blob: 510040b04c964dbdeab4ab47c29b789fef5c4b5f [file] [log] [blame]
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001/*
2 * linux/fs/9p/vfs_inode.c
3 *
Eric Van Hensbergen73c592b2005-09-09 13:04:26 -07004 * This file contains vfs inode ops for the 9P2000 protocol.
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07005 *
6 * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
7 * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
8 *
9 * This program is free software; you can redistribute it and/or modify
Eric Van Hensbergen42e8c502006-03-25 03:07:28 -080010 * it under the terms of the GNU General Public License version 2
11 * as published by the Free Software Foundation.
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -070012 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to:
20 * Free Software Foundation
21 * 51 Franklin Street, Fifth Floor
22 * Boston, MA 02111-1301 USA
23 *
24 */
25
Joe Perches5d385152011-11-28 10:40:46 -080026#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
27
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -070028#include <linux/module.h>
29#include <linux/errno.h>
30#include <linux/fs.h>
31#include <linux/file.h>
32#include <linux/pagemap.h>
33#include <linux/stat.h>
34#include <linux/string.h>
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -070035#include <linux/inet.h>
36#include <linux/namei.h>
37#include <linux/idr.h>
Alexey Dobriyane8edc6e2007-05-21 01:22:52 +040038#include <linux/sched.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090039#include <linux/slab.h>
Aneesh Kumar K.Vebf46262010-05-31 13:22:56 +053040#include <linux/xattr.h>
Aneesh Kumar K.V85ff8722010-09-28 00:27:39 +053041#include <linux/posix_acl.h>
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -050042#include <net/9p/9p.h>
43#include <net/9p/client.h>
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -070044
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -070045#include "v9fs.h"
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -070046#include "v9fs_vfs.h"
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -070047#include "fid.h"
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -050048#include "cache.h"
Aneesh Kumar K.Vebf46262010-05-31 13:22:56 +053049#include "xattr.h"
Aneesh Kumar K.V85ff8722010-09-28 00:27:39 +053050#include "acl.h"
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -070051
Arjan van de Ven754661f2007-02-12 00:55:38 -080052static const struct inode_operations v9fs_dir_inode_operations;
Sripathi Kodi9b6533c2010-03-25 12:41:54 +000053static const struct inode_operations v9fs_dir_inode_operations_dotu;
Arjan van de Ven754661f2007-02-12 00:55:38 -080054static const struct inode_operations v9fs_file_inode_operations;
55static const struct inode_operations v9fs_symlink_inode_operations;
Aneesh Kumar K.Vf5fc6142010-10-12 13:02:25 +053056
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -070057/**
58 * unixmode2p9mode - convert unix mode bits to plan 9
59 * @v9ses: v9fs session information
60 * @mode: mode to convert
61 *
62 */
63
Al Viro3eda0de2011-07-26 02:53:22 -040064static u32 unixmode2p9mode(struct v9fs_session_info *v9ses, umode_t mode)
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -070065{
66 int res;
67 res = mode & 0777;
68 if (S_ISDIR(mode))
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -050069 res |= P9_DMDIR;
Sripathi Kodidd6102f2010-03-05 18:48:00 +000070 if (v9fs_proto_dotu(v9ses)) {
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -070071 if (v9ses->nodev == 0) {
72 if (S_ISSOCK(mode))
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -050073 res |= P9_DMSOCKET;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -070074 if (S_ISFIFO(mode))
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -050075 res |= P9_DMNAMEDPIPE;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -070076 if (S_ISBLK(mode))
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -050077 res |= P9_DMDEVICE;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -070078 if (S_ISCHR(mode))
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -050079 res |= P9_DMDEVICE;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -070080 }
81
82 if ((mode & S_ISUID) == S_ISUID)
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -050083 res |= P9_DMSETUID;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -070084 if ((mode & S_ISGID) == S_ISGID)
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -050085 res |= P9_DMSETGID;
Anthony Liguorid199d652008-02-06 19:25:06 -060086 if ((mode & S_ISVTX) == S_ISVTX)
87 res |= P9_DMSETVTX;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -070088 }
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -070089 return res;
90}
91
92/**
Aneesh Kumar K.Vdf345c62012-01-05 13:39:49 +053093 * p9mode2perm- convert plan9 mode bits to unix permission bits
94 * @v9ses: v9fs session information
95 * @stat: p9_wstat from which mode need to be derived
96 *
97 */
98static int p9mode2perm(struct v9fs_session_info *v9ses,
99 struct p9_wstat *stat)
100{
101 int res;
102 int mode = stat->mode;
103
104 res = mode & S_IALLUGO;
105 if (v9fs_proto_dotu(v9ses)) {
106 if ((mode & P9_DMSETUID) == P9_DMSETUID)
107 res |= S_ISUID;
108
109 if ((mode & P9_DMSETGID) == P9_DMSETGID)
110 res |= S_ISGID;
111
112 if ((mode & P9_DMSETVTX) == P9_DMSETVTX)
113 res |= S_ISVTX;
114 }
115 return res;
116}
117
118/**
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700119 * p9mode2unixmode- convert plan9 mode bits to unix mode bits
120 * @v9ses: v9fs session information
Aneesh Kumar K.V45089142011-07-25 18:06:33 +0000121 * @stat: p9_wstat from which mode need to be derived
122 * @rdev: major number, minor number in case of device files.
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700123 *
124 */
Al Viro3eda0de2011-07-26 02:53:22 -0400125static umode_t p9mode2unixmode(struct v9fs_session_info *v9ses,
126 struct p9_wstat *stat, dev_t *rdev)
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700127{
128 int res;
Al Viro3eda0de2011-07-26 02:53:22 -0400129 u32 mode = stat->mode;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700130
Aneesh Kumar K.V45089142011-07-25 18:06:33 +0000131 *rdev = 0;
Aneesh Kumar K.Vdf345c62012-01-05 13:39:49 +0530132 res = p9mode2perm(v9ses, stat);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700133
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500134 if ((mode & P9_DMDIR) == P9_DMDIR)
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700135 res |= S_IFDIR;
Sripathi Kodidd6102f2010-03-05 18:48:00 +0000136 else if ((mode & P9_DMSYMLINK) && (v9fs_proto_dotu(v9ses)))
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700137 res |= S_IFLNK;
Sripathi Kodidd6102f2010-03-05 18:48:00 +0000138 else if ((mode & P9_DMSOCKET) && (v9fs_proto_dotu(v9ses))
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700139 && (v9ses->nodev == 0))
140 res |= S_IFSOCK;
Sripathi Kodidd6102f2010-03-05 18:48:00 +0000141 else if ((mode & P9_DMNAMEDPIPE) && (v9fs_proto_dotu(v9ses))
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700142 && (v9ses->nodev == 0))
143 res |= S_IFIFO;
Sripathi Kodidd6102f2010-03-05 18:48:00 +0000144 else if ((mode & P9_DMDEVICE) && (v9fs_proto_dotu(v9ses))
Aneesh Kumar K.V45089142011-07-25 18:06:33 +0000145 && (v9ses->nodev == 0)) {
146 char type = 0, ext[32];
147 int major = -1, minor = -1;
148
Chen Gangb3f8ab42013-07-16 15:33:16 +0800149 strlcpy(ext, stat->extension, sizeof(ext));
Toralf Försterafe604d2014-04-26 19:28:13 +0200150 sscanf(ext, "%c %i %i", &type, &major, &minor);
Aneesh Kumar K.V45089142011-07-25 18:06:33 +0000151 switch (type) {
152 case 'c':
153 res |= S_IFCHR;
154 break;
155 case 'b':
156 res |= S_IFBLK;
157 break;
158 default:
Joe Perches5d385152011-11-28 10:40:46 -0800159 p9_debug(P9_DEBUG_ERROR, "Unknown special type %c %s\n",
160 type, stat->extension);
Aneesh Kumar K.V45089142011-07-25 18:06:33 +0000161 };
162 *rdev = MKDEV(major, minor);
163 } else
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700164 res |= S_IFREG;
165
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700166 return res;
167}
168
Eric Van Hensbergenee443992008-03-05 07:08:09 -0600169/**
170 * v9fs_uflags2omode- convert posix open flags to plan 9 mode bits
171 * @uflags: flags to convert
Eric Van Hensbergen2e4bef42008-06-24 17:39:39 -0500172 * @extended: if .u extensions are active
Eric Van Hensbergenee443992008-03-05 07:08:09 -0600173 */
174
Eric Van Hensbergen2e4bef42008-06-24 17:39:39 -0500175int v9fs_uflags2omode(int uflags, int extended)
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800176{
177 int ret;
178
179 ret = 0;
180 switch (uflags&3) {
181 default:
182 case O_RDONLY:
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500183 ret = P9_OREAD;
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800184 break;
185
186 case O_WRONLY:
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500187 ret = P9_OWRITE;
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800188 break;
189
190 case O_RDWR:
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500191 ret = P9_ORDWR;
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800192 break;
193 }
194
Eric Van Hensbergen2e4bef42008-06-24 17:39:39 -0500195 if (extended) {
196 if (uflags & O_EXCL)
197 ret |= P9_OEXCL;
198
199 if (uflags & O_APPEND)
200 ret |= P9_OAPPEND;
201 }
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800202
203 return ret;
204}
205
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700206/**
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800207 * v9fs_blank_wstat - helper function to setup a 9P stat structure
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800208 * @wstat: structure to initialize
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700209 *
210 */
211
M. Mohan Kumar7a4439c2010-02-08 15:36:48 -0600212void
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500213v9fs_blank_wstat(struct p9_wstat *wstat)
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700214{
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800215 wstat->type = ~0;
216 wstat->dev = ~0;
217 wstat->qid.type = ~0;
218 wstat->qid.version = ~0;
219 *((long long *)&wstat->qid.path) = ~0;
220 wstat->mode = ~0;
221 wstat->atime = ~0;
222 wstat->mtime = ~0;
223 wstat->length = ~0;
224 wstat->name = NULL;
225 wstat->uid = NULL;
226 wstat->gid = NULL;
227 wstat->muid = NULL;
Eric W. Biederman447c5092013-01-29 16:18:50 -0800228 wstat->n_uid = INVALID_UID;
229 wstat->n_gid = INVALID_GID;
230 wstat->n_muid = INVALID_UID;
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800231 wstat->extension = NULL;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700232}
233
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500234/**
235 * v9fs_alloc_inode - helper function to allocate an inode
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500236 *
237 */
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500238struct inode *v9fs_alloc_inode(struct super_block *sb)
239{
Aneesh Kumar K.Va78ce052011-02-28 17:04:02 +0530240 struct v9fs_inode *v9inode;
241 v9inode = (struct v9fs_inode *)kmem_cache_alloc(v9fs_inode_cache,
242 GFP_KERNEL);
243 if (!v9inode)
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500244 return NULL;
Aneesh Kumar K.Va78ce052011-02-28 17:04:02 +0530245#ifdef CONFIG_9P_FSCACHE
246 v9inode->fscache = NULL;
Aneesh Kumar K.Va78ce052011-02-28 17:04:02 +0530247 spin_lock_init(&v9inode->fscache_lock);
248#endif
Aneesh Kumar K.V6b39f6d2011-02-28 17:04:03 +0530249 v9inode->writeback_fid = NULL;
Aneesh Kumar K.Vb3cbea02011-02-28 17:04:06 +0530250 v9inode->cache_validity = 0;
Aneesh Kumar K.V5a7e0a82011-03-08 16:39:46 +0530251 mutex_init(&v9inode->v_mutex);
Aneesh Kumar K.Va78ce052011-02-28 17:04:02 +0530252 return &v9inode->vfs_inode;
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500253}
254
255/**
256 * v9fs_destroy_inode - destroy an inode
257 *
258 */
259
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100260static void v9fs_i_callback(struct rcu_head *head)
261{
262 struct inode *inode = container_of(head, struct inode, i_rcu);
Aneesh Kumar K.Va78ce052011-02-28 17:04:02 +0530263 kmem_cache_free(v9fs_inode_cache, V9FS_I(inode));
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100264}
265
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500266void v9fs_destroy_inode(struct inode *inode)
267{
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100268 call_rcu(&inode->i_rcu, v9fs_i_callback);
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500269}
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500270
Aneesh Kumar K.V5ffc0cb2011-02-28 17:04:01 +0530271int v9fs_init_inode(struct v9fs_session_info *v9ses,
Al Viro3eda0de2011-07-26 02:53:22 -0400272 struct inode *inode, umode_t mode, dev_t rdev)
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700273{
Aneesh Kumar K.V5ffc0cb2011-02-28 17:04:01 +0530274 int err = 0;
Abhishek Kulkarni2bb54112009-07-19 13:41:56 -0600275
Dmitry Monakhov217f2062010-03-04 17:30:57 +0300276 inode_init_owner(inode, NULL, mode);
Abhishek Kulkarni2bb54112009-07-19 13:41:56 -0600277 inode->i_blocks = 0;
Aneesh Kumar K.V45089142011-07-25 18:06:33 +0000278 inode->i_rdev = rdev;
Abhishek Kulkarni2bb54112009-07-19 13:41:56 -0600279 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
280 inode->i_mapping->a_ops = &v9fs_addr_operations;
281
282 switch (mode & S_IFMT) {
283 case S_IFIFO:
284 case S_IFBLK:
285 case S_IFCHR:
286 case S_IFSOCK:
M. Mohan Kumar4b435162010-06-16 14:27:01 +0530287 if (v9fs_proto_dotl(v9ses)) {
288 inode->i_op = &v9fs_file_inode_operations_dotl;
M. Mohan Kumar4b435162010-06-16 14:27:01 +0530289 } else if (v9fs_proto_dotu(v9ses)) {
290 inode->i_op = &v9fs_file_inode_operations;
M. Mohan Kumar4b435162010-06-16 14:27:01 +0530291 } else {
Joe Perches5d385152011-11-28 10:40:46 -0800292 p9_debug(P9_DEBUG_ERROR,
293 "special files without extended mode\n");
Abhishek Kulkarni2bb54112009-07-19 13:41:56 -0600294 err = -EINVAL;
295 goto error;
296 }
297 init_special_inode(inode, inode->i_mode, inode->i_rdev);
298 break;
299 case S_IFREG:
Sripathi Kodi9b6533c2010-03-25 12:41:54 +0000300 if (v9fs_proto_dotl(v9ses)) {
301 inode->i_op = &v9fs_file_inode_operations_dotl;
Dominique Martinetfb89b452014-01-10 13:44:09 +0100302 if (v9ses->cache == CACHE_LOOSE ||
303 v9ses->cache == CACHE_FSCACHE)
Aneesh Kumar K.V29236f42011-02-28 17:03:54 +0530304 inode->i_fop =
305 &v9fs_cached_file_operations_dotl;
Dominique Martinetfb89b452014-01-10 13:44:09 +0100306 else if (v9ses->cache == CACHE_MMAP)
307 inode->i_fop = &v9fs_mmap_file_operations_dotl;
Aneesh Kumar K.V29236f42011-02-28 17:03:54 +0530308 else
309 inode->i_fop = &v9fs_file_operations_dotl;
Sripathi Kodi9b6533c2010-03-25 12:41:54 +0000310 } else {
311 inode->i_op = &v9fs_file_inode_operations;
Dominique Martinetfb89b452014-01-10 13:44:09 +0100312 if (v9ses->cache == CACHE_LOOSE ||
313 v9ses->cache == CACHE_FSCACHE)
314 inode->i_fop =
315 &v9fs_cached_file_operations;
316 else if (v9ses->cache == CACHE_MMAP)
317 inode->i_fop = &v9fs_mmap_file_operations;
Aneesh Kumar K.V29236f42011-02-28 17:03:54 +0530318 else
319 inode->i_fop = &v9fs_file_operations;
Sripathi Kodi9b6533c2010-03-25 12:41:54 +0000320 }
321
Abhishek Kulkarni2bb54112009-07-19 13:41:56 -0600322 break;
323 case S_IFLNK:
Sripathi Kodi9b6533c2010-03-25 12:41:54 +0000324 if (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses)) {
Joe Perches5d385152011-11-28 10:40:46 -0800325 p9_debug(P9_DEBUG_ERROR,
326 "extended modes used with legacy protocol\n");
Abhishek Kulkarni2bb54112009-07-19 13:41:56 -0600327 err = -EINVAL;
328 goto error;
329 }
Sripathi Kodi9b6533c2010-03-25 12:41:54 +0000330
331 if (v9fs_proto_dotl(v9ses))
332 inode->i_op = &v9fs_symlink_inode_operations_dotl;
333 else
334 inode->i_op = &v9fs_symlink_inode_operations;
335
Abhishek Kulkarni2bb54112009-07-19 13:41:56 -0600336 break;
337 case S_IFDIR:
338 inc_nlink(inode);
Sripathi Kodi9b6533c2010-03-25 12:41:54 +0000339 if (v9fs_proto_dotl(v9ses))
340 inode->i_op = &v9fs_dir_inode_operations_dotl;
341 else if (v9fs_proto_dotu(v9ses))
342 inode->i_op = &v9fs_dir_inode_operations_dotu;
Abhishek Kulkarni2bb54112009-07-19 13:41:56 -0600343 else
344 inode->i_op = &v9fs_dir_inode_operations;
Sripathi Kodi9b6533c2010-03-25 12:41:54 +0000345
346 if (v9fs_proto_dotl(v9ses))
347 inode->i_fop = &v9fs_dir_operations_dotl;
348 else
349 inode->i_fop = &v9fs_dir_operations;
350
Abhishek Kulkarni2bb54112009-07-19 13:41:56 -0600351 break;
352 default:
Linus Torvalds609eac12012-01-10 15:09:01 -0800353 p9_debug(P9_DEBUG_ERROR, "BAD mode 0x%hx S_IFMT 0x%x\n",
Joe Perches5d385152011-11-28 10:40:46 -0800354 mode, mode & S_IFMT);
Abhishek Kulkarni2bb54112009-07-19 13:41:56 -0600355 err = -EINVAL;
356 goto error;
357 }
Abhishek Kulkarni2bb54112009-07-19 13:41:56 -0600358error:
Aneesh Kumar K.V5ffc0cb2011-02-28 17:04:01 +0530359 return err;
360
361}
362
363/**
364 * v9fs_get_inode - helper function to setup an inode
365 * @sb: superblock
366 * @mode: mode to setup inode with
367 *
368 */
369
Al Viro3eda0de2011-07-26 02:53:22 -0400370struct inode *v9fs_get_inode(struct super_block *sb, umode_t mode, dev_t rdev)
Aneesh Kumar K.V5ffc0cb2011-02-28 17:04:01 +0530371{
372 int err;
373 struct inode *inode;
374 struct v9fs_session_info *v9ses = sb->s_fs_info;
375
Linus Torvalds609eac12012-01-10 15:09:01 -0800376 p9_debug(P9_DEBUG_VFS, "super block: %p mode: %ho\n", sb, mode);
Aneesh Kumar K.V5ffc0cb2011-02-28 17:04:01 +0530377
378 inode = new_inode(sb);
379 if (!inode) {
Joe Perches5d385152011-11-28 10:40:46 -0800380 pr_warn("%s (%d): Problem allocating inode\n",
381 __func__, task_pid_nr(current));
Aneesh Kumar K.V5ffc0cb2011-02-28 17:04:01 +0530382 return ERR_PTR(-ENOMEM);
383 }
Aneesh Kumar K.V45089142011-07-25 18:06:33 +0000384 err = v9fs_init_inode(v9ses, inode, mode, rdev);
Aneesh Kumar K.V5ffc0cb2011-02-28 17:04:01 +0530385 if (err) {
386 iput(inode);
387 return ERR_PTR(err);
388 }
389 return inode;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700390}
391
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500392/*
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800393static struct v9fs_fid*
394v9fs_clone_walk(struct v9fs_session_info *v9ses, u32 fid, struct dentry *dentry)
395{
396 int err;
Mika Kukkonen736c4b82006-12-06 20:36:29 -0800397 int nfid;
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800398 struct v9fs_fid *ret;
399 struct v9fs_fcall *fcall;
400
401 nfid = v9fs_get_idpool(&v9ses->fidpool);
402 if (nfid < 0) {
403 eprintk(KERN_WARNING, "no free fids available\n");
Latchesar Ionkov731805b2006-03-07 21:55:42 -0800404 return ERR_PTR(-ENOSPC);
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800405 }
406
407 err = v9fs_t_walk(v9ses, fid, nfid, (char *) dentry->d_name.name,
408 &fcall);
409
410 if (err < 0) {
Latchesar Ionkov41e5a6a2006-05-15 09:44:21 -0700411 if (fcall && fcall->id == RWALK)
412 goto clunk_fid;
413
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800414 PRINT_FCALL_ERROR("walk error", fcall);
415 v9fs_put_idpool(nfid, &v9ses->fidpool);
416 goto error;
417 }
418
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700419 kfree(fcall);
Latchesar Ionkov3cf64292006-01-08 01:04:58 -0800420 fcall = NULL;
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800421 ret = v9fs_fid_create(v9ses, nfid);
422 if (!ret) {
423 err = -ENOMEM;
424 goto clunk_fid;
425 }
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700426
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800427 err = v9fs_fid_insert(ret, dentry);
428 if (err < 0) {
429 v9fs_fid_destroy(ret);
430 goto clunk_fid;
Latchesar Ionkov0b8dd172005-09-27 21:45:24 -0700431 }
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800432
433 return ret;
434
435clunk_fid:
436 v9fs_t_clunk(v9ses, nfid);
437
438error:
439 kfree(fcall);
440 return ERR_PTR(err);
441}
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500442*/
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800443
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500444
445/**
446 * v9fs_clear_inode - release an inode
447 * @inode: inode to release
448 *
449 */
Al Virob57922d2010-06-07 14:34:48 -0400450void v9fs_evict_inode(struct inode *inode)
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500451{
Aneesh Kumar K.V6b39f6d2011-02-28 17:04:03 +0530452 struct v9fs_inode *v9inode = V9FS_I(inode);
453
Johannes Weiner91b0abe2014-04-03 14:47:49 -0700454 truncate_inode_pages_final(inode->i_mapping);
Jan Karadbd57682012-05-03 14:48:02 +0200455 clear_inode(inode);
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500456 filemap_fdatawrite(inode->i_mapping);
457
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500458 v9fs_cache_inode_put_cookie(inode);
Aneesh Kumar K.V6b39f6d2011-02-28 17:04:03 +0530459 /* clunk the fid stashed in writeback_fid */
460 if (v9inode->writeback_fid) {
461 p9_client_clunk(v9inode->writeback_fid);
462 v9inode->writeback_fid = NULL;
Aneesh Kumar K.V3cf387d2011-02-28 17:03:57 +0530463 }
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500464}
465
Aneesh Kumar K.Vfd2421f2011-07-11 16:40:59 +0000466static int v9fs_test_inode(struct inode *inode, void *data)
467{
468 int umode;
Aneesh Kumar K.V45089142011-07-25 18:06:33 +0000469 dev_t rdev;
Aneesh Kumar K.Vfd2421f2011-07-11 16:40:59 +0000470 struct v9fs_inode *v9inode = V9FS_I(inode);
471 struct p9_wstat *st = (struct p9_wstat *)data;
472 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode);
473
Aneesh Kumar K.V45089142011-07-25 18:06:33 +0000474 umode = p9mode2unixmode(v9ses, st, &rdev);
Aneesh Kumar K.Vfd2421f2011-07-11 16:40:59 +0000475 /* don't match inode of different type */
476 if ((inode->i_mode & S_IFMT) != (umode & S_IFMT))
477 return 0;
478
479 /* compare qid details */
480 if (memcmp(&v9inode->qid.version,
481 &st->qid.version, sizeof(v9inode->qid.version)))
482 return 0;
483
484 if (v9inode->qid.type != st->qid.type)
485 return 0;
486 return 1;
487}
488
Aneesh Kumar K.Ved80fcf2011-07-06 16:32:31 +0530489static int v9fs_test_new_inode(struct inode *inode, void *data)
490{
491 return 0;
492}
493
Aneesh Kumar K.Vfd2421f2011-07-11 16:40:59 +0000494static int v9fs_set_inode(struct inode *inode, void *data)
495{
496 struct v9fs_inode *v9inode = V9FS_I(inode);
497 struct p9_wstat *st = (struct p9_wstat *)data;
498
499 memcpy(&v9inode->qid, &st->qid, sizeof(st->qid));
500 return 0;
501}
502
Aneesh Kumar K.V5ffc0cb2011-02-28 17:04:01 +0530503static struct inode *v9fs_qid_iget(struct super_block *sb,
504 struct p9_qid *qid,
Aneesh Kumar K.Ved80fcf2011-07-06 16:32:31 +0530505 struct p9_wstat *st,
506 int new)
Aneesh Kumar K.V5ffc0cb2011-02-28 17:04:01 +0530507{
Aneesh Kumar K.V45089142011-07-25 18:06:33 +0000508 dev_t rdev;
Al Viro3eda0de2011-07-26 02:53:22 -0400509 int retval;
510 umode_t umode;
Aneesh Kumar K.V5ffc0cb2011-02-28 17:04:01 +0530511 unsigned long i_ino;
512 struct inode *inode;
513 struct v9fs_session_info *v9ses = sb->s_fs_info;
Aneesh Kumar K.Ved80fcf2011-07-06 16:32:31 +0530514 int (*test)(struct inode *, void *);
515
516 if (new)
517 test = v9fs_test_new_inode;
518 else
519 test = v9fs_test_inode;
Aneesh Kumar K.V5ffc0cb2011-02-28 17:04:01 +0530520
521 i_ino = v9fs_qid2ino(qid);
Aneesh Kumar K.Ved80fcf2011-07-06 16:32:31 +0530522 inode = iget5_locked(sb, i_ino, test, v9fs_set_inode, st);
Aneesh Kumar K.V5ffc0cb2011-02-28 17:04:01 +0530523 if (!inode)
524 return ERR_PTR(-ENOMEM);
525 if (!(inode->i_state & I_NEW))
526 return inode;
527 /*
528 * initialize the inode with the stat info
529 * FIXME!! we may need support for stale inodes
530 * later.
531 */
Aneesh Kumar K.Vfd2421f2011-07-11 16:40:59 +0000532 inode->i_ino = i_ino;
Aneesh Kumar K.V45089142011-07-25 18:06:33 +0000533 umode = p9mode2unixmode(v9ses, st, &rdev);
534 retval = v9fs_init_inode(v9ses, inode, umode, rdev);
Aneesh Kumar K.V5ffc0cb2011-02-28 17:04:01 +0530535 if (retval)
536 goto error;
537
538 v9fs_stat2inode(st, inode, sb);
Aneesh Kumar K.V5ffc0cb2011-02-28 17:04:01 +0530539 v9fs_cache_inode_get_cookie(inode);
Aneesh Kumar K.V5ffc0cb2011-02-28 17:04:01 +0530540 unlock_new_inode(inode);
541 return inode;
542error:
543 unlock_new_inode(inode);
544 iput(inode);
545 return ERR_PTR(retval);
546
547}
548
Aneesh Kumar K.V53c06f42011-01-10 13:51:47 -0600549struct inode *
Aneesh Kumar K.Va78ce052011-02-28 17:04:02 +0530550v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid,
Aneesh Kumar K.Ved80fcf2011-07-06 16:32:31 +0530551 struct super_block *sb, int new)
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800552{
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500553 struct p9_wstat *st;
Aneesh Kumar K.V5ffc0cb2011-02-28 17:04:01 +0530554 struct inode *inode = NULL;
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800555
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500556 st = p9_client_stat(fid);
Abhishek Kulkarni02bc3562009-07-19 13:41:54 -0600557 if (IS_ERR(st))
558 return ERR_CAST(st);
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800559
Aneesh Kumar K.Ved80fcf2011-07-06 16:32:31 +0530560 inode = v9fs_qid_iget(sb, &st->qid, st, new);
Abhishek Kulkarni02bc3562009-07-19 13:41:54 -0600561 p9stat_free(st);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500562 kfree(st);
Aneesh Kumar K.V5ffc0cb2011-02-28 17:04:01 +0530563 return inode;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700564}
565
566/**
Aneesh Kumar K.Vf88657c2011-08-03 19:55:32 +0530567 * v9fs_at_to_dotl_flags- convert Linux specific AT flags to
568 * plan 9 AT flag.
569 * @flags: flags to convert
570 */
571static int v9fs_at_to_dotl_flags(int flags)
572{
573 int rflags = 0;
574 if (flags & AT_REMOVEDIR)
575 rflags |= P9_DOTL_AT_REMOVEDIR;
576 return rflags;
577}
578
579/**
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700580 * v9fs_remove - helper function to remove files and directories
Eric Van Hensbergen73c592b2005-09-09 13:04:26 -0700581 * @dir: directory inode that is being deleted
Aneesh Kumar K.V48e370f2011-06-28 15:41:18 +0530582 * @dentry: dentry that is being deleted
Fabian Frederickfd2916b2014-06-04 16:06:26 -0700583 * @flags: removing a directory
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700584 *
585 */
586
Aneesh Kumar K.V48e370f2011-06-28 15:41:18 +0530587static int v9fs_remove(struct inode *dir, struct dentry *dentry, int flags)
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700588{
Aneesh Kumar K.V48e370f2011-06-28 15:41:18 +0530589 struct inode *inode;
590 int retval = -EOPNOTSUPP;
591 struct p9_fid *v9fid, *dfid;
592 struct v9fs_session_info *v9ses;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700593
Joe Perches5d385152011-11-28 10:40:46 -0800594 p9_debug(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %x\n",
595 dir, dentry, flags);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700596
Aneesh Kumar K.V48e370f2011-06-28 15:41:18 +0530597 v9ses = v9fs_inode2v9ses(dir);
David Howells2b0143b2015-03-17 22:25:59 +0000598 inode = d_inode(dentry);
Aneesh Kumar K.V48e370f2011-06-28 15:41:18 +0530599 dfid = v9fs_fid_lookup(dentry->d_parent);
600 if (IS_ERR(dfid)) {
601 retval = PTR_ERR(dfid);
Joe Perches5d385152011-11-28 10:40:46 -0800602 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", retval);
Aneesh Kumar K.V48e370f2011-06-28 15:41:18 +0530603 return retval;
604 }
605 if (v9fs_proto_dotl(v9ses))
Aneesh Kumar K.Vf88657c2011-08-03 19:55:32 +0530606 retval = p9_client_unlinkat(dfid, dentry->d_name.name,
607 v9fs_at_to_dotl_flags(flags));
Aneesh Kumar K.V48e370f2011-06-28 15:41:18 +0530608 if (retval == -EOPNOTSUPP) {
609 /* Try the one based on path */
610 v9fid = v9fs_fid_clone(dentry);
611 if (IS_ERR(v9fid))
612 return PTR_ERR(v9fid);
613 retval = p9_client_remove(v9fid);
614 }
Aneesh Kumar K.Vb271ec42011-02-28 17:04:05 +0530615 if (!retval) {
616 /*
617 * directories on unlink should have zero
618 * link count
619 */
Aneesh Kumar K.V48e370f2011-06-28 15:41:18 +0530620 if (flags & AT_REMOVEDIR) {
621 clear_nlink(inode);
Aneesh Kumar K.Vb271ec42011-02-28 17:04:05 +0530622 drop_nlink(dir);
623 } else
Aneesh Kumar K.V48e370f2011-06-28 15:41:18 +0530624 drop_nlink(inode);
Aneesh Kumar K.Vd28c61f2011-02-28 17:04:08 +0530625
Aneesh Kumar K.V48e370f2011-06-28 15:41:18 +0530626 v9fs_invalidate_inode_attr(inode);
Aneesh Kumar K.Vd28c61f2011-02-28 17:04:08 +0530627 v9fs_invalidate_inode_attr(dir);
Aneesh Kumar K.Vb271ec42011-02-28 17:04:05 +0530628 }
Aneesh Kumar K.Vd994f402010-03-29 18:14:50 -0500629 return retval;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700630}
631
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500632/**
633 * v9fs_create - Create a file
Eric Van Hensbergenee443992008-03-05 07:08:09 -0600634 * @v9ses: session information
635 * @dir: directory that dentry is being created in
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500636 * @dentry: dentry that is being created
Abhishek Kulkarni0e155972009-07-19 13:41:55 -0600637 * @extension: 9p2000.u extension string to support devices, etc.
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500638 * @perm: create permissions
639 * @mode: open mode
640 *
641 */
642static struct p9_fid *
643v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir,
644 struct dentry *dentry, char *extension, u32 perm, u8 mode)
645{
646 int err;
647 char *name;
648 struct p9_fid *dfid, *ofid, *fid;
649 struct inode *inode;
650
Al Viro4b8e9922014-08-19 20:17:38 -0400651 p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry);
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500652
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500653 err = 0;
654 ofid = NULL;
655 fid = NULL;
656 name = (char *) dentry->d_name.name;
Venkateswararao Jujjuri6d27e642010-05-10 18:08:28 +0000657 dfid = v9fs_fid_lookup(dentry->d_parent);
Latchesar Ionkovba176742007-10-17 14:31:07 -0500658 if (IS_ERR(dfid)) {
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500659 err = PTR_ERR(dfid);
Joe Perches5d385152011-11-28 10:40:46 -0800660 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
Venkateswararao Jujjuri6d27e642010-05-10 18:08:28 +0000661 return ERR_PTR(err);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500662 }
663
664 /* clone a fid to use for creation */
665 ofid = p9_client_walk(dfid, 0, NULL, 1);
666 if (IS_ERR(ofid)) {
667 err = PTR_ERR(ofid);
Joe Perches5d385152011-11-28 10:40:46 -0800668 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
Venkateswararao Jujjuri6d27e642010-05-10 18:08:28 +0000669 return ERR_PTR(err);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500670 }
671
672 err = p9_client_fcreate(ofid, name, perm, mode, extension);
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500673 if (err < 0) {
Joe Perches5d385152011-11-28 10:40:46 -0800674 p9_debug(P9_DEBUG_VFS, "p9_client_fcreate failed %d\n", err);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500675 goto error;
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500676 }
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500677
Aneesh Kumar K.Vb6054792012-01-05 10:42:17 -0600678 if (!(perm & P9_DMLINK)) {
679 /* now walk from the parent so we can get unopened fid */
680 fid = p9_client_walk(dfid, 1, &name, 1);
681 if (IS_ERR(fid)) {
682 err = PTR_ERR(fid);
683 p9_debug(P9_DEBUG_VFS,
684 "p9_client_walk failed %d\n", err);
685 fid = NULL;
686 goto error;
687 }
688 /*
689 * instantiate inode and assign the unopened fid to the dentry
690 */
691 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
692 if (IS_ERR(inode)) {
693 err = PTR_ERR(inode);
694 p9_debug(P9_DEBUG_VFS,
695 "inode creation failed %d\n", err);
696 goto error;
697 }
Al Viro2ea03e1d2013-02-28 01:18:14 -0500698 v9fs_fid_add(dentry, fid);
Aneesh Kumar K.Vb6054792012-01-05 10:42:17 -0600699 d_instantiate(dentry, inode);
Venkateswararao Jujjuri6d27e642010-05-10 18:08:28 +0000700 }
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500701 return ofid;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500702error:
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500703 if (ofid)
704 p9_client_clunk(ofid);
705
706 if (fid)
707 p9_client_clunk(fid);
708
709 return ERR_PTR(err);
710}
711
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700712/**
Miklos Szeredie43ae792012-06-05 15:10:26 +0200713 * v9fs_vfs_create - VFS hook to create a regular file
714 *
715 * open(.., O_CREAT) is handled in v9fs_vfs_atomic_open(). This is only called
716 * for mknod(2).
717 *
Eric Van Hensbergenee443992008-03-05 07:08:09 -0600718 * @dir: directory inode that is being created
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700719 * @dentry: dentry that is being deleted
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800720 * @mode: create permissions
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700721 *
722 */
723
724static int
Al Viro4acdaf22011-07-26 01:42:34 -0400725v9fs_vfs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
Al Viroebfc3b42012-06-10 18:05:36 -0400726 bool excl)
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700727{
Miklos Szeredie43ae792012-06-05 15:10:26 +0200728 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir);
729 u32 perm = unixmode2p9mode(v9ses, mode);
730 struct p9_fid *fid;
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800731
Miklos Szeredie43ae792012-06-05 15:10:26 +0200732 /* P9_OEXCL? */
733 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_ORDWR);
734 if (IS_ERR(fid))
735 return PTR_ERR(fid);
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800736
Aneesh Kumar K.Vd28c61f2011-02-28 17:04:08 +0530737 v9fs_invalidate_inode_attr(dir);
Miklos Szeredie43ae792012-06-05 15:10:26 +0200738 p9_client_clunk(fid);
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800739
740 return 0;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700741}
742
743/**
744 * v9fs_vfs_mkdir - VFS mkdir hook to create a directory
Eric Van Hensbergenee443992008-03-05 07:08:09 -0600745 * @dir: inode that is being unlinked
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700746 * @dentry: dentry that is being unlinked
747 * @mode: mode for new directory
748 *
749 */
750
Al Viro18bb1db2011-07-26 01:41:39 -0400751static int v9fs_vfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700752{
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800753 int err;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500754 u32 perm;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500755 struct p9_fid *fid;
Aneesh Kumar K.Vd28c61f2011-02-28 17:04:08 +0530756 struct v9fs_session_info *v9ses;
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800757
Al Viro4b8e9922014-08-19 20:17:38 -0400758 p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500759 err = 0;
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800760 v9ses = v9fs_inode2v9ses(dir);
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800761 perm = unixmode2p9mode(v9ses, mode | S_IFDIR);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500762 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_OREAD);
763 if (IS_ERR(fid)) {
764 err = PTR_ERR(fid);
765 fid = NULL;
Aneesh Kumar K.Vd28c61f2011-02-28 17:04:08 +0530766 } else {
Aneesh Kumar K.Vb271ec42011-02-28 17:04:05 +0530767 inc_nlink(dir);
Aneesh Kumar K.Vd28c61f2011-02-28 17:04:08 +0530768 v9fs_invalidate_inode_attr(dir);
769 }
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800770
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500771 if (fid)
772 p9_client_clunk(fid);
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800773
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800774 return err;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700775}
776
777/**
778 * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode
779 * @dir: inode that is being walked from
780 * @dentry: dentry that is being walked to?
Fabian Frederickfd2916b2014-06-04 16:06:26 -0700781 * @flags: lookup flags (unused)
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700782 *
783 */
784
Aneesh Kumar K.V53c06f42011-01-10 13:51:47 -0600785struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry,
Al Viro00cd8dd2012-06-10 17:13:09 -0400786 unsigned int flags)
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700787{
Aneesh Kumar K.V73f50712011-08-16 22:19:28 +0530788 struct dentry *res;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700789 struct v9fs_session_info *v9ses;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500790 struct p9_fid *dfid, *fid;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700791 struct inode *inode;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500792 char *name;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700793
Al Viro4b8e9922014-08-19 20:17:38 -0400794 p9_debug(P9_DEBUG_VFS, "dir: %p dentry: (%pd) %p flags: %x\n",
795 dir, dentry, dentry, flags);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700796
Sripathi Kodi11e9b492010-03-29 18:13:59 -0500797 if (dentry->d_name.len > NAME_MAX)
798 return ERR_PTR(-ENAMETOOLONG);
799
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700800 v9ses = v9fs_inode2v9ses(dir);
Aneesh Kumar K.Va534c8d2010-06-30 19:18:50 +0530801 /* We can walk d_parent because we hold the dir->i_mutex */
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500802 dfid = v9fs_fid_lookup(dentry->d_parent);
803 if (IS_ERR(dfid))
David Howellse231c2e2008-02-07 00:15:26 -0800804 return ERR_CAST(dfid);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700805
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500806 name = (char *) dentry->d_name.name;
807 fid = p9_client_walk(dfid, 1, &name, 1);
808 if (IS_ERR(fid)) {
Al Viro7b5be622013-02-28 01:28:21 -0500809 if (fid == ERR_PTR(-ENOENT)) {
810 d_add(dentry, NULL);
811 return NULL;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700812 }
Al Viro7b5be622013-02-28 01:28:21 -0500813 return ERR_CAST(fid);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700814 }
Aneesh Kumar K.V73f50712011-08-16 22:19:28 +0530815 /*
816 * Make sure we don't use a wrong inode due to parallel
817 * unlink. For cached mode create calls request for new
818 * inode. But with cache disabled, lookup should do this.
819 */
Dominique Martinetfb89b452014-01-10 13:44:09 +0100820 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
Aneesh Kumar K.V73f50712011-08-16 22:19:28 +0530821 inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb);
822 else
823 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500824 if (IS_ERR(inode)) {
Al Viro7b5be622013-02-28 01:28:21 -0500825 p9_client_clunk(fid);
826 return ERR_CAST(inode);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700827 }
Aneesh Kumar K.V73f50712011-08-16 22:19:28 +0530828 /*
829 * If we had a rename on the server and a parallel lookup
830 * for the new name, then make sure we instantiate with
831 * the new name. ie look up for a/b, while on server somebody
832 * moved b under k and client parallely did a lookup for
833 * k/b.
834 */
Al Viro41d28bc2014-10-12 22:24:21 -0400835 res = d_splice_alias(inode, dentry);
Al Viroa3b21572013-02-28 01:29:48 -0500836 if (!res)
837 v9fs_fid_add(dentry, fid);
838 else if (!IS_ERR(res))
839 v9fs_fid_add(res, fid);
840 else
Al Viro7b5be622013-02-28 01:28:21 -0500841 p9_client_clunk(fid);
842 return res;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700843}
844
Al Virod9585272012-06-22 12:39:14 +0400845static int
Miklos Szeredie43ae792012-06-05 15:10:26 +0200846v9fs_vfs_atomic_open(struct inode *dir, struct dentry *dentry,
Al Viro30d90492012-06-22 12:40:19 +0400847 struct file *file, unsigned flags, umode_t mode,
Al Viro47237682012-06-10 05:01:45 -0400848 int *opened)
Miklos Szeredie43ae792012-06-05 15:10:26 +0200849{
850 int err;
851 u32 perm;
Miklos Szeredie43ae792012-06-05 15:10:26 +0200852 struct v9fs_inode *v9inode;
853 struct v9fs_session_info *v9ses;
854 struct p9_fid *fid, *inode_fid;
855 struct dentry *res = NULL;
856
857 if (d_unhashed(dentry)) {
Al Viro00cd8dd2012-06-10 17:13:09 -0400858 res = v9fs_vfs_lookup(dir, dentry, 0);
Miklos Szeredie43ae792012-06-05 15:10:26 +0200859 if (IS_ERR(res))
Al Virod9585272012-06-22 12:39:14 +0400860 return PTR_ERR(res);
Miklos Szeredie43ae792012-06-05 15:10:26 +0200861
862 if (res)
863 dentry = res;
864 }
865
866 /* Only creates */
David Howells2b0143b2015-03-17 22:25:59 +0000867 if (!(flags & O_CREAT) || d_really_is_positive(dentry))
Al Viroe45198a2012-06-10 06:48:09 -0400868 return finish_no_open(file, res);
Miklos Szeredie43ae792012-06-05 15:10:26 +0200869
870 err = 0;
Geyslan G. Bemfae74692013-09-28 20:32:15 -0300871
Miklos Szeredie43ae792012-06-05 15:10:26 +0200872 v9ses = v9fs_inode2v9ses(dir);
873 perm = unixmode2p9mode(v9ses, mode);
874 fid = v9fs_create(v9ses, dir, dentry, NULL, perm,
875 v9fs_uflags2omode(flags,
876 v9fs_proto_dotu(v9ses)));
877 if (IS_ERR(fid)) {
878 err = PTR_ERR(fid);
879 fid = NULL;
880 goto error;
881 }
882
883 v9fs_invalidate_inode_attr(dir);
David Howells2b0143b2015-03-17 22:25:59 +0000884 v9inode = V9FS_I(d_inode(dentry));
Miklos Szeredie43ae792012-06-05 15:10:26 +0200885 mutex_lock(&v9inode->v_mutex);
Dominique Martinetfb89b452014-01-10 13:44:09 +0100886 if ((v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) &&
887 !v9inode->writeback_fid &&
Miklos Szeredie43ae792012-06-05 15:10:26 +0200888 ((flags & O_ACCMODE) != O_RDONLY)) {
889 /*
890 * clone a fid and add it to writeback_fid
891 * we do it during open time instead of
892 * page dirty time via write_begin/page_mkwrite
893 * because we want write after unlink usecase
894 * to work.
895 */
896 inode_fid = v9fs_writeback_fid(dentry);
897 if (IS_ERR(inode_fid)) {
898 err = PTR_ERR(inode_fid);
899 mutex_unlock(&v9inode->v_mutex);
900 goto error;
901 }
902 v9inode->writeback_fid = (void *) inode_fid;
903 }
904 mutex_unlock(&v9inode->v_mutex);
Al Viro30d90492012-06-22 12:40:19 +0400905 err = finish_open(file, dentry, generic_file_open, opened);
906 if (err)
Miklos Szeredie43ae792012-06-05 15:10:26 +0200907 goto error;
Miklos Szeredie43ae792012-06-05 15:10:26 +0200908
Al Viro30d90492012-06-22 12:40:19 +0400909 file->private_data = fid;
Dominique Martinetfb89b452014-01-10 13:44:09 +0100910 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
David Howells2b0143b2015-03-17 22:25:59 +0000911 v9fs_cache_inode_set_cookie(d_inode(dentry), file);
Miklos Szeredie43ae792012-06-05 15:10:26 +0200912
Al Viro47237682012-06-10 05:01:45 -0400913 *opened |= FILE_CREATED;
Miklos Szeredie43ae792012-06-05 15:10:26 +0200914out:
915 dput(res);
Al Virod9585272012-06-22 12:39:14 +0400916 return err;
Miklos Szeredie43ae792012-06-05 15:10:26 +0200917
918error:
919 if (fid)
920 p9_client_clunk(fid);
Miklos Szeredie43ae792012-06-05 15:10:26 +0200921 goto out;
922}
923
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700924/**
925 * v9fs_vfs_unlink - VFS unlink hook to delete an inode
926 * @i: inode that is being unlinked
Eric Van Hensbergen73c592b2005-09-09 13:04:26 -0700927 * @d: dentry that is being unlinked
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700928 *
929 */
930
Aneesh Kumar K.V53c06f42011-01-10 13:51:47 -0600931int v9fs_vfs_unlink(struct inode *i, struct dentry *d)
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700932{
933 return v9fs_remove(i, d, 0);
934}
935
936/**
937 * v9fs_vfs_rmdir - VFS unlink hook to delete a directory
938 * @i: inode that is being unlinked
Eric Van Hensbergen73c592b2005-09-09 13:04:26 -0700939 * @d: dentry that is being unlinked
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700940 *
941 */
942
Aneesh Kumar K.V53c06f42011-01-10 13:51:47 -0600943int v9fs_vfs_rmdir(struct inode *i, struct dentry *d)
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700944{
Aneesh Kumar K.V48e370f2011-06-28 15:41:18 +0530945 return v9fs_remove(i, d, AT_REMOVEDIR);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700946}
947
948/**
949 * v9fs_vfs_rename - VFS hook to rename an inode
950 * @old_dir: old dir inode
951 * @old_dentry: old dentry
952 * @new_dir: new dir inode
953 * @new_dentry: new dentry
954 *
955 */
956
Aneesh Kumar K.V53c06f42011-01-10 13:51:47 -0600957int
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700958v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry,
959 struct inode *new_dir, struct dentry *new_dentry)
960{
Aneesh Kumar K.Vd28c61f2011-02-28 17:04:08 +0530961 int retval;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500962 struct inode *old_inode;
Aneesh Kumar K.Vb271ec42011-02-28 17:04:05 +0530963 struct inode *new_inode;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500964 struct v9fs_session_info *v9ses;
965 struct p9_fid *oldfid;
966 struct p9_fid *olddirfid;
967 struct p9_fid *newdirfid;
968 struct p9_wstat wstat;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700969
Joe Perches5d385152011-11-28 10:40:46 -0800970 p9_debug(P9_DEBUG_VFS, "\n");
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500971 retval = 0;
David Howells2b0143b2015-03-17 22:25:59 +0000972 old_inode = d_inode(old_dentry);
973 new_inode = d_inode(new_dentry);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500974 v9ses = v9fs_inode2v9ses(old_inode);
975 oldfid = v9fs_fid_lookup(old_dentry);
Latchesar Ionkovba176742007-10-17 14:31:07 -0500976 if (IS_ERR(oldfid))
Eric Van Hensbergenda977b22007-01-26 00:57:06 -0800977 return PTR_ERR(oldfid);
978
979 olddirfid = v9fs_fid_clone(old_dentry->d_parent);
Latchesar Ionkovba176742007-10-17 14:31:07 -0500980 if (IS_ERR(olddirfid)) {
Eric Van Hensbergenda977b22007-01-26 00:57:06 -0800981 retval = PTR_ERR(olddirfid);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500982 goto done;
Eric Van Hensbergenda977b22007-01-26 00:57:06 -0800983 }
984
985 newdirfid = v9fs_fid_clone(new_dentry->d_parent);
Latchesar Ionkovba176742007-10-17 14:31:07 -0500986 if (IS_ERR(newdirfid)) {
Eric Van Hensbergenda977b22007-01-26 00:57:06 -0800987 retval = PTR_ERR(newdirfid);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500988 goto clunk_olddir;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700989 }
990
Aneesh Kumar K.Va534c8d2010-06-30 19:18:50 +0530991 down_write(&v9ses->rename_sem);
Sripathi Kodi4681dbd2010-03-25 12:47:26 +0000992 if (v9fs_proto_dotl(v9ses)) {
Aneesh Kumar K.V9e8fb382011-06-28 15:41:16 +0530993 retval = p9_client_renameat(olddirfid, old_dentry->d_name.name,
994 newdirfid, new_dentry->d_name.name);
995 if (retval == -EOPNOTSUPP)
996 retval = p9_client_rename(oldfid, newdirfid,
997 new_dentry->d_name.name);
998 if (retval != -EOPNOTSUPP)
Sripathi Kodi4681dbd2010-03-25 12:47:26 +0000999 goto clunk_newdir;
1000 }
Aneesh Kumar K.Va534c8d2010-06-30 19:18:50 +05301001 if (old_dentry->d_parent != new_dentry->d_parent) {
1002 /*
1003 * 9P .u can only handle file rename in the same directory
1004 */
Sripathi Kodi4681dbd2010-03-25 12:47:26 +00001005
Joe Perches5d385152011-11-28 10:40:46 -08001006 p9_debug(P9_DEBUG_ERROR, "old dir and new dir are different\n");
Eric Van Hensbergen621997c2007-01-26 00:57:04 -08001007 retval = -EXDEV;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001008 goto clunk_newdir;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001009 }
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001010 v9fs_blank_wstat(&wstat);
Latchesar Ionkovba176742007-10-17 14:31:07 -05001011 wstat.muid = v9ses->uname;
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001012 wstat.name = (char *) new_dentry->d_name.name;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001013 retval = p9_client_wstat(oldfid, &wstat);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001014
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001015clunk_newdir:
Aneesh Kumar K.Vb271ec42011-02-28 17:04:05 +05301016 if (!retval) {
1017 if (new_inode) {
1018 if (S_ISDIR(new_inode->i_mode))
1019 clear_nlink(new_inode);
1020 else
1021 drop_nlink(new_inode);
1022 }
1023 if (S_ISDIR(old_inode->i_mode)) {
1024 if (!new_inode)
1025 inc_nlink(new_dir);
1026 drop_nlink(old_dir);
1027 }
Aneesh Kumar K.V3bc86de2011-02-28 17:04:07 +05301028 v9fs_invalidate_inode_attr(old_inode);
Aneesh Kumar K.Vd28c61f2011-02-28 17:04:08 +05301029 v9fs_invalidate_inode_attr(old_dir);
1030 v9fs_invalidate_inode_attr(new_dir);
Aneesh Kumar K.V3bc86de2011-02-28 17:04:07 +05301031
Aneesh Kumar K.Va534c8d2010-06-30 19:18:50 +05301032 /* successful rename */
1033 d_move(old_dentry, new_dentry);
Aneesh Kumar K.Vb271ec42011-02-28 17:04:05 +05301034 }
Aneesh Kumar K.Va534c8d2010-06-30 19:18:50 +05301035 up_write(&v9ses->rename_sem);
Latchesar Ionkov22150c42007-10-23 13:48:33 -05001036 p9_client_clunk(newdirfid);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001037
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001038clunk_olddir:
Latchesar Ionkov22150c42007-10-23 13:48:33 -05001039 p9_client_clunk(olddirfid);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001040
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001041done:
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001042 return retval;
1043}
1044
1045/**
Adrian Bunk943ffb52006-01-10 00:10:13 +01001046 * v9fs_vfs_getattr - retrieve file metadata
Eric Van Hensbergenee443992008-03-05 07:08:09 -06001047 * @mnt: mount information
1048 * @dentry: file to get attributes on
1049 * @stat: metadata structure to populate
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001050 *
1051 */
1052
1053static int
1054v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1055 struct kstat *stat)
1056{
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001057 struct v9fs_session_info *v9ses;
1058 struct p9_fid *fid;
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001059 struct p9_wstat *st;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001060
Joe Perches5d385152011-11-28 10:40:46 -08001061 p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry);
Aneesh Kumar K.V42869c82011-03-08 16:39:50 +05301062 v9ses = v9fs_dentry2v9ses(dentry);
Aneesh Kumar K.Va1211902011-02-28 17:04:01 +05301063 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
David Howells2b0143b2015-03-17 22:25:59 +00001064 generic_fillattr(d_inode(dentry), stat);
Aneesh Kumar K.Va1211902011-02-28 17:04:01 +05301065 return 0;
1066 }
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001067 fid = v9fs_fid_lookup(dentry);
1068 if (IS_ERR(fid))
Eric Van Hensbergenda977b22007-01-26 00:57:06 -08001069 return PTR_ERR(fid);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001070
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001071 st = p9_client_stat(fid);
1072 if (IS_ERR(st))
1073 return PTR_ERR(st);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001074
David Howells2b0143b2015-03-17 22:25:59 +00001075 v9fs_stat2inode(st, d_inode(dentry), d_inode(dentry)->i_sb);
1076 generic_fillattr(d_inode(dentry), stat);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001077
Latchesar Ionkov62b2be52010-08-24 18:13:59 +00001078 p9stat_free(st);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001079 kfree(st);
1080 return 0;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001081}
1082
1083/**
1084 * v9fs_vfs_setattr - set file metadata
1085 * @dentry: file whose metadata to set
1086 * @iattr: metadata assignment structure
1087 *
1088 */
1089
1090static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr)
1091{
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001092 int retval;
1093 struct v9fs_session_info *v9ses;
1094 struct p9_fid *fid;
1095 struct p9_wstat wstat;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001096
Joe Perches5d385152011-11-28 10:40:46 -08001097 p9_debug(P9_DEBUG_VFS, "\n");
David Howells2b0143b2015-03-17 22:25:59 +00001098 retval = inode_change_ok(d_inode(dentry), iattr);
Aneesh Kumar K.V059c1382011-03-08 16:39:48 +05301099 if (retval)
1100 return retval;
1101
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001102 retval = -EPERM;
Aneesh Kumar K.V42869c82011-03-08 16:39:50 +05301103 v9ses = v9fs_dentry2v9ses(dentry);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001104 fid = v9fs_fid_lookup(dentry);
Eric Van Hensbergenda977b22007-01-26 00:57:06 -08001105 if(IS_ERR(fid))
1106 return PTR_ERR(fid);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001107
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001108 v9fs_blank_wstat(&wstat);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001109 if (iattr->ia_valid & ATTR_MODE)
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001110 wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001111
1112 if (iattr->ia_valid & ATTR_MTIME)
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001113 wstat.mtime = iattr->ia_mtime.tv_sec;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001114
1115 if (iattr->ia_valid & ATTR_ATIME)
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001116 wstat.atime = iattr->ia_atime.tv_sec;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001117
1118 if (iattr->ia_valid & ATTR_SIZE)
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001119 wstat.length = iattr->ia_size;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001120
Sripathi Kodidd6102f2010-03-05 18:48:00 +00001121 if (v9fs_proto_dotu(v9ses)) {
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001122 if (iattr->ia_valid & ATTR_UID)
1123 wstat.n_uid = iattr->ia_uid;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001124
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001125 if (iattr->ia_valid & ATTR_GID)
1126 wstat.n_gid = iattr->ia_gid;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001127 }
Aneesh Kumar K.V059c1382011-03-08 16:39:48 +05301128
Aneesh Kumar K.V3dc54362011-02-28 17:04:11 +05301129 /* Write all dirty data */
David Howellse36cb0b2015-01-29 12:02:35 +00001130 if (d_is_reg(dentry))
David Howells2b0143b2015-03-17 22:25:59 +00001131 filemap_write_and_wait(d_inode(dentry)->i_mapping);
Aneesh Kumar K.V3dc54362011-02-28 17:04:11 +05301132
Aneesh Kumar K.Vf10fc502011-02-28 17:04:10 +05301133 retval = p9_client_wstat(fid, &wstat);
1134 if (retval < 0)
1135 return retval;
Aneesh Kumar K.V059c1382011-03-08 16:39:48 +05301136
1137 if ((iattr->ia_valid & ATTR_SIZE) &&
David Howells2b0143b2015-03-17 22:25:59 +00001138 iattr->ia_size != i_size_read(d_inode(dentry)))
1139 truncate_setsize(d_inode(dentry), iattr->ia_size);
Aneesh Kumar K.V059c1382011-03-08 16:39:48 +05301140
David Howells2b0143b2015-03-17 22:25:59 +00001141 v9fs_invalidate_inode_attr(d_inode(dentry));
Christoph Hellwig10257742010-06-04 11:30:02 +02001142
David Howells2b0143b2015-03-17 22:25:59 +00001143 setattr_copy(d_inode(dentry), iattr);
1144 mark_inode_dirty(d_inode(dentry));
Christoph Hellwig10257742010-06-04 11:30:02 +02001145 return 0;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001146}
1147
1148/**
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001149 * v9fs_stat2inode - populate an inode structure with mistat info
1150 * @stat: Plan 9 metadata (mistat) structure
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001151 * @inode: inode to populate
1152 * @sb: superblock of filesystem
1153 *
1154 */
1155
1156void
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001157v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode,
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001158 struct super_block *sb)
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001159{
Al Viro3eda0de2011-07-26 02:53:22 -04001160 umode_t mode;
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001161 char ext[32];
Aneesh Kumar K.V57171442010-03-05 14:43:43 -06001162 char tag_name[14];
1163 unsigned int i_nlink;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001164 struct v9fs_session_info *v9ses = sb->s_fs_info;
Aneesh Kumar K.Vb3cbea02011-02-28 17:04:06 +05301165 struct v9fs_inode *v9inode = V9FS_I(inode);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001166
Miklos Szeredibfe86842011-10-28 14:13:29 +02001167 set_nlink(inode, 1);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001168
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001169 inode->i_atime.tv_sec = stat->atime;
1170 inode->i_mtime.tv_sec = stat->mtime;
1171 inode->i_ctime.tv_sec = stat->mtime;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001172
Latchesar Ionkovbd32b822007-10-17 14:31:07 -05001173 inode->i_uid = v9ses->dfltuid;
1174 inode->i_gid = v9ses->dfltgid;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001175
Sripathi Kodidd6102f2010-03-05 18:48:00 +00001176 if (v9fs_proto_dotu(v9ses)) {
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001177 inode->i_uid = stat->n_uid;
1178 inode->i_gid = stat->n_gid;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001179 }
Aneesh Kumar K.V57171442010-03-05 14:43:43 -06001180 if ((S_ISREG(inode->i_mode)) || (S_ISDIR(inode->i_mode))) {
1181 if (v9fs_proto_dotu(v9ses) && (stat->extension[0] != '\0')) {
1182 /*
1183 * Hadlink support got added later to
1184 * to the .u extension. So there can be
1185 * server out there that doesn't support
1186 * this even with .u extension. So check
1187 * for non NULL stat->extension
1188 */
Chen Gangb3f8ab42013-07-16 15:33:16 +08001189 strlcpy(ext, stat->extension, sizeof(ext));
Aneesh Kumar K.V57171442010-03-05 14:43:43 -06001190 /* HARDLINKCOUNT %u */
1191 sscanf(ext, "%13s %u", tag_name, &i_nlink);
1192 if (!strncmp(tag_name, "HARDLINKCOUNT", 13))
Miklos Szeredibfe86842011-10-28 14:13:29 +02001193 set_nlink(inode, i_nlink);
Aneesh Kumar K.V57171442010-03-05 14:43:43 -06001194 }
1195 }
Aneesh Kumar K.Vdf345c62012-01-05 13:39:49 +05301196 mode = p9mode2perm(v9ses, stat);
Aneesh Kumar K.V45089142011-07-25 18:06:33 +00001197 mode |= inode->i_mode & ~S_IALLUGO;
1198 inode->i_mode = mode;
Abhishek Kulkarni7549ae32009-09-22 11:34:05 -05001199 i_size_write(inode, stat->length);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001200
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001201 /* not real number of blocks, but 512 byte ones ... */
Abhishek Kulkarni7549ae32009-09-22 11:34:05 -05001202 inode->i_blocks = (i_size_read(inode) + 512 - 1) >> 9;
Aneesh Kumar K.Vb3cbea02011-02-28 17:04:06 +05301203 v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001204}
1205
1206/**
1207 * v9fs_qid2ino - convert qid into inode number
1208 * @qid: qid to hash
1209 *
1210 * BUG: potential for inode number collisions?
1211 */
1212
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001213ino_t v9fs_qid2ino(struct p9_qid *qid)
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001214{
1215 u64 path = qid->path + 2;
1216 ino_t i = 0;
1217
1218 if (sizeof(ino_t) == sizeof(path))
1219 memcpy(&i, &path, sizeof(ino_t));
1220 else
1221 i = (ino_t) (path ^ (path >> 32));
1222
1223 return i;
1224}
1225
1226/**
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001227 * v9fs_vfs_follow_link - follow a symlink path
1228 * @dentry: dentry for symlink
Al Viro89076bc2015-05-12 08:29:38 -04001229 * @cookie: place to pass the data to put_link()
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001230 */
1231
Al Viro6e771372015-05-02 13:37:52 -04001232static const char *v9fs_vfs_follow_link(struct dentry *dentry, void **cookie)
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001233{
Al Viro90e4fc82015-04-14 17:42:49 -04001234 struct v9fs_session_info *v9ses = v9fs_dentry2v9ses(dentry);
1235 struct p9_fid *fid = v9fs_fid_lookup(dentry);
1236 struct p9_wstat *st;
Al Viro680baac2015-05-02 13:32:22 -04001237 char *res;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001238
Al Viro4b8e9922014-08-19 20:17:38 -04001239 p9_debug(P9_DEBUG_VFS, "%pd\n", dentry);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001240
Al Viro90e4fc82015-04-14 17:42:49 -04001241 if (IS_ERR(fid))
1242 return ERR_CAST(fid);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001243
Al Viro90e4fc82015-04-14 17:42:49 -04001244 if (!v9fs_proto_dotu(v9ses))
1245 return ERR_PTR(-EBADF);
1246
1247 st = p9_client_stat(fid);
1248 if (IS_ERR(st))
1249 return ERR_CAST(st);
1250
1251 if (!(st->mode & P9_DMSYMLINK)) {
1252 p9stat_free(st);
1253 kfree(st);
1254 return ERR_PTR(-EINVAL);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001255 }
Al Viro680baac2015-05-02 13:32:22 -04001256 res = st->extension;
Al Viro90e4fc82015-04-14 17:42:49 -04001257 st->extension = NULL;
Al Viro680baac2015-05-02 13:32:22 -04001258 if (strlen(res) >= PATH_MAX)
1259 res[PATH_MAX - 1] = '\0';
1260
Al Viro90e4fc82015-04-14 17:42:49 -04001261 p9stat_free(st);
1262 kfree(st);
Al Viro680baac2015-05-02 13:32:22 -04001263 return *cookie = res;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001264}
1265
1266/**
Eric Van Hensbergenee443992008-03-05 07:08:09 -06001267 * v9fs_vfs_mkspecial - create a special file
1268 * @dir: inode to create special file in
1269 * @dentry: dentry to create
Fabian Frederickfd2916b2014-06-04 16:06:26 -07001270 * @perm: mode to create special file
Eric Van Hensbergenee443992008-03-05 07:08:09 -06001271 * @extension: 9p2000.u format extension string representing special file
1272 *
1273 */
1274
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001275static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry,
Al Viroc2837de2011-07-24 18:59:07 -04001276 u32 perm, const char *extension)
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001277{
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001278 struct p9_fid *fid;
Aneesh Kumar K.Vd28c61f2011-02-28 17:04:08 +05301279 struct v9fs_session_info *v9ses;
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001280
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -08001281 v9ses = v9fs_inode2v9ses(dir);
Sripathi Kodidd6102f2010-03-05 18:48:00 +00001282 if (!v9fs_proto_dotu(v9ses)) {
Joe Perches5d385152011-11-28 10:40:46 -08001283 p9_debug(P9_DEBUG_ERROR, "not extended\n");
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -08001284 return -EPERM;
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001285 }
1286
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001287 fid = v9fs_create(v9ses, dir, dentry, (char *) extension, perm,
1288 P9_OREAD);
1289 if (IS_ERR(fid))
1290 return PTR_ERR(fid);
Eric Van Hensbergenda977b22007-01-26 00:57:06 -08001291
Aneesh Kumar K.Vd28c61f2011-02-28 17:04:08 +05301292 v9fs_invalidate_inode_attr(dir);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001293 p9_client_clunk(fid);
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -08001294 return 0;
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001295}
1296
1297/**
1298 * v9fs_vfs_symlink - helper function to create symlinks
1299 * @dir: directory inode containing symlink
1300 * @dentry: dentry for symlink
1301 * @symname: symlink data
1302 *
Eric Van Hensbergenee443992008-03-05 07:08:09 -06001303 * See Also: 9P2000.u RFC for more information
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001304 *
1305 */
1306
1307static int
1308v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
1309{
Al Viro4b8e9922014-08-19 20:17:38 -04001310 p9_debug(P9_DEBUG_VFS, " %lu,%pd,%s\n",
1311 dir->i_ino, dentry, symname);
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001312
Al Viroc2837de2011-07-24 18:59:07 -04001313 return v9fs_vfs_mkspecial(dir, dentry, P9_DMSYMLINK, symname);
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001314}
1315
Al Virob46c2672015-04-14 12:10:34 -04001316#define U32_MAX_DIGITS 10
1317
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001318/**
1319 * v9fs_vfs_link - create a hardlink
1320 * @old_dentry: dentry for file to link to
1321 * @dir: inode destination for new link
Eric Van Hensbergen73c592b2005-09-09 13:04:26 -07001322 * @dentry: dentry for link
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001323 *
1324 */
1325
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001326static int
1327v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir,
1328 struct dentry *dentry)
1329{
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001330 int retval;
Al Virob46c2672015-04-14 12:10:34 -04001331 char name[1 + U32_MAX_DIGITS + 2]; /* sign + number + \n + \0 */
Aneesh Kumar K.Vd28c61f2011-02-28 17:04:08 +05301332 struct p9_fid *oldfid;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001333
Al Viro4b8e9922014-08-19 20:17:38 -04001334 p9_debug(P9_DEBUG_VFS, " %lu,%pd,%pd\n",
1335 dir->i_ino, dentry, old_dentry);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001336
Eric Van Hensbergenda977b22007-01-26 00:57:06 -08001337 oldfid = v9fs_fid_clone(old_dentry);
Latchesar Ionkovba176742007-10-17 14:31:07 -05001338 if (IS_ERR(oldfid))
Eric Van Hensbergenda977b22007-01-26 00:57:06 -08001339 return PTR_ERR(oldfid);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001340
Latchesar Ionkov16cce6d2006-03-25 03:07:26 -08001341 sprintf(name, "%d\n", oldfid->fid);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001342 retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name);
Aneesh Kumar K.Vc06c0662011-02-28 17:04:09 +05301343 if (!retval) {
David Howells2b0143b2015-03-17 22:25:59 +00001344 v9fs_refresh_inode(oldfid, d_inode(old_dentry));
Aneesh Kumar K.Vd28c61f2011-02-28 17:04:08 +05301345 v9fs_invalidate_inode_attr(dir);
Aneesh Kumar K.Vc06c0662011-02-28 17:04:09 +05301346 }
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001347 p9_client_clunk(oldfid);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001348 return retval;
1349}
1350
1351/**
1352 * v9fs_vfs_mknod - create a special file
1353 * @dir: inode destination for new link
1354 * @dentry: dentry for file
1355 * @mode: mode for creation
Eric Van Hensbergenee443992008-03-05 07:08:09 -06001356 * @rdev: device associated with special file
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001357 *
1358 */
1359
1360static int
Al Viro1a67aaf2011-07-26 01:52:52 -04001361v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t rdev)
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001362{
Al Viroc2837de2011-07-24 18:59:07 -04001363 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir);
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001364 int retval;
Al Virob46c2672015-04-14 12:10:34 -04001365 char name[2 + U32_MAX_DIGITS + 1 + U32_MAX_DIGITS + 1];
Al Viroc2837de2011-07-24 18:59:07 -04001366 u32 perm;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001367
Al Viro4b8e9922014-08-19 20:17:38 -04001368 p9_debug(P9_DEBUG_VFS, " %lu,%pd mode: %hx MAJOR: %u MINOR: %u\n",
1369 dir->i_ino, dentry, mode,
Joe Perches5d385152011-11-28 10:40:46 -08001370 MAJOR(rdev), MINOR(rdev));
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001371
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001372 if (!new_valid_dev(rdev))
1373 return -EINVAL;
Eric Van Hensbergen73c592b2005-09-09 13:04:26 -07001374
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001375 /* build extension */
1376 if (S_ISBLK(mode))
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001377 sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev));
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001378 else if (S_ISCHR(mode))
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001379 sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev));
Al Virob46c2672015-04-14 12:10:34 -04001380 else
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001381 *name = 0;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001382
Al Viroc2837de2011-07-24 18:59:07 -04001383 perm = unixmode2p9mode(v9ses, mode);
1384 retval = v9fs_vfs_mkspecial(dir, dentry, perm, name);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001385
1386 return retval;
1387}
1388
Aneesh Kumar K.Vb3cbea02011-02-28 17:04:06 +05301389int v9fs_refresh_inode(struct p9_fid *fid, struct inode *inode)
1390{
Aneesh Kumar K.V45089142011-07-25 18:06:33 +00001391 int umode;
1392 dev_t rdev;
Aneesh Kumar K.Vb3cbea02011-02-28 17:04:06 +05301393 loff_t i_size;
1394 struct p9_wstat *st;
1395 struct v9fs_session_info *v9ses;
1396
1397 v9ses = v9fs_inode2v9ses(inode);
1398 st = p9_client_stat(fid);
1399 if (IS_ERR(st))
1400 return PTR_ERR(st);
Aneesh Kumar K.V45089142011-07-25 18:06:33 +00001401 /*
1402 * Don't update inode if the file type is different
1403 */
1404 umode = p9mode2unixmode(v9ses, st, &rdev);
1405 if ((inode->i_mode & S_IFMT) != (umode & S_IFMT))
1406 goto out;
Aneesh Kumar K.Vb3cbea02011-02-28 17:04:06 +05301407
1408 spin_lock(&inode->i_lock);
1409 /*
1410 * We don't want to refresh inode->i_size,
1411 * because we may have cached data
1412 */
1413 i_size = inode->i_size;
1414 v9fs_stat2inode(st, inode, inode->i_sb);
Dominique Martinetfb89b452014-01-10 13:44:09 +01001415 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
Aneesh Kumar K.Vb3cbea02011-02-28 17:04:06 +05301416 inode->i_size = i_size;
1417 spin_unlock(&inode->i_lock);
Aneesh Kumar K.V45089142011-07-25 18:06:33 +00001418out:
Aneesh Kumar K.Vb3cbea02011-02-28 17:04:06 +05301419 p9stat_free(st);
1420 kfree(st);
1421 return 0;
1422}
1423
Sripathi Kodi9b6533c2010-03-25 12:41:54 +00001424static const struct inode_operations v9fs_dir_inode_operations_dotu = {
1425 .create = v9fs_vfs_create,
1426 .lookup = v9fs_vfs_lookup,
Miklos Szeredie43ae792012-06-05 15:10:26 +02001427 .atomic_open = v9fs_vfs_atomic_open,
Sripathi Kodi9b6533c2010-03-25 12:41:54 +00001428 .symlink = v9fs_vfs_symlink,
Venkateswararao Jujjuri (JV)50cc42f2010-06-09 15:59:31 -07001429 .link = v9fs_vfs_link,
Sripathi Kodi9b6533c2010-03-25 12:41:54 +00001430 .unlink = v9fs_vfs_unlink,
1431 .mkdir = v9fs_vfs_mkdir,
1432 .rmdir = v9fs_vfs_rmdir,
Aneesh Kumar K.V1d76e312010-08-30 17:43:07 +00001433 .mknod = v9fs_vfs_mknod,
Sripathi Kodi9b6533c2010-03-25 12:41:54 +00001434 .rename = v9fs_vfs_rename,
1435 .getattr = v9fs_vfs_getattr,
1436 .setattr = v9fs_vfs_setattr,
1437};
1438
Arjan van de Ven754661f2007-02-12 00:55:38 -08001439static const struct inode_operations v9fs_dir_inode_operations = {
Eric Van Hensbergenb5016112005-09-09 13:04:27 -07001440 .create = v9fs_vfs_create,
1441 .lookup = v9fs_vfs_lookup,
Miklos Szeredie43ae792012-06-05 15:10:26 +02001442 .atomic_open = v9fs_vfs_atomic_open,
Eric Van Hensbergenb5016112005-09-09 13:04:27 -07001443 .unlink = v9fs_vfs_unlink,
1444 .mkdir = v9fs_vfs_mkdir,
1445 .rmdir = v9fs_vfs_rmdir,
1446 .mknod = v9fs_vfs_mknod,
1447 .rename = v9fs_vfs_rename,
1448 .getattr = v9fs_vfs_getattr,
1449 .setattr = v9fs_vfs_setattr,
1450};
1451
Arjan van de Ven754661f2007-02-12 00:55:38 -08001452static const struct inode_operations v9fs_file_inode_operations = {
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001453 .getattr = v9fs_vfs_getattr,
1454 .setattr = v9fs_vfs_setattr,
1455};
1456
Arjan van de Ven754661f2007-02-12 00:55:38 -08001457static const struct inode_operations v9fs_symlink_inode_operations = {
Al Viro204f2f02009-12-23 00:35:54 -05001458 .readlink = generic_readlink,
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001459 .follow_link = v9fs_vfs_follow_link,
Al Viro90e4fc82015-04-14 17:42:49 -04001460 .put_link = kfree_put_link,
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001461 .getattr = v9fs_vfs_getattr,
1462 .setattr = v9fs_vfs_setattr,
1463};
Sripathi Kodi9b6533c2010-03-25 12:41:54 +00001464