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); |
| 24 | |
Christoph Lameter | e18b890 | 2006-12-06 20:33:20 -0800 | [diff] [blame] | 25 | static struct kmem_cache *fuse_req_cachep; |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 26 | |
Miklos Szeredi | 8bfc016 | 2006-01-16 22:14:28 -0800 | [diff] [blame] | 27 | static struct fuse_conn *fuse_get_conn(struct file *file) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 28 | { |
Miklos Szeredi | 0720b31 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 29 | /* |
| 30 | * Lockless access is OK, because file->private data is set |
| 31 | * once during mount and is valid until the file is released. |
| 32 | */ |
| 33 | return file->private_data; |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 34 | } |
| 35 | |
Miklos Szeredi | 8bfc016 | 2006-01-16 22:14:28 -0800 | [diff] [blame] | 36 | static void fuse_request_init(struct fuse_req *req) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 37 | { |
| 38 | memset(req, 0, sizeof(*req)); |
| 39 | INIT_LIST_HEAD(&req->list); |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 40 | INIT_LIST_HEAD(&req->intr_entry); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 41 | init_waitqueue_head(&req->waitq); |
| 42 | atomic_set(&req->count, 1); |
| 43 | } |
| 44 | |
| 45 | struct fuse_req *fuse_request_alloc(void) |
| 46 | { |
Christoph Lameter | e94b176 | 2006-12-06 20:33:17 -0800 | [diff] [blame] | 47 | struct fuse_req *req = kmem_cache_alloc(fuse_req_cachep, GFP_KERNEL); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 48 | if (req) |
| 49 | fuse_request_init(req); |
| 50 | return req; |
| 51 | } |
Tejun Heo | 08cbf54 | 2009-04-14 10:54:53 +0900 | [diff] [blame] | 52 | EXPORT_SYMBOL_GPL(fuse_request_alloc); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 53 | |
Miklos Szeredi | 3be5a52 | 2008-04-30 00:54:41 -0700 | [diff] [blame] | 54 | struct fuse_req *fuse_request_alloc_nofs(void) |
| 55 | { |
| 56 | struct fuse_req *req = kmem_cache_alloc(fuse_req_cachep, GFP_NOFS); |
| 57 | if (req) |
| 58 | fuse_request_init(req); |
| 59 | return req; |
| 60 | } |
| 61 | |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 62 | void fuse_request_free(struct fuse_req *req) |
| 63 | { |
| 64 | kmem_cache_free(fuse_req_cachep, req); |
| 65 | } |
| 66 | |
Miklos Szeredi | 8bfc016 | 2006-01-16 22:14:28 -0800 | [diff] [blame] | 67 | static void block_sigs(sigset_t *oldset) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 68 | { |
| 69 | sigset_t mask; |
| 70 | |
| 71 | siginitsetinv(&mask, sigmask(SIGKILL)); |
| 72 | sigprocmask(SIG_BLOCK, &mask, oldset); |
| 73 | } |
| 74 | |
Miklos Szeredi | 8bfc016 | 2006-01-16 22:14:28 -0800 | [diff] [blame] | 75 | static void restore_sigs(sigset_t *oldset) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 76 | { |
| 77 | sigprocmask(SIG_SETMASK, oldset, NULL); |
| 78 | } |
| 79 | |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 80 | static void __fuse_get_request(struct fuse_req *req) |
| 81 | { |
| 82 | atomic_inc(&req->count); |
| 83 | } |
| 84 | |
| 85 | /* Must be called with > 1 refcount */ |
| 86 | static void __fuse_put_request(struct fuse_req *req) |
| 87 | { |
| 88 | BUG_ON(atomic_read(&req->count) < 2); |
| 89 | atomic_dec(&req->count); |
| 90 | } |
| 91 | |
Miklos Szeredi | 33649c9 | 2006-06-25 05:48:52 -0700 | [diff] [blame] | 92 | static void fuse_req_init_context(struct fuse_req *req) |
| 93 | { |
David Howells | 2186a71 | 2008-11-14 10:38:53 +1100 | [diff] [blame] | 94 | req->in.h.uid = current_fsuid(); |
| 95 | req->in.h.gid = current_fsgid(); |
Miklos Szeredi | 33649c9 | 2006-06-25 05:48:52 -0700 | [diff] [blame] | 96 | req->in.h.pid = current->pid; |
| 97 | } |
| 98 | |
Miklos Szeredi | ce1d5a4 | 2006-04-10 22:54:58 -0700 | [diff] [blame] | 99 | struct fuse_req *fuse_get_req(struct fuse_conn *fc) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 100 | { |
Miklos Szeredi | 08a53cd | 2006-04-10 22:54:59 -0700 | [diff] [blame] | 101 | struct fuse_req *req; |
| 102 | sigset_t oldset; |
Miklos Szeredi | 9bc5ddd | 2006-04-11 21:16:09 +0200 | [diff] [blame] | 103 | int intr; |
Miklos Szeredi | 08a53cd | 2006-04-10 22:54:59 -0700 | [diff] [blame] | 104 | int err; |
| 105 | |
Miklos Szeredi | 9bc5ddd | 2006-04-11 21:16:09 +0200 | [diff] [blame] | 106 | atomic_inc(&fc->num_waiting); |
Miklos Szeredi | 08a53cd | 2006-04-10 22:54:59 -0700 | [diff] [blame] | 107 | block_sigs(&oldset); |
Miklos Szeredi | 9bc5ddd | 2006-04-11 21:16:09 +0200 | [diff] [blame] | 108 | intr = wait_event_interruptible(fc->blocked_waitq, !fc->blocked); |
Miklos Szeredi | 08a53cd | 2006-04-10 22:54:59 -0700 | [diff] [blame] | 109 | restore_sigs(&oldset); |
Miklos Szeredi | 9bc5ddd | 2006-04-11 21:16:09 +0200 | [diff] [blame] | 110 | err = -EINTR; |
| 111 | if (intr) |
| 112 | goto out; |
Miklos Szeredi | 08a53cd | 2006-04-10 22:54:59 -0700 | [diff] [blame] | 113 | |
Miklos Szeredi | 51eb01e | 2006-06-25 05:48:50 -0700 | [diff] [blame] | 114 | err = -ENOTCONN; |
| 115 | if (!fc->connected) |
| 116 | goto out; |
| 117 | |
Miklos Szeredi | 08a53cd | 2006-04-10 22:54:59 -0700 | [diff] [blame] | 118 | req = fuse_request_alloc(); |
Miklos Szeredi | 9bc5ddd | 2006-04-11 21:16:09 +0200 | [diff] [blame] | 119 | err = -ENOMEM; |
Miklos Szeredi | ce1d5a4 | 2006-04-10 22:54:58 -0700 | [diff] [blame] | 120 | if (!req) |
Miklos Szeredi | 9bc5ddd | 2006-04-11 21:16:09 +0200 | [diff] [blame] | 121 | goto out; |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 122 | |
Miklos Szeredi | 33649c9 | 2006-06-25 05:48:52 -0700 | [diff] [blame] | 123 | fuse_req_init_context(req); |
Miklos Szeredi | 9bc5ddd | 2006-04-11 21:16:09 +0200 | [diff] [blame] | 124 | req->waiting = 1; |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 125 | return req; |
Miklos Szeredi | 9bc5ddd | 2006-04-11 21:16:09 +0200 | [diff] [blame] | 126 | |
| 127 | out: |
| 128 | atomic_dec(&fc->num_waiting); |
| 129 | return ERR_PTR(err); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 130 | } |
Tejun Heo | 08cbf54 | 2009-04-14 10:54:53 +0900 | [diff] [blame] | 131 | EXPORT_SYMBOL_GPL(fuse_get_req); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 132 | |
Miklos Szeredi | 33649c9 | 2006-06-25 05:48:52 -0700 | [diff] [blame] | 133 | /* |
| 134 | * Return request in fuse_file->reserved_req. However that may |
| 135 | * currently be in use. If that is the case, wait for it to become |
| 136 | * available. |
| 137 | */ |
| 138 | static struct fuse_req *get_reserved_req(struct fuse_conn *fc, |
| 139 | struct file *file) |
| 140 | { |
| 141 | struct fuse_req *req = NULL; |
| 142 | struct fuse_file *ff = file->private_data; |
| 143 | |
| 144 | do { |
Miklos Szeredi | de5e3de | 2007-10-16 23:31:00 -0700 | [diff] [blame] | 145 | wait_event(fc->reserved_req_waitq, ff->reserved_req); |
Miklos Szeredi | 33649c9 | 2006-06-25 05:48:52 -0700 | [diff] [blame] | 146 | spin_lock(&fc->lock); |
| 147 | if (ff->reserved_req) { |
| 148 | req = ff->reserved_req; |
| 149 | ff->reserved_req = NULL; |
| 150 | get_file(file); |
| 151 | req->stolen_file = file; |
| 152 | } |
| 153 | spin_unlock(&fc->lock); |
| 154 | } while (!req); |
| 155 | |
| 156 | return req; |
| 157 | } |
| 158 | |
| 159 | /* |
| 160 | * Put stolen request back into fuse_file->reserved_req |
| 161 | */ |
| 162 | static void put_reserved_req(struct fuse_conn *fc, struct fuse_req *req) |
| 163 | { |
| 164 | struct file *file = req->stolen_file; |
| 165 | struct fuse_file *ff = file->private_data; |
| 166 | |
| 167 | spin_lock(&fc->lock); |
| 168 | fuse_request_init(req); |
| 169 | BUG_ON(ff->reserved_req); |
| 170 | ff->reserved_req = req; |
Miklos Szeredi | de5e3de | 2007-10-16 23:31:00 -0700 | [diff] [blame] | 171 | wake_up_all(&fc->reserved_req_waitq); |
Miklos Szeredi | 33649c9 | 2006-06-25 05:48:52 -0700 | [diff] [blame] | 172 | spin_unlock(&fc->lock); |
| 173 | fput(file); |
| 174 | } |
| 175 | |
| 176 | /* |
| 177 | * Gets a requests for a file operation, always succeeds |
| 178 | * |
| 179 | * This is used for sending the FLUSH request, which must get to |
| 180 | * userspace, due to POSIX locks which may need to be unlocked. |
| 181 | * |
| 182 | * If allocation fails due to OOM, use the reserved request in |
| 183 | * fuse_file. |
| 184 | * |
| 185 | * This is very unlikely to deadlock accidentally, since the |
| 186 | * filesystem should not have it's own file open. If deadlock is |
| 187 | * intentional, it can still be broken by "aborting" the filesystem. |
| 188 | */ |
| 189 | struct fuse_req *fuse_get_req_nofail(struct fuse_conn *fc, struct file *file) |
| 190 | { |
| 191 | struct fuse_req *req; |
| 192 | |
| 193 | atomic_inc(&fc->num_waiting); |
| 194 | wait_event(fc->blocked_waitq, !fc->blocked); |
| 195 | req = fuse_request_alloc(); |
| 196 | if (!req) |
| 197 | req = get_reserved_req(fc, file); |
| 198 | |
| 199 | fuse_req_init_context(req); |
| 200 | req->waiting = 1; |
| 201 | return req; |
| 202 | } |
| 203 | |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 204 | void fuse_put_request(struct fuse_conn *fc, struct fuse_req *req) |
| 205 | { |
Miklos Szeredi | 7128ec2 | 2006-02-04 23:27:40 -0800 | [diff] [blame] | 206 | if (atomic_dec_and_test(&req->count)) { |
Miklos Szeredi | 9bc5ddd | 2006-04-11 21:16:09 +0200 | [diff] [blame] | 207 | if (req->waiting) |
| 208 | atomic_dec(&fc->num_waiting); |
Miklos Szeredi | 33649c9 | 2006-06-25 05:48:52 -0700 | [diff] [blame] | 209 | |
| 210 | if (req->stolen_file) |
| 211 | put_reserved_req(fc, req); |
| 212 | else |
| 213 | fuse_request_free(req); |
Miklos Szeredi | 7128ec2 | 2006-02-04 23:27:40 -0800 | [diff] [blame] | 214 | } |
| 215 | } |
Tejun Heo | 08cbf54 | 2009-04-14 10:54:53 +0900 | [diff] [blame] | 216 | EXPORT_SYMBOL_GPL(fuse_put_request); |
Miklos Szeredi | 7128ec2 | 2006-02-04 23:27:40 -0800 | [diff] [blame] | 217 | |
Miklos Szeredi | d12def1 | 2008-02-06 01:38:39 -0800 | [diff] [blame] | 218 | static unsigned len_args(unsigned numargs, struct fuse_arg *args) |
| 219 | { |
| 220 | unsigned nbytes = 0; |
| 221 | unsigned i; |
| 222 | |
| 223 | for (i = 0; i < numargs; i++) |
| 224 | nbytes += args[i].size; |
| 225 | |
| 226 | return nbytes; |
| 227 | } |
| 228 | |
| 229 | static u64 fuse_get_unique(struct fuse_conn *fc) |
| 230 | { |
| 231 | fc->reqctr++; |
| 232 | /* zero is special */ |
| 233 | if (fc->reqctr == 0) |
| 234 | fc->reqctr = 1; |
| 235 | |
| 236 | return fc->reqctr; |
| 237 | } |
| 238 | |
| 239 | static void queue_request(struct fuse_conn *fc, struct fuse_req *req) |
| 240 | { |
| 241 | req->in.h.unique = fuse_get_unique(fc); |
| 242 | req->in.h.len = sizeof(struct fuse_in_header) + |
| 243 | len_args(req->in.numargs, (struct fuse_arg *) req->in.args); |
| 244 | list_add_tail(&req->list, &fc->pending); |
| 245 | req->state = FUSE_REQ_PENDING; |
| 246 | if (!req->waiting) { |
| 247 | req->waiting = 1; |
| 248 | atomic_inc(&fc->num_waiting); |
| 249 | } |
| 250 | wake_up(&fc->waitq); |
| 251 | kill_fasync(&fc->fasync, SIGIO, POLL_IN); |
| 252 | } |
| 253 | |
| 254 | static void flush_bg_queue(struct fuse_conn *fc) |
| 255 | { |
Csaba Henk | 7a6d3c8 | 2009-07-01 17:28:41 -0700 | [diff] [blame] | 256 | while (fc->active_background < fc->max_background && |
Miklos Szeredi | d12def1 | 2008-02-06 01:38:39 -0800 | [diff] [blame] | 257 | !list_empty(&fc->bg_queue)) { |
| 258 | struct fuse_req *req; |
| 259 | |
| 260 | req = list_entry(fc->bg_queue.next, struct fuse_req, list); |
| 261 | list_del(&req->list); |
| 262 | fc->active_background++; |
| 263 | queue_request(fc, req); |
| 264 | } |
| 265 | } |
| 266 | |
Miklos Szeredi | 6dbbcb1 | 2006-04-26 10:49:06 +0200 | [diff] [blame] | 267 | /* |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 268 | * This function is called when a request is finished. Either a reply |
Miklos Szeredi | f9a2842 | 2006-06-25 05:48:53 -0700 | [diff] [blame] | 269 | * 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] | 270 | * occurred during communication with userspace, or the device file |
Miklos Szeredi | 51eb01e | 2006-06-25 05:48:50 -0700 | [diff] [blame] | 271 | * was closed. The requester thread is woken up (if still waiting), |
| 272 | * the 'end' callback is called if given, else the reference to the |
| 273 | * request is released |
Miklos Szeredi | 7128ec2 | 2006-02-04 23:27:40 -0800 | [diff] [blame] | 274 | * |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 275 | * Called with fc->lock, unlocks it |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 276 | */ |
| 277 | static void request_end(struct fuse_conn *fc, struct fuse_req *req) |
Harvey Harrison | 5d9ec85 | 2008-12-02 14:49:42 +0100 | [diff] [blame] | 278 | __releases(&fc->lock) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 279 | { |
Miklos Szeredi | 51eb01e | 2006-06-25 05:48:50 -0700 | [diff] [blame] | 280 | void (*end) (struct fuse_conn *, struct fuse_req *) = req->end; |
| 281 | req->end = NULL; |
Miklos Szeredi | d77a1d5 | 2006-01-16 22:14:31 -0800 | [diff] [blame] | 282 | list_del(&req->list); |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 283 | list_del(&req->intr_entry); |
Miklos Szeredi | 83cfd49 | 2006-01-16 22:14:31 -0800 | [diff] [blame] | 284 | req->state = FUSE_REQ_FINISHED; |
Miklos Szeredi | 51eb01e | 2006-06-25 05:48:50 -0700 | [diff] [blame] | 285 | if (req->background) { |
Csaba Henk | 7a6d3c8 | 2009-07-01 17:28:41 -0700 | [diff] [blame] | 286 | if (fc->num_background == fc->max_background) { |
Miklos Szeredi | 51eb01e | 2006-06-25 05:48:50 -0700 | [diff] [blame] | 287 | fc->blocked = 0; |
| 288 | wake_up_all(&fc->blocked_waitq); |
| 289 | } |
Csaba Henk | 7a6d3c8 | 2009-07-01 17:28:41 -0700 | [diff] [blame] | 290 | if (fc->num_background == fc->congestion_threshold && |
Tejun Heo | a325f9b | 2009-04-14 10:54:52 +0900 | [diff] [blame] | 291 | fc->connected && fc->bdi_initialized) { |
Jens Axboe | 8aa7e84 | 2009-07-09 14:52:32 +0200 | [diff] [blame] | 292 | clear_bdi_congested(&fc->bdi, BLK_RW_SYNC); |
| 293 | clear_bdi_congested(&fc->bdi, BLK_RW_ASYNC); |
Miklos Szeredi | f92b99b | 2007-10-16 23:30:59 -0700 | [diff] [blame] | 294 | } |
Miklos Szeredi | 51eb01e | 2006-06-25 05:48:50 -0700 | [diff] [blame] | 295 | fc->num_background--; |
Miklos Szeredi | d12def1 | 2008-02-06 01:38:39 -0800 | [diff] [blame] | 296 | fc->active_background--; |
| 297 | flush_bg_queue(fc); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 298 | } |
Miklos Szeredi | 51eb01e | 2006-06-25 05:48:50 -0700 | [diff] [blame] | 299 | spin_unlock(&fc->lock); |
Miklos Szeredi | 51eb01e | 2006-06-25 05:48:50 -0700 | [diff] [blame] | 300 | wake_up(&req->waitq); |
| 301 | if (end) |
| 302 | end(fc, req); |
Tejun Heo | e9bb09d | 2008-11-26 12:03:54 +0100 | [diff] [blame] | 303 | fuse_put_request(fc, req); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 304 | } |
| 305 | |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 306 | static void wait_answer_interruptible(struct fuse_conn *fc, |
| 307 | struct fuse_req *req) |
Harvey Harrison | 5d9ec85 | 2008-12-02 14:49:42 +0100 | [diff] [blame] | 308 | __releases(&fc->lock) |
| 309 | __acquires(&fc->lock) |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 310 | { |
| 311 | if (signal_pending(current)) |
| 312 | return; |
| 313 | |
| 314 | spin_unlock(&fc->lock); |
| 315 | wait_event_interruptible(req->waitq, req->state == FUSE_REQ_FINISHED); |
| 316 | spin_lock(&fc->lock); |
| 317 | } |
| 318 | |
| 319 | static void queue_interrupt(struct fuse_conn *fc, struct fuse_req *req) |
| 320 | { |
| 321 | list_add_tail(&req->intr_entry, &fc->interrupts); |
| 322 | wake_up(&fc->waitq); |
| 323 | kill_fasync(&fc->fasync, SIGIO, POLL_IN); |
| 324 | } |
| 325 | |
Miklos Szeredi | 7c352bd | 2005-09-09 13:10:39 -0700 | [diff] [blame] | 326 | 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] | 327 | __releases(&fc->lock) |
| 328 | __acquires(&fc->lock) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 329 | { |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 330 | if (!fc->no_interrupt) { |
| 331 | /* Any signal may interrupt this */ |
| 332 | wait_answer_interruptible(fc, req); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 333 | |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 334 | if (req->aborted) |
| 335 | goto aborted; |
| 336 | if (req->state == FUSE_REQ_FINISHED) |
| 337 | return; |
| 338 | |
| 339 | req->interrupted = 1; |
| 340 | if (req->state == FUSE_REQ_SENT) |
| 341 | queue_interrupt(fc, req); |
| 342 | } |
| 343 | |
Miklos Szeredi | a131de0 | 2007-10-16 23:31:04 -0700 | [diff] [blame] | 344 | if (!req->force) { |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 345 | sigset_t oldset; |
| 346 | |
| 347 | /* Only fatal signals may interrupt this */ |
Miklos Szeredi | 51eb01e | 2006-06-25 05:48:50 -0700 | [diff] [blame] | 348 | block_sigs(&oldset); |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 349 | wait_answer_interruptible(fc, req); |
Miklos Szeredi | 51eb01e | 2006-06-25 05:48:50 -0700 | [diff] [blame] | 350 | restore_sigs(&oldset); |
Miklos Szeredi | a131de0 | 2007-10-16 23:31:04 -0700 | [diff] [blame] | 351 | |
| 352 | if (req->aborted) |
| 353 | goto aborted; |
| 354 | if (req->state == FUSE_REQ_FINISHED) |
| 355 | return; |
| 356 | |
| 357 | /* Request is not yet in userspace, bail out */ |
| 358 | if (req->state == FUSE_REQ_PENDING) { |
| 359 | list_del(&req->list); |
| 360 | __fuse_put_request(req); |
| 361 | req->out.h.error = -EINTR; |
| 362 | return; |
| 363 | } |
Miklos Szeredi | 51eb01e | 2006-06-25 05:48:50 -0700 | [diff] [blame] | 364 | } |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 365 | |
Miklos Szeredi | a131de0 | 2007-10-16 23:31:04 -0700 | [diff] [blame] | 366 | /* |
| 367 | * Either request is already in userspace, or it was forced. |
| 368 | * Wait it out. |
| 369 | */ |
| 370 | spin_unlock(&fc->lock); |
| 371 | wait_event(req->waitq, req->state == FUSE_REQ_FINISHED); |
| 372 | spin_lock(&fc->lock); |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 373 | |
Miklos Szeredi | a131de0 | 2007-10-16 23:31:04 -0700 | [diff] [blame] | 374 | if (!req->aborted) |
| 375 | return; |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 376 | |
| 377 | aborted: |
Miklos Szeredi | a131de0 | 2007-10-16 23:31:04 -0700 | [diff] [blame] | 378 | BUG_ON(req->state != FUSE_REQ_FINISHED); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 379 | if (req->locked) { |
| 380 | /* This is uninterruptible sleep, because data is |
| 381 | being copied to/from the buffers of req. During |
| 382 | locked state, there mustn't be any filesystem |
| 383 | operation (e.g. page fault), since that could lead |
| 384 | to deadlock */ |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 385 | spin_unlock(&fc->lock); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 386 | wait_event(req->waitq, !req->locked); |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 387 | spin_lock(&fc->lock); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 388 | } |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 389 | } |
| 390 | |
Tejun Heo | b93f858 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 391 | void fuse_request_send(struct fuse_conn *fc, struct fuse_req *req) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 392 | { |
| 393 | req->isreply = 1; |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 394 | spin_lock(&fc->lock); |
Miklos Szeredi | 1e9a4ed | 2005-09-09 13:10:31 -0700 | [diff] [blame] | 395 | if (!fc->connected) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 396 | req->out.h.error = -ENOTCONN; |
| 397 | else if (fc->conn_error) |
| 398 | req->out.h.error = -ECONNREFUSED; |
| 399 | else { |
| 400 | queue_request(fc, req); |
| 401 | /* acquire extra reference, since request is still needed |
| 402 | after request_end() */ |
| 403 | __fuse_get_request(req); |
| 404 | |
Miklos Szeredi | 7c352bd | 2005-09-09 13:10:39 -0700 | [diff] [blame] | 405 | request_wait_answer(fc, req); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 406 | } |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 407 | spin_unlock(&fc->lock); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 408 | } |
Tejun Heo | 08cbf54 | 2009-04-14 10:54:53 +0900 | [diff] [blame] | 409 | EXPORT_SYMBOL_GPL(fuse_request_send); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 410 | |
Tejun Heo | b93f858 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 411 | static void fuse_request_send_nowait_locked(struct fuse_conn *fc, |
| 412 | struct fuse_req *req) |
Miklos Szeredi | d12def1 | 2008-02-06 01:38:39 -0800 | [diff] [blame] | 413 | { |
| 414 | req->background = 1; |
| 415 | fc->num_background++; |
Csaba Henk | 7a6d3c8 | 2009-07-01 17:28:41 -0700 | [diff] [blame] | 416 | if (fc->num_background == fc->max_background) |
Miklos Szeredi | d12def1 | 2008-02-06 01:38:39 -0800 | [diff] [blame] | 417 | fc->blocked = 1; |
Csaba Henk | 7a6d3c8 | 2009-07-01 17:28:41 -0700 | [diff] [blame] | 418 | if (fc->num_background == fc->congestion_threshold && |
Tejun Heo | a325f9b | 2009-04-14 10:54:52 +0900 | [diff] [blame] | 419 | fc->bdi_initialized) { |
Jens Axboe | 8aa7e84 | 2009-07-09 14:52:32 +0200 | [diff] [blame] | 420 | set_bdi_congested(&fc->bdi, BLK_RW_SYNC); |
| 421 | set_bdi_congested(&fc->bdi, BLK_RW_ASYNC); |
Miklos Szeredi | d12def1 | 2008-02-06 01:38:39 -0800 | [diff] [blame] | 422 | } |
| 423 | list_add_tail(&req->list, &fc->bg_queue); |
| 424 | flush_bg_queue(fc); |
| 425 | } |
| 426 | |
Tejun Heo | b93f858 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 427 | 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] | 428 | { |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 429 | spin_lock(&fc->lock); |
Miklos Szeredi | 1e9a4ed | 2005-09-09 13:10:31 -0700 | [diff] [blame] | 430 | if (fc->connected) { |
Tejun Heo | b93f858 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 431 | fuse_request_send_nowait_locked(fc, req); |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 432 | spin_unlock(&fc->lock); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 433 | } else { |
| 434 | req->out.h.error = -ENOTCONN; |
| 435 | request_end(fc, req); |
| 436 | } |
| 437 | } |
| 438 | |
Tejun Heo | b93f858 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 439 | 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] | 440 | { |
| 441 | req->isreply = 0; |
Tejun Heo | b93f858 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 442 | fuse_request_send_nowait(fc, req); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 443 | } |
| 444 | |
Tejun Heo | b93f858 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 445 | 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] | 446 | { |
| 447 | req->isreply = 1; |
Tejun Heo | b93f858 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 448 | fuse_request_send_nowait(fc, req); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 449 | } |
Tejun Heo | 08cbf54 | 2009-04-14 10:54:53 +0900 | [diff] [blame] | 450 | EXPORT_SYMBOL_GPL(fuse_request_send_background); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 451 | |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 452 | /* |
Miklos Szeredi | 3be5a52 | 2008-04-30 00:54:41 -0700 | [diff] [blame] | 453 | * Called under fc->lock |
| 454 | * |
| 455 | * fc->connected must have been checked previously |
| 456 | */ |
Tejun Heo | b93f858 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 457 | void fuse_request_send_background_locked(struct fuse_conn *fc, |
| 458 | struct fuse_req *req) |
Miklos Szeredi | 3be5a52 | 2008-04-30 00:54:41 -0700 | [diff] [blame] | 459 | { |
| 460 | req->isreply = 1; |
Tejun Heo | b93f858 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 461 | fuse_request_send_nowait_locked(fc, req); |
Miklos Szeredi | 3be5a52 | 2008-04-30 00:54:41 -0700 | [diff] [blame] | 462 | } |
| 463 | |
| 464 | /* |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 465 | * Lock the request. Up to the next unlock_request() there mustn't be |
| 466 | * anything that could cause a page-fault. If the request was already |
Miklos Szeredi | f9a2842 | 2006-06-25 05:48:53 -0700 | [diff] [blame] | 467 | * aborted bail out. |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 468 | */ |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 469 | static int lock_request(struct fuse_conn *fc, struct fuse_req *req) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 470 | { |
| 471 | int err = 0; |
| 472 | if (req) { |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 473 | spin_lock(&fc->lock); |
Miklos Szeredi | f9a2842 | 2006-06-25 05:48:53 -0700 | [diff] [blame] | 474 | if (req->aborted) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 475 | err = -ENOENT; |
| 476 | else |
| 477 | req->locked = 1; |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 478 | spin_unlock(&fc->lock); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 479 | } |
| 480 | return err; |
| 481 | } |
| 482 | |
| 483 | /* |
Miklos Szeredi | f9a2842 | 2006-06-25 05:48:53 -0700 | [diff] [blame] | 484 | * Unlock request. If it was aborted during being locked, the |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 485 | * requester thread is currently waiting for it to be unlocked, so |
| 486 | * wake it up. |
| 487 | */ |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 488 | static void unlock_request(struct fuse_conn *fc, struct fuse_req *req) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 489 | { |
| 490 | if (req) { |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 491 | spin_lock(&fc->lock); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 492 | req->locked = 0; |
Miklos Szeredi | f9a2842 | 2006-06-25 05:48:53 -0700 | [diff] [blame] | 493 | if (req->aborted) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 494 | wake_up(&req->waitq); |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 495 | spin_unlock(&fc->lock); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 496 | } |
| 497 | } |
| 498 | |
| 499 | struct fuse_copy_state { |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 500 | struct fuse_conn *fc; |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 501 | int write; |
| 502 | struct fuse_req *req; |
| 503 | const struct iovec *iov; |
Miklos Szeredi | dd3bb14 | 2010-05-25 15:06:06 +0200 | [diff] [blame] | 504 | struct pipe_buffer *pipebufs; |
| 505 | struct pipe_buffer *currbuf; |
| 506 | struct pipe_inode_info *pipe; |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 507 | unsigned long nr_segs; |
| 508 | unsigned long seglen; |
| 509 | unsigned long addr; |
| 510 | struct page *pg; |
| 511 | void *mapaddr; |
| 512 | void *buf; |
| 513 | unsigned len; |
Miklos Szeredi | ce534fb | 2010-05-25 15:06:07 +0200 | [diff] [blame^] | 514 | unsigned move_pages:1; |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 515 | }; |
| 516 | |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 517 | static void fuse_copy_init(struct fuse_copy_state *cs, struct fuse_conn *fc, |
| 518 | int write, struct fuse_req *req, |
| 519 | const struct iovec *iov, unsigned long nr_segs) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 520 | { |
| 521 | memset(cs, 0, sizeof(*cs)); |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 522 | cs->fc = fc; |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 523 | cs->write = write; |
| 524 | cs->req = req; |
| 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 | |
| 535 | buf->ops->unmap(cs->pipe, buf, cs->mapaddr); |
| 536 | |
| 537 | cs->currbuf = NULL; |
| 538 | cs->mapaddr = NULL; |
| 539 | } else if (cs->mapaddr) { |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 540 | kunmap_atomic(cs->mapaddr, KM_USER0); |
| 541 | if (cs->write) { |
| 542 | flush_dcache_page(cs->pg); |
| 543 | set_page_dirty_lock(cs->pg); |
| 544 | } |
| 545 | put_page(cs->pg); |
| 546 | cs->mapaddr = NULL; |
| 547 | } |
| 548 | } |
| 549 | |
| 550 | /* |
| 551 | * Get another pagefull of userspace buffer, and map it to kernel |
| 552 | * address space, and lock request |
| 553 | */ |
| 554 | static int fuse_copy_fill(struct fuse_copy_state *cs) |
| 555 | { |
| 556 | unsigned long offset; |
| 557 | int err; |
| 558 | |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 559 | unlock_request(cs->fc, cs->req); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 560 | fuse_copy_finish(cs); |
Miklos Szeredi | dd3bb14 | 2010-05-25 15:06:06 +0200 | [diff] [blame] | 561 | if (cs->pipebufs) { |
| 562 | struct pipe_buffer *buf = cs->pipebufs; |
| 563 | |
| 564 | err = buf->ops->confirm(cs->pipe, buf); |
| 565 | if (err) |
| 566 | return err; |
| 567 | |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 568 | BUG_ON(!cs->nr_segs); |
Miklos Szeredi | dd3bb14 | 2010-05-25 15:06:06 +0200 | [diff] [blame] | 569 | cs->currbuf = buf; |
| 570 | cs->mapaddr = buf->ops->map(cs->pipe, buf, 1); |
| 571 | cs->len = buf->len; |
| 572 | cs->buf = cs->mapaddr + buf->offset; |
| 573 | cs->pipebufs++; |
Miklos Szeredi | 1729a16 | 2008-11-26 12:03:54 +0100 | [diff] [blame] | 574 | cs->nr_segs--; |
Miklos Szeredi | dd3bb14 | 2010-05-25 15:06:06 +0200 | [diff] [blame] | 575 | } else { |
| 576 | if (!cs->seglen) { |
| 577 | BUG_ON(!cs->nr_segs); |
| 578 | cs->seglen = cs->iov[0].iov_len; |
| 579 | cs->addr = (unsigned long) cs->iov[0].iov_base; |
| 580 | cs->iov++; |
| 581 | cs->nr_segs--; |
| 582 | } |
| 583 | err = get_user_pages_fast(cs->addr, 1, cs->write, &cs->pg); |
| 584 | if (err < 0) |
| 585 | return err; |
| 586 | BUG_ON(err != 1); |
| 587 | offset = cs->addr % PAGE_SIZE; |
| 588 | cs->mapaddr = kmap_atomic(cs->pg, KM_USER0); |
| 589 | cs->buf = cs->mapaddr + offset; |
| 590 | cs->len = min(PAGE_SIZE - offset, cs->seglen); |
| 591 | cs->seglen -= cs->len; |
| 592 | cs->addr += cs->len; |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 593 | } |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 594 | |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 595 | return lock_request(cs->fc, cs->req); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 596 | } |
| 597 | |
| 598 | /* Do as much copy to/from userspace buffer as we can */ |
Miklos Szeredi | 8bfc016 | 2006-01-16 22:14:28 -0800 | [diff] [blame] | 599 | 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] | 600 | { |
| 601 | unsigned ncpy = min(*size, cs->len); |
| 602 | if (val) { |
| 603 | if (cs->write) |
| 604 | memcpy(cs->buf, *val, ncpy); |
| 605 | else |
| 606 | memcpy(*val, cs->buf, ncpy); |
| 607 | *val += ncpy; |
| 608 | } |
| 609 | *size -= ncpy; |
| 610 | cs->len -= ncpy; |
| 611 | cs->buf += ncpy; |
| 612 | return ncpy; |
| 613 | } |
| 614 | |
Miklos Szeredi | ce534fb | 2010-05-25 15:06:07 +0200 | [diff] [blame^] | 615 | static int fuse_check_page(struct page *page) |
| 616 | { |
| 617 | if (page_mapcount(page) || |
| 618 | page->mapping != NULL || |
| 619 | page_count(page) != 1 || |
| 620 | (page->flags & PAGE_FLAGS_CHECK_AT_PREP & |
| 621 | ~(1 << PG_locked | |
| 622 | 1 << PG_referenced | |
| 623 | 1 << PG_uptodate | |
| 624 | 1 << PG_lru | |
| 625 | 1 << PG_active | |
| 626 | 1 << PG_reclaim))) { |
| 627 | printk(KERN_WARNING "fuse: trying to steal weird page\n"); |
| 628 | 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); |
| 629 | return 1; |
| 630 | } |
| 631 | return 0; |
| 632 | } |
| 633 | |
| 634 | static int fuse_try_move_page(struct fuse_copy_state *cs, struct page **pagep) |
| 635 | { |
| 636 | int err; |
| 637 | struct page *oldpage = *pagep; |
| 638 | struct page *newpage; |
| 639 | struct pipe_buffer *buf = cs->pipebufs; |
| 640 | struct address_space *mapping; |
| 641 | pgoff_t index; |
| 642 | |
| 643 | unlock_request(cs->fc, cs->req); |
| 644 | fuse_copy_finish(cs); |
| 645 | |
| 646 | err = buf->ops->confirm(cs->pipe, buf); |
| 647 | if (err) |
| 648 | return err; |
| 649 | |
| 650 | BUG_ON(!cs->nr_segs); |
| 651 | cs->currbuf = buf; |
| 652 | cs->len = buf->len; |
| 653 | cs->pipebufs++; |
| 654 | cs->nr_segs--; |
| 655 | |
| 656 | if (cs->len != PAGE_SIZE) |
| 657 | goto out_fallback; |
| 658 | |
| 659 | if (buf->ops->steal(cs->pipe, buf) != 0) |
| 660 | goto out_fallback; |
| 661 | |
| 662 | newpage = buf->page; |
| 663 | |
| 664 | if (WARN_ON(!PageUptodate(newpage))) |
| 665 | return -EIO; |
| 666 | |
| 667 | ClearPageMappedToDisk(newpage); |
| 668 | |
| 669 | if (fuse_check_page(newpage) != 0) |
| 670 | goto out_fallback_unlock; |
| 671 | |
| 672 | mapping = oldpage->mapping; |
| 673 | index = oldpage->index; |
| 674 | |
| 675 | /* |
| 676 | * This is a new and locked page, it shouldn't be mapped or |
| 677 | * have any special flags on it |
| 678 | */ |
| 679 | if (WARN_ON(page_mapped(oldpage))) |
| 680 | goto out_fallback_unlock; |
| 681 | if (WARN_ON(page_has_private(oldpage))) |
| 682 | goto out_fallback_unlock; |
| 683 | if (WARN_ON(PageDirty(oldpage) || PageWriteback(oldpage))) |
| 684 | goto out_fallback_unlock; |
| 685 | if (WARN_ON(PageMlocked(oldpage))) |
| 686 | goto out_fallback_unlock; |
| 687 | |
| 688 | remove_from_page_cache(oldpage); |
| 689 | page_cache_release(oldpage); |
| 690 | |
| 691 | err = add_to_page_cache_locked(newpage, mapping, index, GFP_KERNEL); |
| 692 | if (err) { |
| 693 | printk(KERN_WARNING "fuse_try_move_page: failed to add page"); |
| 694 | goto out_fallback_unlock; |
| 695 | } |
| 696 | page_cache_get(newpage); |
| 697 | |
| 698 | if (!(buf->flags & PIPE_BUF_FLAG_LRU)) |
| 699 | lru_cache_add_file(newpage); |
| 700 | |
| 701 | err = 0; |
| 702 | spin_lock(&cs->fc->lock); |
| 703 | if (cs->req->aborted) |
| 704 | err = -ENOENT; |
| 705 | else |
| 706 | *pagep = newpage; |
| 707 | spin_unlock(&cs->fc->lock); |
| 708 | |
| 709 | if (err) { |
| 710 | unlock_page(newpage); |
| 711 | page_cache_release(newpage); |
| 712 | return err; |
| 713 | } |
| 714 | |
| 715 | unlock_page(oldpage); |
| 716 | page_cache_release(oldpage); |
| 717 | cs->len = 0; |
| 718 | |
| 719 | return 0; |
| 720 | |
| 721 | out_fallback_unlock: |
| 722 | unlock_page(newpage); |
| 723 | out_fallback: |
| 724 | cs->mapaddr = buf->ops->map(cs->pipe, buf, 1); |
| 725 | cs->buf = cs->mapaddr + buf->offset; |
| 726 | |
| 727 | err = lock_request(cs->fc, cs->req); |
| 728 | if (err) |
| 729 | return err; |
| 730 | |
| 731 | return 1; |
| 732 | } |
| 733 | |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 734 | /* |
| 735 | * Copy a page in the request to/from the userspace buffer. Must be |
| 736 | * done atomically |
| 737 | */ |
Miklos Szeredi | ce534fb | 2010-05-25 15:06:07 +0200 | [diff] [blame^] | 738 | 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] | 739 | unsigned offset, unsigned count, int zeroing) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 740 | { |
Miklos Szeredi | ce534fb | 2010-05-25 15:06:07 +0200 | [diff] [blame^] | 741 | int err; |
| 742 | struct page *page = *pagep; |
| 743 | |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 744 | if (page && zeroing && count < PAGE_SIZE) { |
| 745 | void *mapaddr = kmap_atomic(page, KM_USER1); |
| 746 | memset(mapaddr, 0, PAGE_SIZE); |
| 747 | kunmap_atomic(mapaddr, KM_USER1); |
| 748 | } |
| 749 | while (count) { |
Miklos Szeredi | 1729a16 | 2008-11-26 12:03:54 +0100 | [diff] [blame] | 750 | if (!cs->len) { |
Miklos Szeredi | ce534fb | 2010-05-25 15:06:07 +0200 | [diff] [blame^] | 751 | if (cs->move_pages && page && |
| 752 | offset == 0 && count == PAGE_SIZE) { |
| 753 | err = fuse_try_move_page(cs, pagep); |
| 754 | if (err <= 0) |
| 755 | return err; |
| 756 | } else { |
| 757 | err = fuse_copy_fill(cs); |
| 758 | if (err) |
| 759 | return err; |
| 760 | } |
Miklos Szeredi | 1729a16 | 2008-11-26 12:03:54 +0100 | [diff] [blame] | 761 | } |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 762 | if (page) { |
| 763 | void *mapaddr = kmap_atomic(page, KM_USER1); |
| 764 | void *buf = mapaddr + offset; |
| 765 | offset += fuse_copy_do(cs, &buf, &count); |
| 766 | kunmap_atomic(mapaddr, KM_USER1); |
| 767 | } else |
| 768 | offset += fuse_copy_do(cs, NULL, &count); |
| 769 | } |
| 770 | if (page && !cs->write) |
| 771 | flush_dcache_page(page); |
| 772 | return 0; |
| 773 | } |
| 774 | |
| 775 | /* Copy pages in the request to/from userspace buffer */ |
| 776 | static int fuse_copy_pages(struct fuse_copy_state *cs, unsigned nbytes, |
| 777 | int zeroing) |
| 778 | { |
| 779 | unsigned i; |
| 780 | struct fuse_req *req = cs->req; |
| 781 | unsigned offset = req->page_offset; |
| 782 | unsigned count = min(nbytes, (unsigned) PAGE_SIZE - offset); |
| 783 | |
| 784 | for (i = 0; i < req->num_pages && (nbytes || zeroing); i++) { |
Miklos Szeredi | ce534fb | 2010-05-25 15:06:07 +0200 | [diff] [blame^] | 785 | int err; |
| 786 | |
| 787 | err = fuse_copy_page(cs, &req->pages[i], offset, count, |
| 788 | zeroing); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 789 | if (err) |
| 790 | return err; |
| 791 | |
| 792 | nbytes -= count; |
| 793 | count = min(nbytes, (unsigned) PAGE_SIZE); |
| 794 | offset = 0; |
| 795 | } |
| 796 | return 0; |
| 797 | } |
| 798 | |
| 799 | /* Copy a single argument in the request to/from userspace buffer */ |
| 800 | static int fuse_copy_one(struct fuse_copy_state *cs, void *val, unsigned size) |
| 801 | { |
| 802 | while (size) { |
Miklos Szeredi | 1729a16 | 2008-11-26 12:03:54 +0100 | [diff] [blame] | 803 | if (!cs->len) { |
| 804 | int err = fuse_copy_fill(cs); |
| 805 | if (err) |
| 806 | return err; |
| 807 | } |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 808 | fuse_copy_do(cs, &val, &size); |
| 809 | } |
| 810 | return 0; |
| 811 | } |
| 812 | |
| 813 | /* Copy request arguments to/from userspace buffer */ |
| 814 | static int fuse_copy_args(struct fuse_copy_state *cs, unsigned numargs, |
| 815 | unsigned argpages, struct fuse_arg *args, |
| 816 | int zeroing) |
| 817 | { |
| 818 | int err = 0; |
| 819 | unsigned i; |
| 820 | |
| 821 | for (i = 0; !err && i < numargs; i++) { |
| 822 | struct fuse_arg *arg = &args[i]; |
| 823 | if (i == numargs - 1 && argpages) |
| 824 | err = fuse_copy_pages(cs, arg->size, zeroing); |
| 825 | else |
| 826 | err = fuse_copy_one(cs, arg->value, arg->size); |
| 827 | } |
| 828 | return err; |
| 829 | } |
| 830 | |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 831 | static int request_pending(struct fuse_conn *fc) |
| 832 | { |
| 833 | return !list_empty(&fc->pending) || !list_empty(&fc->interrupts); |
| 834 | } |
| 835 | |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 836 | /* Wait until a request is available on the pending list */ |
| 837 | static void request_wait(struct fuse_conn *fc) |
Harvey Harrison | 5d9ec85 | 2008-12-02 14:49:42 +0100 | [diff] [blame] | 838 | __releases(&fc->lock) |
| 839 | __acquires(&fc->lock) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 840 | { |
| 841 | DECLARE_WAITQUEUE(wait, current); |
| 842 | |
| 843 | add_wait_queue_exclusive(&fc->waitq, &wait); |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 844 | while (fc->connected && !request_pending(fc)) { |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 845 | set_current_state(TASK_INTERRUPTIBLE); |
| 846 | if (signal_pending(current)) |
| 847 | break; |
| 848 | |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 849 | spin_unlock(&fc->lock); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 850 | schedule(); |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 851 | spin_lock(&fc->lock); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 852 | } |
| 853 | set_current_state(TASK_RUNNING); |
| 854 | remove_wait_queue(&fc->waitq, &wait); |
| 855 | } |
| 856 | |
| 857 | /* |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 858 | * Transfer an interrupt request to userspace |
| 859 | * |
| 860 | * Unlike other requests this is assembled on demand, without a need |
| 861 | * to allocate a separate fuse_req structure. |
| 862 | * |
| 863 | * Called with fc->lock held, releases it |
| 864 | */ |
| 865 | static int fuse_read_interrupt(struct fuse_conn *fc, struct fuse_req *req, |
| 866 | const struct iovec *iov, unsigned long nr_segs) |
Harvey Harrison | 5d9ec85 | 2008-12-02 14:49:42 +0100 | [diff] [blame] | 867 | __releases(&fc->lock) |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 868 | { |
| 869 | struct fuse_copy_state cs; |
| 870 | struct fuse_in_header ih; |
| 871 | struct fuse_interrupt_in arg; |
| 872 | unsigned reqsize = sizeof(ih) + sizeof(arg); |
| 873 | int err; |
| 874 | |
| 875 | list_del_init(&req->intr_entry); |
| 876 | req->intr_unique = fuse_get_unique(fc); |
| 877 | memset(&ih, 0, sizeof(ih)); |
| 878 | memset(&arg, 0, sizeof(arg)); |
| 879 | ih.len = reqsize; |
| 880 | ih.opcode = FUSE_INTERRUPT; |
| 881 | ih.unique = req->intr_unique; |
| 882 | arg.unique = req->in.h.unique; |
| 883 | |
| 884 | spin_unlock(&fc->lock); |
| 885 | if (iov_length(iov, nr_segs) < reqsize) |
| 886 | return -EINVAL; |
| 887 | |
| 888 | fuse_copy_init(&cs, fc, 1, NULL, iov, nr_segs); |
| 889 | err = fuse_copy_one(&cs, &ih, sizeof(ih)); |
| 890 | if (!err) |
| 891 | err = fuse_copy_one(&cs, &arg, sizeof(arg)); |
| 892 | fuse_copy_finish(&cs); |
| 893 | |
| 894 | return err ? err : reqsize; |
| 895 | } |
| 896 | |
| 897 | /* |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 898 | * Read a single request into the userspace filesystem's buffer. This |
| 899 | * function waits until a request is available, then removes it from |
| 900 | * the pending list and copies request data to userspace buffer. If |
Miklos Szeredi | f9a2842 | 2006-06-25 05:48:53 -0700 | [diff] [blame] | 901 | * no reply is needed (FORGET) or request has been aborted or there |
| 902 | * was an error during the copying then it's finished by calling |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 903 | * request_end(). Otherwise add it to the processing list, and set |
| 904 | * the 'sent' flag. |
| 905 | */ |
Badari Pulavarty | ee0b3e6 | 2006-09-30 23:28:47 -0700 | [diff] [blame] | 906 | static ssize_t fuse_dev_read(struct kiocb *iocb, const struct iovec *iov, |
| 907 | unsigned long nr_segs, loff_t pos) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 908 | { |
| 909 | int err; |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 910 | struct fuse_req *req; |
| 911 | struct fuse_in *in; |
| 912 | struct fuse_copy_state cs; |
| 913 | unsigned reqsize; |
Badari Pulavarty | ee0b3e6 | 2006-09-30 23:28:47 -0700 | [diff] [blame] | 914 | struct file *file = iocb->ki_filp; |
Miklos Szeredi | 0720b31 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 915 | struct fuse_conn *fc = fuse_get_conn(file); |
| 916 | if (!fc) |
| 917 | return -EPERM; |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 918 | |
Miklos Szeredi | 1d3d752 | 2006-01-06 00:19:40 -0800 | [diff] [blame] | 919 | restart: |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 920 | spin_lock(&fc->lock); |
Jeff Dike | e5ac1d1 | 2006-04-10 22:54:53 -0700 | [diff] [blame] | 921 | err = -EAGAIN; |
| 922 | if ((file->f_flags & O_NONBLOCK) && fc->connected && |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 923 | !request_pending(fc)) |
Jeff Dike | e5ac1d1 | 2006-04-10 22:54:53 -0700 | [diff] [blame] | 924 | goto err_unlock; |
| 925 | |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 926 | request_wait(fc); |
| 927 | err = -ENODEV; |
Miklos Szeredi | 9ba7cbb | 2006-01-16 22:14:34 -0800 | [diff] [blame] | 928 | if (!fc->connected) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 929 | goto err_unlock; |
| 930 | err = -ERESTARTSYS; |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 931 | if (!request_pending(fc)) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 932 | goto err_unlock; |
| 933 | |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 934 | if (!list_empty(&fc->interrupts)) { |
| 935 | req = list_entry(fc->interrupts.next, struct fuse_req, |
| 936 | intr_entry); |
| 937 | return fuse_read_interrupt(fc, req, iov, nr_segs); |
| 938 | } |
| 939 | |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 940 | req = list_entry(fc->pending.next, struct fuse_req, list); |
Miklos Szeredi | 83cfd49 | 2006-01-16 22:14:31 -0800 | [diff] [blame] | 941 | req->state = FUSE_REQ_READING; |
Miklos Szeredi | d77a1d5 | 2006-01-16 22:14:31 -0800 | [diff] [blame] | 942 | list_move(&req->list, &fc->io); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 943 | |
| 944 | in = &req->in; |
Miklos Szeredi | 1d3d752 | 2006-01-06 00:19:40 -0800 | [diff] [blame] | 945 | reqsize = in->h.len; |
| 946 | /* If request is too large, reply with an error and restart the read */ |
| 947 | if (iov_length(iov, nr_segs) < reqsize) { |
| 948 | req->out.h.error = -EIO; |
| 949 | /* SETXATTR is special, since it may contain too large data */ |
| 950 | if (in->h.opcode == FUSE_SETXATTR) |
| 951 | req->out.h.error = -E2BIG; |
| 952 | request_end(fc, req); |
| 953 | goto restart; |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 954 | } |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 955 | spin_unlock(&fc->lock); |
| 956 | fuse_copy_init(&cs, fc, 1, req, iov, nr_segs); |
Miklos Szeredi | 1d3d752 | 2006-01-06 00:19:40 -0800 | [diff] [blame] | 957 | err = fuse_copy_one(&cs, &in->h, sizeof(in->h)); |
| 958 | if (!err) |
| 959 | err = fuse_copy_args(&cs, in->numargs, in->argpages, |
| 960 | (struct fuse_arg *) in->args, 0); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 961 | fuse_copy_finish(&cs); |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 962 | spin_lock(&fc->lock); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 963 | req->locked = 0; |
Miklos Szeredi | c9c9d7d | 2007-10-16 23:31:05 -0700 | [diff] [blame] | 964 | if (req->aborted) { |
| 965 | request_end(fc, req); |
| 966 | return -ENODEV; |
| 967 | } |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 968 | if (err) { |
Miklos Szeredi | c9c9d7d | 2007-10-16 23:31:05 -0700 | [diff] [blame] | 969 | req->out.h.error = -EIO; |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 970 | request_end(fc, req); |
| 971 | return err; |
| 972 | } |
| 973 | if (!req->isreply) |
| 974 | request_end(fc, req); |
| 975 | else { |
Miklos Szeredi | 83cfd49 | 2006-01-16 22:14:31 -0800 | [diff] [blame] | 976 | req->state = FUSE_REQ_SENT; |
Miklos Szeredi | d77a1d5 | 2006-01-16 22:14:31 -0800 | [diff] [blame] | 977 | list_move_tail(&req->list, &fc->processing); |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 978 | if (req->interrupted) |
| 979 | queue_interrupt(fc, req); |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 980 | spin_unlock(&fc->lock); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 981 | } |
| 982 | return reqsize; |
| 983 | |
| 984 | err_unlock: |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 985 | spin_unlock(&fc->lock); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 986 | return err; |
| 987 | } |
| 988 | |
Tejun Heo | 95668a6 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 989 | static int fuse_notify_poll(struct fuse_conn *fc, unsigned int size, |
| 990 | struct fuse_copy_state *cs) |
| 991 | { |
| 992 | struct fuse_notify_poll_wakeup_out outarg; |
Miklos Szeredi | f6d47a1 | 2009-01-26 15:00:59 +0100 | [diff] [blame] | 993 | int err = -EINVAL; |
Tejun Heo | 95668a6 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 994 | |
| 995 | if (size != sizeof(outarg)) |
Miklos Szeredi | f6d47a1 | 2009-01-26 15:00:59 +0100 | [diff] [blame] | 996 | goto err; |
Tejun Heo | 95668a6 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 997 | |
| 998 | err = fuse_copy_one(cs, &outarg, sizeof(outarg)); |
| 999 | if (err) |
Miklos Szeredi | f6d47a1 | 2009-01-26 15:00:59 +0100 | [diff] [blame] | 1000 | goto err; |
Tejun Heo | 95668a6 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 1001 | |
Miklos Szeredi | f6d47a1 | 2009-01-26 15:00:59 +0100 | [diff] [blame] | 1002 | fuse_copy_finish(cs); |
Tejun Heo | 95668a6 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 1003 | return fuse_notify_poll_wakeup(fc, &outarg); |
Miklos Szeredi | f6d47a1 | 2009-01-26 15:00:59 +0100 | [diff] [blame] | 1004 | |
| 1005 | err: |
| 1006 | fuse_copy_finish(cs); |
| 1007 | return err; |
Tejun Heo | 95668a6 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 1008 | } |
| 1009 | |
John Muir | 3b463ae | 2009-05-31 11:13:57 -0400 | [diff] [blame] | 1010 | static int fuse_notify_inval_inode(struct fuse_conn *fc, unsigned int size, |
| 1011 | struct fuse_copy_state *cs) |
| 1012 | { |
| 1013 | struct fuse_notify_inval_inode_out outarg; |
| 1014 | int err = -EINVAL; |
| 1015 | |
| 1016 | if (size != sizeof(outarg)) |
| 1017 | goto err; |
| 1018 | |
| 1019 | err = fuse_copy_one(cs, &outarg, sizeof(outarg)); |
| 1020 | if (err) |
| 1021 | goto err; |
| 1022 | fuse_copy_finish(cs); |
| 1023 | |
| 1024 | down_read(&fc->killsb); |
| 1025 | err = -ENOENT; |
Miklos Szeredi | b21dda4 | 2010-02-05 12:08:31 +0100 | [diff] [blame] | 1026 | if (fc->sb) { |
| 1027 | err = fuse_reverse_inval_inode(fc->sb, outarg.ino, |
| 1028 | outarg.off, outarg.len); |
| 1029 | } |
John Muir | 3b463ae | 2009-05-31 11:13:57 -0400 | [diff] [blame] | 1030 | up_read(&fc->killsb); |
| 1031 | return err; |
| 1032 | |
| 1033 | err: |
| 1034 | fuse_copy_finish(cs); |
| 1035 | return err; |
| 1036 | } |
| 1037 | |
| 1038 | static int fuse_notify_inval_entry(struct fuse_conn *fc, unsigned int size, |
| 1039 | struct fuse_copy_state *cs) |
| 1040 | { |
| 1041 | struct fuse_notify_inval_entry_out outarg; |
Fang Wenqi | b2d82ee | 2009-12-30 18:37:13 +0800 | [diff] [blame] | 1042 | int err = -ENOMEM; |
| 1043 | char *buf; |
John Muir | 3b463ae | 2009-05-31 11:13:57 -0400 | [diff] [blame] | 1044 | struct qstr name; |
| 1045 | |
Fang Wenqi | b2d82ee | 2009-12-30 18:37:13 +0800 | [diff] [blame] | 1046 | buf = kzalloc(FUSE_NAME_MAX + 1, GFP_KERNEL); |
| 1047 | if (!buf) |
| 1048 | goto err; |
| 1049 | |
| 1050 | err = -EINVAL; |
John Muir | 3b463ae | 2009-05-31 11:13:57 -0400 | [diff] [blame] | 1051 | if (size < sizeof(outarg)) |
| 1052 | goto err; |
| 1053 | |
| 1054 | err = fuse_copy_one(cs, &outarg, sizeof(outarg)); |
| 1055 | if (err) |
| 1056 | goto err; |
| 1057 | |
| 1058 | err = -ENAMETOOLONG; |
| 1059 | if (outarg.namelen > FUSE_NAME_MAX) |
| 1060 | goto err; |
| 1061 | |
| 1062 | name.name = buf; |
| 1063 | name.len = outarg.namelen; |
| 1064 | err = fuse_copy_one(cs, buf, outarg.namelen + 1); |
| 1065 | if (err) |
| 1066 | goto err; |
| 1067 | fuse_copy_finish(cs); |
| 1068 | buf[outarg.namelen] = 0; |
| 1069 | name.hash = full_name_hash(name.name, name.len); |
| 1070 | |
| 1071 | down_read(&fc->killsb); |
| 1072 | err = -ENOENT; |
Miklos Szeredi | b21dda4 | 2010-02-05 12:08:31 +0100 | [diff] [blame] | 1073 | if (fc->sb) |
| 1074 | err = fuse_reverse_inval_entry(fc->sb, outarg.parent, &name); |
John Muir | 3b463ae | 2009-05-31 11:13:57 -0400 | [diff] [blame] | 1075 | up_read(&fc->killsb); |
Fang Wenqi | b2d82ee | 2009-12-30 18:37:13 +0800 | [diff] [blame] | 1076 | kfree(buf); |
John Muir | 3b463ae | 2009-05-31 11:13:57 -0400 | [diff] [blame] | 1077 | return err; |
| 1078 | |
| 1079 | err: |
Fang Wenqi | b2d82ee | 2009-12-30 18:37:13 +0800 | [diff] [blame] | 1080 | kfree(buf); |
John Muir | 3b463ae | 2009-05-31 11:13:57 -0400 | [diff] [blame] | 1081 | fuse_copy_finish(cs); |
| 1082 | return err; |
| 1083 | } |
| 1084 | |
Tejun Heo | 8599396 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 1085 | static int fuse_notify(struct fuse_conn *fc, enum fuse_notify_code code, |
| 1086 | unsigned int size, struct fuse_copy_state *cs) |
| 1087 | { |
| 1088 | switch (code) { |
Tejun Heo | 95668a6 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 1089 | case FUSE_NOTIFY_POLL: |
| 1090 | return fuse_notify_poll(fc, size, cs); |
| 1091 | |
John Muir | 3b463ae | 2009-05-31 11:13:57 -0400 | [diff] [blame] | 1092 | case FUSE_NOTIFY_INVAL_INODE: |
| 1093 | return fuse_notify_inval_inode(fc, size, cs); |
| 1094 | |
| 1095 | case FUSE_NOTIFY_INVAL_ENTRY: |
| 1096 | return fuse_notify_inval_entry(fc, size, cs); |
| 1097 | |
Tejun Heo | 8599396 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 1098 | default: |
Miklos Szeredi | f6d47a1 | 2009-01-26 15:00:59 +0100 | [diff] [blame] | 1099 | fuse_copy_finish(cs); |
Tejun Heo | 8599396 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 1100 | return -EINVAL; |
| 1101 | } |
| 1102 | } |
| 1103 | |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1104 | /* Look up request on processing list by unique ID */ |
| 1105 | static struct fuse_req *request_find(struct fuse_conn *fc, u64 unique) |
| 1106 | { |
| 1107 | struct list_head *entry; |
| 1108 | |
| 1109 | list_for_each(entry, &fc->processing) { |
| 1110 | struct fuse_req *req; |
| 1111 | req = list_entry(entry, struct fuse_req, list); |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 1112 | if (req->in.h.unique == unique || req->intr_unique == unique) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1113 | return req; |
| 1114 | } |
| 1115 | return NULL; |
| 1116 | } |
| 1117 | |
| 1118 | static int copy_out_args(struct fuse_copy_state *cs, struct fuse_out *out, |
| 1119 | unsigned nbytes) |
| 1120 | { |
| 1121 | unsigned reqsize = sizeof(struct fuse_out_header); |
| 1122 | |
| 1123 | if (out->h.error) |
| 1124 | return nbytes != reqsize ? -EINVAL : 0; |
| 1125 | |
| 1126 | reqsize += len_args(out->numargs, out->args); |
| 1127 | |
| 1128 | if (reqsize < nbytes || (reqsize > nbytes && !out->argvar)) |
| 1129 | return -EINVAL; |
| 1130 | else if (reqsize > nbytes) { |
| 1131 | struct fuse_arg *lastarg = &out->args[out->numargs-1]; |
| 1132 | unsigned diffsize = reqsize - nbytes; |
| 1133 | if (diffsize > lastarg->size) |
| 1134 | return -EINVAL; |
| 1135 | lastarg->size -= diffsize; |
| 1136 | } |
| 1137 | return fuse_copy_args(cs, out->numargs, out->argpages, out->args, |
| 1138 | out->page_zeroing); |
| 1139 | } |
| 1140 | |
| 1141 | /* |
| 1142 | * Write a single reply to a request. First the header is copied from |
| 1143 | * the write buffer. The request is then searched on the processing |
| 1144 | * list by the unique ID found in the header. If found, then remove |
| 1145 | * it from the list and copy the rest of the buffer to the request. |
| 1146 | * The request is finished by calling request_end() |
| 1147 | */ |
Miklos Szeredi | dd3bb14 | 2010-05-25 15:06:06 +0200 | [diff] [blame] | 1148 | static ssize_t fuse_dev_do_write(struct fuse_conn *fc, |
| 1149 | struct fuse_copy_state *cs, size_t nbytes) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1150 | { |
| 1151 | int err; |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1152 | struct fuse_req *req; |
| 1153 | struct fuse_out_header oh; |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1154 | |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1155 | if (nbytes < sizeof(struct fuse_out_header)) |
| 1156 | return -EINVAL; |
| 1157 | |
Miklos Szeredi | dd3bb14 | 2010-05-25 15:06:06 +0200 | [diff] [blame] | 1158 | err = fuse_copy_one(cs, &oh, sizeof(oh)); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1159 | if (err) |
| 1160 | goto err_finish; |
Tejun Heo | 8599396 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 1161 | |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1162 | err = -EINVAL; |
Tejun Heo | 8599396 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 1163 | if (oh.len != nbytes) |
| 1164 | goto err_finish; |
| 1165 | |
| 1166 | /* |
| 1167 | * Zero oh.unique indicates unsolicited notification message |
| 1168 | * and error contains notification code. |
| 1169 | */ |
| 1170 | if (!oh.unique) { |
Miklos Szeredi | dd3bb14 | 2010-05-25 15:06:06 +0200 | [diff] [blame] | 1171 | err = fuse_notify(fc, oh.error, nbytes - sizeof(oh), cs); |
Tejun Heo | 8599396 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 1172 | return err ? err : nbytes; |
| 1173 | } |
| 1174 | |
| 1175 | err = -EINVAL; |
| 1176 | if (oh.error <= -1000 || oh.error > 0) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1177 | goto err_finish; |
| 1178 | |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 1179 | spin_lock(&fc->lock); |
Miklos Szeredi | 69a53bf | 2006-01-16 22:14:41 -0800 | [diff] [blame] | 1180 | err = -ENOENT; |
| 1181 | if (!fc->connected) |
| 1182 | goto err_unlock; |
| 1183 | |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1184 | req = request_find(fc, oh.unique); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1185 | if (!req) |
| 1186 | goto err_unlock; |
| 1187 | |
Miklos Szeredi | f9a2842 | 2006-06-25 05:48:53 -0700 | [diff] [blame] | 1188 | if (req->aborted) { |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 1189 | spin_unlock(&fc->lock); |
Miklos Szeredi | dd3bb14 | 2010-05-25 15:06:06 +0200 | [diff] [blame] | 1190 | fuse_copy_finish(cs); |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 1191 | spin_lock(&fc->lock); |
Miklos Szeredi | 222f1d6 | 2006-01-16 22:14:25 -0800 | [diff] [blame] | 1192 | request_end(fc, req); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1193 | return -ENOENT; |
| 1194 | } |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 1195 | /* Is it an interrupt reply? */ |
| 1196 | if (req->intr_unique == oh.unique) { |
| 1197 | err = -EINVAL; |
| 1198 | if (nbytes != sizeof(struct fuse_out_header)) |
| 1199 | goto err_unlock; |
| 1200 | |
| 1201 | if (oh.error == -ENOSYS) |
| 1202 | fc->no_interrupt = 1; |
| 1203 | else if (oh.error == -EAGAIN) |
| 1204 | queue_interrupt(fc, req); |
| 1205 | |
| 1206 | spin_unlock(&fc->lock); |
Miklos Szeredi | dd3bb14 | 2010-05-25 15:06:06 +0200 | [diff] [blame] | 1207 | fuse_copy_finish(cs); |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 1208 | return nbytes; |
| 1209 | } |
| 1210 | |
| 1211 | req->state = FUSE_REQ_WRITING; |
Miklos Szeredi | d77a1d5 | 2006-01-16 22:14:31 -0800 | [diff] [blame] | 1212 | list_move(&req->list, &fc->io); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1213 | req->out.h = oh; |
| 1214 | req->locked = 1; |
Miklos Szeredi | dd3bb14 | 2010-05-25 15:06:06 +0200 | [diff] [blame] | 1215 | cs->req = req; |
Miklos Szeredi | ce534fb | 2010-05-25 15:06:07 +0200 | [diff] [blame^] | 1216 | if (!req->out.page_replace) |
| 1217 | cs->move_pages = 0; |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 1218 | spin_unlock(&fc->lock); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1219 | |
Miklos Szeredi | dd3bb14 | 2010-05-25 15:06:06 +0200 | [diff] [blame] | 1220 | err = copy_out_args(cs, &req->out, nbytes); |
| 1221 | fuse_copy_finish(cs); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1222 | |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 1223 | spin_lock(&fc->lock); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1224 | req->locked = 0; |
| 1225 | if (!err) { |
Miklos Szeredi | f9a2842 | 2006-06-25 05:48:53 -0700 | [diff] [blame] | 1226 | if (req->aborted) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1227 | err = -ENOENT; |
Miklos Szeredi | f9a2842 | 2006-06-25 05:48:53 -0700 | [diff] [blame] | 1228 | } else if (!req->aborted) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1229 | req->out.h.error = -EIO; |
| 1230 | request_end(fc, req); |
| 1231 | |
| 1232 | return err ? err : nbytes; |
| 1233 | |
| 1234 | err_unlock: |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 1235 | spin_unlock(&fc->lock); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1236 | err_finish: |
Miklos Szeredi | dd3bb14 | 2010-05-25 15:06:06 +0200 | [diff] [blame] | 1237 | fuse_copy_finish(cs); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1238 | return err; |
| 1239 | } |
| 1240 | |
Miklos Szeredi | dd3bb14 | 2010-05-25 15:06:06 +0200 | [diff] [blame] | 1241 | static ssize_t fuse_dev_write(struct kiocb *iocb, const struct iovec *iov, |
| 1242 | unsigned long nr_segs, loff_t pos) |
| 1243 | { |
| 1244 | struct fuse_copy_state cs; |
| 1245 | struct fuse_conn *fc = fuse_get_conn(iocb->ki_filp); |
| 1246 | if (!fc) |
| 1247 | return -EPERM; |
| 1248 | |
| 1249 | fuse_copy_init(&cs, fc, 0, NULL, iov, nr_segs); |
| 1250 | |
| 1251 | return fuse_dev_do_write(fc, &cs, iov_length(iov, nr_segs)); |
| 1252 | } |
| 1253 | |
| 1254 | static ssize_t fuse_dev_splice_write(struct pipe_inode_info *pipe, |
| 1255 | struct file *out, loff_t *ppos, |
| 1256 | size_t len, unsigned int flags) |
| 1257 | { |
| 1258 | unsigned nbuf; |
| 1259 | unsigned idx; |
| 1260 | struct pipe_buffer *bufs; |
| 1261 | struct fuse_copy_state cs; |
| 1262 | struct fuse_conn *fc; |
| 1263 | size_t rem; |
| 1264 | ssize_t ret; |
| 1265 | |
| 1266 | fc = fuse_get_conn(out); |
| 1267 | if (!fc) |
| 1268 | return -EPERM; |
| 1269 | |
| 1270 | bufs = kmalloc(pipe->buffers * sizeof (struct pipe_buffer), GFP_KERNEL); |
| 1271 | if (!bufs) |
| 1272 | return -ENOMEM; |
| 1273 | |
| 1274 | pipe_lock(pipe); |
| 1275 | nbuf = 0; |
| 1276 | rem = 0; |
| 1277 | for (idx = 0; idx < pipe->nrbufs && rem < len; idx++) |
| 1278 | rem += pipe->bufs[(pipe->curbuf + idx) & (pipe->buffers - 1)].len; |
| 1279 | |
| 1280 | ret = -EINVAL; |
| 1281 | if (rem < len) { |
| 1282 | pipe_unlock(pipe); |
| 1283 | goto out; |
| 1284 | } |
| 1285 | |
| 1286 | rem = len; |
| 1287 | while (rem) { |
| 1288 | struct pipe_buffer *ibuf; |
| 1289 | struct pipe_buffer *obuf; |
| 1290 | |
| 1291 | BUG_ON(nbuf >= pipe->buffers); |
| 1292 | BUG_ON(!pipe->nrbufs); |
| 1293 | ibuf = &pipe->bufs[pipe->curbuf]; |
| 1294 | obuf = &bufs[nbuf]; |
| 1295 | |
| 1296 | if (rem >= ibuf->len) { |
| 1297 | *obuf = *ibuf; |
| 1298 | ibuf->ops = NULL; |
| 1299 | pipe->curbuf = (pipe->curbuf + 1) & (pipe->buffers - 1); |
| 1300 | pipe->nrbufs--; |
| 1301 | } else { |
| 1302 | ibuf->ops->get(pipe, ibuf); |
| 1303 | *obuf = *ibuf; |
| 1304 | obuf->flags &= ~PIPE_BUF_FLAG_GIFT; |
| 1305 | obuf->len = rem; |
| 1306 | ibuf->offset += obuf->len; |
| 1307 | ibuf->len -= obuf->len; |
| 1308 | } |
| 1309 | nbuf++; |
| 1310 | rem -= obuf->len; |
| 1311 | } |
| 1312 | pipe_unlock(pipe); |
| 1313 | |
| 1314 | memset(&cs, 0, sizeof(struct fuse_copy_state)); |
| 1315 | cs.fc = fc; |
| 1316 | cs.write = 0; |
| 1317 | cs.pipebufs = bufs; |
| 1318 | cs.nr_segs = nbuf; |
| 1319 | cs.pipe = pipe; |
| 1320 | |
Miklos Szeredi | ce534fb | 2010-05-25 15:06:07 +0200 | [diff] [blame^] | 1321 | if (flags & SPLICE_F_MOVE) |
| 1322 | cs.move_pages = 1; |
| 1323 | |
Miklos Szeredi | dd3bb14 | 2010-05-25 15:06:06 +0200 | [diff] [blame] | 1324 | ret = fuse_dev_do_write(fc, &cs, len); |
| 1325 | |
| 1326 | for (idx = 0; idx < nbuf; idx++) { |
| 1327 | struct pipe_buffer *buf = &bufs[idx]; |
| 1328 | buf->ops->release(pipe, buf); |
| 1329 | } |
| 1330 | out: |
| 1331 | kfree(bufs); |
| 1332 | return ret; |
| 1333 | } |
| 1334 | |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1335 | static unsigned fuse_dev_poll(struct file *file, poll_table *wait) |
| 1336 | { |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1337 | unsigned mask = POLLOUT | POLLWRNORM; |
Miklos Szeredi | 7025d9a | 2006-04-10 22:54:50 -0700 | [diff] [blame] | 1338 | struct fuse_conn *fc = fuse_get_conn(file); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1339 | if (!fc) |
Miklos Szeredi | 7025d9a | 2006-04-10 22:54:50 -0700 | [diff] [blame] | 1340 | return POLLERR; |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1341 | |
| 1342 | poll_wait(file, &fc->waitq, wait); |
| 1343 | |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 1344 | spin_lock(&fc->lock); |
Miklos Szeredi | 7025d9a | 2006-04-10 22:54:50 -0700 | [diff] [blame] | 1345 | if (!fc->connected) |
| 1346 | mask = POLLERR; |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 1347 | else if (request_pending(fc)) |
Miklos Szeredi | 7025d9a | 2006-04-10 22:54:50 -0700 | [diff] [blame] | 1348 | mask |= POLLIN | POLLRDNORM; |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 1349 | spin_unlock(&fc->lock); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1350 | |
| 1351 | return mask; |
| 1352 | } |
| 1353 | |
Miklos Szeredi | 69a53bf | 2006-01-16 22:14:41 -0800 | [diff] [blame] | 1354 | /* |
| 1355 | * Abort all requests on the given list (pending or processing) |
| 1356 | * |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 1357 | * This function releases and reacquires fc->lock |
Miklos Szeredi | 69a53bf | 2006-01-16 22:14:41 -0800 | [diff] [blame] | 1358 | */ |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1359 | static void end_requests(struct fuse_conn *fc, struct list_head *head) |
Harvey Harrison | 5d9ec85 | 2008-12-02 14:49:42 +0100 | [diff] [blame] | 1360 | __releases(&fc->lock) |
| 1361 | __acquires(&fc->lock) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1362 | { |
| 1363 | while (!list_empty(head)) { |
| 1364 | struct fuse_req *req; |
| 1365 | req = list_entry(head->next, struct fuse_req, list); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1366 | req->out.h.error = -ECONNABORTED; |
| 1367 | request_end(fc, req); |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 1368 | spin_lock(&fc->lock); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1369 | } |
| 1370 | } |
| 1371 | |
Miklos Szeredi | 69a53bf | 2006-01-16 22:14:41 -0800 | [diff] [blame] | 1372 | /* |
| 1373 | * Abort requests under I/O |
| 1374 | * |
Miklos Szeredi | f9a2842 | 2006-06-25 05:48:53 -0700 | [diff] [blame] | 1375 | * The requests are set to aborted and finished, and the request |
Miklos Szeredi | 69a53bf | 2006-01-16 22:14:41 -0800 | [diff] [blame] | 1376 | * waiter is woken up. This will make request_wait_answer() wait |
| 1377 | * until the request is unlocked and then return. |
Miklos Szeredi | 64c6d8e | 2006-01-16 22:14:42 -0800 | [diff] [blame] | 1378 | * |
| 1379 | * If the request is asynchronous, then the end function needs to be |
| 1380 | * called after waiting for the request to be unlocked (if it was |
| 1381 | * locked). |
Miklos Szeredi | 69a53bf | 2006-01-16 22:14:41 -0800 | [diff] [blame] | 1382 | */ |
| 1383 | static void end_io_requests(struct fuse_conn *fc) |
Harvey Harrison | 5d9ec85 | 2008-12-02 14:49:42 +0100 | [diff] [blame] | 1384 | __releases(&fc->lock) |
| 1385 | __acquires(&fc->lock) |
Miklos Szeredi | 69a53bf | 2006-01-16 22:14:41 -0800 | [diff] [blame] | 1386 | { |
| 1387 | while (!list_empty(&fc->io)) { |
Miklos Szeredi | 64c6d8e | 2006-01-16 22:14:42 -0800 | [diff] [blame] | 1388 | struct fuse_req *req = |
| 1389 | list_entry(fc->io.next, struct fuse_req, list); |
| 1390 | void (*end) (struct fuse_conn *, struct fuse_req *) = req->end; |
| 1391 | |
Miklos Szeredi | f9a2842 | 2006-06-25 05:48:53 -0700 | [diff] [blame] | 1392 | req->aborted = 1; |
Miklos Szeredi | 69a53bf | 2006-01-16 22:14:41 -0800 | [diff] [blame] | 1393 | req->out.h.error = -ECONNABORTED; |
| 1394 | req->state = FUSE_REQ_FINISHED; |
| 1395 | list_del_init(&req->list); |
| 1396 | wake_up(&req->waitq); |
Miklos Szeredi | 64c6d8e | 2006-01-16 22:14:42 -0800 | [diff] [blame] | 1397 | if (end) { |
| 1398 | req->end = NULL; |
Miklos Szeredi | 64c6d8e | 2006-01-16 22:14:42 -0800 | [diff] [blame] | 1399 | __fuse_get_request(req); |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 1400 | spin_unlock(&fc->lock); |
Miklos Szeredi | 64c6d8e | 2006-01-16 22:14:42 -0800 | [diff] [blame] | 1401 | wait_event(req->waitq, !req->locked); |
| 1402 | end(fc, req); |
Tejun Heo | e9bb09d | 2008-11-26 12:03:54 +0100 | [diff] [blame] | 1403 | fuse_put_request(fc, req); |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 1404 | spin_lock(&fc->lock); |
Miklos Szeredi | 64c6d8e | 2006-01-16 22:14:42 -0800 | [diff] [blame] | 1405 | } |
Miklos Szeredi | 69a53bf | 2006-01-16 22:14:41 -0800 | [diff] [blame] | 1406 | } |
| 1407 | } |
| 1408 | |
| 1409 | /* |
| 1410 | * Abort all requests. |
| 1411 | * |
| 1412 | * Emergency exit in case of a malicious or accidental deadlock, or |
| 1413 | * just a hung filesystem. |
| 1414 | * |
| 1415 | * The same effect is usually achievable through killing the |
| 1416 | * filesystem daemon and all users of the filesystem. The exception |
| 1417 | * is the combination of an asynchronous request and the tricky |
| 1418 | * deadlock (see Documentation/filesystems/fuse.txt). |
| 1419 | * |
| 1420 | * During the aborting, progression of requests from the pending and |
| 1421 | * processing lists onto the io list, and progression of new requests |
| 1422 | * onto the pending list is prevented by req->connected being false. |
| 1423 | * |
| 1424 | * Progression of requests under I/O to the processing list is |
Miklos Szeredi | f9a2842 | 2006-06-25 05:48:53 -0700 | [diff] [blame] | 1425 | * prevented by the req->aborted flag being true for these requests. |
| 1426 | * For this reason requests on the io list must be aborted first. |
Miklos Szeredi | 69a53bf | 2006-01-16 22:14:41 -0800 | [diff] [blame] | 1427 | */ |
| 1428 | void fuse_abort_conn(struct fuse_conn *fc) |
| 1429 | { |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 1430 | spin_lock(&fc->lock); |
Miklos Szeredi | 69a53bf | 2006-01-16 22:14:41 -0800 | [diff] [blame] | 1431 | if (fc->connected) { |
| 1432 | fc->connected = 0; |
Miklos Szeredi | 51eb01e | 2006-06-25 05:48:50 -0700 | [diff] [blame] | 1433 | fc->blocked = 0; |
Miklos Szeredi | 69a53bf | 2006-01-16 22:14:41 -0800 | [diff] [blame] | 1434 | end_io_requests(fc); |
| 1435 | end_requests(fc, &fc->pending); |
| 1436 | end_requests(fc, &fc->processing); |
| 1437 | wake_up_all(&fc->waitq); |
Miklos Szeredi | 51eb01e | 2006-06-25 05:48:50 -0700 | [diff] [blame] | 1438 | wake_up_all(&fc->blocked_waitq); |
Jeff Dike | 385a17b | 2006-04-10 22:54:52 -0700 | [diff] [blame] | 1439 | kill_fasync(&fc->fasync, SIGIO, POLL_IN); |
Miklos Szeredi | 69a53bf | 2006-01-16 22:14:41 -0800 | [diff] [blame] | 1440 | } |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 1441 | spin_unlock(&fc->lock); |
Miklos Szeredi | 69a53bf | 2006-01-16 22:14:41 -0800 | [diff] [blame] | 1442 | } |
Tejun Heo | 08cbf54 | 2009-04-14 10:54:53 +0900 | [diff] [blame] | 1443 | EXPORT_SYMBOL_GPL(fuse_abort_conn); |
Miklos Szeredi | 69a53bf | 2006-01-16 22:14:41 -0800 | [diff] [blame] | 1444 | |
Tejun Heo | 08cbf54 | 2009-04-14 10:54:53 +0900 | [diff] [blame] | 1445 | int fuse_dev_release(struct inode *inode, struct file *file) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1446 | { |
Miklos Szeredi | 0720b31 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 1447 | struct fuse_conn *fc = fuse_get_conn(file); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1448 | if (fc) { |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 1449 | spin_lock(&fc->lock); |
Miklos Szeredi | 1e9a4ed | 2005-09-09 13:10:31 -0700 | [diff] [blame] | 1450 | fc->connected = 0; |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1451 | end_requests(fc, &fc->pending); |
| 1452 | end_requests(fc, &fc->processing); |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 1453 | spin_unlock(&fc->lock); |
Miklos Szeredi | bafa965 | 2006-06-25 05:48:51 -0700 | [diff] [blame] | 1454 | fuse_conn_put(fc); |
Jeff Dike | 385a17b | 2006-04-10 22:54:52 -0700 | [diff] [blame] | 1455 | } |
Miklos Szeredi | f543f25 | 2006-01-16 22:14:35 -0800 | [diff] [blame] | 1456 | |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1457 | return 0; |
| 1458 | } |
Tejun Heo | 08cbf54 | 2009-04-14 10:54:53 +0900 | [diff] [blame] | 1459 | EXPORT_SYMBOL_GPL(fuse_dev_release); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1460 | |
Jeff Dike | 385a17b | 2006-04-10 22:54:52 -0700 | [diff] [blame] | 1461 | static int fuse_dev_fasync(int fd, struct file *file, int on) |
| 1462 | { |
| 1463 | struct fuse_conn *fc = fuse_get_conn(file); |
| 1464 | if (!fc) |
Miklos Szeredi | a87046d | 2006-04-10 22:54:56 -0700 | [diff] [blame] | 1465 | return -EPERM; |
Jeff Dike | 385a17b | 2006-04-10 22:54:52 -0700 | [diff] [blame] | 1466 | |
| 1467 | /* No locking - fasync_helper does its own locking */ |
| 1468 | return fasync_helper(fd, file, on, &fc->fasync); |
| 1469 | } |
| 1470 | |
Arjan van de Ven | 4b6f5d2 | 2006-03-28 01:56:42 -0800 | [diff] [blame] | 1471 | const struct file_operations fuse_dev_operations = { |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1472 | .owner = THIS_MODULE, |
| 1473 | .llseek = no_llseek, |
Badari Pulavarty | ee0b3e6 | 2006-09-30 23:28:47 -0700 | [diff] [blame] | 1474 | .read = do_sync_read, |
| 1475 | .aio_read = fuse_dev_read, |
| 1476 | .write = do_sync_write, |
| 1477 | .aio_write = fuse_dev_write, |
Miklos Szeredi | dd3bb14 | 2010-05-25 15:06:06 +0200 | [diff] [blame] | 1478 | .splice_write = fuse_dev_splice_write, |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1479 | .poll = fuse_dev_poll, |
| 1480 | .release = fuse_dev_release, |
Jeff Dike | 385a17b | 2006-04-10 22:54:52 -0700 | [diff] [blame] | 1481 | .fasync = fuse_dev_fasync, |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1482 | }; |
Tejun Heo | 08cbf54 | 2009-04-14 10:54:53 +0900 | [diff] [blame] | 1483 | EXPORT_SYMBOL_GPL(fuse_dev_operations); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1484 | |
| 1485 | static struct miscdevice fuse_miscdevice = { |
| 1486 | .minor = FUSE_MINOR, |
| 1487 | .name = "fuse", |
| 1488 | .fops = &fuse_dev_operations, |
| 1489 | }; |
| 1490 | |
| 1491 | int __init fuse_dev_init(void) |
| 1492 | { |
| 1493 | int err = -ENOMEM; |
| 1494 | fuse_req_cachep = kmem_cache_create("fuse_request", |
| 1495 | sizeof(struct fuse_req), |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 1496 | 0, 0, NULL); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1497 | if (!fuse_req_cachep) |
| 1498 | goto out; |
| 1499 | |
| 1500 | err = misc_register(&fuse_miscdevice); |
| 1501 | if (err) |
| 1502 | goto out_cache_clean; |
| 1503 | |
| 1504 | return 0; |
| 1505 | |
| 1506 | out_cache_clean: |
| 1507 | kmem_cache_destroy(fuse_req_cachep); |
| 1508 | out: |
| 1509 | return err; |
| 1510 | } |
| 1511 | |
| 1512 | void fuse_dev_cleanup(void) |
| 1513 | { |
| 1514 | misc_deregister(&fuse_miscdevice); |
| 1515 | kmem_cache_destroy(fuse_req_cachep); |
| 1516 | } |