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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_APPEND) &&
84 (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses)))
Eric Van Hensbergen2e4bef42008-06-24 17:39:39 -050085 generic_file_llseek(file, 0, SEEK_END);
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -080086 }
87
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -050088 file->private_data = fid;
Aneesh Kumar K.V5a7e0a82011-03-08 16:39:46 +053089 mutex_lock(&v9inode->v_mutex);
Aneesh Kumar K.V7add6972011-03-08 16:39:49 +053090 if (v9ses->cache && !v9inode->writeback_fid &&
91 ((file->f_flags & O_ACCMODE) != O_RDONLY)) {
Aneesh Kumar K.V3cf387d2011-02-28 17:03:57 +053092 /*
Aneesh Kumar K.V6b39f6d2011-02-28 17:04:03 +053093 * clone a fid and add it to writeback_fid
Aneesh Kumar K.V3cf387d2011-02-28 17:03:57 +053094 * we do it during open time instead of
95 * page dirty time via write_begin/page_mkwrite
96 * because we want write after unlink usecase
97 * to work.
98 */
99 fid = v9fs_writeback_fid(file->f_path.dentry);
100 if (IS_ERR(fid)) {
101 err = PTR_ERR(fid);
Aneesh Kumar K.V5a7e0a82011-03-08 16:39:46 +0530102 mutex_unlock(&v9inode->v_mutex);
Aneesh Kumar K.V3cf387d2011-02-28 17:03:57 +0530103 goto out_error;
104 }
Aneesh Kumar K.V6b39f6d2011-02-28 17:04:03 +0530105 v9inode->writeback_fid = (void *) fid;
Aneesh Kumar K.V3cf387d2011-02-28 17:03:57 +0530106 }
Aneesh Kumar K.V5a7e0a82011-03-08 16:39:46 +0530107 mutex_unlock(&v9inode->v_mutex);
Aneesh Kumar K.V29236f42011-02-28 17:03:54 +0530108#ifdef CONFIG_9P_FSCACHE
Aneesh Kumar K.V46848de2011-02-28 17:03:55 +0530109 if (v9ses->cache)
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500110 v9fs_cache_inode_set_cookie(inode, file);
Aneesh Kumar K.V29236f42011-02-28 17:03:54 +0530111#endif
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700112 return 0;
Aneesh Kumar K.V3cf387d2011-02-28 17:03:57 +0530113out_error:
114 p9_client_clunk(file->private_data);
115 file->private_data = NULL;
116 return err;
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700117}
118
119/**
120 * v9fs_file_lock - lock a file (or directory)
Eric Van Hensbergenee443992008-03-05 07:08:09 -0600121 * @filp: file to be locked
122 * @cmd: lock command
123 * @fl: file lock structure
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700124 *
Eric Van Hensbergenee443992008-03-05 07:08:09 -0600125 * Bugs: this looks like a local only lock, we should extend into 9P
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700126 * by using open exclusive
127 */
128
129static int v9fs_file_lock(struct file *filp, int cmd, struct file_lock *fl)
130{
131 int res = 0;
Al Viro496ad9a2013-01-23 17:07:38 -0500132 struct inode *inode = file_inode(filp);
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700133
Joe Perches5d385152011-11-28 10:40:46 -0800134 p9_debug(P9_DEBUG_VFS, "filp: %p lock: %p\n", filp, fl);
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700135
136 /* No mandatory locks */
Sachin Prabhuf78233d2010-03-13 09:03:55 -0600137 if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK)
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700138 return -ENOLCK;
139
140 if ((IS_SETLK(cmd) || IS_SETLKW(cmd)) && fl->fl_type != F_UNLCK) {
OGAWA Hirofumi28fd1292006-01-08 01:02:14 -0800141 filemap_write_and_wait(inode->i_mapping);
Andrew Mortonfc0ecff2007-02-10 01:45:39 -0800142 invalidate_mapping_pages(&inode->i_data, 0, -1);
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700143 }
144
145 return res;
146}
147
M. Mohan Kumara0990272010-09-27 11:34:24 +0530148static int v9fs_file_do_lock(struct file *filp, int cmd, struct file_lock *fl)
149{
150 struct p9_flock flock;
151 struct p9_fid *fid;
152 uint8_t status;
153 int res = 0;
154 unsigned char fl_type;
155
156 fid = filp->private_data;
157 BUG_ON(fid == NULL);
158
159 if ((fl->fl_flags & FL_POSIX) != FL_POSIX)
160 BUG();
161
162 res = posix_lock_file_wait(filp, fl);
163 if (res < 0)
164 goto out;
165
166 /* convert posix lock to p9 tlock args */
167 memset(&flock, 0, sizeof(flock));
Jim Garlick51b8b4f2011-08-21 00:21:18 +0530168 /* map the lock type */
169 switch (fl->fl_type) {
170 case F_RDLCK:
171 flock.type = P9_LOCK_TYPE_RDLCK;
172 break;
173 case F_WRLCK:
174 flock.type = P9_LOCK_TYPE_WRLCK;
175 break;
176 case F_UNLCK:
177 flock.type = P9_LOCK_TYPE_UNLCK;
178 break;
179 }
M. Mohan Kumara0990272010-09-27 11:34:24 +0530180 flock.start = fl->fl_start;
181 if (fl->fl_end == OFFSET_MAX)
182 flock.length = 0;
183 else
184 flock.length = fl->fl_end - fl->fl_start + 1;
185 flock.proc_id = fl->fl_pid;
186 flock.client_id = utsname()->nodename;
187 if (IS_SETLKW(cmd))
188 flock.flags = P9_LOCK_FLAGS_BLOCK;
189
190 /*
191 * if its a blocked request and we get P9_LOCK_BLOCKED as the status
192 * for lock request, keep on trying
193 */
194 for (;;) {
195 res = p9_client_lock_dotl(fid, &flock, &status);
196 if (res < 0)
197 break;
198
199 if (status != P9_LOCK_BLOCKED)
200 break;
201 if (status == P9_LOCK_BLOCKED && !IS_SETLKW(cmd))
202 break;
Jim Garlicka0ea7872012-01-03 15:27:50 -0600203 if (schedule_timeout_interruptible(P9_LOCK_TIMEOUT) != 0)
204 break;
M. Mohan Kumara0990272010-09-27 11:34:24 +0530205 }
206
207 /* map 9p status to VFS status */
208 switch (status) {
209 case P9_LOCK_SUCCESS:
210 res = 0;
211 break;
212 case P9_LOCK_BLOCKED:
213 res = -EAGAIN;
214 break;
215 case P9_LOCK_ERROR:
216 case P9_LOCK_GRACE:
217 res = -ENOLCK;
218 break;
219 default:
220 BUG();
221 }
222
223 /*
224 * incase server returned error for lock request, revert
225 * it locally
226 */
227 if (res < 0 && fl->fl_type != F_UNLCK) {
228 fl_type = fl->fl_type;
229 fl->fl_type = F_UNLCK;
230 res = posix_lock_file_wait(filp, fl);
231 fl->fl_type = fl_type;
232 }
233out:
234 return res;
235}
236
M. Mohan Kumar1d769cd2010-09-27 12:22:13 +0530237static int v9fs_file_getlock(struct file *filp, struct file_lock *fl)
238{
239 struct p9_getlock glock;
240 struct p9_fid *fid;
241 int res = 0;
242
243 fid = filp->private_data;
244 BUG_ON(fid == NULL);
245
246 posix_test_lock(filp, fl);
247 /*
248 * if we have a conflicting lock locally, no need to validate
249 * with server
250 */
251 if (fl->fl_type != F_UNLCK)
252 return res;
253
254 /* convert posix lock to p9 tgetlock args */
255 memset(&glock, 0, sizeof(glock));
Jim Garlick51b8b4f2011-08-21 00:21:18 +0530256 glock.type = P9_LOCK_TYPE_UNLCK;
M. Mohan Kumar1d769cd2010-09-27 12:22:13 +0530257 glock.start = fl->fl_start;
258 if (fl->fl_end == OFFSET_MAX)
259 glock.length = 0;
260 else
261 glock.length = fl->fl_end - fl->fl_start + 1;
262 glock.proc_id = fl->fl_pid;
263 glock.client_id = utsname()->nodename;
264
265 res = p9_client_getlock_dotl(fid, &glock);
266 if (res < 0)
267 return res;
Jim Garlick51b8b4f2011-08-21 00:21:18 +0530268 /* map 9p lock type to os lock type */
269 switch (glock.type) {
270 case P9_LOCK_TYPE_RDLCK:
271 fl->fl_type = F_RDLCK;
272 break;
273 case P9_LOCK_TYPE_WRLCK:
274 fl->fl_type = F_WRLCK;
275 break;
276 case P9_LOCK_TYPE_UNLCK:
277 fl->fl_type = F_UNLCK;
278 break;
279 }
280 if (glock.type != P9_LOCK_TYPE_UNLCK) {
M. Mohan Kumar1d769cd2010-09-27 12:22:13 +0530281 fl->fl_start = glock.start;
282 if (glock.length == 0)
283 fl->fl_end = OFFSET_MAX;
284 else
285 fl->fl_end = glock.start + glock.length - 1;
286 fl->fl_pid = glock.proc_id;
Jim Garlick51b8b4f2011-08-21 00:21:18 +0530287 }
M. Mohan Kumar1d769cd2010-09-27 12:22:13 +0530288 return res;
289}
290
M. Mohan Kumara0990272010-09-27 11:34:24 +0530291/**
292 * v9fs_file_lock_dotl - lock a file (or directory)
293 * @filp: file to be locked
294 * @cmd: lock command
295 * @fl: file lock structure
296 *
297 */
298
299static int v9fs_file_lock_dotl(struct file *filp, int cmd, struct file_lock *fl)
300{
Al Viro496ad9a2013-01-23 17:07:38 -0500301 struct inode *inode = file_inode(filp);
M. Mohan Kumara0990272010-09-27 11:34:24 +0530302 int ret = -ENOLCK;
303
Joe Perches5d385152011-11-28 10:40:46 -0800304 p9_debug(P9_DEBUG_VFS, "filp: %p cmd:%d lock: %p name: %s\n",
305 filp, cmd, fl, filp->f_path.dentry->d_name.name);
M. Mohan Kumara0990272010-09-27 11:34:24 +0530306
307 /* No mandatory locks */
308 if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK)
309 goto out_err;
310
311 if ((IS_SETLK(cmd) || IS_SETLKW(cmd)) && fl->fl_type != F_UNLCK) {
312 filemap_write_and_wait(inode->i_mapping);
313 invalidate_mapping_pages(&inode->i_data, 0, -1);
314 }
315
316 if (IS_SETLK(cmd) || IS_SETLKW(cmd))
317 ret = v9fs_file_do_lock(filp, cmd, fl);
M. Mohan Kumar1d769cd2010-09-27 12:22:13 +0530318 else if (IS_GETLK(cmd))
319 ret = v9fs_file_getlock(filp, fl);
M. Mohan Kumara0990272010-09-27 11:34:24 +0530320 else
321 ret = -EINVAL;
322out_err:
323 return ret;
324}
325
326/**
327 * v9fs_file_flock_dotl - lock a file
328 * @filp: file to be locked
329 * @cmd: lock command
330 * @fl: file lock structure
331 *
332 */
333
334static int v9fs_file_flock_dotl(struct file *filp, int cmd,
335 struct file_lock *fl)
336{
Al Viro496ad9a2013-01-23 17:07:38 -0500337 struct inode *inode = file_inode(filp);
M. Mohan Kumara0990272010-09-27 11:34:24 +0530338 int ret = -ENOLCK;
339
Joe Perches5d385152011-11-28 10:40:46 -0800340 p9_debug(P9_DEBUG_VFS, "filp: %p cmd:%d lock: %p name: %s\n",
341 filp, cmd, fl, filp->f_path.dentry->d_name.name);
M. Mohan Kumara0990272010-09-27 11:34:24 +0530342
343 /* No mandatory locks */
344 if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK)
345 goto out_err;
346
347 if (!(fl->fl_flags & FL_FLOCK))
348 goto out_err;
349
350 if ((IS_SETLK(cmd) || IS_SETLKW(cmd)) && fl->fl_type != F_UNLCK) {
351 filemap_write_and_wait(inode->i_mapping);
352 invalidate_mapping_pages(&inode->i_data, 0, -1);
353 }
354 /* Convert flock to posix lock */
355 fl->fl_owner = (fl_owner_t)filp;
356 fl->fl_start = 0;
357 fl->fl_end = OFFSET_MAX;
358 fl->fl_flags |= FL_POSIX;
359 fl->fl_flags ^= FL_FLOCK;
360
361 if (IS_SETLK(cmd) | IS_SETLKW(cmd))
362 ret = v9fs_file_do_lock(filp, cmd, fl);
363 else
364 ret = -EINVAL;
365out_err:
366 return ret;
367}
368
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700369/**
Aneesh Kumar K.V17311772011-02-28 17:03:56 +0530370 * v9fs_fid_readn - read from a fid
371 * @fid: fid to read
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700372 * @data: data buffer to read data into
Eric Van Hensbergenfbedadc2008-10-13 20:36:16 -0500373 * @udata: user data buffer to read data into
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700374 * @count: size of buffer
375 * @offset: offset at which to read data
376 *
377 */
Eric Van Hensbergenfbedadc2008-10-13 20:36:16 -0500378ssize_t
Aneesh Kumar K.V17311772011-02-28 17:03:56 +0530379v9fs_fid_readn(struct p9_fid *fid, char *data, char __user *udata, u32 count,
Eric Van Hensbergenfbedadc2008-10-13 20:36:16 -0500380 u64 offset)
381{
M. Mohan Kumar97e84422010-06-04 11:59:07 +0000382 int n, total, size;
Eric Van Hensbergenfbedadc2008-10-13 20:36:16 -0500383
Joe Perches5d385152011-11-28 10:40:46 -0800384 p9_debug(P9_DEBUG_VFS, "fid %d offset %llu count %d\n",
385 fid->fid, (long long unsigned)offset, count);
Eric Van Hensbergenfbedadc2008-10-13 20:36:16 -0500386 n = 0;
387 total = 0;
M. Mohan Kumar97e84422010-06-04 11:59:07 +0000388 size = fid->iounit ? fid->iounit : fid->clnt->msize - P9_IOHDRSZ;
Eric Van Hensbergenfbedadc2008-10-13 20:36:16 -0500389 do {
390 n = p9_client_read(fid, data, udata, offset, count);
391 if (n <= 0)
392 break;
393
394 if (data)
395 data += n;
396 if (udata)
397 udata += n;
398
399 offset += n;
400 count -= n;
401 total += n;
M. Mohan Kumar97e84422010-06-04 11:59:07 +0000402 } while (count > 0 && n == size);
Eric Van Hensbergenfbedadc2008-10-13 20:36:16 -0500403
404 if (n < 0)
405 total = n;
406
407 return total;
408}
409
410/**
Aneesh Kumar K.V17311772011-02-28 17:03:56 +0530411 * v9fs_file_readn - read from a file
412 * @filp: file pointer to read
413 * @data: data buffer to read data into
414 * @udata: user data buffer to read data into
415 * @count: size of buffer
416 * @offset: offset at which to read data
417 *
418 */
419ssize_t
420v9fs_file_readn(struct file *filp, char *data, char __user *udata, u32 count,
421 u64 offset)
422{
423 return v9fs_fid_readn(filp->private_data, data, udata, count, offset);
424}
425
426/**
Eric Van Hensbergenfbedadc2008-10-13 20:36:16 -0500427 * v9fs_file_read - read from a file
428 * @filp: file pointer to read
429 * @udata: user data buffer to read data into
430 * @count: size of buffer
431 * @offset: offset at which to read data
432 *
433 */
434
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700435static ssize_t
Eric Van Hensbergenfbedadc2008-10-13 20:36:16 -0500436v9fs_file_read(struct file *filp, char __user *udata, size_t count,
Latchesar Ionkov19cba8a2005-10-11 08:29:03 -0700437 loff_t * offset)
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700438{
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500439 int ret;
440 struct p9_fid *fid;
M. Mohan Kumar97e84422010-06-04 11:59:07 +0000441 size_t size;
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700442
Joe Perches5d385152011-11-28 10:40:46 -0800443 p9_debug(P9_DEBUG_VFS, "count %zu offset %lld\n", count, *offset);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500444 fid = filp->private_data;
Eric Van Hensbergenfbedadc2008-10-13 20:36:16 -0500445
M. Mohan Kumar97e84422010-06-04 11:59:07 +0000446 size = fid->iounit ? fid->iounit : fid->clnt->msize - P9_IOHDRSZ;
447 if (count > size)
Eric Van Hensbergenfbedadc2008-10-13 20:36:16 -0500448 ret = v9fs_file_readn(filp, NULL, udata, count, *offset);
449 else
450 ret = p9_client_read(fid, NULL, udata, *offset, count);
451
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500452 if (ret > 0)
453 *offset += ret;
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700454
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500455 return ret;
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700456}
457
Aneesh Kumar K.V17311772011-02-28 17:03:56 +0530458ssize_t
459v9fs_file_write_internal(struct inode *inode, struct p9_fid *fid,
460 const char __user *data, size_t count,
461 loff_t *offset, int invalidate)
462{
463 int n;
Aneesh Kumar K.Vfa6ea162011-02-28 17:04:04 +0530464 loff_t i_size;
Aneesh Kumar K.V17311772011-02-28 17:03:56 +0530465 size_t total = 0;
466 struct p9_client *clnt;
467 loff_t origin = *offset;
468 unsigned long pg_start, pg_end;
469
Joe Perches5d385152011-11-28 10:40:46 -0800470 p9_debug(P9_DEBUG_VFS, "data %p count %d offset %x\n",
471 data, (int)count, (int)*offset);
Aneesh Kumar K.V17311772011-02-28 17:03:56 +0530472
473 clnt = fid->clnt;
474 do {
475 n = p9_client_write(fid, NULL, data+total, origin+total, count);
476 if (n <= 0)
477 break;
478 count -= n;
479 total += n;
480 } while (count > 0);
481
482 if (invalidate && (total > 0)) {
483 pg_start = origin >> PAGE_CACHE_SHIFT;
484 pg_end = (origin + total - 1) >> PAGE_CACHE_SHIFT;
485 if (inode->i_mapping && inode->i_mapping->nrpages)
486 invalidate_inode_pages2_range(inode->i_mapping,
487 pg_start, pg_end);
488 *offset += total;
Aneesh Kumar K.Vfa6ea162011-02-28 17:04:04 +0530489 i_size = i_size_read(inode);
490 if (*offset > i_size) {
491 inode_add_bytes(inode, *offset - i_size);
492 i_size_write(inode, *offset);
493 }
Aneesh Kumar K.V17311772011-02-28 17:03:56 +0530494 }
495 if (n < 0)
496 return n;
497
498 return total;
499}
500
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700501/**
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700502 * v9fs_file_write - write to a file
Eric Van Hensbergenee443992008-03-05 07:08:09 -0600503 * @filp: file pointer to write
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700504 * @data: data buffer to write data from
505 * @count: size of buffer
506 * @offset: offset at which to write data
507 *
508 */
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700509static ssize_t
510v9fs_file_write(struct file *filp, const char __user * data,
Aneesh Kumar K.V17311772011-02-28 17:03:56 +0530511 size_t count, loff_t *offset)
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700512{
Aneesh Kumar K.V17311772011-02-28 17:03:56 +0530513 ssize_t retval = 0;
jvraofc0f2962010-03-08 22:07:02 +0000514 loff_t origin = *offset;
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700515
Eric Van Hensbergendfb0ec22008-10-13 20:36:16 -0500516
Harsh Prateek Bora3834b122010-08-03 11:55:40 +0000517 retval = generic_write_checks(filp, &origin, &count, 0);
518 if (retval)
519 goto out;
520
521 retval = -EINVAL;
522 if ((ssize_t) count < 0)
523 goto out;
524 retval = 0;
525 if (!count)
526 goto out;
527
Al Viro496ad9a2013-01-23 17:07:38 -0500528 retval = v9fs_file_write_internal(file_inode(filp),
Aneesh Kumar K.V17311772011-02-28 17:03:56 +0530529 filp->private_data,
M. Mohan Kumaraaf0ef12011-03-16 21:40:49 +0530530 data, count, &origin, 1);
531 /* update offset on successful write */
532 if (retval > 0)
533 *offset = origin;
Harsh Prateek Bora3834b122010-08-03 11:55:40 +0000534out:
535 return retval;
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700536}
537
Aneesh Kumar K.V7263ceb2011-02-28 17:03:58 +0530538
Josef Bacik02c24a82011-07-16 20:44:56 -0400539static int v9fs_file_fsync(struct file *filp, loff_t start, loff_t end,
540 int datasync)
M. Mohan Kumar7a4439c2010-02-08 15:36:48 -0600541{
542 struct p9_fid *fid;
Josef Bacik02c24a82011-07-16 20:44:56 -0400543 struct inode *inode = filp->f_mapping->host;
M. Mohan Kumar7a4439c2010-02-08 15:36:48 -0600544 struct p9_wstat wstat;
545 int retval;
546
Josef Bacik02c24a82011-07-16 20:44:56 -0400547 retval = filemap_write_and_wait_range(inode->i_mapping, start, end);
548 if (retval)
549 return retval;
550
551 mutex_lock(&inode->i_mutex);
Joe Perches5d385152011-11-28 10:40:46 -0800552 p9_debug(P9_DEBUG_VFS, "filp %p datasync %x\n", filp, datasync);
M. Mohan Kumar7a4439c2010-02-08 15:36:48 -0600553
554 fid = filp->private_data;
555 v9fs_blank_wstat(&wstat);
556
557 retval = p9_client_wstat(fid, &wstat);
Josef Bacik02c24a82011-07-16 20:44:56 -0400558 mutex_unlock(&inode->i_mutex);
559
M. Mohan Kumar7a4439c2010-02-08 15:36:48 -0600560 return retval;
561}
562
Josef Bacik02c24a82011-07-16 20:44:56 -0400563int v9fs_file_fsync_dotl(struct file *filp, loff_t start, loff_t end,
564 int datasync)
Venkateswararao Jujjuri (JV)920e65d2010-09-22 17:19:19 -0700565{
566 struct p9_fid *fid;
Josef Bacik02c24a82011-07-16 20:44:56 -0400567 struct inode *inode = filp->f_mapping->host;
Venkateswararao Jujjuri (JV)920e65d2010-09-22 17:19:19 -0700568 int retval;
569
Josef Bacik02c24a82011-07-16 20:44:56 -0400570 retval = filemap_write_and_wait_range(inode->i_mapping, start, end);
571 if (retval)
572 return retval;
573
574 mutex_lock(&inode->i_mutex);
Joe Perches5d385152011-11-28 10:40:46 -0800575 p9_debug(P9_DEBUG_VFS, "filp %p datasync %x\n", filp, datasync);
Venkateswararao Jujjuri (JV)920e65d2010-09-22 17:19:19 -0700576
577 fid = filp->private_data;
578
Venkateswararao Jujjuri (JV)b165d602010-10-22 10:13:12 -0700579 retval = p9_client_fsync(fid, datasync);
Josef Bacik02c24a82011-07-16 20:44:56 -0400580 mutex_unlock(&inode->i_mutex);
581
Venkateswararao Jujjuri (JV)920e65d2010-09-22 17:19:19 -0700582 return retval;
583}
584
Aneesh Kumar K.V7263ceb2011-02-28 17:03:58 +0530585static int
586v9fs_file_mmap(struct file *file, struct vm_area_struct *vma)
587{
588 int retval;
589
590 retval = generic_file_mmap(file, vma);
591 if (!retval)
592 vma->vm_ops = &v9fs_file_vm_ops;
593
594 return retval;
595}
596
597static int
598v9fs_vm_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
599{
Aneesh Kumar K.V6b39f6d2011-02-28 17:04:03 +0530600 struct v9fs_inode *v9inode;
Aneesh Kumar K.V7263ceb2011-02-28 17:03:58 +0530601 struct page *page = vmf->page;
602 struct file *filp = vma->vm_file;
Al Viro496ad9a2013-01-23 17:07:38 -0500603 struct inode *inode = file_inode(filp);
Aneesh Kumar K.V7263ceb2011-02-28 17:03:58 +0530604
605
Joe Perches5d385152011-11-28 10:40:46 -0800606 p9_debug(P9_DEBUG_VFS, "page %p fid %lx\n",
607 page, (unsigned long)filp->private_data);
Aneesh Kumar K.V7263ceb2011-02-28 17:03:58 +0530608
Jan Kara120c2bc2012-06-12 16:20:25 +0200609 /* Update file times before taking page lock */
610 file_update_time(filp);
611
Aneesh Kumar K.V6b39f6d2011-02-28 17:04:03 +0530612 v9inode = V9FS_I(inode);
Aneesh Kumar K.V7263ceb2011-02-28 17:03:58 +0530613 /* make sure the cache has finished storing the page */
614 v9fs_fscache_wait_on_page_write(inode, page);
Aneesh Kumar K.V6b39f6d2011-02-28 17:04:03 +0530615 BUG_ON(!v9inode->writeback_fid);
Aneesh Kumar K.V7263ceb2011-02-28 17:03:58 +0530616 lock_page(page);
617 if (page->mapping != inode->i_mapping)
618 goto out_unlock;
Darrick J. Wong13575ca2013-02-21 16:42:53 -0800619 wait_for_stable_page(page);
Aneesh Kumar K.V7263ceb2011-02-28 17:03:58 +0530620
621 return VM_FAULT_LOCKED;
622out_unlock:
623 unlock_page(page);
624 return VM_FAULT_NOPAGE;
625}
626
Aneesh Kumar K.Ve959b542011-02-28 17:04:04 +0530627static ssize_t
628v9fs_direct_read(struct file *filp, char __user *udata, size_t count,
629 loff_t *offsetp)
630{
631 loff_t size, offset;
632 struct inode *inode;
633 struct address_space *mapping;
634
635 offset = *offsetp;
636 mapping = filp->f_mapping;
637 inode = mapping->host;
638 if (!count)
639 return 0;
640 size = i_size_read(inode);
641 if (offset < size)
642 filemap_write_and_wait_range(mapping, offset,
643 offset + count - 1);
644
645 return v9fs_file_read(filp, udata, count, offsetp);
646}
647
648/**
649 * v9fs_cached_file_read - read from a file
650 * @filp: file pointer to read
651 * @udata: user data buffer to read data into
652 * @count: size of buffer
653 * @offset: offset at which to read data
654 *
655 */
656static ssize_t
657v9fs_cached_file_read(struct file *filp, char __user *data, size_t count,
658 loff_t *offset)
659{
660 if (filp->f_flags & O_DIRECT)
661 return v9fs_direct_read(filp, data, count, offset);
662 return do_sync_read(filp, data, count, offset);
663}
664
665static ssize_t
666v9fs_direct_write(struct file *filp, const char __user * data,
667 size_t count, loff_t *offsetp)
668{
669 loff_t offset;
670 ssize_t retval;
671 struct inode *inode;
672 struct address_space *mapping;
673
674 offset = *offsetp;
675 mapping = filp->f_mapping;
676 inode = mapping->host;
677 if (!count)
678 return 0;
679
680 mutex_lock(&inode->i_mutex);
681 retval = filemap_write_and_wait_range(mapping, offset,
682 offset + count - 1);
683 if (retval)
684 goto err_out;
685 /*
686 * After a write we want buffered reads to be sure to go to disk to get
687 * the new data. We invalidate clean cached page from the region we're
688 * about to write. We do this *before* the write so that if we fail
689 * here we fall back to buffered write
690 */
691 if (mapping->nrpages) {
692 pgoff_t pg_start = offset >> PAGE_CACHE_SHIFT;
693 pgoff_t pg_end = (offset + count - 1) >> PAGE_CACHE_SHIFT;
694
695 retval = invalidate_inode_pages2_range(mapping,
696 pg_start, pg_end);
697 /*
698 * If a page can not be invalidated, fall back
699 * to buffered write.
700 */
701 if (retval) {
702 if (retval == -EBUSY)
703 goto buff_write;
704 goto err_out;
705 }
706 }
707 retval = v9fs_file_write(filp, data, count, offsetp);
708err_out:
709 mutex_unlock(&inode->i_mutex);
710 return retval;
711
712buff_write:
713 mutex_unlock(&inode->i_mutex);
714 return do_sync_write(filp, data, count, offsetp);
715}
716
717/**
718 * v9fs_cached_file_write - write to a file
719 * @filp: file pointer to write
720 * @data: data buffer to write data from
721 * @count: size of buffer
722 * @offset: offset at which to write data
723 *
724 */
725static ssize_t
726v9fs_cached_file_write(struct file *filp, const char __user * data,
727 size_t count, loff_t *offset)
728{
729
730 if (filp->f_flags & O_DIRECT)
731 return v9fs_direct_write(filp, data, count, offset);
732 return do_sync_write(filp, data, count, offset);
733}
734
Aneesh Kumar K.V7263ceb2011-02-28 17:03:58 +0530735static const struct vm_operations_struct v9fs_file_vm_ops = {
736 .fault = filemap_fault,
737 .page_mkwrite = v9fs_vm_page_mkwrite,
Konstantin Khlebnikov0b173bc2012-10-08 16:28:46 -0700738 .remap_pages = generic_file_remap_pages,
Aneesh Kumar K.V7263ceb2011-02-28 17:03:58 +0530739};
740
Aneesh Kumar K.Ve959b542011-02-28 17:04:04 +0530741
Aneesh Kumar K.V29236f42011-02-28 17:03:54 +0530742const struct file_operations v9fs_cached_file_operations = {
Eric Van Hensbergene03abc02007-02-11 13:21:39 -0600743 .llseek = generic_file_llseek,
Aneesh Kumar K.Ve959b542011-02-28 17:04:04 +0530744 .read = v9fs_cached_file_read,
745 .write = v9fs_cached_file_write,
Eric Van Hensbergene03abc02007-02-11 13:21:39 -0600746 .aio_read = generic_file_aio_read,
Aneesh Kumar K.V7263ceb2011-02-28 17:03:58 +0530747 .aio_write = generic_file_aio_write,
Eric Van Hensbergene03abc02007-02-11 13:21:39 -0600748 .open = v9fs_file_open,
749 .release = v9fs_dir_release,
750 .lock = v9fs_file_lock,
Aneesh Kumar K.V7263ceb2011-02-28 17:03:58 +0530751 .mmap = v9fs_file_mmap,
M. Mohan Kumar7a4439c2010-02-08 15:36:48 -0600752 .fsync = v9fs_file_fsync,
Eric Van Hensbergene03abc02007-02-11 13:21:39 -0600753};
754
Aneesh Kumar K.V29236f42011-02-28 17:03:54 +0530755const struct file_operations v9fs_cached_file_operations_dotl = {
Venkateswararao Jujjuri (JV)b04faaf2010-09-22 16:30:52 -0700756 .llseek = generic_file_llseek,
Aneesh Kumar K.Ve959b542011-02-28 17:04:04 +0530757 .read = v9fs_cached_file_read,
758 .write = v9fs_cached_file_write,
Venkateswararao Jujjuri (JV)b04faaf2010-09-22 16:30:52 -0700759 .aio_read = generic_file_aio_read,
Aneesh Kumar K.V7263ceb2011-02-28 17:03:58 +0530760 .aio_write = generic_file_aio_write,
Venkateswararao Jujjuri (JV)b04faaf2010-09-22 16:30:52 -0700761 .open = v9fs_file_open,
762 .release = v9fs_dir_release,
M. Mohan Kumara0990272010-09-27 11:34:24 +0530763 .lock = v9fs_file_lock_dotl,
764 .flock = v9fs_file_flock_dotl,
Aneesh Kumar K.V7263ceb2011-02-28 17:03:58 +0530765 .mmap = v9fs_file_mmap,
Venkateswararao Jujjuri (JV)920e65d2010-09-22 17:19:19 -0700766 .fsync = v9fs_file_fsync_dotl,
Venkateswararao Jujjuri (JV)b04faaf2010-09-22 16:30:52 -0700767};
768
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -0800769const struct file_operations v9fs_file_operations = {
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700770 .llseek = generic_file_llseek,
771 .read = v9fs_file_read,
772 .write = v9fs_file_write,
773 .open = v9fs_file_open,
774 .release = v9fs_dir_release,
775 .lock = v9fs_file_lock,
Eric Van Hensbergen14b88692008-02-06 19:25:05 -0600776 .mmap = generic_file_readonly_mmap,
M. Mohan Kumar7a4439c2010-02-08 15:36:48 -0600777 .fsync = v9fs_file_fsync,
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700778};
Sripathi Kodi9b6533c2010-03-25 12:41:54 +0000779
780const struct file_operations v9fs_file_operations_dotl = {
781 .llseek = generic_file_llseek,
782 .read = v9fs_file_read,
783 .write = v9fs_file_write,
784 .open = v9fs_file_open,
785 .release = v9fs_dir_release,
M. Mohan Kumara0990272010-09-27 11:34:24 +0530786 .lock = v9fs_file_lock_dotl,
787 .flock = v9fs_file_flock_dotl,
Sripathi Kodi9b6533c2010-03-25 12:41:54 +0000788 .mmap = generic_file_readonly_mmap,
Venkateswararao Jujjuri (JV)920e65d2010-09-22 17:19:19 -0700789 .fsync = v9fs_file_fsync_dotl,
Sripathi Kodi9b6533c2010-03-25 12:41:54 +0000790};