David Teigland | 869d81d | 2006-01-17 08:47:12 +0000 | [diff] [blame] | 1 | /* |
David Teigland | 2402211 | 2008-03-14 15:09:15 -0500 | [diff] [blame] | 2 | * Copyright (C) 2005-2008 Red Hat, Inc. All rights reserved. |
David Teigland | 869d81d | 2006-01-17 08:47:12 +0000 | [diff] [blame] | 3 | * |
| 4 | * This copyrighted material is made available to anyone wishing to use, |
| 5 | * modify, copy, or redistribute it subject to the terms and conditions |
Steven Whitehouse | e9fc2aa | 2006-09-01 11:05:15 -0400 | [diff] [blame] | 6 | * of the GNU General Public License version 2. |
David Teigland | 869d81d | 2006-01-17 08:47:12 +0000 | [diff] [blame] | 7 | */ |
| 8 | |
David Teigland | 2402211 | 2008-03-14 15:09:15 -0500 | [diff] [blame] | 9 | #include <linux/fs.h> |
David Teigland | 869d81d | 2006-01-17 08:47:12 +0000 | [diff] [blame] | 10 | #include <linux/miscdevice.h> |
Al Viro | bd01f84 | 2006-10-19 17:23:57 -0400 | [diff] [blame] | 11 | #include <linux/poll.h> |
David Teigland | 2402211 | 2008-03-14 15:09:15 -0500 | [diff] [blame] | 12 | #include <linux/dlm.h> |
| 13 | #include <linux/dlm_plock.h> |
David Teigland | 869d81d | 2006-01-17 08:47:12 +0000 | [diff] [blame] | 14 | |
David Teigland | 2402211 | 2008-03-14 15:09:15 -0500 | [diff] [blame] | 15 | #include "dlm_internal.h" |
| 16 | #include "lockspace.h" |
David Teigland | 869d81d | 2006-01-17 08:47:12 +0000 | [diff] [blame] | 17 | |
| 18 | static spinlock_t ops_lock; |
| 19 | static struct list_head send_list; |
| 20 | static struct list_head recv_list; |
| 21 | static wait_queue_head_t send_wq; |
| 22 | static wait_queue_head_t recv_wq; |
| 23 | |
| 24 | struct plock_op { |
| 25 | struct list_head list; |
| 26 | int done; |
David Teigland | 2402211 | 2008-03-14 15:09:15 -0500 | [diff] [blame] | 27 | struct dlm_plock_info info; |
David Teigland | 869d81d | 2006-01-17 08:47:12 +0000 | [diff] [blame] | 28 | }; |
| 29 | |
Marc Eshel | 586759f | 2006-11-14 16:37:25 -0500 | [diff] [blame] | 30 | struct plock_xop { |
| 31 | struct plock_op xop; |
| 32 | void *callback; |
| 33 | void *fl; |
| 34 | void *file; |
| 35 | struct file_lock flc; |
| 36 | }; |
| 37 | |
| 38 | |
David Teigland | 2402211 | 2008-03-14 15:09:15 -0500 | [diff] [blame] | 39 | static inline void set_version(struct dlm_plock_info *info) |
David Teigland | 869d81d | 2006-01-17 08:47:12 +0000 | [diff] [blame] | 40 | { |
David Teigland | 2402211 | 2008-03-14 15:09:15 -0500 | [diff] [blame] | 41 | info->version[0] = DLM_PLOCK_VERSION_MAJOR; |
| 42 | info->version[1] = DLM_PLOCK_VERSION_MINOR; |
| 43 | info->version[2] = DLM_PLOCK_VERSION_PATCH; |
David Teigland | 869d81d | 2006-01-17 08:47:12 +0000 | [diff] [blame] | 44 | } |
| 45 | |
David Teigland | 2402211 | 2008-03-14 15:09:15 -0500 | [diff] [blame] | 46 | static int check_version(struct dlm_plock_info *info) |
David Teigland | 869d81d | 2006-01-17 08:47:12 +0000 | [diff] [blame] | 47 | { |
David Teigland | 2402211 | 2008-03-14 15:09:15 -0500 | [diff] [blame] | 48 | if ((DLM_PLOCK_VERSION_MAJOR != info->version[0]) || |
| 49 | (DLM_PLOCK_VERSION_MINOR < info->version[1])) { |
| 50 | log_print("plock device version mismatch: " |
David Teigland | 869d81d | 2006-01-17 08:47:12 +0000 | [diff] [blame] | 51 | "kernel (%u.%u.%u), user (%u.%u.%u)", |
David Teigland | 2402211 | 2008-03-14 15:09:15 -0500 | [diff] [blame] | 52 | DLM_PLOCK_VERSION_MAJOR, |
| 53 | DLM_PLOCK_VERSION_MINOR, |
| 54 | DLM_PLOCK_VERSION_PATCH, |
David Teigland | 869d81d | 2006-01-17 08:47:12 +0000 | [diff] [blame] | 55 | info->version[0], |
| 56 | info->version[1], |
| 57 | info->version[2]); |
| 58 | return -EINVAL; |
| 59 | } |
| 60 | return 0; |
| 61 | } |
| 62 | |
| 63 | static void send_op(struct plock_op *op) |
| 64 | { |
| 65 | set_version(&op->info); |
| 66 | INIT_LIST_HEAD(&op->list); |
| 67 | spin_lock(&ops_lock); |
| 68 | list_add_tail(&op->list, &send_list); |
| 69 | spin_unlock(&ops_lock); |
| 70 | wake_up(&send_wq); |
| 71 | } |
| 72 | |
David Teigland | 2402211 | 2008-03-14 15:09:15 -0500 | [diff] [blame] | 73 | int dlm_posix_lock(dlm_lockspace_t *lockspace, u64 number, struct file *file, |
| 74 | int cmd, struct file_lock *fl) |
David Teigland | 869d81d | 2006-01-17 08:47:12 +0000 | [diff] [blame] | 75 | { |
David Teigland | 2402211 | 2008-03-14 15:09:15 -0500 | [diff] [blame] | 76 | struct dlm_ls *ls; |
David Teigland | 869d81d | 2006-01-17 08:47:12 +0000 | [diff] [blame] | 77 | struct plock_op *op; |
Marc Eshel | 586759f | 2006-11-14 16:37:25 -0500 | [diff] [blame] | 78 | struct plock_xop *xop; |
David Teigland | 869d81d | 2006-01-17 08:47:12 +0000 | [diff] [blame] | 79 | int rv; |
| 80 | |
David Teigland | 2402211 | 2008-03-14 15:09:15 -0500 | [diff] [blame] | 81 | ls = dlm_find_lockspace_local(lockspace); |
| 82 | if (!ls) |
| 83 | return -EINVAL; |
| 84 | |
Marc Eshel | 586759f | 2006-11-14 16:37:25 -0500 | [diff] [blame] | 85 | xop = kzalloc(sizeof(*xop), GFP_KERNEL); |
David Teigland | 2402211 | 2008-03-14 15:09:15 -0500 | [diff] [blame] | 86 | if (!xop) { |
| 87 | rv = -ENOMEM; |
| 88 | goto out; |
| 89 | } |
David Teigland | 869d81d | 2006-01-17 08:47:12 +0000 | [diff] [blame] | 90 | |
Marc Eshel | 586759f | 2006-11-14 16:37:25 -0500 | [diff] [blame] | 91 | op = &xop->xop; |
David Teigland | 2402211 | 2008-03-14 15:09:15 -0500 | [diff] [blame] | 92 | op->info.optype = DLM_PLOCK_OP_LOCK; |
David Teigland | 3a2a9c9 | 2006-04-25 15:45:51 -0400 | [diff] [blame] | 93 | op->info.pid = fl->fl_pid; |
David Teigland | 869d81d | 2006-01-17 08:47:12 +0000 | [diff] [blame] | 94 | op->info.ex = (fl->fl_type == F_WRLCK); |
| 95 | op->info.wait = IS_SETLKW(cmd); |
David Teigland | 2402211 | 2008-03-14 15:09:15 -0500 | [diff] [blame] | 96 | op->info.fsid = ls->ls_global_id; |
| 97 | op->info.number = number; |
David Teigland | 869d81d | 2006-01-17 08:47:12 +0000 | [diff] [blame] | 98 | op->info.start = fl->fl_start; |
| 99 | op->info.end = fl->fl_end; |
Marc Eshel | 586759f | 2006-11-14 16:37:25 -0500 | [diff] [blame] | 100 | if (fl->fl_lmops && fl->fl_lmops->fl_grant) { |
David Teigland | 2066b58 | 2007-12-06 09:35:25 -0600 | [diff] [blame] | 101 | /* fl_owner is lockd which doesn't distinguish |
| 102 | processes on the nfs client */ |
| 103 | op->info.owner = (__u64) fl->fl_pid; |
Marc Eshel | 586759f | 2006-11-14 16:37:25 -0500 | [diff] [blame] | 104 | xop->callback = fl->fl_lmops->fl_grant; |
| 105 | locks_init_lock(&xop->flc); |
| 106 | locks_copy_lock(&xop->flc, fl); |
| 107 | xop->fl = fl; |
| 108 | xop->file = file; |
David Teigland | 2066b58 | 2007-12-06 09:35:25 -0600 | [diff] [blame] | 109 | } else { |
| 110 | op->info.owner = (__u64)(long) fl->fl_owner; |
Marc Eshel | 586759f | 2006-11-14 16:37:25 -0500 | [diff] [blame] | 111 | xop->callback = NULL; |
David Teigland | 2066b58 | 2007-12-06 09:35:25 -0600 | [diff] [blame] | 112 | } |
David Teigland | 869d81d | 2006-01-17 08:47:12 +0000 | [diff] [blame] | 113 | |
| 114 | send_op(op); |
Marc Eshel | 586759f | 2006-11-14 16:37:25 -0500 | [diff] [blame] | 115 | |
| 116 | if (xop->callback == NULL) |
| 117 | wait_event(recv_wq, (op->done != 0)); |
David Teigland | 2402211 | 2008-03-14 15:09:15 -0500 | [diff] [blame] | 118 | else { |
Miklos Szeredi | bde74e4 | 2008-07-25 01:48:57 -0700 | [diff] [blame] | 119 | rv = FILE_LOCK_DEFERRED; |
David Teigland | 2402211 | 2008-03-14 15:09:15 -0500 | [diff] [blame] | 120 | goto out; |
| 121 | } |
David Teigland | 869d81d | 2006-01-17 08:47:12 +0000 | [diff] [blame] | 122 | |
| 123 | spin_lock(&ops_lock); |
| 124 | if (!list_empty(&op->list)) { |
David Teigland | 2402211 | 2008-03-14 15:09:15 -0500 | [diff] [blame] | 125 | log_error(ls, "dlm_posix_lock: op on list %llx", |
| 126 | (unsigned long long)number); |
David Teigland | 869d81d | 2006-01-17 08:47:12 +0000 | [diff] [blame] | 127 | list_del(&op->list); |
| 128 | } |
| 129 | spin_unlock(&ops_lock); |
| 130 | |
| 131 | rv = op->info.rv; |
| 132 | |
| 133 | if (!rv) { |
| 134 | if (posix_lock_file_wait(file, fl) < 0) |
David Teigland | 2402211 | 2008-03-14 15:09:15 -0500 | [diff] [blame] | 135 | log_error(ls, "dlm_posix_lock: vfs lock error %llx", |
| 136 | (unsigned long long)number); |
David Teigland | 869d81d | 2006-01-17 08:47:12 +0000 | [diff] [blame] | 137 | } |
| 138 | |
Marc Eshel | 586759f | 2006-11-14 16:37:25 -0500 | [diff] [blame] | 139 | kfree(xop); |
David Teigland | 2402211 | 2008-03-14 15:09:15 -0500 | [diff] [blame] | 140 | out: |
| 141 | dlm_put_lockspace(ls); |
Marc Eshel | 586759f | 2006-11-14 16:37:25 -0500 | [diff] [blame] | 142 | return rv; |
| 143 | } |
David Teigland | 2402211 | 2008-03-14 15:09:15 -0500 | [diff] [blame] | 144 | EXPORT_SYMBOL_GPL(dlm_posix_lock); |
Marc Eshel | 586759f | 2006-11-14 16:37:25 -0500 | [diff] [blame] | 145 | |
| 146 | /* Returns failure iff a succesful lock operation should be canceled */ |
David Teigland | 2402211 | 2008-03-14 15:09:15 -0500 | [diff] [blame] | 147 | static int dlm_plock_callback(struct plock_op *op) |
Marc Eshel | 586759f | 2006-11-14 16:37:25 -0500 | [diff] [blame] | 148 | { |
| 149 | struct file *file; |
| 150 | struct file_lock *fl; |
| 151 | struct file_lock *flc; |
| 152 | int (*notify)(void *, void *, int) = NULL; |
| 153 | struct plock_xop *xop = (struct plock_xop *)op; |
| 154 | int rv = 0; |
| 155 | |
| 156 | spin_lock(&ops_lock); |
| 157 | if (!list_empty(&op->list)) { |
David Teigland | 2402211 | 2008-03-14 15:09:15 -0500 | [diff] [blame] | 158 | log_print("dlm_plock_callback: op on list %llx", |
| 159 | (unsigned long long)op->info.number); |
Marc Eshel | 586759f | 2006-11-14 16:37:25 -0500 | [diff] [blame] | 160 | list_del(&op->list); |
| 161 | } |
| 162 | spin_unlock(&ops_lock); |
| 163 | |
| 164 | /* check if the following 2 are still valid or make a copy */ |
| 165 | file = xop->file; |
| 166 | flc = &xop->flc; |
| 167 | fl = xop->fl; |
| 168 | notify = xop->callback; |
| 169 | |
| 170 | if (op->info.rv) { |
David Teigland | 24179f4 | 2009-01-19 13:13:33 -0600 | [diff] [blame] | 171 | notify(fl, NULL, op->info.rv); |
Marc Eshel | 586759f | 2006-11-14 16:37:25 -0500 | [diff] [blame] | 172 | goto out; |
| 173 | } |
| 174 | |
| 175 | /* got fs lock; bookkeep locally as well: */ |
| 176 | flc->fl_flags &= ~FL_SLEEP; |
| 177 | if (posix_lock_file(file, flc, NULL)) { |
| 178 | /* |
| 179 | * This can only happen in the case of kmalloc() failure. |
| 180 | * The filesystem's own lock is the authoritative lock, |
| 181 | * so a failure to get the lock locally is not a disaster. |
David Teigland | 2402211 | 2008-03-14 15:09:15 -0500 | [diff] [blame] | 182 | * As long as the fs cannot reliably cancel locks (especially |
Marc Eshel | 586759f | 2006-11-14 16:37:25 -0500 | [diff] [blame] | 183 | * in a low-memory situation), we're better off ignoring |
| 184 | * this failure than trying to recover. |
| 185 | */ |
David Teigland | 2402211 | 2008-03-14 15:09:15 -0500 | [diff] [blame] | 186 | log_print("dlm_plock_callback: vfs lock error %llx file %p fl %p", |
| 187 | (unsigned long long)op->info.number, file, fl); |
Marc Eshel | 586759f | 2006-11-14 16:37:25 -0500 | [diff] [blame] | 188 | } |
| 189 | |
David Teigland | 24179f4 | 2009-01-19 13:13:33 -0600 | [diff] [blame] | 190 | rv = notify(fl, NULL, 0); |
Marc Eshel | 586759f | 2006-11-14 16:37:25 -0500 | [diff] [blame] | 191 | if (rv) { |
| 192 | /* XXX: We need to cancel the fs lock here: */ |
David Teigland | 2402211 | 2008-03-14 15:09:15 -0500 | [diff] [blame] | 193 | log_print("dlm_plock_callback: lock granted after lock request " |
| 194 | "failed; dangling lock!\n"); |
Marc Eshel | 586759f | 2006-11-14 16:37:25 -0500 | [diff] [blame] | 195 | goto out; |
| 196 | } |
| 197 | |
| 198 | out: |
| 199 | kfree(xop); |
David Teigland | 869d81d | 2006-01-17 08:47:12 +0000 | [diff] [blame] | 200 | return rv; |
| 201 | } |
| 202 | |
David Teigland | 2402211 | 2008-03-14 15:09:15 -0500 | [diff] [blame] | 203 | int dlm_posix_unlock(dlm_lockspace_t *lockspace, u64 number, struct file *file, |
| 204 | struct file_lock *fl) |
David Teigland | 869d81d | 2006-01-17 08:47:12 +0000 | [diff] [blame] | 205 | { |
David Teigland | 2402211 | 2008-03-14 15:09:15 -0500 | [diff] [blame] | 206 | struct dlm_ls *ls; |
David Teigland | 869d81d | 2006-01-17 08:47:12 +0000 | [diff] [blame] | 207 | struct plock_op *op; |
| 208 | int rv; |
| 209 | |
David Teigland | 2402211 | 2008-03-14 15:09:15 -0500 | [diff] [blame] | 210 | ls = dlm_find_lockspace_local(lockspace); |
| 211 | if (!ls) |
| 212 | return -EINVAL; |
| 213 | |
David Teigland | 869d81d | 2006-01-17 08:47:12 +0000 | [diff] [blame] | 214 | op = kzalloc(sizeof(*op), GFP_KERNEL); |
David Teigland | 2402211 | 2008-03-14 15:09:15 -0500 | [diff] [blame] | 215 | if (!op) { |
| 216 | rv = -ENOMEM; |
| 217 | goto out; |
| 218 | } |
David Teigland | 869d81d | 2006-01-17 08:47:12 +0000 | [diff] [blame] | 219 | |
| 220 | if (posix_lock_file_wait(file, fl) < 0) |
David Teigland | 2402211 | 2008-03-14 15:09:15 -0500 | [diff] [blame] | 221 | log_error(ls, "dlm_posix_unlock: vfs unlock error %llx", |
| 222 | (unsigned long long)number); |
David Teigland | 869d81d | 2006-01-17 08:47:12 +0000 | [diff] [blame] | 223 | |
David Teigland | 2402211 | 2008-03-14 15:09:15 -0500 | [diff] [blame] | 224 | op->info.optype = DLM_PLOCK_OP_UNLOCK; |
David Teigland | 3a2a9c9 | 2006-04-25 15:45:51 -0400 | [diff] [blame] | 225 | op->info.pid = fl->fl_pid; |
David Teigland | 2402211 | 2008-03-14 15:09:15 -0500 | [diff] [blame] | 226 | op->info.fsid = ls->ls_global_id; |
| 227 | op->info.number = number; |
David Teigland | 869d81d | 2006-01-17 08:47:12 +0000 | [diff] [blame] | 228 | op->info.start = fl->fl_start; |
| 229 | op->info.end = fl->fl_end; |
David Teigland | 2066b58 | 2007-12-06 09:35:25 -0600 | [diff] [blame] | 230 | if (fl->fl_lmops && fl->fl_lmops->fl_grant) |
| 231 | op->info.owner = (__u64) fl->fl_pid; |
| 232 | else |
| 233 | op->info.owner = (__u64)(long) fl->fl_owner; |
David Teigland | 869d81d | 2006-01-17 08:47:12 +0000 | [diff] [blame] | 234 | |
| 235 | send_op(op); |
| 236 | wait_event(recv_wq, (op->done != 0)); |
| 237 | |
| 238 | spin_lock(&ops_lock); |
| 239 | if (!list_empty(&op->list)) { |
David Teigland | 2402211 | 2008-03-14 15:09:15 -0500 | [diff] [blame] | 240 | log_error(ls, "dlm_posix_unlock: op on list %llx", |
| 241 | (unsigned long long)number); |
David Teigland | 869d81d | 2006-01-17 08:47:12 +0000 | [diff] [blame] | 242 | list_del(&op->list); |
| 243 | } |
| 244 | spin_unlock(&ops_lock); |
| 245 | |
| 246 | rv = op->info.rv; |
| 247 | |
Marc Eshel | 586759f | 2006-11-14 16:37:25 -0500 | [diff] [blame] | 248 | if (rv == -ENOENT) |
| 249 | rv = 0; |
| 250 | |
David Teigland | 869d81d | 2006-01-17 08:47:12 +0000 | [diff] [blame] | 251 | kfree(op); |
David Teigland | 2402211 | 2008-03-14 15:09:15 -0500 | [diff] [blame] | 252 | out: |
| 253 | dlm_put_lockspace(ls); |
David Teigland | 869d81d | 2006-01-17 08:47:12 +0000 | [diff] [blame] | 254 | return rv; |
| 255 | } |
David Teigland | 2402211 | 2008-03-14 15:09:15 -0500 | [diff] [blame] | 256 | EXPORT_SYMBOL_GPL(dlm_posix_unlock); |
David Teigland | 869d81d | 2006-01-17 08:47:12 +0000 | [diff] [blame] | 257 | |
David Teigland | 2402211 | 2008-03-14 15:09:15 -0500 | [diff] [blame] | 258 | int dlm_posix_get(dlm_lockspace_t *lockspace, u64 number, struct file *file, |
| 259 | struct file_lock *fl) |
David Teigland | 869d81d | 2006-01-17 08:47:12 +0000 | [diff] [blame] | 260 | { |
David Teigland | 2402211 | 2008-03-14 15:09:15 -0500 | [diff] [blame] | 261 | struct dlm_ls *ls; |
David Teigland | 869d81d | 2006-01-17 08:47:12 +0000 | [diff] [blame] | 262 | struct plock_op *op; |
| 263 | int rv; |
| 264 | |
David Teigland | 2402211 | 2008-03-14 15:09:15 -0500 | [diff] [blame] | 265 | ls = dlm_find_lockspace_local(lockspace); |
| 266 | if (!ls) |
| 267 | return -EINVAL; |
David Teigland | 869d81d | 2006-01-17 08:47:12 +0000 | [diff] [blame] | 268 | |
David Teigland | 2402211 | 2008-03-14 15:09:15 -0500 | [diff] [blame] | 269 | op = kzalloc(sizeof(*op), GFP_KERNEL); |
| 270 | if (!op) { |
| 271 | rv = -ENOMEM; |
| 272 | goto out; |
| 273 | } |
| 274 | |
| 275 | op->info.optype = DLM_PLOCK_OP_GET; |
David Teigland | 3a2a9c9 | 2006-04-25 15:45:51 -0400 | [diff] [blame] | 276 | op->info.pid = fl->fl_pid; |
David Teigland | 869d81d | 2006-01-17 08:47:12 +0000 | [diff] [blame] | 277 | op->info.ex = (fl->fl_type == F_WRLCK); |
David Teigland | 2402211 | 2008-03-14 15:09:15 -0500 | [diff] [blame] | 278 | op->info.fsid = ls->ls_global_id; |
| 279 | op->info.number = number; |
David Teigland | 869d81d | 2006-01-17 08:47:12 +0000 | [diff] [blame] | 280 | op->info.start = fl->fl_start; |
| 281 | op->info.end = fl->fl_end; |
David Teigland | 2066b58 | 2007-12-06 09:35:25 -0600 | [diff] [blame] | 282 | if (fl->fl_lmops && fl->fl_lmops->fl_grant) |
| 283 | op->info.owner = (__u64) fl->fl_pid; |
| 284 | else |
| 285 | op->info.owner = (__u64)(long) fl->fl_owner; |
Marc Eshel | 586759f | 2006-11-14 16:37:25 -0500 | [diff] [blame] | 286 | |
David Teigland | 869d81d | 2006-01-17 08:47:12 +0000 | [diff] [blame] | 287 | send_op(op); |
| 288 | wait_event(recv_wq, (op->done != 0)); |
| 289 | |
| 290 | spin_lock(&ops_lock); |
| 291 | if (!list_empty(&op->list)) { |
David Teigland | 2402211 | 2008-03-14 15:09:15 -0500 | [diff] [blame] | 292 | log_error(ls, "dlm_posix_get: op on list %llx", |
| 293 | (unsigned long long)number); |
David Teigland | 869d81d | 2006-01-17 08:47:12 +0000 | [diff] [blame] | 294 | list_del(&op->list); |
| 295 | } |
| 296 | spin_unlock(&ops_lock); |
| 297 | |
David Teigland | a7a2ff8 | 2007-06-08 17:01:40 -0500 | [diff] [blame] | 298 | /* info.rv from userspace is 1 for conflict, 0 for no-conflict, |
| 299 | -ENOENT if there are no locks on the file */ |
| 300 | |
David Teigland | 869d81d | 2006-01-17 08:47:12 +0000 | [diff] [blame] | 301 | rv = op->info.rv; |
| 302 | |
Marc Eshel | 586759f | 2006-11-14 16:37:25 -0500 | [diff] [blame] | 303 | fl->fl_type = F_UNLCK; |
| 304 | if (rv == -ENOENT) |
| 305 | rv = 0; |
David Teigland | a7a2ff8 | 2007-06-08 17:01:40 -0500 | [diff] [blame] | 306 | else if (rv > 0) { |
Jeff Layton | 20d5a39 | 2009-01-21 11:34:50 -0500 | [diff] [blame] | 307 | locks_init_lock(fl); |
David Teigland | 869d81d | 2006-01-17 08:47:12 +0000 | [diff] [blame] | 308 | fl->fl_type = (op->info.ex) ? F_WRLCK : F_RDLCK; |
Jeff Layton | 20d5a39 | 2009-01-21 11:34:50 -0500 | [diff] [blame] | 309 | fl->fl_flags = FL_POSIX; |
David Teigland | 869d81d | 2006-01-17 08:47:12 +0000 | [diff] [blame] | 310 | fl->fl_pid = op->info.pid; |
| 311 | fl->fl_start = op->info.start; |
| 312 | fl->fl_end = op->info.end; |
David Teigland | a7a2ff8 | 2007-06-08 17:01:40 -0500 | [diff] [blame] | 313 | rv = 0; |
David Teigland | 869d81d | 2006-01-17 08:47:12 +0000 | [diff] [blame] | 314 | } |
| 315 | |
| 316 | kfree(op); |
David Teigland | 2402211 | 2008-03-14 15:09:15 -0500 | [diff] [blame] | 317 | out: |
| 318 | dlm_put_lockspace(ls); |
David Teigland | 869d81d | 2006-01-17 08:47:12 +0000 | [diff] [blame] | 319 | return rv; |
| 320 | } |
David Teigland | 2402211 | 2008-03-14 15:09:15 -0500 | [diff] [blame] | 321 | EXPORT_SYMBOL_GPL(dlm_posix_get); |
David Teigland | 869d81d | 2006-01-17 08:47:12 +0000 | [diff] [blame] | 322 | |
| 323 | /* a read copies out one plock request from the send list */ |
| 324 | static ssize_t dev_read(struct file *file, char __user *u, size_t count, |
| 325 | loff_t *ppos) |
| 326 | { |
David Teigland | 2402211 | 2008-03-14 15:09:15 -0500 | [diff] [blame] | 327 | struct dlm_plock_info info; |
David Teigland | 869d81d | 2006-01-17 08:47:12 +0000 | [diff] [blame] | 328 | struct plock_op *op = NULL; |
| 329 | |
| 330 | if (count < sizeof(info)) |
| 331 | return -EINVAL; |
| 332 | |
| 333 | spin_lock(&ops_lock); |
| 334 | if (!list_empty(&send_list)) { |
| 335 | op = list_entry(send_list.next, struct plock_op, list); |
| 336 | list_move(&op->list, &recv_list); |
| 337 | memcpy(&info, &op->info, sizeof(info)); |
| 338 | } |
| 339 | spin_unlock(&ops_lock); |
| 340 | |
| 341 | if (!op) |
| 342 | return -EAGAIN; |
| 343 | |
| 344 | if (copy_to_user(u, &info, sizeof(info))) |
| 345 | return -EFAULT; |
| 346 | return sizeof(info); |
| 347 | } |
| 348 | |
| 349 | /* a write copies in one plock result that should match a plock_op |
| 350 | on the recv list */ |
| 351 | static ssize_t dev_write(struct file *file, const char __user *u, size_t count, |
| 352 | loff_t *ppos) |
| 353 | { |
David Teigland | 2402211 | 2008-03-14 15:09:15 -0500 | [diff] [blame] | 354 | struct dlm_plock_info info; |
David Teigland | 869d81d | 2006-01-17 08:47:12 +0000 | [diff] [blame] | 355 | struct plock_op *op; |
| 356 | int found = 0; |
| 357 | |
| 358 | if (count != sizeof(info)) |
| 359 | return -EINVAL; |
| 360 | |
| 361 | if (copy_from_user(&info, u, sizeof(info))) |
| 362 | return -EFAULT; |
| 363 | |
| 364 | if (check_version(&info)) |
| 365 | return -EINVAL; |
| 366 | |
| 367 | spin_lock(&ops_lock); |
| 368 | list_for_each_entry(op, &recv_list, list) { |
Steven Whitehouse | 9b47c11 | 2006-09-08 10:17:58 -0400 | [diff] [blame] | 369 | if (op->info.fsid == info.fsid && op->info.number == info.number && |
David Teigland | 08eac93 | 2006-08-04 16:19:20 -0500 | [diff] [blame] | 370 | op->info.owner == info.owner) { |
David Teigland | 869d81d | 2006-01-17 08:47:12 +0000 | [diff] [blame] | 371 | list_del_init(&op->list); |
| 372 | found = 1; |
| 373 | op->done = 1; |
| 374 | memcpy(&op->info, &info, sizeof(info)); |
| 375 | break; |
| 376 | } |
| 377 | } |
| 378 | spin_unlock(&ops_lock); |
| 379 | |
Marc Eshel | 586759f | 2006-11-14 16:37:25 -0500 | [diff] [blame] | 380 | if (found) { |
| 381 | struct plock_xop *xop; |
| 382 | xop = (struct plock_xop *)op; |
| 383 | if (xop->callback) |
David Teigland | 817d10b | 2008-05-13 14:28:26 -0500 | [diff] [blame] | 384 | dlm_plock_callback(op); |
Marc Eshel | 586759f | 2006-11-14 16:37:25 -0500 | [diff] [blame] | 385 | else |
| 386 | wake_up(&recv_wq); |
| 387 | } else |
David Teigland | 2402211 | 2008-03-14 15:09:15 -0500 | [diff] [blame] | 388 | log_print("dev_write no op %x %llx", info.fsid, |
| 389 | (unsigned long long)info.number); |
David Teigland | 869d81d | 2006-01-17 08:47:12 +0000 | [diff] [blame] | 390 | return count; |
| 391 | } |
| 392 | |
| 393 | static unsigned int dev_poll(struct file *file, poll_table *wait) |
| 394 | { |
Denis Cheng | cee23c7 | 2007-07-25 17:53:58 +0800 | [diff] [blame] | 395 | unsigned int mask = 0; |
| 396 | |
David Teigland | 869d81d | 2006-01-17 08:47:12 +0000 | [diff] [blame] | 397 | poll_wait(file, &send_wq, wait); |
| 398 | |
| 399 | spin_lock(&ops_lock); |
Denis Cheng | cee23c7 | 2007-07-25 17:53:58 +0800 | [diff] [blame] | 400 | if (!list_empty(&send_list)) |
| 401 | mask = POLLIN | POLLRDNORM; |
David Teigland | 869d81d | 2006-01-17 08:47:12 +0000 | [diff] [blame] | 402 | spin_unlock(&ops_lock); |
Denis Cheng | cee23c7 | 2007-07-25 17:53:58 +0800 | [diff] [blame] | 403 | |
| 404 | return mask; |
David Teigland | 869d81d | 2006-01-17 08:47:12 +0000 | [diff] [blame] | 405 | } |
| 406 | |
Arjan van de Ven | 00977a5 | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 407 | static const struct file_operations dev_fops = { |
David Teigland | 869d81d | 2006-01-17 08:47:12 +0000 | [diff] [blame] | 408 | .read = dev_read, |
| 409 | .write = dev_write, |
| 410 | .poll = dev_poll, |
| 411 | .owner = THIS_MODULE |
| 412 | }; |
| 413 | |
| 414 | static struct miscdevice plock_dev_misc = { |
| 415 | .minor = MISC_DYNAMIC_MINOR, |
David Teigland | 2402211 | 2008-03-14 15:09:15 -0500 | [diff] [blame] | 416 | .name = DLM_PLOCK_MISC_NAME, |
David Teigland | 869d81d | 2006-01-17 08:47:12 +0000 | [diff] [blame] | 417 | .fops = &dev_fops |
| 418 | }; |
| 419 | |
David Teigland | 2402211 | 2008-03-14 15:09:15 -0500 | [diff] [blame] | 420 | int dlm_plock_init(void) |
David Teigland | 869d81d | 2006-01-17 08:47:12 +0000 | [diff] [blame] | 421 | { |
| 422 | int rv; |
| 423 | |
| 424 | spin_lock_init(&ops_lock); |
| 425 | INIT_LIST_HEAD(&send_list); |
| 426 | INIT_LIST_HEAD(&recv_list); |
| 427 | init_waitqueue_head(&send_wq); |
| 428 | init_waitqueue_head(&recv_wq); |
| 429 | |
| 430 | rv = misc_register(&plock_dev_misc); |
| 431 | if (rv) |
David Teigland | 2402211 | 2008-03-14 15:09:15 -0500 | [diff] [blame] | 432 | log_print("dlm_plock_init: misc_register failed %d", rv); |
David Teigland | 869d81d | 2006-01-17 08:47:12 +0000 | [diff] [blame] | 433 | return rv; |
| 434 | } |
| 435 | |
David Teigland | 2402211 | 2008-03-14 15:09:15 -0500 | [diff] [blame] | 436 | void dlm_plock_exit(void) |
David Teigland | 869d81d | 2006-01-17 08:47:12 +0000 | [diff] [blame] | 437 | { |
| 438 | if (misc_deregister(&plock_dev_misc) < 0) |
David Teigland | 2402211 | 2008-03-14 15:09:15 -0500 | [diff] [blame] | 439 | log_print("dlm_plock_exit: misc_deregister failed"); |
David Teigland | 869d81d | 2006-01-17 08:47:12 +0000 | [diff] [blame] | 440 | } |
| 441 | |