blob: 520c11c2dcca4c9ff31a591600ca0c8ced52481c [file] [log] [blame]
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;
Dominique Martinetfb89b452014-01-10 13:44:09 +010048static const struct vm_operations_struct v9fs_mmap_file_vm_ops;
Aneesh Kumar K.V7263ceb2011-02-28 17:03:58 +053049
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -070050/**
51 * v9fs_file_open - open a file (or directory)
52 * @inode: inode to be opened
53 * @file: file being opened
54 *
55 */
56
57int v9fs_file_open(struct inode *inode, struct file *file)
58{
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -080059 int err;
Aneesh Kumar K.V6b39f6d2011-02-28 17:04:03 +053060 struct v9fs_inode *v9inode;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -050061 struct v9fs_session_info *v9ses;
62 struct p9_fid *fid;
63 int omode;
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -070064
Joe Perches5d385152011-11-28 10:40:46 -080065 p9_debug(P9_DEBUG_VFS, "inode: %p file: %p\n", inode, file);
Aneesh Kumar K.V6b39f6d2011-02-28 17:04:03 +053066 v9inode = V9FS_I(inode);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -050067 v9ses = v9fs_inode2v9ses(inode);
M. Mohan Kumaref565472010-06-22 19:47:50 +053068 if (v9fs_proto_dotl(v9ses))
Aneesh Kumar K.Vf88657c2011-08-03 19:55:32 +053069 omode = v9fs_open_to_dotl_flags(file->f_flags);
M. Mohan Kumaref565472010-06-22 19:47:50 +053070 else
71 omode = v9fs_uflags2omode(file->f_flags,
72 v9fs_proto_dotu(v9ses));
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -050073 fid = file->private_data;
74 if (!fid) {
75 fid = v9fs_fid_clone(file->f_path.dentry);
76 if (IS_ERR(fid))
77 return PTR_ERR(fid);
78
79 err = p9_client_open(fid, omode);
Eric Van Hensbergen9523a842007-07-13 13:01:27 -050080 if (err < 0) {
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -050081 p9_client_clunk(fid);
82 return err;
83 }
M. Mohan Kumaref565472010-06-22 19:47:50 +053084 if ((file->f_flags & O_APPEND) &&
85 (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses)))
Eric Van Hensbergen2e4bef42008-06-24 17:39:39 -050086 generic_file_llseek(file, 0, SEEK_END);
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -080087 }
88
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -050089 file->private_data = fid;
Aneesh Kumar K.V5a7e0a82011-03-08 16:39:46 +053090 mutex_lock(&v9inode->v_mutex);
Dominique Martinetfb89b452014-01-10 13:44:09 +010091 if ((v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) &&
92 !v9inode->writeback_fid &&
Aneesh Kumar K.V7add6972011-03-08 16:39:49 +053093 ((file->f_flags & O_ACCMODE) != O_RDONLY)) {
Aneesh Kumar K.V3cf387d2011-02-28 17:03:57 +053094 /*
Aneesh Kumar K.V6b39f6d2011-02-28 17:04:03 +053095 * clone a fid and add it to writeback_fid
Aneesh Kumar K.V3cf387d2011-02-28 17:03:57 +053096 * we do it during open time instead of
97 * page dirty time via write_begin/page_mkwrite
98 * because we want write after unlink usecase
99 * to work.
100 */
101 fid = v9fs_writeback_fid(file->f_path.dentry);
102 if (IS_ERR(fid)) {
103 err = PTR_ERR(fid);
Aneesh Kumar K.V5a7e0a82011-03-08 16:39:46 +0530104 mutex_unlock(&v9inode->v_mutex);
Aneesh Kumar K.V3cf387d2011-02-28 17:03:57 +0530105 goto out_error;
106 }
Aneesh Kumar K.V6b39f6d2011-02-28 17:04:03 +0530107 v9inode->writeback_fid = (void *) fid;
Aneesh Kumar K.V3cf387d2011-02-28 17:03:57 +0530108 }
Aneesh Kumar K.V5a7e0a82011-03-08 16:39:46 +0530109 mutex_unlock(&v9inode->v_mutex);
Dominique Martinetfb89b452014-01-10 13:44:09 +0100110 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500111 v9fs_cache_inode_set_cookie(inode, file);
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;
Will Deacon50192ab2013-08-21 18:24:47 +0100186 flock.client_id = fid->clnt->name;
M. Mohan Kumara0990272010-09-27 11:34:24 +0530187 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;
Will Deacon50192ab2013-08-21 18:24:47 +0100263 glock.client_id = fid->clnt->name;
M. Mohan Kumar1d769cd2010-09-27 12:22:13 +0530264
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 */
M. Mohan Kumara0990272010-09-27 11:34:24 +0530355 fl->fl_flags |= FL_POSIX;
356 fl->fl_flags ^= FL_FLOCK;
357
358 if (IS_SETLK(cmd) | IS_SETLKW(cmd))
359 ret = v9fs_file_do_lock(filp, cmd, fl);
360 else
361 ret = -EINVAL;
362out_err:
363 return ret;
364}
365
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700366/**
Aneesh Kumar K.V17311772011-02-28 17:03:56 +0530367 * v9fs_fid_readn - read from a fid
368 * @fid: fid to read
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700369 * @data: data buffer to read data into
Eric Van Hensbergenfbedadc2008-10-13 20:36:16 -0500370 * @udata: user data buffer to read data into
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700371 * @count: size of buffer
372 * @offset: offset at which to read data
373 *
374 */
Eric Van Hensbergenfbedadc2008-10-13 20:36:16 -0500375ssize_t
Aneesh Kumar K.V17311772011-02-28 17:03:56 +0530376v9fs_fid_readn(struct p9_fid *fid, char *data, char __user *udata, u32 count,
Eric Van Hensbergenfbedadc2008-10-13 20:36:16 -0500377 u64 offset)
378{
M. Mohan Kumar97e84422010-06-04 11:59:07 +0000379 int n, total, size;
Eric Van Hensbergenfbedadc2008-10-13 20:36:16 -0500380
Joe Perches5d385152011-11-28 10:40:46 -0800381 p9_debug(P9_DEBUG_VFS, "fid %d offset %llu count %d\n",
382 fid->fid, (long long unsigned)offset, count);
Eric Van Hensbergenfbedadc2008-10-13 20:36:16 -0500383 n = 0;
384 total = 0;
M. Mohan Kumar97e84422010-06-04 11:59:07 +0000385 size = fid->iounit ? fid->iounit : fid->clnt->msize - P9_IOHDRSZ;
Eric Van Hensbergenfbedadc2008-10-13 20:36:16 -0500386 do {
387 n = p9_client_read(fid, data, udata, offset, count);
388 if (n <= 0)
389 break;
390
391 if (data)
392 data += n;
393 if (udata)
394 udata += n;
395
396 offset += n;
397 count -= n;
398 total += n;
M. Mohan Kumar97e84422010-06-04 11:59:07 +0000399 } while (count > 0 && n == size);
Eric Van Hensbergenfbedadc2008-10-13 20:36:16 -0500400
401 if (n < 0)
402 total = n;
403
404 return total;
405}
406
407/**
Aneesh Kumar K.V17311772011-02-28 17:03:56 +0530408 * v9fs_file_readn - read from a file
409 * @filp: file pointer to read
410 * @data: data buffer to read data into
411 * @udata: user data buffer to read data into
412 * @count: size of buffer
413 * @offset: offset at which to read data
414 *
415 */
416ssize_t
417v9fs_file_readn(struct file *filp, char *data, char __user *udata, u32 count,
418 u64 offset)
419{
420 return v9fs_fid_readn(filp->private_data, data, udata, count, offset);
421}
422
423/**
Eric Van Hensbergenfbedadc2008-10-13 20:36:16 -0500424 * v9fs_file_read - read from a file
425 * @filp: file pointer to read
426 * @udata: user data buffer to read data into
427 * @count: size of buffer
428 * @offset: offset at which to read data
429 *
430 */
431
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700432static ssize_t
Eric Van Hensbergenfbedadc2008-10-13 20:36:16 -0500433v9fs_file_read(struct file *filp, char __user *udata, size_t count,
Latchesar Ionkov19cba8a2005-10-11 08:29:03 -0700434 loff_t * offset)
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700435{
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500436 int ret;
437 struct p9_fid *fid;
M. Mohan Kumar97e84422010-06-04 11:59:07 +0000438 size_t size;
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700439
Joe Perches5d385152011-11-28 10:40:46 -0800440 p9_debug(P9_DEBUG_VFS, "count %zu offset %lld\n", count, *offset);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500441 fid = filp->private_data;
Eric Van Hensbergenfbedadc2008-10-13 20:36:16 -0500442
M. Mohan Kumar97e84422010-06-04 11:59:07 +0000443 size = fid->iounit ? fid->iounit : fid->clnt->msize - P9_IOHDRSZ;
444 if (count > size)
Eric Van Hensbergenfbedadc2008-10-13 20:36:16 -0500445 ret = v9fs_file_readn(filp, NULL, udata, count, *offset);
446 else
447 ret = p9_client_read(fid, NULL, udata, *offset, count);
448
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500449 if (ret > 0)
450 *offset += ret;
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700451
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500452 return ret;
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700453}
454
Aneesh Kumar K.V17311772011-02-28 17:03:56 +0530455ssize_t
456v9fs_file_write_internal(struct inode *inode, struct p9_fid *fid,
457 const char __user *data, size_t count,
458 loff_t *offset, int invalidate)
459{
460 int n;
Aneesh Kumar K.Vfa6ea162011-02-28 17:04:04 +0530461 loff_t i_size;
Aneesh Kumar K.V17311772011-02-28 17:03:56 +0530462 size_t total = 0;
Aneesh Kumar K.V17311772011-02-28 17:03:56 +0530463 loff_t origin = *offset;
464 unsigned long pg_start, pg_end;
465
Joe Perches5d385152011-11-28 10:40:46 -0800466 p9_debug(P9_DEBUG_VFS, "data %p count %d offset %x\n",
467 data, (int)count, (int)*offset);
Aneesh Kumar K.V17311772011-02-28 17:03:56 +0530468
Aneesh Kumar K.V17311772011-02-28 17:03:56 +0530469 do {
470 n = p9_client_write(fid, NULL, data+total, origin+total, count);
471 if (n <= 0)
472 break;
473 count -= n;
474 total += n;
475 } while (count > 0);
476
477 if (invalidate && (total > 0)) {
478 pg_start = origin >> PAGE_CACHE_SHIFT;
479 pg_end = (origin + total - 1) >> PAGE_CACHE_SHIFT;
480 if (inode->i_mapping && inode->i_mapping->nrpages)
481 invalidate_inode_pages2_range(inode->i_mapping,
482 pg_start, pg_end);
483 *offset += total;
Aneesh Kumar K.Vfa6ea162011-02-28 17:04:04 +0530484 i_size = i_size_read(inode);
485 if (*offset > i_size) {
486 inode_add_bytes(inode, *offset - i_size);
487 i_size_write(inode, *offset);
488 }
Aneesh Kumar K.V17311772011-02-28 17:03:56 +0530489 }
490 if (n < 0)
491 return n;
492
493 return total;
494}
495
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700496/**
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700497 * v9fs_file_write - write to a file
Eric Van Hensbergenee443992008-03-05 07:08:09 -0600498 * @filp: file pointer to write
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700499 * @data: data buffer to write data from
500 * @count: size of buffer
501 * @offset: offset at which to write data
502 *
503 */
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700504static ssize_t
505v9fs_file_write(struct file *filp, const char __user * data,
Aneesh Kumar K.V17311772011-02-28 17:03:56 +0530506 size_t count, loff_t *offset)
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700507{
Aneesh Kumar K.V17311772011-02-28 17:03:56 +0530508 ssize_t retval = 0;
jvraofc0f2962010-03-08 22:07:02 +0000509 loff_t origin = *offset;
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700510
Eric Van Hensbergendfb0ec22008-10-13 20:36:16 -0500511
Harsh Prateek Bora3834b122010-08-03 11:55:40 +0000512 retval = generic_write_checks(filp, &origin, &count, 0);
513 if (retval)
514 goto out;
515
516 retval = -EINVAL;
517 if ((ssize_t) count < 0)
518 goto out;
519 retval = 0;
520 if (!count)
521 goto out;
522
Al Viro496ad9a2013-01-23 17:07:38 -0500523 retval = v9fs_file_write_internal(file_inode(filp),
Aneesh Kumar K.V17311772011-02-28 17:03:56 +0530524 filp->private_data,
M. Mohan Kumaraaf0ef12011-03-16 21:40:49 +0530525 data, count, &origin, 1);
526 /* update offset on successful write */
527 if (retval > 0)
528 *offset = origin;
Harsh Prateek Bora3834b122010-08-03 11:55:40 +0000529out:
530 return retval;
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700531}
532
Aneesh Kumar K.V7263ceb2011-02-28 17:03:58 +0530533
Josef Bacik02c24a82011-07-16 20:44:56 -0400534static int v9fs_file_fsync(struct file *filp, loff_t start, loff_t end,
535 int datasync)
M. Mohan Kumar7a4439c2010-02-08 15:36:48 -0600536{
537 struct p9_fid *fid;
Josef Bacik02c24a82011-07-16 20:44:56 -0400538 struct inode *inode = filp->f_mapping->host;
M. Mohan Kumar7a4439c2010-02-08 15:36:48 -0600539 struct p9_wstat wstat;
540 int retval;
541
Josef Bacik02c24a82011-07-16 20:44:56 -0400542 retval = filemap_write_and_wait_range(inode->i_mapping, start, end);
543 if (retval)
544 return retval;
545
546 mutex_lock(&inode->i_mutex);
Joe Perches5d385152011-11-28 10:40:46 -0800547 p9_debug(P9_DEBUG_VFS, "filp %p datasync %x\n", filp, datasync);
M. Mohan Kumar7a4439c2010-02-08 15:36:48 -0600548
549 fid = filp->private_data;
550 v9fs_blank_wstat(&wstat);
551
552 retval = p9_client_wstat(fid, &wstat);
Josef Bacik02c24a82011-07-16 20:44:56 -0400553 mutex_unlock(&inode->i_mutex);
554
M. Mohan Kumar7a4439c2010-02-08 15:36:48 -0600555 return retval;
556}
557
Josef Bacik02c24a82011-07-16 20:44:56 -0400558int v9fs_file_fsync_dotl(struct file *filp, loff_t start, loff_t end,
559 int datasync)
Venkateswararao Jujjuri (JV)920e65d2010-09-22 17:19:19 -0700560{
561 struct p9_fid *fid;
Josef Bacik02c24a82011-07-16 20:44:56 -0400562 struct inode *inode = filp->f_mapping->host;
Venkateswararao Jujjuri (JV)920e65d2010-09-22 17:19:19 -0700563 int retval;
564
Josef Bacik02c24a82011-07-16 20:44:56 -0400565 retval = filemap_write_and_wait_range(inode->i_mapping, start, end);
566 if (retval)
567 return retval;
568
569 mutex_lock(&inode->i_mutex);
Joe Perches5d385152011-11-28 10:40:46 -0800570 p9_debug(P9_DEBUG_VFS, "filp %p datasync %x\n", filp, datasync);
Venkateswararao Jujjuri (JV)920e65d2010-09-22 17:19:19 -0700571
572 fid = filp->private_data;
573
Venkateswararao Jujjuri (JV)b165d602010-10-22 10:13:12 -0700574 retval = p9_client_fsync(fid, datasync);
Josef Bacik02c24a82011-07-16 20:44:56 -0400575 mutex_unlock(&inode->i_mutex);
576
Venkateswararao Jujjuri (JV)920e65d2010-09-22 17:19:19 -0700577 return retval;
578}
579
Aneesh Kumar K.V7263ceb2011-02-28 17:03:58 +0530580static int
Dominique Martinetfb89b452014-01-10 13:44:09 +0100581v9fs_file_mmap(struct file *filp, struct vm_area_struct *vma)
Aneesh Kumar K.V7263ceb2011-02-28 17:03:58 +0530582{
583 int retval;
584
Dominique Martinetfb89b452014-01-10 13:44:09 +0100585
586 retval = generic_file_mmap(filp, vma);
Aneesh Kumar K.V7263ceb2011-02-28 17:03:58 +0530587 if (!retval)
588 vma->vm_ops = &v9fs_file_vm_ops;
589
590 return retval;
591}
592
593static int
Dominique Martinetfb89b452014-01-10 13:44:09 +0100594v9fs_mmap_file_mmap(struct file *filp, struct vm_area_struct *vma)
595{
596 int retval;
597 struct inode *inode;
598 struct v9fs_inode *v9inode;
599 struct p9_fid *fid;
600
601 inode = file_inode(filp);
602 v9inode = V9FS_I(inode);
603 mutex_lock(&v9inode->v_mutex);
604 if (!v9inode->writeback_fid &&
605 (vma->vm_flags & VM_WRITE)) {
606 /*
607 * clone a fid and add it to writeback_fid
608 * we do it during mmap instead of
609 * page dirty time via write_begin/page_mkwrite
610 * because we want write after unlink usecase
611 * to work.
612 */
613 fid = v9fs_writeback_fid(filp->f_path.dentry);
614 if (IS_ERR(fid)) {
615 retval = PTR_ERR(fid);
616 mutex_unlock(&v9inode->v_mutex);
617 return retval;
618 }
619 v9inode->writeback_fid = (void *) fid;
620 }
621 mutex_unlock(&v9inode->v_mutex);
622
623 retval = generic_file_mmap(filp, vma);
624 if (!retval)
625 vma->vm_ops = &v9fs_mmap_file_vm_ops;
626
627 return retval;
628}
629
630static int
Aneesh Kumar K.V7263ceb2011-02-28 17:03:58 +0530631v9fs_vm_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
632{
Aneesh Kumar K.V6b39f6d2011-02-28 17:04:03 +0530633 struct v9fs_inode *v9inode;
Aneesh Kumar K.V7263ceb2011-02-28 17:03:58 +0530634 struct page *page = vmf->page;
635 struct file *filp = vma->vm_file;
Al Viro496ad9a2013-01-23 17:07:38 -0500636 struct inode *inode = file_inode(filp);
Aneesh Kumar K.V7263ceb2011-02-28 17:03:58 +0530637
638
Joe Perches5d385152011-11-28 10:40:46 -0800639 p9_debug(P9_DEBUG_VFS, "page %p fid %lx\n",
640 page, (unsigned long)filp->private_data);
Aneesh Kumar K.V7263ceb2011-02-28 17:03:58 +0530641
Jan Kara120c2bc2012-06-12 16:20:25 +0200642 /* Update file times before taking page lock */
643 file_update_time(filp);
644
Aneesh Kumar K.V6b39f6d2011-02-28 17:04:03 +0530645 v9inode = V9FS_I(inode);
Aneesh Kumar K.V7263ceb2011-02-28 17:03:58 +0530646 /* make sure the cache has finished storing the page */
647 v9fs_fscache_wait_on_page_write(inode, page);
Aneesh Kumar K.V6b39f6d2011-02-28 17:04:03 +0530648 BUG_ON(!v9inode->writeback_fid);
Aneesh Kumar K.V7263ceb2011-02-28 17:03:58 +0530649 lock_page(page);
650 if (page->mapping != inode->i_mapping)
651 goto out_unlock;
Darrick J. Wong13575ca2013-02-21 16:42:53 -0800652 wait_for_stable_page(page);
Aneesh Kumar K.V7263ceb2011-02-28 17:03:58 +0530653
654 return VM_FAULT_LOCKED;
655out_unlock:
656 unlock_page(page);
657 return VM_FAULT_NOPAGE;
658}
659
Aneesh Kumar K.Ve959b542011-02-28 17:04:04 +0530660static ssize_t
661v9fs_direct_read(struct file *filp, char __user *udata, size_t count,
662 loff_t *offsetp)
663{
664 loff_t size, offset;
665 struct inode *inode;
666 struct address_space *mapping;
667
668 offset = *offsetp;
669 mapping = filp->f_mapping;
670 inode = mapping->host;
671 if (!count)
672 return 0;
673 size = i_size_read(inode);
674 if (offset < size)
675 filemap_write_and_wait_range(mapping, offset,
676 offset + count - 1);
677
678 return v9fs_file_read(filp, udata, count, offsetp);
679}
680
681/**
682 * v9fs_cached_file_read - read from a file
683 * @filp: file pointer to read
Fabian Frederickfd2916b2014-06-04 16:06:26 -0700684 * @data: user data buffer to read data into
Aneesh Kumar K.Ve959b542011-02-28 17:04:04 +0530685 * @count: size of buffer
686 * @offset: offset at which to read data
687 *
688 */
689static ssize_t
690v9fs_cached_file_read(struct file *filp, char __user *data, size_t count,
691 loff_t *offset)
692{
693 if (filp->f_flags & O_DIRECT)
694 return v9fs_direct_read(filp, data, count, offset);
Al Viroaad4f8b2014-04-02 14:33:16 -0400695 return new_sync_read(filp, data, count, offset);
Aneesh Kumar K.Ve959b542011-02-28 17:04:04 +0530696}
697
Dominique Martinetfb89b452014-01-10 13:44:09 +0100698/**
699 * v9fs_mmap_file_read - read from a file
700 * @filp: file pointer to read
Fabian Frederickfd2916b2014-06-04 16:06:26 -0700701 * @data: user data buffer to read data into
Dominique Martinetfb89b452014-01-10 13:44:09 +0100702 * @count: size of buffer
703 * @offset: offset at which to read data
704 *
705 */
706static ssize_t
707v9fs_mmap_file_read(struct file *filp, char __user *data, size_t count,
708 loff_t *offset)
709{
710 /* TODO: Check if there are dirty pages */
711 return v9fs_file_read(filp, data, count, offset);
712}
713
Aneesh Kumar K.Ve959b542011-02-28 17:04:04 +0530714static ssize_t
715v9fs_direct_write(struct file *filp, const char __user * data,
716 size_t count, loff_t *offsetp)
717{
718 loff_t offset;
719 ssize_t retval;
720 struct inode *inode;
721 struct address_space *mapping;
722
723 offset = *offsetp;
724 mapping = filp->f_mapping;
725 inode = mapping->host;
726 if (!count)
727 return 0;
728
729 mutex_lock(&inode->i_mutex);
730 retval = filemap_write_and_wait_range(mapping, offset,
731 offset + count - 1);
732 if (retval)
733 goto err_out;
734 /*
735 * After a write we want buffered reads to be sure to go to disk to get
736 * the new data. We invalidate clean cached page from the region we're
737 * about to write. We do this *before* the write so that if we fail
738 * here we fall back to buffered write
739 */
740 if (mapping->nrpages) {
741 pgoff_t pg_start = offset >> PAGE_CACHE_SHIFT;
742 pgoff_t pg_end = (offset + count - 1) >> PAGE_CACHE_SHIFT;
743
744 retval = invalidate_inode_pages2_range(mapping,
745 pg_start, pg_end);
746 /*
747 * If a page can not be invalidated, fall back
748 * to buffered write.
749 */
750 if (retval) {
751 if (retval == -EBUSY)
752 goto buff_write;
753 goto err_out;
754 }
755 }
756 retval = v9fs_file_write(filp, data, count, offsetp);
757err_out:
758 mutex_unlock(&inode->i_mutex);
759 return retval;
760
761buff_write:
762 mutex_unlock(&inode->i_mutex);
Al Viro81742022014-04-03 03:17:43 -0400763 return new_sync_write(filp, data, count, offsetp);
Aneesh Kumar K.Ve959b542011-02-28 17:04:04 +0530764}
765
766/**
767 * v9fs_cached_file_write - write to a file
768 * @filp: file pointer to write
769 * @data: data buffer to write data from
770 * @count: size of buffer
771 * @offset: offset at which to write data
772 *
773 */
774static ssize_t
775v9fs_cached_file_write(struct file *filp, const char __user * data,
776 size_t count, loff_t *offset)
777{
778
779 if (filp->f_flags & O_DIRECT)
780 return v9fs_direct_write(filp, data, count, offset);
Al Viro81742022014-04-03 03:17:43 -0400781 return new_sync_write(filp, data, count, offset);
Aneesh Kumar K.Ve959b542011-02-28 17:04:04 +0530782}
783
Dominique Martinetfb89b452014-01-10 13:44:09 +0100784
785/**
786 * v9fs_mmap_file_write - write to a file
787 * @filp: file pointer to write
788 * @data: data buffer to write data from
789 * @count: size of buffer
790 * @offset: offset at which to write data
791 *
792 */
793static ssize_t
794v9fs_mmap_file_write(struct file *filp, const char __user *data,
795 size_t count, loff_t *offset)
796{
797 /*
798 * TODO: invalidate mmaps on filp's inode between
799 * offset and offset+count
800 */
801 return v9fs_file_write(filp, data, count, offset);
802}
803
804static void v9fs_mmap_vm_close(struct vm_area_struct *vma)
805{
806 struct inode *inode;
807
808 struct writeback_control wbc = {
809 .nr_to_write = LONG_MAX,
810 .sync_mode = WB_SYNC_ALL,
811 .range_start = vma->vm_pgoff * PAGE_SIZE,
812 /* absolute end, byte at end included */
813 .range_end = vma->vm_pgoff * PAGE_SIZE +
814 (vma->vm_end - vma->vm_start - 1),
815 };
816
817
818 p9_debug(P9_DEBUG_VFS, "9p VMA close, %p, flushing", vma);
819
820 inode = file_inode(vma->vm_file);
821
822 if (!mapping_cap_writeback_dirty(inode->i_mapping))
823 wbc.nr_to_write = 0;
824
825 might_sleep();
826 sync_inode(inode, &wbc);
827}
828
829
Aneesh Kumar K.V7263ceb2011-02-28 17:03:58 +0530830static const struct vm_operations_struct v9fs_file_vm_ops = {
831 .fault = filemap_fault,
Kirill A. Shutemovf1820362014-04-07 15:37:19 -0700832 .map_pages = filemap_map_pages,
Aneesh Kumar K.V7263ceb2011-02-28 17:03:58 +0530833 .page_mkwrite = v9fs_vm_page_mkwrite,
Konstantin Khlebnikov0b173bc2012-10-08 16:28:46 -0700834 .remap_pages = generic_file_remap_pages,
Aneesh Kumar K.V7263ceb2011-02-28 17:03:58 +0530835};
836
Dominique Martinetfb89b452014-01-10 13:44:09 +0100837static const struct vm_operations_struct v9fs_mmap_file_vm_ops = {
838 .close = v9fs_mmap_vm_close,
839 .fault = filemap_fault,
Kirill A. Shutemovf1820362014-04-07 15:37:19 -0700840 .map_pages = filemap_map_pages,
Dominique Martinetfb89b452014-01-10 13:44:09 +0100841 .page_mkwrite = v9fs_vm_page_mkwrite,
842 .remap_pages = generic_file_remap_pages,
843};
844
Aneesh Kumar K.Ve959b542011-02-28 17:04:04 +0530845
Aneesh Kumar K.V29236f42011-02-28 17:03:54 +0530846const struct file_operations v9fs_cached_file_operations = {
Eric Van Hensbergene03abc02007-02-11 13:21:39 -0600847 .llseek = generic_file_llseek,
Aneesh Kumar K.Ve959b542011-02-28 17:04:04 +0530848 .read = v9fs_cached_file_read,
849 .write = v9fs_cached_file_write,
Al Viroaad4f8b2014-04-02 14:33:16 -0400850 .read_iter = generic_file_read_iter,
Al Viro81742022014-04-03 03:17:43 -0400851 .write_iter = generic_file_write_iter,
Eric Van Hensbergene03abc02007-02-11 13:21:39 -0600852 .open = v9fs_file_open,
853 .release = v9fs_dir_release,
854 .lock = v9fs_file_lock,
Aneesh Kumar K.V7263ceb2011-02-28 17:03:58 +0530855 .mmap = v9fs_file_mmap,
M. Mohan Kumar7a4439c2010-02-08 15:36:48 -0600856 .fsync = v9fs_file_fsync,
Eric Van Hensbergene03abc02007-02-11 13:21:39 -0600857};
858
Aneesh Kumar K.V29236f42011-02-28 17:03:54 +0530859const struct file_operations v9fs_cached_file_operations_dotl = {
Venkateswararao Jujjuri (JV)b04faaf2010-09-22 16:30:52 -0700860 .llseek = generic_file_llseek,
Aneesh Kumar K.Ve959b542011-02-28 17:04:04 +0530861 .read = v9fs_cached_file_read,
862 .write = v9fs_cached_file_write,
Al Viroaad4f8b2014-04-02 14:33:16 -0400863 .read_iter = generic_file_read_iter,
Al Viro81742022014-04-03 03:17:43 -0400864 .write_iter = generic_file_write_iter,
Venkateswararao Jujjuri (JV)b04faaf2010-09-22 16:30:52 -0700865 .open = v9fs_file_open,
866 .release = v9fs_dir_release,
M. Mohan Kumara0990272010-09-27 11:34:24 +0530867 .lock = v9fs_file_lock_dotl,
868 .flock = v9fs_file_flock_dotl,
Aneesh Kumar K.V7263ceb2011-02-28 17:03:58 +0530869 .mmap = v9fs_file_mmap,
Venkateswararao Jujjuri (JV)920e65d2010-09-22 17:19:19 -0700870 .fsync = v9fs_file_fsync_dotl,
Venkateswararao Jujjuri (JV)b04faaf2010-09-22 16:30:52 -0700871};
872
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -0800873const struct file_operations v9fs_file_operations = {
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700874 .llseek = generic_file_llseek,
875 .read = v9fs_file_read,
876 .write = v9fs_file_write,
877 .open = v9fs_file_open,
878 .release = v9fs_dir_release,
879 .lock = v9fs_file_lock,
Eric Van Hensbergen14b88692008-02-06 19:25:05 -0600880 .mmap = generic_file_readonly_mmap,
M. Mohan Kumar7a4439c2010-02-08 15:36:48 -0600881 .fsync = v9fs_file_fsync,
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700882};
Sripathi Kodi9b6533c2010-03-25 12:41:54 +0000883
884const struct file_operations v9fs_file_operations_dotl = {
885 .llseek = generic_file_llseek,
886 .read = v9fs_file_read,
887 .write = v9fs_file_write,
888 .open = v9fs_file_open,
889 .release = v9fs_dir_release,
M. Mohan Kumara0990272010-09-27 11:34:24 +0530890 .lock = v9fs_file_lock_dotl,
891 .flock = v9fs_file_flock_dotl,
Sripathi Kodi9b6533c2010-03-25 12:41:54 +0000892 .mmap = generic_file_readonly_mmap,
Venkateswararao Jujjuri (JV)920e65d2010-09-22 17:19:19 -0700893 .fsync = v9fs_file_fsync_dotl,
Sripathi Kodi9b6533c2010-03-25 12:41:54 +0000894};
Dominique Martinetfb89b452014-01-10 13:44:09 +0100895
896const struct file_operations v9fs_mmap_file_operations = {
897 .llseek = generic_file_llseek,
898 .read = v9fs_mmap_file_read,
899 .write = v9fs_mmap_file_write,
900 .open = v9fs_file_open,
901 .release = v9fs_dir_release,
902 .lock = v9fs_file_lock,
903 .mmap = v9fs_mmap_file_mmap,
904 .fsync = v9fs_file_fsync,
905};
906
907const struct file_operations v9fs_mmap_file_operations_dotl = {
908 .llseek = generic_file_llseek,
909 .read = v9fs_mmap_file_read,
910 .write = v9fs_mmap_file_write,
911 .open = v9fs_file_open,
912 .release = v9fs_dir_release,
913 .lock = v9fs_file_lock_dotl,
914 .flock = v9fs_file_flock_dotl,
915 .mmap = v9fs_mmap_file_mmap,
916 .fsync = v9fs_file_fsync_dotl,
917};