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 | { |
Miklos Szeredi | d12def1 | 2008-02-06 01:38:39 -0800 | [diff] [blame] | 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++; |
Miklos Szeredi | 2d45ba3 | 2010-07-12 14:41:40 +0200 | [diff] [blame] | 263 | req->in.h.unique = fuse_get_unique(fc); |
Miklos Szeredi | d12def1 | 2008-02-06 01:38:39 -0800 | [diff] [blame] | 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) |
Miklos Szeredi | b9ca67b | 2010-09-07 13:42:41 +0200 | [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) |
Miklos Szeredi | b9ca67b | 2010-09-07 13:42:41 +0200 | [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) |
Miklos Szeredi | b9ca67b | 2010-09-07 13:42:41 +0200 | [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 { |
Miklos Szeredi | 2d45ba3 | 2010-07-12 14:41:40 +0200 | [diff] [blame] | 401 | req->in.h.unique = fuse_get_unique(fc); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 402 | queue_request(fc, req); |
| 403 | /* acquire extra reference, since request is still needed |
| 404 | after request_end() */ |
| 405 | __fuse_get_request(req); |
| 406 | |
Miklos Szeredi | 7c352bd | 2005-09-09 13:10:39 -0700 | [diff] [blame] | 407 | request_wait_answer(fc, req); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 408 | } |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 409 | spin_unlock(&fc->lock); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 410 | } |
Tejun Heo | 08cbf54 | 2009-04-14 10:54:53 +0900 | [diff] [blame] | 411 | EXPORT_SYMBOL_GPL(fuse_request_send); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 412 | |
Tejun Heo | b93f858 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 413 | static void fuse_request_send_nowait_locked(struct fuse_conn *fc, |
| 414 | struct fuse_req *req) |
Miklos Szeredi | d12def1 | 2008-02-06 01:38:39 -0800 | [diff] [blame] | 415 | { |
| 416 | req->background = 1; |
| 417 | fc->num_background++; |
Csaba Henk | 7a6d3c8 | 2009-07-01 17:28:41 -0700 | [diff] [blame] | 418 | if (fc->num_background == fc->max_background) |
Miklos Szeredi | d12def1 | 2008-02-06 01:38:39 -0800 | [diff] [blame] | 419 | fc->blocked = 1; |
Csaba Henk | 7a6d3c8 | 2009-07-01 17:28:41 -0700 | [diff] [blame] | 420 | if (fc->num_background == fc->congestion_threshold && |
Tejun Heo | a325f9b | 2009-04-14 10:54:52 +0900 | [diff] [blame] | 421 | fc->bdi_initialized) { |
Jens Axboe | 8aa7e84 | 2009-07-09 14:52:32 +0200 | [diff] [blame] | 422 | set_bdi_congested(&fc->bdi, BLK_RW_SYNC); |
| 423 | set_bdi_congested(&fc->bdi, BLK_RW_ASYNC); |
Miklos Szeredi | d12def1 | 2008-02-06 01:38:39 -0800 | [diff] [blame] | 424 | } |
| 425 | list_add_tail(&req->list, &fc->bg_queue); |
| 426 | flush_bg_queue(fc); |
| 427 | } |
| 428 | |
Tejun Heo | b93f858 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 429 | 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] | 430 | { |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 431 | spin_lock(&fc->lock); |
Miklos Szeredi | 1e9a4ed | 2005-09-09 13:10:31 -0700 | [diff] [blame] | 432 | if (fc->connected) { |
Tejun Heo | b93f858 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 433 | fuse_request_send_nowait_locked(fc, req); |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 434 | spin_unlock(&fc->lock); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 435 | } else { |
| 436 | req->out.h.error = -ENOTCONN; |
| 437 | request_end(fc, req); |
| 438 | } |
| 439 | } |
| 440 | |
Tejun Heo | b93f858 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 441 | 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] | 442 | { |
| 443 | req->isreply = 0; |
Tejun Heo | b93f858 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 444 | fuse_request_send_nowait(fc, req); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 445 | } |
| 446 | |
Tejun Heo | b93f858 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 447 | 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] | 448 | { |
| 449 | req->isreply = 1; |
Tejun Heo | b93f858 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 450 | fuse_request_send_nowait(fc, req); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 451 | } |
Tejun Heo | 08cbf54 | 2009-04-14 10:54:53 +0900 | [diff] [blame] | 452 | EXPORT_SYMBOL_GPL(fuse_request_send_background); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 453 | |
Miklos Szeredi | 2d45ba3 | 2010-07-12 14:41:40 +0200 | [diff] [blame] | 454 | static int fuse_request_send_notify_reply(struct fuse_conn *fc, |
| 455 | struct fuse_req *req, u64 unique) |
| 456 | { |
| 457 | int err = -ENODEV; |
| 458 | |
| 459 | req->isreply = 0; |
| 460 | req->in.h.unique = unique; |
| 461 | spin_lock(&fc->lock); |
| 462 | if (fc->connected) { |
| 463 | queue_request(fc, req); |
| 464 | err = 0; |
| 465 | } |
| 466 | spin_unlock(&fc->lock); |
| 467 | |
| 468 | return err; |
| 469 | } |
| 470 | |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 471 | /* |
Miklos Szeredi | 3be5a52 | 2008-04-30 00:54:41 -0700 | [diff] [blame] | 472 | * Called under fc->lock |
| 473 | * |
| 474 | * fc->connected must have been checked previously |
| 475 | */ |
Tejun Heo | b93f858 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 476 | void fuse_request_send_background_locked(struct fuse_conn *fc, |
| 477 | struct fuse_req *req) |
Miklos Szeredi | 3be5a52 | 2008-04-30 00:54:41 -0700 | [diff] [blame] | 478 | { |
| 479 | req->isreply = 1; |
Tejun Heo | b93f858 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 480 | fuse_request_send_nowait_locked(fc, req); |
Miklos Szeredi | 3be5a52 | 2008-04-30 00:54:41 -0700 | [diff] [blame] | 481 | } |
| 482 | |
| 483 | /* |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 484 | * Lock the request. Up to the next unlock_request() there mustn't be |
| 485 | * anything that could cause a page-fault. If the request was already |
Miklos Szeredi | f9a2842 | 2006-06-25 05:48:53 -0700 | [diff] [blame] | 486 | * aborted bail out. |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 487 | */ |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 488 | static int lock_request(struct fuse_conn *fc, struct fuse_req *req) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 489 | { |
| 490 | int err = 0; |
| 491 | if (req) { |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 492 | spin_lock(&fc->lock); |
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 | err = -ENOENT; |
| 495 | else |
| 496 | req->locked = 1; |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 497 | spin_unlock(&fc->lock); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 498 | } |
| 499 | return err; |
| 500 | } |
| 501 | |
| 502 | /* |
Miklos Szeredi | f9a2842 | 2006-06-25 05:48:53 -0700 | [diff] [blame] | 503 | * Unlock request. If it was aborted during being locked, the |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 504 | * requester thread is currently waiting for it to be unlocked, so |
| 505 | * wake it up. |
| 506 | */ |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 507 | static void unlock_request(struct fuse_conn *fc, struct fuse_req *req) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 508 | { |
| 509 | if (req) { |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 510 | spin_lock(&fc->lock); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 511 | req->locked = 0; |
Miklos Szeredi | f9a2842 | 2006-06-25 05:48:53 -0700 | [diff] [blame] | 512 | if (req->aborted) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 513 | wake_up(&req->waitq); |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 514 | spin_unlock(&fc->lock); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 515 | } |
| 516 | } |
| 517 | |
| 518 | struct fuse_copy_state { |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 519 | struct fuse_conn *fc; |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 520 | int write; |
| 521 | struct fuse_req *req; |
| 522 | const struct iovec *iov; |
Miklos Szeredi | dd3bb14 | 2010-05-25 15:06:06 +0200 | [diff] [blame] | 523 | struct pipe_buffer *pipebufs; |
| 524 | struct pipe_buffer *currbuf; |
| 525 | struct pipe_inode_info *pipe; |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 526 | unsigned long nr_segs; |
| 527 | unsigned long seglen; |
| 528 | unsigned long addr; |
| 529 | struct page *pg; |
| 530 | void *mapaddr; |
| 531 | void *buf; |
| 532 | unsigned len; |
Miklos Szeredi | ce534fb | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 533 | unsigned move_pages:1; |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 534 | }; |
| 535 | |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 536 | 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] | 537 | int write, |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 538 | const struct iovec *iov, unsigned long nr_segs) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 539 | { |
| 540 | memset(cs, 0, sizeof(*cs)); |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 541 | cs->fc = fc; |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 542 | cs->write = write; |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 543 | cs->iov = iov; |
| 544 | cs->nr_segs = nr_segs; |
| 545 | } |
| 546 | |
| 547 | /* Unmap and put previous page of userspace buffer */ |
Miklos Szeredi | 8bfc016 | 2006-01-16 22:14:28 -0800 | [diff] [blame] | 548 | static void fuse_copy_finish(struct fuse_copy_state *cs) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 549 | { |
Miklos Szeredi | dd3bb14 | 2010-05-25 15:06:06 +0200 | [diff] [blame] | 550 | if (cs->currbuf) { |
| 551 | struct pipe_buffer *buf = cs->currbuf; |
| 552 | |
Miklos Szeredi | c302162 | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 553 | if (!cs->write) { |
| 554 | buf->ops->unmap(cs->pipe, buf, cs->mapaddr); |
| 555 | } else { |
Miklos Szeredi | 7909b1c | 2010-07-12 14:41:40 +0200 | [diff] [blame] | 556 | kunmap(buf->page); |
Miklos Szeredi | c302162 | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 557 | buf->len = PAGE_SIZE - cs->len; |
| 558 | } |
Miklos Szeredi | dd3bb14 | 2010-05-25 15:06:06 +0200 | [diff] [blame] | 559 | cs->currbuf = NULL; |
| 560 | cs->mapaddr = NULL; |
| 561 | } else if (cs->mapaddr) { |
Miklos Szeredi | 7909b1c | 2010-07-12 14:41:40 +0200 | [diff] [blame] | 562 | kunmap(cs->pg); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 563 | if (cs->write) { |
| 564 | flush_dcache_page(cs->pg); |
| 565 | set_page_dirty_lock(cs->pg); |
| 566 | } |
| 567 | put_page(cs->pg); |
| 568 | cs->mapaddr = NULL; |
| 569 | } |
| 570 | } |
| 571 | |
| 572 | /* |
| 573 | * Get another pagefull of userspace buffer, and map it to kernel |
| 574 | * address space, and lock request |
| 575 | */ |
| 576 | static int fuse_copy_fill(struct fuse_copy_state *cs) |
| 577 | { |
| 578 | unsigned long offset; |
| 579 | int err; |
| 580 | |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 581 | unlock_request(cs->fc, cs->req); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 582 | fuse_copy_finish(cs); |
Miklos Szeredi | dd3bb14 | 2010-05-25 15:06:06 +0200 | [diff] [blame] | 583 | if (cs->pipebufs) { |
| 584 | struct pipe_buffer *buf = cs->pipebufs; |
| 585 | |
Miklos Szeredi | c302162 | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 586 | if (!cs->write) { |
| 587 | err = buf->ops->confirm(cs->pipe, buf); |
| 588 | if (err) |
| 589 | return err; |
Miklos Szeredi | dd3bb14 | 2010-05-25 15:06:06 +0200 | [diff] [blame] | 590 | |
Miklos Szeredi | c302162 | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 591 | BUG_ON(!cs->nr_segs); |
| 592 | cs->currbuf = buf; |
Miklos Szeredi | 7909b1c | 2010-07-12 14:41:40 +0200 | [diff] [blame] | 593 | cs->mapaddr = buf->ops->map(cs->pipe, buf, 0); |
Miklos Szeredi | c302162 | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 594 | cs->len = buf->len; |
| 595 | cs->buf = cs->mapaddr + buf->offset; |
| 596 | cs->pipebufs++; |
| 597 | cs->nr_segs--; |
| 598 | } else { |
| 599 | struct page *page; |
| 600 | |
| 601 | if (cs->nr_segs == cs->pipe->buffers) |
| 602 | return -EIO; |
| 603 | |
| 604 | page = alloc_page(GFP_HIGHUSER); |
| 605 | if (!page) |
| 606 | return -ENOMEM; |
| 607 | |
| 608 | buf->page = page; |
| 609 | buf->offset = 0; |
| 610 | buf->len = 0; |
| 611 | |
| 612 | cs->currbuf = buf; |
Miklos Szeredi | 7909b1c | 2010-07-12 14:41:40 +0200 | [diff] [blame] | 613 | cs->mapaddr = kmap(page); |
Miklos Szeredi | c302162 | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 614 | cs->buf = cs->mapaddr; |
| 615 | cs->len = PAGE_SIZE; |
| 616 | cs->pipebufs++; |
| 617 | cs->nr_segs++; |
| 618 | } |
Miklos Szeredi | dd3bb14 | 2010-05-25 15:06:06 +0200 | [diff] [blame] | 619 | } else { |
| 620 | if (!cs->seglen) { |
| 621 | BUG_ON(!cs->nr_segs); |
| 622 | cs->seglen = cs->iov[0].iov_len; |
| 623 | cs->addr = (unsigned long) cs->iov[0].iov_base; |
| 624 | cs->iov++; |
| 625 | cs->nr_segs--; |
| 626 | } |
| 627 | err = get_user_pages_fast(cs->addr, 1, cs->write, &cs->pg); |
| 628 | if (err < 0) |
| 629 | return err; |
| 630 | BUG_ON(err != 1); |
| 631 | offset = cs->addr % PAGE_SIZE; |
Miklos Szeredi | 7909b1c | 2010-07-12 14:41:40 +0200 | [diff] [blame] | 632 | cs->mapaddr = kmap(cs->pg); |
Miklos Szeredi | dd3bb14 | 2010-05-25 15:06:06 +0200 | [diff] [blame] | 633 | cs->buf = cs->mapaddr + offset; |
| 634 | cs->len = min(PAGE_SIZE - offset, cs->seglen); |
| 635 | cs->seglen -= cs->len; |
| 636 | cs->addr += cs->len; |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 637 | } |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 638 | |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 639 | return lock_request(cs->fc, cs->req); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 640 | } |
| 641 | |
| 642 | /* Do as much copy to/from userspace buffer as we can */ |
Miklos Szeredi | 8bfc016 | 2006-01-16 22:14:28 -0800 | [diff] [blame] | 643 | 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] | 644 | { |
| 645 | unsigned ncpy = min(*size, cs->len); |
| 646 | if (val) { |
| 647 | if (cs->write) |
| 648 | memcpy(cs->buf, *val, ncpy); |
| 649 | else |
| 650 | memcpy(*val, cs->buf, ncpy); |
| 651 | *val += ncpy; |
| 652 | } |
| 653 | *size -= ncpy; |
| 654 | cs->len -= ncpy; |
| 655 | cs->buf += ncpy; |
| 656 | return ncpy; |
| 657 | } |
| 658 | |
Miklos Szeredi | ce534fb | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 659 | static int fuse_check_page(struct page *page) |
| 660 | { |
| 661 | if (page_mapcount(page) || |
| 662 | page->mapping != NULL || |
| 663 | page_count(page) != 1 || |
| 664 | (page->flags & PAGE_FLAGS_CHECK_AT_PREP & |
| 665 | ~(1 << PG_locked | |
| 666 | 1 << PG_referenced | |
| 667 | 1 << PG_uptodate | |
| 668 | 1 << PG_lru | |
| 669 | 1 << PG_active | |
| 670 | 1 << PG_reclaim))) { |
| 671 | printk(KERN_WARNING "fuse: trying to steal weird page\n"); |
| 672 | 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); |
| 673 | return 1; |
| 674 | } |
| 675 | return 0; |
| 676 | } |
| 677 | |
| 678 | static int fuse_try_move_page(struct fuse_copy_state *cs, struct page **pagep) |
| 679 | { |
| 680 | int err; |
| 681 | struct page *oldpage = *pagep; |
| 682 | struct page *newpage; |
| 683 | struct pipe_buffer *buf = cs->pipebufs; |
| 684 | struct address_space *mapping; |
| 685 | pgoff_t index; |
| 686 | |
| 687 | unlock_request(cs->fc, cs->req); |
| 688 | fuse_copy_finish(cs); |
| 689 | |
| 690 | err = buf->ops->confirm(cs->pipe, buf); |
| 691 | if (err) |
| 692 | return err; |
| 693 | |
| 694 | BUG_ON(!cs->nr_segs); |
| 695 | cs->currbuf = buf; |
| 696 | cs->len = buf->len; |
| 697 | cs->pipebufs++; |
| 698 | cs->nr_segs--; |
| 699 | |
| 700 | if (cs->len != PAGE_SIZE) |
| 701 | goto out_fallback; |
| 702 | |
| 703 | if (buf->ops->steal(cs->pipe, buf) != 0) |
| 704 | goto out_fallback; |
| 705 | |
| 706 | newpage = buf->page; |
| 707 | |
| 708 | if (WARN_ON(!PageUptodate(newpage))) |
| 709 | return -EIO; |
| 710 | |
| 711 | ClearPageMappedToDisk(newpage); |
| 712 | |
| 713 | if (fuse_check_page(newpage) != 0) |
| 714 | goto out_fallback_unlock; |
| 715 | |
| 716 | mapping = oldpage->mapping; |
| 717 | index = oldpage->index; |
| 718 | |
| 719 | /* |
| 720 | * This is a new and locked page, it shouldn't be mapped or |
| 721 | * have any special flags on it |
| 722 | */ |
| 723 | if (WARN_ON(page_mapped(oldpage))) |
| 724 | goto out_fallback_unlock; |
| 725 | if (WARN_ON(page_has_private(oldpage))) |
| 726 | goto out_fallback_unlock; |
| 727 | if (WARN_ON(PageDirty(oldpage) || PageWriteback(oldpage))) |
| 728 | goto out_fallback_unlock; |
| 729 | if (WARN_ON(PageMlocked(oldpage))) |
| 730 | goto out_fallback_unlock; |
| 731 | |
| 732 | remove_from_page_cache(oldpage); |
| 733 | page_cache_release(oldpage); |
| 734 | |
| 735 | err = add_to_page_cache_locked(newpage, mapping, index, GFP_KERNEL); |
| 736 | if (err) { |
| 737 | printk(KERN_WARNING "fuse_try_move_page: failed to add page"); |
| 738 | goto out_fallback_unlock; |
| 739 | } |
| 740 | page_cache_get(newpage); |
| 741 | |
| 742 | if (!(buf->flags & PIPE_BUF_FLAG_LRU)) |
| 743 | lru_cache_add_file(newpage); |
| 744 | |
| 745 | err = 0; |
| 746 | spin_lock(&cs->fc->lock); |
| 747 | if (cs->req->aborted) |
| 748 | err = -ENOENT; |
| 749 | else |
| 750 | *pagep = newpage; |
| 751 | spin_unlock(&cs->fc->lock); |
| 752 | |
| 753 | if (err) { |
| 754 | unlock_page(newpage); |
| 755 | page_cache_release(newpage); |
| 756 | return err; |
| 757 | } |
| 758 | |
| 759 | unlock_page(oldpage); |
| 760 | page_cache_release(oldpage); |
| 761 | cs->len = 0; |
| 762 | |
| 763 | return 0; |
| 764 | |
| 765 | out_fallback_unlock: |
| 766 | unlock_page(newpage); |
| 767 | out_fallback: |
| 768 | cs->mapaddr = buf->ops->map(cs->pipe, buf, 1); |
| 769 | cs->buf = cs->mapaddr + buf->offset; |
| 770 | |
| 771 | err = lock_request(cs->fc, cs->req); |
| 772 | if (err) |
| 773 | return err; |
| 774 | |
| 775 | return 1; |
| 776 | } |
| 777 | |
Miklos Szeredi | c302162 | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 778 | static int fuse_ref_page(struct fuse_copy_state *cs, struct page *page, |
| 779 | unsigned offset, unsigned count) |
| 780 | { |
| 781 | struct pipe_buffer *buf; |
| 782 | |
| 783 | if (cs->nr_segs == cs->pipe->buffers) |
| 784 | return -EIO; |
| 785 | |
| 786 | unlock_request(cs->fc, cs->req); |
| 787 | fuse_copy_finish(cs); |
| 788 | |
| 789 | buf = cs->pipebufs; |
| 790 | page_cache_get(page); |
| 791 | buf->page = page; |
| 792 | buf->offset = offset; |
| 793 | buf->len = count; |
| 794 | |
| 795 | cs->pipebufs++; |
| 796 | cs->nr_segs++; |
| 797 | cs->len = 0; |
| 798 | |
| 799 | return 0; |
| 800 | } |
| 801 | |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 802 | /* |
| 803 | * Copy a page in the request to/from the userspace buffer. Must be |
| 804 | * done atomically |
| 805 | */ |
Miklos Szeredi | ce534fb | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 806 | 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] | 807 | unsigned offset, unsigned count, int zeroing) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 808 | { |
Miklos Szeredi | ce534fb | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 809 | int err; |
| 810 | struct page *page = *pagep; |
| 811 | |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 812 | if (page && zeroing && count < PAGE_SIZE) { |
| 813 | void *mapaddr = kmap_atomic(page, KM_USER1); |
Jan Beulich | 3ecb01d | 2010-10-26 14:22:27 -0700 | [diff] [blame^] | 814 | clear_page(mapaddr); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 815 | kunmap_atomic(mapaddr, KM_USER1); |
| 816 | } |
| 817 | while (count) { |
Miklos Szeredi | c302162 | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 818 | if (cs->write && cs->pipebufs && page) { |
| 819 | return fuse_ref_page(cs, page, offset, count); |
| 820 | } else if (!cs->len) { |
Miklos Szeredi | ce534fb | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 821 | if (cs->move_pages && page && |
| 822 | offset == 0 && count == PAGE_SIZE) { |
| 823 | err = fuse_try_move_page(cs, pagep); |
| 824 | if (err <= 0) |
| 825 | return err; |
| 826 | } else { |
| 827 | err = fuse_copy_fill(cs); |
| 828 | if (err) |
| 829 | return err; |
| 830 | } |
Miklos Szeredi | 1729a16 | 2008-11-26 12:03:54 +0100 | [diff] [blame] | 831 | } |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 832 | if (page) { |
| 833 | void *mapaddr = kmap_atomic(page, KM_USER1); |
| 834 | void *buf = mapaddr + offset; |
| 835 | offset += fuse_copy_do(cs, &buf, &count); |
| 836 | kunmap_atomic(mapaddr, KM_USER1); |
| 837 | } else |
| 838 | offset += fuse_copy_do(cs, NULL, &count); |
| 839 | } |
| 840 | if (page && !cs->write) |
| 841 | flush_dcache_page(page); |
| 842 | return 0; |
| 843 | } |
| 844 | |
| 845 | /* Copy pages in the request to/from userspace buffer */ |
| 846 | static int fuse_copy_pages(struct fuse_copy_state *cs, unsigned nbytes, |
| 847 | int zeroing) |
| 848 | { |
| 849 | unsigned i; |
| 850 | struct fuse_req *req = cs->req; |
| 851 | unsigned offset = req->page_offset; |
| 852 | unsigned count = min(nbytes, (unsigned) PAGE_SIZE - offset); |
| 853 | |
| 854 | for (i = 0; i < req->num_pages && (nbytes || zeroing); i++) { |
Miklos Szeredi | ce534fb | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 855 | int err; |
| 856 | |
| 857 | err = fuse_copy_page(cs, &req->pages[i], offset, count, |
| 858 | zeroing); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 859 | if (err) |
| 860 | return err; |
| 861 | |
| 862 | nbytes -= count; |
| 863 | count = min(nbytes, (unsigned) PAGE_SIZE); |
| 864 | offset = 0; |
| 865 | } |
| 866 | return 0; |
| 867 | } |
| 868 | |
| 869 | /* Copy a single argument in the request to/from userspace buffer */ |
| 870 | static int fuse_copy_one(struct fuse_copy_state *cs, void *val, unsigned size) |
| 871 | { |
| 872 | while (size) { |
Miklos Szeredi | 1729a16 | 2008-11-26 12:03:54 +0100 | [diff] [blame] | 873 | if (!cs->len) { |
| 874 | int err = fuse_copy_fill(cs); |
| 875 | if (err) |
| 876 | return err; |
| 877 | } |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 878 | fuse_copy_do(cs, &val, &size); |
| 879 | } |
| 880 | return 0; |
| 881 | } |
| 882 | |
| 883 | /* Copy request arguments to/from userspace buffer */ |
| 884 | static int fuse_copy_args(struct fuse_copy_state *cs, unsigned numargs, |
| 885 | unsigned argpages, struct fuse_arg *args, |
| 886 | int zeroing) |
| 887 | { |
| 888 | int err = 0; |
| 889 | unsigned i; |
| 890 | |
| 891 | for (i = 0; !err && i < numargs; i++) { |
| 892 | struct fuse_arg *arg = &args[i]; |
| 893 | if (i == numargs - 1 && argpages) |
| 894 | err = fuse_copy_pages(cs, arg->size, zeroing); |
| 895 | else |
| 896 | err = fuse_copy_one(cs, arg->value, arg->size); |
| 897 | } |
| 898 | return err; |
| 899 | } |
| 900 | |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 901 | static int request_pending(struct fuse_conn *fc) |
| 902 | { |
| 903 | return !list_empty(&fc->pending) || !list_empty(&fc->interrupts); |
| 904 | } |
| 905 | |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 906 | /* Wait until a request is available on the pending list */ |
| 907 | static void request_wait(struct fuse_conn *fc) |
Miklos Szeredi | b9ca67b | 2010-09-07 13:42:41 +0200 | [diff] [blame] | 908 | __releases(fc->lock) |
| 909 | __acquires(fc->lock) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 910 | { |
| 911 | DECLARE_WAITQUEUE(wait, current); |
| 912 | |
| 913 | add_wait_queue_exclusive(&fc->waitq, &wait); |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 914 | while (fc->connected && !request_pending(fc)) { |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 915 | set_current_state(TASK_INTERRUPTIBLE); |
| 916 | if (signal_pending(current)) |
| 917 | break; |
| 918 | |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 919 | spin_unlock(&fc->lock); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 920 | schedule(); |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 921 | spin_lock(&fc->lock); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 922 | } |
| 923 | set_current_state(TASK_RUNNING); |
| 924 | remove_wait_queue(&fc->waitq, &wait); |
| 925 | } |
| 926 | |
| 927 | /* |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 928 | * Transfer an interrupt request to userspace |
| 929 | * |
| 930 | * Unlike other requests this is assembled on demand, without a need |
| 931 | * to allocate a separate fuse_req structure. |
| 932 | * |
| 933 | * Called with fc->lock held, releases it |
| 934 | */ |
Miklos Szeredi | c302162 | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 935 | static int fuse_read_interrupt(struct fuse_conn *fc, struct fuse_copy_state *cs, |
| 936 | size_t nbytes, struct fuse_req *req) |
Miklos Szeredi | b9ca67b | 2010-09-07 13:42:41 +0200 | [diff] [blame] | 937 | __releases(fc->lock) |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 938 | { |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 939 | struct fuse_in_header ih; |
| 940 | struct fuse_interrupt_in arg; |
| 941 | unsigned reqsize = sizeof(ih) + sizeof(arg); |
| 942 | int err; |
| 943 | |
| 944 | list_del_init(&req->intr_entry); |
| 945 | req->intr_unique = fuse_get_unique(fc); |
| 946 | memset(&ih, 0, sizeof(ih)); |
| 947 | memset(&arg, 0, sizeof(arg)); |
| 948 | ih.len = reqsize; |
| 949 | ih.opcode = FUSE_INTERRUPT; |
| 950 | ih.unique = req->intr_unique; |
| 951 | arg.unique = req->in.h.unique; |
| 952 | |
| 953 | spin_unlock(&fc->lock); |
Miklos Szeredi | c302162 | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 954 | if (nbytes < reqsize) |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 955 | return -EINVAL; |
| 956 | |
Miklos Szeredi | c302162 | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 957 | err = fuse_copy_one(cs, &ih, sizeof(ih)); |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 958 | if (!err) |
Miklos Szeredi | c302162 | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 959 | err = fuse_copy_one(cs, &arg, sizeof(arg)); |
| 960 | fuse_copy_finish(cs); |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 961 | |
| 962 | return err ? err : reqsize; |
| 963 | } |
| 964 | |
| 965 | /* |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 966 | * Read a single request into the userspace filesystem's buffer. This |
| 967 | * function waits until a request is available, then removes it from |
| 968 | * the pending list and copies request data to userspace buffer. If |
Miklos Szeredi | f9a2842 | 2006-06-25 05:48:53 -0700 | [diff] [blame] | 969 | * no reply is needed (FORGET) or request has been aborted or there |
| 970 | * was an error during the copying then it's finished by calling |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 971 | * request_end(). Otherwise add it to the processing list, and set |
| 972 | * the 'sent' flag. |
| 973 | */ |
Miklos Szeredi | c302162 | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 974 | static ssize_t fuse_dev_do_read(struct fuse_conn *fc, struct file *file, |
| 975 | struct fuse_copy_state *cs, size_t nbytes) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 976 | { |
| 977 | int err; |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 978 | struct fuse_req *req; |
| 979 | struct fuse_in *in; |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 980 | unsigned reqsize; |
| 981 | |
Miklos Szeredi | 1d3d752 | 2006-01-06 00:19:40 -0800 | [diff] [blame] | 982 | restart: |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 983 | spin_lock(&fc->lock); |
Jeff Dike | e5ac1d1 | 2006-04-10 22:54:53 -0700 | [diff] [blame] | 984 | err = -EAGAIN; |
| 985 | if ((file->f_flags & O_NONBLOCK) && fc->connected && |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 986 | !request_pending(fc)) |
Jeff Dike | e5ac1d1 | 2006-04-10 22:54:53 -0700 | [diff] [blame] | 987 | goto err_unlock; |
| 988 | |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 989 | request_wait(fc); |
| 990 | err = -ENODEV; |
Miklos Szeredi | 9ba7cbb | 2006-01-16 22:14:34 -0800 | [diff] [blame] | 991 | if (!fc->connected) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 992 | goto err_unlock; |
| 993 | err = -ERESTARTSYS; |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 994 | if (!request_pending(fc)) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 995 | goto err_unlock; |
| 996 | |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 997 | if (!list_empty(&fc->interrupts)) { |
| 998 | req = list_entry(fc->interrupts.next, struct fuse_req, |
| 999 | intr_entry); |
Miklos Szeredi | c302162 | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 1000 | return fuse_read_interrupt(fc, cs, nbytes, req); |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 1001 | } |
| 1002 | |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1003 | req = list_entry(fc->pending.next, struct fuse_req, list); |
Miklos Szeredi | 83cfd49 | 2006-01-16 22:14:31 -0800 | [diff] [blame] | 1004 | req->state = FUSE_REQ_READING; |
Miklos Szeredi | d77a1d5 | 2006-01-16 22:14:31 -0800 | [diff] [blame] | 1005 | list_move(&req->list, &fc->io); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1006 | |
| 1007 | in = &req->in; |
Miklos Szeredi | 1d3d752 | 2006-01-06 00:19:40 -0800 | [diff] [blame] | 1008 | reqsize = in->h.len; |
| 1009 | /* 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] | 1010 | if (nbytes < reqsize) { |
Miklos Szeredi | 1d3d752 | 2006-01-06 00:19:40 -0800 | [diff] [blame] | 1011 | req->out.h.error = -EIO; |
| 1012 | /* SETXATTR is special, since it may contain too large data */ |
| 1013 | if (in->h.opcode == FUSE_SETXATTR) |
| 1014 | req->out.h.error = -E2BIG; |
| 1015 | request_end(fc, req); |
| 1016 | goto restart; |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1017 | } |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 1018 | spin_unlock(&fc->lock); |
Miklos Szeredi | c302162 | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 1019 | cs->req = req; |
| 1020 | err = fuse_copy_one(cs, &in->h, sizeof(in->h)); |
Miklos Szeredi | 1d3d752 | 2006-01-06 00:19:40 -0800 | [diff] [blame] | 1021 | if (!err) |
Miklos Szeredi | c302162 | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 1022 | err = fuse_copy_args(cs, in->numargs, in->argpages, |
Miklos Szeredi | 1d3d752 | 2006-01-06 00:19:40 -0800 | [diff] [blame] | 1023 | (struct fuse_arg *) in->args, 0); |
Miklos Szeredi | c302162 | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 1024 | fuse_copy_finish(cs); |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 1025 | spin_lock(&fc->lock); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1026 | req->locked = 0; |
Miklos Szeredi | c9c9d7d | 2007-10-16 23:31:05 -0700 | [diff] [blame] | 1027 | if (req->aborted) { |
| 1028 | request_end(fc, req); |
| 1029 | return -ENODEV; |
| 1030 | } |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1031 | if (err) { |
Miklos Szeredi | c9c9d7d | 2007-10-16 23:31:05 -0700 | [diff] [blame] | 1032 | req->out.h.error = -EIO; |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1033 | request_end(fc, req); |
| 1034 | return err; |
| 1035 | } |
| 1036 | if (!req->isreply) |
| 1037 | request_end(fc, req); |
| 1038 | else { |
Miklos Szeredi | 83cfd49 | 2006-01-16 22:14:31 -0800 | [diff] [blame] | 1039 | req->state = FUSE_REQ_SENT; |
Miklos Szeredi | d77a1d5 | 2006-01-16 22:14:31 -0800 | [diff] [blame] | 1040 | list_move_tail(&req->list, &fc->processing); |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 1041 | if (req->interrupted) |
| 1042 | queue_interrupt(fc, req); |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 1043 | spin_unlock(&fc->lock); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1044 | } |
| 1045 | return reqsize; |
| 1046 | |
| 1047 | err_unlock: |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 1048 | spin_unlock(&fc->lock); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1049 | return err; |
| 1050 | } |
| 1051 | |
Miklos Szeredi | c302162 | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 1052 | static ssize_t fuse_dev_read(struct kiocb *iocb, const struct iovec *iov, |
| 1053 | unsigned long nr_segs, loff_t pos) |
| 1054 | { |
| 1055 | struct fuse_copy_state cs; |
| 1056 | struct file *file = iocb->ki_filp; |
| 1057 | struct fuse_conn *fc = fuse_get_conn(file); |
| 1058 | if (!fc) |
| 1059 | return -EPERM; |
| 1060 | |
| 1061 | fuse_copy_init(&cs, fc, 1, iov, nr_segs); |
| 1062 | |
| 1063 | return fuse_dev_do_read(fc, file, &cs, iov_length(iov, nr_segs)); |
| 1064 | } |
| 1065 | |
| 1066 | static int fuse_dev_pipe_buf_steal(struct pipe_inode_info *pipe, |
| 1067 | struct pipe_buffer *buf) |
| 1068 | { |
| 1069 | return 1; |
| 1070 | } |
| 1071 | |
| 1072 | static const struct pipe_buf_operations fuse_dev_pipe_buf_ops = { |
| 1073 | .can_merge = 0, |
| 1074 | .map = generic_pipe_buf_map, |
| 1075 | .unmap = generic_pipe_buf_unmap, |
| 1076 | .confirm = generic_pipe_buf_confirm, |
| 1077 | .release = generic_pipe_buf_release, |
| 1078 | .steal = fuse_dev_pipe_buf_steal, |
| 1079 | .get = generic_pipe_buf_get, |
| 1080 | }; |
| 1081 | |
| 1082 | static ssize_t fuse_dev_splice_read(struct file *in, loff_t *ppos, |
| 1083 | struct pipe_inode_info *pipe, |
| 1084 | size_t len, unsigned int flags) |
| 1085 | { |
| 1086 | int ret; |
| 1087 | int page_nr = 0; |
| 1088 | int do_wakeup = 0; |
| 1089 | struct pipe_buffer *bufs; |
| 1090 | struct fuse_copy_state cs; |
| 1091 | struct fuse_conn *fc = fuse_get_conn(in); |
| 1092 | if (!fc) |
| 1093 | return -EPERM; |
| 1094 | |
| 1095 | bufs = kmalloc(pipe->buffers * sizeof (struct pipe_buffer), GFP_KERNEL); |
| 1096 | if (!bufs) |
| 1097 | return -ENOMEM; |
| 1098 | |
| 1099 | fuse_copy_init(&cs, fc, 1, NULL, 0); |
| 1100 | cs.pipebufs = bufs; |
| 1101 | cs.pipe = pipe; |
| 1102 | ret = fuse_dev_do_read(fc, in, &cs, len); |
| 1103 | if (ret < 0) |
| 1104 | goto out; |
| 1105 | |
| 1106 | ret = 0; |
| 1107 | pipe_lock(pipe); |
| 1108 | |
| 1109 | if (!pipe->readers) { |
| 1110 | send_sig(SIGPIPE, current, 0); |
| 1111 | if (!ret) |
| 1112 | ret = -EPIPE; |
| 1113 | goto out_unlock; |
| 1114 | } |
| 1115 | |
| 1116 | if (pipe->nrbufs + cs.nr_segs > pipe->buffers) { |
| 1117 | ret = -EIO; |
| 1118 | goto out_unlock; |
| 1119 | } |
| 1120 | |
| 1121 | while (page_nr < cs.nr_segs) { |
| 1122 | int newbuf = (pipe->curbuf + pipe->nrbufs) & (pipe->buffers - 1); |
| 1123 | struct pipe_buffer *buf = pipe->bufs + newbuf; |
| 1124 | |
| 1125 | buf->page = bufs[page_nr].page; |
| 1126 | buf->offset = bufs[page_nr].offset; |
| 1127 | buf->len = bufs[page_nr].len; |
| 1128 | buf->ops = &fuse_dev_pipe_buf_ops; |
| 1129 | |
| 1130 | pipe->nrbufs++; |
| 1131 | page_nr++; |
| 1132 | ret += buf->len; |
| 1133 | |
| 1134 | if (pipe->inode) |
| 1135 | do_wakeup = 1; |
| 1136 | } |
| 1137 | |
| 1138 | out_unlock: |
| 1139 | pipe_unlock(pipe); |
| 1140 | |
| 1141 | if (do_wakeup) { |
| 1142 | smp_mb(); |
| 1143 | if (waitqueue_active(&pipe->wait)) |
| 1144 | wake_up_interruptible(&pipe->wait); |
| 1145 | kill_fasync(&pipe->fasync_readers, SIGIO, POLL_IN); |
| 1146 | } |
| 1147 | |
| 1148 | out: |
| 1149 | for (; page_nr < cs.nr_segs; page_nr++) |
| 1150 | page_cache_release(bufs[page_nr].page); |
| 1151 | |
| 1152 | kfree(bufs); |
| 1153 | return ret; |
| 1154 | } |
| 1155 | |
Tejun Heo | 95668a6 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 1156 | static int fuse_notify_poll(struct fuse_conn *fc, unsigned int size, |
| 1157 | struct fuse_copy_state *cs) |
| 1158 | { |
| 1159 | struct fuse_notify_poll_wakeup_out outarg; |
Miklos Szeredi | f6d47a1 | 2009-01-26 15:00:59 +0100 | [diff] [blame] | 1160 | int err = -EINVAL; |
Tejun Heo | 95668a6 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 1161 | |
| 1162 | if (size != sizeof(outarg)) |
Miklos Szeredi | f6d47a1 | 2009-01-26 15:00:59 +0100 | [diff] [blame] | 1163 | goto err; |
Tejun Heo | 95668a6 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 1164 | |
| 1165 | err = fuse_copy_one(cs, &outarg, sizeof(outarg)); |
| 1166 | if (err) |
Miklos Szeredi | f6d47a1 | 2009-01-26 15:00:59 +0100 | [diff] [blame] | 1167 | goto err; |
Tejun Heo | 95668a6 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 1168 | |
Miklos Szeredi | f6d47a1 | 2009-01-26 15:00:59 +0100 | [diff] [blame] | 1169 | fuse_copy_finish(cs); |
Tejun Heo | 95668a6 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 1170 | return fuse_notify_poll_wakeup(fc, &outarg); |
Miklos Szeredi | f6d47a1 | 2009-01-26 15:00:59 +0100 | [diff] [blame] | 1171 | |
| 1172 | err: |
| 1173 | fuse_copy_finish(cs); |
| 1174 | return err; |
Tejun Heo | 95668a6 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 1175 | } |
| 1176 | |
John Muir | 3b463ae | 2009-05-31 11:13:57 -0400 | [diff] [blame] | 1177 | static int fuse_notify_inval_inode(struct fuse_conn *fc, unsigned int size, |
| 1178 | struct fuse_copy_state *cs) |
| 1179 | { |
| 1180 | struct fuse_notify_inval_inode_out outarg; |
| 1181 | int err = -EINVAL; |
| 1182 | |
| 1183 | if (size != sizeof(outarg)) |
| 1184 | goto err; |
| 1185 | |
| 1186 | err = fuse_copy_one(cs, &outarg, sizeof(outarg)); |
| 1187 | if (err) |
| 1188 | goto err; |
| 1189 | fuse_copy_finish(cs); |
| 1190 | |
| 1191 | down_read(&fc->killsb); |
| 1192 | err = -ENOENT; |
Miklos Szeredi | b21dda4 | 2010-02-05 12:08:31 +0100 | [diff] [blame] | 1193 | if (fc->sb) { |
| 1194 | err = fuse_reverse_inval_inode(fc->sb, outarg.ino, |
| 1195 | outarg.off, outarg.len); |
| 1196 | } |
John Muir | 3b463ae | 2009-05-31 11:13:57 -0400 | [diff] [blame] | 1197 | up_read(&fc->killsb); |
| 1198 | return err; |
| 1199 | |
| 1200 | err: |
| 1201 | fuse_copy_finish(cs); |
| 1202 | return err; |
| 1203 | } |
| 1204 | |
| 1205 | static int fuse_notify_inval_entry(struct fuse_conn *fc, unsigned int size, |
| 1206 | struct fuse_copy_state *cs) |
| 1207 | { |
| 1208 | struct fuse_notify_inval_entry_out outarg; |
Fang Wenqi | b2d82ee | 2009-12-30 18:37:13 +0800 | [diff] [blame] | 1209 | int err = -ENOMEM; |
| 1210 | char *buf; |
John Muir | 3b463ae | 2009-05-31 11:13:57 -0400 | [diff] [blame] | 1211 | struct qstr name; |
| 1212 | |
Fang Wenqi | b2d82ee | 2009-12-30 18:37:13 +0800 | [diff] [blame] | 1213 | buf = kzalloc(FUSE_NAME_MAX + 1, GFP_KERNEL); |
| 1214 | if (!buf) |
| 1215 | goto err; |
| 1216 | |
| 1217 | err = -EINVAL; |
John Muir | 3b463ae | 2009-05-31 11:13:57 -0400 | [diff] [blame] | 1218 | if (size < sizeof(outarg)) |
| 1219 | goto err; |
| 1220 | |
| 1221 | err = fuse_copy_one(cs, &outarg, sizeof(outarg)); |
| 1222 | if (err) |
| 1223 | goto err; |
| 1224 | |
| 1225 | err = -ENAMETOOLONG; |
| 1226 | if (outarg.namelen > FUSE_NAME_MAX) |
| 1227 | goto err; |
| 1228 | |
| 1229 | name.name = buf; |
| 1230 | name.len = outarg.namelen; |
| 1231 | err = fuse_copy_one(cs, buf, outarg.namelen + 1); |
| 1232 | if (err) |
| 1233 | goto err; |
| 1234 | fuse_copy_finish(cs); |
| 1235 | buf[outarg.namelen] = 0; |
| 1236 | name.hash = full_name_hash(name.name, name.len); |
| 1237 | |
| 1238 | down_read(&fc->killsb); |
| 1239 | err = -ENOENT; |
Miklos Szeredi | b21dda4 | 2010-02-05 12:08:31 +0100 | [diff] [blame] | 1240 | if (fc->sb) |
| 1241 | err = fuse_reverse_inval_entry(fc->sb, outarg.parent, &name); |
John Muir | 3b463ae | 2009-05-31 11:13:57 -0400 | [diff] [blame] | 1242 | up_read(&fc->killsb); |
Fang Wenqi | b2d82ee | 2009-12-30 18:37:13 +0800 | [diff] [blame] | 1243 | kfree(buf); |
John Muir | 3b463ae | 2009-05-31 11:13:57 -0400 | [diff] [blame] | 1244 | return err; |
| 1245 | |
| 1246 | err: |
Fang Wenqi | b2d82ee | 2009-12-30 18:37:13 +0800 | [diff] [blame] | 1247 | kfree(buf); |
John Muir | 3b463ae | 2009-05-31 11:13:57 -0400 | [diff] [blame] | 1248 | fuse_copy_finish(cs); |
| 1249 | return err; |
| 1250 | } |
| 1251 | |
Miklos Szeredi | a1d75f2 | 2010-07-12 14:41:40 +0200 | [diff] [blame] | 1252 | static int fuse_notify_store(struct fuse_conn *fc, unsigned int size, |
| 1253 | struct fuse_copy_state *cs) |
| 1254 | { |
| 1255 | struct fuse_notify_store_out outarg; |
| 1256 | struct inode *inode; |
| 1257 | struct address_space *mapping; |
| 1258 | u64 nodeid; |
| 1259 | int err; |
| 1260 | pgoff_t index; |
| 1261 | unsigned int offset; |
| 1262 | unsigned int num; |
| 1263 | loff_t file_size; |
| 1264 | loff_t end; |
| 1265 | |
| 1266 | err = -EINVAL; |
| 1267 | if (size < sizeof(outarg)) |
| 1268 | goto out_finish; |
| 1269 | |
| 1270 | err = fuse_copy_one(cs, &outarg, sizeof(outarg)); |
| 1271 | if (err) |
| 1272 | goto out_finish; |
| 1273 | |
| 1274 | err = -EINVAL; |
| 1275 | if (size - sizeof(outarg) != outarg.size) |
| 1276 | goto out_finish; |
| 1277 | |
| 1278 | nodeid = outarg.nodeid; |
| 1279 | |
| 1280 | down_read(&fc->killsb); |
| 1281 | |
| 1282 | err = -ENOENT; |
| 1283 | if (!fc->sb) |
| 1284 | goto out_up_killsb; |
| 1285 | |
| 1286 | inode = ilookup5(fc->sb, nodeid, fuse_inode_eq, &nodeid); |
| 1287 | if (!inode) |
| 1288 | goto out_up_killsb; |
| 1289 | |
| 1290 | mapping = inode->i_mapping; |
| 1291 | index = outarg.offset >> PAGE_CACHE_SHIFT; |
| 1292 | offset = outarg.offset & ~PAGE_CACHE_MASK; |
| 1293 | file_size = i_size_read(inode); |
| 1294 | end = outarg.offset + outarg.size; |
| 1295 | if (end > file_size) { |
| 1296 | file_size = end; |
| 1297 | fuse_write_update_size(inode, file_size); |
| 1298 | } |
| 1299 | |
| 1300 | num = outarg.size; |
| 1301 | while (num) { |
| 1302 | struct page *page; |
| 1303 | unsigned int this_num; |
| 1304 | |
| 1305 | err = -ENOMEM; |
| 1306 | page = find_or_create_page(mapping, index, |
| 1307 | mapping_gfp_mask(mapping)); |
| 1308 | if (!page) |
| 1309 | goto out_iput; |
| 1310 | |
| 1311 | this_num = min_t(unsigned, num, PAGE_CACHE_SIZE - offset); |
| 1312 | err = fuse_copy_page(cs, &page, offset, this_num, 0); |
| 1313 | if (!err && offset == 0 && (num != 0 || file_size == end)) |
| 1314 | SetPageUptodate(page); |
| 1315 | unlock_page(page); |
| 1316 | page_cache_release(page); |
| 1317 | |
| 1318 | if (err) |
| 1319 | goto out_iput; |
| 1320 | |
| 1321 | num -= this_num; |
| 1322 | offset = 0; |
| 1323 | index++; |
| 1324 | } |
| 1325 | |
| 1326 | err = 0; |
| 1327 | |
| 1328 | out_iput: |
| 1329 | iput(inode); |
| 1330 | out_up_killsb: |
| 1331 | up_read(&fc->killsb); |
| 1332 | out_finish: |
| 1333 | fuse_copy_finish(cs); |
| 1334 | return err; |
| 1335 | } |
| 1336 | |
Miklos Szeredi | 2d45ba3 | 2010-07-12 14:41:40 +0200 | [diff] [blame] | 1337 | static void fuse_retrieve_end(struct fuse_conn *fc, struct fuse_req *req) |
| 1338 | { |
| 1339 | int i; |
| 1340 | |
| 1341 | for (i = 0; i < req->num_pages; i++) { |
| 1342 | struct page *page = req->pages[i]; |
| 1343 | page_cache_release(page); |
| 1344 | } |
| 1345 | } |
| 1346 | |
| 1347 | static int fuse_retrieve(struct fuse_conn *fc, struct inode *inode, |
| 1348 | struct fuse_notify_retrieve_out *outarg) |
| 1349 | { |
| 1350 | int err; |
| 1351 | struct address_space *mapping = inode->i_mapping; |
| 1352 | struct fuse_req *req; |
| 1353 | pgoff_t index; |
| 1354 | loff_t file_size; |
| 1355 | unsigned int num; |
| 1356 | unsigned int offset; |
Geert Uytterhoeven | 0157443 | 2010-09-30 22:06:21 +0200 | [diff] [blame] | 1357 | size_t total_len = 0; |
Miklos Szeredi | 2d45ba3 | 2010-07-12 14:41:40 +0200 | [diff] [blame] | 1358 | |
| 1359 | req = fuse_get_req(fc); |
| 1360 | if (IS_ERR(req)) |
| 1361 | return PTR_ERR(req); |
| 1362 | |
| 1363 | offset = outarg->offset & ~PAGE_CACHE_MASK; |
| 1364 | |
| 1365 | req->in.h.opcode = FUSE_NOTIFY_REPLY; |
| 1366 | req->in.h.nodeid = outarg->nodeid; |
| 1367 | req->in.numargs = 2; |
| 1368 | req->in.argpages = 1; |
| 1369 | req->page_offset = offset; |
| 1370 | req->end = fuse_retrieve_end; |
| 1371 | |
| 1372 | index = outarg->offset >> PAGE_CACHE_SHIFT; |
| 1373 | file_size = i_size_read(inode); |
| 1374 | num = outarg->size; |
| 1375 | if (outarg->offset > file_size) |
| 1376 | num = 0; |
| 1377 | else if (outarg->offset + num > file_size) |
| 1378 | num = file_size - outarg->offset; |
| 1379 | |
| 1380 | while (num) { |
| 1381 | struct page *page; |
| 1382 | unsigned int this_num; |
| 1383 | |
| 1384 | page = find_get_page(mapping, index); |
| 1385 | if (!page) |
| 1386 | break; |
| 1387 | |
| 1388 | this_num = min_t(unsigned, num, PAGE_CACHE_SIZE - offset); |
| 1389 | req->pages[req->num_pages] = page; |
| 1390 | req->num_pages++; |
| 1391 | |
| 1392 | num -= this_num; |
| 1393 | total_len += this_num; |
| 1394 | } |
| 1395 | req->misc.retrieve_in.offset = outarg->offset; |
| 1396 | req->misc.retrieve_in.size = total_len; |
| 1397 | req->in.args[0].size = sizeof(req->misc.retrieve_in); |
| 1398 | req->in.args[0].value = &req->misc.retrieve_in; |
| 1399 | req->in.args[1].size = total_len; |
| 1400 | |
| 1401 | err = fuse_request_send_notify_reply(fc, req, outarg->notify_unique); |
| 1402 | if (err) |
| 1403 | fuse_retrieve_end(fc, req); |
| 1404 | |
| 1405 | return err; |
| 1406 | } |
| 1407 | |
| 1408 | static int fuse_notify_retrieve(struct fuse_conn *fc, unsigned int size, |
| 1409 | struct fuse_copy_state *cs) |
| 1410 | { |
| 1411 | struct fuse_notify_retrieve_out outarg; |
| 1412 | struct inode *inode; |
| 1413 | int err; |
| 1414 | |
| 1415 | err = -EINVAL; |
| 1416 | if (size != sizeof(outarg)) |
| 1417 | goto copy_finish; |
| 1418 | |
| 1419 | err = fuse_copy_one(cs, &outarg, sizeof(outarg)); |
| 1420 | if (err) |
| 1421 | goto copy_finish; |
| 1422 | |
| 1423 | fuse_copy_finish(cs); |
| 1424 | |
| 1425 | down_read(&fc->killsb); |
| 1426 | err = -ENOENT; |
| 1427 | if (fc->sb) { |
| 1428 | u64 nodeid = outarg.nodeid; |
| 1429 | |
| 1430 | inode = ilookup5(fc->sb, nodeid, fuse_inode_eq, &nodeid); |
| 1431 | if (inode) { |
| 1432 | err = fuse_retrieve(fc, inode, &outarg); |
| 1433 | iput(inode); |
| 1434 | } |
| 1435 | } |
| 1436 | up_read(&fc->killsb); |
| 1437 | |
| 1438 | return err; |
| 1439 | |
| 1440 | copy_finish: |
| 1441 | fuse_copy_finish(cs); |
| 1442 | return err; |
| 1443 | } |
| 1444 | |
Tejun Heo | 8599396 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 1445 | static int fuse_notify(struct fuse_conn *fc, enum fuse_notify_code code, |
| 1446 | unsigned int size, struct fuse_copy_state *cs) |
| 1447 | { |
| 1448 | switch (code) { |
Tejun Heo | 95668a6 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 1449 | case FUSE_NOTIFY_POLL: |
| 1450 | return fuse_notify_poll(fc, size, cs); |
| 1451 | |
John Muir | 3b463ae | 2009-05-31 11:13:57 -0400 | [diff] [blame] | 1452 | case FUSE_NOTIFY_INVAL_INODE: |
| 1453 | return fuse_notify_inval_inode(fc, size, cs); |
| 1454 | |
| 1455 | case FUSE_NOTIFY_INVAL_ENTRY: |
| 1456 | return fuse_notify_inval_entry(fc, size, cs); |
| 1457 | |
Miklos Szeredi | a1d75f2 | 2010-07-12 14:41:40 +0200 | [diff] [blame] | 1458 | case FUSE_NOTIFY_STORE: |
| 1459 | return fuse_notify_store(fc, size, cs); |
| 1460 | |
Miklos Szeredi | 2d45ba3 | 2010-07-12 14:41:40 +0200 | [diff] [blame] | 1461 | case FUSE_NOTIFY_RETRIEVE: |
| 1462 | return fuse_notify_retrieve(fc, size, cs); |
| 1463 | |
Tejun Heo | 8599396 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 1464 | default: |
Miklos Szeredi | f6d47a1 | 2009-01-26 15:00:59 +0100 | [diff] [blame] | 1465 | fuse_copy_finish(cs); |
Tejun Heo | 8599396 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 1466 | return -EINVAL; |
| 1467 | } |
| 1468 | } |
| 1469 | |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1470 | /* Look up request on processing list by unique ID */ |
| 1471 | static struct fuse_req *request_find(struct fuse_conn *fc, u64 unique) |
| 1472 | { |
| 1473 | struct list_head *entry; |
| 1474 | |
| 1475 | list_for_each(entry, &fc->processing) { |
| 1476 | struct fuse_req *req; |
| 1477 | req = list_entry(entry, struct fuse_req, list); |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 1478 | if (req->in.h.unique == unique || req->intr_unique == unique) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1479 | return req; |
| 1480 | } |
| 1481 | return NULL; |
| 1482 | } |
| 1483 | |
| 1484 | static int copy_out_args(struct fuse_copy_state *cs, struct fuse_out *out, |
| 1485 | unsigned nbytes) |
| 1486 | { |
| 1487 | unsigned reqsize = sizeof(struct fuse_out_header); |
| 1488 | |
| 1489 | if (out->h.error) |
| 1490 | return nbytes != reqsize ? -EINVAL : 0; |
| 1491 | |
| 1492 | reqsize += len_args(out->numargs, out->args); |
| 1493 | |
| 1494 | if (reqsize < nbytes || (reqsize > nbytes && !out->argvar)) |
| 1495 | return -EINVAL; |
| 1496 | else if (reqsize > nbytes) { |
| 1497 | struct fuse_arg *lastarg = &out->args[out->numargs-1]; |
| 1498 | unsigned diffsize = reqsize - nbytes; |
| 1499 | if (diffsize > lastarg->size) |
| 1500 | return -EINVAL; |
| 1501 | lastarg->size -= diffsize; |
| 1502 | } |
| 1503 | return fuse_copy_args(cs, out->numargs, out->argpages, out->args, |
| 1504 | out->page_zeroing); |
| 1505 | } |
| 1506 | |
| 1507 | /* |
| 1508 | * Write a single reply to a request. First the header is copied from |
| 1509 | * the write buffer. The request is then searched on the processing |
| 1510 | * list by the unique ID found in the header. If found, then remove |
| 1511 | * it from the list and copy the rest of the buffer to the request. |
| 1512 | * The request is finished by calling request_end() |
| 1513 | */ |
Miklos Szeredi | dd3bb14 | 2010-05-25 15:06:06 +0200 | [diff] [blame] | 1514 | static ssize_t fuse_dev_do_write(struct fuse_conn *fc, |
| 1515 | struct fuse_copy_state *cs, size_t nbytes) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1516 | { |
| 1517 | int err; |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1518 | struct fuse_req *req; |
| 1519 | struct fuse_out_header oh; |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1520 | |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1521 | if (nbytes < sizeof(struct fuse_out_header)) |
| 1522 | return -EINVAL; |
| 1523 | |
Miklos Szeredi | dd3bb14 | 2010-05-25 15:06:06 +0200 | [diff] [blame] | 1524 | err = fuse_copy_one(cs, &oh, sizeof(oh)); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1525 | if (err) |
| 1526 | goto err_finish; |
Tejun Heo | 8599396 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 1527 | |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1528 | err = -EINVAL; |
Tejun Heo | 8599396 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 1529 | if (oh.len != nbytes) |
| 1530 | goto err_finish; |
| 1531 | |
| 1532 | /* |
| 1533 | * Zero oh.unique indicates unsolicited notification message |
| 1534 | * and error contains notification code. |
| 1535 | */ |
| 1536 | if (!oh.unique) { |
Miklos Szeredi | dd3bb14 | 2010-05-25 15:06:06 +0200 | [diff] [blame] | 1537 | err = fuse_notify(fc, oh.error, nbytes - sizeof(oh), cs); |
Tejun Heo | 8599396 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 1538 | return err ? err : nbytes; |
| 1539 | } |
| 1540 | |
| 1541 | err = -EINVAL; |
| 1542 | if (oh.error <= -1000 || oh.error > 0) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1543 | goto err_finish; |
| 1544 | |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 1545 | spin_lock(&fc->lock); |
Miklos Szeredi | 69a53bf | 2006-01-16 22:14:41 -0800 | [diff] [blame] | 1546 | err = -ENOENT; |
| 1547 | if (!fc->connected) |
| 1548 | goto err_unlock; |
| 1549 | |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1550 | req = request_find(fc, oh.unique); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1551 | if (!req) |
| 1552 | goto err_unlock; |
| 1553 | |
Miklos Szeredi | f9a2842 | 2006-06-25 05:48:53 -0700 | [diff] [blame] | 1554 | if (req->aborted) { |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 1555 | spin_unlock(&fc->lock); |
Miklos Szeredi | dd3bb14 | 2010-05-25 15:06:06 +0200 | [diff] [blame] | 1556 | fuse_copy_finish(cs); |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 1557 | spin_lock(&fc->lock); |
Miklos Szeredi | 222f1d6 | 2006-01-16 22:14:25 -0800 | [diff] [blame] | 1558 | request_end(fc, req); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1559 | return -ENOENT; |
| 1560 | } |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 1561 | /* Is it an interrupt reply? */ |
| 1562 | if (req->intr_unique == oh.unique) { |
| 1563 | err = -EINVAL; |
| 1564 | if (nbytes != sizeof(struct fuse_out_header)) |
| 1565 | goto err_unlock; |
| 1566 | |
| 1567 | if (oh.error == -ENOSYS) |
| 1568 | fc->no_interrupt = 1; |
| 1569 | else if (oh.error == -EAGAIN) |
| 1570 | queue_interrupt(fc, req); |
| 1571 | |
| 1572 | spin_unlock(&fc->lock); |
Miklos Szeredi | dd3bb14 | 2010-05-25 15:06:06 +0200 | [diff] [blame] | 1573 | fuse_copy_finish(cs); |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 1574 | return nbytes; |
| 1575 | } |
| 1576 | |
| 1577 | req->state = FUSE_REQ_WRITING; |
Miklos Szeredi | d77a1d5 | 2006-01-16 22:14:31 -0800 | [diff] [blame] | 1578 | list_move(&req->list, &fc->io); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1579 | req->out.h = oh; |
| 1580 | req->locked = 1; |
Miklos Szeredi | dd3bb14 | 2010-05-25 15:06:06 +0200 | [diff] [blame] | 1581 | cs->req = req; |
Miklos Szeredi | ce534fb | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 1582 | if (!req->out.page_replace) |
| 1583 | cs->move_pages = 0; |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 1584 | spin_unlock(&fc->lock); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1585 | |
Miklos Szeredi | dd3bb14 | 2010-05-25 15:06:06 +0200 | [diff] [blame] | 1586 | err = copy_out_args(cs, &req->out, nbytes); |
| 1587 | fuse_copy_finish(cs); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1588 | |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 1589 | spin_lock(&fc->lock); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1590 | req->locked = 0; |
| 1591 | if (!err) { |
Miklos Szeredi | f9a2842 | 2006-06-25 05:48:53 -0700 | [diff] [blame] | 1592 | if (req->aborted) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1593 | err = -ENOENT; |
Miklos Szeredi | f9a2842 | 2006-06-25 05:48:53 -0700 | [diff] [blame] | 1594 | } else if (!req->aborted) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1595 | req->out.h.error = -EIO; |
| 1596 | request_end(fc, req); |
| 1597 | |
| 1598 | return err ? err : nbytes; |
| 1599 | |
| 1600 | err_unlock: |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 1601 | spin_unlock(&fc->lock); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1602 | err_finish: |
Miklos Szeredi | dd3bb14 | 2010-05-25 15:06:06 +0200 | [diff] [blame] | 1603 | fuse_copy_finish(cs); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1604 | return err; |
| 1605 | } |
| 1606 | |
Miklos Szeredi | dd3bb14 | 2010-05-25 15:06:06 +0200 | [diff] [blame] | 1607 | static ssize_t fuse_dev_write(struct kiocb *iocb, const struct iovec *iov, |
| 1608 | unsigned long nr_segs, loff_t pos) |
| 1609 | { |
| 1610 | struct fuse_copy_state cs; |
| 1611 | struct fuse_conn *fc = fuse_get_conn(iocb->ki_filp); |
| 1612 | if (!fc) |
| 1613 | return -EPERM; |
| 1614 | |
Miklos Szeredi | c302162 | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 1615 | fuse_copy_init(&cs, fc, 0, iov, nr_segs); |
Miklos Szeredi | dd3bb14 | 2010-05-25 15:06:06 +0200 | [diff] [blame] | 1616 | |
| 1617 | return fuse_dev_do_write(fc, &cs, iov_length(iov, nr_segs)); |
| 1618 | } |
| 1619 | |
| 1620 | static ssize_t fuse_dev_splice_write(struct pipe_inode_info *pipe, |
| 1621 | struct file *out, loff_t *ppos, |
| 1622 | size_t len, unsigned int flags) |
| 1623 | { |
| 1624 | unsigned nbuf; |
| 1625 | unsigned idx; |
| 1626 | struct pipe_buffer *bufs; |
| 1627 | struct fuse_copy_state cs; |
| 1628 | struct fuse_conn *fc; |
| 1629 | size_t rem; |
| 1630 | ssize_t ret; |
| 1631 | |
| 1632 | fc = fuse_get_conn(out); |
| 1633 | if (!fc) |
| 1634 | return -EPERM; |
| 1635 | |
| 1636 | bufs = kmalloc(pipe->buffers * sizeof (struct pipe_buffer), GFP_KERNEL); |
| 1637 | if (!bufs) |
| 1638 | return -ENOMEM; |
| 1639 | |
| 1640 | pipe_lock(pipe); |
| 1641 | nbuf = 0; |
| 1642 | rem = 0; |
| 1643 | for (idx = 0; idx < pipe->nrbufs && rem < len; idx++) |
| 1644 | rem += pipe->bufs[(pipe->curbuf + idx) & (pipe->buffers - 1)].len; |
| 1645 | |
| 1646 | ret = -EINVAL; |
| 1647 | if (rem < len) { |
| 1648 | pipe_unlock(pipe); |
| 1649 | goto out; |
| 1650 | } |
| 1651 | |
| 1652 | rem = len; |
| 1653 | while (rem) { |
| 1654 | struct pipe_buffer *ibuf; |
| 1655 | struct pipe_buffer *obuf; |
| 1656 | |
| 1657 | BUG_ON(nbuf >= pipe->buffers); |
| 1658 | BUG_ON(!pipe->nrbufs); |
| 1659 | ibuf = &pipe->bufs[pipe->curbuf]; |
| 1660 | obuf = &bufs[nbuf]; |
| 1661 | |
| 1662 | if (rem >= ibuf->len) { |
| 1663 | *obuf = *ibuf; |
| 1664 | ibuf->ops = NULL; |
| 1665 | pipe->curbuf = (pipe->curbuf + 1) & (pipe->buffers - 1); |
| 1666 | pipe->nrbufs--; |
| 1667 | } else { |
| 1668 | ibuf->ops->get(pipe, ibuf); |
| 1669 | *obuf = *ibuf; |
| 1670 | obuf->flags &= ~PIPE_BUF_FLAG_GIFT; |
| 1671 | obuf->len = rem; |
| 1672 | ibuf->offset += obuf->len; |
| 1673 | ibuf->len -= obuf->len; |
| 1674 | } |
| 1675 | nbuf++; |
| 1676 | rem -= obuf->len; |
| 1677 | } |
| 1678 | pipe_unlock(pipe); |
| 1679 | |
Miklos Szeredi | c302162 | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 1680 | fuse_copy_init(&cs, fc, 0, NULL, nbuf); |
Miklos Szeredi | dd3bb14 | 2010-05-25 15:06:06 +0200 | [diff] [blame] | 1681 | cs.pipebufs = bufs; |
Miklos Szeredi | dd3bb14 | 2010-05-25 15:06:06 +0200 | [diff] [blame] | 1682 | cs.pipe = pipe; |
| 1683 | |
Miklos Szeredi | ce534fb | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 1684 | if (flags & SPLICE_F_MOVE) |
| 1685 | cs.move_pages = 1; |
| 1686 | |
Miklos Szeredi | dd3bb14 | 2010-05-25 15:06:06 +0200 | [diff] [blame] | 1687 | ret = fuse_dev_do_write(fc, &cs, len); |
| 1688 | |
| 1689 | for (idx = 0; idx < nbuf; idx++) { |
| 1690 | struct pipe_buffer *buf = &bufs[idx]; |
| 1691 | buf->ops->release(pipe, buf); |
| 1692 | } |
| 1693 | out: |
| 1694 | kfree(bufs); |
| 1695 | return ret; |
| 1696 | } |
| 1697 | |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1698 | static unsigned fuse_dev_poll(struct file *file, poll_table *wait) |
| 1699 | { |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1700 | unsigned mask = POLLOUT | POLLWRNORM; |
Miklos Szeredi | 7025d9a | 2006-04-10 22:54:50 -0700 | [diff] [blame] | 1701 | struct fuse_conn *fc = fuse_get_conn(file); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1702 | if (!fc) |
Miklos Szeredi | 7025d9a | 2006-04-10 22:54:50 -0700 | [diff] [blame] | 1703 | return POLLERR; |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1704 | |
| 1705 | poll_wait(file, &fc->waitq, wait); |
| 1706 | |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 1707 | spin_lock(&fc->lock); |
Miklos Szeredi | 7025d9a | 2006-04-10 22:54:50 -0700 | [diff] [blame] | 1708 | if (!fc->connected) |
| 1709 | mask = POLLERR; |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 1710 | else if (request_pending(fc)) |
Miklos Szeredi | 7025d9a | 2006-04-10 22:54:50 -0700 | [diff] [blame] | 1711 | mask |= POLLIN | POLLRDNORM; |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 1712 | spin_unlock(&fc->lock); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1713 | |
| 1714 | return mask; |
| 1715 | } |
| 1716 | |
Miklos Szeredi | 69a53bf | 2006-01-16 22:14:41 -0800 | [diff] [blame] | 1717 | /* |
| 1718 | * Abort all requests on the given list (pending or processing) |
| 1719 | * |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 1720 | * This function releases and reacquires fc->lock |
Miklos Szeredi | 69a53bf | 2006-01-16 22:14:41 -0800 | [diff] [blame] | 1721 | */ |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1722 | static void end_requests(struct fuse_conn *fc, struct list_head *head) |
Miklos Szeredi | b9ca67b | 2010-09-07 13:42:41 +0200 | [diff] [blame] | 1723 | __releases(fc->lock) |
| 1724 | __acquires(fc->lock) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1725 | { |
| 1726 | while (!list_empty(head)) { |
| 1727 | struct fuse_req *req; |
| 1728 | req = list_entry(head->next, struct fuse_req, list); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1729 | req->out.h.error = -ECONNABORTED; |
| 1730 | request_end(fc, req); |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 1731 | spin_lock(&fc->lock); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1732 | } |
| 1733 | } |
| 1734 | |
Miklos Szeredi | 69a53bf | 2006-01-16 22:14:41 -0800 | [diff] [blame] | 1735 | /* |
| 1736 | * Abort requests under I/O |
| 1737 | * |
Miklos Szeredi | f9a2842 | 2006-06-25 05:48:53 -0700 | [diff] [blame] | 1738 | * The requests are set to aborted and finished, and the request |
Miklos Szeredi | 69a53bf | 2006-01-16 22:14:41 -0800 | [diff] [blame] | 1739 | * waiter is woken up. This will make request_wait_answer() wait |
| 1740 | * until the request is unlocked and then return. |
Miklos Szeredi | 64c6d8e | 2006-01-16 22:14:42 -0800 | [diff] [blame] | 1741 | * |
| 1742 | * If the request is asynchronous, then the end function needs to be |
| 1743 | * called after waiting for the request to be unlocked (if it was |
| 1744 | * locked). |
Miklos Szeredi | 69a53bf | 2006-01-16 22:14:41 -0800 | [diff] [blame] | 1745 | */ |
| 1746 | static void end_io_requests(struct fuse_conn *fc) |
Miklos Szeredi | b9ca67b | 2010-09-07 13:42:41 +0200 | [diff] [blame] | 1747 | __releases(fc->lock) |
| 1748 | __acquires(fc->lock) |
Miklos Szeredi | 69a53bf | 2006-01-16 22:14:41 -0800 | [diff] [blame] | 1749 | { |
| 1750 | while (!list_empty(&fc->io)) { |
Miklos Szeredi | 64c6d8e | 2006-01-16 22:14:42 -0800 | [diff] [blame] | 1751 | struct fuse_req *req = |
| 1752 | list_entry(fc->io.next, struct fuse_req, list); |
| 1753 | void (*end) (struct fuse_conn *, struct fuse_req *) = req->end; |
| 1754 | |
Miklos Szeredi | f9a2842 | 2006-06-25 05:48:53 -0700 | [diff] [blame] | 1755 | req->aborted = 1; |
Miklos Szeredi | 69a53bf | 2006-01-16 22:14:41 -0800 | [diff] [blame] | 1756 | req->out.h.error = -ECONNABORTED; |
| 1757 | req->state = FUSE_REQ_FINISHED; |
| 1758 | list_del_init(&req->list); |
| 1759 | wake_up(&req->waitq); |
Miklos Szeredi | 64c6d8e | 2006-01-16 22:14:42 -0800 | [diff] [blame] | 1760 | if (end) { |
| 1761 | req->end = NULL; |
Miklos Szeredi | 64c6d8e | 2006-01-16 22:14:42 -0800 | [diff] [blame] | 1762 | __fuse_get_request(req); |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 1763 | spin_unlock(&fc->lock); |
Miklos Szeredi | 64c6d8e | 2006-01-16 22:14:42 -0800 | [diff] [blame] | 1764 | wait_event(req->waitq, !req->locked); |
| 1765 | end(fc, req); |
Tejun Heo | e9bb09d | 2008-11-26 12:03:54 +0100 | [diff] [blame] | 1766 | fuse_put_request(fc, req); |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 1767 | spin_lock(&fc->lock); |
Miklos Szeredi | 64c6d8e | 2006-01-16 22:14:42 -0800 | [diff] [blame] | 1768 | } |
Miklos Szeredi | 69a53bf | 2006-01-16 22:14:41 -0800 | [diff] [blame] | 1769 | } |
| 1770 | } |
| 1771 | |
Miklos Szeredi | 595afaf | 2010-09-07 13:42:41 +0200 | [diff] [blame] | 1772 | static void end_queued_requests(struct fuse_conn *fc) |
Miklos Szeredi | b9ca67b | 2010-09-07 13:42:41 +0200 | [diff] [blame] | 1773 | __releases(fc->lock) |
| 1774 | __acquires(fc->lock) |
Miklos Szeredi | 595afaf | 2010-09-07 13:42:41 +0200 | [diff] [blame] | 1775 | { |
| 1776 | fc->max_background = UINT_MAX; |
| 1777 | flush_bg_queue(fc); |
| 1778 | end_requests(fc, &fc->pending); |
| 1779 | end_requests(fc, &fc->processing); |
| 1780 | } |
| 1781 | |
Miklos Szeredi | 69a53bf | 2006-01-16 22:14:41 -0800 | [diff] [blame] | 1782 | /* |
| 1783 | * Abort all requests. |
| 1784 | * |
| 1785 | * Emergency exit in case of a malicious or accidental deadlock, or |
| 1786 | * just a hung filesystem. |
| 1787 | * |
| 1788 | * The same effect is usually achievable through killing the |
| 1789 | * filesystem daemon and all users of the filesystem. The exception |
| 1790 | * is the combination of an asynchronous request and the tricky |
| 1791 | * deadlock (see Documentation/filesystems/fuse.txt). |
| 1792 | * |
| 1793 | * During the aborting, progression of requests from the pending and |
| 1794 | * processing lists onto the io list, and progression of new requests |
| 1795 | * onto the pending list is prevented by req->connected being false. |
| 1796 | * |
| 1797 | * Progression of requests under I/O to the processing list is |
Miklos Szeredi | f9a2842 | 2006-06-25 05:48:53 -0700 | [diff] [blame] | 1798 | * prevented by the req->aborted flag being true for these requests. |
| 1799 | * For this reason requests on the io list must be aborted first. |
Miklos Szeredi | 69a53bf | 2006-01-16 22:14:41 -0800 | [diff] [blame] | 1800 | */ |
| 1801 | void fuse_abort_conn(struct fuse_conn *fc) |
| 1802 | { |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 1803 | spin_lock(&fc->lock); |
Miklos Szeredi | 69a53bf | 2006-01-16 22:14:41 -0800 | [diff] [blame] | 1804 | if (fc->connected) { |
| 1805 | fc->connected = 0; |
Miklos Szeredi | 51eb01e | 2006-06-25 05:48:50 -0700 | [diff] [blame] | 1806 | fc->blocked = 0; |
Miklos Szeredi | 69a53bf | 2006-01-16 22:14:41 -0800 | [diff] [blame] | 1807 | end_io_requests(fc); |
Miklos Szeredi | 595afaf | 2010-09-07 13:42:41 +0200 | [diff] [blame] | 1808 | end_queued_requests(fc); |
Miklos Szeredi | 69a53bf | 2006-01-16 22:14:41 -0800 | [diff] [blame] | 1809 | wake_up_all(&fc->waitq); |
Miklos Szeredi | 51eb01e | 2006-06-25 05:48:50 -0700 | [diff] [blame] | 1810 | wake_up_all(&fc->blocked_waitq); |
Jeff Dike | 385a17b | 2006-04-10 22:54:52 -0700 | [diff] [blame] | 1811 | kill_fasync(&fc->fasync, SIGIO, POLL_IN); |
Miklos Szeredi | 69a53bf | 2006-01-16 22:14:41 -0800 | [diff] [blame] | 1812 | } |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 1813 | spin_unlock(&fc->lock); |
Miklos Szeredi | 69a53bf | 2006-01-16 22:14:41 -0800 | [diff] [blame] | 1814 | } |
Tejun Heo | 08cbf54 | 2009-04-14 10:54:53 +0900 | [diff] [blame] | 1815 | EXPORT_SYMBOL_GPL(fuse_abort_conn); |
Miklos Szeredi | 69a53bf | 2006-01-16 22:14:41 -0800 | [diff] [blame] | 1816 | |
Tejun Heo | 08cbf54 | 2009-04-14 10:54:53 +0900 | [diff] [blame] | 1817 | int fuse_dev_release(struct inode *inode, struct file *file) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1818 | { |
Miklos Szeredi | 0720b31 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 1819 | struct fuse_conn *fc = fuse_get_conn(file); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1820 | if (fc) { |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 1821 | spin_lock(&fc->lock); |
Miklos Szeredi | 1e9a4ed | 2005-09-09 13:10:31 -0700 | [diff] [blame] | 1822 | fc->connected = 0; |
Miklos Szeredi | 595afaf | 2010-09-07 13:42:41 +0200 | [diff] [blame] | 1823 | fc->blocked = 0; |
| 1824 | end_queued_requests(fc); |
| 1825 | wake_up_all(&fc->blocked_waitq); |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 1826 | spin_unlock(&fc->lock); |
Miklos Szeredi | bafa965 | 2006-06-25 05:48:51 -0700 | [diff] [blame] | 1827 | fuse_conn_put(fc); |
Jeff Dike | 385a17b | 2006-04-10 22:54:52 -0700 | [diff] [blame] | 1828 | } |
Miklos Szeredi | f543f25 | 2006-01-16 22:14:35 -0800 | [diff] [blame] | 1829 | |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1830 | return 0; |
| 1831 | } |
Tejun Heo | 08cbf54 | 2009-04-14 10:54:53 +0900 | [diff] [blame] | 1832 | EXPORT_SYMBOL_GPL(fuse_dev_release); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1833 | |
Jeff Dike | 385a17b | 2006-04-10 22:54:52 -0700 | [diff] [blame] | 1834 | static int fuse_dev_fasync(int fd, struct file *file, int on) |
| 1835 | { |
| 1836 | struct fuse_conn *fc = fuse_get_conn(file); |
| 1837 | if (!fc) |
Miklos Szeredi | a87046d | 2006-04-10 22:54:56 -0700 | [diff] [blame] | 1838 | return -EPERM; |
Jeff Dike | 385a17b | 2006-04-10 22:54:52 -0700 | [diff] [blame] | 1839 | |
| 1840 | /* No locking - fasync_helper does its own locking */ |
| 1841 | return fasync_helper(fd, file, on, &fc->fasync); |
| 1842 | } |
| 1843 | |
Arjan van de Ven | 4b6f5d2 | 2006-03-28 01:56:42 -0800 | [diff] [blame] | 1844 | const struct file_operations fuse_dev_operations = { |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1845 | .owner = THIS_MODULE, |
| 1846 | .llseek = no_llseek, |
Badari Pulavarty | ee0b3e6 | 2006-09-30 23:28:47 -0700 | [diff] [blame] | 1847 | .read = do_sync_read, |
| 1848 | .aio_read = fuse_dev_read, |
Miklos Szeredi | c302162 | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 1849 | .splice_read = fuse_dev_splice_read, |
Badari Pulavarty | ee0b3e6 | 2006-09-30 23:28:47 -0700 | [diff] [blame] | 1850 | .write = do_sync_write, |
| 1851 | .aio_write = fuse_dev_write, |
Miklos Szeredi | dd3bb14 | 2010-05-25 15:06:06 +0200 | [diff] [blame] | 1852 | .splice_write = fuse_dev_splice_write, |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1853 | .poll = fuse_dev_poll, |
| 1854 | .release = fuse_dev_release, |
Jeff Dike | 385a17b | 2006-04-10 22:54:52 -0700 | [diff] [blame] | 1855 | .fasync = fuse_dev_fasync, |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1856 | }; |
Tejun Heo | 08cbf54 | 2009-04-14 10:54:53 +0900 | [diff] [blame] | 1857 | EXPORT_SYMBOL_GPL(fuse_dev_operations); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1858 | |
| 1859 | static struct miscdevice fuse_miscdevice = { |
| 1860 | .minor = FUSE_MINOR, |
| 1861 | .name = "fuse", |
| 1862 | .fops = &fuse_dev_operations, |
| 1863 | }; |
| 1864 | |
| 1865 | int __init fuse_dev_init(void) |
| 1866 | { |
| 1867 | int err = -ENOMEM; |
| 1868 | fuse_req_cachep = kmem_cache_create("fuse_request", |
| 1869 | sizeof(struct fuse_req), |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 1870 | 0, 0, NULL); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1871 | if (!fuse_req_cachep) |
| 1872 | goto out; |
| 1873 | |
| 1874 | err = misc_register(&fuse_miscdevice); |
| 1875 | if (err) |
| 1876 | goto out_cache_clean; |
| 1877 | |
| 1878 | return 0; |
| 1879 | |
| 1880 | out_cache_clean: |
| 1881 | kmem_cache_destroy(fuse_req_cachep); |
| 1882 | out: |
| 1883 | return err; |
| 1884 | } |
| 1885 | |
| 1886 | void fuse_dev_cleanup(void) |
| 1887 | { |
| 1888 | misc_deregister(&fuse_miscdevice); |
| 1889 | kmem_cache_destroy(fuse_req_cachep); |
| 1890 | } |