2 * linux/fs/9p/vfs_file.c
4 * This file contians vfs file ops for 9P2000.
6 * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
7 * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2
11 * as published by the Free Software Foundation.
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.
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
26 #include <linux/module.h>
27 #include <linux/errno.h>
29 #include <linux/sched.h>
30 #include <linux/file.h>
31 #include <linux/stat.h>
32 #include <linux/string.h>
33 #include <linux/inet.h>
34 #include <linux/list.h>
35 #include <linux/pagemap.h>
36 #include <linux/utsname.h>
37 #include <asm/uaccess.h>
38 #include <linux/idr.h>
39 #include <net/9p/9p.h>
40 #include <net/9p/client.h>
47 static const struct vm_operations_struct v9fs_file_vm_ops
;
50 * v9fs_file_open - open a file (or directory)
51 * @inode: inode to be opened
52 * @file: file being opened
56 int v9fs_file_open(struct inode
*inode
, struct file
*file
)
59 struct v9fs_session_info
*v9ses
;
63 P9_DPRINTK(P9_DEBUG_VFS
, "inode: %p file: %p\n", inode
, file
);
64 v9ses
= v9fs_inode2v9ses(inode
);
65 if (v9fs_proto_dotl(v9ses
))
66 omode
= file
->f_flags
;
68 omode
= v9fs_uflags2omode(file
->f_flags
,
69 v9fs_proto_dotu(v9ses
));
70 fid
= file
->private_data
;
72 fid
= v9fs_fid_clone(file
->f_path
.dentry
);
76 err
= p9_client_open(fid
, omode
);
81 if (file
->f_flags
& O_TRUNC
) {
82 i_size_write(inode
, 0);
85 if ((file
->f_flags
& O_APPEND
) &&
86 (!v9fs_proto_dotu(v9ses
) && !v9fs_proto_dotl(v9ses
)))
87 generic_file_llseek(file
, 0, SEEK_END
);
90 file
->private_data
= fid
;
91 if (v9ses
->cache
&& !inode
->i_private
) {
93 * clone a fid and add it to inode->i_private
94 * we do it during open time instead of
95 * page dirty time via write_begin/page_mkwrite
96 * because we want write after unlink usecase
99 fid
= v9fs_writeback_fid(file
->f_path
.dentry
);
104 inode
->i_private
= (void *) fid
;
106 #ifdef CONFIG_9P_FSCACHE
108 v9fs_cache_inode_set_cookie(inode
, file
);
112 p9_client_clunk(file
->private_data
);
113 file
->private_data
= NULL
;
118 * v9fs_file_lock - lock a file (or directory)
119 * @filp: file to be locked
121 * @fl: file lock structure
123 * Bugs: this looks like a local only lock, we should extend into 9P
124 * by using open exclusive
127 static int v9fs_file_lock(struct file
*filp
, int cmd
, struct file_lock
*fl
)
130 struct inode
*inode
= filp
->f_path
.dentry
->d_inode
;
132 P9_DPRINTK(P9_DEBUG_VFS
, "filp: %p lock: %p\n", filp
, fl
);
134 /* No mandatory locks */
135 if (__mandatory_lock(inode
) && fl
->fl_type
!= F_UNLCK
)
138 if ((IS_SETLK(cmd
) || IS_SETLKW(cmd
)) && fl
->fl_type
!= F_UNLCK
) {
139 filemap_write_and_wait(inode
->i_mapping
);
140 invalidate_mapping_pages(&inode
->i_data
, 0, -1);
146 static int v9fs_file_do_lock(struct file
*filp
, int cmd
, struct file_lock
*fl
)
148 struct p9_flock flock
;
152 unsigned char fl_type
;
154 fid
= filp
->private_data
;
157 if ((fl
->fl_flags
& FL_POSIX
) != FL_POSIX
)
160 res
= posix_lock_file_wait(filp
, fl
);
164 /* convert posix lock to p9 tlock args */
165 memset(&flock
, 0, sizeof(flock
));
166 flock
.type
= fl
->fl_type
;
167 flock
.start
= fl
->fl_start
;
168 if (fl
->fl_end
== OFFSET_MAX
)
171 flock
.length
= fl
->fl_end
- fl
->fl_start
+ 1;
172 flock
.proc_id
= fl
->fl_pid
;
173 flock
.client_id
= utsname()->nodename
;
175 flock
.flags
= P9_LOCK_FLAGS_BLOCK
;
178 * if its a blocked request and we get P9_LOCK_BLOCKED as the status
179 * for lock request, keep on trying
182 res
= p9_client_lock_dotl(fid
, &flock
, &status
);
186 if (status
!= P9_LOCK_BLOCKED
)
188 if (status
== P9_LOCK_BLOCKED
&& !IS_SETLKW(cmd
))
190 schedule_timeout_interruptible(P9_LOCK_TIMEOUT
);
193 /* map 9p status to VFS status */
195 case P9_LOCK_SUCCESS
:
198 case P9_LOCK_BLOCKED
:
210 * incase server returned error for lock request, revert
213 if (res
< 0 && fl
->fl_type
!= F_UNLCK
) {
214 fl_type
= fl
->fl_type
;
215 fl
->fl_type
= F_UNLCK
;
216 res
= posix_lock_file_wait(filp
, fl
);
217 fl
->fl_type
= fl_type
;
223 static int v9fs_file_getlock(struct file
*filp
, struct file_lock
*fl
)
225 struct p9_getlock glock
;
229 fid
= filp
->private_data
;
232 posix_test_lock(filp
, fl
);
234 * if we have a conflicting lock locally, no need to validate
237 if (fl
->fl_type
!= F_UNLCK
)
240 /* convert posix lock to p9 tgetlock args */
241 memset(&glock
, 0, sizeof(glock
));
242 glock
.type
= fl
->fl_type
;
243 glock
.start
= fl
->fl_start
;
244 if (fl
->fl_end
== OFFSET_MAX
)
247 glock
.length
= fl
->fl_end
- fl
->fl_start
+ 1;
248 glock
.proc_id
= fl
->fl_pid
;
249 glock
.client_id
= utsname()->nodename
;
251 res
= p9_client_getlock_dotl(fid
, &glock
);
254 if (glock
.type
!= F_UNLCK
) {
255 fl
->fl_type
= glock
.type
;
256 fl
->fl_start
= glock
.start
;
257 if (glock
.length
== 0)
258 fl
->fl_end
= OFFSET_MAX
;
260 fl
->fl_end
= glock
.start
+ glock
.length
- 1;
261 fl
->fl_pid
= glock
.proc_id
;
263 fl
->fl_type
= F_UNLCK
;
269 * v9fs_file_lock_dotl - lock a file (or directory)
270 * @filp: file to be locked
272 * @fl: file lock structure
276 static int v9fs_file_lock_dotl(struct file
*filp
, int cmd
, struct file_lock
*fl
)
278 struct inode
*inode
= filp
->f_path
.dentry
->d_inode
;
281 P9_DPRINTK(P9_DEBUG_VFS
, "filp: %p cmd:%d lock: %p name: %s\n", filp
,
282 cmd
, fl
, filp
->f_path
.dentry
->d_name
.name
);
284 /* No mandatory locks */
285 if (__mandatory_lock(inode
) && fl
->fl_type
!= F_UNLCK
)
288 if ((IS_SETLK(cmd
) || IS_SETLKW(cmd
)) && fl
->fl_type
!= F_UNLCK
) {
289 filemap_write_and_wait(inode
->i_mapping
);
290 invalidate_mapping_pages(&inode
->i_data
, 0, -1);
293 if (IS_SETLK(cmd
) || IS_SETLKW(cmd
))
294 ret
= v9fs_file_do_lock(filp
, cmd
, fl
);
295 else if (IS_GETLK(cmd
))
296 ret
= v9fs_file_getlock(filp
, fl
);
304 * v9fs_file_flock_dotl - lock a file
305 * @filp: file to be locked
307 * @fl: file lock structure
311 static int v9fs_file_flock_dotl(struct file
*filp
, int cmd
,
312 struct file_lock
*fl
)
314 struct inode
*inode
= filp
->f_path
.dentry
->d_inode
;
317 P9_DPRINTK(P9_DEBUG_VFS
, "filp: %p cmd:%d lock: %p name: %s\n", filp
,
318 cmd
, fl
, filp
->f_path
.dentry
->d_name
.name
);
320 /* No mandatory locks */
321 if (__mandatory_lock(inode
) && fl
->fl_type
!= F_UNLCK
)
324 if (!(fl
->fl_flags
& FL_FLOCK
))
327 if ((IS_SETLK(cmd
) || IS_SETLKW(cmd
)) && fl
->fl_type
!= F_UNLCK
) {
328 filemap_write_and_wait(inode
->i_mapping
);
329 invalidate_mapping_pages(&inode
->i_data
, 0, -1);
331 /* Convert flock to posix lock */
332 fl
->fl_owner
= (fl_owner_t
)filp
;
334 fl
->fl_end
= OFFSET_MAX
;
335 fl
->fl_flags
|= FL_POSIX
;
336 fl
->fl_flags
^= FL_FLOCK
;
338 if (IS_SETLK(cmd
) | IS_SETLKW(cmd
))
339 ret
= v9fs_file_do_lock(filp
, cmd
, fl
);
347 * v9fs_fid_readn - read from a fid
349 * @data: data buffer to read data into
350 * @udata: user data buffer to read data into
351 * @count: size of buffer
352 * @offset: offset at which to read data
356 v9fs_fid_readn(struct p9_fid
*fid
, char *data
, char __user
*udata
, u32 count
,
361 P9_DPRINTK(P9_DEBUG_VFS
, "fid %d offset %llu count %d\n", fid
->fid
,
362 (long long unsigned) offset
, count
);
365 size
= fid
->iounit
? fid
->iounit
: fid
->clnt
->msize
- P9_IOHDRSZ
;
367 n
= p9_client_read(fid
, data
, udata
, offset
, count
);
379 } while (count
> 0 && n
== size
);
388 * v9fs_file_readn - read from a file
389 * @filp: file pointer to read
390 * @data: data buffer to read data into
391 * @udata: user data buffer to read data into
392 * @count: size of buffer
393 * @offset: offset at which to read data
397 v9fs_file_readn(struct file
*filp
, char *data
, char __user
*udata
, u32 count
,
400 return v9fs_fid_readn(filp
->private_data
, data
, udata
, count
, offset
);
404 * v9fs_file_read - read from a file
405 * @filp: file pointer to read
406 * @udata: user data buffer to read data into
407 * @count: size of buffer
408 * @offset: offset at which to read data
413 v9fs_file_read(struct file
*filp
, char __user
*udata
, size_t count
,
420 P9_DPRINTK(P9_DEBUG_VFS
, "count %zu offset %lld\n", count
, *offset
);
421 fid
= filp
->private_data
;
423 size
= fid
->iounit
? fid
->iounit
: fid
->clnt
->msize
- P9_IOHDRSZ
;
425 ret
= v9fs_file_readn(filp
, NULL
, udata
, count
, *offset
);
427 ret
= p9_client_read(fid
, NULL
, udata
, *offset
, count
);
436 v9fs_file_write_internal(struct inode
*inode
, struct p9_fid
*fid
,
437 const char __user
*data
, size_t count
,
438 loff_t
*offset
, int invalidate
)
442 struct p9_client
*clnt
;
443 loff_t origin
= *offset
;
444 unsigned long pg_start
, pg_end
;
446 P9_DPRINTK(P9_DEBUG_VFS
, "data %p count %d offset %x\n", data
,
447 (int)count
, (int)*offset
);
451 n
= p9_client_write(fid
, NULL
, data
+total
, origin
+total
, count
);
458 if (invalidate
&& (total
> 0)) {
459 pg_start
= origin
>> PAGE_CACHE_SHIFT
;
460 pg_end
= (origin
+ total
- 1) >> PAGE_CACHE_SHIFT
;
461 if (inode
->i_mapping
&& inode
->i_mapping
->nrpages
)
462 invalidate_inode_pages2_range(inode
->i_mapping
,
465 i_size_write(inode
, i_size_read(inode
) + total
);
466 inode
->i_blocks
= (i_size_read(inode
) + 512 - 1) >> 9;
475 * v9fs_file_write - write to a file
476 * @filp: file pointer to write
477 * @data: data buffer to write data from
478 * @count: size of buffer
479 * @offset: offset at which to write data
483 v9fs_file_write(struct file
*filp
, const char __user
* data
,
484 size_t count
, loff_t
*offset
)
487 loff_t origin
= *offset
;
490 retval
= generic_write_checks(filp
, &origin
, &count
, 0);
495 if ((ssize_t
) count
< 0)
501 return v9fs_file_write_internal(filp
->f_path
.dentry
->d_inode
,
503 data
, count
, offset
, 1);
509 static int v9fs_file_fsync(struct file
*filp
, int datasync
)
512 struct p9_wstat wstat
;
515 P9_DPRINTK(P9_DEBUG_VFS
, "filp %p datasync %x\n", filp
, datasync
);
517 fid
= filp
->private_data
;
518 v9fs_blank_wstat(&wstat
);
520 retval
= p9_client_wstat(fid
, &wstat
);
524 int v9fs_file_fsync_dotl(struct file
*filp
, int datasync
)
529 P9_DPRINTK(P9_DEBUG_VFS
, "v9fs_file_fsync_dotl: filp %p datasync %x\n",
532 fid
= filp
->private_data
;
534 retval
= p9_client_fsync(fid
, datasync
);
539 v9fs_file_mmap(struct file
*file
, struct vm_area_struct
*vma
)
543 retval
= generic_file_mmap(file
, vma
);
545 vma
->vm_ops
= &v9fs_file_vm_ops
;
551 v9fs_vm_page_mkwrite(struct vm_area_struct
*vma
, struct vm_fault
*vmf
)
553 struct page
*page
= vmf
->page
;
554 struct file
*filp
= vma
->vm_file
;
555 struct inode
*inode
= filp
->f_path
.dentry
->d_inode
;
558 P9_DPRINTK(P9_DEBUG_VFS
, "page %p fid %lx\n",
559 page
, (unsigned long)filp
->private_data
);
561 /* make sure the cache has finished storing the page */
562 v9fs_fscache_wait_on_page_write(inode
, page
);
563 BUG_ON(!inode
->i_private
);
565 if (page
->mapping
!= inode
->i_mapping
)
568 return VM_FAULT_LOCKED
;
571 return VM_FAULT_NOPAGE
;
574 static const struct vm_operations_struct v9fs_file_vm_ops
= {
575 .fault
= filemap_fault
,
576 .page_mkwrite
= v9fs_vm_page_mkwrite
,
579 const struct file_operations v9fs_cached_file_operations
= {
580 .llseek
= generic_file_llseek
,
581 .read
= do_sync_read
,
582 .write
= do_sync_write
,
583 .aio_read
= generic_file_aio_read
,
584 .aio_write
= generic_file_aio_write
,
585 .open
= v9fs_file_open
,
586 .release
= v9fs_dir_release
,
587 .lock
= v9fs_file_lock
,
588 .mmap
= v9fs_file_mmap
,
589 .fsync
= v9fs_file_fsync
,
592 const struct file_operations v9fs_cached_file_operations_dotl
= {
593 .llseek
= generic_file_llseek
,
594 .read
= do_sync_read
,
595 .write
= do_sync_write
,
596 .aio_read
= generic_file_aio_read
,
597 .aio_write
= generic_file_aio_write
,
598 .open
= v9fs_file_open
,
599 .release
= v9fs_dir_release
,
600 .lock
= v9fs_file_lock_dotl
,
601 .flock
= v9fs_file_flock_dotl
,
602 .mmap
= v9fs_file_mmap
,
603 .fsync
= v9fs_file_fsync_dotl
,
606 const struct file_operations v9fs_file_operations
= {
607 .llseek
= generic_file_llseek
,
608 .read
= v9fs_file_read
,
609 .write
= v9fs_file_write
,
610 .open
= v9fs_file_open
,
611 .release
= v9fs_dir_release
,
612 .lock
= v9fs_file_lock
,
613 .mmap
= generic_file_readonly_mmap
,
614 .fsync
= v9fs_file_fsync
,
617 const struct file_operations v9fs_file_operations_dotl
= {
618 .llseek
= generic_file_llseek
,
619 .read
= v9fs_file_read
,
620 .write
= v9fs_file_write
,
621 .open
= v9fs_file_open
,
622 .release
= v9fs_dir_release
,
623 .lock
= v9fs_file_lock_dotl
,
624 .flock
= v9fs_file_flock_dotl
,
625 .mmap
= generic_file_readonly_mmap
,
626 .fsync
= v9fs_file_fsync_dotl
,