Adamson6168f622012-09-10 14:00:46 -04002371void nfs_access_add_cache(struct inode *inode, struct nfs_access_entry *set)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002372{
Trond Myklebust1c3c07e2006-07-25 11:28:18 -04002373 struct nfs_access_entry *cache = kmalloc(sizeof(*cache), GFP_KERNEL);
2374 if (cache == NULL)
2375 return;
2376 RB_CLEAR_NODE(&cache->rb_node);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002377 cache->jiffies = set->jiffies;
Trond Myklebust1c3c07e2006-07-25 11:28:18 -04002378 cache->cred = get_rpccred(set->cred);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002379 cache->mask = set->mask;
Trond Myklebust1c3c07e2006-07-25 11:28:18 -04002380
NeilBrownf682a392014-07-14 11:28:20 +10002381 /* The above field assignments must be visible
2382 * before this item appears on the lru. We cannot easily
2383 * use rcu_assign_pointer, so just force the memory barrier.
2384 */
2385 smp_wmb();
Trond Myklebust1c3c07e2006-07-25 11:28:18 -04002386 nfs_access_add_rbtree(inode, cache);
Trond Myklebustcfcea3e2006-07-25 11:28:18 -04002387
2388 /* Update accounting */
Peter Zijlstra4e857c52014-03-17 18:06:10 +01002389 smp_mb__before_atomic();
Trond Myklebustcfcea3e2006-07-25 11:28:18 -04002390 atomic_long_inc(&nfs_access_nr_entries);
Peter Zijlstra4e857c52014-03-17 18:06:10 +01002391 smp_mb__after_atomic();
Trond Myklebustcfcea3e2006-07-25 11:28:18 -04002392
2393 /* Add inode to global LRU list */
Trond Myklebust1a81bb82010-05-13 12:51:06 -04002394 if (!test_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags)) {
Trond Myklebustcfcea3e2006-07-25 11:28:18 -04002395 spin_lock(&nfs_access_lru_lock);
Trond Myklebust1a81bb82010-05-13 12:51:06 -04002396 if (!test_and_set_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags))
2397 list_add_tail(&NFS_I(inode)->access_cache_inode_lru,
2398 &nfs_access_lru_list);
Trond Myklebustcfcea3e2006-07-25 11:28:18 -04002399 spin_unlock(&nfs_access_lru_lock);
2400 }
Trond Myklebust3a505842014-07-21 13:53:48 -04002401 nfs_access_cache_enforce_limit();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002402}
Weston Andros Adamson6168f622012-09-10 14:00:46 -04002403EXPORT_SYMBOL_GPL(nfs_access_add_cache);
2404
2405void nfs_access_set_mask(struct nfs_access_entry *entry, u32 access_result)
2406{
2407 entry->mask = 0;
2408 if (access_result & NFS4_ACCESS_READ)
2409 entry->mask |= MAY_READ;
2410 if (access_result &
2411 (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
2412 entry->mask |= MAY_WRITE;
2413 if (access_result & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
2414 entry->mask |= MAY_EXEC;
2415}
2416EXPORT_SYMBOL_GPL(nfs_access_set_mask);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002417
2418static int nfs_do_access(struct inode *inode, struct rpc_cred *cred, int mask)
2419{
2420 struct nfs_access_entry cache;
Trond Myklebust57b69182016-06-03 17:07:19 -04002421 bool may_block = (mask & MAY_NOT_BLOCK) == 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002422 int status;
2423
Trond Myklebustf4ce1292013-08-19 18:59:33 -04002424 trace_nfs_access_enter(inode);
2425
NeilBrownf682a392014-07-14 11:28:20 +10002426 status = nfs_access_get_cached_rcu(inode, cred, &cache);
2427 if (status != 0)
Trond Myklebust57b69182016-06-03 17:07:19 -04002428 status = nfs_access_get_cached(inode, cred, &cache, may_block);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002429 if (status == 0)
Trond Myklebustf4ce1292013-08-19 18:59:33 -04002430 goto out_cached;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002431
NeilBrownf3324a22014-07-14 11:28:20 +10002432 status = -ECHILD;
Trond Myklebust57b69182016-06-03 17:07:19 -04002433 if (!may_block)
NeilBrownf3324a22014-07-14 11:28:20 +10002434 goto out;
2435
Linus Torvalds1da177e2005-04-16 15:20:36 -07002436 /* Be clever: ask server to check for all possible rights */
2437 cache.mask = MAY_EXEC | MAY_WRITE | MAY_READ;
2438 cache.cred = cred;
2439 cache.jiffies = jiffies;
2440 status = NFS_PROTO(inode)->access(inode, &cache);
Suresh Jayaramana71ee332009-03-10 20:33:21 -04002441 if (status != 0) {
2442 if (status == -ESTALE) {
2443 nfs_zap_caches(inode);
2444 if (!S_ISDIR(inode->i_mode))
2445 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
2446 }
Trond Myklebustf4ce1292013-08-19 18:59:33 -04002447 goto out;
Suresh Jayaramana71ee332009-03-10 20:33:21 -04002448 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002449 nfs_access_add_cache(inode, &cache);
Trond Myklebustf4ce1292013-08-19 18:59:33 -04002450out_cached:
2451 if ((mask & ~cache.mask & (MAY_READ | MAY_WRITE | MAY_EXEC)) != 0)
2452 status = -EACCES;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002453out:
Trond Myklebustf4ce1292013-08-19 18:59:33 -04002454 trace_nfs_access_exit(inode, status);
2455 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002456}
2457
Trond Myklebustaf22f942007-08-10 17:45:10 -04002458static int nfs_open_permission_mask(int openflags)
2459{
2460 int mask = 0;
2461
Weston Andros Adamsonf8d9a892013-01-03 16:42:29 -05002462 if (openflags & __FMODE_EXEC) {
2463 /* ONLY check exec rights */
2464 mask = MAY_EXEC;
2465 } else {
2466 if ((openflags & O_ACCMODE) != O_WRONLY)
2467 mask |= MAY_READ;
2468 if ((openflags & O_ACCMODE) != O_RDONLY)
2469 mask |= MAY_WRITE;
2470 }
2471
Trond Myklebustaf22f942007-08-10 17:45:10 -04002472 return mask;
2473}
2474
2475int nfs_may_open(struct inode *inode, struct rpc_cred *cred, int openflags)
2476{
2477 return nfs_do_access(inode, cred, nfs_open_permission_mask(openflags));
2478}
Bryan Schumaker89d77c82012-07-30 16:05:25 -04002479EXPORT_SYMBOL_GPL(nfs_may_open);
Trond Myklebustaf22f942007-08-10 17:45:10 -04002480
Trond Myklebust5c5fc092015-12-28 19:30:05 -05002481static int nfs_execute_ok(struct inode *inode, int mask)
2482{
2483 struct nfs_server *server = NFS_SERVER(inode);
2484 int ret;
2485
2486 if (mask & MAY_NOT_BLOCK)
2487 ret = nfs_revalidate_inode_rcu(server, inode);
2488 else
2489 ret = nfs_revalidate_inode(server, inode);
2490 if (ret == 0 && !execute_ok(inode))
2491 ret = -EACCES;
2492 return ret;
2493}
2494
Al Viro10556cb2011-06-20 19:28:19 -04002495int nfs_permission(struct inode *inode, int mask)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002496{
2497 struct rpc_cred *cred;
2498 int res = 0;
2499
Chuck Lever91d5b472006-03-20 13:44:14 -05002500 nfs_inc_stats(inode, NFSIOS_VFSACCESS);
2501
Al Viroe6305c42008-07-15 21:03:57 -04002502 if ((mask & (MAY_READ | MAY_WRITE | MAY_EXEC)) == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002503 goto out;
2504 /* Is this sys_access() ? */
Eric Paris9cfcac82010-07-23 11:43:51 -04002505 if (mask & (MAY_ACCESS | MAY_CHDIR))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002506 goto force_lookup;
2507
2508 switch (inode->i_mode & S_IFMT) {
2509 case S_IFLNK:
2510 goto out;
2511 case S_IFREG:
Trond Myklebust762674f2015-12-26 21:54:58 -05002512 if ((mask & MAY_OPEN) &&
2513 nfs_server_capable(inode, NFS_CAP_ATOMIC_OPEN))
2514 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002515 break;
2516 case S_IFDIR:
2517 /*
2518 * Optimize away all write operations, since the server
2519 * will check permissions when we perform the op.
2520 */
2521 if ((mask & MAY_WRITE) && !(mask & MAY_READ))
2522 goto out;
2523 }
2524
2525force_lookup:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002526 if (!NFS_PROTO(inode)->access)
2527 goto out_notsup;
2528
NeilBrownf3324a22014-07-14 11:28:20 +10002529 /* Always try fast lookups first */
2530 rcu_read_lock();
2531 cred = rpc_lookup_cred_nonblock();
2532 if (!IS_ERR(cred))
2533 res = nfs_do_access(inode, cred, mask|MAY_NOT_BLOCK);
2534 else
Linus Torvalds1da177e2005-04-16 15:20:36 -07002535 res = PTR_ERR(cred);
NeilBrownf3324a22014-07-14 11:28:20 +10002536 rcu_read_unlock();
2537 if (res == -ECHILD && !(mask & MAY_NOT_BLOCK)) {
2538 /* Fast lookup failed, try the slow way */
2539 cred = rpc_lookup_cred();
2540 if (!IS_ERR(cred)) {
2541 res = nfs_do_access(inode, cred, mask);
2542 put_rpccred(cred);
2543 } else
2544 res = PTR_ERR(cred);
2545 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002546out:
Trond Myklebust5c5fc092015-12-28 19:30:05 -05002547 if (!res && (mask & MAY_EXEC))
2548 res = nfs_execute_ok(inode, mask);
Miklos Szeredif696a362008-07-31 13:41:58 +02002549
Niels de Vos1e8968c2013-12-17 18:20:16 +01002550 dfprintk(VFS, "NFS: permission(%s/%lu), mask=0x%x, res=%d\n",
Chuck Lever1e7cb3d2006-03-20 13:44:24 -05002551 inode->i_sb->s_id, inode->i_ino, mask, res);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002552 return res;
2553out_notsup:
NeilBrownd51ac1a2014-07-14 11:28:20 +10002554 if (mask & MAY_NOT_BLOCK)
2555 return -ECHILD;
2556
Linus Torvalds1da177e2005-04-16 15:20:36 -07002557 res = nfs_revalidate_inode(NFS_SERVER(inode), inode);
2558 if (res == 0)
Al Viro2830ba72011-06-20 19:16:29 -04002559 res = generic_permission(inode, mask);
Chuck Lever1e7cb3d2006-03-20 13:44:24 -05002560 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002561}
Bryan Schumakerddda8e02012-07-30 16:05:23 -04002562EXPORT_SYMBOL_GPL(nfs_permission);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002563
2564/*
2565 * Local variables:
2566 * version-control: t
2567 * kept-new-versions: 5
2568 * End:
2569 */