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Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -07001/*
2 * linux/fs/9p/vfs_file.c
3 *
4 * This file contians vfs file ops for 9P2000.
5 *
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 Hensbergene69e7fe2005-09-09 13:04:18 -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
26#include <linux/module.h>
27#include <linux/errno.h>
28#include <linux/fs.h>
Al Viro914e2632006-10-18 13:55:46 -040029#include <linux/sched.h>
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -070030#include <linux/file.h>
31#include <linux/stat.h>
32#include <linux/string.h>
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -070033#include <linux/inet.h>
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -070034#include <linux/list.h>
Abhishek Kulkarni637d0202009-09-22 11:34:05 -050035#include <linux/pagemap.h>
M. Mohan Kumara0990272010-09-27 11:34:24 +053036#include <linux/utsname.h>
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -070037#include <asm/uaccess.h>
38#include <linux/idr.h>
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -050039#include <net/9p/9p.h>
40#include <net/9p/client.h>
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -070041
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -070042#include "v9fs.h"
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -070043#include "v9fs_vfs.h"
44#include "fid.h"
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -050045#include "cache.h"
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -070046
Aneesh Kumar K.V7263ceb2011-02-28 17:03:58 +053047static const struct vm_operations_struct v9fs_file_vm_ops;
48
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -070049/**
50 * v9fs_file_open - open a file (or directory)
51 * @inode: inode to be opened
52 * @file: file being opened
53 *
54 */
55
56int v9fs_file_open(struct inode *inode, struct file *file)
57{
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -080058 int err;
Aneesh Kumar K.V6b39f6d2011-02-28 17:04:03 +053059 struct v9fs_inode *v9inode;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -050060 struct v9fs_session_info *v9ses;
61 struct p9_fid *fid;
62 int omode;
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -070063
Joe Perches5d385152011-11-28 10:40:46 -080064 p9_debug(P9_DEBUG_VFS, "inode: %p file: %p\n", inode, file);
Aneesh Kumar K.V6b39f6d2011-02-28 17:04:03 +053065 v9inode = V9FS_I(inode);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -050066 v9ses = v9fs_inode2v9ses(inode);
M. Mohan Kumaref565472010-06-22 19:47:50 +053067 if (v9fs_proto_dotl(v9ses))
Aneesh Kumar K.Vf88657c2011-08-03 19:55:32 +053068 omode = v9fs_open_to_dotl_flags(file->f_flags);
M. Mohan Kumaref565472010-06-22 19:47:50 +053069 else
70 omode = v9fs_uflags2omode(file->f_flags,
71 v9fs_proto_dotu(v9ses));
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -050072 fid = file->private_data;
73 if (!fid) {
74 fid = v9fs_fid_clone(file->f_path.dentry);
75 if (IS_ERR(fid))
76 return PTR_ERR(fid);
77
78 err = p9_client_open(fid, omode);
Eric Van Hensbergen9523a842007-07-13 13:01:27 -050079 if (err < 0) {
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -050080 p9_client_clunk(fid);
81 return err;
82 }
M. Mohan Kumaref565472010-06-22 19:47:50 +053083 if (file->f_flags & O_TRUNC) {
Abhishek Kulkarni7549ae32009-09-22 11:34:05 -050084 i_size_write(inode, 0);
Eric Van Hensbergen9523a842007-07-13 13:01:27 -050085 inode->i_blocks = 0;
86 }
M. Mohan Kumaref565472010-06-22 19:47:50 +053087 if ((file->f_flags & O_APPEND) &&
88 (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses)))
Eric Van Hensbergen2e4bef42008-06-24 17:39:39 -050089 generic_file_llseek(file, 0, SEEK_END);
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -080090 }
91
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -050092 file->private_data = fid;
Aneesh Kumar K.V5a7e0a82011-03-08 16:39:46 +053093 mutex_lock(&v9inode->v_mutex);
Aneesh Kumar K.V7add6972011-03-08 16:39:49 +053094 if (v9ses->cache && !v9inode->writeback_fid &&
95 ((file->f_flags & O_ACCMODE) != O_RDONLY)) {
Aneesh Kumar K.V3cf387d2011-02-28 17:03:57 +053096 /*
Aneesh Kumar K.V6b39f6d2011-02-28 17:04:03 +053097 * clone a fid and add it to writeback_fid
Aneesh Kumar K.V3cf387d2011-02-28 17:03:57 +053098 * we do it during open time instead of
99 * page dirty time via write_begin/page_mkwrite
100 * because we want write after unlink usecase
101 * to work.
102 */
103 fid = v9fs_writeback_fid(file->f_path.dentry);
104 if (IS_ERR(fid)) {
105 err = PTR_ERR(fid);
Aneesh Kumar K.V5a7e0a82011-03-08 16:39:46 +0530106 mutex_unlock(&v9inode->v_mutex);
Aneesh Kumar K.V3cf387d2011-02-28 17:03:57 +0530107 goto out_error;
108 }
Aneesh Kumar K.V6b39f6d2011-02-28 17:04:03 +0530109 v9inode->writeback_fid = (void *) fid;
Aneesh Kumar K.V3cf387d2011-02-28 17:03:57 +0530110 }
Aneesh Kumar K.V5a7e0a82011-03-08 16:39:46 +0530111 mutex_unlock(&v9inode->v_mutex);
Aneesh Kumar K.V29236f42011-02-28 17:03:54 +0530112#ifdef CONFIG_9P_FSCACHE
Aneesh Kumar K.V46848de2011-02-28 17:03:55 +0530113 if (v9ses->cache)
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500114 v9fs_cache_inode_set_cookie(inode, file);
Aneesh Kumar K.V29236f42011-02-28 17:03:54 +0530115#endif
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700116 return 0;
Aneesh Kumar K.V3cf387d2011-02-28 17:03:57 +0530117out_error:
118 p9_client_clunk(file->private_data);
119 file->private_data = NULL;
120 return err;
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700121}
122
123/**
124 * v9fs_file_lock - lock a file (or directory)
Eric Van Hensbergenee443992008-03-05 07:08:09 -0600125 * @filp: file to be locked
126 * @cmd: lock command
127 * @fl: file lock structure
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700128 *
Eric Van Hensbergenee443992008-03-05 07:08:09 -0600129 * Bugs: this looks like a local only lock, we should extend into 9P
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700130 * by using open exclusive
131 */
132
133static int v9fs_file_lock(struct file *filp, int cmd, struct file_lock *fl)
134{
135 int res = 0;
Josef "Jeff" Sipekd6f787b2006-12-08 02:36:45 -0800136 struct inode *inode = filp->f_path.dentry->d_inode;
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700137
Joe Perches5d385152011-11-28 10:40:46 -0800138 p9_debug(P9_DEBUG_VFS, "filp: %p lock: %p\n", filp, fl);
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700139
140 /* No mandatory locks */
Sachin Prabhuf78233d2010-03-13 09:03:55 -0600141 if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK)
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700142 return -ENOLCK;
143
144 if ((IS_SETLK(cmd) || IS_SETLKW(cmd)) && fl->fl_type != F_UNLCK) {
OGAWA Hirofumi28fd1292006-01-08 01:02:14 -0800145 filemap_write_and_wait(inode->i_mapping);
Andrew Mortonfc0ecff2007-02-10 01:45:39 -0800146 invalidate_mapping_pages(&inode->i_data, 0, -1);
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700147 }
148
149 return res;
150}
151
M. Mohan Kumara0990272010-09-27 11:34:24 +0530152static int v9fs_file_do_lock(struct file *filp, int cmd, struct file_lock *fl)
153{
154 struct p9_flock flock;
155 struct p9_fid *fid;
156 uint8_t status;
157 int res = 0;
158 unsigned char fl_type;
159
160 fid = filp->private_data;
161 BUG_ON(fid == NULL);
162
163 if ((fl->fl_flags & FL_POSIX) != FL_POSIX)
164 BUG();
165
166 res = posix_lock_file_wait(filp, fl);
167 if (res < 0)
168 goto out;
169
170 /* convert posix lock to p9 tlock args */
171 memset(&flock, 0, sizeof(flock));
Jim Garlick51b8b4f2011-08-21 00:21:18 +0530172 /* map the lock type */
173 switch (fl->fl_type) {
174 case F_RDLCK:
175 flock.type = P9_LOCK_TYPE_RDLCK;
176 break;
177 case F_WRLCK:
178 flock.type = P9_LOCK_TYPE_WRLCK;
179 break;
180 case F_UNLCK:
181 flock.type = P9_LOCK_TYPE_UNLCK;
182 break;
183 }
M. Mohan Kumara0990272010-09-27 11:34:24 +0530184 flock.start = fl->fl_start;
185 if (fl->fl_end == OFFSET_MAX)
186 flock.length = 0;
187 else
188 flock.length = fl->fl_end - fl->fl_start + 1;
189 flock.proc_id = fl->fl_pid;
190 flock.client_id = utsname()->nodename;
191 if (IS_SETLKW(cmd))
192 flock.flags = P9_LOCK_FLAGS_BLOCK;
193
194 /*
195 * if its a blocked request and we get P9_LOCK_BLOCKED as the status
196 * for lock request, keep on trying
197 */
198 for (;;) {
199 res = p9_client_lock_dotl(fid, &flock, &status);
200 if (res < 0)
201 break;
202
203 if (status != P9_LOCK_BLOCKED)
204 break;
205 if (status == P9_LOCK_BLOCKED && !IS_SETLKW(cmd))
206 break;
Jim Garlicka0ea7872012-01-03 15:27:50 -0600207 if (schedule_timeout_interruptible(P9_LOCK_TIMEOUT) != 0)
208 break;
M. Mohan Kumara0990272010-09-27 11:34:24 +0530209 }
210
211 /* map 9p status to VFS status */
212 switch (status) {
213 case P9_LOCK_SUCCESS:
214 res = 0;
215 break;
216 case P9_LOCK_BLOCKED:
217 res = -EAGAIN;
218 break;
219 case P9_LOCK_ERROR:
220 case P9_LOCK_GRACE:
221 res = -ENOLCK;
222 break;
223 default:
224 BUG();
225 }
226
227 /*
228 * incase server returned error for lock request, revert
229 * it locally
230 */
231 if (res < 0 && fl->fl_type != F_UNLCK) {
232 fl_type = fl->fl_type;
233 fl->fl_type = F_UNLCK;
234 res = posix_lock_file_wait(filp, fl);
235 fl->fl_type = fl_type;
236 }
237out:
238 return res;
239}
240
M. Mohan Kumar1d769cd2010-09-27 12:22:13 +0530241static int v9fs_file_getlock(struct file *filp, struct file_lock *fl)
242{
243 struct p9_getlock glock;
244 struct p9_fid *fid;
245 int res = 0;
246
247 fid = filp->private_data;
248 BUG_ON(fid == NULL);
249
250 posix_test_lock(filp, fl);
251 /*
252 * if we have a conflicting lock locally, no need to validate
253 * with server
254 */
255 if (fl->fl_type != F_UNLCK)
256 return res;
257
258 /* convert posix lock to p9 tgetlock args */
259 memset(&glock, 0, sizeof(glock));
Jim Garlick51b8b4f2011-08-21 00:21:18 +0530260 glock.type = P9_LOCK_TYPE_UNLCK;
M. Mohan Kumar1d769cd2010-09-27 12:22:13 +0530261 glock.start = fl->fl_start;
262 if (fl->fl_end == OFFSET_MAX)
263 glock.length = 0;
264 else
265 glock.length = fl->fl_end - fl->fl_start + 1;
266 glock.proc_id = fl->fl_pid;
267 glock.client_id = utsname()->nodename;
268
269 res = p9_client_getlock_dotl(fid, &glock);
270 if (res < 0)
271 return res;
Jim Garlick51b8b4f2011-08-21 00:21:18 +0530272 /* map 9p lock type to os lock type */
273 switch (glock.type) {
274 case P9_LOCK_TYPE_RDLCK:
275 fl->fl_type = F_RDLCK;
276 break;
277 case P9_LOCK_TYPE_WRLCK:
278 fl->fl_type = F_WRLCK;
279 break;
280 case P9_LOCK_TYPE_UNLCK:
281 fl->fl_type = F_UNLCK;
282 break;
283 }
284 if (glock.type != P9_LOCK_TYPE_UNLCK) {
M. Mohan Kumar1d769cd2010-09-27 12:22:13 +0530285 fl->fl_start = glock.start;
286 if (glock.length == 0)
287 fl->fl_end = OFFSET_MAX;
288 else
289 fl->fl_end = glock.start + glock.length - 1;
290 fl->fl_pid = glock.proc_id;
Jim Garlick51b8b4f2011-08-21 00:21:18 +0530291 }
M. Mohan Kumar1d769cd2010-09-27 12:22:13 +0530292 return res;
293}
294
M. Mohan Kumara0990272010-09-27 11:34:24 +0530295/**
296 * v9fs_file_lock_dotl - lock a file (or directory)
297 * @filp: file to be locked
298 * @cmd: lock command
299 * @fl: file lock structure
300 *
301 */
302
303static int v9fs_file_lock_dotl(struct file *filp, int cmd, struct file_lock *fl)
304{
305 struct inode *inode = filp->f_path.dentry->d_inode;
306 int ret = -ENOLCK;
307
Joe Perches5d385152011-11-28 10:40:46 -0800308 p9_debug(P9_DEBUG_VFS, "filp: %p cmd:%d lock: %p name: %s\n",
309 filp, cmd, fl, filp->f_path.dentry->d_name.name);
M. Mohan Kumara0990272010-09-27 11:34:24 +0530310
311 /* No mandatory locks */
312 if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK)
313 goto out_err;
314
315 if ((IS_SETLK(cmd) || IS_SETLKW(cmd)) && fl->fl_type != F_UNLCK) {
316 filemap_write_and_wait(inode->i_mapping);
317 invalidate_mapping_pages(&inode->i_data, 0, -1);
318 }
319
320 if (IS_SETLK(cmd) || IS_SETLKW(cmd))
321 ret = v9fs_file_do_lock(filp, cmd, fl);
M. Mohan Kumar1d769cd2010-09-27 12:22:13 +0530322 else if (IS_GETLK(cmd))
323 ret = v9fs_file_getlock(filp, fl);
M. Mohan Kumara0990272010-09-27 11:34:24 +0530324 else
325 ret = -EINVAL;
326out_err:
327 return ret;
328}
329
330/**
331 * v9fs_file_flock_dotl - lock a file
332 * @filp: file to be locked
333 * @cmd: lock command
334 * @fl: file lock structure
335 *
336 */
337
338static int v9fs_file_flock_dotl(struct file *filp, int cmd,
339 struct file_lock *fl)
340{
341 struct inode *inode = filp->f_path.dentry->d_inode;
342 int ret = -ENOLCK;
343
Joe Perches5d385152011-11-28 10:40:46 -0800344 p9_debug(P9_DEBUG_VFS, "filp: %p cmd:%d lock: %p name: %s\n",
345 filp, cmd, fl, filp->f_path.dentry->d_name.name);
M. Mohan Kumara0990272010-09-27 11:34:24 +0530346
347 /* No mandatory locks */
348 if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK)
349 goto out_err;
350
351 if (!(fl->fl_flags & FL_FLOCK))
352 goto out_err;
353
354 if ((IS_SETLK(cmd) || IS_SETLKW(cmd)) && fl->fl_type != F_UNLCK) {
355 filemap_write_and_wait(inode->i_mapping);
356 invalidate_mapping_pages(&inode->i_data, 0, -1);
357 }
358 /* Convert flock to posix lock */
359 fl->fl_owner = (fl_owner_t)filp;
360 fl->fl_start = 0;
361 fl->fl_end = OFFSET_MAX;
362 fl->fl_flags |= FL_POSIX;
363 fl->fl_flags ^= FL_FLOCK;
364
365 if (IS_SETLK(cmd) | IS_SETLKW(cmd))
366 ret = v9fs_file_do_lock(filp, cmd, fl);
367 else
368 ret = -EINVAL;
369out_err:
370 return ret;
371}
372
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700373/**
Aneesh Kumar K.V17311772011-02-28 17:03:56 +0530374 * v9fs_fid_readn - read from a fid
375 * @fid: fid to read
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700376 * @data: data buffer to read data into
Eric Van Hensbergenfbedadc2008-10-13 20:36:16 -0500377 * @udata: user data buffer to read data into
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700378 * @count: size of buffer
379 * @offset: offset at which to read data
380 *
381 */
Eric Van Hensbergenfbedadc2008-10-13 20:36:16 -0500382ssize_t
Aneesh Kumar K.V17311772011-02-28 17:03:56 +0530383v9fs_fid_readn(struct p9_fid *fid, char *data, char __user *udata, u32 count,
Eric Van Hensbergenfbedadc2008-10-13 20:36:16 -0500384 u64 offset)
385{
M. Mohan Kumar97e84422010-06-04 11:59:07 +0000386 int n, total, size;
Eric Van Hensbergenfbedadc2008-10-13 20:36:16 -0500387
Joe Perches5d385152011-11-28 10:40:46 -0800388 p9_debug(P9_DEBUG_VFS, "fid %d offset %llu count %d\n",
389 fid->fid, (long long unsigned)offset, count);
Eric Van Hensbergenfbedadc2008-10-13 20:36:16 -0500390 n = 0;
391 total = 0;
M. Mohan Kumar97e84422010-06-04 11:59:07 +0000392 size = fid->iounit ? fid->iounit : fid->clnt->msize - P9_IOHDRSZ;
Eric Van Hensbergenfbedadc2008-10-13 20:36:16 -0500393 do {
394 n = p9_client_read(fid, data, udata, offset, count);
395 if (n <= 0)
396 break;
397
398 if (data)
399 data += n;
400 if (udata)
401 udata += n;
402
403 offset += n;
404 count -= n;
405 total += n;
M. Mohan Kumar97e84422010-06-04 11:59:07 +0000406 } while (count > 0 && n == size);
Eric Van Hensbergenfbedadc2008-10-13 20:36:16 -0500407
408 if (n < 0)
409 total = n;
410
411 return total;
412}
413
414/**
Aneesh Kumar K.V17311772011-02-28 17:03:56 +0530415 * v9fs_file_readn - read from a file
416 * @filp: file pointer to read
417 * @data: data buffer to read data into
418 * @udata: user data buffer to read data into
419 * @count: size of buffer
420 * @offset: offset at which to read data
421 *
422 */
423ssize_t
424v9fs_file_readn(struct file *filp, char *data, char __user *udata, u32 count,
425 u64 offset)
426{
427 return v9fs_fid_readn(filp->private_data, data, udata, count, offset);
428}
429
430/**
Eric Van Hensbergenfbedadc2008-10-13 20:36:16 -0500431 * v9fs_file_read - read from a file
432 * @filp: file pointer to read
433 * @udata: user data buffer to read data into
434 * @count: size of buffer
435 * @offset: offset at which to read data
436 *
437 */
438
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700439static ssize_t
Eric Van Hensbergenfbedadc2008-10-13 20:36:16 -0500440v9fs_file_read(struct file *filp, char __user *udata, size_t count,
Latchesar Ionkov19cba8a2005-10-11 08:29:03 -0700441 loff_t * offset)
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700442{
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500443 int ret;
444 struct p9_fid *fid;
M. Mohan Kumar97e84422010-06-04 11:59:07 +0000445 size_t size;
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700446
Joe Perches5d385152011-11-28 10:40:46 -0800447 p9_debug(P9_DEBUG_VFS, "count %zu offset %lld\n", count, *offset);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500448 fid = filp->private_data;
Eric Van Hensbergenfbedadc2008-10-13 20:36:16 -0500449
M. Mohan Kumar97e84422010-06-04 11:59:07 +0000450 size = fid->iounit ? fid->iounit : fid->clnt->msize - P9_IOHDRSZ;
451 if (count > size)
Eric Van Hensbergenfbedadc2008-10-13 20:36:16 -0500452 ret = v9fs_file_readn(filp, NULL, udata, count, *offset);
453 else
454 ret = p9_client_read(fid, NULL, udata, *offset, count);
455
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500456 if (ret > 0)
457 *offset += ret;
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700458
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500459 return ret;
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700460}
461
Aneesh Kumar K.V17311772011-02-28 17:03:56 +0530462ssize_t
463v9fs_file_write_internal(struct inode *inode, struct p9_fid *fid,
464 const char __user *data, size_t count,
465 loff_t *offset, int invalidate)
466{
467 int n;
Aneesh Kumar K.Vfa6ea162011-02-28 17:04:04 +0530468 loff_t i_size;
Aneesh Kumar K.V17311772011-02-28 17:03:56 +0530469 size_t total = 0;
470 struct p9_client *clnt;
471 loff_t origin = *offset;
472 unsigned long pg_start, pg_end;
473
Joe Perches5d385152011-11-28 10:40:46 -0800474 p9_debug(P9_DEBUG_VFS, "data %p count %d offset %x\n",
475 data, (int)count, (int)*offset);
Aneesh Kumar K.V17311772011-02-28 17:03:56 +0530476
477 clnt = fid->clnt;
478 do {
479 n = p9_client_write(fid, NULL, data+total, origin+total, count);
480 if (n <= 0)
481 break;
482 count -= n;
483 total += n;
484 } while (count > 0);
485
486 if (invalidate && (total > 0)) {
487 pg_start = origin >> PAGE_CACHE_SHIFT;
488 pg_end = (origin + total - 1) >> PAGE_CACHE_SHIFT;
489 if (inode->i_mapping && inode->i_mapping->nrpages)
490 invalidate_inode_pages2_range(inode->i_mapping,
491 pg_start, pg_end);
492 *offset += total;
Aneesh Kumar K.Vfa6ea162011-02-28 17:04:04 +0530493 i_size = i_size_read(inode);
494 if (*offset > i_size) {
495 inode_add_bytes(inode, *offset - i_size);
496 i_size_write(inode, *offset);
497 }
Aneesh Kumar K.V17311772011-02-28 17:03:56 +0530498 }
499 if (n < 0)
500 return n;
501
502 return total;
503}
504
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700505/**
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700506 * v9fs_file_write - write to a file
Eric Van Hensbergenee443992008-03-05 07:08:09 -0600507 * @filp: file pointer to write
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700508 * @data: data buffer to write data from
509 * @count: size of buffer
510 * @offset: offset at which to write data
511 *
512 */
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700513static ssize_t
514v9fs_file_write(struct file *filp, const char __user * data,
Aneesh Kumar K.V17311772011-02-28 17:03:56 +0530515 size_t count, loff_t *offset)
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700516{
Aneesh Kumar K.V17311772011-02-28 17:03:56 +0530517 ssize_t retval = 0;
jvraofc0f2962010-03-08 22:07:02 +0000518 loff_t origin = *offset;
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700519
Eric Van Hensbergendfb0ec22008-10-13 20:36:16 -0500520
Harsh Prateek Bora3834b122010-08-03 11:55:40 +0000521 retval = generic_write_checks(filp, &origin, &count, 0);
522 if (retval)
523 goto out;
524
525 retval = -EINVAL;
526 if ((ssize_t) count < 0)
527 goto out;
528 retval = 0;
529 if (!count)
530 goto out;
531
M. Mohan Kumaraaf0ef12011-03-16 21:40:49 +0530532 retval = v9fs_file_write_internal(filp->f_path.dentry->d_inode,
Aneesh Kumar K.V17311772011-02-28 17:03:56 +0530533 filp->private_data,
M. Mohan Kumaraaf0ef12011-03-16 21:40:49 +0530534 data, count, &origin, 1);
535 /* update offset on successful write */
536 if (retval > 0)
537 *offset = origin;
Harsh Prateek Bora3834b122010-08-03 11:55:40 +0000538out:
539 return retval;
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700540}
541
Aneesh Kumar K.V7263ceb2011-02-28 17:03:58 +0530542
Josef Bacik02c24a82011-07-16 20:44:56 -0400543static int v9fs_file_fsync(struct file *filp, loff_t start, loff_t end,
544 int datasync)
M. Mohan Kumar7a4439c2010-02-08 15:36:48 -0600545{
546 struct p9_fid *fid;
Josef Bacik02c24a82011-07-16 20:44:56 -0400547 struct inode *inode = filp->f_mapping->host;
M. Mohan Kumar7a4439c2010-02-08 15:36:48 -0600548 struct p9_wstat wstat;
549 int retval;
550
Josef Bacik02c24a82011-07-16 20:44:56 -0400551 retval = filemap_write_and_wait_range(inode->i_mapping, start, end);
552 if (retval)
553 return retval;
554
555 mutex_lock(&inode->i_mutex);
Joe Perches5d385152011-11-28 10:40:46 -0800556 p9_debug(P9_DEBUG_VFS, "filp %p datasync %x\n", filp, datasync);
M. Mohan Kumar7a4439c2010-02-08 15:36:48 -0600557
558 fid = filp->private_data;
559 v9fs_blank_wstat(&wstat);
560
561 retval = p9_client_wstat(fid, &wstat);
Josef Bacik02c24a82011-07-16 20:44:56 -0400562 mutex_unlock(&inode->i_mutex);
563
M. Mohan Kumar7a4439c2010-02-08 15:36:48 -0600564 return retval;
565}
566
Josef Bacik02c24a82011-07-16 20:44:56 -0400567int v9fs_file_fsync_dotl(struct file *filp, loff_t start, loff_t end,
568 int datasync)
Venkateswararao Jujjuri (JV)920e65d2010-09-22 17:19:19 -0700569{
570 struct p9_fid *fid;
Josef Bacik02c24a82011-07-16 20:44:56 -0400571 struct inode *inode = filp->f_mapping->host;
Venkateswararao Jujjuri (JV)920e65d2010-09-22 17:19:19 -0700572 int retval;
573
Josef Bacik02c24a82011-07-16 20:44:56 -0400574 retval = filemap_write_and_wait_range(inode->i_mapping, start, end);
575 if (retval)
576 return retval;
577
578 mutex_lock(&inode->i_mutex);
Joe Perches5d385152011-11-28 10:40:46 -0800579 p9_debug(P9_DEBUG_VFS, "filp %p datasync %x\n", filp, datasync);
Venkateswararao Jujjuri (JV)920e65d2010-09-22 17:19:19 -0700580
581 fid = filp->private_data;
582
Venkateswararao Jujjuri (JV)b165d602010-10-22 10:13:12 -0700583 retval = p9_client_fsync(fid, datasync);
Josef Bacik02c24a82011-07-16 20:44:56 -0400584 mutex_unlock(&inode->i_mutex);
585
Venkateswararao Jujjuri (JV)920e65d2010-09-22 17:19:19 -0700586 return retval;
587}
588
Aneesh Kumar K.V7263ceb2011-02-28 17:03:58 +0530589static int
590v9fs_file_mmap(struct file *file, struct vm_area_struct *vma)
591{
592 int retval;
593
594 retval = generic_file_mmap(file, vma);
595 if (!retval)
596 vma->vm_ops = &v9fs_file_vm_ops;
597
598 return retval;
599}
600
601static int
602v9fs_vm_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
603{
Aneesh Kumar K.V6b39f6d2011-02-28 17:04:03 +0530604 struct v9fs_inode *v9inode;
Aneesh Kumar K.V7263ceb2011-02-28 17:03:58 +0530605 struct page *page = vmf->page;
606 struct file *filp = vma->vm_file;
607 struct inode *inode = filp->f_path.dentry->d_inode;
608
609
Joe Perches5d385152011-11-28 10:40:46 -0800610 p9_debug(P9_DEBUG_VFS, "page %p fid %lx\n",
611 page, (unsigned long)filp->private_data);
Aneesh Kumar K.V7263ceb2011-02-28 17:03:58 +0530612
Jan Kara120c2bc2012-06-12 16:20:25 +0200613 /* Update file times before taking page lock */
614 file_update_time(filp);
615
Aneesh Kumar K.V6b39f6d2011-02-28 17:04:03 +0530616 v9inode = V9FS_I(inode);
Aneesh Kumar K.V7263ceb2011-02-28 17:03:58 +0530617 /* make sure the cache has finished storing the page */
618 v9fs_fscache_wait_on_page_write(inode, page);
Aneesh Kumar K.V6b39f6d2011-02-28 17:04:03 +0530619 BUG_ON(!v9inode->writeback_fid);
Aneesh Kumar K.V7263ceb2011-02-28 17:03:58 +0530620 lock_page(page);
621 if (page->mapping != inode->i_mapping)
622 goto out_unlock;
623
624 return VM_FAULT_LOCKED;
625out_unlock:
626 unlock_page(page);
627 return VM_FAULT_NOPAGE;
628}
629
Aneesh Kumar K.Ve959b542011-02-28 17:04:04 +0530630static ssize_t
631v9fs_direct_read(struct file *filp, char __user *udata, size_t count,
632 loff_t *offsetp)
633{
634 loff_t size, offset;
635 struct inode *inode;
636 struct address_space *mapping;
637
638 offset = *offsetp;
639 mapping = filp->f_mapping;
640 inode = mapping->host;
641 if (!count)
642 return 0;
643 size = i_size_read(inode);
644 if (offset < size)
645 filemap_write_and_wait_range(mapping, offset,
646 offset + count - 1);
647
648 return v9fs_file_read(filp, udata, count, offsetp);
649}
650
651/**
652 * v9fs_cached_file_read - read from a file
653 * @filp: file pointer to read
654 * @udata: user data buffer to read data into
655 * @count: size of buffer
656 * @offset: offset at which to read data
657 *
658 */
659static ssize_t
660v9fs_cached_file_read(struct file *filp, char __user *data, size_t count,
661 loff_t *offset)
662{
663 if (filp->f_flags & O_DIRECT)
664 return v9fs_direct_read(filp, data, count, offset);
665 return do_sync_read(filp, data, count, offset);
666}
667
668static ssize_t
669v9fs_direct_write(struct file *filp, const char __user * data,
670 size_t count, loff_t *offsetp)
671{
672 loff_t offset;
673 ssize_t retval;
674 struct inode *inode;
675 struct address_space *mapping;
676
677 offset = *offsetp;
678 mapping = filp->f_mapping;
679 inode = mapping->host;
680 if (!count)
681 return 0;
682
683 mutex_lock(&inode->i_mutex);
684 retval = filemap_write_and_wait_range(mapping, offset,
685 offset + count - 1);
686 if (retval)
687 goto err_out;
688 /*
689 * After a write we want buffered reads to be sure to go to disk to get
690 * the new data. We invalidate clean cached page from the region we're
691 * about to write. We do this *before* the write so that if we fail
692 * here we fall back to buffered write
693 */
694 if (mapping->nrpages) {
695 pgoff_t pg_start = offset >> PAGE_CACHE_SHIFT;
696 pgoff_t pg_end = (offset + count - 1) >> PAGE_CACHE_SHIFT;
697
698 retval = invalidate_inode_pages2_range(mapping,
699 pg_start, pg_end);
700 /*
701 * If a page can not be invalidated, fall back
702 * to buffered write.
703 */
704 if (retval) {
705 if (retval == -EBUSY)
706 goto buff_write;
707 goto err_out;
708 }
709 }
710 retval = v9fs_file_write(filp, data, count, offsetp);
711err_out:
712 mutex_unlock(&inode->i_mutex);
713 return retval;
714
715buff_write:
716 mutex_unlock(&inode->i_mutex);
717 return do_sync_write(filp, data, count, offsetp);
718}
719
720/**
721 * v9fs_cached_file_write - write to a file
722 * @filp: file pointer to write
723 * @data: data buffer to write data from
724 * @count: size of buffer
725 * @offset: offset at which to write data
726 *
727 */
728static ssize_t
729v9fs_cached_file_write(struct file *filp, const char __user * data,
730 size_t count, loff_t *offset)
731{
732
733 if (filp->f_flags & O_DIRECT)
734 return v9fs_direct_write(filp, data, count, offset);
735 return do_sync_write(filp, data, count, offset);
736}
737
Aneesh Kumar K.V7263ceb2011-02-28 17:03:58 +0530738static const struct vm_operations_struct v9fs_file_vm_ops = {
739 .fault = filemap_fault,
740 .page_mkwrite = v9fs_vm_page_mkwrite,
741};
742
Aneesh Kumar K.Ve959b542011-02-28 17:04:04 +0530743
Aneesh Kumar K.V29236f42011-02-28 17:03:54 +0530744const struct file_operations v9fs_cached_file_operations = {
Eric Van Hensbergene03abc02007-02-11 13:21:39 -0600745 .llseek = generic_file_llseek,
Aneesh Kumar K.Ve959b542011-02-28 17:04:04 +0530746 .read = v9fs_cached_file_read,
747 .write = v9fs_cached_file_write,
Eric Van Hensbergene03abc02007-02-11 13:21:39 -0600748 .aio_read = generic_file_aio_read,
Aneesh Kumar K.V7263ceb2011-02-28 17:03:58 +0530749 .aio_write = generic_file_aio_write,
Eric Van Hensbergene03abc02007-02-11 13:21:39 -0600750 .open = v9fs_file_open,
751 .release = v9fs_dir_release,
752 .lock = v9fs_file_lock,
Aneesh Kumar K.V7263ceb2011-02-28 17:03:58 +0530753 .mmap = v9fs_file_mmap,
M. Mohan Kumar7a4439c2010-02-08 15:36:48 -0600754 .fsync = v9fs_file_fsync,
Eric Van Hensbergene03abc02007-02-11 13:21:39 -0600755};
756
Aneesh Kumar K.V29236f42011-02-28 17:03:54 +0530757const struct file_operations v9fs_cached_file_operations_dotl = {
Venkateswararao Jujjuri (JV)b04faaf2010-09-22 16:30:52 -0700758 .llseek = generic_file_llseek,
Aneesh Kumar K.Ve959b542011-02-28 17:04:04 +0530759 .read = v9fs_cached_file_read,
760 .write = v9fs_cached_file_write,
Venkateswararao Jujjuri (JV)b04faaf2010-09-22 16:30:52 -0700761 .aio_read = generic_file_aio_read,
Aneesh Kumar K.V7263ceb2011-02-28 17:03:58 +0530762 .aio_write = generic_file_aio_write,
Venkateswararao Jujjuri (JV)b04faaf2010-09-22 16:30:52 -0700763 .open = v9fs_file_open,
764 .release = v9fs_dir_release,
M. Mohan Kumara0990272010-09-27 11:34:24 +0530765 .lock = v9fs_file_lock_dotl,
766 .flock = v9fs_file_flock_dotl,
Aneesh Kumar K.V7263ceb2011-02-28 17:03:58 +0530767 .mmap = v9fs_file_mmap,
Venkateswararao Jujjuri (JV)920e65d2010-09-22 17:19:19 -0700768 .fsync = v9fs_file_fsync_dotl,
Venkateswararao Jujjuri (JV)b04faaf2010-09-22 16:30:52 -0700769};
770
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -0800771const struct file_operations v9fs_file_operations = {
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700772 .llseek = generic_file_llseek,
773 .read = v9fs_file_read,
774 .write = v9fs_file_write,
775 .open = v9fs_file_open,
776 .release = v9fs_dir_release,
777 .lock = v9fs_file_lock,
Eric Van Hensbergen14b88692008-02-06 19:25:05 -0600778 .mmap = generic_file_readonly_mmap,
M. Mohan Kumar7a4439c2010-02-08 15:36:48 -0600779 .fsync = v9fs_file_fsync,
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700780};
Sripathi Kodi9b6533c2010-03-25 12:41:54 +0000781
782const struct file_operations v9fs_file_operations_dotl = {
783 .llseek = generic_file_llseek,
784 .read = v9fs_file_read,
785 .write = v9fs_file_write,
786 .open = v9fs_file_open,
787 .release = v9fs_dir_release,
M. Mohan Kumara0990272010-09-27 11:34:24 +0530788 .lock = v9fs_file_lock_dotl,
789 .flock = v9fs_file_flock_dotl,
Sripathi Kodi9b6533c2010-03-25 12:41:54 +0000790 .mmap = generic_file_readonly_mmap,
Venkateswararao Jujjuri (JV)920e65d2010-09-22 17:19:19 -0700791 .fsync = v9fs_file_fsync_dotl,
Sripathi Kodi9b6533c2010-03-25 12:41:54 +0000792};