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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>
Linus Torvalds7c0f6ba2016-12-24 11:46:01 -080037#include <linux/uaccess.h>
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -070038#include <linux/idr.h>
Al Viro070b3652015-04-01 20:17:51 -040039#include <linux/uio.h>
Al Viroce85dd52015-04-02 12:02:03 -040040#include <linux/slab.h>
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -050041#include <net/9p/9p.h>
42#include <net/9p/client.h>
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -070043
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -070044#include "v9fs.h"
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -070045#include "v9fs_vfs.h"
46#include "fid.h"
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -050047#include "cache.h"
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -070048
Aneesh Kumar K.V7263ceb2011-02-28 17:03:58 +053049static const struct vm_operations_struct v9fs_file_vm_ops;
Dominique Martinetfb89b452014-01-10 13:44:09 +010050static const struct vm_operations_struct v9fs_mmap_file_vm_ops;
Aneesh Kumar K.V7263ceb2011-02-28 17:03:58 +053051
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -070052/**
53 * v9fs_file_open - open a file (or directory)
54 * @inode: inode to be opened
55 * @file: file being opened
56 *
57 */
58
59int v9fs_file_open(struct inode *inode, struct file *file)
60{
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -080061 int err;
Aneesh Kumar K.V6b39f6d2011-02-28 17:04:03 +053062 struct v9fs_inode *v9inode;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -050063 struct v9fs_session_info *v9ses;
64 struct p9_fid *fid;
65 int omode;
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -070066
Joe Perches5d385152011-11-28 10:40:46 -080067 p9_debug(P9_DEBUG_VFS, "inode: %p file: %p\n", inode, file);
Aneesh Kumar K.V6b39f6d2011-02-28 17:04:03 +053068 v9inode = V9FS_I(inode);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -050069 v9ses = v9fs_inode2v9ses(inode);
M. Mohan Kumaref565472010-06-22 19:47:50 +053070 if (v9fs_proto_dotl(v9ses))
Aneesh Kumar K.Vf88657c2011-08-03 19:55:32 +053071 omode = v9fs_open_to_dotl_flags(file->f_flags);
M. Mohan Kumaref565472010-06-22 19:47:50 +053072 else
73 omode = v9fs_uflags2omode(file->f_flags,
74 v9fs_proto_dotu(v9ses));
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -050075 fid = file->private_data;
76 if (!fid) {
Miklos Szeredib403f0e2016-06-29 10:54:23 +020077 fid = v9fs_fid_clone(file_dentry(file));
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -050078 if (IS_ERR(fid))
79 return PTR_ERR(fid);
80
81 err = p9_client_open(fid, omode);
Eric Van Hensbergen9523a842007-07-13 13:01:27 -050082 if (err < 0) {
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -050083 p9_client_clunk(fid);
84 return err;
85 }
M. Mohan Kumaref565472010-06-22 19:47:50 +053086 if ((file->f_flags & O_APPEND) &&
87 (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses)))
Eric Van Hensbergen2e4bef42008-06-24 17:39:39 -050088 generic_file_llseek(file, 0, SEEK_END);
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -080089 }
90
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -050091 file->private_data = fid;
Aneesh Kumar K.V5a7e0a82011-03-08 16:39:46 +053092 mutex_lock(&v9inode->v_mutex);
Dominique Martinetfb89b452014-01-10 13:44:09 +010093 if ((v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) &&
94 !v9inode->writeback_fid &&
Aneesh Kumar K.V7add6972011-03-08 16:39:49 +053095 ((file->f_flags & O_ACCMODE) != O_RDONLY)) {
Aneesh Kumar K.V3cf387d2011-02-28 17:03:57 +053096 /*
Aneesh Kumar K.V6b39f6d2011-02-28 17:04:03 +053097 * clone a fid and add it to writeback_fid
Aneesh Kumar K.V3cf387d2011-02-28 17:03:57 +053098 * we do it during open time instead of
99 * page dirty time via write_begin/page_mkwrite
100 * because we want write after unlink usecase
101 * to work.
102 */
Miklos Szeredib403f0e2016-06-29 10:54:23 +0200103 fid = v9fs_writeback_fid(file_dentry(file));
Aneesh Kumar K.V3cf387d2011-02-28 17:03:57 +0530104 if (IS_ERR(fid)) {
105 err = PTR_ERR(fid);
Aneesh Kumar K.V5a7e0a82011-03-08 16:39:46 +0530106 mutex_unlock(&v9inode->v_mutex);
Aneesh Kumar K.V3cf387d2011-02-28 17:03:57 +0530107 goto out_error;
108 }
Aneesh Kumar K.V6b39f6d2011-02-28 17:04:03 +0530109 v9inode->writeback_fid = (void *) fid;
Aneesh Kumar K.V3cf387d2011-02-28 17:03:57 +0530110 }
Aneesh Kumar K.V5a7e0a82011-03-08 16:39:46 +0530111 mutex_unlock(&v9inode->v_mutex);
Dominique Martinetfb89b452014-01-10 13:44:09 +0100112 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500113 v9fs_cache_inode_set_cookie(inode, file);
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700114 return 0;
Aneesh Kumar K.V3cf387d2011-02-28 17:03:57 +0530115out_error:
116 p9_client_clunk(file->private_data);
117 file->private_data = NULL;
118 return err;
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700119}
120
121/**
122 * v9fs_file_lock - lock a file (or directory)
Eric Van Hensbergenee443992008-03-05 07:08:09 -0600123 * @filp: file to be locked
124 * @cmd: lock command
125 * @fl: file lock structure
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700126 *
Eric Van Hensbergenee443992008-03-05 07:08:09 -0600127 * Bugs: this looks like a local only lock, we should extend into 9P
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700128 * by using open exclusive
129 */
130
131static int v9fs_file_lock(struct file *filp, int cmd, struct file_lock *fl)
132{
133 int res = 0;
Al Viro496ad9a2013-01-23 17:07:38 -0500134 struct inode *inode = file_inode(filp);
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700135
Joe Perches5d385152011-11-28 10:40:46 -0800136 p9_debug(P9_DEBUG_VFS, "filp: %p lock: %p\n", filp, fl);
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700137
138 /* No mandatory locks */
Sachin Prabhuf78233d2010-03-13 09:03:55 -0600139 if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK)
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700140 return -ENOLCK;
141
142 if ((IS_SETLK(cmd) || IS_SETLKW(cmd)) && fl->fl_type != F_UNLCK) {
OGAWA Hirofumi28fd1292006-01-08 01:02:14 -0800143 filemap_write_and_wait(inode->i_mapping);
Andrew Mortonfc0ecff2007-02-10 01:45:39 -0800144 invalidate_mapping_pages(&inode->i_data, 0, -1);
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700145 }
146
147 return res;
148}
149
M. Mohan Kumara0990272010-09-27 11:34:24 +0530150static int v9fs_file_do_lock(struct file *filp, int cmd, struct file_lock *fl)
151{
152 struct p9_flock flock;
153 struct p9_fid *fid;
Dominique Martinet5c4086b2015-01-09 12:56:07 +0100154 uint8_t status = P9_LOCK_ERROR;
M. Mohan Kumara0990272010-09-27 11:34:24 +0530155 int res = 0;
156 unsigned char fl_type;
157
158 fid = filp->private_data;
159 BUG_ON(fid == NULL);
160
161 if ((fl->fl_flags & FL_POSIX) != FL_POSIX)
162 BUG();
163
Benjamin Coddington4f656362015-10-22 13:38:14 -0400164 res = locks_lock_file_wait(filp, fl);
M. Mohan Kumara0990272010-09-27 11:34:24 +0530165 if (res < 0)
166 goto out;
167
168 /* convert posix lock to p9 tlock args */
169 memset(&flock, 0, sizeof(flock));
Jim Garlick51b8b4f2011-08-21 00:21:18 +0530170 /* map the lock type */
171 switch (fl->fl_type) {
172 case F_RDLCK:
173 flock.type = P9_LOCK_TYPE_RDLCK;
174 break;
175 case F_WRLCK:
176 flock.type = P9_LOCK_TYPE_WRLCK;
177 break;
178 case F_UNLCK:
179 flock.type = P9_LOCK_TYPE_UNLCK;
180 break;
181 }
M. Mohan Kumara0990272010-09-27 11:34:24 +0530182 flock.start = fl->fl_start;
183 if (fl->fl_end == OFFSET_MAX)
184 flock.length = 0;
185 else
186 flock.length = fl->fl_end - fl->fl_start + 1;
187 flock.proc_id = fl->fl_pid;
Will Deacon50192ab2013-08-21 18:24:47 +0100188 flock.client_id = fid->clnt->name;
M. Mohan Kumara0990272010-09-27 11:34:24 +0530189 if (IS_SETLKW(cmd))
190 flock.flags = P9_LOCK_FLAGS_BLOCK;
191
192 /*
193 * if its a blocked request and we get P9_LOCK_BLOCKED as the status
194 * for lock request, keep on trying
195 */
196 for (;;) {
197 res = p9_client_lock_dotl(fid, &flock, &status);
198 if (res < 0)
Kirill A. Shutemovad804922014-12-29 15:00:18 +0200199 goto out_unlock;
M. Mohan Kumara0990272010-09-27 11:34:24 +0530200
201 if (status != P9_LOCK_BLOCKED)
202 break;
203 if (status == P9_LOCK_BLOCKED && !IS_SETLKW(cmd))
204 break;
Jim Garlicka0ea7872012-01-03 15:27:50 -0600205 if (schedule_timeout_interruptible(P9_LOCK_TIMEOUT) != 0)
206 break;
M. Mohan Kumara0990272010-09-27 11:34:24 +0530207 }
208
209 /* map 9p status to VFS status */
210 switch (status) {
211 case P9_LOCK_SUCCESS:
212 res = 0;
213 break;
214 case P9_LOCK_BLOCKED:
215 res = -EAGAIN;
216 break;
Kirill A. Shutemovb642f722014-12-29 15:00:19 +0200217 default:
218 WARN_ONCE(1, "unknown lock status code: %d\n", status);
219 /* fallthough */
M. Mohan Kumara0990272010-09-27 11:34:24 +0530220 case P9_LOCK_ERROR:
221 case P9_LOCK_GRACE:
222 res = -ENOLCK;
223 break;
M. Mohan Kumara0990272010-09-27 11:34:24 +0530224 }
225
Kirill A. Shutemovad804922014-12-29 15:00:18 +0200226out_unlock:
M. Mohan Kumara0990272010-09-27 11:34:24 +0530227 /*
228 * incase server returned error for lock request, revert
229 * it locally
230 */
231 if (res < 0 && fl->fl_type != F_UNLCK) {
232 fl_type = fl->fl_type;
233 fl->fl_type = F_UNLCK;
Dominique Martinetb6478742015-11-05 18:44:21 -0800234 /* Even if this fails we want to return the remote error */
Linus Torvalds2e3078a2015-11-05 23:10:54 -0800235 locks_lock_file_wait(filp, fl);
M. Mohan Kumara0990272010-09-27 11:34:24 +0530236 fl->fl_type = fl_type;
237 }
238out:
239 return res;
240}
241
M. Mohan Kumar1d769cd2010-09-27 12:22:13 +0530242static int v9fs_file_getlock(struct file *filp, struct file_lock *fl)
243{
244 struct p9_getlock glock;
245 struct p9_fid *fid;
246 int res = 0;
247
248 fid = filp->private_data;
249 BUG_ON(fid == NULL);
250
251 posix_test_lock(filp, fl);
252 /*
253 * if we have a conflicting lock locally, no need to validate
254 * with server
255 */
256 if (fl->fl_type != F_UNLCK)
257 return res;
258
259 /* convert posix lock to p9 tgetlock args */
260 memset(&glock, 0, sizeof(glock));
Jim Garlick51b8b4f2011-08-21 00:21:18 +0530261 glock.type = P9_LOCK_TYPE_UNLCK;
M. Mohan Kumar1d769cd2010-09-27 12:22:13 +0530262 glock.start = fl->fl_start;
263 if (fl->fl_end == OFFSET_MAX)
264 glock.length = 0;
265 else
266 glock.length = fl->fl_end - fl->fl_start + 1;
267 glock.proc_id = fl->fl_pid;
Will Deacon50192ab2013-08-21 18:24:47 +0100268 glock.client_id = fid->clnt->name;
M. Mohan Kumar1d769cd2010-09-27 12:22:13 +0530269
270 res = p9_client_getlock_dotl(fid, &glock);
271 if (res < 0)
272 return res;
Jim Garlick51b8b4f2011-08-21 00:21:18 +0530273 /* map 9p lock type to os lock type */
274 switch (glock.type) {
275 case P9_LOCK_TYPE_RDLCK:
276 fl->fl_type = F_RDLCK;
277 break;
278 case P9_LOCK_TYPE_WRLCK:
279 fl->fl_type = F_WRLCK;
280 break;
281 case P9_LOCK_TYPE_UNLCK:
282 fl->fl_type = F_UNLCK;
283 break;
284 }
285 if (glock.type != P9_LOCK_TYPE_UNLCK) {
M. Mohan Kumar1d769cd2010-09-27 12:22:13 +0530286 fl->fl_start = glock.start;
287 if (glock.length == 0)
288 fl->fl_end = OFFSET_MAX;
289 else
290 fl->fl_end = glock.start + glock.length - 1;
291 fl->fl_pid = glock.proc_id;
Jim Garlick51b8b4f2011-08-21 00:21:18 +0530292 }
Al Viroce85dd52015-04-02 12:02:03 -0400293 kfree(glock.client_id);
M. Mohan Kumar1d769cd2010-09-27 12:22:13 +0530294 return res;
295}
296
M. Mohan Kumara0990272010-09-27 11:34:24 +0530297/**
298 * v9fs_file_lock_dotl - lock a file (or directory)
299 * @filp: file to be locked
300 * @cmd: lock command
301 * @fl: file lock structure
302 *
303 */
304
305static int v9fs_file_lock_dotl(struct file *filp, int cmd, struct file_lock *fl)
306{
Al Viro496ad9a2013-01-23 17:07:38 -0500307 struct inode *inode = file_inode(filp);
M. Mohan Kumara0990272010-09-27 11:34:24 +0530308 int ret = -ENOLCK;
309
Al Viro4b8e9922014-08-19 20:17:38 -0400310 p9_debug(P9_DEBUG_VFS, "filp: %p cmd:%d lock: %p name: %pD\n",
311 filp, cmd, fl, filp);
M. Mohan Kumara0990272010-09-27 11:34:24 +0530312
313 /* No mandatory locks */
314 if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK)
315 goto out_err;
316
317 if ((IS_SETLK(cmd) || IS_SETLKW(cmd)) && fl->fl_type != F_UNLCK) {
318 filemap_write_and_wait(inode->i_mapping);
319 invalidate_mapping_pages(&inode->i_data, 0, -1);
320 }
321
322 if (IS_SETLK(cmd) || IS_SETLKW(cmd))
323 ret = v9fs_file_do_lock(filp, cmd, fl);
M. Mohan Kumar1d769cd2010-09-27 12:22:13 +0530324 else if (IS_GETLK(cmd))
325 ret = v9fs_file_getlock(filp, fl);
M. Mohan Kumara0990272010-09-27 11:34:24 +0530326 else
327 ret = -EINVAL;
328out_err:
329 return ret;
330}
331
332/**
333 * v9fs_file_flock_dotl - lock a file
334 * @filp: file to be locked
335 * @cmd: lock command
336 * @fl: file lock structure
337 *
338 */
339
340static int v9fs_file_flock_dotl(struct file *filp, int cmd,
341 struct file_lock *fl)
342{
Al Viro496ad9a2013-01-23 17:07:38 -0500343 struct inode *inode = file_inode(filp);
M. Mohan Kumara0990272010-09-27 11:34:24 +0530344 int ret = -ENOLCK;
345
Al Viro4b8e9922014-08-19 20:17:38 -0400346 p9_debug(P9_DEBUG_VFS, "filp: %p cmd:%d lock: %p name: %pD\n",
347 filp, cmd, fl, filp);
M. Mohan Kumara0990272010-09-27 11:34:24 +0530348
349 /* No mandatory locks */
350 if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK)
351 goto out_err;
352
353 if (!(fl->fl_flags & FL_FLOCK))
354 goto out_err;
355
356 if ((IS_SETLK(cmd) || IS_SETLKW(cmd)) && fl->fl_type != F_UNLCK) {
357 filemap_write_and_wait(inode->i_mapping);
358 invalidate_mapping_pages(&inode->i_data, 0, -1);
359 }
360 /* Convert flock to posix lock */
M. Mohan Kumara0990272010-09-27 11:34:24 +0530361 fl->fl_flags |= FL_POSIX;
362 fl->fl_flags ^= FL_FLOCK;
363
364 if (IS_SETLK(cmd) | IS_SETLKW(cmd))
365 ret = v9fs_file_do_lock(filp, cmd, fl);
366 else
367 ret = -EINVAL;
368out_err:
369 return ret;
370}
371
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700372/**
Eric Van Hensbergenfbedadc2008-10-13 20:36:16 -0500373 * v9fs_file_read - read from a file
374 * @filp: file pointer to read
375 * @udata: user data buffer to read data into
376 * @count: size of buffer
377 * @offset: offset at which to read data
378 *
379 */
380
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700381static ssize_t
Al Viroe494b6b2015-04-01 23:59:57 -0400382v9fs_file_read_iter(struct kiocb *iocb, struct iov_iter *to)
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700383{
Al Viroe494b6b2015-04-01 23:59:57 -0400384 struct p9_fid *fid = iocb->ki_filp->private_data;
Vincent Bernatb5ac1fb22015-08-15 14:07:44 +0200385 int ret, err = 0;
Al Viroe1200fe62015-04-01 23:42:28 -0400386
Al Viroe494b6b2015-04-01 23:59:57 -0400387 p9_debug(P9_DEBUG_VFS, "count %zu offset %lld\n",
388 iov_iter_count(to), iocb->ki_pos);
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700389
Al Viroe494b6b2015-04-01 23:59:57 -0400390 ret = p9_client_read(fid, iocb->ki_pos, to, &err);
Al Viroe1200fe62015-04-01 23:42:28 -0400391 if (!ret)
392 return err;
Eric Van Hensbergenfbedadc2008-10-13 20:36:16 -0500393
Al Viroe494b6b2015-04-01 23:59:57 -0400394 iocb->ki_pos += ret;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500395 return ret;
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700396}
397
398/**
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700399 * v9fs_file_write - write to a file
Eric Van Hensbergenee443992008-03-05 07:08:09 -0600400 * @filp: file pointer to write
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700401 * @data: data buffer to write data from
402 * @count: size of buffer
403 * @offset: offset at which to write data
404 *
405 */
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700406static ssize_t
Al Viroe494b6b2015-04-01 23:59:57 -0400407v9fs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700408{
Al Viroe494b6b2015-04-01 23:59:57 -0400409 struct file *file = iocb->ki_filp;
Al Viro3309dd02015-04-09 12:55:47 -0400410 ssize_t retval;
411 loff_t origin;
Al Viroc711a6b2015-04-01 22:04:46 -0400412 int err = 0;
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700413
Al Viro3309dd02015-04-09 12:55:47 -0400414 retval = generic_write_checks(iocb, from);
415 if (retval <= 0)
Al Viroc711a6b2015-04-01 22:04:46 -0400416 return retval;
Harsh Prateek Bora3834b122010-08-03 11:55:40 +0000417
Al Viro3309dd02015-04-09 12:55:47 -0400418 origin = iocb->ki_pos;
419 retval = p9_client_write(file->private_data, iocb->ki_pos, from, &err);
Al Viroc711a6b2015-04-01 22:04:46 -0400420 if (retval > 0) {
Al Viroe494b6b2015-04-01 23:59:57 -0400421 struct inode *inode = file_inode(file);
Al Viroc711a6b2015-04-01 22:04:46 -0400422 loff_t i_size;
423 unsigned long pg_start, pg_end;
Kirill A. Shutemov09cbfea2016-04-01 15:29:47 +0300424 pg_start = origin >> PAGE_SHIFT;
425 pg_end = (origin + retval - 1) >> PAGE_SHIFT;
Al Viroc711a6b2015-04-01 22:04:46 -0400426 if (inode->i_mapping && inode->i_mapping->nrpages)
427 invalidate_inode_pages2_range(inode->i_mapping,
428 pg_start, pg_end);
Al Viro3309dd02015-04-09 12:55:47 -0400429 iocb->ki_pos += retval;
Al Viroc711a6b2015-04-01 22:04:46 -0400430 i_size = i_size_read(inode);
Al Viro3309dd02015-04-09 12:55:47 -0400431 if (iocb->ki_pos > i_size) {
432 inode_add_bytes(inode, iocb->ki_pos - i_size);
433 i_size_write(inode, iocb->ki_pos);
Al Viroc711a6b2015-04-01 22:04:46 -0400434 }
435 return retval;
436 }
437 return err;
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700438}
439
Josef Bacik02c24a82011-07-16 20:44:56 -0400440static int v9fs_file_fsync(struct file *filp, loff_t start, loff_t end,
441 int datasync)
M. Mohan Kumar7a4439c2010-02-08 15:36:48 -0600442{
443 struct p9_fid *fid;
Josef Bacik02c24a82011-07-16 20:44:56 -0400444 struct inode *inode = filp->f_mapping->host;
M. Mohan Kumar7a4439c2010-02-08 15:36:48 -0600445 struct p9_wstat wstat;
446 int retval;
447
Josef Bacik02c24a82011-07-16 20:44:56 -0400448 retval = filemap_write_and_wait_range(inode->i_mapping, start, end);
449 if (retval)
450 return retval;
451
Al Viro59551022016-01-22 15:40:57 -0500452 inode_lock(inode);
Joe Perches5d385152011-11-28 10:40:46 -0800453 p9_debug(P9_DEBUG_VFS, "filp %p datasync %x\n", filp, datasync);
M. Mohan Kumar7a4439c2010-02-08 15:36:48 -0600454
455 fid = filp->private_data;
456 v9fs_blank_wstat(&wstat);
457
458 retval = p9_client_wstat(fid, &wstat);
Al Viro59551022016-01-22 15:40:57 -0500459 inode_unlock(inode);
Josef Bacik02c24a82011-07-16 20:44:56 -0400460
M. Mohan Kumar7a4439c2010-02-08 15:36:48 -0600461 return retval;
462}
463
Josef Bacik02c24a82011-07-16 20:44:56 -0400464int v9fs_file_fsync_dotl(struct file *filp, loff_t start, loff_t end,
465 int datasync)
Venkateswararao Jujjuri (JV)920e65d2010-09-22 17:19:19 -0700466{
467 struct p9_fid *fid;
Josef Bacik02c24a82011-07-16 20:44:56 -0400468 struct inode *inode = filp->f_mapping->host;
Venkateswararao Jujjuri (JV)920e65d2010-09-22 17:19:19 -0700469 int retval;
470
Josef Bacik02c24a82011-07-16 20:44:56 -0400471 retval = filemap_write_and_wait_range(inode->i_mapping, start, end);
472 if (retval)
473 return retval;
474
Al Viro59551022016-01-22 15:40:57 -0500475 inode_lock(inode);
Joe Perches5d385152011-11-28 10:40:46 -0800476 p9_debug(P9_DEBUG_VFS, "filp %p datasync %x\n", filp, datasync);
Venkateswararao Jujjuri (JV)920e65d2010-09-22 17:19:19 -0700477
478 fid = filp->private_data;
479
Venkateswararao Jujjuri (JV)b165d602010-10-22 10:13:12 -0700480 retval = p9_client_fsync(fid, datasync);
Al Viro59551022016-01-22 15:40:57 -0500481 inode_unlock(inode);
Josef Bacik02c24a82011-07-16 20:44:56 -0400482
Venkateswararao Jujjuri (JV)920e65d2010-09-22 17:19:19 -0700483 return retval;
484}
485
Aneesh Kumar K.V7263ceb2011-02-28 17:03:58 +0530486static int
Dominique Martinetfb89b452014-01-10 13:44:09 +0100487v9fs_file_mmap(struct file *filp, struct vm_area_struct *vma)
Aneesh Kumar K.V7263ceb2011-02-28 17:03:58 +0530488{
489 int retval;
490
Dominique Martinetfb89b452014-01-10 13:44:09 +0100491
492 retval = generic_file_mmap(filp, vma);
Aneesh Kumar K.V7263ceb2011-02-28 17:03:58 +0530493 if (!retval)
494 vma->vm_ops = &v9fs_file_vm_ops;
495
496 return retval;
497}
498
499static int
Dominique Martinetfb89b452014-01-10 13:44:09 +0100500v9fs_mmap_file_mmap(struct file *filp, struct vm_area_struct *vma)
501{
502 int retval;
503 struct inode *inode;
504 struct v9fs_inode *v9inode;
505 struct p9_fid *fid;
506
507 inode = file_inode(filp);
508 v9inode = V9FS_I(inode);
509 mutex_lock(&v9inode->v_mutex);
510 if (!v9inode->writeback_fid &&
511 (vma->vm_flags & VM_WRITE)) {
512 /*
513 * clone a fid and add it to writeback_fid
514 * we do it during mmap instead of
515 * page dirty time via write_begin/page_mkwrite
516 * because we want write after unlink usecase
517 * to work.
518 */
Miklos Szeredib403f0e2016-06-29 10:54:23 +0200519 fid = v9fs_writeback_fid(file_dentry(filp));
Dominique Martinetfb89b452014-01-10 13:44:09 +0100520 if (IS_ERR(fid)) {
521 retval = PTR_ERR(fid);
522 mutex_unlock(&v9inode->v_mutex);
523 return retval;
524 }
525 v9inode->writeback_fid = (void *) fid;
526 }
527 mutex_unlock(&v9inode->v_mutex);
528
529 retval = generic_file_mmap(filp, vma);
530 if (!retval)
531 vma->vm_ops = &v9fs_mmap_file_vm_ops;
532
533 return retval;
534}
535
536static int
Dave Jiang11bac802017-02-24 14:56:41 -0800537v9fs_vm_page_mkwrite(struct vm_fault *vmf)
Aneesh Kumar K.V7263ceb2011-02-28 17:03:58 +0530538{
Aneesh Kumar K.V6b39f6d2011-02-28 17:04:03 +0530539 struct v9fs_inode *v9inode;
Aneesh Kumar K.V7263ceb2011-02-28 17:03:58 +0530540 struct page *page = vmf->page;
Dave Jiang11bac802017-02-24 14:56:41 -0800541 struct file *filp = vmf->vma->vm_file;
Al Viro496ad9a2013-01-23 17:07:38 -0500542 struct inode *inode = file_inode(filp);
Aneesh Kumar K.V7263ceb2011-02-28 17:03:58 +0530543
544
Joe Perches5d385152011-11-28 10:40:46 -0800545 p9_debug(P9_DEBUG_VFS, "page %p fid %lx\n",
546 page, (unsigned long)filp->private_data);
Aneesh Kumar K.V7263ceb2011-02-28 17:03:58 +0530547
Jan Kara120c2bc2012-06-12 16:20:25 +0200548 /* Update file times before taking page lock */
549 file_update_time(filp);
550
Aneesh Kumar K.V6b39f6d2011-02-28 17:04:03 +0530551 v9inode = V9FS_I(inode);
Aneesh Kumar K.V7263ceb2011-02-28 17:03:58 +0530552 /* make sure the cache has finished storing the page */
553 v9fs_fscache_wait_on_page_write(inode, page);
Aneesh Kumar K.V6b39f6d2011-02-28 17:04:03 +0530554 BUG_ON(!v9inode->writeback_fid);
Aneesh Kumar K.V7263ceb2011-02-28 17:03:58 +0530555 lock_page(page);
556 if (page->mapping != inode->i_mapping)
557 goto out_unlock;
Darrick J. Wong13575ca2013-02-21 16:42:53 -0800558 wait_for_stable_page(page);
Aneesh Kumar K.V7263ceb2011-02-28 17:03:58 +0530559
560 return VM_FAULT_LOCKED;
561out_unlock:
562 unlock_page(page);
563 return VM_FAULT_NOPAGE;
564}
565
Dominique Martinetfb89b452014-01-10 13:44:09 +0100566/**
567 * v9fs_mmap_file_read - read from a file
568 * @filp: file pointer to read
Fabian Frederickfd2916b2014-06-04 16:06:26 -0700569 * @data: user data buffer to read data into
Dominique Martinetfb89b452014-01-10 13:44:09 +0100570 * @count: size of buffer
571 * @offset: offset at which to read data
572 *
573 */
574static ssize_t
Al Viroe494b6b2015-04-01 23:59:57 -0400575v9fs_mmap_file_read_iter(struct kiocb *iocb, struct iov_iter *to)
Dominique Martinetfb89b452014-01-10 13:44:09 +0100576{
577 /* TODO: Check if there are dirty pages */
Al Viroe494b6b2015-04-01 23:59:57 -0400578 return v9fs_file_read_iter(iocb, to);
Dominique Martinetfb89b452014-01-10 13:44:09 +0100579}
580
Dominique Martinetfb89b452014-01-10 13:44:09 +0100581/**
582 * v9fs_mmap_file_write - write to a file
583 * @filp: file pointer to write
584 * @data: data buffer to write data from
585 * @count: size of buffer
586 * @offset: offset at which to write data
587 *
588 */
589static ssize_t
Al Viroe494b6b2015-04-01 23:59:57 -0400590v9fs_mmap_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
Dominique Martinetfb89b452014-01-10 13:44:09 +0100591{
592 /*
593 * TODO: invalidate mmaps on filp's inode between
594 * offset and offset+count
595 */
Al Viroe494b6b2015-04-01 23:59:57 -0400596 return v9fs_file_write_iter(iocb, from);
Dominique Martinetfb89b452014-01-10 13:44:09 +0100597}
598
599static void v9fs_mmap_vm_close(struct vm_area_struct *vma)
600{
601 struct inode *inode;
602
603 struct writeback_control wbc = {
604 .nr_to_write = LONG_MAX,
605 .sync_mode = WB_SYNC_ALL,
606 .range_start = vma->vm_pgoff * PAGE_SIZE,
607 /* absolute end, byte at end included */
608 .range_end = vma->vm_pgoff * PAGE_SIZE +
609 (vma->vm_end - vma->vm_start - 1),
610 };
611
612
613 p9_debug(P9_DEBUG_VFS, "9p VMA close, %p, flushing", vma);
614
615 inode = file_inode(vma->vm_file);
616
617 if (!mapping_cap_writeback_dirty(inode->i_mapping))
618 wbc.nr_to_write = 0;
619
620 might_sleep();
621 sync_inode(inode, &wbc);
622}
623
624
Aneesh Kumar K.V7263ceb2011-02-28 17:03:58 +0530625static const struct vm_operations_struct v9fs_file_vm_ops = {
626 .fault = filemap_fault,
Kirill A. Shutemovf1820362014-04-07 15:37:19 -0700627 .map_pages = filemap_map_pages,
Aneesh Kumar K.V7263ceb2011-02-28 17:03:58 +0530628 .page_mkwrite = v9fs_vm_page_mkwrite,
629};
630
Dominique Martinetfb89b452014-01-10 13:44:09 +0100631static const struct vm_operations_struct v9fs_mmap_file_vm_ops = {
632 .close = v9fs_mmap_vm_close,
633 .fault = filemap_fault,
Kirill A. Shutemovf1820362014-04-07 15:37:19 -0700634 .map_pages = filemap_map_pages,
Dominique Martinetfb89b452014-01-10 13:44:09 +0100635 .page_mkwrite = v9fs_vm_page_mkwrite,
Dominique Martinetfb89b452014-01-10 13:44:09 +0100636};
637
Aneesh Kumar K.Ve959b542011-02-28 17:04:04 +0530638
Aneesh Kumar K.V29236f42011-02-28 17:03:54 +0530639const struct file_operations v9fs_cached_file_operations = {
Eric Van Hensbergene03abc02007-02-11 13:21:39 -0600640 .llseek = generic_file_llseek,
Al Viroaad4f8b2014-04-02 14:33:16 -0400641 .read_iter = generic_file_read_iter,
Al Viro81742022014-04-03 03:17:43 -0400642 .write_iter = generic_file_write_iter,
Eric Van Hensbergene03abc02007-02-11 13:21:39 -0600643 .open = v9fs_file_open,
644 .release = v9fs_dir_release,
645 .lock = v9fs_file_lock,
Aneesh Kumar K.V7263ceb2011-02-28 17:03:58 +0530646 .mmap = v9fs_file_mmap,
M. Mohan Kumar7a4439c2010-02-08 15:36:48 -0600647 .fsync = v9fs_file_fsync,
Eric Van Hensbergene03abc02007-02-11 13:21:39 -0600648};
649
Aneesh Kumar K.V29236f42011-02-28 17:03:54 +0530650const struct file_operations v9fs_cached_file_operations_dotl = {
Venkateswararao Jujjuri (JV)b04faaf2010-09-22 16:30:52 -0700651 .llseek = generic_file_llseek,
Al Viroaad4f8b2014-04-02 14:33:16 -0400652 .read_iter = generic_file_read_iter,
Al Viro81742022014-04-03 03:17:43 -0400653 .write_iter = generic_file_write_iter,
Venkateswararao Jujjuri (JV)b04faaf2010-09-22 16:30:52 -0700654 .open = v9fs_file_open,
655 .release = v9fs_dir_release,
M. Mohan Kumara0990272010-09-27 11:34:24 +0530656 .lock = v9fs_file_lock_dotl,
657 .flock = v9fs_file_flock_dotl,
Aneesh Kumar K.V7263ceb2011-02-28 17:03:58 +0530658 .mmap = v9fs_file_mmap,
Venkateswararao Jujjuri (JV)920e65d2010-09-22 17:19:19 -0700659 .fsync = v9fs_file_fsync_dotl,
Venkateswararao Jujjuri (JV)b04faaf2010-09-22 16:30:52 -0700660};
661
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -0800662const struct file_operations v9fs_file_operations = {
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700663 .llseek = generic_file_llseek,
Al Viroe494b6b2015-04-01 23:59:57 -0400664 .read_iter = v9fs_file_read_iter,
665 .write_iter = v9fs_file_write_iter,
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700666 .open = v9fs_file_open,
667 .release = v9fs_dir_release,
668 .lock = v9fs_file_lock,
Eric Van Hensbergen14b88692008-02-06 19:25:05 -0600669 .mmap = generic_file_readonly_mmap,
M. Mohan Kumar7a4439c2010-02-08 15:36:48 -0600670 .fsync = v9fs_file_fsync,
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700671};
Sripathi Kodi9b6533c2010-03-25 12:41:54 +0000672
673const struct file_operations v9fs_file_operations_dotl = {
674 .llseek = generic_file_llseek,
Al Viroe494b6b2015-04-01 23:59:57 -0400675 .read_iter = v9fs_file_read_iter,
676 .write_iter = v9fs_file_write_iter,
Sripathi Kodi9b6533c2010-03-25 12:41:54 +0000677 .open = v9fs_file_open,
678 .release = v9fs_dir_release,
M. Mohan Kumara0990272010-09-27 11:34:24 +0530679 .lock = v9fs_file_lock_dotl,
680 .flock = v9fs_file_flock_dotl,
Sripathi Kodi9b6533c2010-03-25 12:41:54 +0000681 .mmap = generic_file_readonly_mmap,
Venkateswararao Jujjuri (JV)920e65d2010-09-22 17:19:19 -0700682 .fsync = v9fs_file_fsync_dotl,
Sripathi Kodi9b6533c2010-03-25 12:41:54 +0000683};
Dominique Martinetfb89b452014-01-10 13:44:09 +0100684
685const struct file_operations v9fs_mmap_file_operations = {
686 .llseek = generic_file_llseek,
Al Viroe494b6b2015-04-01 23:59:57 -0400687 .read_iter = v9fs_mmap_file_read_iter,
688 .write_iter = v9fs_mmap_file_write_iter,
Dominique Martinetfb89b452014-01-10 13:44:09 +0100689 .open = v9fs_file_open,
690 .release = v9fs_dir_release,
691 .lock = v9fs_file_lock,
692 .mmap = v9fs_mmap_file_mmap,
693 .fsync = v9fs_file_fsync,
694};
695
696const struct file_operations v9fs_mmap_file_operations_dotl = {
697 .llseek = generic_file_llseek,
Al Viroe494b6b2015-04-01 23:59:57 -0400698 .read_iter = v9fs_mmap_file_read_iter,
699 .write_iter = v9fs_mmap_file_write_iter,
Dominique Martinetfb89b452014-01-10 13:44:09 +0100700 .open = v9fs_file_open,
701 .release = v9fs_dir_release,
702 .lock = v9fs_file_lock_dotl,
703 .flock = v9fs_file_flock_dotl,
704 .mmap = v9fs_mmap_file_mmap,
705 .fsync = v9fs_file_fsync_dotl,
706};