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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;
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 */
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;
Aneesh Kumar K.V17311772011-02-28 17:03:56 +0530466 loff_t origin = *offset;
467 unsigned long pg_start, pg_end;
468
Joe Perches5d385152011-11-28 10:40:46 -0800469 p9_debug(P9_DEBUG_VFS, "data %p count %d offset %x\n",
470 data, (int)count, (int)*offset);
Aneesh Kumar K.V17311772011-02-28 17:03:56 +0530471
Aneesh Kumar K.V17311772011-02-28 17:03:56 +0530472 do {
473 n = p9_client_write(fid, NULL, data+total, origin+total, count);
474 if (n <= 0)
475 break;
476 count -= n;
477 total += n;
478 } while (count > 0);
479
480 if (invalidate && (total > 0)) {
481 pg_start = origin >> PAGE_CACHE_SHIFT;
482 pg_end = (origin + total - 1) >> PAGE_CACHE_SHIFT;
483 if (inode->i_mapping && inode->i_mapping->nrpages)
484 invalidate_inode_pages2_range(inode->i_mapping,
485 pg_start, pg_end);
486 *offset += total;
Aneesh Kumar K.Vfa6ea162011-02-28 17:04:04 +0530487 i_size = i_size_read(inode);
488 if (*offset > i_size) {
489 inode_add_bytes(inode, *offset - i_size);
490 i_size_write(inode, *offset);
491 }
Aneesh Kumar K.V17311772011-02-28 17:03:56 +0530492 }
493 if (n < 0)
494 return n;
495
496 return total;
497}
498
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700499/**
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700500 * v9fs_file_write - write to a file
Eric Van Hensbergenee443992008-03-05 07:08:09 -0600501 * @filp: file pointer to write
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700502 * @data: data buffer to write data from
503 * @count: size of buffer
504 * @offset: offset at which to write data
505 *
506 */
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700507static ssize_t
508v9fs_file_write(struct file *filp, const char __user * data,
Aneesh Kumar K.V17311772011-02-28 17:03:56 +0530509 size_t count, loff_t *offset)
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700510{
Aneesh Kumar K.V17311772011-02-28 17:03:56 +0530511 ssize_t retval = 0;
jvraofc0f2962010-03-08 22:07:02 +0000512 loff_t origin = *offset;
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700513
Eric Van Hensbergendfb0ec22008-10-13 20:36:16 -0500514
Harsh Prateek Bora3834b122010-08-03 11:55:40 +0000515 retval = generic_write_checks(filp, &origin, &count, 0);
516 if (retval)
517 goto out;
518
519 retval = -EINVAL;
520 if ((ssize_t) count < 0)
521 goto out;
522 retval = 0;
523 if (!count)
524 goto out;
525
Al Viro496ad9a2013-01-23 17:07:38 -0500526 retval = v9fs_file_write_internal(file_inode(filp),
Aneesh Kumar K.V17311772011-02-28 17:03:56 +0530527 filp->private_data,
M. Mohan Kumaraaf0ef12011-03-16 21:40:49 +0530528 data, count, &origin, 1);
529 /* update offset on successful write */
530 if (retval > 0)
531 *offset = origin;
Harsh Prateek Bora3834b122010-08-03 11:55:40 +0000532out:
533 return retval;
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700534}
535
Aneesh Kumar K.V7263ceb2011-02-28 17:03:58 +0530536
Josef Bacik02c24a82011-07-16 20:44:56 -0400537static int v9fs_file_fsync(struct file *filp, loff_t start, loff_t end,
538 int datasync)
M. Mohan Kumar7a4439c2010-02-08 15:36:48 -0600539{
540 struct p9_fid *fid;
Josef Bacik02c24a82011-07-16 20:44:56 -0400541 struct inode *inode = filp->f_mapping->host;
M. Mohan Kumar7a4439c2010-02-08 15:36:48 -0600542 struct p9_wstat wstat;
543 int retval;
544
Josef Bacik02c24a82011-07-16 20:44:56 -0400545 retval = filemap_write_and_wait_range(inode->i_mapping, start, end);
546 if (retval)
547 return retval;
548
549 mutex_lock(&inode->i_mutex);
Joe Perches5d385152011-11-28 10:40:46 -0800550 p9_debug(P9_DEBUG_VFS, "filp %p datasync %x\n", filp, datasync);
M. Mohan Kumar7a4439c2010-02-08 15:36:48 -0600551
552 fid = filp->private_data;
553 v9fs_blank_wstat(&wstat);
554
555 retval = p9_client_wstat(fid, &wstat);
Josef Bacik02c24a82011-07-16 20:44:56 -0400556 mutex_unlock(&inode->i_mutex);
557
M. Mohan Kumar7a4439c2010-02-08 15:36:48 -0600558 return retval;
559}
560
Josef Bacik02c24a82011-07-16 20:44:56 -0400561int v9fs_file_fsync_dotl(struct file *filp, loff_t start, loff_t end,
562 int datasync)
Venkateswararao Jujjuri (JV)920e65d2010-09-22 17:19:19 -0700563{
564 struct p9_fid *fid;
Josef Bacik02c24a82011-07-16 20:44:56 -0400565 struct inode *inode = filp->f_mapping->host;
Venkateswararao Jujjuri (JV)920e65d2010-09-22 17:19:19 -0700566 int retval;
567
Josef Bacik02c24a82011-07-16 20:44:56 -0400568 retval = filemap_write_and_wait_range(inode->i_mapping, start, end);
569 if (retval)
570 return retval;
571
572 mutex_lock(&inode->i_mutex);
Joe Perches5d385152011-11-28 10:40:46 -0800573 p9_debug(P9_DEBUG_VFS, "filp %p datasync %x\n", filp, datasync);
Venkateswararao Jujjuri (JV)920e65d2010-09-22 17:19:19 -0700574
575 fid = filp->private_data;
576
Venkateswararao Jujjuri (JV)b165d602010-10-22 10:13:12 -0700577 retval = p9_client_fsync(fid, datasync);
Josef Bacik02c24a82011-07-16 20:44:56 -0400578 mutex_unlock(&inode->i_mutex);
579
Venkateswararao Jujjuri (JV)920e65d2010-09-22 17:19:19 -0700580 return retval;
581}
582
Aneesh Kumar K.V7263ceb2011-02-28 17:03:58 +0530583static int
Dominique Martinetfb89b452014-01-10 13:44:09 +0100584v9fs_file_mmap(struct file *filp, struct vm_area_struct *vma)
Aneesh Kumar K.V7263ceb2011-02-28 17:03:58 +0530585{
586 int retval;
587
Dominique Martinetfb89b452014-01-10 13:44:09 +0100588
589 retval = generic_file_mmap(filp, vma);
Aneesh Kumar K.V7263ceb2011-02-28 17:03:58 +0530590 if (!retval)
591 vma->vm_ops = &v9fs_file_vm_ops;
592
593 return retval;
594}
595
596static int
Dominique Martinetfb89b452014-01-10 13:44:09 +0100597v9fs_mmap_file_mmap(struct file *filp, struct vm_area_struct *vma)
598{
599 int retval;
600 struct inode *inode;
601 struct v9fs_inode *v9inode;
602 struct p9_fid *fid;
603
604 inode = file_inode(filp);
605 v9inode = V9FS_I(inode);
606 mutex_lock(&v9inode->v_mutex);
607 if (!v9inode->writeback_fid &&
608 (vma->vm_flags & VM_WRITE)) {
609 /*
610 * clone a fid and add it to writeback_fid
611 * we do it during mmap instead of
612 * page dirty time via write_begin/page_mkwrite
613 * because we want write after unlink usecase
614 * to work.
615 */
616 fid = v9fs_writeback_fid(filp->f_path.dentry);
617 if (IS_ERR(fid)) {
618 retval = PTR_ERR(fid);
619 mutex_unlock(&v9inode->v_mutex);
620 return retval;
621 }
622 v9inode->writeback_fid = (void *) fid;
623 }
624 mutex_unlock(&v9inode->v_mutex);
625
626 retval = generic_file_mmap(filp, vma);
627 if (!retval)
628 vma->vm_ops = &v9fs_mmap_file_vm_ops;
629
630 return retval;
631}
632
633static int
Aneesh Kumar K.V7263ceb2011-02-28 17:03:58 +0530634v9fs_vm_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
635{
Aneesh Kumar K.V6b39f6d2011-02-28 17:04:03 +0530636 struct v9fs_inode *v9inode;
Aneesh Kumar K.V7263ceb2011-02-28 17:03:58 +0530637 struct page *page = vmf->page;
638 struct file *filp = vma->vm_file;
Al Viro496ad9a2013-01-23 17:07:38 -0500639 struct inode *inode = file_inode(filp);
Aneesh Kumar K.V7263ceb2011-02-28 17:03:58 +0530640
641
Joe Perches5d385152011-11-28 10:40:46 -0800642 p9_debug(P9_DEBUG_VFS, "page %p fid %lx\n",
643 page, (unsigned long)filp->private_data);
Aneesh Kumar K.V7263ceb2011-02-28 17:03:58 +0530644
Jan Kara120c2bc2012-06-12 16:20:25 +0200645 /* Update file times before taking page lock */
646 file_update_time(filp);
647
Aneesh Kumar K.V6b39f6d2011-02-28 17:04:03 +0530648 v9inode = V9FS_I(inode);
Aneesh Kumar K.V7263ceb2011-02-28 17:03:58 +0530649 /* make sure the cache has finished storing the page */
650 v9fs_fscache_wait_on_page_write(inode, page);
Aneesh Kumar K.V6b39f6d2011-02-28 17:04:03 +0530651 BUG_ON(!v9inode->writeback_fid);
Aneesh Kumar K.V7263ceb2011-02-28 17:03:58 +0530652 lock_page(page);
653 if (page->mapping != inode->i_mapping)
654 goto out_unlock;
Darrick J. Wong13575ca2013-02-21 16:42:53 -0800655 wait_for_stable_page(page);
Aneesh Kumar K.V7263ceb2011-02-28 17:03:58 +0530656
657 return VM_FAULT_LOCKED;
658out_unlock:
659 unlock_page(page);
660 return VM_FAULT_NOPAGE;
661}
662
Aneesh Kumar K.Ve959b542011-02-28 17:04:04 +0530663static ssize_t
664v9fs_direct_read(struct file *filp, char __user *udata, size_t count,
665 loff_t *offsetp)
666{
667 loff_t size, offset;
668 struct inode *inode;
669 struct address_space *mapping;
670
671 offset = *offsetp;
672 mapping = filp->f_mapping;
673 inode = mapping->host;
674 if (!count)
675 return 0;
676 size = i_size_read(inode);
677 if (offset < size)
678 filemap_write_and_wait_range(mapping, offset,
679 offset + count - 1);
680
681 return v9fs_file_read(filp, udata, count, offsetp);
682}
683
684/**
685 * v9fs_cached_file_read - read from a file
686 * @filp: file pointer to read
687 * @udata: user data buffer to read data into
688 * @count: size of buffer
689 * @offset: offset at which to read data
690 *
691 */
692static ssize_t
693v9fs_cached_file_read(struct file *filp, char __user *data, size_t count,
694 loff_t *offset)
695{
696 if (filp->f_flags & O_DIRECT)
697 return v9fs_direct_read(filp, data, count, offset);
Al Viroaad4f8b2014-04-02 14:33:16 -0400698 return new_sync_read(filp, data, count, offset);
Aneesh Kumar K.Ve959b542011-02-28 17:04:04 +0530699}
700
Dominique Martinetfb89b452014-01-10 13:44:09 +0100701/**
702 * v9fs_mmap_file_read - read from a file
703 * @filp: file pointer to read
704 * @udata: user data buffer to read data into
705 * @count: size of buffer
706 * @offset: offset at which to read data
707 *
708 */
709static ssize_t
710v9fs_mmap_file_read(struct file *filp, char __user *data, size_t count,
711 loff_t *offset)
712{
713 /* TODO: Check if there are dirty pages */
714 return v9fs_file_read(filp, data, count, offset);
715}
716
Aneesh Kumar K.Ve959b542011-02-28 17:04:04 +0530717static ssize_t
718v9fs_direct_write(struct file *filp, const char __user * data,
719 size_t count, loff_t *offsetp)
720{
721 loff_t offset;
722 ssize_t retval;
723 struct inode *inode;
724 struct address_space *mapping;
725
726 offset = *offsetp;
727 mapping = filp->f_mapping;
728 inode = mapping->host;
729 if (!count)
730 return 0;
731
732 mutex_lock(&inode->i_mutex);
733 retval = filemap_write_and_wait_range(mapping, offset,
734 offset + count - 1);
735 if (retval)
736 goto err_out;
737 /*
738 * After a write we want buffered reads to be sure to go to disk to get
739 * the new data. We invalidate clean cached page from the region we're
740 * about to write. We do this *before* the write so that if we fail
741 * here we fall back to buffered write
742 */
743 if (mapping->nrpages) {
744 pgoff_t pg_start = offset >> PAGE_CACHE_SHIFT;
745 pgoff_t pg_end = (offset + count - 1) >> PAGE_CACHE_SHIFT;
746
747 retval = invalidate_inode_pages2_range(mapping,
748 pg_start, pg_end);
749 /*
750 * If a page can not be invalidated, fall back
751 * to buffered write.
752 */
753 if (retval) {
754 if (retval == -EBUSY)
755 goto buff_write;
756 goto err_out;
757 }
758 }
759 retval = v9fs_file_write(filp, data, count, offsetp);
760err_out:
761 mutex_unlock(&inode->i_mutex);
762 return retval;
763
764buff_write:
765 mutex_unlock(&inode->i_mutex);
Al Viro81742022014-04-03 03:17:43 -0400766 return new_sync_write(filp, data, count, offsetp);
Aneesh Kumar K.Ve959b542011-02-28 17:04:04 +0530767}
768
769/**
770 * v9fs_cached_file_write - write to a file
771 * @filp: file pointer to write
772 * @data: data buffer to write data from
773 * @count: size of buffer
774 * @offset: offset at which to write data
775 *
776 */
777static ssize_t
778v9fs_cached_file_write(struct file *filp, const char __user * data,
779 size_t count, loff_t *offset)
780{
781
782 if (filp->f_flags & O_DIRECT)
783 return v9fs_direct_write(filp, data, count, offset);
Al Viro81742022014-04-03 03:17:43 -0400784 return new_sync_write(filp, data, count, offset);
Aneesh Kumar K.Ve959b542011-02-28 17:04:04 +0530785}
786
Dominique Martinetfb89b452014-01-10 13:44:09 +0100787
788/**
789 * v9fs_mmap_file_write - write to a file
790 * @filp: file pointer to write
791 * @data: data buffer to write data from
792 * @count: size of buffer
793 * @offset: offset at which to write data
794 *
795 */
796static ssize_t
797v9fs_mmap_file_write(struct file *filp, const char __user *data,
798 size_t count, loff_t *offset)
799{
800 /*
801 * TODO: invalidate mmaps on filp's inode between
802 * offset and offset+count
803 */
804 return v9fs_file_write(filp, data, count, offset);
805}
806
807static void v9fs_mmap_vm_close(struct vm_area_struct *vma)
808{
809 struct inode *inode;
810
811 struct writeback_control wbc = {
812 .nr_to_write = LONG_MAX,
813 .sync_mode = WB_SYNC_ALL,
814 .range_start = vma->vm_pgoff * PAGE_SIZE,
815 /* absolute end, byte at end included */
816 .range_end = vma->vm_pgoff * PAGE_SIZE +
817 (vma->vm_end - vma->vm_start - 1),
818 };
819
820
821 p9_debug(P9_DEBUG_VFS, "9p VMA close, %p, flushing", vma);
822
823 inode = file_inode(vma->vm_file);
824
825 if (!mapping_cap_writeback_dirty(inode->i_mapping))
826 wbc.nr_to_write = 0;
827
828 might_sleep();
829 sync_inode(inode, &wbc);
830}
831
832
Aneesh Kumar K.V7263ceb2011-02-28 17:03:58 +0530833static const struct vm_operations_struct v9fs_file_vm_ops = {
834 .fault = filemap_fault,
Kirill A. Shutemovf1820362014-04-07 15:37:19 -0700835 .map_pages = filemap_map_pages,
Aneesh Kumar K.V7263ceb2011-02-28 17:03:58 +0530836 .page_mkwrite = v9fs_vm_page_mkwrite,
Konstantin Khlebnikov0b173bc2012-10-08 16:28:46 -0700837 .remap_pages = generic_file_remap_pages,
Aneesh Kumar K.V7263ceb2011-02-28 17:03:58 +0530838};
839
Dominique Martinetfb89b452014-01-10 13:44:09 +0100840static const struct vm_operations_struct v9fs_mmap_file_vm_ops = {
841 .close = v9fs_mmap_vm_close,
842 .fault = filemap_fault,
Kirill A. Shutemovf1820362014-04-07 15:37:19 -0700843 .map_pages = filemap_map_pages,
Dominique Martinetfb89b452014-01-10 13:44:09 +0100844 .page_mkwrite = v9fs_vm_page_mkwrite,
845 .remap_pages = generic_file_remap_pages,
846};
847
Aneesh Kumar K.Ve959b542011-02-28 17:04:04 +0530848
Aneesh Kumar K.V29236f42011-02-28 17:03:54 +0530849const struct file_operations v9fs_cached_file_operations = {
Eric Van Hensbergene03abc02007-02-11 13:21:39 -0600850 .llseek = generic_file_llseek,
Aneesh Kumar K.Ve959b542011-02-28 17:04:04 +0530851 .read = v9fs_cached_file_read,
852 .write = v9fs_cached_file_write,
Al Viroaad4f8b2014-04-02 14:33:16 -0400853 .read_iter = generic_file_read_iter,
Al Viro81742022014-04-03 03:17:43 -0400854 .write_iter = generic_file_write_iter,
Eric Van Hensbergene03abc02007-02-11 13:21:39 -0600855 .open = v9fs_file_open,
856 .release = v9fs_dir_release,
857 .lock = v9fs_file_lock,
Aneesh Kumar K.V7263ceb2011-02-28 17:03:58 +0530858 .mmap = v9fs_file_mmap,
M. Mohan Kumar7a4439c2010-02-08 15:36:48 -0600859 .fsync = v9fs_file_fsync,
Eric Van Hensbergene03abc02007-02-11 13:21:39 -0600860};
861
Aneesh Kumar K.V29236f42011-02-28 17:03:54 +0530862const struct file_operations v9fs_cached_file_operations_dotl = {
Venkateswararao Jujjuri (JV)b04faaf2010-09-22 16:30:52 -0700863 .llseek = generic_file_llseek,
Aneesh Kumar K.Ve959b542011-02-28 17:04:04 +0530864 .read = v9fs_cached_file_read,
865 .write = v9fs_cached_file_write,
Al Viroaad4f8b2014-04-02 14:33:16 -0400866 .read_iter = generic_file_read_iter,
Al Viro81742022014-04-03 03:17:43 -0400867 .write_iter = generic_file_write_iter,
Venkateswararao Jujjuri (JV)b04faaf2010-09-22 16:30:52 -0700868 .open = v9fs_file_open,
869 .release = v9fs_dir_release,
M. Mohan Kumara0990272010-09-27 11:34:24 +0530870 .lock = v9fs_file_lock_dotl,
871 .flock = v9fs_file_flock_dotl,
Aneesh Kumar K.V7263ceb2011-02-28 17:03:58 +0530872 .mmap = v9fs_file_mmap,
Venkateswararao Jujjuri (JV)920e65d2010-09-22 17:19:19 -0700873 .fsync = v9fs_file_fsync_dotl,
Venkateswararao Jujjuri (JV)b04faaf2010-09-22 16:30:52 -0700874};
875
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -0800876const struct file_operations v9fs_file_operations = {
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700877 .llseek = generic_file_llseek,
878 .read = v9fs_file_read,
879 .write = v9fs_file_write,
880 .open = v9fs_file_open,
881 .release = v9fs_dir_release,
882 .lock = v9fs_file_lock,
Eric Van Hensbergen14b88692008-02-06 19:25:05 -0600883 .mmap = generic_file_readonly_mmap,
M. Mohan Kumar7a4439c2010-02-08 15:36:48 -0600884 .fsync = v9fs_file_fsync,
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700885};
Sripathi Kodi9b6533c2010-03-25 12:41:54 +0000886
887const struct file_operations v9fs_file_operations_dotl = {
888 .llseek = generic_file_llseek,
889 .read = v9fs_file_read,
890 .write = v9fs_file_write,
891 .open = v9fs_file_open,
892 .release = v9fs_dir_release,
M. Mohan Kumara0990272010-09-27 11:34:24 +0530893 .lock = v9fs_file_lock_dotl,
894 .flock = v9fs_file_flock_dotl,
Sripathi Kodi9b6533c2010-03-25 12:41:54 +0000895 .mmap = generic_file_readonly_mmap,
Venkateswararao Jujjuri (JV)920e65d2010-09-22 17:19:19 -0700896 .fsync = v9fs_file_fsync_dotl,
Sripathi Kodi9b6533c2010-03-25 12:41:54 +0000897};
Dominique Martinetfb89b452014-01-10 13:44:09 +0100898
899const struct file_operations v9fs_mmap_file_operations = {
900 .llseek = generic_file_llseek,
901 .read = v9fs_mmap_file_read,
902 .write = v9fs_mmap_file_write,
903 .open = v9fs_file_open,
904 .release = v9fs_dir_release,
905 .lock = v9fs_file_lock,
906 .mmap = v9fs_mmap_file_mmap,
907 .fsync = v9fs_file_fsync,
908};
909
910const struct file_operations v9fs_mmap_file_operations_dotl = {
911 .llseek = generic_file_llseek,
912 .read = v9fs_mmap_file_read,
913 .write = v9fs_mmap_file_write,
914 .open = v9fs_file_open,
915 .release = v9fs_dir_release,
916 .lock = v9fs_file_lock_dotl,
917 .flock = v9fs_file_flock_dotl,
918 .mmap = v9fs_mmap_file_mmap,
919 .fsync = v9fs_file_fsync_dotl,
920};