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Miklos Szeredib6aeade2005-09-09 13:10:30 -07001/*
2 FUSE: Filesystem in Userspace
Miklos Szeredi1729a162008-11-26 12:03:54 +01003 Copyright (C) 2001-2008 Miklos Szeredi <miklos@szeredi.hu>
Miklos Szeredib6aeade2005-09-09 13:10:30 -07004
5 This program can be distributed under the terms of the GNU GPL.
6 See the file COPYING.
7*/
8
9#include "fuse_i.h"
10
11#include <linux/pagemap.h>
12#include <linux/slab.h>
13#include <linux/kernel.h>
Alexey Dobriyane8edc6e2007-05-21 01:22:52 +040014#include <linux/sched.h>
Tejun Heo08cbf542009-04-14 10:54:53 +090015#include <linux/module.h>
Miklos Szeredib6aeade2005-09-09 13:10:30 -070016
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -080017static const struct file_operations fuse_direct_io_file_operations;
Miklos Szeredi45323fb2005-09-09 13:10:37 -070018
Miklos Szeredi91fe96b2009-04-28 16:56:37 +020019static int fuse_send_open(struct fuse_conn *fc, u64 nodeid, struct file *file,
20 int opcode, struct fuse_open_out *outargp)
Miklos Szeredib6aeade2005-09-09 13:10:30 -070021{
Miklos Szeredib6aeade2005-09-09 13:10:30 -070022 struct fuse_open_in inarg;
Miklos Szeredifd72faa2005-11-07 00:59:51 -080023 struct fuse_req *req;
24 int err;
25
Miklos Szeredice1d5a42006-04-10 22:54:58 -070026 req = fuse_get_req(fc);
27 if (IS_ERR(req))
28 return PTR_ERR(req);
Miklos Szeredifd72faa2005-11-07 00:59:51 -080029
30 memset(&inarg, 0, sizeof(inarg));
Miklos Szeredi6ff958e2007-10-18 03:07:02 -070031 inarg.flags = file->f_flags & ~(O_CREAT | O_EXCL | O_NOCTTY);
32 if (!fc->atomic_o_trunc)
33 inarg.flags &= ~O_TRUNC;
Miklos Szeredi91fe96b2009-04-28 16:56:37 +020034 req->in.h.opcode = opcode;
35 req->in.h.nodeid = nodeid;
Miklos Szeredifd72faa2005-11-07 00:59:51 -080036 req->in.numargs = 1;
37 req->in.args[0].size = sizeof(inarg);
38 req->in.args[0].value = &inarg;
39 req->out.numargs = 1;
40 req->out.args[0].size = sizeof(*outargp);
41 req->out.args[0].value = outargp;
Tejun Heob93f8582008-11-26 12:03:55 +010042 fuse_request_send(fc, req);
Miklos Szeredifd72faa2005-11-07 00:59:51 -080043 err = req->out.h.error;
44 fuse_put_request(fc, req);
45
46 return err;
47}
48
Tejun Heoacf99432008-11-26 12:03:55 +010049struct fuse_file *fuse_file_alloc(struct fuse_conn *fc)
Miklos Szeredifd72faa2005-11-07 00:59:51 -080050{
51 struct fuse_file *ff;
Tejun Heo6b2db282009-04-14 10:54:49 +090052
Miklos Szeredifd72faa2005-11-07 00:59:51 -080053 ff = kmalloc(sizeof(struct fuse_file), GFP_KERNEL);
Tejun Heo6b2db282009-04-14 10:54:49 +090054 if (unlikely(!ff))
55 return NULL;
56
Miklos Szeredida5e4712009-04-28 16:56:36 +020057 ff->fc = fc;
Tejun Heo6b2db282009-04-14 10:54:49 +090058 ff->reserved_req = fuse_request_alloc();
59 if (unlikely(!ff->reserved_req)) {
60 kfree(ff);
61 return NULL;
Miklos Szeredifd72faa2005-11-07 00:59:51 -080062 }
Tejun Heo6b2db282009-04-14 10:54:49 +090063
64 INIT_LIST_HEAD(&ff->write_entry);
65 atomic_set(&ff->count, 0);
66 RB_CLEAR_NODE(&ff->polled_node);
67 init_waitqueue_head(&ff->poll_wait);
68
69 spin_lock(&fc->lock);
70 ff->kh = ++fc->khctr;
71 spin_unlock(&fc->lock);
72
Miklos Szeredifd72faa2005-11-07 00:59:51 -080073 return ff;
74}
75
76void fuse_file_free(struct fuse_file *ff)
77{
Miklos Szeredi33649c92006-06-25 05:48:52 -070078 fuse_request_free(ff->reserved_req);
Miklos Szeredifd72faa2005-11-07 00:59:51 -080079 kfree(ff);
80}
81
Miklos Szeredic7b71432009-04-28 16:56:37 +020082struct fuse_file *fuse_file_get(struct fuse_file *ff)
Miklos Szeredic756e0a2007-10-16 23:31:00 -070083{
84 atomic_inc(&ff->count);
85 return ff;
86}
87
Miklos Szeredi819c4b32007-10-16 23:31:04 -070088static void fuse_release_end(struct fuse_conn *fc, struct fuse_req *req)
89{
Miklos Szeredib0be46e2009-04-28 16:56:36 +020090 path_put(&req->misc.release.path);
Miklos Szeredi819c4b32007-10-16 23:31:04 -070091}
92
Miklos Szeredic756e0a2007-10-16 23:31:00 -070093static void fuse_file_put(struct fuse_file *ff)
94{
95 if (atomic_dec_and_test(&ff->count)) {
96 struct fuse_req *req = ff->reserved_req;
Miklos Szeredi8b0797a2009-04-28 16:56:39 +020097
Miklos Szeredi819c4b32007-10-16 23:31:04 -070098 req->end = fuse_release_end;
Miklos Szeredi8b0797a2009-04-28 16:56:39 +020099 fuse_request_send_background(ff->fc, req);
Miklos Szeredic756e0a2007-10-16 23:31:00 -0700100 kfree(ff);
101 }
102}
103
Tejun Heo08cbf542009-04-14 10:54:53 +0900104int fuse_do_open(struct fuse_conn *fc, u64 nodeid, struct file *file,
105 bool isdir)
Miklos Szeredi91fe96b2009-04-28 16:56:37 +0200106{
107 struct fuse_open_out outarg;
108 struct fuse_file *ff;
109 int err;
110 int opcode = isdir ? FUSE_OPENDIR : FUSE_OPEN;
111
112 ff = fuse_file_alloc(fc);
113 if (!ff)
114 return -ENOMEM;
115
116 err = fuse_send_open(fc, nodeid, file, opcode, &outarg);
117 if (err) {
118 fuse_file_free(ff);
119 return err;
120 }
121
122 if (isdir)
123 outarg.open_flags &= ~FOPEN_DIRECT_IO;
124
125 ff->fh = outarg.fh;
126 ff->nodeid = nodeid;
127 ff->open_flags = outarg.open_flags;
128 file->private_data = fuse_file_get(ff);
129
130 return 0;
131}
Tejun Heo08cbf542009-04-14 10:54:53 +0900132EXPORT_SYMBOL_GPL(fuse_do_open);
Miklos Szeredi91fe96b2009-04-28 16:56:37 +0200133
Miklos Szeredic7b71432009-04-28 16:56:37 +0200134void fuse_finish_open(struct inode *inode, struct file *file)
Miklos Szeredifd72faa2005-11-07 00:59:51 -0800135{
Miklos Szeredic7b71432009-04-28 16:56:37 +0200136 struct fuse_file *ff = file->private_data;
137
138 if (ff->open_flags & FOPEN_DIRECT_IO)
Miklos Szeredifd72faa2005-11-07 00:59:51 -0800139 file->f_op = &fuse_direct_io_file_operations;
Miklos Szeredic7b71432009-04-28 16:56:37 +0200140 if (!(ff->open_flags & FOPEN_KEEP_CACHE))
Miklos Szeredib1009972007-10-16 23:31:01 -0700141 invalidate_inode_pages2(inode->i_mapping);
Miklos Szeredic7b71432009-04-28 16:56:37 +0200142 if (ff->open_flags & FOPEN_NONSEEKABLE)
Tejun Heoa7c1b992008-10-16 16:08:57 +0200143 nonseekable_open(inode, file);
Miklos Szeredifd72faa2005-11-07 00:59:51 -0800144}
145
Miklos Szeredi91fe96b2009-04-28 16:56:37 +0200146int fuse_open_common(struct inode *inode, struct file *file, bool isdir)
Miklos Szeredifd72faa2005-11-07 00:59:51 -0800147{
Tejun Heoacf99432008-11-26 12:03:55 +0100148 struct fuse_conn *fc = get_fuse_conn(inode);
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700149 int err;
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700150
Miklos Szeredidd190d02005-09-30 11:59:02 -0700151 /* VFS checks this, but only _after_ ->open() */
152 if (file->f_flags & O_DIRECT)
153 return -EINVAL;
154
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700155 err = generic_file_open(inode, file);
156 if (err)
157 return err;
158
Miklos Szeredi91fe96b2009-04-28 16:56:37 +0200159 err = fuse_do_open(fc, get_node_id(inode), file, isdir);
Miklos Szeredifd72faa2005-11-07 00:59:51 -0800160 if (err)
Miklos Szeredi91fe96b2009-04-28 16:56:37 +0200161 return err;
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700162
Miklos Szeredi91fe96b2009-04-28 16:56:37 +0200163 fuse_finish_open(inode, file);
164
165 return 0;
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700166}
167
Miklos Szeredi8b0797a2009-04-28 16:56:39 +0200168static void fuse_prepare_release(struct fuse_file *ff, int flags, int opcode)
Miklos Szeredi64c6d8e2006-01-16 22:14:42 -0800169{
Miklos Szeredi8b0797a2009-04-28 16:56:39 +0200170 struct fuse_conn *fc = ff->fc;
Miklos Szeredi33649c92006-06-25 05:48:52 -0700171 struct fuse_req *req = ff->reserved_req;
Miklos Szeredib57d4262008-02-06 01:38:39 -0800172 struct fuse_release_in *inarg = &req->misc.release.in;
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700173
Miklos Szeredi8b0797a2009-04-28 16:56:39 +0200174 spin_lock(&fc->lock);
175 list_del(&ff->write_entry);
176 if (!RB_EMPTY_NODE(&ff->polled_node))
177 rb_erase(&ff->polled_node, &fc->polled_files);
178 spin_unlock(&fc->lock);
179
180 wake_up_interruptible_sync(&ff->poll_wait);
181
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700182 inarg->fh = ff->fh;
Miklos Szeredifd72faa2005-11-07 00:59:51 -0800183 inarg->flags = flags;
Miklos Szeredi51eb01e2006-06-25 05:48:50 -0700184 req->in.h.opcode = opcode;
Miklos Szeredic7b71432009-04-28 16:56:37 +0200185 req->in.h.nodeid = ff->nodeid;
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700186 req->in.numargs = 1;
187 req->in.args[0].size = sizeof(struct fuse_release_in);
188 req->in.args[0].value = inarg;
Miklos Szeredifd72faa2005-11-07 00:59:51 -0800189}
190
Miklos Szeredi8b0797a2009-04-28 16:56:39 +0200191void fuse_release_common(struct file *file, int opcode)
Miklos Szeredifd72faa2005-11-07 00:59:51 -0800192{
Tejun Heo6b2db282009-04-14 10:54:49 +0900193 struct fuse_file *ff;
194 struct fuse_req *req;
Miklos Szeredi93a8c3c2007-10-18 03:07:03 -0700195
Tejun Heo6b2db282009-04-14 10:54:49 +0900196 ff = file->private_data;
197 if (unlikely(!ff))
Miklos Szeredi8b0797a2009-04-28 16:56:39 +0200198 return;
Miklos Szeredi51eb01e2006-06-25 05:48:50 -0700199
Tejun Heo6b2db282009-04-14 10:54:49 +0900200 req = ff->reserved_req;
Miklos Szeredi8b0797a2009-04-28 16:56:39 +0200201 fuse_prepare_release(ff, file->f_flags, opcode);
Tejun Heo95668a62008-11-26 12:03:55 +0100202
Tejun Heo6b2db282009-04-14 10:54:49 +0900203 /* Hold vfsmount and dentry until release is finished */
Miklos Szeredib0be46e2009-04-28 16:56:36 +0200204 path_get(&file->f_path);
205 req->misc.release.path = file->f_path;
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700206
Tejun Heo6b2db282009-04-14 10:54:49 +0900207 /*
208 * Normally this will send the RELEASE request, however if
209 * some asynchronous READ or WRITE requests are outstanding,
210 * the sending will be delayed.
211 */
212 fuse_file_put(ff);
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700213}
214
Miklos Szeredi04730fe2005-09-09 13:10:36 -0700215static int fuse_open(struct inode *inode, struct file *file)
216{
Miklos Szeredi91fe96b2009-04-28 16:56:37 +0200217 return fuse_open_common(inode, file, false);
Miklos Szeredi04730fe2005-09-09 13:10:36 -0700218}
219
220static int fuse_release(struct inode *inode, struct file *file)
221{
Miklos Szeredi8b0797a2009-04-28 16:56:39 +0200222 fuse_release_common(file, FUSE_RELEASE);
223
224 /* return value is ignored by VFS */
225 return 0;
226}
227
228void fuse_sync_release(struct fuse_file *ff, int flags)
229{
230 WARN_ON(atomic_read(&ff->count) > 1);
231 fuse_prepare_release(ff, flags, FUSE_RELEASE);
232 ff->reserved_req->force = 1;
233 fuse_request_send(ff->fc, ff->reserved_req);
234 fuse_put_request(ff->fc, ff->reserved_req);
235 kfree(ff);
Miklos Szeredi04730fe2005-09-09 13:10:36 -0700236}
Tejun Heo08cbf542009-04-14 10:54:53 +0900237EXPORT_SYMBOL_GPL(fuse_sync_release);
Miklos Szeredi04730fe2005-09-09 13:10:36 -0700238
Miklos Szeredi71421252006-06-25 05:48:52 -0700239/*
Miklos Szeredi9c8ef562006-06-25 05:48:55 -0700240 * Scramble the ID space with XTEA, so that the value of the files_struct
241 * pointer is not exposed to userspace.
Miklos Szeredi71421252006-06-25 05:48:52 -0700242 */
Miklos Szeredif3332112007-10-18 03:07:04 -0700243u64 fuse_lock_owner_id(struct fuse_conn *fc, fl_owner_t id)
Miklos Szeredi71421252006-06-25 05:48:52 -0700244{
Miklos Szeredi9c8ef562006-06-25 05:48:55 -0700245 u32 *k = fc->scramble_key;
246 u64 v = (unsigned long) id;
247 u32 v0 = v;
248 u32 v1 = v >> 32;
249 u32 sum = 0;
250 int i;
251
252 for (i = 0; i < 32; i++) {
253 v0 += ((v1 << 4 ^ v1 >> 5) + v1) ^ (sum + k[sum & 3]);
254 sum += 0x9E3779B9;
255 v1 += ((v0 << 4 ^ v0 >> 5) + v0) ^ (sum + k[sum>>11 & 3]);
256 }
257
258 return (u64) v0 + ((u64) v1 << 32);
Miklos Szeredi71421252006-06-25 05:48:52 -0700259}
260
Miklos Szeredi3be5a522008-04-30 00:54:41 -0700261/*
262 * Check if page is under writeback
263 *
264 * This is currently done by walking the list of writepage requests
265 * for the inode, which can be pretty inefficient.
266 */
267static bool fuse_page_is_writeback(struct inode *inode, pgoff_t index)
268{
269 struct fuse_conn *fc = get_fuse_conn(inode);
270 struct fuse_inode *fi = get_fuse_inode(inode);
271 struct fuse_req *req;
272 bool found = false;
273
274 spin_lock(&fc->lock);
275 list_for_each_entry(req, &fi->writepages, writepages_entry) {
276 pgoff_t curr_index;
277
278 BUG_ON(req->inode != inode);
279 curr_index = req->misc.write.in.offset >> PAGE_CACHE_SHIFT;
280 if (curr_index == index) {
281 found = true;
282 break;
283 }
284 }
285 spin_unlock(&fc->lock);
286
287 return found;
288}
289
290/*
291 * Wait for page writeback to be completed.
292 *
293 * Since fuse doesn't rely on the VM writeback tracking, this has to
294 * use some other means.
295 */
296static int fuse_wait_on_page_writeback(struct inode *inode, pgoff_t index)
297{
298 struct fuse_inode *fi = get_fuse_inode(inode);
299
300 wait_event(fi->page_waitq, !fuse_page_is_writeback(inode, index));
301 return 0;
302}
303
Miklos Szeredi75e1fcc2006-06-23 02:05:12 -0700304static int fuse_flush(struct file *file, fl_owner_t id)
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700305{
Josef Sipek7706a9d2006-12-08 02:37:02 -0800306 struct inode *inode = file->f_path.dentry->d_inode;
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700307 struct fuse_conn *fc = get_fuse_conn(inode);
308 struct fuse_file *ff = file->private_data;
309 struct fuse_req *req;
310 struct fuse_flush_in inarg;
311 int err;
312
Miklos Szeredi248d86e2006-01-06 00:19:39 -0800313 if (is_bad_inode(inode))
314 return -EIO;
315
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700316 if (fc->no_flush)
317 return 0;
318
Miklos Szeredi33649c92006-06-25 05:48:52 -0700319 req = fuse_get_req_nofail(fc, file);
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700320 memset(&inarg, 0, sizeof(inarg));
321 inarg.fh = ff->fh;
Miklos Szeredi9c8ef562006-06-25 05:48:55 -0700322 inarg.lock_owner = fuse_lock_owner_id(fc, id);
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700323 req->in.h.opcode = FUSE_FLUSH;
324 req->in.h.nodeid = get_node_id(inode);
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700325 req->in.numargs = 1;
326 req->in.args[0].size = sizeof(inarg);
327 req->in.args[0].value = &inarg;
Miklos Szeredi71421252006-06-25 05:48:52 -0700328 req->force = 1;
Tejun Heob93f8582008-11-26 12:03:55 +0100329 fuse_request_send(fc, req);
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700330 err = req->out.h.error;
331 fuse_put_request(fc, req);
332 if (err == -ENOSYS) {
333 fc->no_flush = 1;
334 err = 0;
335 }
336 return err;
337}
338
Miklos Szeredi3be5a522008-04-30 00:54:41 -0700339/*
340 * Wait for all pending writepages on the inode to finish.
341 *
342 * This is currently done by blocking further writes with FUSE_NOWRITE
343 * and waiting for all sent writes to complete.
344 *
345 * This must be called under i_mutex, otherwise the FUSE_NOWRITE usage
346 * could conflict with truncation.
347 */
348static void fuse_sync_writes(struct inode *inode)
349{
350 fuse_set_nowrite(inode);
351 fuse_release_nowrite(inode);
352}
353
Christoph Hellwig7ea80852010-05-26 17:53:25 +0200354int fuse_fsync_common(struct file *file, int datasync, int isdir)
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700355{
Christoph Hellwig7ea80852010-05-26 17:53:25 +0200356 struct inode *inode = file->f_mapping->host;
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700357 struct fuse_conn *fc = get_fuse_conn(inode);
358 struct fuse_file *ff = file->private_data;
359 struct fuse_req *req;
360 struct fuse_fsync_in inarg;
361 int err;
362
Miklos Szeredi248d86e2006-01-06 00:19:39 -0800363 if (is_bad_inode(inode))
364 return -EIO;
365
Miklos Szeredi82547982005-09-09 13:10:38 -0700366 if ((!isdir && fc->no_fsync) || (isdir && fc->no_fsyncdir))
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700367 return 0;
368
Miklos Szeredi3be5a522008-04-30 00:54:41 -0700369 /*
370 * Start writeback against all dirty pages of the inode, then
371 * wait for all outstanding writes, before sending the FSYNC
372 * request.
373 */
374 err = write_inode_now(inode, 0);
375 if (err)
376 return err;
377
378 fuse_sync_writes(inode);
379
Miklos Szeredice1d5a42006-04-10 22:54:58 -0700380 req = fuse_get_req(fc);
381 if (IS_ERR(req))
382 return PTR_ERR(req);
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700383
384 memset(&inarg, 0, sizeof(inarg));
385 inarg.fh = ff->fh;
386 inarg.fsync_flags = datasync ? 1 : 0;
Miklos Szeredi82547982005-09-09 13:10:38 -0700387 req->in.h.opcode = isdir ? FUSE_FSYNCDIR : FUSE_FSYNC;
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700388 req->in.h.nodeid = get_node_id(inode);
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700389 req->in.numargs = 1;
390 req->in.args[0].size = sizeof(inarg);
391 req->in.args[0].value = &inarg;
Tejun Heob93f8582008-11-26 12:03:55 +0100392 fuse_request_send(fc, req);
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700393 err = req->out.h.error;
394 fuse_put_request(fc, req);
395 if (err == -ENOSYS) {
Miklos Szeredi82547982005-09-09 13:10:38 -0700396 if (isdir)
397 fc->no_fsyncdir = 1;
398 else
399 fc->no_fsync = 1;
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700400 err = 0;
401 }
402 return err;
403}
404
Christoph Hellwig7ea80852010-05-26 17:53:25 +0200405static int fuse_fsync(struct file *file, int datasync)
Miklos Szeredi82547982005-09-09 13:10:38 -0700406{
Christoph Hellwig7ea80852010-05-26 17:53:25 +0200407 return fuse_fsync_common(file, datasync, 0);
Miklos Szeredi82547982005-09-09 13:10:38 -0700408}
409
Miklos Szeredi2106cb12009-04-28 16:56:37 +0200410void fuse_read_fill(struct fuse_req *req, struct file *file, loff_t pos,
411 size_t count, int opcode)
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700412{
Miklos Szeredi5c5c5e52008-04-30 00:54:43 -0700413 struct fuse_read_in *inarg = &req->misc.read.in;
Miklos Szeredia6643092007-11-28 16:22:00 -0800414 struct fuse_file *ff = file->private_data;
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700415
Miklos Szeredi361b1eb52006-01-16 22:14:45 -0800416 inarg->fh = ff->fh;
417 inarg->offset = pos;
418 inarg->size = count;
Miklos Szeredia6643092007-11-28 16:22:00 -0800419 inarg->flags = file->f_flags;
Miklos Szeredi361b1eb52006-01-16 22:14:45 -0800420 req->in.h.opcode = opcode;
Miklos Szeredi2106cb12009-04-28 16:56:37 +0200421 req->in.h.nodeid = ff->nodeid;
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700422 req->in.numargs = 1;
423 req->in.args[0].size = sizeof(struct fuse_read_in);
Miklos Szeredic1aa96a2006-01-16 22:14:46 -0800424 req->in.args[0].value = inarg;
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700425 req->out.argvar = 1;
426 req->out.numargs = 1;
427 req->out.args[0].size = count;
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700428}
429
Miklos Szeredi8bfc0162006-01-16 22:14:28 -0800430static size_t fuse_send_read(struct fuse_req *req, struct file *file,
Miklos Szeredi2106cb12009-04-28 16:56:37 +0200431 loff_t pos, size_t count, fl_owner_t owner)
Miklos Szeredi04730fe2005-09-09 13:10:36 -0700432{
Miklos Szeredi2106cb12009-04-28 16:56:37 +0200433 struct fuse_file *ff = file->private_data;
434 struct fuse_conn *fc = ff->fc;
Miklos Szeredif3332112007-10-18 03:07:04 -0700435
Miklos Szeredi2106cb12009-04-28 16:56:37 +0200436 fuse_read_fill(req, file, pos, count, FUSE_READ);
Miklos Szeredif3332112007-10-18 03:07:04 -0700437 if (owner != NULL) {
Miklos Szeredi5c5c5e52008-04-30 00:54:43 -0700438 struct fuse_read_in *inarg = &req->misc.read.in;
Miklos Szeredif3332112007-10-18 03:07:04 -0700439
440 inarg->read_flags |= FUSE_READ_LOCKOWNER;
441 inarg->lock_owner = fuse_lock_owner_id(fc, owner);
442 }
Tejun Heob93f8582008-11-26 12:03:55 +0100443 fuse_request_send(fc, req);
Miklos Szeredi361b1eb52006-01-16 22:14:45 -0800444 return req->out.args[0].size;
Miklos Szeredi04730fe2005-09-09 13:10:36 -0700445}
446
Miklos Szeredi5c5c5e52008-04-30 00:54:43 -0700447static void fuse_read_update_size(struct inode *inode, loff_t size,
448 u64 attr_ver)
449{
450 struct fuse_conn *fc = get_fuse_conn(inode);
451 struct fuse_inode *fi = get_fuse_inode(inode);
452
453 spin_lock(&fc->lock);
454 if (attr_ver == fi->attr_version && size < inode->i_size) {
455 fi->attr_version = ++fc->attr_version;
456 i_size_write(inode, size);
457 }
458 spin_unlock(&fc->lock);
459}
460
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700461static int fuse_readpage(struct file *file, struct page *page)
462{
463 struct inode *inode = page->mapping->host;
464 struct fuse_conn *fc = get_fuse_conn(inode);
Miklos Szeredi248d86e2006-01-06 00:19:39 -0800465 struct fuse_req *req;
Miklos Szeredi5c5c5e52008-04-30 00:54:43 -0700466 size_t num_read;
467 loff_t pos = page_offset(page);
468 size_t count = PAGE_CACHE_SIZE;
469 u64 attr_ver;
Miklos Szeredi248d86e2006-01-06 00:19:39 -0800470 int err;
471
472 err = -EIO;
473 if (is_bad_inode(inode))
474 goto out;
475
Miklos Szeredi3be5a522008-04-30 00:54:41 -0700476 /*
477 * Page writeback can extend beyond the liftime of the
478 * page-cache page, so make sure we read a properly synced
479 * page.
480 */
481 fuse_wait_on_page_writeback(inode, page->index);
482
Miklos Szeredice1d5a42006-04-10 22:54:58 -0700483 req = fuse_get_req(fc);
484 err = PTR_ERR(req);
485 if (IS_ERR(req))
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700486 goto out;
487
Miklos Szeredi5c5c5e52008-04-30 00:54:43 -0700488 attr_ver = fuse_get_attr_version(fc);
489
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700490 req->out.page_zeroing = 1;
Miklos Szeredif4975c62009-04-02 14:25:34 +0200491 req->out.argpages = 1;
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700492 req->num_pages = 1;
493 req->pages[0] = page;
Miklos Szeredi2106cb12009-04-28 16:56:37 +0200494 num_read = fuse_send_read(req, file, pos, count, NULL);
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700495 err = req->out.h.error;
496 fuse_put_request(fc, req);
Miklos Szeredi5c5c5e52008-04-30 00:54:43 -0700497
498 if (!err) {
499 /*
500 * Short read means EOF. If file size is larger, truncate it
501 */
502 if (num_read < count)
503 fuse_read_update_size(inode, pos + num_read, attr_ver);
504
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700505 SetPageUptodate(page);
Miklos Szeredi5c5c5e52008-04-30 00:54:43 -0700506 }
507
Miklos Szeredib36c31b2005-09-09 13:10:38 -0700508 fuse_invalidate_attr(inode); /* atime changed */
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700509 out:
510 unlock_page(page);
511 return err;
512}
513
Miklos Szeredic1aa96a2006-01-16 22:14:46 -0800514static void fuse_readpages_end(struct fuse_conn *fc, struct fuse_req *req)
Miklos Szeredidb50b962005-09-09 13:10:33 -0700515{
Miklos Szeredic1aa96a2006-01-16 22:14:46 -0800516 int i;
Miklos Szeredi5c5c5e52008-04-30 00:54:43 -0700517 size_t count = req->misc.read.in.size;
518 size_t num_read = req->out.args[0].size;
Miklos Szeredice534fb2010-05-25 15:06:07 +0200519 struct address_space *mapping = NULL;
Miklos Szeredic1aa96a2006-01-16 22:14:46 -0800520
Miklos Szeredice534fb2010-05-25 15:06:07 +0200521 for (i = 0; mapping == NULL && i < req->num_pages; i++)
522 mapping = req->pages[i]->mapping;
523
524 if (mapping) {
525 struct inode *inode = mapping->host;
526
527 /*
528 * Short read means EOF. If file size is larger, truncate it
529 */
530 if (!req->out.h.error && num_read < count) {
531 loff_t pos;
532
533 pos = page_offset(req->pages[0]) + num_read;
534 fuse_read_update_size(inode, pos,
535 req->misc.read.attr_ver);
536 }
537 fuse_invalidate_attr(inode); /* atime changed */
Miklos Szeredi5c5c5e52008-04-30 00:54:43 -0700538 }
539
Miklos Szeredidb50b962005-09-09 13:10:33 -0700540 for (i = 0; i < req->num_pages; i++) {
541 struct page *page = req->pages[i];
542 if (!req->out.h.error)
543 SetPageUptodate(page);
Miklos Szeredic1aa96a2006-01-16 22:14:46 -0800544 else
545 SetPageError(page);
Miklos Szeredidb50b962005-09-09 13:10:33 -0700546 unlock_page(page);
Miklos Szeredib5dd3282010-05-25 15:06:06 +0200547 page_cache_release(page);
Miklos Szeredidb50b962005-09-09 13:10:33 -0700548 }
Miklos Szeredic756e0a2007-10-16 23:31:00 -0700549 if (req->ff)
550 fuse_file_put(req->ff);
Miklos Szeredic1aa96a2006-01-16 22:14:46 -0800551}
552
Miklos Szeredi2106cb12009-04-28 16:56:37 +0200553static void fuse_send_readpages(struct fuse_req *req, struct file *file)
Miklos Szeredic1aa96a2006-01-16 22:14:46 -0800554{
Miklos Szeredi2106cb12009-04-28 16:56:37 +0200555 struct fuse_file *ff = file->private_data;
556 struct fuse_conn *fc = ff->fc;
Miklos Szeredic1aa96a2006-01-16 22:14:46 -0800557 loff_t pos = page_offset(req->pages[0]);
558 size_t count = req->num_pages << PAGE_CACHE_SHIFT;
Miklos Szeredif4975c62009-04-02 14:25:34 +0200559
560 req->out.argpages = 1;
Miklos Szeredic1aa96a2006-01-16 22:14:46 -0800561 req->out.page_zeroing = 1;
Miklos Szeredice534fb2010-05-25 15:06:07 +0200562 req->out.page_replace = 1;
Miklos Szeredi2106cb12009-04-28 16:56:37 +0200563 fuse_read_fill(req, file, pos, count, FUSE_READ);
Miklos Szeredi5c5c5e52008-04-30 00:54:43 -0700564 req->misc.read.attr_ver = fuse_get_attr_version(fc);
Miklos Szeredi9cd68452006-02-01 03:04:40 -0800565 if (fc->async_read) {
Miklos Szeredic756e0a2007-10-16 23:31:00 -0700566 req->ff = fuse_file_get(ff);
Miklos Szeredi9cd68452006-02-01 03:04:40 -0800567 req->end = fuse_readpages_end;
Tejun Heob93f8582008-11-26 12:03:55 +0100568 fuse_request_send_background(fc, req);
Miklos Szeredi9cd68452006-02-01 03:04:40 -0800569 } else {
Tejun Heob93f8582008-11-26 12:03:55 +0100570 fuse_request_send(fc, req);
Miklos Szeredi9cd68452006-02-01 03:04:40 -0800571 fuse_readpages_end(fc, req);
Tejun Heoe9bb09d2008-11-26 12:03:54 +0100572 fuse_put_request(fc, req);
Miklos Szeredi9cd68452006-02-01 03:04:40 -0800573 }
Miklos Szeredidb50b962005-09-09 13:10:33 -0700574}
575
Miklos Szeredic756e0a2007-10-16 23:31:00 -0700576struct fuse_fill_data {
Miklos Szeredidb50b962005-09-09 13:10:33 -0700577 struct fuse_req *req;
Miklos Szeredia6643092007-11-28 16:22:00 -0800578 struct file *file;
Miklos Szeredidb50b962005-09-09 13:10:33 -0700579 struct inode *inode;
580};
581
582static int fuse_readpages_fill(void *_data, struct page *page)
583{
Miklos Szeredic756e0a2007-10-16 23:31:00 -0700584 struct fuse_fill_data *data = _data;
Miklos Szeredidb50b962005-09-09 13:10:33 -0700585 struct fuse_req *req = data->req;
586 struct inode *inode = data->inode;
587 struct fuse_conn *fc = get_fuse_conn(inode);
588
Miklos Szeredi3be5a522008-04-30 00:54:41 -0700589 fuse_wait_on_page_writeback(inode, page->index);
590
Miklos Szeredidb50b962005-09-09 13:10:33 -0700591 if (req->num_pages &&
592 (req->num_pages == FUSE_MAX_PAGES_PER_REQ ||
593 (req->num_pages + 1) * PAGE_CACHE_SIZE > fc->max_read ||
594 req->pages[req->num_pages - 1]->index + 1 != page->index)) {
Miklos Szeredi2106cb12009-04-28 16:56:37 +0200595 fuse_send_readpages(req, data->file);
Miklos Szeredice1d5a42006-04-10 22:54:58 -0700596 data->req = req = fuse_get_req(fc);
597 if (IS_ERR(req)) {
Miklos Szeredidb50b962005-09-09 13:10:33 -0700598 unlock_page(page);
Miklos Szeredice1d5a42006-04-10 22:54:58 -0700599 return PTR_ERR(req);
Miklos Szeredidb50b962005-09-09 13:10:33 -0700600 }
Miklos Szeredidb50b962005-09-09 13:10:33 -0700601 }
Miklos Szeredib5dd3282010-05-25 15:06:06 +0200602 page_cache_get(page);
Miklos Szeredidb50b962005-09-09 13:10:33 -0700603 req->pages[req->num_pages] = page;
Miklos Szeredi1729a162008-11-26 12:03:54 +0100604 req->num_pages++;
Miklos Szeredidb50b962005-09-09 13:10:33 -0700605 return 0;
606}
607
608static int fuse_readpages(struct file *file, struct address_space *mapping,
609 struct list_head *pages, unsigned nr_pages)
610{
611 struct inode *inode = mapping->host;
612 struct fuse_conn *fc = get_fuse_conn(inode);
Miklos Szeredic756e0a2007-10-16 23:31:00 -0700613 struct fuse_fill_data data;
Miklos Szeredidb50b962005-09-09 13:10:33 -0700614 int err;
Miklos Szeredi248d86e2006-01-06 00:19:39 -0800615
Alexander Zarochentsev1d7ea732006-08-13 23:24:27 -0700616 err = -EIO;
Miklos Szeredi248d86e2006-01-06 00:19:39 -0800617 if (is_bad_inode(inode))
OGAWA Hirofumi2e990022006-11-02 22:07:09 -0800618 goto out;
Miklos Szeredi248d86e2006-01-06 00:19:39 -0800619
Miklos Szeredia6643092007-11-28 16:22:00 -0800620 data.file = file;
Miklos Szeredidb50b962005-09-09 13:10:33 -0700621 data.inode = inode;
Miklos Szeredice1d5a42006-04-10 22:54:58 -0700622 data.req = fuse_get_req(fc);
Alexander Zarochentsev1d7ea732006-08-13 23:24:27 -0700623 err = PTR_ERR(data.req);
Miklos Szeredice1d5a42006-04-10 22:54:58 -0700624 if (IS_ERR(data.req))
OGAWA Hirofumi2e990022006-11-02 22:07:09 -0800625 goto out;
Miklos Szeredidb50b962005-09-09 13:10:33 -0700626
627 err = read_cache_pages(mapping, pages, fuse_readpages_fill, &data);
Miklos Szeredid3406ff2006-04-10 22:54:49 -0700628 if (!err) {
629 if (data.req->num_pages)
Miklos Szeredi2106cb12009-04-28 16:56:37 +0200630 fuse_send_readpages(data.req, file);
Miklos Szeredid3406ff2006-04-10 22:54:49 -0700631 else
632 fuse_put_request(fc, data.req);
633 }
OGAWA Hirofumi2e990022006-11-02 22:07:09 -0800634out:
Alexander Zarochentsev1d7ea732006-08-13 23:24:27 -0700635 return err;
Miklos Szeredidb50b962005-09-09 13:10:33 -0700636}
637
Miklos Szeredibcb4be82007-11-28 16:21:59 -0800638static ssize_t fuse_file_aio_read(struct kiocb *iocb, const struct iovec *iov,
639 unsigned long nr_segs, loff_t pos)
640{
641 struct inode *inode = iocb->ki_filp->f_mapping->host;
642
643 if (pos + iov_length(iov, nr_segs) > i_size_read(inode)) {
644 int err;
645 /*
646 * If trying to read past EOF, make sure the i_size
647 * attribute is up-to-date.
648 */
649 err = fuse_update_attributes(inode, NULL, iocb->ki_filp, NULL);
650 if (err)
651 return err;
652 }
653
654 return generic_file_aio_read(iocb, iov, nr_segs, pos);
655}
656
Miklos Szeredi2d698b02009-04-28 16:56:36 +0200657static void fuse_write_fill(struct fuse_req *req, struct fuse_file *ff,
Miklos Szeredi2106cb12009-04-28 16:56:37 +0200658 loff_t pos, size_t count)
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700659{
Miklos Szeredib25e82e2007-10-18 03:07:03 -0700660 struct fuse_write_in *inarg = &req->misc.write.in;
661 struct fuse_write_out *outarg = &req->misc.write.out;
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700662
Miklos Szeredib25e82e2007-10-18 03:07:03 -0700663 inarg->fh = ff->fh;
664 inarg->offset = pos;
665 inarg->size = count;
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700666 req->in.h.opcode = FUSE_WRITE;
Miklos Szeredi2106cb12009-04-28 16:56:37 +0200667 req->in.h.nodeid = ff->nodeid;
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700668 req->in.numargs = 2;
Miklos Szeredi2106cb12009-04-28 16:56:37 +0200669 if (ff->fc->minor < 9)
Miklos Szeredif3332112007-10-18 03:07:04 -0700670 req->in.args[0].size = FUSE_COMPAT_WRITE_IN_SIZE;
671 else
672 req->in.args[0].size = sizeof(struct fuse_write_in);
Miklos Szeredib25e82e2007-10-18 03:07:03 -0700673 req->in.args[0].value = inarg;
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700674 req->in.args[1].size = count;
675 req->out.numargs = 1;
676 req->out.args[0].size = sizeof(struct fuse_write_out);
Miklos Szeredib25e82e2007-10-18 03:07:03 -0700677 req->out.args[0].value = outarg;
678}
679
680static size_t fuse_send_write(struct fuse_req *req, struct file *file,
Miklos Szeredi2106cb12009-04-28 16:56:37 +0200681 loff_t pos, size_t count, fl_owner_t owner)
Miklos Szeredib25e82e2007-10-18 03:07:03 -0700682{
Miklos Szeredi2106cb12009-04-28 16:56:37 +0200683 struct fuse_file *ff = file->private_data;
684 struct fuse_conn *fc = ff->fc;
Miklos Szeredi2d698b02009-04-28 16:56:36 +0200685 struct fuse_write_in *inarg = &req->misc.write.in;
686
Miklos Szeredi2106cb12009-04-28 16:56:37 +0200687 fuse_write_fill(req, ff, pos, count);
Miklos Szeredi2d698b02009-04-28 16:56:36 +0200688 inarg->flags = file->f_flags;
Miklos Szeredif3332112007-10-18 03:07:04 -0700689 if (owner != NULL) {
Miklos Szeredif3332112007-10-18 03:07:04 -0700690 inarg->write_flags |= FUSE_WRITE_LOCKOWNER;
691 inarg->lock_owner = fuse_lock_owner_id(fc, owner);
692 }
Tejun Heob93f8582008-11-26 12:03:55 +0100693 fuse_request_send(fc, req);
Miklos Szeredib25e82e2007-10-18 03:07:03 -0700694 return req->misc.write.out.size;
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700695}
696
Nick Piggin5e6f58a2007-10-16 01:25:17 -0700697static int fuse_write_begin(struct file *file, struct address_space *mapping,
698 loff_t pos, unsigned len, unsigned flags,
699 struct page **pagep, void **fsdata)
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700700{
Nick Piggin5e6f58a2007-10-16 01:25:17 -0700701 pgoff_t index = pos >> PAGE_CACHE_SHIFT;
702
Nick Piggin54566b22009-01-04 12:00:53 -0800703 *pagep = grab_cache_page_write_begin(mapping, index, flags);
Nick Piggin5e6f58a2007-10-16 01:25:17 -0700704 if (!*pagep)
705 return -ENOMEM;
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700706 return 0;
707}
708
Miklos Szeredia1d75f22010-07-12 14:41:40 +0200709void fuse_write_update_size(struct inode *inode, loff_t pos)
Miklos Szeredi854512e2008-04-30 00:54:41 -0700710{
711 struct fuse_conn *fc = get_fuse_conn(inode);
712 struct fuse_inode *fi = get_fuse_inode(inode);
713
714 spin_lock(&fc->lock);
715 fi->attr_version = ++fc->attr_version;
716 if (pos > inode->i_size)
717 i_size_write(inode, pos);
718 spin_unlock(&fc->lock);
719}
720
Nick Piggin5e6f58a2007-10-16 01:25:17 -0700721static int fuse_buffered_write(struct file *file, struct inode *inode,
722 loff_t pos, unsigned count, struct page *page)
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700723{
724 int err;
Miklos Szeredi04730fe2005-09-09 13:10:36 -0700725 size_t nres;
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700726 struct fuse_conn *fc = get_fuse_conn(inode);
Nick Piggin5e6f58a2007-10-16 01:25:17 -0700727 unsigned offset = pos & (PAGE_CACHE_SIZE - 1);
Miklos Szeredi248d86e2006-01-06 00:19:39 -0800728 struct fuse_req *req;
729
730 if (is_bad_inode(inode))
731 return -EIO;
732
Miklos Szeredi3be5a522008-04-30 00:54:41 -0700733 /*
734 * Make sure writepages on the same page are not mixed up with
735 * plain writes.
736 */
737 fuse_wait_on_page_writeback(inode, page->index);
738
Miklos Szeredice1d5a42006-04-10 22:54:58 -0700739 req = fuse_get_req(fc);
740 if (IS_ERR(req))
741 return PTR_ERR(req);
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700742
Miklos Szeredif4975c62009-04-02 14:25:34 +0200743 req->in.argpages = 1;
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700744 req->num_pages = 1;
745 req->pages[0] = page;
746 req->page_offset = offset;
Miklos Szeredi2106cb12009-04-28 16:56:37 +0200747 nres = fuse_send_write(req, file, pos, count, NULL);
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700748 err = req->out.h.error;
749 fuse_put_request(fc, req);
Nick Piggin5e6f58a2007-10-16 01:25:17 -0700750 if (!err && !nres)
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700751 err = -EIO;
752 if (!err) {
Nick Piggin5e6f58a2007-10-16 01:25:17 -0700753 pos += nres;
Miklos Szeredi854512e2008-04-30 00:54:41 -0700754 fuse_write_update_size(inode, pos);
Nick Piggin5e6f58a2007-10-16 01:25:17 -0700755 if (count == PAGE_CACHE_SIZE)
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700756 SetPageUptodate(page);
Miklos Szeredib36c31b2005-09-09 13:10:38 -0700757 }
758 fuse_invalidate_attr(inode);
Nick Piggin5e6f58a2007-10-16 01:25:17 -0700759 return err ? err : nres;
760}
761
762static int fuse_write_end(struct file *file, struct address_space *mapping,
763 loff_t pos, unsigned len, unsigned copied,
764 struct page *page, void *fsdata)
765{
766 struct inode *inode = mapping->host;
767 int res = 0;
768
769 if (copied)
770 res = fuse_buffered_write(file, inode, pos, copied, page);
771
772 unlock_page(page);
773 page_cache_release(page);
774 return res;
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700775}
776
Nick Pigginea9b9902008-04-30 00:54:42 -0700777static size_t fuse_send_write_pages(struct fuse_req *req, struct file *file,
778 struct inode *inode, loff_t pos,
779 size_t count)
780{
781 size_t res;
782 unsigned offset;
783 unsigned i;
784
785 for (i = 0; i < req->num_pages; i++)
786 fuse_wait_on_page_writeback(inode, req->pages[i]->index);
787
Miklos Szeredi2106cb12009-04-28 16:56:37 +0200788 res = fuse_send_write(req, file, pos, count, NULL);
Nick Pigginea9b9902008-04-30 00:54:42 -0700789
790 offset = req->page_offset;
791 count = res;
792 for (i = 0; i < req->num_pages; i++) {
793 struct page *page = req->pages[i];
794
795 if (!req->out.h.error && !offset && count >= PAGE_CACHE_SIZE)
796 SetPageUptodate(page);
797
798 if (count > PAGE_CACHE_SIZE - offset)
799 count -= PAGE_CACHE_SIZE - offset;
800 else
801 count = 0;
802 offset = 0;
803
804 unlock_page(page);
805 page_cache_release(page);
806 }
807
808 return res;
809}
810
811static ssize_t fuse_fill_write_pages(struct fuse_req *req,
812 struct address_space *mapping,
813 struct iov_iter *ii, loff_t pos)
814{
815 struct fuse_conn *fc = get_fuse_conn(mapping->host);
816 unsigned offset = pos & (PAGE_CACHE_SIZE - 1);
817 size_t count = 0;
818 int err;
819
Miklos Szeredif4975c62009-04-02 14:25:34 +0200820 req->in.argpages = 1;
Nick Pigginea9b9902008-04-30 00:54:42 -0700821 req->page_offset = offset;
822
823 do {
824 size_t tmp;
825 struct page *page;
826 pgoff_t index = pos >> PAGE_CACHE_SHIFT;
827 size_t bytes = min_t(size_t, PAGE_CACHE_SIZE - offset,
828 iov_iter_count(ii));
829
830 bytes = min_t(size_t, bytes, fc->max_write - count);
831
832 again:
833 err = -EFAULT;
834 if (iov_iter_fault_in_readable(ii, bytes))
835 break;
836
837 err = -ENOMEM;
Nick Piggin54566b22009-01-04 12:00:53 -0800838 page = grab_cache_page_write_begin(mapping, index, 0);
Nick Pigginea9b9902008-04-30 00:54:42 -0700839 if (!page)
840 break;
841
anfei zhou931e80e2010-02-02 13:44:02 -0800842 if (mapping_writably_mapped(mapping))
843 flush_dcache_page(page);
844
Nick Pigginea9b9902008-04-30 00:54:42 -0700845 pagefault_disable();
846 tmp = iov_iter_copy_from_user_atomic(page, ii, offset, bytes);
847 pagefault_enable();
848 flush_dcache_page(page);
849
850 if (!tmp) {
851 unlock_page(page);
852 page_cache_release(page);
853 bytes = min(bytes, iov_iter_single_seg_count(ii));
854 goto again;
855 }
856
857 err = 0;
858 req->pages[req->num_pages] = page;
859 req->num_pages++;
860
861 iov_iter_advance(ii, tmp);
862 count += tmp;
863 pos += tmp;
864 offset += tmp;
865 if (offset == PAGE_CACHE_SIZE)
866 offset = 0;
867
Miklos Szeredi78bb6cb2008-05-12 14:02:32 -0700868 if (!fc->big_writes)
869 break;
Nick Pigginea9b9902008-04-30 00:54:42 -0700870 } while (iov_iter_count(ii) && count < fc->max_write &&
871 req->num_pages < FUSE_MAX_PAGES_PER_REQ && offset == 0);
872
873 return count > 0 ? count : err;
874}
875
876static ssize_t fuse_perform_write(struct file *file,
877 struct address_space *mapping,
878 struct iov_iter *ii, loff_t pos)
879{
880 struct inode *inode = mapping->host;
881 struct fuse_conn *fc = get_fuse_conn(inode);
882 int err = 0;
883 ssize_t res = 0;
884
885 if (is_bad_inode(inode))
886 return -EIO;
887
888 do {
889 struct fuse_req *req;
890 ssize_t count;
891
892 req = fuse_get_req(fc);
893 if (IS_ERR(req)) {
894 err = PTR_ERR(req);
895 break;
896 }
897
898 count = fuse_fill_write_pages(req, mapping, ii, pos);
899 if (count <= 0) {
900 err = count;
901 } else {
902 size_t num_written;
903
904 num_written = fuse_send_write_pages(req, file, inode,
905 pos, count);
906 err = req->out.h.error;
907 if (!err) {
908 res += num_written;
909 pos += num_written;
910
911 /* break out of the loop on short write */
912 if (num_written != count)
913 err = -EIO;
914 }
915 }
916 fuse_put_request(fc, req);
917 } while (!err && iov_iter_count(ii));
918
919 if (res > 0)
920 fuse_write_update_size(inode, pos);
921
922 fuse_invalidate_attr(inode);
923
924 return res > 0 ? res : err;
925}
926
927static ssize_t fuse_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
928 unsigned long nr_segs, loff_t pos)
929{
930 struct file *file = iocb->ki_filp;
931 struct address_space *mapping = file->f_mapping;
932 size_t count = 0;
933 ssize_t written = 0;
934 struct inode *inode = mapping->host;
935 ssize_t err;
936 struct iov_iter i;
937
938 WARN_ON(iocb->ki_pos != pos);
939
940 err = generic_segment_checks(iov, &nr_segs, &count, VERIFY_READ);
941 if (err)
942 return err;
943
944 mutex_lock(&inode->i_mutex);
945 vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE);
946
947 /* We can write back this queue in page reclaim */
948 current->backing_dev_info = mapping->backing_dev_info;
949
950 err = generic_write_checks(file, &pos, &count, S_ISBLK(inode->i_mode));
951 if (err)
952 goto out;
953
954 if (count == 0)
955 goto out;
956
Miklos Szeredi2f1936b2008-06-24 16:50:14 +0200957 err = file_remove_suid(file);
Nick Pigginea9b9902008-04-30 00:54:42 -0700958 if (err)
959 goto out;
960
961 file_update_time(file);
962
963 iov_iter_init(&i, iov, nr_segs, count, 0);
964 written = fuse_perform_write(file, mapping, &i, pos);
965 if (written >= 0)
966 iocb->ki_pos = pos + written;
967
968out:
969 current->backing_dev_info = NULL;
970 mutex_unlock(&inode->i_mutex);
971
972 return written ? written : err;
973}
974
Miklos Szeredi413ef8c2005-09-09 13:10:35 -0700975static void fuse_release_user_pages(struct fuse_req *req, int write)
976{
977 unsigned i;
978
979 for (i = 0; i < req->num_pages; i++) {
980 struct page *page = req->pages[i];
981 if (write)
982 set_page_dirty_lock(page);
983 put_page(page);
984 }
985}
986
987static int fuse_get_user_pages(struct fuse_req *req, const char __user *buf,
Miklos Szeredice60a2f2009-04-09 17:37:52 +0200988 size_t *nbytesp, int write)
Miklos Szeredi413ef8c2005-09-09 13:10:35 -0700989{
Miklos Szeredice60a2f2009-04-09 17:37:52 +0200990 size_t nbytes = *nbytesp;
Miklos Szeredi413ef8c2005-09-09 13:10:35 -0700991 unsigned long user_addr = (unsigned long) buf;
992 unsigned offset = user_addr & ~PAGE_MASK;
993 int npages;
994
Miklos Szeredif4975c62009-04-02 14:25:34 +0200995 /* Special case for kernel I/O: can copy directly into the buffer */
996 if (segment_eq(get_fs(), KERNEL_DS)) {
997 if (write)
998 req->in.args[1].value = (void *) user_addr;
999 else
1000 req->out.args[0].value = (void *) user_addr;
1001
1002 return 0;
1003 }
Miklos Szeredi413ef8c2005-09-09 13:10:35 -07001004
Miklos Szeredice60a2f2009-04-09 17:37:52 +02001005 nbytes = min_t(size_t, nbytes, FUSE_MAX_PAGES_PER_REQ << PAGE_SHIFT);
Miklos Szeredi413ef8c2005-09-09 13:10:35 -07001006 npages = (nbytes + offset + PAGE_SIZE - 1) >> PAGE_SHIFT;
Harvey Harrisonbd730962008-05-01 04:35:15 -07001007 npages = clamp(npages, 1, FUSE_MAX_PAGES_PER_REQ);
Miklos Szeredi1bf94ca2010-05-25 15:06:06 +02001008 npages = get_user_pages_fast(user_addr, npages, !write, req->pages);
Miklos Szeredi413ef8c2005-09-09 13:10:35 -07001009 if (npages < 0)
1010 return npages;
1011
1012 req->num_pages = npages;
1013 req->page_offset = offset;
Miklos Szeredif4975c62009-04-02 14:25:34 +02001014
1015 if (write)
1016 req->in.argpages = 1;
1017 else
1018 req->out.argpages = 1;
1019
1020 nbytes = (req->num_pages << PAGE_SHIFT) - req->page_offset;
1021 *nbytesp = min(*nbytesp, nbytes);
1022
Miklos Szeredi413ef8c2005-09-09 13:10:35 -07001023 return 0;
1024}
1025
Tejun Heo08cbf542009-04-14 10:54:53 +09001026ssize_t fuse_direct_io(struct file *file, const char __user *buf,
1027 size_t count, loff_t *ppos, int write)
Miklos Szeredi413ef8c2005-09-09 13:10:35 -07001028{
Miklos Szeredi2106cb12009-04-28 16:56:37 +02001029 struct fuse_file *ff = file->private_data;
1030 struct fuse_conn *fc = ff->fc;
Miklos Szeredi413ef8c2005-09-09 13:10:35 -07001031 size_t nmax = write ? fc->max_write : fc->max_read;
1032 loff_t pos = *ppos;
1033 ssize_t res = 0;
Miklos Szeredi248d86e2006-01-06 00:19:39 -08001034 struct fuse_req *req;
1035
Miklos Szeredice1d5a42006-04-10 22:54:58 -07001036 req = fuse_get_req(fc);
1037 if (IS_ERR(req))
1038 return PTR_ERR(req);
Miklos Szeredi413ef8c2005-09-09 13:10:35 -07001039
1040 while (count) {
Miklos Szeredi413ef8c2005-09-09 13:10:35 -07001041 size_t nres;
Miklos Szeredi2106cb12009-04-28 16:56:37 +02001042 fl_owner_t owner = current->files;
Miklos Szeredif4975c62009-04-02 14:25:34 +02001043 size_t nbytes = min(count, nmax);
1044 int err = fuse_get_user_pages(req, buf, &nbytes, write);
Miklos Szeredi413ef8c2005-09-09 13:10:35 -07001045 if (err) {
1046 res = err;
1047 break;
1048 }
Miklos Szeredif4975c62009-04-02 14:25:34 +02001049
Miklos Szeredi413ef8c2005-09-09 13:10:35 -07001050 if (write)
Miklos Szeredi2106cb12009-04-28 16:56:37 +02001051 nres = fuse_send_write(req, file, pos, nbytes, owner);
Miklos Szeredi413ef8c2005-09-09 13:10:35 -07001052 else
Miklos Szeredi2106cb12009-04-28 16:56:37 +02001053 nres = fuse_send_read(req, file, pos, nbytes, owner);
1054
Miklos Szeredi413ef8c2005-09-09 13:10:35 -07001055 fuse_release_user_pages(req, !write);
1056 if (req->out.h.error) {
1057 if (!res)
1058 res = req->out.h.error;
1059 break;
1060 } else if (nres > nbytes) {
1061 res = -EIO;
1062 break;
1063 }
1064 count -= nres;
1065 res += nres;
1066 pos += nres;
1067 buf += nres;
1068 if (nres != nbytes)
1069 break;
Miklos Szeredi56cf34f2006-04-11 21:16:51 +02001070 if (count) {
1071 fuse_put_request(fc, req);
1072 req = fuse_get_req(fc);
1073 if (IS_ERR(req))
1074 break;
1075 }
Miklos Szeredi413ef8c2005-09-09 13:10:35 -07001076 }
Anand V. Avatif60311d2009-10-22 06:24:52 -07001077 if (!IS_ERR(req))
1078 fuse_put_request(fc, req);
Miklos Szeredid09cb9d2009-04-28 16:56:36 +02001079 if (res > 0)
Miklos Szeredi413ef8c2005-09-09 13:10:35 -07001080 *ppos = pos;
Miklos Szeredi413ef8c2005-09-09 13:10:35 -07001081
1082 return res;
1083}
Tejun Heo08cbf542009-04-14 10:54:53 +09001084EXPORT_SYMBOL_GPL(fuse_direct_io);
Miklos Szeredi413ef8c2005-09-09 13:10:35 -07001085
1086static ssize_t fuse_direct_read(struct file *file, char __user *buf,
1087 size_t count, loff_t *ppos)
1088{
Miklos Szeredid09cb9d2009-04-28 16:56:36 +02001089 ssize_t res;
1090 struct inode *inode = file->f_path.dentry->d_inode;
1091
1092 if (is_bad_inode(inode))
1093 return -EIO;
1094
1095 res = fuse_direct_io(file, buf, count, ppos, 0);
1096
1097 fuse_invalidate_attr(inode);
1098
1099 return res;
Miklos Szeredi413ef8c2005-09-09 13:10:35 -07001100}
1101
1102static ssize_t fuse_direct_write(struct file *file, const char __user *buf,
1103 size_t count, loff_t *ppos)
1104{
Josef Sipek7706a9d2006-12-08 02:37:02 -08001105 struct inode *inode = file->f_path.dentry->d_inode;
Miklos Szeredi413ef8c2005-09-09 13:10:35 -07001106 ssize_t res;
Miklos Szeredid09cb9d2009-04-28 16:56:36 +02001107
1108 if (is_bad_inode(inode))
1109 return -EIO;
1110
Miklos Szeredi413ef8c2005-09-09 13:10:35 -07001111 /* Don't allow parallel writes to the same file */
Jes Sorensen1b1dcc12006-01-09 15:59:24 -08001112 mutex_lock(&inode->i_mutex);
Miklos Szeredi889f7842007-05-23 13:57:54 -07001113 res = generic_write_checks(file, ppos, &count, 0);
Miklos Szeredid09cb9d2009-04-28 16:56:36 +02001114 if (!res) {
Miklos Szeredi889f7842007-05-23 13:57:54 -07001115 res = fuse_direct_io(file, buf, count, ppos, 1);
Miklos Szeredid09cb9d2009-04-28 16:56:36 +02001116 if (res > 0)
1117 fuse_write_update_size(inode, *ppos);
1118 }
Jes Sorensen1b1dcc12006-01-09 15:59:24 -08001119 mutex_unlock(&inode->i_mutex);
Miklos Szeredid09cb9d2009-04-28 16:56:36 +02001120
1121 fuse_invalidate_attr(inode);
1122
Miklos Szeredi413ef8c2005-09-09 13:10:35 -07001123 return res;
1124}
1125
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001126static void fuse_writepage_free(struct fuse_conn *fc, struct fuse_req *req)
Miklos Szeredib6aeade2005-09-09 13:10:30 -07001127{
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001128 __free_page(req->pages[0]);
1129 fuse_file_put(req->ff);
Miklos Szeredib6aeade2005-09-09 13:10:30 -07001130}
1131
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001132static void fuse_writepage_finish(struct fuse_conn *fc, struct fuse_req *req)
Miklos Szeredib6aeade2005-09-09 13:10:30 -07001133{
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001134 struct inode *inode = req->inode;
1135 struct fuse_inode *fi = get_fuse_inode(inode);
1136 struct backing_dev_info *bdi = inode->i_mapping->backing_dev_info;
1137
1138 list_del(&req->writepages_entry);
1139 dec_bdi_stat(bdi, BDI_WRITEBACK);
1140 dec_zone_page_state(req->pages[0], NR_WRITEBACK_TEMP);
1141 bdi_writeout_inc(bdi);
1142 wake_up(&fi->page_waitq);
1143}
1144
1145/* Called under fc->lock, may release and reacquire it */
1146static void fuse_send_writepage(struct fuse_conn *fc, struct fuse_req *req)
Harvey Harrison5d9ec852008-12-02 14:49:42 +01001147__releases(&fc->lock)
1148__acquires(&fc->lock)
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001149{
1150 struct fuse_inode *fi = get_fuse_inode(req->inode);
1151 loff_t size = i_size_read(req->inode);
1152 struct fuse_write_in *inarg = &req->misc.write.in;
1153
1154 if (!fc->connected)
1155 goto out_free;
1156
1157 if (inarg->offset + PAGE_CACHE_SIZE <= size) {
1158 inarg->size = PAGE_CACHE_SIZE;
1159 } else if (inarg->offset < size) {
1160 inarg->size = size & (PAGE_CACHE_SIZE - 1);
1161 } else {
1162 /* Got truncated off completely */
1163 goto out_free;
1164 }
1165
1166 req->in.args[1].size = inarg->size;
1167 fi->writectr++;
Tejun Heob93f8582008-11-26 12:03:55 +01001168 fuse_request_send_background_locked(fc, req);
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001169 return;
1170
1171 out_free:
1172 fuse_writepage_finish(fc, req);
1173 spin_unlock(&fc->lock);
1174 fuse_writepage_free(fc, req);
Tejun Heoe9bb09d2008-11-26 12:03:54 +01001175 fuse_put_request(fc, req);
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001176 spin_lock(&fc->lock);
1177}
1178
1179/*
1180 * If fi->writectr is positive (no truncate or fsync going on) send
1181 * all queued writepage requests.
1182 *
1183 * Called with fc->lock
1184 */
1185void fuse_flush_writepages(struct inode *inode)
Harvey Harrison5d9ec852008-12-02 14:49:42 +01001186__releases(&fc->lock)
1187__acquires(&fc->lock)
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001188{
1189 struct fuse_conn *fc = get_fuse_conn(inode);
1190 struct fuse_inode *fi = get_fuse_inode(inode);
1191 struct fuse_req *req;
1192
1193 while (fi->writectr >= 0 && !list_empty(&fi->queued_writes)) {
1194 req = list_entry(fi->queued_writes.next, struct fuse_req, list);
1195 list_del_init(&req->list);
1196 fuse_send_writepage(fc, req);
1197 }
1198}
1199
1200static void fuse_writepage_end(struct fuse_conn *fc, struct fuse_req *req)
1201{
1202 struct inode *inode = req->inode;
1203 struct fuse_inode *fi = get_fuse_inode(inode);
1204
1205 mapping_set_error(inode->i_mapping, req->out.h.error);
1206 spin_lock(&fc->lock);
1207 fi->writectr--;
1208 fuse_writepage_finish(fc, req);
1209 spin_unlock(&fc->lock);
1210 fuse_writepage_free(fc, req);
1211}
1212
1213static int fuse_writepage_locked(struct page *page)
1214{
1215 struct address_space *mapping = page->mapping;
1216 struct inode *inode = mapping->host;
1217 struct fuse_conn *fc = get_fuse_conn(inode);
1218 struct fuse_inode *fi = get_fuse_inode(inode);
1219 struct fuse_req *req;
1220 struct fuse_file *ff;
1221 struct page *tmp_page;
1222
1223 set_page_writeback(page);
1224
1225 req = fuse_request_alloc_nofs();
1226 if (!req)
1227 goto err;
1228
1229 tmp_page = alloc_page(GFP_NOFS | __GFP_HIGHMEM);
1230 if (!tmp_page)
1231 goto err_free;
1232
1233 spin_lock(&fc->lock);
1234 BUG_ON(list_empty(&fi->write_files));
1235 ff = list_entry(fi->write_files.next, struct fuse_file, write_entry);
1236 req->ff = fuse_file_get(ff);
1237 spin_unlock(&fc->lock);
1238
Miklos Szeredi2106cb12009-04-28 16:56:37 +02001239 fuse_write_fill(req, ff, page_offset(page), 0);
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001240
1241 copy_highpage(tmp_page, page);
Miklos Szeredi2d698b02009-04-28 16:56:36 +02001242 req->misc.write.in.write_flags |= FUSE_WRITE_CACHE;
Miklos Szeredif4975c62009-04-02 14:25:34 +02001243 req->in.argpages = 1;
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001244 req->num_pages = 1;
1245 req->pages[0] = tmp_page;
1246 req->page_offset = 0;
1247 req->end = fuse_writepage_end;
1248 req->inode = inode;
1249
1250 inc_bdi_stat(mapping->backing_dev_info, BDI_WRITEBACK);
1251 inc_zone_page_state(tmp_page, NR_WRITEBACK_TEMP);
1252 end_page_writeback(page);
1253
1254 spin_lock(&fc->lock);
1255 list_add(&req->writepages_entry, &fi->writepages);
1256 list_add_tail(&req->list, &fi->queued_writes);
1257 fuse_flush_writepages(inode);
1258 spin_unlock(&fc->lock);
1259
1260 return 0;
1261
1262err_free:
1263 fuse_request_free(req);
1264err:
1265 end_page_writeback(page);
1266 return -ENOMEM;
1267}
1268
1269static int fuse_writepage(struct page *page, struct writeback_control *wbc)
1270{
1271 int err;
1272
1273 err = fuse_writepage_locked(page);
1274 unlock_page(page);
1275
1276 return err;
1277}
1278
1279static int fuse_launder_page(struct page *page)
1280{
1281 int err = 0;
1282 if (clear_page_dirty_for_io(page)) {
1283 struct inode *inode = page->mapping->host;
1284 err = fuse_writepage_locked(page);
1285 if (!err)
1286 fuse_wait_on_page_writeback(inode, page->index);
1287 }
1288 return err;
1289}
1290
1291/*
1292 * Write back dirty pages now, because there may not be any suitable
1293 * open files later
1294 */
1295static void fuse_vma_close(struct vm_area_struct *vma)
1296{
1297 filemap_write_and_wait(vma->vm_file->f_mapping);
1298}
1299
1300/*
1301 * Wait for writeback against this page to complete before allowing it
1302 * to be marked dirty again, and hence written back again, possibly
1303 * before the previous writepage completed.
1304 *
1305 * Block here, instead of in ->writepage(), so that the userspace fs
1306 * can only block processes actually operating on the filesystem.
1307 *
1308 * Otherwise unprivileged userspace fs would be able to block
1309 * unrelated:
1310 *
1311 * - page migration
1312 * - sync(2)
1313 * - try_to_free_pages() with order > PAGE_ALLOC_COSTLY_ORDER
1314 */
Nick Pigginc2ec1752009-03-31 15:23:21 -07001315static int fuse_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001316{
Nick Pigginc2ec1752009-03-31 15:23:21 -07001317 struct page *page = vmf->page;
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001318 /*
1319 * Don't use page->mapping as it may become NULL from a
1320 * concurrent truncate.
1321 */
1322 struct inode *inode = vma->vm_file->f_mapping->host;
1323
1324 fuse_wait_on_page_writeback(inode, page->index);
1325 return 0;
1326}
1327
Alexey Dobriyanf0f37e22009-09-27 22:29:37 +04001328static const struct vm_operations_struct fuse_file_vm_ops = {
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001329 .close = fuse_vma_close,
1330 .fault = filemap_fault,
1331 .page_mkwrite = fuse_page_mkwrite,
1332};
1333
1334static int fuse_file_mmap(struct file *file, struct vm_area_struct *vma)
1335{
1336 if ((vma->vm_flags & VM_SHARED) && (vma->vm_flags & VM_MAYWRITE)) {
1337 struct inode *inode = file->f_dentry->d_inode;
1338 struct fuse_conn *fc = get_fuse_conn(inode);
1339 struct fuse_inode *fi = get_fuse_inode(inode);
1340 struct fuse_file *ff = file->private_data;
1341 /*
1342 * file may be written through mmap, so chain it onto the
1343 * inodes's write_file list
1344 */
1345 spin_lock(&fc->lock);
1346 if (list_empty(&ff->write_entry))
1347 list_add(&ff->write_entry, &fi->write_files);
1348 spin_unlock(&fc->lock);
1349 }
1350 file_accessed(file);
1351 vma->vm_ops = &fuse_file_vm_ops;
Miklos Szeredib6aeade2005-09-09 13:10:30 -07001352 return 0;
1353}
1354
Miklos Szeredifc280c92009-04-02 14:25:35 +02001355static int fuse_direct_mmap(struct file *file, struct vm_area_struct *vma)
1356{
1357 /* Can't provide the coherency needed for MAP_SHARED */
1358 if (vma->vm_flags & VM_MAYSHARE)
1359 return -ENODEV;
1360
Miklos Szeredi3121bfe2009-04-09 17:37:53 +02001361 invalidate_inode_pages2(file->f_mapping);
1362
Miklos Szeredifc280c92009-04-02 14:25:35 +02001363 return generic_file_mmap(file, vma);
1364}
1365
Miklos Szeredi71421252006-06-25 05:48:52 -07001366static int convert_fuse_file_lock(const struct fuse_file_lock *ffl,
1367 struct file_lock *fl)
1368{
1369 switch (ffl->type) {
1370 case F_UNLCK:
1371 break;
1372
1373 case F_RDLCK:
1374 case F_WRLCK:
1375 if (ffl->start > OFFSET_MAX || ffl->end > OFFSET_MAX ||
1376 ffl->end < ffl->start)
1377 return -EIO;
1378
1379 fl->fl_start = ffl->start;
1380 fl->fl_end = ffl->end;
1381 fl->fl_pid = ffl->pid;
1382 break;
1383
1384 default:
1385 return -EIO;
1386 }
1387 fl->fl_type = ffl->type;
1388 return 0;
1389}
1390
1391static void fuse_lk_fill(struct fuse_req *req, struct file *file,
Miklos Szeredia9ff4f82007-10-18 03:07:02 -07001392 const struct file_lock *fl, int opcode, pid_t pid,
1393 int flock)
Miklos Szeredi71421252006-06-25 05:48:52 -07001394{
Josef Sipek7706a9d2006-12-08 02:37:02 -08001395 struct inode *inode = file->f_path.dentry->d_inode;
Miklos Szeredi9c8ef562006-06-25 05:48:55 -07001396 struct fuse_conn *fc = get_fuse_conn(inode);
Miklos Szeredi71421252006-06-25 05:48:52 -07001397 struct fuse_file *ff = file->private_data;
1398 struct fuse_lk_in *arg = &req->misc.lk_in;
1399
1400 arg->fh = ff->fh;
Miklos Szeredi9c8ef562006-06-25 05:48:55 -07001401 arg->owner = fuse_lock_owner_id(fc, fl->fl_owner);
Miklos Szeredi71421252006-06-25 05:48:52 -07001402 arg->lk.start = fl->fl_start;
1403 arg->lk.end = fl->fl_end;
1404 arg->lk.type = fl->fl_type;
1405 arg->lk.pid = pid;
Miklos Szeredia9ff4f82007-10-18 03:07:02 -07001406 if (flock)
1407 arg->lk_flags |= FUSE_LK_FLOCK;
Miklos Szeredi71421252006-06-25 05:48:52 -07001408 req->in.h.opcode = opcode;
1409 req->in.h.nodeid = get_node_id(inode);
1410 req->in.numargs = 1;
1411 req->in.args[0].size = sizeof(*arg);
1412 req->in.args[0].value = arg;
1413}
1414
1415static int fuse_getlk(struct file *file, struct file_lock *fl)
1416{
Josef Sipek7706a9d2006-12-08 02:37:02 -08001417 struct inode *inode = file->f_path.dentry->d_inode;
Miklos Szeredi71421252006-06-25 05:48:52 -07001418 struct fuse_conn *fc = get_fuse_conn(inode);
1419 struct fuse_req *req;
1420 struct fuse_lk_out outarg;
1421 int err;
1422
1423 req = fuse_get_req(fc);
1424 if (IS_ERR(req))
1425 return PTR_ERR(req);
1426
Miklos Szeredia9ff4f82007-10-18 03:07:02 -07001427 fuse_lk_fill(req, file, fl, FUSE_GETLK, 0, 0);
Miklos Szeredi71421252006-06-25 05:48:52 -07001428 req->out.numargs = 1;
1429 req->out.args[0].size = sizeof(outarg);
1430 req->out.args[0].value = &outarg;
Tejun Heob93f8582008-11-26 12:03:55 +01001431 fuse_request_send(fc, req);
Miklos Szeredi71421252006-06-25 05:48:52 -07001432 err = req->out.h.error;
1433 fuse_put_request(fc, req);
1434 if (!err)
1435 err = convert_fuse_file_lock(&outarg.lk, fl);
1436
1437 return err;
1438}
1439
Miklos Szeredia9ff4f82007-10-18 03:07:02 -07001440static int fuse_setlk(struct file *file, struct file_lock *fl, int flock)
Miklos Szeredi71421252006-06-25 05:48:52 -07001441{
Josef Sipek7706a9d2006-12-08 02:37:02 -08001442 struct inode *inode = file->f_path.dentry->d_inode;
Miklos Szeredi71421252006-06-25 05:48:52 -07001443 struct fuse_conn *fc = get_fuse_conn(inode);
1444 struct fuse_req *req;
1445 int opcode = (fl->fl_flags & FL_SLEEP) ? FUSE_SETLKW : FUSE_SETLK;
1446 pid_t pid = fl->fl_type != F_UNLCK ? current->tgid : 0;
1447 int err;
1448
Miklos Szeredi48e90762008-07-25 01:49:02 -07001449 if (fl->fl_lmops && fl->fl_lmops->fl_grant) {
1450 /* NLM needs asynchronous locks, which we don't support yet */
1451 return -ENOLCK;
1452 }
1453
Miklos Szeredi71421252006-06-25 05:48:52 -07001454 /* Unlock on close is handled by the flush method */
1455 if (fl->fl_flags & FL_CLOSE)
1456 return 0;
1457
1458 req = fuse_get_req(fc);
1459 if (IS_ERR(req))
1460 return PTR_ERR(req);
1461
Miklos Szeredia9ff4f82007-10-18 03:07:02 -07001462 fuse_lk_fill(req, file, fl, opcode, pid, flock);
Tejun Heob93f8582008-11-26 12:03:55 +01001463 fuse_request_send(fc, req);
Miklos Szeredi71421252006-06-25 05:48:52 -07001464 err = req->out.h.error;
Miklos Szeredia4d27e72006-06-25 05:48:54 -07001465 /* locking is restartable */
1466 if (err == -EINTR)
1467 err = -ERESTARTSYS;
Miklos Szeredi71421252006-06-25 05:48:52 -07001468 fuse_put_request(fc, req);
1469 return err;
1470}
1471
1472static int fuse_file_lock(struct file *file, int cmd, struct file_lock *fl)
1473{
Josef Sipek7706a9d2006-12-08 02:37:02 -08001474 struct inode *inode = file->f_path.dentry->d_inode;
Miklos Szeredi71421252006-06-25 05:48:52 -07001475 struct fuse_conn *fc = get_fuse_conn(inode);
1476 int err;
1477
Miklos Szeredi48e90762008-07-25 01:49:02 -07001478 if (cmd == F_CANCELLK) {
1479 err = 0;
1480 } else if (cmd == F_GETLK) {
Miklos Szeredi71421252006-06-25 05:48:52 -07001481 if (fc->no_lock) {
Marc Eshel9d6a8c52007-02-21 00:55:18 -05001482 posix_test_lock(file, fl);
Miklos Szeredi71421252006-06-25 05:48:52 -07001483 err = 0;
1484 } else
1485 err = fuse_getlk(file, fl);
1486 } else {
1487 if (fc->no_lock)
Miklos Szeredi48e90762008-07-25 01:49:02 -07001488 err = posix_lock_file(file, fl, NULL);
Miklos Szeredi71421252006-06-25 05:48:52 -07001489 else
Miklos Szeredia9ff4f82007-10-18 03:07:02 -07001490 err = fuse_setlk(file, fl, 0);
Miklos Szeredi71421252006-06-25 05:48:52 -07001491 }
1492 return err;
1493}
1494
Miklos Szeredia9ff4f82007-10-18 03:07:02 -07001495static int fuse_file_flock(struct file *file, int cmd, struct file_lock *fl)
1496{
1497 struct inode *inode = file->f_path.dentry->d_inode;
1498 struct fuse_conn *fc = get_fuse_conn(inode);
1499 int err;
1500
1501 if (fc->no_lock) {
1502 err = flock_lock_file_wait(file, fl);
1503 } else {
1504 /* emulate flock with POSIX locks */
1505 fl->fl_owner = (fl_owner_t) file;
1506 err = fuse_setlk(file, fl, 1);
1507 }
1508
1509 return err;
1510}
1511
Miklos Szeredib2d22722006-12-06 20:35:51 -08001512static sector_t fuse_bmap(struct address_space *mapping, sector_t block)
1513{
1514 struct inode *inode = mapping->host;
1515 struct fuse_conn *fc = get_fuse_conn(inode);
1516 struct fuse_req *req;
1517 struct fuse_bmap_in inarg;
1518 struct fuse_bmap_out outarg;
1519 int err;
1520
1521 if (!inode->i_sb->s_bdev || fc->no_bmap)
1522 return 0;
1523
1524 req = fuse_get_req(fc);
1525 if (IS_ERR(req))
1526 return 0;
1527
1528 memset(&inarg, 0, sizeof(inarg));
1529 inarg.block = block;
1530 inarg.blocksize = inode->i_sb->s_blocksize;
1531 req->in.h.opcode = FUSE_BMAP;
1532 req->in.h.nodeid = get_node_id(inode);
1533 req->in.numargs = 1;
1534 req->in.args[0].size = sizeof(inarg);
1535 req->in.args[0].value = &inarg;
1536 req->out.numargs = 1;
1537 req->out.args[0].size = sizeof(outarg);
1538 req->out.args[0].value = &outarg;
Tejun Heob93f8582008-11-26 12:03:55 +01001539 fuse_request_send(fc, req);
Miklos Szeredib2d22722006-12-06 20:35:51 -08001540 err = req->out.h.error;
1541 fuse_put_request(fc, req);
1542 if (err == -ENOSYS)
1543 fc->no_bmap = 1;
1544
1545 return err ? 0 : outarg.block;
1546}
1547
Miklos Szeredi5559b8f2008-04-30 00:54:45 -07001548static loff_t fuse_file_llseek(struct file *file, loff_t offset, int origin)
1549{
1550 loff_t retval;
1551 struct inode *inode = file->f_path.dentry->d_inode;
1552
1553 mutex_lock(&inode->i_mutex);
1554 switch (origin) {
1555 case SEEK_END:
Miklos Szeredi769415c2008-10-16 16:08:56 +02001556 retval = fuse_update_attributes(inode, NULL, file, NULL);
1557 if (retval)
Dan Carpenter52916582009-03-27 13:36:10 +03001558 goto exit;
Miklos Szeredi5559b8f2008-04-30 00:54:45 -07001559 offset += i_size_read(inode);
1560 break;
1561 case SEEK_CUR:
1562 offset += file->f_pos;
1563 }
1564 retval = -EINVAL;
1565 if (offset >= 0 && offset <= inode->i_sb->s_maxbytes) {
1566 if (offset != file->f_pos) {
1567 file->f_pos = offset;
1568 file->f_version = 0;
1569 }
1570 retval = offset;
1571 }
Dan Carpenter52916582009-03-27 13:36:10 +03001572exit:
Miklos Szeredi5559b8f2008-04-30 00:54:45 -07001573 mutex_unlock(&inode->i_mutex);
1574 return retval;
1575}
1576
Tejun Heo59efec72008-11-26 12:03:55 +01001577static int fuse_ioctl_copy_user(struct page **pages, struct iovec *iov,
1578 unsigned int nr_segs, size_t bytes, bool to_user)
1579{
1580 struct iov_iter ii;
1581 int page_idx = 0;
1582
1583 if (!bytes)
1584 return 0;
1585
1586 iov_iter_init(&ii, iov, nr_segs, bytes, 0);
1587
1588 while (iov_iter_count(&ii)) {
1589 struct page *page = pages[page_idx++];
1590 size_t todo = min_t(size_t, PAGE_SIZE, iov_iter_count(&ii));
Dan Carpenter4aa0edd2010-05-07 10:28:17 +02001591 void *kaddr;
Tejun Heo59efec72008-11-26 12:03:55 +01001592
Dan Carpenter4aa0edd2010-05-07 10:28:17 +02001593 kaddr = kmap(page);
Tejun Heo59efec72008-11-26 12:03:55 +01001594
1595 while (todo) {
1596 char __user *uaddr = ii.iov->iov_base + ii.iov_offset;
1597 size_t iov_len = ii.iov->iov_len - ii.iov_offset;
1598 size_t copy = min(todo, iov_len);
1599 size_t left;
1600
1601 if (!to_user)
1602 left = copy_from_user(kaddr, uaddr, copy);
1603 else
1604 left = copy_to_user(uaddr, kaddr, copy);
1605
1606 if (unlikely(left))
1607 return -EFAULT;
1608
1609 iov_iter_advance(&ii, copy);
1610 todo -= copy;
1611 kaddr += copy;
1612 }
1613
Jens Axboe0bd87182009-11-03 11:40:44 +01001614 kunmap(page);
Tejun Heo59efec72008-11-26 12:03:55 +01001615 }
1616
1617 return 0;
1618}
1619
1620/*
1621 * For ioctls, there is no generic way to determine how much memory
1622 * needs to be read and/or written. Furthermore, ioctls are allowed
1623 * to dereference the passed pointer, so the parameter requires deep
1624 * copying but FUSE has no idea whatsoever about what to copy in or
1625 * out.
1626 *
1627 * This is solved by allowing FUSE server to retry ioctl with
1628 * necessary in/out iovecs. Let's assume the ioctl implementation
1629 * needs to read in the following structure.
1630 *
1631 * struct a {
1632 * char *buf;
1633 * size_t buflen;
1634 * }
1635 *
1636 * On the first callout to FUSE server, inarg->in_size and
1637 * inarg->out_size will be NULL; then, the server completes the ioctl
1638 * with FUSE_IOCTL_RETRY set in out->flags, out->in_iovs set to 1 and
1639 * the actual iov array to
1640 *
1641 * { { .iov_base = inarg.arg, .iov_len = sizeof(struct a) } }
1642 *
1643 * which tells FUSE to copy in the requested area and retry the ioctl.
1644 * On the second round, the server has access to the structure and
1645 * from that it can tell what to look for next, so on the invocation,
1646 * it sets FUSE_IOCTL_RETRY, out->in_iovs to 2 and iov array to
1647 *
1648 * { { .iov_base = inarg.arg, .iov_len = sizeof(struct a) },
1649 * { .iov_base = a.buf, .iov_len = a.buflen } }
1650 *
1651 * FUSE will copy both struct a and the pointed buffer from the
1652 * process doing the ioctl and retry ioctl with both struct a and the
1653 * buffer.
1654 *
1655 * This time, FUSE server has everything it needs and completes ioctl
1656 * without FUSE_IOCTL_RETRY which finishes the ioctl call.
1657 *
1658 * Copying data out works the same way.
1659 *
1660 * Note that if FUSE_IOCTL_UNRESTRICTED is clear, the kernel
1661 * automatically initializes in and out iovs by decoding @cmd with
1662 * _IOC_* macros and the server is not allowed to request RETRY. This
1663 * limits ioctl data transfers to well-formed ioctls and is the forced
1664 * behavior for all FUSE servers.
1665 */
Tejun Heo08cbf542009-04-14 10:54:53 +09001666long fuse_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg,
1667 unsigned int flags)
Tejun Heo59efec72008-11-26 12:03:55 +01001668{
Tejun Heo59efec72008-11-26 12:03:55 +01001669 struct fuse_file *ff = file->private_data;
Miklos Szeredid36f2482009-04-28 16:56:39 +02001670 struct fuse_conn *fc = ff->fc;
Tejun Heo59efec72008-11-26 12:03:55 +01001671 struct fuse_ioctl_in inarg = {
1672 .fh = ff->fh,
1673 .cmd = cmd,
1674 .arg = arg,
1675 .flags = flags
1676 };
1677 struct fuse_ioctl_out outarg;
1678 struct fuse_req *req = NULL;
1679 struct page **pages = NULL;
1680 struct page *iov_page = NULL;
1681 struct iovec *in_iov = NULL, *out_iov = NULL;
1682 unsigned int in_iovs = 0, out_iovs = 0, num_pages = 0, max_pages;
1683 size_t in_size, out_size, transferred;
1684 int err;
1685
1686 /* assume all the iovs returned by client always fits in a page */
1687 BUILD_BUG_ON(sizeof(struct iovec) * FUSE_IOCTL_MAX_IOV > PAGE_SIZE);
1688
Tejun Heo59efec72008-11-26 12:03:55 +01001689 err = -ENOMEM;
1690 pages = kzalloc(sizeof(pages[0]) * FUSE_MAX_PAGES_PER_REQ, GFP_KERNEL);
1691 iov_page = alloc_page(GFP_KERNEL);
1692 if (!pages || !iov_page)
1693 goto out;
1694
1695 /*
1696 * If restricted, initialize IO parameters as encoded in @cmd.
1697 * RETRY from server is not allowed.
1698 */
1699 if (!(flags & FUSE_IOCTL_UNRESTRICTED)) {
1700 struct iovec *iov = page_address(iov_page);
1701
Miklos Szeredic9f0523d2008-12-02 14:49:42 +01001702 iov->iov_base = (void __user *)arg;
Tejun Heo59efec72008-11-26 12:03:55 +01001703 iov->iov_len = _IOC_SIZE(cmd);
1704
1705 if (_IOC_DIR(cmd) & _IOC_WRITE) {
1706 in_iov = iov;
1707 in_iovs = 1;
1708 }
1709
1710 if (_IOC_DIR(cmd) & _IOC_READ) {
1711 out_iov = iov;
1712 out_iovs = 1;
1713 }
1714 }
1715
1716 retry:
1717 inarg.in_size = in_size = iov_length(in_iov, in_iovs);
1718 inarg.out_size = out_size = iov_length(out_iov, out_iovs);
1719
1720 /*
1721 * Out data can be used either for actual out data or iovs,
1722 * make sure there always is at least one page.
1723 */
1724 out_size = max_t(size_t, out_size, PAGE_SIZE);
1725 max_pages = DIV_ROUND_UP(max(in_size, out_size), PAGE_SIZE);
1726
1727 /* make sure there are enough buffer pages and init request with them */
1728 err = -ENOMEM;
1729 if (max_pages > FUSE_MAX_PAGES_PER_REQ)
1730 goto out;
1731 while (num_pages < max_pages) {
1732 pages[num_pages] = alloc_page(GFP_KERNEL | __GFP_HIGHMEM);
1733 if (!pages[num_pages])
1734 goto out;
1735 num_pages++;
1736 }
1737
1738 req = fuse_get_req(fc);
1739 if (IS_ERR(req)) {
1740 err = PTR_ERR(req);
1741 req = NULL;
1742 goto out;
1743 }
1744 memcpy(req->pages, pages, sizeof(req->pages[0]) * num_pages);
1745 req->num_pages = num_pages;
1746
1747 /* okay, let's send it to the client */
1748 req->in.h.opcode = FUSE_IOCTL;
Miklos Szeredid36f2482009-04-28 16:56:39 +02001749 req->in.h.nodeid = ff->nodeid;
Tejun Heo59efec72008-11-26 12:03:55 +01001750 req->in.numargs = 1;
1751 req->in.args[0].size = sizeof(inarg);
1752 req->in.args[0].value = &inarg;
1753 if (in_size) {
1754 req->in.numargs++;
1755 req->in.args[1].size = in_size;
1756 req->in.argpages = 1;
1757
1758 err = fuse_ioctl_copy_user(pages, in_iov, in_iovs, in_size,
1759 false);
1760 if (err)
1761 goto out;
1762 }
1763
1764 req->out.numargs = 2;
1765 req->out.args[0].size = sizeof(outarg);
1766 req->out.args[0].value = &outarg;
1767 req->out.args[1].size = out_size;
1768 req->out.argpages = 1;
1769 req->out.argvar = 1;
1770
Tejun Heob93f8582008-11-26 12:03:55 +01001771 fuse_request_send(fc, req);
Tejun Heo59efec72008-11-26 12:03:55 +01001772 err = req->out.h.error;
1773 transferred = req->out.args[1].size;
1774 fuse_put_request(fc, req);
1775 req = NULL;
1776 if (err)
1777 goto out;
1778
1779 /* did it ask for retry? */
1780 if (outarg.flags & FUSE_IOCTL_RETRY) {
1781 char *vaddr;
1782
1783 /* no retry if in restricted mode */
1784 err = -EIO;
1785 if (!(flags & FUSE_IOCTL_UNRESTRICTED))
1786 goto out;
1787
1788 in_iovs = outarg.in_iovs;
1789 out_iovs = outarg.out_iovs;
1790
1791 /*
1792 * Make sure things are in boundary, separate checks
1793 * are to protect against overflow.
1794 */
1795 err = -ENOMEM;
1796 if (in_iovs > FUSE_IOCTL_MAX_IOV ||
1797 out_iovs > FUSE_IOCTL_MAX_IOV ||
1798 in_iovs + out_iovs > FUSE_IOCTL_MAX_IOV)
1799 goto out;
1800
1801 err = -EIO;
1802 if ((in_iovs + out_iovs) * sizeof(struct iovec) != transferred)
1803 goto out;
1804
1805 /* okay, copy in iovs and retry */
1806 vaddr = kmap_atomic(pages[0], KM_USER0);
1807 memcpy(page_address(iov_page), vaddr, transferred);
1808 kunmap_atomic(vaddr, KM_USER0);
1809
1810 in_iov = page_address(iov_page);
1811 out_iov = in_iov + in_iovs;
1812
1813 goto retry;
1814 }
1815
1816 err = -EIO;
1817 if (transferred > inarg.out_size)
1818 goto out;
1819
1820 err = fuse_ioctl_copy_user(pages, out_iov, out_iovs, transferred, true);
1821 out:
1822 if (req)
1823 fuse_put_request(fc, req);
1824 if (iov_page)
1825 __free_page(iov_page);
1826 while (num_pages)
1827 __free_page(pages[--num_pages]);
1828 kfree(pages);
1829
1830 return err ? err : outarg.result;
1831}
Tejun Heo08cbf542009-04-14 10:54:53 +09001832EXPORT_SYMBOL_GPL(fuse_do_ioctl);
Tejun Heo59efec72008-11-26 12:03:55 +01001833
Miklos Szeredid36f2482009-04-28 16:56:39 +02001834static long fuse_file_ioctl_common(struct file *file, unsigned int cmd,
1835 unsigned long arg, unsigned int flags)
1836{
1837 struct inode *inode = file->f_dentry->d_inode;
1838 struct fuse_conn *fc = get_fuse_conn(inode);
1839
1840 if (!fuse_allow_task(fc, current))
1841 return -EACCES;
1842
1843 if (is_bad_inode(inode))
1844 return -EIO;
1845
1846 return fuse_do_ioctl(file, cmd, arg, flags);
1847}
1848
Tejun Heo59efec72008-11-26 12:03:55 +01001849static long fuse_file_ioctl(struct file *file, unsigned int cmd,
1850 unsigned long arg)
1851{
Miklos Szeredid36f2482009-04-28 16:56:39 +02001852 return fuse_file_ioctl_common(file, cmd, arg, 0);
Tejun Heo59efec72008-11-26 12:03:55 +01001853}
1854
1855static long fuse_file_compat_ioctl(struct file *file, unsigned int cmd,
1856 unsigned long arg)
1857{
Miklos Szeredid36f2482009-04-28 16:56:39 +02001858 return fuse_file_ioctl_common(file, cmd, arg, FUSE_IOCTL_COMPAT);
Tejun Heo59efec72008-11-26 12:03:55 +01001859}
1860
Tejun Heo95668a62008-11-26 12:03:55 +01001861/*
1862 * All files which have been polled are linked to RB tree
1863 * fuse_conn->polled_files which is indexed by kh. Walk the tree and
1864 * find the matching one.
1865 */
1866static struct rb_node **fuse_find_polled_node(struct fuse_conn *fc, u64 kh,
1867 struct rb_node **parent_out)
1868{
1869 struct rb_node **link = &fc->polled_files.rb_node;
1870 struct rb_node *last = NULL;
1871
1872 while (*link) {
1873 struct fuse_file *ff;
1874
1875 last = *link;
1876 ff = rb_entry(last, struct fuse_file, polled_node);
1877
1878 if (kh < ff->kh)
1879 link = &last->rb_left;
1880 else if (kh > ff->kh)
1881 link = &last->rb_right;
1882 else
1883 return link;
1884 }
1885
1886 if (parent_out)
1887 *parent_out = last;
1888 return link;
1889}
1890
1891/*
1892 * The file is about to be polled. Make sure it's on the polled_files
1893 * RB tree. Note that files once added to the polled_files tree are
1894 * not removed before the file is released. This is because a file
1895 * polled once is likely to be polled again.
1896 */
1897static void fuse_register_polled_file(struct fuse_conn *fc,
1898 struct fuse_file *ff)
1899{
1900 spin_lock(&fc->lock);
1901 if (RB_EMPTY_NODE(&ff->polled_node)) {
1902 struct rb_node **link, *parent;
1903
1904 link = fuse_find_polled_node(fc, ff->kh, &parent);
1905 BUG_ON(*link);
1906 rb_link_node(&ff->polled_node, parent, link);
1907 rb_insert_color(&ff->polled_node, &fc->polled_files);
1908 }
1909 spin_unlock(&fc->lock);
1910}
1911
Tejun Heo08cbf542009-04-14 10:54:53 +09001912unsigned fuse_file_poll(struct file *file, poll_table *wait)
Tejun Heo95668a62008-11-26 12:03:55 +01001913{
Tejun Heo95668a62008-11-26 12:03:55 +01001914 struct fuse_file *ff = file->private_data;
Miklos Szeredi797759a2009-04-28 16:56:41 +02001915 struct fuse_conn *fc = ff->fc;
Tejun Heo95668a62008-11-26 12:03:55 +01001916 struct fuse_poll_in inarg = { .fh = ff->fh, .kh = ff->kh };
1917 struct fuse_poll_out outarg;
1918 struct fuse_req *req;
1919 int err;
1920
1921 if (fc->no_poll)
1922 return DEFAULT_POLLMASK;
1923
1924 poll_wait(file, &ff->poll_wait, wait);
1925
1926 /*
1927 * Ask for notification iff there's someone waiting for it.
1928 * The client may ignore the flag and always notify.
1929 */
1930 if (waitqueue_active(&ff->poll_wait)) {
1931 inarg.flags |= FUSE_POLL_SCHEDULE_NOTIFY;
1932 fuse_register_polled_file(fc, ff);
1933 }
1934
1935 req = fuse_get_req(fc);
1936 if (IS_ERR(req))
Miklos Szeredi201fa692009-06-30 20:06:24 +02001937 return POLLERR;
Tejun Heo95668a62008-11-26 12:03:55 +01001938
1939 req->in.h.opcode = FUSE_POLL;
Miklos Szeredi797759a2009-04-28 16:56:41 +02001940 req->in.h.nodeid = ff->nodeid;
Tejun Heo95668a62008-11-26 12:03:55 +01001941 req->in.numargs = 1;
1942 req->in.args[0].size = sizeof(inarg);
1943 req->in.args[0].value = &inarg;
1944 req->out.numargs = 1;
1945 req->out.args[0].size = sizeof(outarg);
1946 req->out.args[0].value = &outarg;
Tejun Heob93f8582008-11-26 12:03:55 +01001947 fuse_request_send(fc, req);
Tejun Heo95668a62008-11-26 12:03:55 +01001948 err = req->out.h.error;
1949 fuse_put_request(fc, req);
1950
1951 if (!err)
1952 return outarg.revents;
1953 if (err == -ENOSYS) {
1954 fc->no_poll = 1;
1955 return DEFAULT_POLLMASK;
1956 }
1957 return POLLERR;
1958}
Tejun Heo08cbf542009-04-14 10:54:53 +09001959EXPORT_SYMBOL_GPL(fuse_file_poll);
Tejun Heo95668a62008-11-26 12:03:55 +01001960
1961/*
1962 * This is called from fuse_handle_notify() on FUSE_NOTIFY_POLL and
1963 * wakes up the poll waiters.
1964 */
1965int fuse_notify_poll_wakeup(struct fuse_conn *fc,
1966 struct fuse_notify_poll_wakeup_out *outarg)
1967{
1968 u64 kh = outarg->kh;
1969 struct rb_node **link;
1970
1971 spin_lock(&fc->lock);
1972
1973 link = fuse_find_polled_node(fc, kh, NULL);
1974 if (*link) {
1975 struct fuse_file *ff;
1976
1977 ff = rb_entry(*link, struct fuse_file, polled_node);
1978 wake_up_interruptible_sync(&ff->poll_wait);
1979 }
1980
1981 spin_unlock(&fc->lock);
1982 return 0;
1983}
1984
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -08001985static const struct file_operations fuse_file_operations = {
Miklos Szeredi5559b8f2008-04-30 00:54:45 -07001986 .llseek = fuse_file_llseek,
Badari Pulavarty543ade12006-09-30 23:28:48 -07001987 .read = do_sync_read,
Miklos Szeredibcb4be82007-11-28 16:21:59 -08001988 .aio_read = fuse_file_aio_read,
Badari Pulavarty543ade12006-09-30 23:28:48 -07001989 .write = do_sync_write,
Nick Pigginea9b9902008-04-30 00:54:42 -07001990 .aio_write = fuse_file_aio_write,
Miklos Szeredib6aeade2005-09-09 13:10:30 -07001991 .mmap = fuse_file_mmap,
1992 .open = fuse_open,
1993 .flush = fuse_flush,
1994 .release = fuse_release,
1995 .fsync = fuse_fsync,
Miklos Szeredi71421252006-06-25 05:48:52 -07001996 .lock = fuse_file_lock,
Miklos Szeredia9ff4f82007-10-18 03:07:02 -07001997 .flock = fuse_file_flock,
Jens Axboe5ffc4ef2007-06-01 11:49:19 +02001998 .splice_read = generic_file_splice_read,
Tejun Heo59efec72008-11-26 12:03:55 +01001999 .unlocked_ioctl = fuse_file_ioctl,
2000 .compat_ioctl = fuse_file_compat_ioctl,
Tejun Heo95668a62008-11-26 12:03:55 +01002001 .poll = fuse_file_poll,
Miklos Szeredib6aeade2005-09-09 13:10:30 -07002002};
2003
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -08002004static const struct file_operations fuse_direct_io_file_operations = {
Miklos Szeredi5559b8f2008-04-30 00:54:45 -07002005 .llseek = fuse_file_llseek,
Miklos Szeredi413ef8c2005-09-09 13:10:35 -07002006 .read = fuse_direct_read,
2007 .write = fuse_direct_write,
Miklos Szeredifc280c92009-04-02 14:25:35 +02002008 .mmap = fuse_direct_mmap,
Miklos Szeredi413ef8c2005-09-09 13:10:35 -07002009 .open = fuse_open,
2010 .flush = fuse_flush,
2011 .release = fuse_release,
2012 .fsync = fuse_fsync,
Miklos Szeredi71421252006-06-25 05:48:52 -07002013 .lock = fuse_file_lock,
Miklos Szeredia9ff4f82007-10-18 03:07:02 -07002014 .flock = fuse_file_flock,
Tejun Heo59efec72008-11-26 12:03:55 +01002015 .unlocked_ioctl = fuse_file_ioctl,
2016 .compat_ioctl = fuse_file_compat_ioctl,
Tejun Heo95668a62008-11-26 12:03:55 +01002017 .poll = fuse_file_poll,
Miklos Szeredifc280c92009-04-02 14:25:35 +02002018 /* no splice_read */
Miklos Szeredi413ef8c2005-09-09 13:10:35 -07002019};
2020
Christoph Hellwigf5e54d62006-06-28 04:26:44 -07002021static const struct address_space_operations fuse_file_aops = {
Miklos Szeredib6aeade2005-09-09 13:10:30 -07002022 .readpage = fuse_readpage,
Miklos Szeredi3be5a522008-04-30 00:54:41 -07002023 .writepage = fuse_writepage,
2024 .launder_page = fuse_launder_page,
Nick Piggin5e6f58a2007-10-16 01:25:17 -07002025 .write_begin = fuse_write_begin,
2026 .write_end = fuse_write_end,
Miklos Szeredidb50b962005-09-09 13:10:33 -07002027 .readpages = fuse_readpages,
Miklos Szeredi3be5a522008-04-30 00:54:41 -07002028 .set_page_dirty = __set_page_dirty_nobuffers,
Miklos Szeredib2d22722006-12-06 20:35:51 -08002029 .bmap = fuse_bmap,
Miklos Szeredib6aeade2005-09-09 13:10:30 -07002030};
2031
2032void fuse_init_file_inode(struct inode *inode)
2033{
Miklos Szeredi45323fb2005-09-09 13:10:37 -07002034 inode->i_fop = &fuse_file_operations;
2035 inode->i_data.a_ops = &fuse_file_aops;
Miklos Szeredib6aeade2005-09-09 13:10:30 -07002036}