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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>
Brian Foster3634a632013-05-17 09:30:32 -040018#include <linux/falloc.h>
Christoph Hellwige2e40f22015-02-22 08:58:50 -080019#include <linux/uio.h>
Miklos Szeredib6aeade2005-09-09 13:10:30 -070020
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -080021static const struct file_operations fuse_direct_io_file_operations;
Miklos Szeredi45323fb2005-09-09 13:10:37 -070022
Miklos Szeredi91fe96b2009-04-28 16:56:37 +020023static int fuse_send_open(struct fuse_conn *fc, u64 nodeid, struct file *file,
24 int opcode, struct fuse_open_out *outargp)
Miklos Szeredib6aeade2005-09-09 13:10:30 -070025{
Miklos Szeredib6aeade2005-09-09 13:10:30 -070026 struct fuse_open_in inarg;
Miklos Szeredi70781872014-12-12 09:49:05 +010027 FUSE_ARGS(args);
Miklos Szeredifd72faa2005-11-07 00:59:51 -080028
29 memset(&inarg, 0, sizeof(inarg));
Miklos Szeredi6ff958e2007-10-18 03:07:02 -070030 inarg.flags = file->f_flags & ~(O_CREAT | O_EXCL | O_NOCTTY);
31 if (!fc->atomic_o_trunc)
32 inarg.flags &= ~O_TRUNC;
Miklos Szeredi70781872014-12-12 09:49:05 +010033 args.in.h.opcode = opcode;
34 args.in.h.nodeid = nodeid;
35 args.in.numargs = 1;
36 args.in.args[0].size = sizeof(inarg);
37 args.in.args[0].value = &inarg;
38 args.out.numargs = 1;
39 args.out.args[0].size = sizeof(*outargp);
40 args.out.args[0].value = outargp;
Miklos Szeredifd72faa2005-11-07 00:59:51 -080041
Miklos Szeredi70781872014-12-12 09:49:05 +010042 return fuse_simple_request(fc, &args);
Miklos Szeredifd72faa2005-11-07 00:59:51 -080043}
44
Tejun Heoacf99432008-11-26 12:03:55 +010045struct fuse_file *fuse_file_alloc(struct fuse_conn *fc)
Miklos Szeredifd72faa2005-11-07 00:59:51 -080046{
47 struct fuse_file *ff;
Tejun Heo6b2db282009-04-14 10:54:49 +090048
Miklos Szeredifd72faa2005-11-07 00:59:51 -080049 ff = kmalloc(sizeof(struct fuse_file), GFP_KERNEL);
Tejun Heo6b2db282009-04-14 10:54:49 +090050 if (unlikely(!ff))
51 return NULL;
52
Miklos Szeredida5e4712009-04-28 16:56:36 +020053 ff->fc = fc;
Maxim Patlasov4250c062012-10-26 19:48:07 +040054 ff->reserved_req = fuse_request_alloc(0);
Tejun Heo6b2db282009-04-14 10:54:49 +090055 if (unlikely(!ff->reserved_req)) {
56 kfree(ff);
57 return NULL;
Miklos Szeredifd72faa2005-11-07 00:59:51 -080058 }
Tejun Heo6b2db282009-04-14 10:54:49 +090059
60 INIT_LIST_HEAD(&ff->write_entry);
61 atomic_set(&ff->count, 0);
62 RB_CLEAR_NODE(&ff->polled_node);
63 init_waitqueue_head(&ff->poll_wait);
64
65 spin_lock(&fc->lock);
66 ff->kh = ++fc->khctr;
67 spin_unlock(&fc->lock);
68
Miklos Szeredifd72faa2005-11-07 00:59:51 -080069 return ff;
70}
71
72void fuse_file_free(struct fuse_file *ff)
73{
Miklos Szeredi33649c92006-06-25 05:48:52 -070074 fuse_request_free(ff->reserved_req);
Miklos Szeredifd72faa2005-11-07 00:59:51 -080075 kfree(ff);
76}
77
Miklos Szeredic7b71432009-04-28 16:56:37 +020078struct fuse_file *fuse_file_get(struct fuse_file *ff)
Miklos Szeredic756e0a2007-10-16 23:31:00 -070079{
80 atomic_inc(&ff->count);
81 return ff;
82}
83
Miklos Szeredi5a18ec12011-02-25 14:44:58 +010084static void fuse_release_end(struct fuse_conn *fc, struct fuse_req *req)
85{
Miklos Szeredibaebccb2014-12-12 09:49:04 +010086 iput(req->misc.release.inode);
Miklos Szeredi5a18ec12011-02-25 14:44:58 +010087}
88
89static void fuse_file_put(struct fuse_file *ff, bool sync)
Miklos Szeredic756e0a2007-10-16 23:31:00 -070090{
91 if (atomic_dec_and_test(&ff->count)) {
92 struct fuse_req *req = ff->reserved_req;
Miklos Szeredi8b0797a2009-04-28 16:56:39 +020093
Andrew Gallagher7678ac52013-11-05 16:05:52 +010094 if (ff->fc->no_open) {
95 /*
96 * Drop the release request when client does not
97 * implement 'open'
98 */
Miklos Szeredi825d6d32015-07-01 16:25:58 +020099 __clear_bit(FR_BACKGROUND, &req->flags);
Miklos Szeredibaebccb2014-12-12 09:49:04 +0100100 iput(req->misc.release.inode);
Andrew Gallagher7678ac52013-11-05 16:05:52 +0100101 fuse_put_request(ff->fc, req);
102 } else if (sync) {
Miklos Szeredi825d6d32015-07-01 16:25:58 +0200103 __clear_bit(FR_BACKGROUND, &req->flags);
Miklos Szeredi5a18ec12011-02-25 14:44:58 +0100104 fuse_request_send(ff->fc, req);
Miklos Szeredibaebccb2014-12-12 09:49:04 +0100105 iput(req->misc.release.inode);
Miklos Szeredi5a18ec12011-02-25 14:44:58 +0100106 fuse_put_request(ff->fc, req);
107 } else {
108 req->end = fuse_release_end;
Miklos Szeredi825d6d32015-07-01 16:25:58 +0200109 __set_bit(FR_BACKGROUND, &req->flags);
Miklos Szeredi5a18ec12011-02-25 14:44:58 +0100110 fuse_request_send_background(ff->fc, req);
111 }
Miklos Szeredic756e0a2007-10-16 23:31:00 -0700112 kfree(ff);
113 }
114}
115
Tejun Heo08cbf542009-04-14 10:54:53 +0900116int fuse_do_open(struct fuse_conn *fc, u64 nodeid, struct file *file,
117 bool isdir)
Miklos Szeredi91fe96b2009-04-28 16:56:37 +0200118{
Miklos Szeredi91fe96b2009-04-28 16:56:37 +0200119 struct fuse_file *ff;
Miklos Szeredi91fe96b2009-04-28 16:56:37 +0200120 int opcode = isdir ? FUSE_OPENDIR : FUSE_OPEN;
121
122 ff = fuse_file_alloc(fc);
123 if (!ff)
124 return -ENOMEM;
125
Andrew Gallagher7678ac52013-11-05 16:05:52 +0100126 ff->fh = 0;
127 ff->open_flags = FOPEN_KEEP_CACHE; /* Default for no-open */
128 if (!fc->no_open || isdir) {
129 struct fuse_open_out outarg;
130 int err;
131
132 err = fuse_send_open(fc, nodeid, file, opcode, &outarg);
133 if (!err) {
134 ff->fh = outarg.fh;
135 ff->open_flags = outarg.open_flags;
136
137 } else if (err != -ENOSYS || isdir) {
138 fuse_file_free(ff);
139 return err;
140 } else {
141 fc->no_open = 1;
142 }
Miklos Szeredi91fe96b2009-04-28 16:56:37 +0200143 }
144
145 if (isdir)
Andrew Gallagher7678ac52013-11-05 16:05:52 +0100146 ff->open_flags &= ~FOPEN_DIRECT_IO;
Miklos Szeredi91fe96b2009-04-28 16:56:37 +0200147
Miklos Szeredi91fe96b2009-04-28 16:56:37 +0200148 ff->nodeid = nodeid;
Miklos Szeredi91fe96b2009-04-28 16:56:37 +0200149 file->private_data = fuse_file_get(ff);
150
151 return 0;
152}
Tejun Heo08cbf542009-04-14 10:54:53 +0900153EXPORT_SYMBOL_GPL(fuse_do_open);
Miklos Szeredi91fe96b2009-04-28 16:56:37 +0200154
Pavel Emelyanov650b22b2013-10-10 17:10:04 +0400155static void fuse_link_write_file(struct file *file)
156{
157 struct inode *inode = file_inode(file);
158 struct fuse_conn *fc = get_fuse_conn(inode);
159 struct fuse_inode *fi = get_fuse_inode(inode);
160 struct fuse_file *ff = file->private_data;
161 /*
162 * file may be written through mmap, so chain it onto the
163 * inodes's write_file list
164 */
165 spin_lock(&fc->lock);
166 if (list_empty(&ff->write_entry))
167 list_add(&ff->write_entry, &fi->write_files);
168 spin_unlock(&fc->lock);
169}
170
Miklos Szeredic7b71432009-04-28 16:56:37 +0200171void fuse_finish_open(struct inode *inode, struct file *file)
Miklos Szeredifd72faa2005-11-07 00:59:51 -0800172{
Miklos Szeredic7b71432009-04-28 16:56:37 +0200173 struct fuse_file *ff = file->private_data;
Ken Sumralla0822c52010-11-24 12:57:00 -0800174 struct fuse_conn *fc = get_fuse_conn(inode);
Miklos Szeredic7b71432009-04-28 16:56:37 +0200175
176 if (ff->open_flags & FOPEN_DIRECT_IO)
Miklos Szeredifd72faa2005-11-07 00:59:51 -0800177 file->f_op = &fuse_direct_io_file_operations;
Miklos Szeredic7b71432009-04-28 16:56:37 +0200178 if (!(ff->open_flags & FOPEN_KEEP_CACHE))
Miklos Szeredib1009972007-10-16 23:31:01 -0700179 invalidate_inode_pages2(inode->i_mapping);
Miklos Szeredic7b71432009-04-28 16:56:37 +0200180 if (ff->open_flags & FOPEN_NONSEEKABLE)
Tejun Heoa7c1b992008-10-16 16:08:57 +0200181 nonseekable_open(inode, file);
Ken Sumralla0822c52010-11-24 12:57:00 -0800182 if (fc->atomic_o_trunc && (file->f_flags & O_TRUNC)) {
183 struct fuse_inode *fi = get_fuse_inode(inode);
184
185 spin_lock(&fc->lock);
186 fi->attr_version = ++fc->attr_version;
187 i_size_write(inode, 0);
188 spin_unlock(&fc->lock);
189 fuse_invalidate_attr(inode);
Maxim Patlasov75caeec2014-04-28 14:19:22 +0200190 if (fc->writeback_cache)
191 file_update_time(file);
Ken Sumralla0822c52010-11-24 12:57:00 -0800192 }
Pavel Emelyanov4d99ff82013-10-10 17:12:18 +0400193 if ((file->f_mode & FMODE_WRITE) && fc->writeback_cache)
194 fuse_link_write_file(file);
Miklos Szeredifd72faa2005-11-07 00:59:51 -0800195}
196
Miklos Szeredi91fe96b2009-04-28 16:56:37 +0200197int fuse_open_common(struct inode *inode, struct file *file, bool isdir)
Miklos Szeredifd72faa2005-11-07 00:59:51 -0800198{
Tejun Heoacf99432008-11-26 12:03:55 +0100199 struct fuse_conn *fc = get_fuse_conn(inode);
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700200 int err;
Maxim Patlasov75caeec2014-04-28 14:19:22 +0200201 bool lock_inode = (file->f_flags & O_TRUNC) &&
202 fc->atomic_o_trunc &&
203 fc->writeback_cache;
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700204
205 err = generic_file_open(inode, file);
206 if (err)
207 return err;
208
Maxim Patlasov75caeec2014-04-28 14:19:22 +0200209 if (lock_inode)
210 mutex_lock(&inode->i_mutex);
211
Miklos Szeredi91fe96b2009-04-28 16:56:37 +0200212 err = fuse_do_open(fc, get_node_id(inode), file, isdir);
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700213
Maxim Patlasov75caeec2014-04-28 14:19:22 +0200214 if (!err)
215 fuse_finish_open(inode, file);
Miklos Szeredi91fe96b2009-04-28 16:56:37 +0200216
Maxim Patlasov75caeec2014-04-28 14:19:22 +0200217 if (lock_inode)
218 mutex_unlock(&inode->i_mutex);
219
220 return err;
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700221}
222
Miklos Szeredi8b0797a2009-04-28 16:56:39 +0200223static void fuse_prepare_release(struct fuse_file *ff, int flags, int opcode)
Miklos Szeredi64c6d8e2006-01-16 22:14:42 -0800224{
Miklos Szeredi8b0797a2009-04-28 16:56:39 +0200225 struct fuse_conn *fc = ff->fc;
Miklos Szeredi33649c92006-06-25 05:48:52 -0700226 struct fuse_req *req = ff->reserved_req;
Miklos Szeredib57d4262008-02-06 01:38:39 -0800227 struct fuse_release_in *inarg = &req->misc.release.in;
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700228
Miklos Szeredi8b0797a2009-04-28 16:56:39 +0200229 spin_lock(&fc->lock);
230 list_del(&ff->write_entry);
231 if (!RB_EMPTY_NODE(&ff->polled_node))
232 rb_erase(&ff->polled_node, &fc->polled_files);
233 spin_unlock(&fc->lock);
234
Bryan Green357ccf22011-03-01 16:43:52 -0800235 wake_up_interruptible_all(&ff->poll_wait);
Miklos Szeredi8b0797a2009-04-28 16:56:39 +0200236
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700237 inarg->fh = ff->fh;
Miklos Szeredifd72faa2005-11-07 00:59:51 -0800238 inarg->flags = flags;
Miklos Szeredi51eb01e2006-06-25 05:48:50 -0700239 req->in.h.opcode = opcode;
Miklos Szeredic7b71432009-04-28 16:56:37 +0200240 req->in.h.nodeid = ff->nodeid;
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700241 req->in.numargs = 1;
242 req->in.args[0].size = sizeof(struct fuse_release_in);
243 req->in.args[0].value = inarg;
Miklos Szeredifd72faa2005-11-07 00:59:51 -0800244}
245
Miklos Szeredi8b0797a2009-04-28 16:56:39 +0200246void fuse_release_common(struct file *file, int opcode)
Miklos Szeredifd72faa2005-11-07 00:59:51 -0800247{
Tejun Heo6b2db282009-04-14 10:54:49 +0900248 struct fuse_file *ff;
249 struct fuse_req *req;
Miklos Szeredi93a8c3c2007-10-18 03:07:03 -0700250
Tejun Heo6b2db282009-04-14 10:54:49 +0900251 ff = file->private_data;
252 if (unlikely(!ff))
Miklos Szeredi8b0797a2009-04-28 16:56:39 +0200253 return;
Miklos Szeredi51eb01e2006-06-25 05:48:50 -0700254
Tejun Heo6b2db282009-04-14 10:54:49 +0900255 req = ff->reserved_req;
Miklos Szeredi8b0797a2009-04-28 16:56:39 +0200256 fuse_prepare_release(ff, file->f_flags, opcode);
Tejun Heo95668a62008-11-26 12:03:55 +0100257
Miklos Szeredi37fb3a32011-08-08 16:08:08 +0200258 if (ff->flock) {
259 struct fuse_release_in *inarg = &req->misc.release.in;
260 inarg->release_flags |= FUSE_RELEASE_FLOCK_UNLOCK;
261 inarg->lock_owner = fuse_lock_owner_id(ff->fc,
262 (fl_owner_t) file);
263 }
Miklos Szeredibaebccb2014-12-12 09:49:04 +0100264 /* Hold inode until release is finished */
265 req->misc.release.inode = igrab(file_inode(file));
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700266
Tejun Heo6b2db282009-04-14 10:54:49 +0900267 /*
268 * Normally this will send the RELEASE request, however if
269 * some asynchronous READ or WRITE requests are outstanding,
270 * the sending will be delayed.
Miklos Szeredi5a18ec12011-02-25 14:44:58 +0100271 *
272 * Make the release synchronous if this is a fuseblk mount,
273 * synchronous RELEASE is allowed (and desirable) in this case
274 * because the server can be trusted not to screw up.
Tejun Heo6b2db282009-04-14 10:54:49 +0900275 */
Miklos Szeredi5a18ec12011-02-25 14:44:58 +0100276 fuse_file_put(ff, ff->fc->destroy_req != NULL);
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700277}
278
Miklos Szeredi04730fe2005-09-09 13:10:36 -0700279static int fuse_open(struct inode *inode, struct file *file)
280{
Miklos Szeredi91fe96b2009-04-28 16:56:37 +0200281 return fuse_open_common(inode, file, false);
Miklos Szeredi04730fe2005-09-09 13:10:36 -0700282}
283
284static int fuse_release(struct inode *inode, struct file *file)
285{
Pavel Emelyanove7cc133c2013-10-10 17:19:06 +0400286 struct fuse_conn *fc = get_fuse_conn(inode);
287
288 /* see fuse_vma_close() for !writeback_cache case */
289 if (fc->writeback_cache)
Miklos Szeredi1e18bda2014-04-28 14:19:23 +0200290 write_inode_now(inode, 1);
Maxim Patlasovb0aa7602013-12-26 19:51:11 +0400291
Miklos Szeredi8b0797a2009-04-28 16:56:39 +0200292 fuse_release_common(file, FUSE_RELEASE);
293
294 /* return value is ignored by VFS */
295 return 0;
296}
297
298void fuse_sync_release(struct fuse_file *ff, int flags)
299{
300 WARN_ON(atomic_read(&ff->count) > 1);
301 fuse_prepare_release(ff, flags, FUSE_RELEASE);
Miklos Szeredi825d6d32015-07-01 16:25:58 +0200302 __set_bit(FR_FORCE, &ff->reserved_req->flags);
303 __clear_bit(FR_BACKGROUND, &ff->reserved_req->flags);
Miklos Szeredi8b0797a2009-04-28 16:56:39 +0200304 fuse_request_send(ff->fc, ff->reserved_req);
305 fuse_put_request(ff->fc, ff->reserved_req);
306 kfree(ff);
Miklos Szeredi04730fe2005-09-09 13:10:36 -0700307}
Tejun Heo08cbf542009-04-14 10:54:53 +0900308EXPORT_SYMBOL_GPL(fuse_sync_release);
Miklos Szeredi04730fe2005-09-09 13:10:36 -0700309
Miklos Szeredi71421252006-06-25 05:48:52 -0700310/*
Miklos Szeredi9c8ef562006-06-25 05:48:55 -0700311 * Scramble the ID space with XTEA, so that the value of the files_struct
312 * pointer is not exposed to userspace.
Miklos Szeredi71421252006-06-25 05:48:52 -0700313 */
Miklos Szeredif3332112007-10-18 03:07:04 -0700314u64 fuse_lock_owner_id(struct fuse_conn *fc, fl_owner_t id)
Miklos Szeredi71421252006-06-25 05:48:52 -0700315{
Miklos Szeredi9c8ef562006-06-25 05:48:55 -0700316 u32 *k = fc->scramble_key;
317 u64 v = (unsigned long) id;
318 u32 v0 = v;
319 u32 v1 = v >> 32;
320 u32 sum = 0;
321 int i;
322
323 for (i = 0; i < 32; i++) {
324 v0 += ((v1 << 4 ^ v1 >> 5) + v1) ^ (sum + k[sum & 3]);
325 sum += 0x9E3779B9;
326 v1 += ((v0 << 4 ^ v0 >> 5) + v0) ^ (sum + k[sum>>11 & 3]);
327 }
328
329 return (u64) v0 + ((u64) v1 << 32);
Miklos Szeredi71421252006-06-25 05:48:52 -0700330}
331
Miklos Szeredi3be5a522008-04-30 00:54:41 -0700332/*
Pavel Emelyanovea8cd332013-10-10 17:12:05 +0400333 * Check if any page in a range is under writeback
Miklos Szeredi3be5a522008-04-30 00:54:41 -0700334 *
335 * This is currently done by walking the list of writepage requests
336 * for the inode, which can be pretty inefficient.
337 */
Pavel Emelyanovea8cd332013-10-10 17:12:05 +0400338static bool fuse_range_is_writeback(struct inode *inode, pgoff_t idx_from,
339 pgoff_t idx_to)
Miklos Szeredi3be5a522008-04-30 00:54:41 -0700340{
341 struct fuse_conn *fc = get_fuse_conn(inode);
342 struct fuse_inode *fi = get_fuse_inode(inode);
343 struct fuse_req *req;
344 bool found = false;
345
346 spin_lock(&fc->lock);
347 list_for_each_entry(req, &fi->writepages, writepages_entry) {
348 pgoff_t curr_index;
349
350 BUG_ON(req->inode != inode);
351 curr_index = req->misc.write.in.offset >> PAGE_CACHE_SHIFT;
Pavel Emelyanovea8cd332013-10-10 17:12:05 +0400352 if (idx_from < curr_index + req->num_pages &&
353 curr_index <= idx_to) {
Miklos Szeredi3be5a522008-04-30 00:54:41 -0700354 found = true;
355 break;
356 }
357 }
358 spin_unlock(&fc->lock);
359
360 return found;
361}
362
Pavel Emelyanovea8cd332013-10-10 17:12:05 +0400363static inline bool fuse_page_is_writeback(struct inode *inode, pgoff_t index)
364{
365 return fuse_range_is_writeback(inode, index, index);
366}
367
Miklos Szeredi3be5a522008-04-30 00:54:41 -0700368/*
369 * Wait for page writeback to be completed.
370 *
371 * Since fuse doesn't rely on the VM writeback tracking, this has to
372 * use some other means.
373 */
374static int fuse_wait_on_page_writeback(struct inode *inode, pgoff_t index)
375{
376 struct fuse_inode *fi = get_fuse_inode(inode);
377
378 wait_event(fi->page_waitq, !fuse_page_is_writeback(inode, index));
379 return 0;
380}
381
Maxim Patlasovfe38d7d2013-10-10 17:11:54 +0400382/*
383 * Wait for all pending writepages on the inode to finish.
384 *
385 * This is currently done by blocking further writes with FUSE_NOWRITE
386 * and waiting for all sent writes to complete.
387 *
388 * This must be called under i_mutex, otherwise the FUSE_NOWRITE usage
389 * could conflict with truncation.
390 */
391static void fuse_sync_writes(struct inode *inode)
392{
393 fuse_set_nowrite(inode);
394 fuse_release_nowrite(inode);
395}
396
Miklos Szeredi75e1fcc2006-06-23 02:05:12 -0700397static int fuse_flush(struct file *file, fl_owner_t id)
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700398{
Al Viro6131ffa2013-02-27 16:59:05 -0500399 struct inode *inode = file_inode(file);
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700400 struct fuse_conn *fc = get_fuse_conn(inode);
401 struct fuse_file *ff = file->private_data;
402 struct fuse_req *req;
403 struct fuse_flush_in inarg;
404 int err;
405
Miklos Szeredi248d86e2006-01-06 00:19:39 -0800406 if (is_bad_inode(inode))
407 return -EIO;
408
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700409 if (fc->no_flush)
410 return 0;
411
Miklos Szeredi1e18bda2014-04-28 14:19:23 +0200412 err = write_inode_now(inode, 1);
Maxim Patlasovfe38d7d2013-10-10 17:11:54 +0400413 if (err)
414 return err;
415
416 mutex_lock(&inode->i_mutex);
417 fuse_sync_writes(inode);
418 mutex_unlock(&inode->i_mutex);
419
Maxim Patlasovb111c8c2012-10-26 19:48:30 +0400420 req = fuse_get_req_nofail_nopages(fc, file);
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700421 memset(&inarg, 0, sizeof(inarg));
422 inarg.fh = ff->fh;
Miklos Szeredi9c8ef562006-06-25 05:48:55 -0700423 inarg.lock_owner = fuse_lock_owner_id(fc, id);
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700424 req->in.h.opcode = FUSE_FLUSH;
425 req->in.h.nodeid = get_node_id(inode);
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700426 req->in.numargs = 1;
427 req->in.args[0].size = sizeof(inarg);
428 req->in.args[0].value = &inarg;
Miklos Szeredi825d6d32015-07-01 16:25:58 +0200429 __set_bit(FR_FORCE, &req->flags);
Tejun Heob93f8582008-11-26 12:03:55 +0100430 fuse_request_send(fc, req);
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700431 err = req->out.h.error;
432 fuse_put_request(fc, req);
433 if (err == -ENOSYS) {
434 fc->no_flush = 1;
435 err = 0;
436 }
437 return err;
438}
439
Josef Bacik02c24a82011-07-16 20:44:56 -0400440int fuse_fsync_common(struct file *file, loff_t start, loff_t end,
441 int datasync, int isdir)
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700442{
Christoph Hellwig7ea80852010-05-26 17:53:25 +0200443 struct inode *inode = file->f_mapping->host;
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700444 struct fuse_conn *fc = get_fuse_conn(inode);
445 struct fuse_file *ff = file->private_data;
Miklos Szeredi70781872014-12-12 09:49:05 +0100446 FUSE_ARGS(args);
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700447 struct fuse_fsync_in inarg;
448 int err;
449
Miklos Szeredi248d86e2006-01-06 00:19:39 -0800450 if (is_bad_inode(inode))
451 return -EIO;
452
Josef Bacik02c24a82011-07-16 20:44:56 -0400453 mutex_lock(&inode->i_mutex);
454
Miklos Szeredi3be5a522008-04-30 00:54:41 -0700455 /*
456 * Start writeback against all dirty pages of the inode, then
457 * wait for all outstanding writes, before sending the FSYNC
458 * request.
459 */
Miklos Szeredi22401e72014-04-28 14:19:23 +0200460 err = filemap_write_and_wait_range(inode->i_mapping, start, end);
Miklos Szeredi3be5a522008-04-30 00:54:41 -0700461 if (err)
Josef Bacik02c24a82011-07-16 20:44:56 -0400462 goto out;
Miklos Szeredi3be5a522008-04-30 00:54:41 -0700463
464 fuse_sync_writes(inode);
Miklos Szeredi1e18bda2014-04-28 14:19:23 +0200465 err = sync_inode_metadata(inode, 1);
466 if (err)
467 goto out;
Miklos Szeredi3be5a522008-04-30 00:54:41 -0700468
Miklos Szeredi22401e72014-04-28 14:19:23 +0200469 if ((!isdir && fc->no_fsync) || (isdir && fc->no_fsyncdir))
470 goto out;
Maxim Patlasovb0aa7602013-12-26 19:51:11 +0400471
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700472 memset(&inarg, 0, sizeof(inarg));
473 inarg.fh = ff->fh;
474 inarg.fsync_flags = datasync ? 1 : 0;
Miklos Szeredi70781872014-12-12 09:49:05 +0100475 args.in.h.opcode = isdir ? FUSE_FSYNCDIR : FUSE_FSYNC;
476 args.in.h.nodeid = get_node_id(inode);
477 args.in.numargs = 1;
478 args.in.args[0].size = sizeof(inarg);
479 args.in.args[0].value = &inarg;
480 err = fuse_simple_request(fc, &args);
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700481 if (err == -ENOSYS) {
Miklos Szeredi82547982005-09-09 13:10:38 -0700482 if (isdir)
483 fc->no_fsyncdir = 1;
484 else
485 fc->no_fsync = 1;
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700486 err = 0;
487 }
Josef Bacik02c24a82011-07-16 20:44:56 -0400488out:
489 mutex_unlock(&inode->i_mutex);
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700490 return err;
491}
492
Josef Bacik02c24a82011-07-16 20:44:56 -0400493static int fuse_fsync(struct file *file, loff_t start, loff_t end,
494 int datasync)
Miklos Szeredi82547982005-09-09 13:10:38 -0700495{
Josef Bacik02c24a82011-07-16 20:44:56 -0400496 return fuse_fsync_common(file, start, end, datasync, 0);
Miklos Szeredi82547982005-09-09 13:10:38 -0700497}
498
Miklos Szeredi2106cb12009-04-28 16:56:37 +0200499void fuse_read_fill(struct fuse_req *req, struct file *file, loff_t pos,
500 size_t count, int opcode)
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700501{
Miklos Szeredi5c5c5e52008-04-30 00:54:43 -0700502 struct fuse_read_in *inarg = &req->misc.read.in;
Miklos Szeredia6643092007-11-28 16:22:00 -0800503 struct fuse_file *ff = file->private_data;
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700504
Miklos Szeredi361b1eb52006-01-16 22:14:45 -0800505 inarg->fh = ff->fh;
506 inarg->offset = pos;
507 inarg->size = count;
Miklos Szeredia6643092007-11-28 16:22:00 -0800508 inarg->flags = file->f_flags;
Miklos Szeredi361b1eb52006-01-16 22:14:45 -0800509 req->in.h.opcode = opcode;
Miklos Szeredi2106cb12009-04-28 16:56:37 +0200510 req->in.h.nodeid = ff->nodeid;
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700511 req->in.numargs = 1;
512 req->in.args[0].size = sizeof(struct fuse_read_in);
Miklos Szeredic1aa96a2006-01-16 22:14:46 -0800513 req->in.args[0].value = inarg;
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700514 req->out.argvar = 1;
515 req->out.numargs = 1;
516 req->out.args[0].size = count;
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700517}
518
Maxim Patlasov187c5c32012-12-14 19:20:25 +0400519static void fuse_release_user_pages(struct fuse_req *req, int write)
520{
521 unsigned i;
522
523 for (i = 0; i < req->num_pages; i++) {
524 struct page *page = req->pages[i];
525 if (write)
526 set_page_dirty_lock(page);
527 put_page(page);
528 }
529}
530
Christoph Hellwig9d5722b2015-02-02 14:59:43 +0100531static ssize_t fuse_get_res_by_io(struct fuse_io_priv *io)
532{
533 if (io->err)
534 return io->err;
535
536 if (io->bytes >= 0 && io->write)
537 return -EIO;
538
539 return io->bytes < 0 ? io->size : io->bytes;
540}
541
Maxim Patlasov01e9d112012-12-14 19:20:41 +0400542/**
543 * In case of short read, the caller sets 'pos' to the position of
544 * actual end of fuse request in IO request. Otherwise, if bytes_requested
545 * == bytes_transferred or rw == WRITE, the caller sets 'pos' to -1.
546 *
547 * An example:
548 * User requested DIO read of 64K. It was splitted into two 32K fuse requests,
549 * both submitted asynchronously. The first of them was ACKed by userspace as
550 * fully completed (req->out.args[0].size == 32K) resulting in pos == -1. The
551 * second request was ACKed as short, e.g. only 1K was read, resulting in
552 * pos == 33K.
553 *
554 * Thus, when all fuse requests are completed, the minimal non-negative 'pos'
555 * will be equal to the length of the longest contiguous fragment of
556 * transferred data starting from the beginning of IO request.
557 */
558static void fuse_aio_complete(struct fuse_io_priv *io, int err, ssize_t pos)
559{
Christoph Hellwig9d5722b2015-02-02 14:59:43 +0100560 bool is_sync = is_sync_kiocb(io->iocb);
Maxim Patlasov01e9d112012-12-14 19:20:41 +0400561 int left;
562
563 spin_lock(&io->lock);
564 if (err)
565 io->err = io->err ? : err;
566 else if (pos >= 0 && (io->bytes < 0 || pos < io->bytes))
567 io->bytes = pos;
568
569 left = --io->reqs;
Christoph Hellwig9d5722b2015-02-02 14:59:43 +0100570 if (!left && is_sync)
571 complete(io->done);
Maxim Patlasov01e9d112012-12-14 19:20:41 +0400572 spin_unlock(&io->lock);
573
Christoph Hellwig9d5722b2015-02-02 14:59:43 +0100574 if (!left && !is_sync) {
575 ssize_t res = fuse_get_res_by_io(io);
Maxim Patlasov01e9d112012-12-14 19:20:41 +0400576
Christoph Hellwig9d5722b2015-02-02 14:59:43 +0100577 if (res >= 0) {
578 struct inode *inode = file_inode(io->iocb->ki_filp);
579 struct fuse_conn *fc = get_fuse_conn(inode);
580 struct fuse_inode *fi = get_fuse_inode(inode);
Maxim Patlasov01e9d112012-12-14 19:20:41 +0400581
Christoph Hellwig9d5722b2015-02-02 14:59:43 +0100582 spin_lock(&fc->lock);
583 fi->attr_version = ++fc->attr_version;
584 spin_unlock(&fc->lock);
Maxim Patlasov01e9d112012-12-14 19:20:41 +0400585 }
586
Christoph Hellwig04b2fa92015-02-02 14:49:06 +0100587 io->iocb->ki_complete(io->iocb, res, 0);
Maxim Patlasov01e9d112012-12-14 19:20:41 +0400588 kfree(io);
589 }
590}
591
592static void fuse_aio_complete_req(struct fuse_conn *fc, struct fuse_req *req)
593{
594 struct fuse_io_priv *io = req->io;
595 ssize_t pos = -1;
596
597 fuse_release_user_pages(req, !io->write);
598
599 if (io->write) {
600 if (req->misc.write.in.size != req->misc.write.out.size)
601 pos = req->misc.write.in.offset - io->offset +
602 req->misc.write.out.size;
603 } else {
604 if (req->misc.read.in.size != req->out.args[0].size)
605 pos = req->misc.read.in.offset - io->offset +
606 req->out.args[0].size;
607 }
608
609 fuse_aio_complete(io, req->out.h.error, pos);
610}
611
612static size_t fuse_async_req_send(struct fuse_conn *fc, struct fuse_req *req,
613 size_t num_bytes, struct fuse_io_priv *io)
614{
615 spin_lock(&io->lock);
616 io->size += num_bytes;
617 io->reqs++;
618 spin_unlock(&io->lock);
619
620 req->io = io;
621 req->end = fuse_aio_complete_req;
622
Maxim Patlasov36cf66e2012-12-14 19:20:51 +0400623 __fuse_get_request(req);
Maxim Patlasov01e9d112012-12-14 19:20:41 +0400624 fuse_request_send_background(fc, req);
625
626 return num_bytes;
627}
628
Maxim Patlasov36cf66e2012-12-14 19:20:51 +0400629static size_t fuse_send_read(struct fuse_req *req, struct fuse_io_priv *io,
Miklos Szeredi2106cb12009-04-28 16:56:37 +0200630 loff_t pos, size_t count, fl_owner_t owner)
Miklos Szeredi04730fe2005-09-09 13:10:36 -0700631{
Maxim Patlasov36cf66e2012-12-14 19:20:51 +0400632 struct file *file = io->file;
Miklos Szeredi2106cb12009-04-28 16:56:37 +0200633 struct fuse_file *ff = file->private_data;
634 struct fuse_conn *fc = ff->fc;
Miklos Szeredif3332112007-10-18 03:07:04 -0700635
Miklos Szeredi2106cb12009-04-28 16:56:37 +0200636 fuse_read_fill(req, file, pos, count, FUSE_READ);
Miklos Szeredif3332112007-10-18 03:07:04 -0700637 if (owner != NULL) {
Miklos Szeredi5c5c5e52008-04-30 00:54:43 -0700638 struct fuse_read_in *inarg = &req->misc.read.in;
Miklos Szeredif3332112007-10-18 03:07:04 -0700639
640 inarg->read_flags |= FUSE_READ_LOCKOWNER;
641 inarg->lock_owner = fuse_lock_owner_id(fc, owner);
642 }
Maxim Patlasov36cf66e2012-12-14 19:20:51 +0400643
644 if (io->async)
645 return fuse_async_req_send(fc, req, count, io);
646
Tejun Heob93f8582008-11-26 12:03:55 +0100647 fuse_request_send(fc, req);
Miklos Szeredi361b1eb52006-01-16 22:14:45 -0800648 return req->out.args[0].size;
Miklos Szeredi04730fe2005-09-09 13:10:36 -0700649}
650
Miklos Szeredi5c5c5e52008-04-30 00:54:43 -0700651static void fuse_read_update_size(struct inode *inode, loff_t size,
652 u64 attr_ver)
653{
654 struct fuse_conn *fc = get_fuse_conn(inode);
655 struct fuse_inode *fi = get_fuse_inode(inode);
656
657 spin_lock(&fc->lock);
Maxim Patlasov06a7c3c2013-08-30 17:06:04 +0400658 if (attr_ver == fi->attr_version && size < inode->i_size &&
659 !test_bit(FUSE_I_SIZE_UNSTABLE, &fi->state)) {
Miklos Szeredi5c5c5e52008-04-30 00:54:43 -0700660 fi->attr_version = ++fc->attr_version;
661 i_size_write(inode, size);
662 }
663 spin_unlock(&fc->lock);
664}
665
Pavel Emelyanova92adc82013-10-10 17:10:16 +0400666static void fuse_short_read(struct fuse_req *req, struct inode *inode,
667 u64 attr_ver)
668{
669 size_t num_read = req->out.args[0].size;
Pavel Emelyanov83732002013-10-10 17:10:46 +0400670 struct fuse_conn *fc = get_fuse_conn(inode);
Pavel Emelyanova92adc82013-10-10 17:10:16 +0400671
Pavel Emelyanov83732002013-10-10 17:10:46 +0400672 if (fc->writeback_cache) {
673 /*
674 * A hole in a file. Some data after the hole are in page cache,
675 * but have not reached the client fs yet. So, the hole is not
676 * present there.
677 */
678 int i;
679 int start_idx = num_read >> PAGE_CACHE_SHIFT;
680 size_t off = num_read & (PAGE_CACHE_SIZE - 1);
681
682 for (i = start_idx; i < req->num_pages; i++) {
683 zero_user_segment(req->pages[i], off, PAGE_CACHE_SIZE);
684 off = 0;
685 }
686 } else {
687 loff_t pos = page_offset(req->pages[0]) + num_read;
688 fuse_read_update_size(inode, pos, attr_ver);
689 }
Pavel Emelyanova92adc82013-10-10 17:10:16 +0400690}
691
Maxim Patlasov482fce52013-10-10 17:11:25 +0400692static int fuse_do_readpage(struct file *file, struct page *page)
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700693{
Maxim Patlasov36cf66e2012-12-14 19:20:51 +0400694 struct fuse_io_priv io = { .async = 0, .file = file };
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700695 struct inode *inode = page->mapping->host;
696 struct fuse_conn *fc = get_fuse_conn(inode);
Miklos Szeredi248d86e2006-01-06 00:19:39 -0800697 struct fuse_req *req;
Miklos Szeredi5c5c5e52008-04-30 00:54:43 -0700698 size_t num_read;
699 loff_t pos = page_offset(page);
700 size_t count = PAGE_CACHE_SIZE;
701 u64 attr_ver;
Miklos Szeredi248d86e2006-01-06 00:19:39 -0800702 int err;
703
Miklos Szeredi3be5a522008-04-30 00:54:41 -0700704 /*
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300705 * Page writeback can extend beyond the lifetime of the
Miklos Szeredi3be5a522008-04-30 00:54:41 -0700706 * page-cache page, so make sure we read a properly synced
707 * page.
708 */
709 fuse_wait_on_page_writeback(inode, page->index);
710
Maxim Patlasovb111c8c2012-10-26 19:48:30 +0400711 req = fuse_get_req(fc, 1);
Miklos Szeredice1d5a42006-04-10 22:54:58 -0700712 if (IS_ERR(req))
Maxim Patlasov482fce52013-10-10 17:11:25 +0400713 return PTR_ERR(req);
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700714
Miklos Szeredi5c5c5e52008-04-30 00:54:43 -0700715 attr_ver = fuse_get_attr_version(fc);
716
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700717 req->out.page_zeroing = 1;
Miklos Szeredif4975c62009-04-02 14:25:34 +0200718 req->out.argpages = 1;
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700719 req->num_pages = 1;
720 req->pages[0] = page;
Maxim Patlasov85f40ae2012-10-26 19:49:33 +0400721 req->page_descs[0].length = count;
Maxim Patlasov36cf66e2012-12-14 19:20:51 +0400722 num_read = fuse_send_read(req, &io, pos, count, NULL);
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700723 err = req->out.h.error;
Miklos Szeredi5c5c5e52008-04-30 00:54:43 -0700724
725 if (!err) {
726 /*
727 * Short read means EOF. If file size is larger, truncate it
728 */
729 if (num_read < count)
Pavel Emelyanova92adc82013-10-10 17:10:16 +0400730 fuse_short_read(req, inode, attr_ver);
Miklos Szeredi5c5c5e52008-04-30 00:54:43 -0700731
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700732 SetPageUptodate(page);
Miklos Szeredi5c5c5e52008-04-30 00:54:43 -0700733 }
734
Pavel Emelyanova92adc82013-10-10 17:10:16 +0400735 fuse_put_request(fc, req);
Maxim Patlasov482fce52013-10-10 17:11:25 +0400736
737 return err;
738}
739
740static int fuse_readpage(struct file *file, struct page *page)
741{
742 struct inode *inode = page->mapping->host;
743 int err;
744
745 err = -EIO;
746 if (is_bad_inode(inode))
747 goto out;
748
749 err = fuse_do_readpage(file, page);
Andrew Gallagher451418f2013-11-05 03:55:43 -0800750 fuse_invalidate_atime(inode);
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700751 out:
752 unlock_page(page);
753 return err;
754}
755
Miklos Szeredic1aa96a2006-01-16 22:14:46 -0800756static void fuse_readpages_end(struct fuse_conn *fc, struct fuse_req *req)
Miklos Szeredidb50b962005-09-09 13:10:33 -0700757{
Miklos Szeredic1aa96a2006-01-16 22:14:46 -0800758 int i;
Miklos Szeredi5c5c5e52008-04-30 00:54:43 -0700759 size_t count = req->misc.read.in.size;
760 size_t num_read = req->out.args[0].size;
Miklos Szeredice534fb2010-05-25 15:06:07 +0200761 struct address_space *mapping = NULL;
Miklos Szeredic1aa96a2006-01-16 22:14:46 -0800762
Miklos Szeredice534fb2010-05-25 15:06:07 +0200763 for (i = 0; mapping == NULL && i < req->num_pages; i++)
764 mapping = req->pages[i]->mapping;
765
766 if (mapping) {
767 struct inode *inode = mapping->host;
768
769 /*
770 * Short read means EOF. If file size is larger, truncate it
771 */
Pavel Emelyanova92adc82013-10-10 17:10:16 +0400772 if (!req->out.h.error && num_read < count)
773 fuse_short_read(req, inode, req->misc.read.attr_ver);
Miklos Szeredice534fb2010-05-25 15:06:07 +0200774
Andrew Gallagher451418f2013-11-05 03:55:43 -0800775 fuse_invalidate_atime(inode);
Miklos Szeredi5c5c5e52008-04-30 00:54:43 -0700776 }
777
Miklos Szeredidb50b962005-09-09 13:10:33 -0700778 for (i = 0; i < req->num_pages; i++) {
779 struct page *page = req->pages[i];
780 if (!req->out.h.error)
781 SetPageUptodate(page);
Miklos Szeredic1aa96a2006-01-16 22:14:46 -0800782 else
783 SetPageError(page);
Miklos Szeredidb50b962005-09-09 13:10:33 -0700784 unlock_page(page);
Miklos Szeredib5dd3282010-05-25 15:06:06 +0200785 page_cache_release(page);
Miklos Szeredidb50b962005-09-09 13:10:33 -0700786 }
Miklos Szeredic756e0a2007-10-16 23:31:00 -0700787 if (req->ff)
Miklos Szeredi5a18ec12011-02-25 14:44:58 +0100788 fuse_file_put(req->ff, false);
Miklos Szeredic1aa96a2006-01-16 22:14:46 -0800789}
790
Miklos Szeredi2106cb12009-04-28 16:56:37 +0200791static void fuse_send_readpages(struct fuse_req *req, struct file *file)
Miklos Szeredic1aa96a2006-01-16 22:14:46 -0800792{
Miklos Szeredi2106cb12009-04-28 16:56:37 +0200793 struct fuse_file *ff = file->private_data;
794 struct fuse_conn *fc = ff->fc;
Miklos Szeredic1aa96a2006-01-16 22:14:46 -0800795 loff_t pos = page_offset(req->pages[0]);
796 size_t count = req->num_pages << PAGE_CACHE_SHIFT;
Miklos Szeredif4975c62009-04-02 14:25:34 +0200797
798 req->out.argpages = 1;
Miklos Szeredic1aa96a2006-01-16 22:14:46 -0800799 req->out.page_zeroing = 1;
Miklos Szeredice534fb2010-05-25 15:06:07 +0200800 req->out.page_replace = 1;
Miklos Szeredi2106cb12009-04-28 16:56:37 +0200801 fuse_read_fill(req, file, pos, count, FUSE_READ);
Miklos Szeredi5c5c5e52008-04-30 00:54:43 -0700802 req->misc.read.attr_ver = fuse_get_attr_version(fc);
Miklos Szeredi9cd68452006-02-01 03:04:40 -0800803 if (fc->async_read) {
Miklos Szeredic756e0a2007-10-16 23:31:00 -0700804 req->ff = fuse_file_get(ff);
Miklos Szeredi9cd68452006-02-01 03:04:40 -0800805 req->end = fuse_readpages_end;
Tejun Heob93f8582008-11-26 12:03:55 +0100806 fuse_request_send_background(fc, req);
Miklos Szeredi9cd68452006-02-01 03:04:40 -0800807 } else {
Tejun Heob93f8582008-11-26 12:03:55 +0100808 fuse_request_send(fc, req);
Miklos Szeredi9cd68452006-02-01 03:04:40 -0800809 fuse_readpages_end(fc, req);
Tejun Heoe9bb09d2008-11-26 12:03:54 +0100810 fuse_put_request(fc, req);
Miklos Szeredi9cd68452006-02-01 03:04:40 -0800811 }
Miklos Szeredidb50b962005-09-09 13:10:33 -0700812}
813
Miklos Szeredic756e0a2007-10-16 23:31:00 -0700814struct fuse_fill_data {
Miklos Szeredidb50b962005-09-09 13:10:33 -0700815 struct fuse_req *req;
Miklos Szeredia6643092007-11-28 16:22:00 -0800816 struct file *file;
Miklos Szeredidb50b962005-09-09 13:10:33 -0700817 struct inode *inode;
Maxim Patlasovf8dbdf82012-10-26 19:48:51 +0400818 unsigned nr_pages;
Miklos Szeredidb50b962005-09-09 13:10:33 -0700819};
820
821static int fuse_readpages_fill(void *_data, struct page *page)
822{
Miklos Szeredic756e0a2007-10-16 23:31:00 -0700823 struct fuse_fill_data *data = _data;
Miklos Szeredidb50b962005-09-09 13:10:33 -0700824 struct fuse_req *req = data->req;
825 struct inode *inode = data->inode;
826 struct fuse_conn *fc = get_fuse_conn(inode);
827
Miklos Szeredi3be5a522008-04-30 00:54:41 -0700828 fuse_wait_on_page_writeback(inode, page->index);
829
Miklos Szeredidb50b962005-09-09 13:10:33 -0700830 if (req->num_pages &&
831 (req->num_pages == FUSE_MAX_PAGES_PER_REQ ||
832 (req->num_pages + 1) * PAGE_CACHE_SIZE > fc->max_read ||
833 req->pages[req->num_pages - 1]->index + 1 != page->index)) {
Maxim Patlasovf8dbdf82012-10-26 19:48:51 +0400834 int nr_alloc = min_t(unsigned, data->nr_pages,
835 FUSE_MAX_PAGES_PER_REQ);
Miklos Szeredi2106cb12009-04-28 16:56:37 +0200836 fuse_send_readpages(req, data->file);
Maxim Patlasov8b41e672013-03-21 18:02:04 +0400837 if (fc->async_read)
838 req = fuse_get_req_for_background(fc, nr_alloc);
839 else
840 req = fuse_get_req(fc, nr_alloc);
841
842 data->req = req;
Miklos Szeredice1d5a42006-04-10 22:54:58 -0700843 if (IS_ERR(req)) {
Miklos Szeredidb50b962005-09-09 13:10:33 -0700844 unlock_page(page);
Miklos Szeredice1d5a42006-04-10 22:54:58 -0700845 return PTR_ERR(req);
Miklos Szeredidb50b962005-09-09 13:10:33 -0700846 }
Miklos Szeredidb50b962005-09-09 13:10:33 -0700847 }
Maxim Patlasovf8dbdf82012-10-26 19:48:51 +0400848
849 if (WARN_ON(req->num_pages >= req->max_pages)) {
850 fuse_put_request(fc, req);
851 return -EIO;
852 }
853
Miklos Szeredib5dd3282010-05-25 15:06:06 +0200854 page_cache_get(page);
Miklos Szeredidb50b962005-09-09 13:10:33 -0700855 req->pages[req->num_pages] = page;
Maxim Patlasov85f40ae2012-10-26 19:49:33 +0400856 req->page_descs[req->num_pages].length = PAGE_SIZE;
Miklos Szeredi1729a162008-11-26 12:03:54 +0100857 req->num_pages++;
Maxim Patlasovf8dbdf82012-10-26 19:48:51 +0400858 data->nr_pages--;
Miklos Szeredidb50b962005-09-09 13:10:33 -0700859 return 0;
860}
861
862static int fuse_readpages(struct file *file, struct address_space *mapping,
863 struct list_head *pages, unsigned nr_pages)
864{
865 struct inode *inode = mapping->host;
866 struct fuse_conn *fc = get_fuse_conn(inode);
Miklos Szeredic756e0a2007-10-16 23:31:00 -0700867 struct fuse_fill_data data;
Miklos Szeredidb50b962005-09-09 13:10:33 -0700868 int err;
Maxim Patlasovf8dbdf82012-10-26 19:48:51 +0400869 int nr_alloc = min_t(unsigned, nr_pages, FUSE_MAX_PAGES_PER_REQ);
Miklos Szeredi248d86e2006-01-06 00:19:39 -0800870
Alexander Zarochentsev1d7ea732006-08-13 23:24:27 -0700871 err = -EIO;
Miklos Szeredi248d86e2006-01-06 00:19:39 -0800872 if (is_bad_inode(inode))
OGAWA Hirofumi2e990022006-11-02 22:07:09 -0800873 goto out;
Miklos Szeredi248d86e2006-01-06 00:19:39 -0800874
Miklos Szeredia6643092007-11-28 16:22:00 -0800875 data.file = file;
Miklos Szeredidb50b962005-09-09 13:10:33 -0700876 data.inode = inode;
Maxim Patlasov8b41e672013-03-21 18:02:04 +0400877 if (fc->async_read)
878 data.req = fuse_get_req_for_background(fc, nr_alloc);
879 else
880 data.req = fuse_get_req(fc, nr_alloc);
Maxim Patlasovf8dbdf82012-10-26 19:48:51 +0400881 data.nr_pages = nr_pages;
Alexander Zarochentsev1d7ea732006-08-13 23:24:27 -0700882 err = PTR_ERR(data.req);
Miklos Szeredice1d5a42006-04-10 22:54:58 -0700883 if (IS_ERR(data.req))
OGAWA Hirofumi2e990022006-11-02 22:07:09 -0800884 goto out;
Miklos Szeredidb50b962005-09-09 13:10:33 -0700885
886 err = read_cache_pages(mapping, pages, fuse_readpages_fill, &data);
Miklos Szeredid3406ff2006-04-10 22:54:49 -0700887 if (!err) {
888 if (data.req->num_pages)
Miklos Szeredi2106cb12009-04-28 16:56:37 +0200889 fuse_send_readpages(data.req, file);
Miklos Szeredid3406ff2006-04-10 22:54:49 -0700890 else
891 fuse_put_request(fc, data.req);
892 }
OGAWA Hirofumi2e990022006-11-02 22:07:09 -0800893out:
Alexander Zarochentsev1d7ea732006-08-13 23:24:27 -0700894 return err;
Miklos Szeredidb50b962005-09-09 13:10:33 -0700895}
896
Al Viro37c20f12014-04-02 14:47:09 -0400897static ssize_t fuse_file_read_iter(struct kiocb *iocb, struct iov_iter *to)
Miklos Szeredibcb4be82007-11-28 16:21:59 -0800898{
899 struct inode *inode = iocb->ki_filp->f_mapping->host;
Brian Fostera8894272012-07-16 15:23:50 -0400900 struct fuse_conn *fc = get_fuse_conn(inode);
Miklos Szeredibcb4be82007-11-28 16:21:59 -0800901
Brian Fostera8894272012-07-16 15:23:50 -0400902 /*
903 * In auto invalidate mode, always update attributes on read.
904 * Otherwise, only update if we attempt to read past EOF (to ensure
905 * i_size is up to date).
906 */
907 if (fc->auto_inval_data ||
Al Viro37c20f12014-04-02 14:47:09 -0400908 (iocb->ki_pos + iov_iter_count(to) > i_size_read(inode))) {
Miklos Szeredibcb4be82007-11-28 16:21:59 -0800909 int err;
Miklos Szeredibcb4be82007-11-28 16:21:59 -0800910 err = fuse_update_attributes(inode, NULL, iocb->ki_filp, NULL);
911 if (err)
912 return err;
913 }
914
Al Viro37c20f12014-04-02 14:47:09 -0400915 return generic_file_read_iter(iocb, to);
Miklos Szeredibcb4be82007-11-28 16:21:59 -0800916}
917
Miklos Szeredi2d698b02009-04-28 16:56:36 +0200918static void fuse_write_fill(struct fuse_req *req, struct fuse_file *ff,
Miklos Szeredi2106cb12009-04-28 16:56:37 +0200919 loff_t pos, size_t count)
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700920{
Miklos Szeredib25e82e2007-10-18 03:07:03 -0700921 struct fuse_write_in *inarg = &req->misc.write.in;
922 struct fuse_write_out *outarg = &req->misc.write.out;
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700923
Miklos Szeredib25e82e2007-10-18 03:07:03 -0700924 inarg->fh = ff->fh;
925 inarg->offset = pos;
926 inarg->size = count;
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700927 req->in.h.opcode = FUSE_WRITE;
Miklos Szeredi2106cb12009-04-28 16:56:37 +0200928 req->in.h.nodeid = ff->nodeid;
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700929 req->in.numargs = 2;
Miklos Szeredi2106cb12009-04-28 16:56:37 +0200930 if (ff->fc->minor < 9)
Miklos Szeredif3332112007-10-18 03:07:04 -0700931 req->in.args[0].size = FUSE_COMPAT_WRITE_IN_SIZE;
932 else
933 req->in.args[0].size = sizeof(struct fuse_write_in);
Miklos Szeredib25e82e2007-10-18 03:07:03 -0700934 req->in.args[0].value = inarg;
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700935 req->in.args[1].size = count;
936 req->out.numargs = 1;
937 req->out.args[0].size = sizeof(struct fuse_write_out);
Miklos Szeredib25e82e2007-10-18 03:07:03 -0700938 req->out.args[0].value = outarg;
939}
940
Maxim Patlasov36cf66e2012-12-14 19:20:51 +0400941static size_t fuse_send_write(struct fuse_req *req, struct fuse_io_priv *io,
Miklos Szeredi2106cb12009-04-28 16:56:37 +0200942 loff_t pos, size_t count, fl_owner_t owner)
Miklos Szeredib25e82e2007-10-18 03:07:03 -0700943{
Maxim Patlasov36cf66e2012-12-14 19:20:51 +0400944 struct file *file = io->file;
Miklos Szeredi2106cb12009-04-28 16:56:37 +0200945 struct fuse_file *ff = file->private_data;
946 struct fuse_conn *fc = ff->fc;
Miklos Szeredi2d698b02009-04-28 16:56:36 +0200947 struct fuse_write_in *inarg = &req->misc.write.in;
948
Miklos Szeredi2106cb12009-04-28 16:56:37 +0200949 fuse_write_fill(req, ff, pos, count);
Miklos Szeredi2d698b02009-04-28 16:56:36 +0200950 inarg->flags = file->f_flags;
Miklos Szeredif3332112007-10-18 03:07:04 -0700951 if (owner != NULL) {
Miklos Szeredif3332112007-10-18 03:07:04 -0700952 inarg->write_flags |= FUSE_WRITE_LOCKOWNER;
953 inarg->lock_owner = fuse_lock_owner_id(fc, owner);
954 }
Maxim Patlasov36cf66e2012-12-14 19:20:51 +0400955
956 if (io->async)
957 return fuse_async_req_send(fc, req, count, io);
958
Tejun Heob93f8582008-11-26 12:03:55 +0100959 fuse_request_send(fc, req);
Miklos Szeredib25e82e2007-10-18 03:07:03 -0700960 return req->misc.write.out.size;
Miklos Szeredib6aeade2005-09-09 13:10:30 -0700961}
962
Maxim Patlasovb0aa7602013-12-26 19:51:11 +0400963bool fuse_write_update_size(struct inode *inode, loff_t pos)
Miklos Szeredi854512e2008-04-30 00:54:41 -0700964{
965 struct fuse_conn *fc = get_fuse_conn(inode);
966 struct fuse_inode *fi = get_fuse_inode(inode);
Maxim Patlasovb0aa7602013-12-26 19:51:11 +0400967 bool ret = false;
Miklos Szeredi854512e2008-04-30 00:54:41 -0700968
969 spin_lock(&fc->lock);
970 fi->attr_version = ++fc->attr_version;
Maxim Patlasovb0aa7602013-12-26 19:51:11 +0400971 if (pos > inode->i_size) {
Miklos Szeredi854512e2008-04-30 00:54:41 -0700972 i_size_write(inode, pos);
Maxim Patlasovb0aa7602013-12-26 19:51:11 +0400973 ret = true;
974 }
Miklos Szeredi854512e2008-04-30 00:54:41 -0700975 spin_unlock(&fc->lock);
Maxim Patlasovb0aa7602013-12-26 19:51:11 +0400976
977 return ret;
Miklos Szeredi854512e2008-04-30 00:54:41 -0700978}
979
Nick Pigginea9b9902008-04-30 00:54:42 -0700980static size_t fuse_send_write_pages(struct fuse_req *req, struct file *file,
981 struct inode *inode, loff_t pos,
982 size_t count)
983{
984 size_t res;
985 unsigned offset;
986 unsigned i;
Maxim Patlasov36cf66e2012-12-14 19:20:51 +0400987 struct fuse_io_priv io = { .async = 0, .file = file };
Nick Pigginea9b9902008-04-30 00:54:42 -0700988
989 for (i = 0; i < req->num_pages; i++)
990 fuse_wait_on_page_writeback(inode, req->pages[i]->index);
991
Maxim Patlasov36cf66e2012-12-14 19:20:51 +0400992 res = fuse_send_write(req, &io, pos, count, NULL);
Nick Pigginea9b9902008-04-30 00:54:42 -0700993
Maxim Patlasovb2430d72012-10-26 19:49:24 +0400994 offset = req->page_descs[0].offset;
Nick Pigginea9b9902008-04-30 00:54:42 -0700995 count = res;
996 for (i = 0; i < req->num_pages; i++) {
997 struct page *page = req->pages[i];
998
999 if (!req->out.h.error && !offset && count >= PAGE_CACHE_SIZE)
1000 SetPageUptodate(page);
1001
1002 if (count > PAGE_CACHE_SIZE - offset)
1003 count -= PAGE_CACHE_SIZE - offset;
1004 else
1005 count = 0;
1006 offset = 0;
1007
1008 unlock_page(page);
1009 page_cache_release(page);
1010 }
1011
1012 return res;
1013}
1014
1015static ssize_t fuse_fill_write_pages(struct fuse_req *req,
1016 struct address_space *mapping,
1017 struct iov_iter *ii, loff_t pos)
1018{
1019 struct fuse_conn *fc = get_fuse_conn(mapping->host);
1020 unsigned offset = pos & (PAGE_CACHE_SIZE - 1);
1021 size_t count = 0;
1022 int err;
1023
Miklos Szeredif4975c62009-04-02 14:25:34 +02001024 req->in.argpages = 1;
Maxim Patlasovb2430d72012-10-26 19:49:24 +04001025 req->page_descs[0].offset = offset;
Nick Pigginea9b9902008-04-30 00:54:42 -07001026
1027 do {
1028 size_t tmp;
1029 struct page *page;
1030 pgoff_t index = pos >> PAGE_CACHE_SHIFT;
1031 size_t bytes = min_t(size_t, PAGE_CACHE_SIZE - offset,
1032 iov_iter_count(ii));
1033
1034 bytes = min_t(size_t, bytes, fc->max_write - count);
1035
1036 again:
1037 err = -EFAULT;
1038 if (iov_iter_fault_in_readable(ii, bytes))
1039 break;
1040
1041 err = -ENOMEM;
Nick Piggin54566b22009-01-04 12:00:53 -08001042 page = grab_cache_page_write_begin(mapping, index, 0);
Nick Pigginea9b9902008-04-30 00:54:42 -07001043 if (!page)
1044 break;
1045
anfei zhou931e80e2010-02-02 13:44:02 -08001046 if (mapping_writably_mapped(mapping))
1047 flush_dcache_page(page);
1048
Nick Pigginea9b9902008-04-30 00:54:42 -07001049 tmp = iov_iter_copy_from_user_atomic(page, ii, offset, bytes);
Nick Pigginea9b9902008-04-30 00:54:42 -07001050 flush_dcache_page(page);
1051
1052 if (!tmp) {
1053 unlock_page(page);
1054 page_cache_release(page);
1055 bytes = min(bytes, iov_iter_single_seg_count(ii));
1056 goto again;
1057 }
1058
1059 err = 0;
1060 req->pages[req->num_pages] = page;
Maxim Patlasov85f40ae2012-10-26 19:49:33 +04001061 req->page_descs[req->num_pages].length = tmp;
Nick Pigginea9b9902008-04-30 00:54:42 -07001062 req->num_pages++;
1063
1064 iov_iter_advance(ii, tmp);
1065 count += tmp;
1066 pos += tmp;
1067 offset += tmp;
1068 if (offset == PAGE_CACHE_SIZE)
1069 offset = 0;
1070
Miklos Szeredi78bb6cb2008-05-12 14:02:32 -07001071 if (!fc->big_writes)
1072 break;
Nick Pigginea9b9902008-04-30 00:54:42 -07001073 } while (iov_iter_count(ii) && count < fc->max_write &&
Maxim Patlasovd07f09f2012-10-26 19:49:00 +04001074 req->num_pages < req->max_pages && offset == 0);
Nick Pigginea9b9902008-04-30 00:54:42 -07001075
1076 return count > 0 ? count : err;
1077}
1078
Maxim Patlasovd07f09f2012-10-26 19:49:00 +04001079static inline unsigned fuse_wr_pages(loff_t pos, size_t len)
1080{
1081 return min_t(unsigned,
1082 ((pos + len - 1) >> PAGE_CACHE_SHIFT) -
1083 (pos >> PAGE_CACHE_SHIFT) + 1,
1084 FUSE_MAX_PAGES_PER_REQ);
1085}
1086
Nick Pigginea9b9902008-04-30 00:54:42 -07001087static ssize_t fuse_perform_write(struct file *file,
1088 struct address_space *mapping,
1089 struct iov_iter *ii, loff_t pos)
1090{
1091 struct inode *inode = mapping->host;
1092 struct fuse_conn *fc = get_fuse_conn(inode);
Maxim Patlasov06a7c3c2013-08-30 17:06:04 +04001093 struct fuse_inode *fi = get_fuse_inode(inode);
Nick Pigginea9b9902008-04-30 00:54:42 -07001094 int err = 0;
1095 ssize_t res = 0;
1096
1097 if (is_bad_inode(inode))
1098 return -EIO;
1099
Maxim Patlasov06a7c3c2013-08-30 17:06:04 +04001100 if (inode->i_size < pos + iov_iter_count(ii))
1101 set_bit(FUSE_I_SIZE_UNSTABLE, &fi->state);
1102
Nick Pigginea9b9902008-04-30 00:54:42 -07001103 do {
1104 struct fuse_req *req;
1105 ssize_t count;
Maxim Patlasovd07f09f2012-10-26 19:49:00 +04001106 unsigned nr_pages = fuse_wr_pages(pos, iov_iter_count(ii));
Nick Pigginea9b9902008-04-30 00:54:42 -07001107
Maxim Patlasovd07f09f2012-10-26 19:49:00 +04001108 req = fuse_get_req(fc, nr_pages);
Nick Pigginea9b9902008-04-30 00:54:42 -07001109 if (IS_ERR(req)) {
1110 err = PTR_ERR(req);
1111 break;
1112 }
1113
1114 count = fuse_fill_write_pages(req, mapping, ii, pos);
1115 if (count <= 0) {
1116 err = count;
1117 } else {
1118 size_t num_written;
1119
1120 num_written = fuse_send_write_pages(req, file, inode,
1121 pos, count);
1122 err = req->out.h.error;
1123 if (!err) {
1124 res += num_written;
1125 pos += num_written;
1126
1127 /* break out of the loop on short write */
1128 if (num_written != count)
1129 err = -EIO;
1130 }
1131 }
1132 fuse_put_request(fc, req);
1133 } while (!err && iov_iter_count(ii));
1134
1135 if (res > 0)
1136 fuse_write_update_size(inode, pos);
1137
Maxim Patlasov06a7c3c2013-08-30 17:06:04 +04001138 clear_bit(FUSE_I_SIZE_UNSTABLE, &fi->state);
Nick Pigginea9b9902008-04-30 00:54:42 -07001139 fuse_invalidate_attr(inode);
1140
1141 return res > 0 ? res : err;
1142}
1143
Al Viro84c3d552014-04-03 14:33:23 -04001144static ssize_t fuse_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
Nick Pigginea9b9902008-04-30 00:54:42 -07001145{
1146 struct file *file = iocb->ki_filp;
1147 struct address_space *mapping = file->f_mapping;
Nick Pigginea9b9902008-04-30 00:54:42 -07001148 ssize_t written = 0;
Anand Avati4273b792012-02-17 12:46:25 -05001149 ssize_t written_buffered = 0;
Nick Pigginea9b9902008-04-30 00:54:42 -07001150 struct inode *inode = mapping->host;
1151 ssize_t err;
Anand Avati4273b792012-02-17 12:46:25 -05001152 loff_t endbyte = 0;
Nick Pigginea9b9902008-04-30 00:54:42 -07001153
Pavel Emelyanov4d99ff82013-10-10 17:12:18 +04001154 if (get_fuse_conn(inode)->writeback_cache) {
1155 /* Update size (EOF optimization) and mode (SUID clearing) */
1156 err = fuse_update_attributes(mapping->host, NULL, file, NULL);
1157 if (err)
1158 return err;
1159
Al Viro84c3d552014-04-03 14:33:23 -04001160 return generic_file_write_iter(iocb, from);
Pavel Emelyanov4d99ff82013-10-10 17:12:18 +04001161 }
1162
Nick Pigginea9b9902008-04-30 00:54:42 -07001163 mutex_lock(&inode->i_mutex);
Nick Pigginea9b9902008-04-30 00:54:42 -07001164
1165 /* We can write back this queue in page reclaim */
Christoph Hellwigde1414a2015-01-14 10:42:36 +01001166 current->backing_dev_info = inode_to_bdi(inode);
Nick Pigginea9b9902008-04-30 00:54:42 -07001167
Al Viro3309dd02015-04-09 12:55:47 -04001168 err = generic_write_checks(iocb, from);
1169 if (err <= 0)
Nick Pigginea9b9902008-04-30 00:54:42 -07001170 goto out;
1171
Jan Kara5fa8e0a2015-05-21 16:05:53 +02001172 err = file_remove_privs(file);
Nick Pigginea9b9902008-04-30 00:54:42 -07001173 if (err)
1174 goto out;
1175
Josef Bacikc3b2da32012-03-26 09:59:21 -04001176 err = file_update_time(file);
1177 if (err)
1178 goto out;
Nick Pigginea9b9902008-04-30 00:54:42 -07001179
Al Viro2ba48ce2015-04-09 13:52:01 -04001180 if (iocb->ki_flags & IOCB_DIRECT) {
Al Viro3309dd02015-04-09 12:55:47 -04001181 loff_t pos = iocb->ki_pos;
Al Viro84c3d552014-04-03 14:33:23 -04001182 written = generic_file_direct_write(iocb, from, pos);
1183 if (written < 0 || !iov_iter_count(from))
Anand Avati4273b792012-02-17 12:46:25 -05001184 goto out;
Nick Pigginea9b9902008-04-30 00:54:42 -07001185
Anand Avati4273b792012-02-17 12:46:25 -05001186 pos += written;
Anand Avati4273b792012-02-17 12:46:25 -05001187
Al Viro84c3d552014-04-03 14:33:23 -04001188 written_buffered = fuse_perform_write(file, mapping, from, pos);
Anand Avati4273b792012-02-17 12:46:25 -05001189 if (written_buffered < 0) {
1190 err = written_buffered;
1191 goto out;
1192 }
1193 endbyte = pos + written_buffered - 1;
1194
1195 err = filemap_write_and_wait_range(file->f_mapping, pos,
1196 endbyte);
1197 if (err)
1198 goto out;
1199
1200 invalidate_mapping_pages(file->f_mapping,
1201 pos >> PAGE_CACHE_SHIFT,
1202 endbyte >> PAGE_CACHE_SHIFT);
1203
1204 written += written_buffered;
1205 iocb->ki_pos = pos + written_buffered;
1206 } else {
Al Viro3309dd02015-04-09 12:55:47 -04001207 written = fuse_perform_write(file, mapping, from, iocb->ki_pos);
Anand Avati4273b792012-02-17 12:46:25 -05001208 if (written >= 0)
Al Viro3309dd02015-04-09 12:55:47 -04001209 iocb->ki_pos += written;
Anand Avati4273b792012-02-17 12:46:25 -05001210 }
Nick Pigginea9b9902008-04-30 00:54:42 -07001211out:
1212 current->backing_dev_info = NULL;
1213 mutex_unlock(&inode->i_mutex);
1214
1215 return written ? written : err;
1216}
1217
Maxim Patlasov7c190c82012-10-26 19:50:29 +04001218static inline void fuse_page_descs_length_init(struct fuse_req *req,
1219 unsigned index, unsigned nr_pages)
Maxim Patlasov85f40ae2012-10-26 19:49:33 +04001220{
1221 int i;
1222
Maxim Patlasov7c190c82012-10-26 19:50:29 +04001223 for (i = index; i < index + nr_pages; i++)
Maxim Patlasov85f40ae2012-10-26 19:49:33 +04001224 req->page_descs[i].length = PAGE_SIZE -
1225 req->page_descs[i].offset;
1226}
1227
Maxim Patlasov7c190c82012-10-26 19:50:29 +04001228static inline unsigned long fuse_get_user_addr(const struct iov_iter *ii)
1229{
1230 return (unsigned long)ii->iov->iov_base + ii->iov_offset;
1231}
1232
1233static inline size_t fuse_get_frag_size(const struct iov_iter *ii,
1234 size_t max_size)
1235{
1236 return min(iov_iter_single_seg_count(ii), max_size);
1237}
1238
Maxim Patlasovb98d0232012-10-26 19:50:15 +04001239static int fuse_get_user_pages(struct fuse_req *req, struct iov_iter *ii,
Miklos Szeredice60a2f2009-04-09 17:37:52 +02001240 size_t *nbytesp, int write)
Miklos Szeredi413ef8c2005-09-09 13:10:35 -07001241{
Maxim Patlasov7c190c82012-10-26 19:50:29 +04001242 size_t nbytes = 0; /* # bytes already packed in req */
Maxim Patlasovb98d0232012-10-26 19:50:15 +04001243
Miklos Szeredif4975c62009-04-02 14:25:34 +02001244 /* Special case for kernel I/O: can copy directly into the buffer */
Al Viro62a80672014-04-04 23:12:29 -04001245 if (ii->type & ITER_KVEC) {
Maxim Patlasov7c190c82012-10-26 19:50:29 +04001246 unsigned long user_addr = fuse_get_user_addr(ii);
1247 size_t frag_size = fuse_get_frag_size(ii, *nbytesp);
1248
Miklos Szeredif4975c62009-04-02 14:25:34 +02001249 if (write)
1250 req->in.args[1].value = (void *) user_addr;
1251 else
1252 req->out.args[0].value = (void *) user_addr;
1253
Maxim Patlasovb98d0232012-10-26 19:50:15 +04001254 iov_iter_advance(ii, frag_size);
1255 *nbytesp = frag_size;
Miklos Szeredif4975c62009-04-02 14:25:34 +02001256 return 0;
1257 }
Miklos Szeredi413ef8c2005-09-09 13:10:35 -07001258
Maxim Patlasov5565a9d2012-10-26 19:50:36 +04001259 while (nbytes < *nbytesp && req->num_pages < req->max_pages) {
Maxim Patlasov7c190c82012-10-26 19:50:29 +04001260 unsigned npages;
Al Virof67da302014-03-19 01:16:16 -04001261 size_t start;
Al Viroc9c37e22014-03-16 16:08:30 -04001262 ssize_t ret = iov_iter_get_pages(ii,
1263 &req->pages[req->num_pages],
Miklos Szeredi2c809292014-09-24 17:09:11 +02001264 *nbytesp - nbytes,
Al Viroc7f38882014-06-18 20:34:33 -04001265 req->max_pages - req->num_pages,
1266 &start);
Maxim Patlasov7c190c82012-10-26 19:50:29 +04001267 if (ret < 0)
1268 return ret;
1269
Al Viroc9c37e22014-03-16 16:08:30 -04001270 iov_iter_advance(ii, ret);
1271 nbytes += ret;
Maxim Patlasov7c190c82012-10-26 19:50:29 +04001272
Al Viroc9c37e22014-03-16 16:08:30 -04001273 ret += start;
1274 npages = (ret + PAGE_SIZE - 1) / PAGE_SIZE;
1275
1276 req->page_descs[req->num_pages].offset = start;
Maxim Patlasov7c190c82012-10-26 19:50:29 +04001277 fuse_page_descs_length_init(req, req->num_pages, npages);
1278
1279 req->num_pages += npages;
1280 req->page_descs[req->num_pages - 1].length -=
Al Viroc9c37e22014-03-16 16:08:30 -04001281 (PAGE_SIZE - ret) & (PAGE_SIZE - 1);
Maxim Patlasov7c190c82012-10-26 19:50:29 +04001282 }
Miklos Szeredif4975c62009-04-02 14:25:34 +02001283
1284 if (write)
1285 req->in.argpages = 1;
1286 else
1287 req->out.argpages = 1;
1288
Maxim Patlasov7c190c82012-10-26 19:50:29 +04001289 *nbytesp = nbytes;
Miklos Szeredif4975c62009-04-02 14:25:34 +02001290
Miklos Szeredi413ef8c2005-09-09 13:10:35 -07001291 return 0;
1292}
1293
Maxim Patlasov5565a9d2012-10-26 19:50:36 +04001294static inline int fuse_iter_npages(const struct iov_iter *ii_p)
1295{
Al Virof67da302014-03-19 01:16:16 -04001296 return iov_iter_npages(ii_p, FUSE_MAX_PAGES_PER_REQ);
Maxim Patlasov5565a9d2012-10-26 19:50:36 +04001297}
1298
Al Virod22a9432014-03-16 15:50:47 -04001299ssize_t fuse_direct_io(struct fuse_io_priv *io, struct iov_iter *iter,
1300 loff_t *ppos, int flags)
Miklos Szeredi413ef8c2005-09-09 13:10:35 -07001301{
Pavel Emelyanovea8cd332013-10-10 17:12:05 +04001302 int write = flags & FUSE_DIO_WRITE;
1303 int cuse = flags & FUSE_DIO_CUSE;
Maxim Patlasov36cf66e2012-12-14 19:20:51 +04001304 struct file *file = io->file;
Pavel Emelyanovea8cd332013-10-10 17:12:05 +04001305 struct inode *inode = file->f_mapping->host;
Miklos Szeredi2106cb12009-04-28 16:56:37 +02001306 struct fuse_file *ff = file->private_data;
1307 struct fuse_conn *fc = ff->fc;
Miklos Szeredi413ef8c2005-09-09 13:10:35 -07001308 size_t nmax = write ? fc->max_write : fc->max_read;
1309 loff_t pos = *ppos;
Al Virod22a9432014-03-16 15:50:47 -04001310 size_t count = iov_iter_count(iter);
Pavel Emelyanovea8cd332013-10-10 17:12:05 +04001311 pgoff_t idx_from = pos >> PAGE_CACHE_SHIFT;
1312 pgoff_t idx_to = (pos + count - 1) >> PAGE_CACHE_SHIFT;
Miklos Szeredi413ef8c2005-09-09 13:10:35 -07001313 ssize_t res = 0;
Miklos Szeredi248d86e2006-01-06 00:19:39 -08001314 struct fuse_req *req;
1315
Brian Fosterde82b922013-05-14 11:25:39 -04001316 if (io->async)
Al Virod22a9432014-03-16 15:50:47 -04001317 req = fuse_get_req_for_background(fc, fuse_iter_npages(iter));
Brian Fosterde82b922013-05-14 11:25:39 -04001318 else
Al Virod22a9432014-03-16 15:50:47 -04001319 req = fuse_get_req(fc, fuse_iter_npages(iter));
Miklos Szeredice1d5a42006-04-10 22:54:58 -07001320 if (IS_ERR(req))
1321 return PTR_ERR(req);
Miklos Szeredi413ef8c2005-09-09 13:10:35 -07001322
Pavel Emelyanovea8cd332013-10-10 17:12:05 +04001323 if (!cuse && fuse_range_is_writeback(inode, idx_from, idx_to)) {
1324 if (!write)
1325 mutex_lock(&inode->i_mutex);
1326 fuse_sync_writes(inode);
1327 if (!write)
1328 mutex_unlock(&inode->i_mutex);
1329 }
1330
Miklos Szeredi413ef8c2005-09-09 13:10:35 -07001331 while (count) {
Miklos Szeredi413ef8c2005-09-09 13:10:35 -07001332 size_t nres;
Miklos Szeredi2106cb12009-04-28 16:56:37 +02001333 fl_owner_t owner = current->files;
Miklos Szeredif4975c62009-04-02 14:25:34 +02001334 size_t nbytes = min(count, nmax);
Al Virod22a9432014-03-16 15:50:47 -04001335 int err = fuse_get_user_pages(req, iter, &nbytes, write);
Miklos Szeredi413ef8c2005-09-09 13:10:35 -07001336 if (err) {
1337 res = err;
1338 break;
1339 }
Miklos Szeredif4975c62009-04-02 14:25:34 +02001340
Miklos Szeredi413ef8c2005-09-09 13:10:35 -07001341 if (write)
Maxim Patlasov36cf66e2012-12-14 19:20:51 +04001342 nres = fuse_send_write(req, io, pos, nbytes, owner);
Miklos Szeredi413ef8c2005-09-09 13:10:35 -07001343 else
Maxim Patlasov36cf66e2012-12-14 19:20:51 +04001344 nres = fuse_send_read(req, io, pos, nbytes, owner);
Miklos Szeredi2106cb12009-04-28 16:56:37 +02001345
Maxim Patlasov36cf66e2012-12-14 19:20:51 +04001346 if (!io->async)
1347 fuse_release_user_pages(req, !write);
Miklos Szeredi413ef8c2005-09-09 13:10:35 -07001348 if (req->out.h.error) {
1349 if (!res)
1350 res = req->out.h.error;
1351 break;
1352 } else if (nres > nbytes) {
1353 res = -EIO;
1354 break;
1355 }
1356 count -= nres;
1357 res += nres;
1358 pos += nres;
Miklos Szeredi413ef8c2005-09-09 13:10:35 -07001359 if (nres != nbytes)
1360 break;
Miklos Szeredi56cf34f2006-04-11 21:16:51 +02001361 if (count) {
1362 fuse_put_request(fc, req);
Brian Fosterde82b922013-05-14 11:25:39 -04001363 if (io->async)
1364 req = fuse_get_req_for_background(fc,
Al Virod22a9432014-03-16 15:50:47 -04001365 fuse_iter_npages(iter));
Brian Fosterde82b922013-05-14 11:25:39 -04001366 else
Al Virod22a9432014-03-16 15:50:47 -04001367 req = fuse_get_req(fc, fuse_iter_npages(iter));
Miklos Szeredi56cf34f2006-04-11 21:16:51 +02001368 if (IS_ERR(req))
1369 break;
1370 }
Miklos Szeredi413ef8c2005-09-09 13:10:35 -07001371 }
Anand V. Avatif60311d2009-10-22 06:24:52 -07001372 if (!IS_ERR(req))
1373 fuse_put_request(fc, req);
Miklos Szeredid09cb9d2009-04-28 16:56:36 +02001374 if (res > 0)
Miklos Szeredi413ef8c2005-09-09 13:10:35 -07001375 *ppos = pos;
Miklos Szeredi413ef8c2005-09-09 13:10:35 -07001376
1377 return res;
1378}
Tejun Heo08cbf542009-04-14 10:54:53 +09001379EXPORT_SYMBOL_GPL(fuse_direct_io);
Miklos Szeredi413ef8c2005-09-09 13:10:35 -07001380
Maxim Patlasov36cf66e2012-12-14 19:20:51 +04001381static ssize_t __fuse_direct_read(struct fuse_io_priv *io,
Al Virod22a9432014-03-16 15:50:47 -04001382 struct iov_iter *iter,
1383 loff_t *ppos)
Miklos Szeredi413ef8c2005-09-09 13:10:35 -07001384{
Miklos Szeredid09cb9d2009-04-28 16:56:36 +02001385 ssize_t res;
Maxim Patlasov36cf66e2012-12-14 19:20:51 +04001386 struct file *file = io->file;
Al Viro6131ffa2013-02-27 16:59:05 -05001387 struct inode *inode = file_inode(file);
Miklos Szeredid09cb9d2009-04-28 16:56:36 +02001388
1389 if (is_bad_inode(inode))
1390 return -EIO;
1391
Al Virod22a9432014-03-16 15:50:47 -04001392 res = fuse_direct_io(io, iter, ppos, 0);
Miklos Szeredid09cb9d2009-04-28 16:56:36 +02001393
1394 fuse_invalidate_attr(inode);
1395
1396 return res;
Miklos Szeredi413ef8c2005-09-09 13:10:35 -07001397}
1398
Al Viro15316262015-03-30 22:08:36 -04001399static ssize_t fuse_direct_read_iter(struct kiocb *iocb, struct iov_iter *to)
Maxim Patlasovb98d0232012-10-26 19:50:15 +04001400{
Al Viro15316262015-03-30 22:08:36 -04001401 struct fuse_io_priv io = { .async = 0, .file = iocb->ki_filp };
1402 return __fuse_direct_read(&io, to, &iocb->ki_pos);
Maxim Patlasovb98d0232012-10-26 19:50:15 +04001403}
1404
Al Viro15316262015-03-30 22:08:36 -04001405static ssize_t fuse_direct_write_iter(struct kiocb *iocb, struct iov_iter *from)
Miklos Szeredi413ef8c2005-09-09 13:10:35 -07001406{
Al Viro15316262015-03-30 22:08:36 -04001407 struct file *file = iocb->ki_filp;
Al Viro6131ffa2013-02-27 16:59:05 -05001408 struct inode *inode = file_inode(file);
Maxim Patlasov36cf66e2012-12-14 19:20:51 +04001409 struct fuse_io_priv io = { .async = 0, .file = file };
Al Viro15316262015-03-30 22:08:36 -04001410 ssize_t res;
Miklos Szeredid09cb9d2009-04-28 16:56:36 +02001411
1412 if (is_bad_inode(inode))
1413 return -EIO;
1414
Miklos Szeredi413ef8c2005-09-09 13:10:35 -07001415 /* Don't allow parallel writes to the same file */
Jes Sorensen1b1dcc12006-01-09 15:59:24 -08001416 mutex_lock(&inode->i_mutex);
Al Viro3309dd02015-04-09 12:55:47 -04001417 res = generic_write_checks(iocb, from);
1418 if (res > 0)
Al Viro812408f2015-03-30 22:15:58 -04001419 res = fuse_direct_io(&io, from, &iocb->ki_pos, FUSE_DIO_WRITE);
Al Viro812408f2015-03-30 22:15:58 -04001420 fuse_invalidate_attr(inode);
Maxim Patlasovbcba24c2012-12-14 19:21:08 +04001421 if (res > 0)
Al Viro15316262015-03-30 22:08:36 -04001422 fuse_write_update_size(inode, iocb->ki_pos);
Jes Sorensen1b1dcc12006-01-09 15:59:24 -08001423 mutex_unlock(&inode->i_mutex);
Miklos Szeredid09cb9d2009-04-28 16:56:36 +02001424
Miklos Szeredi413ef8c2005-09-09 13:10:35 -07001425 return res;
1426}
1427
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001428static void fuse_writepage_free(struct fuse_conn *fc, struct fuse_req *req)
Miklos Szeredib6aeade2005-09-09 13:10:30 -07001429{
Pavel Emelyanov385b1262013-06-29 21:42:48 +04001430 int i;
1431
1432 for (i = 0; i < req->num_pages; i++)
1433 __free_page(req->pages[i]);
Miklos Szeredi8b284dc2013-10-01 16:44:53 +02001434
1435 if (req->ff)
1436 fuse_file_put(req->ff, false);
Miklos Szeredib6aeade2005-09-09 13:10:30 -07001437}
1438
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001439static void fuse_writepage_finish(struct fuse_conn *fc, struct fuse_req *req)
Miklos Szeredib6aeade2005-09-09 13:10:30 -07001440{
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001441 struct inode *inode = req->inode;
1442 struct fuse_inode *fi = get_fuse_inode(inode);
Christoph Hellwigde1414a2015-01-14 10:42:36 +01001443 struct backing_dev_info *bdi = inode_to_bdi(inode);
Pavel Emelyanov385b1262013-06-29 21:42:48 +04001444 int i;
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001445
1446 list_del(&req->writepages_entry);
Pavel Emelyanov385b1262013-06-29 21:42:48 +04001447 for (i = 0; i < req->num_pages; i++) {
Tejun Heo93f78d82015-05-22 17:13:27 -04001448 dec_wb_stat(&bdi->wb, WB_WRITEBACK);
Pavel Emelyanov385b1262013-06-29 21:42:48 +04001449 dec_zone_page_state(req->pages[i], NR_WRITEBACK_TEMP);
Tejun Heo93f78d82015-05-22 17:13:27 -04001450 wb_writeout_inc(&bdi->wb);
Pavel Emelyanov385b1262013-06-29 21:42:48 +04001451 }
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001452 wake_up(&fi->page_waitq);
1453}
1454
1455/* Called under fc->lock, may release and reacquire it */
Maxim Patlasov6eaf4782013-10-02 21:38:32 +04001456static void fuse_send_writepage(struct fuse_conn *fc, struct fuse_req *req,
1457 loff_t size)
Miklos Szeredib9ca67b2010-09-07 13:42:41 +02001458__releases(fc->lock)
1459__acquires(fc->lock)
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001460{
1461 struct fuse_inode *fi = get_fuse_inode(req->inode);
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001462 struct fuse_write_in *inarg = &req->misc.write.in;
Pavel Emelyanov385b1262013-06-29 21:42:48 +04001463 __u64 data_size = req->num_pages * PAGE_CACHE_SIZE;
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001464
1465 if (!fc->connected)
1466 goto out_free;
1467
Pavel Emelyanov385b1262013-06-29 21:42:48 +04001468 if (inarg->offset + data_size <= size) {
1469 inarg->size = data_size;
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001470 } else if (inarg->offset < size) {
Pavel Emelyanov385b1262013-06-29 21:42:48 +04001471 inarg->size = size - inarg->offset;
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001472 } else {
1473 /* Got truncated off completely */
1474 goto out_free;
1475 }
1476
1477 req->in.args[1].size = inarg->size;
1478 fi->writectr++;
Tejun Heob93f8582008-11-26 12:03:55 +01001479 fuse_request_send_background_locked(fc, req);
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001480 return;
1481
1482 out_free:
1483 fuse_writepage_finish(fc, req);
1484 spin_unlock(&fc->lock);
1485 fuse_writepage_free(fc, req);
Tejun Heoe9bb09d2008-11-26 12:03:54 +01001486 fuse_put_request(fc, req);
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001487 spin_lock(&fc->lock);
1488}
1489
1490/*
1491 * If fi->writectr is positive (no truncate or fsync going on) send
1492 * all queued writepage requests.
1493 *
1494 * Called with fc->lock
1495 */
1496void fuse_flush_writepages(struct inode *inode)
Miklos Szeredib9ca67b2010-09-07 13:42:41 +02001497__releases(fc->lock)
1498__acquires(fc->lock)
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001499{
1500 struct fuse_conn *fc = get_fuse_conn(inode);
1501 struct fuse_inode *fi = get_fuse_inode(inode);
Maxim Patlasov6eaf4782013-10-02 21:38:32 +04001502 size_t crop = i_size_read(inode);
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001503 struct fuse_req *req;
1504
1505 while (fi->writectr >= 0 && !list_empty(&fi->queued_writes)) {
1506 req = list_entry(fi->queued_writes.next, struct fuse_req, list);
1507 list_del_init(&req->list);
Maxim Patlasov6eaf4782013-10-02 21:38:32 +04001508 fuse_send_writepage(fc, req, crop);
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001509 }
1510}
1511
1512static void fuse_writepage_end(struct fuse_conn *fc, struct fuse_req *req)
1513{
1514 struct inode *inode = req->inode;
1515 struct fuse_inode *fi = get_fuse_inode(inode);
1516
1517 mapping_set_error(inode->i_mapping, req->out.h.error);
1518 spin_lock(&fc->lock);
Miklos Szeredi8b284dc2013-10-01 16:44:53 +02001519 while (req->misc.write.next) {
Maxim Patlasov6eaf4782013-10-02 21:38:32 +04001520 struct fuse_conn *fc = get_fuse_conn(inode);
1521 struct fuse_write_in *inarg = &req->misc.write.in;
Miklos Szeredi8b284dc2013-10-01 16:44:53 +02001522 struct fuse_req *next = req->misc.write.next;
1523 req->misc.write.next = next->misc.write.next;
1524 next->misc.write.next = NULL;
Maxim Patlasovce128de2013-10-02 21:38:54 +04001525 next->ff = fuse_file_get(req->ff);
Miklos Szeredi8b284dc2013-10-01 16:44:53 +02001526 list_add(&next->writepages_entry, &fi->writepages);
Maxim Patlasov6eaf4782013-10-02 21:38:32 +04001527
1528 /*
1529 * Skip fuse_flush_writepages() to make it easy to crop requests
1530 * based on primary request size.
1531 *
1532 * 1st case (trivial): there are no concurrent activities using
1533 * fuse_set/release_nowrite. Then we're on safe side because
1534 * fuse_flush_writepages() would call fuse_send_writepage()
1535 * anyway.
1536 *
1537 * 2nd case: someone called fuse_set_nowrite and it is waiting
1538 * now for completion of all in-flight requests. This happens
1539 * rarely and no more than once per page, so this should be
1540 * okay.
1541 *
1542 * 3rd case: someone (e.g. fuse_do_setattr()) is in the middle
1543 * of fuse_set_nowrite..fuse_release_nowrite section. The fact
1544 * that fuse_set_nowrite returned implies that all in-flight
1545 * requests were completed along with all of their secondary
1546 * requests. Further primary requests are blocked by negative
1547 * writectr. Hence there cannot be any in-flight requests and
1548 * no invocations of fuse_writepage_end() while we're in
1549 * fuse_set_nowrite..fuse_release_nowrite section.
1550 */
1551 fuse_send_writepage(fc, next, inarg->offset + inarg->size);
Miklos Szeredi8b284dc2013-10-01 16:44:53 +02001552 }
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001553 fi->writectr--;
1554 fuse_writepage_finish(fc, req);
1555 spin_unlock(&fc->lock);
1556 fuse_writepage_free(fc, req);
1557}
1558
Miklos Szeredi1e18bda2014-04-28 14:19:23 +02001559static struct fuse_file *__fuse_write_file_get(struct fuse_conn *fc,
1560 struct fuse_inode *fi)
Pavel Emelyanovadcadfa2013-06-29 21:42:20 +04001561{
Miklos Szeredi72523422013-10-01 16:44:52 +02001562 struct fuse_file *ff = NULL;
Pavel Emelyanovadcadfa2013-06-29 21:42:20 +04001563
1564 spin_lock(&fc->lock);
Miklos Szeredi1e18bda2014-04-28 14:19:23 +02001565 if (!list_empty(&fi->write_files)) {
Miklos Szeredi72523422013-10-01 16:44:52 +02001566 ff = list_entry(fi->write_files.next, struct fuse_file,
1567 write_entry);
1568 fuse_file_get(ff);
1569 }
Pavel Emelyanovadcadfa2013-06-29 21:42:20 +04001570 spin_unlock(&fc->lock);
1571
1572 return ff;
1573}
1574
Miklos Szeredi1e18bda2014-04-28 14:19:23 +02001575static struct fuse_file *fuse_write_file_get(struct fuse_conn *fc,
1576 struct fuse_inode *fi)
1577{
1578 struct fuse_file *ff = __fuse_write_file_get(fc, fi);
1579 WARN_ON(!ff);
1580 return ff;
1581}
1582
1583int fuse_write_inode(struct inode *inode, struct writeback_control *wbc)
1584{
1585 struct fuse_conn *fc = get_fuse_conn(inode);
1586 struct fuse_inode *fi = get_fuse_inode(inode);
1587 struct fuse_file *ff;
1588 int err;
1589
1590 ff = __fuse_write_file_get(fc, fi);
Maxim Patlasovab9e13f2014-04-28 14:19:24 +02001591 err = fuse_flush_times(inode, ff);
Miklos Szeredi1e18bda2014-04-28 14:19:23 +02001592 if (ff)
1593 fuse_file_put(ff, 0);
1594
1595 return err;
1596}
1597
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001598static int fuse_writepage_locked(struct page *page)
1599{
1600 struct address_space *mapping = page->mapping;
1601 struct inode *inode = mapping->host;
1602 struct fuse_conn *fc = get_fuse_conn(inode);
1603 struct fuse_inode *fi = get_fuse_inode(inode);
1604 struct fuse_req *req;
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001605 struct page *tmp_page;
Miklos Szeredi72523422013-10-01 16:44:52 +02001606 int error = -ENOMEM;
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001607
1608 set_page_writeback(page);
1609
Maxim Patlasov4250c062012-10-26 19:48:07 +04001610 req = fuse_request_alloc_nofs(1);
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001611 if (!req)
1612 goto err;
1613
Miklos Szeredi825d6d32015-07-01 16:25:58 +02001614 /* writeback always goes to bg_queue */
1615 __set_bit(FR_BACKGROUND, &req->flags);
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001616 tmp_page = alloc_page(GFP_NOFS | __GFP_HIGHMEM);
1617 if (!tmp_page)
1618 goto err_free;
1619
Miklos Szeredi72523422013-10-01 16:44:52 +02001620 error = -EIO;
Pavel Emelyanov26d614d2013-06-29 21:45:29 +04001621 req->ff = fuse_write_file_get(fc, fi);
Miklos Szeredi72523422013-10-01 16:44:52 +02001622 if (!req->ff)
Maxim Patlasov27f1b362014-07-10 15:32:43 +04001623 goto err_nofile;
Miklos Szeredi72523422013-10-01 16:44:52 +02001624
Pavel Emelyanovadcadfa2013-06-29 21:42:20 +04001625 fuse_write_fill(req, req->ff, page_offset(page), 0);
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001626
1627 copy_highpage(tmp_page, page);
Miklos Szeredi2d698b02009-04-28 16:56:36 +02001628 req->misc.write.in.write_flags |= FUSE_WRITE_CACHE;
Miklos Szeredi8b284dc2013-10-01 16:44:53 +02001629 req->misc.write.next = NULL;
Miklos Szeredif4975c62009-04-02 14:25:34 +02001630 req->in.argpages = 1;
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001631 req->num_pages = 1;
1632 req->pages[0] = tmp_page;
Maxim Patlasovb2430d72012-10-26 19:49:24 +04001633 req->page_descs[0].offset = 0;
Maxim Patlasov85f40ae2012-10-26 19:49:33 +04001634 req->page_descs[0].length = PAGE_SIZE;
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001635 req->end = fuse_writepage_end;
1636 req->inode = inode;
1637
Tejun Heo93f78d82015-05-22 17:13:27 -04001638 inc_wb_stat(&inode_to_bdi(inode)->wb, WB_WRITEBACK);
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001639 inc_zone_page_state(tmp_page, NR_WRITEBACK_TEMP);
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001640
1641 spin_lock(&fc->lock);
1642 list_add(&req->writepages_entry, &fi->writepages);
1643 list_add_tail(&req->list, &fi->queued_writes);
1644 fuse_flush_writepages(inode);
1645 spin_unlock(&fc->lock);
1646
Maxim Patlasov4a4ac4e2013-08-12 20:39:30 +04001647 end_page_writeback(page);
1648
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001649 return 0;
1650
Maxim Patlasov27f1b362014-07-10 15:32:43 +04001651err_nofile:
1652 __free_page(tmp_page);
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001653err_free:
1654 fuse_request_free(req);
1655err:
1656 end_page_writeback(page);
Miklos Szeredi72523422013-10-01 16:44:52 +02001657 return error;
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001658}
1659
1660static int fuse_writepage(struct page *page, struct writeback_control *wbc)
1661{
1662 int err;
1663
Miklos Szerediff17be02013-10-01 16:44:53 +02001664 if (fuse_page_is_writeback(page->mapping->host, page->index)) {
1665 /*
1666 * ->writepages() should be called for sync() and friends. We
1667 * should only get here on direct reclaim and then we are
1668 * allowed to skip a page which is already in flight
1669 */
1670 WARN_ON(wbc->sync_mode == WB_SYNC_ALL);
1671
1672 redirty_page_for_writepage(wbc, page);
1673 return 0;
1674 }
1675
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001676 err = fuse_writepage_locked(page);
1677 unlock_page(page);
1678
1679 return err;
1680}
1681
Pavel Emelyanov26d614d2013-06-29 21:45:29 +04001682struct fuse_fill_wb_data {
1683 struct fuse_req *req;
1684 struct fuse_file *ff;
1685 struct inode *inode;
Maxim Patlasov2d033ea2013-08-16 15:51:41 +04001686 struct page **orig_pages;
Pavel Emelyanov26d614d2013-06-29 21:45:29 +04001687};
1688
1689static void fuse_writepages_send(struct fuse_fill_wb_data *data)
1690{
1691 struct fuse_req *req = data->req;
1692 struct inode *inode = data->inode;
1693 struct fuse_conn *fc = get_fuse_conn(inode);
1694 struct fuse_inode *fi = get_fuse_inode(inode);
Maxim Patlasov2d033ea2013-08-16 15:51:41 +04001695 int num_pages = req->num_pages;
1696 int i;
Pavel Emelyanov26d614d2013-06-29 21:45:29 +04001697
1698 req->ff = fuse_file_get(data->ff);
1699 spin_lock(&fc->lock);
1700 list_add_tail(&req->list, &fi->queued_writes);
1701 fuse_flush_writepages(inode);
1702 spin_unlock(&fc->lock);
Maxim Patlasov2d033ea2013-08-16 15:51:41 +04001703
1704 for (i = 0; i < num_pages; i++)
1705 end_page_writeback(data->orig_pages[i]);
Pavel Emelyanov26d614d2013-06-29 21:45:29 +04001706}
1707
Miklos Szeredi8b284dc2013-10-01 16:44:53 +02001708static bool fuse_writepage_in_flight(struct fuse_req *new_req,
1709 struct page *page)
1710{
1711 struct fuse_conn *fc = get_fuse_conn(new_req->inode);
1712 struct fuse_inode *fi = get_fuse_inode(new_req->inode);
1713 struct fuse_req *tmp;
1714 struct fuse_req *old_req;
1715 bool found = false;
1716 pgoff_t curr_index;
1717
1718 BUG_ON(new_req->num_pages != 0);
1719
1720 spin_lock(&fc->lock);
1721 list_del(&new_req->writepages_entry);
Miklos Szeredi8b284dc2013-10-01 16:44:53 +02001722 list_for_each_entry(old_req, &fi->writepages, writepages_entry) {
1723 BUG_ON(old_req->inode != new_req->inode);
1724 curr_index = old_req->misc.write.in.offset >> PAGE_CACHE_SHIFT;
1725 if (curr_index <= page->index &&
1726 page->index < curr_index + old_req->num_pages) {
1727 found = true;
1728 break;
1729 }
1730 }
Maxim Patlasovf6011082013-10-02 15:01:07 +04001731 if (!found) {
1732 list_add(&new_req->writepages_entry, &fi->writepages);
Miklos Szeredi8b284dc2013-10-01 16:44:53 +02001733 goto out_unlock;
Maxim Patlasovf6011082013-10-02 15:01:07 +04001734 }
Miklos Szeredi8b284dc2013-10-01 16:44:53 +02001735
Maxim Patlasovf6011082013-10-02 15:01:07 +04001736 new_req->num_pages = 1;
Miklos Szeredi8b284dc2013-10-01 16:44:53 +02001737 for (tmp = old_req; tmp != NULL; tmp = tmp->misc.write.next) {
1738 BUG_ON(tmp->inode != new_req->inode);
1739 curr_index = tmp->misc.write.in.offset >> PAGE_CACHE_SHIFT;
1740 if (tmp->num_pages == 1 &&
1741 curr_index == page->index) {
1742 old_req = tmp;
1743 }
1744 }
1745
Miklos Szeredi33e14b42015-07-01 16:26:01 +02001746 if (old_req->num_pages == 1 && test_bit(FR_PENDING, &old_req->flags)) {
Christoph Hellwigde1414a2015-01-14 10:42:36 +01001747 struct backing_dev_info *bdi = inode_to_bdi(page->mapping->host);
Maxim Patlasov41b6e412013-10-02 21:38:43 +04001748
Miklos Szeredi8b284dc2013-10-01 16:44:53 +02001749 copy_highpage(old_req->pages[0], page);
1750 spin_unlock(&fc->lock);
1751
Tejun Heo93f78d82015-05-22 17:13:27 -04001752 dec_wb_stat(&bdi->wb, WB_WRITEBACK);
Miklos Szeredi8b284dc2013-10-01 16:44:53 +02001753 dec_zone_page_state(page, NR_WRITEBACK_TEMP);
Tejun Heo93f78d82015-05-22 17:13:27 -04001754 wb_writeout_inc(&bdi->wb);
Miklos Szeredi8b284dc2013-10-01 16:44:53 +02001755 fuse_writepage_free(fc, new_req);
1756 fuse_request_free(new_req);
1757 goto out;
1758 } else {
1759 new_req->misc.write.next = old_req->misc.write.next;
1760 old_req->misc.write.next = new_req;
1761 }
1762out_unlock:
1763 spin_unlock(&fc->lock);
1764out:
1765 return found;
1766}
1767
Pavel Emelyanov26d614d2013-06-29 21:45:29 +04001768static int fuse_writepages_fill(struct page *page,
1769 struct writeback_control *wbc, void *_data)
1770{
1771 struct fuse_fill_wb_data *data = _data;
1772 struct fuse_req *req = data->req;
1773 struct inode *inode = data->inode;
1774 struct fuse_conn *fc = get_fuse_conn(inode);
1775 struct page *tmp_page;
Miklos Szeredi8b284dc2013-10-01 16:44:53 +02001776 bool is_writeback;
Pavel Emelyanov26d614d2013-06-29 21:45:29 +04001777 int err;
1778
1779 if (!data->ff) {
1780 err = -EIO;
1781 data->ff = fuse_write_file_get(fc, get_fuse_inode(inode));
1782 if (!data->ff)
1783 goto out_unlock;
1784 }
1785
Miklos Szeredi8b284dc2013-10-01 16:44:53 +02001786 /*
1787 * Being under writeback is unlikely but possible. For example direct
1788 * read to an mmaped fuse file will set the page dirty twice; once when
1789 * the pages are faulted with get_user_pages(), and then after the read
1790 * completed.
1791 */
1792 is_writeback = fuse_page_is_writeback(inode, page->index);
Pavel Emelyanov26d614d2013-06-29 21:45:29 +04001793
Miklos Szeredi8b284dc2013-10-01 16:44:53 +02001794 if (req && req->num_pages &&
1795 (is_writeback || req->num_pages == FUSE_MAX_PAGES_PER_REQ ||
1796 (req->num_pages + 1) * PAGE_CACHE_SIZE > fc->max_write ||
1797 data->orig_pages[req->num_pages - 1]->index + 1 != page->index)) {
1798 fuse_writepages_send(data);
1799 data->req = NULL;
Pavel Emelyanov26d614d2013-06-29 21:45:29 +04001800 }
1801 err = -ENOMEM;
1802 tmp_page = alloc_page(GFP_NOFS | __GFP_HIGHMEM);
1803 if (!tmp_page)
1804 goto out_unlock;
1805
1806 /*
1807 * The page must not be redirtied until the writeout is completed
1808 * (i.e. userspace has sent a reply to the write request). Otherwise
1809 * there could be more than one temporary page instance for each real
1810 * page.
1811 *
1812 * This is ensured by holding the page lock in page_mkwrite() while
1813 * checking fuse_page_is_writeback(). We already hold the page lock
1814 * since clear_page_dirty_for_io() and keep it held until we add the
1815 * request to the fi->writepages list and increment req->num_pages.
1816 * After this fuse_page_is_writeback() will indicate that the page is
1817 * under writeback, so we can release the page lock.
1818 */
1819 if (data->req == NULL) {
1820 struct fuse_inode *fi = get_fuse_inode(inode);
1821
1822 err = -ENOMEM;
1823 req = fuse_request_alloc_nofs(FUSE_MAX_PAGES_PER_REQ);
1824 if (!req) {
1825 __free_page(tmp_page);
1826 goto out_unlock;
1827 }
1828
1829 fuse_write_fill(req, data->ff, page_offset(page), 0);
1830 req->misc.write.in.write_flags |= FUSE_WRITE_CACHE;
Miklos Szeredi8b284dc2013-10-01 16:44:53 +02001831 req->misc.write.next = NULL;
Pavel Emelyanov26d614d2013-06-29 21:45:29 +04001832 req->in.argpages = 1;
Miklos Szeredi825d6d32015-07-01 16:25:58 +02001833 __set_bit(FR_BACKGROUND, &req->flags);
Pavel Emelyanov26d614d2013-06-29 21:45:29 +04001834 req->num_pages = 0;
1835 req->end = fuse_writepage_end;
1836 req->inode = inode;
1837
1838 spin_lock(&fc->lock);
1839 list_add(&req->writepages_entry, &fi->writepages);
1840 spin_unlock(&fc->lock);
1841
1842 data->req = req;
1843 }
1844 set_page_writeback(page);
1845
1846 copy_highpage(tmp_page, page);
1847 req->pages[req->num_pages] = tmp_page;
1848 req->page_descs[req->num_pages].offset = 0;
1849 req->page_descs[req->num_pages].length = PAGE_SIZE;
1850
Tejun Heo93f78d82015-05-22 17:13:27 -04001851 inc_wb_stat(&inode_to_bdi(inode)->wb, WB_WRITEBACK);
Pavel Emelyanov26d614d2013-06-29 21:45:29 +04001852 inc_zone_page_state(tmp_page, NR_WRITEBACK_TEMP);
Miklos Szeredi8b284dc2013-10-01 16:44:53 +02001853
1854 err = 0;
1855 if (is_writeback && fuse_writepage_in_flight(req, page)) {
1856 end_page_writeback(page);
1857 data->req = NULL;
1858 goto out_unlock;
1859 }
Maxim Patlasov2d033ea2013-08-16 15:51:41 +04001860 data->orig_pages[req->num_pages] = page;
Pavel Emelyanov26d614d2013-06-29 21:45:29 +04001861
1862 /*
1863 * Protected by fc->lock against concurrent access by
1864 * fuse_page_is_writeback().
1865 */
1866 spin_lock(&fc->lock);
1867 req->num_pages++;
1868 spin_unlock(&fc->lock);
1869
Pavel Emelyanov26d614d2013-06-29 21:45:29 +04001870out_unlock:
1871 unlock_page(page);
1872
1873 return err;
1874}
1875
1876static int fuse_writepages(struct address_space *mapping,
1877 struct writeback_control *wbc)
1878{
1879 struct inode *inode = mapping->host;
1880 struct fuse_fill_wb_data data;
1881 int err;
1882
1883 err = -EIO;
1884 if (is_bad_inode(inode))
1885 goto out;
1886
1887 data.inode = inode;
1888 data.req = NULL;
1889 data.ff = NULL;
1890
Maxim Patlasov2d033ea2013-08-16 15:51:41 +04001891 err = -ENOMEM;
Fabian Frederickf2b34552014-06-23 18:35:15 +02001892 data.orig_pages = kcalloc(FUSE_MAX_PAGES_PER_REQ,
1893 sizeof(struct page *),
Maxim Patlasov2d033ea2013-08-16 15:51:41 +04001894 GFP_NOFS);
1895 if (!data.orig_pages)
1896 goto out;
1897
Pavel Emelyanov26d614d2013-06-29 21:45:29 +04001898 err = write_cache_pages(mapping, wbc, fuse_writepages_fill, &data);
1899 if (data.req) {
1900 /* Ignore errors if we can write at least one page */
1901 BUG_ON(!data.req->num_pages);
1902 fuse_writepages_send(&data);
1903 err = 0;
1904 }
1905 if (data.ff)
1906 fuse_file_put(data.ff, false);
Maxim Patlasov2d033ea2013-08-16 15:51:41 +04001907
1908 kfree(data.orig_pages);
Pavel Emelyanov26d614d2013-06-29 21:45:29 +04001909out:
1910 return err;
1911}
1912
Pavel Emelyanov6b12c1b2013-10-10 17:11:43 +04001913/*
1914 * It's worthy to make sure that space is reserved on disk for the write,
1915 * but how to implement it without killing performance need more thinking.
1916 */
1917static int fuse_write_begin(struct file *file, struct address_space *mapping,
1918 loff_t pos, unsigned len, unsigned flags,
1919 struct page **pagep, void **fsdata)
1920{
1921 pgoff_t index = pos >> PAGE_CACHE_SHIFT;
Al Viroa4555892014-10-21 20:11:25 -04001922 struct fuse_conn *fc = get_fuse_conn(file_inode(file));
Pavel Emelyanov6b12c1b2013-10-10 17:11:43 +04001923 struct page *page;
1924 loff_t fsize;
1925 int err = -ENOMEM;
1926
1927 WARN_ON(!fc->writeback_cache);
1928
1929 page = grab_cache_page_write_begin(mapping, index, flags);
1930 if (!page)
1931 goto error;
1932
1933 fuse_wait_on_page_writeback(mapping->host, page->index);
1934
1935 if (PageUptodate(page) || len == PAGE_CACHE_SIZE)
1936 goto success;
1937 /*
1938 * Check if the start this page comes after the end of file, in which
1939 * case the readpage can be optimized away.
1940 */
1941 fsize = i_size_read(mapping->host);
1942 if (fsize <= (pos & PAGE_CACHE_MASK)) {
1943 size_t off = pos & ~PAGE_CACHE_MASK;
1944 if (off)
1945 zero_user_segment(page, 0, off);
1946 goto success;
1947 }
1948 err = fuse_do_readpage(file, page);
1949 if (err)
1950 goto cleanup;
1951success:
1952 *pagep = page;
1953 return 0;
1954
1955cleanup:
1956 unlock_page(page);
1957 page_cache_release(page);
1958error:
1959 return err;
1960}
1961
1962static int fuse_write_end(struct file *file, struct address_space *mapping,
1963 loff_t pos, unsigned len, unsigned copied,
1964 struct page *page, void *fsdata)
1965{
1966 struct inode *inode = page->mapping->host;
1967
1968 if (!PageUptodate(page)) {
1969 /* Zero any unwritten bytes at the end of the page */
1970 size_t endoff = (pos + copied) & ~PAGE_CACHE_MASK;
1971 if (endoff)
1972 zero_user_segment(page, endoff, PAGE_CACHE_SIZE);
1973 SetPageUptodate(page);
1974 }
1975
1976 fuse_write_update_size(inode, pos + copied);
1977 set_page_dirty(page);
1978 unlock_page(page);
1979 page_cache_release(page);
1980
1981 return copied;
1982}
1983
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001984static int fuse_launder_page(struct page *page)
1985{
1986 int err = 0;
1987 if (clear_page_dirty_for_io(page)) {
1988 struct inode *inode = page->mapping->host;
1989 err = fuse_writepage_locked(page);
1990 if (!err)
1991 fuse_wait_on_page_writeback(inode, page->index);
1992 }
1993 return err;
1994}
1995
1996/*
1997 * Write back dirty pages now, because there may not be any suitable
1998 * open files later
1999 */
2000static void fuse_vma_close(struct vm_area_struct *vma)
2001{
2002 filemap_write_and_wait(vma->vm_file->f_mapping);
2003}
2004
2005/*
2006 * Wait for writeback against this page to complete before allowing it
2007 * to be marked dirty again, and hence written back again, possibly
2008 * before the previous writepage completed.
2009 *
2010 * Block here, instead of in ->writepage(), so that the userspace fs
2011 * can only block processes actually operating on the filesystem.
2012 *
2013 * Otherwise unprivileged userspace fs would be able to block
2014 * unrelated:
2015 *
2016 * - page migration
2017 * - sync(2)
2018 * - try_to_free_pages() with order > PAGE_ALLOC_COSTLY_ORDER
2019 */
Nick Pigginc2ec1752009-03-31 15:23:21 -07002020static int fuse_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
Miklos Szeredi3be5a522008-04-30 00:54:41 -07002021{
Nick Pigginc2ec1752009-03-31 15:23:21 -07002022 struct page *page = vmf->page;
Miklos Szeredicca24372013-10-01 16:44:51 +02002023 struct inode *inode = file_inode(vma->vm_file);
2024
2025 file_update_time(vma->vm_file);
2026 lock_page(page);
2027 if (page->mapping != inode->i_mapping) {
2028 unlock_page(page);
2029 return VM_FAULT_NOPAGE;
2030 }
Miklos Szeredi3be5a522008-04-30 00:54:41 -07002031
2032 fuse_wait_on_page_writeback(inode, page->index);
Miklos Szeredicca24372013-10-01 16:44:51 +02002033 return VM_FAULT_LOCKED;
Miklos Szeredi3be5a522008-04-30 00:54:41 -07002034}
2035
Alexey Dobriyanf0f37e22009-09-27 22:29:37 +04002036static const struct vm_operations_struct fuse_file_vm_ops = {
Miklos Szeredi3be5a522008-04-30 00:54:41 -07002037 .close = fuse_vma_close,
2038 .fault = filemap_fault,
Kirill A. Shutemovf1820362014-04-07 15:37:19 -07002039 .map_pages = filemap_map_pages,
Miklos Szeredi3be5a522008-04-30 00:54:41 -07002040 .page_mkwrite = fuse_page_mkwrite,
2041};
2042
2043static int fuse_file_mmap(struct file *file, struct vm_area_struct *vma)
2044{
Pavel Emelyanov650b22b2013-10-10 17:10:04 +04002045 if ((vma->vm_flags & VM_SHARED) && (vma->vm_flags & VM_MAYWRITE))
2046 fuse_link_write_file(file);
2047
Miklos Szeredi3be5a522008-04-30 00:54:41 -07002048 file_accessed(file);
2049 vma->vm_ops = &fuse_file_vm_ops;
Miklos Szeredib6aeade2005-09-09 13:10:30 -07002050 return 0;
2051}
2052
Miklos Szeredifc280c92009-04-02 14:25:35 +02002053static int fuse_direct_mmap(struct file *file, struct vm_area_struct *vma)
2054{
2055 /* Can't provide the coherency needed for MAP_SHARED */
2056 if (vma->vm_flags & VM_MAYSHARE)
2057 return -ENODEV;
2058
Miklos Szeredi3121bfe2009-04-09 17:37:53 +02002059 invalidate_inode_pages2(file->f_mapping);
2060
Miklos Szeredifc280c92009-04-02 14:25:35 +02002061 return generic_file_mmap(file, vma);
2062}
2063
Miklos Szeredi71421252006-06-25 05:48:52 -07002064static int convert_fuse_file_lock(const struct fuse_file_lock *ffl,
2065 struct file_lock *fl)
2066{
2067 switch (ffl->type) {
2068 case F_UNLCK:
2069 break;
2070
2071 case F_RDLCK:
2072 case F_WRLCK:
2073 if (ffl->start > OFFSET_MAX || ffl->end > OFFSET_MAX ||
2074 ffl->end < ffl->start)
2075 return -EIO;
2076
2077 fl->fl_start = ffl->start;
2078 fl->fl_end = ffl->end;
2079 fl->fl_pid = ffl->pid;
2080 break;
2081
2082 default:
2083 return -EIO;
2084 }
2085 fl->fl_type = ffl->type;
2086 return 0;
2087}
2088
Miklos Szeredi70781872014-12-12 09:49:05 +01002089static void fuse_lk_fill(struct fuse_args *args, struct file *file,
Miklos Szeredia9ff4f82007-10-18 03:07:02 -07002090 const struct file_lock *fl, int opcode, pid_t pid,
Miklos Szeredi70781872014-12-12 09:49:05 +01002091 int flock, struct fuse_lk_in *inarg)
Miklos Szeredi71421252006-06-25 05:48:52 -07002092{
Al Viro6131ffa2013-02-27 16:59:05 -05002093 struct inode *inode = file_inode(file);
Miklos Szeredi9c8ef562006-06-25 05:48:55 -07002094 struct fuse_conn *fc = get_fuse_conn(inode);
Miklos Szeredi71421252006-06-25 05:48:52 -07002095 struct fuse_file *ff = file->private_data;
Miklos Szeredi71421252006-06-25 05:48:52 -07002096
Miklos Szeredi70781872014-12-12 09:49:05 +01002097 memset(inarg, 0, sizeof(*inarg));
2098 inarg->fh = ff->fh;
2099 inarg->owner = fuse_lock_owner_id(fc, fl->fl_owner);
2100 inarg->lk.start = fl->fl_start;
2101 inarg->lk.end = fl->fl_end;
2102 inarg->lk.type = fl->fl_type;
2103 inarg->lk.pid = pid;
Miklos Szeredia9ff4f82007-10-18 03:07:02 -07002104 if (flock)
Miklos Szeredi70781872014-12-12 09:49:05 +01002105 inarg->lk_flags |= FUSE_LK_FLOCK;
2106 args->in.h.opcode = opcode;
2107 args->in.h.nodeid = get_node_id(inode);
2108 args->in.numargs = 1;
2109 args->in.args[0].size = sizeof(*inarg);
2110 args->in.args[0].value = inarg;
Miklos Szeredi71421252006-06-25 05:48:52 -07002111}
2112
2113static int fuse_getlk(struct file *file, struct file_lock *fl)
2114{
Al Viro6131ffa2013-02-27 16:59:05 -05002115 struct inode *inode = file_inode(file);
Miklos Szeredi71421252006-06-25 05:48:52 -07002116 struct fuse_conn *fc = get_fuse_conn(inode);
Miklos Szeredi70781872014-12-12 09:49:05 +01002117 FUSE_ARGS(args);
2118 struct fuse_lk_in inarg;
Miklos Szeredi71421252006-06-25 05:48:52 -07002119 struct fuse_lk_out outarg;
2120 int err;
2121
Miklos Szeredi70781872014-12-12 09:49:05 +01002122 fuse_lk_fill(&args, file, fl, FUSE_GETLK, 0, 0, &inarg);
2123 args.out.numargs = 1;
2124 args.out.args[0].size = sizeof(outarg);
2125 args.out.args[0].value = &outarg;
2126 err = fuse_simple_request(fc, &args);
Miklos Szeredi71421252006-06-25 05:48:52 -07002127 if (!err)
2128 err = convert_fuse_file_lock(&outarg.lk, fl);
2129
2130 return err;
2131}
2132
Miklos Szeredia9ff4f82007-10-18 03:07:02 -07002133static int fuse_setlk(struct file *file, struct file_lock *fl, int flock)
Miklos Szeredi71421252006-06-25 05:48:52 -07002134{
Al Viro6131ffa2013-02-27 16:59:05 -05002135 struct inode *inode = file_inode(file);
Miklos Szeredi71421252006-06-25 05:48:52 -07002136 struct fuse_conn *fc = get_fuse_conn(inode);
Miklos Szeredi70781872014-12-12 09:49:05 +01002137 FUSE_ARGS(args);
2138 struct fuse_lk_in inarg;
Miklos Szeredi71421252006-06-25 05:48:52 -07002139 int opcode = (fl->fl_flags & FL_SLEEP) ? FUSE_SETLKW : FUSE_SETLK;
2140 pid_t pid = fl->fl_type != F_UNLCK ? current->tgid : 0;
2141 int err;
2142
J. Bruce Fields8fb47a42011-07-20 20:21:59 -04002143 if (fl->fl_lmops && fl->fl_lmops->lm_grant) {
Miklos Szeredi48e90762008-07-25 01:49:02 -07002144 /* NLM needs asynchronous locks, which we don't support yet */
2145 return -ENOLCK;
2146 }
2147
Miklos Szeredi71421252006-06-25 05:48:52 -07002148 /* Unlock on close is handled by the flush method */
2149 if (fl->fl_flags & FL_CLOSE)
2150 return 0;
2151
Miklos Szeredi70781872014-12-12 09:49:05 +01002152 fuse_lk_fill(&args, file, fl, opcode, pid, flock, &inarg);
2153 err = fuse_simple_request(fc, &args);
Miklos Szeredi71421252006-06-25 05:48:52 -07002154
Miklos Szeredia4d27e72006-06-25 05:48:54 -07002155 /* locking is restartable */
2156 if (err == -EINTR)
2157 err = -ERESTARTSYS;
Miklos Szeredi70781872014-12-12 09:49:05 +01002158
Miklos Szeredi71421252006-06-25 05:48:52 -07002159 return err;
2160}
2161
2162static int fuse_file_lock(struct file *file, int cmd, struct file_lock *fl)
2163{
Al Viro6131ffa2013-02-27 16:59:05 -05002164 struct inode *inode = file_inode(file);
Miklos Szeredi71421252006-06-25 05:48:52 -07002165 struct fuse_conn *fc = get_fuse_conn(inode);
2166 int err;
2167
Miklos Szeredi48e90762008-07-25 01:49:02 -07002168 if (cmd == F_CANCELLK) {
2169 err = 0;
2170 } else if (cmd == F_GETLK) {
Miklos Szeredi71421252006-06-25 05:48:52 -07002171 if (fc->no_lock) {
Marc Eshel9d6a8c52007-02-21 00:55:18 -05002172 posix_test_lock(file, fl);
Miklos Szeredi71421252006-06-25 05:48:52 -07002173 err = 0;
2174 } else
2175 err = fuse_getlk(file, fl);
2176 } else {
2177 if (fc->no_lock)
Miklos Szeredi48e90762008-07-25 01:49:02 -07002178 err = posix_lock_file(file, fl, NULL);
Miklos Szeredi71421252006-06-25 05:48:52 -07002179 else
Miklos Szeredia9ff4f82007-10-18 03:07:02 -07002180 err = fuse_setlk(file, fl, 0);
Miklos Szeredi71421252006-06-25 05:48:52 -07002181 }
2182 return err;
2183}
2184
Miklos Szeredia9ff4f82007-10-18 03:07:02 -07002185static int fuse_file_flock(struct file *file, int cmd, struct file_lock *fl)
2186{
Al Viro6131ffa2013-02-27 16:59:05 -05002187 struct inode *inode = file_inode(file);
Miklos Szeredia9ff4f82007-10-18 03:07:02 -07002188 struct fuse_conn *fc = get_fuse_conn(inode);
2189 int err;
2190
Miklos Szeredi37fb3a32011-08-08 16:08:08 +02002191 if (fc->no_flock) {
Miklos Szeredia9ff4f82007-10-18 03:07:02 -07002192 err = flock_lock_file_wait(file, fl);
2193 } else {
Miklos Szeredi37fb3a32011-08-08 16:08:08 +02002194 struct fuse_file *ff = file->private_data;
2195
Miklos Szeredia9ff4f82007-10-18 03:07:02 -07002196 /* emulate flock with POSIX locks */
Miklos Szeredi37fb3a32011-08-08 16:08:08 +02002197 ff->flock = true;
Miklos Szeredia9ff4f82007-10-18 03:07:02 -07002198 err = fuse_setlk(file, fl, 1);
2199 }
2200
2201 return err;
2202}
2203
Miklos Szeredib2d22722006-12-06 20:35:51 -08002204static sector_t fuse_bmap(struct address_space *mapping, sector_t block)
2205{
2206 struct inode *inode = mapping->host;
2207 struct fuse_conn *fc = get_fuse_conn(inode);
Miklos Szeredi70781872014-12-12 09:49:05 +01002208 FUSE_ARGS(args);
Miklos Szeredib2d22722006-12-06 20:35:51 -08002209 struct fuse_bmap_in inarg;
2210 struct fuse_bmap_out outarg;
2211 int err;
2212
2213 if (!inode->i_sb->s_bdev || fc->no_bmap)
2214 return 0;
2215
Miklos Szeredib2d22722006-12-06 20:35:51 -08002216 memset(&inarg, 0, sizeof(inarg));
2217 inarg.block = block;
2218 inarg.blocksize = inode->i_sb->s_blocksize;
Miklos Szeredi70781872014-12-12 09:49:05 +01002219 args.in.h.opcode = FUSE_BMAP;
2220 args.in.h.nodeid = get_node_id(inode);
2221 args.in.numargs = 1;
2222 args.in.args[0].size = sizeof(inarg);
2223 args.in.args[0].value = &inarg;
2224 args.out.numargs = 1;
2225 args.out.args[0].size = sizeof(outarg);
2226 args.out.args[0].value = &outarg;
2227 err = fuse_simple_request(fc, &args);
Miklos Szeredib2d22722006-12-06 20:35:51 -08002228 if (err == -ENOSYS)
2229 fc->no_bmap = 1;
2230
2231 return err ? 0 : outarg.block;
2232}
2233
Andrew Morton965c8e52012-12-17 15:59:39 -08002234static loff_t fuse_file_llseek(struct file *file, loff_t offset, int whence)
Miklos Szeredi5559b8f2008-04-30 00:54:45 -07002235{
2236 loff_t retval;
Al Viro6131ffa2013-02-27 16:59:05 -05002237 struct inode *inode = file_inode(file);
Miklos Szeredi5559b8f2008-04-30 00:54:45 -07002238
Miklos Szeredic07c3d12011-12-13 11:58:48 +01002239 /* No i_mutex protection necessary for SEEK_CUR and SEEK_SET */
Andrew Morton965c8e52012-12-17 15:59:39 -08002240 if (whence == SEEK_CUR || whence == SEEK_SET)
2241 return generic_file_llseek(file, offset, whence);
Josef Bacik06222e42011-07-18 13:21:38 -04002242
Miklos Szeredic07c3d12011-12-13 11:58:48 +01002243 mutex_lock(&inode->i_mutex);
2244 retval = fuse_update_attributes(inode, NULL, file, NULL);
2245 if (!retval)
Andrew Morton965c8e52012-12-17 15:59:39 -08002246 retval = generic_file_llseek(file, offset, whence);
Miklos Szeredi5559b8f2008-04-30 00:54:45 -07002247 mutex_unlock(&inode->i_mutex);
Miklos Szeredic07c3d12011-12-13 11:58:48 +01002248
Miklos Szeredi5559b8f2008-04-30 00:54:45 -07002249 return retval;
2250}
2251
Tejun Heo59efec72008-11-26 12:03:55 +01002252static int fuse_ioctl_copy_user(struct page **pages, struct iovec *iov,
2253 unsigned int nr_segs, size_t bytes, bool to_user)
2254{
2255 struct iov_iter ii;
2256 int page_idx = 0;
2257
2258 if (!bytes)
2259 return 0;
2260
Al Viro71d8e532014-03-05 19:28:09 -05002261 iov_iter_init(&ii, to_user ? READ : WRITE, iov, nr_segs, bytes);
Tejun Heo59efec72008-11-26 12:03:55 +01002262
2263 while (iov_iter_count(&ii)) {
2264 struct page *page = pages[page_idx++];
2265 size_t todo = min_t(size_t, PAGE_SIZE, iov_iter_count(&ii));
Dan Carpenter4aa0edd2010-05-07 10:28:17 +02002266 void *kaddr;
Tejun Heo59efec72008-11-26 12:03:55 +01002267
Dan Carpenter4aa0edd2010-05-07 10:28:17 +02002268 kaddr = kmap(page);
Tejun Heo59efec72008-11-26 12:03:55 +01002269
2270 while (todo) {
2271 char __user *uaddr = ii.iov->iov_base + ii.iov_offset;
2272 size_t iov_len = ii.iov->iov_len - ii.iov_offset;
2273 size_t copy = min(todo, iov_len);
2274 size_t left;
2275
2276 if (!to_user)
2277 left = copy_from_user(kaddr, uaddr, copy);
2278 else
2279 left = copy_to_user(uaddr, kaddr, copy);
2280
2281 if (unlikely(left))
2282 return -EFAULT;
2283
2284 iov_iter_advance(&ii, copy);
2285 todo -= copy;
2286 kaddr += copy;
2287 }
2288
Jens Axboe0bd87182009-11-03 11:40:44 +01002289 kunmap(page);
Tejun Heo59efec72008-11-26 12:03:55 +01002290 }
2291
2292 return 0;
2293}
2294
2295/*
Miklos Szeredid9d318d2010-11-30 16:39:27 +01002296 * CUSE servers compiled on 32bit broke on 64bit kernels because the
2297 * ABI was defined to be 'struct iovec' which is different on 32bit
2298 * and 64bit. Fortunately we can determine which structure the server
2299 * used from the size of the reply.
2300 */
Miklos Szeredi1baa26b2010-12-07 20:16:56 +01002301static int fuse_copy_ioctl_iovec_old(struct iovec *dst, void *src,
2302 size_t transferred, unsigned count,
2303 bool is_compat)
Miklos Szeredid9d318d2010-11-30 16:39:27 +01002304{
2305#ifdef CONFIG_COMPAT
2306 if (count * sizeof(struct compat_iovec) == transferred) {
2307 struct compat_iovec *ciov = src;
2308 unsigned i;
2309
2310 /*
2311 * With this interface a 32bit server cannot support
2312 * non-compat (i.e. ones coming from 64bit apps) ioctl
2313 * requests
2314 */
2315 if (!is_compat)
2316 return -EINVAL;
2317
2318 for (i = 0; i < count; i++) {
2319 dst[i].iov_base = compat_ptr(ciov[i].iov_base);
2320 dst[i].iov_len = ciov[i].iov_len;
2321 }
2322 return 0;
2323 }
2324#endif
2325
2326 if (count * sizeof(struct iovec) != transferred)
2327 return -EIO;
2328
2329 memcpy(dst, src, transferred);
2330 return 0;
2331}
2332
Miklos Szeredi75727772010-11-30 16:39:27 +01002333/* Make sure iov_length() won't overflow */
2334static int fuse_verify_ioctl_iov(struct iovec *iov, size_t count)
2335{
2336 size_t n;
2337 u32 max = FUSE_MAX_PAGES_PER_REQ << PAGE_SHIFT;
2338
Zach Brownfb6ccff2012-07-24 12:10:11 -07002339 for (n = 0; n < count; n++, iov++) {
Miklos Szeredi75727772010-11-30 16:39:27 +01002340 if (iov->iov_len > (size_t) max)
2341 return -ENOMEM;
2342 max -= iov->iov_len;
2343 }
2344 return 0;
2345}
2346
Miklos Szeredi1baa26b2010-12-07 20:16:56 +01002347static int fuse_copy_ioctl_iovec(struct fuse_conn *fc, struct iovec *dst,
2348 void *src, size_t transferred, unsigned count,
2349 bool is_compat)
2350{
2351 unsigned i;
2352 struct fuse_ioctl_iovec *fiov = src;
2353
2354 if (fc->minor < 16) {
2355 return fuse_copy_ioctl_iovec_old(dst, src, transferred,
2356 count, is_compat);
2357 }
2358
2359 if (count * sizeof(struct fuse_ioctl_iovec) != transferred)
2360 return -EIO;
2361
2362 for (i = 0; i < count; i++) {
2363 /* Did the server supply an inappropriate value? */
2364 if (fiov[i].base != (unsigned long) fiov[i].base ||
2365 fiov[i].len != (unsigned long) fiov[i].len)
2366 return -EIO;
2367
2368 dst[i].iov_base = (void __user *) (unsigned long) fiov[i].base;
2369 dst[i].iov_len = (size_t) fiov[i].len;
2370
2371#ifdef CONFIG_COMPAT
2372 if (is_compat &&
2373 (ptr_to_compat(dst[i].iov_base) != fiov[i].base ||
2374 (compat_size_t) dst[i].iov_len != fiov[i].len))
2375 return -EIO;
2376#endif
2377 }
2378
2379 return 0;
2380}
2381
2382
Miklos Szeredid9d318d2010-11-30 16:39:27 +01002383/*
Tejun Heo59efec72008-11-26 12:03:55 +01002384 * For ioctls, there is no generic way to determine how much memory
2385 * needs to be read and/or written. Furthermore, ioctls are allowed
2386 * to dereference the passed pointer, so the parameter requires deep
2387 * copying but FUSE has no idea whatsoever about what to copy in or
2388 * out.
2389 *
2390 * This is solved by allowing FUSE server to retry ioctl with
2391 * necessary in/out iovecs. Let's assume the ioctl implementation
2392 * needs to read in the following structure.
2393 *
2394 * struct a {
2395 * char *buf;
2396 * size_t buflen;
2397 * }
2398 *
2399 * On the first callout to FUSE server, inarg->in_size and
2400 * inarg->out_size will be NULL; then, the server completes the ioctl
2401 * with FUSE_IOCTL_RETRY set in out->flags, out->in_iovs set to 1 and
2402 * the actual iov array to
2403 *
2404 * { { .iov_base = inarg.arg, .iov_len = sizeof(struct a) } }
2405 *
2406 * which tells FUSE to copy in the requested area and retry the ioctl.
2407 * On the second round, the server has access to the structure and
2408 * from that it can tell what to look for next, so on the invocation,
2409 * it sets FUSE_IOCTL_RETRY, out->in_iovs to 2 and iov array to
2410 *
2411 * { { .iov_base = inarg.arg, .iov_len = sizeof(struct a) },
2412 * { .iov_base = a.buf, .iov_len = a.buflen } }
2413 *
2414 * FUSE will copy both struct a and the pointed buffer from the
2415 * process doing the ioctl and retry ioctl with both struct a and the
2416 * buffer.
2417 *
2418 * This time, FUSE server has everything it needs and completes ioctl
2419 * without FUSE_IOCTL_RETRY which finishes the ioctl call.
2420 *
2421 * Copying data out works the same way.
2422 *
2423 * Note that if FUSE_IOCTL_UNRESTRICTED is clear, the kernel
2424 * automatically initializes in and out iovs by decoding @cmd with
2425 * _IOC_* macros and the server is not allowed to request RETRY. This
2426 * limits ioctl data transfers to well-formed ioctls and is the forced
2427 * behavior for all FUSE servers.
2428 */
Tejun Heo08cbf542009-04-14 10:54:53 +09002429long fuse_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg,
2430 unsigned int flags)
Tejun Heo59efec72008-11-26 12:03:55 +01002431{
Tejun Heo59efec72008-11-26 12:03:55 +01002432 struct fuse_file *ff = file->private_data;
Miklos Szeredid36f2482009-04-28 16:56:39 +02002433 struct fuse_conn *fc = ff->fc;
Tejun Heo59efec72008-11-26 12:03:55 +01002434 struct fuse_ioctl_in inarg = {
2435 .fh = ff->fh,
2436 .cmd = cmd,
2437 .arg = arg,
2438 .flags = flags
2439 };
2440 struct fuse_ioctl_out outarg;
2441 struct fuse_req *req = NULL;
2442 struct page **pages = NULL;
Miklos Szeredi8ac83502010-12-07 20:16:56 +01002443 struct iovec *iov_page = NULL;
Tejun Heo59efec72008-11-26 12:03:55 +01002444 struct iovec *in_iov = NULL, *out_iov = NULL;
2445 unsigned int in_iovs = 0, out_iovs = 0, num_pages = 0, max_pages;
2446 size_t in_size, out_size, transferred;
2447 int err;
2448
Miklos Szeredi1baa26b2010-12-07 20:16:56 +01002449#if BITS_PER_LONG == 32
2450 inarg.flags |= FUSE_IOCTL_32BIT;
2451#else
2452 if (flags & FUSE_IOCTL_COMPAT)
2453 inarg.flags |= FUSE_IOCTL_32BIT;
2454#endif
2455
Tejun Heo59efec72008-11-26 12:03:55 +01002456 /* assume all the iovs returned by client always fits in a page */
Miklos Szeredi1baa26b2010-12-07 20:16:56 +01002457 BUILD_BUG_ON(sizeof(struct fuse_ioctl_iovec) * FUSE_IOCTL_MAX_IOV > PAGE_SIZE);
Tejun Heo59efec72008-11-26 12:03:55 +01002458
Tejun Heo59efec72008-11-26 12:03:55 +01002459 err = -ENOMEM;
Thomas Meyerc411cc82011-11-29 22:08:00 +01002460 pages = kcalloc(FUSE_MAX_PAGES_PER_REQ, sizeof(pages[0]), GFP_KERNEL);
Miklos Szeredi8ac83502010-12-07 20:16:56 +01002461 iov_page = (struct iovec *) __get_free_page(GFP_KERNEL);
Tejun Heo59efec72008-11-26 12:03:55 +01002462 if (!pages || !iov_page)
2463 goto out;
2464
2465 /*
2466 * If restricted, initialize IO parameters as encoded in @cmd.
2467 * RETRY from server is not allowed.
2468 */
2469 if (!(flags & FUSE_IOCTL_UNRESTRICTED)) {
Miklos Szeredi8ac83502010-12-07 20:16:56 +01002470 struct iovec *iov = iov_page;
Tejun Heo59efec72008-11-26 12:03:55 +01002471
Miklos Szeredic9f0523d2008-12-02 14:49:42 +01002472 iov->iov_base = (void __user *)arg;
Tejun Heo59efec72008-11-26 12:03:55 +01002473 iov->iov_len = _IOC_SIZE(cmd);
2474
2475 if (_IOC_DIR(cmd) & _IOC_WRITE) {
2476 in_iov = iov;
2477 in_iovs = 1;
2478 }
2479
2480 if (_IOC_DIR(cmd) & _IOC_READ) {
2481 out_iov = iov;
2482 out_iovs = 1;
2483 }
2484 }
2485
2486 retry:
2487 inarg.in_size = in_size = iov_length(in_iov, in_iovs);
2488 inarg.out_size = out_size = iov_length(out_iov, out_iovs);
2489
2490 /*
2491 * Out data can be used either for actual out data or iovs,
2492 * make sure there always is at least one page.
2493 */
2494 out_size = max_t(size_t, out_size, PAGE_SIZE);
2495 max_pages = DIV_ROUND_UP(max(in_size, out_size), PAGE_SIZE);
2496
2497 /* make sure there are enough buffer pages and init request with them */
2498 err = -ENOMEM;
2499 if (max_pages > FUSE_MAX_PAGES_PER_REQ)
2500 goto out;
2501 while (num_pages < max_pages) {
2502 pages[num_pages] = alloc_page(GFP_KERNEL | __GFP_HIGHMEM);
2503 if (!pages[num_pages])
2504 goto out;
2505 num_pages++;
2506 }
2507
Maxim Patlasov54b96672012-10-26 19:49:13 +04002508 req = fuse_get_req(fc, num_pages);
Tejun Heo59efec72008-11-26 12:03:55 +01002509 if (IS_ERR(req)) {
2510 err = PTR_ERR(req);
2511 req = NULL;
2512 goto out;
2513 }
2514 memcpy(req->pages, pages, sizeof(req->pages[0]) * num_pages);
2515 req->num_pages = num_pages;
Maxim Patlasov7c190c82012-10-26 19:50:29 +04002516 fuse_page_descs_length_init(req, 0, req->num_pages);
Tejun Heo59efec72008-11-26 12:03:55 +01002517
2518 /* okay, let's send it to the client */
2519 req->in.h.opcode = FUSE_IOCTL;
Miklos Szeredid36f2482009-04-28 16:56:39 +02002520 req->in.h.nodeid = ff->nodeid;
Tejun Heo59efec72008-11-26 12:03:55 +01002521 req->in.numargs = 1;
2522 req->in.args[0].size = sizeof(inarg);
2523 req->in.args[0].value = &inarg;
2524 if (in_size) {
2525 req->in.numargs++;
2526 req->in.args[1].size = in_size;
2527 req->in.argpages = 1;
2528
2529 err = fuse_ioctl_copy_user(pages, in_iov, in_iovs, in_size,
2530 false);
2531 if (err)
2532 goto out;
2533 }
2534
2535 req->out.numargs = 2;
2536 req->out.args[0].size = sizeof(outarg);
2537 req->out.args[0].value = &outarg;
2538 req->out.args[1].size = out_size;
2539 req->out.argpages = 1;
2540 req->out.argvar = 1;
2541
Tejun Heob93f8582008-11-26 12:03:55 +01002542 fuse_request_send(fc, req);
Tejun Heo59efec72008-11-26 12:03:55 +01002543 err = req->out.h.error;
2544 transferred = req->out.args[1].size;
2545 fuse_put_request(fc, req);
2546 req = NULL;
2547 if (err)
2548 goto out;
2549
2550 /* did it ask for retry? */
2551 if (outarg.flags & FUSE_IOCTL_RETRY) {
Miklos Szeredi8ac83502010-12-07 20:16:56 +01002552 void *vaddr;
Tejun Heo59efec72008-11-26 12:03:55 +01002553
2554 /* no retry if in restricted mode */
2555 err = -EIO;
2556 if (!(flags & FUSE_IOCTL_UNRESTRICTED))
2557 goto out;
2558
2559 in_iovs = outarg.in_iovs;
2560 out_iovs = outarg.out_iovs;
2561
2562 /*
2563 * Make sure things are in boundary, separate checks
2564 * are to protect against overflow.
2565 */
2566 err = -ENOMEM;
2567 if (in_iovs > FUSE_IOCTL_MAX_IOV ||
2568 out_iovs > FUSE_IOCTL_MAX_IOV ||
2569 in_iovs + out_iovs > FUSE_IOCTL_MAX_IOV)
2570 goto out;
2571
Cong Wang2408f6e2011-11-25 23:14:30 +08002572 vaddr = kmap_atomic(pages[0]);
Miklos Szeredi1baa26b2010-12-07 20:16:56 +01002573 err = fuse_copy_ioctl_iovec(fc, iov_page, vaddr,
Miklos Szeredid9d318d2010-11-30 16:39:27 +01002574 transferred, in_iovs + out_iovs,
2575 (flags & FUSE_IOCTL_COMPAT) != 0);
Cong Wang2408f6e2011-11-25 23:14:30 +08002576 kunmap_atomic(vaddr);
Miklos Szeredid9d318d2010-11-30 16:39:27 +01002577 if (err)
2578 goto out;
Tejun Heo59efec72008-11-26 12:03:55 +01002579
Miklos Szeredi8ac83502010-12-07 20:16:56 +01002580 in_iov = iov_page;
Tejun Heo59efec72008-11-26 12:03:55 +01002581 out_iov = in_iov + in_iovs;
2582
Miklos Szeredi75727772010-11-30 16:39:27 +01002583 err = fuse_verify_ioctl_iov(in_iov, in_iovs);
2584 if (err)
2585 goto out;
2586
2587 err = fuse_verify_ioctl_iov(out_iov, out_iovs);
2588 if (err)
2589 goto out;
2590
Tejun Heo59efec72008-11-26 12:03:55 +01002591 goto retry;
2592 }
2593
2594 err = -EIO;
2595 if (transferred > inarg.out_size)
2596 goto out;
2597
2598 err = fuse_ioctl_copy_user(pages, out_iov, out_iovs, transferred, true);
2599 out:
2600 if (req)
2601 fuse_put_request(fc, req);
Miklos Szeredi8ac83502010-12-07 20:16:56 +01002602 free_page((unsigned long) iov_page);
Tejun Heo59efec72008-11-26 12:03:55 +01002603 while (num_pages)
2604 __free_page(pages[--num_pages]);
2605 kfree(pages);
2606
2607 return err ? err : outarg.result;
2608}
Tejun Heo08cbf542009-04-14 10:54:53 +09002609EXPORT_SYMBOL_GPL(fuse_do_ioctl);
Tejun Heo59efec72008-11-26 12:03:55 +01002610
Miklos Szeredib18da0c2011-12-13 11:58:49 +01002611long fuse_ioctl_common(struct file *file, unsigned int cmd,
2612 unsigned long arg, unsigned int flags)
Miklos Szeredid36f2482009-04-28 16:56:39 +02002613{
Al Viro6131ffa2013-02-27 16:59:05 -05002614 struct inode *inode = file_inode(file);
Miklos Szeredid36f2482009-04-28 16:56:39 +02002615 struct fuse_conn *fc = get_fuse_conn(inode);
2616
Anatol Pomozovc2132c12013-01-14 22:30:00 -08002617 if (!fuse_allow_current_process(fc))
Miklos Szeredid36f2482009-04-28 16:56:39 +02002618 return -EACCES;
2619
2620 if (is_bad_inode(inode))
2621 return -EIO;
2622
2623 return fuse_do_ioctl(file, cmd, arg, flags);
2624}
2625
Tejun Heo59efec72008-11-26 12:03:55 +01002626static long fuse_file_ioctl(struct file *file, unsigned int cmd,
2627 unsigned long arg)
2628{
Miklos Szeredib18da0c2011-12-13 11:58:49 +01002629 return fuse_ioctl_common(file, cmd, arg, 0);
Tejun Heo59efec72008-11-26 12:03:55 +01002630}
2631
2632static long fuse_file_compat_ioctl(struct file *file, unsigned int cmd,
2633 unsigned long arg)
2634{
Miklos Szeredib18da0c2011-12-13 11:58:49 +01002635 return fuse_ioctl_common(file, cmd, arg, FUSE_IOCTL_COMPAT);
Tejun Heo59efec72008-11-26 12:03:55 +01002636}
2637
Tejun Heo95668a62008-11-26 12:03:55 +01002638/*
2639 * All files which have been polled are linked to RB tree
2640 * fuse_conn->polled_files which is indexed by kh. Walk the tree and
2641 * find the matching one.
2642 */
2643static struct rb_node **fuse_find_polled_node(struct fuse_conn *fc, u64 kh,
2644 struct rb_node **parent_out)
2645{
2646 struct rb_node **link = &fc->polled_files.rb_node;
2647 struct rb_node *last = NULL;
2648
2649 while (*link) {
2650 struct fuse_file *ff;
2651
2652 last = *link;
2653 ff = rb_entry(last, struct fuse_file, polled_node);
2654
2655 if (kh < ff->kh)
2656 link = &last->rb_left;
2657 else if (kh > ff->kh)
2658 link = &last->rb_right;
2659 else
2660 return link;
2661 }
2662
2663 if (parent_out)
2664 *parent_out = last;
2665 return link;
2666}
2667
2668/*
2669 * The file is about to be polled. Make sure it's on the polled_files
2670 * RB tree. Note that files once added to the polled_files tree are
2671 * not removed before the file is released. This is because a file
2672 * polled once is likely to be polled again.
2673 */
2674static void fuse_register_polled_file(struct fuse_conn *fc,
2675 struct fuse_file *ff)
2676{
2677 spin_lock(&fc->lock);
2678 if (RB_EMPTY_NODE(&ff->polled_node)) {
Rajat Jainf3846262014-02-05 15:24:57 -08002679 struct rb_node **link, *uninitialized_var(parent);
Tejun Heo95668a62008-11-26 12:03:55 +01002680
2681 link = fuse_find_polled_node(fc, ff->kh, &parent);
2682 BUG_ON(*link);
2683 rb_link_node(&ff->polled_node, parent, link);
2684 rb_insert_color(&ff->polled_node, &fc->polled_files);
2685 }
2686 spin_unlock(&fc->lock);
2687}
2688
Tejun Heo08cbf542009-04-14 10:54:53 +09002689unsigned fuse_file_poll(struct file *file, poll_table *wait)
Tejun Heo95668a62008-11-26 12:03:55 +01002690{
Tejun Heo95668a62008-11-26 12:03:55 +01002691 struct fuse_file *ff = file->private_data;
Miklos Szeredi797759a2009-04-28 16:56:41 +02002692 struct fuse_conn *fc = ff->fc;
Tejun Heo95668a62008-11-26 12:03:55 +01002693 struct fuse_poll_in inarg = { .fh = ff->fh, .kh = ff->kh };
2694 struct fuse_poll_out outarg;
Miklos Szeredi70781872014-12-12 09:49:05 +01002695 FUSE_ARGS(args);
Tejun Heo95668a62008-11-26 12:03:55 +01002696 int err;
2697
2698 if (fc->no_poll)
2699 return DEFAULT_POLLMASK;
2700
2701 poll_wait(file, &ff->poll_wait, wait);
Enke Chen0415d292013-02-04 16:14:32 +01002702 inarg.events = (__u32)poll_requested_events(wait);
Tejun Heo95668a62008-11-26 12:03:55 +01002703
2704 /*
2705 * Ask for notification iff there's someone waiting for it.
2706 * The client may ignore the flag and always notify.
2707 */
2708 if (waitqueue_active(&ff->poll_wait)) {
2709 inarg.flags |= FUSE_POLL_SCHEDULE_NOTIFY;
2710 fuse_register_polled_file(fc, ff);
2711 }
2712
Miklos Szeredi70781872014-12-12 09:49:05 +01002713 args.in.h.opcode = FUSE_POLL;
2714 args.in.h.nodeid = ff->nodeid;
2715 args.in.numargs = 1;
2716 args.in.args[0].size = sizeof(inarg);
2717 args.in.args[0].value = &inarg;
2718 args.out.numargs = 1;
2719 args.out.args[0].size = sizeof(outarg);
2720 args.out.args[0].value = &outarg;
2721 err = fuse_simple_request(fc, &args);
Tejun Heo95668a62008-11-26 12:03:55 +01002722
2723 if (!err)
2724 return outarg.revents;
2725 if (err == -ENOSYS) {
2726 fc->no_poll = 1;
2727 return DEFAULT_POLLMASK;
2728 }
2729 return POLLERR;
2730}
Tejun Heo08cbf542009-04-14 10:54:53 +09002731EXPORT_SYMBOL_GPL(fuse_file_poll);
Tejun Heo95668a62008-11-26 12:03:55 +01002732
2733/*
2734 * This is called from fuse_handle_notify() on FUSE_NOTIFY_POLL and
2735 * wakes up the poll waiters.
2736 */
2737int fuse_notify_poll_wakeup(struct fuse_conn *fc,
2738 struct fuse_notify_poll_wakeup_out *outarg)
2739{
2740 u64 kh = outarg->kh;
2741 struct rb_node **link;
2742
2743 spin_lock(&fc->lock);
2744
2745 link = fuse_find_polled_node(fc, kh, NULL);
2746 if (*link) {
2747 struct fuse_file *ff;
2748
2749 ff = rb_entry(*link, struct fuse_file, polled_node);
2750 wake_up_interruptible_sync(&ff->poll_wait);
2751 }
2752
2753 spin_unlock(&fc->lock);
2754 return 0;
2755}
2756
Maxim Patlasovefb9fa92012-12-18 14:05:08 +04002757static void fuse_do_truncate(struct file *file)
2758{
2759 struct inode *inode = file->f_mapping->host;
2760 struct iattr attr;
2761
2762 attr.ia_valid = ATTR_SIZE;
2763 attr.ia_size = i_size_read(inode);
2764
2765 attr.ia_file = file;
2766 attr.ia_valid |= ATTR_FILE;
2767
2768 fuse_do_setattr(inode, &attr, file);
2769}
2770
Maxim Patlasove5c5f052013-05-30 16:41:34 +04002771static inline loff_t fuse_round_up(loff_t off)
2772{
2773 return round_up(off, FUSE_MAX_PAGES_PER_REQ << PAGE_SHIFT);
2774}
2775
Anand Avati4273b792012-02-17 12:46:25 -05002776static ssize_t
Omar Sandoval22c61862015-03-16 04:33:53 -07002777fuse_direct_IO(struct kiocb *iocb, struct iov_iter *iter, loff_t offset)
Anand Avati4273b792012-02-17 12:46:25 -05002778{
Christoph Hellwig9d5722b2015-02-02 14:59:43 +01002779 DECLARE_COMPLETION_ONSTACK(wait);
Anand Avati4273b792012-02-17 12:46:25 -05002780 ssize_t ret = 0;
Miklos Szeredi60b9df72013-05-01 14:37:21 +02002781 struct file *file = iocb->ki_filp;
2782 struct fuse_file *ff = file->private_data;
Maxim Patlasove5c5f052013-05-30 16:41:34 +04002783 bool async_dio = ff->fc->async_dio;
Anand Avati4273b792012-02-17 12:46:25 -05002784 loff_t pos = 0;
Maxim Patlasovbcba24c2012-12-14 19:21:08 +04002785 struct inode *inode;
2786 loff_t i_size;
Al Viroa6cbcd42014-03-04 22:38:00 -05002787 size_t count = iov_iter_count(iter);
Maxim Patlasov36cf66e2012-12-14 19:20:51 +04002788 struct fuse_io_priv *io;
Anand Avati4273b792012-02-17 12:46:25 -05002789
Anand Avati4273b792012-02-17 12:46:25 -05002790 pos = offset;
Maxim Patlasovbcba24c2012-12-14 19:21:08 +04002791 inode = file->f_mapping->host;
2792 i_size = i_size_read(inode);
Anand Avati4273b792012-02-17 12:46:25 -05002793
Omar Sandoval6f673762015-03-16 04:33:52 -07002794 if ((iov_iter_rw(iter) == READ) && (offset > i_size))
Steven Whitehouse9fe55ee2014-01-24 14:42:22 +00002795 return 0;
2796
Maxim Patlasov439ee5f2012-12-14 19:21:26 +04002797 /* optimization for short read */
Omar Sandoval6f673762015-03-16 04:33:52 -07002798 if (async_dio && iov_iter_rw(iter) != WRITE && offset + count > i_size) {
Maxim Patlasov439ee5f2012-12-14 19:21:26 +04002799 if (offset >= i_size)
2800 return 0;
Al Viro6b775b12015-04-07 15:06:19 -04002801 iov_iter_truncate(iter, fuse_round_up(i_size - offset));
2802 count = iov_iter_count(iter);
Maxim Patlasov439ee5f2012-12-14 19:21:26 +04002803 }
2804
Maxim Patlasovbcba24c2012-12-14 19:21:08 +04002805 io = kmalloc(sizeof(struct fuse_io_priv), GFP_KERNEL);
Maxim Patlasov36cf66e2012-12-14 19:20:51 +04002806 if (!io)
2807 return -ENOMEM;
Maxim Patlasovbcba24c2012-12-14 19:21:08 +04002808 spin_lock_init(&io->lock);
2809 io->reqs = 1;
2810 io->bytes = -1;
2811 io->size = 0;
2812 io->offset = offset;
Omar Sandoval6f673762015-03-16 04:33:52 -07002813 io->write = (iov_iter_rw(iter) == WRITE);
Maxim Patlasovbcba24c2012-12-14 19:21:08 +04002814 io->err = 0;
Maxim Patlasov36cf66e2012-12-14 19:20:51 +04002815 io->file = file;
Maxim Patlasovbcba24c2012-12-14 19:21:08 +04002816 /*
2817 * By default, we want to optimize all I/Os with async request
Miklos Szeredi60b9df72013-05-01 14:37:21 +02002818 * submission to the client filesystem if supported.
Maxim Patlasovbcba24c2012-12-14 19:21:08 +04002819 */
Maxim Patlasove5c5f052013-05-30 16:41:34 +04002820 io->async = async_dio;
Maxim Patlasovbcba24c2012-12-14 19:21:08 +04002821 io->iocb = iocb;
2822
2823 /*
2824 * We cannot asynchronously extend the size of a file. We have no method
2825 * to wait on real async I/O requests, so we must submit this request
2826 * synchronously.
2827 */
Omar Sandoval6f673762015-03-16 04:33:52 -07002828 if (!is_sync_kiocb(iocb) && (offset + count > i_size) &&
2829 iov_iter_rw(iter) == WRITE)
Maxim Patlasovbcba24c2012-12-14 19:21:08 +04002830 io->async = false;
Anand Avati4273b792012-02-17 12:46:25 -05002831
Christoph Hellwig9d5722b2015-02-02 14:59:43 +01002832 if (io->async && is_sync_kiocb(iocb))
2833 io->done = &wait;
2834
Omar Sandoval6f673762015-03-16 04:33:52 -07002835 if (iov_iter_rw(iter) == WRITE) {
Al Viro6b775b12015-04-07 15:06:19 -04002836 ret = fuse_direct_io(io, iter, &pos, FUSE_DIO_WRITE);
Al Viro812408f2015-03-30 22:15:58 -04002837 fuse_invalidate_attr(inode);
2838 } else {
Al Virod22a9432014-03-16 15:50:47 -04002839 ret = __fuse_direct_read(io, iter, &pos);
Al Viro812408f2015-03-30 22:15:58 -04002840 }
Maxim Patlasov36cf66e2012-12-14 19:20:51 +04002841
Maxim Patlasovbcba24c2012-12-14 19:21:08 +04002842 if (io->async) {
2843 fuse_aio_complete(io, ret < 0 ? ret : 0, -1);
2844
2845 /* we have a non-extending, async request, so return */
Brian Fosterc9ecf982013-05-30 15:35:50 -04002846 if (!is_sync_kiocb(iocb))
Maxim Patlasovbcba24c2012-12-14 19:21:08 +04002847 return -EIOCBQUEUED;
2848
Christoph Hellwig9d5722b2015-02-02 14:59:43 +01002849 wait_for_completion(&wait);
2850 ret = fuse_get_res_by_io(io);
Maxim Patlasovbcba24c2012-12-14 19:21:08 +04002851 }
2852
Christoph Hellwig9d5722b2015-02-02 14:59:43 +01002853 kfree(io);
2854
Omar Sandoval6f673762015-03-16 04:33:52 -07002855 if (iov_iter_rw(iter) == WRITE) {
Maxim Patlasovefb9fa92012-12-18 14:05:08 +04002856 if (ret > 0)
2857 fuse_write_update_size(inode, pos);
2858 else if (ret < 0 && offset + count > i_size)
2859 fuse_do_truncate(file);
2860 }
Anand Avati4273b792012-02-17 12:46:25 -05002861
2862 return ret;
2863}
2864
Miklos Szeredicdadb112012-11-10 16:55:56 +01002865static long fuse_file_fallocate(struct file *file, int mode, loff_t offset,
2866 loff_t length)
Anatol Pomozov05ba1f02012-04-22 18:45:24 -07002867{
2868 struct fuse_file *ff = file->private_data;
Miklos Szeredi1c682712014-12-12 10:04:51 +01002869 struct inode *inode = file_inode(file);
Maxim Patlasov0ab08f52013-09-13 19:20:16 +04002870 struct fuse_inode *fi = get_fuse_inode(inode);
Anatol Pomozov05ba1f02012-04-22 18:45:24 -07002871 struct fuse_conn *fc = ff->fc;
Miklos Szeredi70781872014-12-12 09:49:05 +01002872 FUSE_ARGS(args);
Anatol Pomozov05ba1f02012-04-22 18:45:24 -07002873 struct fuse_fallocate_in inarg = {
2874 .fh = ff->fh,
2875 .offset = offset,
2876 .length = length,
2877 .mode = mode
2878 };
2879 int err;
Maxim Patlasov14c14412013-06-13 12:16:39 +04002880 bool lock_inode = !(mode & FALLOC_FL_KEEP_SIZE) ||
2881 (mode & FALLOC_FL_PUNCH_HOLE);
Anatol Pomozov05ba1f02012-04-22 18:45:24 -07002882
Miklos Szeredi4adb8302014-04-28 14:19:21 +02002883 if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE))
2884 return -EOPNOTSUPP;
2885
Miklos Szeredi519c6042012-04-26 10:56:36 +02002886 if (fc->no_fallocate)
2887 return -EOPNOTSUPP;
2888
Maxim Patlasov14c14412013-06-13 12:16:39 +04002889 if (lock_inode) {
Brian Foster3634a632013-05-17 09:30:32 -04002890 mutex_lock(&inode->i_mutex);
Maxim Patlasovbde52782013-09-13 19:19:54 +04002891 if (mode & FALLOC_FL_PUNCH_HOLE) {
2892 loff_t endbyte = offset + length - 1;
2893 err = filemap_write_and_wait_range(inode->i_mapping,
2894 offset, endbyte);
2895 if (err)
2896 goto out;
2897
2898 fuse_sync_writes(inode);
2899 }
Brian Foster3634a632013-05-17 09:30:32 -04002900 }
2901
Maxim Patlasov0ab08f52013-09-13 19:20:16 +04002902 if (!(mode & FALLOC_FL_KEEP_SIZE))
2903 set_bit(FUSE_I_SIZE_UNSTABLE, &fi->state);
2904
Miklos Szeredi70781872014-12-12 09:49:05 +01002905 args.in.h.opcode = FUSE_FALLOCATE;
2906 args.in.h.nodeid = ff->nodeid;
2907 args.in.numargs = 1;
2908 args.in.args[0].size = sizeof(inarg);
2909 args.in.args[0].value = &inarg;
2910 err = fuse_simple_request(fc, &args);
Miklos Szeredi519c6042012-04-26 10:56:36 +02002911 if (err == -ENOSYS) {
2912 fc->no_fallocate = 1;
2913 err = -EOPNOTSUPP;
2914 }
Brian Fosterbee6c302013-05-17 15:27:34 -04002915 if (err)
2916 goto out;
2917
2918 /* we could have extended the file */
Maxim Patlasovb0aa7602013-12-26 19:51:11 +04002919 if (!(mode & FALLOC_FL_KEEP_SIZE)) {
2920 bool changed = fuse_write_update_size(inode, offset + length);
2921
Miklos Szeredi93d22692014-04-28 14:19:22 +02002922 if (changed && fc->writeback_cache)
2923 file_update_time(file);
Maxim Patlasovb0aa7602013-12-26 19:51:11 +04002924 }
Brian Fosterbee6c302013-05-17 15:27:34 -04002925
2926 if (mode & FALLOC_FL_PUNCH_HOLE)
2927 truncate_pagecache_range(inode, offset, offset + length - 1);
2928
2929 fuse_invalidate_attr(inode);
2930
Brian Foster3634a632013-05-17 09:30:32 -04002931out:
Maxim Patlasov0ab08f52013-09-13 19:20:16 +04002932 if (!(mode & FALLOC_FL_KEEP_SIZE))
2933 clear_bit(FUSE_I_SIZE_UNSTABLE, &fi->state);
2934
Maxim Patlasovbde52782013-09-13 19:19:54 +04002935 if (lock_inode)
Brian Foster3634a632013-05-17 09:30:32 -04002936 mutex_unlock(&inode->i_mutex);
Brian Foster3634a632013-05-17 09:30:32 -04002937
Anatol Pomozov05ba1f02012-04-22 18:45:24 -07002938 return err;
2939}
Anatol Pomozov05ba1f02012-04-22 18:45:24 -07002940
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -08002941static const struct file_operations fuse_file_operations = {
Miklos Szeredi5559b8f2008-04-30 00:54:45 -07002942 .llseek = fuse_file_llseek,
Al Viro37c20f12014-04-02 14:47:09 -04002943 .read_iter = fuse_file_read_iter,
Al Viro84c3d552014-04-03 14:33:23 -04002944 .write_iter = fuse_file_write_iter,
Miklos Szeredib6aeade2005-09-09 13:10:30 -07002945 .mmap = fuse_file_mmap,
2946 .open = fuse_open,
2947 .flush = fuse_flush,
2948 .release = fuse_release,
2949 .fsync = fuse_fsync,
Miklos Szeredi71421252006-06-25 05:48:52 -07002950 .lock = fuse_file_lock,
Miklos Szeredia9ff4f82007-10-18 03:07:02 -07002951 .flock = fuse_file_flock,
Jens Axboe5ffc4ef2007-06-01 11:49:19 +02002952 .splice_read = generic_file_splice_read,
Tejun Heo59efec72008-11-26 12:03:55 +01002953 .unlocked_ioctl = fuse_file_ioctl,
2954 .compat_ioctl = fuse_file_compat_ioctl,
Tejun Heo95668a62008-11-26 12:03:55 +01002955 .poll = fuse_file_poll,
Anatol Pomozov05ba1f02012-04-22 18:45:24 -07002956 .fallocate = fuse_file_fallocate,
Miklos Szeredib6aeade2005-09-09 13:10:30 -07002957};
2958
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -08002959static const struct file_operations fuse_direct_io_file_operations = {
Miklos Szeredi5559b8f2008-04-30 00:54:45 -07002960 .llseek = fuse_file_llseek,
Al Viro15316262015-03-30 22:08:36 -04002961 .read_iter = fuse_direct_read_iter,
Al Viro15316262015-03-30 22:08:36 -04002962 .write_iter = fuse_direct_write_iter,
Miklos Szeredifc280c92009-04-02 14:25:35 +02002963 .mmap = fuse_direct_mmap,
Miklos Szeredi413ef8c2005-09-09 13:10:35 -07002964 .open = fuse_open,
2965 .flush = fuse_flush,
2966 .release = fuse_release,
2967 .fsync = fuse_fsync,
Miklos Szeredi71421252006-06-25 05:48:52 -07002968 .lock = fuse_file_lock,
Miklos Szeredia9ff4f82007-10-18 03:07:02 -07002969 .flock = fuse_file_flock,
Tejun Heo59efec72008-11-26 12:03:55 +01002970 .unlocked_ioctl = fuse_file_ioctl,
2971 .compat_ioctl = fuse_file_compat_ioctl,
Tejun Heo95668a62008-11-26 12:03:55 +01002972 .poll = fuse_file_poll,
Anatol Pomozov05ba1f02012-04-22 18:45:24 -07002973 .fallocate = fuse_file_fallocate,
Miklos Szeredifc280c92009-04-02 14:25:35 +02002974 /* no splice_read */
Miklos Szeredi413ef8c2005-09-09 13:10:35 -07002975};
2976
Christoph Hellwigf5e54d62006-06-28 04:26:44 -07002977static const struct address_space_operations fuse_file_aops = {
Miklos Szeredib6aeade2005-09-09 13:10:30 -07002978 .readpage = fuse_readpage,
Miklos Szeredi3be5a522008-04-30 00:54:41 -07002979 .writepage = fuse_writepage,
Pavel Emelyanov26d614d2013-06-29 21:45:29 +04002980 .writepages = fuse_writepages,
Miklos Szeredi3be5a522008-04-30 00:54:41 -07002981 .launder_page = fuse_launder_page,
Miklos Szeredidb50b962005-09-09 13:10:33 -07002982 .readpages = fuse_readpages,
Miklos Szeredi3be5a522008-04-30 00:54:41 -07002983 .set_page_dirty = __set_page_dirty_nobuffers,
Miklos Szeredib2d22722006-12-06 20:35:51 -08002984 .bmap = fuse_bmap,
Anand Avati4273b792012-02-17 12:46:25 -05002985 .direct_IO = fuse_direct_IO,
Pavel Emelyanov6b12c1b2013-10-10 17:11:43 +04002986 .write_begin = fuse_write_begin,
2987 .write_end = fuse_write_end,
Miklos Szeredib6aeade2005-09-09 13:10:30 -07002988};
2989
2990void fuse_init_file_inode(struct inode *inode)
2991{
Miklos Szeredi45323fb2005-09-09 13:10:37 -07002992 inode->i_fop = &fuse_file_operations;
2993 inode->i_data.a_ops = &fuse_file_aops;
Miklos Szeredib6aeade2005-09-09 13:10:30 -07002994}