blob: 8789210c6905a666c86612d9ac080f567ddbd89f [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
20#include <linux/time.h>
21#include <linux/errno.h>
22#include <linux/stat.h>
23#include <linux/fcntl.h>
24#include <linux/string.h>
25#include <linux/kernel.h>
26#include <linux/slab.h>
27#include <linux/mm.h>
28#include <linux/sunrpc/clnt.h>
29#include <linux/nfs_fs.h>
30#include <linux/nfs_mount.h>
31#include <linux/pagemap.h>
Chuck Lever873101b2006-08-22 20:06:23 -040032#include <linux/pagevec.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070033#include <linux/namei.h>
David Howells54ceac42006-08-22 20:06:13 -040034#include <linux/mount.h>
Alexey Dobriyane8edc6e2007-05-21 01:22:52 +040035#include <linux/sched.h>
Catalin Marinas04e4bd12010-11-11 12:53:47 +000036#include <linux/kmemleak.h>
Aneesh Kumar K.V64c2ce82010-12-09 11:35:25 +000037#include <linux/xattr.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070038
39#include "delegation.h"
Chuck Lever91d5b472006-03-20 13:44:14 -050040#include "iostat.h"
Adrian Bunk4c30d562007-11-21 15:04:31 -080041#include "internal.h"
Trond Myklebustcd9a1c02010-09-17 10:56:50 -040042#include "fscache.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070043
Linus Torvalds1da177e2005-04-16 15:20:36 -070044/* #define NFS_DEBUG_VERBOSE 1 */
45
46static int nfs_opendir(struct inode *, struct file *);
Bryan Schumaker480c2002011-03-23 14:48:29 -040047static int nfs_closedir(struct inode *, struct file *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070048static int nfs_readdir(struct file *, void *, filldir_t);
49static struct dentry *nfs_lookup(struct inode *, struct dentry *, struct nameidata *);
Al Viro4acdaf22011-07-26 01:42:34 -040050static int nfs_create(struct inode *, struct dentry *, umode_t, struct nameidata *);
Al Viro18bb1db2011-07-26 01:41:39 -040051static int nfs_mkdir(struct inode *, struct dentry *, umode_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -070052static int nfs_rmdir(struct inode *, struct dentry *);
53static int nfs_unlink(struct inode *, struct dentry *);
54static int nfs_symlink(struct inode *, struct dentry *, const char *);
55static int nfs_link(struct dentry *, struct inode *, struct dentry *);
Al Viro1a67aaf2011-07-26 01:52:52 -040056static int nfs_mknod(struct inode *, struct dentry *, umode_t, dev_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -070057static int nfs_rename(struct inode *, struct dentry *,
58 struct inode *, struct dentry *);
Josef Bacik02c24a82011-07-16 20:44:56 -040059static int nfs_fsync_dir(struct file *, loff_t, loff_t, int);
Trond Myklebustf0dd2132005-06-22 17:16:29 +000060static loff_t nfs_llseek_dir(struct file *, loff_t, int);
Trond Myklebust11de3b12010-12-01 14:17:06 -050061static void nfs_readdir_clear_array(struct page*);
Linus Torvalds1da177e2005-04-16 15:20:36 -070062
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -080063const struct file_operations nfs_dir_operations = {
Trond Myklebustf0dd2132005-06-22 17:16:29 +000064 .llseek = nfs_llseek_dir,
Linus Torvalds1da177e2005-04-16 15:20:36 -070065 .read = generic_read_dir,
66 .readdir = nfs_readdir,
67 .open = nfs_opendir,
Bryan Schumaker480c2002011-03-23 14:48:29 -040068 .release = nfs_closedir,
Linus Torvalds1da177e2005-04-16 15:20:36 -070069 .fsync = nfs_fsync_dir,
70};
71
Arjan van de Ven92e1d5b2007-02-12 00:55:39 -080072const struct inode_operations nfs_dir_inode_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070073 .create = nfs_create,
74 .lookup = nfs_lookup,
75 .link = nfs_link,
76 .unlink = nfs_unlink,
77 .symlink = nfs_symlink,
78 .mkdir = nfs_mkdir,
79 .rmdir = nfs_rmdir,
80 .mknod = nfs_mknod,
81 .rename = nfs_rename,
82 .permission = nfs_permission,
83 .getattr = nfs_getattr,
84 .setattr = nfs_setattr,
85};
86
Trond Myklebust11de3b12010-12-01 14:17:06 -050087const struct address_space_operations nfs_dir_aops = {
88 .freepage = nfs_readdir_clear_array,
Bryan Schumakerd1bacf92010-09-24 14:48:42 -040089};
90
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +000091#ifdef CONFIG_NFS_V3
Arjan van de Ven92e1d5b2007-02-12 00:55:39 -080092const struct inode_operations nfs3_dir_inode_operations = {
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +000093 .create = nfs_create,
94 .lookup = nfs_lookup,
95 .link = nfs_link,
96 .unlink = nfs_unlink,
97 .symlink = nfs_symlink,
98 .mkdir = nfs_mkdir,
99 .rmdir = nfs_rmdir,
100 .mknod = nfs_mknod,
101 .rename = nfs_rename,
102 .permission = nfs_permission,
103 .getattr = nfs_getattr,
104 .setattr = nfs_setattr,
105 .listxattr = nfs3_listxattr,
106 .getxattr = nfs3_getxattr,
107 .setxattr = nfs3_setxattr,
108 .removexattr = nfs3_removexattr,
109};
110#endif /* CONFIG_NFS_V3 */
111
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112#ifdef CONFIG_NFS_V4
113
114static struct dentry *nfs_atomic_lookup(struct inode *, struct dentry *, struct nameidata *);
Al Viro4acdaf22011-07-26 01:42:34 -0400115static int nfs_open_create(struct inode *dir, struct dentry *dentry, umode_t mode, struct nameidata *nd);
Arjan van de Ven92e1d5b2007-02-12 00:55:39 -0800116const struct inode_operations nfs4_dir_inode_operations = {
Trond Myklebustc0204fd2010-09-17 10:56:51 -0400117 .create = nfs_open_create,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118 .lookup = nfs_atomic_lookup,
119 .link = nfs_link,
120 .unlink = nfs_unlink,
121 .symlink = nfs_symlink,
122 .mkdir = nfs_mkdir,
123 .rmdir = nfs_rmdir,
124 .mknod = nfs_mknod,
125 .rename = nfs_rename,
126 .permission = nfs_permission,
127 .getattr = nfs_getattr,
128 .setattr = nfs_setattr,
Aneesh Kumar K.V64c2ce82010-12-09 11:35:25 +0000129 .getxattr = generic_getxattr,
130 .setxattr = generic_setxattr,
131 .listxattr = generic_listxattr,
132 .removexattr = generic_removexattr,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133};
134
135#endif /* CONFIG_NFS_V4 */
136
Trond Myklebust0c030802011-07-30 12:45:35 -0400137static struct nfs_open_dir_context *alloc_nfs_open_dir_context(struct inode *dir, struct rpc_cred *cred)
Bryan Schumaker480c2002011-03-23 14:48:29 -0400138{
139 struct nfs_open_dir_context *ctx;
140 ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
141 if (ctx != NULL) {
Bryan Schumaker8ef2ce32011-03-23 15:04:31 -0400142 ctx->duped = 0;
Trond Myklebust0c030802011-07-30 12:45:35 -0400143 ctx->attr_gencount = NFS_I(dir)->attr_gencount;
Bryan Schumaker480c2002011-03-23 14:48:29 -0400144 ctx->dir_cookie = 0;
Bryan Schumaker8ef2ce32011-03-23 15:04:31 -0400145 ctx->dup_cookie = 0;
Bryan Schumaker480c2002011-03-23 14:48:29 -0400146 ctx->cred = get_rpccred(cred);
Trond Myklebust0c030802011-07-30 12:45:35 -0400147 return ctx;
148 }
149 return ERR_PTR(-ENOMEM);
Bryan Schumaker480c2002011-03-23 14:48:29 -0400150}
151
152static void put_nfs_open_dir_context(struct nfs_open_dir_context *ctx)
153{
154 put_rpccred(ctx->cred);
155 kfree(ctx);
156}
157
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158/*
159 * Open file
160 */
161static int
162nfs_opendir(struct inode *inode, struct file *filp)
163{
Bryan Schumaker480c2002011-03-23 14:48:29 -0400164 int res = 0;
165 struct nfs_open_dir_context *ctx;
166 struct rpc_cred *cred;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167
Chuck Lever6da24bc2008-06-11 17:55:58 -0400168 dfprintk(FILE, "NFS: open dir(%s/%s)\n",
Chuck Levercc0dd2d2008-06-11 17:55:42 -0400169 filp->f_path.dentry->d_parent->d_name.name,
170 filp->f_path.dentry->d_name.name);
171
172 nfs_inc_stats(inode, NFSIOS_VFSOPEN);
Chuck Lever1e7cb3d2006-03-20 13:44:24 -0500173
Bryan Schumaker480c2002011-03-23 14:48:29 -0400174 cred = rpc_lookup_cred();
175 if (IS_ERR(cred))
176 return PTR_ERR(cred);
Trond Myklebust0c030802011-07-30 12:45:35 -0400177 ctx = alloc_nfs_open_dir_context(inode, cred);
Bryan Schumaker480c2002011-03-23 14:48:29 -0400178 if (IS_ERR(ctx)) {
179 res = PTR_ERR(ctx);
180 goto out;
181 }
182 filp->private_data = ctx;
Neil Brownf5a73672010-08-10 10:20:05 -0400183 if (filp->f_path.dentry == filp->f_path.mnt->mnt_root) {
184 /* This is a mountpoint, so d_revalidate will never
185 * have been called, so we need to refresh the
186 * inode (for close-open consistency) ourselves.
187 */
188 __nfs_revalidate_inode(NFS_SERVER(inode), inode);
189 }
Bryan Schumaker480c2002011-03-23 14:48:29 -0400190out:
191 put_rpccred(cred);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192 return res;
193}
194
Bryan Schumaker480c2002011-03-23 14:48:29 -0400195static int
196nfs_closedir(struct inode *inode, struct file *filp)
197{
198 put_nfs_open_dir_context(filp->private_data);
199 return 0;
200}
201
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400202struct nfs_cache_array_entry {
203 u64 cookie;
204 u64 ino;
205 struct qstr string;
Trond Myklebust0b26a0b2010-11-20 14:26:44 -0500206 unsigned char d_type;
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400207};
208
209struct nfs_cache_array {
Chuck Lever88b8e132012-03-01 17:00:23 -0500210 int size;
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400211 int eof_index;
212 u64 last_cookie;
213 struct nfs_cache_array_entry array[0];
214};
215
Chuck Lever573c4e12010-12-14 14:58:11 +0000216typedef int (*decode_dirent_t)(struct xdr_stream *, struct nfs_entry *, int);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217typedef struct {
218 struct file *file;
219 struct page *page;
220 unsigned long page_index;
Trond Myklebustf0dd2132005-06-22 17:16:29 +0000221 u64 *dir_cookie;
Trond Myklebust0aded702010-11-30 21:56:32 -0500222 u64 last_cookie;
Trond Myklebustf0dd2132005-06-22 17:16:29 +0000223 loff_t current_index;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224 decode_dirent_t decode;
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400225
Neil Brown1f4eab72007-04-16 09:35:27 +1000226 unsigned long timestamp;
Trond Myklebust4704f0e2008-10-14 19:16:07 -0400227 unsigned long gencount;
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400228 unsigned int cache_entry_index;
229 unsigned int plus:1;
230 unsigned int eof:1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231} nfs_readdir_descriptor_t;
232
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400233/*
234 * The caller is responsible for calling nfs_readdir_release_array(page)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235 */
236static
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400237struct nfs_cache_array *nfs_readdir_get_array(struct page *page)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238{
Trond Myklebust8cd51a02010-11-15 20:26:22 -0500239 void *ptr;
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400240 if (page == NULL)
241 return ERR_PTR(-EIO);
Trond Myklebust8cd51a02010-11-15 20:26:22 -0500242 ptr = kmap(page);
243 if (ptr == NULL)
244 return ERR_PTR(-ENOMEM);
245 return ptr;
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400246}
247
248static
249void nfs_readdir_release_array(struct page *page)
250{
251 kunmap(page);
252}
253
254/*
255 * we are freeing strings created by nfs_add_to_readdir_array()
256 */
257static
Trond Myklebust11de3b12010-12-01 14:17:06 -0500258void nfs_readdir_clear_array(struct page *page)
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400259{
Trond Myklebust11de3b12010-12-01 14:17:06 -0500260 struct nfs_cache_array *array;
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400261 int i;
Trond Myklebust8cd51a02010-11-15 20:26:22 -0500262
Cong Wang2b86ce22011-11-25 23:14:33 +0800263 array = kmap_atomic(page);
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400264 for (i = 0; i < array->size; i++)
265 kfree(array->array[i].string.name);
Cong Wang2b86ce22011-11-25 23:14:33 +0800266 kunmap_atomic(array);
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400267}
268
269/*
270 * the caller is responsible for freeing qstr.name
271 * when called by nfs_readdir_add_to_array, the strings will be freed in
272 * nfs_clear_readdir_array()
273 */
274static
Trond Myklebust4a201d62010-10-23 14:53:23 -0400275int nfs_readdir_make_qstr(struct qstr *string, const char *name, unsigned int len)
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400276{
277 string->len = len;
278 string->name = kmemdup(name, len, GFP_KERNEL);
Trond Myklebust4a201d62010-10-23 14:53:23 -0400279 if (string->name == NULL)
280 return -ENOMEM;
Catalin Marinas04e4bd12010-11-11 12:53:47 +0000281 /*
282 * Avoid a kmemleak false positive. The pointer to the name is stored
283 * in a page cache page which kmemleak does not scan.
284 */
285 kmemleak_not_leak(string->name);
Trond Myklebust4a201d62010-10-23 14:53:23 -0400286 string->hash = full_name_hash(name, len);
287 return 0;
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400288}
289
290static
291int nfs_readdir_add_to_array(struct nfs_entry *entry, struct page *page)
292{
293 struct nfs_cache_array *array = nfs_readdir_get_array(page);
Trond Myklebust4a201d62010-10-23 14:53:23 -0400294 struct nfs_cache_array_entry *cache_entry;
295 int ret;
296
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400297 if (IS_ERR(array))
298 return PTR_ERR(array);
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400299
Trond Myklebust4a201d62010-10-23 14:53:23 -0400300 cache_entry = &array->array[array->size];
Trond Myklebust30200932010-11-20 15:18:22 -0500301
302 /* Check that this entry lies within the page bounds */
303 ret = -ENOSPC;
304 if ((char *)&cache_entry[1] - (char *)page_address(page) > PAGE_SIZE)
305 goto out;
306
Trond Myklebust4a201d62010-10-23 14:53:23 -0400307 cache_entry->cookie = entry->prev_cookie;
308 cache_entry->ino = entry->ino;
Trond Myklebust0b26a0b2010-11-20 14:26:44 -0500309 cache_entry->d_type = entry->d_type;
Trond Myklebust4a201d62010-10-23 14:53:23 -0400310 ret = nfs_readdir_make_qstr(&cache_entry->string, entry->name, entry->len);
311 if (ret)
312 goto out;
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400313 array->last_cookie = entry->cookie;
Trond Myklebust8cd51a02010-11-15 20:26:22 -0500314 array->size++;
Trond Myklebust47c716c2010-12-07 12:44:56 -0500315 if (entry->eof != 0)
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400316 array->eof_index = array->size;
Trond Myklebust4a201d62010-10-23 14:53:23 -0400317out:
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400318 nfs_readdir_release_array(page);
Trond Myklebust4a201d62010-10-23 14:53:23 -0400319 return ret;
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400320}
321
322static
323int nfs_readdir_search_for_pos(struct nfs_cache_array *array, nfs_readdir_descriptor_t *desc)
324{
325 loff_t diff = desc->file->f_pos - desc->current_index;
326 unsigned int index;
327
328 if (diff < 0)
329 goto out_eof;
330 if (diff >= array->size) {
Trond Myklebust8cd51a02010-11-15 20:26:22 -0500331 if (array->eof_index >= 0)
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400332 goto out_eof;
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400333 return -EAGAIN;
334 }
335
336 index = (unsigned int)diff;
337 *desc->dir_cookie = array->array[index].cookie;
338 desc->cache_entry_index = index;
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400339 return 0;
340out_eof:
341 desc->eof = 1;
342 return -EBADCOOKIE;
343}
344
345static
346int nfs_readdir_search_for_cookie(struct nfs_cache_array *array, nfs_readdir_descriptor_t *desc)
347{
348 int i;
Bryan Schumaker8ef2ce32011-03-23 15:04:31 -0400349 loff_t new_pos;
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400350 int status = -EAGAIN;
351
352 for (i = 0; i < array->size; i++) {
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400353 if (array->array[i].cookie == *desc->dir_cookie) {
Trond Myklebust0c030802011-07-30 12:45:35 -0400354 struct nfs_inode *nfsi = NFS_I(desc->file->f_path.dentry->d_inode);
355 struct nfs_open_dir_context *ctx = desc->file->private_data;
356
Bryan Schumaker8ef2ce32011-03-23 15:04:31 -0400357 new_pos = desc->current_index + i;
Trond Myklebust0c030802011-07-30 12:45:35 -0400358 if (ctx->attr_gencount != nfsi->attr_gencount
359 || (nfsi->cache_validity & (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA))) {
360 ctx->duped = 0;
361 ctx->attr_gencount = nfsi->attr_gencount;
362 } else if (new_pos < desc->file->f_pos) {
363 if (ctx->duped > 0
364 && ctx->dup_cookie == *desc->dir_cookie) {
365 if (printk_ratelimit()) {
366 pr_notice("NFS: directory %s/%s contains a readdir loop."
367 "Please contact your server vendor. "
Bryan Schumaker374e4e32011-07-29 11:49:06 -0400368 "The file: %s has duplicate cookie %llu\n",
Trond Myklebust0c030802011-07-30 12:45:35 -0400369 desc->file->f_dentry->d_parent->d_name.name,
370 desc->file->f_dentry->d_name.name,
Bryan Schumaker374e4e32011-07-29 11:49:06 -0400371 array->array[i].string.name,
Trond Myklebust0c030802011-07-30 12:45:35 -0400372 *desc->dir_cookie);
373 }
374 status = -ELOOP;
375 goto out;
376 }
Bryan Schumaker8ef2ce32011-03-23 15:04:31 -0400377 ctx->dup_cookie = *desc->dir_cookie;
Trond Myklebust0c030802011-07-30 12:45:35 -0400378 ctx->duped = -1;
Bryan Schumaker8ef2ce32011-03-23 15:04:31 -0400379 }
380 desc->file->f_pos = new_pos;
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400381 desc->cache_entry_index = i;
Trond Myklebust47c716c2010-12-07 12:44:56 -0500382 return 0;
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400383 }
384 }
Trond Myklebust47c716c2010-12-07 12:44:56 -0500385 if (array->eof_index >= 0) {
Trond Myklebust8cd51a02010-11-15 20:26:22 -0500386 status = -EBADCOOKIE;
Trond Myklebust18fb5fe2010-12-07 12:41:58 -0500387 if (*desc->dir_cookie == array->last_cookie)
388 desc->eof = 1;
Trond Myklebust8cd51a02010-11-15 20:26:22 -0500389 }
Trond Myklebust0c030802011-07-30 12:45:35 -0400390out:
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400391 return status;
392}
393
394static
395int nfs_readdir_search_array(nfs_readdir_descriptor_t *desc)
396{
397 struct nfs_cache_array *array;
Trond Myklebust47c716c2010-12-07 12:44:56 -0500398 int status;
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400399
400 array = nfs_readdir_get_array(desc->page);
401 if (IS_ERR(array)) {
402 status = PTR_ERR(array);
403 goto out;
404 }
405
406 if (*desc->dir_cookie == 0)
407 status = nfs_readdir_search_for_pos(array, desc);
408 else
409 status = nfs_readdir_search_for_cookie(array, desc);
410
Trond Myklebust47c716c2010-12-07 12:44:56 -0500411 if (status == -EAGAIN) {
Trond Myklebust0aded702010-11-30 21:56:32 -0500412 desc->last_cookie = array->last_cookie;
Trond Myklebuste47c0852011-03-23 08:43:09 -0400413 desc->current_index += array->size;
Trond Myklebust47c716c2010-12-07 12:44:56 -0500414 desc->page_index++;
415 }
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400416 nfs_readdir_release_array(desc->page);
417out:
418 return status;
419}
420
421/* Fill a page with xdr information before transferring to the cache page */
422static
Bryan Schumaker56e4ebf2010-10-20 15:44:37 -0400423int nfs_readdir_xdr_filler(struct page **pages, nfs_readdir_descriptor_t *desc,
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400424 struct nfs_entry *entry, struct file *file, struct inode *inode)
425{
Bryan Schumaker480c2002011-03-23 14:48:29 -0400426 struct nfs_open_dir_context *ctx = file->private_data;
427 struct rpc_cred *cred = ctx->cred;
Trond Myklebust4704f0e2008-10-14 19:16:07 -0400428 unsigned long timestamp, gencount;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429 int error;
430
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431 again:
432 timestamp = jiffies;
Trond Myklebust4704f0e2008-10-14 19:16:07 -0400433 gencount = nfs_inc_attr_generation_counter();
Bryan Schumaker56e4ebf2010-10-20 15:44:37 -0400434 error = NFS_PROTO(inode)->readdir(file->f_path.dentry, cred, entry->cookie, pages,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435 NFS_SERVER(inode)->dtsize, desc->plus);
436 if (error < 0) {
437 /* We requested READDIRPLUS, but the server doesn't grok it */
438 if (error == -ENOTSUPP && desc->plus) {
439 NFS_SERVER(inode)->caps &= ~NFS_CAP_READDIRPLUS;
Benny Halevy3a10c302008-01-23 08:58:59 +0200440 clear_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(inode)->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441 desc->plus = 0;
442 goto again;
443 }
444 goto error;
445 }
Neil Brown1f4eab72007-04-16 09:35:27 +1000446 desc->timestamp = timestamp;
Trond Myklebust4704f0e2008-10-14 19:16:07 -0400447 desc->gencount = gencount;
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400448error:
449 return error;
450}
451
Chuck Lever573c4e12010-12-14 14:58:11 +0000452static int xdr_decode(nfs_readdir_descriptor_t *desc,
453 struct nfs_entry *entry, struct xdr_stream *xdr)
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400454{
Chuck Lever573c4e12010-12-14 14:58:11 +0000455 int error;
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400456
Chuck Lever573c4e12010-12-14 14:58:11 +0000457 error = desc->decode(xdr, entry, desc->plus);
458 if (error)
459 return error;
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400460 entry->fattr->time_start = desc->timestamp;
461 entry->fattr->gencount = desc->gencount;
462 return 0;
463}
464
Bryan Schumakerd39ab9d2010-09-24 18:50:01 -0400465static
466int nfs_same_file(struct dentry *dentry, struct nfs_entry *entry)
467{
Bryan Schumakerd39ab9d2010-09-24 18:50:01 -0400468 if (dentry->d_inode == NULL)
469 goto different;
Trond Myklebust37a09f02010-11-30 12:42:34 -0500470 if (nfs_compare_fh(entry->fh, NFS_FH(dentry->d_inode)) != 0)
Bryan Schumakerd39ab9d2010-09-24 18:50:01 -0400471 goto different;
472 return 1;
473different:
474 return 0;
475}
476
477static
478void nfs_prime_dcache(struct dentry *parent, struct nfs_entry *entry)
479{
Trond Myklebust4a201d62010-10-23 14:53:23 -0400480 struct qstr filename = {
481 .len = entry->len,
482 .name = entry->name,
483 };
484 struct dentry *dentry;
485 struct dentry *alias;
Bryan Schumakerd39ab9d2010-09-24 18:50:01 -0400486 struct inode *dir = parent->d_inode;
487 struct inode *inode;
488
Trond Myklebust4a201d62010-10-23 14:53:23 -0400489 if (filename.name[0] == '.') {
490 if (filename.len == 1)
491 return;
492 if (filename.len == 2 && filename.name[1] == '.')
493 return;
494 }
495 filename.hash = full_name_hash(filename.name, filename.len);
Bryan Schumakerd39ab9d2010-09-24 18:50:01 -0400496
Trond Myklebust4a201d62010-10-23 14:53:23 -0400497 dentry = d_lookup(parent, &filename);
Bryan Schumakerd39ab9d2010-09-24 18:50:01 -0400498 if (dentry != NULL) {
499 if (nfs_same_file(dentry, entry)) {
500 nfs_refresh_inode(dentry->d_inode, entry->fattr);
501 goto out;
502 } else {
503 d_drop(dentry);
504 dput(dentry);
505 }
506 }
507
508 dentry = d_alloc(parent, &filename);
Trond Myklebust4a201d62010-10-23 14:53:23 -0400509 if (dentry == NULL)
510 return;
511
Bryan Schumakerd39ab9d2010-09-24 18:50:01 -0400512 inode = nfs_fhget(dentry->d_sb, entry->fh, entry->fattr);
513 if (IS_ERR(inode))
514 goto out;
515
516 alias = d_materialise_unique(dentry, inode);
517 if (IS_ERR(alias))
518 goto out;
519 else if (alias) {
520 nfs_set_verifier(alias, nfs_save_change_attribute(dir));
521 dput(alias);
522 } else
523 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
524
525out:
526 dput(dentry);
Bryan Schumakerd39ab9d2010-09-24 18:50:01 -0400527}
528
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400529/* Perform conversion from xdr to cache array */
530static
Trond Myklebust8cd51a02010-11-15 20:26:22 -0500531int nfs_readdir_page_filler(nfs_readdir_descriptor_t *desc, struct nfs_entry *entry,
Trond Myklebust66502392011-01-08 17:45:38 -0500532 struct page **xdr_pages, struct page *page, unsigned int buflen)
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400533{
Bryan Schumakerbabddc72010-10-20 15:44:29 -0400534 struct xdr_stream stream;
Benny Halevyf7da7a12011-05-19 14:16:47 -0400535 struct xdr_buf buf;
Trond Myklebust66502392011-01-08 17:45:38 -0500536 struct page *scratch;
Bryan Schumaker99424382010-10-21 16:33:16 -0400537 struct nfs_cache_array *array;
Trond Myklebust5c346852010-11-20 12:43:45 -0500538 unsigned int count = 0;
539 int status;
Bryan Schumakerbabddc72010-10-20 15:44:29 -0400540
Trond Myklebust66502392011-01-08 17:45:38 -0500541 scratch = alloc_page(GFP_KERNEL);
542 if (scratch == NULL)
543 return -ENOMEM;
Bryan Schumakerbabddc72010-10-20 15:44:29 -0400544
Benny Halevyf7da7a12011-05-19 14:16:47 -0400545 xdr_init_decode_pages(&stream, &buf, xdr_pages, buflen);
Trond Myklebust66502392011-01-08 17:45:38 -0500546 xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE);
Bryan Schumaker99424382010-10-21 16:33:16 -0400547
548 do {
549 status = xdr_decode(desc, entry, &stream);
Trond Myklebust8cd51a02010-11-15 20:26:22 -0500550 if (status != 0) {
551 if (status == -EAGAIN)
552 status = 0;
Bryan Schumaker99424382010-10-21 16:33:16 -0400553 break;
Trond Myklebust8cd51a02010-11-15 20:26:22 -0500554 }
Bryan Schumaker99424382010-10-21 16:33:16 -0400555
Trond Myklebust5c346852010-11-20 12:43:45 -0500556 count++;
557
Trond Myklebust47c716c2010-12-07 12:44:56 -0500558 if (desc->plus != 0)
Bryan Schumakerd39ab9d2010-09-24 18:50:01 -0400559 nfs_prime_dcache(desc->file->f_path.dentry, entry);
Trond Myklebust8cd51a02010-11-15 20:26:22 -0500560
561 status = nfs_readdir_add_to_array(entry, page);
562 if (status != 0)
563 break;
Bryan Schumaker99424382010-10-21 16:33:16 -0400564 } while (!entry->eof);
565
Trond Myklebust47c716c2010-12-07 12:44:56 -0500566 if (count == 0 || (status == -EBADCOOKIE && entry->eof != 0)) {
Bryan Schumaker99424382010-10-21 16:33:16 -0400567 array = nfs_readdir_get_array(page);
Trond Myklebust8cd51a02010-11-15 20:26:22 -0500568 if (!IS_ERR(array)) {
569 array->eof_index = array->size;
570 status = 0;
571 nfs_readdir_release_array(page);
Trond Myklebust5c346852010-11-20 12:43:45 -0500572 } else
573 status = PTR_ERR(array);
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400574 }
Trond Myklebust66502392011-01-08 17:45:38 -0500575
576 put_page(scratch);
Trond Myklebust8cd51a02010-11-15 20:26:22 -0500577 return status;
Bryan Schumaker56e4ebf2010-10-20 15:44:37 -0400578}
579
580static
581void nfs_readdir_free_pagearray(struct page **pages, unsigned int npages)
582{
583 unsigned int i;
584 for (i = 0; i < npages; i++)
585 put_page(pages[i]);
586}
587
588static
589void nfs_readdir_free_large_page(void *ptr, struct page **pages,
590 unsigned int npages)
591{
Bryan Schumaker56e4ebf2010-10-20 15:44:37 -0400592 nfs_readdir_free_pagearray(pages, npages);
593}
594
595/*
596 * nfs_readdir_large_page will allocate pages that must be freed with a call
597 * to nfs_readdir_free_large_page
598 */
599static
Trond Myklebust66502392011-01-08 17:45:38 -0500600int nfs_readdir_large_page(struct page **pages, unsigned int npages)
Bryan Schumaker56e4ebf2010-10-20 15:44:37 -0400601{
Bryan Schumaker56e4ebf2010-10-20 15:44:37 -0400602 unsigned int i;
603
604 for (i = 0; i < npages; i++) {
605 struct page *page = alloc_page(GFP_KERNEL);
606 if (page == NULL)
607 goto out_freepages;
608 pages[i] = page;
609 }
Trond Myklebust66502392011-01-08 17:45:38 -0500610 return 0;
Bryan Schumaker56e4ebf2010-10-20 15:44:37 -0400611
Bryan Schumaker56e4ebf2010-10-20 15:44:37 -0400612out_freepages:
613 nfs_readdir_free_pagearray(pages, i);
Trond Myklebust66502392011-01-08 17:45:38 -0500614 return -ENOMEM;
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400615}
616
617static
618int nfs_readdir_xdr_to_array(nfs_readdir_descriptor_t *desc, struct page *page, struct inode *inode)
619{
Bryan Schumaker56e4ebf2010-10-20 15:44:37 -0400620 struct page *pages[NFS_MAX_READDIR_PAGES];
621 void *pages_ptr = NULL;
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400622 struct nfs_entry entry;
623 struct file *file = desc->file;
624 struct nfs_cache_array *array;
Trond Myklebust8cd51a02010-11-15 20:26:22 -0500625 int status = -ENOMEM;
Bryan Schumaker56e4ebf2010-10-20 15:44:37 -0400626 unsigned int array_size = ARRAY_SIZE(pages);
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400627
628 entry.prev_cookie = 0;
Trond Myklebust0aded702010-11-30 21:56:32 -0500629 entry.cookie = desc->last_cookie;
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400630 entry.eof = 0;
631 entry.fh = nfs_alloc_fhandle();
632 entry.fattr = nfs_alloc_fattr();
Chuck Lever573c4e12010-12-14 14:58:11 +0000633 entry.server = NFS_SERVER(inode);
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400634 if (entry.fh == NULL || entry.fattr == NULL)
635 goto out;
636
637 array = nfs_readdir_get_array(page);
Trond Myklebust8cd51a02010-11-15 20:26:22 -0500638 if (IS_ERR(array)) {
639 status = PTR_ERR(array);
640 goto out;
641 }
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400642 memset(array, 0, sizeof(struct nfs_cache_array));
643 array->eof_index = -1;
644
Trond Myklebust66502392011-01-08 17:45:38 -0500645 status = nfs_readdir_large_page(pages, array_size);
646 if (status < 0)
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400647 goto out_release_array;
648 do {
Trond Myklebustac396122010-11-15 20:26:22 -0500649 unsigned int pglen;
Bryan Schumaker56e4ebf2010-10-20 15:44:37 -0400650 status = nfs_readdir_xdr_filler(pages, desc, &entry, file, inode);
Bryan Schumakerbabddc72010-10-20 15:44:29 -0400651
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400652 if (status < 0)
653 break;
Trond Myklebustac396122010-11-15 20:26:22 -0500654 pglen = status;
Trond Myklebust66502392011-01-08 17:45:38 -0500655 status = nfs_readdir_page_filler(desc, &entry, pages, page, pglen);
Trond Myklebust8cd51a02010-11-15 20:26:22 -0500656 if (status < 0) {
657 if (status == -ENOSPC)
658 status = 0;
659 break;
660 }
661 } while (array->eof_index < 0);
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400662
Bryan Schumaker56e4ebf2010-10-20 15:44:37 -0400663 nfs_readdir_free_large_page(pages_ptr, pages, array_size);
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400664out_release_array:
665 nfs_readdir_release_array(page);
666out:
667 nfs_free_fattr(entry.fattr);
668 nfs_free_fhandle(entry.fh);
669 return status;
670}
671
672/*
673 * Now we cache directories properly, by converting xdr information
674 * to an array that can be used for lookups later. This results in
675 * fewer cache pages, since we can store more information on each page.
676 * We only need to convert from xdr once so future lookups are much simpler
677 */
678static
679int nfs_readdir_filler(nfs_readdir_descriptor_t *desc, struct page* page)
680{
681 struct inode *inode = desc->file->f_path.dentry->d_inode;
Trond Myklebust8cd51a02010-11-15 20:26:22 -0500682 int ret;
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400683
Trond Myklebust8cd51a02010-11-15 20:26:22 -0500684 ret = nfs_readdir_xdr_to_array(desc, page, inode);
685 if (ret < 0)
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400686 goto error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700687 SetPageUptodate(page);
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400688
Trond Myklebust2aac05a2008-07-07 13:26:10 -0400689 if (invalidate_inode_pages2_range(inode->i_mapping, page->index + 1, -1) < 0) {
Trond Myklebustcd9ae2b2006-10-19 23:28:40 -0700690 /* Should never happen */
691 nfs_zap_mapping(inode, inode->i_mapping);
692 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700693 unlock_page(page);
694 return 0;
695 error:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700696 unlock_page(page);
Trond Myklebust8cd51a02010-11-15 20:26:22 -0500697 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700698}
699
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400700static
701void cache_page_release(nfs_readdir_descriptor_t *desc)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700702{
Trond Myklebust11de3b12010-12-01 14:17:06 -0500703 if (!desc->page->mapping)
704 nfs_readdir_clear_array(desc->page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700705 page_cache_release(desc->page);
706 desc->page = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700707}
708
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400709static
710struct page *get_cache_page(nfs_readdir_descriptor_t *desc)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700711{
Trond Myklebust8cd51a02010-11-15 20:26:22 -0500712 return read_cache_page(desc->file->f_path.dentry->d_inode->i_mapping,
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400713 desc->page_index, (filler_t *)nfs_readdir_filler, desc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700714}
715
716/*
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400717 * Returns 0 if desc->dir_cookie was found on page desc->page_index
Olivier Galibert00a92642005-06-22 17:16:29 +0000718 */
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400719static
720int find_cache_page(nfs_readdir_descriptor_t *desc)
Olivier Galibert00a92642005-06-22 17:16:29 +0000721{
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400722 int res;
Olivier Galibert00a92642005-06-22 17:16:29 +0000723
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400724 desc->page = get_cache_page(desc);
725 if (IS_ERR(desc->page))
726 return PTR_ERR(desc->page);
Olivier Galibert00a92642005-06-22 17:16:29 +0000727
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400728 res = nfs_readdir_search_array(desc);
Trond Myklebust47c716c2010-12-07 12:44:56 -0500729 if (res != 0)
730 cache_page_release(desc);
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400731 return res;
Olivier Galibert00a92642005-06-22 17:16:29 +0000732}
733
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400734/* Search for desc->dir_cookie from the beginning of the page cache */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700735static inline
736int readdir_search_pagecache(nfs_readdir_descriptor_t *desc)
737{
Trond Myklebust8cd51a02010-11-15 20:26:22 -0500738 int res;
Olivier Galibert00a92642005-06-22 17:16:29 +0000739
Trond Myklebust0aded702010-11-30 21:56:32 -0500740 if (desc->page_index == 0) {
Trond Myklebust8cd51a02010-11-15 20:26:22 -0500741 desc->current_index = 0;
Trond Myklebust0aded702010-11-30 21:56:32 -0500742 desc->last_cookie = 0;
743 }
Trond Myklebust47c716c2010-12-07 12:44:56 -0500744 do {
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400745 res = find_cache_page(desc);
Trond Myklebust47c716c2010-12-07 12:44:56 -0500746 } while (res == -EAGAIN);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700747 return res;
748}
749
Linus Torvalds1da177e2005-04-16 15:20:36 -0700750/*
751 * Once we've found the start of the dirent within a page: fill 'er up...
752 */
753static
754int nfs_do_filldir(nfs_readdir_descriptor_t *desc, void *dirent,
755 filldir_t filldir)
756{
757 struct file *file = desc->file;
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400758 int i = 0;
759 int res = 0;
760 struct nfs_cache_array *array = NULL;
Bryan Schumaker8ef2ce32011-03-23 15:04:31 -0400761 struct nfs_open_dir_context *ctx = file->private_data;
762
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400763 array = nfs_readdir_get_array(desc->page);
Trond Myklebuste7c58e92010-11-20 13:22:24 -0500764 if (IS_ERR(array)) {
765 res = PTR_ERR(array);
766 goto out;
767 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700768
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400769 for (i = desc->cache_entry_index; i < array->size; i++) {
Trond Myklebustece0b422010-11-20 13:55:33 -0500770 struct nfs_cache_array_entry *ent;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700771
Trond Myklebustece0b422010-11-20 13:55:33 -0500772 ent = &array->array[i];
773 if (filldir(dirent, ent->string.name, ent->string.len,
Trond Myklebust0b26a0b2010-11-20 14:26:44 -0500774 file->f_pos, nfs_compat_user_ino64(ent->ino),
775 ent->d_type) < 0) {
Trond Myklebustece0b422010-11-20 13:55:33 -0500776 desc->eof = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700777 break;
Trond Myklebustece0b422010-11-20 13:55:33 -0500778 }
Olivier Galibert00a92642005-06-22 17:16:29 +0000779 file->f_pos++;
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400780 if (i < (array->size-1))
781 *desc->dir_cookie = array->array[i+1].cookie;
782 else
783 *desc->dir_cookie = array->last_cookie;
Trond Myklebust0c030802011-07-30 12:45:35 -0400784 if (ctx->duped != 0)
785 ctx->duped = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700786 }
Trond Myklebust47c716c2010-12-07 12:44:56 -0500787 if (array->eof_index >= 0)
Trond Myklebust8cd51a02010-11-15 20:26:22 -0500788 desc->eof = 1;
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400789
790 nfs_readdir_release_array(desc->page);
Trond Myklebuste7c58e92010-11-20 13:22:24 -0500791out:
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400792 cache_page_release(desc);
Chuck Lever1e7cb3d2006-03-20 13:44:24 -0500793 dfprintk(DIRCACHE, "NFS: nfs_do_filldir() filling ended @ cookie %Lu; returning = %d\n",
794 (unsigned long long)*desc->dir_cookie, res);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700795 return res;
796}
797
798/*
799 * If we cannot find a cookie in our cache, we suspect that this is
800 * because it points to a deleted file, so we ask the server to return
801 * whatever it thinks is the next entry. We then feed this to filldir.
802 * If all goes well, we should then be able to find our way round the
803 * cache on the next call to readdir_search_pagecache();
804 *
805 * NOTE: we cannot add the anonymous page to the pagecache because
806 * the data it contains might not be page aligned. Besides,
807 * we should already have a complete representation of the
808 * directory in the page cache by the time we get here.
809 */
810static inline
811int uncached_readdir(nfs_readdir_descriptor_t *desc, void *dirent,
812 filldir_t filldir)
813{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700814 struct page *page = NULL;
815 int status;
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400816 struct inode *inode = desc->file->f_path.dentry->d_inode;
Trond Myklebust0c030802011-07-30 12:45:35 -0400817 struct nfs_open_dir_context *ctx = desc->file->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700818
Chuck Lever1e7cb3d2006-03-20 13:44:24 -0500819 dfprintk(DIRCACHE, "NFS: uncached_readdir() searching for cookie %Lu\n",
820 (unsigned long long)*desc->dir_cookie);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700821
822 page = alloc_page(GFP_HIGHUSER);
823 if (!page) {
824 status = -ENOMEM;
825 goto out;
826 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700827
Trond Myklebust7a8e1dc2010-11-20 13:24:46 -0500828 desc->page_index = 0;
Trond Myklebust0aded702010-11-30 21:56:32 -0500829 desc->last_cookie = *desc->dir_cookie;
Trond Myklebust7a8e1dc2010-11-20 13:24:46 -0500830 desc->page = page;
Trond Myklebust0c030802011-07-30 12:45:35 -0400831 ctx->duped = 0;
Trond Myklebust7a8e1dc2010-11-20 13:24:46 -0500832
Trond Myklebust85f86072010-11-20 13:24:49 -0500833 status = nfs_readdir_xdr_to_array(desc, page, inode);
834 if (status < 0)
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400835 goto out_release;
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400836
Linus Torvalds1da177e2005-04-16 15:20:36 -0700837 status = nfs_do_filldir(desc, dirent, filldir);
838
Linus Torvalds1da177e2005-04-16 15:20:36 -0700839 out:
Chuck Lever1e7cb3d2006-03-20 13:44:24 -0500840 dfprintk(DIRCACHE, "NFS: %s: returns %d\n",
Harvey Harrison3110ff82008-05-02 13:42:44 -0700841 __func__, status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700842 return status;
843 out_release:
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400844 cache_page_release(desc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700845 goto out;
846}
847
Olivier Galibert00a92642005-06-22 17:16:29 +0000848/* The file offset position represents the dirent entry number. A
849 last cookie cache takes care of the common case of reading the
850 whole directory.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700851 */
852static int nfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
853{
Josef "Jeff" Sipek01cce932006-12-08 02:36:40 -0800854 struct dentry *dentry = filp->f_path.dentry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700855 struct inode *inode = dentry->d_inode;
856 nfs_readdir_descriptor_t my_desc,
857 *desc = &my_desc;
Bryan Schumaker480c2002011-03-23 14:48:29 -0400858 struct nfs_open_dir_context *dir_ctx = filp->private_data;
Trond Myklebust47c716c2010-12-07 12:44:56 -0500859 int res;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700860
Chuck Lever6da24bc2008-06-11 17:55:58 -0400861 dfprintk(FILE, "NFS: readdir(%s/%s) starting at cookie %llu\n",
Chuck Lever1e7cb3d2006-03-20 13:44:24 -0500862 dentry->d_parent->d_name.name, dentry->d_name.name,
863 (long long)filp->f_pos);
Chuck Lever91d5b472006-03-20 13:44:14 -0500864 nfs_inc_stats(inode, NFSIOS_VFSGETDENTS);
865
Linus Torvalds1da177e2005-04-16 15:20:36 -0700866 /*
Olivier Galibert00a92642005-06-22 17:16:29 +0000867 * filp->f_pos points to the dirent entry number.
Trond Myklebustf0dd2132005-06-22 17:16:29 +0000868 * *desc->dir_cookie has the cookie for the next entry. We have
Olivier Galibert00a92642005-06-22 17:16:29 +0000869 * to either find the entry with the appropriate number or
870 * revalidate the cookie.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700871 */
872 memset(desc, 0, sizeof(*desc));
873
874 desc->file = filp;
Bryan Schumaker480c2002011-03-23 14:48:29 -0400875 desc->dir_cookie = &dir_ctx->dir_cookie;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700876 desc->decode = NFS_PROTO(inode)->decode_dirent;
877 desc->plus = NFS_USE_READDIRPLUS(inode);
878
Trond Myklebust565277f2007-10-15 18:17:53 -0400879 nfs_block_sillyrename(dentry);
Trond Myklebust1cda7072010-02-19 17:03:30 -0800880 res = nfs_revalidate_mapping(inode, filp->f_mapping);
Trond Myklebustfccca7f2008-01-26 17:37:47 -0500881 if (res < 0)
882 goto out;
883
Trond Myklebust47c716c2010-12-07 12:44:56 -0500884 do {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700885 res = readdir_search_pagecache(desc);
Olivier Galibert00a92642005-06-22 17:16:29 +0000886
Linus Torvalds1da177e2005-04-16 15:20:36 -0700887 if (res == -EBADCOOKIE) {
Trond Myklebustece0b422010-11-20 13:55:33 -0500888 res = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700889 /* This means either end of directory */
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400890 if (*desc->dir_cookie && desc->eof == 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700891 /* Or that the server has 'lost' a cookie */
892 res = uncached_readdir(desc, dirent, filldir);
Trond Myklebustece0b422010-11-20 13:55:33 -0500893 if (res == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700894 continue;
895 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700896 break;
897 }
898 if (res == -ETOOSMALL && desc->plus) {
Benny Halevy3a10c302008-01-23 08:58:59 +0200899 clear_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(inode)->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700900 nfs_zap_caches(inode);
Trond Myklebustbaf57a02010-09-24 18:49:43 -0400901 desc->page_index = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700902 desc->plus = 0;
Bryan Schumakerd1bacf92010-09-24 14:48:42 -0400903 desc->eof = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700904 continue;
905 }
906 if (res < 0)
907 break;
908
909 res = nfs_do_filldir(desc, dirent, filldir);
Trond Myklebustece0b422010-11-20 13:55:33 -0500910 if (res < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700911 break;
Trond Myklebust47c716c2010-12-07 12:44:56 -0500912 } while (!desc->eof);
Trond Myklebustfccca7f2008-01-26 17:37:47 -0500913out:
Trond Myklebust565277f2007-10-15 18:17:53 -0400914 nfs_unblock_sillyrename(dentry);
Chuck Lever1e7cb3d2006-03-20 13:44:24 -0500915 if (res > 0)
916 res = 0;
Trond Myklebustaa49b4c2010-04-16 16:22:49 -0400917 dfprintk(FILE, "NFS: readdir(%s/%s) returns %d\n",
Chuck Lever1e7cb3d2006-03-20 13:44:24 -0500918 dentry->d_parent->d_name.name, dentry->d_name.name,
919 res);
920 return res;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700921}
922
Trond Myklebust10afec92007-05-14 17:16:04 -0400923static loff_t nfs_llseek_dir(struct file *filp, loff_t offset, int origin)
Trond Myklebustf0dd2132005-06-22 17:16:29 +0000924{
Chuck Leverb84e06c2008-06-11 17:55:34 -0400925 struct dentry *dentry = filp->f_path.dentry;
926 struct inode *inode = dentry->d_inode;
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
Chuck Lever6da24bc2008-06-11 17:55:58 -0400929 dfprintk(FILE, "NFS: llseek dir(%s/%s, %lld, %d)\n",
Chuck Leverb84e06c2008-06-11 17:55:34 -0400930 dentry->d_parent->d_name.name,
931 dentry->d_name.name,
932 offset, origin);
933
934 mutex_lock(&inode->i_mutex);
Trond Myklebustf0dd2132005-06-22 17:16:29 +0000935 switch (origin) {
936 case 1:
937 offset += filp->f_pos;
938 case 0:
939 if (offset >= 0)
940 break;
941 default:
942 offset = -EINVAL;
943 goto out;
944 }
945 if (offset != filp->f_pos) {
946 filp->f_pos = offset;
Bryan Schumaker480c2002011-03-23 14:48:29 -0400947 dir_ctx->dir_cookie = 0;
Bryan Schumaker8ef2ce32011-03-23 15:04:31 -0400948 dir_ctx->duped = 0;
Trond Myklebustf0dd2132005-06-22 17:16:29 +0000949 }
950out:
Chuck Leverb84e06c2008-06-11 17:55:34 -0400951 mutex_unlock(&inode->i_mutex);
Trond Myklebustf0dd2132005-06-22 17:16:29 +0000952 return offset;
953}
954
Linus Torvalds1da177e2005-04-16 15:20:36 -0700955/*
956 * All directory operations under NFS are synchronous, so fsync()
957 * is a dummy operation.
958 */
Josef Bacik02c24a82011-07-16 20:44:56 -0400959static int nfs_fsync_dir(struct file *filp, loff_t start, loff_t end,
960 int datasync)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700961{
Christoph Hellwig7ea80852010-05-26 17:53:25 +0200962 struct dentry *dentry = filp->f_path.dentry;
Josef Bacik02c24a82011-07-16 20:44:56 -0400963 struct inode *inode = dentry->d_inode;
Christoph Hellwig7ea80852010-05-26 17:53:25 +0200964
Chuck Lever6da24bc2008-06-11 17:55:58 -0400965 dfprintk(FILE, "NFS: fsync dir(%s/%s) datasync %d\n",
Chuck Lever1e7cb3d2006-03-20 13:44:24 -0500966 dentry->d_parent->d_name.name, dentry->d_name.name,
967 datasync);
968
Josef Bacik02c24a82011-07-16 20:44:56 -0400969 mutex_lock(&inode->i_mutex);
Chuck Lever54917782008-05-27 16:29:07 -0400970 nfs_inc_stats(dentry->d_inode, NFSIOS_VFSFSYNC);
Josef Bacik02c24a82011-07-16 20:44:56 -0400971 mutex_unlock(&inode->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700972 return 0;
973}
974
Trond Myklebustbfc69a42007-10-15 18:18:29 -0400975/**
976 * nfs_force_lookup_revalidate - Mark the directory as having changed
977 * @dir - pointer to directory inode
978 *
979 * This forces the revalidation code in nfs_lookup_revalidate() to do a
980 * full lookup on all child dentries of 'dir' whenever a change occurs
981 * on the server that might have invalidated our dcache.
982 *
983 * The caller should be holding dir->i_lock
984 */
985void nfs_force_lookup_revalidate(struct inode *dir)
986{
Trond Myklebust011935a02008-10-14 19:24:50 -0400987 NFS_I(dir)->cache_change_attribute++;
Trond Myklebustbfc69a42007-10-15 18:18:29 -0400988}
989
Linus Torvalds1da177e2005-04-16 15:20:36 -0700990/*
991 * A check for whether or not the parent directory has changed.
992 * In the case it has, we assume that the dentries are untrustworthy
993 * and may need to be looked up again.
994 */
Trond Myklebustc79ba782007-01-31 08:16:24 -0500995static int nfs_check_verifier(struct inode *dir, struct dentry *dentry)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700996{
997 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 */
1004 if (nfs_revalidate_inode(NFS_SERVER(dir), dir) < 0)
1005 return 0;
1006 if (!nfs_verify_change_attribute(dir, dentry->d_time))
1007 return 0;
1008 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001009}
1010
Linus Torvalds1da177e2005-04-16 15:20:36 -07001011/*
Trond Myklebust1d6757f2005-06-07 18:37:01 -04001012 * Return the intent data that applies to this particular path component
1013 *
1014 * Note that the current set of intents only apply to the very last
Al Viro8aeb3762011-06-25 21:48:43 -04001015 * component of the path and none of them is set before that last
1016 * component.
Trond Myklebust1d6757f2005-06-07 18:37:01 -04001017 */
Nick Piggin34286d62011-01-07 17:49:57 +11001018static inline unsigned int nfs_lookup_check_intent(struct nameidata *nd,
1019 unsigned int mask)
Trond Myklebust1d6757f2005-06-07 18:37:01 -04001020{
Trond Myklebust1d6757f2005-06-07 18:37:01 -04001021 return nd->flags & mask;
1022}
1023
1024/*
Trond Myklebusta12802c2007-10-02 19:13:04 -04001025 * Use intent information to check whether or not we're going to do
1026 * an O_EXCL create using this path component.
1027 */
1028static int nfs_is_exclusive_create(struct inode *dir, struct nameidata *nd)
1029{
1030 if (NFS_PROTO(dir)->version == 2)
1031 return 0;
Al Viro35165862008-08-05 03:00:49 -04001032 return nd && nfs_lookup_check_intent(nd, LOOKUP_EXCL);
Trond Myklebusta12802c2007-10-02 19:13:04 -04001033}
1034
1035/*
Trond Myklebust1d6757f2005-06-07 18:37:01 -04001036 * Inode and filehandle revalidation for lookups.
1037 *
1038 * We force revalidation in the cases where the VFS sets LOOKUP_REVAL,
1039 * or if the intent information indicates that we're about to open this
1040 * particular file and the "nocto" mount flag is not set.
1041 *
1042 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001043static inline
1044int nfs_lookup_verify_inode(struct inode *inode, struct nameidata *nd)
1045{
1046 struct nfs_server *server = NFS_SERVER(inode);
1047
David Howells36d43a42011-01-14 18:45:42 +00001048 if (IS_AUTOMOUNT(inode))
Trond Myklebust4e99a1f2008-03-06 12:34:59 -05001049 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001050 if (nd != NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001051 /* VFS wants an on-the-wire revalidation */
Trond Myklebust1d6757f2005-06-07 18:37:01 -04001052 if (nd->flags & LOOKUP_REVAL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001053 goto out_force;
1054 /* This is an open(2) */
Trond Myklebust1d6757f2005-06-07 18:37:01 -04001055 if (nfs_lookup_check_intent(nd, LOOKUP_OPEN) != 0 &&
Trond Myklebust4e0641a2006-07-05 13:05:13 -04001056 !(server->flags & NFS_MOUNT_NOCTO) &&
1057 (S_ISREG(inode->i_mode) ||
1058 S_ISDIR(inode->i_mode)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001059 goto out_force;
Trond Myklebust4f48af42007-10-02 23:13:32 -04001060 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001061 }
1062 return nfs_revalidate_inode(server, inode);
1063out_force:
1064 return __nfs_revalidate_inode(server, inode);
1065}
1066
1067/*
1068 * We judge how long we want to trust negative
1069 * dentries by looking at the parent inode mtime.
1070 *
1071 * If parent mtime has changed, we revalidate, else we wait for a
1072 * period corresponding to the parent's attribute cache timeout value.
1073 */
1074static inline
1075int nfs_neg_need_reval(struct inode *dir, struct dentry *dentry,
1076 struct nameidata *nd)
1077{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001078 /* Don't revalidate a negative dentry if we're creating a new file */
Trond Myklebust1d6757f2005-06-07 18:37:01 -04001079 if (nd != NULL && nfs_lookup_check_intent(nd, LOOKUP_CREATE) != 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001080 return 0;
Trond Myklebust4eec9522008-07-15 17:58:13 -04001081 if (NFS_SERVER(dir)->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG)
1082 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001083 return !nfs_check_verifier(dir, dentry);
1084}
1085
1086/*
1087 * This is called every time the dcache has a lookup hit,
1088 * and we should check whether we can really trust that
1089 * lookup.
1090 *
1091 * NOTE! The hit can be a negative hit too, don't assume
1092 * we have an inode!
1093 *
1094 * If the parent directory is seen to have changed, we throw out the
1095 * cached dentry and do a new lookup.
1096 */
Nick Piggin34286d62011-01-07 17:49:57 +11001097static int nfs_lookup_revalidate(struct dentry *dentry, struct nameidata *nd)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001098{
1099 struct inode *dir;
1100 struct inode *inode;
1101 struct dentry *parent;
Trond Myklebuste1fb4d02010-04-16 16:22:47 -04001102 struct nfs_fh *fhandle = NULL;
1103 struct nfs_fattr *fattr = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001104 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001105
Nick Piggin34286d62011-01-07 17:49:57 +11001106 if (nd->flags & LOOKUP_RCU)
1107 return -ECHILD;
1108
Linus Torvalds1da177e2005-04-16 15:20:36 -07001109 parent = dget_parent(dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001110 dir = parent->d_inode;
Chuck Lever91d5b472006-03-20 13:44:14 -05001111 nfs_inc_stats(dir, NFSIOS_DENTRYREVALIDATE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001112 inode = dentry->d_inode;
1113
1114 if (!inode) {
1115 if (nfs_neg_need_reval(dir, dentry, nd))
1116 goto out_bad;
1117 goto out_valid;
1118 }
1119
1120 if (is_bad_inode(inode)) {
Chuck Lever1e7cb3d2006-03-20 13:44:24 -05001121 dfprintk(LOOKUPCACHE, "%s: %s/%s has dud inode\n",
Harvey Harrison3110ff82008-05-02 13:42:44 -07001122 __func__, dentry->d_parent->d_name.name,
Chuck Lever1e7cb3d2006-03-20 13:44:24 -05001123 dentry->d_name.name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001124 goto out_bad;
1125 }
1126
Trond Myklebust15860ab2008-12-23 15:21:54 -05001127 if (nfs_have_delegation(inode, FMODE_READ))
1128 goto out_set_verifier;
1129
Linus Torvalds1da177e2005-04-16 15:20:36 -07001130 /* Force a full look up iff the parent directory has changed */
Trond Myklebusta12802c2007-10-02 19:13:04 -04001131 if (!nfs_is_exclusive_create(dir, nd) && nfs_check_verifier(dir, dentry)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001132 if (nfs_lookup_verify_inode(inode, nd))
1133 goto out_zap_parent;
1134 goto out_valid;
1135 }
1136
1137 if (NFS_STALE(inode))
1138 goto out_bad;
1139
Trond Myklebuste1fb4d02010-04-16 16:22:47 -04001140 error = -ENOMEM;
1141 fhandle = nfs_alloc_fhandle();
1142 fattr = nfs_alloc_fattr();
1143 if (fhandle == NULL || fattr == NULL)
1144 goto out_error;
1145
Bryan Schumaker7c513052011-03-24 17:12:24 +00001146 error = NFS_PROTO(dir)->lookup(NFS_SERVER(dir)->client, dir, &dentry->d_name, fhandle, fattr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001147 if (error)
1148 goto out_bad;
Trond Myklebuste1fb4d02010-04-16 16:22:47 -04001149 if (nfs_compare_fh(NFS_FH(inode), fhandle))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001150 goto out_bad;
Trond Myklebuste1fb4d02010-04-16 16:22:47 -04001151 if ((error = nfs_refresh_inode(inode, fattr)) != 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001152 goto out_bad;
1153
Trond Myklebuste1fb4d02010-04-16 16:22:47 -04001154 nfs_free_fattr(fattr);
1155 nfs_free_fhandle(fhandle);
Trond Myklebust15860ab2008-12-23 15:21:54 -05001156out_set_verifier:
Trond Myklebustcf8ba452007-10-01 13:46:53 -04001157 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001158 out_valid:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001159 dput(parent);
Chuck Lever1e7cb3d2006-03-20 13:44:24 -05001160 dfprintk(LOOKUPCACHE, "NFS: %s(%s/%s) is valid\n",
Harvey Harrison3110ff82008-05-02 13:42:44 -07001161 __func__, dentry->d_parent->d_name.name,
Chuck Lever1e7cb3d2006-03-20 13:44:24 -05001162 dentry->d_name.name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001163 return 1;
1164out_zap_parent:
1165 nfs_zap_caches(dir);
1166 out_bad:
Trond Myklebusta1643a92007-09-29 17:25:43 -04001167 nfs_mark_for_revalidate(dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001168 if (inode && S_ISDIR(inode->i_mode)) {
1169 /* Purge readdir caches. */
1170 nfs_zap_caches(inode);
1171 /* If we have submounts, don't unhash ! */
1172 if (have_submounts(dentry))
1173 goto out_valid;
Al Virod9e80b72010-04-29 03:10:43 +01001174 if (dentry->d_flags & DCACHE_DISCONNECTED)
1175 goto out_valid;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001176 shrink_dcache_parent(dentry);
1177 }
1178 d_drop(dentry);
Trond Myklebuste1fb4d02010-04-16 16:22:47 -04001179 nfs_free_fattr(fattr);
1180 nfs_free_fhandle(fhandle);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001181 dput(parent);
Chuck Lever1e7cb3d2006-03-20 13:44:24 -05001182 dfprintk(LOOKUPCACHE, "NFS: %s(%s/%s) is invalid\n",
Harvey Harrison3110ff82008-05-02 13:42:44 -07001183 __func__, dentry->d_parent->d_name.name,
Chuck Lever1e7cb3d2006-03-20 13:44:24 -05001184 dentry->d_name.name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001185 return 0;
Trond Myklebuste1fb4d02010-04-16 16:22:47 -04001186out_error:
1187 nfs_free_fattr(fattr);
1188 nfs_free_fhandle(fhandle);
1189 dput(parent);
1190 dfprintk(LOOKUPCACHE, "NFS: %s(%s/%s) lookup returned error %d\n",
1191 __func__, dentry->d_parent->d_name.name,
1192 dentry->d_name.name, error);
1193 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001194}
1195
1196/*
1197 * This is called from dput() when d_count is going to 0.
1198 */
Nick Pigginfe15ce42011-01-07 17:49:23 +11001199static int nfs_dentry_delete(const struct dentry *dentry)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001200{
1201 dfprintk(VFS, "NFS: dentry_delete(%s/%s, %x)\n",
1202 dentry->d_parent->d_name.name, dentry->d_name.name,
1203 dentry->d_flags);
1204
Trond Myklebust77f11192008-01-28 19:43:19 -05001205 /* Unhash any dentry with a stale inode */
1206 if (dentry->d_inode != NULL && NFS_STALE(dentry->d_inode))
1207 return 1;
1208
Linus Torvalds1da177e2005-04-16 15:20:36 -07001209 if (dentry->d_flags & DCACHE_NFSFS_RENAMED) {
1210 /* Unhash it, so that ->d_iput() would be called */
1211 return 1;
1212 }
1213 if (!(dentry->d_sb->s_flags & MS_ACTIVE)) {
1214 /* Unhash it, so that ancestors of killed async unlink
1215 * files will be cleaned up during umount */
1216 return 1;
1217 }
1218 return 0;
1219
1220}
1221
Trond Myklebust1b83d702008-06-11 15:44:04 -04001222static void nfs_drop_nlink(struct inode *inode)
1223{
1224 spin_lock(&inode->i_lock);
1225 if (inode->i_nlink > 0)
1226 drop_nlink(inode);
1227 spin_unlock(&inode->i_lock);
1228}
1229
Linus Torvalds1da177e2005-04-16 15:20:36 -07001230/*
1231 * Called when the dentry loses inode.
1232 * We use it to clean up silly-renamed files.
1233 */
1234static void nfs_dentry_iput(struct dentry *dentry, struct inode *inode)
1235{
Neil Brown83672d32007-02-26 12:48:25 +11001236 if (S_ISDIR(inode->i_mode))
1237 /* drop any readdir cache as it could easily be old */
1238 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_DATA;
1239
Linus Torvalds1da177e2005-04-16 15:20:36 -07001240 if (dentry->d_flags & DCACHE_NFSFS_RENAMED) {
Dave Hansen9a53c3a2006-09-30 23:29:03 -07001241 drop_nlink(inode);
Trond Myklebuste4eff1a2007-07-14 15:39:58 -04001242 nfs_complete_unlink(dentry, inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001243 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001244 iput(inode);
1245}
1246
Al Virob1942c52011-03-16 05:44:14 -04001247static void nfs_d_release(struct dentry *dentry)
1248{
1249 /* free cached devname value, if it survived that far */
1250 if (unlikely(dentry->d_fsdata)) {
1251 if (dentry->d_flags & DCACHE_NFSFS_RENAMED)
1252 WARN_ON(1);
1253 else
1254 kfree(dentry->d_fsdata);
1255 }
1256}
1257
Al Virof786aa92009-02-20 05:51:22 +00001258const struct dentry_operations nfs_dentry_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001259 .d_revalidate = nfs_lookup_revalidate,
1260 .d_delete = nfs_dentry_delete,
1261 .d_iput = nfs_dentry_iput,
David Howells36d43a42011-01-14 18:45:42 +00001262 .d_automount = nfs_d_automount,
Al Virob1942c52011-03-16 05:44:14 -04001263 .d_release = nfs_d_release,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001264};
1265
Linus Torvalds1da177e2005-04-16 15:20:36 -07001266static struct dentry *nfs_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd)
1267{
1268 struct dentry *res;
Trond Myklebust565277f2007-10-15 18:17:53 -04001269 struct dentry *parent;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001270 struct inode *inode = NULL;
Trond Myklebuste1fb4d02010-04-16 16:22:47 -04001271 struct nfs_fh *fhandle = NULL;
1272 struct nfs_fattr *fattr = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001273 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001274
1275 dfprintk(VFS, "NFS: lookup(%s/%s)\n",
1276 dentry->d_parent->d_name.name, dentry->d_name.name);
Chuck Lever91d5b472006-03-20 13:44:14 -05001277 nfs_inc_stats(dir, NFSIOS_VFSLOOKUP);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001278
1279 res = ERR_PTR(-ENAMETOOLONG);
1280 if (dentry->d_name.len > NFS_SERVER(dir)->namelen)
1281 goto out;
1282
Trond Myklebustfd684072006-09-05 12:27:44 -04001283 /*
1284 * If we're doing an exclusive create, optimize away the lookup
1285 * but don't hash the dentry.
1286 */
1287 if (nfs_is_exclusive_create(dir, nd)) {
1288 d_instantiate(dentry, NULL);
1289 res = NULL;
Trond Myklebustfc0f6842008-06-11 15:44:20 -04001290 goto out;
Trond Myklebustfd684072006-09-05 12:27:44 -04001291 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001292
Trond Myklebuste1fb4d02010-04-16 16:22:47 -04001293 res = ERR_PTR(-ENOMEM);
1294 fhandle = nfs_alloc_fhandle();
1295 fattr = nfs_alloc_fattr();
1296 if (fhandle == NULL || fattr == NULL)
1297 goto out;
1298
Trond Myklebust565277f2007-10-15 18:17:53 -04001299 parent = dentry->d_parent;
1300 /* Protect against concurrent sillydeletes */
1301 nfs_block_sillyrename(parent);
Bryan Schumaker7c513052011-03-24 17:12:24 +00001302 error = NFS_PROTO(dir)->lookup(NFS_SERVER(dir)->client, dir, &dentry->d_name, fhandle, fattr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001303 if (error == -ENOENT)
1304 goto no_entry;
1305 if (error < 0) {
1306 res = ERR_PTR(error);
Trond Myklebust565277f2007-10-15 18:17:53 -04001307 goto out_unblock_sillyrename;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001308 }
Trond Myklebuste1fb4d02010-04-16 16:22:47 -04001309 inode = nfs_fhget(dentry->d_sb, fhandle, fattr);
Namhyung Kimbf0c84f2010-12-28 17:02:46 +00001310 res = ERR_CAST(inode);
Trond Myklebust03f28e32006-03-20 13:44:48 -05001311 if (IS_ERR(res))
Trond Myklebust565277f2007-10-15 18:17:53 -04001312 goto out_unblock_sillyrename;
David Howells54ceac42006-08-22 20:06:13 -04001313
Linus Torvalds1da177e2005-04-16 15:20:36 -07001314no_entry:
David Howells54ceac42006-08-22 20:06:13 -04001315 res = d_materialise_unique(dentry, inode);
Trond Myklebust9eaef272006-10-21 10:24:20 -07001316 if (res != NULL) {
1317 if (IS_ERR(res))
Trond Myklebust565277f2007-10-15 18:17:53 -04001318 goto out_unblock_sillyrename;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001319 dentry = res;
Trond Myklebust9eaef272006-10-21 10:24:20 -07001320 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001321 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
Trond Myklebust565277f2007-10-15 18:17:53 -04001322out_unblock_sillyrename:
1323 nfs_unblock_sillyrename(parent);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001324out:
Trond Myklebuste1fb4d02010-04-16 16:22:47 -04001325 nfs_free_fattr(fattr);
1326 nfs_free_fhandle(fhandle);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001327 return res;
1328}
1329
1330#ifdef CONFIG_NFS_V4
1331static int nfs_open_revalidate(struct dentry *, struct nameidata *);
1332
Al Virof786aa92009-02-20 05:51:22 +00001333const struct dentry_operations nfs4_dentry_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001334 .d_revalidate = nfs_open_revalidate,
1335 .d_delete = nfs_dentry_delete,
1336 .d_iput = nfs_dentry_iput,
David Howells36d43a42011-01-14 18:45:42 +00001337 .d_automount = nfs_d_automount,
Al Virob1942c52011-03-16 05:44:14 -04001338 .d_release = nfs_d_release,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001339};
1340
Trond Myklebust1d6757f2005-06-07 18:37:01 -04001341/*
1342 * Use intent information to determine whether we need to substitute
1343 * the NFSv4-style stateful OPEN for the LOOKUP call
1344 */
Trond Myklebust5584c302008-12-23 15:21:54 -05001345static int is_atomic_open(struct nameidata *nd)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001346{
Trond Myklebust1d6757f2005-06-07 18:37:01 -04001347 if (nd == NULL || nfs_lookup_check_intent(nd, LOOKUP_OPEN) == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001348 return 0;
1349 /* NFS does not (yet) have a stateful open for directories */
1350 if (nd->flags & LOOKUP_DIRECTORY)
1351 return 0;
1352 /* Are we trying to write to a read only partition? */
Dave Hansen2c463e92008-02-15 14:37:56 -08001353 if (__mnt_is_readonly(nd->path.mnt) &&
Al Viro8a5e9292011-06-25 19:15:54 -04001354 (nd->intent.open.flags & (O_CREAT|O_TRUNC|O_ACCMODE)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001355 return 0;
1356 return 1;
1357}
1358
Al Viro8a5e9292011-06-25 19:15:54 -04001359static fmode_t flags_to_mode(int flags)
1360{
1361 fmode_t res = (__force fmode_t)flags & FMODE_EXEC;
1362 if ((flags & O_ACCMODE) != O_WRONLY)
1363 res |= FMODE_READ;
1364 if ((flags & O_ACCMODE) != O_RDONLY)
1365 res |= FMODE_WRITE;
1366 return res;
1367}
1368
Al Viro51141592011-06-22 18:47:28 -04001369static struct nfs_open_context *create_nfs_open_context(struct dentry *dentry, int open_flags)
Trond Myklebustcd9a1c02010-09-17 10:56:50 -04001370{
Al Viro5ede7b12011-10-23 18:49:54 -04001371 return alloc_nfs_open_context(dentry, flags_to_mode(open_flags));
Trond Myklebustcd9a1c02010-09-17 10:56:50 -04001372}
1373
1374static int do_open(struct inode *inode, struct file *filp)
1375{
1376 nfs_fscache_set_inode_cookie(inode, filp);
1377 return 0;
1378}
1379
1380static int nfs_intent_set_file(struct nameidata *nd, struct nfs_open_context *ctx)
1381{
1382 struct file *filp;
1383 int ret = 0;
1384
1385 /* If the open_intent is for execute, we have an extra check to make */
1386 if (ctx->mode & FMODE_EXEC) {
Al Viro3d4ff432011-06-22 18:40:12 -04001387 ret = nfs_may_open(ctx->dentry->d_inode,
Trond Myklebustcd9a1c02010-09-17 10:56:50 -04001388 ctx->cred,
1389 nd->intent.open.flags);
1390 if (ret < 0)
1391 goto out;
1392 }
Al Viro3d4ff432011-06-22 18:40:12 -04001393 filp = lookup_instantiate_filp(nd, ctx->dentry, do_open);
Trond Myklebustcd9a1c02010-09-17 10:56:50 -04001394 if (IS_ERR(filp))
1395 ret = PTR_ERR(filp);
1396 else
1397 nfs_file_set_open_context(filp, ctx);
1398out:
1399 put_nfs_open_context(ctx);
1400 return ret;
1401}
1402
Linus Torvalds1da177e2005-04-16 15:20:36 -07001403static struct dentry *nfs_atomic_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
1404{
Trond Myklebustcd9a1c02010-09-17 10:56:50 -04001405 struct nfs_open_context *ctx;
1406 struct iattr attr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001407 struct dentry *res = NULL;
Trond Myklebustf46e0bd2010-09-17 10:56:50 -04001408 struct inode *inode;
Trond Myklebustcd9a1c02010-09-17 10:56:50 -04001409 int open_flags;
Trond Myklebust898f6352010-10-23 11:24:25 -04001410 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001411
Chuck Lever1e7cb3d2006-03-20 13:44:24 -05001412 dfprintk(VFS, "NFS: atomic_lookup(%s/%ld), %s\n",
1413 dir->i_sb->s_id, dir->i_ino, dentry->d_name.name);
1414
Linus Torvalds1da177e2005-04-16 15:20:36 -07001415 /* Check that we are indeed trying to open this file */
Trond Myklebust5584c302008-12-23 15:21:54 -05001416 if (!is_atomic_open(nd))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001417 goto no_open;
1418
1419 if (dentry->d_name.len > NFS_SERVER(dir)->namelen) {
1420 res = ERR_PTR(-ENAMETOOLONG);
1421 goto out;
1422 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001423
Trond Myklebustd4d9cdc2007-10-02 18:38:53 -04001424 /* Let vfs_create() deal with O_EXCL. Instantiate, but don't hash
1425 * the dentry. */
Al Viro35165862008-08-05 03:00:49 -04001426 if (nd->flags & LOOKUP_EXCL) {
Trond Myklebustd4d9cdc2007-10-02 18:38:53 -04001427 d_instantiate(dentry, NULL);
Trond Myklebust02a913a2005-10-18 14:20:17 -07001428 goto out;
1429 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001430
Al Viro51141592011-06-22 18:47:28 -04001431 open_flags = nd->intent.open.flags;
Trond Myklebust451146b2012-04-18 16:29:11 -04001432 attr.ia_valid = ATTR_OPEN;
Al Viro51141592011-06-22 18:47:28 -04001433
1434 ctx = create_nfs_open_context(dentry, open_flags);
Trond Myklebustcd9a1c02010-09-17 10:56:50 -04001435 res = ERR_CAST(ctx);
1436 if (IS_ERR(ctx))
1437 goto out;
1438
Trond Myklebustcd9a1c02010-09-17 10:56:50 -04001439 if (nd->flags & LOOKUP_CREATE) {
1440 attr.ia_mode = nd->intent.open.create_mode;
Trond Myklebust536e43d2012-01-17 22:04:26 -05001441 attr.ia_valid |= ATTR_MODE;
Aneesh Kumar K.Va8a5da92010-12-09 11:35:14 +00001442 attr.ia_mode &= ~current_umask();
Trond Myklebust536e43d2012-01-17 22:04:26 -05001443 } else
Trond Myklebust898f6352010-10-23 11:24:25 -04001444 open_flags &= ~(O_EXCL | O_CREAT);
Trond Myklebust536e43d2012-01-17 22:04:26 -05001445
1446 if (open_flags & O_TRUNC) {
1447 attr.ia_valid |= ATTR_SIZE;
1448 attr.ia_size = 0;
Trond Myklebustcd9a1c02010-09-17 10:56:50 -04001449 }
1450
Linus Torvalds1da177e2005-04-16 15:20:36 -07001451 /* Open the file on the server */
Trond Myklebustf46e0bd2010-09-17 10:56:50 -04001452 nfs_block_sillyrename(dentry->d_parent);
Trond Myklebust2b484292010-09-17 10:56:51 -04001453 inode = NFS_PROTO(dir)->open_context(dir, ctx, open_flags, &attr);
Trond Myklebustf46e0bd2010-09-17 10:56:50 -04001454 if (IS_ERR(inode)) {
1455 nfs_unblock_sillyrename(dentry->d_parent);
Trond Myklebustcd9a1c02010-09-17 10:56:50 -04001456 put_nfs_open_context(ctx);
Trond Myklebustf46e0bd2010-09-17 10:56:50 -04001457 switch (PTR_ERR(inode)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001458 /* Make a negative dentry */
1459 case -ENOENT:
Trond Myklebustf46e0bd2010-09-17 10:56:50 -04001460 d_add(dentry, NULL);
Trond Myklebust02a913a2005-10-18 14:20:17 -07001461 res = NULL;
1462 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001463 /* This turned out not to be a regular file */
Jeff Layton1788ea62011-11-04 13:31:21 -04001464 case -EISDIR:
Trond Myklebust6f926b52005-10-18 14:20:18 -07001465 case -ENOTDIR:
1466 goto no_open;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001467 case -ELOOP:
1468 if (!(nd->intent.open.flags & O_NOFOLLOW))
1469 goto no_open;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001470 /* case -EINVAL: */
1471 default:
Trond Myklebustf46e0bd2010-09-17 10:56:50 -04001472 res = ERR_CAST(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001473 goto out;
1474 }
Trond Myklebustcd9a1c02010-09-17 10:56:50 -04001475 }
Trond Myklebustf46e0bd2010-09-17 10:56:50 -04001476 res = d_add_unique(dentry, inode);
Trond Myklebust898f6352010-10-23 11:24:25 -04001477 nfs_unblock_sillyrename(dentry->d_parent);
Trond Myklebustf46e0bd2010-09-17 10:56:50 -04001478 if (res != NULL) {
Al Viro3d4ff432011-06-22 18:40:12 -04001479 dput(ctx->dentry);
1480 ctx->dentry = dget(res);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001481 dentry = res;
Trond Myklebustf46e0bd2010-09-17 10:56:50 -04001482 }
Trond Myklebust898f6352010-10-23 11:24:25 -04001483 err = nfs_intent_set_file(nd, ctx);
1484 if (err < 0) {
1485 if (res != NULL)
1486 dput(res);
1487 return ERR_PTR(err);
1488 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001489out:
Trond Myklebustf46e0bd2010-09-17 10:56:50 -04001490 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001491 return res;
1492no_open:
1493 return nfs_lookup(dir, dentry, nd);
1494}
1495
1496static int nfs_open_revalidate(struct dentry *dentry, struct nameidata *nd)
1497{
1498 struct dentry *parent = NULL;
Nick Piggin657e94b2011-01-14 02:48:39 +00001499 struct inode *inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001500 struct inode *dir;
Trond Myklebustb8d4cad2010-09-17 10:56:51 -04001501 struct nfs_open_context *ctx;
Trond Myklebust536e43d2012-01-17 22:04:26 -05001502 struct iattr attr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001503 int openflags, ret = 0;
1504
Nick Piggin657e94b2011-01-14 02:48:39 +00001505 if (nd->flags & LOOKUP_RCU)
1506 return -ECHILD;
1507
1508 inode = dentry->d_inode;
Trond Myklebust1f063d22010-04-22 15:35:55 -04001509 if (!is_atomic_open(nd) || d_mountpoint(dentry))
Trond Myklebust5584c302008-12-23 15:21:54 -05001510 goto no_open;
Trond Myklebust2b484292010-09-17 10:56:51 -04001511
Linus Torvalds1da177e2005-04-16 15:20:36 -07001512 parent = dget_parent(dentry);
1513 dir = parent->d_inode;
Trond Myklebust2b484292010-09-17 10:56:51 -04001514
Linus Torvalds1da177e2005-04-16 15:20:36 -07001515 /* We can't create new files in nfs_open_revalidate(), so we
1516 * optimize away revalidation of negative dentries.
1517 */
Trond Myklebust216d5d02007-10-01 20:10:12 -04001518 if (inode == NULL) {
1519 if (!nfs_neg_need_reval(dir, dentry, nd))
1520 ret = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001521 goto out;
Trond Myklebust216d5d02007-10-01 20:10:12 -04001522 }
1523
Linus Torvalds1da177e2005-04-16 15:20:36 -07001524 /* NFS only supports OPEN on regular files */
1525 if (!S_ISREG(inode->i_mode))
Trond Myklebust5584c302008-12-23 15:21:54 -05001526 goto no_open_dput;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001527 openflags = nd->intent.open.flags;
1528 /* We cannot do exclusive creation on a positive dentry */
1529 if ((openflags & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL))
Trond Myklebust5584c302008-12-23 15:21:54 -05001530 goto no_open_dput;
Trond Myklebust536e43d2012-01-17 22:04:26 -05001531 /* We can't create new files here */
1532 openflags &= ~(O_CREAT|O_EXCL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001533
Al Viro51141592011-06-22 18:47:28 -04001534 ctx = create_nfs_open_context(dentry, openflags);
Trond Myklebustb8d4cad2010-09-17 10:56:51 -04001535 ret = PTR_ERR(ctx);
1536 if (IS_ERR(ctx))
1537 goto out;
Trond Myklebust536e43d2012-01-17 22:04:26 -05001538
Trond Myklebust451146b2012-04-18 16:29:11 -04001539 attr.ia_valid = ATTR_OPEN;
Trond Myklebust536e43d2012-01-17 22:04:26 -05001540 if (openflags & O_TRUNC) {
1541 attr.ia_valid |= ATTR_SIZE;
1542 attr.ia_size = 0;
1543 nfs_wb_all(inode);
1544 }
1545
Linus Torvalds1da177e2005-04-16 15:20:36 -07001546 /*
Jes Sorensen1b1dcc12006-01-09 15:59:24 -08001547 * Note: we're not holding inode->i_mutex and so may be racing with
Linus Torvalds1da177e2005-04-16 15:20:36 -07001548 * operations that change the directory. We therefore save the
1549 * change attribute *before* we do the RPC call.
1550 */
Trond Myklebust536e43d2012-01-17 22:04:26 -05001551 inode = NFS_PROTO(dir)->open_context(dir, ctx, openflags, &attr);
Trond Myklebust535918f2010-09-17 10:56:51 -04001552 if (IS_ERR(inode)) {
1553 ret = PTR_ERR(inode);
1554 switch (ret) {
1555 case -EPERM:
1556 case -EACCES:
1557 case -EDQUOT:
1558 case -ENOSPC:
1559 case -EROFS:
1560 goto out_put_ctx;
1561 default:
1562 goto out_drop;
1563 }
1564 }
1565 iput(inode);
Trond Myklebust898f6352010-10-23 11:24:25 -04001566 if (inode != dentry->d_inode)
Trond Myklebust535918f2010-09-17 10:56:51 -04001567 goto out_drop;
Trond Myklebust898f6352010-10-23 11:24:25 -04001568
1569 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1570 ret = nfs_intent_set_file(nd, ctx);
1571 if (ret >= 0)
1572 ret = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001573out:
1574 dput(parent);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001575 return ret;
Trond Myklebust535918f2010-09-17 10:56:51 -04001576out_drop:
1577 d_drop(dentry);
1578 ret = 0;
1579out_put_ctx:
1580 put_nfs_open_context(ctx);
1581 goto out;
1582
Trond Myklebust5584c302008-12-23 15:21:54 -05001583no_open_dput:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001584 dput(parent);
Trond Myklebust5584c302008-12-23 15:21:54 -05001585no_open:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001586 return nfs_lookup_revalidate(dentry, nd);
1587}
Trond Myklebustc0204fd2010-09-17 10:56:51 -04001588
Al Viro4acdaf22011-07-26 01:42:34 -04001589static int nfs_open_create(struct inode *dir, struct dentry *dentry,
1590 umode_t mode, struct nameidata *nd)
Trond Myklebustc0204fd2010-09-17 10:56:51 -04001591{
1592 struct nfs_open_context *ctx = NULL;
1593 struct iattr attr;
1594 int error;
Al Viro8a5e9292011-06-25 19:15:54 -04001595 int open_flags = O_CREAT|O_EXCL;
Trond Myklebustc0204fd2010-09-17 10:56:51 -04001596
1597 dfprintk(VFS, "NFS: create(%s/%ld), %s\n",
1598 dir->i_sb->s_id, dir->i_ino, dentry->d_name.name);
1599
1600 attr.ia_mode = mode;
1601 attr.ia_valid = ATTR_MODE;
1602
Al Virodd7dd552011-06-25 21:17:17 -04001603 if (nd)
Trond Myklebustc0204fd2010-09-17 10:56:51 -04001604 open_flags = nd->intent.open.flags;
1605
Al Virof7c85862011-06-22 18:53:18 -04001606 ctx = create_nfs_open_context(dentry, open_flags);
1607 error = PTR_ERR(ctx);
1608 if (IS_ERR(ctx))
1609 goto out_err_drop;
Trond Myklebustc0204fd2010-09-17 10:56:51 -04001610
1611 error = NFS_PROTO(dir)->create(dir, dentry, &attr, open_flags, ctx);
1612 if (error != 0)
1613 goto out_put_ctx;
Al Virodd7dd552011-06-25 21:17:17 -04001614 if (nd) {
Trond Myklebust898f6352010-10-23 11:24:25 -04001615 error = nfs_intent_set_file(nd, ctx);
1616 if (error < 0)
1617 goto out_err;
Al Virof7c85862011-06-22 18:53:18 -04001618 } else {
1619 put_nfs_open_context(ctx);
Trond Myklebust898f6352010-10-23 11:24:25 -04001620 }
Trond Myklebustc0204fd2010-09-17 10:56:51 -04001621 return 0;
1622out_put_ctx:
Al Virof7c85862011-06-22 18:53:18 -04001623 put_nfs_open_context(ctx);
Trond Myklebust898f6352010-10-23 11:24:25 -04001624out_err_drop:
Trond Myklebustc0204fd2010-09-17 10:56:51 -04001625 d_drop(dentry);
Trond Myklebust898f6352010-10-23 11:24:25 -04001626out_err:
Trond Myklebustc0204fd2010-09-17 10:56:51 -04001627 return error;
1628}
1629
Linus Torvalds1da177e2005-04-16 15:20:36 -07001630#endif /* CONFIG_NFSV4 */
1631
Linus Torvalds1da177e2005-04-16 15:20:36 -07001632/*
1633 * Code common to create, mkdir, and mknod.
1634 */
1635int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fhandle,
1636 struct nfs_fattr *fattr)
1637{
Trond Myklebustfab728e2007-09-29 17:41:33 -04001638 struct dentry *parent = dget_parent(dentry);
1639 struct inode *dir = parent->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001640 struct inode *inode;
1641 int error = -EACCES;
1642
Trond Myklebustfab728e2007-09-29 17:41:33 -04001643 d_drop(dentry);
1644
Linus Torvalds1da177e2005-04-16 15:20:36 -07001645 /* We may have been initialized further down */
1646 if (dentry->d_inode)
Trond Myklebustfab728e2007-09-29 17:41:33 -04001647 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001648 if (fhandle->size == 0) {
Bryan Schumaker7c513052011-03-24 17:12:24 +00001649 error = NFS_PROTO(dir)->lookup(NFS_SERVER(dir)->client, dir, &dentry->d_name, fhandle, fattr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001650 if (error)
Trond Myklebustfab728e2007-09-29 17:41:33 -04001651 goto out_error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001652 }
Trond Myklebust5724ab32007-10-01 21:51:38 -04001653 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001654 if (!(fattr->valid & NFS_ATTR_FATTR)) {
1655 struct nfs_server *server = NFS_SB(dentry->d_sb);
David Howells8fa5c002006-08-22 20:06:12 -04001656 error = server->nfs_client->rpc_ops->getattr(server, fhandle, fattr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001657 if (error < 0)
Trond Myklebustfab728e2007-09-29 17:41:33 -04001658 goto out_error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001659 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001660 inode = nfs_fhget(dentry->d_sb, fhandle, fattr);
Trond Myklebust03f28e32006-03-20 13:44:48 -05001661 error = PTR_ERR(inode);
1662 if (IS_ERR(inode))
Trond Myklebustfab728e2007-09-29 17:41:33 -04001663 goto out_error;
1664 d_add(dentry, inode);
1665out:
1666 dput(parent);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001667 return 0;
Trond Myklebustfab728e2007-09-29 17:41:33 -04001668out_error:
1669 nfs_mark_for_revalidate(dir);
1670 dput(parent);
1671 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001672}
1673
1674/*
1675 * Following a failed create operation, we drop the dentry rather
1676 * than retain a negative dentry. This avoids a problem in the event
1677 * that the operation succeeded on the server, but an error in the
1678 * reply path made it appear to have failed.
1679 */
Al Viro4acdaf22011-07-26 01:42:34 -04001680static int nfs_create(struct inode *dir, struct dentry *dentry,
1681 umode_t mode, struct nameidata *nd)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001682{
1683 struct iattr attr;
1684 int error;
Al Viro8a5e9292011-06-25 19:15:54 -04001685 int open_flags = O_CREAT|O_EXCL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001686
Chuck Lever1e7cb3d2006-03-20 13:44:24 -05001687 dfprintk(VFS, "NFS: create(%s/%ld), %s\n",
1688 dir->i_sb->s_id, dir->i_ino, dentry->d_name.name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001689
1690 attr.ia_mode = mode;
1691 attr.ia_valid = ATTR_MODE;
1692
Al Virodd7dd552011-06-25 21:17:17 -04001693 if (nd)
Trond Myklebust8a0eebf2011-01-13 14:15:50 -05001694 open_flags = nd->intent.open.flags;
1695
1696 error = NFS_PROTO(dir)->create(dir, dentry, &attr, open_flags, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001697 if (error != 0)
1698 goto out_err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001699 return 0;
1700out_err:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001701 d_drop(dentry);
1702 return error;
1703}
1704
1705/*
1706 * See comments for nfs_proc_create regarding failed operations.
1707 */
1708static int
Al Viro1a67aaf2011-07-26 01:52:52 -04001709nfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t rdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001710{
1711 struct iattr attr;
1712 int status;
1713
Chuck Lever1e7cb3d2006-03-20 13:44:24 -05001714 dfprintk(VFS, "NFS: mknod(%s/%ld), %s\n",
1715 dir->i_sb->s_id, dir->i_ino, dentry->d_name.name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001716
1717 if (!new_valid_dev(rdev))
1718 return -EINVAL;
1719
1720 attr.ia_mode = mode;
1721 attr.ia_valid = ATTR_MODE;
1722
Linus Torvalds1da177e2005-04-16 15:20:36 -07001723 status = NFS_PROTO(dir)->mknod(dir, dentry, &attr, rdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001724 if (status != 0)
1725 goto out_err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001726 return 0;
1727out_err:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001728 d_drop(dentry);
1729 return status;
1730}
1731
1732/*
1733 * See comments for nfs_proc_create regarding failed operations.
1734 */
Al Viro18bb1db2011-07-26 01:41:39 -04001735static int nfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001736{
1737 struct iattr attr;
1738 int error;
1739
Chuck Lever1e7cb3d2006-03-20 13:44:24 -05001740 dfprintk(VFS, "NFS: mkdir(%s/%ld), %s\n",
1741 dir->i_sb->s_id, dir->i_ino, dentry->d_name.name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001742
1743 attr.ia_valid = ATTR_MODE;
1744 attr.ia_mode = mode | S_IFDIR;
1745
Linus Torvalds1da177e2005-04-16 15:20:36 -07001746 error = NFS_PROTO(dir)->mkdir(dir, dentry, &attr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001747 if (error != 0)
1748 goto out_err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001749 return 0;
1750out_err:
1751 d_drop(dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001752 return error;
1753}
1754
Trond Myklebustd45b9d82008-01-28 19:43:18 -05001755static void nfs_dentry_handle_enoent(struct dentry *dentry)
1756{
1757 if (dentry->d_inode != NULL && !d_unhashed(dentry))
1758 d_delete(dentry);
1759}
1760
Linus Torvalds1da177e2005-04-16 15:20:36 -07001761static int nfs_rmdir(struct inode *dir, struct dentry *dentry)
1762{
1763 int error;
1764
Chuck Lever1e7cb3d2006-03-20 13:44:24 -05001765 dfprintk(VFS, "NFS: rmdir(%s/%ld), %s\n",
1766 dir->i_sb->s_id, dir->i_ino, dentry->d_name.name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001767
Linus Torvalds1da177e2005-04-16 15:20:36 -07001768 error = NFS_PROTO(dir)->rmdir(dir, &dentry->d_name);
1769 /* Ensure the VFS deletes this inode */
1770 if (error == 0 && dentry->d_inode != NULL)
Dave Hansence71ec32006-09-30 23:29:06 -07001771 clear_nlink(dentry->d_inode);
Trond Myklebustd45b9d82008-01-28 19:43:18 -05001772 else if (error == -ENOENT)
1773 nfs_dentry_handle_enoent(dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001774
1775 return error;
1776}
1777
Linus Torvalds1da177e2005-04-16 15:20:36 -07001778/*
1779 * Remove a file after making sure there are no pending writes,
1780 * and after checking that the file has only one user.
1781 *
1782 * We invalidate the attribute cache and free the inode prior to the operation
1783 * to avoid possible races if the server reuses the inode.
1784 */
1785static int nfs_safe_remove(struct dentry *dentry)
1786{
1787 struct inode *dir = dentry->d_parent->d_inode;
1788 struct inode *inode = dentry->d_inode;
1789 int error = -EBUSY;
1790
1791 dfprintk(VFS, "NFS: safe_remove(%s/%s)\n",
1792 dentry->d_parent->d_name.name, dentry->d_name.name);
1793
1794 /* If the dentry was sillyrenamed, we simply call d_delete() */
1795 if (dentry->d_flags & DCACHE_NFSFS_RENAMED) {
1796 error = 0;
1797 goto out;
1798 }
1799
Linus Torvalds1da177e2005-04-16 15:20:36 -07001800 if (inode != NULL) {
Trond Myklebustcae7a072005-10-18 14:20:19 -07001801 nfs_inode_return_delegation(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001802 error = NFS_PROTO(dir)->remove(dir, &dentry->d_name);
1803 /* The VFS may want to delete this inode */
1804 if (error == 0)
Trond Myklebust1b83d702008-06-11 15:44:04 -04001805 nfs_drop_nlink(inode);
Trond Myklebust5ba7cc42005-12-03 15:20:17 -05001806 nfs_mark_for_revalidate(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001807 } else
1808 error = NFS_PROTO(dir)->remove(dir, &dentry->d_name);
Trond Myklebustd45b9d82008-01-28 19:43:18 -05001809 if (error == -ENOENT)
1810 nfs_dentry_handle_enoent(dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001811out:
1812 return error;
1813}
1814
1815/* We do silly rename. In case sillyrename() returns -EBUSY, the inode
1816 * belongs to an active ".nfs..." file and we return -EBUSY.
1817 *
1818 * If sillyrename() returns 0, we do nothing, otherwise we unlink.
1819 */
1820static int nfs_unlink(struct inode *dir, struct dentry *dentry)
1821{
1822 int error;
1823 int need_rehash = 0;
1824
1825 dfprintk(VFS, "NFS: unlink(%s/%ld, %s)\n", dir->i_sb->s_id,
1826 dir->i_ino, dentry->d_name.name);
1827
Linus Torvalds1da177e2005-04-16 15:20:36 -07001828 spin_lock(&dentry->d_lock);
Nick Pigginb7ab39f2011-01-07 17:49:32 +11001829 if (dentry->d_count > 1) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001830 spin_unlock(&dentry->d_lock);
Trond Myklebustccfeb502007-01-13 02:28:12 -05001831 /* Start asynchronous writeout of the inode */
1832 write_inode_now(dentry->d_inode, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001833 error = nfs_sillyrename(dir, dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001834 return error;
1835 }
1836 if (!d_unhashed(dentry)) {
1837 __d_drop(dentry);
1838 need_rehash = 1;
1839 }
1840 spin_unlock(&dentry->d_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001841 error = nfs_safe_remove(dentry);
Trond Myklebustd45b9d82008-01-28 19:43:18 -05001842 if (!error || error == -ENOENT) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001843 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1844 } else if (need_rehash)
1845 d_rehash(dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001846 return error;
1847}
1848
Chuck Lever873101b2006-08-22 20:06:23 -04001849/*
1850 * To create a symbolic link, most file systems instantiate a new inode,
1851 * add a page to it containing the path, then write it out to the disk
1852 * using prepare_write/commit_write.
1853 *
1854 * Unfortunately the NFS client can't create the in-core inode first
1855 * because it needs a file handle to create an in-core inode (see
1856 * fs/nfs/inode.c:nfs_fhget). We only have a file handle *after* the
1857 * symlink request has completed on the server.
1858 *
1859 * So instead we allocate a raw page, copy the symname into it, then do
1860 * the SYMLINK request with the page as the buffer. If it succeeds, we
1861 * now have a new file handle and can instantiate an in-core NFS inode
1862 * and move the raw page into its mapping.
1863 */
1864static int nfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001865{
Chuck Lever873101b2006-08-22 20:06:23 -04001866 struct pagevec lru_pvec;
1867 struct page *page;
1868 char *kaddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001869 struct iattr attr;
Chuck Lever873101b2006-08-22 20:06:23 -04001870 unsigned int pathlen = strlen(symname);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001871 int error;
1872
1873 dfprintk(VFS, "NFS: symlink(%s/%ld, %s, %s)\n", dir->i_sb->s_id,
1874 dir->i_ino, dentry->d_name.name, symname);
1875
Chuck Lever873101b2006-08-22 20:06:23 -04001876 if (pathlen > PAGE_SIZE)
1877 return -ENAMETOOLONG;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001878
Chuck Lever873101b2006-08-22 20:06:23 -04001879 attr.ia_mode = S_IFLNK | S_IRWXUGO;
1880 attr.ia_valid = ATTR_MODE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001881
Jeff Layton83d93f22007-06-07 09:58:08 -04001882 page = alloc_page(GFP_HIGHUSER);
Trond Myklebust76566992008-06-11 15:44:22 -04001883 if (!page)
Chuck Lever873101b2006-08-22 20:06:23 -04001884 return -ENOMEM;
Chuck Lever873101b2006-08-22 20:06:23 -04001885
Cong Wang2b86ce22011-11-25 23:14:33 +08001886 kaddr = kmap_atomic(page);
Chuck Lever873101b2006-08-22 20:06:23 -04001887 memcpy(kaddr, symname, pathlen);
1888 if (pathlen < PAGE_SIZE)
1889 memset(kaddr + pathlen, 0, PAGE_SIZE - pathlen);
Cong Wang2b86ce22011-11-25 23:14:33 +08001890 kunmap_atomic(kaddr);
Chuck Lever873101b2006-08-22 20:06:23 -04001891
Chuck Lever94a6d752006-08-22 20:06:23 -04001892 error = NFS_PROTO(dir)->symlink(dir, dentry, page, pathlen, &attr);
Chuck Lever873101b2006-08-22 20:06:23 -04001893 if (error != 0) {
1894 dfprintk(VFS, "NFS: symlink(%s/%ld, %s, %s) error %d\n",
1895 dir->i_sb->s_id, dir->i_ino,
1896 dentry->d_name.name, symname, error);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001897 d_drop(dentry);
Chuck Lever873101b2006-08-22 20:06:23 -04001898 __free_page(page);
Chuck Lever873101b2006-08-22 20:06:23 -04001899 return error;
1900 }
1901
1902 /*
1903 * No big deal if we can't add this page to the page cache here.
1904 * READLINK will get the missing page from the server if needed.
1905 */
1906 pagevec_init(&lru_pvec, 0);
1907 if (!add_to_page_cache(page, dentry->d_inode->i_mapping, 0,
1908 GFP_KERNEL)) {
Chuck Lever39cf8a12006-10-19 23:28:41 -07001909 pagevec_add(&lru_pvec, page);
Rik van Riel4f98a2f2008-10-18 20:26:32 -07001910 pagevec_lru_add_file(&lru_pvec);
Chuck Lever873101b2006-08-22 20:06:23 -04001911 SetPageUptodate(page);
1912 unlock_page(page);
1913 } else
1914 __free_page(page);
1915
Chuck Lever873101b2006-08-22 20:06:23 -04001916 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001917}
1918
1919static int
1920nfs_link(struct dentry *old_dentry, struct inode *dir, struct dentry *dentry)
1921{
1922 struct inode *inode = old_dentry->d_inode;
1923 int error;
1924
1925 dfprintk(VFS, "NFS: link(%s/%s -> %s/%s)\n",
1926 old_dentry->d_parent->d_name.name, old_dentry->d_name.name,
1927 dentry->d_parent->d_name.name, dentry->d_name.name);
1928
Trond Myklebust9a3936a2009-10-26 08:09:46 -04001929 nfs_inode_return_delegation(inode);
1930
Trond Myklebust9697d232007-10-02 21:58:05 -04001931 d_drop(dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001932 error = NFS_PROTO(dir)->link(inode, dir, &dentry->d_name);
Trond Myklebustcf809552005-10-27 22:12:42 -04001933 if (error == 0) {
Al Viro7de9c6e2010-10-23 11:11:40 -04001934 ihold(inode);
Trond Myklebust9697d232007-10-02 21:58:05 -04001935 d_add(dentry, inode);
Trond Myklebustcf809552005-10-27 22:12:42 -04001936 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001937 return error;
1938}
1939
1940/*
1941 * RENAME
1942 * FIXME: Some nfsds, like the Linux user space nfsd, may generate a
1943 * different file handle for the same inode after a rename (e.g. when
1944 * moving to a different directory). A fail-safe method to do so would
1945 * be to look up old_dir/old_name, create a link to new_dir/new_name and
1946 * rename the old file using the sillyrename stuff. This way, the original
1947 * file in old_dir will go away when the last process iput()s the inode.
1948 *
1949 * FIXED.
1950 *
1951 * It actually works quite well. One needs to have the possibility for
1952 * at least one ".nfs..." file in each directory the file ever gets
1953 * moved or linked to which happens automagically with the new
1954 * implementation that only depends on the dcache stuff instead of
1955 * using the inode layer
1956 *
1957 * Unfortunately, things are a little more complicated than indicated
1958 * above. For a cross-directory move, we want to make sure we can get
1959 * rid of the old inode after the operation. This means there must be
1960 * no pending writes (if it's a file), and the use count must be 1.
1961 * If these conditions are met, we can drop the dentries before doing
1962 * the rename.
1963 */
1964static int nfs_rename(struct inode *old_dir, struct dentry *old_dentry,
1965 struct inode *new_dir, struct dentry *new_dentry)
1966{
1967 struct inode *old_inode = old_dentry->d_inode;
1968 struct inode *new_inode = new_dentry->d_inode;
1969 struct dentry *dentry = NULL, *rehash = NULL;
1970 int error = -EBUSY;
1971
Linus Torvalds1da177e2005-04-16 15:20:36 -07001972 dfprintk(VFS, "NFS: rename(%s/%s -> %s/%s, ct=%d)\n",
1973 old_dentry->d_parent->d_name.name, old_dentry->d_name.name,
1974 new_dentry->d_parent->d_name.name, new_dentry->d_name.name,
Nick Pigginb7ab39f2011-01-07 17:49:32 +11001975 new_dentry->d_count);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001976
1977 /*
Miklos Szeredi28f79a12009-12-03 15:58:56 -05001978 * For non-directories, check whether the target is busy and if so,
1979 * make a copy of the dentry and then do a silly-rename. If the
1980 * silly-rename succeeds, the copied dentry is hashed and becomes
1981 * the new target.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001982 */
Miklos Szeredi27226102009-12-03 15:58:56 -05001983 if (new_inode && !S_ISDIR(new_inode->i_mode)) {
1984 /*
1985 * To prevent any new references to the target during the
1986 * rename, we unhash the dentry in advance.
1987 */
1988 if (!d_unhashed(new_dentry)) {
1989 d_drop(new_dentry);
1990 rehash = new_dentry;
1991 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001992
Nick Pigginb7ab39f2011-01-07 17:49:32 +11001993 if (new_dentry->d_count > 2) {
Miklos Szeredi27226102009-12-03 15:58:56 -05001994 int err;
1995
1996 /* copy the target dentry's name */
1997 dentry = d_alloc(new_dentry->d_parent,
1998 &new_dentry->d_name);
1999 if (!dentry)
2000 goto out;
2001
2002 /* silly-rename the existing target ... */
2003 err = nfs_sillyrename(new_dir, new_dentry);
Miklos Szeredi24e93022009-12-03 15:58:56 -05002004 if (err)
Miklos Szeredi27226102009-12-03 15:58:56 -05002005 goto out;
Miklos Szeredi24e93022009-12-03 15:58:56 -05002006
2007 new_dentry = dentry;
OGAWA Hirofumi56335932010-01-06 18:48:26 -05002008 rehash = NULL;
Miklos Szeredi24e93022009-12-03 15:58:56 -05002009 new_inode = NULL;
Miklos Szeredi27226102009-12-03 15:58:56 -05002010 }
Trond Myklebustb1e4adf2009-03-19 15:35:49 -04002011 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002012
Trond Myklebustcae7a072005-10-18 14:20:19 -07002013 nfs_inode_return_delegation(old_inode);
Trond Myklebustb1e4adf2009-03-19 15:35:49 -04002014 if (new_inode != NULL)
Trond Myklebust24174112006-01-03 09:55:33 +01002015 nfs_inode_return_delegation(new_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002016
Linus Torvalds1da177e2005-04-16 15:20:36 -07002017 error = NFS_PROTO(old_dir)->rename(old_dir, &old_dentry->d_name,
2018 new_dir, &new_dentry->d_name);
Trond Myklebust5ba7cc42005-12-03 15:20:17 -05002019 nfs_mark_for_revalidate(old_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002020out:
2021 if (rehash)
2022 d_rehash(rehash);
2023 if (!error) {
Trond Myklebustb1e4adf2009-03-19 15:35:49 -04002024 if (new_inode != NULL)
2025 nfs_drop_nlink(new_inode);
Mark Fasheh349457c2006-09-08 14:22:21 -07002026 d_move(old_dentry, new_dentry);
Chuck Lever8fb559f2007-09-24 15:40:16 -04002027 nfs_set_verifier(new_dentry,
2028 nfs_save_change_attribute(new_dir));
Trond Myklebustd45b9d82008-01-28 19:43:18 -05002029 } else if (error == -ENOENT)
2030 nfs_dentry_handle_enoent(old_dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002031
2032 /* new dentry created? */
2033 if (dentry)
2034 dput(dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002035 return error;
2036}
2037
Trond Myklebustcfcea3e2006-07-25 11:28:18 -04002038static DEFINE_SPINLOCK(nfs_access_lru_lock);
2039static LIST_HEAD(nfs_access_lru_list);
2040static atomic_long_t nfs_access_nr_entries;
2041
Trond Myklebust1c3c07e2006-07-25 11:28:18 -04002042static void nfs_access_free_entry(struct nfs_access_entry *entry)
2043{
2044 put_rpccred(entry->cred);
2045 kfree(entry);
Trond Myklebustcfcea3e2006-07-25 11:28:18 -04002046 smp_mb__before_atomic_dec();
2047 atomic_long_dec(&nfs_access_nr_entries);
2048 smp_mb__after_atomic_dec();
Trond Myklebust1c3c07e2006-07-25 11:28:18 -04002049}
2050
Trond Myklebust1a81bb82010-05-13 12:51:06 -04002051static void nfs_access_free_list(struct list_head *head)
2052{
2053 struct nfs_access_entry *cache;
2054
2055 while (!list_empty(head)) {
2056 cache = list_entry(head->next, struct nfs_access_entry, lru);
2057 list_del(&cache->lru);
2058 nfs_access_free_entry(cache);
2059 }
2060}
2061
Ying Han1495f232011-05-24 17:12:27 -07002062int nfs_access_cache_shrinker(struct shrinker *shrink,
2063 struct shrink_control *sc)
Trond Myklebust979df722006-07-25 11:28:19 -04002064{
2065 LIST_HEAD(head);
Trond Myklebustaa510da2010-09-29 15:11:56 -04002066 struct nfs_inode *nfsi, *next;
Trond Myklebust979df722006-07-25 11:28:19 -04002067 struct nfs_access_entry *cache;
Ying Han1495f232011-05-24 17:12:27 -07002068 int nr_to_scan = sc->nr_to_scan;
2069 gfp_t gfp_mask = sc->gfp_mask;
Trond Myklebust979df722006-07-25 11:28:19 -04002070
Trond Myklebust61d5eb22010-05-13 12:51:06 -04002071 if ((gfp_mask & GFP_KERNEL) != GFP_KERNEL)
2072 return (nr_to_scan == 0) ? 0 : -1;
Trond Myklebust9c7e7e22010-05-13 12:51:06 -04002073
Trond Myklebusta50f7952007-06-05 19:23:43 -04002074 spin_lock(&nfs_access_lru_lock);
Trond Myklebustaa510da2010-09-29 15:11:56 -04002075 list_for_each_entry_safe(nfsi, next, &nfs_access_lru_list, access_cache_inode_lru) {
Trond Myklebust979df722006-07-25 11:28:19 -04002076 struct inode *inode;
2077
2078 if (nr_to_scan-- == 0)
2079 break;
Trond Myklebust9c7e7e22010-05-13 12:51:06 -04002080 inode = &nfsi->vfs_inode;
Trond Myklebust979df722006-07-25 11:28:19 -04002081 spin_lock(&inode->i_lock);
2082 if (list_empty(&nfsi->access_cache_entry_lru))
2083 goto remove_lru_entry;
2084 cache = list_entry(nfsi->access_cache_entry_lru.next,
2085 struct nfs_access_entry, lru);
2086 list_move(&cache->lru, &head);
2087 rb_erase(&cache->rb_node, &nfsi->access_cache);
2088 if (!list_empty(&nfsi->access_cache_entry_lru))
2089 list_move_tail(&nfsi->access_cache_inode_lru,
2090 &nfs_access_lru_list);
2091 else {
2092remove_lru_entry:
2093 list_del_init(&nfsi->access_cache_inode_lru);
Trond Myklebust9c7e7e22010-05-13 12:51:06 -04002094 smp_mb__before_clear_bit();
Trond Myklebust979df722006-07-25 11:28:19 -04002095 clear_bit(NFS_INO_ACL_LRU_SET, &nfsi->flags);
Trond Myklebust9c7e7e22010-05-13 12:51:06 -04002096 smp_mb__after_clear_bit();
Trond Myklebust979df722006-07-25 11:28:19 -04002097 }
Trond Myklebust59844a92010-05-26 08:42:24 -04002098 spin_unlock(&inode->i_lock);
Trond Myklebust979df722006-07-25 11:28:19 -04002099 }
2100 spin_unlock(&nfs_access_lru_lock);
Trond Myklebust1a81bb82010-05-13 12:51:06 -04002101 nfs_access_free_list(&head);
Trond Myklebust979df722006-07-25 11:28:19 -04002102 return (atomic_long_read(&nfs_access_nr_entries) / 100) * sysctl_vfs_cache_pressure;
2103}
2104
Trond Myklebust1a81bb82010-05-13 12:51:06 -04002105static void __nfs_access_zap_cache(struct nfs_inode *nfsi, struct list_head *head)
Trond Myklebust1c3c07e2006-07-25 11:28:18 -04002106{
Trond Myklebust1c3c07e2006-07-25 11:28:18 -04002107 struct rb_root *root_node = &nfsi->access_cache;
Trond Myklebust1a81bb82010-05-13 12:51:06 -04002108 struct rb_node *n;
Trond Myklebust1c3c07e2006-07-25 11:28:18 -04002109 struct nfs_access_entry *entry;
2110
2111 /* Unhook entries from the cache */
2112 while ((n = rb_first(root_node)) != NULL) {
2113 entry = rb_entry(n, struct nfs_access_entry, rb_node);
2114 rb_erase(n, root_node);
Trond Myklebust1a81bb82010-05-13 12:51:06 -04002115 list_move(&entry->lru, head);
Trond Myklebust1c3c07e2006-07-25 11:28:18 -04002116 }
2117 nfsi->cache_validity &= ~NFS_INO_INVALID_ACCESS;
Trond Myklebust1c3c07e2006-07-25 11:28:18 -04002118}
2119
2120void nfs_access_zap_cache(struct inode *inode)
2121{
Trond Myklebust1a81bb82010-05-13 12:51:06 -04002122 LIST_HEAD(head);
2123
2124 if (test_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags) == 0)
2125 return;
Trond Myklebustcfcea3e2006-07-25 11:28:18 -04002126 /* Remove from global LRU init */
Trond Myklebust1a81bb82010-05-13 12:51:06 -04002127 spin_lock(&nfs_access_lru_lock);
2128 if (test_and_clear_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags))
Trond Myklebustcfcea3e2006-07-25 11:28:18 -04002129 list_del_init(&NFS_I(inode)->access_cache_inode_lru);
Trond Myklebustcfcea3e2006-07-25 11:28:18 -04002130
Trond Myklebust1c3c07e2006-07-25 11:28:18 -04002131 spin_lock(&inode->i_lock);
Trond Myklebust1a81bb82010-05-13 12:51:06 -04002132 __nfs_access_zap_cache(NFS_I(inode), &head);
2133 spin_unlock(&inode->i_lock);
2134 spin_unlock(&nfs_access_lru_lock);
2135 nfs_access_free_list(&head);
Trond Myklebust1c3c07e2006-07-25 11:28:18 -04002136}
2137
2138static struct nfs_access_entry *nfs_access_search_rbtree(struct inode *inode, struct rpc_cred *cred)
2139{
2140 struct rb_node *n = NFS_I(inode)->access_cache.rb_node;
2141 struct nfs_access_entry *entry;
2142
2143 while (n != NULL) {
2144 entry = rb_entry(n, struct nfs_access_entry, rb_node);
2145
2146 if (cred < entry->cred)
2147 n = n->rb_left;
2148 else if (cred > entry->cred)
2149 n = n->rb_right;
2150 else
2151 return entry;
2152 }
2153 return NULL;
2154}
2155
Trond Myklebustaf22f942007-08-10 17:45:10 -04002156static int nfs_access_get_cached(struct inode *inode, struct rpc_cred *cred, struct nfs_access_entry *res)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002157{
Chuck Lever55296802005-08-18 11:24:09 -07002158 struct nfs_inode *nfsi = NFS_I(inode);
Trond Myklebust1c3c07e2006-07-25 11:28:18 -04002159 struct nfs_access_entry *cache;
2160 int err = -ENOENT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002161
Trond Myklebust1c3c07e2006-07-25 11:28:18 -04002162 spin_lock(&inode->i_lock);
2163 if (nfsi->cache_validity & NFS_INO_INVALID_ACCESS)
2164 goto out_zap;
2165 cache = nfs_access_search_rbtree(inode, cred);
2166 if (cache == NULL)
2167 goto out;
Trond Myklebustb4d23142010-03-10 15:21:44 -05002168 if (!nfs_have_delegated_attributes(inode) &&
Peter Staubach64672d52008-12-23 15:21:56 -05002169 !time_in_range_open(jiffies, cache->jiffies, cache->jiffies + nfsi->attrtimeo))
Trond Myklebust1c3c07e2006-07-25 11:28:18 -04002170 goto out_stale;
2171 res->jiffies = cache->jiffies;
2172 res->cred = cache->cred;
2173 res->mask = cache->mask;
Trond Myklebustcfcea3e2006-07-25 11:28:18 -04002174 list_move_tail(&cache->lru, &nfsi->access_cache_entry_lru);
Trond Myklebust1c3c07e2006-07-25 11:28:18 -04002175 err = 0;
2176out:
2177 spin_unlock(&inode->i_lock);
2178 return err;
2179out_stale:
2180 rb_erase(&cache->rb_node, &nfsi->access_cache);
Trond Myklebustcfcea3e2006-07-25 11:28:18 -04002181 list_del(&cache->lru);
Trond Myklebust1c3c07e2006-07-25 11:28:18 -04002182 spin_unlock(&inode->i_lock);
2183 nfs_access_free_entry(cache);
2184 return -ENOENT;
2185out_zap:
Trond Myklebust1a81bb82010-05-13 12:51:06 -04002186 spin_unlock(&inode->i_lock);
2187 nfs_access_zap_cache(inode);
Trond Myklebust1c3c07e2006-07-25 11:28:18 -04002188 return -ENOENT;
2189}
2190
2191static void nfs_access_add_rbtree(struct inode *inode, struct nfs_access_entry *set)
2192{
Trond Myklebustcfcea3e2006-07-25 11:28:18 -04002193 struct nfs_inode *nfsi = NFS_I(inode);
2194 struct rb_root *root_node = &nfsi->access_cache;
Trond Myklebust1c3c07e2006-07-25 11:28:18 -04002195 struct rb_node **p = &root_node->rb_node;
2196 struct rb_node *parent = NULL;
2197 struct nfs_access_entry *entry;
2198
2199 spin_lock(&inode->i_lock);
2200 while (*p != NULL) {
2201 parent = *p;
2202 entry = rb_entry(parent, struct nfs_access_entry, rb_node);
2203
2204 if (set->cred < entry->cred)
2205 p = &parent->rb_left;
2206 else if (set->cred > entry->cred)
2207 p = &parent->rb_right;
2208 else
2209 goto found;
2210 }
2211 rb_link_node(&set->rb_node, parent, p);
2212 rb_insert_color(&set->rb_node, root_node);
Trond Myklebustcfcea3e2006-07-25 11:28:18 -04002213 list_add_tail(&set->lru, &nfsi->access_cache_entry_lru);
Trond Myklebust1c3c07e2006-07-25 11:28:18 -04002214 spin_unlock(&inode->i_lock);
2215 return;
2216found:
2217 rb_replace_node(parent, &set->rb_node, root_node);
Trond Myklebustcfcea3e2006-07-25 11:28:18 -04002218 list_add_tail(&set->lru, &nfsi->access_cache_entry_lru);
2219 list_del(&entry->lru);
Trond Myklebust1c3c07e2006-07-25 11:28:18 -04002220 spin_unlock(&inode->i_lock);
2221 nfs_access_free_entry(entry);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002222}
2223
Trond Myklebustaf22f942007-08-10 17:45:10 -04002224static void nfs_access_add_cache(struct inode *inode, struct nfs_access_entry *set)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002225{
Trond Myklebust1c3c07e2006-07-25 11:28:18 -04002226 struct nfs_access_entry *cache = kmalloc(sizeof(*cache), GFP_KERNEL);
2227 if (cache == NULL)
2228 return;
2229 RB_CLEAR_NODE(&cache->rb_node);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002230 cache->jiffies = set->jiffies;
Trond Myklebust1c3c07e2006-07-25 11:28:18 -04002231 cache->cred = get_rpccred(set->cred);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002232 cache->mask = set->mask;
Trond Myklebust1c3c07e2006-07-25 11:28:18 -04002233
2234 nfs_access_add_rbtree(inode, cache);
Trond Myklebustcfcea3e2006-07-25 11:28:18 -04002235
2236 /* Update accounting */
2237 smp_mb__before_atomic_inc();
2238 atomic_long_inc(&nfs_access_nr_entries);
2239 smp_mb__after_atomic_inc();
2240
2241 /* Add inode to global LRU list */
Trond Myklebust1a81bb82010-05-13 12:51:06 -04002242 if (!test_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags)) {
Trond Myklebustcfcea3e2006-07-25 11:28:18 -04002243 spin_lock(&nfs_access_lru_lock);
Trond Myklebust1a81bb82010-05-13 12:51:06 -04002244 if (!test_and_set_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags))
2245 list_add_tail(&NFS_I(inode)->access_cache_inode_lru,
2246 &nfs_access_lru_list);
Trond Myklebustcfcea3e2006-07-25 11:28:18 -04002247 spin_unlock(&nfs_access_lru_lock);
2248 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002249}
2250
2251static int nfs_do_access(struct inode *inode, struct rpc_cred *cred, int mask)
2252{
2253 struct nfs_access_entry cache;
2254 int status;
2255
2256 status = nfs_access_get_cached(inode, cred, &cache);
2257 if (status == 0)
2258 goto out;
2259
2260 /* Be clever: ask server to check for all possible rights */
2261 cache.mask = MAY_EXEC | MAY_WRITE | MAY_READ;
2262 cache.cred = cred;
2263 cache.jiffies = jiffies;
2264 status = NFS_PROTO(inode)->access(inode, &cache);
Suresh Jayaramana71ee332009-03-10 20:33:21 -04002265 if (status != 0) {
2266 if (status == -ESTALE) {
2267 nfs_zap_caches(inode);
2268 if (!S_ISDIR(inode->i_mode))
2269 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
2270 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002271 return status;
Suresh Jayaramana71ee332009-03-10 20:33:21 -04002272 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002273 nfs_access_add_cache(inode, &cache);
2274out:
Al Viroe6305c42008-07-15 21:03:57 -04002275 if ((mask & ~cache.mask & (MAY_READ | MAY_WRITE | MAY_EXEC)) == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002276 return 0;
2277 return -EACCES;
2278}
2279
Trond Myklebustaf22f942007-08-10 17:45:10 -04002280static int nfs_open_permission_mask(int openflags)
2281{
2282 int mask = 0;
2283
Al Viro8a5e9292011-06-25 19:15:54 -04002284 if ((openflags & O_ACCMODE) != O_WRONLY)
Trond Myklebustaf22f942007-08-10 17:45:10 -04002285 mask |= MAY_READ;
Al Viro8a5e9292011-06-25 19:15:54 -04002286 if ((openflags & O_ACCMODE) != O_RDONLY)
Trond Myklebustaf22f942007-08-10 17:45:10 -04002287 mask |= MAY_WRITE;
Al Viro8a5e9292011-06-25 19:15:54 -04002288 if (openflags & __FMODE_EXEC)
Trond Myklebustaf22f942007-08-10 17:45:10 -04002289 mask |= MAY_EXEC;
2290 return mask;
2291}
2292
2293int nfs_may_open(struct inode *inode, struct rpc_cred *cred, int openflags)
2294{
2295 return nfs_do_access(inode, cred, nfs_open_permission_mask(openflags));
2296}
2297
Al Viro10556cb2011-06-20 19:28:19 -04002298int nfs_permission(struct inode *inode, int mask)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002299{
2300 struct rpc_cred *cred;
2301 int res = 0;
2302
Al Viro10556cb2011-06-20 19:28:19 -04002303 if (mask & MAY_NOT_BLOCK)
Nick Pigginb74c79e2011-01-07 17:49:58 +11002304 return -ECHILD;
2305
Chuck Lever91d5b472006-03-20 13:44:14 -05002306 nfs_inc_stats(inode, NFSIOS_VFSACCESS);
2307
Al Viroe6305c42008-07-15 21:03:57 -04002308 if ((mask & (MAY_READ | MAY_WRITE | MAY_EXEC)) == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002309 goto out;
2310 /* Is this sys_access() ? */
Eric Paris9cfcac82010-07-23 11:43:51 -04002311 if (mask & (MAY_ACCESS | MAY_CHDIR))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002312 goto force_lookup;
2313
2314 switch (inode->i_mode & S_IFMT) {
2315 case S_IFLNK:
2316 goto out;
2317 case S_IFREG:
2318 /* NFSv4 has atomic_open... */
2319 if (nfs_server_capable(inode, NFS_CAP_ATOMIC_OPEN)
Frank Filz7ee2cb72009-05-18 17:41:40 -04002320 && (mask & MAY_OPEN)
2321 && !(mask & MAY_EXEC))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002322 goto out;
2323 break;
2324 case S_IFDIR:
2325 /*
2326 * Optimize away all write operations, since the server
2327 * will check permissions when we perform the op.
2328 */
2329 if ((mask & MAY_WRITE) && !(mask & MAY_READ))
2330 goto out;
2331 }
2332
2333force_lookup:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002334 if (!NFS_PROTO(inode)->access)
2335 goto out_notsup;
2336
Trond Myklebust98a8e322008-03-12 12:25:28 -04002337 cred = rpc_lookup_cred();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002338 if (!IS_ERR(cred)) {
2339 res = nfs_do_access(inode, cred, mask);
2340 put_rpccred(cred);
2341 } else
2342 res = PTR_ERR(cred);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002343out:
Miklos Szeredif696a362008-07-31 13:41:58 +02002344 if (!res && (mask & MAY_EXEC) && !execute_ok(inode))
2345 res = -EACCES;
2346
Chuck Lever1e7cb3d2006-03-20 13:44:24 -05002347 dfprintk(VFS, "NFS: permission(%s/%ld), mask=0x%x, res=%d\n",
2348 inode->i_sb->s_id, inode->i_ino, mask, res);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002349 return res;
2350out_notsup:
2351 res = nfs_revalidate_inode(NFS_SERVER(inode), inode);
2352 if (res == 0)
Al Viro2830ba72011-06-20 19:16:29 -04002353 res = generic_permission(inode, mask);
Chuck Lever1e7cb3d2006-03-20 13:44:24 -05002354 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002355}
2356
2357/*
2358 * Local variables:
2359 * version-control: t
2360 * kept-new-versions: 5
2361 * End:
2362 */