1597d0caeSDavid Teigland /* 2ef0c2bb0SDavid Teigland * Copyright (C) 2006-2007 Red Hat, Inc. All rights reserved. 3597d0caeSDavid Teigland * 4597d0caeSDavid Teigland * This copyrighted material is made available to anyone wishing to use, 5597d0caeSDavid Teigland * modify, copy, or redistribute it subject to the terms and conditions 6597d0caeSDavid Teigland * of the GNU General Public License v.2. 7597d0caeSDavid Teigland */ 8597d0caeSDavid Teigland 9597d0caeSDavid Teigland #include <linux/miscdevice.h> 10597d0caeSDavid Teigland #include <linux/init.h> 11597d0caeSDavid Teigland #include <linux/wait.h> 12597d0caeSDavid Teigland #include <linux/module.h> 13597d0caeSDavid Teigland #include <linux/file.h> 14597d0caeSDavid Teigland #include <linux/fs.h> 15597d0caeSDavid Teigland #include <linux/poll.h> 16597d0caeSDavid Teigland #include <linux/signal.h> 17597d0caeSDavid Teigland #include <linux/spinlock.h> 18597d0caeSDavid Teigland #include <linux/dlm.h> 19597d0caeSDavid Teigland #include <linux/dlm_device.h> 20597d0caeSDavid Teigland 21597d0caeSDavid Teigland #include "dlm_internal.h" 22597d0caeSDavid Teigland #include "lockspace.h" 23597d0caeSDavid Teigland #include "lock.h" 24597d0caeSDavid Teigland #include "lvb_table.h" 2584c6e8cdSAdrian Bunk #include "user.h" 26597d0caeSDavid Teigland 270fe410d3SDenis Cheng static const char name_prefix[] = "dlm"; 2800977a59SArjan van de Ven static const struct file_operations device_fops; 29597d0caeSDavid Teigland 30597d0caeSDavid Teigland #ifdef CONFIG_COMPAT 31597d0caeSDavid Teigland 32597d0caeSDavid Teigland struct dlm_lock_params32 { 33597d0caeSDavid Teigland __u8 mode; 34597d0caeSDavid Teigland __u8 namelen; 35d7db923eSDavid Teigland __u16 unused; 36d7db923eSDavid Teigland __u32 flags; 37597d0caeSDavid Teigland __u32 lkid; 38597d0caeSDavid Teigland __u32 parent; 39d7db923eSDavid Teigland __u64 xid; 40d7db923eSDavid Teigland __u64 timeout; 41597d0caeSDavid Teigland __u32 castparam; 42597d0caeSDavid Teigland __u32 castaddr; 43597d0caeSDavid Teigland __u32 bastparam; 44597d0caeSDavid Teigland __u32 bastaddr; 45597d0caeSDavid Teigland __u32 lksb; 46597d0caeSDavid Teigland char lvb[DLM_USER_LVB_LEN]; 47597d0caeSDavid Teigland char name[0]; 48597d0caeSDavid Teigland }; 49597d0caeSDavid Teigland 50597d0caeSDavid Teigland struct dlm_write_request32 { 51597d0caeSDavid Teigland __u32 version[3]; 52597d0caeSDavid Teigland __u8 cmd; 53597d0caeSDavid Teigland __u8 is64bit; 54597d0caeSDavid Teigland __u8 unused[2]; 55597d0caeSDavid Teigland 56597d0caeSDavid Teigland union { 57597d0caeSDavid Teigland struct dlm_lock_params32 lock; 58597d0caeSDavid Teigland struct dlm_lspace_params lspace; 5972c2be77SDavid Teigland struct dlm_purge_params purge; 60597d0caeSDavid Teigland } i; 61597d0caeSDavid Teigland }; 62597d0caeSDavid Teigland 63597d0caeSDavid Teigland struct dlm_lksb32 { 64597d0caeSDavid Teigland __u32 sb_status; 65597d0caeSDavid Teigland __u32 sb_lkid; 66597d0caeSDavid Teigland __u8 sb_flags; 67597d0caeSDavid Teigland __u32 sb_lvbptr; 68597d0caeSDavid Teigland }; 69597d0caeSDavid Teigland 70597d0caeSDavid Teigland struct dlm_lock_result32 { 71d7db923eSDavid Teigland __u32 version[3]; 72597d0caeSDavid Teigland __u32 length; 73597d0caeSDavid Teigland __u32 user_astaddr; 74597d0caeSDavid Teigland __u32 user_astparam; 75597d0caeSDavid Teigland __u32 user_lksb; 76597d0caeSDavid Teigland struct dlm_lksb32 lksb; 77597d0caeSDavid Teigland __u8 bast_mode; 78597d0caeSDavid Teigland __u8 unused[3]; 79597d0caeSDavid Teigland /* Offsets may be zero if no data is present */ 80597d0caeSDavid Teigland __u32 lvb_offset; 81597d0caeSDavid Teigland }; 82597d0caeSDavid Teigland 83597d0caeSDavid Teigland static void compat_input(struct dlm_write_request *kb, 842a79289eSPatrick Caulfeld struct dlm_write_request32 *kb32, 85cb79f199SAl Viro size_t count) 86597d0caeSDavid Teigland { 87597d0caeSDavid Teigland kb->version[0] = kb32->version[0]; 88597d0caeSDavid Teigland kb->version[1] = kb32->version[1]; 89597d0caeSDavid Teigland kb->version[2] = kb32->version[2]; 90597d0caeSDavid Teigland 91597d0caeSDavid Teigland kb->cmd = kb32->cmd; 92597d0caeSDavid Teigland kb->is64bit = kb32->is64bit; 93597d0caeSDavid Teigland if (kb->cmd == DLM_USER_CREATE_LOCKSPACE || 94597d0caeSDavid Teigland kb->cmd == DLM_USER_REMOVE_LOCKSPACE) { 95597d0caeSDavid Teigland kb->i.lspace.flags = kb32->i.lspace.flags; 96597d0caeSDavid Teigland kb->i.lspace.minor = kb32->i.lspace.minor; 97cb79f199SAl Viro memcpy(kb->i.lspace.name, kb32->i.lspace.name, count - 98cb79f199SAl Viro offsetof(struct dlm_write_request32, i.lspace.name)); 9972c2be77SDavid Teigland } else if (kb->cmd == DLM_USER_PURGE) { 10072c2be77SDavid Teigland kb->i.purge.nodeid = kb32->i.purge.nodeid; 10172c2be77SDavid Teigland kb->i.purge.pid = kb32->i.purge.pid; 102597d0caeSDavid Teigland } else { 103597d0caeSDavid Teigland kb->i.lock.mode = kb32->i.lock.mode; 104597d0caeSDavid Teigland kb->i.lock.namelen = kb32->i.lock.namelen; 105597d0caeSDavid Teigland kb->i.lock.flags = kb32->i.lock.flags; 106597d0caeSDavid Teigland kb->i.lock.lkid = kb32->i.lock.lkid; 107597d0caeSDavid Teigland kb->i.lock.parent = kb32->i.lock.parent; 108d7db923eSDavid Teigland kb->i.lock.xid = kb32->i.lock.xid; 109d7db923eSDavid Teigland kb->i.lock.timeout = kb32->i.lock.timeout; 110597d0caeSDavid Teigland kb->i.lock.castparam = (void *)(long)kb32->i.lock.castparam; 111597d0caeSDavid Teigland kb->i.lock.castaddr = (void *)(long)kb32->i.lock.castaddr; 112597d0caeSDavid Teigland kb->i.lock.bastparam = (void *)(long)kb32->i.lock.bastparam; 113597d0caeSDavid Teigland kb->i.lock.bastaddr = (void *)(long)kb32->i.lock.bastaddr; 114597d0caeSDavid Teigland kb->i.lock.lksb = (void *)(long)kb32->i.lock.lksb; 115597d0caeSDavid Teigland memcpy(kb->i.lock.lvb, kb32->i.lock.lvb, DLM_USER_LVB_LEN); 116cb79f199SAl Viro memcpy(kb->i.lock.name, kb32->i.lock.name, count - 117cb79f199SAl Viro offsetof(struct dlm_write_request32, i.lock.name)); 118597d0caeSDavid Teigland } 119597d0caeSDavid Teigland } 120597d0caeSDavid Teigland 121597d0caeSDavid Teigland static void compat_output(struct dlm_lock_result *res, 122597d0caeSDavid Teigland struct dlm_lock_result32 *res32) 123597d0caeSDavid Teigland { 124d7db923eSDavid Teigland res32->version[0] = res->version[0]; 125d7db923eSDavid Teigland res32->version[1] = res->version[1]; 126d7db923eSDavid Teigland res32->version[2] = res->version[2]; 127d7db923eSDavid Teigland 128597d0caeSDavid Teigland res32->user_astaddr = (__u32)(long)res->user_astaddr; 129597d0caeSDavid Teigland res32->user_astparam = (__u32)(long)res->user_astparam; 130597d0caeSDavid Teigland res32->user_lksb = (__u32)(long)res->user_lksb; 131597d0caeSDavid Teigland res32->bast_mode = res->bast_mode; 132597d0caeSDavid Teigland 133597d0caeSDavid Teigland res32->lvb_offset = res->lvb_offset; 134597d0caeSDavid Teigland res32->length = res->length; 135597d0caeSDavid Teigland 136597d0caeSDavid Teigland res32->lksb.sb_status = res->lksb.sb_status; 137597d0caeSDavid Teigland res32->lksb.sb_flags = res->lksb.sb_flags; 138597d0caeSDavid Teigland res32->lksb.sb_lkid = res->lksb.sb_lkid; 139597d0caeSDavid Teigland res32->lksb.sb_lvbptr = (__u32)(long)res->lksb.sb_lvbptr; 140597d0caeSDavid Teigland } 141597d0caeSDavid Teigland #endif 142597d0caeSDavid Teigland 14384d8cd69SDavid Teigland /* Figure out if this lock is at the end of its life and no longer 14484d8cd69SDavid Teigland available for the application to use. The lkb still exists until 14584d8cd69SDavid Teigland the final ast is read. A lock becomes EOL in three situations: 14684d8cd69SDavid Teigland 1. a noqueue request fails with EAGAIN 14784d8cd69SDavid Teigland 2. an unlock completes with EUNLOCK 14884d8cd69SDavid Teigland 3. a cancel of a waiting request completes with ECANCEL/EDEADLK 14984d8cd69SDavid Teigland An EOL lock needs to be removed from the process's list of locks. 15084d8cd69SDavid Teigland And we can't allow any new operation on an EOL lock. This is 15184d8cd69SDavid Teigland not related to the lifetime of the lkb struct which is managed 15284d8cd69SDavid Teigland entirely by refcount. */ 15384d8cd69SDavid Teigland 15484d8cd69SDavid Teigland static int lkb_is_endoflife(struct dlm_lkb *lkb, int sb_status, int type) 15584d8cd69SDavid Teigland { 15684d8cd69SDavid Teigland switch (sb_status) { 15784d8cd69SDavid Teigland case -DLM_EUNLOCK: 15884d8cd69SDavid Teigland return 1; 15984d8cd69SDavid Teigland case -DLM_ECANCEL: 16084d8cd69SDavid Teigland case -ETIMEDOUT: 1618b4021faSDavid Teigland case -EDEADLK: 16284d8cd69SDavid Teigland if (lkb->lkb_grmode == DLM_LOCK_IV) 16384d8cd69SDavid Teigland return 1; 16484d8cd69SDavid Teigland break; 16584d8cd69SDavid Teigland case -EAGAIN: 16684d8cd69SDavid Teigland if (type == AST_COMP && lkb->lkb_grmode == DLM_LOCK_IV) 16784d8cd69SDavid Teigland return 1; 16884d8cd69SDavid Teigland break; 16984d8cd69SDavid Teigland } 17084d8cd69SDavid Teigland return 0; 17184d8cd69SDavid Teigland } 17284d8cd69SDavid Teigland 173ef0c2bb0SDavid Teigland /* we could possibly check if the cancel of an orphan has resulted in the lkb 174ef0c2bb0SDavid Teigland being removed and then remove that lkb from the orphans list and free it */ 175597d0caeSDavid Teigland 176597d0caeSDavid Teigland void dlm_user_add_ast(struct dlm_lkb *lkb, int type) 177597d0caeSDavid Teigland { 178597d0caeSDavid Teigland struct dlm_ls *ls; 179597d0caeSDavid Teigland struct dlm_user_args *ua; 180597d0caeSDavid Teigland struct dlm_user_proc *proc; 181ef0c2bb0SDavid Teigland int eol = 0, ast_type; 182597d0caeSDavid Teigland 183ef0c2bb0SDavid Teigland if (lkb->lkb_flags & (DLM_IFL_ORPHAN | DLM_IFL_DEAD)) 184597d0caeSDavid Teigland return; 185597d0caeSDavid Teigland 186597d0caeSDavid Teigland ls = lkb->lkb_resource->res_ls; 187597d0caeSDavid Teigland mutex_lock(&ls->ls_clear_proc_locks); 188597d0caeSDavid Teigland 189597d0caeSDavid Teigland /* If ORPHAN/DEAD flag is set, it means the process is dead so an ast 190597d0caeSDavid Teigland can't be delivered. For ORPHAN's, dlm_clear_proc_locks() freed 191ef0c2bb0SDavid Teigland lkb->ua so we can't try to use it. This second check is necessary 192ef0c2bb0SDavid Teigland for cases where a completion ast is received for an operation that 193ef0c2bb0SDavid Teigland began before clear_proc_locks did its cancel/unlock. */ 194597d0caeSDavid Teigland 195ef0c2bb0SDavid Teigland if (lkb->lkb_flags & (DLM_IFL_ORPHAN | DLM_IFL_DEAD)) 196597d0caeSDavid Teigland goto out; 197597d0caeSDavid Teigland 198d292c0ccSDavid Teigland DLM_ASSERT(lkb->lkb_ua, dlm_print_lkb(lkb);); 199d292c0ccSDavid Teigland ua = lkb->lkb_ua; 200597d0caeSDavid Teigland proc = ua->proc; 201597d0caeSDavid Teigland 202597d0caeSDavid Teigland if (type == AST_BAST && ua->bastaddr == NULL) 203597d0caeSDavid Teigland goto out; 204597d0caeSDavid Teigland 205597d0caeSDavid Teigland spin_lock(&proc->asts_spin); 206ef0c2bb0SDavid Teigland 207ef0c2bb0SDavid Teigland ast_type = lkb->lkb_ast_type; 208ef0c2bb0SDavid Teigland lkb->lkb_ast_type |= type; 209ef0c2bb0SDavid Teigland 210ef0c2bb0SDavid Teigland if (!ast_type) { 211597d0caeSDavid Teigland kref_get(&lkb->lkb_ref); 212597d0caeSDavid Teigland list_add_tail(&lkb->lkb_astqueue, &proc->asts); 213597d0caeSDavid Teigland wake_up_interruptible(&proc->wait); 214597d0caeSDavid Teigland } 215ef0c2bb0SDavid Teigland if (type == AST_COMP && (ast_type & AST_COMP)) 216ef0c2bb0SDavid Teigland log_debug(ls, "ast overlap %x status %x %x", 217ef0c2bb0SDavid Teigland lkb->lkb_id, ua->lksb.sb_status, lkb->lkb_flags); 218597d0caeSDavid Teigland 21984d8cd69SDavid Teigland eol = lkb_is_endoflife(lkb, ua->lksb.sb_status, type); 220ef0c2bb0SDavid Teigland if (eol) { 221ef0c2bb0SDavid Teigland lkb->lkb_ast_type &= ~AST_BAST; 222ef0c2bb0SDavid Teigland lkb->lkb_flags |= DLM_IFL_ENDOFLIFE; 223ef0c2bb0SDavid Teigland } 224a1bc86e6SDavid Teigland 225597d0caeSDavid Teigland /* We want to copy the lvb to userspace when the completion 226597d0caeSDavid Teigland ast is read if the status is 0, the lock has an lvb and 227597d0caeSDavid Teigland lvb_ops says we should. We could probably have set_lvb_lock() 228597d0caeSDavid Teigland set update_user_lvb instead and not need old_mode */ 229597d0caeSDavid Teigland 230597d0caeSDavid Teigland if ((lkb->lkb_ast_type & AST_COMP) && 231597d0caeSDavid Teigland (lkb->lkb_lksb->sb_status == 0) && 232597d0caeSDavid Teigland lkb->lkb_lksb->sb_lvbptr && 233597d0caeSDavid Teigland dlm_lvb_operations[ua->old_mode + 1][lkb->lkb_grmode + 1]) 234597d0caeSDavid Teigland ua->update_user_lvb = 1; 235597d0caeSDavid Teigland else 236597d0caeSDavid Teigland ua->update_user_lvb = 0; 237597d0caeSDavid Teigland 238597d0caeSDavid Teigland spin_unlock(&proc->asts_spin); 23934e22bedSDavid Teigland 240ef0c2bb0SDavid Teigland if (eol) { 241ce5246b9SDavid Teigland spin_lock(&proc->locks_spin); 242ef0c2bb0SDavid Teigland if (!list_empty(&lkb->lkb_ownqueue)) { 24334e22bedSDavid Teigland list_del_init(&lkb->lkb_ownqueue); 24434e22bedSDavid Teigland dlm_put_lkb(lkb); 24534e22bedSDavid Teigland } 246ce5246b9SDavid Teigland spin_unlock(&proc->locks_spin); 247ef0c2bb0SDavid Teigland } 248597d0caeSDavid Teigland out: 249597d0caeSDavid Teigland mutex_unlock(&ls->ls_clear_proc_locks); 250597d0caeSDavid Teigland } 251597d0caeSDavid Teigland 252597d0caeSDavid Teigland static int device_user_lock(struct dlm_user_proc *proc, 253597d0caeSDavid Teigland struct dlm_lock_params *params) 254597d0caeSDavid Teigland { 255597d0caeSDavid Teigland struct dlm_ls *ls; 256597d0caeSDavid Teigland struct dlm_user_args *ua; 257597d0caeSDavid Teigland int error = -ENOMEM; 258597d0caeSDavid Teigland 259597d0caeSDavid Teigland ls = dlm_find_lockspace_local(proc->lockspace); 260597d0caeSDavid Teigland if (!ls) 261597d0caeSDavid Teigland return -ENOENT; 262597d0caeSDavid Teigland 263597d0caeSDavid Teigland if (!params->castaddr || !params->lksb) { 264597d0caeSDavid Teigland error = -EINVAL; 265597d0caeSDavid Teigland goto out; 266597d0caeSDavid Teigland } 267597d0caeSDavid Teigland 268597d0caeSDavid Teigland ua = kzalloc(sizeof(struct dlm_user_args), GFP_KERNEL); 269597d0caeSDavid Teigland if (!ua) 270597d0caeSDavid Teigland goto out; 271597d0caeSDavid Teigland ua->proc = proc; 272597d0caeSDavid Teigland ua->user_lksb = params->lksb; 273597d0caeSDavid Teigland ua->castparam = params->castparam; 274597d0caeSDavid Teigland ua->castaddr = params->castaddr; 275597d0caeSDavid Teigland ua->bastparam = params->bastparam; 276597d0caeSDavid Teigland ua->bastaddr = params->bastaddr; 277d7db923eSDavid Teigland ua->xid = params->xid; 278597d0caeSDavid Teigland 279597d0caeSDavid Teigland if (params->flags & DLM_LKF_CONVERT) 280597d0caeSDavid Teigland error = dlm_user_convert(ls, ua, 281597d0caeSDavid Teigland params->mode, params->flags, 282d7db923eSDavid Teigland params->lkid, params->lvb, 283d7db923eSDavid Teigland (unsigned long) params->timeout); 284597d0caeSDavid Teigland else { 285597d0caeSDavid Teigland error = dlm_user_request(ls, ua, 286597d0caeSDavid Teigland params->mode, params->flags, 287597d0caeSDavid Teigland params->name, params->namelen, 288d7db923eSDavid Teigland (unsigned long) params->timeout); 289597d0caeSDavid Teigland if (!error) 290597d0caeSDavid Teigland error = ua->lksb.sb_lkid; 291597d0caeSDavid Teigland } 292597d0caeSDavid Teigland out: 293597d0caeSDavid Teigland dlm_put_lockspace(ls); 294597d0caeSDavid Teigland return error; 295597d0caeSDavid Teigland } 296597d0caeSDavid Teigland 297597d0caeSDavid Teigland static int device_user_unlock(struct dlm_user_proc *proc, 298597d0caeSDavid Teigland struct dlm_lock_params *params) 299597d0caeSDavid Teigland { 300597d0caeSDavid Teigland struct dlm_ls *ls; 301597d0caeSDavid Teigland struct dlm_user_args *ua; 302597d0caeSDavid Teigland int error = -ENOMEM; 303597d0caeSDavid Teigland 304597d0caeSDavid Teigland ls = dlm_find_lockspace_local(proc->lockspace); 305597d0caeSDavid Teigland if (!ls) 306597d0caeSDavid Teigland return -ENOENT; 307597d0caeSDavid Teigland 308597d0caeSDavid Teigland ua = kzalloc(sizeof(struct dlm_user_args), GFP_KERNEL); 309597d0caeSDavid Teigland if (!ua) 310597d0caeSDavid Teigland goto out; 311597d0caeSDavid Teigland ua->proc = proc; 312597d0caeSDavid Teigland ua->user_lksb = params->lksb; 313597d0caeSDavid Teigland ua->castparam = params->castparam; 314597d0caeSDavid Teigland ua->castaddr = params->castaddr; 315597d0caeSDavid Teigland 316597d0caeSDavid Teigland if (params->flags & DLM_LKF_CANCEL) 317597d0caeSDavid Teigland error = dlm_user_cancel(ls, ua, params->flags, params->lkid); 318597d0caeSDavid Teigland else 319597d0caeSDavid Teigland error = dlm_user_unlock(ls, ua, params->flags, params->lkid, 320597d0caeSDavid Teigland params->lvb); 321597d0caeSDavid Teigland out: 322597d0caeSDavid Teigland dlm_put_lockspace(ls); 323597d0caeSDavid Teigland return error; 324597d0caeSDavid Teigland } 325597d0caeSDavid Teigland 3268b4021faSDavid Teigland static int device_user_deadlock(struct dlm_user_proc *proc, 3278b4021faSDavid Teigland struct dlm_lock_params *params) 3288b4021faSDavid Teigland { 3298b4021faSDavid Teigland struct dlm_ls *ls; 3308b4021faSDavid Teigland int error; 3318b4021faSDavid Teigland 3328b4021faSDavid Teigland ls = dlm_find_lockspace_local(proc->lockspace); 3338b4021faSDavid Teigland if (!ls) 3348b4021faSDavid Teigland return -ENOENT; 3358b4021faSDavid Teigland 3368b4021faSDavid Teigland error = dlm_user_deadlock(ls, params->flags, params->lkid); 3378b4021faSDavid Teigland 3388b4021faSDavid Teigland dlm_put_lockspace(ls); 3398b4021faSDavid Teigland return error; 3408b4021faSDavid Teigland } 3418b4021faSDavid Teigland 342254da030SPatrick Caulfield static int create_misc_device(struct dlm_ls *ls, char *name) 343254da030SPatrick Caulfield { 344254da030SPatrick Caulfield int error, len; 345254da030SPatrick Caulfield 346254da030SPatrick Caulfield error = -ENOMEM; 347254da030SPatrick Caulfield len = strlen(name) + strlen(name_prefix) + 2; 348254da030SPatrick Caulfield ls->ls_device.name = kzalloc(len, GFP_KERNEL); 349254da030SPatrick Caulfield if (!ls->ls_device.name) 350254da030SPatrick Caulfield goto fail; 351254da030SPatrick Caulfield 352254da030SPatrick Caulfield snprintf((char *)ls->ls_device.name, len, "%s_%s", name_prefix, 353254da030SPatrick Caulfield name); 354254da030SPatrick Caulfield ls->ls_device.fops = &device_fops; 355254da030SPatrick Caulfield ls->ls_device.minor = MISC_DYNAMIC_MINOR; 356254da030SPatrick Caulfield 357254da030SPatrick Caulfield error = misc_register(&ls->ls_device); 358254da030SPatrick Caulfield if (error) { 359254da030SPatrick Caulfield kfree(ls->ls_device.name); 360254da030SPatrick Caulfield } 361254da030SPatrick Caulfield fail: 362254da030SPatrick Caulfield return error; 363254da030SPatrick Caulfield } 364254da030SPatrick Caulfield 36572c2be77SDavid Teigland static int device_user_purge(struct dlm_user_proc *proc, 36672c2be77SDavid Teigland struct dlm_purge_params *params) 36772c2be77SDavid Teigland { 36872c2be77SDavid Teigland struct dlm_ls *ls; 36972c2be77SDavid Teigland int error; 37072c2be77SDavid Teigland 37172c2be77SDavid Teigland ls = dlm_find_lockspace_local(proc->lockspace); 37272c2be77SDavid Teigland if (!ls) 37372c2be77SDavid Teigland return -ENOENT; 37472c2be77SDavid Teigland 37572c2be77SDavid Teigland error = dlm_user_purge(ls, proc, params->nodeid, params->pid); 37672c2be77SDavid Teigland 37772c2be77SDavid Teigland dlm_put_lockspace(ls); 37872c2be77SDavid Teigland return error; 37972c2be77SDavid Teigland } 38072c2be77SDavid Teigland 381597d0caeSDavid Teigland static int device_create_lockspace(struct dlm_lspace_params *params) 382597d0caeSDavid Teigland { 383597d0caeSDavid Teigland dlm_lockspace_t *lockspace; 384597d0caeSDavid Teigland struct dlm_ls *ls; 385254da030SPatrick Caulfield int error; 386597d0caeSDavid Teigland 387597d0caeSDavid Teigland if (!capable(CAP_SYS_ADMIN)) 388597d0caeSDavid Teigland return -EPERM; 389597d0caeSDavid Teigland 390597d0caeSDavid Teigland error = dlm_new_lockspace(params->name, strlen(params->name), 3913ae1acf9SDavid Teigland &lockspace, params->flags, DLM_USER_LVB_LEN); 392597d0caeSDavid Teigland if (error) 393597d0caeSDavid Teigland return error; 394597d0caeSDavid Teigland 395597d0caeSDavid Teigland ls = dlm_find_lockspace_local(lockspace); 396597d0caeSDavid Teigland if (!ls) 397597d0caeSDavid Teigland return -ENOENT; 398597d0caeSDavid Teigland 399254da030SPatrick Caulfield error = create_misc_device(ls, params->name); 400597d0caeSDavid Teigland dlm_put_lockspace(ls); 401597d0caeSDavid Teigland 402254da030SPatrick Caulfield if (error) 403597d0caeSDavid Teigland dlm_release_lockspace(lockspace, 0); 404254da030SPatrick Caulfield else 405254da030SPatrick Caulfield error = ls->ls_device.minor; 406254da030SPatrick Caulfield 407597d0caeSDavid Teigland return error; 408597d0caeSDavid Teigland } 409597d0caeSDavid Teigland 410597d0caeSDavid Teigland static int device_remove_lockspace(struct dlm_lspace_params *params) 411597d0caeSDavid Teigland { 412597d0caeSDavid Teigland dlm_lockspace_t *lockspace; 413597d0caeSDavid Teigland struct dlm_ls *ls; 414c6e6f0baSDavid Teigland int error, force = 0; 415597d0caeSDavid Teigland 416597d0caeSDavid Teigland if (!capable(CAP_SYS_ADMIN)) 417597d0caeSDavid Teigland return -EPERM; 418597d0caeSDavid Teigland 419597d0caeSDavid Teigland ls = dlm_find_lockspace_device(params->minor); 420597d0caeSDavid Teigland if (!ls) 421597d0caeSDavid Teigland return -ENOENT; 422597d0caeSDavid Teigland 423254da030SPatrick Caulfield /* Deregister the misc device first, so we don't have 424254da030SPatrick Caulfield * a device that's not attached to a lockspace. If 425254da030SPatrick Caulfield * dlm_release_lockspace fails then we can recreate it 426254da030SPatrick Caulfield */ 427597d0caeSDavid Teigland error = misc_deregister(&ls->ls_device); 428597d0caeSDavid Teigland if (error) { 429597d0caeSDavid Teigland dlm_put_lockspace(ls); 430597d0caeSDavid Teigland goto out; 431597d0caeSDavid Teigland } 432597d0caeSDavid Teigland kfree(ls->ls_device.name); 433597d0caeSDavid Teigland 434c6e6f0baSDavid Teigland if (params->flags & DLM_USER_LSFLG_FORCEFREE) 435c6e6f0baSDavid Teigland force = 2; 436c6e6f0baSDavid Teigland 437597d0caeSDavid Teigland lockspace = ls->ls_local_handle; 438597d0caeSDavid Teigland 439597d0caeSDavid Teigland /* dlm_release_lockspace waits for references to go to zero, 440597d0caeSDavid Teigland so all processes will need to close their device for the ls 441597d0caeSDavid Teigland before the release will procede */ 442597d0caeSDavid Teigland 443597d0caeSDavid Teigland dlm_put_lockspace(ls); 444c6e6f0baSDavid Teigland error = dlm_release_lockspace(lockspace, force); 445254da030SPatrick Caulfield if (error) 446254da030SPatrick Caulfield create_misc_device(ls, ls->ls_name); 447597d0caeSDavid Teigland out: 448597d0caeSDavid Teigland return error; 449597d0caeSDavid Teigland } 450597d0caeSDavid Teigland 451597d0caeSDavid Teigland /* Check the user's version matches ours */ 452597d0caeSDavid Teigland static int check_version(struct dlm_write_request *req) 453597d0caeSDavid Teigland { 454597d0caeSDavid Teigland if (req->version[0] != DLM_DEVICE_VERSION_MAJOR || 455597d0caeSDavid Teigland (req->version[0] == DLM_DEVICE_VERSION_MAJOR && 456597d0caeSDavid Teigland req->version[1] > DLM_DEVICE_VERSION_MINOR)) { 457597d0caeSDavid Teigland 458597d0caeSDavid Teigland printk(KERN_DEBUG "dlm: process %s (%d) version mismatch " 459597d0caeSDavid Teigland "user (%d.%d.%d) kernel (%d.%d.%d)\n", 460597d0caeSDavid Teigland current->comm, 461ba25f9dcSPavel Emelyanov task_pid_nr(current), 462597d0caeSDavid Teigland req->version[0], 463597d0caeSDavid Teigland req->version[1], 464597d0caeSDavid Teigland req->version[2], 465597d0caeSDavid Teigland DLM_DEVICE_VERSION_MAJOR, 466597d0caeSDavid Teigland DLM_DEVICE_VERSION_MINOR, 467597d0caeSDavid Teigland DLM_DEVICE_VERSION_PATCH); 468597d0caeSDavid Teigland return -EINVAL; 469597d0caeSDavid Teigland } 470597d0caeSDavid Teigland return 0; 471597d0caeSDavid Teigland } 472597d0caeSDavid Teigland 473597d0caeSDavid Teigland /* 474597d0caeSDavid Teigland * device_write 475597d0caeSDavid Teigland * 476597d0caeSDavid Teigland * device_user_lock 477597d0caeSDavid Teigland * dlm_user_request -> request_lock 478597d0caeSDavid Teigland * dlm_user_convert -> convert_lock 479597d0caeSDavid Teigland * 480597d0caeSDavid Teigland * device_user_unlock 481597d0caeSDavid Teigland * dlm_user_unlock -> unlock_lock 482597d0caeSDavid Teigland * dlm_user_cancel -> cancel_lock 483597d0caeSDavid Teigland * 484597d0caeSDavid Teigland * device_create_lockspace 485597d0caeSDavid Teigland * dlm_new_lockspace 486597d0caeSDavid Teigland * 487597d0caeSDavid Teigland * device_remove_lockspace 488597d0caeSDavid Teigland * dlm_release_lockspace 489597d0caeSDavid Teigland */ 490597d0caeSDavid Teigland 491597d0caeSDavid Teigland /* a write to a lockspace device is a lock or unlock request, a write 492597d0caeSDavid Teigland to the control device is to create/remove a lockspace */ 493597d0caeSDavid Teigland 494597d0caeSDavid Teigland static ssize_t device_write(struct file *file, const char __user *buf, 495597d0caeSDavid Teigland size_t count, loff_t *ppos) 496597d0caeSDavid Teigland { 497597d0caeSDavid Teigland struct dlm_user_proc *proc = file->private_data; 498597d0caeSDavid Teigland struct dlm_write_request *kbuf; 499597d0caeSDavid Teigland sigset_t tmpsig, allsigs; 500597d0caeSDavid Teigland int error; 501597d0caeSDavid Teigland 502597d0caeSDavid Teigland #ifdef CONFIG_COMPAT 503597d0caeSDavid Teigland if (count < sizeof(struct dlm_write_request32)) 504597d0caeSDavid Teigland #else 505597d0caeSDavid Teigland if (count < sizeof(struct dlm_write_request)) 506597d0caeSDavid Teigland #endif 507597d0caeSDavid Teigland return -EINVAL; 508597d0caeSDavid Teigland 509cb79f199SAl Viro kbuf = kzalloc(count + 1, GFP_KERNEL); 510597d0caeSDavid Teigland if (!kbuf) 511597d0caeSDavid Teigland return -ENOMEM; 512597d0caeSDavid Teigland 513597d0caeSDavid Teigland if (copy_from_user(kbuf, buf, count)) { 514597d0caeSDavid Teigland error = -EFAULT; 515597d0caeSDavid Teigland goto out_free; 516597d0caeSDavid Teigland } 517597d0caeSDavid Teigland 518597d0caeSDavid Teigland if (check_version(kbuf)) { 519597d0caeSDavid Teigland error = -EBADE; 520597d0caeSDavid Teigland goto out_free; 521597d0caeSDavid Teigland } 522597d0caeSDavid Teigland 523597d0caeSDavid Teigland #ifdef CONFIG_COMPAT 524597d0caeSDavid Teigland if (!kbuf->is64bit) { 525597d0caeSDavid Teigland struct dlm_write_request32 *k32buf; 526597d0caeSDavid Teigland k32buf = (struct dlm_write_request32 *)kbuf; 527cb79f199SAl Viro kbuf = kmalloc(count + 1 + (sizeof(struct dlm_write_request) - 528597d0caeSDavid Teigland sizeof(struct dlm_write_request32)), GFP_KERNEL); 529597d0caeSDavid Teigland if (!kbuf) 530597d0caeSDavid Teigland return -ENOMEM; 531597d0caeSDavid Teigland 532597d0caeSDavid Teigland if (proc) 533597d0caeSDavid Teigland set_bit(DLM_PROC_FLAGS_COMPAT, &proc->flags); 534cb79f199SAl Viro compat_input(kbuf, k32buf, count + 1); 535597d0caeSDavid Teigland kfree(k32buf); 536597d0caeSDavid Teigland } 537597d0caeSDavid Teigland #endif 538597d0caeSDavid Teigland 539597d0caeSDavid Teigland /* do we really need this? can a write happen after a close? */ 540597d0caeSDavid Teigland if ((kbuf->cmd == DLM_USER_LOCK || kbuf->cmd == DLM_USER_UNLOCK) && 541597d0caeSDavid Teigland test_bit(DLM_PROC_FLAGS_CLOSING, &proc->flags)) 542597d0caeSDavid Teigland return -EINVAL; 543597d0caeSDavid Teigland 544597d0caeSDavid Teigland sigfillset(&allsigs); 545597d0caeSDavid Teigland sigprocmask(SIG_BLOCK, &allsigs, &tmpsig); 546597d0caeSDavid Teigland 547597d0caeSDavid Teigland error = -EINVAL; 548597d0caeSDavid Teigland 549597d0caeSDavid Teigland switch (kbuf->cmd) 550597d0caeSDavid Teigland { 551597d0caeSDavid Teigland case DLM_USER_LOCK: 552597d0caeSDavid Teigland if (!proc) { 553597d0caeSDavid Teigland log_print("no locking on control device"); 554597d0caeSDavid Teigland goto out_sig; 555597d0caeSDavid Teigland } 556597d0caeSDavid Teigland error = device_user_lock(proc, &kbuf->i.lock); 557597d0caeSDavid Teigland break; 558597d0caeSDavid Teigland 559597d0caeSDavid Teigland case DLM_USER_UNLOCK: 560597d0caeSDavid Teigland if (!proc) { 561597d0caeSDavid Teigland log_print("no locking on control device"); 562597d0caeSDavid Teigland goto out_sig; 563597d0caeSDavid Teigland } 564597d0caeSDavid Teigland error = device_user_unlock(proc, &kbuf->i.lock); 565597d0caeSDavid Teigland break; 566597d0caeSDavid Teigland 5678b4021faSDavid Teigland case DLM_USER_DEADLOCK: 5688b4021faSDavid Teigland if (!proc) { 5698b4021faSDavid Teigland log_print("no locking on control device"); 5708b4021faSDavid Teigland goto out_sig; 5718b4021faSDavid Teigland } 5728b4021faSDavid Teigland error = device_user_deadlock(proc, &kbuf->i.lock); 5738b4021faSDavid Teigland break; 5748b4021faSDavid Teigland 575597d0caeSDavid Teigland case DLM_USER_CREATE_LOCKSPACE: 576597d0caeSDavid Teigland if (proc) { 577597d0caeSDavid Teigland log_print("create/remove only on control device"); 578597d0caeSDavid Teigland goto out_sig; 579597d0caeSDavid Teigland } 580597d0caeSDavid Teigland error = device_create_lockspace(&kbuf->i.lspace); 581597d0caeSDavid Teigland break; 582597d0caeSDavid Teigland 583597d0caeSDavid Teigland case DLM_USER_REMOVE_LOCKSPACE: 584597d0caeSDavid Teigland if (proc) { 585597d0caeSDavid Teigland log_print("create/remove only on control device"); 586597d0caeSDavid Teigland goto out_sig; 587597d0caeSDavid Teigland } 588597d0caeSDavid Teigland error = device_remove_lockspace(&kbuf->i.lspace); 589597d0caeSDavid Teigland break; 590597d0caeSDavid Teigland 59172c2be77SDavid Teigland case DLM_USER_PURGE: 59272c2be77SDavid Teigland if (!proc) { 59372c2be77SDavid Teigland log_print("no locking on control device"); 59472c2be77SDavid Teigland goto out_sig; 59572c2be77SDavid Teigland } 59672c2be77SDavid Teigland error = device_user_purge(proc, &kbuf->i.purge); 59772c2be77SDavid Teigland break; 59872c2be77SDavid Teigland 599597d0caeSDavid Teigland default: 600597d0caeSDavid Teigland log_print("Unknown command passed to DLM device : %d\n", 601597d0caeSDavid Teigland kbuf->cmd); 602597d0caeSDavid Teigland } 603597d0caeSDavid Teigland 604597d0caeSDavid Teigland out_sig: 605597d0caeSDavid Teigland sigprocmask(SIG_SETMASK, &tmpsig, NULL); 606597d0caeSDavid Teigland recalc_sigpending(); 607597d0caeSDavid Teigland out_free: 608597d0caeSDavid Teigland kfree(kbuf); 609597d0caeSDavid Teigland return error; 610597d0caeSDavid Teigland } 611597d0caeSDavid Teigland 612597d0caeSDavid Teigland /* Every process that opens the lockspace device has its own "proc" structure 613597d0caeSDavid Teigland hanging off the open file that's used to keep track of locks owned by the 614597d0caeSDavid Teigland process and asts that need to be delivered to the process. */ 615597d0caeSDavid Teigland 616597d0caeSDavid Teigland static int device_open(struct inode *inode, struct file *file) 617597d0caeSDavid Teigland { 618597d0caeSDavid Teigland struct dlm_user_proc *proc; 619597d0caeSDavid Teigland struct dlm_ls *ls; 620597d0caeSDavid Teigland 621597d0caeSDavid Teigland ls = dlm_find_lockspace_device(iminor(inode)); 622597d0caeSDavid Teigland if (!ls) 623597d0caeSDavid Teigland return -ENOENT; 624597d0caeSDavid Teigland 625597d0caeSDavid Teigland proc = kzalloc(sizeof(struct dlm_user_proc), GFP_KERNEL); 626597d0caeSDavid Teigland if (!proc) { 627597d0caeSDavid Teigland dlm_put_lockspace(ls); 628597d0caeSDavid Teigland return -ENOMEM; 629597d0caeSDavid Teigland } 630597d0caeSDavid Teigland 631597d0caeSDavid Teigland proc->lockspace = ls->ls_local_handle; 632597d0caeSDavid Teigland INIT_LIST_HEAD(&proc->asts); 633597d0caeSDavid Teigland INIT_LIST_HEAD(&proc->locks); 634a1bc86e6SDavid Teigland INIT_LIST_HEAD(&proc->unlocking); 635597d0caeSDavid Teigland spin_lock_init(&proc->asts_spin); 636597d0caeSDavid Teigland spin_lock_init(&proc->locks_spin); 637597d0caeSDavid Teigland init_waitqueue_head(&proc->wait); 638597d0caeSDavid Teigland file->private_data = proc; 639597d0caeSDavid Teigland 640597d0caeSDavid Teigland return 0; 641597d0caeSDavid Teigland } 642597d0caeSDavid Teigland 643597d0caeSDavid Teigland static int device_close(struct inode *inode, struct file *file) 644597d0caeSDavid Teigland { 645597d0caeSDavid Teigland struct dlm_user_proc *proc = file->private_data; 646597d0caeSDavid Teigland struct dlm_ls *ls; 647597d0caeSDavid Teigland sigset_t tmpsig, allsigs; 648597d0caeSDavid Teigland 649597d0caeSDavid Teigland ls = dlm_find_lockspace_local(proc->lockspace); 650597d0caeSDavid Teigland if (!ls) 651597d0caeSDavid Teigland return -ENOENT; 652597d0caeSDavid Teigland 653597d0caeSDavid Teigland sigfillset(&allsigs); 654597d0caeSDavid Teigland sigprocmask(SIG_BLOCK, &allsigs, &tmpsig); 655597d0caeSDavid Teigland 656597d0caeSDavid Teigland set_bit(DLM_PROC_FLAGS_CLOSING, &proc->flags); 657597d0caeSDavid Teigland 658597d0caeSDavid Teigland dlm_clear_proc_locks(ls, proc); 659597d0caeSDavid Teigland 660597d0caeSDavid Teigland /* at this point no more lkb's should exist for this lockspace, 661597d0caeSDavid Teigland so there's no chance of dlm_user_add_ast() being called and 662597d0caeSDavid Teigland looking for lkb->ua->proc */ 663597d0caeSDavid Teigland 664597d0caeSDavid Teigland kfree(proc); 665597d0caeSDavid Teigland file->private_data = NULL; 666597d0caeSDavid Teigland 667597d0caeSDavid Teigland dlm_put_lockspace(ls); 668597d0caeSDavid Teigland dlm_put_lockspace(ls); /* for the find in device_open() */ 669597d0caeSDavid Teigland 670597d0caeSDavid Teigland /* FIXME: AUTOFREE: if this ls is no longer used do 671597d0caeSDavid Teigland device_remove_lockspace() */ 672597d0caeSDavid Teigland 673597d0caeSDavid Teigland sigprocmask(SIG_SETMASK, &tmpsig, NULL); 674597d0caeSDavid Teigland recalc_sigpending(); 675597d0caeSDavid Teigland 676597d0caeSDavid Teigland return 0; 677597d0caeSDavid Teigland } 678597d0caeSDavid Teigland 679597d0caeSDavid Teigland static int copy_result_to_user(struct dlm_user_args *ua, int compat, int type, 680597d0caeSDavid Teigland int bmode, char __user *buf, size_t count) 681597d0caeSDavid Teigland { 682597d0caeSDavid Teigland #ifdef CONFIG_COMPAT 683597d0caeSDavid Teigland struct dlm_lock_result32 result32; 684597d0caeSDavid Teigland #endif 685597d0caeSDavid Teigland struct dlm_lock_result result; 686597d0caeSDavid Teigland void *resultptr; 687597d0caeSDavid Teigland int error=0; 688597d0caeSDavid Teigland int len; 689597d0caeSDavid Teigland int struct_len; 690597d0caeSDavid Teigland 691597d0caeSDavid Teigland memset(&result, 0, sizeof(struct dlm_lock_result)); 692d7db923eSDavid Teigland result.version[0] = DLM_DEVICE_VERSION_MAJOR; 693d7db923eSDavid Teigland result.version[1] = DLM_DEVICE_VERSION_MINOR; 694d7db923eSDavid Teigland result.version[2] = DLM_DEVICE_VERSION_PATCH; 695597d0caeSDavid Teigland memcpy(&result.lksb, &ua->lksb, sizeof(struct dlm_lksb)); 696597d0caeSDavid Teigland result.user_lksb = ua->user_lksb; 697597d0caeSDavid Teigland 698597d0caeSDavid Teigland /* FIXME: dlm1 provides for the user's bastparam/addr to not be updated 699597d0caeSDavid Teigland in a conversion unless the conversion is successful. See code 700597d0caeSDavid Teigland in dlm_user_convert() for updating ua from ua_tmp. OpenVMS, though, 701597d0caeSDavid Teigland notes that a new blocking AST address and parameter are set even if 702597d0caeSDavid Teigland the conversion fails, so maybe we should just do that. */ 703597d0caeSDavid Teigland 704597d0caeSDavid Teigland if (type == AST_BAST) { 705597d0caeSDavid Teigland result.user_astaddr = ua->bastaddr; 706597d0caeSDavid Teigland result.user_astparam = ua->bastparam; 707597d0caeSDavid Teigland result.bast_mode = bmode; 708597d0caeSDavid Teigland } else { 709597d0caeSDavid Teigland result.user_astaddr = ua->castaddr; 710597d0caeSDavid Teigland result.user_astparam = ua->castparam; 711597d0caeSDavid Teigland } 712597d0caeSDavid Teigland 713597d0caeSDavid Teigland #ifdef CONFIG_COMPAT 714597d0caeSDavid Teigland if (compat) 715597d0caeSDavid Teigland len = sizeof(struct dlm_lock_result32); 716597d0caeSDavid Teigland else 717597d0caeSDavid Teigland #endif 718597d0caeSDavid Teigland len = sizeof(struct dlm_lock_result); 719597d0caeSDavid Teigland struct_len = len; 720597d0caeSDavid Teigland 721597d0caeSDavid Teigland /* copy lvb to userspace if there is one, it's been updated, and 722597d0caeSDavid Teigland the user buffer has space for it */ 723597d0caeSDavid Teigland 724597d0caeSDavid Teigland if (ua->update_user_lvb && ua->lksb.sb_lvbptr && 725597d0caeSDavid Teigland count >= len + DLM_USER_LVB_LEN) { 726597d0caeSDavid Teigland if (copy_to_user(buf+len, ua->lksb.sb_lvbptr, 727597d0caeSDavid Teigland DLM_USER_LVB_LEN)) { 728597d0caeSDavid Teigland error = -EFAULT; 729597d0caeSDavid Teigland goto out; 730597d0caeSDavid Teigland } 731597d0caeSDavid Teigland 732597d0caeSDavid Teigland result.lvb_offset = len; 733597d0caeSDavid Teigland len += DLM_USER_LVB_LEN; 734597d0caeSDavid Teigland } 735597d0caeSDavid Teigland 736597d0caeSDavid Teigland result.length = len; 737597d0caeSDavid Teigland resultptr = &result; 738597d0caeSDavid Teigland #ifdef CONFIG_COMPAT 739597d0caeSDavid Teigland if (compat) { 740597d0caeSDavid Teigland compat_output(&result, &result32); 741597d0caeSDavid Teigland resultptr = &result32; 742597d0caeSDavid Teigland } 743597d0caeSDavid Teigland #endif 744597d0caeSDavid Teigland 745597d0caeSDavid Teigland if (copy_to_user(buf, resultptr, struct_len)) 746597d0caeSDavid Teigland error = -EFAULT; 747597d0caeSDavid Teigland else 748597d0caeSDavid Teigland error = len; 749597d0caeSDavid Teigland out: 750597d0caeSDavid Teigland return error; 751597d0caeSDavid Teigland } 752597d0caeSDavid Teigland 753d7db923eSDavid Teigland static int copy_version_to_user(char __user *buf, size_t count) 754d7db923eSDavid Teigland { 755d7db923eSDavid Teigland struct dlm_device_version ver; 756d7db923eSDavid Teigland 757d7db923eSDavid Teigland memset(&ver, 0, sizeof(struct dlm_device_version)); 758d7db923eSDavid Teigland ver.version[0] = DLM_DEVICE_VERSION_MAJOR; 759d7db923eSDavid Teigland ver.version[1] = DLM_DEVICE_VERSION_MINOR; 760d7db923eSDavid Teigland ver.version[2] = DLM_DEVICE_VERSION_PATCH; 761d7db923eSDavid Teigland 762d7db923eSDavid Teigland if (copy_to_user(buf, &ver, sizeof(struct dlm_device_version))) 763d7db923eSDavid Teigland return -EFAULT; 764d7db923eSDavid Teigland return sizeof(struct dlm_device_version); 765d7db923eSDavid Teigland } 766d7db923eSDavid Teigland 767597d0caeSDavid Teigland /* a read returns a single ast described in a struct dlm_lock_result */ 768597d0caeSDavid Teigland 769597d0caeSDavid Teigland static ssize_t device_read(struct file *file, char __user *buf, size_t count, 770597d0caeSDavid Teigland loff_t *ppos) 771597d0caeSDavid Teigland { 772597d0caeSDavid Teigland struct dlm_user_proc *proc = file->private_data; 773597d0caeSDavid Teigland struct dlm_lkb *lkb; 774597d0caeSDavid Teigland DECLARE_WAITQUEUE(wait, current); 775597d0caeSDavid Teigland int error, type=0, bmode=0, removed = 0; 776597d0caeSDavid Teigland 777d7db923eSDavid Teigland if (count == sizeof(struct dlm_device_version)) { 778d7db923eSDavid Teigland error = copy_version_to_user(buf, count); 779d7db923eSDavid Teigland return error; 780d7db923eSDavid Teigland } 781d7db923eSDavid Teigland 782d7db923eSDavid Teigland if (!proc) { 783d7db923eSDavid Teigland log_print("non-version read from control device %zu", count); 784d7db923eSDavid Teigland return -EINVAL; 785d7db923eSDavid Teigland } 786d7db923eSDavid Teigland 787597d0caeSDavid Teigland #ifdef CONFIG_COMPAT 788597d0caeSDavid Teigland if (count < sizeof(struct dlm_lock_result32)) 789597d0caeSDavid Teigland #else 790597d0caeSDavid Teigland if (count < sizeof(struct dlm_lock_result)) 791597d0caeSDavid Teigland #endif 792597d0caeSDavid Teigland return -EINVAL; 793597d0caeSDavid Teigland 794597d0caeSDavid Teigland /* do we really need this? can a read happen after a close? */ 795597d0caeSDavid Teigland if (test_bit(DLM_PROC_FLAGS_CLOSING, &proc->flags)) 796597d0caeSDavid Teigland return -EINVAL; 797597d0caeSDavid Teigland 798597d0caeSDavid Teigland spin_lock(&proc->asts_spin); 799597d0caeSDavid Teigland if (list_empty(&proc->asts)) { 800597d0caeSDavid Teigland if (file->f_flags & O_NONBLOCK) { 801597d0caeSDavid Teigland spin_unlock(&proc->asts_spin); 802597d0caeSDavid Teigland return -EAGAIN; 803597d0caeSDavid Teigland } 804597d0caeSDavid Teigland 805597d0caeSDavid Teigland add_wait_queue(&proc->wait, &wait); 806597d0caeSDavid Teigland 807597d0caeSDavid Teigland repeat: 808597d0caeSDavid Teigland set_current_state(TASK_INTERRUPTIBLE); 809597d0caeSDavid Teigland if (list_empty(&proc->asts) && !signal_pending(current)) { 810597d0caeSDavid Teigland spin_unlock(&proc->asts_spin); 811597d0caeSDavid Teigland schedule(); 812597d0caeSDavid Teigland spin_lock(&proc->asts_spin); 813597d0caeSDavid Teigland goto repeat; 814597d0caeSDavid Teigland } 815597d0caeSDavid Teigland set_current_state(TASK_RUNNING); 816597d0caeSDavid Teigland remove_wait_queue(&proc->wait, &wait); 817597d0caeSDavid Teigland 818597d0caeSDavid Teigland if (signal_pending(current)) { 819597d0caeSDavid Teigland spin_unlock(&proc->asts_spin); 820597d0caeSDavid Teigland return -ERESTARTSYS; 821597d0caeSDavid Teigland } 822597d0caeSDavid Teigland } 823597d0caeSDavid Teigland 824597d0caeSDavid Teigland /* there may be both completion and blocking asts to return for 825597d0caeSDavid Teigland the lkb, don't remove lkb from asts list unless no asts remain */ 826597d0caeSDavid Teigland 827597d0caeSDavid Teigland lkb = list_entry(proc->asts.next, struct dlm_lkb, lkb_astqueue); 828597d0caeSDavid Teigland 829597d0caeSDavid Teigland if (lkb->lkb_ast_type & AST_COMP) { 830597d0caeSDavid Teigland lkb->lkb_ast_type &= ~AST_COMP; 831597d0caeSDavid Teigland type = AST_COMP; 832597d0caeSDavid Teigland } else if (lkb->lkb_ast_type & AST_BAST) { 833597d0caeSDavid Teigland lkb->lkb_ast_type &= ~AST_BAST; 834597d0caeSDavid Teigland type = AST_BAST; 835597d0caeSDavid Teigland bmode = lkb->lkb_bastmode; 836597d0caeSDavid Teigland } 837597d0caeSDavid Teigland 838597d0caeSDavid Teigland if (!lkb->lkb_ast_type) { 839597d0caeSDavid Teigland list_del(&lkb->lkb_astqueue); 840597d0caeSDavid Teigland removed = 1; 841597d0caeSDavid Teigland } 842597d0caeSDavid Teigland spin_unlock(&proc->asts_spin); 843597d0caeSDavid Teigland 844d292c0ccSDavid Teigland error = copy_result_to_user(lkb->lkb_ua, 845597d0caeSDavid Teigland test_bit(DLM_PROC_FLAGS_COMPAT, &proc->flags), 846597d0caeSDavid Teigland type, bmode, buf, count); 847597d0caeSDavid Teigland 848597d0caeSDavid Teigland /* removes reference for the proc->asts lists added by 849597d0caeSDavid Teigland dlm_user_add_ast() and may result in the lkb being freed */ 850597d0caeSDavid Teigland if (removed) 851597d0caeSDavid Teigland dlm_put_lkb(lkb); 852597d0caeSDavid Teigland 853597d0caeSDavid Teigland return error; 854597d0caeSDavid Teigland } 855597d0caeSDavid Teigland 856597d0caeSDavid Teigland static unsigned int device_poll(struct file *file, poll_table *wait) 857597d0caeSDavid Teigland { 858597d0caeSDavid Teigland struct dlm_user_proc *proc = file->private_data; 859597d0caeSDavid Teigland 860597d0caeSDavid Teigland poll_wait(file, &proc->wait, wait); 861597d0caeSDavid Teigland 862597d0caeSDavid Teigland spin_lock(&proc->asts_spin); 863597d0caeSDavid Teigland if (!list_empty(&proc->asts)) { 864597d0caeSDavid Teigland spin_unlock(&proc->asts_spin); 865597d0caeSDavid Teigland return POLLIN | POLLRDNORM; 866597d0caeSDavid Teigland } 867597d0caeSDavid Teigland spin_unlock(&proc->asts_spin); 868597d0caeSDavid Teigland return 0; 869597d0caeSDavid Teigland } 870597d0caeSDavid Teigland 871597d0caeSDavid Teigland static int ctl_device_open(struct inode *inode, struct file *file) 872597d0caeSDavid Teigland { 873597d0caeSDavid Teigland file->private_data = NULL; 874597d0caeSDavid Teigland return 0; 875597d0caeSDavid Teigland } 876597d0caeSDavid Teigland 877597d0caeSDavid Teigland static int ctl_device_close(struct inode *inode, struct file *file) 878597d0caeSDavid Teigland { 879597d0caeSDavid Teigland return 0; 880597d0caeSDavid Teigland } 881597d0caeSDavid Teigland 88200977a59SArjan van de Ven static const struct file_operations device_fops = { 883597d0caeSDavid Teigland .open = device_open, 884597d0caeSDavid Teigland .release = device_close, 885597d0caeSDavid Teigland .read = device_read, 886597d0caeSDavid Teigland .write = device_write, 887597d0caeSDavid Teigland .poll = device_poll, 888597d0caeSDavid Teigland .owner = THIS_MODULE, 889597d0caeSDavid Teigland }; 890597d0caeSDavid Teigland 89100977a59SArjan van de Ven static const struct file_operations ctl_device_fops = { 892597d0caeSDavid Teigland .open = ctl_device_open, 893597d0caeSDavid Teigland .release = ctl_device_close, 894d7db923eSDavid Teigland .read = device_read, 895597d0caeSDavid Teigland .write = device_write, 896597d0caeSDavid Teigland .owner = THIS_MODULE, 897597d0caeSDavid Teigland }; 898597d0caeSDavid Teigland 8990fe410d3SDenis Cheng static struct miscdevice ctl_device = { 9000fe410d3SDenis Cheng .name = "dlm-control", 9010fe410d3SDenis Cheng .fops = &ctl_device_fops, 9020fe410d3SDenis Cheng .minor = MISC_DYNAMIC_MINOR, 9030fe410d3SDenis Cheng }; 9040fe410d3SDenis Cheng 905*30727174SDenis Cheng int __init dlm_user_init(void) 906597d0caeSDavid Teigland { 907597d0caeSDavid Teigland int error; 908597d0caeSDavid Teigland 909597d0caeSDavid Teigland error = misc_register(&ctl_device); 910597d0caeSDavid Teigland if (error) 911597d0caeSDavid Teigland log_print("misc_register failed for control device"); 912597d0caeSDavid Teigland 913597d0caeSDavid Teigland return error; 914597d0caeSDavid Teigland } 915597d0caeSDavid Teigland 916597d0caeSDavid Teigland void dlm_user_exit(void) 917597d0caeSDavid Teigland { 918597d0caeSDavid Teigland misc_deregister(&ctl_device); 919597d0caeSDavid Teigland } 920597d0caeSDavid Teigland 921