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 27597d0caeSDavid Teigland static const char *name_prefix="dlm"; 28597d0caeSDavid Teigland static struct miscdevice ctl_device; 2900977a59SArjan van de Ven static const struct file_operations device_fops; 30597d0caeSDavid Teigland 31597d0caeSDavid Teigland #ifdef CONFIG_COMPAT 32597d0caeSDavid Teigland 33597d0caeSDavid Teigland struct dlm_lock_params32 { 34597d0caeSDavid Teigland __u8 mode; 35597d0caeSDavid Teigland __u8 namelen; 36d7db923eSDavid Teigland __u16 unused; 37d7db923eSDavid Teigland __u32 flags; 38597d0caeSDavid Teigland __u32 lkid; 39597d0caeSDavid Teigland __u32 parent; 40d7db923eSDavid Teigland __u64 xid; 41d7db923eSDavid Teigland __u64 timeout; 42597d0caeSDavid Teigland __u32 castparam; 43597d0caeSDavid Teigland __u32 castaddr; 44597d0caeSDavid Teigland __u32 bastparam; 45597d0caeSDavid Teigland __u32 bastaddr; 46597d0caeSDavid Teigland __u32 lksb; 47597d0caeSDavid Teigland char lvb[DLM_USER_LVB_LEN]; 48597d0caeSDavid Teigland char name[0]; 49597d0caeSDavid Teigland }; 50597d0caeSDavid Teigland 51597d0caeSDavid Teigland struct dlm_write_request32 { 52597d0caeSDavid Teigland __u32 version[3]; 53597d0caeSDavid Teigland __u8 cmd; 54597d0caeSDavid Teigland __u8 is64bit; 55597d0caeSDavid Teigland __u8 unused[2]; 56597d0caeSDavid Teigland 57597d0caeSDavid Teigland union { 58597d0caeSDavid Teigland struct dlm_lock_params32 lock; 59597d0caeSDavid Teigland struct dlm_lspace_params lspace; 6072c2be77SDavid Teigland struct dlm_purge_params purge; 61597d0caeSDavid Teigland } i; 62597d0caeSDavid Teigland }; 63597d0caeSDavid Teigland 64597d0caeSDavid Teigland struct dlm_lksb32 { 65597d0caeSDavid Teigland __u32 sb_status; 66597d0caeSDavid Teigland __u32 sb_lkid; 67597d0caeSDavid Teigland __u8 sb_flags; 68597d0caeSDavid Teigland __u32 sb_lvbptr; 69597d0caeSDavid Teigland }; 70597d0caeSDavid Teigland 71597d0caeSDavid Teigland struct dlm_lock_result32 { 72d7db923eSDavid Teigland __u32 version[3]; 73597d0caeSDavid Teigland __u32 length; 74597d0caeSDavid Teigland __u32 user_astaddr; 75597d0caeSDavid Teigland __u32 user_astparam; 76597d0caeSDavid Teigland __u32 user_lksb; 77597d0caeSDavid Teigland struct dlm_lksb32 lksb; 78597d0caeSDavid Teigland __u8 bast_mode; 79597d0caeSDavid Teigland __u8 unused[3]; 80597d0caeSDavid Teigland /* Offsets may be zero if no data is present */ 81597d0caeSDavid Teigland __u32 lvb_offset; 82597d0caeSDavid Teigland }; 83597d0caeSDavid Teigland 84597d0caeSDavid Teigland static void compat_input(struct dlm_write_request *kb, 85597d0caeSDavid Teigland struct dlm_write_request32 *kb32) 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; 97597d0caeSDavid Teigland strcpy(kb->i.lspace.name, kb32->i.lspace.name); 9872c2be77SDavid Teigland } else if (kb->cmd == DLM_USER_PURGE) { 9972c2be77SDavid Teigland kb->i.purge.nodeid = kb32->i.purge.nodeid; 10072c2be77SDavid Teigland kb->i.purge.pid = kb32->i.purge.pid; 101597d0caeSDavid Teigland } else { 102597d0caeSDavid Teigland kb->i.lock.mode = kb32->i.lock.mode; 103597d0caeSDavid Teigland kb->i.lock.namelen = kb32->i.lock.namelen; 104597d0caeSDavid Teigland kb->i.lock.flags = kb32->i.lock.flags; 105597d0caeSDavid Teigland kb->i.lock.lkid = kb32->i.lock.lkid; 106597d0caeSDavid Teigland kb->i.lock.parent = kb32->i.lock.parent; 107d7db923eSDavid Teigland kb->i.lock.xid = kb32->i.lock.xid; 108d7db923eSDavid Teigland kb->i.lock.timeout = kb32->i.lock.timeout; 109597d0caeSDavid Teigland kb->i.lock.castparam = (void *)(long)kb32->i.lock.castparam; 110597d0caeSDavid Teigland kb->i.lock.castaddr = (void *)(long)kb32->i.lock.castaddr; 111597d0caeSDavid Teigland kb->i.lock.bastparam = (void *)(long)kb32->i.lock.bastparam; 112597d0caeSDavid Teigland kb->i.lock.bastaddr = (void *)(long)kb32->i.lock.bastaddr; 113597d0caeSDavid Teigland kb->i.lock.lksb = (void *)(long)kb32->i.lock.lksb; 114597d0caeSDavid Teigland memcpy(kb->i.lock.lvb, kb32->i.lock.lvb, DLM_USER_LVB_LEN); 115597d0caeSDavid Teigland memcpy(kb->i.lock.name, kb32->i.lock.name, kb->i.lock.namelen); 116597d0caeSDavid Teigland } 117597d0caeSDavid Teigland } 118597d0caeSDavid Teigland 119597d0caeSDavid Teigland static void compat_output(struct dlm_lock_result *res, 120597d0caeSDavid Teigland struct dlm_lock_result32 *res32) 121597d0caeSDavid Teigland { 122d7db923eSDavid Teigland res32->version[0] = res->version[0]; 123d7db923eSDavid Teigland res32->version[1] = res->version[1]; 124d7db923eSDavid Teigland res32->version[2] = res->version[2]; 125d7db923eSDavid Teigland 126597d0caeSDavid Teigland res32->user_astaddr = (__u32)(long)res->user_astaddr; 127597d0caeSDavid Teigland res32->user_astparam = (__u32)(long)res->user_astparam; 128597d0caeSDavid Teigland res32->user_lksb = (__u32)(long)res->user_lksb; 129597d0caeSDavid Teigland res32->bast_mode = res->bast_mode; 130597d0caeSDavid Teigland 131597d0caeSDavid Teigland res32->lvb_offset = res->lvb_offset; 132597d0caeSDavid Teigland res32->length = res->length; 133597d0caeSDavid Teigland 134597d0caeSDavid Teigland res32->lksb.sb_status = res->lksb.sb_status; 135597d0caeSDavid Teigland res32->lksb.sb_flags = res->lksb.sb_flags; 136597d0caeSDavid Teigland res32->lksb.sb_lkid = res->lksb.sb_lkid; 137597d0caeSDavid Teigland res32->lksb.sb_lvbptr = (__u32)(long)res->lksb.sb_lvbptr; 138597d0caeSDavid Teigland } 139597d0caeSDavid Teigland #endif 140597d0caeSDavid Teigland 14184d8cd69SDavid Teigland /* Figure out if this lock is at the end of its life and no longer 14284d8cd69SDavid Teigland available for the application to use. The lkb still exists until 14384d8cd69SDavid Teigland the final ast is read. A lock becomes EOL in three situations: 14484d8cd69SDavid Teigland 1. a noqueue request fails with EAGAIN 14584d8cd69SDavid Teigland 2. an unlock completes with EUNLOCK 14684d8cd69SDavid Teigland 3. a cancel of a waiting request completes with ECANCEL/EDEADLK 14784d8cd69SDavid Teigland An EOL lock needs to be removed from the process's list of locks. 14884d8cd69SDavid Teigland And we can't allow any new operation on an EOL lock. This is 14984d8cd69SDavid Teigland not related to the lifetime of the lkb struct which is managed 15084d8cd69SDavid Teigland entirely by refcount. */ 15184d8cd69SDavid Teigland 15284d8cd69SDavid Teigland static int lkb_is_endoflife(struct dlm_lkb *lkb, int sb_status, int type) 15384d8cd69SDavid Teigland { 15484d8cd69SDavid Teigland switch (sb_status) { 15584d8cd69SDavid Teigland case -DLM_EUNLOCK: 15684d8cd69SDavid Teigland return 1; 15784d8cd69SDavid Teigland case -DLM_ECANCEL: 15884d8cd69SDavid Teigland case -ETIMEDOUT: 1598b4021faSDavid Teigland case -EDEADLK: 16084d8cd69SDavid Teigland if (lkb->lkb_grmode == DLM_LOCK_IV) 16184d8cd69SDavid Teigland return 1; 16284d8cd69SDavid Teigland break; 16384d8cd69SDavid Teigland case -EAGAIN: 16484d8cd69SDavid Teigland if (type == AST_COMP && lkb->lkb_grmode == DLM_LOCK_IV) 16584d8cd69SDavid Teigland return 1; 16684d8cd69SDavid Teigland break; 16784d8cd69SDavid Teigland } 16884d8cd69SDavid Teigland return 0; 16984d8cd69SDavid Teigland } 17084d8cd69SDavid Teigland 171ef0c2bb0SDavid Teigland /* we could possibly check if the cancel of an orphan has resulted in the lkb 172ef0c2bb0SDavid Teigland being removed and then remove that lkb from the orphans list and free it */ 173597d0caeSDavid Teigland 174597d0caeSDavid Teigland void dlm_user_add_ast(struct dlm_lkb *lkb, int type) 175597d0caeSDavid Teigland { 176597d0caeSDavid Teigland struct dlm_ls *ls; 177597d0caeSDavid Teigland struct dlm_user_args *ua; 178597d0caeSDavid Teigland struct dlm_user_proc *proc; 179ef0c2bb0SDavid Teigland int eol = 0, ast_type; 180597d0caeSDavid Teigland 181ef0c2bb0SDavid Teigland if (lkb->lkb_flags & (DLM_IFL_ORPHAN | DLM_IFL_DEAD)) 182597d0caeSDavid Teigland return; 183597d0caeSDavid Teigland 184597d0caeSDavid Teigland ls = lkb->lkb_resource->res_ls; 185597d0caeSDavid Teigland mutex_lock(&ls->ls_clear_proc_locks); 186597d0caeSDavid Teigland 187597d0caeSDavid Teigland /* If ORPHAN/DEAD flag is set, it means the process is dead so an ast 188597d0caeSDavid Teigland can't be delivered. For ORPHAN's, dlm_clear_proc_locks() freed 189ef0c2bb0SDavid Teigland lkb->ua so we can't try to use it. This second check is necessary 190ef0c2bb0SDavid Teigland for cases where a completion ast is received for an operation that 191ef0c2bb0SDavid Teigland began before clear_proc_locks did its cancel/unlock. */ 192597d0caeSDavid Teigland 193ef0c2bb0SDavid Teigland if (lkb->lkb_flags & (DLM_IFL_ORPHAN | DLM_IFL_DEAD)) 194597d0caeSDavid Teigland goto out; 195597d0caeSDavid Teigland 196597d0caeSDavid Teigland DLM_ASSERT(lkb->lkb_astparam, dlm_print_lkb(lkb);); 197597d0caeSDavid Teigland ua = (struct dlm_user_args *)lkb->lkb_astparam; 198597d0caeSDavid Teigland proc = ua->proc; 199597d0caeSDavid Teigland 200597d0caeSDavid Teigland if (type == AST_BAST && ua->bastaddr == NULL) 201597d0caeSDavid Teigland goto out; 202597d0caeSDavid Teigland 203597d0caeSDavid Teigland spin_lock(&proc->asts_spin); 204ef0c2bb0SDavid Teigland 205ef0c2bb0SDavid Teigland ast_type = lkb->lkb_ast_type; 206ef0c2bb0SDavid Teigland lkb->lkb_ast_type |= type; 207ef0c2bb0SDavid Teigland 208ef0c2bb0SDavid Teigland if (!ast_type) { 209597d0caeSDavid Teigland kref_get(&lkb->lkb_ref); 210597d0caeSDavid Teigland list_add_tail(&lkb->lkb_astqueue, &proc->asts); 211597d0caeSDavid Teigland wake_up_interruptible(&proc->wait); 212597d0caeSDavid Teigland } 213ef0c2bb0SDavid Teigland if (type == AST_COMP && (ast_type & AST_COMP)) 214ef0c2bb0SDavid Teigland log_debug(ls, "ast overlap %x status %x %x", 215ef0c2bb0SDavid Teigland lkb->lkb_id, ua->lksb.sb_status, lkb->lkb_flags); 216597d0caeSDavid Teigland 21784d8cd69SDavid Teigland eol = lkb_is_endoflife(lkb, ua->lksb.sb_status, type); 218ef0c2bb0SDavid Teigland if (eol) { 219ef0c2bb0SDavid Teigland lkb->lkb_ast_type &= ~AST_BAST; 220ef0c2bb0SDavid Teigland lkb->lkb_flags |= DLM_IFL_ENDOFLIFE; 221ef0c2bb0SDavid Teigland } 222a1bc86e6SDavid Teigland 223597d0caeSDavid Teigland /* We want to copy the lvb to userspace when the completion 224597d0caeSDavid Teigland ast is read if the status is 0, the lock has an lvb and 225597d0caeSDavid Teigland lvb_ops says we should. We could probably have set_lvb_lock() 226597d0caeSDavid Teigland set update_user_lvb instead and not need old_mode */ 227597d0caeSDavid Teigland 228597d0caeSDavid Teigland if ((lkb->lkb_ast_type & AST_COMP) && 229597d0caeSDavid Teigland (lkb->lkb_lksb->sb_status == 0) && 230597d0caeSDavid Teigland lkb->lkb_lksb->sb_lvbptr && 231597d0caeSDavid Teigland dlm_lvb_operations[ua->old_mode + 1][lkb->lkb_grmode + 1]) 232597d0caeSDavid Teigland ua->update_user_lvb = 1; 233597d0caeSDavid Teigland else 234597d0caeSDavid Teigland ua->update_user_lvb = 0; 235597d0caeSDavid Teigland 236597d0caeSDavid Teigland spin_unlock(&proc->asts_spin); 23734e22bedSDavid Teigland 238ef0c2bb0SDavid Teigland if (eol) { 23934e22bedSDavid Teigland spin_lock(&ua->proc->locks_spin); 240ef0c2bb0SDavid Teigland if (!list_empty(&lkb->lkb_ownqueue)) { 24134e22bedSDavid Teigland list_del_init(&lkb->lkb_ownqueue); 24234e22bedSDavid Teigland dlm_put_lkb(lkb); 24334e22bedSDavid Teigland } 244ef0c2bb0SDavid Teigland spin_unlock(&ua->proc->locks_spin); 245ef0c2bb0SDavid Teigland } 246597d0caeSDavid Teigland out: 247597d0caeSDavid Teigland mutex_unlock(&ls->ls_clear_proc_locks); 248597d0caeSDavid Teigland } 249597d0caeSDavid Teigland 250597d0caeSDavid Teigland static int device_user_lock(struct dlm_user_proc *proc, 251597d0caeSDavid Teigland struct dlm_lock_params *params) 252597d0caeSDavid Teigland { 253597d0caeSDavid Teigland struct dlm_ls *ls; 254597d0caeSDavid Teigland struct dlm_user_args *ua; 255597d0caeSDavid Teigland int error = -ENOMEM; 256597d0caeSDavid Teigland 257597d0caeSDavid Teigland ls = dlm_find_lockspace_local(proc->lockspace); 258597d0caeSDavid Teigland if (!ls) 259597d0caeSDavid Teigland return -ENOENT; 260597d0caeSDavid Teigland 261597d0caeSDavid Teigland if (!params->castaddr || !params->lksb) { 262597d0caeSDavid Teigland error = -EINVAL; 263597d0caeSDavid Teigland goto out; 264597d0caeSDavid Teigland } 265597d0caeSDavid Teigland 266597d0caeSDavid Teigland ua = kzalloc(sizeof(struct dlm_user_args), GFP_KERNEL); 267597d0caeSDavid Teigland if (!ua) 268597d0caeSDavid Teigland goto out; 269597d0caeSDavid Teigland ua->proc = proc; 270597d0caeSDavid Teigland ua->user_lksb = params->lksb; 271597d0caeSDavid Teigland ua->castparam = params->castparam; 272597d0caeSDavid Teigland ua->castaddr = params->castaddr; 273597d0caeSDavid Teigland ua->bastparam = params->bastparam; 274597d0caeSDavid Teigland ua->bastaddr = params->bastaddr; 275d7db923eSDavid Teigland ua->xid = params->xid; 276597d0caeSDavid Teigland 277597d0caeSDavid Teigland if (params->flags & DLM_LKF_CONVERT) 278597d0caeSDavid Teigland error = dlm_user_convert(ls, ua, 279597d0caeSDavid Teigland params->mode, params->flags, 280d7db923eSDavid Teigland params->lkid, params->lvb, 281d7db923eSDavid Teigland (unsigned long) params->timeout); 282597d0caeSDavid Teigland else { 283597d0caeSDavid Teigland error = dlm_user_request(ls, ua, 284597d0caeSDavid Teigland params->mode, params->flags, 285597d0caeSDavid Teigland params->name, params->namelen, 286d7db923eSDavid Teigland (unsigned long) params->timeout); 287597d0caeSDavid Teigland if (!error) 288597d0caeSDavid Teigland error = ua->lksb.sb_lkid; 289597d0caeSDavid Teigland } 290597d0caeSDavid Teigland out: 291597d0caeSDavid Teigland dlm_put_lockspace(ls); 292597d0caeSDavid Teigland return error; 293597d0caeSDavid Teigland } 294597d0caeSDavid Teigland 295597d0caeSDavid Teigland static int device_user_unlock(struct dlm_user_proc *proc, 296597d0caeSDavid Teigland struct dlm_lock_params *params) 297597d0caeSDavid Teigland { 298597d0caeSDavid Teigland struct dlm_ls *ls; 299597d0caeSDavid Teigland struct dlm_user_args *ua; 300597d0caeSDavid Teigland int error = -ENOMEM; 301597d0caeSDavid Teigland 302597d0caeSDavid Teigland ls = dlm_find_lockspace_local(proc->lockspace); 303597d0caeSDavid Teigland if (!ls) 304597d0caeSDavid Teigland return -ENOENT; 305597d0caeSDavid Teigland 306597d0caeSDavid Teigland ua = kzalloc(sizeof(struct dlm_user_args), GFP_KERNEL); 307597d0caeSDavid Teigland if (!ua) 308597d0caeSDavid Teigland goto out; 309597d0caeSDavid Teigland ua->proc = proc; 310597d0caeSDavid Teigland ua->user_lksb = params->lksb; 311597d0caeSDavid Teigland ua->castparam = params->castparam; 312597d0caeSDavid Teigland ua->castaddr = params->castaddr; 313597d0caeSDavid Teigland 314597d0caeSDavid Teigland if (params->flags & DLM_LKF_CANCEL) 315597d0caeSDavid Teigland error = dlm_user_cancel(ls, ua, params->flags, params->lkid); 316597d0caeSDavid Teigland else 317597d0caeSDavid Teigland error = dlm_user_unlock(ls, ua, params->flags, params->lkid, 318597d0caeSDavid Teigland params->lvb); 319597d0caeSDavid Teigland out: 320597d0caeSDavid Teigland dlm_put_lockspace(ls); 321597d0caeSDavid Teigland return error; 322597d0caeSDavid Teigland } 323597d0caeSDavid Teigland 3248b4021faSDavid Teigland static int device_user_deadlock(struct dlm_user_proc *proc, 3258b4021faSDavid Teigland struct dlm_lock_params *params) 3268b4021faSDavid Teigland { 3278b4021faSDavid Teigland struct dlm_ls *ls; 3288b4021faSDavid Teigland int error; 3298b4021faSDavid Teigland 3308b4021faSDavid Teigland ls = dlm_find_lockspace_local(proc->lockspace); 3318b4021faSDavid Teigland if (!ls) 3328b4021faSDavid Teigland return -ENOENT; 3338b4021faSDavid Teigland 3348b4021faSDavid Teigland error = dlm_user_deadlock(ls, params->flags, params->lkid); 3358b4021faSDavid Teigland 3368b4021faSDavid Teigland dlm_put_lockspace(ls); 3378b4021faSDavid Teigland return error; 3388b4021faSDavid Teigland } 3398b4021faSDavid Teigland 340254da030SPatrick Caulfield static int create_misc_device(struct dlm_ls *ls, char *name) 341254da030SPatrick Caulfield { 342254da030SPatrick Caulfield int error, len; 343254da030SPatrick Caulfield 344254da030SPatrick Caulfield error = -ENOMEM; 345254da030SPatrick Caulfield len = strlen(name) + strlen(name_prefix) + 2; 346254da030SPatrick Caulfield ls->ls_device.name = kzalloc(len, GFP_KERNEL); 347254da030SPatrick Caulfield if (!ls->ls_device.name) 348254da030SPatrick Caulfield goto fail; 349254da030SPatrick Caulfield 350254da030SPatrick Caulfield snprintf((char *)ls->ls_device.name, len, "%s_%s", name_prefix, 351254da030SPatrick Caulfield name); 352254da030SPatrick Caulfield ls->ls_device.fops = &device_fops; 353254da030SPatrick Caulfield ls->ls_device.minor = MISC_DYNAMIC_MINOR; 354254da030SPatrick Caulfield 355254da030SPatrick Caulfield error = misc_register(&ls->ls_device); 356254da030SPatrick Caulfield if (error) { 357254da030SPatrick Caulfield kfree(ls->ls_device.name); 358254da030SPatrick Caulfield } 359254da030SPatrick Caulfield fail: 360254da030SPatrick Caulfield return error; 361254da030SPatrick Caulfield } 362254da030SPatrick Caulfield 36372c2be77SDavid Teigland static int device_user_purge(struct dlm_user_proc *proc, 36472c2be77SDavid Teigland struct dlm_purge_params *params) 36572c2be77SDavid Teigland { 36672c2be77SDavid Teigland struct dlm_ls *ls; 36772c2be77SDavid Teigland int error; 36872c2be77SDavid Teigland 36972c2be77SDavid Teigland ls = dlm_find_lockspace_local(proc->lockspace); 37072c2be77SDavid Teigland if (!ls) 37172c2be77SDavid Teigland return -ENOENT; 37272c2be77SDavid Teigland 37372c2be77SDavid Teigland error = dlm_user_purge(ls, proc, params->nodeid, params->pid); 37472c2be77SDavid Teigland 37572c2be77SDavid Teigland dlm_put_lockspace(ls); 37672c2be77SDavid Teigland return error; 37772c2be77SDavid Teigland } 37872c2be77SDavid Teigland 379597d0caeSDavid Teigland static int device_create_lockspace(struct dlm_lspace_params *params) 380597d0caeSDavid Teigland { 381597d0caeSDavid Teigland dlm_lockspace_t *lockspace; 382597d0caeSDavid Teigland struct dlm_ls *ls; 383254da030SPatrick Caulfield int error; 384597d0caeSDavid Teigland 385597d0caeSDavid Teigland if (!capable(CAP_SYS_ADMIN)) 386597d0caeSDavid Teigland return -EPERM; 387597d0caeSDavid Teigland 388597d0caeSDavid Teigland error = dlm_new_lockspace(params->name, strlen(params->name), 3893ae1acf9SDavid Teigland &lockspace, params->flags, DLM_USER_LVB_LEN); 390597d0caeSDavid Teigland if (error) 391597d0caeSDavid Teigland return error; 392597d0caeSDavid Teigland 393597d0caeSDavid Teigland ls = dlm_find_lockspace_local(lockspace); 394597d0caeSDavid Teigland if (!ls) 395597d0caeSDavid Teigland return -ENOENT; 396597d0caeSDavid Teigland 397254da030SPatrick Caulfield error = create_misc_device(ls, params->name); 398597d0caeSDavid Teigland dlm_put_lockspace(ls); 399597d0caeSDavid Teigland 400254da030SPatrick Caulfield if (error) 401597d0caeSDavid Teigland dlm_release_lockspace(lockspace, 0); 402254da030SPatrick Caulfield else 403254da030SPatrick Caulfield error = ls->ls_device.minor; 404254da030SPatrick Caulfield 405597d0caeSDavid Teigland return error; 406597d0caeSDavid Teigland } 407597d0caeSDavid Teigland 408597d0caeSDavid Teigland static int device_remove_lockspace(struct dlm_lspace_params *params) 409597d0caeSDavid Teigland { 410597d0caeSDavid Teigland dlm_lockspace_t *lockspace; 411597d0caeSDavid Teigland struct dlm_ls *ls; 412c6e6f0baSDavid Teigland int error, force = 0; 413597d0caeSDavid Teigland 414597d0caeSDavid Teigland if (!capable(CAP_SYS_ADMIN)) 415597d0caeSDavid Teigland return -EPERM; 416597d0caeSDavid Teigland 417597d0caeSDavid Teigland ls = dlm_find_lockspace_device(params->minor); 418597d0caeSDavid Teigland if (!ls) 419597d0caeSDavid Teigland return -ENOENT; 420597d0caeSDavid Teigland 421254da030SPatrick Caulfield /* Deregister the misc device first, so we don't have 422254da030SPatrick Caulfield * a device that's not attached to a lockspace. If 423254da030SPatrick Caulfield * dlm_release_lockspace fails then we can recreate it 424254da030SPatrick Caulfield */ 425597d0caeSDavid Teigland error = misc_deregister(&ls->ls_device); 426597d0caeSDavid Teigland if (error) { 427597d0caeSDavid Teigland dlm_put_lockspace(ls); 428597d0caeSDavid Teigland goto out; 429597d0caeSDavid Teigland } 430597d0caeSDavid Teigland kfree(ls->ls_device.name); 431597d0caeSDavid Teigland 432c6e6f0baSDavid Teigland if (params->flags & DLM_USER_LSFLG_FORCEFREE) 433c6e6f0baSDavid Teigland force = 2; 434c6e6f0baSDavid Teigland 435597d0caeSDavid Teigland lockspace = ls->ls_local_handle; 436597d0caeSDavid Teigland 437597d0caeSDavid Teigland /* dlm_release_lockspace waits for references to go to zero, 438597d0caeSDavid Teigland so all processes will need to close their device for the ls 439597d0caeSDavid Teigland before the release will procede */ 440597d0caeSDavid Teigland 441597d0caeSDavid Teigland dlm_put_lockspace(ls); 442c6e6f0baSDavid Teigland error = dlm_release_lockspace(lockspace, force); 443254da030SPatrick Caulfield if (error) 444254da030SPatrick Caulfield create_misc_device(ls, ls->ls_name); 445597d0caeSDavid Teigland out: 446597d0caeSDavid Teigland return error; 447597d0caeSDavid Teigland } 448597d0caeSDavid Teigland 449597d0caeSDavid Teigland /* Check the user's version matches ours */ 450597d0caeSDavid Teigland static int check_version(struct dlm_write_request *req) 451597d0caeSDavid Teigland { 452597d0caeSDavid Teigland if (req->version[0] != DLM_DEVICE_VERSION_MAJOR || 453597d0caeSDavid Teigland (req->version[0] == DLM_DEVICE_VERSION_MAJOR && 454597d0caeSDavid Teigland req->version[1] > DLM_DEVICE_VERSION_MINOR)) { 455597d0caeSDavid Teigland 456597d0caeSDavid Teigland printk(KERN_DEBUG "dlm: process %s (%d) version mismatch " 457597d0caeSDavid Teigland "user (%d.%d.%d) kernel (%d.%d.%d)\n", 458597d0caeSDavid Teigland current->comm, 459*ba25f9dcSPavel Emelyanov task_pid_nr(current), 460597d0caeSDavid Teigland req->version[0], 461597d0caeSDavid Teigland req->version[1], 462597d0caeSDavid Teigland req->version[2], 463597d0caeSDavid Teigland DLM_DEVICE_VERSION_MAJOR, 464597d0caeSDavid Teigland DLM_DEVICE_VERSION_MINOR, 465597d0caeSDavid Teigland DLM_DEVICE_VERSION_PATCH); 466597d0caeSDavid Teigland return -EINVAL; 467597d0caeSDavid Teigland } 468597d0caeSDavid Teigland return 0; 469597d0caeSDavid Teigland } 470597d0caeSDavid Teigland 471597d0caeSDavid Teigland /* 472597d0caeSDavid Teigland * device_write 473597d0caeSDavid Teigland * 474597d0caeSDavid Teigland * device_user_lock 475597d0caeSDavid Teigland * dlm_user_request -> request_lock 476597d0caeSDavid Teigland * dlm_user_convert -> convert_lock 477597d0caeSDavid Teigland * 478597d0caeSDavid Teigland * device_user_unlock 479597d0caeSDavid Teigland * dlm_user_unlock -> unlock_lock 480597d0caeSDavid Teigland * dlm_user_cancel -> cancel_lock 481597d0caeSDavid Teigland * 482597d0caeSDavid Teigland * device_create_lockspace 483597d0caeSDavid Teigland * dlm_new_lockspace 484597d0caeSDavid Teigland * 485597d0caeSDavid Teigland * device_remove_lockspace 486597d0caeSDavid Teigland * dlm_release_lockspace 487597d0caeSDavid Teigland */ 488597d0caeSDavid Teigland 489597d0caeSDavid Teigland /* a write to a lockspace device is a lock or unlock request, a write 490597d0caeSDavid Teigland to the control device is to create/remove a lockspace */ 491597d0caeSDavid Teigland 492597d0caeSDavid Teigland static ssize_t device_write(struct file *file, const char __user *buf, 493597d0caeSDavid Teigland size_t count, loff_t *ppos) 494597d0caeSDavid Teigland { 495597d0caeSDavid Teigland struct dlm_user_proc *proc = file->private_data; 496597d0caeSDavid Teigland struct dlm_write_request *kbuf; 497597d0caeSDavid Teigland sigset_t tmpsig, allsigs; 498597d0caeSDavid Teigland int error; 499597d0caeSDavid Teigland 500597d0caeSDavid Teigland #ifdef CONFIG_COMPAT 501597d0caeSDavid Teigland if (count < sizeof(struct dlm_write_request32)) 502597d0caeSDavid Teigland #else 503597d0caeSDavid Teigland if (count < sizeof(struct dlm_write_request)) 504597d0caeSDavid Teigland #endif 505597d0caeSDavid Teigland return -EINVAL; 506597d0caeSDavid Teigland 507597d0caeSDavid Teigland kbuf = kmalloc(count, GFP_KERNEL); 508597d0caeSDavid Teigland if (!kbuf) 509597d0caeSDavid Teigland return -ENOMEM; 510597d0caeSDavid Teigland 511597d0caeSDavid Teigland if (copy_from_user(kbuf, buf, count)) { 512597d0caeSDavid Teigland error = -EFAULT; 513597d0caeSDavid Teigland goto out_free; 514597d0caeSDavid Teigland } 515597d0caeSDavid Teigland 516597d0caeSDavid Teigland if (check_version(kbuf)) { 517597d0caeSDavid Teigland error = -EBADE; 518597d0caeSDavid Teigland goto out_free; 519597d0caeSDavid Teigland } 520597d0caeSDavid Teigland 521597d0caeSDavid Teigland #ifdef CONFIG_COMPAT 522597d0caeSDavid Teigland if (!kbuf->is64bit) { 523597d0caeSDavid Teigland struct dlm_write_request32 *k32buf; 524597d0caeSDavid Teigland k32buf = (struct dlm_write_request32 *)kbuf; 525597d0caeSDavid Teigland kbuf = kmalloc(count + (sizeof(struct dlm_write_request) - 526597d0caeSDavid Teigland sizeof(struct dlm_write_request32)), GFP_KERNEL); 527597d0caeSDavid Teigland if (!kbuf) 528597d0caeSDavid Teigland return -ENOMEM; 529597d0caeSDavid Teigland 530597d0caeSDavid Teigland if (proc) 531597d0caeSDavid Teigland set_bit(DLM_PROC_FLAGS_COMPAT, &proc->flags); 532597d0caeSDavid Teigland compat_input(kbuf, k32buf); 533597d0caeSDavid Teigland kfree(k32buf); 534597d0caeSDavid Teigland } 535597d0caeSDavid Teigland #endif 536597d0caeSDavid Teigland 537597d0caeSDavid Teigland /* do we really need this? can a write happen after a close? */ 538597d0caeSDavid Teigland if ((kbuf->cmd == DLM_USER_LOCK || kbuf->cmd == DLM_USER_UNLOCK) && 539597d0caeSDavid Teigland test_bit(DLM_PROC_FLAGS_CLOSING, &proc->flags)) 540597d0caeSDavid Teigland return -EINVAL; 541597d0caeSDavid Teigland 542597d0caeSDavid Teigland sigfillset(&allsigs); 543597d0caeSDavid Teigland sigprocmask(SIG_BLOCK, &allsigs, &tmpsig); 544597d0caeSDavid Teigland 545597d0caeSDavid Teigland error = -EINVAL; 546597d0caeSDavid Teigland 547597d0caeSDavid Teigland switch (kbuf->cmd) 548597d0caeSDavid Teigland { 549597d0caeSDavid Teigland case DLM_USER_LOCK: 550597d0caeSDavid Teigland if (!proc) { 551597d0caeSDavid Teigland log_print("no locking on control device"); 552597d0caeSDavid Teigland goto out_sig; 553597d0caeSDavid Teigland } 554597d0caeSDavid Teigland error = device_user_lock(proc, &kbuf->i.lock); 555597d0caeSDavid Teigland break; 556597d0caeSDavid Teigland 557597d0caeSDavid Teigland case DLM_USER_UNLOCK: 558597d0caeSDavid Teigland if (!proc) { 559597d0caeSDavid Teigland log_print("no locking on control device"); 560597d0caeSDavid Teigland goto out_sig; 561597d0caeSDavid Teigland } 562597d0caeSDavid Teigland error = device_user_unlock(proc, &kbuf->i.lock); 563597d0caeSDavid Teigland break; 564597d0caeSDavid Teigland 5658b4021faSDavid Teigland case DLM_USER_DEADLOCK: 5668b4021faSDavid Teigland if (!proc) { 5678b4021faSDavid Teigland log_print("no locking on control device"); 5688b4021faSDavid Teigland goto out_sig; 5698b4021faSDavid Teigland } 5708b4021faSDavid Teigland error = device_user_deadlock(proc, &kbuf->i.lock); 5718b4021faSDavid Teigland break; 5728b4021faSDavid Teigland 573597d0caeSDavid Teigland case DLM_USER_CREATE_LOCKSPACE: 574597d0caeSDavid Teigland if (proc) { 575597d0caeSDavid Teigland log_print("create/remove only on control device"); 576597d0caeSDavid Teigland goto out_sig; 577597d0caeSDavid Teigland } 578597d0caeSDavid Teigland error = device_create_lockspace(&kbuf->i.lspace); 579597d0caeSDavid Teigland break; 580597d0caeSDavid Teigland 581597d0caeSDavid Teigland case DLM_USER_REMOVE_LOCKSPACE: 582597d0caeSDavid Teigland if (proc) { 583597d0caeSDavid Teigland log_print("create/remove only on control device"); 584597d0caeSDavid Teigland goto out_sig; 585597d0caeSDavid Teigland } 586597d0caeSDavid Teigland error = device_remove_lockspace(&kbuf->i.lspace); 587597d0caeSDavid Teigland break; 588597d0caeSDavid Teigland 58972c2be77SDavid Teigland case DLM_USER_PURGE: 59072c2be77SDavid Teigland if (!proc) { 59172c2be77SDavid Teigland log_print("no locking on control device"); 59272c2be77SDavid Teigland goto out_sig; 59372c2be77SDavid Teigland } 59472c2be77SDavid Teigland error = device_user_purge(proc, &kbuf->i.purge); 59572c2be77SDavid Teigland break; 59672c2be77SDavid Teigland 597597d0caeSDavid Teigland default: 598597d0caeSDavid Teigland log_print("Unknown command passed to DLM device : %d\n", 599597d0caeSDavid Teigland kbuf->cmd); 600597d0caeSDavid Teigland } 601597d0caeSDavid Teigland 602597d0caeSDavid Teigland out_sig: 603597d0caeSDavid Teigland sigprocmask(SIG_SETMASK, &tmpsig, NULL); 604597d0caeSDavid Teigland recalc_sigpending(); 605597d0caeSDavid Teigland out_free: 606597d0caeSDavid Teigland kfree(kbuf); 607597d0caeSDavid Teigland return error; 608597d0caeSDavid Teigland } 609597d0caeSDavid Teigland 610597d0caeSDavid Teigland /* Every process that opens the lockspace device has its own "proc" structure 611597d0caeSDavid Teigland hanging off the open file that's used to keep track of locks owned by the 612597d0caeSDavid Teigland process and asts that need to be delivered to the process. */ 613597d0caeSDavid Teigland 614597d0caeSDavid Teigland static int device_open(struct inode *inode, struct file *file) 615597d0caeSDavid Teigland { 616597d0caeSDavid Teigland struct dlm_user_proc *proc; 617597d0caeSDavid Teigland struct dlm_ls *ls; 618597d0caeSDavid Teigland 619597d0caeSDavid Teigland ls = dlm_find_lockspace_device(iminor(inode)); 620597d0caeSDavid Teigland if (!ls) 621597d0caeSDavid Teigland return -ENOENT; 622597d0caeSDavid Teigland 623597d0caeSDavid Teigland proc = kzalloc(sizeof(struct dlm_user_proc), GFP_KERNEL); 624597d0caeSDavid Teigland if (!proc) { 625597d0caeSDavid Teigland dlm_put_lockspace(ls); 626597d0caeSDavid Teigland return -ENOMEM; 627597d0caeSDavid Teigland } 628597d0caeSDavid Teigland 629597d0caeSDavid Teigland proc->lockspace = ls->ls_local_handle; 630597d0caeSDavid Teigland INIT_LIST_HEAD(&proc->asts); 631597d0caeSDavid Teigland INIT_LIST_HEAD(&proc->locks); 632a1bc86e6SDavid Teigland INIT_LIST_HEAD(&proc->unlocking); 633597d0caeSDavid Teigland spin_lock_init(&proc->asts_spin); 634597d0caeSDavid Teigland spin_lock_init(&proc->locks_spin); 635597d0caeSDavid Teigland init_waitqueue_head(&proc->wait); 636597d0caeSDavid Teigland file->private_data = proc; 637597d0caeSDavid Teigland 638597d0caeSDavid Teigland return 0; 639597d0caeSDavid Teigland } 640597d0caeSDavid Teigland 641597d0caeSDavid Teigland static int device_close(struct inode *inode, struct file *file) 642597d0caeSDavid Teigland { 643597d0caeSDavid Teigland struct dlm_user_proc *proc = file->private_data; 644597d0caeSDavid Teigland struct dlm_ls *ls; 645597d0caeSDavid Teigland sigset_t tmpsig, allsigs; 646597d0caeSDavid Teigland 647597d0caeSDavid Teigland ls = dlm_find_lockspace_local(proc->lockspace); 648597d0caeSDavid Teigland if (!ls) 649597d0caeSDavid Teigland return -ENOENT; 650597d0caeSDavid Teigland 651597d0caeSDavid Teigland sigfillset(&allsigs); 652597d0caeSDavid Teigland sigprocmask(SIG_BLOCK, &allsigs, &tmpsig); 653597d0caeSDavid Teigland 654597d0caeSDavid Teigland set_bit(DLM_PROC_FLAGS_CLOSING, &proc->flags); 655597d0caeSDavid Teigland 656597d0caeSDavid Teigland dlm_clear_proc_locks(ls, proc); 657597d0caeSDavid Teigland 658597d0caeSDavid Teigland /* at this point no more lkb's should exist for this lockspace, 659597d0caeSDavid Teigland so there's no chance of dlm_user_add_ast() being called and 660597d0caeSDavid Teigland looking for lkb->ua->proc */ 661597d0caeSDavid Teigland 662597d0caeSDavid Teigland kfree(proc); 663597d0caeSDavid Teigland file->private_data = NULL; 664597d0caeSDavid Teigland 665597d0caeSDavid Teigland dlm_put_lockspace(ls); 666597d0caeSDavid Teigland dlm_put_lockspace(ls); /* for the find in device_open() */ 667597d0caeSDavid Teigland 668597d0caeSDavid Teigland /* FIXME: AUTOFREE: if this ls is no longer used do 669597d0caeSDavid Teigland device_remove_lockspace() */ 670597d0caeSDavid Teigland 671597d0caeSDavid Teigland sigprocmask(SIG_SETMASK, &tmpsig, NULL); 672597d0caeSDavid Teigland recalc_sigpending(); 673597d0caeSDavid Teigland 674597d0caeSDavid Teigland return 0; 675597d0caeSDavid Teigland } 676597d0caeSDavid Teigland 677597d0caeSDavid Teigland static int copy_result_to_user(struct dlm_user_args *ua, int compat, int type, 678597d0caeSDavid Teigland int bmode, char __user *buf, size_t count) 679597d0caeSDavid Teigland { 680597d0caeSDavid Teigland #ifdef CONFIG_COMPAT 681597d0caeSDavid Teigland struct dlm_lock_result32 result32; 682597d0caeSDavid Teigland #endif 683597d0caeSDavid Teigland struct dlm_lock_result result; 684597d0caeSDavid Teigland void *resultptr; 685597d0caeSDavid Teigland int error=0; 686597d0caeSDavid Teigland int len; 687597d0caeSDavid Teigland int struct_len; 688597d0caeSDavid Teigland 689597d0caeSDavid Teigland memset(&result, 0, sizeof(struct dlm_lock_result)); 690d7db923eSDavid Teigland result.version[0] = DLM_DEVICE_VERSION_MAJOR; 691d7db923eSDavid Teigland result.version[1] = DLM_DEVICE_VERSION_MINOR; 692d7db923eSDavid Teigland result.version[2] = DLM_DEVICE_VERSION_PATCH; 693597d0caeSDavid Teigland memcpy(&result.lksb, &ua->lksb, sizeof(struct dlm_lksb)); 694597d0caeSDavid Teigland result.user_lksb = ua->user_lksb; 695597d0caeSDavid Teigland 696597d0caeSDavid Teigland /* FIXME: dlm1 provides for the user's bastparam/addr to not be updated 697597d0caeSDavid Teigland in a conversion unless the conversion is successful. See code 698597d0caeSDavid Teigland in dlm_user_convert() for updating ua from ua_tmp. OpenVMS, though, 699597d0caeSDavid Teigland notes that a new blocking AST address and parameter are set even if 700597d0caeSDavid Teigland the conversion fails, so maybe we should just do that. */ 701597d0caeSDavid Teigland 702597d0caeSDavid Teigland if (type == AST_BAST) { 703597d0caeSDavid Teigland result.user_astaddr = ua->bastaddr; 704597d0caeSDavid Teigland result.user_astparam = ua->bastparam; 705597d0caeSDavid Teigland result.bast_mode = bmode; 706597d0caeSDavid Teigland } else { 707597d0caeSDavid Teigland result.user_astaddr = ua->castaddr; 708597d0caeSDavid Teigland result.user_astparam = ua->castparam; 709597d0caeSDavid Teigland } 710597d0caeSDavid Teigland 711597d0caeSDavid Teigland #ifdef CONFIG_COMPAT 712597d0caeSDavid Teigland if (compat) 713597d0caeSDavid Teigland len = sizeof(struct dlm_lock_result32); 714597d0caeSDavid Teigland else 715597d0caeSDavid Teigland #endif 716597d0caeSDavid Teigland len = sizeof(struct dlm_lock_result); 717597d0caeSDavid Teigland struct_len = len; 718597d0caeSDavid Teigland 719597d0caeSDavid Teigland /* copy lvb to userspace if there is one, it's been updated, and 720597d0caeSDavid Teigland the user buffer has space for it */ 721597d0caeSDavid Teigland 722597d0caeSDavid Teigland if (ua->update_user_lvb && ua->lksb.sb_lvbptr && 723597d0caeSDavid Teigland count >= len + DLM_USER_LVB_LEN) { 724597d0caeSDavid Teigland if (copy_to_user(buf+len, ua->lksb.sb_lvbptr, 725597d0caeSDavid Teigland DLM_USER_LVB_LEN)) { 726597d0caeSDavid Teigland error = -EFAULT; 727597d0caeSDavid Teigland goto out; 728597d0caeSDavid Teigland } 729597d0caeSDavid Teigland 730597d0caeSDavid Teigland result.lvb_offset = len; 731597d0caeSDavid Teigland len += DLM_USER_LVB_LEN; 732597d0caeSDavid Teigland } 733597d0caeSDavid Teigland 734597d0caeSDavid Teigland result.length = len; 735597d0caeSDavid Teigland resultptr = &result; 736597d0caeSDavid Teigland #ifdef CONFIG_COMPAT 737597d0caeSDavid Teigland if (compat) { 738597d0caeSDavid Teigland compat_output(&result, &result32); 739597d0caeSDavid Teigland resultptr = &result32; 740597d0caeSDavid Teigland } 741597d0caeSDavid Teigland #endif 742597d0caeSDavid Teigland 743597d0caeSDavid Teigland if (copy_to_user(buf, resultptr, struct_len)) 744597d0caeSDavid Teigland error = -EFAULT; 745597d0caeSDavid Teigland else 746597d0caeSDavid Teigland error = len; 747597d0caeSDavid Teigland out: 748597d0caeSDavid Teigland return error; 749597d0caeSDavid Teigland } 750597d0caeSDavid Teigland 751d7db923eSDavid Teigland static int copy_version_to_user(char __user *buf, size_t count) 752d7db923eSDavid Teigland { 753d7db923eSDavid Teigland struct dlm_device_version ver; 754d7db923eSDavid Teigland 755d7db923eSDavid Teigland memset(&ver, 0, sizeof(struct dlm_device_version)); 756d7db923eSDavid Teigland ver.version[0] = DLM_DEVICE_VERSION_MAJOR; 757d7db923eSDavid Teigland ver.version[1] = DLM_DEVICE_VERSION_MINOR; 758d7db923eSDavid Teigland ver.version[2] = DLM_DEVICE_VERSION_PATCH; 759d7db923eSDavid Teigland 760d7db923eSDavid Teigland if (copy_to_user(buf, &ver, sizeof(struct dlm_device_version))) 761d7db923eSDavid Teigland return -EFAULT; 762d7db923eSDavid Teigland return sizeof(struct dlm_device_version); 763d7db923eSDavid Teigland } 764d7db923eSDavid Teigland 765597d0caeSDavid Teigland /* a read returns a single ast described in a struct dlm_lock_result */ 766597d0caeSDavid Teigland 767597d0caeSDavid Teigland static ssize_t device_read(struct file *file, char __user *buf, size_t count, 768597d0caeSDavid Teigland loff_t *ppos) 769597d0caeSDavid Teigland { 770597d0caeSDavid Teigland struct dlm_user_proc *proc = file->private_data; 771597d0caeSDavid Teigland struct dlm_lkb *lkb; 772597d0caeSDavid Teigland struct dlm_user_args *ua; 773597d0caeSDavid Teigland DECLARE_WAITQUEUE(wait, current); 774597d0caeSDavid Teigland int error, type=0, bmode=0, removed = 0; 775597d0caeSDavid Teigland 776d7db923eSDavid Teigland if (count == sizeof(struct dlm_device_version)) { 777d7db923eSDavid Teigland error = copy_version_to_user(buf, count); 778d7db923eSDavid Teigland return error; 779d7db923eSDavid Teigland } 780d7db923eSDavid Teigland 781d7db923eSDavid Teigland if (!proc) { 782d7db923eSDavid Teigland log_print("non-version read from control device %zu", count); 783d7db923eSDavid Teigland return -EINVAL; 784d7db923eSDavid Teigland } 785d7db923eSDavid Teigland 786597d0caeSDavid Teigland #ifdef CONFIG_COMPAT 787597d0caeSDavid Teigland if (count < sizeof(struct dlm_lock_result32)) 788597d0caeSDavid Teigland #else 789597d0caeSDavid Teigland if (count < sizeof(struct dlm_lock_result)) 790597d0caeSDavid Teigland #endif 791597d0caeSDavid Teigland return -EINVAL; 792597d0caeSDavid Teigland 793597d0caeSDavid Teigland /* do we really need this? can a read happen after a close? */ 794597d0caeSDavid Teigland if (test_bit(DLM_PROC_FLAGS_CLOSING, &proc->flags)) 795597d0caeSDavid Teigland return -EINVAL; 796597d0caeSDavid Teigland 797597d0caeSDavid Teigland spin_lock(&proc->asts_spin); 798597d0caeSDavid Teigland if (list_empty(&proc->asts)) { 799597d0caeSDavid Teigland if (file->f_flags & O_NONBLOCK) { 800597d0caeSDavid Teigland spin_unlock(&proc->asts_spin); 801597d0caeSDavid Teigland return -EAGAIN; 802597d0caeSDavid Teigland } 803597d0caeSDavid Teigland 804597d0caeSDavid Teigland add_wait_queue(&proc->wait, &wait); 805597d0caeSDavid Teigland 806597d0caeSDavid Teigland repeat: 807597d0caeSDavid Teigland set_current_state(TASK_INTERRUPTIBLE); 808597d0caeSDavid Teigland if (list_empty(&proc->asts) && !signal_pending(current)) { 809597d0caeSDavid Teigland spin_unlock(&proc->asts_spin); 810597d0caeSDavid Teigland schedule(); 811597d0caeSDavid Teigland spin_lock(&proc->asts_spin); 812597d0caeSDavid Teigland goto repeat; 813597d0caeSDavid Teigland } 814597d0caeSDavid Teigland set_current_state(TASK_RUNNING); 815597d0caeSDavid Teigland remove_wait_queue(&proc->wait, &wait); 816597d0caeSDavid Teigland 817597d0caeSDavid Teigland if (signal_pending(current)) { 818597d0caeSDavid Teigland spin_unlock(&proc->asts_spin); 819597d0caeSDavid Teigland return -ERESTARTSYS; 820597d0caeSDavid Teigland } 821597d0caeSDavid Teigland } 822597d0caeSDavid Teigland 823597d0caeSDavid Teigland /* there may be both completion and blocking asts to return for 824597d0caeSDavid Teigland the lkb, don't remove lkb from asts list unless no asts remain */ 825597d0caeSDavid Teigland 826597d0caeSDavid Teigland lkb = list_entry(proc->asts.next, struct dlm_lkb, lkb_astqueue); 827597d0caeSDavid Teigland 828597d0caeSDavid Teigland if (lkb->lkb_ast_type & AST_COMP) { 829597d0caeSDavid Teigland lkb->lkb_ast_type &= ~AST_COMP; 830597d0caeSDavid Teigland type = AST_COMP; 831597d0caeSDavid Teigland } else if (lkb->lkb_ast_type & AST_BAST) { 832597d0caeSDavid Teigland lkb->lkb_ast_type &= ~AST_BAST; 833597d0caeSDavid Teigland type = AST_BAST; 834597d0caeSDavid Teigland bmode = lkb->lkb_bastmode; 835597d0caeSDavid Teigland } 836597d0caeSDavid Teigland 837597d0caeSDavid Teigland if (!lkb->lkb_ast_type) { 838597d0caeSDavid Teigland list_del(&lkb->lkb_astqueue); 839597d0caeSDavid Teigland removed = 1; 840597d0caeSDavid Teigland } 841597d0caeSDavid Teigland spin_unlock(&proc->asts_spin); 842597d0caeSDavid Teigland 843597d0caeSDavid Teigland ua = (struct dlm_user_args *)lkb->lkb_astparam; 844597d0caeSDavid Teigland error = copy_result_to_user(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 899597d0caeSDavid Teigland int dlm_user_init(void) 900597d0caeSDavid Teigland { 901597d0caeSDavid Teigland int error; 902597d0caeSDavid Teigland 903597d0caeSDavid Teigland ctl_device.name = "dlm-control"; 904597d0caeSDavid Teigland ctl_device.fops = &ctl_device_fops; 905597d0caeSDavid Teigland ctl_device.minor = MISC_DYNAMIC_MINOR; 906597d0caeSDavid Teigland 907597d0caeSDavid Teigland error = misc_register(&ctl_device); 908597d0caeSDavid Teigland if (error) 909597d0caeSDavid Teigland log_print("misc_register failed for control device"); 910597d0caeSDavid Teigland 911597d0caeSDavid Teigland return error; 912597d0caeSDavid Teigland } 913597d0caeSDavid Teigland 914597d0caeSDavid Teigland void dlm_user_exit(void) 915597d0caeSDavid Teigland { 916597d0caeSDavid Teigland misc_deregister(&ctl_device); 917597d0caeSDavid Teigland } 918597d0caeSDavid Teigland 919