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 | |
Maxim Patlasov | 4250c06 | 2012-10-26 19:48:07 +0400 | [diff] [blame] | 37 | static void fuse_request_init(struct fuse_req *req, struct page **pages, |
Maxim Patlasov | b2430d7 | 2012-10-26 19:49:24 +0400 | [diff] [blame] | 38 | struct fuse_page_desc *page_descs, |
Maxim Patlasov | 4250c06 | 2012-10-26 19:48:07 +0400 | [diff] [blame] | 39 | unsigned npages) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 40 | { |
| 41 | memset(req, 0, sizeof(*req)); |
Maxim Patlasov | 4250c06 | 2012-10-26 19:48:07 +0400 | [diff] [blame] | 42 | memset(pages, 0, sizeof(*pages) * npages); |
Maxim Patlasov | b2430d7 | 2012-10-26 19:49:24 +0400 | [diff] [blame] | 43 | memset(page_descs, 0, sizeof(*page_descs) * npages); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 44 | INIT_LIST_HEAD(&req->list); |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 45 | INIT_LIST_HEAD(&req->intr_entry); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 46 | init_waitqueue_head(&req->waitq); |
| 47 | atomic_set(&req->count, 1); |
Maxim Patlasov | 4250c06 | 2012-10-26 19:48:07 +0400 | [diff] [blame] | 48 | req->pages = pages; |
Maxim Patlasov | b2430d7 | 2012-10-26 19:49:24 +0400 | [diff] [blame] | 49 | req->page_descs = page_descs; |
Maxim Patlasov | 4250c06 | 2012-10-26 19:48:07 +0400 | [diff] [blame] | 50 | req->max_pages = npages; |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 51 | } |
| 52 | |
Maxim Patlasov | 4250c06 | 2012-10-26 19:48:07 +0400 | [diff] [blame] | 53 | static struct fuse_req *__fuse_request_alloc(unsigned npages, gfp_t flags) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 54 | { |
Maxim Patlasov | 4250c06 | 2012-10-26 19:48:07 +0400 | [diff] [blame] | 55 | struct fuse_req *req = kmem_cache_alloc(fuse_req_cachep, flags); |
| 56 | if (req) { |
| 57 | struct page **pages; |
Maxim Patlasov | b2430d7 | 2012-10-26 19:49:24 +0400 | [diff] [blame] | 58 | struct fuse_page_desc *page_descs; |
Maxim Patlasov | 4250c06 | 2012-10-26 19:48:07 +0400 | [diff] [blame] | 59 | |
Maxim Patlasov | b2430d7 | 2012-10-26 19:49:24 +0400 | [diff] [blame] | 60 | if (npages <= FUSE_REQ_INLINE_PAGES) { |
Maxim Patlasov | 4250c06 | 2012-10-26 19:48:07 +0400 | [diff] [blame] | 61 | pages = req->inline_pages; |
Maxim Patlasov | b2430d7 | 2012-10-26 19:49:24 +0400 | [diff] [blame] | 62 | page_descs = req->inline_page_descs; |
| 63 | } else { |
Maxim Patlasov | 4250c06 | 2012-10-26 19:48:07 +0400 | [diff] [blame] | 64 | pages = kmalloc(sizeof(struct page *) * npages, flags); |
Maxim Patlasov | b2430d7 | 2012-10-26 19:49:24 +0400 | [diff] [blame] | 65 | page_descs = kmalloc(sizeof(struct fuse_page_desc) * |
| 66 | npages, flags); |
| 67 | } |
Maxim Patlasov | 4250c06 | 2012-10-26 19:48:07 +0400 | [diff] [blame] | 68 | |
Maxim Patlasov | b2430d7 | 2012-10-26 19:49:24 +0400 | [diff] [blame] | 69 | if (!pages || !page_descs) { |
| 70 | kfree(pages); |
| 71 | kfree(page_descs); |
Maxim Patlasov | 4250c06 | 2012-10-26 19:48:07 +0400 | [diff] [blame] | 72 | kmem_cache_free(fuse_req_cachep, req); |
| 73 | return NULL; |
| 74 | } |
| 75 | |
Maxim Patlasov | b2430d7 | 2012-10-26 19:49:24 +0400 | [diff] [blame] | 76 | fuse_request_init(req, pages, page_descs, npages); |
Maxim Patlasov | 4250c06 | 2012-10-26 19:48:07 +0400 | [diff] [blame] | 77 | } |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 78 | return req; |
| 79 | } |
Maxim Patlasov | 4250c06 | 2012-10-26 19:48:07 +0400 | [diff] [blame] | 80 | |
| 81 | struct fuse_req *fuse_request_alloc(unsigned npages) |
| 82 | { |
| 83 | return __fuse_request_alloc(npages, GFP_KERNEL); |
| 84 | } |
Tejun Heo | 08cbf54 | 2009-04-14 10:54:53 +0900 | [diff] [blame] | 85 | EXPORT_SYMBOL_GPL(fuse_request_alloc); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 86 | |
Maxim Patlasov | 4250c06 | 2012-10-26 19:48:07 +0400 | [diff] [blame] | 87 | struct fuse_req *fuse_request_alloc_nofs(unsigned npages) |
Miklos Szeredi | 3be5a52 | 2008-04-30 00:54:41 -0700 | [diff] [blame] | 88 | { |
Maxim Patlasov | 4250c06 | 2012-10-26 19:48:07 +0400 | [diff] [blame] | 89 | return __fuse_request_alloc(npages, GFP_NOFS); |
Miklos Szeredi | 3be5a52 | 2008-04-30 00:54:41 -0700 | [diff] [blame] | 90 | } |
| 91 | |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 92 | void fuse_request_free(struct fuse_req *req) |
| 93 | { |
Maxim Patlasov | b2430d7 | 2012-10-26 19:49:24 +0400 | [diff] [blame] | 94 | if (req->pages != req->inline_pages) { |
Maxim Patlasov | 4250c06 | 2012-10-26 19:48:07 +0400 | [diff] [blame] | 95 | kfree(req->pages); |
Maxim Patlasov | b2430d7 | 2012-10-26 19:49:24 +0400 | [diff] [blame] | 96 | kfree(req->page_descs); |
| 97 | } |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 98 | kmem_cache_free(fuse_req_cachep, req); |
| 99 | } |
| 100 | |
Miklos Szeredi | 8bfc016 | 2006-01-16 22:14:28 -0800 | [diff] [blame] | 101 | static void block_sigs(sigset_t *oldset) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 102 | { |
| 103 | sigset_t mask; |
| 104 | |
| 105 | siginitsetinv(&mask, sigmask(SIGKILL)); |
| 106 | sigprocmask(SIG_BLOCK, &mask, oldset); |
| 107 | } |
| 108 | |
Miklos Szeredi | 8bfc016 | 2006-01-16 22:14:28 -0800 | [diff] [blame] | 109 | static void restore_sigs(sigset_t *oldset) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 110 | { |
| 111 | sigprocmask(SIG_SETMASK, oldset, NULL); |
| 112 | } |
| 113 | |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 114 | static void __fuse_get_request(struct fuse_req *req) |
| 115 | { |
| 116 | atomic_inc(&req->count); |
| 117 | } |
| 118 | |
| 119 | /* Must be called with > 1 refcount */ |
| 120 | static void __fuse_put_request(struct fuse_req *req) |
| 121 | { |
| 122 | BUG_ON(atomic_read(&req->count) < 2); |
| 123 | atomic_dec(&req->count); |
| 124 | } |
| 125 | |
Miklos Szeredi | 33649c9 | 2006-06-25 05:48:52 -0700 | [diff] [blame] | 126 | static void fuse_req_init_context(struct fuse_req *req) |
| 127 | { |
Eric W. Biederman | 499dcf2 | 2012-02-07 16:26:03 -0800 | [diff] [blame] | 128 | req->in.h.uid = from_kuid_munged(&init_user_ns, current_fsuid()); |
| 129 | req->in.h.gid = from_kgid_munged(&init_user_ns, current_fsgid()); |
Miklos Szeredi | 33649c9 | 2006-06-25 05:48:52 -0700 | [diff] [blame] | 130 | req->in.h.pid = current->pid; |
| 131 | } |
| 132 | |
Maxim Patlasov | b111c8c | 2012-10-26 19:48:30 +0400 | [diff] [blame] | 133 | struct fuse_req *fuse_get_req(struct fuse_conn *fc, unsigned npages) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 134 | { |
Miklos Szeredi | 08a53cd | 2006-04-10 22:54:59 -0700 | [diff] [blame] | 135 | struct fuse_req *req; |
| 136 | sigset_t oldset; |
Miklos Szeredi | 9bc5ddd | 2006-04-11 21:16:09 +0200 | [diff] [blame] | 137 | int intr; |
Miklos Szeredi | 08a53cd | 2006-04-10 22:54:59 -0700 | [diff] [blame] | 138 | int err; |
| 139 | |
Miklos Szeredi | 9bc5ddd | 2006-04-11 21:16:09 +0200 | [diff] [blame] | 140 | atomic_inc(&fc->num_waiting); |
Miklos Szeredi | 08a53cd | 2006-04-10 22:54:59 -0700 | [diff] [blame] | 141 | block_sigs(&oldset); |
Miklos Szeredi | 9bc5ddd | 2006-04-11 21:16:09 +0200 | [diff] [blame] | 142 | intr = wait_event_interruptible(fc->blocked_waitq, !fc->blocked); |
Miklos Szeredi | 08a53cd | 2006-04-10 22:54:59 -0700 | [diff] [blame] | 143 | restore_sigs(&oldset); |
Miklos Szeredi | 9bc5ddd | 2006-04-11 21:16:09 +0200 | [diff] [blame] | 144 | err = -EINTR; |
| 145 | if (intr) |
| 146 | goto out; |
Miklos Szeredi | 08a53cd | 2006-04-10 22:54:59 -0700 | [diff] [blame] | 147 | |
Miklos Szeredi | 51eb01e | 2006-06-25 05:48:50 -0700 | [diff] [blame] | 148 | err = -ENOTCONN; |
| 149 | if (!fc->connected) |
| 150 | goto out; |
| 151 | |
Maxim Patlasov | b111c8c | 2012-10-26 19:48:30 +0400 | [diff] [blame] | 152 | req = fuse_request_alloc(npages); |
Miklos Szeredi | 9bc5ddd | 2006-04-11 21:16:09 +0200 | [diff] [blame] | 153 | err = -ENOMEM; |
Miklos Szeredi | ce1d5a4 | 2006-04-10 22:54:58 -0700 | [diff] [blame] | 154 | if (!req) |
Miklos Szeredi | 9bc5ddd | 2006-04-11 21:16:09 +0200 | [diff] [blame] | 155 | goto out; |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 156 | |
Miklos Szeredi | 33649c9 | 2006-06-25 05:48:52 -0700 | [diff] [blame] | 157 | fuse_req_init_context(req); |
Miklos Szeredi | 9bc5ddd | 2006-04-11 21:16:09 +0200 | [diff] [blame] | 158 | req->waiting = 1; |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 159 | return req; |
Miklos Szeredi | 9bc5ddd | 2006-04-11 21:16:09 +0200 | [diff] [blame] | 160 | |
| 161 | out: |
| 162 | atomic_dec(&fc->num_waiting); |
| 163 | return ERR_PTR(err); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 164 | } |
Tejun Heo | 08cbf54 | 2009-04-14 10:54:53 +0900 | [diff] [blame] | 165 | EXPORT_SYMBOL_GPL(fuse_get_req); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 166 | |
Miklos Szeredi | 33649c9 | 2006-06-25 05:48:52 -0700 | [diff] [blame] | 167 | /* |
| 168 | * Return request in fuse_file->reserved_req. However that may |
| 169 | * currently be in use. If that is the case, wait for it to become |
| 170 | * available. |
| 171 | */ |
| 172 | static struct fuse_req *get_reserved_req(struct fuse_conn *fc, |
| 173 | struct file *file) |
| 174 | { |
| 175 | struct fuse_req *req = NULL; |
| 176 | struct fuse_file *ff = file->private_data; |
| 177 | |
| 178 | do { |
Miklos Szeredi | de5e3de | 2007-10-16 23:31:00 -0700 | [diff] [blame] | 179 | wait_event(fc->reserved_req_waitq, ff->reserved_req); |
Miklos Szeredi | 33649c9 | 2006-06-25 05:48:52 -0700 | [diff] [blame] | 180 | spin_lock(&fc->lock); |
| 181 | if (ff->reserved_req) { |
| 182 | req = ff->reserved_req; |
| 183 | ff->reserved_req = NULL; |
Al Viro | cb0942b | 2012-08-27 14:48:26 -0400 | [diff] [blame] | 184 | req->stolen_file = get_file(file); |
Miklos Szeredi | 33649c9 | 2006-06-25 05:48:52 -0700 | [diff] [blame] | 185 | } |
| 186 | spin_unlock(&fc->lock); |
| 187 | } while (!req); |
| 188 | |
| 189 | return req; |
| 190 | } |
| 191 | |
| 192 | /* |
| 193 | * Put stolen request back into fuse_file->reserved_req |
| 194 | */ |
| 195 | static void put_reserved_req(struct fuse_conn *fc, struct fuse_req *req) |
| 196 | { |
| 197 | struct file *file = req->stolen_file; |
| 198 | struct fuse_file *ff = file->private_data; |
| 199 | |
| 200 | spin_lock(&fc->lock); |
Maxim Patlasov | b2430d7 | 2012-10-26 19:49:24 +0400 | [diff] [blame] | 201 | fuse_request_init(req, req->pages, req->page_descs, req->max_pages); |
Miklos Szeredi | 33649c9 | 2006-06-25 05:48:52 -0700 | [diff] [blame] | 202 | BUG_ON(ff->reserved_req); |
| 203 | ff->reserved_req = req; |
Miklos Szeredi | de5e3de | 2007-10-16 23:31:00 -0700 | [diff] [blame] | 204 | wake_up_all(&fc->reserved_req_waitq); |
Miklos Szeredi | 33649c9 | 2006-06-25 05:48:52 -0700 | [diff] [blame] | 205 | spin_unlock(&fc->lock); |
| 206 | fput(file); |
| 207 | } |
| 208 | |
| 209 | /* |
| 210 | * Gets a requests for a file operation, always succeeds |
| 211 | * |
| 212 | * This is used for sending the FLUSH request, which must get to |
| 213 | * userspace, due to POSIX locks which may need to be unlocked. |
| 214 | * |
| 215 | * If allocation fails due to OOM, use the reserved request in |
| 216 | * fuse_file. |
| 217 | * |
| 218 | * This is very unlikely to deadlock accidentally, since the |
| 219 | * filesystem should not have it's own file open. If deadlock is |
| 220 | * intentional, it can still be broken by "aborting" the filesystem. |
| 221 | */ |
Maxim Patlasov | b111c8c | 2012-10-26 19:48:30 +0400 | [diff] [blame] | 222 | struct fuse_req *fuse_get_req_nofail_nopages(struct fuse_conn *fc, |
| 223 | struct file *file) |
Miklos Szeredi | 33649c9 | 2006-06-25 05:48:52 -0700 | [diff] [blame] | 224 | { |
| 225 | struct fuse_req *req; |
| 226 | |
| 227 | atomic_inc(&fc->num_waiting); |
| 228 | wait_event(fc->blocked_waitq, !fc->blocked); |
Maxim Patlasov | b111c8c | 2012-10-26 19:48:30 +0400 | [diff] [blame] | 229 | req = fuse_request_alloc(0); |
Miklos Szeredi | 33649c9 | 2006-06-25 05:48:52 -0700 | [diff] [blame] | 230 | if (!req) |
| 231 | req = get_reserved_req(fc, file); |
| 232 | |
| 233 | fuse_req_init_context(req); |
| 234 | req->waiting = 1; |
| 235 | return req; |
| 236 | } |
| 237 | |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 238 | void fuse_put_request(struct fuse_conn *fc, struct fuse_req *req) |
| 239 | { |
Miklos Szeredi | 7128ec2 | 2006-02-04 23:27:40 -0800 | [diff] [blame] | 240 | if (atomic_dec_and_test(&req->count)) { |
Miklos Szeredi | 9bc5ddd | 2006-04-11 21:16:09 +0200 | [diff] [blame] | 241 | if (req->waiting) |
| 242 | atomic_dec(&fc->num_waiting); |
Miklos Szeredi | 33649c9 | 2006-06-25 05:48:52 -0700 | [diff] [blame] | 243 | |
| 244 | if (req->stolen_file) |
| 245 | put_reserved_req(fc, req); |
| 246 | else |
| 247 | fuse_request_free(req); |
Miklos Szeredi | 7128ec2 | 2006-02-04 23:27:40 -0800 | [diff] [blame] | 248 | } |
| 249 | } |
Tejun Heo | 08cbf54 | 2009-04-14 10:54:53 +0900 | [diff] [blame] | 250 | EXPORT_SYMBOL_GPL(fuse_put_request); |
Miklos Szeredi | 7128ec2 | 2006-02-04 23:27:40 -0800 | [diff] [blame] | 251 | |
Miklos Szeredi | d12def1 | 2008-02-06 01:38:39 -0800 | [diff] [blame] | 252 | static unsigned len_args(unsigned numargs, struct fuse_arg *args) |
| 253 | { |
| 254 | unsigned nbytes = 0; |
| 255 | unsigned i; |
| 256 | |
| 257 | for (i = 0; i < numargs; i++) |
| 258 | nbytes += args[i].size; |
| 259 | |
| 260 | return nbytes; |
| 261 | } |
| 262 | |
| 263 | static u64 fuse_get_unique(struct fuse_conn *fc) |
| 264 | { |
| 265 | fc->reqctr++; |
| 266 | /* zero is special */ |
| 267 | if (fc->reqctr == 0) |
| 268 | fc->reqctr = 1; |
| 269 | |
| 270 | return fc->reqctr; |
| 271 | } |
| 272 | |
| 273 | static void queue_request(struct fuse_conn *fc, struct fuse_req *req) |
| 274 | { |
Miklos Szeredi | d12def1 | 2008-02-06 01:38:39 -0800 | [diff] [blame] | 275 | req->in.h.len = sizeof(struct fuse_in_header) + |
| 276 | len_args(req->in.numargs, (struct fuse_arg *) req->in.args); |
| 277 | list_add_tail(&req->list, &fc->pending); |
| 278 | req->state = FUSE_REQ_PENDING; |
| 279 | if (!req->waiting) { |
| 280 | req->waiting = 1; |
| 281 | atomic_inc(&fc->num_waiting); |
| 282 | } |
| 283 | wake_up(&fc->waitq); |
| 284 | kill_fasync(&fc->fasync, SIGIO, POLL_IN); |
| 285 | } |
| 286 | |
Miklos Szeredi | 07e77dc | 2010-12-07 20:16:56 +0100 | [diff] [blame] | 287 | void fuse_queue_forget(struct fuse_conn *fc, struct fuse_forget_link *forget, |
| 288 | u64 nodeid, u64 nlookup) |
| 289 | { |
Miklos Szeredi | 02c048b | 2010-12-07 20:16:56 +0100 | [diff] [blame] | 290 | forget->forget_one.nodeid = nodeid; |
| 291 | forget->forget_one.nlookup = nlookup; |
Miklos Szeredi | 07e77dc | 2010-12-07 20:16:56 +0100 | [diff] [blame] | 292 | |
| 293 | spin_lock(&fc->lock); |
Miklos Szeredi | 5dfcc87 | 2011-09-12 09:38:03 +0200 | [diff] [blame] | 294 | if (fc->connected) { |
| 295 | fc->forget_list_tail->next = forget; |
| 296 | fc->forget_list_tail = forget; |
| 297 | wake_up(&fc->waitq); |
| 298 | kill_fasync(&fc->fasync, SIGIO, POLL_IN); |
| 299 | } else { |
| 300 | kfree(forget); |
| 301 | } |
Miklos Szeredi | 07e77dc | 2010-12-07 20:16:56 +0100 | [diff] [blame] | 302 | spin_unlock(&fc->lock); |
| 303 | } |
| 304 | |
Miklos Szeredi | d12def1 | 2008-02-06 01:38:39 -0800 | [diff] [blame] | 305 | static void flush_bg_queue(struct fuse_conn *fc) |
| 306 | { |
Csaba Henk | 7a6d3c8 | 2009-07-01 17:28:41 -0700 | [diff] [blame] | 307 | while (fc->active_background < fc->max_background && |
Miklos Szeredi | d12def1 | 2008-02-06 01:38:39 -0800 | [diff] [blame] | 308 | !list_empty(&fc->bg_queue)) { |
| 309 | struct fuse_req *req; |
| 310 | |
| 311 | req = list_entry(fc->bg_queue.next, struct fuse_req, list); |
| 312 | list_del(&req->list); |
| 313 | fc->active_background++; |
Miklos Szeredi | 2d45ba3 | 2010-07-12 14:41:40 +0200 | [diff] [blame] | 314 | req->in.h.unique = fuse_get_unique(fc); |
Miklos Szeredi | d12def1 | 2008-02-06 01:38:39 -0800 | [diff] [blame] | 315 | queue_request(fc, req); |
| 316 | } |
| 317 | } |
| 318 | |
Miklos Szeredi | 6dbbcb1 | 2006-04-26 10:49:06 +0200 | [diff] [blame] | 319 | /* |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 320 | * This function is called when a request is finished. Either a reply |
Miklos Szeredi | f9a2842 | 2006-06-25 05:48:53 -0700 | [diff] [blame] | 321 | * 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] | 322 | * occurred during communication with userspace, or the device file |
Miklos Szeredi | 51eb01e | 2006-06-25 05:48:50 -0700 | [diff] [blame] | 323 | * was closed. The requester thread is woken up (if still waiting), |
| 324 | * the 'end' callback is called if given, else the reference to the |
| 325 | * request is released |
Miklos Szeredi | 7128ec2 | 2006-02-04 23:27:40 -0800 | [diff] [blame] | 326 | * |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 327 | * Called with fc->lock, unlocks it |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 328 | */ |
| 329 | static void request_end(struct fuse_conn *fc, struct fuse_req *req) |
Miklos Szeredi | b9ca67b | 2010-09-07 13:42:41 +0200 | [diff] [blame] | 330 | __releases(fc->lock) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 331 | { |
Miklos Szeredi | 51eb01e | 2006-06-25 05:48:50 -0700 | [diff] [blame] | 332 | void (*end) (struct fuse_conn *, struct fuse_req *) = req->end; |
| 333 | req->end = NULL; |
Miklos Szeredi | d77a1d5 | 2006-01-16 22:14:31 -0800 | [diff] [blame] | 334 | list_del(&req->list); |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 335 | list_del(&req->intr_entry); |
Miklos Szeredi | 83cfd49 | 2006-01-16 22:14:31 -0800 | [diff] [blame] | 336 | req->state = FUSE_REQ_FINISHED; |
Miklos Szeredi | 51eb01e | 2006-06-25 05:48:50 -0700 | [diff] [blame] | 337 | if (req->background) { |
Csaba Henk | 7a6d3c8 | 2009-07-01 17:28:41 -0700 | [diff] [blame] | 338 | if (fc->num_background == fc->max_background) { |
Miklos Szeredi | 51eb01e | 2006-06-25 05:48:50 -0700 | [diff] [blame] | 339 | fc->blocked = 0; |
| 340 | wake_up_all(&fc->blocked_waitq); |
| 341 | } |
Csaba Henk | 7a6d3c8 | 2009-07-01 17:28:41 -0700 | [diff] [blame] | 342 | if (fc->num_background == fc->congestion_threshold && |
Tejun Heo | a325f9b | 2009-04-14 10:54:52 +0900 | [diff] [blame] | 343 | fc->connected && fc->bdi_initialized) { |
Jens Axboe | 8aa7e84 | 2009-07-09 14:52:32 +0200 | [diff] [blame] | 344 | clear_bdi_congested(&fc->bdi, BLK_RW_SYNC); |
| 345 | clear_bdi_congested(&fc->bdi, BLK_RW_ASYNC); |
Miklos Szeredi | f92b99b | 2007-10-16 23:30:59 -0700 | [diff] [blame] | 346 | } |
Miklos Szeredi | 51eb01e | 2006-06-25 05:48:50 -0700 | [diff] [blame] | 347 | fc->num_background--; |
Miklos Szeredi | d12def1 | 2008-02-06 01:38:39 -0800 | [diff] [blame] | 348 | fc->active_background--; |
| 349 | flush_bg_queue(fc); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 350 | } |
Miklos Szeredi | 51eb01e | 2006-06-25 05:48:50 -0700 | [diff] [blame] | 351 | spin_unlock(&fc->lock); |
Miklos Szeredi | 51eb01e | 2006-06-25 05:48:50 -0700 | [diff] [blame] | 352 | wake_up(&req->waitq); |
| 353 | if (end) |
| 354 | end(fc, req); |
Tejun Heo | e9bb09d | 2008-11-26 12:03:54 +0100 | [diff] [blame] | 355 | fuse_put_request(fc, req); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 356 | } |
| 357 | |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 358 | static void wait_answer_interruptible(struct fuse_conn *fc, |
| 359 | struct fuse_req *req) |
Miklos Szeredi | b9ca67b | 2010-09-07 13:42:41 +0200 | [diff] [blame] | 360 | __releases(fc->lock) |
| 361 | __acquires(fc->lock) |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 362 | { |
| 363 | if (signal_pending(current)) |
| 364 | return; |
| 365 | |
| 366 | spin_unlock(&fc->lock); |
| 367 | wait_event_interruptible(req->waitq, req->state == FUSE_REQ_FINISHED); |
| 368 | spin_lock(&fc->lock); |
| 369 | } |
| 370 | |
| 371 | static void queue_interrupt(struct fuse_conn *fc, struct fuse_req *req) |
| 372 | { |
| 373 | list_add_tail(&req->intr_entry, &fc->interrupts); |
| 374 | wake_up(&fc->waitq); |
| 375 | kill_fasync(&fc->fasync, SIGIO, POLL_IN); |
| 376 | } |
| 377 | |
Miklos Szeredi | 7c352bd | 2005-09-09 13:10:39 -0700 | [diff] [blame] | 378 | 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] | 379 | __releases(fc->lock) |
| 380 | __acquires(fc->lock) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 381 | { |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 382 | if (!fc->no_interrupt) { |
| 383 | /* Any signal may interrupt this */ |
| 384 | wait_answer_interruptible(fc, req); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 385 | |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 386 | if (req->aborted) |
| 387 | goto aborted; |
| 388 | if (req->state == FUSE_REQ_FINISHED) |
| 389 | return; |
| 390 | |
| 391 | req->interrupted = 1; |
| 392 | if (req->state == FUSE_REQ_SENT) |
| 393 | queue_interrupt(fc, req); |
| 394 | } |
| 395 | |
Miklos Szeredi | a131de0 | 2007-10-16 23:31:04 -0700 | [diff] [blame] | 396 | if (!req->force) { |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 397 | sigset_t oldset; |
| 398 | |
| 399 | /* Only fatal signals may interrupt this */ |
Miklos Szeredi | 51eb01e | 2006-06-25 05:48:50 -0700 | [diff] [blame] | 400 | block_sigs(&oldset); |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 401 | wait_answer_interruptible(fc, req); |
Miklos Szeredi | 51eb01e | 2006-06-25 05:48:50 -0700 | [diff] [blame] | 402 | restore_sigs(&oldset); |
Miklos Szeredi | a131de0 | 2007-10-16 23:31:04 -0700 | [diff] [blame] | 403 | |
| 404 | if (req->aborted) |
| 405 | goto aborted; |
| 406 | if (req->state == FUSE_REQ_FINISHED) |
| 407 | return; |
| 408 | |
| 409 | /* Request is not yet in userspace, bail out */ |
| 410 | if (req->state == FUSE_REQ_PENDING) { |
| 411 | list_del(&req->list); |
| 412 | __fuse_put_request(req); |
| 413 | req->out.h.error = -EINTR; |
| 414 | return; |
| 415 | } |
Miklos Szeredi | 51eb01e | 2006-06-25 05:48:50 -0700 | [diff] [blame] | 416 | } |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 417 | |
Miklos Szeredi | a131de0 | 2007-10-16 23:31:04 -0700 | [diff] [blame] | 418 | /* |
| 419 | * Either request is already in userspace, or it was forced. |
| 420 | * Wait it out. |
| 421 | */ |
| 422 | spin_unlock(&fc->lock); |
| 423 | wait_event(req->waitq, req->state == FUSE_REQ_FINISHED); |
| 424 | spin_lock(&fc->lock); |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 425 | |
Miklos Szeredi | a131de0 | 2007-10-16 23:31:04 -0700 | [diff] [blame] | 426 | if (!req->aborted) |
| 427 | return; |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 428 | |
| 429 | aborted: |
Miklos Szeredi | a131de0 | 2007-10-16 23:31:04 -0700 | [diff] [blame] | 430 | BUG_ON(req->state != FUSE_REQ_FINISHED); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 431 | if (req->locked) { |
| 432 | /* This is uninterruptible sleep, because data is |
| 433 | being copied to/from the buffers of req. During |
| 434 | locked state, there mustn't be any filesystem |
| 435 | operation (e.g. page fault), since that could lead |
| 436 | to deadlock */ |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 437 | spin_unlock(&fc->lock); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 438 | wait_event(req->waitq, !req->locked); |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 439 | spin_lock(&fc->lock); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 440 | } |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 441 | } |
| 442 | |
Eric Wong | 6a4e922 | 2013-02-04 13:04:44 +0000 | [diff] [blame] | 443 | static void __fuse_request_send(struct fuse_conn *fc, struct fuse_req *req) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 444 | { |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 445 | spin_lock(&fc->lock); |
Miklos Szeredi | 1e9a4ed | 2005-09-09 13:10:31 -0700 | [diff] [blame] | 446 | if (!fc->connected) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 447 | req->out.h.error = -ENOTCONN; |
| 448 | else if (fc->conn_error) |
| 449 | req->out.h.error = -ECONNREFUSED; |
| 450 | else { |
Miklos Szeredi | 2d45ba3 | 2010-07-12 14:41:40 +0200 | [diff] [blame] | 451 | req->in.h.unique = fuse_get_unique(fc); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 452 | queue_request(fc, req); |
| 453 | /* acquire extra reference, since request is still needed |
| 454 | after request_end() */ |
| 455 | __fuse_get_request(req); |
| 456 | |
Miklos Szeredi | 7c352bd | 2005-09-09 13:10:39 -0700 | [diff] [blame] | 457 | request_wait_answer(fc, req); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 458 | } |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 459 | spin_unlock(&fc->lock); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 460 | } |
Eric Wong | 6a4e922 | 2013-02-04 13:04:44 +0000 | [diff] [blame] | 461 | |
| 462 | void fuse_request_send(struct fuse_conn *fc, struct fuse_req *req) |
| 463 | { |
| 464 | req->isreply = 1; |
| 465 | __fuse_request_send(fc, req); |
| 466 | } |
Tejun Heo | 08cbf54 | 2009-04-14 10:54:53 +0900 | [diff] [blame] | 467 | EXPORT_SYMBOL_GPL(fuse_request_send); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 468 | |
Tejun Heo | b93f858 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 469 | static void fuse_request_send_nowait_locked(struct fuse_conn *fc, |
| 470 | struct fuse_req *req) |
Miklos Szeredi | d12def1 | 2008-02-06 01:38:39 -0800 | [diff] [blame] | 471 | { |
| 472 | req->background = 1; |
| 473 | fc->num_background++; |
Csaba Henk | 7a6d3c8 | 2009-07-01 17:28:41 -0700 | [diff] [blame] | 474 | if (fc->num_background == fc->max_background) |
Miklos Szeredi | d12def1 | 2008-02-06 01:38:39 -0800 | [diff] [blame] | 475 | fc->blocked = 1; |
Csaba Henk | 7a6d3c8 | 2009-07-01 17:28:41 -0700 | [diff] [blame] | 476 | if (fc->num_background == fc->congestion_threshold && |
Tejun Heo | a325f9b | 2009-04-14 10:54:52 +0900 | [diff] [blame] | 477 | fc->bdi_initialized) { |
Jens Axboe | 8aa7e84 | 2009-07-09 14:52:32 +0200 | [diff] [blame] | 478 | set_bdi_congested(&fc->bdi, BLK_RW_SYNC); |
| 479 | set_bdi_congested(&fc->bdi, BLK_RW_ASYNC); |
Miklos Szeredi | d12def1 | 2008-02-06 01:38:39 -0800 | [diff] [blame] | 480 | } |
| 481 | list_add_tail(&req->list, &fc->bg_queue); |
| 482 | flush_bg_queue(fc); |
| 483 | } |
| 484 | |
Tejun Heo | b93f858 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 485 | 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] | 486 | { |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 487 | spin_lock(&fc->lock); |
Miklos Szeredi | 1e9a4ed | 2005-09-09 13:10:31 -0700 | [diff] [blame] | 488 | if (fc->connected) { |
Tejun Heo | b93f858 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 489 | fuse_request_send_nowait_locked(fc, req); |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 490 | spin_unlock(&fc->lock); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 491 | } else { |
| 492 | req->out.h.error = -ENOTCONN; |
| 493 | request_end(fc, req); |
| 494 | } |
| 495 | } |
| 496 | |
Tejun Heo | b93f858 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 497 | 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] | 498 | { |
| 499 | req->isreply = 1; |
Tejun Heo | b93f858 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 500 | fuse_request_send_nowait(fc, req); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 501 | } |
Tejun Heo | 08cbf54 | 2009-04-14 10:54:53 +0900 | [diff] [blame] | 502 | EXPORT_SYMBOL_GPL(fuse_request_send_background); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 503 | |
Miklos Szeredi | 2d45ba3 | 2010-07-12 14:41:40 +0200 | [diff] [blame] | 504 | static int fuse_request_send_notify_reply(struct fuse_conn *fc, |
| 505 | struct fuse_req *req, u64 unique) |
| 506 | { |
| 507 | int err = -ENODEV; |
| 508 | |
| 509 | req->isreply = 0; |
| 510 | req->in.h.unique = unique; |
| 511 | spin_lock(&fc->lock); |
| 512 | if (fc->connected) { |
| 513 | queue_request(fc, req); |
| 514 | err = 0; |
| 515 | } |
| 516 | spin_unlock(&fc->lock); |
| 517 | |
| 518 | return err; |
| 519 | } |
| 520 | |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 521 | /* |
Miklos Szeredi | 3be5a52 | 2008-04-30 00:54:41 -0700 | [diff] [blame] | 522 | * Called under fc->lock |
| 523 | * |
| 524 | * fc->connected must have been checked previously |
| 525 | */ |
Tejun Heo | b93f858 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 526 | void fuse_request_send_background_locked(struct fuse_conn *fc, |
| 527 | struct fuse_req *req) |
Miklos Szeredi | 3be5a52 | 2008-04-30 00:54:41 -0700 | [diff] [blame] | 528 | { |
| 529 | req->isreply = 1; |
Tejun Heo | b93f858 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 530 | fuse_request_send_nowait_locked(fc, req); |
Miklos Szeredi | 3be5a52 | 2008-04-30 00:54:41 -0700 | [diff] [blame] | 531 | } |
| 532 | |
Anand V. Avati | 0b05b18 | 2012-08-19 08:53:23 -0400 | [diff] [blame] | 533 | void fuse_force_forget(struct file *file, u64 nodeid) |
| 534 | { |
Al Viro | 6131ffa | 2013-02-27 16:59:05 -0500 | [diff] [blame] | 535 | struct inode *inode = file_inode(file); |
Anand V. Avati | 0b05b18 | 2012-08-19 08:53:23 -0400 | [diff] [blame] | 536 | struct fuse_conn *fc = get_fuse_conn(inode); |
| 537 | struct fuse_req *req; |
| 538 | struct fuse_forget_in inarg; |
| 539 | |
| 540 | memset(&inarg, 0, sizeof(inarg)); |
| 541 | inarg.nlookup = 1; |
Maxim Patlasov | b111c8c | 2012-10-26 19:48:30 +0400 | [diff] [blame] | 542 | req = fuse_get_req_nofail_nopages(fc, file); |
Anand V. Avati | 0b05b18 | 2012-08-19 08:53:23 -0400 | [diff] [blame] | 543 | req->in.h.opcode = FUSE_FORGET; |
| 544 | req->in.h.nodeid = nodeid; |
| 545 | req->in.numargs = 1; |
| 546 | req->in.args[0].size = sizeof(inarg); |
| 547 | req->in.args[0].value = &inarg; |
| 548 | req->isreply = 0; |
Eric Wong | 6a4e922 | 2013-02-04 13:04:44 +0000 | [diff] [blame] | 549 | __fuse_request_send(fc, req); |
| 550 | /* ignore errors */ |
| 551 | fuse_put_request(fc, req); |
Anand V. Avati | 0b05b18 | 2012-08-19 08:53:23 -0400 | [diff] [blame] | 552 | } |
| 553 | |
Miklos Szeredi | 3be5a52 | 2008-04-30 00:54:41 -0700 | [diff] [blame] | 554 | /* |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 555 | * Lock the request. Up to the next unlock_request() there mustn't be |
| 556 | * anything that could cause a page-fault. If the request was already |
Miklos Szeredi | f9a2842 | 2006-06-25 05:48:53 -0700 | [diff] [blame] | 557 | * aborted bail out. |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 558 | */ |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 559 | static int lock_request(struct fuse_conn *fc, struct fuse_req *req) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 560 | { |
| 561 | int err = 0; |
| 562 | if (req) { |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 563 | spin_lock(&fc->lock); |
Miklos Szeredi | f9a2842 | 2006-06-25 05:48:53 -0700 | [diff] [blame] | 564 | if (req->aborted) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 565 | err = -ENOENT; |
| 566 | else |
| 567 | req->locked = 1; |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 568 | spin_unlock(&fc->lock); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 569 | } |
| 570 | return err; |
| 571 | } |
| 572 | |
| 573 | /* |
Miklos Szeredi | f9a2842 | 2006-06-25 05:48:53 -0700 | [diff] [blame] | 574 | * Unlock request. If it was aborted during being locked, the |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 575 | * requester thread is currently waiting for it to be unlocked, so |
| 576 | * wake it up. |
| 577 | */ |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 578 | static void unlock_request(struct fuse_conn *fc, struct fuse_req *req) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 579 | { |
| 580 | if (req) { |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 581 | spin_lock(&fc->lock); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 582 | req->locked = 0; |
Miklos Szeredi | f9a2842 | 2006-06-25 05:48:53 -0700 | [diff] [blame] | 583 | if (req->aborted) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 584 | wake_up(&req->waitq); |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 585 | spin_unlock(&fc->lock); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 586 | } |
| 587 | } |
| 588 | |
| 589 | struct fuse_copy_state { |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 590 | struct fuse_conn *fc; |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 591 | int write; |
| 592 | struct fuse_req *req; |
| 593 | const struct iovec *iov; |
Miklos Szeredi | dd3bb14 | 2010-05-25 15:06:06 +0200 | [diff] [blame] | 594 | struct pipe_buffer *pipebufs; |
| 595 | struct pipe_buffer *currbuf; |
| 596 | struct pipe_inode_info *pipe; |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 597 | unsigned long nr_segs; |
| 598 | unsigned long seglen; |
| 599 | unsigned long addr; |
| 600 | struct page *pg; |
| 601 | void *mapaddr; |
| 602 | void *buf; |
| 603 | unsigned len; |
Miklos Szeredi | ce534fb | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 604 | unsigned move_pages:1; |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 605 | }; |
| 606 | |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 607 | 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] | 608 | int write, |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 609 | const struct iovec *iov, unsigned long nr_segs) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 610 | { |
| 611 | memset(cs, 0, sizeof(*cs)); |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 612 | cs->fc = fc; |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 613 | cs->write = write; |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 614 | cs->iov = iov; |
| 615 | cs->nr_segs = nr_segs; |
| 616 | } |
| 617 | |
| 618 | /* Unmap and put previous page of userspace buffer */ |
Miklos Szeredi | 8bfc016 | 2006-01-16 22:14:28 -0800 | [diff] [blame] | 619 | static void fuse_copy_finish(struct fuse_copy_state *cs) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 620 | { |
Miklos Szeredi | dd3bb14 | 2010-05-25 15:06:06 +0200 | [diff] [blame] | 621 | if (cs->currbuf) { |
| 622 | struct pipe_buffer *buf = cs->currbuf; |
| 623 | |
Miklos Szeredi | c302162 | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 624 | if (!cs->write) { |
| 625 | buf->ops->unmap(cs->pipe, buf, cs->mapaddr); |
| 626 | } else { |
Miklos Szeredi | 7909b1c | 2010-07-12 14:41:40 +0200 | [diff] [blame] | 627 | kunmap(buf->page); |
Miklos Szeredi | c302162 | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 628 | buf->len = PAGE_SIZE - cs->len; |
| 629 | } |
Miklos Szeredi | dd3bb14 | 2010-05-25 15:06:06 +0200 | [diff] [blame] | 630 | cs->currbuf = NULL; |
| 631 | cs->mapaddr = NULL; |
| 632 | } else if (cs->mapaddr) { |
Miklos Szeredi | 7909b1c | 2010-07-12 14:41:40 +0200 | [diff] [blame] | 633 | kunmap(cs->pg); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 634 | if (cs->write) { |
| 635 | flush_dcache_page(cs->pg); |
| 636 | set_page_dirty_lock(cs->pg); |
| 637 | } |
| 638 | put_page(cs->pg); |
| 639 | cs->mapaddr = NULL; |
| 640 | } |
| 641 | } |
| 642 | |
| 643 | /* |
| 644 | * Get another pagefull of userspace buffer, and map it to kernel |
| 645 | * address space, and lock request |
| 646 | */ |
| 647 | static int fuse_copy_fill(struct fuse_copy_state *cs) |
| 648 | { |
| 649 | unsigned long offset; |
| 650 | int err; |
| 651 | |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 652 | unlock_request(cs->fc, cs->req); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 653 | fuse_copy_finish(cs); |
Miklos Szeredi | dd3bb14 | 2010-05-25 15:06:06 +0200 | [diff] [blame] | 654 | if (cs->pipebufs) { |
| 655 | struct pipe_buffer *buf = cs->pipebufs; |
| 656 | |
Miklos Szeredi | c302162 | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 657 | if (!cs->write) { |
| 658 | err = buf->ops->confirm(cs->pipe, buf); |
| 659 | if (err) |
| 660 | return err; |
Miklos Szeredi | dd3bb14 | 2010-05-25 15:06:06 +0200 | [diff] [blame] | 661 | |
Miklos Szeredi | c302162 | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 662 | BUG_ON(!cs->nr_segs); |
| 663 | cs->currbuf = buf; |
Miklos Szeredi | 7909b1c | 2010-07-12 14:41:40 +0200 | [diff] [blame] | 664 | cs->mapaddr = buf->ops->map(cs->pipe, buf, 0); |
Miklos Szeredi | c302162 | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 665 | cs->len = buf->len; |
| 666 | cs->buf = cs->mapaddr + buf->offset; |
| 667 | cs->pipebufs++; |
| 668 | cs->nr_segs--; |
| 669 | } else { |
| 670 | struct page *page; |
| 671 | |
| 672 | if (cs->nr_segs == cs->pipe->buffers) |
| 673 | return -EIO; |
| 674 | |
| 675 | page = alloc_page(GFP_HIGHUSER); |
| 676 | if (!page) |
| 677 | return -ENOMEM; |
| 678 | |
| 679 | buf->page = page; |
| 680 | buf->offset = 0; |
| 681 | buf->len = 0; |
| 682 | |
| 683 | cs->currbuf = buf; |
Miklos Szeredi | 7909b1c | 2010-07-12 14:41:40 +0200 | [diff] [blame] | 684 | cs->mapaddr = kmap(page); |
Miklos Szeredi | c302162 | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 685 | cs->buf = cs->mapaddr; |
| 686 | cs->len = PAGE_SIZE; |
| 687 | cs->pipebufs++; |
| 688 | cs->nr_segs++; |
| 689 | } |
Miklos Szeredi | dd3bb14 | 2010-05-25 15:06:06 +0200 | [diff] [blame] | 690 | } else { |
| 691 | if (!cs->seglen) { |
| 692 | BUG_ON(!cs->nr_segs); |
| 693 | cs->seglen = cs->iov[0].iov_len; |
| 694 | cs->addr = (unsigned long) cs->iov[0].iov_base; |
| 695 | cs->iov++; |
| 696 | cs->nr_segs--; |
| 697 | } |
| 698 | err = get_user_pages_fast(cs->addr, 1, cs->write, &cs->pg); |
| 699 | if (err < 0) |
| 700 | return err; |
| 701 | BUG_ON(err != 1); |
| 702 | offset = cs->addr % PAGE_SIZE; |
Miklos Szeredi | 7909b1c | 2010-07-12 14:41:40 +0200 | [diff] [blame] | 703 | cs->mapaddr = kmap(cs->pg); |
Miklos Szeredi | dd3bb14 | 2010-05-25 15:06:06 +0200 | [diff] [blame] | 704 | cs->buf = cs->mapaddr + offset; |
| 705 | cs->len = min(PAGE_SIZE - offset, cs->seglen); |
| 706 | cs->seglen -= cs->len; |
| 707 | cs->addr += cs->len; |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 708 | } |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 709 | |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 710 | return lock_request(cs->fc, cs->req); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 711 | } |
| 712 | |
| 713 | /* Do as much copy to/from userspace buffer as we can */ |
Miklos Szeredi | 8bfc016 | 2006-01-16 22:14:28 -0800 | [diff] [blame] | 714 | 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] | 715 | { |
| 716 | unsigned ncpy = min(*size, cs->len); |
| 717 | if (val) { |
| 718 | if (cs->write) |
| 719 | memcpy(cs->buf, *val, ncpy); |
| 720 | else |
| 721 | memcpy(*val, cs->buf, ncpy); |
| 722 | *val += ncpy; |
| 723 | } |
| 724 | *size -= ncpy; |
| 725 | cs->len -= ncpy; |
| 726 | cs->buf += ncpy; |
| 727 | return ncpy; |
| 728 | } |
| 729 | |
Miklos Szeredi | ce534fb | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 730 | static int fuse_check_page(struct page *page) |
| 731 | { |
| 732 | if (page_mapcount(page) || |
| 733 | page->mapping != NULL || |
| 734 | page_count(page) != 1 || |
| 735 | (page->flags & PAGE_FLAGS_CHECK_AT_PREP & |
| 736 | ~(1 << PG_locked | |
| 737 | 1 << PG_referenced | |
| 738 | 1 << PG_uptodate | |
| 739 | 1 << PG_lru | |
| 740 | 1 << PG_active | |
| 741 | 1 << PG_reclaim))) { |
| 742 | printk(KERN_WARNING "fuse: trying to steal weird page\n"); |
| 743 | 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); |
| 744 | return 1; |
| 745 | } |
| 746 | return 0; |
| 747 | } |
| 748 | |
| 749 | static int fuse_try_move_page(struct fuse_copy_state *cs, struct page **pagep) |
| 750 | { |
| 751 | int err; |
| 752 | struct page *oldpage = *pagep; |
| 753 | struct page *newpage; |
| 754 | struct pipe_buffer *buf = cs->pipebufs; |
Miklos Szeredi | ce534fb | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 755 | |
| 756 | unlock_request(cs->fc, cs->req); |
| 757 | fuse_copy_finish(cs); |
| 758 | |
| 759 | err = buf->ops->confirm(cs->pipe, buf); |
| 760 | if (err) |
| 761 | return err; |
| 762 | |
| 763 | BUG_ON(!cs->nr_segs); |
| 764 | cs->currbuf = buf; |
| 765 | cs->len = buf->len; |
| 766 | cs->pipebufs++; |
| 767 | cs->nr_segs--; |
| 768 | |
| 769 | if (cs->len != PAGE_SIZE) |
| 770 | goto out_fallback; |
| 771 | |
| 772 | if (buf->ops->steal(cs->pipe, buf) != 0) |
| 773 | goto out_fallback; |
| 774 | |
| 775 | newpage = buf->page; |
| 776 | |
| 777 | if (WARN_ON(!PageUptodate(newpage))) |
| 778 | return -EIO; |
| 779 | |
| 780 | ClearPageMappedToDisk(newpage); |
| 781 | |
| 782 | if (fuse_check_page(newpage) != 0) |
| 783 | goto out_fallback_unlock; |
| 784 | |
Miklos Szeredi | ce534fb | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 785 | /* |
| 786 | * This is a new and locked page, it shouldn't be mapped or |
| 787 | * have any special flags on it |
| 788 | */ |
| 789 | if (WARN_ON(page_mapped(oldpage))) |
| 790 | goto out_fallback_unlock; |
| 791 | if (WARN_ON(page_has_private(oldpage))) |
| 792 | goto out_fallback_unlock; |
| 793 | if (WARN_ON(PageDirty(oldpage) || PageWriteback(oldpage))) |
| 794 | goto out_fallback_unlock; |
| 795 | if (WARN_ON(PageMlocked(oldpage))) |
| 796 | goto out_fallback_unlock; |
| 797 | |
Miklos Szeredi | ef6a3c6 | 2011-03-22 16:30:52 -0700 | [diff] [blame] | 798 | err = replace_page_cache_page(oldpage, newpage, GFP_KERNEL); |
Miklos Szeredi | ce534fb | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 799 | if (err) { |
Miklos Szeredi | ef6a3c6 | 2011-03-22 16:30:52 -0700 | [diff] [blame] | 800 | unlock_page(newpage); |
| 801 | return err; |
Miklos Szeredi | ce534fb | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 802 | } |
Miklos Szeredi | ef6a3c6 | 2011-03-22 16:30:52 -0700 | [diff] [blame] | 803 | |
Miklos Szeredi | ce534fb | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 804 | page_cache_get(newpage); |
| 805 | |
| 806 | if (!(buf->flags & PIPE_BUF_FLAG_LRU)) |
| 807 | lru_cache_add_file(newpage); |
| 808 | |
| 809 | err = 0; |
| 810 | spin_lock(&cs->fc->lock); |
| 811 | if (cs->req->aborted) |
| 812 | err = -ENOENT; |
| 813 | else |
| 814 | *pagep = newpage; |
| 815 | spin_unlock(&cs->fc->lock); |
| 816 | |
| 817 | if (err) { |
| 818 | unlock_page(newpage); |
| 819 | page_cache_release(newpage); |
| 820 | return err; |
| 821 | } |
| 822 | |
| 823 | unlock_page(oldpage); |
| 824 | page_cache_release(oldpage); |
| 825 | cs->len = 0; |
| 826 | |
| 827 | return 0; |
| 828 | |
| 829 | out_fallback_unlock: |
| 830 | unlock_page(newpage); |
| 831 | out_fallback: |
| 832 | cs->mapaddr = buf->ops->map(cs->pipe, buf, 1); |
| 833 | cs->buf = cs->mapaddr + buf->offset; |
| 834 | |
| 835 | err = lock_request(cs->fc, cs->req); |
| 836 | if (err) |
| 837 | return err; |
| 838 | |
| 839 | return 1; |
| 840 | } |
| 841 | |
Miklos Szeredi | c302162 | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 842 | static int fuse_ref_page(struct fuse_copy_state *cs, struct page *page, |
| 843 | unsigned offset, unsigned count) |
| 844 | { |
| 845 | struct pipe_buffer *buf; |
| 846 | |
| 847 | if (cs->nr_segs == cs->pipe->buffers) |
| 848 | return -EIO; |
| 849 | |
| 850 | unlock_request(cs->fc, cs->req); |
| 851 | fuse_copy_finish(cs); |
| 852 | |
| 853 | buf = cs->pipebufs; |
| 854 | page_cache_get(page); |
| 855 | buf->page = page; |
| 856 | buf->offset = offset; |
| 857 | buf->len = count; |
| 858 | |
| 859 | cs->pipebufs++; |
| 860 | cs->nr_segs++; |
| 861 | cs->len = 0; |
| 862 | |
| 863 | return 0; |
| 864 | } |
| 865 | |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 866 | /* |
| 867 | * Copy a page in the request to/from the userspace buffer. Must be |
| 868 | * done atomically |
| 869 | */ |
Miklos Szeredi | ce534fb | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 870 | 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] | 871 | unsigned offset, unsigned count, int zeroing) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 872 | { |
Miklos Szeredi | ce534fb | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 873 | int err; |
| 874 | struct page *page = *pagep; |
| 875 | |
Miklos Szeredi | b6777c4 | 2010-10-26 14:22:27 -0700 | [diff] [blame] | 876 | if (page && zeroing && count < PAGE_SIZE) |
| 877 | clear_highpage(page); |
| 878 | |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 879 | while (count) { |
Miklos Szeredi | c302162 | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 880 | if (cs->write && cs->pipebufs && page) { |
| 881 | return fuse_ref_page(cs, page, offset, count); |
| 882 | } else if (!cs->len) { |
Miklos Szeredi | ce534fb | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 883 | if (cs->move_pages && page && |
| 884 | offset == 0 && count == PAGE_SIZE) { |
| 885 | err = fuse_try_move_page(cs, pagep); |
| 886 | if (err <= 0) |
| 887 | return err; |
| 888 | } else { |
| 889 | err = fuse_copy_fill(cs); |
| 890 | if (err) |
| 891 | return err; |
| 892 | } |
Miklos Szeredi | 1729a16 | 2008-11-26 12:03:54 +0100 | [diff] [blame] | 893 | } |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 894 | if (page) { |
Cong Wang | 2408f6e | 2011-11-25 23:14:30 +0800 | [diff] [blame] | 895 | void *mapaddr = kmap_atomic(page); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 896 | void *buf = mapaddr + offset; |
| 897 | offset += fuse_copy_do(cs, &buf, &count); |
Cong Wang | 2408f6e | 2011-11-25 23:14:30 +0800 | [diff] [blame] | 898 | kunmap_atomic(mapaddr); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 899 | } else |
| 900 | offset += fuse_copy_do(cs, NULL, &count); |
| 901 | } |
| 902 | if (page && !cs->write) |
| 903 | flush_dcache_page(page); |
| 904 | return 0; |
| 905 | } |
| 906 | |
| 907 | /* Copy pages in the request to/from userspace buffer */ |
| 908 | static int fuse_copy_pages(struct fuse_copy_state *cs, unsigned nbytes, |
| 909 | int zeroing) |
| 910 | { |
| 911 | unsigned i; |
| 912 | struct fuse_req *req = cs->req; |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 913 | |
| 914 | for (i = 0; i < req->num_pages && (nbytes || zeroing); i++) { |
Miklos Szeredi | ce534fb | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 915 | int err; |
Maxim Patlasov | 85f40ae | 2012-10-26 19:49:33 +0400 | [diff] [blame] | 916 | unsigned offset = req->page_descs[i].offset; |
| 917 | unsigned count = min(nbytes, req->page_descs[i].length); |
Miklos Szeredi | ce534fb | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 918 | |
| 919 | err = fuse_copy_page(cs, &req->pages[i], offset, count, |
| 920 | zeroing); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 921 | if (err) |
| 922 | return err; |
| 923 | |
| 924 | nbytes -= count; |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 925 | } |
| 926 | return 0; |
| 927 | } |
| 928 | |
| 929 | /* Copy a single argument in the request to/from userspace buffer */ |
| 930 | static int fuse_copy_one(struct fuse_copy_state *cs, void *val, unsigned size) |
| 931 | { |
| 932 | while (size) { |
Miklos Szeredi | 1729a16 | 2008-11-26 12:03:54 +0100 | [diff] [blame] | 933 | if (!cs->len) { |
| 934 | int err = fuse_copy_fill(cs); |
| 935 | if (err) |
| 936 | return err; |
| 937 | } |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 938 | fuse_copy_do(cs, &val, &size); |
| 939 | } |
| 940 | return 0; |
| 941 | } |
| 942 | |
| 943 | /* Copy request arguments to/from userspace buffer */ |
| 944 | static int fuse_copy_args(struct fuse_copy_state *cs, unsigned numargs, |
| 945 | unsigned argpages, struct fuse_arg *args, |
| 946 | int zeroing) |
| 947 | { |
| 948 | int err = 0; |
| 949 | unsigned i; |
| 950 | |
| 951 | for (i = 0; !err && i < numargs; i++) { |
| 952 | struct fuse_arg *arg = &args[i]; |
| 953 | if (i == numargs - 1 && argpages) |
| 954 | err = fuse_copy_pages(cs, arg->size, zeroing); |
| 955 | else |
| 956 | err = fuse_copy_one(cs, arg->value, arg->size); |
| 957 | } |
| 958 | return err; |
| 959 | } |
| 960 | |
Miklos Szeredi | 07e77dc | 2010-12-07 20:16:56 +0100 | [diff] [blame] | 961 | static int forget_pending(struct fuse_conn *fc) |
| 962 | { |
| 963 | return fc->forget_list_head.next != NULL; |
| 964 | } |
| 965 | |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 966 | static int request_pending(struct fuse_conn *fc) |
| 967 | { |
Miklos Szeredi | 07e77dc | 2010-12-07 20:16:56 +0100 | [diff] [blame] | 968 | return !list_empty(&fc->pending) || !list_empty(&fc->interrupts) || |
| 969 | forget_pending(fc); |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 970 | } |
| 971 | |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 972 | /* Wait until a request is available on the pending list */ |
| 973 | static void request_wait(struct fuse_conn *fc) |
Miklos Szeredi | b9ca67b | 2010-09-07 13:42:41 +0200 | [diff] [blame] | 974 | __releases(fc->lock) |
| 975 | __acquires(fc->lock) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 976 | { |
| 977 | DECLARE_WAITQUEUE(wait, current); |
| 978 | |
| 979 | add_wait_queue_exclusive(&fc->waitq, &wait); |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 980 | while (fc->connected && !request_pending(fc)) { |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 981 | set_current_state(TASK_INTERRUPTIBLE); |
| 982 | if (signal_pending(current)) |
| 983 | break; |
| 984 | |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 985 | spin_unlock(&fc->lock); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 986 | schedule(); |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 987 | spin_lock(&fc->lock); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 988 | } |
| 989 | set_current_state(TASK_RUNNING); |
| 990 | remove_wait_queue(&fc->waitq, &wait); |
| 991 | } |
| 992 | |
| 993 | /* |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 994 | * Transfer an interrupt request to userspace |
| 995 | * |
| 996 | * Unlike other requests this is assembled on demand, without a need |
| 997 | * to allocate a separate fuse_req structure. |
| 998 | * |
| 999 | * Called with fc->lock held, releases it |
| 1000 | */ |
Miklos Szeredi | c302162 | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 1001 | static int fuse_read_interrupt(struct fuse_conn *fc, struct fuse_copy_state *cs, |
| 1002 | size_t nbytes, struct fuse_req *req) |
Miklos Szeredi | b9ca67b | 2010-09-07 13:42:41 +0200 | [diff] [blame] | 1003 | __releases(fc->lock) |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 1004 | { |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 1005 | struct fuse_in_header ih; |
| 1006 | struct fuse_interrupt_in arg; |
| 1007 | unsigned reqsize = sizeof(ih) + sizeof(arg); |
| 1008 | int err; |
| 1009 | |
| 1010 | list_del_init(&req->intr_entry); |
| 1011 | req->intr_unique = fuse_get_unique(fc); |
| 1012 | memset(&ih, 0, sizeof(ih)); |
| 1013 | memset(&arg, 0, sizeof(arg)); |
| 1014 | ih.len = reqsize; |
| 1015 | ih.opcode = FUSE_INTERRUPT; |
| 1016 | ih.unique = req->intr_unique; |
| 1017 | arg.unique = req->in.h.unique; |
| 1018 | |
| 1019 | spin_unlock(&fc->lock); |
Miklos Szeredi | c302162 | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 1020 | if (nbytes < reqsize) |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 1021 | return -EINVAL; |
| 1022 | |
Miklos Szeredi | c302162 | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 1023 | err = fuse_copy_one(cs, &ih, sizeof(ih)); |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 1024 | if (!err) |
Miklos Szeredi | c302162 | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 1025 | err = fuse_copy_one(cs, &arg, sizeof(arg)); |
| 1026 | fuse_copy_finish(cs); |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 1027 | |
| 1028 | return err ? err : reqsize; |
| 1029 | } |
| 1030 | |
Miklos Szeredi | 02c048b | 2010-12-07 20:16:56 +0100 | [diff] [blame] | 1031 | static struct fuse_forget_link *dequeue_forget(struct fuse_conn *fc, |
| 1032 | unsigned max, |
| 1033 | unsigned *countp) |
Miklos Szeredi | 07e77dc | 2010-12-07 20:16:56 +0100 | [diff] [blame] | 1034 | { |
Miklos Szeredi | 02c048b | 2010-12-07 20:16:56 +0100 | [diff] [blame] | 1035 | struct fuse_forget_link *head = fc->forget_list_head.next; |
| 1036 | struct fuse_forget_link **newhead = &head; |
| 1037 | unsigned count; |
Miklos Szeredi | 07e77dc | 2010-12-07 20:16:56 +0100 | [diff] [blame] | 1038 | |
Miklos Szeredi | 02c048b | 2010-12-07 20:16:56 +0100 | [diff] [blame] | 1039 | for (count = 0; *newhead != NULL && count < max; count++) |
| 1040 | newhead = &(*newhead)->next; |
| 1041 | |
| 1042 | fc->forget_list_head.next = *newhead; |
| 1043 | *newhead = NULL; |
Miklos Szeredi | 07e77dc | 2010-12-07 20:16:56 +0100 | [diff] [blame] | 1044 | if (fc->forget_list_head.next == NULL) |
| 1045 | fc->forget_list_tail = &fc->forget_list_head; |
| 1046 | |
Miklos Szeredi | 02c048b | 2010-12-07 20:16:56 +0100 | [diff] [blame] | 1047 | if (countp != NULL) |
| 1048 | *countp = count; |
| 1049 | |
| 1050 | return head; |
Miklos Szeredi | 07e77dc | 2010-12-07 20:16:56 +0100 | [diff] [blame] | 1051 | } |
| 1052 | |
| 1053 | static int fuse_read_single_forget(struct fuse_conn *fc, |
| 1054 | struct fuse_copy_state *cs, |
| 1055 | size_t nbytes) |
| 1056 | __releases(fc->lock) |
| 1057 | { |
| 1058 | int err; |
Miklos Szeredi | 02c048b | 2010-12-07 20:16:56 +0100 | [diff] [blame] | 1059 | struct fuse_forget_link *forget = dequeue_forget(fc, 1, NULL); |
Miklos Szeredi | 07e77dc | 2010-12-07 20:16:56 +0100 | [diff] [blame] | 1060 | struct fuse_forget_in arg = { |
Miklos Szeredi | 02c048b | 2010-12-07 20:16:56 +0100 | [diff] [blame] | 1061 | .nlookup = forget->forget_one.nlookup, |
Miklos Szeredi | 07e77dc | 2010-12-07 20:16:56 +0100 | [diff] [blame] | 1062 | }; |
| 1063 | struct fuse_in_header ih = { |
| 1064 | .opcode = FUSE_FORGET, |
Miklos Szeredi | 02c048b | 2010-12-07 20:16:56 +0100 | [diff] [blame] | 1065 | .nodeid = forget->forget_one.nodeid, |
Miklos Szeredi | 07e77dc | 2010-12-07 20:16:56 +0100 | [diff] [blame] | 1066 | .unique = fuse_get_unique(fc), |
| 1067 | .len = sizeof(ih) + sizeof(arg), |
| 1068 | }; |
| 1069 | |
| 1070 | spin_unlock(&fc->lock); |
| 1071 | kfree(forget); |
| 1072 | if (nbytes < ih.len) |
| 1073 | return -EINVAL; |
| 1074 | |
| 1075 | err = fuse_copy_one(cs, &ih, sizeof(ih)); |
| 1076 | if (!err) |
| 1077 | err = fuse_copy_one(cs, &arg, sizeof(arg)); |
| 1078 | fuse_copy_finish(cs); |
| 1079 | |
| 1080 | if (err) |
| 1081 | return err; |
| 1082 | |
| 1083 | return ih.len; |
| 1084 | } |
| 1085 | |
Miklos Szeredi | 02c048b | 2010-12-07 20:16:56 +0100 | [diff] [blame] | 1086 | static int fuse_read_batch_forget(struct fuse_conn *fc, |
| 1087 | struct fuse_copy_state *cs, size_t nbytes) |
| 1088 | __releases(fc->lock) |
| 1089 | { |
| 1090 | int err; |
| 1091 | unsigned max_forgets; |
| 1092 | unsigned count; |
| 1093 | struct fuse_forget_link *head; |
| 1094 | struct fuse_batch_forget_in arg = { .count = 0 }; |
| 1095 | struct fuse_in_header ih = { |
| 1096 | .opcode = FUSE_BATCH_FORGET, |
| 1097 | .unique = fuse_get_unique(fc), |
| 1098 | .len = sizeof(ih) + sizeof(arg), |
| 1099 | }; |
| 1100 | |
| 1101 | if (nbytes < ih.len) { |
| 1102 | spin_unlock(&fc->lock); |
| 1103 | return -EINVAL; |
| 1104 | } |
| 1105 | |
| 1106 | max_forgets = (nbytes - ih.len) / sizeof(struct fuse_forget_one); |
| 1107 | head = dequeue_forget(fc, max_forgets, &count); |
| 1108 | spin_unlock(&fc->lock); |
| 1109 | |
| 1110 | arg.count = count; |
| 1111 | ih.len += count * sizeof(struct fuse_forget_one); |
| 1112 | err = fuse_copy_one(cs, &ih, sizeof(ih)); |
| 1113 | if (!err) |
| 1114 | err = fuse_copy_one(cs, &arg, sizeof(arg)); |
| 1115 | |
| 1116 | while (head) { |
| 1117 | struct fuse_forget_link *forget = head; |
| 1118 | |
| 1119 | if (!err) { |
| 1120 | err = fuse_copy_one(cs, &forget->forget_one, |
| 1121 | sizeof(forget->forget_one)); |
| 1122 | } |
| 1123 | head = forget->next; |
| 1124 | kfree(forget); |
| 1125 | } |
| 1126 | |
| 1127 | fuse_copy_finish(cs); |
| 1128 | |
| 1129 | if (err) |
| 1130 | return err; |
| 1131 | |
| 1132 | return ih.len; |
| 1133 | } |
| 1134 | |
| 1135 | static int fuse_read_forget(struct fuse_conn *fc, struct fuse_copy_state *cs, |
| 1136 | size_t nbytes) |
| 1137 | __releases(fc->lock) |
| 1138 | { |
| 1139 | if (fc->minor < 16 || fc->forget_list_head.next->next == NULL) |
| 1140 | return fuse_read_single_forget(fc, cs, nbytes); |
| 1141 | else |
| 1142 | return fuse_read_batch_forget(fc, cs, nbytes); |
| 1143 | } |
| 1144 | |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 1145 | /* |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1146 | * Read a single request into the userspace filesystem's buffer. This |
| 1147 | * function waits until a request is available, then removes it from |
| 1148 | * the pending list and copies request data to userspace buffer. If |
Miklos Szeredi | f9a2842 | 2006-06-25 05:48:53 -0700 | [diff] [blame] | 1149 | * no reply is needed (FORGET) or request has been aborted or there |
| 1150 | * was an error during the copying then it's finished by calling |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1151 | * request_end(). Otherwise add it to the processing list, and set |
| 1152 | * the 'sent' flag. |
| 1153 | */ |
Miklos Szeredi | c302162 | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 1154 | static ssize_t fuse_dev_do_read(struct fuse_conn *fc, struct file *file, |
| 1155 | struct fuse_copy_state *cs, size_t nbytes) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1156 | { |
| 1157 | int err; |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1158 | struct fuse_req *req; |
| 1159 | struct fuse_in *in; |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1160 | unsigned reqsize; |
| 1161 | |
Miklos Szeredi | 1d3d752 | 2006-01-06 00:19:40 -0800 | [diff] [blame] | 1162 | restart: |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 1163 | spin_lock(&fc->lock); |
Jeff Dike | e5ac1d1 | 2006-04-10 22:54:53 -0700 | [diff] [blame] | 1164 | err = -EAGAIN; |
| 1165 | if ((file->f_flags & O_NONBLOCK) && fc->connected && |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 1166 | !request_pending(fc)) |
Jeff Dike | e5ac1d1 | 2006-04-10 22:54:53 -0700 | [diff] [blame] | 1167 | goto err_unlock; |
| 1168 | |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1169 | request_wait(fc); |
| 1170 | err = -ENODEV; |
Miklos Szeredi | 9ba7cbb | 2006-01-16 22:14:34 -0800 | [diff] [blame] | 1171 | if (!fc->connected) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1172 | goto err_unlock; |
| 1173 | err = -ERESTARTSYS; |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 1174 | if (!request_pending(fc)) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1175 | goto err_unlock; |
| 1176 | |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 1177 | if (!list_empty(&fc->interrupts)) { |
| 1178 | req = list_entry(fc->interrupts.next, struct fuse_req, |
| 1179 | intr_entry); |
Miklos Szeredi | c302162 | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 1180 | return fuse_read_interrupt(fc, cs, nbytes, req); |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 1181 | } |
| 1182 | |
Miklos Szeredi | 07e77dc | 2010-12-07 20:16:56 +0100 | [diff] [blame] | 1183 | if (forget_pending(fc)) { |
| 1184 | if (list_empty(&fc->pending) || fc->forget_batch-- > 0) |
Miklos Szeredi | 02c048b | 2010-12-07 20:16:56 +0100 | [diff] [blame] | 1185 | return fuse_read_forget(fc, cs, nbytes); |
Miklos Szeredi | 07e77dc | 2010-12-07 20:16:56 +0100 | [diff] [blame] | 1186 | |
| 1187 | if (fc->forget_batch <= -8) |
| 1188 | fc->forget_batch = 16; |
| 1189 | } |
| 1190 | |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1191 | req = list_entry(fc->pending.next, struct fuse_req, list); |
Miklos Szeredi | 83cfd49 | 2006-01-16 22:14:31 -0800 | [diff] [blame] | 1192 | req->state = FUSE_REQ_READING; |
Miklos Szeredi | d77a1d5 | 2006-01-16 22:14:31 -0800 | [diff] [blame] | 1193 | list_move(&req->list, &fc->io); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1194 | |
| 1195 | in = &req->in; |
Miklos Szeredi | 1d3d752 | 2006-01-06 00:19:40 -0800 | [diff] [blame] | 1196 | reqsize = in->h.len; |
| 1197 | /* 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] | 1198 | if (nbytes < reqsize) { |
Miklos Szeredi | 1d3d752 | 2006-01-06 00:19:40 -0800 | [diff] [blame] | 1199 | req->out.h.error = -EIO; |
| 1200 | /* SETXATTR is special, since it may contain too large data */ |
| 1201 | if (in->h.opcode == FUSE_SETXATTR) |
| 1202 | req->out.h.error = -E2BIG; |
| 1203 | request_end(fc, req); |
| 1204 | goto restart; |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1205 | } |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 1206 | spin_unlock(&fc->lock); |
Miklos Szeredi | c302162 | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 1207 | cs->req = req; |
| 1208 | err = fuse_copy_one(cs, &in->h, sizeof(in->h)); |
Miklos Szeredi | 1d3d752 | 2006-01-06 00:19:40 -0800 | [diff] [blame] | 1209 | if (!err) |
Miklos Szeredi | c302162 | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 1210 | err = fuse_copy_args(cs, in->numargs, in->argpages, |
Miklos Szeredi | 1d3d752 | 2006-01-06 00:19:40 -0800 | [diff] [blame] | 1211 | (struct fuse_arg *) in->args, 0); |
Miklos Szeredi | c302162 | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 1212 | fuse_copy_finish(cs); |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 1213 | spin_lock(&fc->lock); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1214 | req->locked = 0; |
Miklos Szeredi | c9c9d7d | 2007-10-16 23:31:05 -0700 | [diff] [blame] | 1215 | if (req->aborted) { |
| 1216 | request_end(fc, req); |
| 1217 | return -ENODEV; |
| 1218 | } |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1219 | if (err) { |
Miklos Szeredi | c9c9d7d | 2007-10-16 23:31:05 -0700 | [diff] [blame] | 1220 | req->out.h.error = -EIO; |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1221 | request_end(fc, req); |
| 1222 | return err; |
| 1223 | } |
| 1224 | if (!req->isreply) |
| 1225 | request_end(fc, req); |
| 1226 | else { |
Miklos Szeredi | 83cfd49 | 2006-01-16 22:14:31 -0800 | [diff] [blame] | 1227 | req->state = FUSE_REQ_SENT; |
Miklos Szeredi | d77a1d5 | 2006-01-16 22:14:31 -0800 | [diff] [blame] | 1228 | list_move_tail(&req->list, &fc->processing); |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 1229 | if (req->interrupted) |
| 1230 | queue_interrupt(fc, req); |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 1231 | spin_unlock(&fc->lock); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1232 | } |
| 1233 | return reqsize; |
| 1234 | |
| 1235 | err_unlock: |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 1236 | spin_unlock(&fc->lock); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1237 | return err; |
| 1238 | } |
| 1239 | |
Miklos Szeredi | c302162 | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 1240 | static ssize_t fuse_dev_read(struct kiocb *iocb, const struct iovec *iov, |
| 1241 | unsigned long nr_segs, loff_t pos) |
| 1242 | { |
| 1243 | struct fuse_copy_state cs; |
| 1244 | struct file *file = iocb->ki_filp; |
| 1245 | struct fuse_conn *fc = fuse_get_conn(file); |
| 1246 | if (!fc) |
| 1247 | return -EPERM; |
| 1248 | |
| 1249 | fuse_copy_init(&cs, fc, 1, iov, nr_segs); |
| 1250 | |
| 1251 | return fuse_dev_do_read(fc, file, &cs, iov_length(iov, nr_segs)); |
| 1252 | } |
| 1253 | |
| 1254 | static int fuse_dev_pipe_buf_steal(struct pipe_inode_info *pipe, |
| 1255 | struct pipe_buffer *buf) |
| 1256 | { |
| 1257 | return 1; |
| 1258 | } |
| 1259 | |
| 1260 | static const struct pipe_buf_operations fuse_dev_pipe_buf_ops = { |
| 1261 | .can_merge = 0, |
| 1262 | .map = generic_pipe_buf_map, |
| 1263 | .unmap = generic_pipe_buf_unmap, |
| 1264 | .confirm = generic_pipe_buf_confirm, |
| 1265 | .release = generic_pipe_buf_release, |
| 1266 | .steal = fuse_dev_pipe_buf_steal, |
| 1267 | .get = generic_pipe_buf_get, |
| 1268 | }; |
| 1269 | |
| 1270 | static ssize_t fuse_dev_splice_read(struct file *in, loff_t *ppos, |
| 1271 | struct pipe_inode_info *pipe, |
| 1272 | size_t len, unsigned int flags) |
| 1273 | { |
| 1274 | int ret; |
| 1275 | int page_nr = 0; |
| 1276 | int do_wakeup = 0; |
| 1277 | struct pipe_buffer *bufs; |
| 1278 | struct fuse_copy_state cs; |
| 1279 | struct fuse_conn *fc = fuse_get_conn(in); |
| 1280 | if (!fc) |
| 1281 | return -EPERM; |
| 1282 | |
Miklos Szeredi | 07e77dc | 2010-12-07 20:16:56 +0100 | [diff] [blame] | 1283 | bufs = kmalloc(pipe->buffers * sizeof(struct pipe_buffer), GFP_KERNEL); |
Miklos Szeredi | c302162 | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 1284 | if (!bufs) |
| 1285 | return -ENOMEM; |
| 1286 | |
| 1287 | fuse_copy_init(&cs, fc, 1, NULL, 0); |
| 1288 | cs.pipebufs = bufs; |
| 1289 | cs.pipe = pipe; |
| 1290 | ret = fuse_dev_do_read(fc, in, &cs, len); |
| 1291 | if (ret < 0) |
| 1292 | goto out; |
| 1293 | |
| 1294 | ret = 0; |
| 1295 | pipe_lock(pipe); |
| 1296 | |
| 1297 | if (!pipe->readers) { |
| 1298 | send_sig(SIGPIPE, current, 0); |
| 1299 | if (!ret) |
| 1300 | ret = -EPIPE; |
| 1301 | goto out_unlock; |
| 1302 | } |
| 1303 | |
| 1304 | if (pipe->nrbufs + cs.nr_segs > pipe->buffers) { |
| 1305 | ret = -EIO; |
| 1306 | goto out_unlock; |
| 1307 | } |
| 1308 | |
| 1309 | while (page_nr < cs.nr_segs) { |
| 1310 | int newbuf = (pipe->curbuf + pipe->nrbufs) & (pipe->buffers - 1); |
| 1311 | struct pipe_buffer *buf = pipe->bufs + newbuf; |
| 1312 | |
| 1313 | buf->page = bufs[page_nr].page; |
| 1314 | buf->offset = bufs[page_nr].offset; |
| 1315 | buf->len = bufs[page_nr].len; |
| 1316 | buf->ops = &fuse_dev_pipe_buf_ops; |
| 1317 | |
| 1318 | pipe->nrbufs++; |
| 1319 | page_nr++; |
| 1320 | ret += buf->len; |
| 1321 | |
Al Viro | 6447a3c | 2013-03-21 11:01:38 -0400 | [diff] [blame^] | 1322 | if (pipe->files) |
Miklos Szeredi | c302162 | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 1323 | do_wakeup = 1; |
| 1324 | } |
| 1325 | |
| 1326 | out_unlock: |
| 1327 | pipe_unlock(pipe); |
| 1328 | |
| 1329 | if (do_wakeup) { |
| 1330 | smp_mb(); |
| 1331 | if (waitqueue_active(&pipe->wait)) |
| 1332 | wake_up_interruptible(&pipe->wait); |
| 1333 | kill_fasync(&pipe->fasync_readers, SIGIO, POLL_IN); |
| 1334 | } |
| 1335 | |
| 1336 | out: |
| 1337 | for (; page_nr < cs.nr_segs; page_nr++) |
| 1338 | page_cache_release(bufs[page_nr].page); |
| 1339 | |
| 1340 | kfree(bufs); |
| 1341 | return ret; |
| 1342 | } |
| 1343 | |
Tejun Heo | 95668a6 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 1344 | static int fuse_notify_poll(struct fuse_conn *fc, unsigned int size, |
| 1345 | struct fuse_copy_state *cs) |
| 1346 | { |
| 1347 | struct fuse_notify_poll_wakeup_out outarg; |
Miklos Szeredi | f6d47a1 | 2009-01-26 15:00:59 +0100 | [diff] [blame] | 1348 | int err = -EINVAL; |
Tejun Heo | 95668a6 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 1349 | |
| 1350 | if (size != sizeof(outarg)) |
Miklos Szeredi | f6d47a1 | 2009-01-26 15:00:59 +0100 | [diff] [blame] | 1351 | goto err; |
Tejun Heo | 95668a6 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 1352 | |
| 1353 | err = fuse_copy_one(cs, &outarg, sizeof(outarg)); |
| 1354 | if (err) |
Miklos Szeredi | f6d47a1 | 2009-01-26 15:00:59 +0100 | [diff] [blame] | 1355 | goto err; |
Tejun Heo | 95668a6 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 1356 | |
Miklos Szeredi | f6d47a1 | 2009-01-26 15:00:59 +0100 | [diff] [blame] | 1357 | fuse_copy_finish(cs); |
Tejun Heo | 95668a6 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 1358 | return fuse_notify_poll_wakeup(fc, &outarg); |
Miklos Szeredi | f6d47a1 | 2009-01-26 15:00:59 +0100 | [diff] [blame] | 1359 | |
| 1360 | err: |
| 1361 | fuse_copy_finish(cs); |
| 1362 | return err; |
Tejun Heo | 95668a6 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 1363 | } |
| 1364 | |
John Muir | 3b463ae | 2009-05-31 11:13:57 -0400 | [diff] [blame] | 1365 | static int fuse_notify_inval_inode(struct fuse_conn *fc, unsigned int size, |
| 1366 | struct fuse_copy_state *cs) |
| 1367 | { |
| 1368 | struct fuse_notify_inval_inode_out outarg; |
| 1369 | int err = -EINVAL; |
| 1370 | |
| 1371 | if (size != sizeof(outarg)) |
| 1372 | goto err; |
| 1373 | |
| 1374 | err = fuse_copy_one(cs, &outarg, sizeof(outarg)); |
| 1375 | if (err) |
| 1376 | goto err; |
| 1377 | fuse_copy_finish(cs); |
| 1378 | |
| 1379 | down_read(&fc->killsb); |
| 1380 | err = -ENOENT; |
Miklos Szeredi | b21dda4 | 2010-02-05 12:08:31 +0100 | [diff] [blame] | 1381 | if (fc->sb) { |
| 1382 | err = fuse_reverse_inval_inode(fc->sb, outarg.ino, |
| 1383 | outarg.off, outarg.len); |
| 1384 | } |
John Muir | 3b463ae | 2009-05-31 11:13:57 -0400 | [diff] [blame] | 1385 | up_read(&fc->killsb); |
| 1386 | return err; |
| 1387 | |
| 1388 | err: |
| 1389 | fuse_copy_finish(cs); |
| 1390 | return err; |
| 1391 | } |
| 1392 | |
| 1393 | static int fuse_notify_inval_entry(struct fuse_conn *fc, unsigned int size, |
| 1394 | struct fuse_copy_state *cs) |
| 1395 | { |
| 1396 | struct fuse_notify_inval_entry_out outarg; |
Fang Wenqi | b2d82ee | 2009-12-30 18:37:13 +0800 | [diff] [blame] | 1397 | int err = -ENOMEM; |
| 1398 | char *buf; |
John Muir | 3b463ae | 2009-05-31 11:13:57 -0400 | [diff] [blame] | 1399 | struct qstr name; |
| 1400 | |
Fang Wenqi | b2d82ee | 2009-12-30 18:37:13 +0800 | [diff] [blame] | 1401 | buf = kzalloc(FUSE_NAME_MAX + 1, GFP_KERNEL); |
| 1402 | if (!buf) |
| 1403 | goto err; |
| 1404 | |
| 1405 | err = -EINVAL; |
John Muir | 3b463ae | 2009-05-31 11:13:57 -0400 | [diff] [blame] | 1406 | if (size < sizeof(outarg)) |
| 1407 | goto err; |
| 1408 | |
| 1409 | err = fuse_copy_one(cs, &outarg, sizeof(outarg)); |
| 1410 | if (err) |
| 1411 | goto err; |
| 1412 | |
| 1413 | err = -ENAMETOOLONG; |
| 1414 | if (outarg.namelen > FUSE_NAME_MAX) |
| 1415 | goto err; |
| 1416 | |
Miklos Szeredi | c2183d1 | 2011-08-24 10:20:17 +0200 | [diff] [blame] | 1417 | err = -EINVAL; |
| 1418 | if (size != sizeof(outarg) + outarg.namelen + 1) |
| 1419 | goto err; |
| 1420 | |
John Muir | 3b463ae | 2009-05-31 11:13:57 -0400 | [diff] [blame] | 1421 | name.name = buf; |
| 1422 | name.len = outarg.namelen; |
| 1423 | err = fuse_copy_one(cs, buf, outarg.namelen + 1); |
| 1424 | if (err) |
| 1425 | goto err; |
| 1426 | fuse_copy_finish(cs); |
| 1427 | buf[outarg.namelen] = 0; |
| 1428 | name.hash = full_name_hash(name.name, name.len); |
| 1429 | |
| 1430 | down_read(&fc->killsb); |
| 1431 | err = -ENOENT; |
Miklos Szeredi | b21dda4 | 2010-02-05 12:08:31 +0100 | [diff] [blame] | 1432 | if (fc->sb) |
John Muir | 451d0f5 | 2011-12-06 21:50:06 +0100 | [diff] [blame] | 1433 | err = fuse_reverse_inval_entry(fc->sb, outarg.parent, 0, &name); |
| 1434 | up_read(&fc->killsb); |
| 1435 | kfree(buf); |
| 1436 | return err; |
| 1437 | |
| 1438 | err: |
| 1439 | kfree(buf); |
| 1440 | fuse_copy_finish(cs); |
| 1441 | return err; |
| 1442 | } |
| 1443 | |
| 1444 | static int fuse_notify_delete(struct fuse_conn *fc, unsigned int size, |
| 1445 | struct fuse_copy_state *cs) |
| 1446 | { |
| 1447 | struct fuse_notify_delete_out outarg; |
| 1448 | int err = -ENOMEM; |
| 1449 | char *buf; |
| 1450 | struct qstr name; |
| 1451 | |
| 1452 | buf = kzalloc(FUSE_NAME_MAX + 1, GFP_KERNEL); |
| 1453 | if (!buf) |
| 1454 | goto err; |
| 1455 | |
| 1456 | err = -EINVAL; |
| 1457 | if (size < sizeof(outarg)) |
| 1458 | goto err; |
| 1459 | |
| 1460 | err = fuse_copy_one(cs, &outarg, sizeof(outarg)); |
| 1461 | if (err) |
| 1462 | goto err; |
| 1463 | |
| 1464 | err = -ENAMETOOLONG; |
| 1465 | if (outarg.namelen > FUSE_NAME_MAX) |
| 1466 | goto err; |
| 1467 | |
| 1468 | err = -EINVAL; |
| 1469 | if (size != sizeof(outarg) + outarg.namelen + 1) |
| 1470 | goto err; |
| 1471 | |
| 1472 | name.name = buf; |
| 1473 | name.len = outarg.namelen; |
| 1474 | err = fuse_copy_one(cs, buf, outarg.namelen + 1); |
| 1475 | if (err) |
| 1476 | goto err; |
| 1477 | fuse_copy_finish(cs); |
| 1478 | buf[outarg.namelen] = 0; |
| 1479 | name.hash = full_name_hash(name.name, name.len); |
| 1480 | |
| 1481 | down_read(&fc->killsb); |
| 1482 | err = -ENOENT; |
| 1483 | if (fc->sb) |
| 1484 | err = fuse_reverse_inval_entry(fc->sb, outarg.parent, |
| 1485 | outarg.child, &name); |
John Muir | 3b463ae | 2009-05-31 11:13:57 -0400 | [diff] [blame] | 1486 | up_read(&fc->killsb); |
Fang Wenqi | b2d82ee | 2009-12-30 18:37:13 +0800 | [diff] [blame] | 1487 | kfree(buf); |
John Muir | 3b463ae | 2009-05-31 11:13:57 -0400 | [diff] [blame] | 1488 | return err; |
| 1489 | |
| 1490 | err: |
Fang Wenqi | b2d82ee | 2009-12-30 18:37:13 +0800 | [diff] [blame] | 1491 | kfree(buf); |
John Muir | 3b463ae | 2009-05-31 11:13:57 -0400 | [diff] [blame] | 1492 | fuse_copy_finish(cs); |
| 1493 | return err; |
| 1494 | } |
| 1495 | |
Miklos Szeredi | a1d75f2 | 2010-07-12 14:41:40 +0200 | [diff] [blame] | 1496 | static int fuse_notify_store(struct fuse_conn *fc, unsigned int size, |
| 1497 | struct fuse_copy_state *cs) |
| 1498 | { |
| 1499 | struct fuse_notify_store_out outarg; |
| 1500 | struct inode *inode; |
| 1501 | struct address_space *mapping; |
| 1502 | u64 nodeid; |
| 1503 | int err; |
| 1504 | pgoff_t index; |
| 1505 | unsigned int offset; |
| 1506 | unsigned int num; |
| 1507 | loff_t file_size; |
| 1508 | loff_t end; |
| 1509 | |
| 1510 | err = -EINVAL; |
| 1511 | if (size < sizeof(outarg)) |
| 1512 | goto out_finish; |
| 1513 | |
| 1514 | err = fuse_copy_one(cs, &outarg, sizeof(outarg)); |
| 1515 | if (err) |
| 1516 | goto out_finish; |
| 1517 | |
| 1518 | err = -EINVAL; |
| 1519 | if (size - sizeof(outarg) != outarg.size) |
| 1520 | goto out_finish; |
| 1521 | |
| 1522 | nodeid = outarg.nodeid; |
| 1523 | |
| 1524 | down_read(&fc->killsb); |
| 1525 | |
| 1526 | err = -ENOENT; |
| 1527 | if (!fc->sb) |
| 1528 | goto out_up_killsb; |
| 1529 | |
| 1530 | inode = ilookup5(fc->sb, nodeid, fuse_inode_eq, &nodeid); |
| 1531 | if (!inode) |
| 1532 | goto out_up_killsb; |
| 1533 | |
| 1534 | mapping = inode->i_mapping; |
| 1535 | index = outarg.offset >> PAGE_CACHE_SHIFT; |
| 1536 | offset = outarg.offset & ~PAGE_CACHE_MASK; |
| 1537 | file_size = i_size_read(inode); |
| 1538 | end = outarg.offset + outarg.size; |
| 1539 | if (end > file_size) { |
| 1540 | file_size = end; |
| 1541 | fuse_write_update_size(inode, file_size); |
| 1542 | } |
| 1543 | |
| 1544 | num = outarg.size; |
| 1545 | while (num) { |
| 1546 | struct page *page; |
| 1547 | unsigned int this_num; |
| 1548 | |
| 1549 | err = -ENOMEM; |
| 1550 | page = find_or_create_page(mapping, index, |
| 1551 | mapping_gfp_mask(mapping)); |
| 1552 | if (!page) |
| 1553 | goto out_iput; |
| 1554 | |
| 1555 | this_num = min_t(unsigned, num, PAGE_CACHE_SIZE - offset); |
| 1556 | err = fuse_copy_page(cs, &page, offset, this_num, 0); |
| 1557 | if (!err && offset == 0 && (num != 0 || file_size == end)) |
| 1558 | SetPageUptodate(page); |
| 1559 | unlock_page(page); |
| 1560 | page_cache_release(page); |
| 1561 | |
| 1562 | if (err) |
| 1563 | goto out_iput; |
| 1564 | |
| 1565 | num -= this_num; |
| 1566 | offset = 0; |
| 1567 | index++; |
| 1568 | } |
| 1569 | |
| 1570 | err = 0; |
| 1571 | |
| 1572 | out_iput: |
| 1573 | iput(inode); |
| 1574 | out_up_killsb: |
| 1575 | up_read(&fc->killsb); |
| 1576 | out_finish: |
| 1577 | fuse_copy_finish(cs); |
| 1578 | return err; |
| 1579 | } |
| 1580 | |
Miklos Szeredi | 2d45ba3 | 2010-07-12 14:41:40 +0200 | [diff] [blame] | 1581 | static void fuse_retrieve_end(struct fuse_conn *fc, struct fuse_req *req) |
| 1582 | { |
Miklos Szeredi | 0be8557 | 2010-10-27 15:34:46 -0700 | [diff] [blame] | 1583 | release_pages(req->pages, req->num_pages, 0); |
Miklos Szeredi | 2d45ba3 | 2010-07-12 14:41:40 +0200 | [diff] [blame] | 1584 | } |
| 1585 | |
| 1586 | static int fuse_retrieve(struct fuse_conn *fc, struct inode *inode, |
| 1587 | struct fuse_notify_retrieve_out *outarg) |
| 1588 | { |
| 1589 | int err; |
| 1590 | struct address_space *mapping = inode->i_mapping; |
| 1591 | struct fuse_req *req; |
| 1592 | pgoff_t index; |
| 1593 | loff_t file_size; |
| 1594 | unsigned int num; |
| 1595 | unsigned int offset; |
Geert Uytterhoeven | 0157443 | 2010-09-30 22:06:21 +0200 | [diff] [blame] | 1596 | size_t total_len = 0; |
Maxim Patlasov | 4d53dc9 | 2012-10-26 19:48:42 +0400 | [diff] [blame] | 1597 | int num_pages; |
Miklos Szeredi | 2d45ba3 | 2010-07-12 14:41:40 +0200 | [diff] [blame] | 1598 | |
| 1599 | offset = outarg->offset & ~PAGE_CACHE_MASK; |
Maxim Patlasov | 4d53dc9 | 2012-10-26 19:48:42 +0400 | [diff] [blame] | 1600 | file_size = i_size_read(inode); |
| 1601 | |
| 1602 | num = outarg->size; |
| 1603 | if (outarg->offset > file_size) |
| 1604 | num = 0; |
| 1605 | else if (outarg->offset + num > file_size) |
| 1606 | num = file_size - outarg->offset; |
| 1607 | |
| 1608 | num_pages = (num + offset + PAGE_SIZE - 1) >> PAGE_SHIFT; |
| 1609 | num_pages = min(num_pages, FUSE_MAX_PAGES_PER_REQ); |
| 1610 | |
| 1611 | req = fuse_get_req(fc, num_pages); |
| 1612 | if (IS_ERR(req)) |
| 1613 | return PTR_ERR(req); |
Miklos Szeredi | 2d45ba3 | 2010-07-12 14:41:40 +0200 | [diff] [blame] | 1614 | |
| 1615 | req->in.h.opcode = FUSE_NOTIFY_REPLY; |
| 1616 | req->in.h.nodeid = outarg->nodeid; |
| 1617 | req->in.numargs = 2; |
| 1618 | req->in.argpages = 1; |
Maxim Patlasov | b2430d7 | 2012-10-26 19:49:24 +0400 | [diff] [blame] | 1619 | req->page_descs[0].offset = offset; |
Miklos Szeredi | 2d45ba3 | 2010-07-12 14:41:40 +0200 | [diff] [blame] | 1620 | req->end = fuse_retrieve_end; |
| 1621 | |
| 1622 | index = outarg->offset >> PAGE_CACHE_SHIFT; |
Miklos Szeredi | 2d45ba3 | 2010-07-12 14:41:40 +0200 | [diff] [blame] | 1623 | |
Maxim Patlasov | 4d53dc9 | 2012-10-26 19:48:42 +0400 | [diff] [blame] | 1624 | while (num && req->num_pages < num_pages) { |
Miklos Szeredi | 2d45ba3 | 2010-07-12 14:41:40 +0200 | [diff] [blame] | 1625 | struct page *page; |
| 1626 | unsigned int this_num; |
| 1627 | |
| 1628 | page = find_get_page(mapping, index); |
| 1629 | if (!page) |
| 1630 | break; |
| 1631 | |
| 1632 | this_num = min_t(unsigned, num, PAGE_CACHE_SIZE - offset); |
| 1633 | req->pages[req->num_pages] = page; |
Maxim Patlasov | 85f40ae | 2012-10-26 19:49:33 +0400 | [diff] [blame] | 1634 | req->page_descs[req->num_pages].length = this_num; |
Miklos Szeredi | 2d45ba3 | 2010-07-12 14:41:40 +0200 | [diff] [blame] | 1635 | req->num_pages++; |
| 1636 | |
Miklos Szeredi | c9e67d4 | 2012-09-04 18:45:54 +0200 | [diff] [blame] | 1637 | offset = 0; |
Miklos Szeredi | 2d45ba3 | 2010-07-12 14:41:40 +0200 | [diff] [blame] | 1638 | num -= this_num; |
| 1639 | total_len += this_num; |
Miklos Szeredi | 48706d0 | 2011-12-13 10:36:59 +0100 | [diff] [blame] | 1640 | index++; |
Miklos Szeredi | 2d45ba3 | 2010-07-12 14:41:40 +0200 | [diff] [blame] | 1641 | } |
| 1642 | req->misc.retrieve_in.offset = outarg->offset; |
| 1643 | req->misc.retrieve_in.size = total_len; |
| 1644 | req->in.args[0].size = sizeof(req->misc.retrieve_in); |
| 1645 | req->in.args[0].value = &req->misc.retrieve_in; |
| 1646 | req->in.args[1].size = total_len; |
| 1647 | |
| 1648 | err = fuse_request_send_notify_reply(fc, req, outarg->notify_unique); |
| 1649 | if (err) |
| 1650 | fuse_retrieve_end(fc, req); |
| 1651 | |
| 1652 | return err; |
| 1653 | } |
| 1654 | |
| 1655 | static int fuse_notify_retrieve(struct fuse_conn *fc, unsigned int size, |
| 1656 | struct fuse_copy_state *cs) |
| 1657 | { |
| 1658 | struct fuse_notify_retrieve_out outarg; |
| 1659 | struct inode *inode; |
| 1660 | int err; |
| 1661 | |
| 1662 | err = -EINVAL; |
| 1663 | if (size != sizeof(outarg)) |
| 1664 | goto copy_finish; |
| 1665 | |
| 1666 | err = fuse_copy_one(cs, &outarg, sizeof(outarg)); |
| 1667 | if (err) |
| 1668 | goto copy_finish; |
| 1669 | |
| 1670 | fuse_copy_finish(cs); |
| 1671 | |
| 1672 | down_read(&fc->killsb); |
| 1673 | err = -ENOENT; |
| 1674 | if (fc->sb) { |
| 1675 | u64 nodeid = outarg.nodeid; |
| 1676 | |
| 1677 | inode = ilookup5(fc->sb, nodeid, fuse_inode_eq, &nodeid); |
| 1678 | if (inode) { |
| 1679 | err = fuse_retrieve(fc, inode, &outarg); |
| 1680 | iput(inode); |
| 1681 | } |
| 1682 | } |
| 1683 | up_read(&fc->killsb); |
| 1684 | |
| 1685 | return err; |
| 1686 | |
| 1687 | copy_finish: |
| 1688 | fuse_copy_finish(cs); |
| 1689 | return err; |
| 1690 | } |
| 1691 | |
Tejun Heo | 8599396 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 1692 | static int fuse_notify(struct fuse_conn *fc, enum fuse_notify_code code, |
| 1693 | unsigned int size, struct fuse_copy_state *cs) |
| 1694 | { |
| 1695 | switch (code) { |
Tejun Heo | 95668a6 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 1696 | case FUSE_NOTIFY_POLL: |
| 1697 | return fuse_notify_poll(fc, size, cs); |
| 1698 | |
John Muir | 3b463ae | 2009-05-31 11:13:57 -0400 | [diff] [blame] | 1699 | case FUSE_NOTIFY_INVAL_INODE: |
| 1700 | return fuse_notify_inval_inode(fc, size, cs); |
| 1701 | |
| 1702 | case FUSE_NOTIFY_INVAL_ENTRY: |
| 1703 | return fuse_notify_inval_entry(fc, size, cs); |
| 1704 | |
Miklos Szeredi | a1d75f2 | 2010-07-12 14:41:40 +0200 | [diff] [blame] | 1705 | case FUSE_NOTIFY_STORE: |
| 1706 | return fuse_notify_store(fc, size, cs); |
| 1707 | |
Miklos Szeredi | 2d45ba3 | 2010-07-12 14:41:40 +0200 | [diff] [blame] | 1708 | case FUSE_NOTIFY_RETRIEVE: |
| 1709 | return fuse_notify_retrieve(fc, size, cs); |
| 1710 | |
John Muir | 451d0f5 | 2011-12-06 21:50:06 +0100 | [diff] [blame] | 1711 | case FUSE_NOTIFY_DELETE: |
| 1712 | return fuse_notify_delete(fc, size, cs); |
| 1713 | |
Tejun Heo | 8599396 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 1714 | default: |
Miklos Szeredi | f6d47a1 | 2009-01-26 15:00:59 +0100 | [diff] [blame] | 1715 | fuse_copy_finish(cs); |
Tejun Heo | 8599396 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 1716 | return -EINVAL; |
| 1717 | } |
| 1718 | } |
| 1719 | |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1720 | /* Look up request on processing list by unique ID */ |
| 1721 | static struct fuse_req *request_find(struct fuse_conn *fc, u64 unique) |
| 1722 | { |
| 1723 | struct list_head *entry; |
| 1724 | |
| 1725 | list_for_each(entry, &fc->processing) { |
| 1726 | struct fuse_req *req; |
| 1727 | req = list_entry(entry, struct fuse_req, list); |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 1728 | if (req->in.h.unique == unique || req->intr_unique == unique) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1729 | return req; |
| 1730 | } |
| 1731 | return NULL; |
| 1732 | } |
| 1733 | |
| 1734 | static int copy_out_args(struct fuse_copy_state *cs, struct fuse_out *out, |
| 1735 | unsigned nbytes) |
| 1736 | { |
| 1737 | unsigned reqsize = sizeof(struct fuse_out_header); |
| 1738 | |
| 1739 | if (out->h.error) |
| 1740 | return nbytes != reqsize ? -EINVAL : 0; |
| 1741 | |
| 1742 | reqsize += len_args(out->numargs, out->args); |
| 1743 | |
| 1744 | if (reqsize < nbytes || (reqsize > nbytes && !out->argvar)) |
| 1745 | return -EINVAL; |
| 1746 | else if (reqsize > nbytes) { |
| 1747 | struct fuse_arg *lastarg = &out->args[out->numargs-1]; |
| 1748 | unsigned diffsize = reqsize - nbytes; |
| 1749 | if (diffsize > lastarg->size) |
| 1750 | return -EINVAL; |
| 1751 | lastarg->size -= diffsize; |
| 1752 | } |
| 1753 | return fuse_copy_args(cs, out->numargs, out->argpages, out->args, |
| 1754 | out->page_zeroing); |
| 1755 | } |
| 1756 | |
| 1757 | /* |
| 1758 | * Write a single reply to a request. First the header is copied from |
| 1759 | * the write buffer. The request is then searched on the processing |
| 1760 | * list by the unique ID found in the header. If found, then remove |
| 1761 | * it from the list and copy the rest of the buffer to the request. |
| 1762 | * The request is finished by calling request_end() |
| 1763 | */ |
Miklos Szeredi | dd3bb14 | 2010-05-25 15:06:06 +0200 | [diff] [blame] | 1764 | static ssize_t fuse_dev_do_write(struct fuse_conn *fc, |
| 1765 | struct fuse_copy_state *cs, size_t nbytes) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1766 | { |
| 1767 | int err; |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1768 | struct fuse_req *req; |
| 1769 | struct fuse_out_header oh; |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1770 | |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1771 | if (nbytes < sizeof(struct fuse_out_header)) |
| 1772 | return -EINVAL; |
| 1773 | |
Miklos Szeredi | dd3bb14 | 2010-05-25 15:06:06 +0200 | [diff] [blame] | 1774 | err = fuse_copy_one(cs, &oh, sizeof(oh)); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1775 | if (err) |
| 1776 | goto err_finish; |
Tejun Heo | 8599396 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 1777 | |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1778 | err = -EINVAL; |
Tejun Heo | 8599396 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 1779 | if (oh.len != nbytes) |
| 1780 | goto err_finish; |
| 1781 | |
| 1782 | /* |
| 1783 | * Zero oh.unique indicates unsolicited notification message |
| 1784 | * and error contains notification code. |
| 1785 | */ |
| 1786 | if (!oh.unique) { |
Miklos Szeredi | dd3bb14 | 2010-05-25 15:06:06 +0200 | [diff] [blame] | 1787 | err = fuse_notify(fc, oh.error, nbytes - sizeof(oh), cs); |
Tejun Heo | 8599396 | 2008-11-26 12:03:55 +0100 | [diff] [blame] | 1788 | return err ? err : nbytes; |
| 1789 | } |
| 1790 | |
| 1791 | err = -EINVAL; |
| 1792 | if (oh.error <= -1000 || oh.error > 0) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1793 | goto err_finish; |
| 1794 | |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 1795 | spin_lock(&fc->lock); |
Miklos Szeredi | 69a53bf | 2006-01-16 22:14:41 -0800 | [diff] [blame] | 1796 | err = -ENOENT; |
| 1797 | if (!fc->connected) |
| 1798 | goto err_unlock; |
| 1799 | |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1800 | req = request_find(fc, oh.unique); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1801 | if (!req) |
| 1802 | goto err_unlock; |
| 1803 | |
Miklos Szeredi | f9a2842 | 2006-06-25 05:48:53 -0700 | [diff] [blame] | 1804 | if (req->aborted) { |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 1805 | spin_unlock(&fc->lock); |
Miklos Szeredi | dd3bb14 | 2010-05-25 15:06:06 +0200 | [diff] [blame] | 1806 | fuse_copy_finish(cs); |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 1807 | spin_lock(&fc->lock); |
Miklos Szeredi | 222f1d6 | 2006-01-16 22:14:25 -0800 | [diff] [blame] | 1808 | request_end(fc, req); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1809 | return -ENOENT; |
| 1810 | } |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 1811 | /* Is it an interrupt reply? */ |
| 1812 | if (req->intr_unique == oh.unique) { |
| 1813 | err = -EINVAL; |
| 1814 | if (nbytes != sizeof(struct fuse_out_header)) |
| 1815 | goto err_unlock; |
| 1816 | |
| 1817 | if (oh.error == -ENOSYS) |
| 1818 | fc->no_interrupt = 1; |
| 1819 | else if (oh.error == -EAGAIN) |
| 1820 | queue_interrupt(fc, req); |
| 1821 | |
| 1822 | spin_unlock(&fc->lock); |
Miklos Szeredi | dd3bb14 | 2010-05-25 15:06:06 +0200 | [diff] [blame] | 1823 | fuse_copy_finish(cs); |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 1824 | return nbytes; |
| 1825 | } |
| 1826 | |
| 1827 | req->state = FUSE_REQ_WRITING; |
Miklos Szeredi | d77a1d5 | 2006-01-16 22:14:31 -0800 | [diff] [blame] | 1828 | list_move(&req->list, &fc->io); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1829 | req->out.h = oh; |
| 1830 | req->locked = 1; |
Miklos Szeredi | dd3bb14 | 2010-05-25 15:06:06 +0200 | [diff] [blame] | 1831 | cs->req = req; |
Miklos Szeredi | ce534fb | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 1832 | if (!req->out.page_replace) |
| 1833 | cs->move_pages = 0; |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 1834 | spin_unlock(&fc->lock); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1835 | |
Miklos Szeredi | dd3bb14 | 2010-05-25 15:06:06 +0200 | [diff] [blame] | 1836 | err = copy_out_args(cs, &req->out, nbytes); |
| 1837 | fuse_copy_finish(cs); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1838 | |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 1839 | spin_lock(&fc->lock); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1840 | req->locked = 0; |
| 1841 | if (!err) { |
Miklos Szeredi | f9a2842 | 2006-06-25 05:48:53 -0700 | [diff] [blame] | 1842 | if (req->aborted) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1843 | err = -ENOENT; |
Miklos Szeredi | f9a2842 | 2006-06-25 05:48:53 -0700 | [diff] [blame] | 1844 | } else if (!req->aborted) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1845 | req->out.h.error = -EIO; |
| 1846 | request_end(fc, req); |
| 1847 | |
| 1848 | return err ? err : nbytes; |
| 1849 | |
| 1850 | err_unlock: |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 1851 | spin_unlock(&fc->lock); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1852 | err_finish: |
Miklos Szeredi | dd3bb14 | 2010-05-25 15:06:06 +0200 | [diff] [blame] | 1853 | fuse_copy_finish(cs); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1854 | return err; |
| 1855 | } |
| 1856 | |
Miklos Szeredi | dd3bb14 | 2010-05-25 15:06:06 +0200 | [diff] [blame] | 1857 | static ssize_t fuse_dev_write(struct kiocb *iocb, const struct iovec *iov, |
| 1858 | unsigned long nr_segs, loff_t pos) |
| 1859 | { |
| 1860 | struct fuse_copy_state cs; |
| 1861 | struct fuse_conn *fc = fuse_get_conn(iocb->ki_filp); |
| 1862 | if (!fc) |
| 1863 | return -EPERM; |
| 1864 | |
Miklos Szeredi | c302162 | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 1865 | fuse_copy_init(&cs, fc, 0, iov, nr_segs); |
Miklos Szeredi | dd3bb14 | 2010-05-25 15:06:06 +0200 | [diff] [blame] | 1866 | |
| 1867 | return fuse_dev_do_write(fc, &cs, iov_length(iov, nr_segs)); |
| 1868 | } |
| 1869 | |
| 1870 | static ssize_t fuse_dev_splice_write(struct pipe_inode_info *pipe, |
| 1871 | struct file *out, loff_t *ppos, |
| 1872 | size_t len, unsigned int flags) |
| 1873 | { |
| 1874 | unsigned nbuf; |
| 1875 | unsigned idx; |
| 1876 | struct pipe_buffer *bufs; |
| 1877 | struct fuse_copy_state cs; |
| 1878 | struct fuse_conn *fc; |
| 1879 | size_t rem; |
| 1880 | ssize_t ret; |
| 1881 | |
| 1882 | fc = fuse_get_conn(out); |
| 1883 | if (!fc) |
| 1884 | return -EPERM; |
| 1885 | |
Miklos Szeredi | 07e77dc | 2010-12-07 20:16:56 +0100 | [diff] [blame] | 1886 | bufs = kmalloc(pipe->buffers * sizeof(struct pipe_buffer), GFP_KERNEL); |
Miklos Szeredi | dd3bb14 | 2010-05-25 15:06:06 +0200 | [diff] [blame] | 1887 | if (!bufs) |
| 1888 | return -ENOMEM; |
| 1889 | |
| 1890 | pipe_lock(pipe); |
| 1891 | nbuf = 0; |
| 1892 | rem = 0; |
| 1893 | for (idx = 0; idx < pipe->nrbufs && rem < len; idx++) |
| 1894 | rem += pipe->bufs[(pipe->curbuf + idx) & (pipe->buffers - 1)].len; |
| 1895 | |
| 1896 | ret = -EINVAL; |
| 1897 | if (rem < len) { |
| 1898 | pipe_unlock(pipe); |
| 1899 | goto out; |
| 1900 | } |
| 1901 | |
| 1902 | rem = len; |
| 1903 | while (rem) { |
| 1904 | struct pipe_buffer *ibuf; |
| 1905 | struct pipe_buffer *obuf; |
| 1906 | |
| 1907 | BUG_ON(nbuf >= pipe->buffers); |
| 1908 | BUG_ON(!pipe->nrbufs); |
| 1909 | ibuf = &pipe->bufs[pipe->curbuf]; |
| 1910 | obuf = &bufs[nbuf]; |
| 1911 | |
| 1912 | if (rem >= ibuf->len) { |
| 1913 | *obuf = *ibuf; |
| 1914 | ibuf->ops = NULL; |
| 1915 | pipe->curbuf = (pipe->curbuf + 1) & (pipe->buffers - 1); |
| 1916 | pipe->nrbufs--; |
| 1917 | } else { |
| 1918 | ibuf->ops->get(pipe, ibuf); |
| 1919 | *obuf = *ibuf; |
| 1920 | obuf->flags &= ~PIPE_BUF_FLAG_GIFT; |
| 1921 | obuf->len = rem; |
| 1922 | ibuf->offset += obuf->len; |
| 1923 | ibuf->len -= obuf->len; |
| 1924 | } |
| 1925 | nbuf++; |
| 1926 | rem -= obuf->len; |
| 1927 | } |
| 1928 | pipe_unlock(pipe); |
| 1929 | |
Miklos Szeredi | c302162 | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 1930 | fuse_copy_init(&cs, fc, 0, NULL, nbuf); |
Miklos Szeredi | dd3bb14 | 2010-05-25 15:06:06 +0200 | [diff] [blame] | 1931 | cs.pipebufs = bufs; |
Miklos Szeredi | dd3bb14 | 2010-05-25 15:06:06 +0200 | [diff] [blame] | 1932 | cs.pipe = pipe; |
| 1933 | |
Miklos Szeredi | ce534fb | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 1934 | if (flags & SPLICE_F_MOVE) |
| 1935 | cs.move_pages = 1; |
| 1936 | |
Miklos Szeredi | dd3bb14 | 2010-05-25 15:06:06 +0200 | [diff] [blame] | 1937 | ret = fuse_dev_do_write(fc, &cs, len); |
| 1938 | |
| 1939 | for (idx = 0; idx < nbuf; idx++) { |
| 1940 | struct pipe_buffer *buf = &bufs[idx]; |
| 1941 | buf->ops->release(pipe, buf); |
| 1942 | } |
| 1943 | out: |
| 1944 | kfree(bufs); |
| 1945 | return ret; |
| 1946 | } |
| 1947 | |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1948 | static unsigned fuse_dev_poll(struct file *file, poll_table *wait) |
| 1949 | { |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1950 | unsigned mask = POLLOUT | POLLWRNORM; |
Miklos Szeredi | 7025d9a | 2006-04-10 22:54:50 -0700 | [diff] [blame] | 1951 | struct fuse_conn *fc = fuse_get_conn(file); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1952 | if (!fc) |
Miklos Szeredi | 7025d9a | 2006-04-10 22:54:50 -0700 | [diff] [blame] | 1953 | return POLLERR; |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1954 | |
| 1955 | poll_wait(file, &fc->waitq, wait); |
| 1956 | |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 1957 | spin_lock(&fc->lock); |
Miklos Szeredi | 7025d9a | 2006-04-10 22:54:50 -0700 | [diff] [blame] | 1958 | if (!fc->connected) |
| 1959 | mask = POLLERR; |
Miklos Szeredi | a4d27e7 | 2006-06-25 05:48:54 -0700 | [diff] [blame] | 1960 | else if (request_pending(fc)) |
Miklos Szeredi | 7025d9a | 2006-04-10 22:54:50 -0700 | [diff] [blame] | 1961 | mask |= POLLIN | POLLRDNORM; |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 1962 | spin_unlock(&fc->lock); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1963 | |
| 1964 | return mask; |
| 1965 | } |
| 1966 | |
Miklos Szeredi | 69a53bf | 2006-01-16 22:14:41 -0800 | [diff] [blame] | 1967 | /* |
| 1968 | * Abort all requests on the given list (pending or processing) |
| 1969 | * |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 1970 | * This function releases and reacquires fc->lock |
Miklos Szeredi | 69a53bf | 2006-01-16 22:14:41 -0800 | [diff] [blame] | 1971 | */ |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1972 | static void end_requests(struct fuse_conn *fc, struct list_head *head) |
Miklos Szeredi | b9ca67b | 2010-09-07 13:42:41 +0200 | [diff] [blame] | 1973 | __releases(fc->lock) |
| 1974 | __acquires(fc->lock) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1975 | { |
| 1976 | while (!list_empty(head)) { |
| 1977 | struct fuse_req *req; |
| 1978 | req = list_entry(head->next, struct fuse_req, list); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1979 | req->out.h.error = -ECONNABORTED; |
| 1980 | request_end(fc, req); |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 1981 | spin_lock(&fc->lock); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 1982 | } |
| 1983 | } |
| 1984 | |
Miklos Szeredi | 69a53bf | 2006-01-16 22:14:41 -0800 | [diff] [blame] | 1985 | /* |
| 1986 | * Abort requests under I/O |
| 1987 | * |
Miklos Szeredi | f9a2842 | 2006-06-25 05:48:53 -0700 | [diff] [blame] | 1988 | * The requests are set to aborted and finished, and the request |
Miklos Szeredi | 69a53bf | 2006-01-16 22:14:41 -0800 | [diff] [blame] | 1989 | * waiter is woken up. This will make request_wait_answer() wait |
| 1990 | * until the request is unlocked and then return. |
Miklos Szeredi | 64c6d8e | 2006-01-16 22:14:42 -0800 | [diff] [blame] | 1991 | * |
| 1992 | * If the request is asynchronous, then the end function needs to be |
| 1993 | * called after waiting for the request to be unlocked (if it was |
| 1994 | * locked). |
Miklos Szeredi | 69a53bf | 2006-01-16 22:14:41 -0800 | [diff] [blame] | 1995 | */ |
| 1996 | static void end_io_requests(struct fuse_conn *fc) |
Miklos Szeredi | b9ca67b | 2010-09-07 13:42:41 +0200 | [diff] [blame] | 1997 | __releases(fc->lock) |
| 1998 | __acquires(fc->lock) |
Miklos Szeredi | 69a53bf | 2006-01-16 22:14:41 -0800 | [diff] [blame] | 1999 | { |
| 2000 | while (!list_empty(&fc->io)) { |
Miklos Szeredi | 64c6d8e | 2006-01-16 22:14:42 -0800 | [diff] [blame] | 2001 | struct fuse_req *req = |
| 2002 | list_entry(fc->io.next, struct fuse_req, list); |
| 2003 | void (*end) (struct fuse_conn *, struct fuse_req *) = req->end; |
| 2004 | |
Miklos Szeredi | f9a2842 | 2006-06-25 05:48:53 -0700 | [diff] [blame] | 2005 | req->aborted = 1; |
Miklos Szeredi | 69a53bf | 2006-01-16 22:14:41 -0800 | [diff] [blame] | 2006 | req->out.h.error = -ECONNABORTED; |
| 2007 | req->state = FUSE_REQ_FINISHED; |
| 2008 | list_del_init(&req->list); |
| 2009 | wake_up(&req->waitq); |
Miklos Szeredi | 64c6d8e | 2006-01-16 22:14:42 -0800 | [diff] [blame] | 2010 | if (end) { |
| 2011 | req->end = NULL; |
Miklos Szeredi | 64c6d8e | 2006-01-16 22:14:42 -0800 | [diff] [blame] | 2012 | __fuse_get_request(req); |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 2013 | spin_unlock(&fc->lock); |
Miklos Szeredi | 64c6d8e | 2006-01-16 22:14:42 -0800 | [diff] [blame] | 2014 | wait_event(req->waitq, !req->locked); |
| 2015 | end(fc, req); |
Tejun Heo | e9bb09d | 2008-11-26 12:03:54 +0100 | [diff] [blame] | 2016 | fuse_put_request(fc, req); |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 2017 | spin_lock(&fc->lock); |
Miklos Szeredi | 64c6d8e | 2006-01-16 22:14:42 -0800 | [diff] [blame] | 2018 | } |
Miklos Szeredi | 69a53bf | 2006-01-16 22:14:41 -0800 | [diff] [blame] | 2019 | } |
| 2020 | } |
| 2021 | |
Miklos Szeredi | 595afaf | 2010-09-07 13:42:41 +0200 | [diff] [blame] | 2022 | static void end_queued_requests(struct fuse_conn *fc) |
Miklos Szeredi | b9ca67b | 2010-09-07 13:42:41 +0200 | [diff] [blame] | 2023 | __releases(fc->lock) |
| 2024 | __acquires(fc->lock) |
Miklos Szeredi | 595afaf | 2010-09-07 13:42:41 +0200 | [diff] [blame] | 2025 | { |
| 2026 | fc->max_background = UINT_MAX; |
| 2027 | flush_bg_queue(fc); |
| 2028 | end_requests(fc, &fc->pending); |
| 2029 | end_requests(fc, &fc->processing); |
Miklos Szeredi | 07e77dc | 2010-12-07 20:16:56 +0100 | [diff] [blame] | 2030 | while (forget_pending(fc)) |
Miklos Szeredi | 02c048b | 2010-12-07 20:16:56 +0100 | [diff] [blame] | 2031 | kfree(dequeue_forget(fc, 1, NULL)); |
Miklos Szeredi | 595afaf | 2010-09-07 13:42:41 +0200 | [diff] [blame] | 2032 | } |
| 2033 | |
Bryan Green | 357ccf2 | 2011-03-01 16:43:52 -0800 | [diff] [blame] | 2034 | static void end_polls(struct fuse_conn *fc) |
| 2035 | { |
| 2036 | struct rb_node *p; |
| 2037 | |
| 2038 | p = rb_first(&fc->polled_files); |
| 2039 | |
| 2040 | while (p) { |
| 2041 | struct fuse_file *ff; |
| 2042 | ff = rb_entry(p, struct fuse_file, polled_node); |
| 2043 | wake_up_interruptible_all(&ff->poll_wait); |
| 2044 | |
| 2045 | p = rb_next(p); |
| 2046 | } |
| 2047 | } |
| 2048 | |
Miklos Szeredi | 69a53bf | 2006-01-16 22:14:41 -0800 | [diff] [blame] | 2049 | /* |
| 2050 | * Abort all requests. |
| 2051 | * |
| 2052 | * Emergency exit in case of a malicious or accidental deadlock, or |
| 2053 | * just a hung filesystem. |
| 2054 | * |
| 2055 | * The same effect is usually achievable through killing the |
| 2056 | * filesystem daemon and all users of the filesystem. The exception |
| 2057 | * is the combination of an asynchronous request and the tricky |
| 2058 | * deadlock (see Documentation/filesystems/fuse.txt). |
| 2059 | * |
| 2060 | * During the aborting, progression of requests from the pending and |
| 2061 | * processing lists onto the io list, and progression of new requests |
| 2062 | * onto the pending list is prevented by req->connected being false. |
| 2063 | * |
| 2064 | * Progression of requests under I/O to the processing list is |
Miklos Szeredi | f9a2842 | 2006-06-25 05:48:53 -0700 | [diff] [blame] | 2065 | * prevented by the req->aborted flag being true for these requests. |
| 2066 | * For this reason requests on the io list must be aborted first. |
Miklos Szeredi | 69a53bf | 2006-01-16 22:14:41 -0800 | [diff] [blame] | 2067 | */ |
| 2068 | void fuse_abort_conn(struct fuse_conn *fc) |
| 2069 | { |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 2070 | spin_lock(&fc->lock); |
Miklos Szeredi | 69a53bf | 2006-01-16 22:14:41 -0800 | [diff] [blame] | 2071 | if (fc->connected) { |
| 2072 | fc->connected = 0; |
Miklos Szeredi | 51eb01e | 2006-06-25 05:48:50 -0700 | [diff] [blame] | 2073 | fc->blocked = 0; |
Miklos Szeredi | 69a53bf | 2006-01-16 22:14:41 -0800 | [diff] [blame] | 2074 | end_io_requests(fc); |
Miklos Szeredi | 595afaf | 2010-09-07 13:42:41 +0200 | [diff] [blame] | 2075 | end_queued_requests(fc); |
Bryan Green | 357ccf2 | 2011-03-01 16:43:52 -0800 | [diff] [blame] | 2076 | end_polls(fc); |
Miklos Szeredi | 69a53bf | 2006-01-16 22:14:41 -0800 | [diff] [blame] | 2077 | wake_up_all(&fc->waitq); |
Miklos Szeredi | 51eb01e | 2006-06-25 05:48:50 -0700 | [diff] [blame] | 2078 | wake_up_all(&fc->blocked_waitq); |
Jeff Dike | 385a17b | 2006-04-10 22:54:52 -0700 | [diff] [blame] | 2079 | kill_fasync(&fc->fasync, SIGIO, POLL_IN); |
Miklos Szeredi | 69a53bf | 2006-01-16 22:14:41 -0800 | [diff] [blame] | 2080 | } |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 2081 | spin_unlock(&fc->lock); |
Miklos Szeredi | 69a53bf | 2006-01-16 22:14:41 -0800 | [diff] [blame] | 2082 | } |
Tejun Heo | 08cbf54 | 2009-04-14 10:54:53 +0900 | [diff] [blame] | 2083 | EXPORT_SYMBOL_GPL(fuse_abort_conn); |
Miklos Szeredi | 69a53bf | 2006-01-16 22:14:41 -0800 | [diff] [blame] | 2084 | |
Tejun Heo | 08cbf54 | 2009-04-14 10:54:53 +0900 | [diff] [blame] | 2085 | int fuse_dev_release(struct inode *inode, struct file *file) |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 2086 | { |
Miklos Szeredi | 0720b31 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 2087 | struct fuse_conn *fc = fuse_get_conn(file); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 2088 | if (fc) { |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 2089 | spin_lock(&fc->lock); |
Miklos Szeredi | 1e9a4ed | 2005-09-09 13:10:31 -0700 | [diff] [blame] | 2090 | fc->connected = 0; |
Miklos Szeredi | 595afaf | 2010-09-07 13:42:41 +0200 | [diff] [blame] | 2091 | fc->blocked = 0; |
| 2092 | end_queued_requests(fc); |
Bryan Green | 357ccf2 | 2011-03-01 16:43:52 -0800 | [diff] [blame] | 2093 | end_polls(fc); |
Miklos Szeredi | 595afaf | 2010-09-07 13:42:41 +0200 | [diff] [blame] | 2094 | wake_up_all(&fc->blocked_waitq); |
Miklos Szeredi | d713311 | 2006-04-10 22:54:55 -0700 | [diff] [blame] | 2095 | spin_unlock(&fc->lock); |
Miklos Szeredi | bafa965 | 2006-06-25 05:48:51 -0700 | [diff] [blame] | 2096 | fuse_conn_put(fc); |
Jeff Dike | 385a17b | 2006-04-10 22:54:52 -0700 | [diff] [blame] | 2097 | } |
Miklos Szeredi | f543f25 | 2006-01-16 22:14:35 -0800 | [diff] [blame] | 2098 | |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 2099 | return 0; |
| 2100 | } |
Tejun Heo | 08cbf54 | 2009-04-14 10:54:53 +0900 | [diff] [blame] | 2101 | EXPORT_SYMBOL_GPL(fuse_dev_release); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 2102 | |
Jeff Dike | 385a17b | 2006-04-10 22:54:52 -0700 | [diff] [blame] | 2103 | static int fuse_dev_fasync(int fd, struct file *file, int on) |
| 2104 | { |
| 2105 | struct fuse_conn *fc = fuse_get_conn(file); |
| 2106 | if (!fc) |
Miklos Szeredi | a87046d | 2006-04-10 22:54:56 -0700 | [diff] [blame] | 2107 | return -EPERM; |
Jeff Dike | 385a17b | 2006-04-10 22:54:52 -0700 | [diff] [blame] | 2108 | |
| 2109 | /* No locking - fasync_helper does its own locking */ |
| 2110 | return fasync_helper(fd, file, on, &fc->fasync); |
| 2111 | } |
| 2112 | |
Arjan van de Ven | 4b6f5d2 | 2006-03-28 01:56:42 -0800 | [diff] [blame] | 2113 | const struct file_operations fuse_dev_operations = { |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 2114 | .owner = THIS_MODULE, |
| 2115 | .llseek = no_llseek, |
Badari Pulavarty | ee0b3e6 | 2006-09-30 23:28:47 -0700 | [diff] [blame] | 2116 | .read = do_sync_read, |
| 2117 | .aio_read = fuse_dev_read, |
Miklos Szeredi | c302162 | 2010-05-25 15:06:07 +0200 | [diff] [blame] | 2118 | .splice_read = fuse_dev_splice_read, |
Badari Pulavarty | ee0b3e6 | 2006-09-30 23:28:47 -0700 | [diff] [blame] | 2119 | .write = do_sync_write, |
| 2120 | .aio_write = fuse_dev_write, |
Miklos Szeredi | dd3bb14 | 2010-05-25 15:06:06 +0200 | [diff] [blame] | 2121 | .splice_write = fuse_dev_splice_write, |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 2122 | .poll = fuse_dev_poll, |
| 2123 | .release = fuse_dev_release, |
Jeff Dike | 385a17b | 2006-04-10 22:54:52 -0700 | [diff] [blame] | 2124 | .fasync = fuse_dev_fasync, |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 2125 | }; |
Tejun Heo | 08cbf54 | 2009-04-14 10:54:53 +0900 | [diff] [blame] | 2126 | EXPORT_SYMBOL_GPL(fuse_dev_operations); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 2127 | |
| 2128 | static struct miscdevice fuse_miscdevice = { |
| 2129 | .minor = FUSE_MINOR, |
| 2130 | .name = "fuse", |
| 2131 | .fops = &fuse_dev_operations, |
| 2132 | }; |
| 2133 | |
| 2134 | int __init fuse_dev_init(void) |
| 2135 | { |
| 2136 | int err = -ENOMEM; |
| 2137 | fuse_req_cachep = kmem_cache_create("fuse_request", |
| 2138 | sizeof(struct fuse_req), |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 2139 | 0, 0, NULL); |
Miklos Szeredi | 334f485 | 2005-09-09 13:10:27 -0700 | [diff] [blame] | 2140 | if (!fuse_req_cachep) |
| 2141 | goto out; |
| 2142 | |
| 2143 | err = misc_register(&fuse_miscdevice); |
| 2144 | if (err) |
| 2145 | goto out_cache_clean; |
| 2146 | |
| 2147 | return 0; |
| 2148 | |
| 2149 | out_cache_clean: |
| 2150 | kmem_cache_destroy(fuse_req_cachep); |
| 2151 | out: |
| 2152 | return err; |
| 2153 | } |
| 2154 | |
| 2155 | void fuse_dev_cleanup(void) |
| 2156 | { |
| 2157 | misc_deregister(&fuse_miscdevice); |
| 2158 | kmem_cache_destroy(fuse_req_cachep); |
| 2159 | } |