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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 Szeredid9d318d2010-11-30 16:39:27 +010016#include <linux/compat.h>
Johannes Weiner478e0842011-07-25 22:35:35 +020017#include <linux/swap.h>
Miklos Szeredib6aeade2005-09-09 13:10:30 -070018
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -080019static const struct file_operations fuse_direct_io_file_operations;
Miklos Szeredi45323fb2005-09-09 13:10:37 -070020
Miklos Szeredi91fe96b2009-04-28 16:56:37 +020021static int fuse_send_open(struct fuse_conn *fc, u64 nodeid, struct file *file,
22 int opcode, struct fuse_open_out *outargp)
Miklos Szeredib6aeade2005-09-09 13:10:30 -070023{
Miklos Szeredib6aeade2005-09-09 13:10:30 -070024 struct fuse_open_in inarg;
Miklos Szeredifd72faa2005-11-07 00:59:51 -080025 struct fuse_req *req;
26 int err;
27
Miklos Szeredice1d5a42006-04-10 22:54:58 -070028 req = fuse_get_req(fc);
29 if (IS_ERR(req))
30 return PTR_ERR(req);
Miklos Szeredifd72faa2005-11-07 00:59:51 -080031
32 memset(&inarg, 0, sizeof(inarg));
Miklos Szeredi6ff958e2007-10-18 03:07:02 -070033 inarg.flags = file->f_flags & ~(O_CREAT | O_EXCL | O_NOCTTY);
34 if (!fc->atomic_o_trunc)
35 inarg.flags &= ~O_TRUNC;
Miklos Szeredi91fe96b2009-04-28 16:56:37 +020036 req->in.h.opcode = opcode;
37 req->in.h.nodeid = nodeid;
Miklos Szeredifd72faa2005-11-07 00:59:51 -080038 req->in.numargs = 1;
39 req->in.args[0].size = sizeof(inarg);
40 req->in.args[0].value = &inarg;
41 req->out.numargs = 1;
42 req->out.args[0].size = sizeof(*outargp);
43 req->out.args[0].value = outargp;
Tejun Heob93f8582008-11-26 12:03:55 +010044 fuse_request_send(fc, req);
Miklos Szeredifd72faa2005-11-07 00:59:51 -080045 err = req->out.h.error;
46 fuse_put_request(fc, req);
47
48 return err;
49}
50
Tejun Heoacf99432008-11-26 12:03:55 +010051struct fuse_file *fuse_file_alloc(struct fuse_conn *fc)
Miklos Szeredifd72faa2005-11-07 00:59:51 -080052{
53 struct fuse_file *ff;
Tejun Heo6b2db282009-04-14 10:54:49 +090054
Miklos Szeredifd72faa2005-11-07 00:59:51 -080055 ff = kmalloc(sizeof(struct fuse_file), GFP_KERNEL);
Tejun Heo6b2db282009-04-14 10:54:49 +090056 if (unlikely(!ff))
57 return NULL;
58
Miklos Szeredida5e4712009-04-28 16:56:36 +020059 ff->fc = fc;
Tejun Heo6b2db282009-04-14 10:54:49 +090060 ff->reserved_req = fuse_request_alloc();
61 if (unlikely(!ff->reserved_req)) {
62 kfree(ff);
63 return NULL;
Miklos Szeredifd72faa2005-11-07 00:59:51 -080064 }
Tejun Heo6b2db282009-04-14 10:54:49 +090065
66 INIT_LIST_HEAD(&ff->write_entry);
67 atomic_set(&ff->count, 0);
68 RB_CLEAR_NODE(&ff->polled_node);
69 init_waitqueue_head(&ff->poll_wait);
70
71 spin_lock(&fc->lock);
72 ff->kh = ++fc->khctr;
73 spin_unlock(&fc->lock);
74
Miklos Szeredifd72faa2005-11-07 00:59:51 -080075 return ff;
76}
77
78void fuse_file_free(struct fuse_file *ff)
79{
Miklos Szeredi33649c92006-06-25 05:48:52 -070080 fuse_request_free(ff->reserved_req);
Miklos Szeredifd72faa2005-11-07 00:59:51 -080081 kfree(ff);
82}
83
Miklos Szeredic7b71432009-04-28 16:56:37 +020084struct fuse_file *fuse_file_get(struct fuse_file *ff)
Miklos Szeredic756e0a2007-10-16 23:31:00 -070085{
86 atomic_inc(&ff->count);
87 return ff;
88}
89
Miklos Szeredi5a18ec12011-02-25 14:44:58 +010090static void fuse_release_async(struct work_struct *work)
Miklos Szeredi819c4b32007-10-16 23:31:04 -070091{
Miklos Szeredi5a18ec12011-02-25 14:44:58 +010092 struct fuse_req *req;
93 struct fuse_conn *fc;
94 struct path path;
95
96 req = container_of(work, struct fuse_req, misc.release.work);
97 path = req->misc.release.path;
98 fc = get_fuse_conn(path.dentry->d_inode);
99
100 fuse_put_request(fc, req);
101 path_put(&path);
Miklos Szeredi819c4b32007-10-16 23:31:04 -0700102}
103
Miklos Szeredi5a18ec12011-02-25 14:44:58 +0100104static void fuse_release_end(struct fuse_conn *fc, struct fuse_req *req)
105{
106 if (fc->destroy_req) {
107 /*
108 * If this is a fuseblk mount, then it's possible that
109 * releasing the path will result in releasing the
110 * super block and sending the DESTROY request. If
111 * the server is single threaded, this would hang.
112 * For this reason do the path_put() in a separate
113 * thread.
114 */
115 atomic_inc(&req->count);
116 INIT_WORK(&req->misc.release.work, fuse_release_async);
117 schedule_work(&req->misc.release.work);
118 } else {
119 path_put(&req->misc.release.path);
120 }
121}
122
123static void fuse_file_put(struct fuse_file *ff, bool sync)
Miklos Szeredic756e0a2007-10-16 23:31:00 -0700124{
125 if (atomic_dec_and_test(&ff->count)) {
126 struct fuse_req *req = ff->reserved_req;
Miklos Szeredi8b0797a2009-04-28 16:56:39 +0200127
Miklos Szeredi5a18ec12011-02-25 14:44:58 +0100128 if (sync) {
129 fuse_request_send(ff->fc, req);
130 path_put(&req->misc.release.path);
131 fuse_put_request(ff->fc, req);
132 } else {
133 req->end = fuse_release_end;
134 fuse_request_send_background(ff->fc, req);
135 }
Miklos Szeredic756e0a2007-10-16 23:31:00 -0700136 kfree(ff);
137 }
138}
139
Tejun Heo08cbf542009-04-14 10:54:53 +0900140int fuse_do_open(struct fuse_conn *fc, u64 nodeid, struct file *file,
141 bool isdir)
Miklos Szeredi91fe96b2009-04-28 16:56:37 +0200142{
143 struct fuse_open_out outarg;
144 struct fuse_file *ff;
145 int err;
146 int opcode = isdir ? FUSE_OPENDIR : FUSE_OPEN;
147
148 ff = fuse_file_alloc(fc);
149 if (!ff)
150 return -ENOMEM;
151
152 err = fuse_send_open(fc, nodeid, file, opcode, &outarg);
153 if (err) {
154 fuse_file_free(ff);
155 return err;
156 }
157
158 if (isdir)
159 outarg.open_flags &= ~FOPEN_DIRECT_IO;
160
161 ff->fh = outarg.fh;
162 ff->nodeid = nodeid;
163 ff->open_flags = outarg.open_flags;
164 file->private_data = fuse_file_get(ff);
165
166 return 0;
167}
Tejun Heo08cbf542009-04-14 10:54:53 +0900168EXPORT_SYMBOL_GPL(fuse_do_open);
Miklos Szeredi91fe96b2009-04-28 16:56:37 +0200169
Miklos Szeredic7b71432009-04-28 16:56:37 +0200170void fuse_finish_open(struct inode *inode, struct file *file)
Miklos Szeredifd72faa2005-11-07 00:59:51 -0800171{
Miklos Szeredic7b71432009-04-28 16:56:37 +0200172 struct fuse_file *ff = file->private_data;
Ken Sumralla0822c52010-11-24 12:57:00 -0800173 struct fuse_conn *fc = get_fuse_conn(inode);
Miklos Szeredic7b71432009-04-28 16:56:37 +0200174
175 if (ff->open_flags & FOPEN_DIRECT_IO)
Miklos Szeredifd72faa2005-11-07 00:59:51 -0800176 file->f_op = &fuse_direct_io_file_operations;
Miklos Szeredic7b71432009-04-28 16:56:37 +0200177 if (!(ff->open_flags & FOPEN_KEEP_CACHE))
Miklos Szeredib1009972007-10-16 23:31:01 -0700178 invalidate_inode_pages2(inode->i_mapping);
Miklos Szeredic7b71432009-04-28 16:56:37 +0200179 if (ff->open_flags & FOPEN_NONSEEKABLE)
Tejun Heoa7c1b992008-10-16 16:08:57 +0200180 nonseekable_open(inode, file);
Ken Sumralla0822c52010-11-24 12:57:00 -0800181 if (fc->atomic_o_trunc && (file->f_flags & O_TRUNC)) {
182 struct fuse_inode *fi = get_fuse_inode(inode);
183
184 spin_lock(&fc->lock);
185 fi->attr_version = ++fc->attr_version;
186 i_size_write(inode, 0);
187 spin_unlock(&fc->lock);
188 fuse_invalidate_attr(inode);
189 }
Miklos Szeredifd72faa2005-11-07 00:59:51 -0800190}
191
Miklos Szeredi91fe96b2009-04-28 16:56:37 +0200192int fuse_open_common(struct inode *inode, struct file *file, bool isdir)
Miklos Szeredifd72faa2005-11-07 00:59:51 -0800193{
Tejun Heoacf99432008-11-26 12:03:55 +0100194 struct fuse_conn *fc = get_fuse_conn(inode);
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700195 int err;
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700196
Miklos Szeredidd190d02005-09-30 11:59:02 -0700197 /* VFS checks this, but only _after_ ->open() */
198 if (file->f_flags & O_DIRECT)
199 return -EINVAL;
200
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700201 err = generic_file_open(inode, file);
202 if (err)
203 return err;
204
Miklos Szeredi91fe96b2009-04-28 16:56:37 +0200205 err = fuse_do_open(fc, get_node_id(inode), file, isdir);
Miklos Szeredifd72faa2005-11-07 00:59:51 -0800206 if (err)
Miklos Szeredi91fe96b2009-04-28 16:56:37 +0200207 return err;
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700208
Miklos Szeredi91fe96b2009-04-28 16:56:37 +0200209 fuse_finish_open(inode, file);
210
211 return 0;
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700212}
213
Miklos Szeredi8b0797a2009-04-28 16:56:39 +0200214static void fuse_prepare_release(struct fuse_file *ff, int flags, int opcode)
Miklos Szeredi64c6d8e2006-01-16 22:14:42 -0800215{
Miklos Szeredi8b0797a2009-04-28 16:56:39 +0200216 struct fuse_conn *fc = ff->fc;
Miklos Szeredi33649c92006-06-25 05:48:52 -0700217 struct fuse_req *req = ff->reserved_req;
Miklos Szeredib57d4262008-02-06 01:38:39 -0800218 struct fuse_release_in *inarg = &req->misc.release.in;
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700219
Miklos Szeredi8b0797a2009-04-28 16:56:39 +0200220 spin_lock(&fc->lock);
221 list_del(&ff->write_entry);
222 if (!RB_EMPTY_NODE(&ff->polled_node))
223 rb_erase(&ff->polled_node, &fc->polled_files);
224 spin_unlock(&fc->lock);
225
Bryan Green357ccf22011-03-01 16:43:52 -0800226 wake_up_interruptible_all(&ff->poll_wait);
Miklos Szeredi8b0797a2009-04-28 16:56:39 +0200227
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700228 inarg->fh = ff->fh;
Miklos Szeredifd72faa2005-11-07 00:59:51 -0800229 inarg->flags = flags;
Miklos Szeredi51eb01e2006-06-25 05:48:50 -0700230 req->in.h.opcode = opcode;
Miklos Szeredic7b71432009-04-28 16:56:37 +0200231 req->in.h.nodeid = ff->nodeid;
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700232 req->in.numargs = 1;
233 req->in.args[0].size = sizeof(struct fuse_release_in);
234 req->in.args[0].value = inarg;
Miklos Szeredifd72faa2005-11-07 00:59:51 -0800235}
236
Miklos Szeredi8b0797a2009-04-28 16:56:39 +0200237void fuse_release_common(struct file *file, int opcode)
Miklos Szeredifd72faa2005-11-07 00:59:51 -0800238{
Tejun Heo6b2db282009-04-14 10:54:49 +0900239 struct fuse_file *ff;
240 struct fuse_req *req;
Miklos Szeredi93a8c3c2007-10-18 03:07:03 -0700241
Tejun Heo6b2db282009-04-14 10:54:49 +0900242 ff = file->private_data;
243 if (unlikely(!ff))
Miklos Szeredi8b0797a2009-04-28 16:56:39 +0200244 return;
Miklos Szeredi51eb01e2006-06-25 05:48:50 -0700245
Tejun Heo6b2db282009-04-14 10:54:49 +0900246 req = ff->reserved_req;
Miklos Szeredi8b0797a2009-04-28 16:56:39 +0200247 fuse_prepare_release(ff, file->f_flags, opcode);
Tejun Heo95668a62008-11-26 12:03:55 +0100248
Miklos Szeredi37fb3a32011-08-08 16:08:08 +0200249 if (ff->flock) {
250 struct fuse_release_in *inarg = &req->misc.release.in;
251 inarg->release_flags |= FUSE_RELEASE_FLOCK_UNLOCK;
252 inarg->lock_owner = fuse_lock_owner_id(ff->fc,
253 (fl_owner_t) file);
254 }
Tejun Heo6b2db282009-04-14 10:54:49 +0900255 /* Hold vfsmount and dentry until release is finished */
Miklos Szeredib0be46e2009-04-28 16:56:36 +0200256 path_get(&file->f_path);
257 req->misc.release.path = file->f_path;
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700258
Tejun Heo6b2db282009-04-14 10:54:49 +0900259 /*
260 * Normally this will send the RELEASE request, however if
261 * some asynchronous READ or WRITE requests are outstanding,
262 * the sending will be delayed.
Miklos Szeredi5a18ec12011-02-25 14:44:58 +0100263 *
264 * Make the release synchronous if this is a fuseblk mount,
265 * synchronous RELEASE is allowed (and desirable) in this case
266 * because the server can be trusted not to screw up.
Tejun Heo6b2db282009-04-14 10:54:49 +0900267 */
Miklos Szeredi5a18ec12011-02-25 14:44:58 +0100268 fuse_file_put(ff, ff->fc->destroy_req != NULL);
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700269}
270
Miklos Szeredi04730fe2005-09-09 13:10:36 -0700271static int fuse_open(struct inode *inode, struct file *file)
272{
Miklos Szeredi91fe96b2009-04-28 16:56:37 +0200273 return fuse_open_common(inode, file, false);
Miklos Szeredi04730fe2005-09-09 13:10:36 -0700274}
275
276static int fuse_release(struct inode *inode, struct file *file)
277{
Miklos Szeredi8b0797a2009-04-28 16:56:39 +0200278 fuse_release_common(file, FUSE_RELEASE);
279
280 /* return value is ignored by VFS */
281 return 0;
282}
283
284void fuse_sync_release(struct fuse_file *ff, int flags)
285{
286 WARN_ON(atomic_read(&ff->count) > 1);
287 fuse_prepare_release(ff, flags, FUSE_RELEASE);
288 ff->reserved_req->force = 1;
289 fuse_request_send(ff->fc, ff->reserved_req);
290 fuse_put_request(ff->fc, ff->reserved_req);
291 kfree(ff);
Miklos Szeredi04730fe2005-09-09 13:10:36 -0700292}
Tejun Heo08cbf542009-04-14 10:54:53 +0900293EXPORT_SYMBOL_GPL(fuse_sync_release);
Miklos Szeredi04730fe2005-09-09 13:10:36 -0700294
Miklos Szeredi71421252006-06-25 05:48:52 -0700295/*
Miklos Szeredi9c8ef562006-06-25 05:48:55 -0700296 * Scramble the ID space with XTEA, so that the value of the files_struct
297 * pointer is not exposed to userspace.
Miklos Szeredi71421252006-06-25 05:48:52 -0700298 */
Miklos Szeredif3332112007-10-18 03:07:04 -0700299u64 fuse_lock_owner_id(struct fuse_conn *fc, fl_owner_t id)
Miklos Szeredi71421252006-06-25 05:48:52 -0700300{
Miklos Szeredi9c8ef562006-06-25 05:48:55 -0700301 u32 *k = fc->scramble_key;
302 u64 v = (unsigned long) id;
303 u32 v0 = v;
304 u32 v1 = v >> 32;
305 u32 sum = 0;
306 int i;
307
308 for (i = 0; i < 32; i++) {
309 v0 += ((v1 << 4 ^ v1 >> 5) + v1) ^ (sum + k[sum & 3]);
310 sum += 0x9E3779B9;
311 v1 += ((v0 << 4 ^ v0 >> 5) + v0) ^ (sum + k[sum>>11 & 3]);
312 }
313
314 return (u64) v0 + ((u64) v1 << 32);
Miklos Szeredi71421252006-06-25 05:48:52 -0700315}
316
Miklos Szeredi3be5a522008-04-30 00:54:41 -0700317/*
318 * Check if page is under writeback
319 *
320 * This is currently done by walking the list of writepage requests
321 * for the inode, which can be pretty inefficient.
322 */
323static bool fuse_page_is_writeback(struct inode *inode, pgoff_t index)
324{
325 struct fuse_conn *fc = get_fuse_conn(inode);
326 struct fuse_inode *fi = get_fuse_inode(inode);
327 struct fuse_req *req;
328 bool found = false;
329
330 spin_lock(&fc->lock);
331 list_for_each_entry(req, &fi->writepages, writepages_entry) {
332 pgoff_t curr_index;
333
334 BUG_ON(req->inode != inode);
335 curr_index = req->misc.write.in.offset >> PAGE_CACHE_SHIFT;
336 if (curr_index == index) {
337 found = true;
338 break;
339 }
340 }
341 spin_unlock(&fc->lock);
342
343 return found;
344}
345
346/*
347 * Wait for page writeback to be completed.
348 *
349 * Since fuse doesn't rely on the VM writeback tracking, this has to
350 * use some other means.
351 */
352static int fuse_wait_on_page_writeback(struct inode *inode, pgoff_t index)
353{
354 struct fuse_inode *fi = get_fuse_inode(inode);
355
356 wait_event(fi->page_waitq, !fuse_page_is_writeback(inode, index));
357 return 0;
358}
359
Miklos Szeredi75e1fcc2006-06-23 02:05:12 -0700360static int fuse_flush(struct file *file, fl_owner_t id)
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700361{
Josef Sipek7706a9d2006-12-08 02:37:02 -0800362 struct inode *inode = file->f_path.dentry->d_inode;
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700363 struct fuse_conn *fc = get_fuse_conn(inode);
364 struct fuse_file *ff = file->private_data;
365 struct fuse_req *req;
366 struct fuse_flush_in inarg;
367 int err;
368
Miklos Szeredi248d86e2006-01-06 00:19:39 -0800369 if (is_bad_inode(inode))
370 return -EIO;
371
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700372 if (fc->no_flush)
373 return 0;
374
Miklos Szeredi33649c92006-06-25 05:48:52 -0700375 req = fuse_get_req_nofail(fc, file);
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700376 memset(&inarg, 0, sizeof(inarg));
377 inarg.fh = ff->fh;
Miklos Szeredi9c8ef562006-06-25 05:48:55 -0700378 inarg.lock_owner = fuse_lock_owner_id(fc, id);
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700379 req->in.h.opcode = FUSE_FLUSH;
380 req->in.h.nodeid = get_node_id(inode);
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700381 req->in.numargs = 1;
382 req->in.args[0].size = sizeof(inarg);
383 req->in.args[0].value = &inarg;
Miklos Szeredi71421252006-06-25 05:48:52 -0700384 req->force = 1;
Tejun Heob93f8582008-11-26 12:03:55 +0100385 fuse_request_send(fc, req);
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700386 err = req->out.h.error;
387 fuse_put_request(fc, req);
388 if (err == -ENOSYS) {
389 fc->no_flush = 1;
390 err = 0;
391 }
392 return err;
393}
394
Miklos Szeredi3be5a522008-04-30 00:54:41 -0700395/*
396 * Wait for all pending writepages on the inode to finish.
397 *
398 * This is currently done by blocking further writes with FUSE_NOWRITE
399 * and waiting for all sent writes to complete.
400 *
401 * This must be called under i_mutex, otherwise the FUSE_NOWRITE usage
402 * could conflict with truncation.
403 */
404static void fuse_sync_writes(struct inode *inode)
405{
406 fuse_set_nowrite(inode);
407 fuse_release_nowrite(inode);
408}
409
Josef Bacik02c24a82011-07-16 20:44:56 -0400410int fuse_fsync_common(struct file *file, loff_t start, loff_t end,
411 int datasync, int isdir)
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700412{
Christoph Hellwig7ea80852010-05-26 17:53:25 +0200413 struct inode *inode = file->f_mapping->host;
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700414 struct fuse_conn *fc = get_fuse_conn(inode);
415 struct fuse_file *ff = file->private_data;
416 struct fuse_req *req;
417 struct fuse_fsync_in inarg;
418 int err;
419
Miklos Szeredi248d86e2006-01-06 00:19:39 -0800420 if (is_bad_inode(inode))
421 return -EIO;
422
Josef Bacik02c24a82011-07-16 20:44:56 -0400423 err = filemap_write_and_wait_range(inode->i_mapping, start, end);
424 if (err)
425 return err;
426
Miklos Szeredi82547982005-09-09 13:10:38 -0700427 if ((!isdir && fc->no_fsync) || (isdir && fc->no_fsyncdir))
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700428 return 0;
429
Josef Bacik02c24a82011-07-16 20:44:56 -0400430 mutex_lock(&inode->i_mutex);
431
Miklos Szeredi3be5a522008-04-30 00:54:41 -0700432 /*
433 * Start writeback against all dirty pages of the inode, then
434 * wait for all outstanding writes, before sending the FSYNC
435 * request.
436 */
437 err = write_inode_now(inode, 0);
438 if (err)
Josef Bacik02c24a82011-07-16 20:44:56 -0400439 goto out;
Miklos Szeredi3be5a522008-04-30 00:54:41 -0700440
441 fuse_sync_writes(inode);
442
Miklos Szeredice1d5a42006-04-10 22:54:58 -0700443 req = fuse_get_req(fc);
Josef Bacik02c24a82011-07-16 20:44:56 -0400444 if (IS_ERR(req)) {
445 err = PTR_ERR(req);
446 goto out;
447 }
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700448
449 memset(&inarg, 0, sizeof(inarg));
450 inarg.fh = ff->fh;
451 inarg.fsync_flags = datasync ? 1 : 0;
Miklos Szeredi82547982005-09-09 13:10:38 -0700452 req->in.h.opcode = isdir ? FUSE_FSYNCDIR : FUSE_FSYNC;
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700453 req->in.h.nodeid = get_node_id(inode);
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700454 req->in.numargs = 1;
455 req->in.args[0].size = sizeof(inarg);
456 req->in.args[0].value = &inarg;
Tejun Heob93f8582008-11-26 12:03:55 +0100457 fuse_request_send(fc, req);
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700458 err = req->out.h.error;
459 fuse_put_request(fc, req);
460 if (err == -ENOSYS) {
Miklos Szeredi82547982005-09-09 13:10:38 -0700461 if (isdir)
462 fc->no_fsyncdir = 1;
463 else
464 fc->no_fsync = 1;
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700465 err = 0;
466 }
Josef Bacik02c24a82011-07-16 20:44:56 -0400467out:
468 mutex_unlock(&inode->i_mutex);
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700469 return err;
470}
471
Josef Bacik02c24a82011-07-16 20:44:56 -0400472static int fuse_fsync(struct file *file, loff_t start, loff_t end,
473 int datasync)
Miklos Szeredi82547982005-09-09 13:10:38 -0700474{
Josef Bacik02c24a82011-07-16 20:44:56 -0400475 return fuse_fsync_common(file, start, end, datasync, 0);
Miklos Szeredi82547982005-09-09 13:10:38 -0700476}
477
Miklos Szeredi2106cb12009-04-28 16:56:37 +0200478void fuse_read_fill(struct fuse_req *req, struct file *file, loff_t pos,
479 size_t count, int opcode)
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700480{
Miklos Szeredi5c5c5e52008-04-30 00:54:43 -0700481 struct fuse_read_in *inarg = &req->misc.read.in;
Miklos Szeredia6643092007-11-28 16:22:00 -0800482 struct fuse_file *ff = file->private_data;
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700483
Miklos Szeredi361b1eb52006-01-16 22:14:45 -0800484 inarg->fh = ff->fh;
485 inarg->offset = pos;
486 inarg->size = count;
Miklos Szeredia6643092007-11-28 16:22:00 -0800487 inarg->flags = file->f_flags;
Miklos Szeredi361b1eb52006-01-16 22:14:45 -0800488 req->in.h.opcode = opcode;
Miklos Szeredi2106cb12009-04-28 16:56:37 +0200489 req->in.h.nodeid = ff->nodeid;
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700490 req->in.numargs = 1;
491 req->in.args[0].size = sizeof(struct fuse_read_in);
Miklos Szeredic1aa96a2006-01-16 22:14:46 -0800492 req->in.args[0].value = inarg;
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700493 req->out.argvar = 1;
494 req->out.numargs = 1;
495 req->out.args[0].size = count;
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700496}
497
Miklos Szeredi8bfc0162006-01-16 22:14:28 -0800498static size_t fuse_send_read(struct fuse_req *req, struct file *file,
Miklos Szeredi2106cb12009-04-28 16:56:37 +0200499 loff_t pos, size_t count, fl_owner_t owner)
Miklos Szeredi04730fe2005-09-09 13:10:36 -0700500{
Miklos Szeredi2106cb12009-04-28 16:56:37 +0200501 struct fuse_file *ff = file->private_data;
502 struct fuse_conn *fc = ff->fc;
Miklos Szeredif3332112007-10-18 03:07:04 -0700503
Miklos Szeredi2106cb12009-04-28 16:56:37 +0200504 fuse_read_fill(req, file, pos, count, FUSE_READ);
Miklos Szeredif3332112007-10-18 03:07:04 -0700505 if (owner != NULL) {
Miklos Szeredi5c5c5e52008-04-30 00:54:43 -0700506 struct fuse_read_in *inarg = &req->misc.read.in;
Miklos Szeredif3332112007-10-18 03:07:04 -0700507
508 inarg->read_flags |= FUSE_READ_LOCKOWNER;
509 inarg->lock_owner = fuse_lock_owner_id(fc, owner);
510 }
Tejun Heob93f8582008-11-26 12:03:55 +0100511 fuse_request_send(fc, req);
Miklos Szeredi361b1eb52006-01-16 22:14:45 -0800512 return req->out.args[0].size;
Miklos Szeredi04730fe2005-09-09 13:10:36 -0700513}
514
Miklos Szeredi5c5c5e52008-04-30 00:54:43 -0700515static void fuse_read_update_size(struct inode *inode, loff_t size,
516 u64 attr_ver)
517{
518 struct fuse_conn *fc = get_fuse_conn(inode);
519 struct fuse_inode *fi = get_fuse_inode(inode);
520
521 spin_lock(&fc->lock);
522 if (attr_ver == fi->attr_version && size < inode->i_size) {
523 fi->attr_version = ++fc->attr_version;
524 i_size_write(inode, size);
525 }
526 spin_unlock(&fc->lock);
527}
528
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700529static int fuse_readpage(struct file *file, struct page *page)
530{
531 struct inode *inode = page->mapping->host;
532 struct fuse_conn *fc = get_fuse_conn(inode);
Miklos Szeredi248d86e2006-01-06 00:19:39 -0800533 struct fuse_req *req;
Miklos Szeredi5c5c5e52008-04-30 00:54:43 -0700534 size_t num_read;
535 loff_t pos = page_offset(page);
536 size_t count = PAGE_CACHE_SIZE;
537 u64 attr_ver;
Miklos Szeredi248d86e2006-01-06 00:19:39 -0800538 int err;
539
540 err = -EIO;
541 if (is_bad_inode(inode))
542 goto out;
543
Miklos Szeredi3be5a522008-04-30 00:54:41 -0700544 /*
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300545 * Page writeback can extend beyond the lifetime of the
Miklos Szeredi3be5a522008-04-30 00:54:41 -0700546 * page-cache page, so make sure we read a properly synced
547 * page.
548 */
549 fuse_wait_on_page_writeback(inode, page->index);
550
Miklos Szeredice1d5a42006-04-10 22:54:58 -0700551 req = fuse_get_req(fc);
552 err = PTR_ERR(req);
553 if (IS_ERR(req))
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700554 goto out;
555
Miklos Szeredi5c5c5e52008-04-30 00:54:43 -0700556 attr_ver = fuse_get_attr_version(fc);
557
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700558 req->out.page_zeroing = 1;
Miklos Szeredif4975c62009-04-02 14:25:34 +0200559 req->out.argpages = 1;
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700560 req->num_pages = 1;
561 req->pages[0] = page;
Miklos Szeredi2106cb12009-04-28 16:56:37 +0200562 num_read = fuse_send_read(req, file, pos, count, NULL);
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700563 err = req->out.h.error;
564 fuse_put_request(fc, req);
Miklos Szeredi5c5c5e52008-04-30 00:54:43 -0700565
566 if (!err) {
567 /*
568 * Short read means EOF. If file size is larger, truncate it
569 */
570 if (num_read < count)
571 fuse_read_update_size(inode, pos + num_read, attr_ver);
572
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700573 SetPageUptodate(page);
Miklos Szeredi5c5c5e52008-04-30 00:54:43 -0700574 }
575
Miklos Szeredib36c31b2005-09-09 13:10:38 -0700576 fuse_invalidate_attr(inode); /* atime changed */
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700577 out:
578 unlock_page(page);
579 return err;
580}
581
Miklos Szeredic1aa96a2006-01-16 22:14:46 -0800582static void fuse_readpages_end(struct fuse_conn *fc, struct fuse_req *req)
Miklos Szeredidb50b962005-09-09 13:10:33 -0700583{
Miklos Szeredic1aa96a2006-01-16 22:14:46 -0800584 int i;
Miklos Szeredi5c5c5e52008-04-30 00:54:43 -0700585 size_t count = req->misc.read.in.size;
586 size_t num_read = req->out.args[0].size;
Miklos Szeredice534fb2010-05-25 15:06:07 +0200587 struct address_space *mapping = NULL;
Miklos Szeredic1aa96a2006-01-16 22:14:46 -0800588
Miklos Szeredice534fb2010-05-25 15:06:07 +0200589 for (i = 0; mapping == NULL && i < req->num_pages; i++)
590 mapping = req->pages[i]->mapping;
591
592 if (mapping) {
593 struct inode *inode = mapping->host;
594
595 /*
596 * Short read means EOF. If file size is larger, truncate it
597 */
598 if (!req->out.h.error && num_read < count) {
599 loff_t pos;
600
601 pos = page_offset(req->pages[0]) + num_read;
602 fuse_read_update_size(inode, pos,
603 req->misc.read.attr_ver);
604 }
605 fuse_invalidate_attr(inode); /* atime changed */
Miklos Szeredi5c5c5e52008-04-30 00:54:43 -0700606 }
607
Miklos Szeredidb50b962005-09-09 13:10:33 -0700608 for (i = 0; i < req->num_pages; i++) {
609 struct page *page = req->pages[i];
610 if (!req->out.h.error)
611 SetPageUptodate(page);
Miklos Szeredic1aa96a2006-01-16 22:14:46 -0800612 else
613 SetPageError(page);
Miklos Szeredidb50b962005-09-09 13:10:33 -0700614 unlock_page(page);
Miklos Szeredib5dd3282010-05-25 15:06:06 +0200615 page_cache_release(page);
Miklos Szeredidb50b962005-09-09 13:10:33 -0700616 }
Miklos Szeredic756e0a2007-10-16 23:31:00 -0700617 if (req->ff)
Miklos Szeredi5a18ec12011-02-25 14:44:58 +0100618 fuse_file_put(req->ff, false);
Miklos Szeredic1aa96a2006-01-16 22:14:46 -0800619}
620
Miklos Szeredi2106cb12009-04-28 16:56:37 +0200621static void fuse_send_readpages(struct fuse_req *req, struct file *file)
Miklos Szeredic1aa96a2006-01-16 22:14:46 -0800622{
Miklos Szeredi2106cb12009-04-28 16:56:37 +0200623 struct fuse_file *ff = file->private_data;
624 struct fuse_conn *fc = ff->fc;
Miklos Szeredic1aa96a2006-01-16 22:14:46 -0800625 loff_t pos = page_offset(req->pages[0]);
626 size_t count = req->num_pages << PAGE_CACHE_SHIFT;
Miklos Szeredif4975c62009-04-02 14:25:34 +0200627
628 req->out.argpages = 1;
Miklos Szeredic1aa96a2006-01-16 22:14:46 -0800629 req->out.page_zeroing = 1;
Miklos Szeredice534fb2010-05-25 15:06:07 +0200630 req->out.page_replace = 1;
Miklos Szeredi2106cb12009-04-28 16:56:37 +0200631 fuse_read_fill(req, file, pos, count, FUSE_READ);
Miklos Szeredi5c5c5e52008-04-30 00:54:43 -0700632 req->misc.read.attr_ver = fuse_get_attr_version(fc);
Miklos Szeredi9cd68452006-02-01 03:04:40 -0800633 if (fc->async_read) {
Miklos Szeredic756e0a2007-10-16 23:31:00 -0700634 req->ff = fuse_file_get(ff);
Miklos Szeredi9cd68452006-02-01 03:04:40 -0800635 req->end = fuse_readpages_end;
Tejun Heob93f8582008-11-26 12:03:55 +0100636 fuse_request_send_background(fc, req);
Miklos Szeredi9cd68452006-02-01 03:04:40 -0800637 } else {
Tejun Heob93f8582008-11-26 12:03:55 +0100638 fuse_request_send(fc, req);
Miklos Szeredi9cd68452006-02-01 03:04:40 -0800639 fuse_readpages_end(fc, req);
Tejun Heoe9bb09d2008-11-26 12:03:54 +0100640 fuse_put_request(fc, req);
Miklos Szeredi9cd68452006-02-01 03:04:40 -0800641 }
Miklos Szeredidb50b962005-09-09 13:10:33 -0700642}
643
Miklos Szeredic756e0a2007-10-16 23:31:00 -0700644struct fuse_fill_data {
Miklos Szeredidb50b962005-09-09 13:10:33 -0700645 struct fuse_req *req;
Miklos Szeredia6643092007-11-28 16:22:00 -0800646 struct file *file;
Miklos Szeredidb50b962005-09-09 13:10:33 -0700647 struct inode *inode;
648};
649
650static int fuse_readpages_fill(void *_data, struct page *page)
651{
Miklos Szeredic756e0a2007-10-16 23:31:00 -0700652 struct fuse_fill_data *data = _data;
Miklos Szeredidb50b962005-09-09 13:10:33 -0700653 struct fuse_req *req = data->req;
654 struct inode *inode = data->inode;
655 struct fuse_conn *fc = get_fuse_conn(inode);
656
Miklos Szeredi3be5a522008-04-30 00:54:41 -0700657 fuse_wait_on_page_writeback(inode, page->index);
658
Miklos Szeredidb50b962005-09-09 13:10:33 -0700659 if (req->num_pages &&
660 (req->num_pages == FUSE_MAX_PAGES_PER_REQ ||
661 (req->num_pages + 1) * PAGE_CACHE_SIZE > fc->max_read ||
662 req->pages[req->num_pages - 1]->index + 1 != page->index)) {
Miklos Szeredi2106cb12009-04-28 16:56:37 +0200663 fuse_send_readpages(req, data->file);
Miklos Szeredice1d5a42006-04-10 22:54:58 -0700664 data->req = req = fuse_get_req(fc);
665 if (IS_ERR(req)) {
Miklos Szeredidb50b962005-09-09 13:10:33 -0700666 unlock_page(page);
Miklos Szeredice1d5a42006-04-10 22:54:58 -0700667 return PTR_ERR(req);
Miklos Szeredidb50b962005-09-09 13:10:33 -0700668 }
Miklos Szeredidb50b962005-09-09 13:10:33 -0700669 }
Miklos Szeredib5dd3282010-05-25 15:06:06 +0200670 page_cache_get(page);
Miklos Szeredidb50b962005-09-09 13:10:33 -0700671 req->pages[req->num_pages] = page;
Miklos Szeredi1729a162008-11-26 12:03:54 +0100672 req->num_pages++;
Miklos Szeredidb50b962005-09-09 13:10:33 -0700673 return 0;
674}
675
676static int fuse_readpages(struct file *file, struct address_space *mapping,
677 struct list_head *pages, unsigned nr_pages)
678{
679 struct inode *inode = mapping->host;
680 struct fuse_conn *fc = get_fuse_conn(inode);
Miklos Szeredic756e0a2007-10-16 23:31:00 -0700681 struct fuse_fill_data data;
Miklos Szeredidb50b962005-09-09 13:10:33 -0700682 int err;
Miklos Szeredi248d86e2006-01-06 00:19:39 -0800683
Alexander Zarochentsev1d7ea732006-08-13 23:24:27 -0700684 err = -EIO;
Miklos Szeredi248d86e2006-01-06 00:19:39 -0800685 if (is_bad_inode(inode))
OGAWA Hirofumi2e990022006-11-02 22:07:09 -0800686 goto out;
Miklos Szeredi248d86e2006-01-06 00:19:39 -0800687
Miklos Szeredia6643092007-11-28 16:22:00 -0800688 data.file = file;
Miklos Szeredidb50b962005-09-09 13:10:33 -0700689 data.inode = inode;
Miklos Szeredice1d5a42006-04-10 22:54:58 -0700690 data.req = fuse_get_req(fc);
Alexander Zarochentsev1d7ea732006-08-13 23:24:27 -0700691 err = PTR_ERR(data.req);
Miklos Szeredice1d5a42006-04-10 22:54:58 -0700692 if (IS_ERR(data.req))
OGAWA Hirofumi2e990022006-11-02 22:07:09 -0800693 goto out;
Miklos Szeredidb50b962005-09-09 13:10:33 -0700694
695 err = read_cache_pages(mapping, pages, fuse_readpages_fill, &data);
Miklos Szeredid3406ff2006-04-10 22:54:49 -0700696 if (!err) {
697 if (data.req->num_pages)
Miklos Szeredi2106cb12009-04-28 16:56:37 +0200698 fuse_send_readpages(data.req, file);
Miklos Szeredid3406ff2006-04-10 22:54:49 -0700699 else
700 fuse_put_request(fc, data.req);
701 }
OGAWA Hirofumi2e990022006-11-02 22:07:09 -0800702out:
Alexander Zarochentsev1d7ea732006-08-13 23:24:27 -0700703 return err;
Miklos Szeredidb50b962005-09-09 13:10:33 -0700704}
705
Miklos Szeredibcb4be82007-11-28 16:21:59 -0800706static ssize_t fuse_file_aio_read(struct kiocb *iocb, const struct iovec *iov,
707 unsigned long nr_segs, loff_t pos)
708{
709 struct inode *inode = iocb->ki_filp->f_mapping->host;
710
711 if (pos + iov_length(iov, nr_segs) > i_size_read(inode)) {
712 int err;
713 /*
714 * If trying to read past EOF, make sure the i_size
715 * attribute is up-to-date.
716 */
717 err = fuse_update_attributes(inode, NULL, iocb->ki_filp, NULL);
718 if (err)
719 return err;
720 }
721
722 return generic_file_aio_read(iocb, iov, nr_segs, pos);
723}
724
Miklos Szeredi2d698b02009-04-28 16:56:36 +0200725static void fuse_write_fill(struct fuse_req *req, struct fuse_file *ff,
Miklos Szeredi2106cb12009-04-28 16:56:37 +0200726 loff_t pos, size_t count)
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700727{
Miklos Szeredib25e82e2007-10-18 03:07:03 -0700728 struct fuse_write_in *inarg = &req->misc.write.in;
729 struct fuse_write_out *outarg = &req->misc.write.out;
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700730
Miklos Szeredib25e82e2007-10-18 03:07:03 -0700731 inarg->fh = ff->fh;
732 inarg->offset = pos;
733 inarg->size = count;
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700734 req->in.h.opcode = FUSE_WRITE;
Miklos Szeredi2106cb12009-04-28 16:56:37 +0200735 req->in.h.nodeid = ff->nodeid;
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700736 req->in.numargs = 2;
Miklos Szeredi2106cb12009-04-28 16:56:37 +0200737 if (ff->fc->minor < 9)
Miklos Szeredif3332112007-10-18 03:07:04 -0700738 req->in.args[0].size = FUSE_COMPAT_WRITE_IN_SIZE;
739 else
740 req->in.args[0].size = sizeof(struct fuse_write_in);
Miklos Szeredib25e82e2007-10-18 03:07:03 -0700741 req->in.args[0].value = inarg;
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700742 req->in.args[1].size = count;
743 req->out.numargs = 1;
744 req->out.args[0].size = sizeof(struct fuse_write_out);
Miklos Szeredib25e82e2007-10-18 03:07:03 -0700745 req->out.args[0].value = outarg;
746}
747
748static size_t fuse_send_write(struct fuse_req *req, struct file *file,
Miklos Szeredi2106cb12009-04-28 16:56:37 +0200749 loff_t pos, size_t count, fl_owner_t owner)
Miklos Szeredib25e82e2007-10-18 03:07:03 -0700750{
Miklos Szeredi2106cb12009-04-28 16:56:37 +0200751 struct fuse_file *ff = file->private_data;
752 struct fuse_conn *fc = ff->fc;
Miklos Szeredi2d698b02009-04-28 16:56:36 +0200753 struct fuse_write_in *inarg = &req->misc.write.in;
754
Miklos Szeredi2106cb12009-04-28 16:56:37 +0200755 fuse_write_fill(req, ff, pos, count);
Miklos Szeredi2d698b02009-04-28 16:56:36 +0200756 inarg->flags = file->f_flags;
Miklos Szeredif3332112007-10-18 03:07:04 -0700757 if (owner != NULL) {
Miklos Szeredif3332112007-10-18 03:07:04 -0700758 inarg->write_flags |= FUSE_WRITE_LOCKOWNER;
759 inarg->lock_owner = fuse_lock_owner_id(fc, owner);
760 }
Tejun Heob93f8582008-11-26 12:03:55 +0100761 fuse_request_send(fc, req);
Miklos Szeredib25e82e2007-10-18 03:07:03 -0700762 return req->misc.write.out.size;
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700763}
764
Miklos Szeredia1d75f22010-07-12 14:41:40 +0200765void fuse_write_update_size(struct inode *inode, loff_t pos)
Miklos Szeredi854512e2008-04-30 00:54:41 -0700766{
767 struct fuse_conn *fc = get_fuse_conn(inode);
768 struct fuse_inode *fi = get_fuse_inode(inode);
769
770 spin_lock(&fc->lock);
771 fi->attr_version = ++fc->attr_version;
772 if (pos > inode->i_size)
773 i_size_write(inode, pos);
774 spin_unlock(&fc->lock);
775}
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
Johannes Weiner478e0842011-07-25 22:35:35 +0200850 mark_page_accessed(page);
851
Nick Pigginea9b9902008-04-30 00:54:42 -0700852 if (!tmp) {
853 unlock_page(page);
854 page_cache_release(page);
855 bytes = min(bytes, iov_iter_single_seg_count(ii));
856 goto again;
857 }
858
859 err = 0;
860 req->pages[req->num_pages] = page;
861 req->num_pages++;
862
863 iov_iter_advance(ii, tmp);
864 count += tmp;
865 pos += tmp;
866 offset += tmp;
867 if (offset == PAGE_CACHE_SIZE)
868 offset = 0;
869
Miklos Szeredi78bb6cb2008-05-12 14:02:32 -0700870 if (!fc->big_writes)
871 break;
Nick Pigginea9b9902008-04-30 00:54:42 -0700872 } while (iov_iter_count(ii) && count < fc->max_write &&
873 req->num_pages < FUSE_MAX_PAGES_PER_REQ && offset == 0);
874
875 return count > 0 ? count : err;
876}
877
878static ssize_t fuse_perform_write(struct file *file,
879 struct address_space *mapping,
880 struct iov_iter *ii, loff_t pos)
881{
882 struct inode *inode = mapping->host;
883 struct fuse_conn *fc = get_fuse_conn(inode);
884 int err = 0;
885 ssize_t res = 0;
886
887 if (is_bad_inode(inode))
888 return -EIO;
889
890 do {
891 struct fuse_req *req;
892 ssize_t count;
893
894 req = fuse_get_req(fc);
895 if (IS_ERR(req)) {
896 err = PTR_ERR(req);
897 break;
898 }
899
900 count = fuse_fill_write_pages(req, mapping, ii, pos);
901 if (count <= 0) {
902 err = count;
903 } else {
904 size_t num_written;
905
906 num_written = fuse_send_write_pages(req, file, inode,
907 pos, count);
908 err = req->out.h.error;
909 if (!err) {
910 res += num_written;
911 pos += num_written;
912
913 /* break out of the loop on short write */
914 if (num_written != count)
915 err = -EIO;
916 }
917 }
918 fuse_put_request(fc, req);
919 } while (!err && iov_iter_count(ii));
920
921 if (res > 0)
922 fuse_write_update_size(inode, pos);
923
924 fuse_invalidate_attr(inode);
925
926 return res > 0 ? res : err;
927}
928
929static ssize_t fuse_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
930 unsigned long nr_segs, loff_t pos)
931{
932 struct file *file = iocb->ki_filp;
933 struct address_space *mapping = file->f_mapping;
934 size_t count = 0;
935 ssize_t written = 0;
936 struct inode *inode = mapping->host;
937 ssize_t err;
938 struct iov_iter i;
939
940 WARN_ON(iocb->ki_pos != pos);
941
942 err = generic_segment_checks(iov, &nr_segs, &count, VERIFY_READ);
943 if (err)
944 return err;
945
946 mutex_lock(&inode->i_mutex);
947 vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE);
948
949 /* We can write back this queue in page reclaim */
950 current->backing_dev_info = mapping->backing_dev_info;
951
952 err = generic_write_checks(file, &pos, &count, S_ISBLK(inode->i_mode));
953 if (err)
954 goto out;
955
956 if (count == 0)
957 goto out;
958
Miklos Szeredi2f1936b2008-06-24 16:50:14 +0200959 err = file_remove_suid(file);
Nick Pigginea9b9902008-04-30 00:54:42 -0700960 if (err)
961 goto out;
962
963 file_update_time(file);
964
965 iov_iter_init(&i, iov, nr_segs, count, 0);
966 written = fuse_perform_write(file, mapping, &i, pos);
967 if (written >= 0)
968 iocb->ki_pos = pos + written;
969
970out:
971 current->backing_dev_info = NULL;
972 mutex_unlock(&inode->i_mutex);
973
974 return written ? written : err;
975}
976
Miklos Szeredi413ef8c2005-09-09 13:10:35 -0700977static void fuse_release_user_pages(struct fuse_req *req, int write)
978{
979 unsigned i;
980
981 for (i = 0; i < req->num_pages; i++) {
982 struct page *page = req->pages[i];
983 if (write)
984 set_page_dirty_lock(page);
985 put_page(page);
986 }
987}
988
989static int fuse_get_user_pages(struct fuse_req *req, const char __user *buf,
Miklos Szeredice60a2f2009-04-09 17:37:52 +0200990 size_t *nbytesp, int write)
Miklos Szeredi413ef8c2005-09-09 13:10:35 -0700991{
Miklos Szeredice60a2f2009-04-09 17:37:52 +0200992 size_t nbytes = *nbytesp;
Miklos Szeredi413ef8c2005-09-09 13:10:35 -0700993 unsigned long user_addr = (unsigned long) buf;
994 unsigned offset = user_addr & ~PAGE_MASK;
995 int npages;
996
Miklos Szeredif4975c62009-04-02 14:25:34 +0200997 /* Special case for kernel I/O: can copy directly into the buffer */
998 if (segment_eq(get_fs(), KERNEL_DS)) {
999 if (write)
1000 req->in.args[1].value = (void *) user_addr;
1001 else
1002 req->out.args[0].value = (void *) user_addr;
1003
1004 return 0;
1005 }
Miklos Szeredi413ef8c2005-09-09 13:10:35 -07001006
Miklos Szeredice60a2f2009-04-09 17:37:52 +02001007 nbytes = min_t(size_t, nbytes, FUSE_MAX_PAGES_PER_REQ << PAGE_SHIFT);
Miklos Szeredi413ef8c2005-09-09 13:10:35 -07001008 npages = (nbytes + offset + PAGE_SIZE - 1) >> PAGE_SHIFT;
Harvey Harrisonbd730962008-05-01 04:35:15 -07001009 npages = clamp(npages, 1, FUSE_MAX_PAGES_PER_REQ);
Miklos Szeredi1bf94ca2010-05-25 15:06:06 +02001010 npages = get_user_pages_fast(user_addr, npages, !write, req->pages);
Miklos Szeredi413ef8c2005-09-09 13:10:35 -07001011 if (npages < 0)
1012 return npages;
1013
1014 req->num_pages = npages;
1015 req->page_offset = offset;
Miklos Szeredif4975c62009-04-02 14:25:34 +02001016
1017 if (write)
1018 req->in.argpages = 1;
1019 else
1020 req->out.argpages = 1;
1021
1022 nbytes = (req->num_pages << PAGE_SHIFT) - req->page_offset;
1023 *nbytesp = min(*nbytesp, nbytes);
1024
Miklos Szeredi413ef8c2005-09-09 13:10:35 -07001025 return 0;
1026}
1027
Tejun Heo08cbf542009-04-14 10:54:53 +09001028ssize_t fuse_direct_io(struct file *file, const char __user *buf,
1029 size_t count, loff_t *ppos, int write)
Miklos Szeredi413ef8c2005-09-09 13:10:35 -07001030{
Miklos Szeredi2106cb12009-04-28 16:56:37 +02001031 struct fuse_file *ff = file->private_data;
1032 struct fuse_conn *fc = ff->fc;
Miklos Szeredi413ef8c2005-09-09 13:10:35 -07001033 size_t nmax = write ? fc->max_write : fc->max_read;
1034 loff_t pos = *ppos;
1035 ssize_t res = 0;
Miklos Szeredi248d86e2006-01-06 00:19:39 -08001036 struct fuse_req *req;
1037
Miklos Szeredice1d5a42006-04-10 22:54:58 -07001038 req = fuse_get_req(fc);
1039 if (IS_ERR(req))
1040 return PTR_ERR(req);
Miklos Szeredi413ef8c2005-09-09 13:10:35 -07001041
1042 while (count) {
Miklos Szeredi413ef8c2005-09-09 13:10:35 -07001043 size_t nres;
Miklos Szeredi2106cb12009-04-28 16:56:37 +02001044 fl_owner_t owner = current->files;
Miklos Szeredif4975c62009-04-02 14:25:34 +02001045 size_t nbytes = min(count, nmax);
1046 int err = fuse_get_user_pages(req, buf, &nbytes, write);
Miklos Szeredi413ef8c2005-09-09 13:10:35 -07001047 if (err) {
1048 res = err;
1049 break;
1050 }
Miklos Szeredif4975c62009-04-02 14:25:34 +02001051
Miklos Szeredi413ef8c2005-09-09 13:10:35 -07001052 if (write)
Miklos Szeredi2106cb12009-04-28 16:56:37 +02001053 nres = fuse_send_write(req, file, pos, nbytes, owner);
Miklos Szeredi413ef8c2005-09-09 13:10:35 -07001054 else
Miklos Szeredi2106cb12009-04-28 16:56:37 +02001055 nres = fuse_send_read(req, file, pos, nbytes, owner);
1056
Miklos Szeredi413ef8c2005-09-09 13:10:35 -07001057 fuse_release_user_pages(req, !write);
1058 if (req->out.h.error) {
1059 if (!res)
1060 res = req->out.h.error;
1061 break;
1062 } else if (nres > nbytes) {
1063 res = -EIO;
1064 break;
1065 }
1066 count -= nres;
1067 res += nres;
1068 pos += nres;
1069 buf += nres;
1070 if (nres != nbytes)
1071 break;
Miklos Szeredi56cf34f2006-04-11 21:16:51 +02001072 if (count) {
1073 fuse_put_request(fc, req);
1074 req = fuse_get_req(fc);
1075 if (IS_ERR(req))
1076 break;
1077 }
Miklos Szeredi413ef8c2005-09-09 13:10:35 -07001078 }
Anand V. Avatif60311d2009-10-22 06:24:52 -07001079 if (!IS_ERR(req))
1080 fuse_put_request(fc, req);
Miklos Szeredid09cb9d2009-04-28 16:56:36 +02001081 if (res > 0)
Miklos Szeredi413ef8c2005-09-09 13:10:35 -07001082 *ppos = pos;
Miklos Szeredi413ef8c2005-09-09 13:10:35 -07001083
1084 return res;
1085}
Tejun Heo08cbf542009-04-14 10:54:53 +09001086EXPORT_SYMBOL_GPL(fuse_direct_io);
Miklos Szeredi413ef8c2005-09-09 13:10:35 -07001087
1088static ssize_t fuse_direct_read(struct file *file, char __user *buf,
1089 size_t count, loff_t *ppos)
1090{
Miklos Szeredid09cb9d2009-04-28 16:56:36 +02001091 ssize_t res;
1092 struct inode *inode = file->f_path.dentry->d_inode;
1093
1094 if (is_bad_inode(inode))
1095 return -EIO;
1096
1097 res = fuse_direct_io(file, buf, count, ppos, 0);
1098
1099 fuse_invalidate_attr(inode);
1100
1101 return res;
Miklos Szeredi413ef8c2005-09-09 13:10:35 -07001102}
1103
1104static ssize_t fuse_direct_write(struct file *file, const char __user *buf,
1105 size_t count, loff_t *ppos)
1106{
Josef Sipek7706a9d2006-12-08 02:37:02 -08001107 struct inode *inode = file->f_path.dentry->d_inode;
Miklos Szeredi413ef8c2005-09-09 13:10:35 -07001108 ssize_t res;
Miklos Szeredid09cb9d2009-04-28 16:56:36 +02001109
1110 if (is_bad_inode(inode))
1111 return -EIO;
1112
Miklos Szeredi413ef8c2005-09-09 13:10:35 -07001113 /* Don't allow parallel writes to the same file */
Jes Sorensen1b1dcc12006-01-09 15:59:24 -08001114 mutex_lock(&inode->i_mutex);
Miklos Szeredi889f7842007-05-23 13:57:54 -07001115 res = generic_write_checks(file, ppos, &count, 0);
Miklos Szeredid09cb9d2009-04-28 16:56:36 +02001116 if (!res) {
Miklos Szeredi889f7842007-05-23 13:57:54 -07001117 res = fuse_direct_io(file, buf, count, ppos, 1);
Miklos Szeredid09cb9d2009-04-28 16:56:36 +02001118 if (res > 0)
1119 fuse_write_update_size(inode, *ppos);
1120 }
Jes Sorensen1b1dcc12006-01-09 15:59:24 -08001121 mutex_unlock(&inode->i_mutex);
Miklos Szeredid09cb9d2009-04-28 16:56:36 +02001122
1123 fuse_invalidate_attr(inode);
1124
Miklos Szeredi413ef8c2005-09-09 13:10:35 -07001125 return res;
1126}
1127
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001128static void fuse_writepage_free(struct fuse_conn *fc, struct fuse_req *req)
Miklos Szeredib6aeade2005-09-09 13:10:30 -07001129{
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001130 __free_page(req->pages[0]);
Miklos Szeredi5a18ec12011-02-25 14:44:58 +01001131 fuse_file_put(req->ff, false);
Miklos Szeredib6aeade2005-09-09 13:10:30 -07001132}
1133
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001134static void fuse_writepage_finish(struct fuse_conn *fc, struct fuse_req *req)
Miklos Szeredib6aeade2005-09-09 13:10:30 -07001135{
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001136 struct inode *inode = req->inode;
1137 struct fuse_inode *fi = get_fuse_inode(inode);
1138 struct backing_dev_info *bdi = inode->i_mapping->backing_dev_info;
1139
1140 list_del(&req->writepages_entry);
1141 dec_bdi_stat(bdi, BDI_WRITEBACK);
1142 dec_zone_page_state(req->pages[0], NR_WRITEBACK_TEMP);
1143 bdi_writeout_inc(bdi);
1144 wake_up(&fi->page_waitq);
1145}
1146
1147/* Called under fc->lock, may release and reacquire it */
1148static void fuse_send_writepage(struct fuse_conn *fc, struct fuse_req *req)
Miklos Szeredib9ca67b2010-09-07 13:42:41 +02001149__releases(fc->lock)
1150__acquires(fc->lock)
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001151{
1152 struct fuse_inode *fi = get_fuse_inode(req->inode);
1153 loff_t size = i_size_read(req->inode);
1154 struct fuse_write_in *inarg = &req->misc.write.in;
1155
1156 if (!fc->connected)
1157 goto out_free;
1158
1159 if (inarg->offset + PAGE_CACHE_SIZE <= size) {
1160 inarg->size = PAGE_CACHE_SIZE;
1161 } else if (inarg->offset < size) {
1162 inarg->size = size & (PAGE_CACHE_SIZE - 1);
1163 } else {
1164 /* Got truncated off completely */
1165 goto out_free;
1166 }
1167
1168 req->in.args[1].size = inarg->size;
1169 fi->writectr++;
Tejun Heob93f8582008-11-26 12:03:55 +01001170 fuse_request_send_background_locked(fc, req);
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001171 return;
1172
1173 out_free:
1174 fuse_writepage_finish(fc, req);
1175 spin_unlock(&fc->lock);
1176 fuse_writepage_free(fc, req);
Tejun Heoe9bb09d2008-11-26 12:03:54 +01001177 fuse_put_request(fc, req);
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001178 spin_lock(&fc->lock);
1179}
1180
1181/*
1182 * If fi->writectr is positive (no truncate or fsync going on) send
1183 * all queued writepage requests.
1184 *
1185 * Called with fc->lock
1186 */
1187void fuse_flush_writepages(struct inode *inode)
Miklos Szeredib9ca67b2010-09-07 13:42:41 +02001188__releases(fc->lock)
1189__acquires(fc->lock)
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001190{
1191 struct fuse_conn *fc = get_fuse_conn(inode);
1192 struct fuse_inode *fi = get_fuse_inode(inode);
1193 struct fuse_req *req;
1194
1195 while (fi->writectr >= 0 && !list_empty(&fi->queued_writes)) {
1196 req = list_entry(fi->queued_writes.next, struct fuse_req, list);
1197 list_del_init(&req->list);
1198 fuse_send_writepage(fc, req);
1199 }
1200}
1201
1202static void fuse_writepage_end(struct fuse_conn *fc, struct fuse_req *req)
1203{
1204 struct inode *inode = req->inode;
1205 struct fuse_inode *fi = get_fuse_inode(inode);
1206
1207 mapping_set_error(inode->i_mapping, req->out.h.error);
1208 spin_lock(&fc->lock);
1209 fi->writectr--;
1210 fuse_writepage_finish(fc, req);
1211 spin_unlock(&fc->lock);
1212 fuse_writepage_free(fc, req);
1213}
1214
1215static int fuse_writepage_locked(struct page *page)
1216{
1217 struct address_space *mapping = page->mapping;
1218 struct inode *inode = mapping->host;
1219 struct fuse_conn *fc = get_fuse_conn(inode);
1220 struct fuse_inode *fi = get_fuse_inode(inode);
1221 struct fuse_req *req;
1222 struct fuse_file *ff;
1223 struct page *tmp_page;
1224
1225 set_page_writeback(page);
1226
1227 req = fuse_request_alloc_nofs();
1228 if (!req)
1229 goto err;
1230
1231 tmp_page = alloc_page(GFP_NOFS | __GFP_HIGHMEM);
1232 if (!tmp_page)
1233 goto err_free;
1234
1235 spin_lock(&fc->lock);
1236 BUG_ON(list_empty(&fi->write_files));
1237 ff = list_entry(fi->write_files.next, struct fuse_file, write_entry);
1238 req->ff = fuse_file_get(ff);
1239 spin_unlock(&fc->lock);
1240
Miklos Szeredi2106cb12009-04-28 16:56:37 +02001241 fuse_write_fill(req, ff, page_offset(page), 0);
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001242
1243 copy_highpage(tmp_page, page);
Miklos Szeredi2d698b02009-04-28 16:56:36 +02001244 req->misc.write.in.write_flags |= FUSE_WRITE_CACHE;
Miklos Szeredif4975c62009-04-02 14:25:34 +02001245 req->in.argpages = 1;
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001246 req->num_pages = 1;
1247 req->pages[0] = tmp_page;
1248 req->page_offset = 0;
1249 req->end = fuse_writepage_end;
1250 req->inode = inode;
1251
1252 inc_bdi_stat(mapping->backing_dev_info, BDI_WRITEBACK);
1253 inc_zone_page_state(tmp_page, NR_WRITEBACK_TEMP);
1254 end_page_writeback(page);
1255
1256 spin_lock(&fc->lock);
1257 list_add(&req->writepages_entry, &fi->writepages);
1258 list_add_tail(&req->list, &fi->queued_writes);
1259 fuse_flush_writepages(inode);
1260 spin_unlock(&fc->lock);
1261
1262 return 0;
1263
1264err_free:
1265 fuse_request_free(req);
1266err:
1267 end_page_writeback(page);
1268 return -ENOMEM;
1269}
1270
1271static int fuse_writepage(struct page *page, struct writeback_control *wbc)
1272{
1273 int err;
1274
1275 err = fuse_writepage_locked(page);
1276 unlock_page(page);
1277
1278 return err;
1279}
1280
1281static int fuse_launder_page(struct page *page)
1282{
1283 int err = 0;
1284 if (clear_page_dirty_for_io(page)) {
1285 struct inode *inode = page->mapping->host;
1286 err = fuse_writepage_locked(page);
1287 if (!err)
1288 fuse_wait_on_page_writeback(inode, page->index);
1289 }
1290 return err;
1291}
1292
1293/*
1294 * Write back dirty pages now, because there may not be any suitable
1295 * open files later
1296 */
1297static void fuse_vma_close(struct vm_area_struct *vma)
1298{
1299 filemap_write_and_wait(vma->vm_file->f_mapping);
1300}
1301
1302/*
1303 * Wait for writeback against this page to complete before allowing it
1304 * to be marked dirty again, and hence written back again, possibly
1305 * before the previous writepage completed.
1306 *
1307 * Block here, instead of in ->writepage(), so that the userspace fs
1308 * can only block processes actually operating on the filesystem.
1309 *
1310 * Otherwise unprivileged userspace fs would be able to block
1311 * unrelated:
1312 *
1313 * - page migration
1314 * - sync(2)
1315 * - try_to_free_pages() with order > PAGE_ALLOC_COSTLY_ORDER
1316 */
Nick Pigginc2ec1752009-03-31 15:23:21 -07001317static int fuse_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001318{
Nick Pigginc2ec1752009-03-31 15:23:21 -07001319 struct page *page = vmf->page;
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001320 /*
1321 * Don't use page->mapping as it may become NULL from a
1322 * concurrent truncate.
1323 */
1324 struct inode *inode = vma->vm_file->f_mapping->host;
1325
1326 fuse_wait_on_page_writeback(inode, page->index);
1327 return 0;
1328}
1329
Alexey Dobriyanf0f37e22009-09-27 22:29:37 +04001330static const struct vm_operations_struct fuse_file_vm_ops = {
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001331 .close = fuse_vma_close,
1332 .fault = filemap_fault,
1333 .page_mkwrite = fuse_page_mkwrite,
1334};
1335
1336static int fuse_file_mmap(struct file *file, struct vm_area_struct *vma)
1337{
1338 if ((vma->vm_flags & VM_SHARED) && (vma->vm_flags & VM_MAYWRITE)) {
1339 struct inode *inode = file->f_dentry->d_inode;
1340 struct fuse_conn *fc = get_fuse_conn(inode);
1341 struct fuse_inode *fi = get_fuse_inode(inode);
1342 struct fuse_file *ff = file->private_data;
1343 /*
1344 * file may be written through mmap, so chain it onto the
1345 * inodes's write_file list
1346 */
1347 spin_lock(&fc->lock);
1348 if (list_empty(&ff->write_entry))
1349 list_add(&ff->write_entry, &fi->write_files);
1350 spin_unlock(&fc->lock);
1351 }
1352 file_accessed(file);
1353 vma->vm_ops = &fuse_file_vm_ops;
Miklos Szeredib6aeade2005-09-09 13:10:30 -07001354 return 0;
1355}
1356
Miklos Szeredifc280c92009-04-02 14:25:35 +02001357static int fuse_direct_mmap(struct file *file, struct vm_area_struct *vma)
1358{
1359 /* Can't provide the coherency needed for MAP_SHARED */
1360 if (vma->vm_flags & VM_MAYSHARE)
1361 return -ENODEV;
1362
Miklos Szeredi3121bfe2009-04-09 17:37:53 +02001363 invalidate_inode_pages2(file->f_mapping);
1364
Miklos Szeredifc280c92009-04-02 14:25:35 +02001365 return generic_file_mmap(file, vma);
1366}
1367
Miklos Szeredi71421252006-06-25 05:48:52 -07001368static int convert_fuse_file_lock(const struct fuse_file_lock *ffl,
1369 struct file_lock *fl)
1370{
1371 switch (ffl->type) {
1372 case F_UNLCK:
1373 break;
1374
1375 case F_RDLCK:
1376 case F_WRLCK:
1377 if (ffl->start > OFFSET_MAX || ffl->end > OFFSET_MAX ||
1378 ffl->end < ffl->start)
1379 return -EIO;
1380
1381 fl->fl_start = ffl->start;
1382 fl->fl_end = ffl->end;
1383 fl->fl_pid = ffl->pid;
1384 break;
1385
1386 default:
1387 return -EIO;
1388 }
1389 fl->fl_type = ffl->type;
1390 return 0;
1391}
1392
1393static void fuse_lk_fill(struct fuse_req *req, struct file *file,
Miklos Szeredia9ff4f82007-10-18 03:07:02 -07001394 const struct file_lock *fl, int opcode, pid_t pid,
1395 int flock)
Miklos Szeredi71421252006-06-25 05:48:52 -07001396{
Josef Sipek7706a9d2006-12-08 02:37:02 -08001397 struct inode *inode = file->f_path.dentry->d_inode;
Miklos Szeredi9c8ef562006-06-25 05:48:55 -07001398 struct fuse_conn *fc = get_fuse_conn(inode);
Miklos Szeredi71421252006-06-25 05:48:52 -07001399 struct fuse_file *ff = file->private_data;
1400 struct fuse_lk_in *arg = &req->misc.lk_in;
1401
1402 arg->fh = ff->fh;
Miklos Szeredi9c8ef562006-06-25 05:48:55 -07001403 arg->owner = fuse_lock_owner_id(fc, fl->fl_owner);
Miklos Szeredi71421252006-06-25 05:48:52 -07001404 arg->lk.start = fl->fl_start;
1405 arg->lk.end = fl->fl_end;
1406 arg->lk.type = fl->fl_type;
1407 arg->lk.pid = pid;
Miklos Szeredia9ff4f82007-10-18 03:07:02 -07001408 if (flock)
1409 arg->lk_flags |= FUSE_LK_FLOCK;
Miklos Szeredi71421252006-06-25 05:48:52 -07001410 req->in.h.opcode = opcode;
1411 req->in.h.nodeid = get_node_id(inode);
1412 req->in.numargs = 1;
1413 req->in.args[0].size = sizeof(*arg);
1414 req->in.args[0].value = arg;
1415}
1416
1417static int fuse_getlk(struct file *file, struct file_lock *fl)
1418{
Josef Sipek7706a9d2006-12-08 02:37:02 -08001419 struct inode *inode = file->f_path.dentry->d_inode;
Miklos Szeredi71421252006-06-25 05:48:52 -07001420 struct fuse_conn *fc = get_fuse_conn(inode);
1421 struct fuse_req *req;
1422 struct fuse_lk_out outarg;
1423 int err;
1424
1425 req = fuse_get_req(fc);
1426 if (IS_ERR(req))
1427 return PTR_ERR(req);
1428
Miklos Szeredia9ff4f82007-10-18 03:07:02 -07001429 fuse_lk_fill(req, file, fl, FUSE_GETLK, 0, 0);
Miklos Szeredi71421252006-06-25 05:48:52 -07001430 req->out.numargs = 1;
1431 req->out.args[0].size = sizeof(outarg);
1432 req->out.args[0].value = &outarg;
Tejun Heob93f8582008-11-26 12:03:55 +01001433 fuse_request_send(fc, req);
Miklos Szeredi71421252006-06-25 05:48:52 -07001434 err = req->out.h.error;
1435 fuse_put_request(fc, req);
1436 if (!err)
1437 err = convert_fuse_file_lock(&outarg.lk, fl);
1438
1439 return err;
1440}
1441
Miklos Szeredia9ff4f82007-10-18 03:07:02 -07001442static int fuse_setlk(struct file *file, struct file_lock *fl, int flock)
Miklos Szeredi71421252006-06-25 05:48:52 -07001443{
Josef Sipek7706a9d2006-12-08 02:37:02 -08001444 struct inode *inode = file->f_path.dentry->d_inode;
Miklos Szeredi71421252006-06-25 05:48:52 -07001445 struct fuse_conn *fc = get_fuse_conn(inode);
1446 struct fuse_req *req;
1447 int opcode = (fl->fl_flags & FL_SLEEP) ? FUSE_SETLKW : FUSE_SETLK;
1448 pid_t pid = fl->fl_type != F_UNLCK ? current->tgid : 0;
1449 int err;
1450
J. Bruce Fields8fb47a42011-07-20 20:21:59 -04001451 if (fl->fl_lmops && fl->fl_lmops->lm_grant) {
Miklos Szeredi48e90762008-07-25 01:49:02 -07001452 /* NLM needs asynchronous locks, which we don't support yet */
1453 return -ENOLCK;
1454 }
1455
Miklos Szeredi71421252006-06-25 05:48:52 -07001456 /* Unlock on close is handled by the flush method */
1457 if (fl->fl_flags & FL_CLOSE)
1458 return 0;
1459
1460 req = fuse_get_req(fc);
1461 if (IS_ERR(req))
1462 return PTR_ERR(req);
1463
Miklos Szeredia9ff4f82007-10-18 03:07:02 -07001464 fuse_lk_fill(req, file, fl, opcode, pid, flock);
Tejun Heob93f8582008-11-26 12:03:55 +01001465 fuse_request_send(fc, req);
Miklos Szeredi71421252006-06-25 05:48:52 -07001466 err = req->out.h.error;
Miklos Szeredia4d27e72006-06-25 05:48:54 -07001467 /* locking is restartable */
1468 if (err == -EINTR)
1469 err = -ERESTARTSYS;
Miklos Szeredi71421252006-06-25 05:48:52 -07001470 fuse_put_request(fc, req);
1471 return err;
1472}
1473
1474static int fuse_file_lock(struct file *file, int cmd, struct file_lock *fl)
1475{
Josef Sipek7706a9d2006-12-08 02:37:02 -08001476 struct inode *inode = file->f_path.dentry->d_inode;
Miklos Szeredi71421252006-06-25 05:48:52 -07001477 struct fuse_conn *fc = get_fuse_conn(inode);
1478 int err;
1479
Miklos Szeredi48e90762008-07-25 01:49:02 -07001480 if (cmd == F_CANCELLK) {
1481 err = 0;
1482 } else if (cmd == F_GETLK) {
Miklos Szeredi71421252006-06-25 05:48:52 -07001483 if (fc->no_lock) {
Marc Eshel9d6a8c52007-02-21 00:55:18 -05001484 posix_test_lock(file, fl);
Miklos Szeredi71421252006-06-25 05:48:52 -07001485 err = 0;
1486 } else
1487 err = fuse_getlk(file, fl);
1488 } else {
1489 if (fc->no_lock)
Miklos Szeredi48e90762008-07-25 01:49:02 -07001490 err = posix_lock_file(file, fl, NULL);
Miklos Szeredi71421252006-06-25 05:48:52 -07001491 else
Miklos Szeredia9ff4f82007-10-18 03:07:02 -07001492 err = fuse_setlk(file, fl, 0);
Miklos Szeredi71421252006-06-25 05:48:52 -07001493 }
1494 return err;
1495}
1496
Miklos Szeredia9ff4f82007-10-18 03:07:02 -07001497static int fuse_file_flock(struct file *file, int cmd, struct file_lock *fl)
1498{
1499 struct inode *inode = file->f_path.dentry->d_inode;
1500 struct fuse_conn *fc = get_fuse_conn(inode);
1501 int err;
1502
Miklos Szeredi37fb3a32011-08-08 16:08:08 +02001503 if (fc->no_flock) {
Miklos Szeredia9ff4f82007-10-18 03:07:02 -07001504 err = flock_lock_file_wait(file, fl);
1505 } else {
Miklos Szeredi37fb3a32011-08-08 16:08:08 +02001506 struct fuse_file *ff = file->private_data;
1507
Miklos Szeredia9ff4f82007-10-18 03:07:02 -07001508 /* emulate flock with POSIX locks */
1509 fl->fl_owner = (fl_owner_t) file;
Miklos Szeredi37fb3a32011-08-08 16:08:08 +02001510 ff->flock = true;
Miklos Szeredia9ff4f82007-10-18 03:07:02 -07001511 err = fuse_setlk(file, fl, 1);
1512 }
1513
1514 return err;
1515}
1516
Miklos Szeredib2d22722006-12-06 20:35:51 -08001517static sector_t fuse_bmap(struct address_space *mapping, sector_t block)
1518{
1519 struct inode *inode = mapping->host;
1520 struct fuse_conn *fc = get_fuse_conn(inode);
1521 struct fuse_req *req;
1522 struct fuse_bmap_in inarg;
1523 struct fuse_bmap_out outarg;
1524 int err;
1525
1526 if (!inode->i_sb->s_bdev || fc->no_bmap)
1527 return 0;
1528
1529 req = fuse_get_req(fc);
1530 if (IS_ERR(req))
1531 return 0;
1532
1533 memset(&inarg, 0, sizeof(inarg));
1534 inarg.block = block;
1535 inarg.blocksize = inode->i_sb->s_blocksize;
1536 req->in.h.opcode = FUSE_BMAP;
1537 req->in.h.nodeid = get_node_id(inode);
1538 req->in.numargs = 1;
1539 req->in.args[0].size = sizeof(inarg);
1540 req->in.args[0].value = &inarg;
1541 req->out.numargs = 1;
1542 req->out.args[0].size = sizeof(outarg);
1543 req->out.args[0].value = &outarg;
Tejun Heob93f8582008-11-26 12:03:55 +01001544 fuse_request_send(fc, req);
Miklos Szeredib2d22722006-12-06 20:35:51 -08001545 err = req->out.h.error;
1546 fuse_put_request(fc, req);
1547 if (err == -ENOSYS)
1548 fc->no_bmap = 1;
1549
1550 return err ? 0 : outarg.block;
1551}
1552
Miklos Szeredi5559b8f2008-04-30 00:54:45 -07001553static loff_t fuse_file_llseek(struct file *file, loff_t offset, int origin)
1554{
1555 loff_t retval;
1556 struct inode *inode = file->f_path.dentry->d_inode;
1557
1558 mutex_lock(&inode->i_mutex);
Josef Bacik06222e42011-07-18 13:21:38 -04001559 if (origin != SEEK_CUR || origin != SEEK_SET) {
Miklos Szeredi769415c2008-10-16 16:08:56 +02001560 retval = fuse_update_attributes(inode, NULL, file, NULL);
1561 if (retval)
Dan Carpenter52916582009-03-27 13:36:10 +03001562 goto exit;
Josef Bacik06222e42011-07-18 13:21:38 -04001563 }
1564
1565 switch (origin) {
1566 case SEEK_END:
Miklos Szeredi5559b8f2008-04-30 00:54:45 -07001567 offset += i_size_read(inode);
1568 break;
1569 case SEEK_CUR:
1570 offset += file->f_pos;
Josef Bacik06222e42011-07-18 13:21:38 -04001571 break;
1572 case SEEK_DATA:
1573 if (offset >= i_size_read(inode)) {
1574 retval = -ENXIO;
1575 goto exit;
1576 }
1577 break;
1578 case SEEK_HOLE:
1579 if (offset >= i_size_read(inode)) {
1580 retval = -ENXIO;
1581 goto exit;
1582 }
1583 offset = i_size_read(inode);
1584 break;
Miklos Szeredi5559b8f2008-04-30 00:54:45 -07001585 }
1586 retval = -EINVAL;
1587 if (offset >= 0 && offset <= inode->i_sb->s_maxbytes) {
1588 if (offset != file->f_pos) {
1589 file->f_pos = offset;
1590 file->f_version = 0;
1591 }
1592 retval = offset;
1593 }
Dan Carpenter52916582009-03-27 13:36:10 +03001594exit:
Miklos Szeredi5559b8f2008-04-30 00:54:45 -07001595 mutex_unlock(&inode->i_mutex);
1596 return retval;
1597}
1598
Tejun Heo59efec72008-11-26 12:03:55 +01001599static int fuse_ioctl_copy_user(struct page **pages, struct iovec *iov,
1600 unsigned int nr_segs, size_t bytes, bool to_user)
1601{
1602 struct iov_iter ii;
1603 int page_idx = 0;
1604
1605 if (!bytes)
1606 return 0;
1607
1608 iov_iter_init(&ii, iov, nr_segs, bytes, 0);
1609
1610 while (iov_iter_count(&ii)) {
1611 struct page *page = pages[page_idx++];
1612 size_t todo = min_t(size_t, PAGE_SIZE, iov_iter_count(&ii));
Dan Carpenter4aa0edd2010-05-07 10:28:17 +02001613 void *kaddr;
Tejun Heo59efec72008-11-26 12:03:55 +01001614
Dan Carpenter4aa0edd2010-05-07 10:28:17 +02001615 kaddr = kmap(page);
Tejun Heo59efec72008-11-26 12:03:55 +01001616
1617 while (todo) {
1618 char __user *uaddr = ii.iov->iov_base + ii.iov_offset;
1619 size_t iov_len = ii.iov->iov_len - ii.iov_offset;
1620 size_t copy = min(todo, iov_len);
1621 size_t left;
1622
1623 if (!to_user)
1624 left = copy_from_user(kaddr, uaddr, copy);
1625 else
1626 left = copy_to_user(uaddr, kaddr, copy);
1627
1628 if (unlikely(left))
1629 return -EFAULT;
1630
1631 iov_iter_advance(&ii, copy);
1632 todo -= copy;
1633 kaddr += copy;
1634 }
1635
Jens Axboe0bd87182009-11-03 11:40:44 +01001636 kunmap(page);
Tejun Heo59efec72008-11-26 12:03:55 +01001637 }
1638
1639 return 0;
1640}
1641
1642/*
Miklos Szeredid9d318d2010-11-30 16:39:27 +01001643 * CUSE servers compiled on 32bit broke on 64bit kernels because the
1644 * ABI was defined to be 'struct iovec' which is different on 32bit
1645 * and 64bit. Fortunately we can determine which structure the server
1646 * used from the size of the reply.
1647 */
Miklos Szeredi1baa26b2010-12-07 20:16:56 +01001648static int fuse_copy_ioctl_iovec_old(struct iovec *dst, void *src,
1649 size_t transferred, unsigned count,
1650 bool is_compat)
Miklos Szeredid9d318d2010-11-30 16:39:27 +01001651{
1652#ifdef CONFIG_COMPAT
1653 if (count * sizeof(struct compat_iovec) == transferred) {
1654 struct compat_iovec *ciov = src;
1655 unsigned i;
1656
1657 /*
1658 * With this interface a 32bit server cannot support
1659 * non-compat (i.e. ones coming from 64bit apps) ioctl
1660 * requests
1661 */
1662 if (!is_compat)
1663 return -EINVAL;
1664
1665 for (i = 0; i < count; i++) {
1666 dst[i].iov_base = compat_ptr(ciov[i].iov_base);
1667 dst[i].iov_len = ciov[i].iov_len;
1668 }
1669 return 0;
1670 }
1671#endif
1672
1673 if (count * sizeof(struct iovec) != transferred)
1674 return -EIO;
1675
1676 memcpy(dst, src, transferred);
1677 return 0;
1678}
1679
Miklos Szeredi75727772010-11-30 16:39:27 +01001680/* Make sure iov_length() won't overflow */
1681static int fuse_verify_ioctl_iov(struct iovec *iov, size_t count)
1682{
1683 size_t n;
1684 u32 max = FUSE_MAX_PAGES_PER_REQ << PAGE_SHIFT;
1685
1686 for (n = 0; n < count; n++) {
1687 if (iov->iov_len > (size_t) max)
1688 return -ENOMEM;
1689 max -= iov->iov_len;
1690 }
1691 return 0;
1692}
1693
Miklos Szeredi1baa26b2010-12-07 20:16:56 +01001694static int fuse_copy_ioctl_iovec(struct fuse_conn *fc, struct iovec *dst,
1695 void *src, size_t transferred, unsigned count,
1696 bool is_compat)
1697{
1698 unsigned i;
1699 struct fuse_ioctl_iovec *fiov = src;
1700
1701 if (fc->minor < 16) {
1702 return fuse_copy_ioctl_iovec_old(dst, src, transferred,
1703 count, is_compat);
1704 }
1705
1706 if (count * sizeof(struct fuse_ioctl_iovec) != transferred)
1707 return -EIO;
1708
1709 for (i = 0; i < count; i++) {
1710 /* Did the server supply an inappropriate value? */
1711 if (fiov[i].base != (unsigned long) fiov[i].base ||
1712 fiov[i].len != (unsigned long) fiov[i].len)
1713 return -EIO;
1714
1715 dst[i].iov_base = (void __user *) (unsigned long) fiov[i].base;
1716 dst[i].iov_len = (size_t) fiov[i].len;
1717
1718#ifdef CONFIG_COMPAT
1719 if (is_compat &&
1720 (ptr_to_compat(dst[i].iov_base) != fiov[i].base ||
1721 (compat_size_t) dst[i].iov_len != fiov[i].len))
1722 return -EIO;
1723#endif
1724 }
1725
1726 return 0;
1727}
1728
1729
Miklos Szeredid9d318d2010-11-30 16:39:27 +01001730/*
Tejun Heo59efec72008-11-26 12:03:55 +01001731 * For ioctls, there is no generic way to determine how much memory
1732 * needs to be read and/or written. Furthermore, ioctls are allowed
1733 * to dereference the passed pointer, so the parameter requires deep
1734 * copying but FUSE has no idea whatsoever about what to copy in or
1735 * out.
1736 *
1737 * This is solved by allowing FUSE server to retry ioctl with
1738 * necessary in/out iovecs. Let's assume the ioctl implementation
1739 * needs to read in the following structure.
1740 *
1741 * struct a {
1742 * char *buf;
1743 * size_t buflen;
1744 * }
1745 *
1746 * On the first callout to FUSE server, inarg->in_size and
1747 * inarg->out_size will be NULL; then, the server completes the ioctl
1748 * with FUSE_IOCTL_RETRY set in out->flags, out->in_iovs set to 1 and
1749 * the actual iov array to
1750 *
1751 * { { .iov_base = inarg.arg, .iov_len = sizeof(struct a) } }
1752 *
1753 * which tells FUSE to copy in the requested area and retry the ioctl.
1754 * On the second round, the server has access to the structure and
1755 * from that it can tell what to look for next, so on the invocation,
1756 * it sets FUSE_IOCTL_RETRY, out->in_iovs to 2 and iov array to
1757 *
1758 * { { .iov_base = inarg.arg, .iov_len = sizeof(struct a) },
1759 * { .iov_base = a.buf, .iov_len = a.buflen } }
1760 *
1761 * FUSE will copy both struct a and the pointed buffer from the
1762 * process doing the ioctl and retry ioctl with both struct a and the
1763 * buffer.
1764 *
1765 * This time, FUSE server has everything it needs and completes ioctl
1766 * without FUSE_IOCTL_RETRY which finishes the ioctl call.
1767 *
1768 * Copying data out works the same way.
1769 *
1770 * Note that if FUSE_IOCTL_UNRESTRICTED is clear, the kernel
1771 * automatically initializes in and out iovs by decoding @cmd with
1772 * _IOC_* macros and the server is not allowed to request RETRY. This
1773 * limits ioctl data transfers to well-formed ioctls and is the forced
1774 * behavior for all FUSE servers.
1775 */
Tejun Heo08cbf542009-04-14 10:54:53 +09001776long fuse_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg,
1777 unsigned int flags)
Tejun Heo59efec72008-11-26 12:03:55 +01001778{
Tejun Heo59efec72008-11-26 12:03:55 +01001779 struct fuse_file *ff = file->private_data;
Miklos Szeredid36f2482009-04-28 16:56:39 +02001780 struct fuse_conn *fc = ff->fc;
Tejun Heo59efec72008-11-26 12:03:55 +01001781 struct fuse_ioctl_in inarg = {
1782 .fh = ff->fh,
1783 .cmd = cmd,
1784 .arg = arg,
1785 .flags = flags
1786 };
1787 struct fuse_ioctl_out outarg;
1788 struct fuse_req *req = NULL;
1789 struct page **pages = NULL;
Miklos Szeredi8ac83502010-12-07 20:16:56 +01001790 struct iovec *iov_page = NULL;
Tejun Heo59efec72008-11-26 12:03:55 +01001791 struct iovec *in_iov = NULL, *out_iov = NULL;
1792 unsigned int in_iovs = 0, out_iovs = 0, num_pages = 0, max_pages;
1793 size_t in_size, out_size, transferred;
1794 int err;
1795
Miklos Szeredi1baa26b2010-12-07 20:16:56 +01001796#if BITS_PER_LONG == 32
1797 inarg.flags |= FUSE_IOCTL_32BIT;
1798#else
1799 if (flags & FUSE_IOCTL_COMPAT)
1800 inarg.flags |= FUSE_IOCTL_32BIT;
1801#endif
1802
Tejun Heo59efec72008-11-26 12:03:55 +01001803 /* assume all the iovs returned by client always fits in a page */
Miklos Szeredi1baa26b2010-12-07 20:16:56 +01001804 BUILD_BUG_ON(sizeof(struct fuse_ioctl_iovec) * FUSE_IOCTL_MAX_IOV > PAGE_SIZE);
Tejun Heo59efec72008-11-26 12:03:55 +01001805
Tejun Heo59efec72008-11-26 12:03:55 +01001806 err = -ENOMEM;
1807 pages = kzalloc(sizeof(pages[0]) * FUSE_MAX_PAGES_PER_REQ, GFP_KERNEL);
Miklos Szeredi8ac83502010-12-07 20:16:56 +01001808 iov_page = (struct iovec *) __get_free_page(GFP_KERNEL);
Tejun Heo59efec72008-11-26 12:03:55 +01001809 if (!pages || !iov_page)
1810 goto out;
1811
1812 /*
1813 * If restricted, initialize IO parameters as encoded in @cmd.
1814 * RETRY from server is not allowed.
1815 */
1816 if (!(flags & FUSE_IOCTL_UNRESTRICTED)) {
Miklos Szeredi8ac83502010-12-07 20:16:56 +01001817 struct iovec *iov = iov_page;
Tejun Heo59efec72008-11-26 12:03:55 +01001818
Miklos Szeredic9f0523d2008-12-02 14:49:42 +01001819 iov->iov_base = (void __user *)arg;
Tejun Heo59efec72008-11-26 12:03:55 +01001820 iov->iov_len = _IOC_SIZE(cmd);
1821
1822 if (_IOC_DIR(cmd) & _IOC_WRITE) {
1823 in_iov = iov;
1824 in_iovs = 1;
1825 }
1826
1827 if (_IOC_DIR(cmd) & _IOC_READ) {
1828 out_iov = iov;
1829 out_iovs = 1;
1830 }
1831 }
1832
1833 retry:
1834 inarg.in_size = in_size = iov_length(in_iov, in_iovs);
1835 inarg.out_size = out_size = iov_length(out_iov, out_iovs);
1836
1837 /*
1838 * Out data can be used either for actual out data or iovs,
1839 * make sure there always is at least one page.
1840 */
1841 out_size = max_t(size_t, out_size, PAGE_SIZE);
1842 max_pages = DIV_ROUND_UP(max(in_size, out_size), PAGE_SIZE);
1843
1844 /* make sure there are enough buffer pages and init request with them */
1845 err = -ENOMEM;
1846 if (max_pages > FUSE_MAX_PAGES_PER_REQ)
1847 goto out;
1848 while (num_pages < max_pages) {
1849 pages[num_pages] = alloc_page(GFP_KERNEL | __GFP_HIGHMEM);
1850 if (!pages[num_pages])
1851 goto out;
1852 num_pages++;
1853 }
1854
1855 req = fuse_get_req(fc);
1856 if (IS_ERR(req)) {
1857 err = PTR_ERR(req);
1858 req = NULL;
1859 goto out;
1860 }
1861 memcpy(req->pages, pages, sizeof(req->pages[0]) * num_pages);
1862 req->num_pages = num_pages;
1863
1864 /* okay, let's send it to the client */
1865 req->in.h.opcode = FUSE_IOCTL;
Miklos Szeredid36f2482009-04-28 16:56:39 +02001866 req->in.h.nodeid = ff->nodeid;
Tejun Heo59efec72008-11-26 12:03:55 +01001867 req->in.numargs = 1;
1868 req->in.args[0].size = sizeof(inarg);
1869 req->in.args[0].value = &inarg;
1870 if (in_size) {
1871 req->in.numargs++;
1872 req->in.args[1].size = in_size;
1873 req->in.argpages = 1;
1874
1875 err = fuse_ioctl_copy_user(pages, in_iov, in_iovs, in_size,
1876 false);
1877 if (err)
1878 goto out;
1879 }
1880
1881 req->out.numargs = 2;
1882 req->out.args[0].size = sizeof(outarg);
1883 req->out.args[0].value = &outarg;
1884 req->out.args[1].size = out_size;
1885 req->out.argpages = 1;
1886 req->out.argvar = 1;
1887
Tejun Heob93f8582008-11-26 12:03:55 +01001888 fuse_request_send(fc, req);
Tejun Heo59efec72008-11-26 12:03:55 +01001889 err = req->out.h.error;
1890 transferred = req->out.args[1].size;
1891 fuse_put_request(fc, req);
1892 req = NULL;
1893 if (err)
1894 goto out;
1895
1896 /* did it ask for retry? */
1897 if (outarg.flags & FUSE_IOCTL_RETRY) {
Miklos Szeredi8ac83502010-12-07 20:16:56 +01001898 void *vaddr;
Tejun Heo59efec72008-11-26 12:03:55 +01001899
1900 /* no retry if in restricted mode */
1901 err = -EIO;
1902 if (!(flags & FUSE_IOCTL_UNRESTRICTED))
1903 goto out;
1904
1905 in_iovs = outarg.in_iovs;
1906 out_iovs = outarg.out_iovs;
1907
1908 /*
1909 * Make sure things are in boundary, separate checks
1910 * are to protect against overflow.
1911 */
1912 err = -ENOMEM;
1913 if (in_iovs > FUSE_IOCTL_MAX_IOV ||
1914 out_iovs > FUSE_IOCTL_MAX_IOV ||
1915 in_iovs + out_iovs > FUSE_IOCTL_MAX_IOV)
1916 goto out;
1917
Tejun Heo59efec72008-11-26 12:03:55 +01001918 vaddr = kmap_atomic(pages[0], KM_USER0);
Miklos Szeredi1baa26b2010-12-07 20:16:56 +01001919 err = fuse_copy_ioctl_iovec(fc, iov_page, vaddr,
Miklos Szeredid9d318d2010-11-30 16:39:27 +01001920 transferred, in_iovs + out_iovs,
1921 (flags & FUSE_IOCTL_COMPAT) != 0);
Tejun Heo59efec72008-11-26 12:03:55 +01001922 kunmap_atomic(vaddr, KM_USER0);
Miklos Szeredid9d318d2010-11-30 16:39:27 +01001923 if (err)
1924 goto out;
Tejun Heo59efec72008-11-26 12:03:55 +01001925
Miklos Szeredi8ac83502010-12-07 20:16:56 +01001926 in_iov = iov_page;
Tejun Heo59efec72008-11-26 12:03:55 +01001927 out_iov = in_iov + in_iovs;
1928
Miklos Szeredi75727772010-11-30 16:39:27 +01001929 err = fuse_verify_ioctl_iov(in_iov, in_iovs);
1930 if (err)
1931 goto out;
1932
1933 err = fuse_verify_ioctl_iov(out_iov, out_iovs);
1934 if (err)
1935 goto out;
1936
Tejun Heo59efec72008-11-26 12:03:55 +01001937 goto retry;
1938 }
1939
1940 err = -EIO;
1941 if (transferred > inarg.out_size)
1942 goto out;
1943
1944 err = fuse_ioctl_copy_user(pages, out_iov, out_iovs, transferred, true);
1945 out:
1946 if (req)
1947 fuse_put_request(fc, req);
Miklos Szeredi8ac83502010-12-07 20:16:56 +01001948 free_page((unsigned long) iov_page);
Tejun Heo59efec72008-11-26 12:03:55 +01001949 while (num_pages)
1950 __free_page(pages[--num_pages]);
1951 kfree(pages);
1952
1953 return err ? err : outarg.result;
1954}
Tejun Heo08cbf542009-04-14 10:54:53 +09001955EXPORT_SYMBOL_GPL(fuse_do_ioctl);
Tejun Heo59efec72008-11-26 12:03:55 +01001956
Miklos Szeredid36f2482009-04-28 16:56:39 +02001957static long fuse_file_ioctl_common(struct file *file, unsigned int cmd,
1958 unsigned long arg, unsigned int flags)
1959{
1960 struct inode *inode = file->f_dentry->d_inode;
1961 struct fuse_conn *fc = get_fuse_conn(inode);
1962
1963 if (!fuse_allow_task(fc, current))
1964 return -EACCES;
1965
1966 if (is_bad_inode(inode))
1967 return -EIO;
1968
1969 return fuse_do_ioctl(file, cmd, arg, flags);
1970}
1971
Tejun Heo59efec72008-11-26 12:03:55 +01001972static long fuse_file_ioctl(struct file *file, unsigned int cmd,
1973 unsigned long arg)
1974{
Miklos Szeredid36f2482009-04-28 16:56:39 +02001975 return fuse_file_ioctl_common(file, cmd, arg, 0);
Tejun Heo59efec72008-11-26 12:03:55 +01001976}
1977
1978static long fuse_file_compat_ioctl(struct file *file, unsigned int cmd,
1979 unsigned long arg)
1980{
Miklos Szeredid36f2482009-04-28 16:56:39 +02001981 return fuse_file_ioctl_common(file, cmd, arg, FUSE_IOCTL_COMPAT);
Tejun Heo59efec72008-11-26 12:03:55 +01001982}
1983
Tejun Heo95668a62008-11-26 12:03:55 +01001984/*
1985 * All files which have been polled are linked to RB tree
1986 * fuse_conn->polled_files which is indexed by kh. Walk the tree and
1987 * find the matching one.
1988 */
1989static struct rb_node **fuse_find_polled_node(struct fuse_conn *fc, u64 kh,
1990 struct rb_node **parent_out)
1991{
1992 struct rb_node **link = &fc->polled_files.rb_node;
1993 struct rb_node *last = NULL;
1994
1995 while (*link) {
1996 struct fuse_file *ff;
1997
1998 last = *link;
1999 ff = rb_entry(last, struct fuse_file, polled_node);
2000
2001 if (kh < ff->kh)
2002 link = &last->rb_left;
2003 else if (kh > ff->kh)
2004 link = &last->rb_right;
2005 else
2006 return link;
2007 }
2008
2009 if (parent_out)
2010 *parent_out = last;
2011 return link;
2012}
2013
2014/*
2015 * The file is about to be polled. Make sure it's on the polled_files
2016 * RB tree. Note that files once added to the polled_files tree are
2017 * not removed before the file is released. This is because a file
2018 * polled once is likely to be polled again.
2019 */
2020static void fuse_register_polled_file(struct fuse_conn *fc,
2021 struct fuse_file *ff)
2022{
2023 spin_lock(&fc->lock);
2024 if (RB_EMPTY_NODE(&ff->polled_node)) {
2025 struct rb_node **link, *parent;
2026
2027 link = fuse_find_polled_node(fc, ff->kh, &parent);
2028 BUG_ON(*link);
2029 rb_link_node(&ff->polled_node, parent, link);
2030 rb_insert_color(&ff->polled_node, &fc->polled_files);
2031 }
2032 spin_unlock(&fc->lock);
2033}
2034
Tejun Heo08cbf542009-04-14 10:54:53 +09002035unsigned fuse_file_poll(struct file *file, poll_table *wait)
Tejun Heo95668a62008-11-26 12:03:55 +01002036{
Tejun Heo95668a62008-11-26 12:03:55 +01002037 struct fuse_file *ff = file->private_data;
Miklos Szeredi797759a2009-04-28 16:56:41 +02002038 struct fuse_conn *fc = ff->fc;
Tejun Heo95668a62008-11-26 12:03:55 +01002039 struct fuse_poll_in inarg = { .fh = ff->fh, .kh = ff->kh };
2040 struct fuse_poll_out outarg;
2041 struct fuse_req *req;
2042 int err;
2043
2044 if (fc->no_poll)
2045 return DEFAULT_POLLMASK;
2046
2047 poll_wait(file, &ff->poll_wait, wait);
2048
2049 /*
2050 * Ask for notification iff there's someone waiting for it.
2051 * The client may ignore the flag and always notify.
2052 */
2053 if (waitqueue_active(&ff->poll_wait)) {
2054 inarg.flags |= FUSE_POLL_SCHEDULE_NOTIFY;
2055 fuse_register_polled_file(fc, ff);
2056 }
2057
2058 req = fuse_get_req(fc);
2059 if (IS_ERR(req))
Miklos Szeredi201fa692009-06-30 20:06:24 +02002060 return POLLERR;
Tejun Heo95668a62008-11-26 12:03:55 +01002061
2062 req->in.h.opcode = FUSE_POLL;
Miklos Szeredi797759a2009-04-28 16:56:41 +02002063 req->in.h.nodeid = ff->nodeid;
Tejun Heo95668a62008-11-26 12:03:55 +01002064 req->in.numargs = 1;
2065 req->in.args[0].size = sizeof(inarg);
2066 req->in.args[0].value = &inarg;
2067 req->out.numargs = 1;
2068 req->out.args[0].size = sizeof(outarg);
2069 req->out.args[0].value = &outarg;
Tejun Heob93f8582008-11-26 12:03:55 +01002070 fuse_request_send(fc, req);
Tejun Heo95668a62008-11-26 12:03:55 +01002071 err = req->out.h.error;
2072 fuse_put_request(fc, req);
2073
2074 if (!err)
2075 return outarg.revents;
2076 if (err == -ENOSYS) {
2077 fc->no_poll = 1;
2078 return DEFAULT_POLLMASK;
2079 }
2080 return POLLERR;
2081}
Tejun Heo08cbf542009-04-14 10:54:53 +09002082EXPORT_SYMBOL_GPL(fuse_file_poll);
Tejun Heo95668a62008-11-26 12:03:55 +01002083
2084/*
2085 * This is called from fuse_handle_notify() on FUSE_NOTIFY_POLL and
2086 * wakes up the poll waiters.
2087 */
2088int fuse_notify_poll_wakeup(struct fuse_conn *fc,
2089 struct fuse_notify_poll_wakeup_out *outarg)
2090{
2091 u64 kh = outarg->kh;
2092 struct rb_node **link;
2093
2094 spin_lock(&fc->lock);
2095
2096 link = fuse_find_polled_node(fc, kh, NULL);
2097 if (*link) {
2098 struct fuse_file *ff;
2099
2100 ff = rb_entry(*link, struct fuse_file, polled_node);
2101 wake_up_interruptible_sync(&ff->poll_wait);
2102 }
2103
2104 spin_unlock(&fc->lock);
2105 return 0;
2106}
2107
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -08002108static const struct file_operations fuse_file_operations = {
Miklos Szeredi5559b8f2008-04-30 00:54:45 -07002109 .llseek = fuse_file_llseek,
Badari Pulavarty543ade12006-09-30 23:28:48 -07002110 .read = do_sync_read,
Miklos Szeredibcb4be82007-11-28 16:21:59 -08002111 .aio_read = fuse_file_aio_read,
Badari Pulavarty543ade12006-09-30 23:28:48 -07002112 .write = do_sync_write,
Nick Pigginea9b9902008-04-30 00:54:42 -07002113 .aio_write = fuse_file_aio_write,
Miklos Szeredib6aeade2005-09-09 13:10:30 -07002114 .mmap = fuse_file_mmap,
2115 .open = fuse_open,
2116 .flush = fuse_flush,
2117 .release = fuse_release,
2118 .fsync = fuse_fsync,
Miklos Szeredi71421252006-06-25 05:48:52 -07002119 .lock = fuse_file_lock,
Miklos Szeredia9ff4f82007-10-18 03:07:02 -07002120 .flock = fuse_file_flock,
Jens Axboe5ffc4ef2007-06-01 11:49:19 +02002121 .splice_read = generic_file_splice_read,
Tejun Heo59efec72008-11-26 12:03:55 +01002122 .unlocked_ioctl = fuse_file_ioctl,
2123 .compat_ioctl = fuse_file_compat_ioctl,
Tejun Heo95668a62008-11-26 12:03:55 +01002124 .poll = fuse_file_poll,
Miklos Szeredib6aeade2005-09-09 13:10:30 -07002125};
2126
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -08002127static const struct file_operations fuse_direct_io_file_operations = {
Miklos Szeredi5559b8f2008-04-30 00:54:45 -07002128 .llseek = fuse_file_llseek,
Miklos Szeredi413ef8c2005-09-09 13:10:35 -07002129 .read = fuse_direct_read,
2130 .write = fuse_direct_write,
Miklos Szeredifc280c92009-04-02 14:25:35 +02002131 .mmap = fuse_direct_mmap,
Miklos Szeredi413ef8c2005-09-09 13:10:35 -07002132 .open = fuse_open,
2133 .flush = fuse_flush,
2134 .release = fuse_release,
2135 .fsync = fuse_fsync,
Miklos Szeredi71421252006-06-25 05:48:52 -07002136 .lock = fuse_file_lock,
Miklos Szeredia9ff4f82007-10-18 03:07:02 -07002137 .flock = fuse_file_flock,
Tejun Heo59efec72008-11-26 12:03:55 +01002138 .unlocked_ioctl = fuse_file_ioctl,
2139 .compat_ioctl = fuse_file_compat_ioctl,
Tejun Heo95668a62008-11-26 12:03:55 +01002140 .poll = fuse_file_poll,
Miklos Szeredifc280c92009-04-02 14:25:35 +02002141 /* no splice_read */
Miklos Szeredi413ef8c2005-09-09 13:10:35 -07002142};
2143
Christoph Hellwigf5e54d62006-06-28 04:26:44 -07002144static const struct address_space_operations fuse_file_aops = {
Miklos Szeredib6aeade2005-09-09 13:10:30 -07002145 .readpage = fuse_readpage,
Miklos Szeredi3be5a522008-04-30 00:54:41 -07002146 .writepage = fuse_writepage,
2147 .launder_page = fuse_launder_page,
Miklos Szeredidb50b962005-09-09 13:10:33 -07002148 .readpages = fuse_readpages,
Miklos Szeredi3be5a522008-04-30 00:54:41 -07002149 .set_page_dirty = __set_page_dirty_nobuffers,
Miklos Szeredib2d22722006-12-06 20:35:51 -08002150 .bmap = fuse_bmap,
Miklos Szeredib6aeade2005-09-09 13:10:30 -07002151};
2152
2153void fuse_init_file_inode(struct inode *inode)
2154{
Miklos Szeredi45323fb2005-09-09 13:10:37 -07002155 inode->i_fop = &fuse_file_operations;
2156 inode->i_data.a_ops = &fuse_file_aops;
Miklos Szeredib6aeade2005-09-09 13:10:30 -07002157}