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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>
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) {
77 fid = v9fs_fid_clone(file->f_path.dentry);
78 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 */
103 fid = v9fs_writeback_fid(file->f_path.dentry);
104 if (IS_ERR(fid)) {
105 err = PTR_ERR(fid);
Aneesh Kumar K.V5a7e0a82011-03-08 16:39:46 +0530106 mutex_unlock(&v9inode->v_mutex);
Aneesh Kumar K.V3cf387d2011-02-28 17:03:57 +0530107 goto out_error;
108 }
Aneesh Kumar K.V6b39f6d2011-02-28 17:04:03 +0530109 v9inode->writeback_fid = (void *) fid;
Aneesh Kumar K.V3cf387d2011-02-28 17:03:57 +0530110 }
Aneesh Kumar K.V5a7e0a82011-03-08 16:39:46 +0530111 mutex_unlock(&v9inode->v_mutex);
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
164 res = posix_lock_file_wait(filp, fl);
165 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;
234 res = posix_lock_file_wait(filp, fl);
235 fl->fl_type = fl_type;
236 }
237out:
238 return res;
239}
240
M. Mohan Kumar1d769cd2010-09-27 12:22:13 +0530241static int v9fs_file_getlock(struct file *filp, struct file_lock *fl)
242{
243 struct p9_getlock glock;
244 struct p9_fid *fid;
245 int res = 0;
246
247 fid = filp->private_data;
248 BUG_ON(fid == NULL);
249
250 posix_test_lock(filp, fl);
251 /*
252 * if we have a conflicting lock locally, no need to validate
253 * with server
254 */
255 if (fl->fl_type != F_UNLCK)
256 return res;
257
258 /* convert posix lock to p9 tgetlock args */
259 memset(&glock, 0, sizeof(glock));
Jim Garlick51b8b4f2011-08-21 00:21:18 +0530260 glock.type = P9_LOCK_TYPE_UNLCK;
M. Mohan Kumar1d769cd2010-09-27 12:22:13 +0530261 glock.start = fl->fl_start;
262 if (fl->fl_end == OFFSET_MAX)
263 glock.length = 0;
264 else
265 glock.length = fl->fl_end - fl->fl_start + 1;
266 glock.proc_id = fl->fl_pid;
Will Deacon50192ab2013-08-21 18:24:47 +0100267 glock.client_id = fid->clnt->name;
M. Mohan Kumar1d769cd2010-09-27 12:22:13 +0530268
269 res = p9_client_getlock_dotl(fid, &glock);
270 if (res < 0)
271 return res;
Jim Garlick51b8b4f2011-08-21 00:21:18 +0530272 /* map 9p lock type to os lock type */
273 switch (glock.type) {
274 case P9_LOCK_TYPE_RDLCK:
275 fl->fl_type = F_RDLCK;
276 break;
277 case P9_LOCK_TYPE_WRLCK:
278 fl->fl_type = F_WRLCK;
279 break;
280 case P9_LOCK_TYPE_UNLCK:
281 fl->fl_type = F_UNLCK;
282 break;
283 }
284 if (glock.type != P9_LOCK_TYPE_UNLCK) {
M. Mohan Kumar1d769cd2010-09-27 12:22:13 +0530285 fl->fl_start = glock.start;
286 if (glock.length == 0)
287 fl->fl_end = OFFSET_MAX;
288 else
289 fl->fl_end = glock.start + glock.length - 1;
290 fl->fl_pid = glock.proc_id;
Jim Garlick51b8b4f2011-08-21 00:21:18 +0530291 }
Al Viroce85dd52015-04-02 12:02:03 -0400292 kfree(glock.client_id);
M. Mohan Kumar1d769cd2010-09-27 12:22:13 +0530293 return res;
294}
295
M. Mohan Kumara0990272010-09-27 11:34:24 +0530296/**
297 * v9fs_file_lock_dotl - lock a file (or directory)
298 * @filp: file to be locked
299 * @cmd: lock command
300 * @fl: file lock structure
301 *
302 */
303
304static int v9fs_file_lock_dotl(struct file *filp, int cmd, struct file_lock *fl)
305{
Al Viro496ad9a2013-01-23 17:07:38 -0500306 struct inode *inode = file_inode(filp);
M. Mohan Kumara0990272010-09-27 11:34:24 +0530307 int ret = -ENOLCK;
308
Al Viro4b8e9922014-08-19 20:17:38 -0400309 p9_debug(P9_DEBUG_VFS, "filp: %p cmd:%d lock: %p name: %pD\n",
310 filp, cmd, fl, filp);
M. Mohan Kumara0990272010-09-27 11:34:24 +0530311
312 /* No mandatory locks */
313 if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK)
314 goto out_err;
315
316 if ((IS_SETLK(cmd) || IS_SETLKW(cmd)) && fl->fl_type != F_UNLCK) {
317 filemap_write_and_wait(inode->i_mapping);
318 invalidate_mapping_pages(&inode->i_data, 0, -1);
319 }
320
321 if (IS_SETLK(cmd) || IS_SETLKW(cmd))
322 ret = v9fs_file_do_lock(filp, cmd, fl);
M. Mohan Kumar1d769cd2010-09-27 12:22:13 +0530323 else if (IS_GETLK(cmd))
324 ret = v9fs_file_getlock(filp, fl);
M. Mohan Kumara0990272010-09-27 11:34:24 +0530325 else
326 ret = -EINVAL;
327out_err:
328 return ret;
329}
330
331/**
332 * v9fs_file_flock_dotl - lock a file
333 * @filp: file to be locked
334 * @cmd: lock command
335 * @fl: file lock structure
336 *
337 */
338
339static int v9fs_file_flock_dotl(struct file *filp, int cmd,
340 struct file_lock *fl)
341{
Al Viro496ad9a2013-01-23 17:07:38 -0500342 struct inode *inode = file_inode(filp);
M. Mohan Kumara0990272010-09-27 11:34:24 +0530343 int ret = -ENOLCK;
344
Al Viro4b8e9922014-08-19 20:17:38 -0400345 p9_debug(P9_DEBUG_VFS, "filp: %p cmd:%d lock: %p name: %pD\n",
346 filp, cmd, fl, filp);
M. Mohan Kumara0990272010-09-27 11:34:24 +0530347
348 /* No mandatory locks */
349 if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK)
350 goto out_err;
351
352 if (!(fl->fl_flags & FL_FLOCK))
353 goto out_err;
354
355 if ((IS_SETLK(cmd) || IS_SETLKW(cmd)) && fl->fl_type != F_UNLCK) {
356 filemap_write_and_wait(inode->i_mapping);
357 invalidate_mapping_pages(&inode->i_data, 0, -1);
358 }
359 /* Convert flock to posix lock */
M. Mohan Kumara0990272010-09-27 11:34:24 +0530360 fl->fl_flags |= FL_POSIX;
361 fl->fl_flags ^= FL_FLOCK;
362
363 if (IS_SETLK(cmd) | IS_SETLKW(cmd))
364 ret = v9fs_file_do_lock(filp, cmd, fl);
365 else
366 ret = -EINVAL;
367out_err:
368 return ret;
369}
370
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700371/**
Eric Van Hensbergenfbedadc2008-10-13 20:36:16 -0500372 * v9fs_file_read - read from a file
373 * @filp: file pointer to read
374 * @udata: user data buffer to read data into
375 * @count: size of buffer
376 * @offset: offset at which to read data
377 *
378 */
379
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700380static ssize_t
Al Viroe494b6b2015-04-01 23:59:57 -0400381v9fs_file_read_iter(struct kiocb *iocb, struct iov_iter *to)
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700382{
Al Viroe494b6b2015-04-01 23:59:57 -0400383 struct p9_fid *fid = iocb->ki_filp->private_data;
Al Viroe1200fe62015-04-01 23:42:28 -0400384 int ret, err;
385
Al Viroe494b6b2015-04-01 23:59:57 -0400386 p9_debug(P9_DEBUG_VFS, "count %zu offset %lld\n",
387 iov_iter_count(to), iocb->ki_pos);
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700388
Al Viroe494b6b2015-04-01 23:59:57 -0400389 ret = p9_client_read(fid, iocb->ki_pos, to, &err);
Al Viroe1200fe62015-04-01 23:42:28 -0400390 if (!ret)
391 return err;
Eric Van Hensbergenfbedadc2008-10-13 20:36:16 -0500392
Al Viroe494b6b2015-04-01 23:59:57 -0400393 iocb->ki_pos += ret;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500394 return ret;
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700395}
396
397/**
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700398 * v9fs_file_write - write to a file
Eric Van Hensbergenee443992008-03-05 07:08:09 -0600399 * @filp: file pointer to write
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700400 * @data: data buffer to write data from
401 * @count: size of buffer
402 * @offset: offset at which to write data
403 *
404 */
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700405static ssize_t
Al Viroe494b6b2015-04-01 23:59:57 -0400406v9fs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700407{
Al Viroe494b6b2015-04-01 23:59:57 -0400408 struct file *file = iocb->ki_filp;
Al Viro3309dd02015-04-09 12:55:47 -0400409 ssize_t retval;
410 loff_t origin;
Al Viroc711a6b2015-04-01 22:04:46 -0400411 int err = 0;
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700412
Al Viro3309dd02015-04-09 12:55:47 -0400413 retval = generic_write_checks(iocb, from);
414 if (retval <= 0)
Al Viroc711a6b2015-04-01 22:04:46 -0400415 return retval;
Harsh Prateek Bora3834b122010-08-03 11:55:40 +0000416
Al Viro3309dd02015-04-09 12:55:47 -0400417 origin = iocb->ki_pos;
418 retval = p9_client_write(file->private_data, iocb->ki_pos, from, &err);
Al Viroc711a6b2015-04-01 22:04:46 -0400419 if (retval > 0) {
Al Viroe494b6b2015-04-01 23:59:57 -0400420 struct inode *inode = file_inode(file);
Al Viroc711a6b2015-04-01 22:04:46 -0400421 loff_t i_size;
422 unsigned long pg_start, pg_end;
423 pg_start = origin >> PAGE_CACHE_SHIFT;
424 pg_end = (origin + retval - 1) >> PAGE_CACHE_SHIFT;
425 if (inode->i_mapping && inode->i_mapping->nrpages)
426 invalidate_inode_pages2_range(inode->i_mapping,
427 pg_start, pg_end);
Al Viro3309dd02015-04-09 12:55:47 -0400428 iocb->ki_pos += retval;
Al Viroc711a6b2015-04-01 22:04:46 -0400429 i_size = i_size_read(inode);
Al Viro3309dd02015-04-09 12:55:47 -0400430 if (iocb->ki_pos > i_size) {
431 inode_add_bytes(inode, iocb->ki_pos - i_size);
432 i_size_write(inode, iocb->ki_pos);
Al Viroc711a6b2015-04-01 22:04:46 -0400433 }
434 return retval;
435 }
436 return err;
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700437}
438
Josef Bacik02c24a82011-07-16 20:44:56 -0400439static int v9fs_file_fsync(struct file *filp, loff_t start, loff_t end,
440 int datasync)
M. Mohan Kumar7a4439c2010-02-08 15:36:48 -0600441{
442 struct p9_fid *fid;
Josef Bacik02c24a82011-07-16 20:44:56 -0400443 struct inode *inode = filp->f_mapping->host;
M. Mohan Kumar7a4439c2010-02-08 15:36:48 -0600444 struct p9_wstat wstat;
445 int retval;
446
Josef Bacik02c24a82011-07-16 20:44:56 -0400447 retval = filemap_write_and_wait_range(inode->i_mapping, start, end);
448 if (retval)
449 return retval;
450
451 mutex_lock(&inode->i_mutex);
Joe Perches5d385152011-11-28 10:40:46 -0800452 p9_debug(P9_DEBUG_VFS, "filp %p datasync %x\n", filp, datasync);
M. Mohan Kumar7a4439c2010-02-08 15:36:48 -0600453
454 fid = filp->private_data;
455 v9fs_blank_wstat(&wstat);
456
457 retval = p9_client_wstat(fid, &wstat);
Josef Bacik02c24a82011-07-16 20:44:56 -0400458 mutex_unlock(&inode->i_mutex);
459
M. Mohan Kumar7a4439c2010-02-08 15:36:48 -0600460 return retval;
461}
462
Josef Bacik02c24a82011-07-16 20:44:56 -0400463int v9fs_file_fsync_dotl(struct file *filp, loff_t start, loff_t end,
464 int datasync)
Venkateswararao Jujjuri (JV)920e65d2010-09-22 17:19:19 -0700465{
466 struct p9_fid *fid;
Josef Bacik02c24a82011-07-16 20:44:56 -0400467 struct inode *inode = filp->f_mapping->host;
Venkateswararao Jujjuri (JV)920e65d2010-09-22 17:19:19 -0700468 int retval;
469
Josef Bacik02c24a82011-07-16 20:44:56 -0400470 retval = filemap_write_and_wait_range(inode->i_mapping, start, end);
471 if (retval)
472 return retval;
473
474 mutex_lock(&inode->i_mutex);
Joe Perches5d385152011-11-28 10:40:46 -0800475 p9_debug(P9_DEBUG_VFS, "filp %p datasync %x\n", filp, datasync);
Venkateswararao Jujjuri (JV)920e65d2010-09-22 17:19:19 -0700476
477 fid = filp->private_data;
478
Venkateswararao Jujjuri (JV)b165d602010-10-22 10:13:12 -0700479 retval = p9_client_fsync(fid, datasync);
Josef Bacik02c24a82011-07-16 20:44:56 -0400480 mutex_unlock(&inode->i_mutex);
481
Venkateswararao Jujjuri (JV)920e65d2010-09-22 17:19:19 -0700482 return retval;
483}
484
Aneesh Kumar K.V7263ceb2011-02-28 17:03:58 +0530485static int
Dominique Martinetfb89b452014-01-10 13:44:09 +0100486v9fs_file_mmap(struct file *filp, struct vm_area_struct *vma)
Aneesh Kumar K.V7263ceb2011-02-28 17:03:58 +0530487{
488 int retval;
489
Dominique Martinetfb89b452014-01-10 13:44:09 +0100490
491 retval = generic_file_mmap(filp, vma);
Aneesh Kumar K.V7263ceb2011-02-28 17:03:58 +0530492 if (!retval)
493 vma->vm_ops = &v9fs_file_vm_ops;
494
495 return retval;
496}
497
498static int
Dominique Martinetfb89b452014-01-10 13:44:09 +0100499v9fs_mmap_file_mmap(struct file *filp, struct vm_area_struct *vma)
500{
501 int retval;
502 struct inode *inode;
503 struct v9fs_inode *v9inode;
504 struct p9_fid *fid;
505
506 inode = file_inode(filp);
507 v9inode = V9FS_I(inode);
508 mutex_lock(&v9inode->v_mutex);
509 if (!v9inode->writeback_fid &&
510 (vma->vm_flags & VM_WRITE)) {
511 /*
512 * clone a fid and add it to writeback_fid
513 * we do it during mmap instead of
514 * page dirty time via write_begin/page_mkwrite
515 * because we want write after unlink usecase
516 * to work.
517 */
518 fid = v9fs_writeback_fid(filp->f_path.dentry);
519 if (IS_ERR(fid)) {
520 retval = PTR_ERR(fid);
521 mutex_unlock(&v9inode->v_mutex);
522 return retval;
523 }
524 v9inode->writeback_fid = (void *) fid;
525 }
526 mutex_unlock(&v9inode->v_mutex);
527
528 retval = generic_file_mmap(filp, vma);
529 if (!retval)
530 vma->vm_ops = &v9fs_mmap_file_vm_ops;
531
532 return retval;
533}
534
535static int
Aneesh Kumar K.V7263ceb2011-02-28 17:03:58 +0530536v9fs_vm_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
537{
Aneesh Kumar K.V6b39f6d2011-02-28 17:04:03 +0530538 struct v9fs_inode *v9inode;
Aneesh Kumar K.V7263ceb2011-02-28 17:03:58 +0530539 struct page *page = vmf->page;
540 struct file *filp = vma->vm_file;
Al Viro496ad9a2013-01-23 17:07:38 -0500541 struct inode *inode = file_inode(filp);
Aneesh Kumar K.V7263ceb2011-02-28 17:03:58 +0530542
543
Joe Perches5d385152011-11-28 10:40:46 -0800544 p9_debug(P9_DEBUG_VFS, "page %p fid %lx\n",
545 page, (unsigned long)filp->private_data);
Aneesh Kumar K.V7263ceb2011-02-28 17:03:58 +0530546
Jan Kara120c2bc2012-06-12 16:20:25 +0200547 /* Update file times before taking page lock */
548 file_update_time(filp);
549
Aneesh Kumar K.V6b39f6d2011-02-28 17:04:03 +0530550 v9inode = V9FS_I(inode);
Aneesh Kumar K.V7263ceb2011-02-28 17:03:58 +0530551 /* make sure the cache has finished storing the page */
552 v9fs_fscache_wait_on_page_write(inode, page);
Aneesh Kumar K.V6b39f6d2011-02-28 17:04:03 +0530553 BUG_ON(!v9inode->writeback_fid);
Aneesh Kumar K.V7263ceb2011-02-28 17:03:58 +0530554 lock_page(page);
555 if (page->mapping != inode->i_mapping)
556 goto out_unlock;
Darrick J. Wong13575ca2013-02-21 16:42:53 -0800557 wait_for_stable_page(page);
Aneesh Kumar K.V7263ceb2011-02-28 17:03:58 +0530558
559 return VM_FAULT_LOCKED;
560out_unlock:
561 unlock_page(page);
562 return VM_FAULT_NOPAGE;
563}
564
Dominique Martinetfb89b452014-01-10 13:44:09 +0100565/**
566 * v9fs_mmap_file_read - read from a file
567 * @filp: file pointer to read
Fabian Frederickfd2916b2014-06-04 16:06:26 -0700568 * @data: user data buffer to read data into
Dominique Martinetfb89b452014-01-10 13:44:09 +0100569 * @count: size of buffer
570 * @offset: offset at which to read data
571 *
572 */
573static ssize_t
Al Viroe494b6b2015-04-01 23:59:57 -0400574v9fs_mmap_file_read_iter(struct kiocb *iocb, struct iov_iter *to)
Dominique Martinetfb89b452014-01-10 13:44:09 +0100575{
576 /* TODO: Check if there are dirty pages */
Al Viroe494b6b2015-04-01 23:59:57 -0400577 return v9fs_file_read_iter(iocb, to);
Dominique Martinetfb89b452014-01-10 13:44:09 +0100578}
579
Dominique Martinetfb89b452014-01-10 13:44:09 +0100580/**
581 * v9fs_mmap_file_write - write to a file
582 * @filp: file pointer to write
583 * @data: data buffer to write data from
584 * @count: size of buffer
585 * @offset: offset at which to write data
586 *
587 */
588static ssize_t
Al Viroe494b6b2015-04-01 23:59:57 -0400589v9fs_mmap_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
Dominique Martinetfb89b452014-01-10 13:44:09 +0100590{
591 /*
592 * TODO: invalidate mmaps on filp's inode between
593 * offset and offset+count
594 */
Al Viroe494b6b2015-04-01 23:59:57 -0400595 return v9fs_file_write_iter(iocb, from);
Dominique Martinetfb89b452014-01-10 13:44:09 +0100596}
597
598static void v9fs_mmap_vm_close(struct vm_area_struct *vma)
599{
600 struct inode *inode;
601
602 struct writeback_control wbc = {
603 .nr_to_write = LONG_MAX,
604 .sync_mode = WB_SYNC_ALL,
605 .range_start = vma->vm_pgoff * PAGE_SIZE,
606 /* absolute end, byte at end included */
607 .range_end = vma->vm_pgoff * PAGE_SIZE +
608 (vma->vm_end - vma->vm_start - 1),
609 };
610
611
612 p9_debug(P9_DEBUG_VFS, "9p VMA close, %p, flushing", vma);
613
614 inode = file_inode(vma->vm_file);
615
616 if (!mapping_cap_writeback_dirty(inode->i_mapping))
617 wbc.nr_to_write = 0;
618
619 might_sleep();
620 sync_inode(inode, &wbc);
621}
622
623
Aneesh Kumar K.V7263ceb2011-02-28 17:03:58 +0530624static const struct vm_operations_struct v9fs_file_vm_ops = {
625 .fault = filemap_fault,
Kirill A. Shutemovf1820362014-04-07 15:37:19 -0700626 .map_pages = filemap_map_pages,
Aneesh Kumar K.V7263ceb2011-02-28 17:03:58 +0530627 .page_mkwrite = v9fs_vm_page_mkwrite,
628};
629
Dominique Martinetfb89b452014-01-10 13:44:09 +0100630static const struct vm_operations_struct v9fs_mmap_file_vm_ops = {
631 .close = v9fs_mmap_vm_close,
632 .fault = filemap_fault,
Kirill A. Shutemovf1820362014-04-07 15:37:19 -0700633 .map_pages = filemap_map_pages,
Dominique Martinetfb89b452014-01-10 13:44:09 +0100634 .page_mkwrite = v9fs_vm_page_mkwrite,
Dominique Martinetfb89b452014-01-10 13:44:09 +0100635};
636
Aneesh Kumar K.Ve959b542011-02-28 17:04:04 +0530637
Aneesh Kumar K.V29236f42011-02-28 17:03:54 +0530638const struct file_operations v9fs_cached_file_operations = {
Eric Van Hensbergene03abc02007-02-11 13:21:39 -0600639 .llseek = generic_file_llseek,
Al Viroaad4f8b2014-04-02 14:33:16 -0400640 .read_iter = generic_file_read_iter,
Al Viro81742022014-04-03 03:17:43 -0400641 .write_iter = generic_file_write_iter,
Eric Van Hensbergene03abc02007-02-11 13:21:39 -0600642 .open = v9fs_file_open,
643 .release = v9fs_dir_release,
644 .lock = v9fs_file_lock,
Aneesh Kumar K.V7263ceb2011-02-28 17:03:58 +0530645 .mmap = v9fs_file_mmap,
M. Mohan Kumar7a4439c2010-02-08 15:36:48 -0600646 .fsync = v9fs_file_fsync,
Eric Van Hensbergene03abc02007-02-11 13:21:39 -0600647};
648
Aneesh Kumar K.V29236f42011-02-28 17:03:54 +0530649const struct file_operations v9fs_cached_file_operations_dotl = {
Venkateswararao Jujjuri (JV)b04faaf2010-09-22 16:30:52 -0700650 .llseek = generic_file_llseek,
Al Viroaad4f8b2014-04-02 14:33:16 -0400651 .read_iter = generic_file_read_iter,
Al Viro81742022014-04-03 03:17:43 -0400652 .write_iter = generic_file_write_iter,
Venkateswararao Jujjuri (JV)b04faaf2010-09-22 16:30:52 -0700653 .open = v9fs_file_open,
654 .release = v9fs_dir_release,
M. Mohan Kumara0990272010-09-27 11:34:24 +0530655 .lock = v9fs_file_lock_dotl,
656 .flock = v9fs_file_flock_dotl,
Aneesh Kumar K.V7263ceb2011-02-28 17:03:58 +0530657 .mmap = v9fs_file_mmap,
Venkateswararao Jujjuri (JV)920e65d2010-09-22 17:19:19 -0700658 .fsync = v9fs_file_fsync_dotl,
Venkateswararao Jujjuri (JV)b04faaf2010-09-22 16:30:52 -0700659};
660
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -0800661const struct file_operations v9fs_file_operations = {
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700662 .llseek = generic_file_llseek,
Al Viroe494b6b2015-04-01 23:59:57 -0400663 .read_iter = v9fs_file_read_iter,
664 .write_iter = v9fs_file_write_iter,
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700665 .open = v9fs_file_open,
666 .release = v9fs_dir_release,
667 .lock = v9fs_file_lock,
Eric Van Hensbergen14b88692008-02-06 19:25:05 -0600668 .mmap = generic_file_readonly_mmap,
M. Mohan Kumar7a4439c2010-02-08 15:36:48 -0600669 .fsync = v9fs_file_fsync,
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700670};
Sripathi Kodi9b6533c2010-03-25 12:41:54 +0000671
672const struct file_operations v9fs_file_operations_dotl = {
673 .llseek = generic_file_llseek,
Al Viroe494b6b2015-04-01 23:59:57 -0400674 .read_iter = v9fs_file_read_iter,
675 .write_iter = v9fs_file_write_iter,
Sripathi Kodi9b6533c2010-03-25 12:41:54 +0000676 .open = v9fs_file_open,
677 .release = v9fs_dir_release,
M. Mohan Kumara0990272010-09-27 11:34:24 +0530678 .lock = v9fs_file_lock_dotl,
679 .flock = v9fs_file_flock_dotl,
Sripathi Kodi9b6533c2010-03-25 12:41:54 +0000680 .mmap = generic_file_readonly_mmap,
Venkateswararao Jujjuri (JV)920e65d2010-09-22 17:19:19 -0700681 .fsync = v9fs_file_fsync_dotl,
Sripathi Kodi9b6533c2010-03-25 12:41:54 +0000682};
Dominique Martinetfb89b452014-01-10 13:44:09 +0100683
684const struct file_operations v9fs_mmap_file_operations = {
685 .llseek = generic_file_llseek,
Al Viroe494b6b2015-04-01 23:59:57 -0400686 .read_iter = v9fs_mmap_file_read_iter,
687 .write_iter = v9fs_mmap_file_write_iter,
Dominique Martinetfb89b452014-01-10 13:44:09 +0100688 .open = v9fs_file_open,
689 .release = v9fs_dir_release,
690 .lock = v9fs_file_lock,
691 .mmap = v9fs_mmap_file_mmap,
692 .fsync = v9fs_file_fsync,
693};
694
695const struct file_operations v9fs_mmap_file_operations_dotl = {
696 .llseek = generic_file_llseek,
Al Viroe494b6b2015-04-01 23:59:57 -0400697 .read_iter = v9fs_mmap_file_read_iter,
698 .write_iter = v9fs_mmap_file_write_iter,
Dominique Martinetfb89b452014-01-10 13:44:09 +0100699 .open = v9fs_file_open,
700 .release = v9fs_dir_release,
701 .lock = v9fs_file_lock_dotl,
702 .flock = v9fs_file_flock_dotl,
703 .mmap = v9fs_mmap_file_mmap,
704 .fsync = v9fs_file_fsync_dotl,
705};