Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1 | /* |
| 2 | FUSE: Filesystem in Userspace |
Miklos Szeredi | 1729a16 | 2008-11-26 12:03:54 +0100 | [diff] [blame] | 3 | Copyright (C) 2001-2008 Miklos Szeredi <miklos@szeredi.hu> |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 4 | |
| 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/init.h> |
| 12 | #include <linux/module.h> |
| 13 | #include <linux/poll.h> |
| 14 | #include <linux/uio.h> |
| 15 | #include <linux/miscdevice.h> |
| 16 | #include <linux/pagemap.h> |
| 17 | #include <linux/file.h> |
| 18 | #include <linux/slab.h> |
Miklos Szeredi | dd3bb14 | 2010-05-25 15:06:06 +0200 | [diff] [blame] | 19 | #include <linux/pipe_fs_i.h> |
Miklos Szeredi | ce534fb | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 20 | #include <linux/swap.h> |
| 21 | #include <linux/splice.h> |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 22 | |
| 23 | MODULE_ALIAS_MISCDEV(FUSE_MINOR); |
Kay Sievers | 578454f | 2010-05-20 18:07:20 +0200 | [diff] [blame] | 24 | MODULE_ALIAS("devname:fuse"); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 25 | |
Christoph Lameter | e18b890 | 2006-12-06 20:33:20 -0800 | [diff] [blame] | 26 | static struct kmem_cache *fuse_req_cachep; |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 27 | |
Miklos Szeredi | 8bfc016 | 2006-01-16 22:14:28 -0800 | [diff] [blame] | 28 | static struct fuse_conn *fuse_get_conn(struct file *file) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 29 | { |
Miklos Szeredi | 0720b31 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 30 | /* |
| 31 | * Lockless access is OK, because file->private data is set |
| 32 | * once during mount and is valid until the file is released. |
| 33 | */ |
| 34 | return file->private_data; |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 35 | } |
| 36 | |
Miklos Szeredi | 8bfc016 | 2006-01-16 22:14:28 -0800 | [diff] [blame] | 37 | static void fuse_request_init(struct fuse_req *req) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 38 | { |
| 39 | memset(req, 0, sizeof(*req)); |
| 40 | INIT_LIST_HEAD(&req->list); |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 41 | INIT_LIST_HEAD(&req->intr_entry); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 42 | init_waitqueue_head(&req->waitq); |
| 43 | atomic_set(&req->count, 1); |
| 44 | } |
| 45 | |
| 46 | struct fuse_req *fuse_request_alloc(void) |
| 47 | { |
Christoph Lameter | e94b176 | 2006-12-06 20:33:17 -0800 | [diff] [blame] | 48 | struct fuse_req *req = kmem_cache_alloc(fuse_req_cachep, GFP_KERNEL); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 49 | if (req) |
| 50 | fuse_request_init(req); |
| 51 | return req; |
| 52 | } |
Tejun Heo | 08cbf54 | 2009-04-14 10:54:53 +0900 | [diff] [blame] | 53 | EXPORT_SYMBOL_GPL(fuse_request_alloc); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 54 | |
Miklos Szeredi | 3be5a52 | 2008-04-30 00:54:41 -0700 | [diff] [blame] | 55 | struct fuse_req *fuse_request_alloc_nofs(void) |
| 56 | { |
| 57 | struct fuse_req *req = kmem_cache_alloc(fuse_req_cachep, GFP_NOFS); |
| 58 | if (req) |
| 59 | fuse_request_init(req); |
| 60 | return req; |
| 61 | } |
| 62 | |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 63 | void fuse_request_free(struct fuse_req *req) |
| 64 | { |
| 65 | kmem_cache_free(fuse_req_cachep, req); |
| 66 | } |
| 67 | |
Miklos Szeredi | 8bfc016 | 2006-01-16 22:14:28 -0800 | [diff] [blame] | 68 | static void block_sigs(sigset_t *oldset) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 69 | { |
| 70 | sigset_t mask; |
| 71 | |
| 72 | siginitsetinv(&mask, sigmask(SIGKILL)); |
| 73 | sigprocmask(SIG_BLOCK, &mask, oldset); |
| 74 | } |
| 75 | |
Miklos Szeredi | 8bfc016 | 2006-01-16 22:14:28 -0800 | [diff] [blame] | 76 | static void restore_sigs(sigset_t *oldset) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 77 | { |
| 78 | sigprocmask(SIG_SETMASK, oldset, NULL); |
| 79 | } |
| 80 | |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 81 | static void __fuse_get_request(struct fuse_req *req) |
| 82 | { |
| 83 | atomic_inc(&req->count); |
| 84 | } |
| 85 | |
| 86 | /* Must be called with > 1 refcount */ |
| 87 | static void __fuse_put_request(struct fuse_req *req) |
| 88 | { |
| 89 | BUG_ON(atomic_read(&req->count) < 2); |
| 90 | atomic_dec(&req->count); |
| 91 | } |
| 92 | |
Miklos Szeredi | 33649c9 | 2006-06-25 05:48:52 -0700 | [diff] [blame] | 93 | static void fuse_req_init_context(struct fuse_req *req) |
| 94 | { |
David Howells | 2186a71 | 2008-11-14 10:38:53 +1100 | [diff] [blame] | 95 | req->in.h.uid = current_fsuid(); |
| 96 | req->in.h.gid = current_fsgid(); |
Miklos Szeredi | 33649c9 | 2006-06-25 05:48:52 -0700 | [diff] [blame] | 97 | req->in.h.pid = current->pid; |
| 98 | } |
| 99 | |
Miklos Szeredi | ce1d5a4 | 2006-04-10 22:54:58 -0700 | [diff] [blame] | 100 | struct fuse_req *fuse_get_req(struct fuse_conn *fc) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 101 | { |
Miklos Szeredi | 08a53cd | 2006-04-10 22:54:59 -0700 | [diff] [blame] | 102 | struct fuse_req *req; |
| 103 | sigset_t oldset; |
Miklos Szeredi | 9bc5ddd | 2006-04-11 21:16:09 +0200 | [diff] [blame] | 104 | int intr; |
Miklos Szeredi | 08a53cd | 2006-04-10 22:54:59 -0700 | [diff] [blame] | 105 | int err; |
| 106 | |
Miklos Szeredi | 9bc5ddd | 2006-04-11 21:16:09 +0200 | [diff] [blame] | 107 | atomic_inc(&fc->num_waiting); |
Miklos Szeredi | 08a53cd | 2006-04-10 22:54:59 -0700 | [diff] [blame] | 108 | block_sigs(&oldset); |
Miklos Szeredi | 9bc5ddd | 2006-04-11 21:16:09 +0200 | [diff] [blame] | 109 | intr = wait_event_interruptible(fc->blocked_waitq, !fc->blocked); |
Miklos Szeredi | 08a53cd | 2006-04-10 22:54:59 -0700 | [diff] [blame] | 110 | restore_sigs(&oldset); |
Miklos Szeredi | 9bc5ddd | 2006-04-11 21:16:09 +0200 | [diff] [blame] | 111 | err = -EINTR; |
| 112 | if (intr) |
| 113 | goto out; |
Miklos Szeredi | 08a53cd | 2006-04-10 22:54:59 -0700 | [diff] [blame] | 114 | |
Miklos Szeredi | 51eb01e | 2006-06-25 05:48:50 -0700 | [diff] [blame] | 115 | err = -ENOTCONN; |
| 116 | if (!fc->connected) |
| 117 | goto out; |
| 118 | |
Miklos Szeredi | 08a53cd | 2006-04-10 22:54:59 -0700 | [diff] [blame] | 119 | req = fuse_request_alloc(); |
Miklos Szeredi | 9bc5ddd | 2006-04-11 21:16:09 +0200 | [diff] [blame] | 120 | err = -ENOMEM; |
Miklos Szeredi | ce1d5a4 | 2006-04-10 22:54:58 -0700 | [diff] [blame] | 121 | if (!req) |
Miklos Szeredi | 9bc5ddd | 2006-04-11 21:16:09 +0200 | [diff] [blame] | 122 | goto out; |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 123 | |
Miklos Szeredi | 33649c9 | 2006-06-25 05:48:52 -0700 | [diff] [blame] | 124 | fuse_req_init_context(req); |
Miklos Szeredi | 9bc5ddd | 2006-04-11 21:16:09 +0200 | [diff] [blame] | 125 | req->waiting = 1; |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 126 | return req; |
Miklos Szeredi | 9bc5ddd | 2006-04-11 21:16:09 +0200 | [diff] [blame] | 127 | |
| 128 | out: |
| 129 | atomic_dec(&fc->num_waiting); |
| 130 | return ERR_PTR(err); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 131 | } |
Tejun Heo | 08cbf54 | 2009-04-14 10:54:53 +0900 | [diff] [blame] | 132 | EXPORT_SYMBOL_GPL(fuse_get_req); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 133 | |
Miklos Szeredi | 33649c9 | 2006-06-25 05:48:52 -0700 | [diff] [blame] | 134 | /* |
| 135 | * Return request in fuse_file->reserved_req. However that may |
| 136 | * currently be in use. If that is the case, wait for it to become |
| 137 | * available. |
| 138 | */ |
| 139 | static struct fuse_req *get_reserved_req(struct fuse_conn *fc, |
| 140 | struct file *file) |
| 141 | { |
| 142 | struct fuse_req *req = NULL; |
| 143 | struct fuse_file *ff = file->private_data; |
| 144 | |
| 145 | do { |
Miklos Szeredi | de5e3de | 2007-10-16 23:31:00 -0700 | [diff] [blame] | 146 | wait_event(fc->reserved_req_waitq, ff->reserved_req); |
Miklos Szeredi | 33649c9 | 2006-06-25 05:48:52 -0700 | [diff] [blame] | 147 | spin_lock(&fc->lock); |
| 148 | if (ff->reserved_req) { |
| 149 | req = ff->reserved_req; |
| 150 | ff->reserved_req = NULL; |
| 151 | get_file(file); |
| 152 | req->stolen_file = file; |
| 153 | } |
| 154 | spin_unlock(&fc->lock); |
| 155 | } while (!req); |
| 156 | |
| 157 | return req; |
| 158 | } |
| 159 | |
| 160 | /* |
| 161 | * Put stolen request back into fuse_file->reserved_req |
| 162 | */ |
| 163 | static void put_reserved_req(struct fuse_conn *fc, struct fuse_req *req) |
| 164 | { |
| 165 | struct file *file = req->stolen_file; |
| 166 | struct fuse_file *ff = file->private_data; |
| 167 | |
| 168 | spin_lock(&fc->lock); |
| 169 | fuse_request_init(req); |
| 170 | BUG_ON(ff->reserved_req); |
| 171 | ff->reserved_req = req; |
Miklos Szeredi | de5e3de | 2007-10-16 23:31:00 -0700 | [diff] [blame] | 172 | wake_up_all(&fc->reserved_req_waitq); |
Miklos Szeredi | 33649c9 | 2006-06-25 05:48:52 -0700 | [diff] [blame] | 173 | spin_unlock(&fc->lock); |
| 174 | fput(file); |
| 175 | } |
| 176 | |
| 177 | /* |
| 178 | * Gets a requests for a file operation, always succeeds |
| 179 | * |
| 180 | * This is used for sending the FLUSH request, which must get to |
| 181 | * userspace, due to POSIX locks which may need to be unlocked. |
| 182 | * |
| 183 | * If allocation fails due to OOM, use the reserved request in |
| 184 | * fuse_file. |
| 185 | * |
| 186 | * This is very unlikely to deadlock accidentally, since the |
| 187 | * filesystem should not have it's own file open. If deadlock is |
| 188 | * intentional, it can still be broken by "aborting" the filesystem. |
| 189 | */ |
| 190 | struct fuse_req *fuse_get_req_nofail(struct fuse_conn *fc, struct file *file) |
| 191 | { |
| 192 | struct fuse_req *req; |
| 193 | |
| 194 | atomic_inc(&fc->num_waiting); |
| 195 | wait_event(fc->blocked_waitq, !fc->blocked); |
| 196 | req = fuse_request_alloc(); |
| 197 | if (!req) |
| 198 | req = get_reserved_req(fc, file); |
| 199 | |
| 200 | fuse_req_init_context(req); |
| 201 | req->waiting = 1; |
| 202 | return req; |
| 203 | } |
| 204 | |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 205 | void fuse_put_request(struct fuse_conn *fc, struct fuse_req *req) |
| 206 | { |
Miklos Szeredi | 7128ec2 | 2006-02-04 23:27:40 -0800 | [diff] [blame] | 207 | if (atomic_dec_and_test(&req->count)) { |
Miklos Szeredi | 9bc5ddd | 2006-04-11 21:16:09 +0200 | [diff] [blame] | 208 | if (req->waiting) |
| 209 | atomic_dec(&fc->num_waiting); |
Miklos Szeredi | 33649c9 | 2006-06-25 05:48:52 -0700 | [diff] [blame] | 210 | |
| 211 | if (req->stolen_file) |
| 212 | put_reserved_req(fc, req); |
| 213 | else |
| 214 | fuse_request_free(req); |
Miklos Szeredi | 7128ec2 | 2006-02-04 23:27:40 -0800 | [diff] [blame] | 215 | } |
| 216 | } |
Tejun Heo | 08cbf54 | 2009-04-14 10:54:53 +0900 | [diff] [blame] | 217 | EXPORT_SYMBOL_GPL(fuse_put_request); |
Miklos Szeredi | 7128ec2 | 2006-02-04 23:27:40 -0800 | [diff] [blame] | 218 | |
Miklos Szeredi | d12def1 | 2008-02-06 01:38:39 -0800 | [diff] [blame] | 219 | static unsigned len_args(unsigned numargs, struct fuse_arg *args) |
| 220 | { |
| 221 | unsigned nbytes = 0; |
| 222 | unsigned i; |
| 223 | |
| 224 | for (i = 0; i < numargs; i++) |
| 225 | nbytes += args[i].size; |
| 226 | |
| 227 | return nbytes; |
| 228 | } |
| 229 | |
| 230 | static u64 fuse_get_unique(struct fuse_conn *fc) |
| 231 | { |
| 232 | fc->reqctr++; |
| 233 | /* zero is special */ |
| 234 | if (fc->reqctr == 0) |
| 235 | fc->reqctr = 1; |
| 236 | |
| 237 | return fc->reqctr; |
| 238 | } |
| 239 | |
| 240 | static void queue_request(struct fuse_conn *fc, struct fuse_req *req) |
| 241 | { |
| 242 | req->in.h.unique = fuse_get_unique(fc); |
| 243 | req->in.h.len = sizeof(struct fuse_in_header) + |
| 244 | len_args(req->in.numargs, (struct fuse_arg *) req->in.args); |
| 245 | list_add_tail(&req->list, &fc->pending); |
| 246 | req->state = FUSE_REQ_PENDING; |
| 247 | if (!req->waiting) { |
| 248 | req->waiting = 1; |
| 249 | atomic_inc(&fc->num_waiting); |
| 250 | } |
| 251 | wake_up(&fc->waitq); |
| 252 | kill_fasync(&fc->fasync, SIGIO, POLL_IN); |
| 253 | } |
| 254 | |
| 255 | static void flush_bg_queue(struct fuse_conn *fc) |
| 256 | { |
Csaba Henk | 7a6d3c8 | 2009-07-01 17:28:41 -0700 | [diff] [blame] | 257 | while (fc->active_background < fc->max_background && |
Miklos Szeredi | d12def1 | 2008-02-06 01:38:39 -0800 | [diff] [blame] | 258 | !list_empty(&fc->bg_queue)) { |
| 259 | struct fuse_req *req; |
| 260 | |
| 261 | req = list_entry(fc->bg_queue.next, struct fuse_req, list); |
| 262 | list_del(&req->list); |
| 263 | fc->active_background++; |
| 264 | queue_request(fc, req); |
| 265 | } |
| 266 | } |
| 267 | |
Miklos Szeredi | 6dbbcb1 | 2006-04-26 10:49:06 +0200 | [diff] [blame] | 268 | /* |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 269 | * This function is called when a request is finished. Either a reply |
Miklos Szeredi | f9a2842 | 2006-06-25 05:48:53 -0700 | [diff] [blame] | 270 | * has arrived or it was aborted (and not yet sent) or some error |
Miklos Szeredi | f43b155 | 2006-01-16 22:14:26 -0800 | [diff] [blame] | 271 | * occurred during communication with userspace, or the device file |
Miklos Szeredi | 51eb01e | 2006-06-25 05:48:50 -0700 | [diff] [blame] | 272 | * was closed. The requester thread is woken up (if still waiting), |
| 273 | * the 'end' callback is called if given, else the reference to the |
| 274 | * request is released |
Miklos Szeredi | 7128ec2 | 2006-02-04 23:27:40 -0800 | [diff] [blame] | 275 | * |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 276 | * Called with fc->lock, unlocks it |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 277 | */ |
| 278 | static void request_end(struct fuse_conn *fc, struct fuse_req *req) |
Harvey Harrison | 5d9ec85 | 2008-12-02 14:49:42 +0100 | [diff] [blame] | 279 | __releases(&fc->lock) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 280 | { |
Miklos Szeredi | 51eb01e | 2006-06-25 05:48:50 -0700 | [diff] [blame] | 281 | void (*end) (struct fuse_conn *, struct fuse_req *) = req->end; |
| 282 | req->end = NULL; |
Miklos Szeredi | d77a1d5 | 2006-01-16 22:14:31 -0800 | [diff] [blame] | 283 | list_del(&req->list); |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 284 | list_del(&req->intr_entry); |
Miklos Szeredi | 83cfd49 | 2006-01-16 22:14:31 -0800 | [diff] [blame] | 285 | req->state = FUSE_REQ_FINISHED; |
Miklos Szeredi | 51eb01e | 2006-06-25 05:48:50 -0700 | [diff] [blame] | 286 | if (req->background) { |
Csaba Henk | 7a6d3c8 | 2009-07-01 17:28:41 -0700 | [diff] [blame] | 287 | if (fc->num_background == fc->max_background) { |
Miklos Szeredi | 51eb01e | 2006-06-25 05:48:50 -0700 | [diff] [blame] | 288 | fc->blocked = 0; |
| 289 | wake_up_all(&fc->blocked_waitq); |
| 290 | } |
Csaba Henk | 7a6d3c8 | 2009-07-01 17:28:41 -0700 | [diff] [blame] | 291 | if (fc->num_background == fc->congestion_threshold && |
Tejun Heo | a325f9b | 2009-04-14 10:54:52 +0900 | [diff] [blame] | 292 | fc->connected && fc->bdi_initialized) { |
Jens Axboe | 8aa7e84 | 2009-07-09 14:52:32 +0200 | [diff] [blame] | 293 | clear_bdi_congested(&fc->bdi, BLK_RW_SYNC); |
| 294 | clear_bdi_congested(&fc->bdi, BLK_RW_ASYNC); |
Miklos Szeredi | f92b99b | 2007-10-16 23:30:59 -0700 | [diff] [blame] | 295 | } |
Miklos Szeredi | 51eb01e | 2006-06-25 05:48:50 -0700 | [diff] [blame] | 296 | fc->num_background--; |
Miklos Szeredi | d12def1 | 2008-02-06 01:38:39 -0800 | [diff] [blame] | 297 | fc->active_background--; |
| 298 | flush_bg_queue(fc); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 299 | } |
Miklos Szeredi | 51eb01e | 2006-06-25 05:48:50 -0700 | [diff] [blame] | 300 | spin_unlock(&fc->lock); |
Miklos Szeredi | 51eb01e | 2006-06-25 05:48:50 -0700 | [diff] [blame] | 301 | wake_up(&req->waitq); |
| 302 | if (end) |
| 303 | end(fc, req); |
Tejun Heo | e9bb09d | 2008-11-26 12:03:54 +0100 | [diff] [blame] | 304 | fuse_put_request(fc, req); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 305 | } |
| 306 | |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 307 | static void wait_answer_interruptible(struct fuse_conn *fc, |
| 308 | struct fuse_req *req) |
Harvey Harrison | 5d9ec85 | 2008-12-02 14:49:42 +0100 | [diff] [blame] | 309 | __releases(&fc->lock) |
| 310 | __acquires(&fc->lock) |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 311 | { |
| 312 | if (signal_pending(current)) |
| 313 | return; |
| 314 | |
| 315 | spin_unlock(&fc->lock); |
| 316 | wait_event_interruptible(req->waitq, req->state == FUSE_REQ_FINISHED); |
| 317 | spin_lock(&fc->lock); |
| 318 | } |
| 319 | |
| 320 | static void queue_interrupt(struct fuse_conn *fc, struct fuse_req *req) |
| 321 | { |
| 322 | list_add_tail(&req->intr_entry, &fc->interrupts); |
| 323 | wake_up(&fc->waitq); |
| 324 | kill_fasync(&fc->fasync, SIGIO, POLL_IN); |
| 325 | } |
| 326 | |
Miklos Szeredi | 7c352bd | 2005-09-09 13:10:39 -0700 | [diff] [blame] | 327 | static void request_wait_answer(struct fuse_conn *fc, struct fuse_req *req) |
Harvey Harrison | 5d9ec85 | 2008-12-02 14:49:42 +0100 | [diff] [blame] | 328 | __releases(&fc->lock) |
| 329 | __acquires(&fc->lock) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 330 | { |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 331 | if (!fc->no_interrupt) { |
| 332 | /* Any signal may interrupt this */ |
| 333 | wait_answer_interruptible(fc, req); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 334 | |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 335 | if (req->aborted) |
| 336 | goto aborted; |
| 337 | if (req->state == FUSE_REQ_FINISHED) |
| 338 | return; |
| 339 | |
| 340 | req->interrupted = 1; |
| 341 | if (req->state == FUSE_REQ_SENT) |
| 342 | queue_interrupt(fc, req); |
| 343 | } |
| 344 | |
Miklos Szeredi | a131de0 | 2007-10-16 23:31:04 -0700 | [diff] [blame] | 345 | if (!req->force) { |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 346 | sigset_t oldset; |
| 347 | |
| 348 | /* Only fatal signals may interrupt this */ |
Miklos Szeredi | 51eb01e | 2006-06-25 05:48:50 -0700 | [diff] [blame] | 349 | block_sigs(&oldset); |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 350 | wait_answer_interruptible(fc, req); |
Miklos Szeredi | 51eb01e | 2006-06-25 05:48:50 -0700 | [diff] [blame] | 351 | restore_sigs(&oldset); |
Miklos Szeredi | a131de0 | 2007-10-16 23:31:04 -0700 | [diff] [blame] | 352 | |
| 353 | if (req->aborted) |
| 354 | goto aborted; |
| 355 | if (req->state == FUSE_REQ_FINISHED) |
| 356 | return; |
| 357 | |
| 358 | /* Request is not yet in userspace, bail out */ |
| 359 | if (req->state == FUSE_REQ_PENDING) { |
| 360 | list_del(&req->list); |
| 361 | __fuse_put_request(req); |
| 362 | req->out.h.error = -EINTR; |
| 363 | return; |
| 364 | } |
Miklos Szeredi | 51eb01e | 2006-06-25 05:48:50 -0700 | [diff] [blame] | 365 | } |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 366 | |
Miklos Szeredi | a131de0 | 2007-10-16 23:31:04 -0700 | [diff] [blame] | 367 | /* |
| 368 | * Either request is already in userspace, or it was forced. |
| 369 | * Wait it out. |
| 370 | */ |
| 371 | spin_unlock(&fc->lock); |
| 372 | wait_event(req->waitq, req->state == FUSE_REQ_FINISHED); |
| 373 | spin_lock(&fc->lock); |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 374 | |
Miklos Szeredi | a131de0 | 2007-10-16 23:31:04 -0700 | [diff] [blame] | 375 | if (!req->aborted) |
| 376 | return; |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 377 | |
| 378 | aborted: |
Miklos Szeredi | a131de0 | 2007-10-16 23:31:04 -0700 | [diff] [blame] | 379 | BUG_ON(req->state != FUSE_REQ_FINISHED); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 380 | if (req->locked) { |
| 381 | /* This is uninterruptible sleep, because data is |
| 382 | being copied to/from the buffers of req. During |
| 383 | locked state, there mustn't be any filesystem |
| 384 | operation (e.g. page fault), since that could lead |
| 385 | to deadlock */ |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 386 | spin_unlock(&fc->lock); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 387 | wait_event(req->waitq, !req->locked); |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 388 | spin_lock(&fc->lock); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 389 | } |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 390 | } |
| 391 | |
Tejun Heo | b93f858 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 392 | void fuse_request_send(struct fuse_conn *fc, struct fuse_req *req) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 393 | { |
| 394 | req->isreply = 1; |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 395 | spin_lock(&fc->lock); |
Miklos Szeredi | 1e9a4ed | 2005-09-09 13:10:31 -0700 | [diff] [blame] | 396 | if (!fc->connected) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 397 | req->out.h.error = -ENOTCONN; |
| 398 | else if (fc->conn_error) |
| 399 | req->out.h.error = -ECONNREFUSED; |
| 400 | else { |
| 401 | queue_request(fc, req); |
| 402 | /* acquire extra reference, since request is still needed |
| 403 | after request_end() */ |
| 404 | __fuse_get_request(req); |
| 405 | |
Miklos Szeredi | 7c352bd | 2005-09-09 13:10:39 -0700 | [diff] [blame] | 406 | request_wait_answer(fc, req); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 407 | } |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 408 | spin_unlock(&fc->lock); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 409 | } |
Tejun Heo | 08cbf54 | 2009-04-14 10:54:53 +0900 | [diff] [blame] | 410 | EXPORT_SYMBOL_GPL(fuse_request_send); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 411 | |
Tejun Heo | b93f858 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 412 | static void fuse_request_send_nowait_locked(struct fuse_conn *fc, |
| 413 | struct fuse_req *req) |
Miklos Szeredi | d12def1 | 2008-02-06 01:38:39 -0800 | [diff] [blame] | 414 | { |
| 415 | req->background = 1; |
| 416 | fc->num_background++; |
Csaba Henk | 7a6d3c8 | 2009-07-01 17:28:41 -0700 | [diff] [blame] | 417 | if (fc->num_background == fc->max_background) |
Miklos Szeredi | d12def1 | 2008-02-06 01:38:39 -0800 | [diff] [blame] | 418 | fc->blocked = 1; |
Csaba Henk | 7a6d3c8 | 2009-07-01 17:28:41 -0700 | [diff] [blame] | 419 | if (fc->num_background == fc->congestion_threshold && |
Tejun Heo | a325f9b | 2009-04-14 10:54:52 +0900 | [diff] [blame] | 420 | fc->bdi_initialized) { |
Jens Axboe | 8aa7e84 | 2009-07-09 14:52:32 +0200 | [diff] [blame] | 421 | set_bdi_congested(&fc->bdi, BLK_RW_SYNC); |
| 422 | set_bdi_congested(&fc->bdi, BLK_RW_ASYNC); |
Miklos Szeredi | d12def1 | 2008-02-06 01:38:39 -0800 | [diff] [blame] | 423 | } |
| 424 | list_add_tail(&req->list, &fc->bg_queue); |
| 425 | flush_bg_queue(fc); |
| 426 | } |
| 427 | |
Tejun Heo | b93f858 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 428 | static void fuse_request_send_nowait(struct fuse_conn *fc, struct fuse_req *req) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 429 | { |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 430 | spin_lock(&fc->lock); |
Miklos Szeredi | 1e9a4ed | 2005-09-09 13:10:31 -0700 | [diff] [blame] | 431 | if (fc->connected) { |
Tejun Heo | b93f858 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 432 | fuse_request_send_nowait_locked(fc, req); |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 433 | spin_unlock(&fc->lock); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 434 | } else { |
| 435 | req->out.h.error = -ENOTCONN; |
| 436 | request_end(fc, req); |
| 437 | } |
| 438 | } |
| 439 | |
Tejun Heo | b93f858 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 440 | void fuse_request_send_noreply(struct fuse_conn *fc, struct fuse_req *req) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 441 | { |
| 442 | req->isreply = 0; |
Tejun Heo | b93f858 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 443 | fuse_request_send_nowait(fc, req); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 444 | } |
| 445 | |
Tejun Heo | b93f858 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 446 | void fuse_request_send_background(struct fuse_conn *fc, struct fuse_req *req) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 447 | { |
| 448 | req->isreply = 1; |
Tejun Heo | b93f858 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 449 | fuse_request_send_nowait(fc, req); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 450 | } |
Tejun Heo | 08cbf54 | 2009-04-14 10:54:53 +0900 | [diff] [blame] | 451 | EXPORT_SYMBOL_GPL(fuse_request_send_background); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 452 | |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 453 | /* |
Miklos Szeredi | 3be5a52 | 2008-04-30 00:54:41 -0700 | [diff] [blame] | 454 | * Called under fc->lock |
| 455 | * |
| 456 | * fc->connected must have been checked previously |
| 457 | */ |
Tejun Heo | b93f858 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 458 | void fuse_request_send_background_locked(struct fuse_conn *fc, |
| 459 | struct fuse_req *req) |
Miklos Szeredi | 3be5a52 | 2008-04-30 00:54:41 -0700 | [diff] [blame] | 460 | { |
| 461 | req->isreply = 1; |
Tejun Heo | b93f858 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 462 | fuse_request_send_nowait_locked(fc, req); |
Miklos Szeredi | 3be5a52 | 2008-04-30 00:54:41 -0700 | [diff] [blame] | 463 | } |
| 464 | |
| 465 | /* |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 466 | * Lock the request. Up to the next unlock_request() there mustn't be |
| 467 | * anything that could cause a page-fault. If the request was already |
Miklos Szeredi | f9a2842 | 2006-06-25 05:48:53 -0700 | [diff] [blame] | 468 | * aborted bail out. |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 469 | */ |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 470 | static int lock_request(struct fuse_conn *fc, struct fuse_req *req) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 471 | { |
| 472 | int err = 0; |
| 473 | if (req) { |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 474 | spin_lock(&fc->lock); |
Miklos Szeredi | f9a2842 | 2006-06-25 05:48:53 -0700 | [diff] [blame] | 475 | if (req->aborted) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 476 | err = -ENOENT; |
| 477 | else |
| 478 | req->locked = 1; |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 479 | spin_unlock(&fc->lock); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 480 | } |
| 481 | return err; |
| 482 | } |
| 483 | |
| 484 | /* |
Miklos Szeredi | f9a2842 | 2006-06-25 05:48:53 -0700 | [diff] [blame] | 485 | * Unlock request. If it was aborted during being locked, the |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 486 | * requester thread is currently waiting for it to be unlocked, so |
| 487 | * wake it up. |
| 488 | */ |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 489 | static void unlock_request(struct fuse_conn *fc, struct fuse_req *req) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 490 | { |
| 491 | if (req) { |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 492 | spin_lock(&fc->lock); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 493 | req->locked = 0; |
Miklos Szeredi | f9a2842 | 2006-06-25 05:48:53 -0700 | [diff] [blame] | 494 | if (req->aborted) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 495 | wake_up(&req->waitq); |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 496 | spin_unlock(&fc->lock); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 497 | } |
| 498 | } |
| 499 | |
| 500 | struct fuse_copy_state { |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 501 | struct fuse_conn *fc; |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 502 | int write; |
| 503 | struct fuse_req *req; |
| 504 | const struct iovec *iov; |
Miklos Szeredi | dd3bb14 | 2010-05-25 15:06:06 +0200 | [diff] [blame] | 505 | struct pipe_buffer *pipebufs; |
| 506 | struct pipe_buffer *currbuf; |
| 507 | struct pipe_inode_info *pipe; |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 508 | unsigned long nr_segs; |
| 509 | unsigned long seglen; |
| 510 | unsigned long addr; |
| 511 | struct page *pg; |
| 512 | void *mapaddr; |
| 513 | void *buf; |
| 514 | unsigned len; |
Miklos Szeredi | ce534fb | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 515 | unsigned move_pages:1; |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 516 | }; |
| 517 | |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 518 | static void fuse_copy_init(struct fuse_copy_state *cs, struct fuse_conn *fc, |
Miklos Szeredi | c302162 | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 519 | int write, |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 520 | const struct iovec *iov, unsigned long nr_segs) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 521 | { |
| 522 | memset(cs, 0, sizeof(*cs)); |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 523 | cs->fc = fc; |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 524 | cs->write = write; |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 525 | cs->iov = iov; |
| 526 | cs->nr_segs = nr_segs; |
| 527 | } |
| 528 | |
| 529 | /* Unmap and put previous page of userspace buffer */ |
Miklos Szeredi | 8bfc016 | 2006-01-16 22:14:28 -0800 | [diff] [blame] | 530 | static void fuse_copy_finish(struct fuse_copy_state *cs) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 531 | { |
Miklos Szeredi | dd3bb14 | 2010-05-25 15:06:06 +0200 | [diff] [blame] | 532 | if (cs->currbuf) { |
| 533 | struct pipe_buffer *buf = cs->currbuf; |
| 534 | |
Miklos Szeredi | c302162 | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 535 | if (!cs->write) { |
| 536 | buf->ops->unmap(cs->pipe, buf, cs->mapaddr); |
| 537 | } else { |
Miklos Szeredi | 7909b1c | 2010-07-12 14:41:40 +0200 | [diff] [blame^] | 538 | kunmap(buf->page); |
Miklos Szeredi | c302162 | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 539 | buf->len = PAGE_SIZE - cs->len; |
| 540 | } |
Miklos Szeredi | dd3bb14 | 2010-05-25 15:06:06 +0200 | [diff] [blame] | 541 | cs->currbuf = NULL; |
| 542 | cs->mapaddr = NULL; |
| 543 | } else if (cs->mapaddr) { |
Miklos Szeredi | 7909b1c | 2010-07-12 14:41:40 +0200 | [diff] [blame^] | 544 | kunmap(cs->pg); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 545 | if (cs->write) { |
| 546 | flush_dcache_page(cs->pg); |
| 547 | set_page_dirty_lock(cs->pg); |
| 548 | } |
| 549 | put_page(cs->pg); |
| 550 | cs->mapaddr = NULL; |
| 551 | } |
| 552 | } |
| 553 | |
| 554 | /* |
| 555 | * Get another pagefull of userspace buffer, and map it to kernel |
| 556 | * address space, and lock request |
| 557 | */ |
| 558 | static int fuse_copy_fill(struct fuse_copy_state *cs) |
| 559 | { |
| 560 | unsigned long offset; |
| 561 | int err; |
| 562 | |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 563 | unlock_request(cs->fc, cs->req); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 564 | fuse_copy_finish(cs); |
Miklos Szeredi | dd3bb14 | 2010-05-25 15:06:06 +0200 | [diff] [blame] | 565 | if (cs->pipebufs) { |
| 566 | struct pipe_buffer *buf = cs->pipebufs; |
| 567 | |
Miklos Szeredi | c302162 | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 568 | if (!cs->write) { |
| 569 | err = buf->ops->confirm(cs->pipe, buf); |
| 570 | if (err) |
| 571 | return err; |
Miklos Szeredi | dd3bb14 | 2010-05-25 15:06:06 +0200 | [diff] [blame] | 572 | |
Miklos Szeredi | c302162 | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 573 | BUG_ON(!cs->nr_segs); |
| 574 | cs->currbuf = buf; |
Miklos Szeredi | 7909b1c | 2010-07-12 14:41:40 +0200 | [diff] [blame^] | 575 | cs->mapaddr = buf->ops->map(cs->pipe, buf, 0); |
Miklos Szeredi | c302162 | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 576 | cs->len = buf->len; |
| 577 | cs->buf = cs->mapaddr + buf->offset; |
| 578 | cs->pipebufs++; |
| 579 | cs->nr_segs--; |
| 580 | } else { |
| 581 | struct page *page; |
| 582 | |
| 583 | if (cs->nr_segs == cs->pipe->buffers) |
| 584 | return -EIO; |
| 585 | |
| 586 | page = alloc_page(GFP_HIGHUSER); |
| 587 | if (!page) |
| 588 | return -ENOMEM; |
| 589 | |
| 590 | buf->page = page; |
| 591 | buf->offset = 0; |
| 592 | buf->len = 0; |
| 593 | |
| 594 | cs->currbuf = buf; |
Miklos Szeredi | 7909b1c | 2010-07-12 14:41:40 +0200 | [diff] [blame^] | 595 | cs->mapaddr = kmap(page); |
Miklos Szeredi | c302162 | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 596 | cs->buf = cs->mapaddr; |
| 597 | cs->len = PAGE_SIZE; |
| 598 | cs->pipebufs++; |
| 599 | cs->nr_segs++; |
| 600 | } |
Miklos Szeredi | dd3bb14 | 2010-05-25 15:06:06 +0200 | [diff] [blame] | 601 | } else { |
| 602 | if (!cs->seglen) { |
| 603 | BUG_ON(!cs->nr_segs); |
| 604 | cs->seglen = cs->iov[0].iov_len; |
| 605 | cs->addr = (unsigned long) cs->iov[0].iov_base; |
| 606 | cs->iov++; |
| 607 | cs->nr_segs--; |
| 608 | } |
| 609 | err = get_user_pages_fast(cs->addr, 1, cs->write, &cs->pg); |
| 610 | if (err < 0) |
| 611 | return err; |
| 612 | BUG_ON(err != 1); |
| 613 | offset = cs->addr % PAGE_SIZE; |
Miklos Szeredi | 7909b1c | 2010-07-12 14:41:40 +0200 | [diff] [blame^] | 614 | cs->mapaddr = kmap(cs->pg); |
Miklos Szeredi | dd3bb14 | 2010-05-25 15:06:06 +0200 | [diff] [blame] | 615 | cs->buf = cs->mapaddr + offset; |
| 616 | cs->len = min(PAGE_SIZE - offset, cs->seglen); |
| 617 | cs->seglen -= cs->len; |
| 618 | cs->addr += cs->len; |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 619 | } |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 620 | |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 621 | return lock_request(cs->fc, cs->req); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 622 | } |
| 623 | |
| 624 | /* Do as much copy to/from userspace buffer as we can */ |
Miklos Szeredi | 8bfc016 | 2006-01-16 22:14:28 -0800 | [diff] [blame] | 625 | static int fuse_copy_do(struct fuse_copy_state *cs, void **val, unsigned *size) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 626 | { |
| 627 | unsigned ncpy = min(*size, cs->len); |
| 628 | if (val) { |
| 629 | if (cs->write) |
| 630 | memcpy(cs->buf, *val, ncpy); |
| 631 | else |
| 632 | memcpy(*val, cs->buf, ncpy); |
| 633 | *val += ncpy; |
| 634 | } |
| 635 | *size -= ncpy; |
| 636 | cs->len -= ncpy; |
| 637 | cs->buf += ncpy; |
| 638 | return ncpy; |
| 639 | } |
| 640 | |
Miklos Szeredi | ce534fb | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 641 | static int fuse_check_page(struct page *page) |
| 642 | { |
| 643 | if (page_mapcount(page) || |
| 644 | page->mapping != NULL || |
| 645 | page_count(page) != 1 || |
| 646 | (page->flags & PAGE_FLAGS_CHECK_AT_PREP & |
| 647 | ~(1 << PG_locked | |
| 648 | 1 << PG_referenced | |
| 649 | 1 << PG_uptodate | |
| 650 | 1 << PG_lru | |
| 651 | 1 << PG_active | |
| 652 | 1 << PG_reclaim))) { |
| 653 | printk(KERN_WARNING "fuse: trying to steal weird page\n"); |
| 654 | printk(KERN_WARNING " page=%p index=%li flags=%08lx, count=%i, mapcount=%i, mapping=%p\n", page, page->index, page->flags, page_count(page), page_mapcount(page), page->mapping); |
| 655 | return 1; |
| 656 | } |
| 657 | return 0; |
| 658 | } |
| 659 | |
| 660 | static int fuse_try_move_page(struct fuse_copy_state *cs, struct page **pagep) |
| 661 | { |
| 662 | int err; |
| 663 | struct page *oldpage = *pagep; |
| 664 | struct page *newpage; |
| 665 | struct pipe_buffer *buf = cs->pipebufs; |
| 666 | struct address_space *mapping; |
| 667 | pgoff_t index; |
| 668 | |
| 669 | unlock_request(cs->fc, cs->req); |
| 670 | fuse_copy_finish(cs); |
| 671 | |
| 672 | err = buf->ops->confirm(cs->pipe, buf); |
| 673 | if (err) |
| 674 | return err; |
| 675 | |
| 676 | BUG_ON(!cs->nr_segs); |
| 677 | cs->currbuf = buf; |
| 678 | cs->len = buf->len; |
| 679 | cs->pipebufs++; |
| 680 | cs->nr_segs--; |
| 681 | |
| 682 | if (cs->len != PAGE_SIZE) |
| 683 | goto out_fallback; |
| 684 | |
| 685 | if (buf->ops->steal(cs->pipe, buf) != 0) |
| 686 | goto out_fallback; |
| 687 | |
| 688 | newpage = buf->page; |
| 689 | |
| 690 | if (WARN_ON(!PageUptodate(newpage))) |
| 691 | return -EIO; |
| 692 | |
| 693 | ClearPageMappedToDisk(newpage); |
| 694 | |
| 695 | if (fuse_check_page(newpage) != 0) |
| 696 | goto out_fallback_unlock; |
| 697 | |
| 698 | mapping = oldpage->mapping; |
| 699 | index = oldpage->index; |
| 700 | |
| 701 | /* |
| 702 | * This is a new and locked page, it shouldn't be mapped or |
| 703 | * have any special flags on it |
| 704 | */ |
| 705 | if (WARN_ON(page_mapped(oldpage))) |
| 706 | goto out_fallback_unlock; |
| 707 | if (WARN_ON(page_has_private(oldpage))) |
| 708 | goto out_fallback_unlock; |
| 709 | if (WARN_ON(PageDirty(oldpage) || PageWriteback(oldpage))) |
| 710 | goto out_fallback_unlock; |
| 711 | if (WARN_ON(PageMlocked(oldpage))) |
| 712 | goto out_fallback_unlock; |
| 713 | |
| 714 | remove_from_page_cache(oldpage); |
| 715 | page_cache_release(oldpage); |
| 716 | |
| 717 | err = add_to_page_cache_locked(newpage, mapping, index, GFP_KERNEL); |
| 718 | if (err) { |
| 719 | printk(KERN_WARNING "fuse_try_move_page: failed to add page"); |
| 720 | goto out_fallback_unlock; |
| 721 | } |
| 722 | page_cache_get(newpage); |
| 723 | |
| 724 | if (!(buf->flags & PIPE_BUF_FLAG_LRU)) |
| 725 | lru_cache_add_file(newpage); |
| 726 | |
| 727 | err = 0; |
| 728 | spin_lock(&cs->fc->lock); |
| 729 | if (cs->req->aborted) |
| 730 | err = -ENOENT; |
| 731 | else |
| 732 | *pagep = newpage; |
| 733 | spin_unlock(&cs->fc->lock); |
| 734 | |
| 735 | if (err) { |
| 736 | unlock_page(newpage); |
| 737 | page_cache_release(newpage); |
| 738 | return err; |
| 739 | } |
| 740 | |
| 741 | unlock_page(oldpage); |
| 742 | page_cache_release(oldpage); |
| 743 | cs->len = 0; |
| 744 | |
| 745 | return 0; |
| 746 | |
| 747 | out_fallback_unlock: |
| 748 | unlock_page(newpage); |
| 749 | out_fallback: |
| 750 | cs->mapaddr = buf->ops->map(cs->pipe, buf, 1); |
| 751 | cs->buf = cs->mapaddr + buf->offset; |
| 752 | |
| 753 | err = lock_request(cs->fc, cs->req); |
| 754 | if (err) |
| 755 | return err; |
| 756 | |
| 757 | return 1; |
| 758 | } |
| 759 | |
Miklos Szeredi | c302162 | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 760 | static int fuse_ref_page(struct fuse_copy_state *cs, struct page *page, |
| 761 | unsigned offset, unsigned count) |
| 762 | { |
| 763 | struct pipe_buffer *buf; |
| 764 | |
| 765 | if (cs->nr_segs == cs->pipe->buffers) |
| 766 | return -EIO; |
| 767 | |
| 768 | unlock_request(cs->fc, cs->req); |
| 769 | fuse_copy_finish(cs); |
| 770 | |
| 771 | buf = cs->pipebufs; |
| 772 | page_cache_get(page); |
| 773 | buf->page = page; |
| 774 | buf->offset = offset; |
| 775 | buf->len = count; |
| 776 | |
| 777 | cs->pipebufs++; |
| 778 | cs->nr_segs++; |
| 779 | cs->len = 0; |
| 780 | |
| 781 | return 0; |
| 782 | } |
| 783 | |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 784 | /* |
| 785 | * Copy a page in the request to/from the userspace buffer. Must be |
| 786 | * done atomically |
| 787 | */ |
Miklos Szeredi | ce534fb | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 788 | static int fuse_copy_page(struct fuse_copy_state *cs, struct page **pagep, |
Miklos Szeredi | 8bfc016 | 2006-01-16 22:14:28 -0800 | [diff] [blame] | 789 | unsigned offset, unsigned count, int zeroing) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 790 | { |
Miklos Szeredi | ce534fb | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 791 | int err; |
| 792 | struct page *page = *pagep; |
| 793 | |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 794 | if (page && zeroing && count < PAGE_SIZE) { |
| 795 | void *mapaddr = kmap_atomic(page, KM_USER1); |
| 796 | memset(mapaddr, 0, PAGE_SIZE); |
| 797 | kunmap_atomic(mapaddr, KM_USER1); |
| 798 | } |
| 799 | while (count) { |
Miklos Szeredi | c302162 | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 800 | if (cs->write && cs->pipebufs && page) { |
| 801 | return fuse_ref_page(cs, page, offset, count); |
| 802 | } else if (!cs->len) { |
Miklos Szeredi | ce534fb | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 803 | if (cs->move_pages && page && |
| 804 | offset == 0 && count == PAGE_SIZE) { |
| 805 | err = fuse_try_move_page(cs, pagep); |
| 806 | if (err <= 0) |
| 807 | return err; |
| 808 | } else { |
| 809 | err = fuse_copy_fill(cs); |
| 810 | if (err) |
| 811 | return err; |
| 812 | } |
Miklos Szeredi | 1729a16 | 2008-11-26 12:03:54 +0100 | [diff] [blame] | 813 | } |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 814 | if (page) { |
| 815 | void *mapaddr = kmap_atomic(page, KM_USER1); |
| 816 | void *buf = mapaddr + offset; |
| 817 | offset += fuse_copy_do(cs, &buf, &count); |
| 818 | kunmap_atomic(mapaddr, KM_USER1); |
| 819 | } else |
| 820 | offset += fuse_copy_do(cs, NULL, &count); |
| 821 | } |
| 822 | if (page && !cs->write) |
| 823 | flush_dcache_page(page); |
| 824 | return 0; |
| 825 | } |
| 826 | |
| 827 | /* Copy pages in the request to/from userspace buffer */ |
| 828 | static int fuse_copy_pages(struct fuse_copy_state *cs, unsigned nbytes, |
| 829 | int zeroing) |
| 830 | { |
| 831 | unsigned i; |
| 832 | struct fuse_req *req = cs->req; |
| 833 | unsigned offset = req->page_offset; |
| 834 | unsigned count = min(nbytes, (unsigned) PAGE_SIZE - offset); |
| 835 | |
| 836 | for (i = 0; i < req->num_pages && (nbytes || zeroing); i++) { |
Miklos Szeredi | ce534fb | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 837 | int err; |
| 838 | |
| 839 | err = fuse_copy_page(cs, &req->pages[i], offset, count, |
| 840 | zeroing); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 841 | if (err) |
| 842 | return err; |
| 843 | |
| 844 | nbytes -= count; |
| 845 | count = min(nbytes, (unsigned) PAGE_SIZE); |
| 846 | offset = 0; |
| 847 | } |
| 848 | return 0; |
| 849 | } |
| 850 | |
| 851 | /* Copy a single argument in the request to/from userspace buffer */ |
| 852 | static int fuse_copy_one(struct fuse_copy_state *cs, void *val, unsigned size) |
| 853 | { |
| 854 | while (size) { |
Miklos Szeredi | 1729a16 | 2008-11-26 12:03:54 +0100 | [diff] [blame] | 855 | if (!cs->len) { |
| 856 | int err = fuse_copy_fill(cs); |
| 857 | if (err) |
| 858 | return err; |
| 859 | } |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 860 | fuse_copy_do(cs, &val, &size); |
| 861 | } |
| 862 | return 0; |
| 863 | } |
| 864 | |
| 865 | /* Copy request arguments to/from userspace buffer */ |
| 866 | static int fuse_copy_args(struct fuse_copy_state *cs, unsigned numargs, |
| 867 | unsigned argpages, struct fuse_arg *args, |
| 868 | int zeroing) |
| 869 | { |
| 870 | int err = 0; |
| 871 | unsigned i; |
| 872 | |
| 873 | for (i = 0; !err && i < numargs; i++) { |
| 874 | struct fuse_arg *arg = &args[i]; |
| 875 | if (i == numargs - 1 && argpages) |
| 876 | err = fuse_copy_pages(cs, arg->size, zeroing); |
| 877 | else |
| 878 | err = fuse_copy_one(cs, arg->value, arg->size); |
| 879 | } |
| 880 | return err; |
| 881 | } |
| 882 | |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 883 | static int request_pending(struct fuse_conn *fc) |
| 884 | { |
| 885 | return !list_empty(&fc->pending) || !list_empty(&fc->interrupts); |
| 886 | } |
| 887 | |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 888 | /* Wait until a request is available on the pending list */ |
| 889 | static void request_wait(struct fuse_conn *fc) |
Harvey Harrison | 5d9ec85 | 2008-12-02 14:49:42 +0100 | [diff] [blame] | 890 | __releases(&fc->lock) |
| 891 | __acquires(&fc->lock) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 892 | { |
| 893 | DECLARE_WAITQUEUE(wait, current); |
| 894 | |
| 895 | add_wait_queue_exclusive(&fc->waitq, &wait); |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 896 | while (fc->connected && !request_pending(fc)) { |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 897 | set_current_state(TASK_INTERRUPTIBLE); |
| 898 | if (signal_pending(current)) |
| 899 | break; |
| 900 | |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 901 | spin_unlock(&fc->lock); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 902 | schedule(); |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 903 | spin_lock(&fc->lock); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 904 | } |
| 905 | set_current_state(TASK_RUNNING); |
| 906 | remove_wait_queue(&fc->waitq, &wait); |
| 907 | } |
| 908 | |
| 909 | /* |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 910 | * Transfer an interrupt request to userspace |
| 911 | * |
| 912 | * Unlike other requests this is assembled on demand, without a need |
| 913 | * to allocate a separate fuse_req structure. |
| 914 | * |
| 915 | * Called with fc->lock held, releases it |
| 916 | */ |
Miklos Szeredi | c302162 | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 917 | static int fuse_read_interrupt(struct fuse_conn *fc, struct fuse_copy_state *cs, |
| 918 | size_t nbytes, struct fuse_req *req) |
Harvey Harrison | 5d9ec85 | 2008-12-02 14:49:42 +0100 | [diff] [blame] | 919 | __releases(&fc->lock) |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 920 | { |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 921 | struct fuse_in_header ih; |
| 922 | struct fuse_interrupt_in arg; |
| 923 | unsigned reqsize = sizeof(ih) + sizeof(arg); |
| 924 | int err; |
| 925 | |
| 926 | list_del_init(&req->intr_entry); |
| 927 | req->intr_unique = fuse_get_unique(fc); |
| 928 | memset(&ih, 0, sizeof(ih)); |
| 929 | memset(&arg, 0, sizeof(arg)); |
| 930 | ih.len = reqsize; |
| 931 | ih.opcode = FUSE_INTERRUPT; |
| 932 | ih.unique = req->intr_unique; |
| 933 | arg.unique = req->in.h.unique; |
| 934 | |
| 935 | spin_unlock(&fc->lock); |
Miklos Szeredi | c302162 | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 936 | if (nbytes < reqsize) |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 937 | return -EINVAL; |
| 938 | |
Miklos Szeredi | c302162 | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 939 | err = fuse_copy_one(cs, &ih, sizeof(ih)); |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 940 | if (!err) |
Miklos Szeredi | c302162 | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 941 | err = fuse_copy_one(cs, &arg, sizeof(arg)); |
| 942 | fuse_copy_finish(cs); |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 943 | |
| 944 | return err ? err : reqsize; |
| 945 | } |
| 946 | |
| 947 | /* |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 948 | * Read a single request into the userspace filesystem's buffer. This |
| 949 | * function waits until a request is available, then removes it from |
| 950 | * the pending list and copies request data to userspace buffer. If |
Miklos Szeredi | f9a2842 | 2006-06-25 05:48:53 -0700 | [diff] [blame] | 951 | * no reply is needed (FORGET) or request has been aborted or there |
| 952 | * was an error during the copying then it's finished by calling |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 953 | * request_end(). Otherwise add it to the processing list, and set |
| 954 | * the 'sent' flag. |
| 955 | */ |
Miklos Szeredi | c302162 | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 956 | static ssize_t fuse_dev_do_read(struct fuse_conn *fc, struct file *file, |
| 957 | struct fuse_copy_state *cs, size_t nbytes) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 958 | { |
| 959 | int err; |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 960 | struct fuse_req *req; |
| 961 | struct fuse_in *in; |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 962 | unsigned reqsize; |
| 963 | |
Miklos Szeredi | 1d3d752 | 2006-01-06 00:19:40 -0800 | [diff] [blame] | 964 | restart: |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 965 | spin_lock(&fc->lock); |
Jeff Dike | e5ac1d1 | 2006-04-10 22:54:53 -0700 | [diff] [blame] | 966 | err = -EAGAIN; |
| 967 | if ((file->f_flags & O_NONBLOCK) && fc->connected && |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 968 | !request_pending(fc)) |
Jeff Dike | e5ac1d1 | 2006-04-10 22:54:53 -0700 | [diff] [blame] | 969 | goto err_unlock; |
| 970 | |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 971 | request_wait(fc); |
| 972 | err = -ENODEV; |
Miklos Szeredi | 9ba7cbb | 2006-01-16 22:14:34 -0800 | [diff] [blame] | 973 | if (!fc->connected) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 974 | goto err_unlock; |
| 975 | err = -ERESTARTSYS; |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 976 | if (!request_pending(fc)) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 977 | goto err_unlock; |
| 978 | |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 979 | if (!list_empty(&fc->interrupts)) { |
| 980 | req = list_entry(fc->interrupts.next, struct fuse_req, |
| 981 | intr_entry); |
Miklos Szeredi | c302162 | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 982 | return fuse_read_interrupt(fc, cs, nbytes, req); |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 983 | } |
| 984 | |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 985 | req = list_entry(fc->pending.next, struct fuse_req, list); |
Miklos Szeredi | 83cfd49 | 2006-01-16 22:14:31 -0800 | [diff] [blame] | 986 | req->state = FUSE_REQ_READING; |
Miklos Szeredi | d77a1d5 | 2006-01-16 22:14:31 -0800 | [diff] [blame] | 987 | list_move(&req->list, &fc->io); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 988 | |
| 989 | in = &req->in; |
Miklos Szeredi | 1d3d752 | 2006-01-06 00:19:40 -0800 | [diff] [blame] | 990 | reqsize = in->h.len; |
| 991 | /* If request is too large, reply with an error and restart the read */ |
Miklos Szeredi | c302162 | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 992 | if (nbytes < reqsize) { |
Miklos Szeredi | 1d3d752 | 2006-01-06 00:19:40 -0800 | [diff] [blame] | 993 | req->out.h.error = -EIO; |
| 994 | /* SETXATTR is special, since it may contain too large data */ |
| 995 | if (in->h.opcode == FUSE_SETXATTR) |
| 996 | req->out.h.error = -E2BIG; |
| 997 | request_end(fc, req); |
| 998 | goto restart; |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 999 | } |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 1000 | spin_unlock(&fc->lock); |
Miklos Szeredi | c302162 | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 1001 | cs->req = req; |
| 1002 | err = fuse_copy_one(cs, &in->h, sizeof(in->h)); |
Miklos Szeredi | 1d3d752 | 2006-01-06 00:19:40 -0800 | [diff] [blame] | 1003 | if (!err) |
Miklos Szeredi | c302162 | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 1004 | err = fuse_copy_args(cs, in->numargs, in->argpages, |
Miklos Szeredi | 1d3d752 | 2006-01-06 00:19:40 -0800 | [diff] [blame] | 1005 | (struct fuse_arg *) in->args, 0); |
Miklos Szeredi | c302162 | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 1006 | fuse_copy_finish(cs); |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 1007 | spin_lock(&fc->lock); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1008 | req->locked = 0; |
Miklos Szeredi | c9c9d7d | 2007-10-16 23:31:05 -0700 | [diff] [blame] | 1009 | if (req->aborted) { |
| 1010 | request_end(fc, req); |
| 1011 | return -ENODEV; |
| 1012 | } |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1013 | if (err) { |
Miklos Szeredi | c9c9d7d | 2007-10-16 23:31:05 -0700 | [diff] [blame] | 1014 | req->out.h.error = -EIO; |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1015 | request_end(fc, req); |
| 1016 | return err; |
| 1017 | } |
| 1018 | if (!req->isreply) |
| 1019 | request_end(fc, req); |
| 1020 | else { |
Miklos Szeredi | 83cfd49 | 2006-01-16 22:14:31 -0800 | [diff] [blame] | 1021 | req->state = FUSE_REQ_SENT; |
Miklos Szeredi | d77a1d5 | 2006-01-16 22:14:31 -0800 | [diff] [blame] | 1022 | list_move_tail(&req->list, &fc->processing); |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 1023 | if (req->interrupted) |
| 1024 | queue_interrupt(fc, req); |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 1025 | spin_unlock(&fc->lock); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1026 | } |
| 1027 | return reqsize; |
| 1028 | |
| 1029 | err_unlock: |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 1030 | spin_unlock(&fc->lock); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1031 | return err; |
| 1032 | } |
| 1033 | |
Miklos Szeredi | c302162 | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 1034 | static ssize_t fuse_dev_read(struct kiocb *iocb, const struct iovec *iov, |
| 1035 | unsigned long nr_segs, loff_t pos) |
| 1036 | { |
| 1037 | struct fuse_copy_state cs; |
| 1038 | struct file *file = iocb->ki_filp; |
| 1039 | struct fuse_conn *fc = fuse_get_conn(file); |
| 1040 | if (!fc) |
| 1041 | return -EPERM; |
| 1042 | |
| 1043 | fuse_copy_init(&cs, fc, 1, iov, nr_segs); |
| 1044 | |
| 1045 | return fuse_dev_do_read(fc, file, &cs, iov_length(iov, nr_segs)); |
| 1046 | } |
| 1047 | |
| 1048 | static int fuse_dev_pipe_buf_steal(struct pipe_inode_info *pipe, |
| 1049 | struct pipe_buffer *buf) |
| 1050 | { |
| 1051 | return 1; |
| 1052 | } |
| 1053 | |
| 1054 | static const struct pipe_buf_operations fuse_dev_pipe_buf_ops = { |
| 1055 | .can_merge = 0, |
| 1056 | .map = generic_pipe_buf_map, |
| 1057 | .unmap = generic_pipe_buf_unmap, |
| 1058 | .confirm = generic_pipe_buf_confirm, |
| 1059 | .release = generic_pipe_buf_release, |
| 1060 | .steal = fuse_dev_pipe_buf_steal, |
| 1061 | .get = generic_pipe_buf_get, |
| 1062 | }; |
| 1063 | |
| 1064 | static ssize_t fuse_dev_splice_read(struct file *in, loff_t *ppos, |
| 1065 | struct pipe_inode_info *pipe, |
| 1066 | size_t len, unsigned int flags) |
| 1067 | { |
| 1068 | int ret; |
| 1069 | int page_nr = 0; |
| 1070 | int do_wakeup = 0; |
| 1071 | struct pipe_buffer *bufs; |
| 1072 | struct fuse_copy_state cs; |
| 1073 | struct fuse_conn *fc = fuse_get_conn(in); |
| 1074 | if (!fc) |
| 1075 | return -EPERM; |
| 1076 | |
| 1077 | bufs = kmalloc(pipe->buffers * sizeof (struct pipe_buffer), GFP_KERNEL); |
| 1078 | if (!bufs) |
| 1079 | return -ENOMEM; |
| 1080 | |
| 1081 | fuse_copy_init(&cs, fc, 1, NULL, 0); |
| 1082 | cs.pipebufs = bufs; |
| 1083 | cs.pipe = pipe; |
| 1084 | ret = fuse_dev_do_read(fc, in, &cs, len); |
| 1085 | if (ret < 0) |
| 1086 | goto out; |
| 1087 | |
| 1088 | ret = 0; |
| 1089 | pipe_lock(pipe); |
| 1090 | |
| 1091 | if (!pipe->readers) { |
| 1092 | send_sig(SIGPIPE, current, 0); |
| 1093 | if (!ret) |
| 1094 | ret = -EPIPE; |
| 1095 | goto out_unlock; |
| 1096 | } |
| 1097 | |
| 1098 | if (pipe->nrbufs + cs.nr_segs > pipe->buffers) { |
| 1099 | ret = -EIO; |
| 1100 | goto out_unlock; |
| 1101 | } |
| 1102 | |
| 1103 | while (page_nr < cs.nr_segs) { |
| 1104 | int newbuf = (pipe->curbuf + pipe->nrbufs) & (pipe->buffers - 1); |
| 1105 | struct pipe_buffer *buf = pipe->bufs + newbuf; |
| 1106 | |
| 1107 | buf->page = bufs[page_nr].page; |
| 1108 | buf->offset = bufs[page_nr].offset; |
| 1109 | buf->len = bufs[page_nr].len; |
| 1110 | buf->ops = &fuse_dev_pipe_buf_ops; |
| 1111 | |
| 1112 | pipe->nrbufs++; |
| 1113 | page_nr++; |
| 1114 | ret += buf->len; |
| 1115 | |
| 1116 | if (pipe->inode) |
| 1117 | do_wakeup = 1; |
| 1118 | } |
| 1119 | |
| 1120 | out_unlock: |
| 1121 | pipe_unlock(pipe); |
| 1122 | |
| 1123 | if (do_wakeup) { |
| 1124 | smp_mb(); |
| 1125 | if (waitqueue_active(&pipe->wait)) |
| 1126 | wake_up_interruptible(&pipe->wait); |
| 1127 | kill_fasync(&pipe->fasync_readers, SIGIO, POLL_IN); |
| 1128 | } |
| 1129 | |
| 1130 | out: |
| 1131 | for (; page_nr < cs.nr_segs; page_nr++) |
| 1132 | page_cache_release(bufs[page_nr].page); |
| 1133 | |
| 1134 | kfree(bufs); |
| 1135 | return ret; |
| 1136 | } |
| 1137 | |
Tejun Heo | 95668a6 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 1138 | static int fuse_notify_poll(struct fuse_conn *fc, unsigned int size, |
| 1139 | struct fuse_copy_state *cs) |
| 1140 | { |
| 1141 | struct fuse_notify_poll_wakeup_out outarg; |
Miklos Szeredi | f6d47a1 | 2009-01-26 15:00:59 +0100 | [diff] [blame] | 1142 | int err = -EINVAL; |
Tejun Heo | 95668a6 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 1143 | |
| 1144 | if (size != sizeof(outarg)) |
Miklos Szeredi | f6d47a1 | 2009-01-26 15:00:59 +0100 | [diff] [blame] | 1145 | goto err; |
Tejun Heo | 95668a6 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 1146 | |
| 1147 | err = fuse_copy_one(cs, &outarg, sizeof(outarg)); |
| 1148 | if (err) |
Miklos Szeredi | f6d47a1 | 2009-01-26 15:00:59 +0100 | [diff] [blame] | 1149 | goto err; |
Tejun Heo | 95668a6 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 1150 | |
Miklos Szeredi | f6d47a1 | 2009-01-26 15:00:59 +0100 | [diff] [blame] | 1151 | fuse_copy_finish(cs); |
Tejun Heo | 95668a6 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 1152 | return fuse_notify_poll_wakeup(fc, &outarg); |
Miklos Szeredi | f6d47a1 | 2009-01-26 15:00:59 +0100 | [diff] [blame] | 1153 | |
| 1154 | err: |
| 1155 | fuse_copy_finish(cs); |
| 1156 | return err; |
Tejun Heo | 95668a6 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 1157 | } |
| 1158 | |
John Muir | 3b463ae | 2009-05-31 11:13:57 -0400 | [diff] [blame] | 1159 | static int fuse_notify_inval_inode(struct fuse_conn *fc, unsigned int size, |
| 1160 | struct fuse_copy_state *cs) |
| 1161 | { |
| 1162 | struct fuse_notify_inval_inode_out outarg; |
| 1163 | int err = -EINVAL; |
| 1164 | |
| 1165 | if (size != sizeof(outarg)) |
| 1166 | goto err; |
| 1167 | |
| 1168 | err = fuse_copy_one(cs, &outarg, sizeof(outarg)); |
| 1169 | if (err) |
| 1170 | goto err; |
| 1171 | fuse_copy_finish(cs); |
| 1172 | |
| 1173 | down_read(&fc->killsb); |
| 1174 | err = -ENOENT; |
Miklos Szeredi | b21dda4 | 2010-02-05 12:08:31 +0100 | [diff] [blame] | 1175 | if (fc->sb) { |
| 1176 | err = fuse_reverse_inval_inode(fc->sb, outarg.ino, |
| 1177 | outarg.off, outarg.len); |
| 1178 | } |
John Muir | 3b463ae | 2009-05-31 11:13:57 -0400 | [diff] [blame] | 1179 | up_read(&fc->killsb); |
| 1180 | return err; |
| 1181 | |
| 1182 | err: |
| 1183 | fuse_copy_finish(cs); |
| 1184 | return err; |
| 1185 | } |
| 1186 | |
| 1187 | static int fuse_notify_inval_entry(struct fuse_conn *fc, unsigned int size, |
| 1188 | struct fuse_copy_state *cs) |
| 1189 | { |
| 1190 | struct fuse_notify_inval_entry_out outarg; |
Fang Wenqi | b2d82ee | 2009-12-30 18:37:13 +0800 | [diff] [blame] | 1191 | int err = -ENOMEM; |
| 1192 | char *buf; |
John Muir | 3b463ae | 2009-05-31 11:13:57 -0400 | [diff] [blame] | 1193 | struct qstr name; |
| 1194 | |
Fang Wenqi | b2d82ee | 2009-12-30 18:37:13 +0800 | [diff] [blame] | 1195 | buf = kzalloc(FUSE_NAME_MAX + 1, GFP_KERNEL); |
| 1196 | if (!buf) |
| 1197 | goto err; |
| 1198 | |
| 1199 | err = -EINVAL; |
John Muir | 3b463ae | 2009-05-31 11:13:57 -0400 | [diff] [blame] | 1200 | if (size < sizeof(outarg)) |
| 1201 | goto err; |
| 1202 | |
| 1203 | err = fuse_copy_one(cs, &outarg, sizeof(outarg)); |
| 1204 | if (err) |
| 1205 | goto err; |
| 1206 | |
| 1207 | err = -ENAMETOOLONG; |
| 1208 | if (outarg.namelen > FUSE_NAME_MAX) |
| 1209 | goto err; |
| 1210 | |
| 1211 | name.name = buf; |
| 1212 | name.len = outarg.namelen; |
| 1213 | err = fuse_copy_one(cs, buf, outarg.namelen + 1); |
| 1214 | if (err) |
| 1215 | goto err; |
| 1216 | fuse_copy_finish(cs); |
| 1217 | buf[outarg.namelen] = 0; |
| 1218 | name.hash = full_name_hash(name.name, name.len); |
| 1219 | |
| 1220 | down_read(&fc->killsb); |
| 1221 | err = -ENOENT; |
Miklos Szeredi | b21dda4 | 2010-02-05 12:08:31 +0100 | [diff] [blame] | 1222 | if (fc->sb) |
| 1223 | err = fuse_reverse_inval_entry(fc->sb, outarg.parent, &name); |
John Muir | 3b463ae | 2009-05-31 11:13:57 -0400 | [diff] [blame] | 1224 | up_read(&fc->killsb); |
Fang Wenqi | b2d82ee | 2009-12-30 18:37:13 +0800 | [diff] [blame] | 1225 | kfree(buf); |
John Muir | 3b463ae | 2009-05-31 11:13:57 -0400 | [diff] [blame] | 1226 | return err; |
| 1227 | |
| 1228 | err: |
Fang Wenqi | b2d82ee | 2009-12-30 18:37:13 +0800 | [diff] [blame] | 1229 | kfree(buf); |
John Muir | 3b463ae | 2009-05-31 11:13:57 -0400 | [diff] [blame] | 1230 | fuse_copy_finish(cs); |
| 1231 | return err; |
| 1232 | } |
| 1233 | |
Tejun Heo | 8599396 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 1234 | static int fuse_notify(struct fuse_conn *fc, enum fuse_notify_code code, |
| 1235 | unsigned int size, struct fuse_copy_state *cs) |
| 1236 | { |
| 1237 | switch (code) { |
Tejun Heo | 95668a6 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 1238 | case FUSE_NOTIFY_POLL: |
| 1239 | return fuse_notify_poll(fc, size, cs); |
| 1240 | |
John Muir | 3b463ae | 2009-05-31 11:13:57 -0400 | [diff] [blame] | 1241 | case FUSE_NOTIFY_INVAL_INODE: |
| 1242 | return fuse_notify_inval_inode(fc, size, cs); |
| 1243 | |
| 1244 | case FUSE_NOTIFY_INVAL_ENTRY: |
| 1245 | return fuse_notify_inval_entry(fc, size, cs); |
| 1246 | |
Tejun Heo | 8599396 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 1247 | default: |
Miklos Szeredi | f6d47a1 | 2009-01-26 15:00:59 +0100 | [diff] [blame] | 1248 | fuse_copy_finish(cs); |
Tejun Heo | 8599396 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 1249 | return -EINVAL; |
| 1250 | } |
| 1251 | } |
| 1252 | |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1253 | /* Look up request on processing list by unique ID */ |
| 1254 | static struct fuse_req *request_find(struct fuse_conn *fc, u64 unique) |
| 1255 | { |
| 1256 | struct list_head *entry; |
| 1257 | |
| 1258 | list_for_each(entry, &fc->processing) { |
| 1259 | struct fuse_req *req; |
| 1260 | req = list_entry(entry, struct fuse_req, list); |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 1261 | if (req->in.h.unique == unique || req->intr_unique == unique) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1262 | return req; |
| 1263 | } |
| 1264 | return NULL; |
| 1265 | } |
| 1266 | |
| 1267 | static int copy_out_args(struct fuse_copy_state *cs, struct fuse_out *out, |
| 1268 | unsigned nbytes) |
| 1269 | { |
| 1270 | unsigned reqsize = sizeof(struct fuse_out_header); |
| 1271 | |
| 1272 | if (out->h.error) |
| 1273 | return nbytes != reqsize ? -EINVAL : 0; |
| 1274 | |
| 1275 | reqsize += len_args(out->numargs, out->args); |
| 1276 | |
| 1277 | if (reqsize < nbytes || (reqsize > nbytes && !out->argvar)) |
| 1278 | return -EINVAL; |
| 1279 | else if (reqsize > nbytes) { |
| 1280 | struct fuse_arg *lastarg = &out->args[out->numargs-1]; |
| 1281 | unsigned diffsize = reqsize - nbytes; |
| 1282 | if (diffsize > lastarg->size) |
| 1283 | return -EINVAL; |
| 1284 | lastarg->size -= diffsize; |
| 1285 | } |
| 1286 | return fuse_copy_args(cs, out->numargs, out->argpages, out->args, |
| 1287 | out->page_zeroing); |
| 1288 | } |
| 1289 | |
| 1290 | /* |
| 1291 | * Write a single reply to a request. First the header is copied from |
| 1292 | * the write buffer. The request is then searched on the processing |
| 1293 | * list by the unique ID found in the header. If found, then remove |
| 1294 | * it from the list and copy the rest of the buffer to the request. |
| 1295 | * The request is finished by calling request_end() |
| 1296 | */ |
Miklos Szeredi | dd3bb14 | 2010-05-25 15:06:06 +0200 | [diff] [blame] | 1297 | static ssize_t fuse_dev_do_write(struct fuse_conn *fc, |
| 1298 | struct fuse_copy_state *cs, size_t nbytes) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1299 | { |
| 1300 | int err; |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1301 | struct fuse_req *req; |
| 1302 | struct fuse_out_header oh; |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1303 | |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1304 | if (nbytes < sizeof(struct fuse_out_header)) |
| 1305 | return -EINVAL; |
| 1306 | |
Miklos Szeredi | dd3bb14 | 2010-05-25 15:06:06 +0200 | [diff] [blame] | 1307 | err = fuse_copy_one(cs, &oh, sizeof(oh)); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1308 | if (err) |
| 1309 | goto err_finish; |
Tejun Heo | 8599396 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 1310 | |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1311 | err = -EINVAL; |
Tejun Heo | 8599396 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 1312 | if (oh.len != nbytes) |
| 1313 | goto err_finish; |
| 1314 | |
| 1315 | /* |
| 1316 | * Zero oh.unique indicates unsolicited notification message |
| 1317 | * and error contains notification code. |
| 1318 | */ |
| 1319 | if (!oh.unique) { |
Miklos Szeredi | dd3bb14 | 2010-05-25 15:06:06 +0200 | [diff] [blame] | 1320 | err = fuse_notify(fc, oh.error, nbytes - sizeof(oh), cs); |
Tejun Heo | 8599396 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 1321 | return err ? err : nbytes; |
| 1322 | } |
| 1323 | |
| 1324 | err = -EINVAL; |
| 1325 | if (oh.error <= -1000 || oh.error > 0) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1326 | goto err_finish; |
| 1327 | |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 1328 | spin_lock(&fc->lock); |
Miklos Szeredi | 69a53bf | 2006-01-16 22:14:41 -0800 | [diff] [blame] | 1329 | err = -ENOENT; |
| 1330 | if (!fc->connected) |
| 1331 | goto err_unlock; |
| 1332 | |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1333 | req = request_find(fc, oh.unique); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1334 | if (!req) |
| 1335 | goto err_unlock; |
| 1336 | |
Miklos Szeredi | f9a2842 | 2006-06-25 05:48:53 -0700 | [diff] [blame] | 1337 | if (req->aborted) { |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 1338 | spin_unlock(&fc->lock); |
Miklos Szeredi | dd3bb14 | 2010-05-25 15:06:06 +0200 | [diff] [blame] | 1339 | fuse_copy_finish(cs); |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 1340 | spin_lock(&fc->lock); |
Miklos Szeredi | 222f1d69 | 2006-01-16 22:14:25 -0800 | [diff] [blame] | 1341 | request_end(fc, req); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1342 | return -ENOENT; |
| 1343 | } |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 1344 | /* Is it an interrupt reply? */ |
| 1345 | if (req->intr_unique == oh.unique) { |
| 1346 | err = -EINVAL; |
| 1347 | if (nbytes != sizeof(struct fuse_out_header)) |
| 1348 | goto err_unlock; |
| 1349 | |
| 1350 | if (oh.error == -ENOSYS) |
| 1351 | fc->no_interrupt = 1; |
| 1352 | else if (oh.error == -EAGAIN) |
| 1353 | queue_interrupt(fc, req); |
| 1354 | |
| 1355 | spin_unlock(&fc->lock); |
Miklos Szeredi | dd3bb14 | 2010-05-25 15:06:06 +0200 | [diff] [blame] | 1356 | fuse_copy_finish(cs); |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 1357 | return nbytes; |
| 1358 | } |
| 1359 | |
| 1360 | req->state = FUSE_REQ_WRITING; |
Miklos Szeredi | d77a1d5 | 2006-01-16 22:14:31 -0800 | [diff] [blame] | 1361 | list_move(&req->list, &fc->io); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1362 | req->out.h = oh; |
| 1363 | req->locked = 1; |
Miklos Szeredi | dd3bb14 | 2010-05-25 15:06:06 +0200 | [diff] [blame] | 1364 | cs->req = req; |
Miklos Szeredi | ce534fb | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 1365 | if (!req->out.page_replace) |
| 1366 | cs->move_pages = 0; |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 1367 | spin_unlock(&fc->lock); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1368 | |
Miklos Szeredi | dd3bb14 | 2010-05-25 15:06:06 +0200 | [diff] [blame] | 1369 | err = copy_out_args(cs, &req->out, nbytes); |
| 1370 | fuse_copy_finish(cs); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1371 | |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 1372 | spin_lock(&fc->lock); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1373 | req->locked = 0; |
| 1374 | if (!err) { |
Miklos Szeredi | f9a2842 | 2006-06-25 05:48:53 -0700 | [diff] [blame] | 1375 | if (req->aborted) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1376 | err = -ENOENT; |
Miklos Szeredi | f9a2842 | 2006-06-25 05:48:53 -0700 | [diff] [blame] | 1377 | } else if (!req->aborted) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1378 | req->out.h.error = -EIO; |
| 1379 | request_end(fc, req); |
| 1380 | |
| 1381 | return err ? err : nbytes; |
| 1382 | |
| 1383 | err_unlock: |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 1384 | spin_unlock(&fc->lock); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1385 | err_finish: |
Miklos Szeredi | dd3bb14 | 2010-05-25 15:06:06 +0200 | [diff] [blame] | 1386 | fuse_copy_finish(cs); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1387 | return err; |
| 1388 | } |
| 1389 | |
Miklos Szeredi | dd3bb14 | 2010-05-25 15:06:06 +0200 | [diff] [blame] | 1390 | static ssize_t fuse_dev_write(struct kiocb *iocb, const struct iovec *iov, |
| 1391 | unsigned long nr_segs, loff_t pos) |
| 1392 | { |
| 1393 | struct fuse_copy_state cs; |
| 1394 | struct fuse_conn *fc = fuse_get_conn(iocb->ki_filp); |
| 1395 | if (!fc) |
| 1396 | return -EPERM; |
| 1397 | |
Miklos Szeredi | c302162 | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 1398 | fuse_copy_init(&cs, fc, 0, iov, nr_segs); |
Miklos Szeredi | dd3bb14 | 2010-05-25 15:06:06 +0200 | [diff] [blame] | 1399 | |
| 1400 | return fuse_dev_do_write(fc, &cs, iov_length(iov, nr_segs)); |
| 1401 | } |
| 1402 | |
| 1403 | static ssize_t fuse_dev_splice_write(struct pipe_inode_info *pipe, |
| 1404 | struct file *out, loff_t *ppos, |
| 1405 | size_t len, unsigned int flags) |
| 1406 | { |
| 1407 | unsigned nbuf; |
| 1408 | unsigned idx; |
| 1409 | struct pipe_buffer *bufs; |
| 1410 | struct fuse_copy_state cs; |
| 1411 | struct fuse_conn *fc; |
| 1412 | size_t rem; |
| 1413 | ssize_t ret; |
| 1414 | |
| 1415 | fc = fuse_get_conn(out); |
| 1416 | if (!fc) |
| 1417 | return -EPERM; |
| 1418 | |
| 1419 | bufs = kmalloc(pipe->buffers * sizeof (struct pipe_buffer), GFP_KERNEL); |
| 1420 | if (!bufs) |
| 1421 | return -ENOMEM; |
| 1422 | |
| 1423 | pipe_lock(pipe); |
| 1424 | nbuf = 0; |
| 1425 | rem = 0; |
| 1426 | for (idx = 0; idx < pipe->nrbufs && rem < len; idx++) |
| 1427 | rem += pipe->bufs[(pipe->curbuf + idx) & (pipe->buffers - 1)].len; |
| 1428 | |
| 1429 | ret = -EINVAL; |
| 1430 | if (rem < len) { |
| 1431 | pipe_unlock(pipe); |
| 1432 | goto out; |
| 1433 | } |
| 1434 | |
| 1435 | rem = len; |
| 1436 | while (rem) { |
| 1437 | struct pipe_buffer *ibuf; |
| 1438 | struct pipe_buffer *obuf; |
| 1439 | |
| 1440 | BUG_ON(nbuf >= pipe->buffers); |
| 1441 | BUG_ON(!pipe->nrbufs); |
| 1442 | ibuf = &pipe->bufs[pipe->curbuf]; |
| 1443 | obuf = &bufs[nbuf]; |
| 1444 | |
| 1445 | if (rem >= ibuf->len) { |
| 1446 | *obuf = *ibuf; |
| 1447 | ibuf->ops = NULL; |
| 1448 | pipe->curbuf = (pipe->curbuf + 1) & (pipe->buffers - 1); |
| 1449 | pipe->nrbufs--; |
| 1450 | } else { |
| 1451 | ibuf->ops->get(pipe, ibuf); |
| 1452 | *obuf = *ibuf; |
| 1453 | obuf->flags &= ~PIPE_BUF_FLAG_GIFT; |
| 1454 | obuf->len = rem; |
| 1455 | ibuf->offset += obuf->len; |
| 1456 | ibuf->len -= obuf->len; |
| 1457 | } |
| 1458 | nbuf++; |
| 1459 | rem -= obuf->len; |
| 1460 | } |
| 1461 | pipe_unlock(pipe); |
| 1462 | |
Miklos Szeredi | c302162 | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 1463 | fuse_copy_init(&cs, fc, 0, NULL, nbuf); |
Miklos Szeredi | dd3bb14 | 2010-05-25 15:06:06 +0200 | [diff] [blame] | 1464 | cs.pipebufs = bufs; |
Miklos Szeredi | dd3bb14 | 2010-05-25 15:06:06 +0200 | [diff] [blame] | 1465 | cs.pipe = pipe; |
| 1466 | |
Miklos Szeredi | ce534fb | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 1467 | if (flags & SPLICE_F_MOVE) |
| 1468 | cs.move_pages = 1; |
| 1469 | |
Miklos Szeredi | dd3bb14 | 2010-05-25 15:06:06 +0200 | [diff] [blame] | 1470 | ret = fuse_dev_do_write(fc, &cs, len); |
| 1471 | |
| 1472 | for (idx = 0; idx < nbuf; idx++) { |
| 1473 | struct pipe_buffer *buf = &bufs[idx]; |
| 1474 | buf->ops->release(pipe, buf); |
| 1475 | } |
| 1476 | out: |
| 1477 | kfree(bufs); |
| 1478 | return ret; |
| 1479 | } |
| 1480 | |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1481 | static unsigned fuse_dev_poll(struct file *file, poll_table *wait) |
| 1482 | { |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1483 | unsigned mask = POLLOUT | POLLWRNORM; |
Miklos Szeredi | 7025d9a | 2006-04-10 22:54:50 -0700 | [diff] [blame] | 1484 | struct fuse_conn *fc = fuse_get_conn(file); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1485 | if (!fc) |
Miklos Szeredi | 7025d9a | 2006-04-10 22:54:50 -0700 | [diff] [blame] | 1486 | return POLLERR; |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1487 | |
| 1488 | poll_wait(file, &fc->waitq, wait); |
| 1489 | |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 1490 | spin_lock(&fc->lock); |
Miklos Szeredi | 7025d9a | 2006-04-10 22:54:50 -0700 | [diff] [blame] | 1491 | if (!fc->connected) |
| 1492 | mask = POLLERR; |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 1493 | else if (request_pending(fc)) |
Miklos Szeredi | 7025d9a | 2006-04-10 22:54:50 -0700 | [diff] [blame] | 1494 | mask |= POLLIN | POLLRDNORM; |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 1495 | spin_unlock(&fc->lock); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1496 | |
| 1497 | return mask; |
| 1498 | } |
| 1499 | |
Miklos Szeredi | 69a53bf | 2006-01-16 22:14:41 -0800 | [diff] [blame] | 1500 | /* |
| 1501 | * Abort all requests on the given list (pending or processing) |
| 1502 | * |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 1503 | * This function releases and reacquires fc->lock |
Miklos Szeredi | 69a53bf | 2006-01-16 22:14:41 -0800 | [diff] [blame] | 1504 | */ |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1505 | static void end_requests(struct fuse_conn *fc, struct list_head *head) |
Harvey Harrison | 5d9ec85 | 2008-12-02 14:49:42 +0100 | [diff] [blame] | 1506 | __releases(&fc->lock) |
| 1507 | __acquires(&fc->lock) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1508 | { |
| 1509 | while (!list_empty(head)) { |
| 1510 | struct fuse_req *req; |
| 1511 | req = list_entry(head->next, struct fuse_req, list); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1512 | req->out.h.error = -ECONNABORTED; |
| 1513 | request_end(fc, req); |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 1514 | spin_lock(&fc->lock); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1515 | } |
| 1516 | } |
| 1517 | |
Miklos Szeredi | 69a53bf | 2006-01-16 22:14:41 -0800 | [diff] [blame] | 1518 | /* |
| 1519 | * Abort requests under I/O |
| 1520 | * |
Miklos Szeredi | f9a2842 | 2006-06-25 05:48:53 -0700 | [diff] [blame] | 1521 | * The requests are set to aborted and finished, and the request |
Miklos Szeredi | 69a53bf | 2006-01-16 22:14:41 -0800 | [diff] [blame] | 1522 | * waiter is woken up. This will make request_wait_answer() wait |
| 1523 | * until the request is unlocked and then return. |
Miklos Szeredi | 64c6d8e | 2006-01-16 22:14:42 -0800 | [diff] [blame] | 1524 | * |
| 1525 | * If the request is asynchronous, then the end function needs to be |
| 1526 | * called after waiting for the request to be unlocked (if it was |
| 1527 | * locked). |
Miklos Szeredi | 69a53bf | 2006-01-16 22:14:41 -0800 | [diff] [blame] | 1528 | */ |
| 1529 | static void end_io_requests(struct fuse_conn *fc) |
Harvey Harrison | 5d9ec85 | 2008-12-02 14:49:42 +0100 | [diff] [blame] | 1530 | __releases(&fc->lock) |
| 1531 | __acquires(&fc->lock) |
Miklos Szeredi | 69a53bf | 2006-01-16 22:14:41 -0800 | [diff] [blame] | 1532 | { |
| 1533 | while (!list_empty(&fc->io)) { |
Miklos Szeredi | 64c6d8e | 2006-01-16 22:14:42 -0800 | [diff] [blame] | 1534 | struct fuse_req *req = |
| 1535 | list_entry(fc->io.next, struct fuse_req, list); |
| 1536 | void (*end) (struct fuse_conn *, struct fuse_req *) = req->end; |
| 1537 | |
Miklos Szeredi | f9a2842 | 2006-06-25 05:48:53 -0700 | [diff] [blame] | 1538 | req->aborted = 1; |
Miklos Szeredi | 69a53bf | 2006-01-16 22:14:41 -0800 | [diff] [blame] | 1539 | req->out.h.error = -ECONNABORTED; |
| 1540 | req->state = FUSE_REQ_FINISHED; |
| 1541 | list_del_init(&req->list); |
| 1542 | wake_up(&req->waitq); |
Miklos Szeredi | 64c6d8e | 2006-01-16 22:14:42 -0800 | [diff] [blame] | 1543 | if (end) { |
| 1544 | req->end = NULL; |
Miklos Szeredi | 64c6d8e | 2006-01-16 22:14:42 -0800 | [diff] [blame] | 1545 | __fuse_get_request(req); |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 1546 | spin_unlock(&fc->lock); |
Miklos Szeredi | 64c6d8e | 2006-01-16 22:14:42 -0800 | [diff] [blame] | 1547 | wait_event(req->waitq, !req->locked); |
| 1548 | end(fc, req); |
Tejun Heo | e9bb09d | 2008-11-26 12:03:54 +0100 | [diff] [blame] | 1549 | fuse_put_request(fc, req); |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 1550 | spin_lock(&fc->lock); |
Miklos Szeredi | 64c6d8e | 2006-01-16 22:14:42 -0800 | [diff] [blame] | 1551 | } |
Miklos Szeredi | 69a53bf | 2006-01-16 22:14:41 -0800 | [diff] [blame] | 1552 | } |
| 1553 | } |
| 1554 | |
| 1555 | /* |
| 1556 | * Abort all requests. |
| 1557 | * |
| 1558 | * Emergency exit in case of a malicious or accidental deadlock, or |
| 1559 | * just a hung filesystem. |
| 1560 | * |
| 1561 | * The same effect is usually achievable through killing the |
| 1562 | * filesystem daemon and all users of the filesystem. The exception |
| 1563 | * is the combination of an asynchronous request and the tricky |
| 1564 | * deadlock (see Documentation/filesystems/fuse.txt). |
| 1565 | * |
| 1566 | * During the aborting, progression of requests from the pending and |
| 1567 | * processing lists onto the io list, and progression of new requests |
| 1568 | * onto the pending list is prevented by req->connected being false. |
| 1569 | * |
| 1570 | * Progression of requests under I/O to the processing list is |
Miklos Szeredi | f9a2842 | 2006-06-25 05:48:53 -0700 | [diff] [blame] | 1571 | * prevented by the req->aborted flag being true for these requests. |
| 1572 | * For this reason requests on the io list must be aborted first. |
Miklos Szeredi | 69a53bf | 2006-01-16 22:14:41 -0800 | [diff] [blame] | 1573 | */ |
| 1574 | void fuse_abort_conn(struct fuse_conn *fc) |
| 1575 | { |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 1576 | spin_lock(&fc->lock); |
Miklos Szeredi | 69a53bf | 2006-01-16 22:14:41 -0800 | [diff] [blame] | 1577 | if (fc->connected) { |
| 1578 | fc->connected = 0; |
Miklos Szeredi | 51eb01e | 2006-06-25 05:48:50 -0700 | [diff] [blame] | 1579 | fc->blocked = 0; |
Miklos Szeredi | 69a53bf | 2006-01-16 22:14:41 -0800 | [diff] [blame] | 1580 | end_io_requests(fc); |
| 1581 | end_requests(fc, &fc->pending); |
| 1582 | end_requests(fc, &fc->processing); |
| 1583 | wake_up_all(&fc->waitq); |
Miklos Szeredi | 51eb01e | 2006-06-25 05:48:50 -0700 | [diff] [blame] | 1584 | wake_up_all(&fc->blocked_waitq); |
Jeff Dike | 385a17b | 2006-04-10 22:54:52 -0700 | [diff] [blame] | 1585 | kill_fasync(&fc->fasync, SIGIO, POLL_IN); |
Miklos Szeredi | 69a53bf | 2006-01-16 22:14:41 -0800 | [diff] [blame] | 1586 | } |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 1587 | spin_unlock(&fc->lock); |
Miklos Szeredi | 69a53bf | 2006-01-16 22:14:41 -0800 | [diff] [blame] | 1588 | } |
Tejun Heo | 08cbf54 | 2009-04-14 10:54:53 +0900 | [diff] [blame] | 1589 | EXPORT_SYMBOL_GPL(fuse_abort_conn); |
Miklos Szeredi | 69a53bf | 2006-01-16 22:14:41 -0800 | [diff] [blame] | 1590 | |
Tejun Heo | 08cbf54 | 2009-04-14 10:54:53 +0900 | [diff] [blame] | 1591 | int fuse_dev_release(struct inode *inode, struct file *file) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1592 | { |
Miklos Szeredi | 0720b31 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 1593 | struct fuse_conn *fc = fuse_get_conn(file); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1594 | if (fc) { |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 1595 | spin_lock(&fc->lock); |
Miklos Szeredi | 1e9a4ed | 2005-09-09 13:10:31 -0700 | [diff] [blame] | 1596 | fc->connected = 0; |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1597 | end_requests(fc, &fc->pending); |
| 1598 | end_requests(fc, &fc->processing); |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 1599 | spin_unlock(&fc->lock); |
Miklos Szeredi | bafa965 | 2006-06-25 05:48:51 -0700 | [diff] [blame] | 1600 | fuse_conn_put(fc); |
Jeff Dike | 385a17b | 2006-04-10 22:54:52 -0700 | [diff] [blame] | 1601 | } |
Miklos Szeredi | f543f25 | 2006-01-16 22:14:35 -0800 | [diff] [blame] | 1602 | |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1603 | return 0; |
| 1604 | } |
Tejun Heo | 08cbf54 | 2009-04-14 10:54:53 +0900 | [diff] [blame] | 1605 | EXPORT_SYMBOL_GPL(fuse_dev_release); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1606 | |
Jeff Dike | 385a17b | 2006-04-10 22:54:52 -0700 | [diff] [blame] | 1607 | static int fuse_dev_fasync(int fd, struct file *file, int on) |
| 1608 | { |
| 1609 | struct fuse_conn *fc = fuse_get_conn(file); |
| 1610 | if (!fc) |
Miklos Szeredi | a87046d | 2006-04-10 22:54:56 -0700 | [diff] [blame] | 1611 | return -EPERM; |
Jeff Dike | 385a17b | 2006-04-10 22:54:52 -0700 | [diff] [blame] | 1612 | |
| 1613 | /* No locking - fasync_helper does its own locking */ |
| 1614 | return fasync_helper(fd, file, on, &fc->fasync); |
| 1615 | } |
| 1616 | |
Arjan van de Ven | 4b6f5d2 | 2006-03-28 01:56:42 -0800 | [diff] [blame] | 1617 | const struct file_operations fuse_dev_operations = { |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1618 | .owner = THIS_MODULE, |
| 1619 | .llseek = no_llseek, |
Badari Pulavarty | ee0b3e6 | 2006-09-30 23:28:47 -0700 | [diff] [blame] | 1620 | .read = do_sync_read, |
| 1621 | .aio_read = fuse_dev_read, |
Miklos Szeredi | c302162 | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 1622 | .splice_read = fuse_dev_splice_read, |
Badari Pulavarty | ee0b3e6 | 2006-09-30 23:28:47 -0700 | [diff] [blame] | 1623 | .write = do_sync_write, |
| 1624 | .aio_write = fuse_dev_write, |
Miklos Szeredi | dd3bb14 | 2010-05-25 15:06:06 +0200 | [diff] [blame] | 1625 | .splice_write = fuse_dev_splice_write, |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1626 | .poll = fuse_dev_poll, |
| 1627 | .release = fuse_dev_release, |
Jeff Dike | 385a17b | 2006-04-10 22:54:52 -0700 | [diff] [blame] | 1628 | .fasync = fuse_dev_fasync, |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1629 | }; |
Tejun Heo | 08cbf54 | 2009-04-14 10:54:53 +0900 | [diff] [blame] | 1630 | EXPORT_SYMBOL_GPL(fuse_dev_operations); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1631 | |
| 1632 | static struct miscdevice fuse_miscdevice = { |
| 1633 | .minor = FUSE_MINOR, |
| 1634 | .name = "fuse", |
| 1635 | .fops = &fuse_dev_operations, |
| 1636 | }; |
| 1637 | |
| 1638 | int __init fuse_dev_init(void) |
| 1639 | { |
| 1640 | int err = -ENOMEM; |
| 1641 | fuse_req_cachep = kmem_cache_create("fuse_request", |
| 1642 | sizeof(struct fuse_req), |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 1643 | 0, 0, NULL); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1644 | if (!fuse_req_cachep) |
| 1645 | goto out; |
| 1646 | |
| 1647 | err = misc_register(&fuse_miscdevice); |
| 1648 | if (err) |
| 1649 | goto out_cache_clean; |
| 1650 | |
| 1651 | return 0; |
| 1652 | |
| 1653 | out_cache_clean: |
| 1654 | kmem_cache_destroy(fuse_req_cachep); |
| 1655 | out: |
| 1656 | return err; |
| 1657 | } |
| 1658 | |
| 1659 | void fuse_dev_cleanup(void) |
| 1660 | { |
| 1661 | misc_deregister(&fuse_miscdevice); |
| 1662 | kmem_cache_destroy(fuse_req_cachep); |
| 1663 | } |