Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/fs/nfs/dir.c |
| 3 | * |
| 4 | * Copyright (C) 1992 Rick Sladkey |
| 5 | * |
| 6 | * nfs directory handling functions |
| 7 | * |
| 8 | * 10 Apr 1996 Added silly rename for unlink --okir |
| 9 | * 28 Sep 1996 Improved directory cache --okir |
| 10 | * 23 Aug 1997 Claus Heine claus@momo.math.rwth-aachen.de |
| 11 | * Re-implemented silly rename for unlink, newly implemented |
| 12 | * silly rename for nfs_rename() following the suggestions |
| 13 | * of Olaf Kirch (okir) found in this file. |
| 14 | * Following Linus comments on my original hack, this version |
| 15 | * depends only on the dcache stuff and doesn't touch the inode |
| 16 | * layer (iput() and friends). |
| 17 | * 6 Jun 1999 Cache readdir lookups in the page cache. -DaveM |
| 18 | */ |
| 19 | |
Bryan Schumaker | ddda8e0 | 2012-07-30 16:05:23 -0400 | [diff] [blame] | 20 | #include <linux/module.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | #include <linux/time.h> |
| 22 | #include <linux/errno.h> |
| 23 | #include <linux/stat.h> |
| 24 | #include <linux/fcntl.h> |
| 25 | #include <linux/string.h> |
| 26 | #include <linux/kernel.h> |
| 27 | #include <linux/slab.h> |
| 28 | #include <linux/mm.h> |
| 29 | #include <linux/sunrpc/clnt.h> |
| 30 | #include <linux/nfs_fs.h> |
| 31 | #include <linux/nfs_mount.h> |
| 32 | #include <linux/pagemap.h> |
Chuck Lever | 873101b | 2006-08-22 20:06:23 -0400 | [diff] [blame] | 33 | #include <linux/pagevec.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | #include <linux/namei.h> |
David Howells | 54ceac4 | 2006-08-22 20:06:13 -0400 | [diff] [blame] | 35 | #include <linux/mount.h> |
Alexey Dobriyan | e8edc6e | 2007-05-21 01:22:52 +0400 | [diff] [blame] | 36 | #include <linux/sched.h> |
Catalin Marinas | 04e4bd1 | 2010-11-11 12:53:47 +0000 | [diff] [blame] | 37 | #include <linux/kmemleak.h> |
Aneesh Kumar K.V | 64c2ce8 | 2010-12-09 11:35:25 +0000 | [diff] [blame] | 38 | #include <linux/xattr.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | |
| 40 | #include "delegation.h" |
Chuck Lever | 91d5b47 | 2006-03-20 13:44:14 -0500 | [diff] [blame] | 41 | #include "iostat.h" |
Adrian Bunk | 4c30d56 | 2007-11-21 15:04:31 -0800 | [diff] [blame] | 42 | #include "internal.h" |
Trond Myklebust | cd9a1c0 | 2010-09-17 10:56:50 -0400 | [diff] [blame] | 43 | #include "fscache.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | /* #define NFS_DEBUG_VERBOSE 1 */ |
| 46 | |
| 47 | static int nfs_opendir(struct inode *, struct file *); |
Bryan Schumaker | 480c200 | 2011-03-23 14:48:29 -0400 | [diff] [blame] | 48 | static int nfs_closedir(struct inode *, struct file *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | static int nfs_readdir(struct file *, void *, filldir_t); |
Josef Bacik | 02c24a8 | 2011-07-16 20:44:56 -0400 | [diff] [blame] | 50 | static int nfs_fsync_dir(struct file *, loff_t, loff_t, int); |
Trond Myklebust | f0dd213 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 51 | static loff_t nfs_llseek_dir(struct file *, loff_t, int); |
Trond Myklebust | 11de3b1 | 2010-12-01 14:17:06 -0500 | [diff] [blame] | 52 | static void nfs_readdir_clear_array(struct page*); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | |
Arjan van de Ven | 4b6f5d2 | 2006-03-28 01:56:42 -0800 | [diff] [blame] | 54 | const struct file_operations nfs_dir_operations = { |
Trond Myklebust | f0dd213 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 55 | .llseek = nfs_llseek_dir, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | .read = generic_read_dir, |
| 57 | .readdir = nfs_readdir, |
| 58 | .open = nfs_opendir, |
Bryan Schumaker | 480c200 | 2011-03-23 14:48:29 -0400 | [diff] [blame] | 59 | .release = nfs_closedir, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | .fsync = nfs_fsync_dir, |
| 61 | }; |
| 62 | |
Trond Myklebust | 11de3b1 | 2010-12-01 14:17:06 -0500 | [diff] [blame] | 63 | const struct address_space_operations nfs_dir_aops = { |
| 64 | .freepage = nfs_readdir_clear_array, |
Bryan Schumaker | d1bacf9 | 2010-09-24 14:48:42 -0400 | [diff] [blame] | 65 | }; |
| 66 | |
Trond Myklebust | 0c03080 | 2011-07-30 12:45:35 -0400 | [diff] [blame] | 67 | static struct nfs_open_dir_context *alloc_nfs_open_dir_context(struct inode *dir, struct rpc_cred *cred) |
Bryan Schumaker | 480c200 | 2011-03-23 14:48:29 -0400 | [diff] [blame] | 68 | { |
| 69 | struct nfs_open_dir_context *ctx; |
| 70 | ctx = kmalloc(sizeof(*ctx), GFP_KERNEL); |
| 71 | if (ctx != NULL) { |
Bryan Schumaker | 8ef2ce3 | 2011-03-23 15:04:31 -0400 | [diff] [blame] | 72 | ctx->duped = 0; |
Trond Myklebust | 0c03080 | 2011-07-30 12:45:35 -0400 | [diff] [blame] | 73 | ctx->attr_gencount = NFS_I(dir)->attr_gencount; |
Bryan Schumaker | 480c200 | 2011-03-23 14:48:29 -0400 | [diff] [blame] | 74 | ctx->dir_cookie = 0; |
Bryan Schumaker | 8ef2ce3 | 2011-03-23 15:04:31 -0400 | [diff] [blame] | 75 | ctx->dup_cookie = 0; |
Bryan Schumaker | 480c200 | 2011-03-23 14:48:29 -0400 | [diff] [blame] | 76 | ctx->cred = get_rpccred(cred); |
Trond Myklebust | 0c03080 | 2011-07-30 12:45:35 -0400 | [diff] [blame] | 77 | return ctx; |
| 78 | } |
| 79 | return ERR_PTR(-ENOMEM); |
Bryan Schumaker | 480c200 | 2011-03-23 14:48:29 -0400 | [diff] [blame] | 80 | } |
| 81 | |
| 82 | static void put_nfs_open_dir_context(struct nfs_open_dir_context *ctx) |
| 83 | { |
| 84 | put_rpccred(ctx->cred); |
| 85 | kfree(ctx); |
| 86 | } |
| 87 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | /* |
| 89 | * Open file |
| 90 | */ |
| 91 | static int |
| 92 | nfs_opendir(struct inode *inode, struct file *filp) |
| 93 | { |
Bryan Schumaker | 480c200 | 2011-03-23 14:48:29 -0400 | [diff] [blame] | 94 | int res = 0; |
| 95 | struct nfs_open_dir_context *ctx; |
| 96 | struct rpc_cred *cred; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | |
Chuck Lever | 6da24bc | 2008-06-11 17:55:58 -0400 | [diff] [blame] | 98 | dfprintk(FILE, "NFS: open dir(%s/%s)\n", |
Chuck Lever | cc0dd2d | 2008-06-11 17:55:42 -0400 | [diff] [blame] | 99 | filp->f_path.dentry->d_parent->d_name.name, |
| 100 | filp->f_path.dentry->d_name.name); |
| 101 | |
| 102 | nfs_inc_stats(inode, NFSIOS_VFSOPEN); |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 103 | |
Bryan Schumaker | 480c200 | 2011-03-23 14:48:29 -0400 | [diff] [blame] | 104 | cred = rpc_lookup_cred(); |
| 105 | if (IS_ERR(cred)) |
| 106 | return PTR_ERR(cred); |
Trond Myklebust | 0c03080 | 2011-07-30 12:45:35 -0400 | [diff] [blame] | 107 | ctx = alloc_nfs_open_dir_context(inode, cred); |
Bryan Schumaker | 480c200 | 2011-03-23 14:48:29 -0400 | [diff] [blame] | 108 | if (IS_ERR(ctx)) { |
| 109 | res = PTR_ERR(ctx); |
| 110 | goto out; |
| 111 | } |
| 112 | filp->private_data = ctx; |
Neil Brown | f5a7367 | 2010-08-10 10:20:05 -0400 | [diff] [blame] | 113 | if (filp->f_path.dentry == filp->f_path.mnt->mnt_root) { |
| 114 | /* This is a mountpoint, so d_revalidate will never |
| 115 | * have been called, so we need to refresh the |
| 116 | * inode (for close-open consistency) ourselves. |
| 117 | */ |
| 118 | __nfs_revalidate_inode(NFS_SERVER(inode), inode); |
| 119 | } |
Bryan Schumaker | 480c200 | 2011-03-23 14:48:29 -0400 | [diff] [blame] | 120 | out: |
| 121 | put_rpccred(cred); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 122 | return res; |
| 123 | } |
| 124 | |
Bryan Schumaker | 480c200 | 2011-03-23 14:48:29 -0400 | [diff] [blame] | 125 | static int |
| 126 | nfs_closedir(struct inode *inode, struct file *filp) |
| 127 | { |
| 128 | put_nfs_open_dir_context(filp->private_data); |
| 129 | return 0; |
| 130 | } |
| 131 | |
Bryan Schumaker | d1bacf9 | 2010-09-24 14:48:42 -0400 | [diff] [blame] | 132 | struct nfs_cache_array_entry { |
| 133 | u64 cookie; |
| 134 | u64 ino; |
| 135 | struct qstr string; |
Trond Myklebust | 0b26a0b | 2010-11-20 14:26:44 -0500 | [diff] [blame] | 136 | unsigned char d_type; |
Bryan Schumaker | d1bacf9 | 2010-09-24 14:48:42 -0400 | [diff] [blame] | 137 | }; |
| 138 | |
| 139 | struct nfs_cache_array { |
Chuck Lever | 88b8e13 | 2012-03-01 17:00:23 -0500 | [diff] [blame] | 140 | int size; |
Bryan Schumaker | d1bacf9 | 2010-09-24 14:48:42 -0400 | [diff] [blame] | 141 | int eof_index; |
| 142 | u64 last_cookie; |
| 143 | struct nfs_cache_array_entry array[0]; |
| 144 | }; |
| 145 | |
Chuck Lever | 573c4e1 | 2010-12-14 14:58:11 +0000 | [diff] [blame] | 146 | typedef int (*decode_dirent_t)(struct xdr_stream *, struct nfs_entry *, int); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | typedef struct { |
| 148 | struct file *file; |
| 149 | struct page *page; |
| 150 | unsigned long page_index; |
Trond Myklebust | f0dd213 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 151 | u64 *dir_cookie; |
Trond Myklebust | 0aded70 | 2010-11-30 21:56:32 -0500 | [diff] [blame] | 152 | u64 last_cookie; |
Trond Myklebust | f0dd213 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 153 | loff_t current_index; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | decode_dirent_t decode; |
Bryan Schumaker | d1bacf9 | 2010-09-24 14:48:42 -0400 | [diff] [blame] | 155 | |
Neil Brown | 1f4eab7 | 2007-04-16 09:35:27 +1000 | [diff] [blame] | 156 | unsigned long timestamp; |
Trond Myklebust | 4704f0e | 2008-10-14 19:16:07 -0400 | [diff] [blame] | 157 | unsigned long gencount; |
Bryan Schumaker | d1bacf9 | 2010-09-24 14:48:42 -0400 | [diff] [blame] | 158 | unsigned int cache_entry_index; |
| 159 | unsigned int plus:1; |
| 160 | unsigned int eof:1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 161 | } nfs_readdir_descriptor_t; |
| 162 | |
Bryan Schumaker | d1bacf9 | 2010-09-24 14:48:42 -0400 | [diff] [blame] | 163 | /* |
| 164 | * The caller is responsible for calling nfs_readdir_release_array(page) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 165 | */ |
| 166 | static |
Bryan Schumaker | d1bacf9 | 2010-09-24 14:48:42 -0400 | [diff] [blame] | 167 | struct nfs_cache_array *nfs_readdir_get_array(struct page *page) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | { |
Trond Myklebust | 8cd51a0 | 2010-11-15 20:26:22 -0500 | [diff] [blame] | 169 | void *ptr; |
Bryan Schumaker | d1bacf9 | 2010-09-24 14:48:42 -0400 | [diff] [blame] | 170 | if (page == NULL) |
| 171 | return ERR_PTR(-EIO); |
Trond Myklebust | 8cd51a0 | 2010-11-15 20:26:22 -0500 | [diff] [blame] | 172 | ptr = kmap(page); |
| 173 | if (ptr == NULL) |
| 174 | return ERR_PTR(-ENOMEM); |
| 175 | return ptr; |
Bryan Schumaker | d1bacf9 | 2010-09-24 14:48:42 -0400 | [diff] [blame] | 176 | } |
| 177 | |
| 178 | static |
| 179 | void nfs_readdir_release_array(struct page *page) |
| 180 | { |
| 181 | kunmap(page); |
| 182 | } |
| 183 | |
| 184 | /* |
| 185 | * we are freeing strings created by nfs_add_to_readdir_array() |
| 186 | */ |
| 187 | static |
Trond Myklebust | 11de3b1 | 2010-12-01 14:17:06 -0500 | [diff] [blame] | 188 | void nfs_readdir_clear_array(struct page *page) |
Bryan Schumaker | d1bacf9 | 2010-09-24 14:48:42 -0400 | [diff] [blame] | 189 | { |
Trond Myklebust | 11de3b1 | 2010-12-01 14:17:06 -0500 | [diff] [blame] | 190 | struct nfs_cache_array *array; |
Bryan Schumaker | d1bacf9 | 2010-09-24 14:48:42 -0400 | [diff] [blame] | 191 | int i; |
Trond Myklebust | 8cd51a0 | 2010-11-15 20:26:22 -0500 | [diff] [blame] | 192 | |
Cong Wang | 2b86ce2 | 2011-11-25 23:14:33 +0800 | [diff] [blame] | 193 | array = kmap_atomic(page); |
Bryan Schumaker | d1bacf9 | 2010-09-24 14:48:42 -0400 | [diff] [blame] | 194 | for (i = 0; i < array->size; i++) |
| 195 | kfree(array->array[i].string.name); |
Cong Wang | 2b86ce2 | 2011-11-25 23:14:33 +0800 | [diff] [blame] | 196 | kunmap_atomic(array); |
Bryan Schumaker | d1bacf9 | 2010-09-24 14:48:42 -0400 | [diff] [blame] | 197 | } |
| 198 | |
| 199 | /* |
| 200 | * the caller is responsible for freeing qstr.name |
| 201 | * when called by nfs_readdir_add_to_array, the strings will be freed in |
| 202 | * nfs_clear_readdir_array() |
| 203 | */ |
| 204 | static |
Trond Myklebust | 4a201d6 | 2010-10-23 14:53:23 -0400 | [diff] [blame] | 205 | int nfs_readdir_make_qstr(struct qstr *string, const char *name, unsigned int len) |
Bryan Schumaker | d1bacf9 | 2010-09-24 14:48:42 -0400 | [diff] [blame] | 206 | { |
| 207 | string->len = len; |
| 208 | string->name = kmemdup(name, len, GFP_KERNEL); |
Trond Myklebust | 4a201d6 | 2010-10-23 14:53:23 -0400 | [diff] [blame] | 209 | if (string->name == NULL) |
| 210 | return -ENOMEM; |
Catalin Marinas | 04e4bd1 | 2010-11-11 12:53:47 +0000 | [diff] [blame] | 211 | /* |
| 212 | * Avoid a kmemleak false positive. The pointer to the name is stored |
| 213 | * in a page cache page which kmemleak does not scan. |
| 214 | */ |
| 215 | kmemleak_not_leak(string->name); |
Trond Myklebust | 4a201d6 | 2010-10-23 14:53:23 -0400 | [diff] [blame] | 216 | string->hash = full_name_hash(name, len); |
| 217 | return 0; |
Bryan Schumaker | d1bacf9 | 2010-09-24 14:48:42 -0400 | [diff] [blame] | 218 | } |
| 219 | |
| 220 | static |
| 221 | int nfs_readdir_add_to_array(struct nfs_entry *entry, struct page *page) |
| 222 | { |
| 223 | struct nfs_cache_array *array = nfs_readdir_get_array(page); |
Trond Myklebust | 4a201d6 | 2010-10-23 14:53:23 -0400 | [diff] [blame] | 224 | struct nfs_cache_array_entry *cache_entry; |
| 225 | int ret; |
| 226 | |
Bryan Schumaker | d1bacf9 | 2010-09-24 14:48:42 -0400 | [diff] [blame] | 227 | if (IS_ERR(array)) |
| 228 | return PTR_ERR(array); |
Bryan Schumaker | d1bacf9 | 2010-09-24 14:48:42 -0400 | [diff] [blame] | 229 | |
Trond Myklebust | 4a201d6 | 2010-10-23 14:53:23 -0400 | [diff] [blame] | 230 | cache_entry = &array->array[array->size]; |
Trond Myklebust | 3020093f | 2010-11-20 15:18:22 -0500 | [diff] [blame] | 231 | |
| 232 | /* Check that this entry lies within the page bounds */ |
| 233 | ret = -ENOSPC; |
| 234 | if ((char *)&cache_entry[1] - (char *)page_address(page) > PAGE_SIZE) |
| 235 | goto out; |
| 236 | |
Trond Myklebust | 4a201d6 | 2010-10-23 14:53:23 -0400 | [diff] [blame] | 237 | cache_entry->cookie = entry->prev_cookie; |
| 238 | cache_entry->ino = entry->ino; |
Trond Myklebust | 0b26a0b | 2010-11-20 14:26:44 -0500 | [diff] [blame] | 239 | cache_entry->d_type = entry->d_type; |
Trond Myklebust | 4a201d6 | 2010-10-23 14:53:23 -0400 | [diff] [blame] | 240 | ret = nfs_readdir_make_qstr(&cache_entry->string, entry->name, entry->len); |
| 241 | if (ret) |
| 242 | goto out; |
Bryan Schumaker | d1bacf9 | 2010-09-24 14:48:42 -0400 | [diff] [blame] | 243 | array->last_cookie = entry->cookie; |
Trond Myklebust | 8cd51a0 | 2010-11-15 20:26:22 -0500 | [diff] [blame] | 244 | array->size++; |
Trond Myklebust | 47c716c | 2010-12-07 12:44:56 -0500 | [diff] [blame] | 245 | if (entry->eof != 0) |
Bryan Schumaker | d1bacf9 | 2010-09-24 14:48:42 -0400 | [diff] [blame] | 246 | array->eof_index = array->size; |
Trond Myklebust | 4a201d6 | 2010-10-23 14:53:23 -0400 | [diff] [blame] | 247 | out: |
Bryan Schumaker | d1bacf9 | 2010-09-24 14:48:42 -0400 | [diff] [blame] | 248 | nfs_readdir_release_array(page); |
Trond Myklebust | 4a201d6 | 2010-10-23 14:53:23 -0400 | [diff] [blame] | 249 | return ret; |
Bryan Schumaker | d1bacf9 | 2010-09-24 14:48:42 -0400 | [diff] [blame] | 250 | } |
| 251 | |
| 252 | static |
| 253 | int nfs_readdir_search_for_pos(struct nfs_cache_array *array, nfs_readdir_descriptor_t *desc) |
| 254 | { |
| 255 | loff_t diff = desc->file->f_pos - desc->current_index; |
| 256 | unsigned int index; |
| 257 | |
| 258 | if (diff < 0) |
| 259 | goto out_eof; |
| 260 | if (diff >= array->size) { |
Trond Myklebust | 8cd51a0 | 2010-11-15 20:26:22 -0500 | [diff] [blame] | 261 | if (array->eof_index >= 0) |
Bryan Schumaker | d1bacf9 | 2010-09-24 14:48:42 -0400 | [diff] [blame] | 262 | goto out_eof; |
Bryan Schumaker | d1bacf9 | 2010-09-24 14:48:42 -0400 | [diff] [blame] | 263 | return -EAGAIN; |
| 264 | } |
| 265 | |
| 266 | index = (unsigned int)diff; |
| 267 | *desc->dir_cookie = array->array[index].cookie; |
| 268 | desc->cache_entry_index = index; |
Bryan Schumaker | d1bacf9 | 2010-09-24 14:48:42 -0400 | [diff] [blame] | 269 | return 0; |
| 270 | out_eof: |
| 271 | desc->eof = 1; |
| 272 | return -EBADCOOKIE; |
| 273 | } |
| 274 | |
| 275 | static |
| 276 | int nfs_readdir_search_for_cookie(struct nfs_cache_array *array, nfs_readdir_descriptor_t *desc) |
| 277 | { |
| 278 | int i; |
Bryan Schumaker | 8ef2ce3 | 2011-03-23 15:04:31 -0400 | [diff] [blame] | 279 | loff_t new_pos; |
Bryan Schumaker | d1bacf9 | 2010-09-24 14:48:42 -0400 | [diff] [blame] | 280 | int status = -EAGAIN; |
| 281 | |
| 282 | for (i = 0; i < array->size; i++) { |
Bryan Schumaker | d1bacf9 | 2010-09-24 14:48:42 -0400 | [diff] [blame] | 283 | if (array->array[i].cookie == *desc->dir_cookie) { |
Trond Myklebust | 0c03080 | 2011-07-30 12:45:35 -0400 | [diff] [blame] | 284 | struct nfs_inode *nfsi = NFS_I(desc->file->f_path.dentry->d_inode); |
| 285 | struct nfs_open_dir_context *ctx = desc->file->private_data; |
| 286 | |
Bryan Schumaker | 8ef2ce3 | 2011-03-23 15:04:31 -0400 | [diff] [blame] | 287 | new_pos = desc->current_index + i; |
Trond Myklebust | 0c03080 | 2011-07-30 12:45:35 -0400 | [diff] [blame] | 288 | if (ctx->attr_gencount != nfsi->attr_gencount |
| 289 | || (nfsi->cache_validity & (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA))) { |
| 290 | ctx->duped = 0; |
| 291 | ctx->attr_gencount = nfsi->attr_gencount; |
| 292 | } else if (new_pos < desc->file->f_pos) { |
| 293 | if (ctx->duped > 0 |
| 294 | && ctx->dup_cookie == *desc->dir_cookie) { |
| 295 | if (printk_ratelimit()) { |
| 296 | pr_notice("NFS: directory %s/%s contains a readdir loop." |
| 297 | "Please contact your server vendor. " |
Bryan Schumaker | 374e4e3 | 2011-07-29 11:49:06 -0400 | [diff] [blame] | 298 | "The file: %s has duplicate cookie %llu\n", |
Trond Myklebust | 0c03080 | 2011-07-30 12:45:35 -0400 | [diff] [blame] | 299 | desc->file->f_dentry->d_parent->d_name.name, |
| 300 | desc->file->f_dentry->d_name.name, |
Bryan Schumaker | 374e4e3 | 2011-07-29 11:49:06 -0400 | [diff] [blame] | 301 | array->array[i].string.name, |
Trond Myklebust | 0c03080 | 2011-07-30 12:45:35 -0400 | [diff] [blame] | 302 | *desc->dir_cookie); |
| 303 | } |
| 304 | status = -ELOOP; |
| 305 | goto out; |
| 306 | } |
Bryan Schumaker | 8ef2ce3 | 2011-03-23 15:04:31 -0400 | [diff] [blame] | 307 | ctx->dup_cookie = *desc->dir_cookie; |
Trond Myklebust | 0c03080 | 2011-07-30 12:45:35 -0400 | [diff] [blame] | 308 | ctx->duped = -1; |
Bryan Schumaker | 8ef2ce3 | 2011-03-23 15:04:31 -0400 | [diff] [blame] | 309 | } |
| 310 | desc->file->f_pos = new_pos; |
Bryan Schumaker | d1bacf9 | 2010-09-24 14:48:42 -0400 | [diff] [blame] | 311 | desc->cache_entry_index = i; |
Trond Myklebust | 47c716c | 2010-12-07 12:44:56 -0500 | [diff] [blame] | 312 | return 0; |
Bryan Schumaker | d1bacf9 | 2010-09-24 14:48:42 -0400 | [diff] [blame] | 313 | } |
| 314 | } |
Trond Myklebust | 47c716c | 2010-12-07 12:44:56 -0500 | [diff] [blame] | 315 | if (array->eof_index >= 0) { |
Trond Myklebust | 8cd51a0 | 2010-11-15 20:26:22 -0500 | [diff] [blame] | 316 | status = -EBADCOOKIE; |
Trond Myklebust | 18fb5fe | 2010-12-07 12:41:58 -0500 | [diff] [blame] | 317 | if (*desc->dir_cookie == array->last_cookie) |
| 318 | desc->eof = 1; |
Trond Myklebust | 8cd51a0 | 2010-11-15 20:26:22 -0500 | [diff] [blame] | 319 | } |
Trond Myklebust | 0c03080 | 2011-07-30 12:45:35 -0400 | [diff] [blame] | 320 | out: |
Bryan Schumaker | d1bacf9 | 2010-09-24 14:48:42 -0400 | [diff] [blame] | 321 | return status; |
| 322 | } |
| 323 | |
| 324 | static |
| 325 | int nfs_readdir_search_array(nfs_readdir_descriptor_t *desc) |
| 326 | { |
| 327 | struct nfs_cache_array *array; |
Trond Myklebust | 47c716c | 2010-12-07 12:44:56 -0500 | [diff] [blame] | 328 | int status; |
Bryan Schumaker | d1bacf9 | 2010-09-24 14:48:42 -0400 | [diff] [blame] | 329 | |
| 330 | array = nfs_readdir_get_array(desc->page); |
| 331 | if (IS_ERR(array)) { |
| 332 | status = PTR_ERR(array); |
| 333 | goto out; |
| 334 | } |
| 335 | |
| 336 | if (*desc->dir_cookie == 0) |
| 337 | status = nfs_readdir_search_for_pos(array, desc); |
| 338 | else |
| 339 | status = nfs_readdir_search_for_cookie(array, desc); |
| 340 | |
Trond Myklebust | 47c716c | 2010-12-07 12:44:56 -0500 | [diff] [blame] | 341 | if (status == -EAGAIN) { |
Trond Myklebust | 0aded70 | 2010-11-30 21:56:32 -0500 | [diff] [blame] | 342 | desc->last_cookie = array->last_cookie; |
Trond Myklebust | e47c085 | 2011-03-23 08:43:09 -0400 | [diff] [blame] | 343 | desc->current_index += array->size; |
Trond Myklebust | 47c716c | 2010-12-07 12:44:56 -0500 | [diff] [blame] | 344 | desc->page_index++; |
| 345 | } |
Bryan Schumaker | d1bacf9 | 2010-09-24 14:48:42 -0400 | [diff] [blame] | 346 | nfs_readdir_release_array(desc->page); |
| 347 | out: |
| 348 | return status; |
| 349 | } |
| 350 | |
| 351 | /* Fill a page with xdr information before transferring to the cache page */ |
| 352 | static |
Bryan Schumaker | 56e4ebf | 2010-10-20 15:44:37 -0400 | [diff] [blame] | 353 | int nfs_readdir_xdr_filler(struct page **pages, nfs_readdir_descriptor_t *desc, |
Bryan Schumaker | d1bacf9 | 2010-09-24 14:48:42 -0400 | [diff] [blame] | 354 | struct nfs_entry *entry, struct file *file, struct inode *inode) |
| 355 | { |
Bryan Schumaker | 480c200 | 2011-03-23 14:48:29 -0400 | [diff] [blame] | 356 | struct nfs_open_dir_context *ctx = file->private_data; |
| 357 | struct rpc_cred *cred = ctx->cred; |
Trond Myklebust | 4704f0e | 2008-10-14 19:16:07 -0400 | [diff] [blame] | 358 | unsigned long timestamp, gencount; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 359 | int error; |
| 360 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 361 | again: |
| 362 | timestamp = jiffies; |
Trond Myklebust | 4704f0e | 2008-10-14 19:16:07 -0400 | [diff] [blame] | 363 | gencount = nfs_inc_attr_generation_counter(); |
Bryan Schumaker | 56e4ebf | 2010-10-20 15:44:37 -0400 | [diff] [blame] | 364 | error = NFS_PROTO(inode)->readdir(file->f_path.dentry, cred, entry->cookie, pages, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 365 | NFS_SERVER(inode)->dtsize, desc->plus); |
| 366 | if (error < 0) { |
| 367 | /* We requested READDIRPLUS, but the server doesn't grok it */ |
| 368 | if (error == -ENOTSUPP && desc->plus) { |
| 369 | NFS_SERVER(inode)->caps &= ~NFS_CAP_READDIRPLUS; |
Benny Halevy | 3a10c30 | 2008-01-23 08:58:59 +0200 | [diff] [blame] | 370 | clear_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(inode)->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 371 | desc->plus = 0; |
| 372 | goto again; |
| 373 | } |
| 374 | goto error; |
| 375 | } |
Neil Brown | 1f4eab7 | 2007-04-16 09:35:27 +1000 | [diff] [blame] | 376 | desc->timestamp = timestamp; |
Trond Myklebust | 4704f0e | 2008-10-14 19:16:07 -0400 | [diff] [blame] | 377 | desc->gencount = gencount; |
Bryan Schumaker | d1bacf9 | 2010-09-24 14:48:42 -0400 | [diff] [blame] | 378 | error: |
| 379 | return error; |
| 380 | } |
| 381 | |
Chuck Lever | 573c4e1 | 2010-12-14 14:58:11 +0000 | [diff] [blame] | 382 | static int xdr_decode(nfs_readdir_descriptor_t *desc, |
| 383 | struct nfs_entry *entry, struct xdr_stream *xdr) |
Bryan Schumaker | d1bacf9 | 2010-09-24 14:48:42 -0400 | [diff] [blame] | 384 | { |
Chuck Lever | 573c4e1 | 2010-12-14 14:58:11 +0000 | [diff] [blame] | 385 | int error; |
Bryan Schumaker | d1bacf9 | 2010-09-24 14:48:42 -0400 | [diff] [blame] | 386 | |
Chuck Lever | 573c4e1 | 2010-12-14 14:58:11 +0000 | [diff] [blame] | 387 | error = desc->decode(xdr, entry, desc->plus); |
| 388 | if (error) |
| 389 | return error; |
Bryan Schumaker | d1bacf9 | 2010-09-24 14:48:42 -0400 | [diff] [blame] | 390 | entry->fattr->time_start = desc->timestamp; |
| 391 | entry->fattr->gencount = desc->gencount; |
| 392 | return 0; |
| 393 | } |
| 394 | |
Bryan Schumaker | d39ab9d | 2010-09-24 18:50:01 -0400 | [diff] [blame] | 395 | static |
| 396 | int nfs_same_file(struct dentry *dentry, struct nfs_entry *entry) |
| 397 | { |
Bryan Schumaker | d39ab9d | 2010-09-24 18:50:01 -0400 | [diff] [blame] | 398 | if (dentry->d_inode == NULL) |
| 399 | goto different; |
Trond Myklebust | 37a09f0 | 2010-11-30 12:42:34 -0500 | [diff] [blame] | 400 | if (nfs_compare_fh(entry->fh, NFS_FH(dentry->d_inode)) != 0) |
Bryan Schumaker | d39ab9d | 2010-09-24 18:50:01 -0400 | [diff] [blame] | 401 | goto different; |
| 402 | return 1; |
| 403 | different: |
| 404 | return 0; |
| 405 | } |
| 406 | |
| 407 | static |
Trond Myklebust | d69ee9b | 2012-05-01 17:37:59 -0400 | [diff] [blame] | 408 | bool nfs_use_readdirplus(struct inode *dir, struct file *filp) |
| 409 | { |
| 410 | if (!nfs_server_capable(dir, NFS_CAP_READDIRPLUS)) |
| 411 | return false; |
| 412 | if (test_and_clear_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(dir)->flags)) |
| 413 | return true; |
| 414 | if (filp->f_pos == 0) |
| 415 | return true; |
| 416 | return false; |
| 417 | } |
| 418 | |
| 419 | /* |
| 420 | * This function is called by the lookup code to request the use of |
| 421 | * readdirplus to accelerate any future lookups in the same |
| 422 | * directory. |
| 423 | */ |
| 424 | static |
| 425 | void nfs_advise_use_readdirplus(struct inode *dir) |
| 426 | { |
| 427 | set_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(dir)->flags); |
| 428 | } |
| 429 | |
| 430 | static |
Bryan Schumaker | d39ab9d | 2010-09-24 18:50:01 -0400 | [diff] [blame] | 431 | void nfs_prime_dcache(struct dentry *parent, struct nfs_entry *entry) |
| 432 | { |
Linus Torvalds | 26fe575 | 2012-05-10 13:14:12 -0700 | [diff] [blame] | 433 | struct qstr filename = QSTR_INIT(entry->name, entry->len); |
Trond Myklebust | 4a201d6 | 2010-10-23 14:53:23 -0400 | [diff] [blame] | 434 | struct dentry *dentry; |
| 435 | struct dentry *alias; |
Bryan Schumaker | d39ab9d | 2010-09-24 18:50:01 -0400 | [diff] [blame] | 436 | struct inode *dir = parent->d_inode; |
| 437 | struct inode *inode; |
| 438 | |
Trond Myklebust | 4a201d6 | 2010-10-23 14:53:23 -0400 | [diff] [blame] | 439 | if (filename.name[0] == '.') { |
| 440 | if (filename.len == 1) |
| 441 | return; |
| 442 | if (filename.len == 2 && filename.name[1] == '.') |
| 443 | return; |
| 444 | } |
| 445 | filename.hash = full_name_hash(filename.name, filename.len); |
Bryan Schumaker | d39ab9d | 2010-09-24 18:50:01 -0400 | [diff] [blame] | 446 | |
Trond Myklebust | 4a201d6 | 2010-10-23 14:53:23 -0400 | [diff] [blame] | 447 | dentry = d_lookup(parent, &filename); |
Bryan Schumaker | d39ab9d | 2010-09-24 18:50:01 -0400 | [diff] [blame] | 448 | if (dentry != NULL) { |
| 449 | if (nfs_same_file(dentry, entry)) { |
| 450 | nfs_refresh_inode(dentry->d_inode, entry->fattr); |
| 451 | goto out; |
| 452 | } else { |
| 453 | d_drop(dentry); |
| 454 | dput(dentry); |
| 455 | } |
| 456 | } |
| 457 | |
| 458 | dentry = d_alloc(parent, &filename); |
Trond Myklebust | 4a201d6 | 2010-10-23 14:53:23 -0400 | [diff] [blame] | 459 | if (dentry == NULL) |
| 460 | return; |
| 461 | |
Bryan Schumaker | d39ab9d | 2010-09-24 18:50:01 -0400 | [diff] [blame] | 462 | inode = nfs_fhget(dentry->d_sb, entry->fh, entry->fattr); |
| 463 | if (IS_ERR(inode)) |
| 464 | goto out; |
| 465 | |
| 466 | alias = d_materialise_unique(dentry, inode); |
| 467 | if (IS_ERR(alias)) |
| 468 | goto out; |
| 469 | else if (alias) { |
| 470 | nfs_set_verifier(alias, nfs_save_change_attribute(dir)); |
| 471 | dput(alias); |
| 472 | } else |
| 473 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
| 474 | |
| 475 | out: |
| 476 | dput(dentry); |
Bryan Schumaker | d39ab9d | 2010-09-24 18:50:01 -0400 | [diff] [blame] | 477 | } |
| 478 | |
Bryan Schumaker | d1bacf9 | 2010-09-24 14:48:42 -0400 | [diff] [blame] | 479 | /* Perform conversion from xdr to cache array */ |
| 480 | static |
Trond Myklebust | 8cd51a0 | 2010-11-15 20:26:22 -0500 | [diff] [blame] | 481 | int nfs_readdir_page_filler(nfs_readdir_descriptor_t *desc, struct nfs_entry *entry, |
Trond Myklebust | 6650239 | 2011-01-08 17:45:38 -0500 | [diff] [blame] | 482 | struct page **xdr_pages, struct page *page, unsigned int buflen) |
Bryan Schumaker | d1bacf9 | 2010-09-24 14:48:42 -0400 | [diff] [blame] | 483 | { |
Bryan Schumaker | babddc7 | 2010-10-20 15:44:29 -0400 | [diff] [blame] | 484 | struct xdr_stream stream; |
Benny Halevy | f7da7a1 | 2011-05-19 14:16:47 -0400 | [diff] [blame] | 485 | struct xdr_buf buf; |
Trond Myklebust | 6650239 | 2011-01-08 17:45:38 -0500 | [diff] [blame] | 486 | struct page *scratch; |
Bryan Schumaker | 9942438 | 2010-10-21 16:33:16 -0400 | [diff] [blame] | 487 | struct nfs_cache_array *array; |
Trond Myklebust | 5c34685 | 2010-11-20 12:43:45 -0500 | [diff] [blame] | 488 | unsigned int count = 0; |
| 489 | int status; |
Bryan Schumaker | babddc7 | 2010-10-20 15:44:29 -0400 | [diff] [blame] | 490 | |
Trond Myklebust | 6650239 | 2011-01-08 17:45:38 -0500 | [diff] [blame] | 491 | scratch = alloc_page(GFP_KERNEL); |
| 492 | if (scratch == NULL) |
| 493 | return -ENOMEM; |
Bryan Schumaker | babddc7 | 2010-10-20 15:44:29 -0400 | [diff] [blame] | 494 | |
Benny Halevy | f7da7a1 | 2011-05-19 14:16:47 -0400 | [diff] [blame] | 495 | xdr_init_decode_pages(&stream, &buf, xdr_pages, buflen); |
Trond Myklebust | 6650239 | 2011-01-08 17:45:38 -0500 | [diff] [blame] | 496 | xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE); |
Bryan Schumaker | 9942438 | 2010-10-21 16:33:16 -0400 | [diff] [blame] | 497 | |
| 498 | do { |
| 499 | status = xdr_decode(desc, entry, &stream); |
Trond Myklebust | 8cd51a0 | 2010-11-15 20:26:22 -0500 | [diff] [blame] | 500 | if (status != 0) { |
| 501 | if (status == -EAGAIN) |
| 502 | status = 0; |
Bryan Schumaker | 9942438 | 2010-10-21 16:33:16 -0400 | [diff] [blame] | 503 | break; |
Trond Myklebust | 8cd51a0 | 2010-11-15 20:26:22 -0500 | [diff] [blame] | 504 | } |
Bryan Schumaker | 9942438 | 2010-10-21 16:33:16 -0400 | [diff] [blame] | 505 | |
Trond Myklebust | 5c34685 | 2010-11-20 12:43:45 -0500 | [diff] [blame] | 506 | count++; |
| 507 | |
Trond Myklebust | 47c716c | 2010-12-07 12:44:56 -0500 | [diff] [blame] | 508 | if (desc->plus != 0) |
Bryan Schumaker | d39ab9d | 2010-09-24 18:50:01 -0400 | [diff] [blame] | 509 | nfs_prime_dcache(desc->file->f_path.dentry, entry); |
Trond Myklebust | 8cd51a0 | 2010-11-15 20:26:22 -0500 | [diff] [blame] | 510 | |
| 511 | status = nfs_readdir_add_to_array(entry, page); |
| 512 | if (status != 0) |
| 513 | break; |
Bryan Schumaker | 9942438 | 2010-10-21 16:33:16 -0400 | [diff] [blame] | 514 | } while (!entry->eof); |
| 515 | |
Trond Myklebust | 47c716c | 2010-12-07 12:44:56 -0500 | [diff] [blame] | 516 | if (count == 0 || (status == -EBADCOOKIE && entry->eof != 0)) { |
Bryan Schumaker | 9942438 | 2010-10-21 16:33:16 -0400 | [diff] [blame] | 517 | array = nfs_readdir_get_array(page); |
Trond Myklebust | 8cd51a0 | 2010-11-15 20:26:22 -0500 | [diff] [blame] | 518 | if (!IS_ERR(array)) { |
| 519 | array->eof_index = array->size; |
| 520 | status = 0; |
| 521 | nfs_readdir_release_array(page); |
Trond Myklebust | 5c34685 | 2010-11-20 12:43:45 -0500 | [diff] [blame] | 522 | } else |
| 523 | status = PTR_ERR(array); |
Bryan Schumaker | d1bacf9 | 2010-09-24 14:48:42 -0400 | [diff] [blame] | 524 | } |
Trond Myklebust | 6650239 | 2011-01-08 17:45:38 -0500 | [diff] [blame] | 525 | |
| 526 | put_page(scratch); |
Trond Myklebust | 8cd51a0 | 2010-11-15 20:26:22 -0500 | [diff] [blame] | 527 | return status; |
Bryan Schumaker | 56e4ebf | 2010-10-20 15:44:37 -0400 | [diff] [blame] | 528 | } |
| 529 | |
| 530 | static |
| 531 | void nfs_readdir_free_pagearray(struct page **pages, unsigned int npages) |
| 532 | { |
| 533 | unsigned int i; |
| 534 | for (i = 0; i < npages; i++) |
| 535 | put_page(pages[i]); |
| 536 | } |
| 537 | |
| 538 | static |
| 539 | void nfs_readdir_free_large_page(void *ptr, struct page **pages, |
| 540 | unsigned int npages) |
| 541 | { |
Bryan Schumaker | 56e4ebf | 2010-10-20 15:44:37 -0400 | [diff] [blame] | 542 | nfs_readdir_free_pagearray(pages, npages); |
| 543 | } |
| 544 | |
| 545 | /* |
| 546 | * nfs_readdir_large_page will allocate pages that must be freed with a call |
| 547 | * to nfs_readdir_free_large_page |
| 548 | */ |
| 549 | static |
Trond Myklebust | 6650239 | 2011-01-08 17:45:38 -0500 | [diff] [blame] | 550 | int nfs_readdir_large_page(struct page **pages, unsigned int npages) |
Bryan Schumaker | 56e4ebf | 2010-10-20 15:44:37 -0400 | [diff] [blame] | 551 | { |
Bryan Schumaker | 56e4ebf | 2010-10-20 15:44:37 -0400 | [diff] [blame] | 552 | unsigned int i; |
| 553 | |
| 554 | for (i = 0; i < npages; i++) { |
| 555 | struct page *page = alloc_page(GFP_KERNEL); |
| 556 | if (page == NULL) |
| 557 | goto out_freepages; |
| 558 | pages[i] = page; |
| 559 | } |
Trond Myklebust | 6650239 | 2011-01-08 17:45:38 -0500 | [diff] [blame] | 560 | return 0; |
Bryan Schumaker | 56e4ebf | 2010-10-20 15:44:37 -0400 | [diff] [blame] | 561 | |
Bryan Schumaker | 56e4ebf | 2010-10-20 15:44:37 -0400 | [diff] [blame] | 562 | out_freepages: |
| 563 | nfs_readdir_free_pagearray(pages, i); |
Trond Myklebust | 6650239 | 2011-01-08 17:45:38 -0500 | [diff] [blame] | 564 | return -ENOMEM; |
Bryan Schumaker | d1bacf9 | 2010-09-24 14:48:42 -0400 | [diff] [blame] | 565 | } |
| 566 | |
| 567 | static |
| 568 | int nfs_readdir_xdr_to_array(nfs_readdir_descriptor_t *desc, struct page *page, struct inode *inode) |
| 569 | { |
Bryan Schumaker | 56e4ebf | 2010-10-20 15:44:37 -0400 | [diff] [blame] | 570 | struct page *pages[NFS_MAX_READDIR_PAGES]; |
| 571 | void *pages_ptr = NULL; |
Bryan Schumaker | d1bacf9 | 2010-09-24 14:48:42 -0400 | [diff] [blame] | 572 | struct nfs_entry entry; |
| 573 | struct file *file = desc->file; |
| 574 | struct nfs_cache_array *array; |
Trond Myklebust | 8cd51a0 | 2010-11-15 20:26:22 -0500 | [diff] [blame] | 575 | int status = -ENOMEM; |
Bryan Schumaker | 56e4ebf | 2010-10-20 15:44:37 -0400 | [diff] [blame] | 576 | unsigned int array_size = ARRAY_SIZE(pages); |
Bryan Schumaker | d1bacf9 | 2010-09-24 14:48:42 -0400 | [diff] [blame] | 577 | |
| 578 | entry.prev_cookie = 0; |
Trond Myklebust | 0aded70 | 2010-11-30 21:56:32 -0500 | [diff] [blame] | 579 | entry.cookie = desc->last_cookie; |
Bryan Schumaker | d1bacf9 | 2010-09-24 14:48:42 -0400 | [diff] [blame] | 580 | entry.eof = 0; |
| 581 | entry.fh = nfs_alloc_fhandle(); |
| 582 | entry.fattr = nfs_alloc_fattr(); |
Chuck Lever | 573c4e1 | 2010-12-14 14:58:11 +0000 | [diff] [blame] | 583 | entry.server = NFS_SERVER(inode); |
Bryan Schumaker | d1bacf9 | 2010-09-24 14:48:42 -0400 | [diff] [blame] | 584 | if (entry.fh == NULL || entry.fattr == NULL) |
| 585 | goto out; |
| 586 | |
| 587 | array = nfs_readdir_get_array(page); |
Trond Myklebust | 8cd51a0 | 2010-11-15 20:26:22 -0500 | [diff] [blame] | 588 | if (IS_ERR(array)) { |
| 589 | status = PTR_ERR(array); |
| 590 | goto out; |
| 591 | } |
Bryan Schumaker | d1bacf9 | 2010-09-24 14:48:42 -0400 | [diff] [blame] | 592 | memset(array, 0, sizeof(struct nfs_cache_array)); |
| 593 | array->eof_index = -1; |
| 594 | |
Trond Myklebust | 6650239 | 2011-01-08 17:45:38 -0500 | [diff] [blame] | 595 | status = nfs_readdir_large_page(pages, array_size); |
| 596 | if (status < 0) |
Bryan Schumaker | d1bacf9 | 2010-09-24 14:48:42 -0400 | [diff] [blame] | 597 | goto out_release_array; |
| 598 | do { |
Trond Myklebust | ac39612 | 2010-11-15 20:26:22 -0500 | [diff] [blame] | 599 | unsigned int pglen; |
Bryan Schumaker | 56e4ebf | 2010-10-20 15:44:37 -0400 | [diff] [blame] | 600 | status = nfs_readdir_xdr_filler(pages, desc, &entry, file, inode); |
Bryan Schumaker | babddc7 | 2010-10-20 15:44:29 -0400 | [diff] [blame] | 601 | |
Bryan Schumaker | d1bacf9 | 2010-09-24 14:48:42 -0400 | [diff] [blame] | 602 | if (status < 0) |
| 603 | break; |
Trond Myklebust | ac39612 | 2010-11-15 20:26:22 -0500 | [diff] [blame] | 604 | pglen = status; |
Trond Myklebust | 6650239 | 2011-01-08 17:45:38 -0500 | [diff] [blame] | 605 | status = nfs_readdir_page_filler(desc, &entry, pages, page, pglen); |
Trond Myklebust | 8cd51a0 | 2010-11-15 20:26:22 -0500 | [diff] [blame] | 606 | if (status < 0) { |
| 607 | if (status == -ENOSPC) |
| 608 | status = 0; |
| 609 | break; |
| 610 | } |
| 611 | } while (array->eof_index < 0); |
Bryan Schumaker | d1bacf9 | 2010-09-24 14:48:42 -0400 | [diff] [blame] | 612 | |
Bryan Schumaker | 56e4ebf | 2010-10-20 15:44:37 -0400 | [diff] [blame] | 613 | nfs_readdir_free_large_page(pages_ptr, pages, array_size); |
Bryan Schumaker | d1bacf9 | 2010-09-24 14:48:42 -0400 | [diff] [blame] | 614 | out_release_array: |
| 615 | nfs_readdir_release_array(page); |
| 616 | out: |
| 617 | nfs_free_fattr(entry.fattr); |
| 618 | nfs_free_fhandle(entry.fh); |
| 619 | return status; |
| 620 | } |
| 621 | |
| 622 | /* |
| 623 | * Now we cache directories properly, by converting xdr information |
| 624 | * to an array that can be used for lookups later. This results in |
| 625 | * fewer cache pages, since we can store more information on each page. |
| 626 | * We only need to convert from xdr once so future lookups are much simpler |
| 627 | */ |
| 628 | static |
| 629 | int nfs_readdir_filler(nfs_readdir_descriptor_t *desc, struct page* page) |
| 630 | { |
| 631 | struct inode *inode = desc->file->f_path.dentry->d_inode; |
Trond Myklebust | 8cd51a0 | 2010-11-15 20:26:22 -0500 | [diff] [blame] | 632 | int ret; |
Bryan Schumaker | d1bacf9 | 2010-09-24 14:48:42 -0400 | [diff] [blame] | 633 | |
Trond Myklebust | 8cd51a0 | 2010-11-15 20:26:22 -0500 | [diff] [blame] | 634 | ret = nfs_readdir_xdr_to_array(desc, page, inode); |
| 635 | if (ret < 0) |
Bryan Schumaker | d1bacf9 | 2010-09-24 14:48:42 -0400 | [diff] [blame] | 636 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 637 | SetPageUptodate(page); |
Bryan Schumaker | d1bacf9 | 2010-09-24 14:48:42 -0400 | [diff] [blame] | 638 | |
Trond Myklebust | 2aac05a | 2008-07-07 13:26:10 -0400 | [diff] [blame] | 639 | if (invalidate_inode_pages2_range(inode->i_mapping, page->index + 1, -1) < 0) { |
Trond Myklebust | cd9ae2b | 2006-10-19 23:28:40 -0700 | [diff] [blame] | 640 | /* Should never happen */ |
| 641 | nfs_zap_mapping(inode, inode->i_mapping); |
| 642 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 643 | unlock_page(page); |
| 644 | return 0; |
| 645 | error: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 646 | unlock_page(page); |
Trond Myklebust | 8cd51a0 | 2010-11-15 20:26:22 -0500 | [diff] [blame] | 647 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 648 | } |
| 649 | |
Bryan Schumaker | d1bacf9 | 2010-09-24 14:48:42 -0400 | [diff] [blame] | 650 | static |
| 651 | void cache_page_release(nfs_readdir_descriptor_t *desc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 652 | { |
Trond Myklebust | 11de3b1 | 2010-12-01 14:17:06 -0500 | [diff] [blame] | 653 | if (!desc->page->mapping) |
| 654 | nfs_readdir_clear_array(desc->page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 655 | page_cache_release(desc->page); |
| 656 | desc->page = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 657 | } |
| 658 | |
Bryan Schumaker | d1bacf9 | 2010-09-24 14:48:42 -0400 | [diff] [blame] | 659 | static |
| 660 | struct page *get_cache_page(nfs_readdir_descriptor_t *desc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 661 | { |
Trond Myklebust | 8cd51a0 | 2010-11-15 20:26:22 -0500 | [diff] [blame] | 662 | return read_cache_page(desc->file->f_path.dentry->d_inode->i_mapping, |
Bryan Schumaker | d1bacf9 | 2010-09-24 14:48:42 -0400 | [diff] [blame] | 663 | desc->page_index, (filler_t *)nfs_readdir_filler, desc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 664 | } |
| 665 | |
| 666 | /* |
Bryan Schumaker | d1bacf9 | 2010-09-24 14:48:42 -0400 | [diff] [blame] | 667 | * Returns 0 if desc->dir_cookie was found on page desc->page_index |
Olivier Galibert | 00a9264 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 668 | */ |
Bryan Schumaker | d1bacf9 | 2010-09-24 14:48:42 -0400 | [diff] [blame] | 669 | static |
| 670 | int find_cache_page(nfs_readdir_descriptor_t *desc) |
Olivier Galibert | 00a9264 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 671 | { |
Bryan Schumaker | d1bacf9 | 2010-09-24 14:48:42 -0400 | [diff] [blame] | 672 | int res; |
Olivier Galibert | 00a9264 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 673 | |
Bryan Schumaker | d1bacf9 | 2010-09-24 14:48:42 -0400 | [diff] [blame] | 674 | desc->page = get_cache_page(desc); |
| 675 | if (IS_ERR(desc->page)) |
| 676 | return PTR_ERR(desc->page); |
Olivier Galibert | 00a9264 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 677 | |
Bryan Schumaker | d1bacf9 | 2010-09-24 14:48:42 -0400 | [diff] [blame] | 678 | res = nfs_readdir_search_array(desc); |
Trond Myklebust | 47c716c | 2010-12-07 12:44:56 -0500 | [diff] [blame] | 679 | if (res != 0) |
| 680 | cache_page_release(desc); |
Bryan Schumaker | d1bacf9 | 2010-09-24 14:48:42 -0400 | [diff] [blame] | 681 | return res; |
Olivier Galibert | 00a9264 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 682 | } |
| 683 | |
Bryan Schumaker | d1bacf9 | 2010-09-24 14:48:42 -0400 | [diff] [blame] | 684 | /* Search for desc->dir_cookie from the beginning of the page cache */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 685 | static inline |
| 686 | int readdir_search_pagecache(nfs_readdir_descriptor_t *desc) |
| 687 | { |
Trond Myklebust | 8cd51a0 | 2010-11-15 20:26:22 -0500 | [diff] [blame] | 688 | int res; |
Olivier Galibert | 00a9264 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 689 | |
Trond Myklebust | 0aded70 | 2010-11-30 21:56:32 -0500 | [diff] [blame] | 690 | if (desc->page_index == 0) { |
Trond Myklebust | 8cd51a0 | 2010-11-15 20:26:22 -0500 | [diff] [blame] | 691 | desc->current_index = 0; |
Trond Myklebust | 0aded70 | 2010-11-30 21:56:32 -0500 | [diff] [blame] | 692 | desc->last_cookie = 0; |
| 693 | } |
Trond Myklebust | 47c716c | 2010-12-07 12:44:56 -0500 | [diff] [blame] | 694 | do { |
Bryan Schumaker | d1bacf9 | 2010-09-24 14:48:42 -0400 | [diff] [blame] | 695 | res = find_cache_page(desc); |
Trond Myklebust | 47c716c | 2010-12-07 12:44:56 -0500 | [diff] [blame] | 696 | } while (res == -EAGAIN); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 697 | return res; |
| 698 | } |
| 699 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 700 | /* |
| 701 | * Once we've found the start of the dirent within a page: fill 'er up... |
| 702 | */ |
| 703 | static |
| 704 | int nfs_do_filldir(nfs_readdir_descriptor_t *desc, void *dirent, |
| 705 | filldir_t filldir) |
| 706 | { |
| 707 | struct file *file = desc->file; |
Bryan Schumaker | d1bacf9 | 2010-09-24 14:48:42 -0400 | [diff] [blame] | 708 | int i = 0; |
| 709 | int res = 0; |
| 710 | struct nfs_cache_array *array = NULL; |
Bryan Schumaker | 8ef2ce3 | 2011-03-23 15:04:31 -0400 | [diff] [blame] | 711 | struct nfs_open_dir_context *ctx = file->private_data; |
| 712 | |
Bryan Schumaker | d1bacf9 | 2010-09-24 14:48:42 -0400 | [diff] [blame] | 713 | array = nfs_readdir_get_array(desc->page); |
Trond Myklebust | e7c58e9 | 2010-11-20 13:22:24 -0500 | [diff] [blame] | 714 | if (IS_ERR(array)) { |
| 715 | res = PTR_ERR(array); |
| 716 | goto out; |
| 717 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 718 | |
Bryan Schumaker | d1bacf9 | 2010-09-24 14:48:42 -0400 | [diff] [blame] | 719 | for (i = desc->cache_entry_index; i < array->size; i++) { |
Trond Myklebust | ece0b42 | 2010-11-20 13:55:33 -0500 | [diff] [blame] | 720 | struct nfs_cache_array_entry *ent; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 721 | |
Trond Myklebust | ece0b42 | 2010-11-20 13:55:33 -0500 | [diff] [blame] | 722 | ent = &array->array[i]; |
| 723 | if (filldir(dirent, ent->string.name, ent->string.len, |
Trond Myklebust | 0b26a0b | 2010-11-20 14:26:44 -0500 | [diff] [blame] | 724 | file->f_pos, nfs_compat_user_ino64(ent->ino), |
| 725 | ent->d_type) < 0) { |
Trond Myklebust | ece0b42 | 2010-11-20 13:55:33 -0500 | [diff] [blame] | 726 | desc->eof = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 727 | break; |
Trond Myklebust | ece0b42 | 2010-11-20 13:55:33 -0500 | [diff] [blame] | 728 | } |
Olivier Galibert | 00a9264 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 729 | file->f_pos++; |
Bryan Schumaker | d1bacf9 | 2010-09-24 14:48:42 -0400 | [diff] [blame] | 730 | if (i < (array->size-1)) |
| 731 | *desc->dir_cookie = array->array[i+1].cookie; |
| 732 | else |
| 733 | *desc->dir_cookie = array->last_cookie; |
Trond Myklebust | 0c03080 | 2011-07-30 12:45:35 -0400 | [diff] [blame] | 734 | if (ctx->duped != 0) |
| 735 | ctx->duped = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 736 | } |
Trond Myklebust | 47c716c | 2010-12-07 12:44:56 -0500 | [diff] [blame] | 737 | if (array->eof_index >= 0) |
Trond Myklebust | 8cd51a0 | 2010-11-15 20:26:22 -0500 | [diff] [blame] | 738 | desc->eof = 1; |
Bryan Schumaker | d1bacf9 | 2010-09-24 14:48:42 -0400 | [diff] [blame] | 739 | |
| 740 | nfs_readdir_release_array(desc->page); |
Trond Myklebust | e7c58e9 | 2010-11-20 13:22:24 -0500 | [diff] [blame] | 741 | out: |
Bryan Schumaker | d1bacf9 | 2010-09-24 14:48:42 -0400 | [diff] [blame] | 742 | cache_page_release(desc); |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 743 | dfprintk(DIRCACHE, "NFS: nfs_do_filldir() filling ended @ cookie %Lu; returning = %d\n", |
| 744 | (unsigned long long)*desc->dir_cookie, res); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 745 | return res; |
| 746 | } |
| 747 | |
| 748 | /* |
| 749 | * If we cannot find a cookie in our cache, we suspect that this is |
| 750 | * because it points to a deleted file, so we ask the server to return |
| 751 | * whatever it thinks is the next entry. We then feed this to filldir. |
| 752 | * If all goes well, we should then be able to find our way round the |
| 753 | * cache on the next call to readdir_search_pagecache(); |
| 754 | * |
| 755 | * NOTE: we cannot add the anonymous page to the pagecache because |
| 756 | * the data it contains might not be page aligned. Besides, |
| 757 | * we should already have a complete representation of the |
| 758 | * directory in the page cache by the time we get here. |
| 759 | */ |
| 760 | static inline |
| 761 | int uncached_readdir(nfs_readdir_descriptor_t *desc, void *dirent, |
| 762 | filldir_t filldir) |
| 763 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 764 | struct page *page = NULL; |
| 765 | int status; |
Bryan Schumaker | d1bacf9 | 2010-09-24 14:48:42 -0400 | [diff] [blame] | 766 | struct inode *inode = desc->file->f_path.dentry->d_inode; |
Trond Myklebust | 0c03080 | 2011-07-30 12:45:35 -0400 | [diff] [blame] | 767 | struct nfs_open_dir_context *ctx = desc->file->private_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 768 | |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 769 | dfprintk(DIRCACHE, "NFS: uncached_readdir() searching for cookie %Lu\n", |
| 770 | (unsigned long long)*desc->dir_cookie); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 771 | |
| 772 | page = alloc_page(GFP_HIGHUSER); |
| 773 | if (!page) { |
| 774 | status = -ENOMEM; |
| 775 | goto out; |
| 776 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 777 | |
Trond Myklebust | 7a8e1dc | 2010-11-20 13:24:46 -0500 | [diff] [blame] | 778 | desc->page_index = 0; |
Trond Myklebust | 0aded70 | 2010-11-30 21:56:32 -0500 | [diff] [blame] | 779 | desc->last_cookie = *desc->dir_cookie; |
Trond Myklebust | 7a8e1dc | 2010-11-20 13:24:46 -0500 | [diff] [blame] | 780 | desc->page = page; |
Trond Myklebust | 0c03080 | 2011-07-30 12:45:35 -0400 | [diff] [blame] | 781 | ctx->duped = 0; |
Trond Myklebust | 7a8e1dc | 2010-11-20 13:24:46 -0500 | [diff] [blame] | 782 | |
Trond Myklebust | 85f8607 | 2010-11-20 13:24:49 -0500 | [diff] [blame] | 783 | status = nfs_readdir_xdr_to_array(desc, page, inode); |
| 784 | if (status < 0) |
Bryan Schumaker | d1bacf9 | 2010-09-24 14:48:42 -0400 | [diff] [blame] | 785 | goto out_release; |
Bryan Schumaker | d1bacf9 | 2010-09-24 14:48:42 -0400 | [diff] [blame] | 786 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 787 | status = nfs_do_filldir(desc, dirent, filldir); |
| 788 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 789 | out: |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 790 | dfprintk(DIRCACHE, "NFS: %s: returns %d\n", |
Harvey Harrison | 3110ff8 | 2008-05-02 13:42:44 -0700 | [diff] [blame] | 791 | __func__, status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 792 | return status; |
| 793 | out_release: |
Bryan Schumaker | d1bacf9 | 2010-09-24 14:48:42 -0400 | [diff] [blame] | 794 | cache_page_release(desc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 795 | goto out; |
| 796 | } |
| 797 | |
Olivier Galibert | 00a9264 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 798 | /* The file offset position represents the dirent entry number. A |
| 799 | last cookie cache takes care of the common case of reading the |
| 800 | whole directory. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 801 | */ |
| 802 | static int nfs_readdir(struct file *filp, void *dirent, filldir_t filldir) |
| 803 | { |
Josef "Jeff" Sipek | 01cce93 | 2006-12-08 02:36:40 -0800 | [diff] [blame] | 804 | struct dentry *dentry = filp->f_path.dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 805 | struct inode *inode = dentry->d_inode; |
| 806 | nfs_readdir_descriptor_t my_desc, |
| 807 | *desc = &my_desc; |
Bryan Schumaker | 480c200 | 2011-03-23 14:48:29 -0400 | [diff] [blame] | 808 | struct nfs_open_dir_context *dir_ctx = filp->private_data; |
Trond Myklebust | 47c716c | 2010-12-07 12:44:56 -0500 | [diff] [blame] | 809 | int res; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 810 | |
Chuck Lever | 6da24bc | 2008-06-11 17:55:58 -0400 | [diff] [blame] | 811 | dfprintk(FILE, "NFS: readdir(%s/%s) starting at cookie %llu\n", |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 812 | dentry->d_parent->d_name.name, dentry->d_name.name, |
| 813 | (long long)filp->f_pos); |
Chuck Lever | 91d5b47 | 2006-03-20 13:44:14 -0500 | [diff] [blame] | 814 | nfs_inc_stats(inode, NFSIOS_VFSGETDENTS); |
| 815 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 816 | /* |
Olivier Galibert | 00a9264 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 817 | * filp->f_pos points to the dirent entry number. |
Trond Myklebust | f0dd213 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 818 | * *desc->dir_cookie has the cookie for the next entry. We have |
Olivier Galibert | 00a9264 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 819 | * to either find the entry with the appropriate number or |
| 820 | * revalidate the cookie. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 821 | */ |
| 822 | memset(desc, 0, sizeof(*desc)); |
| 823 | |
| 824 | desc->file = filp; |
Bryan Schumaker | 480c200 | 2011-03-23 14:48:29 -0400 | [diff] [blame] | 825 | desc->dir_cookie = &dir_ctx->dir_cookie; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 826 | desc->decode = NFS_PROTO(inode)->decode_dirent; |
Trond Myklebust | d69ee9b | 2012-05-01 17:37:59 -0400 | [diff] [blame] | 827 | desc->plus = nfs_use_readdirplus(inode, filp) ? 1 : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 828 | |
Trond Myklebust | 565277f | 2007-10-15 18:17:53 -0400 | [diff] [blame] | 829 | nfs_block_sillyrename(dentry); |
Trond Myklebust | 1cda707 | 2010-02-19 17:03:30 -0800 | [diff] [blame] | 830 | res = nfs_revalidate_mapping(inode, filp->f_mapping); |
Trond Myklebust | fccca7f | 2008-01-26 17:37:47 -0500 | [diff] [blame] | 831 | if (res < 0) |
| 832 | goto out; |
| 833 | |
Trond Myklebust | 47c716c | 2010-12-07 12:44:56 -0500 | [diff] [blame] | 834 | do { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 835 | res = readdir_search_pagecache(desc); |
Olivier Galibert | 00a9264 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 836 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 837 | if (res == -EBADCOOKIE) { |
Trond Myklebust | ece0b42 | 2010-11-20 13:55:33 -0500 | [diff] [blame] | 838 | res = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 839 | /* This means either end of directory */ |
Bryan Schumaker | d1bacf9 | 2010-09-24 14:48:42 -0400 | [diff] [blame] | 840 | if (*desc->dir_cookie && desc->eof == 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 841 | /* Or that the server has 'lost' a cookie */ |
| 842 | res = uncached_readdir(desc, dirent, filldir); |
Trond Myklebust | ece0b42 | 2010-11-20 13:55:33 -0500 | [diff] [blame] | 843 | if (res == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 844 | continue; |
| 845 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 846 | break; |
| 847 | } |
| 848 | if (res == -ETOOSMALL && desc->plus) { |
Benny Halevy | 3a10c30 | 2008-01-23 08:58:59 +0200 | [diff] [blame] | 849 | clear_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(inode)->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 850 | nfs_zap_caches(inode); |
Trond Myklebust | baf57a0 | 2010-09-24 18:49:43 -0400 | [diff] [blame] | 851 | desc->page_index = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 852 | desc->plus = 0; |
Bryan Schumaker | d1bacf9 | 2010-09-24 14:48:42 -0400 | [diff] [blame] | 853 | desc->eof = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 854 | continue; |
| 855 | } |
| 856 | if (res < 0) |
| 857 | break; |
| 858 | |
| 859 | res = nfs_do_filldir(desc, dirent, filldir); |
Trond Myklebust | ece0b42 | 2010-11-20 13:55:33 -0500 | [diff] [blame] | 860 | if (res < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 861 | break; |
Trond Myklebust | 47c716c | 2010-12-07 12:44:56 -0500 | [diff] [blame] | 862 | } while (!desc->eof); |
Trond Myklebust | fccca7f | 2008-01-26 17:37:47 -0500 | [diff] [blame] | 863 | out: |
Trond Myklebust | 565277f | 2007-10-15 18:17:53 -0400 | [diff] [blame] | 864 | nfs_unblock_sillyrename(dentry); |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 865 | if (res > 0) |
| 866 | res = 0; |
Trond Myklebust | aa49b4c | 2010-04-16 16:22:49 -0400 | [diff] [blame] | 867 | dfprintk(FILE, "NFS: readdir(%s/%s) returns %d\n", |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 868 | dentry->d_parent->d_name.name, dentry->d_name.name, |
| 869 | res); |
| 870 | return res; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 871 | } |
| 872 | |
Trond Myklebust | 10afec9 | 2007-05-14 17:16:04 -0400 | [diff] [blame] | 873 | static loff_t nfs_llseek_dir(struct file *filp, loff_t offset, int origin) |
Trond Myklebust | f0dd213 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 874 | { |
Chuck Lever | b84e06c | 2008-06-11 17:55:34 -0400 | [diff] [blame] | 875 | struct dentry *dentry = filp->f_path.dentry; |
| 876 | struct inode *inode = dentry->d_inode; |
Bryan Schumaker | 480c200 | 2011-03-23 14:48:29 -0400 | [diff] [blame] | 877 | struct nfs_open_dir_context *dir_ctx = filp->private_data; |
Chuck Lever | b84e06c | 2008-06-11 17:55:34 -0400 | [diff] [blame] | 878 | |
Chuck Lever | 6da24bc | 2008-06-11 17:55:58 -0400 | [diff] [blame] | 879 | dfprintk(FILE, "NFS: llseek dir(%s/%s, %lld, %d)\n", |
Chuck Lever | b84e06c | 2008-06-11 17:55:34 -0400 | [diff] [blame] | 880 | dentry->d_parent->d_name.name, |
| 881 | dentry->d_name.name, |
| 882 | offset, origin); |
| 883 | |
| 884 | mutex_lock(&inode->i_mutex); |
Trond Myklebust | f0dd213 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 885 | switch (origin) { |
| 886 | case 1: |
| 887 | offset += filp->f_pos; |
| 888 | case 0: |
| 889 | if (offset >= 0) |
| 890 | break; |
| 891 | default: |
| 892 | offset = -EINVAL; |
| 893 | goto out; |
| 894 | } |
| 895 | if (offset != filp->f_pos) { |
| 896 | filp->f_pos = offset; |
Bryan Schumaker | 480c200 | 2011-03-23 14:48:29 -0400 | [diff] [blame] | 897 | dir_ctx->dir_cookie = 0; |
Bryan Schumaker | 8ef2ce3 | 2011-03-23 15:04:31 -0400 | [diff] [blame] | 898 | dir_ctx->duped = 0; |
Trond Myklebust | f0dd213 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 899 | } |
| 900 | out: |
Chuck Lever | b84e06c | 2008-06-11 17:55:34 -0400 | [diff] [blame] | 901 | mutex_unlock(&inode->i_mutex); |
Trond Myklebust | f0dd213 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 902 | return offset; |
| 903 | } |
| 904 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 905 | /* |
| 906 | * All directory operations under NFS are synchronous, so fsync() |
| 907 | * is a dummy operation. |
| 908 | */ |
Josef Bacik | 02c24a8 | 2011-07-16 20:44:56 -0400 | [diff] [blame] | 909 | static int nfs_fsync_dir(struct file *filp, loff_t start, loff_t end, |
| 910 | int datasync) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 911 | { |
Christoph Hellwig | 7ea8085 | 2010-05-26 17:53:25 +0200 | [diff] [blame] | 912 | struct dentry *dentry = filp->f_path.dentry; |
Josef Bacik | 02c24a8 | 2011-07-16 20:44:56 -0400 | [diff] [blame] | 913 | struct inode *inode = dentry->d_inode; |
Christoph Hellwig | 7ea8085 | 2010-05-26 17:53:25 +0200 | [diff] [blame] | 914 | |
Chuck Lever | 6da24bc | 2008-06-11 17:55:58 -0400 | [diff] [blame] | 915 | dfprintk(FILE, "NFS: fsync dir(%s/%s) datasync %d\n", |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 916 | dentry->d_parent->d_name.name, dentry->d_name.name, |
| 917 | datasync); |
| 918 | |
Josef Bacik | 02c24a8 | 2011-07-16 20:44:56 -0400 | [diff] [blame] | 919 | mutex_lock(&inode->i_mutex); |
Chuck Lever | 5491778 | 2008-05-27 16:29:07 -0400 | [diff] [blame] | 920 | nfs_inc_stats(dentry->d_inode, NFSIOS_VFSFSYNC); |
Josef Bacik | 02c24a8 | 2011-07-16 20:44:56 -0400 | [diff] [blame] | 921 | mutex_unlock(&inode->i_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 922 | return 0; |
| 923 | } |
| 924 | |
Trond Myklebust | bfc69a4 | 2007-10-15 18:18:29 -0400 | [diff] [blame] | 925 | /** |
| 926 | * nfs_force_lookup_revalidate - Mark the directory as having changed |
| 927 | * @dir - pointer to directory inode |
| 928 | * |
| 929 | * This forces the revalidation code in nfs_lookup_revalidate() to do a |
| 930 | * full lookup on all child dentries of 'dir' whenever a change occurs |
| 931 | * on the server that might have invalidated our dcache. |
| 932 | * |
| 933 | * The caller should be holding dir->i_lock |
| 934 | */ |
| 935 | void nfs_force_lookup_revalidate(struct inode *dir) |
| 936 | { |
Trond Myklebust | 011935a | 2008-10-14 19:24:50 -0400 | [diff] [blame] | 937 | NFS_I(dir)->cache_change_attribute++; |
Trond Myklebust | bfc69a4 | 2007-10-15 18:18:29 -0400 | [diff] [blame] | 938 | } |
Bryan Schumaker | 89d77c8 | 2012-07-30 16:05:25 -0400 | [diff] [blame] | 939 | EXPORT_SYMBOL_GPL(nfs_force_lookup_revalidate); |
Trond Myklebust | bfc69a4 | 2007-10-15 18:18:29 -0400 | [diff] [blame] | 940 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 941 | /* |
| 942 | * A check for whether or not the parent directory has changed. |
| 943 | * In the case it has, we assume that the dentries are untrustworthy |
| 944 | * and may need to be looked up again. |
| 945 | */ |
Trond Myklebust | c79ba78 | 2007-01-31 08:16:24 -0500 | [diff] [blame] | 946 | static int nfs_check_verifier(struct inode *dir, struct dentry *dentry) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 947 | { |
| 948 | if (IS_ROOT(dentry)) |
| 949 | return 1; |
Trond Myklebust | 4eec952 | 2008-07-15 17:58:13 -0400 | [diff] [blame] | 950 | if (NFS_SERVER(dir)->flags & NFS_MOUNT_LOOKUP_CACHE_NONE) |
| 951 | return 0; |
Trond Myklebust | f2c77f4 | 2007-10-02 12:54:39 -0400 | [diff] [blame] | 952 | if (!nfs_verify_change_attribute(dir, dentry->d_time)) |
| 953 | return 0; |
| 954 | /* Revalidate nfsi->cache_change_attribute before we declare a match */ |
| 955 | if (nfs_revalidate_inode(NFS_SERVER(dir), dir) < 0) |
| 956 | return 0; |
| 957 | if (!nfs_verify_change_attribute(dir, dentry->d_time)) |
| 958 | return 0; |
| 959 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 960 | } |
| 961 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 962 | /* |
Trond Myklebust | a12802c | 2007-10-02 19:13:04 -0400 | [diff] [blame] | 963 | * Use intent information to check whether or not we're going to do |
| 964 | * an O_EXCL create using this path component. |
| 965 | */ |
Al Viro | fa3c56b | 2012-06-10 15:36:40 -0400 | [diff] [blame] | 966 | static int nfs_is_exclusive_create(struct inode *dir, unsigned int flags) |
Trond Myklebust | a12802c | 2007-10-02 19:13:04 -0400 | [diff] [blame] | 967 | { |
| 968 | if (NFS_PROTO(dir)->version == 2) |
| 969 | return 0; |
Al Viro | fa3c56b | 2012-06-10 15:36:40 -0400 | [diff] [blame] | 970 | return flags & LOOKUP_EXCL; |
Trond Myklebust | a12802c | 2007-10-02 19:13:04 -0400 | [diff] [blame] | 971 | } |
| 972 | |
| 973 | /* |
Trond Myklebust | 1d6757f | 2005-06-07 18:37:01 -0400 | [diff] [blame] | 974 | * Inode and filehandle revalidation for lookups. |
| 975 | * |
| 976 | * We force revalidation in the cases where the VFS sets LOOKUP_REVAL, |
| 977 | * or if the intent information indicates that we're about to open this |
| 978 | * particular file and the "nocto" mount flag is not set. |
| 979 | * |
| 980 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 981 | static inline |
Al Viro | fa3c56b | 2012-06-10 15:36:40 -0400 | [diff] [blame] | 982 | int nfs_lookup_verify_inode(struct inode *inode, unsigned int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 983 | { |
| 984 | struct nfs_server *server = NFS_SERVER(inode); |
| 985 | |
David Howells | 36d43a4 | 2011-01-14 18:45:42 +0000 | [diff] [blame] | 986 | if (IS_AUTOMOUNT(inode)) |
Trond Myklebust | 4e99a1f | 2008-03-06 12:34:59 -0500 | [diff] [blame] | 987 | return 0; |
Al Viro | facc353 | 2012-06-10 15:33:51 -0400 | [diff] [blame] | 988 | /* VFS wants an on-the-wire revalidation */ |
Al Viro | fa3c56b | 2012-06-10 15:36:40 -0400 | [diff] [blame] | 989 | if (flags & LOOKUP_REVAL) |
Al Viro | facc353 | 2012-06-10 15:33:51 -0400 | [diff] [blame] | 990 | goto out_force; |
| 991 | /* This is an open(2) */ |
Al Viro | fa3c56b | 2012-06-10 15:36:40 -0400 | [diff] [blame] | 992 | if ((flags & LOOKUP_OPEN) && !(server->flags & NFS_MOUNT_NOCTO) && |
| 993 | (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode))) |
Al Viro | facc353 | 2012-06-10 15:33:51 -0400 | [diff] [blame] | 994 | goto out_force; |
| 995 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 996 | out_force: |
| 997 | return __nfs_revalidate_inode(server, inode); |
| 998 | } |
| 999 | |
| 1000 | /* |
| 1001 | * We judge how long we want to trust negative |
| 1002 | * dentries by looking at the parent inode mtime. |
| 1003 | * |
| 1004 | * If parent mtime has changed, we revalidate, else we wait for a |
| 1005 | * period corresponding to the parent's attribute cache timeout value. |
| 1006 | */ |
| 1007 | static inline |
| 1008 | int nfs_neg_need_reval(struct inode *dir, struct dentry *dentry, |
Al Viro | fa3c56b | 2012-06-10 15:36:40 -0400 | [diff] [blame] | 1009 | unsigned int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1010 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1011 | /* Don't revalidate a negative dentry if we're creating a new file */ |
Al Viro | fa3c56b | 2012-06-10 15:36:40 -0400 | [diff] [blame] | 1012 | if (flags & LOOKUP_CREATE) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1013 | return 0; |
Trond Myklebust | 4eec952 | 2008-07-15 17:58:13 -0400 | [diff] [blame] | 1014 | if (NFS_SERVER(dir)->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) |
| 1015 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1016 | return !nfs_check_verifier(dir, dentry); |
| 1017 | } |
| 1018 | |
| 1019 | /* |
| 1020 | * This is called every time the dcache has a lookup hit, |
| 1021 | * and we should check whether we can really trust that |
| 1022 | * lookup. |
| 1023 | * |
| 1024 | * NOTE! The hit can be a negative hit too, don't assume |
| 1025 | * we have an inode! |
| 1026 | * |
| 1027 | * If the parent directory is seen to have changed, we throw out the |
| 1028 | * cached dentry and do a new lookup. |
| 1029 | */ |
Al Viro | 0b728e1 | 2012-06-10 16:03:43 -0400 | [diff] [blame] | 1030 | static int nfs_lookup_revalidate(struct dentry *dentry, unsigned int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1031 | { |
| 1032 | struct inode *dir; |
| 1033 | struct inode *inode; |
| 1034 | struct dentry *parent; |
Trond Myklebust | e1fb4d0 | 2010-04-16 16:22:47 -0400 | [diff] [blame] | 1035 | struct nfs_fh *fhandle = NULL; |
| 1036 | struct nfs_fattr *fattr = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1037 | int error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1038 | |
Al Viro | fa3c56b | 2012-06-10 15:36:40 -0400 | [diff] [blame] | 1039 | if (flags & LOOKUP_RCU) |
Nick Piggin | 34286d6 | 2011-01-07 17:49:57 +1100 | [diff] [blame] | 1040 | return -ECHILD; |
| 1041 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1042 | parent = dget_parent(dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1043 | dir = parent->d_inode; |
Chuck Lever | 91d5b47 | 2006-03-20 13:44:14 -0500 | [diff] [blame] | 1044 | nfs_inc_stats(dir, NFSIOS_DENTRYREVALIDATE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1045 | inode = dentry->d_inode; |
| 1046 | |
| 1047 | if (!inode) { |
Al Viro | fa3c56b | 2012-06-10 15:36:40 -0400 | [diff] [blame] | 1048 | if (nfs_neg_need_reval(dir, dentry, flags)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1049 | goto out_bad; |
Trond Myklebust | d69ee9b | 2012-05-01 17:37:59 -0400 | [diff] [blame] | 1050 | goto out_valid_noent; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1051 | } |
| 1052 | |
| 1053 | if (is_bad_inode(inode)) { |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 1054 | dfprintk(LOOKUPCACHE, "%s: %s/%s has dud inode\n", |
Harvey Harrison | 3110ff8 | 2008-05-02 13:42:44 -0700 | [diff] [blame] | 1055 | __func__, dentry->d_parent->d_name.name, |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 1056 | dentry->d_name.name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1057 | goto out_bad; |
| 1058 | } |
| 1059 | |
Bryan Schumaker | 011e2a7 | 2012-06-20 15:53:43 -0400 | [diff] [blame] | 1060 | if (NFS_PROTO(dir)->have_delegation(inode, FMODE_READ)) |
Trond Myklebust | 15860ab | 2008-12-23 15:21:54 -0500 | [diff] [blame] | 1061 | goto out_set_verifier; |
| 1062 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1063 | /* Force a full look up iff the parent directory has changed */ |
Al Viro | fa3c56b | 2012-06-10 15:36:40 -0400 | [diff] [blame] | 1064 | if (!nfs_is_exclusive_create(dir, flags) && nfs_check_verifier(dir, dentry)) { |
| 1065 | if (nfs_lookup_verify_inode(inode, flags)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1066 | goto out_zap_parent; |
| 1067 | goto out_valid; |
| 1068 | } |
| 1069 | |
| 1070 | if (NFS_STALE(inode)) |
| 1071 | goto out_bad; |
| 1072 | |
Trond Myklebust | e1fb4d0 | 2010-04-16 16:22:47 -0400 | [diff] [blame] | 1073 | error = -ENOMEM; |
| 1074 | fhandle = nfs_alloc_fhandle(); |
| 1075 | fattr = nfs_alloc_fattr(); |
| 1076 | if (fhandle == NULL || fattr == NULL) |
| 1077 | goto out_error; |
| 1078 | |
Bryan Schumaker | 80a16b2 | 2012-04-27 13:27:46 -0400 | [diff] [blame] | 1079 | error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, fhandle, fattr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1080 | if (error) |
| 1081 | goto out_bad; |
Trond Myklebust | e1fb4d0 | 2010-04-16 16:22:47 -0400 | [diff] [blame] | 1082 | if (nfs_compare_fh(NFS_FH(inode), fhandle)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1083 | goto out_bad; |
Trond Myklebust | e1fb4d0 | 2010-04-16 16:22:47 -0400 | [diff] [blame] | 1084 | if ((error = nfs_refresh_inode(inode, fattr)) != 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1085 | goto out_bad; |
| 1086 | |
Trond Myklebust | e1fb4d0 | 2010-04-16 16:22:47 -0400 | [diff] [blame] | 1087 | nfs_free_fattr(fattr); |
| 1088 | nfs_free_fhandle(fhandle); |
Trond Myklebust | 15860ab | 2008-12-23 15:21:54 -0500 | [diff] [blame] | 1089 | out_set_verifier: |
Trond Myklebust | cf8ba45 | 2007-10-01 13:46:53 -0400 | [diff] [blame] | 1090 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1091 | out_valid: |
Trond Myklebust | d69ee9b | 2012-05-01 17:37:59 -0400 | [diff] [blame] | 1092 | /* Success: notify readdir to use READDIRPLUS */ |
| 1093 | nfs_advise_use_readdirplus(dir); |
| 1094 | out_valid_noent: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1095 | dput(parent); |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 1096 | dfprintk(LOOKUPCACHE, "NFS: %s(%s/%s) is valid\n", |
Harvey Harrison | 3110ff8 | 2008-05-02 13:42:44 -0700 | [diff] [blame] | 1097 | __func__, dentry->d_parent->d_name.name, |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 1098 | dentry->d_name.name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1099 | return 1; |
| 1100 | out_zap_parent: |
| 1101 | nfs_zap_caches(dir); |
| 1102 | out_bad: |
Trond Myklebust | a1643a9 | 2007-09-29 17:25:43 -0400 | [diff] [blame] | 1103 | nfs_mark_for_revalidate(dir); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1104 | if (inode && S_ISDIR(inode->i_mode)) { |
| 1105 | /* Purge readdir caches. */ |
| 1106 | nfs_zap_caches(inode); |
| 1107 | /* If we have submounts, don't unhash ! */ |
| 1108 | if (have_submounts(dentry)) |
| 1109 | goto out_valid; |
Al Viro | d9e80b7 | 2010-04-29 03:10:43 +0100 | [diff] [blame] | 1110 | if (dentry->d_flags & DCACHE_DISCONNECTED) |
| 1111 | goto out_valid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1112 | shrink_dcache_parent(dentry); |
| 1113 | } |
| 1114 | d_drop(dentry); |
Trond Myklebust | e1fb4d0 | 2010-04-16 16:22:47 -0400 | [diff] [blame] | 1115 | nfs_free_fattr(fattr); |
| 1116 | nfs_free_fhandle(fhandle); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1117 | dput(parent); |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 1118 | dfprintk(LOOKUPCACHE, "NFS: %s(%s/%s) is invalid\n", |
Harvey Harrison | 3110ff8 | 2008-05-02 13:42:44 -0700 | [diff] [blame] | 1119 | __func__, dentry->d_parent->d_name.name, |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 1120 | dentry->d_name.name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1121 | return 0; |
Trond Myklebust | e1fb4d0 | 2010-04-16 16:22:47 -0400 | [diff] [blame] | 1122 | out_error: |
| 1123 | nfs_free_fattr(fattr); |
| 1124 | nfs_free_fhandle(fhandle); |
| 1125 | dput(parent); |
| 1126 | dfprintk(LOOKUPCACHE, "NFS: %s(%s/%s) lookup returned error %d\n", |
| 1127 | __func__, dentry->d_parent->d_name.name, |
| 1128 | dentry->d_name.name, error); |
| 1129 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1130 | } |
| 1131 | |
| 1132 | /* |
| 1133 | * This is called from dput() when d_count is going to 0. |
| 1134 | */ |
Nick Piggin | fe15ce4 | 2011-01-07 17:49:23 +1100 | [diff] [blame] | 1135 | static int nfs_dentry_delete(const struct dentry *dentry) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1136 | { |
| 1137 | dfprintk(VFS, "NFS: dentry_delete(%s/%s, %x)\n", |
| 1138 | dentry->d_parent->d_name.name, dentry->d_name.name, |
| 1139 | dentry->d_flags); |
| 1140 | |
Trond Myklebust | 77f1119 | 2008-01-28 19:43:19 -0500 | [diff] [blame] | 1141 | /* Unhash any dentry with a stale inode */ |
| 1142 | if (dentry->d_inode != NULL && NFS_STALE(dentry->d_inode)) |
| 1143 | return 1; |
| 1144 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1145 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { |
| 1146 | /* Unhash it, so that ->d_iput() would be called */ |
| 1147 | return 1; |
| 1148 | } |
| 1149 | if (!(dentry->d_sb->s_flags & MS_ACTIVE)) { |
| 1150 | /* Unhash it, so that ancestors of killed async unlink |
| 1151 | * files will be cleaned up during umount */ |
| 1152 | return 1; |
| 1153 | } |
| 1154 | return 0; |
| 1155 | |
| 1156 | } |
| 1157 | |
Trond Myklebust | 1b83d70 | 2008-06-11 15:44:04 -0400 | [diff] [blame] | 1158 | static void nfs_drop_nlink(struct inode *inode) |
| 1159 | { |
| 1160 | spin_lock(&inode->i_lock); |
| 1161 | if (inode->i_nlink > 0) |
| 1162 | drop_nlink(inode); |
| 1163 | spin_unlock(&inode->i_lock); |
| 1164 | } |
| 1165 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1166 | /* |
| 1167 | * Called when the dentry loses inode. |
| 1168 | * We use it to clean up silly-renamed files. |
| 1169 | */ |
| 1170 | static void nfs_dentry_iput(struct dentry *dentry, struct inode *inode) |
| 1171 | { |
Neil Brown | 83672d3 | 2007-02-26 12:48:25 +1100 | [diff] [blame] | 1172 | if (S_ISDIR(inode->i_mode)) |
| 1173 | /* drop any readdir cache as it could easily be old */ |
| 1174 | NFS_I(inode)->cache_validity |= NFS_INO_INVALID_DATA; |
| 1175 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1176 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { |
Dave Hansen | 9a53c3a | 2006-09-30 23:29:03 -0700 | [diff] [blame] | 1177 | drop_nlink(inode); |
Trond Myklebust | e4eff1a | 2007-07-14 15:39:58 -0400 | [diff] [blame] | 1178 | nfs_complete_unlink(dentry, inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1179 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1180 | iput(inode); |
| 1181 | } |
| 1182 | |
Al Viro | b1942c5 | 2011-03-16 05:44:14 -0400 | [diff] [blame] | 1183 | static void nfs_d_release(struct dentry *dentry) |
| 1184 | { |
| 1185 | /* free cached devname value, if it survived that far */ |
| 1186 | if (unlikely(dentry->d_fsdata)) { |
| 1187 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) |
| 1188 | WARN_ON(1); |
| 1189 | else |
| 1190 | kfree(dentry->d_fsdata); |
| 1191 | } |
| 1192 | } |
| 1193 | |
Al Viro | f786aa9 | 2009-02-20 05:51:22 +0000 | [diff] [blame] | 1194 | const struct dentry_operations nfs_dentry_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1195 | .d_revalidate = nfs_lookup_revalidate, |
| 1196 | .d_delete = nfs_dentry_delete, |
| 1197 | .d_iput = nfs_dentry_iput, |
David Howells | 36d43a4 | 2011-01-14 18:45:42 +0000 | [diff] [blame] | 1198 | .d_automount = nfs_d_automount, |
Al Viro | b1942c5 | 2011-03-16 05:44:14 -0400 | [diff] [blame] | 1199 | .d_release = nfs_d_release, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1200 | }; |
Bryan Schumaker | ddda8e0 | 2012-07-30 16:05:23 -0400 | [diff] [blame] | 1201 | EXPORT_SYMBOL_GPL(nfs_dentry_operations); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1202 | |
Bryan Schumaker | 597d928 | 2012-07-16 16:39:10 -0400 | [diff] [blame] | 1203 | struct dentry *nfs_lookup(struct inode *dir, struct dentry * dentry, unsigned int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1204 | { |
| 1205 | struct dentry *res; |
Trond Myklebust | 565277f | 2007-10-15 18:17:53 -0400 | [diff] [blame] | 1206 | struct dentry *parent; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1207 | struct inode *inode = NULL; |
Trond Myklebust | e1fb4d0 | 2010-04-16 16:22:47 -0400 | [diff] [blame] | 1208 | struct nfs_fh *fhandle = NULL; |
| 1209 | struct nfs_fattr *fattr = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1210 | int error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1211 | |
| 1212 | dfprintk(VFS, "NFS: lookup(%s/%s)\n", |
| 1213 | dentry->d_parent->d_name.name, dentry->d_name.name); |
Chuck Lever | 91d5b47 | 2006-03-20 13:44:14 -0500 | [diff] [blame] | 1214 | nfs_inc_stats(dir, NFSIOS_VFSLOOKUP); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1215 | |
| 1216 | res = ERR_PTR(-ENAMETOOLONG); |
| 1217 | if (dentry->d_name.len > NFS_SERVER(dir)->namelen) |
| 1218 | goto out; |
| 1219 | |
Trond Myklebust | fd68407 | 2006-09-05 12:27:44 -0400 | [diff] [blame] | 1220 | /* |
| 1221 | * If we're doing an exclusive create, optimize away the lookup |
| 1222 | * but don't hash the dentry. |
| 1223 | */ |
Al Viro | 00cd8dd | 2012-06-10 17:13:09 -0400 | [diff] [blame] | 1224 | if (nfs_is_exclusive_create(dir, flags)) { |
Trond Myklebust | fd68407 | 2006-09-05 12:27:44 -0400 | [diff] [blame] | 1225 | d_instantiate(dentry, NULL); |
| 1226 | res = NULL; |
Trond Myklebust | fc0f684 | 2008-06-11 15:44:20 -0400 | [diff] [blame] | 1227 | goto out; |
Trond Myklebust | fd68407 | 2006-09-05 12:27:44 -0400 | [diff] [blame] | 1228 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1229 | |
Trond Myklebust | e1fb4d0 | 2010-04-16 16:22:47 -0400 | [diff] [blame] | 1230 | res = ERR_PTR(-ENOMEM); |
| 1231 | fhandle = nfs_alloc_fhandle(); |
| 1232 | fattr = nfs_alloc_fattr(); |
| 1233 | if (fhandle == NULL || fattr == NULL) |
| 1234 | goto out; |
| 1235 | |
Trond Myklebust | 565277f | 2007-10-15 18:17:53 -0400 | [diff] [blame] | 1236 | parent = dentry->d_parent; |
| 1237 | /* Protect against concurrent sillydeletes */ |
| 1238 | nfs_block_sillyrename(parent); |
Bryan Schumaker | 80a16b2 | 2012-04-27 13:27:46 -0400 | [diff] [blame] | 1239 | error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, fhandle, fattr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1240 | if (error == -ENOENT) |
| 1241 | goto no_entry; |
| 1242 | if (error < 0) { |
| 1243 | res = ERR_PTR(error); |
Trond Myklebust | 565277f | 2007-10-15 18:17:53 -0400 | [diff] [blame] | 1244 | goto out_unblock_sillyrename; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1245 | } |
Trond Myklebust | e1fb4d0 | 2010-04-16 16:22:47 -0400 | [diff] [blame] | 1246 | inode = nfs_fhget(dentry->d_sb, fhandle, fattr); |
Namhyung Kim | bf0c84f | 2010-12-28 17:02:46 +0000 | [diff] [blame] | 1247 | res = ERR_CAST(inode); |
Trond Myklebust | 03f28e3 | 2006-03-20 13:44:48 -0500 | [diff] [blame] | 1248 | if (IS_ERR(res)) |
Trond Myklebust | 565277f | 2007-10-15 18:17:53 -0400 | [diff] [blame] | 1249 | goto out_unblock_sillyrename; |
David Howells | 54ceac4 | 2006-08-22 20:06:13 -0400 | [diff] [blame] | 1250 | |
Trond Myklebust | d69ee9b | 2012-05-01 17:37:59 -0400 | [diff] [blame] | 1251 | /* Success: notify readdir to use READDIRPLUS */ |
| 1252 | nfs_advise_use_readdirplus(dir); |
| 1253 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1254 | no_entry: |
David Howells | 54ceac4 | 2006-08-22 20:06:13 -0400 | [diff] [blame] | 1255 | res = d_materialise_unique(dentry, inode); |
Trond Myklebust | 9eaef27 | 2006-10-21 10:24:20 -0700 | [diff] [blame] | 1256 | if (res != NULL) { |
| 1257 | if (IS_ERR(res)) |
Trond Myklebust | 565277f | 2007-10-15 18:17:53 -0400 | [diff] [blame] | 1258 | goto out_unblock_sillyrename; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1259 | dentry = res; |
Trond Myklebust | 9eaef27 | 2006-10-21 10:24:20 -0700 | [diff] [blame] | 1260 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1261 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
Trond Myklebust | 565277f | 2007-10-15 18:17:53 -0400 | [diff] [blame] | 1262 | out_unblock_sillyrename: |
| 1263 | nfs_unblock_sillyrename(parent); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1264 | out: |
Trond Myklebust | e1fb4d0 | 2010-04-16 16:22:47 -0400 | [diff] [blame] | 1265 | nfs_free_fattr(fattr); |
| 1266 | nfs_free_fhandle(fhandle); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1267 | return res; |
| 1268 | } |
Bryan Schumaker | ddda8e0 | 2012-07-30 16:05:23 -0400 | [diff] [blame] | 1269 | EXPORT_SYMBOL_GPL(nfs_lookup); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1270 | |
Bryan Schumaker | 89d77c8 | 2012-07-30 16:05:25 -0400 | [diff] [blame] | 1271 | #if IS_ENABLED(CONFIG_NFS_V4) |
Al Viro | 0b728e1 | 2012-06-10 16:03:43 -0400 | [diff] [blame] | 1272 | static int nfs4_lookup_revalidate(struct dentry *, unsigned int); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1273 | |
Al Viro | f786aa9 | 2009-02-20 05:51:22 +0000 | [diff] [blame] | 1274 | const struct dentry_operations nfs4_dentry_operations = { |
Miklos Szeredi | 0ef97dc | 2012-05-21 17:30:20 +0200 | [diff] [blame] | 1275 | .d_revalidate = nfs4_lookup_revalidate, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1276 | .d_delete = nfs_dentry_delete, |
| 1277 | .d_iput = nfs_dentry_iput, |
David Howells | 36d43a4 | 2011-01-14 18:45:42 +0000 | [diff] [blame] | 1278 | .d_automount = nfs_d_automount, |
Al Viro | b1942c5 | 2011-03-16 05:44:14 -0400 | [diff] [blame] | 1279 | .d_release = nfs_d_release, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1280 | }; |
Bryan Schumaker | 89d77c8 | 2012-07-30 16:05:25 -0400 | [diff] [blame] | 1281 | EXPORT_SYMBOL_GPL(nfs4_dentry_operations); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1282 | |
Al Viro | 8a5e929 | 2011-06-25 19:15:54 -0400 | [diff] [blame] | 1283 | static fmode_t flags_to_mode(int flags) |
| 1284 | { |
| 1285 | fmode_t res = (__force fmode_t)flags & FMODE_EXEC; |
| 1286 | if ((flags & O_ACCMODE) != O_WRONLY) |
| 1287 | res |= FMODE_READ; |
| 1288 | if ((flags & O_ACCMODE) != O_RDONLY) |
| 1289 | res |= FMODE_WRITE; |
| 1290 | return res; |
| 1291 | } |
| 1292 | |
Al Viro | 5114159 | 2011-06-22 18:47:28 -0400 | [diff] [blame] | 1293 | static struct nfs_open_context *create_nfs_open_context(struct dentry *dentry, int open_flags) |
Trond Myklebust | cd9a1c0 | 2010-09-17 10:56:50 -0400 | [diff] [blame] | 1294 | { |
Al Viro | 5ede7b1 | 2011-10-23 18:49:54 -0400 | [diff] [blame] | 1295 | return alloc_nfs_open_context(dentry, flags_to_mode(open_flags)); |
Trond Myklebust | cd9a1c0 | 2010-09-17 10:56:50 -0400 | [diff] [blame] | 1296 | } |
| 1297 | |
| 1298 | static int do_open(struct inode *inode, struct file *filp) |
| 1299 | { |
| 1300 | nfs_fscache_set_inode_cookie(inode, filp); |
| 1301 | return 0; |
| 1302 | } |
| 1303 | |
Al Viro | d958527 | 2012-06-22 12:39:14 +0400 | [diff] [blame] | 1304 | static int nfs_finish_open(struct nfs_open_context *ctx, |
| 1305 | struct dentry *dentry, |
Al Viro | 30d9049 | 2012-06-22 12:40:19 +0400 | [diff] [blame] | 1306 | struct file *file, unsigned open_flags, |
Al Viro | d958527 | 2012-06-22 12:39:14 +0400 | [diff] [blame] | 1307 | int *opened) |
Trond Myklebust | cd9a1c0 | 2010-09-17 10:56:50 -0400 | [diff] [blame] | 1308 | { |
Miklos Szeredi | 0dd2b47 | 2012-06-05 15:10:18 +0200 | [diff] [blame] | 1309 | int err; |
| 1310 | |
| 1311 | if (ctx->dentry != dentry) { |
| 1312 | dput(ctx->dentry); |
| 1313 | ctx->dentry = dget(dentry); |
| 1314 | } |
Trond Myklebust | cd9a1c0 | 2010-09-17 10:56:50 -0400 | [diff] [blame] | 1315 | |
| 1316 | /* If the open_intent is for execute, we have an extra check to make */ |
| 1317 | if (ctx->mode & FMODE_EXEC) { |
Miklos Szeredi | 0dd2b47 | 2012-06-05 15:10:18 +0200 | [diff] [blame] | 1318 | err = nfs_may_open(dentry->d_inode, ctx->cred, open_flags); |
Al Viro | d958527 | 2012-06-22 12:39:14 +0400 | [diff] [blame] | 1319 | if (err < 0) |
Trond Myklebust | cd9a1c0 | 2010-09-17 10:56:50 -0400 | [diff] [blame] | 1320 | goto out; |
| 1321 | } |
Miklos Szeredi | 0dd2b47 | 2012-06-05 15:10:18 +0200 | [diff] [blame] | 1322 | |
Al Viro | 30d9049 | 2012-06-22 12:40:19 +0400 | [diff] [blame] | 1323 | err = finish_open(file, dentry, do_open, opened); |
| 1324 | if (err) |
Al Viro | d958527 | 2012-06-22 12:39:14 +0400 | [diff] [blame] | 1325 | goto out; |
Al Viro | 30d9049 | 2012-06-22 12:40:19 +0400 | [diff] [blame] | 1326 | nfs_file_set_open_context(file, ctx); |
Miklos Szeredi | 0dd2b47 | 2012-06-05 15:10:18 +0200 | [diff] [blame] | 1327 | |
Trond Myklebust | cd9a1c0 | 2010-09-17 10:56:50 -0400 | [diff] [blame] | 1328 | out: |
| 1329 | put_nfs_open_context(ctx); |
Al Viro | d958527 | 2012-06-22 12:39:14 +0400 | [diff] [blame] | 1330 | return err; |
Trond Myklebust | cd9a1c0 | 2010-09-17 10:56:50 -0400 | [diff] [blame] | 1331 | } |
| 1332 | |
Bryan Schumaker | 73a7970 | 2012-07-16 16:39:12 -0400 | [diff] [blame] | 1333 | int nfs_atomic_open(struct inode *dir, struct dentry *dentry, |
| 1334 | struct file *file, unsigned open_flags, |
| 1335 | umode_t mode, int *opened) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1336 | { |
Trond Myklebust | cd9a1c0 | 2010-09-17 10:56:50 -0400 | [diff] [blame] | 1337 | struct nfs_open_context *ctx; |
Miklos Szeredi | 0dd2b47 | 2012-06-05 15:10:18 +0200 | [diff] [blame] | 1338 | struct dentry *res; |
| 1339 | struct iattr attr = { .ia_valid = ATTR_OPEN }; |
Trond Myklebust | f46e0bd | 2010-09-17 10:56:50 -0400 | [diff] [blame] | 1340 | struct inode *inode; |
Trond Myklebust | 898f635 | 2010-10-23 11:24:25 -0400 | [diff] [blame] | 1341 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1342 | |
Miklos Szeredi | 0dd2b47 | 2012-06-05 15:10:18 +0200 | [diff] [blame] | 1343 | /* Expect a negative dentry */ |
| 1344 | BUG_ON(dentry->d_inode); |
| 1345 | |
| 1346 | dfprintk(VFS, "NFS: atomic_open(%s/%ld), %s\n", |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 1347 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); |
| 1348 | |
Miklos Szeredi | 0dd2b47 | 2012-06-05 15:10:18 +0200 | [diff] [blame] | 1349 | /* NFS only supports OPEN on regular files */ |
| 1350 | if ((open_flags & O_DIRECTORY)) { |
Miklos Szeredi | 0dd2b47 | 2012-06-05 15:10:18 +0200 | [diff] [blame] | 1351 | if (!d_unhashed(dentry)) { |
| 1352 | /* |
| 1353 | * Hashed negative dentry with O_DIRECTORY: dentry was |
| 1354 | * revalidated and is fine, no need to perform lookup |
| 1355 | * again |
| 1356 | */ |
Al Viro | d958527 | 2012-06-22 12:39:14 +0400 | [diff] [blame] | 1357 | return -ENOENT; |
Miklos Szeredi | 0dd2b47 | 2012-06-05 15:10:18 +0200 | [diff] [blame] | 1358 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1359 | goto no_open; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1360 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1361 | |
Miklos Szeredi | 0dd2b47 | 2012-06-05 15:10:18 +0200 | [diff] [blame] | 1362 | if (dentry->d_name.len > NFS_SERVER(dir)->namelen) |
Al Viro | d958527 | 2012-06-22 12:39:14 +0400 | [diff] [blame] | 1363 | return -ENAMETOOLONG; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1364 | |
Miklos Szeredi | 0dd2b47 | 2012-06-05 15:10:18 +0200 | [diff] [blame] | 1365 | if (open_flags & O_CREAT) { |
Trond Myklebust | 536e43d | 2012-01-17 22:04:26 -0500 | [diff] [blame] | 1366 | attr.ia_valid |= ATTR_MODE; |
Miklos Szeredi | 0dd2b47 | 2012-06-05 15:10:18 +0200 | [diff] [blame] | 1367 | attr.ia_mode = mode & ~current_umask(); |
| 1368 | } |
Trond Myklebust | 536e43d | 2012-01-17 22:04:26 -0500 | [diff] [blame] | 1369 | if (open_flags & O_TRUNC) { |
| 1370 | attr.ia_valid |= ATTR_SIZE; |
| 1371 | attr.ia_size = 0; |
Trond Myklebust | cd9a1c0 | 2010-09-17 10:56:50 -0400 | [diff] [blame] | 1372 | } |
| 1373 | |
Miklos Szeredi | 0dd2b47 | 2012-06-05 15:10:18 +0200 | [diff] [blame] | 1374 | ctx = create_nfs_open_context(dentry, open_flags); |
| 1375 | err = PTR_ERR(ctx); |
| 1376 | if (IS_ERR(ctx)) |
Al Viro | d958527 | 2012-06-22 12:39:14 +0400 | [diff] [blame] | 1377 | goto out; |
Miklos Szeredi | 0dd2b47 | 2012-06-05 15:10:18 +0200 | [diff] [blame] | 1378 | |
Trond Myklebust | f46e0bd | 2010-09-17 10:56:50 -0400 | [diff] [blame] | 1379 | nfs_block_sillyrename(dentry->d_parent); |
Trond Myklebust | 2b48429 | 2010-09-17 10:56:51 -0400 | [diff] [blame] | 1380 | inode = NFS_PROTO(dir)->open_context(dir, ctx, open_flags, &attr); |
Miklos Szeredi | 0dd2b47 | 2012-06-05 15:10:18 +0200 | [diff] [blame] | 1381 | d_drop(dentry); |
Trond Myklebust | f46e0bd | 2010-09-17 10:56:50 -0400 | [diff] [blame] | 1382 | if (IS_ERR(inode)) { |
| 1383 | nfs_unblock_sillyrename(dentry->d_parent); |
Trond Myklebust | cd9a1c0 | 2010-09-17 10:56:50 -0400 | [diff] [blame] | 1384 | put_nfs_open_context(ctx); |
Miklos Szeredi | 0dd2b47 | 2012-06-05 15:10:18 +0200 | [diff] [blame] | 1385 | err = PTR_ERR(inode); |
| 1386 | switch (err) { |
| 1387 | case -ENOENT: |
| 1388 | d_add(dentry, NULL); |
| 1389 | break; |
| 1390 | case -EISDIR: |
| 1391 | case -ENOTDIR: |
| 1392 | goto no_open; |
| 1393 | case -ELOOP: |
| 1394 | if (!(open_flags & O_NOFOLLOW)) |
Trond Myklebust | 6f926b5 | 2005-10-18 14:20:18 -0700 | [diff] [blame] | 1395 | goto no_open; |
Miklos Szeredi | 0dd2b47 | 2012-06-05 15:10:18 +0200 | [diff] [blame] | 1396 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1397 | /* case -EINVAL: */ |
Miklos Szeredi | 0dd2b47 | 2012-06-05 15:10:18 +0200 | [diff] [blame] | 1398 | default: |
| 1399 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1400 | } |
Al Viro | d958527 | 2012-06-22 12:39:14 +0400 | [diff] [blame] | 1401 | goto out; |
Trond Myklebust | cd9a1c0 | 2010-09-17 10:56:50 -0400 | [diff] [blame] | 1402 | } |
Trond Myklebust | f46e0bd | 2010-09-17 10:56:50 -0400 | [diff] [blame] | 1403 | res = d_add_unique(dentry, inode); |
Miklos Szeredi | 0dd2b47 | 2012-06-05 15:10:18 +0200 | [diff] [blame] | 1404 | if (res != NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1405 | dentry = res; |
Miklos Szeredi | 0dd2b47 | 2012-06-05 15:10:18 +0200 | [diff] [blame] | 1406 | |
| 1407 | nfs_unblock_sillyrename(dentry->d_parent); |
Trond Myklebust | f46e0bd | 2010-09-17 10:56:50 -0400 | [diff] [blame] | 1408 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
Miklos Szeredi | 0dd2b47 | 2012-06-05 15:10:18 +0200 | [diff] [blame] | 1409 | |
Al Viro | 30d9049 | 2012-06-22 12:40:19 +0400 | [diff] [blame] | 1410 | err = nfs_finish_open(ctx, dentry, file, open_flags, opened); |
Miklos Szeredi | 0dd2b47 | 2012-06-05 15:10:18 +0200 | [diff] [blame] | 1411 | |
| 1412 | dput(res); |
Al Viro | d958527 | 2012-06-22 12:39:14 +0400 | [diff] [blame] | 1413 | out: |
| 1414 | return err; |
Miklos Szeredi | 0dd2b47 | 2012-06-05 15:10:18 +0200 | [diff] [blame] | 1415 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1416 | no_open: |
Al Viro | 00cd8dd | 2012-06-10 17:13:09 -0400 | [diff] [blame] | 1417 | res = nfs_lookup(dir, dentry, 0); |
Miklos Szeredi | 0dd2b47 | 2012-06-05 15:10:18 +0200 | [diff] [blame] | 1418 | err = PTR_ERR(res); |
| 1419 | if (IS_ERR(res)) |
Al Viro | d958527 | 2012-06-22 12:39:14 +0400 | [diff] [blame] | 1420 | goto out; |
Miklos Szeredi | 0dd2b47 | 2012-06-05 15:10:18 +0200 | [diff] [blame] | 1421 | |
Al Viro | e45198a | 2012-06-10 06:48:09 -0400 | [diff] [blame] | 1422 | return finish_no_open(file, res); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1423 | } |
Bryan Schumaker | 89d77c8 | 2012-07-30 16:05:25 -0400 | [diff] [blame] | 1424 | EXPORT_SYMBOL_GPL(nfs_atomic_open); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1425 | |
Al Viro | 0b728e1 | 2012-06-10 16:03:43 -0400 | [diff] [blame] | 1426 | static int nfs4_lookup_revalidate(struct dentry *dentry, unsigned int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1427 | { |
| 1428 | struct dentry *parent = NULL; |
Nick Piggin | 657e94b | 2011-01-14 02:48:39 +0000 | [diff] [blame] | 1429 | struct inode *inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1430 | struct inode *dir; |
Miklos Szeredi | 50de348 | 2012-06-05 15:10:20 +0200 | [diff] [blame] | 1431 | int ret = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1432 | |
Al Viro | fa3c56b | 2012-06-10 15:36:40 -0400 | [diff] [blame] | 1433 | if (flags & LOOKUP_RCU) |
Nick Piggin | 657e94b | 2011-01-14 02:48:39 +0000 | [diff] [blame] | 1434 | return -ECHILD; |
| 1435 | |
Al Viro | fa3c56b | 2012-06-10 15:36:40 -0400 | [diff] [blame] | 1436 | if (!(flags & LOOKUP_OPEN) || (flags & LOOKUP_DIRECTORY)) |
Miklos Szeredi | eda72af | 2012-06-05 15:10:21 +0200 | [diff] [blame] | 1437 | goto no_open; |
| 1438 | if (d_mountpoint(dentry)) |
Trond Myklebust | 5584c30 | 2008-12-23 15:21:54 -0500 | [diff] [blame] | 1439 | goto no_open; |
Trond Myklebust | 2b48429 | 2010-09-17 10:56:51 -0400 | [diff] [blame] | 1440 | |
Miklos Szeredi | eda72af | 2012-06-05 15:10:21 +0200 | [diff] [blame] | 1441 | inode = dentry->d_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1442 | parent = dget_parent(dentry); |
| 1443 | dir = parent->d_inode; |
Trond Myklebust | 2b48429 | 2010-09-17 10:56:51 -0400 | [diff] [blame] | 1444 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1445 | /* We can't create new files in nfs_open_revalidate(), so we |
| 1446 | * optimize away revalidation of negative dentries. |
| 1447 | */ |
Trond Myklebust | 216d5d0 | 2007-10-01 20:10:12 -0400 | [diff] [blame] | 1448 | if (inode == NULL) { |
Al Viro | fa3c56b | 2012-06-10 15:36:40 -0400 | [diff] [blame] | 1449 | if (!nfs_neg_need_reval(dir, dentry, flags)) |
Trond Myklebust | 216d5d0 | 2007-10-01 20:10:12 -0400 | [diff] [blame] | 1450 | ret = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1451 | goto out; |
Trond Myklebust | 216d5d0 | 2007-10-01 20:10:12 -0400 | [diff] [blame] | 1452 | } |
| 1453 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1454 | /* NFS only supports OPEN on regular files */ |
| 1455 | if (!S_ISREG(inode->i_mode)) |
Trond Myklebust | 5584c30 | 2008-12-23 15:21:54 -0500 | [diff] [blame] | 1456 | goto no_open_dput; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1457 | /* We cannot do exclusive creation on a positive dentry */ |
Al Viro | fa3c56b | 2012-06-10 15:36:40 -0400 | [diff] [blame] | 1458 | if (flags & LOOKUP_EXCL) |
Trond Myklebust | 5584c30 | 2008-12-23 15:21:54 -0500 | [diff] [blame] | 1459 | goto no_open_dput; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1460 | |
Miklos Szeredi | 0ef97dc | 2012-05-21 17:30:20 +0200 | [diff] [blame] | 1461 | /* Let f_op->open() actually open (and revalidate) the file */ |
| 1462 | ret = 1; |
Trond Myklebust | 536e43d | 2012-01-17 22:04:26 -0500 | [diff] [blame] | 1463 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1464 | out: |
| 1465 | dput(parent); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1466 | return ret; |
Trond Myklebust | 535918f | 2010-09-17 10:56:51 -0400 | [diff] [blame] | 1467 | |
Trond Myklebust | 5584c30 | 2008-12-23 15:21:54 -0500 | [diff] [blame] | 1468 | no_open_dput: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1469 | dput(parent); |
Trond Myklebust | 5584c30 | 2008-12-23 15:21:54 -0500 | [diff] [blame] | 1470 | no_open: |
Al Viro | 0b728e1 | 2012-06-10 16:03:43 -0400 | [diff] [blame] | 1471 | return nfs_lookup_revalidate(dentry, flags); |
Trond Myklebust | c0204fd | 2010-09-17 10:56:51 -0400 | [diff] [blame] | 1472 | } |
| 1473 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1474 | #endif /* CONFIG_NFSV4 */ |
| 1475 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1476 | /* |
| 1477 | * Code common to create, mkdir, and mknod. |
| 1478 | */ |
| 1479 | int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fhandle, |
| 1480 | struct nfs_fattr *fattr) |
| 1481 | { |
Trond Myklebust | fab728e | 2007-09-29 17:41:33 -0400 | [diff] [blame] | 1482 | struct dentry *parent = dget_parent(dentry); |
| 1483 | struct inode *dir = parent->d_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1484 | struct inode *inode; |
| 1485 | int error = -EACCES; |
| 1486 | |
Trond Myklebust | fab728e | 2007-09-29 17:41:33 -0400 | [diff] [blame] | 1487 | d_drop(dentry); |
| 1488 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1489 | /* We may have been initialized further down */ |
| 1490 | if (dentry->d_inode) |
Trond Myklebust | fab728e | 2007-09-29 17:41:33 -0400 | [diff] [blame] | 1491 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1492 | if (fhandle->size == 0) { |
Bryan Schumaker | 80a16b2 | 2012-04-27 13:27:46 -0400 | [diff] [blame] | 1493 | error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, fhandle, fattr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1494 | if (error) |
Trond Myklebust | fab728e | 2007-09-29 17:41:33 -0400 | [diff] [blame] | 1495 | goto out_error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1496 | } |
Trond Myklebust | 5724ab3 | 2007-10-01 21:51:38 -0400 | [diff] [blame] | 1497 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1498 | if (!(fattr->valid & NFS_ATTR_FATTR)) { |
| 1499 | struct nfs_server *server = NFS_SB(dentry->d_sb); |
David Howells | 8fa5c00 | 2006-08-22 20:06:12 -0400 | [diff] [blame] | 1500 | error = server->nfs_client->rpc_ops->getattr(server, fhandle, fattr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1501 | if (error < 0) |
Trond Myklebust | fab728e | 2007-09-29 17:41:33 -0400 | [diff] [blame] | 1502 | goto out_error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1503 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1504 | inode = nfs_fhget(dentry->d_sb, fhandle, fattr); |
Trond Myklebust | 03f28e3 | 2006-03-20 13:44:48 -0500 | [diff] [blame] | 1505 | error = PTR_ERR(inode); |
| 1506 | if (IS_ERR(inode)) |
Trond Myklebust | fab728e | 2007-09-29 17:41:33 -0400 | [diff] [blame] | 1507 | goto out_error; |
| 1508 | d_add(dentry, inode); |
| 1509 | out: |
| 1510 | dput(parent); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1511 | return 0; |
Trond Myklebust | fab728e | 2007-09-29 17:41:33 -0400 | [diff] [blame] | 1512 | out_error: |
| 1513 | nfs_mark_for_revalidate(dir); |
| 1514 | dput(parent); |
| 1515 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1516 | } |
Bryan Schumaker | ddda8e0 | 2012-07-30 16:05:23 -0400 | [diff] [blame] | 1517 | EXPORT_SYMBOL_GPL(nfs_instantiate); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1518 | |
| 1519 | /* |
| 1520 | * Following a failed create operation, we drop the dentry rather |
| 1521 | * than retain a negative dentry. This avoids a problem in the event |
| 1522 | * that the operation succeeded on the server, but an error in the |
| 1523 | * reply path made it appear to have failed. |
| 1524 | */ |
Bryan Schumaker | 597d928 | 2012-07-16 16:39:10 -0400 | [diff] [blame] | 1525 | int nfs_create(struct inode *dir, struct dentry *dentry, |
Al Viro | ebfc3b4 | 2012-06-10 18:05:36 -0400 | [diff] [blame] | 1526 | umode_t mode, bool excl) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1527 | { |
| 1528 | struct iattr attr; |
Al Viro | ebfc3b4 | 2012-06-10 18:05:36 -0400 | [diff] [blame] | 1529 | int open_flags = excl ? O_CREAT | O_EXCL : O_CREAT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1530 | int error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1531 | |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 1532 | dfprintk(VFS, "NFS: create(%s/%ld), %s\n", |
| 1533 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1534 | |
| 1535 | attr.ia_mode = mode; |
| 1536 | attr.ia_valid = ATTR_MODE; |
| 1537 | |
Miklos Szeredi | 8867fe5 | 2012-06-05 15:10:19 +0200 | [diff] [blame] | 1538 | error = NFS_PROTO(dir)->create(dir, dentry, &attr, open_flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1539 | if (error != 0) |
| 1540 | goto out_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1541 | return 0; |
| 1542 | out_err: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1543 | d_drop(dentry); |
| 1544 | return error; |
| 1545 | } |
Bryan Schumaker | ddda8e0 | 2012-07-30 16:05:23 -0400 | [diff] [blame] | 1546 | EXPORT_SYMBOL_GPL(nfs_create); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1547 | |
| 1548 | /* |
| 1549 | * See comments for nfs_proc_create regarding failed operations. |
| 1550 | */ |
Bryan Schumaker | 597d928 | 2012-07-16 16:39:10 -0400 | [diff] [blame] | 1551 | int |
Al Viro | 1a67aaf | 2011-07-26 01:52:52 -0400 | [diff] [blame] | 1552 | nfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t rdev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1553 | { |
| 1554 | struct iattr attr; |
| 1555 | int status; |
| 1556 | |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 1557 | dfprintk(VFS, "NFS: mknod(%s/%ld), %s\n", |
| 1558 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1559 | |
| 1560 | if (!new_valid_dev(rdev)) |
| 1561 | return -EINVAL; |
| 1562 | |
| 1563 | attr.ia_mode = mode; |
| 1564 | attr.ia_valid = ATTR_MODE; |
| 1565 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1566 | status = NFS_PROTO(dir)->mknod(dir, dentry, &attr, rdev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1567 | if (status != 0) |
| 1568 | goto out_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1569 | return 0; |
| 1570 | out_err: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1571 | d_drop(dentry); |
| 1572 | return status; |
| 1573 | } |
Bryan Schumaker | ddda8e0 | 2012-07-30 16:05:23 -0400 | [diff] [blame] | 1574 | EXPORT_SYMBOL_GPL(nfs_mknod); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1575 | |
| 1576 | /* |
| 1577 | * See comments for nfs_proc_create regarding failed operations. |
| 1578 | */ |
Bryan Schumaker | 597d928 | 2012-07-16 16:39:10 -0400 | [diff] [blame] | 1579 | int nfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1580 | { |
| 1581 | struct iattr attr; |
| 1582 | int error; |
| 1583 | |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 1584 | dfprintk(VFS, "NFS: mkdir(%s/%ld), %s\n", |
| 1585 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1586 | |
| 1587 | attr.ia_valid = ATTR_MODE; |
| 1588 | attr.ia_mode = mode | S_IFDIR; |
| 1589 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1590 | error = NFS_PROTO(dir)->mkdir(dir, dentry, &attr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1591 | if (error != 0) |
| 1592 | goto out_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1593 | return 0; |
| 1594 | out_err: |
| 1595 | d_drop(dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1596 | return error; |
| 1597 | } |
Bryan Schumaker | ddda8e0 | 2012-07-30 16:05:23 -0400 | [diff] [blame] | 1598 | EXPORT_SYMBOL_GPL(nfs_mkdir); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1599 | |
Trond Myklebust | d45b9d8 | 2008-01-28 19:43:18 -0500 | [diff] [blame] | 1600 | static void nfs_dentry_handle_enoent(struct dentry *dentry) |
| 1601 | { |
| 1602 | if (dentry->d_inode != NULL && !d_unhashed(dentry)) |
| 1603 | d_delete(dentry); |
| 1604 | } |
| 1605 | |
Bryan Schumaker | 597d928 | 2012-07-16 16:39:10 -0400 | [diff] [blame] | 1606 | int nfs_rmdir(struct inode *dir, struct dentry *dentry) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1607 | { |
| 1608 | int error; |
| 1609 | |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 1610 | dfprintk(VFS, "NFS: rmdir(%s/%ld), %s\n", |
| 1611 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1612 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1613 | error = NFS_PROTO(dir)->rmdir(dir, &dentry->d_name); |
| 1614 | /* Ensure the VFS deletes this inode */ |
| 1615 | if (error == 0 && dentry->d_inode != NULL) |
Dave Hansen | ce71ec3 | 2006-09-30 23:29:06 -0700 | [diff] [blame] | 1616 | clear_nlink(dentry->d_inode); |
Trond Myklebust | d45b9d8 | 2008-01-28 19:43:18 -0500 | [diff] [blame] | 1617 | else if (error == -ENOENT) |
| 1618 | nfs_dentry_handle_enoent(dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1619 | |
| 1620 | return error; |
| 1621 | } |
Bryan Schumaker | ddda8e0 | 2012-07-30 16:05:23 -0400 | [diff] [blame] | 1622 | EXPORT_SYMBOL_GPL(nfs_rmdir); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1623 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1624 | /* |
| 1625 | * Remove a file after making sure there are no pending writes, |
| 1626 | * and after checking that the file has only one user. |
| 1627 | * |
| 1628 | * We invalidate the attribute cache and free the inode prior to the operation |
| 1629 | * to avoid possible races if the server reuses the inode. |
| 1630 | */ |
| 1631 | static int nfs_safe_remove(struct dentry *dentry) |
| 1632 | { |
| 1633 | struct inode *dir = dentry->d_parent->d_inode; |
| 1634 | struct inode *inode = dentry->d_inode; |
| 1635 | int error = -EBUSY; |
| 1636 | |
| 1637 | dfprintk(VFS, "NFS: safe_remove(%s/%s)\n", |
| 1638 | dentry->d_parent->d_name.name, dentry->d_name.name); |
| 1639 | |
| 1640 | /* If the dentry was sillyrenamed, we simply call d_delete() */ |
| 1641 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { |
| 1642 | error = 0; |
| 1643 | goto out; |
| 1644 | } |
| 1645 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1646 | if (inode != NULL) { |
Bryan Schumaker | 57ec14c | 2012-06-20 15:53:44 -0400 | [diff] [blame] | 1647 | NFS_PROTO(inode)->return_delegation(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1648 | error = NFS_PROTO(dir)->remove(dir, &dentry->d_name); |
| 1649 | /* The VFS may want to delete this inode */ |
| 1650 | if (error == 0) |
Trond Myklebust | 1b83d70 | 2008-06-11 15:44:04 -0400 | [diff] [blame] | 1651 | nfs_drop_nlink(inode); |
Trond Myklebust | 5ba7cc4 | 2005-12-03 15:20:17 -0500 | [diff] [blame] | 1652 | nfs_mark_for_revalidate(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1653 | } else |
| 1654 | error = NFS_PROTO(dir)->remove(dir, &dentry->d_name); |
Trond Myklebust | d45b9d8 | 2008-01-28 19:43:18 -0500 | [diff] [blame] | 1655 | if (error == -ENOENT) |
| 1656 | nfs_dentry_handle_enoent(dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1657 | out: |
| 1658 | return error; |
| 1659 | } |
| 1660 | |
| 1661 | /* We do silly rename. In case sillyrename() returns -EBUSY, the inode |
| 1662 | * belongs to an active ".nfs..." file and we return -EBUSY. |
| 1663 | * |
| 1664 | * If sillyrename() returns 0, we do nothing, otherwise we unlink. |
| 1665 | */ |
Bryan Schumaker | 597d928 | 2012-07-16 16:39:10 -0400 | [diff] [blame] | 1666 | int nfs_unlink(struct inode *dir, struct dentry *dentry) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1667 | { |
| 1668 | int error; |
| 1669 | int need_rehash = 0; |
| 1670 | |
| 1671 | dfprintk(VFS, "NFS: unlink(%s/%ld, %s)\n", dir->i_sb->s_id, |
| 1672 | dir->i_ino, dentry->d_name.name); |
| 1673 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1674 | spin_lock(&dentry->d_lock); |
Nick Piggin | b7ab39f | 2011-01-07 17:49:32 +1100 | [diff] [blame] | 1675 | if (dentry->d_count > 1) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1676 | spin_unlock(&dentry->d_lock); |
Trond Myklebust | ccfeb50 | 2007-01-13 02:28:12 -0500 | [diff] [blame] | 1677 | /* Start asynchronous writeout of the inode */ |
| 1678 | write_inode_now(dentry->d_inode, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1679 | error = nfs_sillyrename(dir, dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1680 | return error; |
| 1681 | } |
| 1682 | if (!d_unhashed(dentry)) { |
| 1683 | __d_drop(dentry); |
| 1684 | need_rehash = 1; |
| 1685 | } |
| 1686 | spin_unlock(&dentry->d_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1687 | error = nfs_safe_remove(dentry); |
Trond Myklebust | d45b9d8 | 2008-01-28 19:43:18 -0500 | [diff] [blame] | 1688 | if (!error || error == -ENOENT) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1689 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
| 1690 | } else if (need_rehash) |
| 1691 | d_rehash(dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1692 | return error; |
| 1693 | } |
Bryan Schumaker | ddda8e0 | 2012-07-30 16:05:23 -0400 | [diff] [blame] | 1694 | EXPORT_SYMBOL_GPL(nfs_unlink); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1695 | |
Chuck Lever | 873101b | 2006-08-22 20:06:23 -0400 | [diff] [blame] | 1696 | /* |
| 1697 | * To create a symbolic link, most file systems instantiate a new inode, |
| 1698 | * add a page to it containing the path, then write it out to the disk |
| 1699 | * using prepare_write/commit_write. |
| 1700 | * |
| 1701 | * Unfortunately the NFS client can't create the in-core inode first |
| 1702 | * because it needs a file handle to create an in-core inode (see |
| 1703 | * fs/nfs/inode.c:nfs_fhget). We only have a file handle *after* the |
| 1704 | * symlink request has completed on the server. |
| 1705 | * |
| 1706 | * So instead we allocate a raw page, copy the symname into it, then do |
| 1707 | * the SYMLINK request with the page as the buffer. If it succeeds, we |
| 1708 | * now have a new file handle and can instantiate an in-core NFS inode |
| 1709 | * and move the raw page into its mapping. |
| 1710 | */ |
Bryan Schumaker | 597d928 | 2012-07-16 16:39:10 -0400 | [diff] [blame] | 1711 | int nfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1712 | { |
Chuck Lever | 873101b | 2006-08-22 20:06:23 -0400 | [diff] [blame] | 1713 | struct pagevec lru_pvec; |
| 1714 | struct page *page; |
| 1715 | char *kaddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1716 | struct iattr attr; |
Chuck Lever | 873101b | 2006-08-22 20:06:23 -0400 | [diff] [blame] | 1717 | unsigned int pathlen = strlen(symname); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1718 | int error; |
| 1719 | |
| 1720 | dfprintk(VFS, "NFS: symlink(%s/%ld, %s, %s)\n", dir->i_sb->s_id, |
| 1721 | dir->i_ino, dentry->d_name.name, symname); |
| 1722 | |
Chuck Lever | 873101b | 2006-08-22 20:06:23 -0400 | [diff] [blame] | 1723 | if (pathlen > PAGE_SIZE) |
| 1724 | return -ENAMETOOLONG; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1725 | |
Chuck Lever | 873101b | 2006-08-22 20:06:23 -0400 | [diff] [blame] | 1726 | attr.ia_mode = S_IFLNK | S_IRWXUGO; |
| 1727 | attr.ia_valid = ATTR_MODE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1728 | |
Jeff Layton | 83d93f2 | 2007-06-07 09:58:08 -0400 | [diff] [blame] | 1729 | page = alloc_page(GFP_HIGHUSER); |
Trond Myklebust | 7656699 | 2008-06-11 15:44:22 -0400 | [diff] [blame] | 1730 | if (!page) |
Chuck Lever | 873101b | 2006-08-22 20:06:23 -0400 | [diff] [blame] | 1731 | return -ENOMEM; |
Chuck Lever | 873101b | 2006-08-22 20:06:23 -0400 | [diff] [blame] | 1732 | |
Cong Wang | 2b86ce2 | 2011-11-25 23:14:33 +0800 | [diff] [blame] | 1733 | kaddr = kmap_atomic(page); |
Chuck Lever | 873101b | 2006-08-22 20:06:23 -0400 | [diff] [blame] | 1734 | memcpy(kaddr, symname, pathlen); |
| 1735 | if (pathlen < PAGE_SIZE) |
| 1736 | memset(kaddr + pathlen, 0, PAGE_SIZE - pathlen); |
Cong Wang | 2b86ce2 | 2011-11-25 23:14:33 +0800 | [diff] [blame] | 1737 | kunmap_atomic(kaddr); |
Chuck Lever | 873101b | 2006-08-22 20:06:23 -0400 | [diff] [blame] | 1738 | |
Chuck Lever | 94a6d75 | 2006-08-22 20:06:23 -0400 | [diff] [blame] | 1739 | error = NFS_PROTO(dir)->symlink(dir, dentry, page, pathlen, &attr); |
Chuck Lever | 873101b | 2006-08-22 20:06:23 -0400 | [diff] [blame] | 1740 | if (error != 0) { |
| 1741 | dfprintk(VFS, "NFS: symlink(%s/%ld, %s, %s) error %d\n", |
| 1742 | dir->i_sb->s_id, dir->i_ino, |
| 1743 | dentry->d_name.name, symname, error); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1744 | d_drop(dentry); |
Chuck Lever | 873101b | 2006-08-22 20:06:23 -0400 | [diff] [blame] | 1745 | __free_page(page); |
Chuck Lever | 873101b | 2006-08-22 20:06:23 -0400 | [diff] [blame] | 1746 | return error; |
| 1747 | } |
| 1748 | |
| 1749 | /* |
| 1750 | * No big deal if we can't add this page to the page cache here. |
| 1751 | * READLINK will get the missing page from the server if needed. |
| 1752 | */ |
| 1753 | pagevec_init(&lru_pvec, 0); |
| 1754 | if (!add_to_page_cache(page, dentry->d_inode->i_mapping, 0, |
| 1755 | GFP_KERNEL)) { |
Chuck Lever | 39cf8a1 | 2006-10-19 23:28:41 -0700 | [diff] [blame] | 1756 | pagevec_add(&lru_pvec, page); |
Rik van Riel | 4f98a2f | 2008-10-18 20:26:32 -0700 | [diff] [blame] | 1757 | pagevec_lru_add_file(&lru_pvec); |
Chuck Lever | 873101b | 2006-08-22 20:06:23 -0400 | [diff] [blame] | 1758 | SetPageUptodate(page); |
| 1759 | unlock_page(page); |
| 1760 | } else |
| 1761 | __free_page(page); |
| 1762 | |
Chuck Lever | 873101b | 2006-08-22 20:06:23 -0400 | [diff] [blame] | 1763 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1764 | } |
Bryan Schumaker | ddda8e0 | 2012-07-30 16:05:23 -0400 | [diff] [blame] | 1765 | EXPORT_SYMBOL_GPL(nfs_symlink); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1766 | |
Bryan Schumaker | 597d928 | 2012-07-16 16:39:10 -0400 | [diff] [blame] | 1767 | int |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1768 | nfs_link(struct dentry *old_dentry, struct inode *dir, struct dentry *dentry) |
| 1769 | { |
| 1770 | struct inode *inode = old_dentry->d_inode; |
| 1771 | int error; |
| 1772 | |
| 1773 | dfprintk(VFS, "NFS: link(%s/%s -> %s/%s)\n", |
| 1774 | old_dentry->d_parent->d_name.name, old_dentry->d_name.name, |
| 1775 | dentry->d_parent->d_name.name, dentry->d_name.name); |
| 1776 | |
Bryan Schumaker | 57ec14c | 2012-06-20 15:53:44 -0400 | [diff] [blame] | 1777 | NFS_PROTO(inode)->return_delegation(inode); |
Trond Myklebust | 9a3936a | 2009-10-26 08:09:46 -0400 | [diff] [blame] | 1778 | |
Trond Myklebust | 9697d23 | 2007-10-02 21:58:05 -0400 | [diff] [blame] | 1779 | d_drop(dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1780 | error = NFS_PROTO(dir)->link(inode, dir, &dentry->d_name); |
Trond Myklebust | cf80955 | 2005-10-27 22:12:42 -0400 | [diff] [blame] | 1781 | if (error == 0) { |
Al Viro | 7de9c6ee | 2010-10-23 11:11:40 -0400 | [diff] [blame] | 1782 | ihold(inode); |
Trond Myklebust | 9697d23 | 2007-10-02 21:58:05 -0400 | [diff] [blame] | 1783 | d_add(dentry, inode); |
Trond Myklebust | cf80955 | 2005-10-27 22:12:42 -0400 | [diff] [blame] | 1784 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1785 | return error; |
| 1786 | } |
Bryan Schumaker | ddda8e0 | 2012-07-30 16:05:23 -0400 | [diff] [blame] | 1787 | EXPORT_SYMBOL_GPL(nfs_link); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1788 | |
| 1789 | /* |
| 1790 | * RENAME |
| 1791 | * FIXME: Some nfsds, like the Linux user space nfsd, may generate a |
| 1792 | * different file handle for the same inode after a rename (e.g. when |
| 1793 | * moving to a different directory). A fail-safe method to do so would |
| 1794 | * be to look up old_dir/old_name, create a link to new_dir/new_name and |
| 1795 | * rename the old file using the sillyrename stuff. This way, the original |
| 1796 | * file in old_dir will go away when the last process iput()s the inode. |
| 1797 | * |
| 1798 | * FIXED. |
| 1799 | * |
| 1800 | * It actually works quite well. One needs to have the possibility for |
| 1801 | * at least one ".nfs..." file in each directory the file ever gets |
| 1802 | * moved or linked to which happens automagically with the new |
| 1803 | * implementation that only depends on the dcache stuff instead of |
| 1804 | * using the inode layer |
| 1805 | * |
| 1806 | * Unfortunately, things are a little more complicated than indicated |
| 1807 | * above. For a cross-directory move, we want to make sure we can get |
| 1808 | * rid of the old inode after the operation. This means there must be |
| 1809 | * no pending writes (if it's a file), and the use count must be 1. |
| 1810 | * If these conditions are met, we can drop the dentries before doing |
| 1811 | * the rename. |
| 1812 | */ |
Bryan Schumaker | 597d928 | 2012-07-16 16:39:10 -0400 | [diff] [blame] | 1813 | int nfs_rename(struct inode *old_dir, struct dentry *old_dentry, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1814 | struct inode *new_dir, struct dentry *new_dentry) |
| 1815 | { |
| 1816 | struct inode *old_inode = old_dentry->d_inode; |
| 1817 | struct inode *new_inode = new_dentry->d_inode; |
| 1818 | struct dentry *dentry = NULL, *rehash = NULL; |
| 1819 | int error = -EBUSY; |
| 1820 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1821 | dfprintk(VFS, "NFS: rename(%s/%s -> %s/%s, ct=%d)\n", |
| 1822 | old_dentry->d_parent->d_name.name, old_dentry->d_name.name, |
| 1823 | new_dentry->d_parent->d_name.name, new_dentry->d_name.name, |
Nick Piggin | b7ab39f | 2011-01-07 17:49:32 +1100 | [diff] [blame] | 1824 | new_dentry->d_count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1825 | |
| 1826 | /* |
Miklos Szeredi | 28f79a1 | 2009-12-03 15:58:56 -0500 | [diff] [blame] | 1827 | * For non-directories, check whether the target is busy and if so, |
| 1828 | * make a copy of the dentry and then do a silly-rename. If the |
| 1829 | * silly-rename succeeds, the copied dentry is hashed and becomes |
| 1830 | * the new target. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1831 | */ |
Miklos Szeredi | 2722610 | 2009-12-03 15:58:56 -0500 | [diff] [blame] | 1832 | if (new_inode && !S_ISDIR(new_inode->i_mode)) { |
| 1833 | /* |
| 1834 | * To prevent any new references to the target during the |
| 1835 | * rename, we unhash the dentry in advance. |
| 1836 | */ |
| 1837 | if (!d_unhashed(new_dentry)) { |
| 1838 | d_drop(new_dentry); |
| 1839 | rehash = new_dentry; |
| 1840 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1841 | |
Nick Piggin | b7ab39f | 2011-01-07 17:49:32 +1100 | [diff] [blame] | 1842 | if (new_dentry->d_count > 2) { |
Miklos Szeredi | 2722610 | 2009-12-03 15:58:56 -0500 | [diff] [blame] | 1843 | int err; |
| 1844 | |
| 1845 | /* copy the target dentry's name */ |
| 1846 | dentry = d_alloc(new_dentry->d_parent, |
| 1847 | &new_dentry->d_name); |
| 1848 | if (!dentry) |
| 1849 | goto out; |
| 1850 | |
| 1851 | /* silly-rename the existing target ... */ |
| 1852 | err = nfs_sillyrename(new_dir, new_dentry); |
Miklos Szeredi | 24e9302 | 2009-12-03 15:58:56 -0500 | [diff] [blame] | 1853 | if (err) |
Miklos Szeredi | 2722610 | 2009-12-03 15:58:56 -0500 | [diff] [blame] | 1854 | goto out; |
Miklos Szeredi | 24e9302 | 2009-12-03 15:58:56 -0500 | [diff] [blame] | 1855 | |
| 1856 | new_dentry = dentry; |
OGAWA Hirofumi | 5633593 | 2010-01-06 18:48:26 -0500 | [diff] [blame] | 1857 | rehash = NULL; |
Miklos Szeredi | 24e9302 | 2009-12-03 15:58:56 -0500 | [diff] [blame] | 1858 | new_inode = NULL; |
Miklos Szeredi | 2722610 | 2009-12-03 15:58:56 -0500 | [diff] [blame] | 1859 | } |
Trond Myklebust | b1e4adf | 2009-03-19 15:35:49 -0400 | [diff] [blame] | 1860 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1861 | |
Bryan Schumaker | 57ec14c | 2012-06-20 15:53:44 -0400 | [diff] [blame] | 1862 | NFS_PROTO(old_inode)->return_delegation(old_inode); |
Trond Myklebust | b1e4adf | 2009-03-19 15:35:49 -0400 | [diff] [blame] | 1863 | if (new_inode != NULL) |
Bryan Schumaker | 57ec14c | 2012-06-20 15:53:44 -0400 | [diff] [blame] | 1864 | NFS_PROTO(new_inode)->return_delegation(new_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1865 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1866 | error = NFS_PROTO(old_dir)->rename(old_dir, &old_dentry->d_name, |
| 1867 | new_dir, &new_dentry->d_name); |
Trond Myklebust | 5ba7cc4 | 2005-12-03 15:20:17 -0500 | [diff] [blame] | 1868 | nfs_mark_for_revalidate(old_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1869 | out: |
| 1870 | if (rehash) |
| 1871 | d_rehash(rehash); |
| 1872 | if (!error) { |
Trond Myklebust | b1e4adf | 2009-03-19 15:35:49 -0400 | [diff] [blame] | 1873 | if (new_inode != NULL) |
| 1874 | nfs_drop_nlink(new_inode); |
Mark Fasheh | 349457c | 2006-09-08 14:22:21 -0700 | [diff] [blame] | 1875 | d_move(old_dentry, new_dentry); |
Chuck Lever | 8fb559f | 2007-09-24 15:40:16 -0400 | [diff] [blame] | 1876 | nfs_set_verifier(new_dentry, |
| 1877 | nfs_save_change_attribute(new_dir)); |
Trond Myklebust | d45b9d8 | 2008-01-28 19:43:18 -0500 | [diff] [blame] | 1878 | } else if (error == -ENOENT) |
| 1879 | nfs_dentry_handle_enoent(old_dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1880 | |
| 1881 | /* new dentry created? */ |
| 1882 | if (dentry) |
| 1883 | dput(dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1884 | return error; |
| 1885 | } |
Bryan Schumaker | ddda8e0 | 2012-07-30 16:05:23 -0400 | [diff] [blame] | 1886 | EXPORT_SYMBOL_GPL(nfs_rename); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1887 | |
Trond Myklebust | cfcea3e | 2006-07-25 11:28:18 -0400 | [diff] [blame] | 1888 | static DEFINE_SPINLOCK(nfs_access_lru_lock); |
| 1889 | static LIST_HEAD(nfs_access_lru_list); |
| 1890 | static atomic_long_t nfs_access_nr_entries; |
| 1891 | |
Trond Myklebust | 1c3c07e | 2006-07-25 11:28:18 -0400 | [diff] [blame] | 1892 | static void nfs_access_free_entry(struct nfs_access_entry *entry) |
| 1893 | { |
| 1894 | put_rpccred(entry->cred); |
| 1895 | kfree(entry); |
Trond Myklebust | cfcea3e | 2006-07-25 11:28:18 -0400 | [diff] [blame] | 1896 | smp_mb__before_atomic_dec(); |
| 1897 | atomic_long_dec(&nfs_access_nr_entries); |
| 1898 | smp_mb__after_atomic_dec(); |
Trond Myklebust | 1c3c07e | 2006-07-25 11:28:18 -0400 | [diff] [blame] | 1899 | } |
| 1900 | |
Trond Myklebust | 1a81bb8 | 2010-05-13 12:51:06 -0400 | [diff] [blame] | 1901 | static void nfs_access_free_list(struct list_head *head) |
| 1902 | { |
| 1903 | struct nfs_access_entry *cache; |
| 1904 | |
| 1905 | while (!list_empty(head)) { |
| 1906 | cache = list_entry(head->next, struct nfs_access_entry, lru); |
| 1907 | list_del(&cache->lru); |
| 1908 | nfs_access_free_entry(cache); |
| 1909 | } |
| 1910 | } |
| 1911 | |
Ying Han | 1495f23 | 2011-05-24 17:12:27 -0700 | [diff] [blame] | 1912 | int nfs_access_cache_shrinker(struct shrinker *shrink, |
| 1913 | struct shrink_control *sc) |
Trond Myklebust | 979df72 | 2006-07-25 11:28:19 -0400 | [diff] [blame] | 1914 | { |
| 1915 | LIST_HEAD(head); |
Trond Myklebust | aa510da | 2010-09-29 15:11:56 -0400 | [diff] [blame] | 1916 | struct nfs_inode *nfsi, *next; |
Trond Myklebust | 979df72 | 2006-07-25 11:28:19 -0400 | [diff] [blame] | 1917 | struct nfs_access_entry *cache; |
Ying Han | 1495f23 | 2011-05-24 17:12:27 -0700 | [diff] [blame] | 1918 | int nr_to_scan = sc->nr_to_scan; |
| 1919 | gfp_t gfp_mask = sc->gfp_mask; |
Trond Myklebust | 979df72 | 2006-07-25 11:28:19 -0400 | [diff] [blame] | 1920 | |
Trond Myklebust | 61d5eb2 | 2010-05-13 12:51:06 -0400 | [diff] [blame] | 1921 | if ((gfp_mask & GFP_KERNEL) != GFP_KERNEL) |
| 1922 | return (nr_to_scan == 0) ? 0 : -1; |
Trond Myklebust | 9c7e7e2 | 2010-05-13 12:51:06 -0400 | [diff] [blame] | 1923 | |
Trond Myklebust | a50f795 | 2007-06-05 19:23:43 -0400 | [diff] [blame] | 1924 | spin_lock(&nfs_access_lru_lock); |
Trond Myklebust | aa510da | 2010-09-29 15:11:56 -0400 | [diff] [blame] | 1925 | list_for_each_entry_safe(nfsi, next, &nfs_access_lru_list, access_cache_inode_lru) { |
Trond Myklebust | 979df72 | 2006-07-25 11:28:19 -0400 | [diff] [blame] | 1926 | struct inode *inode; |
| 1927 | |
| 1928 | if (nr_to_scan-- == 0) |
| 1929 | break; |
Trond Myklebust | 9c7e7e2 | 2010-05-13 12:51:06 -0400 | [diff] [blame] | 1930 | inode = &nfsi->vfs_inode; |
Trond Myklebust | 979df72 | 2006-07-25 11:28:19 -0400 | [diff] [blame] | 1931 | spin_lock(&inode->i_lock); |
| 1932 | if (list_empty(&nfsi->access_cache_entry_lru)) |
| 1933 | goto remove_lru_entry; |
| 1934 | cache = list_entry(nfsi->access_cache_entry_lru.next, |
| 1935 | struct nfs_access_entry, lru); |
| 1936 | list_move(&cache->lru, &head); |
| 1937 | rb_erase(&cache->rb_node, &nfsi->access_cache); |
| 1938 | if (!list_empty(&nfsi->access_cache_entry_lru)) |
| 1939 | list_move_tail(&nfsi->access_cache_inode_lru, |
| 1940 | &nfs_access_lru_list); |
| 1941 | else { |
| 1942 | remove_lru_entry: |
| 1943 | list_del_init(&nfsi->access_cache_inode_lru); |
Trond Myklebust | 9c7e7e2 | 2010-05-13 12:51:06 -0400 | [diff] [blame] | 1944 | smp_mb__before_clear_bit(); |
Trond Myklebust | 979df72 | 2006-07-25 11:28:19 -0400 | [diff] [blame] | 1945 | clear_bit(NFS_INO_ACL_LRU_SET, &nfsi->flags); |
Trond Myklebust | 9c7e7e2 | 2010-05-13 12:51:06 -0400 | [diff] [blame] | 1946 | smp_mb__after_clear_bit(); |
Trond Myklebust | 979df72 | 2006-07-25 11:28:19 -0400 | [diff] [blame] | 1947 | } |
Trond Myklebust | 59844a9 | 2010-05-26 08:42:24 -0400 | [diff] [blame] | 1948 | spin_unlock(&inode->i_lock); |
Trond Myklebust | 979df72 | 2006-07-25 11:28:19 -0400 | [diff] [blame] | 1949 | } |
| 1950 | spin_unlock(&nfs_access_lru_lock); |
Trond Myklebust | 1a81bb8 | 2010-05-13 12:51:06 -0400 | [diff] [blame] | 1951 | nfs_access_free_list(&head); |
Trond Myklebust | 979df72 | 2006-07-25 11:28:19 -0400 | [diff] [blame] | 1952 | return (atomic_long_read(&nfs_access_nr_entries) / 100) * sysctl_vfs_cache_pressure; |
| 1953 | } |
| 1954 | |
Trond Myklebust | 1a81bb8 | 2010-05-13 12:51:06 -0400 | [diff] [blame] | 1955 | static void __nfs_access_zap_cache(struct nfs_inode *nfsi, struct list_head *head) |
Trond Myklebust | 1c3c07e | 2006-07-25 11:28:18 -0400 | [diff] [blame] | 1956 | { |
Trond Myklebust | 1c3c07e | 2006-07-25 11:28:18 -0400 | [diff] [blame] | 1957 | struct rb_root *root_node = &nfsi->access_cache; |
Trond Myklebust | 1a81bb8 | 2010-05-13 12:51:06 -0400 | [diff] [blame] | 1958 | struct rb_node *n; |
Trond Myklebust | 1c3c07e | 2006-07-25 11:28:18 -0400 | [diff] [blame] | 1959 | struct nfs_access_entry *entry; |
| 1960 | |
| 1961 | /* Unhook entries from the cache */ |
| 1962 | while ((n = rb_first(root_node)) != NULL) { |
| 1963 | entry = rb_entry(n, struct nfs_access_entry, rb_node); |
| 1964 | rb_erase(n, root_node); |
Trond Myklebust | 1a81bb8 | 2010-05-13 12:51:06 -0400 | [diff] [blame] | 1965 | list_move(&entry->lru, head); |
Trond Myklebust | 1c3c07e | 2006-07-25 11:28:18 -0400 | [diff] [blame] | 1966 | } |
| 1967 | nfsi->cache_validity &= ~NFS_INO_INVALID_ACCESS; |
Trond Myklebust | 1c3c07e | 2006-07-25 11:28:18 -0400 | [diff] [blame] | 1968 | } |
| 1969 | |
| 1970 | void nfs_access_zap_cache(struct inode *inode) |
| 1971 | { |
Trond Myklebust | 1a81bb8 | 2010-05-13 12:51:06 -0400 | [diff] [blame] | 1972 | LIST_HEAD(head); |
| 1973 | |
| 1974 | if (test_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags) == 0) |
| 1975 | return; |
Trond Myklebust | cfcea3e | 2006-07-25 11:28:18 -0400 | [diff] [blame] | 1976 | /* Remove from global LRU init */ |
Trond Myklebust | 1a81bb8 | 2010-05-13 12:51:06 -0400 | [diff] [blame] | 1977 | spin_lock(&nfs_access_lru_lock); |
| 1978 | if (test_and_clear_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags)) |
Trond Myklebust | cfcea3e | 2006-07-25 11:28:18 -0400 | [diff] [blame] | 1979 | list_del_init(&NFS_I(inode)->access_cache_inode_lru); |
Trond Myklebust | cfcea3e | 2006-07-25 11:28:18 -0400 | [diff] [blame] | 1980 | |
Trond Myklebust | 1c3c07e | 2006-07-25 11:28:18 -0400 | [diff] [blame] | 1981 | spin_lock(&inode->i_lock); |
Trond Myklebust | 1a81bb8 | 2010-05-13 12:51:06 -0400 | [diff] [blame] | 1982 | __nfs_access_zap_cache(NFS_I(inode), &head); |
| 1983 | spin_unlock(&inode->i_lock); |
| 1984 | spin_unlock(&nfs_access_lru_lock); |
| 1985 | nfs_access_free_list(&head); |
Trond Myklebust | 1c3c07e | 2006-07-25 11:28:18 -0400 | [diff] [blame] | 1986 | } |
Bryan Schumaker | 1c606fb | 2012-07-30 16:05:24 -0400 | [diff] [blame] | 1987 | EXPORT_SYMBOL_GPL(nfs_access_zap_cache); |
Trond Myklebust | 1c3c07e | 2006-07-25 11:28:18 -0400 | [diff] [blame] | 1988 | |
| 1989 | static struct nfs_access_entry *nfs_access_search_rbtree(struct inode *inode, struct rpc_cred *cred) |
| 1990 | { |
| 1991 | struct rb_node *n = NFS_I(inode)->access_cache.rb_node; |
| 1992 | struct nfs_access_entry *entry; |
| 1993 | |
| 1994 | while (n != NULL) { |
| 1995 | entry = rb_entry(n, struct nfs_access_entry, rb_node); |
| 1996 | |
| 1997 | if (cred < entry->cred) |
| 1998 | n = n->rb_left; |
| 1999 | else if (cred > entry->cred) |
| 2000 | n = n->rb_right; |
| 2001 | else |
| 2002 | return entry; |
| 2003 | } |
| 2004 | return NULL; |
| 2005 | } |
| 2006 | |
Trond Myklebust | af22f94 | 2007-08-10 17:45:10 -0400 | [diff] [blame] | 2007 | static int nfs_access_get_cached(struct inode *inode, struct rpc_cred *cred, struct nfs_access_entry *res) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2008 | { |
Chuck Lever | 5529680 | 2005-08-18 11:24:09 -0700 | [diff] [blame] | 2009 | struct nfs_inode *nfsi = NFS_I(inode); |
Trond Myklebust | 1c3c07e | 2006-07-25 11:28:18 -0400 | [diff] [blame] | 2010 | struct nfs_access_entry *cache; |
| 2011 | int err = -ENOENT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2012 | |
Trond Myklebust | 1c3c07e | 2006-07-25 11:28:18 -0400 | [diff] [blame] | 2013 | spin_lock(&inode->i_lock); |
| 2014 | if (nfsi->cache_validity & NFS_INO_INVALID_ACCESS) |
| 2015 | goto out_zap; |
| 2016 | cache = nfs_access_search_rbtree(inode, cred); |
| 2017 | if (cache == NULL) |
| 2018 | goto out; |
Trond Myklebust | b4d2314 | 2010-03-10 15:21:44 -0500 | [diff] [blame] | 2019 | if (!nfs_have_delegated_attributes(inode) && |
Peter Staubach | 64672d5 | 2008-12-23 15:21:56 -0500 | [diff] [blame] | 2020 | !time_in_range_open(jiffies, cache->jiffies, cache->jiffies + nfsi->attrtimeo)) |
Trond Myklebust | 1c3c07e | 2006-07-25 11:28:18 -0400 | [diff] [blame] | 2021 | goto out_stale; |
| 2022 | res->jiffies = cache->jiffies; |
| 2023 | res->cred = cache->cred; |
| 2024 | res->mask = cache->mask; |
Trond Myklebust | cfcea3e | 2006-07-25 11:28:18 -0400 | [diff] [blame] | 2025 | list_move_tail(&cache->lru, &nfsi->access_cache_entry_lru); |
Trond Myklebust | 1c3c07e | 2006-07-25 11:28:18 -0400 | [diff] [blame] | 2026 | err = 0; |
| 2027 | out: |
| 2028 | spin_unlock(&inode->i_lock); |
| 2029 | return err; |
| 2030 | out_stale: |
| 2031 | rb_erase(&cache->rb_node, &nfsi->access_cache); |
Trond Myklebust | cfcea3e | 2006-07-25 11:28:18 -0400 | [diff] [blame] | 2032 | list_del(&cache->lru); |
Trond Myklebust | 1c3c07e | 2006-07-25 11:28:18 -0400 | [diff] [blame] | 2033 | spin_unlock(&inode->i_lock); |
| 2034 | nfs_access_free_entry(cache); |
| 2035 | return -ENOENT; |
| 2036 | out_zap: |
Trond Myklebust | 1a81bb8 | 2010-05-13 12:51:06 -0400 | [diff] [blame] | 2037 | spin_unlock(&inode->i_lock); |
| 2038 | nfs_access_zap_cache(inode); |
Trond Myklebust | 1c3c07e | 2006-07-25 11:28:18 -0400 | [diff] [blame] | 2039 | return -ENOENT; |
| 2040 | } |
| 2041 | |
| 2042 | static void nfs_access_add_rbtree(struct inode *inode, struct nfs_access_entry *set) |
| 2043 | { |
Trond Myklebust | cfcea3e | 2006-07-25 11:28:18 -0400 | [diff] [blame] | 2044 | struct nfs_inode *nfsi = NFS_I(inode); |
| 2045 | struct rb_root *root_node = &nfsi->access_cache; |
Trond Myklebust | 1c3c07e | 2006-07-25 11:28:18 -0400 | [diff] [blame] | 2046 | struct rb_node **p = &root_node->rb_node; |
| 2047 | struct rb_node *parent = NULL; |
| 2048 | struct nfs_access_entry *entry; |
| 2049 | |
| 2050 | spin_lock(&inode->i_lock); |
| 2051 | while (*p != NULL) { |
| 2052 | parent = *p; |
| 2053 | entry = rb_entry(parent, struct nfs_access_entry, rb_node); |
| 2054 | |
| 2055 | if (set->cred < entry->cred) |
| 2056 | p = &parent->rb_left; |
| 2057 | else if (set->cred > entry->cred) |
| 2058 | p = &parent->rb_right; |
| 2059 | else |
| 2060 | goto found; |
| 2061 | } |
| 2062 | rb_link_node(&set->rb_node, parent, p); |
| 2063 | rb_insert_color(&set->rb_node, root_node); |
Trond Myklebust | cfcea3e | 2006-07-25 11:28:18 -0400 | [diff] [blame] | 2064 | list_add_tail(&set->lru, &nfsi->access_cache_entry_lru); |
Trond Myklebust | 1c3c07e | 2006-07-25 11:28:18 -0400 | [diff] [blame] | 2065 | spin_unlock(&inode->i_lock); |
| 2066 | return; |
| 2067 | found: |
| 2068 | rb_replace_node(parent, &set->rb_node, root_node); |
Trond Myklebust | cfcea3e | 2006-07-25 11:28:18 -0400 | [diff] [blame] | 2069 | list_add_tail(&set->lru, &nfsi->access_cache_entry_lru); |
| 2070 | list_del(&entry->lru); |
Trond Myklebust | 1c3c07e | 2006-07-25 11:28:18 -0400 | [diff] [blame] | 2071 | spin_unlock(&inode->i_lock); |
| 2072 | nfs_access_free_entry(entry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2073 | } |
| 2074 | |
Trond Myklebust | af22f94 | 2007-08-10 17:45:10 -0400 | [diff] [blame] | 2075 | static void nfs_access_add_cache(struct inode *inode, struct nfs_access_entry *set) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2076 | { |
Trond Myklebust | 1c3c07e | 2006-07-25 11:28:18 -0400 | [diff] [blame] | 2077 | struct nfs_access_entry *cache = kmalloc(sizeof(*cache), GFP_KERNEL); |
| 2078 | if (cache == NULL) |
| 2079 | return; |
| 2080 | RB_CLEAR_NODE(&cache->rb_node); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2081 | cache->jiffies = set->jiffies; |
Trond Myklebust | 1c3c07e | 2006-07-25 11:28:18 -0400 | [diff] [blame] | 2082 | cache->cred = get_rpccred(set->cred); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2083 | cache->mask = set->mask; |
Trond Myklebust | 1c3c07e | 2006-07-25 11:28:18 -0400 | [diff] [blame] | 2084 | |
| 2085 | nfs_access_add_rbtree(inode, cache); |
Trond Myklebust | cfcea3e | 2006-07-25 11:28:18 -0400 | [diff] [blame] | 2086 | |
| 2087 | /* Update accounting */ |
| 2088 | smp_mb__before_atomic_inc(); |
| 2089 | atomic_long_inc(&nfs_access_nr_entries); |
| 2090 | smp_mb__after_atomic_inc(); |
| 2091 | |
| 2092 | /* Add inode to global LRU list */ |
Trond Myklebust | 1a81bb8 | 2010-05-13 12:51:06 -0400 | [diff] [blame] | 2093 | if (!test_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags)) { |
Trond Myklebust | cfcea3e | 2006-07-25 11:28:18 -0400 | [diff] [blame] | 2094 | spin_lock(&nfs_access_lru_lock); |
Trond Myklebust | 1a81bb8 | 2010-05-13 12:51:06 -0400 | [diff] [blame] | 2095 | if (!test_and_set_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags)) |
| 2096 | list_add_tail(&NFS_I(inode)->access_cache_inode_lru, |
| 2097 | &nfs_access_lru_list); |
Trond Myklebust | cfcea3e | 2006-07-25 11:28:18 -0400 | [diff] [blame] | 2098 | spin_unlock(&nfs_access_lru_lock); |
| 2099 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2100 | } |
| 2101 | |
| 2102 | static int nfs_do_access(struct inode *inode, struct rpc_cred *cred, int mask) |
| 2103 | { |
| 2104 | struct nfs_access_entry cache; |
| 2105 | int status; |
| 2106 | |
| 2107 | status = nfs_access_get_cached(inode, cred, &cache); |
| 2108 | if (status == 0) |
| 2109 | goto out; |
| 2110 | |
| 2111 | /* Be clever: ask server to check for all possible rights */ |
| 2112 | cache.mask = MAY_EXEC | MAY_WRITE | MAY_READ; |
| 2113 | cache.cred = cred; |
| 2114 | cache.jiffies = jiffies; |
| 2115 | status = NFS_PROTO(inode)->access(inode, &cache); |
Suresh Jayaraman | a71ee33 | 2009-03-10 20:33:21 -0400 | [diff] [blame] | 2116 | if (status != 0) { |
| 2117 | if (status == -ESTALE) { |
| 2118 | nfs_zap_caches(inode); |
| 2119 | if (!S_ISDIR(inode->i_mode)) |
| 2120 | set_bit(NFS_INO_STALE, &NFS_I(inode)->flags); |
| 2121 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2122 | return status; |
Suresh Jayaraman | a71ee33 | 2009-03-10 20:33:21 -0400 | [diff] [blame] | 2123 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2124 | nfs_access_add_cache(inode, &cache); |
| 2125 | out: |
Al Viro | e6305c4 | 2008-07-15 21:03:57 -0400 | [diff] [blame] | 2126 | if ((mask & ~cache.mask & (MAY_READ | MAY_WRITE | MAY_EXEC)) == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2127 | return 0; |
| 2128 | return -EACCES; |
| 2129 | } |
| 2130 | |
Trond Myklebust | af22f94 | 2007-08-10 17:45:10 -0400 | [diff] [blame] | 2131 | static int nfs_open_permission_mask(int openflags) |
| 2132 | { |
| 2133 | int mask = 0; |
| 2134 | |
Al Viro | 8a5e929 | 2011-06-25 19:15:54 -0400 | [diff] [blame] | 2135 | if ((openflags & O_ACCMODE) != O_WRONLY) |
Trond Myklebust | af22f94 | 2007-08-10 17:45:10 -0400 | [diff] [blame] | 2136 | mask |= MAY_READ; |
Al Viro | 8a5e929 | 2011-06-25 19:15:54 -0400 | [diff] [blame] | 2137 | if ((openflags & O_ACCMODE) != O_RDONLY) |
Trond Myklebust | af22f94 | 2007-08-10 17:45:10 -0400 | [diff] [blame] | 2138 | mask |= MAY_WRITE; |
Al Viro | 8a5e929 | 2011-06-25 19:15:54 -0400 | [diff] [blame] | 2139 | if (openflags & __FMODE_EXEC) |
Trond Myklebust | af22f94 | 2007-08-10 17:45:10 -0400 | [diff] [blame] | 2140 | mask |= MAY_EXEC; |
| 2141 | return mask; |
| 2142 | } |
| 2143 | |
| 2144 | int nfs_may_open(struct inode *inode, struct rpc_cred *cred, int openflags) |
| 2145 | { |
| 2146 | return nfs_do_access(inode, cred, nfs_open_permission_mask(openflags)); |
| 2147 | } |
Bryan Schumaker | 89d77c8 | 2012-07-30 16:05:25 -0400 | [diff] [blame] | 2148 | EXPORT_SYMBOL_GPL(nfs_may_open); |
Trond Myklebust | af22f94 | 2007-08-10 17:45:10 -0400 | [diff] [blame] | 2149 | |
Al Viro | 10556cb | 2011-06-20 19:28:19 -0400 | [diff] [blame] | 2150 | int nfs_permission(struct inode *inode, int mask) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2151 | { |
| 2152 | struct rpc_cred *cred; |
| 2153 | int res = 0; |
| 2154 | |
Al Viro | 10556cb | 2011-06-20 19:28:19 -0400 | [diff] [blame] | 2155 | if (mask & MAY_NOT_BLOCK) |
Nick Piggin | b74c79e | 2011-01-07 17:49:58 +1100 | [diff] [blame] | 2156 | return -ECHILD; |
| 2157 | |
Chuck Lever | 91d5b47 | 2006-03-20 13:44:14 -0500 | [diff] [blame] | 2158 | nfs_inc_stats(inode, NFSIOS_VFSACCESS); |
| 2159 | |
Al Viro | e6305c4 | 2008-07-15 21:03:57 -0400 | [diff] [blame] | 2160 | if ((mask & (MAY_READ | MAY_WRITE | MAY_EXEC)) == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2161 | goto out; |
| 2162 | /* Is this sys_access() ? */ |
Eric Paris | 9cfcac8 | 2010-07-23 11:43:51 -0400 | [diff] [blame] | 2163 | if (mask & (MAY_ACCESS | MAY_CHDIR)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2164 | goto force_lookup; |
| 2165 | |
| 2166 | switch (inode->i_mode & S_IFMT) { |
| 2167 | case S_IFLNK: |
| 2168 | goto out; |
| 2169 | case S_IFREG: |
| 2170 | /* NFSv4 has atomic_open... */ |
| 2171 | if (nfs_server_capable(inode, NFS_CAP_ATOMIC_OPEN) |
Frank Filz | 7ee2cb7 | 2009-05-18 17:41:40 -0400 | [diff] [blame] | 2172 | && (mask & MAY_OPEN) |
| 2173 | && !(mask & MAY_EXEC)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2174 | goto out; |
| 2175 | break; |
| 2176 | case S_IFDIR: |
| 2177 | /* |
| 2178 | * Optimize away all write operations, since the server |
| 2179 | * will check permissions when we perform the op. |
| 2180 | */ |
| 2181 | if ((mask & MAY_WRITE) && !(mask & MAY_READ)) |
| 2182 | goto out; |
| 2183 | } |
| 2184 | |
| 2185 | force_lookup: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2186 | if (!NFS_PROTO(inode)->access) |
| 2187 | goto out_notsup; |
| 2188 | |
Trond Myklebust | 98a8e32 | 2008-03-12 12:25:28 -0400 | [diff] [blame] | 2189 | cred = rpc_lookup_cred(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2190 | if (!IS_ERR(cred)) { |
| 2191 | res = nfs_do_access(inode, cred, mask); |
| 2192 | put_rpccred(cred); |
| 2193 | } else |
| 2194 | res = PTR_ERR(cred); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2195 | out: |
Miklos Szeredi | f696a36 | 2008-07-31 13:41:58 +0200 | [diff] [blame] | 2196 | if (!res && (mask & MAY_EXEC) && !execute_ok(inode)) |
| 2197 | res = -EACCES; |
| 2198 | |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 2199 | dfprintk(VFS, "NFS: permission(%s/%ld), mask=0x%x, res=%d\n", |
| 2200 | inode->i_sb->s_id, inode->i_ino, mask, res); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2201 | return res; |
| 2202 | out_notsup: |
| 2203 | res = nfs_revalidate_inode(NFS_SERVER(inode), inode); |
| 2204 | if (res == 0) |
Al Viro | 2830ba7 | 2011-06-20 19:16:29 -0400 | [diff] [blame] | 2205 | res = generic_permission(inode, mask); |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 2206 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2207 | } |
Bryan Schumaker | ddda8e0 | 2012-07-30 16:05:23 -0400 | [diff] [blame] | 2208 | EXPORT_SYMBOL_GPL(nfs_permission); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2209 | |
| 2210 | /* |
| 2211 | * Local variables: |
| 2212 | * version-control: t |
| 2213 | * kept-new-versions: 5 |
| 2214 | * End: |
| 2215 | */ |