Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 1 | /* |
| 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 Hensbergen | 42e8c50 | 2006-03-25 03:07:28 -0800 | [diff] [blame] | 10 | * it under the terms of the GNU General Public License version 2 |
| 11 | * as published by the Free Software Foundation. |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 12 | * |
| 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 Viro | 914e263 | 2006-10-18 13:55:46 -0400 | [diff] [blame] | 29 | #include <linux/sched.h> |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 30 | #include <linux/file.h> |
| 31 | #include <linux/stat.h> |
| 32 | #include <linux/string.h> |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 33 | #include <linux/inet.h> |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 34 | #include <linux/list.h> |
Abhishek Kulkarni | 637d020 | 2009-09-22 11:34:05 -0500 | [diff] [blame] | 35 | #include <linux/pagemap.h> |
M. Mohan Kumar | a099027 | 2010-09-27 11:34:24 +0530 | [diff] [blame] | 36 | #include <linux/utsname.h> |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 37 | #include <asm/uaccess.h> |
| 38 | #include <linux/idr.h> |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 39 | #include <net/9p/9p.h> |
| 40 | #include <net/9p/client.h> |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 41 | |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 42 | #include "v9fs.h" |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 43 | #include "v9fs_vfs.h" |
| 44 | #include "fid.h" |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 45 | #include "cache.h" |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 46 | |
Aneesh Kumar K.V | 7263ceb | 2011-02-28 17:03:58 +0530 | [diff] [blame] | 47 | static const struct vm_operations_struct v9fs_file_vm_ops; |
| 48 | |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 49 | /** |
| 50 | * v9fs_file_open - open a file (or directory) |
| 51 | * @inode: inode to be opened |
| 52 | * @file: file being opened |
| 53 | * |
| 54 | */ |
| 55 | |
| 56 | int v9fs_file_open(struct inode *inode, struct file *file) |
| 57 | { |
Latchesar Ionkov | 6a3124a | 2006-03-02 02:54:30 -0800 | [diff] [blame] | 58 | int err; |
Aneesh Kumar K.V | 6b39f6d | 2011-02-28 17:04:03 +0530 | [diff] [blame] | 59 | struct v9fs_inode *v9inode; |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 60 | struct v9fs_session_info *v9ses; |
| 61 | struct p9_fid *fid; |
| 62 | int omode; |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 63 | |
Joe Perches | 5d38515 | 2011-11-28 10:40:46 -0800 | [diff] [blame] | 64 | p9_debug(P9_DEBUG_VFS, "inode: %p file: %p\n", inode, file); |
Aneesh Kumar K.V | 6b39f6d | 2011-02-28 17:04:03 +0530 | [diff] [blame] | 65 | v9inode = V9FS_I(inode); |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 66 | v9ses = v9fs_inode2v9ses(inode); |
M. Mohan Kumar | ef56547 | 2010-06-22 19:47:50 +0530 | [diff] [blame] | 67 | if (v9fs_proto_dotl(v9ses)) |
Aneesh Kumar K.V | f88657c | 2011-08-03 19:55:32 +0530 | [diff] [blame] | 68 | omode = v9fs_open_to_dotl_flags(file->f_flags); |
M. Mohan Kumar | ef56547 | 2010-06-22 19:47:50 +0530 | [diff] [blame] | 69 | else |
| 70 | omode = v9fs_uflags2omode(file->f_flags, |
| 71 | v9fs_proto_dotu(v9ses)); |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 72 | fid = file->private_data; |
| 73 | if (!fid) { |
| 74 | fid = v9fs_fid_clone(file->f_path.dentry); |
| 75 | if (IS_ERR(fid)) |
| 76 | return PTR_ERR(fid); |
| 77 | |
| 78 | err = p9_client_open(fid, omode); |
Eric Van Hensbergen | 9523a84 | 2007-07-13 13:01:27 -0500 | [diff] [blame] | 79 | if (err < 0) { |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 80 | p9_client_clunk(fid); |
| 81 | return err; |
| 82 | } |
M. Mohan Kumar | ef56547 | 2010-06-22 19:47:50 +0530 | [diff] [blame] | 83 | if (file->f_flags & O_TRUNC) { |
Abhishek Kulkarni | 7549ae3 | 2009-09-22 11:34:05 -0500 | [diff] [blame] | 84 | i_size_write(inode, 0); |
Eric Van Hensbergen | 9523a84 | 2007-07-13 13:01:27 -0500 | [diff] [blame] | 85 | inode->i_blocks = 0; |
| 86 | } |
M. Mohan Kumar | ef56547 | 2010-06-22 19:47:50 +0530 | [diff] [blame] | 87 | if ((file->f_flags & O_APPEND) && |
| 88 | (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses))) |
Eric Van Hensbergen | 2e4bef4 | 2008-06-24 17:39:39 -0500 | [diff] [blame] | 89 | generic_file_llseek(file, 0, SEEK_END); |
Latchesar Ionkov | 6a3124a | 2006-03-02 02:54:30 -0800 | [diff] [blame] | 90 | } |
| 91 | |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 92 | file->private_data = fid; |
Aneesh Kumar K.V | 5a7e0a8 | 2011-03-08 16:39:46 +0530 | [diff] [blame] | 93 | mutex_lock(&v9inode->v_mutex); |
Aneesh Kumar K.V | 7add697 | 2011-03-08 16:39:49 +0530 | [diff] [blame] | 94 | if (v9ses->cache && !v9inode->writeback_fid && |
| 95 | ((file->f_flags & O_ACCMODE) != O_RDONLY)) { |
Aneesh Kumar K.V | 3cf387d | 2011-02-28 17:03:57 +0530 | [diff] [blame] | 96 | /* |
Aneesh Kumar K.V | 6b39f6d | 2011-02-28 17:04:03 +0530 | [diff] [blame] | 97 | * clone a fid and add it to writeback_fid |
Aneesh Kumar K.V | 3cf387d | 2011-02-28 17:03:57 +0530 | [diff] [blame] | 98 | * 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.V | 5a7e0a8 | 2011-03-08 16:39:46 +0530 | [diff] [blame] | 106 | mutex_unlock(&v9inode->v_mutex); |
Aneesh Kumar K.V | 3cf387d | 2011-02-28 17:03:57 +0530 | [diff] [blame] | 107 | goto out_error; |
| 108 | } |
Aneesh Kumar K.V | 6b39f6d | 2011-02-28 17:04:03 +0530 | [diff] [blame] | 109 | v9inode->writeback_fid = (void *) fid; |
Aneesh Kumar K.V | 3cf387d | 2011-02-28 17:03:57 +0530 | [diff] [blame] | 110 | } |
Aneesh Kumar K.V | 5a7e0a8 | 2011-03-08 16:39:46 +0530 | [diff] [blame] | 111 | mutex_unlock(&v9inode->v_mutex); |
Aneesh Kumar K.V | 29236f4 | 2011-02-28 17:03:54 +0530 | [diff] [blame] | 112 | #ifdef CONFIG_9P_FSCACHE |
Aneesh Kumar K.V | 46848de | 2011-02-28 17:03:55 +0530 | [diff] [blame] | 113 | if (v9ses->cache) |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 114 | v9fs_cache_inode_set_cookie(inode, file); |
Aneesh Kumar K.V | 29236f4 | 2011-02-28 17:03:54 +0530 | [diff] [blame] | 115 | #endif |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 116 | return 0; |
Aneesh Kumar K.V | 3cf387d | 2011-02-28 17:03:57 +0530 | [diff] [blame] | 117 | out_error: |
| 118 | p9_client_clunk(file->private_data); |
| 119 | file->private_data = NULL; |
| 120 | return err; |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 121 | } |
| 122 | |
| 123 | /** |
| 124 | * v9fs_file_lock - lock a file (or directory) |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 125 | * @filp: file to be locked |
| 126 | * @cmd: lock command |
| 127 | * @fl: file lock structure |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 128 | * |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 129 | * Bugs: this looks like a local only lock, we should extend into 9P |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 130 | * by using open exclusive |
| 131 | */ |
| 132 | |
| 133 | static int v9fs_file_lock(struct file *filp, int cmd, struct file_lock *fl) |
| 134 | { |
| 135 | int res = 0; |
Josef "Jeff" Sipek | d6f787b | 2006-12-08 02:36:45 -0800 | [diff] [blame] | 136 | struct inode *inode = filp->f_path.dentry->d_inode; |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 137 | |
Joe Perches | 5d38515 | 2011-11-28 10:40:46 -0800 | [diff] [blame] | 138 | p9_debug(P9_DEBUG_VFS, "filp: %p lock: %p\n", filp, fl); |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 139 | |
| 140 | /* No mandatory locks */ |
Sachin Prabhu | f78233d | 2010-03-13 09:03:55 -0600 | [diff] [blame] | 141 | if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK) |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 142 | return -ENOLCK; |
| 143 | |
| 144 | if ((IS_SETLK(cmd) || IS_SETLKW(cmd)) && fl->fl_type != F_UNLCK) { |
OGAWA Hirofumi | 28fd129 | 2006-01-08 01:02:14 -0800 | [diff] [blame] | 145 | filemap_write_and_wait(inode->i_mapping); |
Andrew Morton | fc0ecff | 2007-02-10 01:45:39 -0800 | [diff] [blame] | 146 | invalidate_mapping_pages(&inode->i_data, 0, -1); |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 147 | } |
| 148 | |
| 149 | return res; |
| 150 | } |
| 151 | |
M. Mohan Kumar | a099027 | 2010-09-27 11:34:24 +0530 | [diff] [blame] | 152 | static int v9fs_file_do_lock(struct file *filp, int cmd, struct file_lock *fl) |
| 153 | { |
| 154 | struct p9_flock flock; |
| 155 | struct p9_fid *fid; |
| 156 | uint8_t status; |
| 157 | int res = 0; |
| 158 | unsigned char fl_type; |
| 159 | |
| 160 | fid = filp->private_data; |
| 161 | BUG_ON(fid == NULL); |
| 162 | |
| 163 | if ((fl->fl_flags & FL_POSIX) != FL_POSIX) |
| 164 | BUG(); |
| 165 | |
| 166 | res = posix_lock_file_wait(filp, fl); |
| 167 | if (res < 0) |
| 168 | goto out; |
| 169 | |
| 170 | /* convert posix lock to p9 tlock args */ |
| 171 | memset(&flock, 0, sizeof(flock)); |
Jim Garlick | 51b8b4f | 2011-08-21 00:21:18 +0530 | [diff] [blame] | 172 | /* map the lock type */ |
| 173 | switch (fl->fl_type) { |
| 174 | case F_RDLCK: |
| 175 | flock.type = P9_LOCK_TYPE_RDLCK; |
| 176 | break; |
| 177 | case F_WRLCK: |
| 178 | flock.type = P9_LOCK_TYPE_WRLCK; |
| 179 | break; |
| 180 | case F_UNLCK: |
| 181 | flock.type = P9_LOCK_TYPE_UNLCK; |
| 182 | break; |
| 183 | } |
M. Mohan Kumar | a099027 | 2010-09-27 11:34:24 +0530 | [diff] [blame] | 184 | flock.start = fl->fl_start; |
| 185 | if (fl->fl_end == OFFSET_MAX) |
| 186 | flock.length = 0; |
| 187 | else |
| 188 | flock.length = fl->fl_end - fl->fl_start + 1; |
| 189 | flock.proc_id = fl->fl_pid; |
| 190 | flock.client_id = utsname()->nodename; |
| 191 | if (IS_SETLKW(cmd)) |
| 192 | flock.flags = P9_LOCK_FLAGS_BLOCK; |
| 193 | |
| 194 | /* |
| 195 | * if its a blocked request and we get P9_LOCK_BLOCKED as the status |
| 196 | * for lock request, keep on trying |
| 197 | */ |
| 198 | for (;;) { |
| 199 | res = p9_client_lock_dotl(fid, &flock, &status); |
| 200 | if (res < 0) |
| 201 | break; |
| 202 | |
| 203 | if (status != P9_LOCK_BLOCKED) |
| 204 | break; |
| 205 | if (status == P9_LOCK_BLOCKED && !IS_SETLKW(cmd)) |
| 206 | break; |
Jim Garlick | a0ea787 | 2012-01-03 15:27:50 -0600 | [diff] [blame] | 207 | if (schedule_timeout_interruptible(P9_LOCK_TIMEOUT) != 0) |
| 208 | break; |
M. Mohan Kumar | a099027 | 2010-09-27 11:34:24 +0530 | [diff] [blame] | 209 | } |
| 210 | |
| 211 | /* map 9p status to VFS status */ |
| 212 | switch (status) { |
| 213 | case P9_LOCK_SUCCESS: |
| 214 | res = 0; |
| 215 | break; |
| 216 | case P9_LOCK_BLOCKED: |
| 217 | res = -EAGAIN; |
| 218 | break; |
| 219 | case P9_LOCK_ERROR: |
| 220 | case P9_LOCK_GRACE: |
| 221 | res = -ENOLCK; |
| 222 | break; |
| 223 | default: |
| 224 | BUG(); |
| 225 | } |
| 226 | |
| 227 | /* |
| 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 | } |
| 237 | out: |
| 238 | return res; |
| 239 | } |
| 240 | |
M. Mohan Kumar | 1d769cd | 2010-09-27 12:22:13 +0530 | [diff] [blame] | 241 | static 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 Garlick | 51b8b4f | 2011-08-21 00:21:18 +0530 | [diff] [blame] | 260 | glock.type = P9_LOCK_TYPE_UNLCK; |
M. Mohan Kumar | 1d769cd | 2010-09-27 12:22:13 +0530 | [diff] [blame] | 261 | 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; |
| 267 | glock.client_id = utsname()->nodename; |
| 268 | |
| 269 | res = p9_client_getlock_dotl(fid, &glock); |
| 270 | if (res < 0) |
| 271 | return res; |
Jim Garlick | 51b8b4f | 2011-08-21 00:21:18 +0530 | [diff] [blame] | 272 | /* 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 Kumar | 1d769cd | 2010-09-27 12:22:13 +0530 | [diff] [blame] | 285 | 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 Garlick | 51b8b4f | 2011-08-21 00:21:18 +0530 | [diff] [blame] | 291 | } |
M. Mohan Kumar | 1d769cd | 2010-09-27 12:22:13 +0530 | [diff] [blame] | 292 | return res; |
| 293 | } |
| 294 | |
M. Mohan Kumar | a099027 | 2010-09-27 11:34:24 +0530 | [diff] [blame] | 295 | /** |
| 296 | * v9fs_file_lock_dotl - lock a file (or directory) |
| 297 | * @filp: file to be locked |
| 298 | * @cmd: lock command |
| 299 | * @fl: file lock structure |
| 300 | * |
| 301 | */ |
| 302 | |
| 303 | static int v9fs_file_lock_dotl(struct file *filp, int cmd, struct file_lock *fl) |
| 304 | { |
| 305 | struct inode *inode = filp->f_path.dentry->d_inode; |
| 306 | int ret = -ENOLCK; |
| 307 | |
Joe Perches | 5d38515 | 2011-11-28 10:40:46 -0800 | [diff] [blame] | 308 | p9_debug(P9_DEBUG_VFS, "filp: %p cmd:%d lock: %p name: %s\n", |
| 309 | filp, cmd, fl, filp->f_path.dentry->d_name.name); |
M. Mohan Kumar | a099027 | 2010-09-27 11:34:24 +0530 | [diff] [blame] | 310 | |
| 311 | /* No mandatory locks */ |
| 312 | if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK) |
| 313 | goto out_err; |
| 314 | |
| 315 | if ((IS_SETLK(cmd) || IS_SETLKW(cmd)) && fl->fl_type != F_UNLCK) { |
| 316 | filemap_write_and_wait(inode->i_mapping); |
| 317 | invalidate_mapping_pages(&inode->i_data, 0, -1); |
| 318 | } |
| 319 | |
| 320 | if (IS_SETLK(cmd) || IS_SETLKW(cmd)) |
| 321 | ret = v9fs_file_do_lock(filp, cmd, fl); |
M. Mohan Kumar | 1d769cd | 2010-09-27 12:22:13 +0530 | [diff] [blame] | 322 | else if (IS_GETLK(cmd)) |
| 323 | ret = v9fs_file_getlock(filp, fl); |
M. Mohan Kumar | a099027 | 2010-09-27 11:34:24 +0530 | [diff] [blame] | 324 | else |
| 325 | ret = -EINVAL; |
| 326 | out_err: |
| 327 | return ret; |
| 328 | } |
| 329 | |
| 330 | /** |
| 331 | * v9fs_file_flock_dotl - lock a file |
| 332 | * @filp: file to be locked |
| 333 | * @cmd: lock command |
| 334 | * @fl: file lock structure |
| 335 | * |
| 336 | */ |
| 337 | |
| 338 | static int v9fs_file_flock_dotl(struct file *filp, int cmd, |
| 339 | struct file_lock *fl) |
| 340 | { |
| 341 | struct inode *inode = filp->f_path.dentry->d_inode; |
| 342 | int ret = -ENOLCK; |
| 343 | |
Joe Perches | 5d38515 | 2011-11-28 10:40:46 -0800 | [diff] [blame] | 344 | p9_debug(P9_DEBUG_VFS, "filp: %p cmd:%d lock: %p name: %s\n", |
| 345 | filp, cmd, fl, filp->f_path.dentry->d_name.name); |
M. Mohan Kumar | a099027 | 2010-09-27 11:34:24 +0530 | [diff] [blame] | 346 | |
| 347 | /* No mandatory locks */ |
| 348 | if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK) |
| 349 | goto out_err; |
| 350 | |
| 351 | if (!(fl->fl_flags & FL_FLOCK)) |
| 352 | goto out_err; |
| 353 | |
| 354 | if ((IS_SETLK(cmd) || IS_SETLKW(cmd)) && fl->fl_type != F_UNLCK) { |
| 355 | filemap_write_and_wait(inode->i_mapping); |
| 356 | invalidate_mapping_pages(&inode->i_data, 0, -1); |
| 357 | } |
| 358 | /* Convert flock to posix lock */ |
| 359 | fl->fl_owner = (fl_owner_t)filp; |
| 360 | fl->fl_start = 0; |
| 361 | fl->fl_end = OFFSET_MAX; |
| 362 | fl->fl_flags |= FL_POSIX; |
| 363 | fl->fl_flags ^= FL_FLOCK; |
| 364 | |
| 365 | if (IS_SETLK(cmd) | IS_SETLKW(cmd)) |
| 366 | ret = v9fs_file_do_lock(filp, cmd, fl); |
| 367 | else |
| 368 | ret = -EINVAL; |
| 369 | out_err: |
| 370 | return ret; |
| 371 | } |
| 372 | |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 373 | /** |
Aneesh Kumar K.V | 1731177 | 2011-02-28 17:03:56 +0530 | [diff] [blame] | 374 | * v9fs_fid_readn - read from a fid |
| 375 | * @fid: fid to read |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 376 | * @data: data buffer to read data into |
Eric Van Hensbergen | fbedadc | 2008-10-13 20:36:16 -0500 | [diff] [blame] | 377 | * @udata: user data buffer to read data into |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 378 | * @count: size of buffer |
| 379 | * @offset: offset at which to read data |
| 380 | * |
| 381 | */ |
Eric Van Hensbergen | fbedadc | 2008-10-13 20:36:16 -0500 | [diff] [blame] | 382 | ssize_t |
Aneesh Kumar K.V | 1731177 | 2011-02-28 17:03:56 +0530 | [diff] [blame] | 383 | v9fs_fid_readn(struct p9_fid *fid, char *data, char __user *udata, u32 count, |
Eric Van Hensbergen | fbedadc | 2008-10-13 20:36:16 -0500 | [diff] [blame] | 384 | u64 offset) |
| 385 | { |
M. Mohan Kumar | 97e8442 | 2010-06-04 11:59:07 +0000 | [diff] [blame] | 386 | int n, total, size; |
Eric Van Hensbergen | fbedadc | 2008-10-13 20:36:16 -0500 | [diff] [blame] | 387 | |
Joe Perches | 5d38515 | 2011-11-28 10:40:46 -0800 | [diff] [blame] | 388 | p9_debug(P9_DEBUG_VFS, "fid %d offset %llu count %d\n", |
| 389 | fid->fid, (long long unsigned)offset, count); |
Eric Van Hensbergen | fbedadc | 2008-10-13 20:36:16 -0500 | [diff] [blame] | 390 | n = 0; |
| 391 | total = 0; |
M. Mohan Kumar | 97e8442 | 2010-06-04 11:59:07 +0000 | [diff] [blame] | 392 | size = fid->iounit ? fid->iounit : fid->clnt->msize - P9_IOHDRSZ; |
Eric Van Hensbergen | fbedadc | 2008-10-13 20:36:16 -0500 | [diff] [blame] | 393 | do { |
| 394 | n = p9_client_read(fid, data, udata, offset, count); |
| 395 | if (n <= 0) |
| 396 | break; |
| 397 | |
| 398 | if (data) |
| 399 | data += n; |
| 400 | if (udata) |
| 401 | udata += n; |
| 402 | |
| 403 | offset += n; |
| 404 | count -= n; |
| 405 | total += n; |
M. Mohan Kumar | 97e8442 | 2010-06-04 11:59:07 +0000 | [diff] [blame] | 406 | } while (count > 0 && n == size); |
Eric Van Hensbergen | fbedadc | 2008-10-13 20:36:16 -0500 | [diff] [blame] | 407 | |
| 408 | if (n < 0) |
| 409 | total = n; |
| 410 | |
| 411 | return total; |
| 412 | } |
| 413 | |
| 414 | /** |
Aneesh Kumar K.V | 1731177 | 2011-02-28 17:03:56 +0530 | [diff] [blame] | 415 | * v9fs_file_readn - read from a file |
| 416 | * @filp: file pointer to read |
| 417 | * @data: data buffer to read data into |
| 418 | * @udata: user data buffer to read data into |
| 419 | * @count: size of buffer |
| 420 | * @offset: offset at which to read data |
| 421 | * |
| 422 | */ |
| 423 | ssize_t |
| 424 | v9fs_file_readn(struct file *filp, char *data, char __user *udata, u32 count, |
| 425 | u64 offset) |
| 426 | { |
| 427 | return v9fs_fid_readn(filp->private_data, data, udata, count, offset); |
| 428 | } |
| 429 | |
| 430 | /** |
Eric Van Hensbergen | fbedadc | 2008-10-13 20:36:16 -0500 | [diff] [blame] | 431 | * v9fs_file_read - read from a file |
| 432 | * @filp: file pointer to read |
| 433 | * @udata: user data buffer to read data into |
| 434 | * @count: size of buffer |
| 435 | * @offset: offset at which to read data |
| 436 | * |
| 437 | */ |
| 438 | |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 439 | static ssize_t |
Eric Van Hensbergen | fbedadc | 2008-10-13 20:36:16 -0500 | [diff] [blame] | 440 | v9fs_file_read(struct file *filp, char __user *udata, size_t count, |
Latchesar Ionkov | 19cba8a | 2005-10-11 08:29:03 -0700 | [diff] [blame] | 441 | loff_t * offset) |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 442 | { |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 443 | int ret; |
| 444 | struct p9_fid *fid; |
M. Mohan Kumar | 97e8442 | 2010-06-04 11:59:07 +0000 | [diff] [blame] | 445 | size_t size; |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 446 | |
Joe Perches | 5d38515 | 2011-11-28 10:40:46 -0800 | [diff] [blame] | 447 | p9_debug(P9_DEBUG_VFS, "count %zu offset %lld\n", count, *offset); |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 448 | fid = filp->private_data; |
Eric Van Hensbergen | fbedadc | 2008-10-13 20:36:16 -0500 | [diff] [blame] | 449 | |
M. Mohan Kumar | 97e8442 | 2010-06-04 11:59:07 +0000 | [diff] [blame] | 450 | size = fid->iounit ? fid->iounit : fid->clnt->msize - P9_IOHDRSZ; |
| 451 | if (count > size) |
Eric Van Hensbergen | fbedadc | 2008-10-13 20:36:16 -0500 | [diff] [blame] | 452 | ret = v9fs_file_readn(filp, NULL, udata, count, *offset); |
| 453 | else |
| 454 | ret = p9_client_read(fid, NULL, udata, *offset, count); |
| 455 | |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 456 | if (ret > 0) |
| 457 | *offset += ret; |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 458 | |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 459 | return ret; |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 460 | } |
| 461 | |
Aneesh Kumar K.V | 1731177 | 2011-02-28 17:03:56 +0530 | [diff] [blame] | 462 | ssize_t |
| 463 | v9fs_file_write_internal(struct inode *inode, struct p9_fid *fid, |
| 464 | const char __user *data, size_t count, |
| 465 | loff_t *offset, int invalidate) |
| 466 | { |
| 467 | int n; |
Aneesh Kumar K.V | fa6ea16 | 2011-02-28 17:04:04 +0530 | [diff] [blame] | 468 | loff_t i_size; |
Aneesh Kumar K.V | 1731177 | 2011-02-28 17:03:56 +0530 | [diff] [blame] | 469 | size_t total = 0; |
| 470 | struct p9_client *clnt; |
| 471 | loff_t origin = *offset; |
| 472 | unsigned long pg_start, pg_end; |
| 473 | |
Joe Perches | 5d38515 | 2011-11-28 10:40:46 -0800 | [diff] [blame] | 474 | p9_debug(P9_DEBUG_VFS, "data %p count %d offset %x\n", |
| 475 | data, (int)count, (int)*offset); |
Aneesh Kumar K.V | 1731177 | 2011-02-28 17:03:56 +0530 | [diff] [blame] | 476 | |
| 477 | clnt = fid->clnt; |
| 478 | do { |
| 479 | n = p9_client_write(fid, NULL, data+total, origin+total, count); |
| 480 | if (n <= 0) |
| 481 | break; |
| 482 | count -= n; |
| 483 | total += n; |
| 484 | } while (count > 0); |
| 485 | |
| 486 | if (invalidate && (total > 0)) { |
| 487 | pg_start = origin >> PAGE_CACHE_SHIFT; |
| 488 | pg_end = (origin + total - 1) >> PAGE_CACHE_SHIFT; |
| 489 | if (inode->i_mapping && inode->i_mapping->nrpages) |
| 490 | invalidate_inode_pages2_range(inode->i_mapping, |
| 491 | pg_start, pg_end); |
| 492 | *offset += total; |
Aneesh Kumar K.V | fa6ea16 | 2011-02-28 17:04:04 +0530 | [diff] [blame] | 493 | i_size = i_size_read(inode); |
| 494 | if (*offset > i_size) { |
| 495 | inode_add_bytes(inode, *offset - i_size); |
| 496 | i_size_write(inode, *offset); |
| 497 | } |
Aneesh Kumar K.V | 1731177 | 2011-02-28 17:03:56 +0530 | [diff] [blame] | 498 | } |
| 499 | if (n < 0) |
| 500 | return n; |
| 501 | |
| 502 | return total; |
| 503 | } |
| 504 | |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 505 | /** |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 506 | * v9fs_file_write - write to a file |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 507 | * @filp: file pointer to write |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 508 | * @data: data buffer to write data from |
| 509 | * @count: size of buffer |
| 510 | * @offset: offset at which to write data |
| 511 | * |
| 512 | */ |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 513 | static ssize_t |
| 514 | v9fs_file_write(struct file *filp, const char __user * data, |
Aneesh Kumar K.V | 1731177 | 2011-02-28 17:03:56 +0530 | [diff] [blame] | 515 | size_t count, loff_t *offset) |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 516 | { |
Aneesh Kumar K.V | 1731177 | 2011-02-28 17:03:56 +0530 | [diff] [blame] | 517 | ssize_t retval = 0; |
jvrao | fc0f296 | 2010-03-08 22:07:02 +0000 | [diff] [blame] | 518 | loff_t origin = *offset; |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 519 | |
Eric Van Hensbergen | dfb0ec2 | 2008-10-13 20:36:16 -0500 | [diff] [blame] | 520 | |
Harsh Prateek Bora | 3834b12 | 2010-08-03 11:55:40 +0000 | [diff] [blame] | 521 | retval = generic_write_checks(filp, &origin, &count, 0); |
| 522 | if (retval) |
| 523 | goto out; |
| 524 | |
| 525 | retval = -EINVAL; |
| 526 | if ((ssize_t) count < 0) |
| 527 | goto out; |
| 528 | retval = 0; |
| 529 | if (!count) |
| 530 | goto out; |
| 531 | |
M. Mohan Kumar | aaf0ef1 | 2011-03-16 21:40:49 +0530 | [diff] [blame] | 532 | retval = v9fs_file_write_internal(filp->f_path.dentry->d_inode, |
Aneesh Kumar K.V | 1731177 | 2011-02-28 17:03:56 +0530 | [diff] [blame] | 533 | filp->private_data, |
M. Mohan Kumar | aaf0ef1 | 2011-03-16 21:40:49 +0530 | [diff] [blame] | 534 | data, count, &origin, 1); |
| 535 | /* update offset on successful write */ |
| 536 | if (retval > 0) |
| 537 | *offset = origin; |
Harsh Prateek Bora | 3834b12 | 2010-08-03 11:55:40 +0000 | [diff] [blame] | 538 | out: |
| 539 | return retval; |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 540 | } |
| 541 | |
Aneesh Kumar K.V | 7263ceb | 2011-02-28 17:03:58 +0530 | [diff] [blame] | 542 | |
Josef Bacik | 02c24a8 | 2011-07-16 20:44:56 -0400 | [diff] [blame] | 543 | static int v9fs_file_fsync(struct file *filp, loff_t start, loff_t end, |
| 544 | int datasync) |
M. Mohan Kumar | 7a4439c | 2010-02-08 15:36:48 -0600 | [diff] [blame] | 545 | { |
| 546 | struct p9_fid *fid; |
Josef Bacik | 02c24a8 | 2011-07-16 20:44:56 -0400 | [diff] [blame] | 547 | struct inode *inode = filp->f_mapping->host; |
M. Mohan Kumar | 7a4439c | 2010-02-08 15:36:48 -0600 | [diff] [blame] | 548 | struct p9_wstat wstat; |
| 549 | int retval; |
| 550 | |
Josef Bacik | 02c24a8 | 2011-07-16 20:44:56 -0400 | [diff] [blame] | 551 | retval = filemap_write_and_wait_range(inode->i_mapping, start, end); |
| 552 | if (retval) |
| 553 | return retval; |
| 554 | |
| 555 | mutex_lock(&inode->i_mutex); |
Joe Perches | 5d38515 | 2011-11-28 10:40:46 -0800 | [diff] [blame] | 556 | p9_debug(P9_DEBUG_VFS, "filp %p datasync %x\n", filp, datasync); |
M. Mohan Kumar | 7a4439c | 2010-02-08 15:36:48 -0600 | [diff] [blame] | 557 | |
| 558 | fid = filp->private_data; |
| 559 | v9fs_blank_wstat(&wstat); |
| 560 | |
| 561 | retval = p9_client_wstat(fid, &wstat); |
Josef Bacik | 02c24a8 | 2011-07-16 20:44:56 -0400 | [diff] [blame] | 562 | mutex_unlock(&inode->i_mutex); |
| 563 | |
M. Mohan Kumar | 7a4439c | 2010-02-08 15:36:48 -0600 | [diff] [blame] | 564 | return retval; |
| 565 | } |
| 566 | |
Josef Bacik | 02c24a8 | 2011-07-16 20:44:56 -0400 | [diff] [blame] | 567 | int v9fs_file_fsync_dotl(struct file *filp, loff_t start, loff_t end, |
| 568 | int datasync) |
Venkateswararao Jujjuri (JV) | 920e65d | 2010-09-22 17:19:19 -0700 | [diff] [blame] | 569 | { |
| 570 | struct p9_fid *fid; |
Josef Bacik | 02c24a8 | 2011-07-16 20:44:56 -0400 | [diff] [blame] | 571 | struct inode *inode = filp->f_mapping->host; |
Venkateswararao Jujjuri (JV) | 920e65d | 2010-09-22 17:19:19 -0700 | [diff] [blame] | 572 | int retval; |
| 573 | |
Josef Bacik | 02c24a8 | 2011-07-16 20:44:56 -0400 | [diff] [blame] | 574 | retval = filemap_write_and_wait_range(inode->i_mapping, start, end); |
| 575 | if (retval) |
| 576 | return retval; |
| 577 | |
| 578 | mutex_lock(&inode->i_mutex); |
Joe Perches | 5d38515 | 2011-11-28 10:40:46 -0800 | [diff] [blame] | 579 | p9_debug(P9_DEBUG_VFS, "filp %p datasync %x\n", filp, datasync); |
Venkateswararao Jujjuri (JV) | 920e65d | 2010-09-22 17:19:19 -0700 | [diff] [blame] | 580 | |
| 581 | fid = filp->private_data; |
| 582 | |
Venkateswararao Jujjuri (JV) | b165d60 | 2010-10-22 10:13:12 -0700 | [diff] [blame] | 583 | retval = p9_client_fsync(fid, datasync); |
Josef Bacik | 02c24a8 | 2011-07-16 20:44:56 -0400 | [diff] [blame] | 584 | mutex_unlock(&inode->i_mutex); |
| 585 | |
Venkateswararao Jujjuri (JV) | 920e65d | 2010-09-22 17:19:19 -0700 | [diff] [blame] | 586 | return retval; |
| 587 | } |
| 588 | |
Aneesh Kumar K.V | 7263ceb | 2011-02-28 17:03:58 +0530 | [diff] [blame] | 589 | static int |
| 590 | v9fs_file_mmap(struct file *file, struct vm_area_struct *vma) |
| 591 | { |
| 592 | int retval; |
| 593 | |
| 594 | retval = generic_file_mmap(file, vma); |
| 595 | if (!retval) |
| 596 | vma->vm_ops = &v9fs_file_vm_ops; |
| 597 | |
| 598 | return retval; |
| 599 | } |
| 600 | |
| 601 | static int |
| 602 | v9fs_vm_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) |
| 603 | { |
Aneesh Kumar K.V | 6b39f6d | 2011-02-28 17:04:03 +0530 | [diff] [blame] | 604 | struct v9fs_inode *v9inode; |
Aneesh Kumar K.V | 7263ceb | 2011-02-28 17:03:58 +0530 | [diff] [blame] | 605 | struct page *page = vmf->page; |
| 606 | struct file *filp = vma->vm_file; |
| 607 | struct inode *inode = filp->f_path.dentry->d_inode; |
| 608 | |
| 609 | |
Joe Perches | 5d38515 | 2011-11-28 10:40:46 -0800 | [diff] [blame] | 610 | p9_debug(P9_DEBUG_VFS, "page %p fid %lx\n", |
| 611 | page, (unsigned long)filp->private_data); |
Aneesh Kumar K.V | 7263ceb | 2011-02-28 17:03:58 +0530 | [diff] [blame] | 612 | |
Jan Kara | 120c2bc | 2012-06-12 16:20:25 +0200 | [diff] [blame] | 613 | /* Update file times before taking page lock */ |
| 614 | file_update_time(filp); |
| 615 | |
Aneesh Kumar K.V | 6b39f6d | 2011-02-28 17:04:03 +0530 | [diff] [blame] | 616 | v9inode = V9FS_I(inode); |
Aneesh Kumar K.V | 7263ceb | 2011-02-28 17:03:58 +0530 | [diff] [blame] | 617 | /* make sure the cache has finished storing the page */ |
| 618 | v9fs_fscache_wait_on_page_write(inode, page); |
Aneesh Kumar K.V | 6b39f6d | 2011-02-28 17:04:03 +0530 | [diff] [blame] | 619 | BUG_ON(!v9inode->writeback_fid); |
Aneesh Kumar K.V | 7263ceb | 2011-02-28 17:03:58 +0530 | [diff] [blame] | 620 | lock_page(page); |
| 621 | if (page->mapping != inode->i_mapping) |
| 622 | goto out_unlock; |
| 623 | |
| 624 | return VM_FAULT_LOCKED; |
| 625 | out_unlock: |
| 626 | unlock_page(page); |
| 627 | return VM_FAULT_NOPAGE; |
| 628 | } |
| 629 | |
Aneesh Kumar K.V | e959b54 | 2011-02-28 17:04:04 +0530 | [diff] [blame] | 630 | static ssize_t |
| 631 | v9fs_direct_read(struct file *filp, char __user *udata, size_t count, |
| 632 | loff_t *offsetp) |
| 633 | { |
| 634 | loff_t size, offset; |
| 635 | struct inode *inode; |
| 636 | struct address_space *mapping; |
| 637 | |
| 638 | offset = *offsetp; |
| 639 | mapping = filp->f_mapping; |
| 640 | inode = mapping->host; |
| 641 | if (!count) |
| 642 | return 0; |
| 643 | size = i_size_read(inode); |
| 644 | if (offset < size) |
| 645 | filemap_write_and_wait_range(mapping, offset, |
| 646 | offset + count - 1); |
| 647 | |
| 648 | return v9fs_file_read(filp, udata, count, offsetp); |
| 649 | } |
| 650 | |
| 651 | /** |
| 652 | * v9fs_cached_file_read - read from a file |
| 653 | * @filp: file pointer to read |
| 654 | * @udata: user data buffer to read data into |
| 655 | * @count: size of buffer |
| 656 | * @offset: offset at which to read data |
| 657 | * |
| 658 | */ |
| 659 | static ssize_t |
| 660 | v9fs_cached_file_read(struct file *filp, char __user *data, size_t count, |
| 661 | loff_t *offset) |
| 662 | { |
| 663 | if (filp->f_flags & O_DIRECT) |
| 664 | return v9fs_direct_read(filp, data, count, offset); |
| 665 | return do_sync_read(filp, data, count, offset); |
| 666 | } |
| 667 | |
| 668 | static ssize_t |
| 669 | v9fs_direct_write(struct file *filp, const char __user * data, |
| 670 | size_t count, loff_t *offsetp) |
| 671 | { |
| 672 | loff_t offset; |
| 673 | ssize_t retval; |
| 674 | struct inode *inode; |
| 675 | struct address_space *mapping; |
| 676 | |
| 677 | offset = *offsetp; |
| 678 | mapping = filp->f_mapping; |
| 679 | inode = mapping->host; |
| 680 | if (!count) |
| 681 | return 0; |
| 682 | |
| 683 | mutex_lock(&inode->i_mutex); |
| 684 | retval = filemap_write_and_wait_range(mapping, offset, |
| 685 | offset + count - 1); |
| 686 | if (retval) |
| 687 | goto err_out; |
| 688 | /* |
| 689 | * After a write we want buffered reads to be sure to go to disk to get |
| 690 | * the new data. We invalidate clean cached page from the region we're |
| 691 | * about to write. We do this *before* the write so that if we fail |
| 692 | * here we fall back to buffered write |
| 693 | */ |
| 694 | if (mapping->nrpages) { |
| 695 | pgoff_t pg_start = offset >> PAGE_CACHE_SHIFT; |
| 696 | pgoff_t pg_end = (offset + count - 1) >> PAGE_CACHE_SHIFT; |
| 697 | |
| 698 | retval = invalidate_inode_pages2_range(mapping, |
| 699 | pg_start, pg_end); |
| 700 | /* |
| 701 | * If a page can not be invalidated, fall back |
| 702 | * to buffered write. |
| 703 | */ |
| 704 | if (retval) { |
| 705 | if (retval == -EBUSY) |
| 706 | goto buff_write; |
| 707 | goto err_out; |
| 708 | } |
| 709 | } |
| 710 | retval = v9fs_file_write(filp, data, count, offsetp); |
| 711 | err_out: |
| 712 | mutex_unlock(&inode->i_mutex); |
| 713 | return retval; |
| 714 | |
| 715 | buff_write: |
| 716 | mutex_unlock(&inode->i_mutex); |
| 717 | return do_sync_write(filp, data, count, offsetp); |
| 718 | } |
| 719 | |
| 720 | /** |
| 721 | * v9fs_cached_file_write - write to a file |
| 722 | * @filp: file pointer to write |
| 723 | * @data: data buffer to write data from |
| 724 | * @count: size of buffer |
| 725 | * @offset: offset at which to write data |
| 726 | * |
| 727 | */ |
| 728 | static ssize_t |
| 729 | v9fs_cached_file_write(struct file *filp, const char __user * data, |
| 730 | size_t count, loff_t *offset) |
| 731 | { |
| 732 | |
| 733 | if (filp->f_flags & O_DIRECT) |
| 734 | return v9fs_direct_write(filp, data, count, offset); |
| 735 | return do_sync_write(filp, data, count, offset); |
| 736 | } |
| 737 | |
Aneesh Kumar K.V | 7263ceb | 2011-02-28 17:03:58 +0530 | [diff] [blame] | 738 | static const struct vm_operations_struct v9fs_file_vm_ops = { |
| 739 | .fault = filemap_fault, |
| 740 | .page_mkwrite = v9fs_vm_page_mkwrite, |
Konstantin Khlebnikov | 0b173bc | 2012-10-08 16:28:46 -0700 | [diff] [blame] | 741 | .remap_pages = generic_file_remap_pages, |
Aneesh Kumar K.V | 7263ceb | 2011-02-28 17:03:58 +0530 | [diff] [blame] | 742 | }; |
| 743 | |
Aneesh Kumar K.V | e959b54 | 2011-02-28 17:04:04 +0530 | [diff] [blame] | 744 | |
Aneesh Kumar K.V | 29236f4 | 2011-02-28 17:03:54 +0530 | [diff] [blame] | 745 | const struct file_operations v9fs_cached_file_operations = { |
Eric Van Hensbergen | e03abc0 | 2007-02-11 13:21:39 -0600 | [diff] [blame] | 746 | .llseek = generic_file_llseek, |
Aneesh Kumar K.V | e959b54 | 2011-02-28 17:04:04 +0530 | [diff] [blame] | 747 | .read = v9fs_cached_file_read, |
| 748 | .write = v9fs_cached_file_write, |
Eric Van Hensbergen | e03abc0 | 2007-02-11 13:21:39 -0600 | [diff] [blame] | 749 | .aio_read = generic_file_aio_read, |
Aneesh Kumar K.V | 7263ceb | 2011-02-28 17:03:58 +0530 | [diff] [blame] | 750 | .aio_write = generic_file_aio_write, |
Eric Van Hensbergen | e03abc0 | 2007-02-11 13:21:39 -0600 | [diff] [blame] | 751 | .open = v9fs_file_open, |
| 752 | .release = v9fs_dir_release, |
| 753 | .lock = v9fs_file_lock, |
Aneesh Kumar K.V | 7263ceb | 2011-02-28 17:03:58 +0530 | [diff] [blame] | 754 | .mmap = v9fs_file_mmap, |
M. Mohan Kumar | 7a4439c | 2010-02-08 15:36:48 -0600 | [diff] [blame] | 755 | .fsync = v9fs_file_fsync, |
Eric Van Hensbergen | e03abc0 | 2007-02-11 13:21:39 -0600 | [diff] [blame] | 756 | }; |
| 757 | |
Aneesh Kumar K.V | 29236f4 | 2011-02-28 17:03:54 +0530 | [diff] [blame] | 758 | const struct file_operations v9fs_cached_file_operations_dotl = { |
Venkateswararao Jujjuri (JV) | b04faaf | 2010-09-22 16:30:52 -0700 | [diff] [blame] | 759 | .llseek = generic_file_llseek, |
Aneesh Kumar K.V | e959b54 | 2011-02-28 17:04:04 +0530 | [diff] [blame] | 760 | .read = v9fs_cached_file_read, |
| 761 | .write = v9fs_cached_file_write, |
Venkateswararao Jujjuri (JV) | b04faaf | 2010-09-22 16:30:52 -0700 | [diff] [blame] | 762 | .aio_read = generic_file_aio_read, |
Aneesh Kumar K.V | 7263ceb | 2011-02-28 17:03:58 +0530 | [diff] [blame] | 763 | .aio_write = generic_file_aio_write, |
Venkateswararao Jujjuri (JV) | b04faaf | 2010-09-22 16:30:52 -0700 | [diff] [blame] | 764 | .open = v9fs_file_open, |
| 765 | .release = v9fs_dir_release, |
M. Mohan Kumar | a099027 | 2010-09-27 11:34:24 +0530 | [diff] [blame] | 766 | .lock = v9fs_file_lock_dotl, |
| 767 | .flock = v9fs_file_flock_dotl, |
Aneesh Kumar K.V | 7263ceb | 2011-02-28 17:03:58 +0530 | [diff] [blame] | 768 | .mmap = v9fs_file_mmap, |
Venkateswararao Jujjuri (JV) | 920e65d | 2010-09-22 17:19:19 -0700 | [diff] [blame] | 769 | .fsync = v9fs_file_fsync_dotl, |
Venkateswararao Jujjuri (JV) | b04faaf | 2010-09-22 16:30:52 -0700 | [diff] [blame] | 770 | }; |
| 771 | |
Arjan van de Ven | 4b6f5d2 | 2006-03-28 01:56:42 -0800 | [diff] [blame] | 772 | const struct file_operations v9fs_file_operations = { |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 773 | .llseek = generic_file_llseek, |
| 774 | .read = v9fs_file_read, |
| 775 | .write = v9fs_file_write, |
| 776 | .open = v9fs_file_open, |
| 777 | .release = v9fs_dir_release, |
| 778 | .lock = v9fs_file_lock, |
Eric Van Hensbergen | 14b8869 | 2008-02-06 19:25:05 -0600 | [diff] [blame] | 779 | .mmap = generic_file_readonly_mmap, |
M. Mohan Kumar | 7a4439c | 2010-02-08 15:36:48 -0600 | [diff] [blame] | 780 | .fsync = v9fs_file_fsync, |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 781 | }; |
Sripathi Kodi | 9b6533c | 2010-03-25 12:41:54 +0000 | [diff] [blame] | 782 | |
| 783 | const struct file_operations v9fs_file_operations_dotl = { |
| 784 | .llseek = generic_file_llseek, |
| 785 | .read = v9fs_file_read, |
| 786 | .write = v9fs_file_write, |
| 787 | .open = v9fs_file_open, |
| 788 | .release = v9fs_dir_release, |
M. Mohan Kumar | a099027 | 2010-09-27 11:34:24 +0530 | [diff] [blame] | 789 | .lock = v9fs_file_lock_dotl, |
| 790 | .flock = v9fs_file_flock_dotl, |
Sripathi Kodi | 9b6533c | 2010-03-25 12:41:54 +0000 | [diff] [blame] | 791 | .mmap = generic_file_readonly_mmap, |
Venkateswararao Jujjuri (JV) | 920e65d | 2010-09-22 17:19:19 -0700 | [diff] [blame] | 792 | .fsync = v9fs_file_fsync_dotl, |
Sripathi Kodi | 9b6533c | 2010-03-25 12:41:54 +0000 | [diff] [blame] | 793 | }; |