blob: 9b0c55cb2a2eaa9166670258ef7bf2b87824a0b7 [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 Viro23db8622013-05-17 16:34:50 -040060 .iterate = 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 {
Chuck Lever88b8e132012-03-01 17:00:23 -0500148 int size;
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400149 int eof_index;
150 u64 last_cookie;
151 struct nfs_cache_array_entry array[0];
152};
153
Chuck Lever573c4e12010-12-14 14:58:11 +0000154typedef int (*decode_dirent_t)(struct xdr_stream *, struct nfs_entry *, int);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155typedef struct {
156 struct file *file;
157 struct page *page;
Al Viro23db8622013-05-17 16:34:50 -0400158 struct dir_context *ctx;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 unsigned long page_index;
Trond Myklebustf0dd2132005-06-22 17:16:29 +0000160 u64 *dir_cookie;
Trond Myklebust0aded702010-11-30 21:56:32 -0500161 u64 last_cookie;
Trond Myklebustf0dd2132005-06-22 17:16:29 +0000162 loff_t current_index;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163 decode_dirent_t decode;
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400164
Neil Brown1f4eab72007-04-16 09:35:27 +1000165 unsigned long timestamp;
Trond Myklebust4704f0e2008-10-14 19:16:07 -0400166 unsigned long gencount;
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400167 unsigned int cache_entry_index;
168 unsigned int plus:1;
169 unsigned int eof:1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170} nfs_readdir_descriptor_t;
171
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400172/*
173 * The caller is responsible for calling nfs_readdir_release_array(page)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174 */
175static
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400176struct nfs_cache_array *nfs_readdir_get_array(struct page *page)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177{
Trond Myklebust8cd51a02010-11-15 20:26:22 -0500178 void *ptr;
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400179 if (page == NULL)
180 return ERR_PTR(-EIO);
Trond Myklebust8cd51a02010-11-15 20:26:22 -0500181 ptr = kmap(page);
182 if (ptr == NULL)
183 return ERR_PTR(-ENOMEM);
184 return ptr;
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400185}
186
187static
188void nfs_readdir_release_array(struct page *page)
189{
190 kunmap(page);
191}
192
193/*
194 * we are freeing strings created by nfs_add_to_readdir_array()
195 */
196static
Trond Myklebust11de3b12010-12-01 14:17:06 -0500197void nfs_readdir_clear_array(struct page *page)
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400198{
Trond Myklebust11de3b12010-12-01 14:17:06 -0500199 struct nfs_cache_array *array;
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400200 int i;
Trond Myklebust8cd51a02010-11-15 20:26:22 -0500201
Cong Wang2b86ce22011-11-25 23:14:33 +0800202 array = kmap_atomic(page);
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400203 for (i = 0; i < array->size; i++)
204 kfree(array->array[i].string.name);
Cong Wang2b86ce22011-11-25 23:14:33 +0800205 kunmap_atomic(array);
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400206}
207
208/*
209 * the caller is responsible for freeing qstr.name
210 * when called by nfs_readdir_add_to_array, the strings will be freed in
211 * nfs_clear_readdir_array()
212 */
213static
Trond Myklebust4a201d62010-10-23 14:53:23 -0400214int nfs_readdir_make_qstr(struct qstr *string, const char *name, unsigned int len)
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400215{
216 string->len = len;
217 string->name = kmemdup(name, len, GFP_KERNEL);
Trond Myklebust4a201d62010-10-23 14:53:23 -0400218 if (string->name == NULL)
219 return -ENOMEM;
Catalin Marinas04e4bd12010-11-11 12:53:47 +0000220 /*
221 * Avoid a kmemleak false positive. The pointer to the name is stored
222 * in a page cache page which kmemleak does not scan.
223 */
224 kmemleak_not_leak(string->name);
Trond Myklebust4a201d62010-10-23 14:53:23 -0400225 string->hash = full_name_hash(name, len);
226 return 0;
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400227}
228
229static
230int nfs_readdir_add_to_array(struct nfs_entry *entry, struct page *page)
231{
232 struct nfs_cache_array *array = nfs_readdir_get_array(page);
Trond Myklebust4a201d62010-10-23 14:53:23 -0400233 struct nfs_cache_array_entry *cache_entry;
234 int ret;
235
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400236 if (IS_ERR(array))
237 return PTR_ERR(array);
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400238
Trond Myklebust4a201d62010-10-23 14:53:23 -0400239 cache_entry = &array->array[array->size];
Trond Myklebust3020093f2010-11-20 15:18:22 -0500240
241 /* Check that this entry lies within the page bounds */
242 ret = -ENOSPC;
243 if ((char *)&cache_entry[1] - (char *)page_address(page) > PAGE_SIZE)
244 goto out;
245
Trond Myklebust4a201d62010-10-23 14:53:23 -0400246 cache_entry->cookie = entry->prev_cookie;
247 cache_entry->ino = entry->ino;
Trond Myklebust0b26a0b2010-11-20 14:26:44 -0500248 cache_entry->d_type = entry->d_type;
Trond Myklebust4a201d62010-10-23 14:53:23 -0400249 ret = nfs_readdir_make_qstr(&cache_entry->string, entry->name, entry->len);
250 if (ret)
251 goto out;
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400252 array->last_cookie = entry->cookie;
Trond Myklebust8cd51a02010-11-15 20:26:22 -0500253 array->size++;
Trond Myklebust47c716c2010-12-07 12:44:56 -0500254 if (entry->eof != 0)
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400255 array->eof_index = array->size;
Trond Myklebust4a201d62010-10-23 14:53:23 -0400256out:
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400257 nfs_readdir_release_array(page);
Trond Myklebust4a201d62010-10-23 14:53:23 -0400258 return ret;
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400259}
260
261static
262int nfs_readdir_search_for_pos(struct nfs_cache_array *array, nfs_readdir_descriptor_t *desc)
263{
Al Viro23db8622013-05-17 16:34:50 -0400264 loff_t diff = desc->ctx->pos - desc->current_index;
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400265 unsigned int index;
266
267 if (diff < 0)
268 goto out_eof;
269 if (diff >= array->size) {
Trond Myklebust8cd51a02010-11-15 20:26:22 -0500270 if (array->eof_index >= 0)
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400271 goto out_eof;
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400272 return -EAGAIN;
273 }
274
275 index = (unsigned int)diff;
276 *desc->dir_cookie = array->array[index].cookie;
277 desc->cache_entry_index = index;
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400278 return 0;
279out_eof:
280 desc->eof = 1;
281 return -EBADCOOKIE;
282}
283
Jeff Layton4db72b42014-01-28 13:47:46 -0500284static bool
285nfs_readdir_inode_mapping_valid(struct nfs_inode *nfsi)
286{
287 if (nfsi->cache_validity & (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA))
288 return false;
289 smp_rmb();
290 return !test_bit(NFS_INO_INVALIDATING, &nfsi->flags);
291}
292
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400293static
294int nfs_readdir_search_for_cookie(struct nfs_cache_array *array, nfs_readdir_descriptor_t *desc)
295{
296 int i;
Bryan Schumaker8ef2ce32011-03-23 15:04:31 -0400297 loff_t new_pos;
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400298 int status = -EAGAIN;
299
300 for (i = 0; i < array->size; i++) {
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400301 if (array->array[i].cookie == *desc->dir_cookie) {
Al Viro496ad9a2013-01-23 17:07:38 -0500302 struct nfs_inode *nfsi = NFS_I(file_inode(desc->file));
Trond Myklebust0c030802011-07-30 12:45:35 -0400303 struct nfs_open_dir_context *ctx = desc->file->private_data;
304
Bryan Schumaker8ef2ce32011-03-23 15:04:31 -0400305 new_pos = desc->current_index + i;
Jeff Layton4db72b42014-01-28 13:47:46 -0500306 if (ctx->attr_gencount != nfsi->attr_gencount ||
307 !nfs_readdir_inode_mapping_valid(nfsi)) {
Trond Myklebust0c030802011-07-30 12:45:35 -0400308 ctx->duped = 0;
309 ctx->attr_gencount = nfsi->attr_gencount;
Al Viro23db8622013-05-17 16:34:50 -0400310 } else if (new_pos < desc->ctx->pos) {
Trond Myklebust0c030802011-07-30 12:45:35 -0400311 if (ctx->duped > 0
312 && ctx->dup_cookie == *desc->dir_cookie) {
313 if (printk_ratelimit()) {
Al Viro6de14722013-09-16 10:53:17 -0400314 pr_notice("NFS: directory %pD2 contains a readdir loop."
Trond Myklebust0c030802011-07-30 12:45:35 -0400315 "Please contact your server vendor. "
Jeff Layton9581a4a2014-04-05 08:45:57 -0400316 "The file: %.*s has duplicate cookie %llu\n",
317 desc->file, array->array[i].string.len,
318 array->array[i].string.name, *desc->dir_cookie);
Trond Myklebust0c030802011-07-30 12:45:35 -0400319 }
320 status = -ELOOP;
321 goto out;
322 }
Bryan Schumaker8ef2ce32011-03-23 15:04:31 -0400323 ctx->dup_cookie = *desc->dir_cookie;
Trond Myklebust0c030802011-07-30 12:45:35 -0400324 ctx->duped = -1;
Bryan Schumaker8ef2ce32011-03-23 15:04:31 -0400325 }
Al Viro23db8622013-05-17 16:34:50 -0400326 desc->ctx->pos = new_pos;
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400327 desc->cache_entry_index = i;
Trond Myklebust47c716c2010-12-07 12:44:56 -0500328 return 0;
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400329 }
330 }
Trond Myklebust47c716c2010-12-07 12:44:56 -0500331 if (array->eof_index >= 0) {
Trond Myklebust8cd51a02010-11-15 20:26:22 -0500332 status = -EBADCOOKIE;
Trond Myklebust18fb5fe2010-12-07 12:41:58 -0500333 if (*desc->dir_cookie == array->last_cookie)
334 desc->eof = 1;
Trond Myklebust8cd51a02010-11-15 20:26:22 -0500335 }
Trond Myklebust0c030802011-07-30 12:45:35 -0400336out:
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400337 return status;
338}
339
340static
341int nfs_readdir_search_array(nfs_readdir_descriptor_t *desc)
342{
343 struct nfs_cache_array *array;
Trond Myklebust47c716c2010-12-07 12:44:56 -0500344 int status;
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400345
346 array = nfs_readdir_get_array(desc->page);
347 if (IS_ERR(array)) {
348 status = PTR_ERR(array);
349 goto out;
350 }
351
352 if (*desc->dir_cookie == 0)
353 status = nfs_readdir_search_for_pos(array, desc);
354 else
355 status = nfs_readdir_search_for_cookie(array, desc);
356
Trond Myklebust47c716c2010-12-07 12:44:56 -0500357 if (status == -EAGAIN) {
Trond Myklebust0aded702010-11-30 21:56:32 -0500358 desc->last_cookie = array->last_cookie;
Trond Myklebuste47c0852011-03-23 08:43:09 -0400359 desc->current_index += array->size;
Trond Myklebust47c716c2010-12-07 12:44:56 -0500360 desc->page_index++;
361 }
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400362 nfs_readdir_release_array(desc->page);
363out:
364 return status;
365}
366
367/* Fill a page with xdr information before transferring to the cache page */
368static
Bryan Schumaker56e4ebf2010-10-20 15:44:37 -0400369int nfs_readdir_xdr_filler(struct page **pages, nfs_readdir_descriptor_t *desc,
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400370 struct nfs_entry *entry, struct file *file, struct inode *inode)
371{
Bryan Schumaker480c2002011-03-23 14:48:29 -0400372 struct nfs_open_dir_context *ctx = file->private_data;
373 struct rpc_cred *cred = ctx->cred;
Trond Myklebust4704f0e2008-10-14 19:16:07 -0400374 unsigned long timestamp, gencount;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375 int error;
376
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377 again:
378 timestamp = jiffies;
Trond Myklebust4704f0e2008-10-14 19:16:07 -0400379 gencount = nfs_inc_attr_generation_counter();
Bryan Schumaker56e4ebf2010-10-20 15:44:37 -0400380 error = NFS_PROTO(inode)->readdir(file->f_path.dentry, cred, entry->cookie, pages,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381 NFS_SERVER(inode)->dtsize, desc->plus);
382 if (error < 0) {
383 /* We requested READDIRPLUS, but the server doesn't grok it */
384 if (error == -ENOTSUPP && desc->plus) {
385 NFS_SERVER(inode)->caps &= ~NFS_CAP_READDIRPLUS;
Benny Halevy3a10c302008-01-23 08:58:59 +0200386 clear_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(inode)->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387 desc->plus = 0;
388 goto again;
389 }
390 goto error;
391 }
Neil Brown1f4eab72007-04-16 09:35:27 +1000392 desc->timestamp = timestamp;
Trond Myklebust4704f0e2008-10-14 19:16:07 -0400393 desc->gencount = gencount;
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400394error:
395 return error;
396}
397
Chuck Lever573c4e12010-12-14 14:58:11 +0000398static int xdr_decode(nfs_readdir_descriptor_t *desc,
399 struct nfs_entry *entry, struct xdr_stream *xdr)
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400400{
Chuck Lever573c4e12010-12-14 14:58:11 +0000401 int error;
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400402
Chuck Lever573c4e12010-12-14 14:58:11 +0000403 error = desc->decode(xdr, entry, desc->plus);
404 if (error)
405 return error;
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400406 entry->fattr->time_start = desc->timestamp;
407 entry->fattr->gencount = desc->gencount;
408 return 0;
409}
410
Bryan Schumakerd39ab9d2010-09-24 18:50:01 -0400411static
412int nfs_same_file(struct dentry *dentry, struct nfs_entry *entry)
413{
Bryan Schumakerd39ab9d2010-09-24 18:50:01 -0400414 if (dentry->d_inode == NULL)
415 goto different;
Trond Myklebust37a09f02010-11-30 12:42:34 -0500416 if (nfs_compare_fh(entry->fh, NFS_FH(dentry->d_inode)) != 0)
Bryan Schumakerd39ab9d2010-09-24 18:50:01 -0400417 goto different;
418 return 1;
419different:
420 return 0;
421}
422
423static
Al Viro23db8622013-05-17 16:34:50 -0400424bool nfs_use_readdirplus(struct inode *dir, struct dir_context *ctx)
Trond Myklebustd69ee9b2012-05-01 17:37:59 -0400425{
426 if (!nfs_server_capable(dir, NFS_CAP_READDIRPLUS))
427 return false;
428 if (test_and_clear_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(dir)->flags))
429 return true;
Al Viro23db8622013-05-17 16:34:50 -0400430 if (ctx->pos == 0)
Trond Myklebustd69ee9b2012-05-01 17:37:59 -0400431 return true;
432 return false;
433}
434
435/*
436 * This function is called by the lookup code to request the use of
437 * readdirplus to accelerate any future lookups in the same
438 * directory.
439 */
440static
441void nfs_advise_use_readdirplus(struct inode *dir)
442{
443 set_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(dir)->flags);
444}
445
Trond Myklebust311324a2014-02-07 17:02:08 -0500446/*
447 * This function is mainly for use by nfs_getattr().
448 *
449 * If this is an 'ls -l', we want to force use of readdirplus.
450 * Do this by checking if there is an active file descriptor
451 * and calling nfs_advise_use_readdirplus, then forcing a
452 * cache flush.
453 */
454void nfs_force_use_readdirplus(struct inode *dir)
455{
456 if (!list_empty(&NFS_I(dir)->open_files)) {
457 nfs_advise_use_readdirplus(dir);
458 nfs_zap_mapping(dir, dir->i_mapping);
459 }
460}
461
Trond Myklebustd69ee9b2012-05-01 17:37:59 -0400462static
Bryan Schumakerd39ab9d2010-09-24 18:50:01 -0400463void nfs_prime_dcache(struct dentry *parent, struct nfs_entry *entry)
464{
Linus Torvalds26fe5752012-05-10 13:14:12 -0700465 struct qstr filename = QSTR_INIT(entry->name, entry->len);
Trond Myklebust4a201d62010-10-23 14:53:23 -0400466 struct dentry *dentry;
467 struct dentry *alias;
Bryan Schumakerd39ab9d2010-09-24 18:50:01 -0400468 struct inode *dir = parent->d_inode;
469 struct inode *inode;
David Quigleyaa9c2662013-05-22 12:50:44 -0400470 int status;
Bryan Schumakerd39ab9d2010-09-24 18:50:01 -0400471
Trond Myklebust4a201d62010-10-23 14:53:23 -0400472 if (filename.name[0] == '.') {
473 if (filename.len == 1)
474 return;
475 if (filename.len == 2 && filename.name[1] == '.')
476 return;
477 }
478 filename.hash = full_name_hash(filename.name, filename.len);
Bryan Schumakerd39ab9d2010-09-24 18:50:01 -0400479
Trond Myklebust4a201d62010-10-23 14:53:23 -0400480 dentry = d_lookup(parent, &filename);
Bryan Schumakerd39ab9d2010-09-24 18:50:01 -0400481 if (dentry != NULL) {
482 if (nfs_same_file(dentry, entry)) {
Jeff Laytoncda57a12013-07-04 06:35:23 -0400483 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
David Quigleyaa9c2662013-05-22 12:50:44 -0400484 status = nfs_refresh_inode(dentry->d_inode, entry->fattr);
485 if (!status)
486 nfs_setsecurity(dentry->d_inode, entry->fattr, entry->label);
Bryan Schumakerd39ab9d2010-09-24 18:50:01 -0400487 goto out;
488 } else {
Eric W. Biederman5542aa22014-02-13 09:46:25 -0800489 d_invalidate(dentry);
Bryan Schumakerd39ab9d2010-09-24 18:50:01 -0400490 dput(dentry);
491 }
492 }
493
494 dentry = d_alloc(parent, &filename);
Trond Myklebust4a201d62010-10-23 14:53:23 -0400495 if (dentry == NULL)
496 return;
497
David Quigley1775fd32013-05-22 12:50:42 -0400498 inode = nfs_fhget(dentry->d_sb, entry->fh, entry->fattr, entry->label);
Bryan Schumakerd39ab9d2010-09-24 18:50:01 -0400499 if (IS_ERR(inode))
500 goto out;
501
Al Viro41d28bc2014-10-12 22:24:21 -0400502 alias = d_splice_alias(inode, dentry);
Bryan Schumakerd39ab9d2010-09-24 18:50:01 -0400503 if (IS_ERR(alias))
504 goto out;
505 else if (alias) {
506 nfs_set_verifier(alias, nfs_save_change_attribute(dir));
507 dput(alias);
508 } else
509 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
510
511out:
512 dput(dentry);
Bryan Schumakerd39ab9d2010-09-24 18:50:01 -0400513}
514
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400515/* Perform conversion from xdr to cache array */
516static
Trond Myklebust8cd51a02010-11-15 20:26:22 -0500517int nfs_readdir_page_filler(nfs_readdir_descriptor_t *desc, struct nfs_entry *entry,
Trond Myklebust66502392011-01-08 17:45:38 -0500518 struct page **xdr_pages, struct page *page, unsigned int buflen)
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400519{
Bryan Schumakerbabddc72010-10-20 15:44:29 -0400520 struct xdr_stream stream;
Benny Halevyf7da7a12011-05-19 14:16:47 -0400521 struct xdr_buf buf;
Trond Myklebust66502392011-01-08 17:45:38 -0500522 struct page *scratch;
Bryan Schumaker99424382010-10-21 16:33:16 -0400523 struct nfs_cache_array *array;
Trond Myklebust5c346852010-11-20 12:43:45 -0500524 unsigned int count = 0;
525 int status;
Bryan Schumakerbabddc72010-10-20 15:44:29 -0400526
Trond Myklebust66502392011-01-08 17:45:38 -0500527 scratch = alloc_page(GFP_KERNEL);
528 if (scratch == NULL)
529 return -ENOMEM;
Bryan Schumakerbabddc72010-10-20 15:44:29 -0400530
Benny Halevyf7da7a12011-05-19 14:16:47 -0400531 xdr_init_decode_pages(&stream, &buf, xdr_pages, buflen);
Trond Myklebust66502392011-01-08 17:45:38 -0500532 xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE);
Bryan Schumaker99424382010-10-21 16:33:16 -0400533
534 do {
535 status = xdr_decode(desc, entry, &stream);
Trond Myklebust8cd51a02010-11-15 20:26:22 -0500536 if (status != 0) {
537 if (status == -EAGAIN)
538 status = 0;
Bryan Schumaker99424382010-10-21 16:33:16 -0400539 break;
Trond Myklebust8cd51a02010-11-15 20:26:22 -0500540 }
Bryan Schumaker99424382010-10-21 16:33:16 -0400541
Trond Myklebust5c346852010-11-20 12:43:45 -0500542 count++;
543
Trond Myklebust47c716c2010-12-07 12:44:56 -0500544 if (desc->plus != 0)
Bryan Schumakerd39ab9d2010-09-24 18:50:01 -0400545 nfs_prime_dcache(desc->file->f_path.dentry, entry);
Trond Myklebust8cd51a02010-11-15 20:26:22 -0500546
547 status = nfs_readdir_add_to_array(entry, page);
548 if (status != 0)
549 break;
Bryan Schumaker99424382010-10-21 16:33:16 -0400550 } while (!entry->eof);
551
Trond Myklebust47c716c2010-12-07 12:44:56 -0500552 if (count == 0 || (status == -EBADCOOKIE && entry->eof != 0)) {
Bryan Schumaker99424382010-10-21 16:33:16 -0400553 array = nfs_readdir_get_array(page);
Trond Myklebust8cd51a02010-11-15 20:26:22 -0500554 if (!IS_ERR(array)) {
555 array->eof_index = array->size;
556 status = 0;
557 nfs_readdir_release_array(page);
Trond Myklebust5c346852010-11-20 12:43:45 -0500558 } else
559 status = PTR_ERR(array);
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400560 }
Trond Myklebust66502392011-01-08 17:45:38 -0500561
562 put_page(scratch);
Trond Myklebust8cd51a02010-11-15 20:26:22 -0500563 return status;
Bryan Schumaker56e4ebf2010-10-20 15:44:37 -0400564}
565
566static
567void nfs_readdir_free_pagearray(struct page **pages, unsigned int npages)
568{
569 unsigned int i;
570 for (i = 0; i < npages; i++)
571 put_page(pages[i]);
572}
573
574static
575void nfs_readdir_free_large_page(void *ptr, struct page **pages,
576 unsigned int npages)
577{
Bryan Schumaker56e4ebf2010-10-20 15:44:37 -0400578 nfs_readdir_free_pagearray(pages, npages);
579}
580
581/*
582 * nfs_readdir_large_page will allocate pages that must be freed with a call
583 * to nfs_readdir_free_large_page
584 */
585static
Trond Myklebust66502392011-01-08 17:45:38 -0500586int nfs_readdir_large_page(struct page **pages, unsigned int npages)
Bryan Schumaker56e4ebf2010-10-20 15:44:37 -0400587{
Bryan Schumaker56e4ebf2010-10-20 15:44:37 -0400588 unsigned int i;
589
590 for (i = 0; i < npages; i++) {
591 struct page *page = alloc_page(GFP_KERNEL);
592 if (page == NULL)
593 goto out_freepages;
594 pages[i] = page;
595 }
Trond Myklebust66502392011-01-08 17:45:38 -0500596 return 0;
Bryan Schumaker56e4ebf2010-10-20 15:44:37 -0400597
Bryan Schumaker56e4ebf2010-10-20 15:44:37 -0400598out_freepages:
599 nfs_readdir_free_pagearray(pages, i);
Trond Myklebust66502392011-01-08 17:45:38 -0500600 return -ENOMEM;
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400601}
602
603static
604int nfs_readdir_xdr_to_array(nfs_readdir_descriptor_t *desc, struct page *page, struct inode *inode)
605{
Bryan Schumaker56e4ebf2010-10-20 15:44:37 -0400606 struct page *pages[NFS_MAX_READDIR_PAGES];
607 void *pages_ptr = NULL;
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400608 struct nfs_entry entry;
609 struct file *file = desc->file;
610 struct nfs_cache_array *array;
Trond Myklebust8cd51a02010-11-15 20:26:22 -0500611 int status = -ENOMEM;
Bryan Schumaker56e4ebf2010-10-20 15:44:37 -0400612 unsigned int array_size = ARRAY_SIZE(pages);
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400613
614 entry.prev_cookie = 0;
Trond Myklebust0aded702010-11-30 21:56:32 -0500615 entry.cookie = desc->last_cookie;
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400616 entry.eof = 0;
617 entry.fh = nfs_alloc_fhandle();
618 entry.fattr = nfs_alloc_fattr();
Chuck Lever573c4e12010-12-14 14:58:11 +0000619 entry.server = NFS_SERVER(inode);
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400620 if (entry.fh == NULL || entry.fattr == NULL)
621 goto out;
622
David Quigley14c43f72013-05-22 12:50:43 -0400623 entry.label = nfs4_label_alloc(NFS_SERVER(inode), GFP_NOWAIT);
624 if (IS_ERR(entry.label)) {
625 status = PTR_ERR(entry.label);
626 goto out;
627 }
628
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400629 array = nfs_readdir_get_array(page);
Trond Myklebust8cd51a02010-11-15 20:26:22 -0500630 if (IS_ERR(array)) {
631 status = PTR_ERR(array);
David Quigley14c43f72013-05-22 12:50:43 -0400632 goto out_label_free;
Trond Myklebust8cd51a02010-11-15 20:26:22 -0500633 }
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400634 memset(array, 0, sizeof(struct nfs_cache_array));
635 array->eof_index = -1;
636
Trond Myklebust66502392011-01-08 17:45:38 -0500637 status = nfs_readdir_large_page(pages, array_size);
638 if (status < 0)
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400639 goto out_release_array;
640 do {
Trond Myklebustac396122010-11-15 20:26:22 -0500641 unsigned int pglen;
Bryan Schumaker56e4ebf2010-10-20 15:44:37 -0400642 status = nfs_readdir_xdr_filler(pages, desc, &entry, file, inode);
Bryan Schumakerbabddc72010-10-20 15:44:29 -0400643
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400644 if (status < 0)
645 break;
Trond Myklebustac396122010-11-15 20:26:22 -0500646 pglen = status;
Trond Myklebust66502392011-01-08 17:45:38 -0500647 status = nfs_readdir_page_filler(desc, &entry, pages, page, pglen);
Trond Myklebust8cd51a02010-11-15 20:26:22 -0500648 if (status < 0) {
649 if (status == -ENOSPC)
650 status = 0;
651 break;
652 }
653 } while (array->eof_index < 0);
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400654
Bryan Schumaker56e4ebf2010-10-20 15:44:37 -0400655 nfs_readdir_free_large_page(pages_ptr, pages, array_size);
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400656out_release_array:
657 nfs_readdir_release_array(page);
David Quigley14c43f72013-05-22 12:50:43 -0400658out_label_free:
659 nfs4_label_free(entry.label);
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400660out:
661 nfs_free_fattr(entry.fattr);
662 nfs_free_fhandle(entry.fh);
663 return status;
664}
665
666/*
667 * Now we cache directories properly, by converting xdr information
668 * to an array that can be used for lookups later. This results in
669 * fewer cache pages, since we can store more information on each page.
670 * We only need to convert from xdr once so future lookups are much simpler
671 */
672static
673int nfs_readdir_filler(nfs_readdir_descriptor_t *desc, struct page* page)
674{
Al Viro496ad9a2013-01-23 17:07:38 -0500675 struct inode *inode = file_inode(desc->file);
Trond Myklebust8cd51a02010-11-15 20:26:22 -0500676 int ret;
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400677
Trond Myklebust8cd51a02010-11-15 20:26:22 -0500678 ret = nfs_readdir_xdr_to_array(desc, page, inode);
679 if (ret < 0)
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400680 goto error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700681 SetPageUptodate(page);
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400682
Trond Myklebust2aac05a2008-07-07 13:26:10 -0400683 if (invalidate_inode_pages2_range(inode->i_mapping, page->index + 1, -1) < 0) {
Trond Myklebustcd9ae2b2006-10-19 23:28:40 -0700684 /* Should never happen */
685 nfs_zap_mapping(inode, inode->i_mapping);
686 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700687 unlock_page(page);
688 return 0;
689 error:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700690 unlock_page(page);
Trond Myklebust8cd51a02010-11-15 20:26:22 -0500691 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700692}
693
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400694static
695void cache_page_release(nfs_readdir_descriptor_t *desc)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700696{
Trond Myklebust11de3b12010-12-01 14:17:06 -0500697 if (!desc->page->mapping)
698 nfs_readdir_clear_array(desc->page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700699 page_cache_release(desc->page);
700 desc->page = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700701}
702
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400703static
704struct page *get_cache_page(nfs_readdir_descriptor_t *desc)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700705{
Al Viro496ad9a2013-01-23 17:07:38 -0500706 return read_cache_page(file_inode(desc->file)->i_mapping,
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400707 desc->page_index, (filler_t *)nfs_readdir_filler, desc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700708}
709
710/*
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400711 * Returns 0 if desc->dir_cookie was found on page desc->page_index
Olivier Galibert00a92642005-06-22 17:16:29 +0000712 */
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400713static
714int find_cache_page(nfs_readdir_descriptor_t *desc)
Olivier Galibert00a92642005-06-22 17:16:29 +0000715{
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400716 int res;
Olivier Galibert00a92642005-06-22 17:16:29 +0000717
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400718 desc->page = get_cache_page(desc);
719 if (IS_ERR(desc->page))
720 return PTR_ERR(desc->page);
Olivier Galibert00a92642005-06-22 17:16:29 +0000721
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400722 res = nfs_readdir_search_array(desc);
Trond Myklebust47c716c2010-12-07 12:44:56 -0500723 if (res != 0)
724 cache_page_release(desc);
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400725 return res;
Olivier Galibert00a92642005-06-22 17:16:29 +0000726}
727
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400728/* Search for desc->dir_cookie from the beginning of the page cache */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700729static inline
730int readdir_search_pagecache(nfs_readdir_descriptor_t *desc)
731{
Trond Myklebust8cd51a02010-11-15 20:26:22 -0500732 int res;
Olivier Galibert00a92642005-06-22 17:16:29 +0000733
Trond Myklebust0aded702010-11-30 21:56:32 -0500734 if (desc->page_index == 0) {
Trond Myklebust8cd51a02010-11-15 20:26:22 -0500735 desc->current_index = 0;
Trond Myklebust0aded702010-11-30 21:56:32 -0500736 desc->last_cookie = 0;
737 }
Trond Myklebust47c716c2010-12-07 12:44:56 -0500738 do {
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400739 res = find_cache_page(desc);
Trond Myklebust47c716c2010-12-07 12:44:56 -0500740 } while (res == -EAGAIN);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700741 return res;
742}
743
Linus Torvalds1da177e2005-04-16 15:20:36 -0700744/*
745 * Once we've found the start of the dirent within a page: fill 'er up...
746 */
747static
Al Viro23db8622013-05-17 16:34:50 -0400748int nfs_do_filldir(nfs_readdir_descriptor_t *desc)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700749{
750 struct file *file = desc->file;
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400751 int i = 0;
752 int res = 0;
753 struct nfs_cache_array *array = NULL;
Bryan Schumaker8ef2ce32011-03-23 15:04:31 -0400754 struct nfs_open_dir_context *ctx = file->private_data;
755
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400756 array = nfs_readdir_get_array(desc->page);
Trond Myklebuste7c58e92010-11-20 13:22:24 -0500757 if (IS_ERR(array)) {
758 res = PTR_ERR(array);
759 goto out;
760 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700761
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400762 for (i = desc->cache_entry_index; i < array->size; i++) {
Trond Myklebustece0b422010-11-20 13:55:33 -0500763 struct nfs_cache_array_entry *ent;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700764
Trond Myklebustece0b422010-11-20 13:55:33 -0500765 ent = &array->array[i];
Al Viro23db8622013-05-17 16:34:50 -0400766 if (!dir_emit(desc->ctx, ent->string.name, ent->string.len,
767 nfs_compat_user_ino64(ent->ino), ent->d_type)) {
Trond Myklebustece0b422010-11-20 13:55:33 -0500768 desc->eof = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700769 break;
Trond Myklebustece0b422010-11-20 13:55:33 -0500770 }
Al Viro23db8622013-05-17 16:34:50 -0400771 desc->ctx->pos++;
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400772 if (i < (array->size-1))
773 *desc->dir_cookie = array->array[i+1].cookie;
774 else
775 *desc->dir_cookie = array->last_cookie;
Trond Myklebust0c030802011-07-30 12:45:35 -0400776 if (ctx->duped != 0)
777 ctx->duped = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700778 }
Trond Myklebust47c716c2010-12-07 12:44:56 -0500779 if (array->eof_index >= 0)
Trond Myklebust8cd51a02010-11-15 20:26:22 -0500780 desc->eof = 1;
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400781
782 nfs_readdir_release_array(desc->page);
Trond Myklebuste7c58e92010-11-20 13:22:24 -0500783out:
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400784 cache_page_release(desc);
Chuck Lever1e7cb3d2006-03-20 13:44:24 -0500785 dfprintk(DIRCACHE, "NFS: nfs_do_filldir() filling ended @ cookie %Lu; returning = %d\n",
786 (unsigned long long)*desc->dir_cookie, res);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700787 return res;
788}
789
790/*
791 * If we cannot find a cookie in our cache, we suspect that this is
792 * because it points to a deleted file, so we ask the server to return
793 * whatever it thinks is the next entry. We then feed this to filldir.
794 * If all goes well, we should then be able to find our way round the
795 * cache on the next call to readdir_search_pagecache();
796 *
797 * NOTE: we cannot add the anonymous page to the pagecache because
798 * the data it contains might not be page aligned. Besides,
799 * we should already have a complete representation of the
800 * directory in the page cache by the time we get here.
801 */
802static inline
Al Viro23db8622013-05-17 16:34:50 -0400803int uncached_readdir(nfs_readdir_descriptor_t *desc)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700804{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700805 struct page *page = NULL;
806 int status;
Al Viro496ad9a2013-01-23 17:07:38 -0500807 struct inode *inode = file_inode(desc->file);
Trond Myklebust0c030802011-07-30 12:45:35 -0400808 struct nfs_open_dir_context *ctx = desc->file->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700809
Chuck Lever1e7cb3d2006-03-20 13:44:24 -0500810 dfprintk(DIRCACHE, "NFS: uncached_readdir() searching for cookie %Lu\n",
811 (unsigned long long)*desc->dir_cookie);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700812
813 page = alloc_page(GFP_HIGHUSER);
814 if (!page) {
815 status = -ENOMEM;
816 goto out;
817 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700818
Trond Myklebust7a8e1dc2010-11-20 13:24:46 -0500819 desc->page_index = 0;
Trond Myklebust0aded702010-11-30 21:56:32 -0500820 desc->last_cookie = *desc->dir_cookie;
Trond Myklebust7a8e1dc2010-11-20 13:24:46 -0500821 desc->page = page;
Trond Myklebust0c030802011-07-30 12:45:35 -0400822 ctx->duped = 0;
Trond Myklebust7a8e1dc2010-11-20 13:24:46 -0500823
Trond Myklebust85f86072010-11-20 13:24:49 -0500824 status = nfs_readdir_xdr_to_array(desc, page, inode);
825 if (status < 0)
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400826 goto out_release;
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400827
Al Viro23db8622013-05-17 16:34:50 -0400828 status = nfs_do_filldir(desc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700829
Linus Torvalds1da177e2005-04-16 15:20:36 -0700830 out:
Chuck Lever1e7cb3d2006-03-20 13:44:24 -0500831 dfprintk(DIRCACHE, "NFS: %s: returns %d\n",
Harvey Harrison3110ff82008-05-02 13:42:44 -0700832 __func__, status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700833 return status;
834 out_release:
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400835 cache_page_release(desc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700836 goto out;
837}
838
Trond Myklebust311324a2014-02-07 17:02:08 -0500839static bool nfs_dir_mapping_need_revalidate(struct inode *dir)
840{
841 struct nfs_inode *nfsi = NFS_I(dir);
842
843 if (nfs_attribute_cache_expired(dir))
844 return true;
845 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
846 return true;
847 return false;
848}
849
Olivier Galibert00a92642005-06-22 17:16:29 +0000850/* The file offset position represents the dirent entry number. A
851 last cookie cache takes care of the common case of reading the
852 whole directory.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700853 */
Al Viro23db8622013-05-17 16:34:50 -0400854static int nfs_readdir(struct file *file, struct dir_context *ctx)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700855{
Al Viro23db8622013-05-17 16:34:50 -0400856 struct dentry *dentry = file->f_path.dentry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700857 struct inode *inode = dentry->d_inode;
858 nfs_readdir_descriptor_t my_desc,
859 *desc = &my_desc;
Al Viro23db8622013-05-17 16:34:50 -0400860 struct nfs_open_dir_context *dir_ctx = file->private_data;
Scott Mayhew07b5ce82013-07-05 17:49:31 -0400861 int res = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700862
Al Viro6de14722013-09-16 10:53:17 -0400863 dfprintk(FILE, "NFS: readdir(%pD2) starting at cookie %llu\n",
864 file, (long long)ctx->pos);
Chuck Lever91d5b472006-03-20 13:44:14 -0500865 nfs_inc_stats(inode, NFSIOS_VFSGETDENTS);
866
Linus Torvalds1da177e2005-04-16 15:20:36 -0700867 /*
Al Viro23db8622013-05-17 16:34:50 -0400868 * ctx->pos points to the dirent entry number.
Trond Myklebustf0dd2132005-06-22 17:16:29 +0000869 * *desc->dir_cookie has the cookie for the next entry. We have
Olivier Galibert00a92642005-06-22 17:16:29 +0000870 * to either find the entry with the appropriate number or
871 * revalidate the cookie.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700872 */
873 memset(desc, 0, sizeof(*desc));
874
Al Viro23db8622013-05-17 16:34:50 -0400875 desc->file = file;
876 desc->ctx = ctx;
Bryan Schumaker480c2002011-03-23 14:48:29 -0400877 desc->dir_cookie = &dir_ctx->dir_cookie;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700878 desc->decode = NFS_PROTO(inode)->decode_dirent;
Al Viro23db8622013-05-17 16:34:50 -0400879 desc->plus = nfs_use_readdirplus(inode, ctx) ? 1 : 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700880
Trond Myklebust565277f2007-10-15 18:17:53 -0400881 nfs_block_sillyrename(dentry);
Trond Myklebust311324a2014-02-07 17:02:08 -0500882 if (ctx->pos == 0 || nfs_dir_mapping_need_revalidate(inode))
Scott Mayhew07b5ce82013-07-05 17:49:31 -0400883 res = nfs_revalidate_mapping(inode, file->f_mapping);
Trond Myklebustfccca7f2008-01-26 17:37:47 -0500884 if (res < 0)
885 goto out;
886
Trond Myklebust47c716c2010-12-07 12:44:56 -0500887 do {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700888 res = readdir_search_pagecache(desc);
Olivier Galibert00a92642005-06-22 17:16:29 +0000889
Linus Torvalds1da177e2005-04-16 15:20:36 -0700890 if (res == -EBADCOOKIE) {
Trond Myklebustece0b422010-11-20 13:55:33 -0500891 res = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700892 /* This means either end of directory */
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400893 if (*desc->dir_cookie && desc->eof == 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700894 /* Or that the server has 'lost' a cookie */
Al Viro23db8622013-05-17 16:34:50 -0400895 res = uncached_readdir(desc);
Trond Myklebustece0b422010-11-20 13:55:33 -0500896 if (res == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700897 continue;
898 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700899 break;
900 }
901 if (res == -ETOOSMALL && desc->plus) {
Benny Halevy3a10c302008-01-23 08:58:59 +0200902 clear_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(inode)->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700903 nfs_zap_caches(inode);
Trond Myklebustbaf57a02010-09-24 18:49:43 -0400904 desc->page_index = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700905 desc->plus = 0;
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400906 desc->eof = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700907 continue;
908 }
909 if (res < 0)
910 break;
911
Al Viro23db8622013-05-17 16:34:50 -0400912 res = nfs_do_filldir(desc);
Trond Myklebustece0b422010-11-20 13:55:33 -0500913 if (res < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700914 break;
Trond Myklebust47c716c2010-12-07 12:44:56 -0500915 } while (!desc->eof);
Trond Myklebustfccca7f2008-01-26 17:37:47 -0500916out:
Trond Myklebust565277f2007-10-15 18:17:53 -0400917 nfs_unblock_sillyrename(dentry);
Chuck Lever1e7cb3d2006-03-20 13:44:24 -0500918 if (res > 0)
919 res = 0;
Al Viro6de14722013-09-16 10:53:17 -0400920 dfprintk(FILE, "NFS: readdir(%pD2) returns %d\n", file, res);
Chuck Lever1e7cb3d2006-03-20 13:44:24 -0500921 return res;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700922}
923
Andrew Morton965c8e52012-12-17 15:59:39 -0800924static loff_t nfs_llseek_dir(struct file *filp, loff_t offset, int whence)
Trond Myklebustf0dd2132005-06-22 17:16:29 +0000925{
Al Viro6de14722013-09-16 10:53:17 -0400926 struct inode *inode = file_inode(filp);
Bryan Schumaker480c2002011-03-23 14:48:29 -0400927 struct nfs_open_dir_context *dir_ctx = filp->private_data;
Chuck Leverb84e06c2008-06-11 17:55:34 -0400928
Al Viro6de14722013-09-16 10:53:17 -0400929 dfprintk(FILE, "NFS: llseek dir(%pD2, %lld, %d)\n",
930 filp, offset, whence);
Chuck Leverb84e06c2008-06-11 17:55:34 -0400931
932 mutex_lock(&inode->i_mutex);
Andrew Morton965c8e52012-12-17 15:59:39 -0800933 switch (whence) {
Trond Myklebustf0dd2132005-06-22 17:16:29 +0000934 case 1:
935 offset += filp->f_pos;
936 case 0:
937 if (offset >= 0)
938 break;
939 default:
940 offset = -EINVAL;
941 goto out;
942 }
943 if (offset != filp->f_pos) {
944 filp->f_pos = offset;
Bryan Schumaker480c2002011-03-23 14:48:29 -0400945 dir_ctx->dir_cookie = 0;
Bryan Schumaker8ef2ce32011-03-23 15:04:31 -0400946 dir_ctx->duped = 0;
Trond Myklebustf0dd2132005-06-22 17:16:29 +0000947 }
948out:
Chuck Leverb84e06c2008-06-11 17:55:34 -0400949 mutex_unlock(&inode->i_mutex);
Trond Myklebustf0dd2132005-06-22 17:16:29 +0000950 return offset;
951}
952
Linus Torvalds1da177e2005-04-16 15:20:36 -0700953/*
954 * All directory operations under NFS are synchronous, so fsync()
955 * is a dummy operation.
956 */
Josef Bacik02c24a82011-07-16 20:44:56 -0400957static int nfs_fsync_dir(struct file *filp, loff_t start, loff_t end,
958 int datasync)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700959{
Al Viro6de14722013-09-16 10:53:17 -0400960 struct inode *inode = file_inode(filp);
Christoph Hellwig7ea80852010-05-26 17:53:25 +0200961
Al Viro6de14722013-09-16 10:53:17 -0400962 dfprintk(FILE, "NFS: fsync dir(%pD2) datasync %d\n", filp, datasync);
Chuck Lever1e7cb3d2006-03-20 13:44:24 -0500963
Josef Bacik02c24a82011-07-16 20:44:56 -0400964 mutex_lock(&inode->i_mutex);
Al Viro6de14722013-09-16 10:53:17 -0400965 nfs_inc_stats(inode, NFSIOS_VFSFSYNC);
Josef Bacik02c24a82011-07-16 20:44:56 -0400966 mutex_unlock(&inode->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700967 return 0;
968}
969
Trond Myklebustbfc69a42007-10-15 18:18:29 -0400970/**
971 * nfs_force_lookup_revalidate - Mark the directory as having changed
972 * @dir - pointer to directory inode
973 *
974 * This forces the revalidation code in nfs_lookup_revalidate() to do a
975 * full lookup on all child dentries of 'dir' whenever a change occurs
976 * on the server that might have invalidated our dcache.
977 *
978 * The caller should be holding dir->i_lock
979 */
980void nfs_force_lookup_revalidate(struct inode *dir)
981{
Trond Myklebust011935a2008-10-14 19:24:50 -0400982 NFS_I(dir)->cache_change_attribute++;
Trond Myklebustbfc69a42007-10-15 18:18:29 -0400983}
Bryan Schumaker89d77c82012-07-30 16:05:25 -0400984EXPORT_SYMBOL_GPL(nfs_force_lookup_revalidate);
Trond Myklebustbfc69a42007-10-15 18:18:29 -0400985
Linus Torvalds1da177e2005-04-16 15:20:36 -0700986/*
987 * A check for whether or not the parent directory has changed.
988 * In the case it has, we assume that the dentries are untrustworthy
989 * and may need to be looked up again.
NeilBrown912a1082014-07-14 11:28:20 +1000990 * If rcu_walk prevents us from performing a full check, return 0.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700991 */
NeilBrown912a1082014-07-14 11:28:20 +1000992static int nfs_check_verifier(struct inode *dir, struct dentry *dentry,
993 int rcu_walk)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700994{
NeilBrown912a1082014-07-14 11:28:20 +1000995 int ret;
996
Linus Torvalds1da177e2005-04-16 15:20:36 -0700997 if (IS_ROOT(dentry))
998 return 1;
Trond Myklebust4eec9522008-07-15 17:58:13 -0400999 if (NFS_SERVER(dir)->flags & NFS_MOUNT_LOOKUP_CACHE_NONE)
1000 return 0;
Trond Myklebustf2c77f42007-10-02 12:54:39 -04001001 if (!nfs_verify_change_attribute(dir, dentry->d_time))
1002 return 0;
1003 /* Revalidate nfsi->cache_change_attribute before we declare a match */
NeilBrown912a1082014-07-14 11:28:20 +10001004 if (rcu_walk)
1005 ret = nfs_revalidate_inode_rcu(NFS_SERVER(dir), dir);
1006 else
1007 ret = nfs_revalidate_inode(NFS_SERVER(dir), dir);
1008 if (ret < 0)
Trond Myklebustf2c77f42007-10-02 12:54:39 -04001009 return 0;
1010 if (!nfs_verify_change_attribute(dir, dentry->d_time))
1011 return 0;
1012 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001013}
1014
Linus Torvalds1da177e2005-04-16 15:20:36 -07001015/*
Trond Myklebusta12802c2007-10-02 19:13:04 -04001016 * Use intent information to check whether or not we're going to do
1017 * an O_EXCL create using this path component.
1018 */
Al Virofa3c56b2012-06-10 15:36:40 -04001019static int nfs_is_exclusive_create(struct inode *dir, unsigned int flags)
Trond Myklebusta12802c2007-10-02 19:13:04 -04001020{
1021 if (NFS_PROTO(dir)->version == 2)
1022 return 0;
Al Virofa3c56b2012-06-10 15:36:40 -04001023 return flags & LOOKUP_EXCL;
Trond Myklebusta12802c2007-10-02 19:13:04 -04001024}
1025
1026/*
Trond Myklebust1d6757f2005-06-07 18:37:01 -04001027 * Inode and filehandle revalidation for lookups.
1028 *
1029 * We force revalidation in the cases where the VFS sets LOOKUP_REVAL,
1030 * or if the intent information indicates that we're about to open this
1031 * particular file and the "nocto" mount flag is not set.
1032 *
1033 */
Trond Myklebust65a0c142012-12-14 17:51:40 -05001034static
Al Virofa3c56b2012-06-10 15:36:40 -04001035int nfs_lookup_verify_inode(struct inode *inode, unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001036{
1037 struct nfs_server *server = NFS_SERVER(inode);
Trond Myklebust65a0c142012-12-14 17:51:40 -05001038 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001039
David Howells36d43a42011-01-14 18:45:42 +00001040 if (IS_AUTOMOUNT(inode))
Trond Myklebust4e99a1f2008-03-06 12:34:59 -05001041 return 0;
Al Virofacc3532012-06-10 15:33:51 -04001042 /* VFS wants an on-the-wire revalidation */
Al Virofa3c56b2012-06-10 15:36:40 -04001043 if (flags & LOOKUP_REVAL)
Al Virofacc3532012-06-10 15:33:51 -04001044 goto out_force;
1045 /* This is an open(2) */
Al Virofa3c56b2012-06-10 15:36:40 -04001046 if ((flags & LOOKUP_OPEN) && !(server->flags & NFS_MOUNT_NOCTO) &&
1047 (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)))
Al Virofacc3532012-06-10 15:33:51 -04001048 goto out_force;
Trond Myklebust65a0c142012-12-14 17:51:40 -05001049out:
1050 return (inode->i_nlink == 0) ? -ENOENT : 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001051out_force:
NeilBrown1fa1e382014-07-14 11:28:20 +10001052 if (flags & LOOKUP_RCU)
1053 return -ECHILD;
Trond Myklebust65a0c142012-12-14 17:51:40 -05001054 ret = __nfs_revalidate_inode(server, inode);
1055 if (ret != 0)
1056 return ret;
1057 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001058}
1059
1060/*
1061 * We judge how long we want to trust negative
1062 * dentries by looking at the parent inode mtime.
1063 *
1064 * If parent mtime has changed, we revalidate, else we wait for a
1065 * period corresponding to the parent's attribute cache timeout value.
NeilBrown912a1082014-07-14 11:28:20 +10001066 *
1067 * If LOOKUP_RCU prevents us from performing a full check, return 1
1068 * suggesting a reval is needed.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001069 */
1070static inline
1071int nfs_neg_need_reval(struct inode *dir, struct dentry *dentry,
Al Virofa3c56b2012-06-10 15:36:40 -04001072 unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001073{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001074 /* Don't revalidate a negative dentry if we're creating a new file */
Al Virofa3c56b2012-06-10 15:36:40 -04001075 if (flags & LOOKUP_CREATE)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001076 return 0;
Trond Myklebust4eec9522008-07-15 17:58:13 -04001077 if (NFS_SERVER(dir)->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG)
1078 return 1;
NeilBrown912a1082014-07-14 11:28:20 +10001079 return !nfs_check_verifier(dir, dentry, flags & LOOKUP_RCU);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001080}
1081
1082/*
1083 * This is called every time the dcache has a lookup hit,
1084 * and we should check whether we can really trust that
1085 * lookup.
1086 *
1087 * NOTE! The hit can be a negative hit too, don't assume
1088 * we have an inode!
1089 *
1090 * If the parent directory is seen to have changed, we throw out the
1091 * cached dentry and do a new lookup.
1092 */
Al Viro0b728e12012-06-10 16:03:43 -04001093static int nfs_lookup_revalidate(struct dentry *dentry, unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001094{
1095 struct inode *dir;
1096 struct inode *inode;
1097 struct dentry *parent;
Trond Myklebuste1fb4d02010-04-16 16:22:47 -04001098 struct nfs_fh *fhandle = NULL;
1099 struct nfs_fattr *fattr = NULL;
David Quigley1775fd32013-05-22 12:50:42 -04001100 struct nfs4_label *label = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001101 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001102
NeilBrownd51ac1a2014-07-14 11:28:20 +10001103 if (flags & LOOKUP_RCU) {
NeilBrown50d77732014-08-04 16:24:00 +10001104 parent = ACCESS_ONCE(dentry->d_parent);
NeilBrownd51ac1a2014-07-14 11:28:20 +10001105 dir = ACCESS_ONCE(parent->d_inode);
1106 if (!dir)
1107 return -ECHILD;
1108 } else {
1109 parent = dget_parent(dentry);
1110 dir = parent->d_inode;
1111 }
Chuck Lever91d5b472006-03-20 13:44:14 -05001112 nfs_inc_stats(dir, NFSIOS_DENTRYREVALIDATE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001113 inode = dentry->d_inode;
1114
1115 if (!inode) {
NeilBrown912a1082014-07-14 11:28:20 +10001116 if (nfs_neg_need_reval(dir, dentry, flags)) {
1117 if (flags & LOOKUP_RCU)
1118 return -ECHILD;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001119 goto out_bad;
NeilBrown912a1082014-07-14 11:28:20 +10001120 }
Trond Myklebustd69ee9b2012-05-01 17:37:59 -04001121 goto out_valid_noent;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001122 }
1123
1124 if (is_bad_inode(inode)) {
NeilBrownd51ac1a2014-07-14 11:28:20 +10001125 if (flags & LOOKUP_RCU)
1126 return -ECHILD;
Al Viro6de14722013-09-16 10:53:17 -04001127 dfprintk(LOOKUPCACHE, "%s: %pd2 has dud inode\n",
1128 __func__, dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001129 goto out_bad;
1130 }
1131
Bryan Schumaker011e2a72012-06-20 15:53:43 -04001132 if (NFS_PROTO(dir)->have_delegation(inode, FMODE_READ))
Trond Myklebust15860ab2008-12-23 15:21:54 -05001133 goto out_set_verifier;
1134
Linus Torvalds1da177e2005-04-16 15:20:36 -07001135 /* Force a full look up iff the parent directory has changed */
NeilBrown912a1082014-07-14 11:28:20 +10001136 if (!nfs_is_exclusive_create(dir, flags) &&
1137 nfs_check_verifier(dir, dentry, flags & LOOKUP_RCU)) {
1138
NeilBrown1fa1e382014-07-14 11:28:20 +10001139 if (nfs_lookup_verify_inode(inode, flags)) {
1140 if (flags & LOOKUP_RCU)
1141 return -ECHILD;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001142 goto out_zap_parent;
NeilBrown1fa1e382014-07-14 11:28:20 +10001143 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001144 goto out_valid;
1145 }
1146
NeilBrown912a1082014-07-14 11:28:20 +10001147 if (flags & LOOKUP_RCU)
1148 return -ECHILD;
1149
Linus Torvalds1da177e2005-04-16 15:20:36 -07001150 if (NFS_STALE(inode))
1151 goto out_bad;
1152
Trond Myklebuste1fb4d02010-04-16 16:22:47 -04001153 error = -ENOMEM;
1154 fhandle = nfs_alloc_fhandle();
1155 fattr = nfs_alloc_fattr();
1156 if (fhandle == NULL || fattr == NULL)
1157 goto out_error;
1158
David Quigley14c43f72013-05-22 12:50:43 -04001159 label = nfs4_label_alloc(NFS_SERVER(inode), GFP_NOWAIT);
1160 if (IS_ERR(label))
1161 goto out_error;
1162
Trond Myklebust6e0d0be2013-08-20 11:26:17 -04001163 trace_nfs_lookup_revalidate_enter(dir, dentry, flags);
David Quigley1775fd32013-05-22 12:50:42 -04001164 error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, fhandle, fattr, label);
Trond Myklebust6e0d0be2013-08-20 11:26:17 -04001165 trace_nfs_lookup_revalidate_exit(dir, dentry, flags, error);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001166 if (error)
1167 goto out_bad;
Trond Myklebuste1fb4d02010-04-16 16:22:47 -04001168 if (nfs_compare_fh(NFS_FH(inode), fhandle))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001169 goto out_bad;
Trond Myklebuste1fb4d02010-04-16 16:22:47 -04001170 if ((error = nfs_refresh_inode(inode, fattr)) != 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001171 goto out_bad;
1172
David Quigleyaa9c2662013-05-22 12:50:44 -04001173 nfs_setsecurity(inode, fattr, label);
1174
Trond Myklebuste1fb4d02010-04-16 16:22:47 -04001175 nfs_free_fattr(fattr);
1176 nfs_free_fhandle(fhandle);
David Quigley14c43f72013-05-22 12:50:43 -04001177 nfs4_label_free(label);
1178
Trond Myklebust15860ab2008-12-23 15:21:54 -05001179out_set_verifier:
Trond Myklebustcf8ba452007-10-01 13:46:53 -04001180 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001181 out_valid:
Trond Myklebustd69ee9b2012-05-01 17:37:59 -04001182 /* Success: notify readdir to use READDIRPLUS */
1183 nfs_advise_use_readdirplus(dir);
1184 out_valid_noent:
NeilBrownd51ac1a2014-07-14 11:28:20 +10001185 if (flags & LOOKUP_RCU) {
NeilBrown50d77732014-08-04 16:24:00 +10001186 if (parent != ACCESS_ONCE(dentry->d_parent))
NeilBrownd51ac1a2014-07-14 11:28:20 +10001187 return -ECHILD;
1188 } else
1189 dput(parent);
Al Viro6de14722013-09-16 10:53:17 -04001190 dfprintk(LOOKUPCACHE, "NFS: %s(%pd2) is valid\n",
1191 __func__, dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001192 return 1;
1193out_zap_parent:
1194 nfs_zap_caches(dir);
1195 out_bad:
NeilBrownd51ac1a2014-07-14 11:28:20 +10001196 WARN_ON(flags & LOOKUP_RCU);
Al Viroc44600c2012-11-29 22:04:36 -05001197 nfs_free_fattr(fattr);
1198 nfs_free_fhandle(fhandle);
David Quigley14c43f72013-05-22 12:50:43 -04001199 nfs4_label_free(label);
Trond Myklebusta1643a92007-09-29 17:25:43 -04001200 nfs_mark_for_revalidate(dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001201 if (inode && S_ISDIR(inode->i_mode)) {
1202 /* Purge readdir caches. */
1203 nfs_zap_caches(inode);
J. Bruce Fieldsa3f432b2013-10-15 17:03:16 -04001204 /*
1205 * We can't d_drop the root of a disconnected tree:
1206 * its d_hash is on the s_anon list and d_drop() would hide
1207 * it from shrink_dcache_for_unmount(), leading to busy
1208 * inodes on unmount and further oopses.
1209 */
1210 if (IS_ROOT(dentry))
Al Virod9e80b72010-04-29 03:10:43 +01001211 goto out_valid;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001212 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001213 dput(parent);
Al Viro6de14722013-09-16 10:53:17 -04001214 dfprintk(LOOKUPCACHE, "NFS: %s(%pd2) is invalid\n",
1215 __func__, dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001216 return 0;
Trond Myklebuste1fb4d02010-04-16 16:22:47 -04001217out_error:
NeilBrownd51ac1a2014-07-14 11:28:20 +10001218 WARN_ON(flags & LOOKUP_RCU);
Trond Myklebuste1fb4d02010-04-16 16:22:47 -04001219 nfs_free_fattr(fattr);
1220 nfs_free_fhandle(fhandle);
David Quigley14c43f72013-05-22 12:50:43 -04001221 nfs4_label_free(label);
Trond Myklebuste1fb4d02010-04-16 16:22:47 -04001222 dput(parent);
Al Viro6de14722013-09-16 10:53:17 -04001223 dfprintk(LOOKUPCACHE, "NFS: %s(%pd2) lookup returned error %d\n",
1224 __func__, dentry, error);
Trond Myklebuste1fb4d02010-04-16 16:22:47 -04001225 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001226}
1227
1228/*
Jeff Laytonecf3d1f2013-02-20 11:19:05 -05001229 * A weaker form of d_revalidate for revalidating just the dentry->d_inode
1230 * when we don't really care about the dentry name. This is called when a
1231 * pathwalk ends on a dentry that was not found via a normal lookup in the
1232 * parent dir (e.g.: ".", "..", procfs symlinks or mountpoint traversals).
1233 *
1234 * In this situation, we just want to verify that the inode itself is OK
1235 * since the dentry might have changed on the server.
1236 */
1237static int nfs_weak_revalidate(struct dentry *dentry, unsigned int flags)
1238{
1239 int error;
1240 struct inode *inode = dentry->d_inode;
1241
1242 /*
1243 * I believe we can only get a negative dentry here in the case of a
1244 * procfs-style symlink. Just assume it's correct for now, but we may
1245 * eventually need to do something more here.
1246 */
1247 if (!inode) {
Al Viro6de14722013-09-16 10:53:17 -04001248 dfprintk(LOOKUPCACHE, "%s: %pd2 has negative inode\n",
1249 __func__, dentry);
Jeff Laytonecf3d1f2013-02-20 11:19:05 -05001250 return 1;
1251 }
1252
1253 if (is_bad_inode(inode)) {
Al Viro6de14722013-09-16 10:53:17 -04001254 dfprintk(LOOKUPCACHE, "%s: %pd2 has dud inode\n",
1255 __func__, dentry);
Jeff Laytonecf3d1f2013-02-20 11:19:05 -05001256 return 0;
1257 }
1258
1259 error = nfs_revalidate_inode(NFS_SERVER(inode), inode);
1260 dfprintk(LOOKUPCACHE, "NFS: %s: inode %lu is %s\n",
1261 __func__, inode->i_ino, error ? "invalid" : "valid");
1262 return !error;
1263}
1264
1265/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001266 * This is called from dput() when d_count is going to 0.
1267 */
Nick Pigginfe15ce42011-01-07 17:49:23 +11001268static int nfs_dentry_delete(const struct dentry *dentry)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001269{
Al Viro6de14722013-09-16 10:53:17 -04001270 dfprintk(VFS, "NFS: dentry_delete(%pd2, %x)\n",
1271 dentry, dentry->d_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001272
Trond Myklebust77f11192008-01-28 19:43:19 -05001273 /* Unhash any dentry with a stale inode */
1274 if (dentry->d_inode != NULL && NFS_STALE(dentry->d_inode))
1275 return 1;
1276
Linus Torvalds1da177e2005-04-16 15:20:36 -07001277 if (dentry->d_flags & DCACHE_NFSFS_RENAMED) {
1278 /* Unhash it, so that ->d_iput() would be called */
1279 return 1;
1280 }
1281 if (!(dentry->d_sb->s_flags & MS_ACTIVE)) {
1282 /* Unhash it, so that ancestors of killed async unlink
1283 * files will be cleaned up during umount */
1284 return 1;
1285 }
1286 return 0;
1287
1288}
1289
Trond Myklebust1f018452012-12-14 16:38:46 -05001290/* Ensure that we revalidate inode->i_nlink */
Trond Myklebust1b83d702008-06-11 15:44:04 -04001291static void nfs_drop_nlink(struct inode *inode)
1292{
1293 spin_lock(&inode->i_lock);
Trond Myklebust1f018452012-12-14 16:38:46 -05001294 /* drop the inode if we're reasonably sure this is the last link */
1295 if (inode->i_nlink == 1)
1296 clear_nlink(inode);
1297 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
Trond Myklebust1b83d702008-06-11 15:44:04 -04001298 spin_unlock(&inode->i_lock);
1299}
1300
Linus Torvalds1da177e2005-04-16 15:20:36 -07001301/*
1302 * Called when the dentry loses inode.
1303 * We use it to clean up silly-renamed files.
1304 */
1305static void nfs_dentry_iput(struct dentry *dentry, struct inode *inode)
1306{
Neil Brown83672d32007-02-26 12:48:25 +11001307 if (S_ISDIR(inode->i_mode))
1308 /* drop any readdir cache as it could easily be old */
1309 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_DATA;
1310
Linus Torvalds1da177e2005-04-16 15:20:36 -07001311 if (dentry->d_flags & DCACHE_NFSFS_RENAMED) {
Trond Myklebuste4eff1a2007-07-14 15:39:58 -04001312 nfs_complete_unlink(dentry, inode);
Trond Myklebust1f018452012-12-14 16:38:46 -05001313 nfs_drop_nlink(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001314 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001315 iput(inode);
1316}
1317
Al Virob1942c52011-03-16 05:44:14 -04001318static void nfs_d_release(struct dentry *dentry)
1319{
1320 /* free cached devname value, if it survived that far */
1321 if (unlikely(dentry->d_fsdata)) {
1322 if (dentry->d_flags & DCACHE_NFSFS_RENAMED)
1323 WARN_ON(1);
1324 else
1325 kfree(dentry->d_fsdata);
1326 }
1327}
1328
Al Virof786aa92009-02-20 05:51:22 +00001329const struct dentry_operations nfs_dentry_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001330 .d_revalidate = nfs_lookup_revalidate,
Jeff Laytonecf3d1f2013-02-20 11:19:05 -05001331 .d_weak_revalidate = nfs_weak_revalidate,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001332 .d_delete = nfs_dentry_delete,
1333 .d_iput = nfs_dentry_iput,
David Howells36d43a42011-01-14 18:45:42 +00001334 .d_automount = nfs_d_automount,
Al Virob1942c52011-03-16 05:44:14 -04001335 .d_release = nfs_d_release,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001336};
Bryan Schumakerddda8e02012-07-30 16:05:23 -04001337EXPORT_SYMBOL_GPL(nfs_dentry_operations);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001338
Bryan Schumaker597d9282012-07-16 16:39:10 -04001339struct dentry *nfs_lookup(struct inode *dir, struct dentry * dentry, unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001340{
1341 struct dentry *res;
Trond Myklebust565277f2007-10-15 18:17:53 -04001342 struct dentry *parent;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001343 struct inode *inode = NULL;
Trond Myklebuste1fb4d02010-04-16 16:22:47 -04001344 struct nfs_fh *fhandle = NULL;
1345 struct nfs_fattr *fattr = NULL;
David Quigley1775fd32013-05-22 12:50:42 -04001346 struct nfs4_label *label = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001347 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001348
Al Viro6de14722013-09-16 10:53:17 -04001349 dfprintk(VFS, "NFS: lookup(%pd2)\n", dentry);
Chuck Lever91d5b472006-03-20 13:44:14 -05001350 nfs_inc_stats(dir, NFSIOS_VFSLOOKUP);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001351
1352 res = ERR_PTR(-ENAMETOOLONG);
1353 if (dentry->d_name.len > NFS_SERVER(dir)->namelen)
1354 goto out;
1355
Trond Myklebustfd684072006-09-05 12:27:44 -04001356 /*
1357 * If we're doing an exclusive create, optimize away the lookup
1358 * but don't hash the dentry.
1359 */
Al Viro00cd8dd2012-06-10 17:13:09 -04001360 if (nfs_is_exclusive_create(dir, flags)) {
Trond Myklebustfd684072006-09-05 12:27:44 -04001361 d_instantiate(dentry, NULL);
1362 res = NULL;
Trond Myklebustfc0f6842008-06-11 15:44:20 -04001363 goto out;
Trond Myklebustfd684072006-09-05 12:27:44 -04001364 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001365
Trond Myklebuste1fb4d02010-04-16 16:22:47 -04001366 res = ERR_PTR(-ENOMEM);
1367 fhandle = nfs_alloc_fhandle();
1368 fattr = nfs_alloc_fattr();
1369 if (fhandle == NULL || fattr == NULL)
1370 goto out;
1371
David Quigley14c43f72013-05-22 12:50:43 -04001372 label = nfs4_label_alloc(NFS_SERVER(dir), GFP_NOWAIT);
1373 if (IS_ERR(label))
1374 goto out;
1375
Trond Myklebust565277f2007-10-15 18:17:53 -04001376 parent = dentry->d_parent;
1377 /* Protect against concurrent sillydeletes */
Trond Myklebust6e0d0be2013-08-20 11:26:17 -04001378 trace_nfs_lookup_enter(dir, dentry, flags);
Trond Myklebust565277f2007-10-15 18:17:53 -04001379 nfs_block_sillyrename(parent);
David Quigley1775fd32013-05-22 12:50:42 -04001380 error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, fhandle, fattr, label);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001381 if (error == -ENOENT)
1382 goto no_entry;
1383 if (error < 0) {
1384 res = ERR_PTR(error);
Trond Myklebust565277f2007-10-15 18:17:53 -04001385 goto out_unblock_sillyrename;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001386 }
David Quigley1775fd32013-05-22 12:50:42 -04001387 inode = nfs_fhget(dentry->d_sb, fhandle, fattr, label);
Namhyung Kimbf0c84f2010-12-28 17:02:46 +00001388 res = ERR_CAST(inode);
Trond Myklebust03f28e32006-03-20 13:44:48 -05001389 if (IS_ERR(res))
Trond Myklebust565277f2007-10-15 18:17:53 -04001390 goto out_unblock_sillyrename;
David Howells54ceac42006-08-22 20:06:13 -04001391
Trond Myklebustd69ee9b2012-05-01 17:37:59 -04001392 /* Success: notify readdir to use READDIRPLUS */
1393 nfs_advise_use_readdirplus(dir);
1394
Linus Torvalds1da177e2005-04-16 15:20:36 -07001395no_entry:
Al Viro41d28bc2014-10-12 22:24:21 -04001396 res = d_splice_alias(inode, dentry);
Trond Myklebust9eaef272006-10-21 10:24:20 -07001397 if (res != NULL) {
1398 if (IS_ERR(res))
Trond Myklebust565277f2007-10-15 18:17:53 -04001399 goto out_unblock_sillyrename;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001400 dentry = res;
Trond Myklebust9eaef272006-10-21 10:24:20 -07001401 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001402 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
Trond Myklebust565277f2007-10-15 18:17:53 -04001403out_unblock_sillyrename:
1404 nfs_unblock_sillyrename(parent);
Trond Myklebust6e0d0be2013-08-20 11:26:17 -04001405 trace_nfs_lookup_exit(dir, dentry, flags, error);
David Quigley14c43f72013-05-22 12:50:43 -04001406 nfs4_label_free(label);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001407out:
Trond Myklebuste1fb4d02010-04-16 16:22:47 -04001408 nfs_free_fattr(fattr);
1409 nfs_free_fhandle(fhandle);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001410 return res;
1411}
Bryan Schumakerddda8e02012-07-30 16:05:23 -04001412EXPORT_SYMBOL_GPL(nfs_lookup);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001413
Bryan Schumaker89d77c82012-07-30 16:05:25 -04001414#if IS_ENABLED(CONFIG_NFS_V4)
Al Viro0b728e12012-06-10 16:03:43 -04001415static int nfs4_lookup_revalidate(struct dentry *, unsigned int);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001416
Al Virof786aa92009-02-20 05:51:22 +00001417const struct dentry_operations nfs4_dentry_operations = {
Miklos Szeredi0ef97dc2012-05-21 17:30:20 +02001418 .d_revalidate = nfs4_lookup_revalidate,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001419 .d_delete = nfs_dentry_delete,
1420 .d_iput = nfs_dentry_iput,
David Howells36d43a42011-01-14 18:45:42 +00001421 .d_automount = nfs_d_automount,
Al Virob1942c52011-03-16 05:44:14 -04001422 .d_release = nfs_d_release,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001423};
Bryan Schumaker89d77c82012-07-30 16:05:25 -04001424EXPORT_SYMBOL_GPL(nfs4_dentry_operations);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001425
Al Viro8a5e9292011-06-25 19:15:54 -04001426static fmode_t flags_to_mode(int flags)
1427{
1428 fmode_t res = (__force fmode_t)flags & FMODE_EXEC;
1429 if ((flags & O_ACCMODE) != O_WRONLY)
1430 res |= FMODE_READ;
1431 if ((flags & O_ACCMODE) != O_RDONLY)
1432 res |= FMODE_WRITE;
1433 return res;
1434}
1435
Al Viro51141592011-06-22 18:47:28 -04001436static struct nfs_open_context *create_nfs_open_context(struct dentry *dentry, int open_flags)
Trond Myklebustcd9a1c02010-09-17 10:56:50 -04001437{
Al Viro5ede7b12011-10-23 18:49:54 -04001438 return alloc_nfs_open_context(dentry, flags_to_mode(open_flags));
Trond Myklebustcd9a1c02010-09-17 10:56:50 -04001439}
1440
1441static int do_open(struct inode *inode, struct file *filp)
1442{
David Howellsf1fe29b2013-09-27 11:20:03 +01001443 nfs_fscache_open_file(inode, filp);
Trond Myklebustcd9a1c02010-09-17 10:56:50 -04001444 return 0;
1445}
1446
Al Virod9585272012-06-22 12:39:14 +04001447static int nfs_finish_open(struct nfs_open_context *ctx,
1448 struct dentry *dentry,
Al Viro30d90492012-06-22 12:40:19 +04001449 struct file *file, unsigned open_flags,
Al Virod9585272012-06-22 12:39:14 +04001450 int *opened)
Trond Myklebustcd9a1c02010-09-17 10:56:50 -04001451{
Miklos Szeredi0dd2b472012-06-05 15:10:18 +02001452 int err;
1453
Miklos Szeredi01c919a2013-09-16 14:52:04 +02001454 if ((open_flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
1455 *opened |= FILE_CREATED;
1456
Al Viro30d90492012-06-22 12:40:19 +04001457 err = finish_open(file, dentry, do_open, opened);
1458 if (err)
Al Virod9585272012-06-22 12:39:14 +04001459 goto out;
Al Viro30d90492012-06-22 12:40:19 +04001460 nfs_file_set_open_context(file, ctx);
Miklos Szeredi0dd2b472012-06-05 15:10:18 +02001461
Trond Myklebustcd9a1c02010-09-17 10:56:50 -04001462out:
Al Virod9585272012-06-22 12:39:14 +04001463 return err;
Trond Myklebustcd9a1c02010-09-17 10:56:50 -04001464}
1465
Bryan Schumaker73a79702012-07-16 16:39:12 -04001466int nfs_atomic_open(struct inode *dir, struct dentry *dentry,
1467 struct file *file, unsigned open_flags,
1468 umode_t mode, int *opened)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001469{
Trond Myklebustcd9a1c02010-09-17 10:56:50 -04001470 struct nfs_open_context *ctx;
Miklos Szeredi0dd2b472012-06-05 15:10:18 +02001471 struct dentry *res;
1472 struct iattr attr = { .ia_valid = ATTR_OPEN };
Trond Myklebustf46e0bd2010-09-17 10:56:50 -04001473 struct inode *inode;
Trond Myklebust1472b832013-08-20 11:59:41 -04001474 unsigned int lookup_flags = 0;
Trond Myklebust898f6352010-10-23 11:24:25 -04001475 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001476
Miklos Szeredi0dd2b472012-06-05 15:10:18 +02001477 /* Expect a negative dentry */
1478 BUG_ON(dentry->d_inode);
1479
Niels de Vos1e8968c2013-12-17 18:20:16 +01001480 dfprintk(VFS, "NFS: atomic_open(%s/%lu), %pd\n",
Al Viro6de14722013-09-16 10:53:17 -04001481 dir->i_sb->s_id, dir->i_ino, dentry);
Chuck Lever1e7cb3d2006-03-20 13:44:24 -05001482
Jeff Layton9597c132013-08-02 11:39:32 -04001483 err = nfs_check_flags(open_flags);
1484 if (err)
1485 return err;
1486
Miklos Szeredi0dd2b472012-06-05 15:10:18 +02001487 /* NFS only supports OPEN on regular files */
1488 if ((open_flags & O_DIRECTORY)) {
Miklos Szeredi0dd2b472012-06-05 15:10:18 +02001489 if (!d_unhashed(dentry)) {
1490 /*
1491 * Hashed negative dentry with O_DIRECTORY: dentry was
1492 * revalidated and is fine, no need to perform lookup
1493 * again
1494 */
Al Virod9585272012-06-22 12:39:14 +04001495 return -ENOENT;
Miklos Szeredi0dd2b472012-06-05 15:10:18 +02001496 }
Trond Myklebust1472b832013-08-20 11:59:41 -04001497 lookup_flags = LOOKUP_OPEN|LOOKUP_DIRECTORY;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001498 goto no_open;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001499 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001500
Miklos Szeredi0dd2b472012-06-05 15:10:18 +02001501 if (dentry->d_name.len > NFS_SERVER(dir)->namelen)
Al Virod9585272012-06-22 12:39:14 +04001502 return -ENAMETOOLONG;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001503
Miklos Szeredi0dd2b472012-06-05 15:10:18 +02001504 if (open_flags & O_CREAT) {
Trond Myklebust536e43d2012-01-17 22:04:26 -05001505 attr.ia_valid |= ATTR_MODE;
Miklos Szeredi0dd2b472012-06-05 15:10:18 +02001506 attr.ia_mode = mode & ~current_umask();
1507 }
Trond Myklebust536e43d2012-01-17 22:04:26 -05001508 if (open_flags & O_TRUNC) {
1509 attr.ia_valid |= ATTR_SIZE;
1510 attr.ia_size = 0;
Trond Myklebustcd9a1c02010-09-17 10:56:50 -04001511 }
1512
Miklos Szeredi0dd2b472012-06-05 15:10:18 +02001513 ctx = create_nfs_open_context(dentry, open_flags);
1514 err = PTR_ERR(ctx);
1515 if (IS_ERR(ctx))
Al Virod9585272012-06-22 12:39:14 +04001516 goto out;
Miklos Szeredi0dd2b472012-06-05 15:10:18 +02001517
Trond Myklebust6e0d0be2013-08-20 11:26:17 -04001518 trace_nfs_atomic_open_enter(dir, ctx, open_flags);
Trond Myklebustf46e0bd2010-09-17 10:56:50 -04001519 nfs_block_sillyrename(dentry->d_parent);
Trond Myklebust5bc2afc2013-09-23 18:01:28 -04001520 inode = NFS_PROTO(dir)->open_context(dir, ctx, open_flags, &attr, opened);
Trond Myklebust275bb302013-05-29 13:11:28 -04001521 nfs_unblock_sillyrename(dentry->d_parent);
Trond Myklebustf46e0bd2010-09-17 10:56:50 -04001522 if (IS_ERR(inode)) {
Miklos Szeredi0dd2b472012-06-05 15:10:18 +02001523 err = PTR_ERR(inode);
Trond Myklebust6e0d0be2013-08-20 11:26:17 -04001524 trace_nfs_atomic_open_exit(dir, ctx, open_flags, err);
Trond Myklebust2d9db752013-08-30 09:17:33 -04001525 put_nfs_open_context(ctx);
Miklos Szeredi0dd2b472012-06-05 15:10:18 +02001526 switch (err) {
1527 case -ENOENT:
Trond Myklebust275bb302013-05-29 13:11:28 -04001528 d_drop(dentry);
Miklos Szeredi0dd2b472012-06-05 15:10:18 +02001529 d_add(dentry, NULL);
Trond Myklebust809fd142014-10-23 19:33:14 +03001530 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
Miklos Szeredi0dd2b472012-06-05 15:10:18 +02001531 break;
1532 case -EISDIR:
1533 case -ENOTDIR:
1534 goto no_open;
1535 case -ELOOP:
1536 if (!(open_flags & O_NOFOLLOW))
Trond Myklebust6f926b52005-10-18 14:20:18 -07001537 goto no_open;
Miklos Szeredi0dd2b472012-06-05 15:10:18 +02001538 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001539 /* case -EINVAL: */
Miklos Szeredi0dd2b472012-06-05 15:10:18 +02001540 default:
1541 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001542 }
Al Virod9585272012-06-22 12:39:14 +04001543 goto out;
Trond Myklebustcd9a1c02010-09-17 10:56:50 -04001544 }
Miklos Szeredi0dd2b472012-06-05 15:10:18 +02001545
Trond Myklebust275bb302013-05-29 13:11:28 -04001546 err = nfs_finish_open(ctx, ctx->dentry, file, open_flags, opened);
Trond Myklebust6e0d0be2013-08-20 11:26:17 -04001547 trace_nfs_atomic_open_exit(dir, ctx, open_flags, err);
Trond Myklebust2d9db752013-08-30 09:17:33 -04001548 put_nfs_open_context(ctx);
Al Virod9585272012-06-22 12:39:14 +04001549out:
1550 return err;
Miklos Szeredi0dd2b472012-06-05 15:10:18 +02001551
Linus Torvalds1da177e2005-04-16 15:20:36 -07001552no_open:
Trond Myklebust1472b832013-08-20 11:59:41 -04001553 res = nfs_lookup(dir, dentry, lookup_flags);
Miklos Szeredi0dd2b472012-06-05 15:10:18 +02001554 err = PTR_ERR(res);
1555 if (IS_ERR(res))
Al Virod9585272012-06-22 12:39:14 +04001556 goto out;
Miklos Szeredi0dd2b472012-06-05 15:10:18 +02001557
Al Viroe45198a2012-06-10 06:48:09 -04001558 return finish_no_open(file, res);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001559}
Bryan Schumaker89d77c82012-07-30 16:05:25 -04001560EXPORT_SYMBOL_GPL(nfs_atomic_open);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001561
Al Viro0b728e12012-06-10 16:03:43 -04001562static int nfs4_lookup_revalidate(struct dentry *dentry, unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001563{
Nick Piggin657e94b2011-01-14 02:48:39 +00001564 struct inode *inode;
Miklos Szeredi50de3482012-06-05 15:10:20 +02001565 int ret = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001566
Al Virofa3c56b2012-06-10 15:36:40 -04001567 if (!(flags & LOOKUP_OPEN) || (flags & LOOKUP_DIRECTORY))
Miklos Szeredieda72af2012-06-05 15:10:21 +02001568 goto no_open;
1569 if (d_mountpoint(dentry))
Trond Myklebust5584c302008-12-23 15:21:54 -05001570 goto no_open;
Trond Myklebust49f9a0f2013-03-15 16:44:28 -04001571 if (NFS_SB(dentry->d_sb)->caps & NFS_CAP_ATOMIC_OPEN_V1)
1572 goto no_open;
Trond Myklebust2b484292010-09-17 10:56:51 -04001573
Miklos Szeredieda72af2012-06-05 15:10:21 +02001574 inode = dentry->d_inode;
Trond Myklebust2b484292010-09-17 10:56:51 -04001575
Linus Torvalds1da177e2005-04-16 15:20:36 -07001576 /* We can't create new files in nfs_open_revalidate(), so we
1577 * optimize away revalidation of negative dentries.
1578 */
Trond Myklebust216d5d02007-10-01 20:10:12 -04001579 if (inode == NULL) {
NeilBrown49317a72014-07-14 11:28:20 +10001580 struct dentry *parent;
1581 struct inode *dir;
1582
NeilBrown912a1082014-07-14 11:28:20 +10001583 if (flags & LOOKUP_RCU) {
NeilBrown50d77732014-08-04 16:24:00 +10001584 parent = ACCESS_ONCE(dentry->d_parent);
NeilBrown912a1082014-07-14 11:28:20 +10001585 dir = ACCESS_ONCE(parent->d_inode);
1586 if (!dir)
1587 return -ECHILD;
1588 } else {
1589 parent = dget_parent(dentry);
1590 dir = parent->d_inode;
1591 }
Al Virofa3c56b2012-06-10 15:36:40 -04001592 if (!nfs_neg_need_reval(dir, dentry, flags))
Trond Myklebust216d5d02007-10-01 20:10:12 -04001593 ret = 1;
NeilBrown912a1082014-07-14 11:28:20 +10001594 else if (flags & LOOKUP_RCU)
1595 ret = -ECHILD;
1596 if (!(flags & LOOKUP_RCU))
1597 dput(parent);
NeilBrown50d77732014-08-04 16:24:00 +10001598 else if (parent != ACCESS_ONCE(dentry->d_parent))
NeilBrown912a1082014-07-14 11:28:20 +10001599 return -ECHILD;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001600 goto out;
Trond Myklebust216d5d02007-10-01 20:10:12 -04001601 }
1602
Linus Torvalds1da177e2005-04-16 15:20:36 -07001603 /* NFS only supports OPEN on regular files */
1604 if (!S_ISREG(inode->i_mode))
NeilBrown49317a72014-07-14 11:28:20 +10001605 goto no_open;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001606 /* We cannot do exclusive creation on a positive dentry */
Al Virofa3c56b2012-06-10 15:36:40 -04001607 if (flags & LOOKUP_EXCL)
NeilBrown49317a72014-07-14 11:28:20 +10001608 goto no_open;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001609
Miklos Szeredi0ef97dc2012-05-21 17:30:20 +02001610 /* Let f_op->open() actually open (and revalidate) the file */
1611 ret = 1;
Trond Myklebust536e43d2012-01-17 22:04:26 -05001612
Linus Torvalds1da177e2005-04-16 15:20:36 -07001613out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001614 return ret;
Trond Myklebust535918f2010-09-17 10:56:51 -04001615
Trond Myklebust5584c302008-12-23 15:21:54 -05001616no_open:
Al Viro0b728e12012-06-10 16:03:43 -04001617 return nfs_lookup_revalidate(dentry, flags);
Trond Myklebustc0204fd2010-09-17 10:56:51 -04001618}
1619
Linus Torvalds1da177e2005-04-16 15:20:36 -07001620#endif /* CONFIG_NFSV4 */
1621
Linus Torvalds1da177e2005-04-16 15:20:36 -07001622/*
1623 * Code common to create, mkdir, and mknod.
1624 */
1625int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fhandle,
David Quigley1775fd32013-05-22 12:50:42 -04001626 struct nfs_fattr *fattr,
1627 struct nfs4_label *label)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001628{
Trond Myklebustfab728e2007-09-29 17:41:33 -04001629 struct dentry *parent = dget_parent(dentry);
1630 struct inode *dir = parent->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001631 struct inode *inode;
1632 int error = -EACCES;
1633
Trond Myklebustfab728e2007-09-29 17:41:33 -04001634 d_drop(dentry);
1635
Linus Torvalds1da177e2005-04-16 15:20:36 -07001636 /* We may have been initialized further down */
1637 if (dentry->d_inode)
Trond Myklebustfab728e2007-09-29 17:41:33 -04001638 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001639 if (fhandle->size == 0) {
David Quigley1775fd32013-05-22 12:50:42 -04001640 error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, fhandle, fattr, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001641 if (error)
Trond Myklebustfab728e2007-09-29 17:41:33 -04001642 goto out_error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001643 }
Trond Myklebust5724ab32007-10-01 21:51:38 -04001644 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001645 if (!(fattr->valid & NFS_ATTR_FATTR)) {
1646 struct nfs_server *server = NFS_SB(dentry->d_sb);
David Quigley1775fd32013-05-22 12:50:42 -04001647 error = server->nfs_client->rpc_ops->getattr(server, fhandle, fattr, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001648 if (error < 0)
Trond Myklebustfab728e2007-09-29 17:41:33 -04001649 goto out_error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001650 }
David Quigley1775fd32013-05-22 12:50:42 -04001651 inode = nfs_fhget(dentry->d_sb, fhandle, fattr, label);
Trond Myklebust03f28e32006-03-20 13:44:48 -05001652 error = PTR_ERR(inode);
1653 if (IS_ERR(inode))
Trond Myklebustfab728e2007-09-29 17:41:33 -04001654 goto out_error;
1655 d_add(dentry, inode);
1656out:
1657 dput(parent);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001658 return 0;
Trond Myklebustfab728e2007-09-29 17:41:33 -04001659out_error:
1660 nfs_mark_for_revalidate(dir);
1661 dput(parent);
1662 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001663}
Bryan Schumakerddda8e02012-07-30 16:05:23 -04001664EXPORT_SYMBOL_GPL(nfs_instantiate);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001665
1666/*
1667 * Following a failed create operation, we drop the dentry rather
1668 * than retain a negative dentry. This avoids a problem in the event
1669 * that the operation succeeded on the server, but an error in the
1670 * reply path made it appear to have failed.
1671 */
Bryan Schumaker597d9282012-07-16 16:39:10 -04001672int nfs_create(struct inode *dir, struct dentry *dentry,
Al Viroebfc3b42012-06-10 18:05:36 -04001673 umode_t mode, bool excl)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001674{
1675 struct iattr attr;
Al Viroebfc3b42012-06-10 18:05:36 -04001676 int open_flags = excl ? O_CREAT | O_EXCL : O_CREAT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001677 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001678
Niels de Vos1e8968c2013-12-17 18:20:16 +01001679 dfprintk(VFS, "NFS: create(%s/%lu), %pd\n",
Al Viro6de14722013-09-16 10:53:17 -04001680 dir->i_sb->s_id, dir->i_ino, dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001681
1682 attr.ia_mode = mode;
1683 attr.ia_valid = ATTR_MODE;
1684
Trond Myklebust8b0ad3d2013-08-21 10:53:09 -04001685 trace_nfs_create_enter(dir, dentry, open_flags);
Miklos Szeredi8867fe52012-06-05 15:10:19 +02001686 error = NFS_PROTO(dir)->create(dir, dentry, &attr, open_flags);
Trond Myklebust8b0ad3d2013-08-21 10:53:09 -04001687 trace_nfs_create_exit(dir, dentry, open_flags, error);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001688 if (error != 0)
1689 goto out_err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001690 return 0;
1691out_err:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001692 d_drop(dentry);
1693 return error;
1694}
Bryan Schumakerddda8e02012-07-30 16:05:23 -04001695EXPORT_SYMBOL_GPL(nfs_create);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001696
1697/*
1698 * See comments for nfs_proc_create regarding failed operations.
1699 */
Bryan Schumaker597d9282012-07-16 16:39:10 -04001700int
Al Viro1a67aaf2011-07-26 01:52:52 -04001701nfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t rdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001702{
1703 struct iattr attr;
1704 int status;
1705
Niels de Vos1e8968c2013-12-17 18:20:16 +01001706 dfprintk(VFS, "NFS: mknod(%s/%lu), %pd\n",
Al Viro6de14722013-09-16 10:53:17 -04001707 dir->i_sb->s_id, dir->i_ino, dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001708
1709 if (!new_valid_dev(rdev))
1710 return -EINVAL;
1711
1712 attr.ia_mode = mode;
1713 attr.ia_valid = ATTR_MODE;
1714
Trond Myklebust1ca42382013-08-21 12:36:04 -04001715 trace_nfs_mknod_enter(dir, dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001716 status = NFS_PROTO(dir)->mknod(dir, dentry, &attr, rdev);
Trond Myklebust1ca42382013-08-21 12:36:04 -04001717 trace_nfs_mknod_exit(dir, dentry, status);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001718 if (status != 0)
1719 goto out_err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001720 return 0;
1721out_err:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001722 d_drop(dentry);
1723 return status;
1724}
Bryan Schumakerddda8e02012-07-30 16:05:23 -04001725EXPORT_SYMBOL_GPL(nfs_mknod);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001726
1727/*
1728 * See comments for nfs_proc_create regarding failed operations.
1729 */
Bryan Schumaker597d9282012-07-16 16:39:10 -04001730int nfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001731{
1732 struct iattr attr;
1733 int error;
1734
Niels de Vos1e8968c2013-12-17 18:20:16 +01001735 dfprintk(VFS, "NFS: mkdir(%s/%lu), %pd\n",
Al Viro6de14722013-09-16 10:53:17 -04001736 dir->i_sb->s_id, dir->i_ino, dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001737
1738 attr.ia_valid = ATTR_MODE;
1739 attr.ia_mode = mode | S_IFDIR;
1740
Trond Myklebust1ca42382013-08-21 12:36:04 -04001741 trace_nfs_mkdir_enter(dir, dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001742 error = NFS_PROTO(dir)->mkdir(dir, dentry, &attr);
Trond Myklebust1ca42382013-08-21 12:36:04 -04001743 trace_nfs_mkdir_exit(dir, dentry, error);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001744 if (error != 0)
1745 goto out_err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001746 return 0;
1747out_err:
1748 d_drop(dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001749 return error;
1750}
Bryan Schumakerddda8e02012-07-30 16:05:23 -04001751EXPORT_SYMBOL_GPL(nfs_mkdir);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001752
Trond Myklebustd45b9d82008-01-28 19:43:18 -05001753static void nfs_dentry_handle_enoent(struct dentry *dentry)
1754{
1755 if (dentry->d_inode != NULL && !d_unhashed(dentry))
1756 d_delete(dentry);
1757}
1758
Bryan Schumaker597d9282012-07-16 16:39:10 -04001759int nfs_rmdir(struct inode *dir, struct dentry *dentry)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001760{
1761 int error;
1762
Niels de Vos1e8968c2013-12-17 18:20:16 +01001763 dfprintk(VFS, "NFS: rmdir(%s/%lu), %pd\n",
Al Viro6de14722013-09-16 10:53:17 -04001764 dir->i_sb->s_id, dir->i_ino, dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001765
Trond Myklebust1ca42382013-08-21 12:36:04 -04001766 trace_nfs_rmdir_enter(dir, dentry);
Trond Myklebustba6c0592013-08-30 12:24:25 -04001767 if (dentry->d_inode) {
1768 nfs_wait_on_sillyrename(dentry);
1769 error = NFS_PROTO(dir)->rmdir(dir, &dentry->d_name);
1770 /* Ensure the VFS deletes this inode */
1771 switch (error) {
1772 case 0:
1773 clear_nlink(dentry->d_inode);
1774 break;
1775 case -ENOENT:
1776 nfs_dentry_handle_enoent(dentry);
1777 }
1778 } else
1779 error = NFS_PROTO(dir)->rmdir(dir, &dentry->d_name);
Trond Myklebust1ca42382013-08-21 12:36:04 -04001780 trace_nfs_rmdir_exit(dir, dentry, error);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001781
1782 return error;
1783}
Bryan Schumakerddda8e02012-07-30 16:05:23 -04001784EXPORT_SYMBOL_GPL(nfs_rmdir);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001785
Linus Torvalds1da177e2005-04-16 15:20:36 -07001786/*
1787 * Remove a file after making sure there are no pending writes,
1788 * and after checking that the file has only one user.
1789 *
1790 * We invalidate the attribute cache and free the inode prior to the operation
1791 * to avoid possible races if the server reuses the inode.
1792 */
1793static int nfs_safe_remove(struct dentry *dentry)
1794{
1795 struct inode *dir = dentry->d_parent->d_inode;
1796 struct inode *inode = dentry->d_inode;
1797 int error = -EBUSY;
1798
Al Viro6de14722013-09-16 10:53:17 -04001799 dfprintk(VFS, "NFS: safe_remove(%pd2)\n", dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001800
1801 /* If the dentry was sillyrenamed, we simply call d_delete() */
1802 if (dentry->d_flags & DCACHE_NFSFS_RENAMED) {
1803 error = 0;
1804 goto out;
1805 }
1806
Trond Myklebust1ca42382013-08-21 12:36:04 -04001807 trace_nfs_remove_enter(dir, dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001808 if (inode != NULL) {
Bryan Schumaker57ec14c2012-06-20 15:53:44 -04001809 NFS_PROTO(inode)->return_delegation(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001810 error = NFS_PROTO(dir)->remove(dir, &dentry->d_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001811 if (error == 0)
Trond Myklebust1b83d702008-06-11 15:44:04 -04001812 nfs_drop_nlink(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001813 } else
1814 error = NFS_PROTO(dir)->remove(dir, &dentry->d_name);
Trond Myklebustd45b9d82008-01-28 19:43:18 -05001815 if (error == -ENOENT)
1816 nfs_dentry_handle_enoent(dentry);
Trond Myklebust1ca42382013-08-21 12:36:04 -04001817 trace_nfs_remove_exit(dir, dentry, error);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001818out:
1819 return error;
1820}
1821
1822/* We do silly rename. In case sillyrename() returns -EBUSY, the inode
1823 * belongs to an active ".nfs..." file and we return -EBUSY.
1824 *
1825 * If sillyrename() returns 0, we do nothing, otherwise we unlink.
1826 */
Bryan Schumaker597d9282012-07-16 16:39:10 -04001827int nfs_unlink(struct inode *dir, struct dentry *dentry)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001828{
1829 int error;
1830 int need_rehash = 0;
1831
Niels de Vos1e8968c2013-12-17 18:20:16 +01001832 dfprintk(VFS, "NFS: unlink(%s/%lu, %pd)\n", dir->i_sb->s_id,
Al Viro6de14722013-09-16 10:53:17 -04001833 dir->i_ino, dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001834
Trond Myklebust1ca42382013-08-21 12:36:04 -04001835 trace_nfs_unlink_enter(dir, dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001836 spin_lock(&dentry->d_lock);
Al Viro84d08fa2013-07-05 18:59:33 +04001837 if (d_count(dentry) > 1) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001838 spin_unlock(&dentry->d_lock);
Trond Myklebustccfeb502007-01-13 02:28:12 -05001839 /* Start asynchronous writeout of the inode */
1840 write_inode_now(dentry->d_inode, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001841 error = nfs_sillyrename(dir, dentry);
Trond Myklebust1ca42382013-08-21 12:36:04 -04001842 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001843 }
1844 if (!d_unhashed(dentry)) {
1845 __d_drop(dentry);
1846 need_rehash = 1;
1847 }
1848 spin_unlock(&dentry->d_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001849 error = nfs_safe_remove(dentry);
Trond Myklebustd45b9d82008-01-28 19:43:18 -05001850 if (!error || error == -ENOENT) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001851 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1852 } else if (need_rehash)
1853 d_rehash(dentry);
Trond Myklebust1ca42382013-08-21 12:36:04 -04001854out:
1855 trace_nfs_unlink_exit(dir, dentry, error);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001856 return error;
1857}
Bryan Schumakerddda8e02012-07-30 16:05:23 -04001858EXPORT_SYMBOL_GPL(nfs_unlink);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001859
Chuck Lever873101b2006-08-22 20:06:23 -04001860/*
1861 * To create a symbolic link, most file systems instantiate a new inode,
1862 * add a page to it containing the path, then write it out to the disk
1863 * using prepare_write/commit_write.
1864 *
1865 * Unfortunately the NFS client can't create the in-core inode first
1866 * because it needs a file handle to create an in-core inode (see
1867 * fs/nfs/inode.c:nfs_fhget). We only have a file handle *after* the
1868 * symlink request has completed on the server.
1869 *
1870 * So instead we allocate a raw page, copy the symname into it, then do
1871 * the SYMLINK request with the page as the buffer. If it succeeds, we
1872 * now have a new file handle and can instantiate an in-core NFS inode
1873 * and move the raw page into its mapping.
1874 */
Bryan Schumaker597d9282012-07-16 16:39:10 -04001875int nfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001876{
Chuck Lever873101b2006-08-22 20:06:23 -04001877 struct page *page;
1878 char *kaddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001879 struct iattr attr;
Chuck Lever873101b2006-08-22 20:06:23 -04001880 unsigned int pathlen = strlen(symname);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001881 int error;
1882
Niels de Vos1e8968c2013-12-17 18:20:16 +01001883 dfprintk(VFS, "NFS: symlink(%s/%lu, %pd, %s)\n", dir->i_sb->s_id,
Al Viro6de14722013-09-16 10:53:17 -04001884 dir->i_ino, dentry, symname);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001885
Chuck Lever873101b2006-08-22 20:06:23 -04001886 if (pathlen > PAGE_SIZE)
1887 return -ENAMETOOLONG;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001888
Chuck Lever873101b2006-08-22 20:06:23 -04001889 attr.ia_mode = S_IFLNK | S_IRWXUGO;
1890 attr.ia_valid = ATTR_MODE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001891
Jeff Layton83d93f22007-06-07 09:58:08 -04001892 page = alloc_page(GFP_HIGHUSER);
Trond Myklebust76566992008-06-11 15:44:22 -04001893 if (!page)
Chuck Lever873101b2006-08-22 20:06:23 -04001894 return -ENOMEM;
Chuck Lever873101b2006-08-22 20:06:23 -04001895
Cong Wang2b86ce22011-11-25 23:14:33 +08001896 kaddr = kmap_atomic(page);
Chuck Lever873101b2006-08-22 20:06:23 -04001897 memcpy(kaddr, symname, pathlen);
1898 if (pathlen < PAGE_SIZE)
1899 memset(kaddr + pathlen, 0, PAGE_SIZE - pathlen);
Cong Wang2b86ce22011-11-25 23:14:33 +08001900 kunmap_atomic(kaddr);
Chuck Lever873101b2006-08-22 20:06:23 -04001901
Trond Myklebust1ca42382013-08-21 12:36:04 -04001902 trace_nfs_symlink_enter(dir, dentry);
Chuck Lever94a6d752006-08-22 20:06:23 -04001903 error = NFS_PROTO(dir)->symlink(dir, dentry, page, pathlen, &attr);
Trond Myklebust1ca42382013-08-21 12:36:04 -04001904 trace_nfs_symlink_exit(dir, dentry, error);
Chuck Lever873101b2006-08-22 20:06:23 -04001905 if (error != 0) {
Niels de Vos1e8968c2013-12-17 18:20:16 +01001906 dfprintk(VFS, "NFS: symlink(%s/%lu, %pd, %s) error %d\n",
Chuck Lever873101b2006-08-22 20:06:23 -04001907 dir->i_sb->s_id, dir->i_ino,
Al Viro6de14722013-09-16 10:53:17 -04001908 dentry, symname, error);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001909 d_drop(dentry);
Chuck Lever873101b2006-08-22 20:06:23 -04001910 __free_page(page);
Chuck Lever873101b2006-08-22 20:06:23 -04001911 return error;
1912 }
1913
1914 /*
1915 * No big deal if we can't add this page to the page cache here.
1916 * READLINK will get the missing page from the server if needed.
1917 */
Mel Gormana0b8cab32013-07-03 15:02:32 -07001918 if (!add_to_page_cache_lru(page, dentry->d_inode->i_mapping, 0,
Chuck Lever873101b2006-08-22 20:06:23 -04001919 GFP_KERNEL)) {
Chuck Lever873101b2006-08-22 20:06:23 -04001920 SetPageUptodate(page);
1921 unlock_page(page);
Rafael Aquinia0b54ad2014-02-10 14:25:48 -08001922 /*
1923 * add_to_page_cache_lru() grabs an extra page refcount.
1924 * Drop it here to avoid leaking this page later.
1925 */
1926 page_cache_release(page);
Chuck Lever873101b2006-08-22 20:06:23 -04001927 } else
1928 __free_page(page);
1929
Chuck Lever873101b2006-08-22 20:06:23 -04001930 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001931}
Bryan Schumakerddda8e02012-07-30 16:05:23 -04001932EXPORT_SYMBOL_GPL(nfs_symlink);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001933
Bryan Schumaker597d9282012-07-16 16:39:10 -04001934int
Linus Torvalds1da177e2005-04-16 15:20:36 -07001935nfs_link(struct dentry *old_dentry, struct inode *dir, struct dentry *dentry)
1936{
1937 struct inode *inode = old_dentry->d_inode;
1938 int error;
1939
Al Viro6de14722013-09-16 10:53:17 -04001940 dfprintk(VFS, "NFS: link(%pd2 -> %pd2)\n",
1941 old_dentry, dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001942
Trond Myklebust1fd10852013-08-21 13:54:44 -04001943 trace_nfs_link_enter(inode, dir, dentry);
Bryan Schumaker57ec14c2012-06-20 15:53:44 -04001944 NFS_PROTO(inode)->return_delegation(inode);
Trond Myklebust9a3936a2009-10-26 08:09:46 -04001945
Trond Myklebust9697d232007-10-02 21:58:05 -04001946 d_drop(dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001947 error = NFS_PROTO(dir)->link(inode, dir, &dentry->d_name);
Trond Myklebustcf809552005-10-27 22:12:42 -04001948 if (error == 0) {
Al Viro7de9c6ee2010-10-23 11:11:40 -04001949 ihold(inode);
Trond Myklebust9697d232007-10-02 21:58:05 -04001950 d_add(dentry, inode);
Trond Myklebustcf809552005-10-27 22:12:42 -04001951 }
Trond Myklebust1fd10852013-08-21 13:54:44 -04001952 trace_nfs_link_exit(inode, dir, dentry, error);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001953 return error;
1954}
Bryan Schumakerddda8e02012-07-30 16:05:23 -04001955EXPORT_SYMBOL_GPL(nfs_link);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001956
1957/*
1958 * RENAME
1959 * FIXME: Some nfsds, like the Linux user space nfsd, may generate a
1960 * different file handle for the same inode after a rename (e.g. when
1961 * moving to a different directory). A fail-safe method to do so would
1962 * be to look up old_dir/old_name, create a link to new_dir/new_name and
1963 * rename the old file using the sillyrename stuff. This way, the original
1964 * file in old_dir will go away when the last process iput()s the inode.
1965 *
1966 * FIXED.
1967 *
1968 * It actually works quite well. One needs to have the possibility for
1969 * at least one ".nfs..." file in each directory the file ever gets
1970 * moved or linked to which happens automagically with the new
1971 * implementation that only depends on the dcache stuff instead of
1972 * using the inode layer
1973 *
1974 * Unfortunately, things are a little more complicated than indicated
1975 * above. For a cross-directory move, we want to make sure we can get
1976 * rid of the old inode after the operation. This means there must be
1977 * no pending writes (if it's a file), and the use count must be 1.
1978 * If these conditions are met, we can drop the dentries before doing
1979 * the rename.
1980 */
Bryan Schumaker597d9282012-07-16 16:39:10 -04001981int nfs_rename(struct inode *old_dir, struct dentry *old_dentry,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001982 struct inode *new_dir, struct dentry *new_dentry)
1983{
1984 struct inode *old_inode = old_dentry->d_inode;
1985 struct inode *new_inode = new_dentry->d_inode;
1986 struct dentry *dentry = NULL, *rehash = NULL;
Jeff Layton80a491f2014-03-17 07:06:56 -04001987 struct rpc_task *task;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001988 int error = -EBUSY;
1989
Al Viro6de14722013-09-16 10:53:17 -04001990 dfprintk(VFS, "NFS: rename(%pd2 -> %pd2, ct=%d)\n",
1991 old_dentry, new_dentry,
Al Viro84d08fa2013-07-05 18:59:33 +04001992 d_count(new_dentry));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001993
Trond Myklebust70ded202013-08-21 12:08:45 -04001994 trace_nfs_rename_enter(old_dir, old_dentry, new_dir, new_dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001995 /*
Miklos Szeredi28f79a12009-12-03 15:58:56 -05001996 * For non-directories, check whether the target is busy and if so,
1997 * make a copy of the dentry and then do a silly-rename. If the
1998 * silly-rename succeeds, the copied dentry is hashed and becomes
1999 * the new target.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002000 */
Miklos Szeredi27226102009-12-03 15:58:56 -05002001 if (new_inode && !S_ISDIR(new_inode->i_mode)) {
2002 /*
2003 * To prevent any new references to the target during the
2004 * rename, we unhash the dentry in advance.
2005 */
2006 if (!d_unhashed(new_dentry)) {
2007 d_drop(new_dentry);
2008 rehash = new_dentry;
2009 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002010
Al Viro84d08fa2013-07-05 18:59:33 +04002011 if (d_count(new_dentry) > 2) {
Miklos Szeredi27226102009-12-03 15:58:56 -05002012 int err;
2013
2014 /* copy the target dentry's name */
2015 dentry = d_alloc(new_dentry->d_parent,
2016 &new_dentry->d_name);
2017 if (!dentry)
2018 goto out;
2019
2020 /* silly-rename the existing target ... */
2021 err = nfs_sillyrename(new_dir, new_dentry);
Miklos Szeredi24e93022009-12-03 15:58:56 -05002022 if (err)
Miklos Szeredi27226102009-12-03 15:58:56 -05002023 goto out;
Miklos Szeredi24e93022009-12-03 15:58:56 -05002024
2025 new_dentry = dentry;
OGAWA Hirofumi56335932010-01-06 18:48:26 -05002026 rehash = NULL;
Miklos Szeredi24e93022009-12-03 15:58:56 -05002027 new_inode = NULL;
Miklos Szeredi27226102009-12-03 15:58:56 -05002028 }
Trond Myklebustb1e4adf2009-03-19 15:35:49 -04002029 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002030
Bryan Schumaker57ec14c2012-06-20 15:53:44 -04002031 NFS_PROTO(old_inode)->return_delegation(old_inode);
Trond Myklebustb1e4adf2009-03-19 15:35:49 -04002032 if (new_inode != NULL)
Bryan Schumaker57ec14c2012-06-20 15:53:44 -04002033 NFS_PROTO(new_inode)->return_delegation(new_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002034
Jeff Layton80a491f2014-03-17 07:06:56 -04002035 task = nfs_async_rename(old_dir, new_dir, old_dentry, new_dentry, NULL);
2036 if (IS_ERR(task)) {
2037 error = PTR_ERR(task);
2038 goto out;
2039 }
2040
2041 error = rpc_wait_for_completion_task(task);
2042 if (error == 0)
2043 error = task->tk_status;
2044 rpc_put_task(task);
Trond Myklebust5ba7cc42005-12-03 15:20:17 -05002045 nfs_mark_for_revalidate(old_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002046out:
2047 if (rehash)
2048 d_rehash(rehash);
Trond Myklebust70ded202013-08-21 12:08:45 -04002049 trace_nfs_rename_exit(old_dir, old_dentry,
2050 new_dir, new_dentry, error);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002051 if (!error) {
Trond Myklebustb1e4adf2009-03-19 15:35:49 -04002052 if (new_inode != NULL)
2053 nfs_drop_nlink(new_inode);
Mark Fasheh349457c2006-09-08 14:22:21 -07002054 d_move(old_dentry, new_dentry);
Chuck Lever8fb559f2007-09-24 15:40:16 -04002055 nfs_set_verifier(new_dentry,
2056 nfs_save_change_attribute(new_dir));
Trond Myklebustd45b9d82008-01-28 19:43:18 -05002057 } else if (error == -ENOENT)
2058 nfs_dentry_handle_enoent(old_dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002059
2060 /* new dentry created? */
2061 if (dentry)
2062 dput(dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002063 return error;
2064}
Bryan Schumakerddda8e02012-07-30 16:05:23 -04002065EXPORT_SYMBOL_GPL(nfs_rename);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002066
Trond Myklebustcfcea3e2006-07-25 11:28:18 -04002067static DEFINE_SPINLOCK(nfs_access_lru_lock);
2068static LIST_HEAD(nfs_access_lru_list);
2069static atomic_long_t nfs_access_nr_entries;
2070
Trond Myklebust3a505842014-07-21 13:53:48 -04002071static unsigned long nfs_access_max_cachesize = ULONG_MAX;
2072module_param(nfs_access_max_cachesize, ulong, 0644);
2073MODULE_PARM_DESC(nfs_access_max_cachesize, "NFS access maximum total cache length");
2074
Trond Myklebust1c3c07e2006-07-25 11:28:18 -04002075static void nfs_access_free_entry(struct nfs_access_entry *entry)
2076{
2077 put_rpccred(entry->cred);
NeilBrownf682a392014-07-14 11:28:20 +10002078 kfree_rcu(entry, rcu_head);
Peter Zijlstra4e857c52014-03-17 18:06:10 +01002079 smp_mb__before_atomic();
Trond Myklebustcfcea3e2006-07-25 11:28:18 -04002080 atomic_long_dec(&nfs_access_nr_entries);
Peter Zijlstra4e857c52014-03-17 18:06:10 +01002081 smp_mb__after_atomic();
Trond Myklebust1c3c07e2006-07-25 11:28:18 -04002082}
2083
Trond Myklebust1a81bb82010-05-13 12:51:06 -04002084static void nfs_access_free_list(struct list_head *head)
2085{
2086 struct nfs_access_entry *cache;
2087
2088 while (!list_empty(head)) {
2089 cache = list_entry(head->next, struct nfs_access_entry, lru);
2090 list_del(&cache->lru);
2091 nfs_access_free_entry(cache);
2092 }
2093}
2094
Trond Myklebust3a505842014-07-21 13:53:48 -04002095static unsigned long
2096nfs_do_access_cache_scan(unsigned int nr_to_scan)
Trond Myklebust979df722006-07-25 11:28:19 -04002097{
2098 LIST_HEAD(head);
Trond Myklebustaa510da2010-09-29 15:11:56 -04002099 struct nfs_inode *nfsi, *next;
Trond Myklebust979df722006-07-25 11:28:19 -04002100 struct nfs_access_entry *cache;
Dave Chinner1ab6c492013-08-28 10:18:09 +10002101 long freed = 0;
Trond Myklebust979df722006-07-25 11:28:19 -04002102
Trond Myklebusta50f7952007-06-05 19:23:43 -04002103 spin_lock(&nfs_access_lru_lock);
Trond Myklebustaa510da2010-09-29 15:11:56 -04002104 list_for_each_entry_safe(nfsi, next, &nfs_access_lru_list, access_cache_inode_lru) {
Trond Myklebust979df722006-07-25 11:28:19 -04002105 struct inode *inode;
2106
2107 if (nr_to_scan-- == 0)
2108 break;
Trond Myklebust9c7e7e22010-05-13 12:51:06 -04002109 inode = &nfsi->vfs_inode;
Trond Myklebust979df722006-07-25 11:28:19 -04002110 spin_lock(&inode->i_lock);
2111 if (list_empty(&nfsi->access_cache_entry_lru))
2112 goto remove_lru_entry;
2113 cache = list_entry(nfsi->access_cache_entry_lru.next,
2114 struct nfs_access_entry, lru);
2115 list_move(&cache->lru, &head);
2116 rb_erase(&cache->rb_node, &nfsi->access_cache);
Dave Chinner1ab6c492013-08-28 10:18:09 +10002117 freed++;
Trond Myklebust979df722006-07-25 11:28:19 -04002118 if (!list_empty(&nfsi->access_cache_entry_lru))
2119 list_move_tail(&nfsi->access_cache_inode_lru,
2120 &nfs_access_lru_list);
2121 else {
2122remove_lru_entry:
2123 list_del_init(&nfsi->access_cache_inode_lru);
Peter Zijlstra4e857c52014-03-17 18:06:10 +01002124 smp_mb__before_atomic();
Trond Myklebust979df722006-07-25 11:28:19 -04002125 clear_bit(NFS_INO_ACL_LRU_SET, &nfsi->flags);
Peter Zijlstra4e857c52014-03-17 18:06:10 +01002126 smp_mb__after_atomic();
Trond Myklebust979df722006-07-25 11:28:19 -04002127 }
Trond Myklebust59844a92010-05-26 08:42:24 -04002128 spin_unlock(&inode->i_lock);
Trond Myklebust979df722006-07-25 11:28:19 -04002129 }
2130 spin_unlock(&nfs_access_lru_lock);
Trond Myklebust1a81bb82010-05-13 12:51:06 -04002131 nfs_access_free_list(&head);
Dave Chinner1ab6c492013-08-28 10:18:09 +10002132 return freed;
2133}
2134
2135unsigned long
Trond Myklebust3a505842014-07-21 13:53:48 -04002136nfs_access_cache_scan(struct shrinker *shrink, struct shrink_control *sc)
2137{
2138 int nr_to_scan = sc->nr_to_scan;
2139 gfp_t gfp_mask = sc->gfp_mask;
2140
2141 if ((gfp_mask & GFP_KERNEL) != GFP_KERNEL)
2142 return SHRINK_STOP;
2143 return nfs_do_access_cache_scan(nr_to_scan);
2144}
2145
2146
2147unsigned long
Dave Chinner1ab6c492013-08-28 10:18:09 +10002148nfs_access_cache_count(struct shrinker *shrink, struct shrink_control *sc)
2149{
Glauber Costa55f841c2013-08-28 10:17:53 +10002150 return vfs_pressure_ratio(atomic_long_read(&nfs_access_nr_entries));
Trond Myklebust979df722006-07-25 11:28:19 -04002151}
2152
Trond Myklebust3a505842014-07-21 13:53:48 -04002153static void
2154nfs_access_cache_enforce_limit(void)
2155{
2156 long nr_entries = atomic_long_read(&nfs_access_nr_entries);
2157 unsigned long diff;
2158 unsigned int nr_to_scan;
2159
2160 if (nr_entries < 0 || nr_entries <= nfs_access_max_cachesize)
2161 return;
2162 nr_to_scan = 100;
2163 diff = nr_entries - nfs_access_max_cachesize;
2164 if (diff < nr_to_scan)
2165 nr_to_scan = diff;
2166 nfs_do_access_cache_scan(nr_to_scan);
2167}
2168
Trond Myklebust1a81bb82010-05-13 12:51:06 -04002169static void __nfs_access_zap_cache(struct nfs_inode *nfsi, struct list_head *head)
Trond Myklebust1c3c07e2006-07-25 11:28:18 -04002170{
Trond Myklebust1c3c07e2006-07-25 11:28:18 -04002171 struct rb_root *root_node = &nfsi->access_cache;
Trond Myklebust1a81bb82010-05-13 12:51:06 -04002172 struct rb_node *n;
Trond Myklebust1c3c07e2006-07-25 11:28:18 -04002173 struct nfs_access_entry *entry;
2174
2175 /* Unhook entries from the cache */
2176 while ((n = rb_first(root_node)) != NULL) {
2177 entry = rb_entry(n, struct nfs_access_entry, rb_node);
2178 rb_erase(n, root_node);
Trond Myklebust1a81bb82010-05-13 12:51:06 -04002179 list_move(&entry->lru, head);
Trond Myklebust1c3c07e2006-07-25 11:28:18 -04002180 }
2181 nfsi->cache_validity &= ~NFS_INO_INVALID_ACCESS;
Trond Myklebust1c3c07e2006-07-25 11:28:18 -04002182}
2183
2184void nfs_access_zap_cache(struct inode *inode)
2185{
Trond Myklebust1a81bb82010-05-13 12:51:06 -04002186 LIST_HEAD(head);
2187
2188 if (test_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags) == 0)
2189 return;
Trond Myklebustcfcea3e2006-07-25 11:28:18 -04002190 /* Remove from global LRU init */
Trond Myklebust1a81bb82010-05-13 12:51:06 -04002191 spin_lock(&nfs_access_lru_lock);
2192 if (test_and_clear_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags))
Trond Myklebustcfcea3e2006-07-25 11:28:18 -04002193 list_del_init(&NFS_I(inode)->access_cache_inode_lru);
Trond Myklebustcfcea3e2006-07-25 11:28:18 -04002194
Trond Myklebust1c3c07e2006-07-25 11:28:18 -04002195 spin_lock(&inode->i_lock);
Trond Myklebust1a81bb82010-05-13 12:51:06 -04002196 __nfs_access_zap_cache(NFS_I(inode), &head);
2197 spin_unlock(&inode->i_lock);
2198 spin_unlock(&nfs_access_lru_lock);
2199 nfs_access_free_list(&head);
Trond Myklebust1c3c07e2006-07-25 11:28:18 -04002200}
Bryan Schumaker1c606fb2012-07-30 16:05:24 -04002201EXPORT_SYMBOL_GPL(nfs_access_zap_cache);
Trond Myklebust1c3c07e2006-07-25 11:28:18 -04002202
2203static struct nfs_access_entry *nfs_access_search_rbtree(struct inode *inode, struct rpc_cred *cred)
2204{
2205 struct rb_node *n = NFS_I(inode)->access_cache.rb_node;
2206 struct nfs_access_entry *entry;
2207
2208 while (n != NULL) {
2209 entry = rb_entry(n, struct nfs_access_entry, rb_node);
2210
2211 if (cred < entry->cred)
2212 n = n->rb_left;
2213 else if (cred > entry->cred)
2214 n = n->rb_right;
2215 else
2216 return entry;
2217 }
2218 return NULL;
2219}
2220
Trond Myklebustaf22f942007-08-10 17:45:10 -04002221static int nfs_access_get_cached(struct inode *inode, struct rpc_cred *cred, struct nfs_access_entry *res)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002222{
Chuck Lever55296802005-08-18 11:24:09 -07002223 struct nfs_inode *nfsi = NFS_I(inode);
Trond Myklebust1c3c07e2006-07-25 11:28:18 -04002224 struct nfs_access_entry *cache;
2225 int err = -ENOENT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002226
Trond Myklebust1c3c07e2006-07-25 11:28:18 -04002227 spin_lock(&inode->i_lock);
2228 if (nfsi->cache_validity & NFS_INO_INVALID_ACCESS)
2229 goto out_zap;
2230 cache = nfs_access_search_rbtree(inode, cred);
2231 if (cache == NULL)
2232 goto out;
Trond Myklebustb4d23142010-03-10 15:21:44 -05002233 if (!nfs_have_delegated_attributes(inode) &&
Peter Staubach64672d52008-12-23 15:21:56 -05002234 !time_in_range_open(jiffies, cache->jiffies, cache->jiffies + nfsi->attrtimeo))
Trond Myklebust1c3c07e2006-07-25 11:28:18 -04002235 goto out_stale;
2236 res->jiffies = cache->jiffies;
2237 res->cred = cache->cred;
2238 res->mask = cache->mask;
Trond Myklebustcfcea3e2006-07-25 11:28:18 -04002239 list_move_tail(&cache->lru, &nfsi->access_cache_entry_lru);
Trond Myklebust1c3c07e2006-07-25 11:28:18 -04002240 err = 0;
2241out:
2242 spin_unlock(&inode->i_lock);
2243 return err;
2244out_stale:
2245 rb_erase(&cache->rb_node, &nfsi->access_cache);
Trond Myklebustcfcea3e2006-07-25 11:28:18 -04002246 list_del(&cache->lru);
Trond Myklebust1c3c07e2006-07-25 11:28:18 -04002247 spin_unlock(&inode->i_lock);
2248 nfs_access_free_entry(cache);
2249 return -ENOENT;
2250out_zap:
Trond Myklebust1a81bb82010-05-13 12:51:06 -04002251 spin_unlock(&inode->i_lock);
2252 nfs_access_zap_cache(inode);
Trond Myklebust1c3c07e2006-07-25 11:28:18 -04002253 return -ENOENT;
2254}
2255
NeilBrownf682a392014-07-14 11:28:20 +10002256static int nfs_access_get_cached_rcu(struct inode *inode, struct rpc_cred *cred, struct nfs_access_entry *res)
2257{
2258 /* Only check the most recently returned cache entry,
2259 * but do it without locking.
2260 */
2261 struct nfs_inode *nfsi = NFS_I(inode);
2262 struct nfs_access_entry *cache;
2263 int err = -ECHILD;
2264 struct list_head *lh;
2265
2266 rcu_read_lock();
2267 if (nfsi->cache_validity & NFS_INO_INVALID_ACCESS)
2268 goto out;
2269 lh = rcu_dereference(nfsi->access_cache_entry_lru.prev);
2270 cache = list_entry(lh, struct nfs_access_entry, lru);
2271 if (lh == &nfsi->access_cache_entry_lru ||
2272 cred != cache->cred)
2273 cache = NULL;
2274 if (cache == NULL)
2275 goto out;
2276 if (!nfs_have_delegated_attributes(inode) &&
2277 !time_in_range_open(jiffies, cache->jiffies, cache->jiffies + nfsi->attrtimeo))
2278 goto out;
2279 res->jiffies = cache->jiffies;
2280 res->cred = cache->cred;
2281 res->mask = cache->mask;
2282 err = 0;
2283out:
2284 rcu_read_unlock();
2285 return err;
2286}
2287
Trond Myklebust1c3c07e2006-07-25 11:28:18 -04002288static void nfs_access_add_rbtree(struct inode *inode, struct nfs_access_entry *set)
2289{
Trond Myklebustcfcea3e2006-07-25 11:28:18 -04002290 struct nfs_inode *nfsi = NFS_I(inode);
2291 struct rb_root *root_node = &nfsi->access_cache;
Trond Myklebust1c3c07e2006-07-25 11:28:18 -04002292 struct rb_node **p = &root_node->rb_node;
2293 struct rb_node *parent = NULL;
2294 struct nfs_access_entry *entry;
2295
2296 spin_lock(&inode->i_lock);
2297 while (*p != NULL) {
2298 parent = *p;
2299 entry = rb_entry(parent, struct nfs_access_entry, rb_node);
2300
2301 if (set->cred < entry->cred)
2302 p = &parent->rb_left;
2303 else if (set->cred > entry->cred)
2304 p = &parent->rb_right;
2305 else
2306 goto found;
2307 }
2308 rb_link_node(&set->rb_node, parent, p);
2309 rb_insert_color(&set->rb_node, root_node);
Trond Myklebustcfcea3e2006-07-25 11:28:18 -04002310 list_add_tail(&set->lru, &nfsi->access_cache_entry_lru);
Trond Myklebust1c3c07e2006-07-25 11:28:18 -04002311 spin_unlock(&inode->i_lock);
2312 return;
2313found:
2314 rb_replace_node(parent, &set->rb_node, root_node);
Trond Myklebustcfcea3e2006-07-25 11:28:18 -04002315 list_add_tail(&set->lru, &nfsi->access_cache_entry_lru);
2316 list_del(&entry->lru);
Trond Myklebust1c3c07e2006-07-25 11:28:18 -04002317 spin_unlock(&inode->i_lock);
2318 nfs_access_free_entry(entry);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002319}
2320
Weston Andros Adamson6168f622012-09-10 14:00:46 -04002321void nfs_access_add_cache(struct inode *inode, struct nfs_access_entry *set)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002322{
Trond Myklebust1c3c07e2006-07-25 11:28:18 -04002323 struct nfs_access_entry *cache = kmalloc(sizeof(*cache), GFP_KERNEL);
2324 if (cache == NULL)
2325 return;
2326 RB_CLEAR_NODE(&cache->rb_node);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002327 cache->jiffies = set->jiffies;
Trond Myklebust1c3c07e2006-07-25 11:28:18 -04002328 cache->cred = get_rpccred(set->cred);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002329 cache->mask = set->mask;
Trond Myklebust1c3c07e2006-07-25 11:28:18 -04002330
NeilBrownf682a392014-07-14 11:28:20 +10002331 /* The above field assignments must be visible
2332 * before this item appears on the lru. We cannot easily
2333 * use rcu_assign_pointer, so just force the memory barrier.
2334 */
2335 smp_wmb();
Trond Myklebust1c3c07e2006-07-25 11:28:18 -04002336 nfs_access_add_rbtree(inode, cache);
Trond Myklebustcfcea3e2006-07-25 11:28:18 -04002337
2338 /* Update accounting */
Peter Zijlstra4e857c52014-03-17 18:06:10 +01002339 smp_mb__before_atomic();
Trond Myklebustcfcea3e2006-07-25 11:28:18 -04002340 atomic_long_inc(&nfs_access_nr_entries);
Peter Zijlstra4e857c52014-03-17 18:06:10 +01002341 smp_mb__after_atomic();
Trond Myklebustcfcea3e2006-07-25 11:28:18 -04002342
2343 /* Add inode to global LRU list */
Trond Myklebust1a81bb82010-05-13 12:51:06 -04002344 if (!test_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags)) {
Trond Myklebustcfcea3e2006-07-25 11:28:18 -04002345 spin_lock(&nfs_access_lru_lock);
Trond Myklebust1a81bb82010-05-13 12:51:06 -04002346 if (!test_and_set_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags))
2347 list_add_tail(&NFS_I(inode)->access_cache_inode_lru,
2348 &nfs_access_lru_list);
Trond Myklebustcfcea3e2006-07-25 11:28:18 -04002349 spin_unlock(&nfs_access_lru_lock);
2350 }
Trond Myklebust3a505842014-07-21 13:53:48 -04002351 nfs_access_cache_enforce_limit();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002352}
Weston Andros Adamson6168f622012-09-10 14:00:46 -04002353EXPORT_SYMBOL_GPL(nfs_access_add_cache);
2354
2355void nfs_access_set_mask(struct nfs_access_entry *entry, u32 access_result)
2356{
2357 entry->mask = 0;
2358 if (access_result & NFS4_ACCESS_READ)
2359 entry->mask |= MAY_READ;
2360 if (access_result &
2361 (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
2362 entry->mask |= MAY_WRITE;
2363 if (access_result & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
2364 entry->mask |= MAY_EXEC;
2365}
2366EXPORT_SYMBOL_GPL(nfs_access_set_mask);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002367
2368static int nfs_do_access(struct inode *inode, struct rpc_cred *cred, int mask)
2369{
2370 struct nfs_access_entry cache;
2371 int status;
2372
Trond Myklebustf4ce1292013-08-19 18:59:33 -04002373 trace_nfs_access_enter(inode);
2374
NeilBrownf682a392014-07-14 11:28:20 +10002375 status = nfs_access_get_cached_rcu(inode, cred, &cache);
2376 if (status != 0)
2377 status = nfs_access_get_cached(inode, cred, &cache);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002378 if (status == 0)
Trond Myklebustf4ce1292013-08-19 18:59:33 -04002379 goto out_cached;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002380
NeilBrownf3324a22014-07-14 11:28:20 +10002381 status = -ECHILD;
2382 if (mask & MAY_NOT_BLOCK)
2383 goto out;
2384
Linus Torvalds1da177e2005-04-16 15:20:36 -07002385 /* Be clever: ask server to check for all possible rights */
2386 cache.mask = MAY_EXEC | MAY_WRITE | MAY_READ;
2387 cache.cred = cred;
2388 cache.jiffies = jiffies;
2389 status = NFS_PROTO(inode)->access(inode, &cache);
Suresh Jayaramana71ee332009-03-10 20:33:21 -04002390 if (status != 0) {
2391 if (status == -ESTALE) {
2392 nfs_zap_caches(inode);
2393 if (!S_ISDIR(inode->i_mode))
2394 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
2395 }
Trond Myklebustf4ce1292013-08-19 18:59:33 -04002396 goto out;
Suresh Jayaramana71ee332009-03-10 20:33:21 -04002397 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002398 nfs_access_add_cache(inode, &cache);
Trond Myklebustf4ce1292013-08-19 18:59:33 -04002399out_cached:
2400 if ((mask & ~cache.mask & (MAY_READ | MAY_WRITE | MAY_EXEC)) != 0)
2401 status = -EACCES;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002402out:
Trond Myklebustf4ce1292013-08-19 18:59:33 -04002403 trace_nfs_access_exit(inode, status);
2404 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002405}
2406
Trond Myklebustaf22f942007-08-10 17:45:10 -04002407static int nfs_open_permission_mask(int openflags)
2408{
2409 int mask = 0;
2410
Weston Andros Adamsonf8d9a892013-01-03 16:42:29 -05002411 if (openflags & __FMODE_EXEC) {
2412 /* ONLY check exec rights */
2413 mask = MAY_EXEC;
2414 } else {
2415 if ((openflags & O_ACCMODE) != O_WRONLY)
2416 mask |= MAY_READ;
2417 if ((openflags & O_ACCMODE) != O_RDONLY)
2418 mask |= MAY_WRITE;
2419 }
2420
Trond Myklebustaf22f942007-08-10 17:45:10 -04002421 return mask;
2422}
2423
2424int nfs_may_open(struct inode *inode, struct rpc_cred *cred, int openflags)
2425{
2426 return nfs_do_access(inode, cred, nfs_open_permission_mask(openflags));
2427}
Bryan Schumaker89d77c82012-07-30 16:05:25 -04002428EXPORT_SYMBOL_GPL(nfs_may_open);
Trond Myklebustaf22f942007-08-10 17:45:10 -04002429
Al Viro10556cb2011-06-20 19:28:19 -04002430int nfs_permission(struct inode *inode, int mask)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002431{
2432 struct rpc_cred *cred;
2433 int res = 0;
2434
Chuck Lever91d5b472006-03-20 13:44:14 -05002435 nfs_inc_stats(inode, NFSIOS_VFSACCESS);
2436
Al Viroe6305c42008-07-15 21:03:57 -04002437 if ((mask & (MAY_READ | MAY_WRITE | MAY_EXEC)) == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002438 goto out;
2439 /* Is this sys_access() ? */
Eric Paris9cfcac82010-07-23 11:43:51 -04002440 if (mask & (MAY_ACCESS | MAY_CHDIR))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002441 goto force_lookup;
2442
2443 switch (inode->i_mode & S_IFMT) {
2444 case S_IFLNK:
2445 goto out;
2446 case S_IFREG:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002447 break;
2448 case S_IFDIR:
2449 /*
2450 * Optimize away all write operations, since the server
2451 * will check permissions when we perform the op.
2452 */
2453 if ((mask & MAY_WRITE) && !(mask & MAY_READ))
2454 goto out;
2455 }
2456
2457force_lookup:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002458 if (!NFS_PROTO(inode)->access)
2459 goto out_notsup;
2460
NeilBrownf3324a22014-07-14 11:28:20 +10002461 /* Always try fast lookups first */
2462 rcu_read_lock();
2463 cred = rpc_lookup_cred_nonblock();
2464 if (!IS_ERR(cred))
2465 res = nfs_do_access(inode, cred, mask|MAY_NOT_BLOCK);
2466 else
Linus Torvalds1da177e2005-04-16 15:20:36 -07002467 res = PTR_ERR(cred);
NeilBrownf3324a22014-07-14 11:28:20 +10002468 rcu_read_unlock();
2469 if (res == -ECHILD && !(mask & MAY_NOT_BLOCK)) {
2470 /* Fast lookup failed, try the slow way */
2471 cred = rpc_lookup_cred();
2472 if (!IS_ERR(cred)) {
2473 res = nfs_do_access(inode, cred, mask);
2474 put_rpccred(cred);
2475 } else
2476 res = PTR_ERR(cred);
2477 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002478out:
Miklos Szeredif696a362008-07-31 13:41:58 +02002479 if (!res && (mask & MAY_EXEC) && !execute_ok(inode))
2480 res = -EACCES;
2481
Niels de Vos1e8968c2013-12-17 18:20:16 +01002482 dfprintk(VFS, "NFS: permission(%s/%lu), mask=0x%x, res=%d\n",
Chuck Lever1e7cb3d2006-03-20 13:44:24 -05002483 inode->i_sb->s_id, inode->i_ino, mask, res);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002484 return res;
2485out_notsup:
NeilBrownd51ac1a2014-07-14 11:28:20 +10002486 if (mask & MAY_NOT_BLOCK)
2487 return -ECHILD;
2488
Linus Torvalds1da177e2005-04-16 15:20:36 -07002489 res = nfs_revalidate_inode(NFS_SERVER(inode), inode);
2490 if (res == 0)
Al Viro2830ba72011-06-20 19:16:29 -04002491 res = generic_permission(inode, mask);
Chuck Lever1e7cb3d2006-03-20 13:44:24 -05002492 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002493}
Bryan Schumakerddda8e02012-07-30 16:05:23 -04002494EXPORT_SYMBOL_GPL(nfs_permission);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002495
2496/*
2497 * Local variables:
2498 * version-control: t
2499 * kept-new-versions: 5
2500 * End:
2501 */