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, 85*2a79289eSPatrick Caulfeld struct dlm_write_request32 *kb32, 86*2a79289eSPatrick Caulfeld int max_namelen) 87597d0caeSDavid Teigland { 88597d0caeSDavid Teigland kb->version[0] = kb32->version[0]; 89597d0caeSDavid Teigland kb->version[1] = kb32->version[1]; 90597d0caeSDavid Teigland kb->version[2] = kb32->version[2]; 91597d0caeSDavid Teigland 92597d0caeSDavid Teigland kb->cmd = kb32->cmd; 93597d0caeSDavid Teigland kb->is64bit = kb32->is64bit; 94597d0caeSDavid Teigland if (kb->cmd == DLM_USER_CREATE_LOCKSPACE || 95597d0caeSDavid Teigland kb->cmd == DLM_USER_REMOVE_LOCKSPACE) { 96597d0caeSDavid Teigland kb->i.lspace.flags = kb32->i.lspace.flags; 97597d0caeSDavid Teigland kb->i.lspace.minor = kb32->i.lspace.minor; 98597d0caeSDavid Teigland strcpy(kb->i.lspace.name, kb32->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); 116*2a79289eSPatrick Caulfeld if (kb->i.lock.namelen <= max_namelen) 117*2a79289eSPatrick Caulfeld memcpy(kb->i.lock.name, kb32->i.lock.name, 118*2a79289eSPatrick Caulfeld kb->i.lock.namelen); 119*2a79289eSPatrick Caulfeld else 120*2a79289eSPatrick Caulfeld kb->i.lock.namelen = max_namelen; 121597d0caeSDavid Teigland } 122597d0caeSDavid Teigland } 123597d0caeSDavid Teigland 124597d0caeSDavid Teigland static void compat_output(struct dlm_lock_result *res, 125597d0caeSDavid Teigland struct dlm_lock_result32 *res32) 126597d0caeSDavid Teigland { 127d7db923eSDavid Teigland res32->version[0] = res->version[0]; 128d7db923eSDavid Teigland res32->version[1] = res->version[1]; 129d7db923eSDavid Teigland res32->version[2] = res->version[2]; 130d7db923eSDavid Teigland 131597d0caeSDavid Teigland res32->user_astaddr = (__u32)(long)res->user_astaddr; 132597d0caeSDavid Teigland res32->user_astparam = (__u32)(long)res->user_astparam; 133597d0caeSDavid Teigland res32->user_lksb = (__u32)(long)res->user_lksb; 134597d0caeSDavid Teigland res32->bast_mode = res->bast_mode; 135597d0caeSDavid Teigland 136597d0caeSDavid Teigland res32->lvb_offset = res->lvb_offset; 137597d0caeSDavid Teigland res32->length = res->length; 138597d0caeSDavid Teigland 139597d0caeSDavid Teigland res32->lksb.sb_status = res->lksb.sb_status; 140597d0caeSDavid Teigland res32->lksb.sb_flags = res->lksb.sb_flags; 141597d0caeSDavid Teigland res32->lksb.sb_lkid = res->lksb.sb_lkid; 142597d0caeSDavid Teigland res32->lksb.sb_lvbptr = (__u32)(long)res->lksb.sb_lvbptr; 143597d0caeSDavid Teigland } 144597d0caeSDavid Teigland #endif 145597d0caeSDavid Teigland 14684d8cd69SDavid Teigland /* Figure out if this lock is at the end of its life and no longer 14784d8cd69SDavid Teigland available for the application to use. The lkb still exists until 14884d8cd69SDavid Teigland the final ast is read. A lock becomes EOL in three situations: 14984d8cd69SDavid Teigland 1. a noqueue request fails with EAGAIN 15084d8cd69SDavid Teigland 2. an unlock completes with EUNLOCK 15184d8cd69SDavid Teigland 3. a cancel of a waiting request completes with ECANCEL/EDEADLK 15284d8cd69SDavid Teigland An EOL lock needs to be removed from the process's list of locks. 15384d8cd69SDavid Teigland And we can't allow any new operation on an EOL lock. This is 15484d8cd69SDavid Teigland not related to the lifetime of the lkb struct which is managed 15584d8cd69SDavid Teigland entirely by refcount. */ 15684d8cd69SDavid Teigland 15784d8cd69SDavid Teigland static int lkb_is_endoflife(struct dlm_lkb *lkb, int sb_status, int type) 15884d8cd69SDavid Teigland { 15984d8cd69SDavid Teigland switch (sb_status) { 16084d8cd69SDavid Teigland case -DLM_EUNLOCK: 16184d8cd69SDavid Teigland return 1; 16284d8cd69SDavid Teigland case -DLM_ECANCEL: 16384d8cd69SDavid Teigland case -ETIMEDOUT: 1648b4021faSDavid Teigland case -EDEADLK: 16584d8cd69SDavid Teigland if (lkb->lkb_grmode == DLM_LOCK_IV) 16684d8cd69SDavid Teigland return 1; 16784d8cd69SDavid Teigland break; 16884d8cd69SDavid Teigland case -EAGAIN: 16984d8cd69SDavid Teigland if (type == AST_COMP && lkb->lkb_grmode == DLM_LOCK_IV) 17084d8cd69SDavid Teigland return 1; 17184d8cd69SDavid Teigland break; 17284d8cd69SDavid Teigland } 17384d8cd69SDavid Teigland return 0; 17484d8cd69SDavid Teigland } 17584d8cd69SDavid Teigland 176ef0c2bb0SDavid Teigland /* we could possibly check if the cancel of an orphan has resulted in the lkb 177ef0c2bb0SDavid Teigland being removed and then remove that lkb from the orphans list and free it */ 178597d0caeSDavid Teigland 179597d0caeSDavid Teigland void dlm_user_add_ast(struct dlm_lkb *lkb, int type) 180597d0caeSDavid Teigland { 181597d0caeSDavid Teigland struct dlm_ls *ls; 182597d0caeSDavid Teigland struct dlm_user_args *ua; 183597d0caeSDavid Teigland struct dlm_user_proc *proc; 184ef0c2bb0SDavid Teigland int eol = 0, ast_type; 185597d0caeSDavid Teigland 186ef0c2bb0SDavid Teigland if (lkb->lkb_flags & (DLM_IFL_ORPHAN | DLM_IFL_DEAD)) 187597d0caeSDavid Teigland return; 188597d0caeSDavid Teigland 189597d0caeSDavid Teigland ls = lkb->lkb_resource->res_ls; 190597d0caeSDavid Teigland mutex_lock(&ls->ls_clear_proc_locks); 191597d0caeSDavid Teigland 192597d0caeSDavid Teigland /* If ORPHAN/DEAD flag is set, it means the process is dead so an ast 193597d0caeSDavid Teigland can't be delivered. For ORPHAN's, dlm_clear_proc_locks() freed 194ef0c2bb0SDavid Teigland lkb->ua so we can't try to use it. This second check is necessary 195ef0c2bb0SDavid Teigland for cases where a completion ast is received for an operation that 196ef0c2bb0SDavid Teigland began before clear_proc_locks did its cancel/unlock. */ 197597d0caeSDavid Teigland 198ef0c2bb0SDavid Teigland if (lkb->lkb_flags & (DLM_IFL_ORPHAN | DLM_IFL_DEAD)) 199597d0caeSDavid Teigland goto out; 200597d0caeSDavid Teigland 201597d0caeSDavid Teigland DLM_ASSERT(lkb->lkb_astparam, dlm_print_lkb(lkb);); 202597d0caeSDavid Teigland ua = (struct dlm_user_args *)lkb->lkb_astparam; 203597d0caeSDavid Teigland proc = ua->proc; 204597d0caeSDavid Teigland 205597d0caeSDavid Teigland if (type == AST_BAST && ua->bastaddr == NULL) 206597d0caeSDavid Teigland goto out; 207597d0caeSDavid Teigland 208597d0caeSDavid Teigland spin_lock(&proc->asts_spin); 209ef0c2bb0SDavid Teigland 210ef0c2bb0SDavid Teigland ast_type = lkb->lkb_ast_type; 211ef0c2bb0SDavid Teigland lkb->lkb_ast_type |= type; 212ef0c2bb0SDavid Teigland 213ef0c2bb0SDavid Teigland if (!ast_type) { 214597d0caeSDavid Teigland kref_get(&lkb->lkb_ref); 215597d0caeSDavid Teigland list_add_tail(&lkb->lkb_astqueue, &proc->asts); 216597d0caeSDavid Teigland wake_up_interruptible(&proc->wait); 217597d0caeSDavid Teigland } 218ef0c2bb0SDavid Teigland if (type == AST_COMP && (ast_type & AST_COMP)) 219ef0c2bb0SDavid Teigland log_debug(ls, "ast overlap %x status %x %x", 220ef0c2bb0SDavid Teigland lkb->lkb_id, ua->lksb.sb_status, lkb->lkb_flags); 221597d0caeSDavid Teigland 22284d8cd69SDavid Teigland eol = lkb_is_endoflife(lkb, ua->lksb.sb_status, type); 223ef0c2bb0SDavid Teigland if (eol) { 224ef0c2bb0SDavid Teigland lkb->lkb_ast_type &= ~AST_BAST; 225ef0c2bb0SDavid Teigland lkb->lkb_flags |= DLM_IFL_ENDOFLIFE; 226ef0c2bb0SDavid Teigland } 227a1bc86e6SDavid Teigland 228597d0caeSDavid Teigland /* We want to copy the lvb to userspace when the completion 229597d0caeSDavid Teigland ast is read if the status is 0, the lock has an lvb and 230597d0caeSDavid Teigland lvb_ops says we should. We could probably have set_lvb_lock() 231597d0caeSDavid Teigland set update_user_lvb instead and not need old_mode */ 232597d0caeSDavid Teigland 233597d0caeSDavid Teigland if ((lkb->lkb_ast_type & AST_COMP) && 234597d0caeSDavid Teigland (lkb->lkb_lksb->sb_status == 0) && 235597d0caeSDavid Teigland lkb->lkb_lksb->sb_lvbptr && 236597d0caeSDavid Teigland dlm_lvb_operations[ua->old_mode + 1][lkb->lkb_grmode + 1]) 237597d0caeSDavid Teigland ua->update_user_lvb = 1; 238597d0caeSDavid Teigland else 239597d0caeSDavid Teigland ua->update_user_lvb = 0; 240597d0caeSDavid Teigland 241597d0caeSDavid Teigland spin_unlock(&proc->asts_spin); 24234e22bedSDavid Teigland 243ef0c2bb0SDavid Teigland if (eol) { 244ce5246b9SDavid Teigland spin_lock(&proc->locks_spin); 245ef0c2bb0SDavid Teigland if (!list_empty(&lkb->lkb_ownqueue)) { 24634e22bedSDavid Teigland list_del_init(&lkb->lkb_ownqueue); 24734e22bedSDavid Teigland dlm_put_lkb(lkb); 24834e22bedSDavid Teigland } 249ce5246b9SDavid Teigland spin_unlock(&proc->locks_spin); 250ef0c2bb0SDavid Teigland } 251597d0caeSDavid Teigland out: 252597d0caeSDavid Teigland mutex_unlock(&ls->ls_clear_proc_locks); 253597d0caeSDavid Teigland } 254597d0caeSDavid Teigland 255597d0caeSDavid Teigland static int device_user_lock(struct dlm_user_proc *proc, 256597d0caeSDavid Teigland struct dlm_lock_params *params) 257597d0caeSDavid Teigland { 258597d0caeSDavid Teigland struct dlm_ls *ls; 259597d0caeSDavid Teigland struct dlm_user_args *ua; 260597d0caeSDavid Teigland int error = -ENOMEM; 261597d0caeSDavid Teigland 262597d0caeSDavid Teigland ls = dlm_find_lockspace_local(proc->lockspace); 263597d0caeSDavid Teigland if (!ls) 264597d0caeSDavid Teigland return -ENOENT; 265597d0caeSDavid Teigland 266597d0caeSDavid Teigland if (!params->castaddr || !params->lksb) { 267597d0caeSDavid Teigland error = -EINVAL; 268597d0caeSDavid Teigland goto out; 269597d0caeSDavid Teigland } 270597d0caeSDavid Teigland 271597d0caeSDavid Teigland ua = kzalloc(sizeof(struct dlm_user_args), GFP_KERNEL); 272597d0caeSDavid Teigland if (!ua) 273597d0caeSDavid Teigland goto out; 274597d0caeSDavid Teigland ua->proc = proc; 275597d0caeSDavid Teigland ua->user_lksb = params->lksb; 276597d0caeSDavid Teigland ua->castparam = params->castparam; 277597d0caeSDavid Teigland ua->castaddr = params->castaddr; 278597d0caeSDavid Teigland ua->bastparam = params->bastparam; 279597d0caeSDavid Teigland ua->bastaddr = params->bastaddr; 280d7db923eSDavid Teigland ua->xid = params->xid; 281597d0caeSDavid Teigland 282597d0caeSDavid Teigland if (params->flags & DLM_LKF_CONVERT) 283597d0caeSDavid Teigland error = dlm_user_convert(ls, ua, 284597d0caeSDavid Teigland params->mode, params->flags, 285d7db923eSDavid Teigland params->lkid, params->lvb, 286d7db923eSDavid Teigland (unsigned long) params->timeout); 287597d0caeSDavid Teigland else { 288597d0caeSDavid Teigland error = dlm_user_request(ls, ua, 289597d0caeSDavid Teigland params->mode, params->flags, 290597d0caeSDavid Teigland params->name, params->namelen, 291d7db923eSDavid Teigland (unsigned long) params->timeout); 292597d0caeSDavid Teigland if (!error) 293597d0caeSDavid Teigland error = ua->lksb.sb_lkid; 294597d0caeSDavid Teigland } 295597d0caeSDavid Teigland out: 296597d0caeSDavid Teigland dlm_put_lockspace(ls); 297597d0caeSDavid Teigland return error; 298597d0caeSDavid Teigland } 299597d0caeSDavid Teigland 300597d0caeSDavid Teigland static int device_user_unlock(struct dlm_user_proc *proc, 301597d0caeSDavid Teigland struct dlm_lock_params *params) 302597d0caeSDavid Teigland { 303597d0caeSDavid Teigland struct dlm_ls *ls; 304597d0caeSDavid Teigland struct dlm_user_args *ua; 305597d0caeSDavid Teigland int error = -ENOMEM; 306597d0caeSDavid Teigland 307597d0caeSDavid Teigland ls = dlm_find_lockspace_local(proc->lockspace); 308597d0caeSDavid Teigland if (!ls) 309597d0caeSDavid Teigland return -ENOENT; 310597d0caeSDavid Teigland 311597d0caeSDavid Teigland ua = kzalloc(sizeof(struct dlm_user_args), GFP_KERNEL); 312597d0caeSDavid Teigland if (!ua) 313597d0caeSDavid Teigland goto out; 314597d0caeSDavid Teigland ua->proc = proc; 315597d0caeSDavid Teigland ua->user_lksb = params->lksb; 316597d0caeSDavid Teigland ua->castparam = params->castparam; 317597d0caeSDavid Teigland ua->castaddr = params->castaddr; 318597d0caeSDavid Teigland 319597d0caeSDavid Teigland if (params->flags & DLM_LKF_CANCEL) 320597d0caeSDavid Teigland error = dlm_user_cancel(ls, ua, params->flags, params->lkid); 321597d0caeSDavid Teigland else 322597d0caeSDavid Teigland error = dlm_user_unlock(ls, ua, params->flags, params->lkid, 323597d0caeSDavid Teigland params->lvb); 324597d0caeSDavid Teigland out: 325597d0caeSDavid Teigland dlm_put_lockspace(ls); 326597d0caeSDavid Teigland return error; 327597d0caeSDavid Teigland } 328597d0caeSDavid Teigland 3298b4021faSDavid Teigland static int device_user_deadlock(struct dlm_user_proc *proc, 3308b4021faSDavid Teigland struct dlm_lock_params *params) 3318b4021faSDavid Teigland { 3328b4021faSDavid Teigland struct dlm_ls *ls; 3338b4021faSDavid Teigland int error; 3348b4021faSDavid Teigland 3358b4021faSDavid Teigland ls = dlm_find_lockspace_local(proc->lockspace); 3368b4021faSDavid Teigland if (!ls) 3378b4021faSDavid Teigland return -ENOENT; 3388b4021faSDavid Teigland 3398b4021faSDavid Teigland error = dlm_user_deadlock(ls, params->flags, params->lkid); 3408b4021faSDavid Teigland 3418b4021faSDavid Teigland dlm_put_lockspace(ls); 3428b4021faSDavid Teigland return error; 3438b4021faSDavid Teigland } 3448b4021faSDavid Teigland 345254da030SPatrick Caulfield static int create_misc_device(struct dlm_ls *ls, char *name) 346254da030SPatrick Caulfield { 347254da030SPatrick Caulfield int error, len; 348254da030SPatrick Caulfield 349254da030SPatrick Caulfield error = -ENOMEM; 350254da030SPatrick Caulfield len = strlen(name) + strlen(name_prefix) + 2; 351254da030SPatrick Caulfield ls->ls_device.name = kzalloc(len, GFP_KERNEL); 352254da030SPatrick Caulfield if (!ls->ls_device.name) 353254da030SPatrick Caulfield goto fail; 354254da030SPatrick Caulfield 355254da030SPatrick Caulfield snprintf((char *)ls->ls_device.name, len, "%s_%s", name_prefix, 356254da030SPatrick Caulfield name); 357254da030SPatrick Caulfield ls->ls_device.fops = &device_fops; 358254da030SPatrick Caulfield ls->ls_device.minor = MISC_DYNAMIC_MINOR; 359254da030SPatrick Caulfield 360254da030SPatrick Caulfield error = misc_register(&ls->ls_device); 361254da030SPatrick Caulfield if (error) { 362254da030SPatrick Caulfield kfree(ls->ls_device.name); 363254da030SPatrick Caulfield } 364254da030SPatrick Caulfield fail: 365254da030SPatrick Caulfield return error; 366254da030SPatrick Caulfield } 367254da030SPatrick Caulfield 36872c2be77SDavid Teigland static int device_user_purge(struct dlm_user_proc *proc, 36972c2be77SDavid Teigland struct dlm_purge_params *params) 37072c2be77SDavid Teigland { 37172c2be77SDavid Teigland struct dlm_ls *ls; 37272c2be77SDavid Teigland int error; 37372c2be77SDavid Teigland 37472c2be77SDavid Teigland ls = dlm_find_lockspace_local(proc->lockspace); 37572c2be77SDavid Teigland if (!ls) 37672c2be77SDavid Teigland return -ENOENT; 37772c2be77SDavid Teigland 37872c2be77SDavid Teigland error = dlm_user_purge(ls, proc, params->nodeid, params->pid); 37972c2be77SDavid Teigland 38072c2be77SDavid Teigland dlm_put_lockspace(ls); 38172c2be77SDavid Teigland return error; 38272c2be77SDavid Teigland } 38372c2be77SDavid Teigland 384597d0caeSDavid Teigland static int device_create_lockspace(struct dlm_lspace_params *params) 385597d0caeSDavid Teigland { 386597d0caeSDavid Teigland dlm_lockspace_t *lockspace; 387597d0caeSDavid Teigland struct dlm_ls *ls; 388254da030SPatrick Caulfield int error; 389597d0caeSDavid Teigland 390597d0caeSDavid Teigland if (!capable(CAP_SYS_ADMIN)) 391597d0caeSDavid Teigland return -EPERM; 392597d0caeSDavid Teigland 393597d0caeSDavid Teigland error = dlm_new_lockspace(params->name, strlen(params->name), 3943ae1acf9SDavid Teigland &lockspace, params->flags, DLM_USER_LVB_LEN); 395597d0caeSDavid Teigland if (error) 396597d0caeSDavid Teigland return error; 397597d0caeSDavid Teigland 398597d0caeSDavid Teigland ls = dlm_find_lockspace_local(lockspace); 399597d0caeSDavid Teigland if (!ls) 400597d0caeSDavid Teigland return -ENOENT; 401597d0caeSDavid Teigland 402254da030SPatrick Caulfield error = create_misc_device(ls, params->name); 403597d0caeSDavid Teigland dlm_put_lockspace(ls); 404597d0caeSDavid Teigland 405254da030SPatrick Caulfield if (error) 406597d0caeSDavid Teigland dlm_release_lockspace(lockspace, 0); 407254da030SPatrick Caulfield else 408254da030SPatrick Caulfield error = ls->ls_device.minor; 409254da030SPatrick Caulfield 410597d0caeSDavid Teigland return error; 411597d0caeSDavid Teigland } 412597d0caeSDavid Teigland 413597d0caeSDavid Teigland static int device_remove_lockspace(struct dlm_lspace_params *params) 414597d0caeSDavid Teigland { 415597d0caeSDavid Teigland dlm_lockspace_t *lockspace; 416597d0caeSDavid Teigland struct dlm_ls *ls; 417c6e6f0baSDavid Teigland int error, force = 0; 418597d0caeSDavid Teigland 419597d0caeSDavid Teigland if (!capable(CAP_SYS_ADMIN)) 420597d0caeSDavid Teigland return -EPERM; 421597d0caeSDavid Teigland 422597d0caeSDavid Teigland ls = dlm_find_lockspace_device(params->minor); 423597d0caeSDavid Teigland if (!ls) 424597d0caeSDavid Teigland return -ENOENT; 425597d0caeSDavid Teigland 426254da030SPatrick Caulfield /* Deregister the misc device first, so we don't have 427254da030SPatrick Caulfield * a device that's not attached to a lockspace. If 428254da030SPatrick Caulfield * dlm_release_lockspace fails then we can recreate it 429254da030SPatrick Caulfield */ 430597d0caeSDavid Teigland error = misc_deregister(&ls->ls_device); 431597d0caeSDavid Teigland if (error) { 432597d0caeSDavid Teigland dlm_put_lockspace(ls); 433597d0caeSDavid Teigland goto out; 434597d0caeSDavid Teigland } 435597d0caeSDavid Teigland kfree(ls->ls_device.name); 436597d0caeSDavid Teigland 437c6e6f0baSDavid Teigland if (params->flags & DLM_USER_LSFLG_FORCEFREE) 438c6e6f0baSDavid Teigland force = 2; 439c6e6f0baSDavid Teigland 440597d0caeSDavid Teigland lockspace = ls->ls_local_handle; 441597d0caeSDavid Teigland 442597d0caeSDavid Teigland /* dlm_release_lockspace waits for references to go to zero, 443597d0caeSDavid Teigland so all processes will need to close their device for the ls 444597d0caeSDavid Teigland before the release will procede */ 445597d0caeSDavid Teigland 446597d0caeSDavid Teigland dlm_put_lockspace(ls); 447c6e6f0baSDavid Teigland error = dlm_release_lockspace(lockspace, force); 448254da030SPatrick Caulfield if (error) 449254da030SPatrick Caulfield create_misc_device(ls, ls->ls_name); 450597d0caeSDavid Teigland out: 451597d0caeSDavid Teigland return error; 452597d0caeSDavid Teigland } 453597d0caeSDavid Teigland 454597d0caeSDavid Teigland /* Check the user's version matches ours */ 455597d0caeSDavid Teigland static int check_version(struct dlm_write_request *req) 456597d0caeSDavid Teigland { 457597d0caeSDavid Teigland if (req->version[0] != DLM_DEVICE_VERSION_MAJOR || 458597d0caeSDavid Teigland (req->version[0] == DLM_DEVICE_VERSION_MAJOR && 459597d0caeSDavid Teigland req->version[1] > DLM_DEVICE_VERSION_MINOR)) { 460597d0caeSDavid Teigland 461597d0caeSDavid Teigland printk(KERN_DEBUG "dlm: process %s (%d) version mismatch " 462597d0caeSDavid Teigland "user (%d.%d.%d) kernel (%d.%d.%d)\n", 463597d0caeSDavid Teigland current->comm, 464ba25f9dcSPavel Emelyanov task_pid_nr(current), 465597d0caeSDavid Teigland req->version[0], 466597d0caeSDavid Teigland req->version[1], 467597d0caeSDavid Teigland req->version[2], 468597d0caeSDavid Teigland DLM_DEVICE_VERSION_MAJOR, 469597d0caeSDavid Teigland DLM_DEVICE_VERSION_MINOR, 470597d0caeSDavid Teigland DLM_DEVICE_VERSION_PATCH); 471597d0caeSDavid Teigland return -EINVAL; 472597d0caeSDavid Teigland } 473597d0caeSDavid Teigland return 0; 474597d0caeSDavid Teigland } 475597d0caeSDavid Teigland 476597d0caeSDavid Teigland /* 477597d0caeSDavid Teigland * device_write 478597d0caeSDavid Teigland * 479597d0caeSDavid Teigland * device_user_lock 480597d0caeSDavid Teigland * dlm_user_request -> request_lock 481597d0caeSDavid Teigland * dlm_user_convert -> convert_lock 482597d0caeSDavid Teigland * 483597d0caeSDavid Teigland * device_user_unlock 484597d0caeSDavid Teigland * dlm_user_unlock -> unlock_lock 485597d0caeSDavid Teigland * dlm_user_cancel -> cancel_lock 486597d0caeSDavid Teigland * 487597d0caeSDavid Teigland * device_create_lockspace 488597d0caeSDavid Teigland * dlm_new_lockspace 489597d0caeSDavid Teigland * 490597d0caeSDavid Teigland * device_remove_lockspace 491597d0caeSDavid Teigland * dlm_release_lockspace 492597d0caeSDavid Teigland */ 493597d0caeSDavid Teigland 494597d0caeSDavid Teigland /* a write to a lockspace device is a lock or unlock request, a write 495597d0caeSDavid Teigland to the control device is to create/remove a lockspace */ 496597d0caeSDavid Teigland 497597d0caeSDavid Teigland static ssize_t device_write(struct file *file, const char __user *buf, 498597d0caeSDavid Teigland size_t count, loff_t *ppos) 499597d0caeSDavid Teigland { 500597d0caeSDavid Teigland struct dlm_user_proc *proc = file->private_data; 501597d0caeSDavid Teigland struct dlm_write_request *kbuf; 502597d0caeSDavid Teigland sigset_t tmpsig, allsigs; 503597d0caeSDavid Teigland int error; 504597d0caeSDavid Teigland 505597d0caeSDavid Teigland #ifdef CONFIG_COMPAT 506597d0caeSDavid Teigland if (count < sizeof(struct dlm_write_request32)) 507597d0caeSDavid Teigland #else 508597d0caeSDavid Teigland if (count < sizeof(struct dlm_write_request)) 509597d0caeSDavid Teigland #endif 510597d0caeSDavid Teigland return -EINVAL; 511597d0caeSDavid Teigland 512597d0caeSDavid Teigland kbuf = kmalloc(count, GFP_KERNEL); 513597d0caeSDavid Teigland if (!kbuf) 514597d0caeSDavid Teigland return -ENOMEM; 515597d0caeSDavid Teigland 516597d0caeSDavid Teigland if (copy_from_user(kbuf, buf, count)) { 517597d0caeSDavid Teigland error = -EFAULT; 518597d0caeSDavid Teigland goto out_free; 519597d0caeSDavid Teigland } 520597d0caeSDavid Teigland 521597d0caeSDavid Teigland if (check_version(kbuf)) { 522597d0caeSDavid Teigland error = -EBADE; 523597d0caeSDavid Teigland goto out_free; 524597d0caeSDavid Teigland } 525597d0caeSDavid Teigland 526597d0caeSDavid Teigland #ifdef CONFIG_COMPAT 527597d0caeSDavid Teigland if (!kbuf->is64bit) { 528597d0caeSDavid Teigland struct dlm_write_request32 *k32buf; 529597d0caeSDavid Teigland k32buf = (struct dlm_write_request32 *)kbuf; 530597d0caeSDavid Teigland kbuf = kmalloc(count + (sizeof(struct dlm_write_request) - 531597d0caeSDavid Teigland sizeof(struct dlm_write_request32)), GFP_KERNEL); 532597d0caeSDavid Teigland if (!kbuf) 533597d0caeSDavid Teigland return -ENOMEM; 534597d0caeSDavid Teigland 535597d0caeSDavid Teigland if (proc) 536597d0caeSDavid Teigland set_bit(DLM_PROC_FLAGS_COMPAT, &proc->flags); 537*2a79289eSPatrick Caulfeld compat_input(kbuf, k32buf, 538*2a79289eSPatrick Caulfeld count - sizeof(struct dlm_write_request32)); 539597d0caeSDavid Teigland kfree(k32buf); 540597d0caeSDavid Teigland } 541597d0caeSDavid Teigland #endif 542597d0caeSDavid Teigland 543597d0caeSDavid Teigland /* do we really need this? can a write happen after a close? */ 544597d0caeSDavid Teigland if ((kbuf->cmd == DLM_USER_LOCK || kbuf->cmd == DLM_USER_UNLOCK) && 545597d0caeSDavid Teigland test_bit(DLM_PROC_FLAGS_CLOSING, &proc->flags)) 546597d0caeSDavid Teigland return -EINVAL; 547597d0caeSDavid Teigland 548597d0caeSDavid Teigland sigfillset(&allsigs); 549597d0caeSDavid Teigland sigprocmask(SIG_BLOCK, &allsigs, &tmpsig); 550597d0caeSDavid Teigland 551597d0caeSDavid Teigland error = -EINVAL; 552597d0caeSDavid Teigland 553597d0caeSDavid Teigland switch (kbuf->cmd) 554597d0caeSDavid Teigland { 555597d0caeSDavid Teigland case DLM_USER_LOCK: 556597d0caeSDavid Teigland if (!proc) { 557597d0caeSDavid Teigland log_print("no locking on control device"); 558597d0caeSDavid Teigland goto out_sig; 559597d0caeSDavid Teigland } 560597d0caeSDavid Teigland error = device_user_lock(proc, &kbuf->i.lock); 561597d0caeSDavid Teigland break; 562597d0caeSDavid Teigland 563597d0caeSDavid Teigland case DLM_USER_UNLOCK: 564597d0caeSDavid Teigland if (!proc) { 565597d0caeSDavid Teigland log_print("no locking on control device"); 566597d0caeSDavid Teigland goto out_sig; 567597d0caeSDavid Teigland } 568597d0caeSDavid Teigland error = device_user_unlock(proc, &kbuf->i.lock); 569597d0caeSDavid Teigland break; 570597d0caeSDavid Teigland 5718b4021faSDavid Teigland case DLM_USER_DEADLOCK: 5728b4021faSDavid Teigland if (!proc) { 5738b4021faSDavid Teigland log_print("no locking on control device"); 5748b4021faSDavid Teigland goto out_sig; 5758b4021faSDavid Teigland } 5768b4021faSDavid Teigland error = device_user_deadlock(proc, &kbuf->i.lock); 5778b4021faSDavid Teigland break; 5788b4021faSDavid Teigland 579597d0caeSDavid Teigland case DLM_USER_CREATE_LOCKSPACE: 580597d0caeSDavid Teigland if (proc) { 581597d0caeSDavid Teigland log_print("create/remove only on control device"); 582597d0caeSDavid Teigland goto out_sig; 583597d0caeSDavid Teigland } 584597d0caeSDavid Teigland error = device_create_lockspace(&kbuf->i.lspace); 585597d0caeSDavid Teigland break; 586597d0caeSDavid Teigland 587597d0caeSDavid Teigland case DLM_USER_REMOVE_LOCKSPACE: 588597d0caeSDavid Teigland if (proc) { 589597d0caeSDavid Teigland log_print("create/remove only on control device"); 590597d0caeSDavid Teigland goto out_sig; 591597d0caeSDavid Teigland } 592597d0caeSDavid Teigland error = device_remove_lockspace(&kbuf->i.lspace); 593597d0caeSDavid Teigland break; 594597d0caeSDavid Teigland 59572c2be77SDavid Teigland case DLM_USER_PURGE: 59672c2be77SDavid Teigland if (!proc) { 59772c2be77SDavid Teigland log_print("no locking on control device"); 59872c2be77SDavid Teigland goto out_sig; 59972c2be77SDavid Teigland } 60072c2be77SDavid Teigland error = device_user_purge(proc, &kbuf->i.purge); 60172c2be77SDavid Teigland break; 60272c2be77SDavid Teigland 603597d0caeSDavid Teigland default: 604597d0caeSDavid Teigland log_print("Unknown command passed to DLM device : %d\n", 605597d0caeSDavid Teigland kbuf->cmd); 606597d0caeSDavid Teigland } 607597d0caeSDavid Teigland 608597d0caeSDavid Teigland out_sig: 609597d0caeSDavid Teigland sigprocmask(SIG_SETMASK, &tmpsig, NULL); 610597d0caeSDavid Teigland recalc_sigpending(); 611597d0caeSDavid Teigland out_free: 612597d0caeSDavid Teigland kfree(kbuf); 613597d0caeSDavid Teigland return error; 614597d0caeSDavid Teigland } 615597d0caeSDavid Teigland 616597d0caeSDavid Teigland /* Every process that opens the lockspace device has its own "proc" structure 617597d0caeSDavid Teigland hanging off the open file that's used to keep track of locks owned by the 618597d0caeSDavid Teigland process and asts that need to be delivered to the process. */ 619597d0caeSDavid Teigland 620597d0caeSDavid Teigland static int device_open(struct inode *inode, struct file *file) 621597d0caeSDavid Teigland { 622597d0caeSDavid Teigland struct dlm_user_proc *proc; 623597d0caeSDavid Teigland struct dlm_ls *ls; 624597d0caeSDavid Teigland 625597d0caeSDavid Teigland ls = dlm_find_lockspace_device(iminor(inode)); 626597d0caeSDavid Teigland if (!ls) 627597d0caeSDavid Teigland return -ENOENT; 628597d0caeSDavid Teigland 629597d0caeSDavid Teigland proc = kzalloc(sizeof(struct dlm_user_proc), GFP_KERNEL); 630597d0caeSDavid Teigland if (!proc) { 631597d0caeSDavid Teigland dlm_put_lockspace(ls); 632597d0caeSDavid Teigland return -ENOMEM; 633597d0caeSDavid Teigland } 634597d0caeSDavid Teigland 635597d0caeSDavid Teigland proc->lockspace = ls->ls_local_handle; 636597d0caeSDavid Teigland INIT_LIST_HEAD(&proc->asts); 637597d0caeSDavid Teigland INIT_LIST_HEAD(&proc->locks); 638a1bc86e6SDavid Teigland INIT_LIST_HEAD(&proc->unlocking); 639597d0caeSDavid Teigland spin_lock_init(&proc->asts_spin); 640597d0caeSDavid Teigland spin_lock_init(&proc->locks_spin); 641597d0caeSDavid Teigland init_waitqueue_head(&proc->wait); 642597d0caeSDavid Teigland file->private_data = proc; 643597d0caeSDavid Teigland 644597d0caeSDavid Teigland return 0; 645597d0caeSDavid Teigland } 646597d0caeSDavid Teigland 647597d0caeSDavid Teigland static int device_close(struct inode *inode, struct file *file) 648597d0caeSDavid Teigland { 649597d0caeSDavid Teigland struct dlm_user_proc *proc = file->private_data; 650597d0caeSDavid Teigland struct dlm_ls *ls; 651597d0caeSDavid Teigland sigset_t tmpsig, allsigs; 652597d0caeSDavid Teigland 653597d0caeSDavid Teigland ls = dlm_find_lockspace_local(proc->lockspace); 654597d0caeSDavid Teigland if (!ls) 655597d0caeSDavid Teigland return -ENOENT; 656597d0caeSDavid Teigland 657597d0caeSDavid Teigland sigfillset(&allsigs); 658597d0caeSDavid Teigland sigprocmask(SIG_BLOCK, &allsigs, &tmpsig); 659597d0caeSDavid Teigland 660597d0caeSDavid Teigland set_bit(DLM_PROC_FLAGS_CLOSING, &proc->flags); 661597d0caeSDavid Teigland 662597d0caeSDavid Teigland dlm_clear_proc_locks(ls, proc); 663597d0caeSDavid Teigland 664597d0caeSDavid Teigland /* at this point no more lkb's should exist for this lockspace, 665597d0caeSDavid Teigland so there's no chance of dlm_user_add_ast() being called and 666597d0caeSDavid Teigland looking for lkb->ua->proc */ 667597d0caeSDavid Teigland 668597d0caeSDavid Teigland kfree(proc); 669597d0caeSDavid Teigland file->private_data = NULL; 670597d0caeSDavid Teigland 671597d0caeSDavid Teigland dlm_put_lockspace(ls); 672597d0caeSDavid Teigland dlm_put_lockspace(ls); /* for the find in device_open() */ 673597d0caeSDavid Teigland 674597d0caeSDavid Teigland /* FIXME: AUTOFREE: if this ls is no longer used do 675597d0caeSDavid Teigland device_remove_lockspace() */ 676597d0caeSDavid Teigland 677597d0caeSDavid Teigland sigprocmask(SIG_SETMASK, &tmpsig, NULL); 678597d0caeSDavid Teigland recalc_sigpending(); 679597d0caeSDavid Teigland 680597d0caeSDavid Teigland return 0; 681597d0caeSDavid Teigland } 682597d0caeSDavid Teigland 683597d0caeSDavid Teigland static int copy_result_to_user(struct dlm_user_args *ua, int compat, int type, 684597d0caeSDavid Teigland int bmode, char __user *buf, size_t count) 685597d0caeSDavid Teigland { 686597d0caeSDavid Teigland #ifdef CONFIG_COMPAT 687597d0caeSDavid Teigland struct dlm_lock_result32 result32; 688597d0caeSDavid Teigland #endif 689597d0caeSDavid Teigland struct dlm_lock_result result; 690597d0caeSDavid Teigland void *resultptr; 691597d0caeSDavid Teigland int error=0; 692597d0caeSDavid Teigland int len; 693597d0caeSDavid Teigland int struct_len; 694597d0caeSDavid Teigland 695597d0caeSDavid Teigland memset(&result, 0, sizeof(struct dlm_lock_result)); 696d7db923eSDavid Teigland result.version[0] = DLM_DEVICE_VERSION_MAJOR; 697d7db923eSDavid Teigland result.version[1] = DLM_DEVICE_VERSION_MINOR; 698d7db923eSDavid Teigland result.version[2] = DLM_DEVICE_VERSION_PATCH; 699597d0caeSDavid Teigland memcpy(&result.lksb, &ua->lksb, sizeof(struct dlm_lksb)); 700597d0caeSDavid Teigland result.user_lksb = ua->user_lksb; 701597d0caeSDavid Teigland 702597d0caeSDavid Teigland /* FIXME: dlm1 provides for the user's bastparam/addr to not be updated 703597d0caeSDavid Teigland in a conversion unless the conversion is successful. See code 704597d0caeSDavid Teigland in dlm_user_convert() for updating ua from ua_tmp. OpenVMS, though, 705597d0caeSDavid Teigland notes that a new blocking AST address and parameter are set even if 706597d0caeSDavid Teigland the conversion fails, so maybe we should just do that. */ 707597d0caeSDavid Teigland 708597d0caeSDavid Teigland if (type == AST_BAST) { 709597d0caeSDavid Teigland result.user_astaddr = ua->bastaddr; 710597d0caeSDavid Teigland result.user_astparam = ua->bastparam; 711597d0caeSDavid Teigland result.bast_mode = bmode; 712597d0caeSDavid Teigland } else { 713597d0caeSDavid Teigland result.user_astaddr = ua->castaddr; 714597d0caeSDavid Teigland result.user_astparam = ua->castparam; 715597d0caeSDavid Teigland } 716597d0caeSDavid Teigland 717597d0caeSDavid Teigland #ifdef CONFIG_COMPAT 718597d0caeSDavid Teigland if (compat) 719597d0caeSDavid Teigland len = sizeof(struct dlm_lock_result32); 720597d0caeSDavid Teigland else 721597d0caeSDavid Teigland #endif 722597d0caeSDavid Teigland len = sizeof(struct dlm_lock_result); 723597d0caeSDavid Teigland struct_len = len; 724597d0caeSDavid Teigland 725597d0caeSDavid Teigland /* copy lvb to userspace if there is one, it's been updated, and 726597d0caeSDavid Teigland the user buffer has space for it */ 727597d0caeSDavid Teigland 728597d0caeSDavid Teigland if (ua->update_user_lvb && ua->lksb.sb_lvbptr && 729597d0caeSDavid Teigland count >= len + DLM_USER_LVB_LEN) { 730597d0caeSDavid Teigland if (copy_to_user(buf+len, ua->lksb.sb_lvbptr, 731597d0caeSDavid Teigland DLM_USER_LVB_LEN)) { 732597d0caeSDavid Teigland error = -EFAULT; 733597d0caeSDavid Teigland goto out; 734597d0caeSDavid Teigland } 735597d0caeSDavid Teigland 736597d0caeSDavid Teigland result.lvb_offset = len; 737597d0caeSDavid Teigland len += DLM_USER_LVB_LEN; 738597d0caeSDavid Teigland } 739597d0caeSDavid Teigland 740597d0caeSDavid Teigland result.length = len; 741597d0caeSDavid Teigland resultptr = &result; 742597d0caeSDavid Teigland #ifdef CONFIG_COMPAT 743597d0caeSDavid Teigland if (compat) { 744597d0caeSDavid Teigland compat_output(&result, &result32); 745597d0caeSDavid Teigland resultptr = &result32; 746597d0caeSDavid Teigland } 747597d0caeSDavid Teigland #endif 748597d0caeSDavid Teigland 749597d0caeSDavid Teigland if (copy_to_user(buf, resultptr, struct_len)) 750597d0caeSDavid Teigland error = -EFAULT; 751597d0caeSDavid Teigland else 752597d0caeSDavid Teigland error = len; 753597d0caeSDavid Teigland out: 754597d0caeSDavid Teigland return error; 755597d0caeSDavid Teigland } 756597d0caeSDavid Teigland 757d7db923eSDavid Teigland static int copy_version_to_user(char __user *buf, size_t count) 758d7db923eSDavid Teigland { 759d7db923eSDavid Teigland struct dlm_device_version ver; 760d7db923eSDavid Teigland 761d7db923eSDavid Teigland memset(&ver, 0, sizeof(struct dlm_device_version)); 762d7db923eSDavid Teigland ver.version[0] = DLM_DEVICE_VERSION_MAJOR; 763d7db923eSDavid Teigland ver.version[1] = DLM_DEVICE_VERSION_MINOR; 764d7db923eSDavid Teigland ver.version[2] = DLM_DEVICE_VERSION_PATCH; 765d7db923eSDavid Teigland 766d7db923eSDavid Teigland if (copy_to_user(buf, &ver, sizeof(struct dlm_device_version))) 767d7db923eSDavid Teigland return -EFAULT; 768d7db923eSDavid Teigland return sizeof(struct dlm_device_version); 769d7db923eSDavid Teigland } 770d7db923eSDavid Teigland 771597d0caeSDavid Teigland /* a read returns a single ast described in a struct dlm_lock_result */ 772597d0caeSDavid Teigland 773597d0caeSDavid Teigland static ssize_t device_read(struct file *file, char __user *buf, size_t count, 774597d0caeSDavid Teigland loff_t *ppos) 775597d0caeSDavid Teigland { 776597d0caeSDavid Teigland struct dlm_user_proc *proc = file->private_data; 777597d0caeSDavid Teigland struct dlm_lkb *lkb; 778597d0caeSDavid Teigland struct dlm_user_args *ua; 779597d0caeSDavid Teigland DECLARE_WAITQUEUE(wait, current); 780597d0caeSDavid Teigland int error, type=0, bmode=0, removed = 0; 781597d0caeSDavid Teigland 782d7db923eSDavid Teigland if (count == sizeof(struct dlm_device_version)) { 783d7db923eSDavid Teigland error = copy_version_to_user(buf, count); 784d7db923eSDavid Teigland return error; 785d7db923eSDavid Teigland } 786d7db923eSDavid Teigland 787d7db923eSDavid Teigland if (!proc) { 788d7db923eSDavid Teigland log_print("non-version read from control device %zu", count); 789d7db923eSDavid Teigland return -EINVAL; 790d7db923eSDavid Teigland } 791d7db923eSDavid Teigland 792597d0caeSDavid Teigland #ifdef CONFIG_COMPAT 793597d0caeSDavid Teigland if (count < sizeof(struct dlm_lock_result32)) 794597d0caeSDavid Teigland #else 795597d0caeSDavid Teigland if (count < sizeof(struct dlm_lock_result)) 796597d0caeSDavid Teigland #endif 797597d0caeSDavid Teigland return -EINVAL; 798597d0caeSDavid Teigland 799597d0caeSDavid Teigland /* do we really need this? can a read happen after a close? */ 800597d0caeSDavid Teigland if (test_bit(DLM_PROC_FLAGS_CLOSING, &proc->flags)) 801597d0caeSDavid Teigland return -EINVAL; 802597d0caeSDavid Teigland 803597d0caeSDavid Teigland spin_lock(&proc->asts_spin); 804597d0caeSDavid Teigland if (list_empty(&proc->asts)) { 805597d0caeSDavid Teigland if (file->f_flags & O_NONBLOCK) { 806597d0caeSDavid Teigland spin_unlock(&proc->asts_spin); 807597d0caeSDavid Teigland return -EAGAIN; 808597d0caeSDavid Teigland } 809597d0caeSDavid Teigland 810597d0caeSDavid Teigland add_wait_queue(&proc->wait, &wait); 811597d0caeSDavid Teigland 812597d0caeSDavid Teigland repeat: 813597d0caeSDavid Teigland set_current_state(TASK_INTERRUPTIBLE); 814597d0caeSDavid Teigland if (list_empty(&proc->asts) && !signal_pending(current)) { 815597d0caeSDavid Teigland spin_unlock(&proc->asts_spin); 816597d0caeSDavid Teigland schedule(); 817597d0caeSDavid Teigland spin_lock(&proc->asts_spin); 818597d0caeSDavid Teigland goto repeat; 819597d0caeSDavid Teigland } 820597d0caeSDavid Teigland set_current_state(TASK_RUNNING); 821597d0caeSDavid Teigland remove_wait_queue(&proc->wait, &wait); 822597d0caeSDavid Teigland 823597d0caeSDavid Teigland if (signal_pending(current)) { 824597d0caeSDavid Teigland spin_unlock(&proc->asts_spin); 825597d0caeSDavid Teigland return -ERESTARTSYS; 826597d0caeSDavid Teigland } 827597d0caeSDavid Teigland } 828597d0caeSDavid Teigland 829597d0caeSDavid Teigland /* there may be both completion and blocking asts to return for 830597d0caeSDavid Teigland the lkb, don't remove lkb from asts list unless no asts remain */ 831597d0caeSDavid Teigland 832597d0caeSDavid Teigland lkb = list_entry(proc->asts.next, struct dlm_lkb, lkb_astqueue); 833597d0caeSDavid Teigland 834597d0caeSDavid Teigland if (lkb->lkb_ast_type & AST_COMP) { 835597d0caeSDavid Teigland lkb->lkb_ast_type &= ~AST_COMP; 836597d0caeSDavid Teigland type = AST_COMP; 837597d0caeSDavid Teigland } else if (lkb->lkb_ast_type & AST_BAST) { 838597d0caeSDavid Teigland lkb->lkb_ast_type &= ~AST_BAST; 839597d0caeSDavid Teigland type = AST_BAST; 840597d0caeSDavid Teigland bmode = lkb->lkb_bastmode; 841597d0caeSDavid Teigland } 842597d0caeSDavid Teigland 843597d0caeSDavid Teigland if (!lkb->lkb_ast_type) { 844597d0caeSDavid Teigland list_del(&lkb->lkb_astqueue); 845597d0caeSDavid Teigland removed = 1; 846597d0caeSDavid Teigland } 847597d0caeSDavid Teigland spin_unlock(&proc->asts_spin); 848597d0caeSDavid Teigland 849597d0caeSDavid Teigland ua = (struct dlm_user_args *)lkb->lkb_astparam; 850597d0caeSDavid Teigland error = copy_result_to_user(ua, 851597d0caeSDavid Teigland test_bit(DLM_PROC_FLAGS_COMPAT, &proc->flags), 852597d0caeSDavid Teigland type, bmode, buf, count); 853597d0caeSDavid Teigland 854597d0caeSDavid Teigland /* removes reference for the proc->asts lists added by 855597d0caeSDavid Teigland dlm_user_add_ast() and may result in the lkb being freed */ 856597d0caeSDavid Teigland if (removed) 857597d0caeSDavid Teigland dlm_put_lkb(lkb); 858597d0caeSDavid Teigland 859597d0caeSDavid Teigland return error; 860597d0caeSDavid Teigland } 861597d0caeSDavid Teigland 862597d0caeSDavid Teigland static unsigned int device_poll(struct file *file, poll_table *wait) 863597d0caeSDavid Teigland { 864597d0caeSDavid Teigland struct dlm_user_proc *proc = file->private_data; 865597d0caeSDavid Teigland 866597d0caeSDavid Teigland poll_wait(file, &proc->wait, wait); 867597d0caeSDavid Teigland 868597d0caeSDavid Teigland spin_lock(&proc->asts_spin); 869597d0caeSDavid Teigland if (!list_empty(&proc->asts)) { 870597d0caeSDavid Teigland spin_unlock(&proc->asts_spin); 871597d0caeSDavid Teigland return POLLIN | POLLRDNORM; 872597d0caeSDavid Teigland } 873597d0caeSDavid Teigland spin_unlock(&proc->asts_spin); 874597d0caeSDavid Teigland return 0; 875597d0caeSDavid Teigland } 876597d0caeSDavid Teigland 877597d0caeSDavid Teigland static int ctl_device_open(struct inode *inode, struct file *file) 878597d0caeSDavid Teigland { 879597d0caeSDavid Teigland file->private_data = NULL; 880597d0caeSDavid Teigland return 0; 881597d0caeSDavid Teigland } 882597d0caeSDavid Teigland 883597d0caeSDavid Teigland static int ctl_device_close(struct inode *inode, struct file *file) 884597d0caeSDavid Teigland { 885597d0caeSDavid Teigland return 0; 886597d0caeSDavid Teigland } 887597d0caeSDavid Teigland 88800977a59SArjan van de Ven static const struct file_operations device_fops = { 889597d0caeSDavid Teigland .open = device_open, 890597d0caeSDavid Teigland .release = device_close, 891597d0caeSDavid Teigland .read = device_read, 892597d0caeSDavid Teigland .write = device_write, 893597d0caeSDavid Teigland .poll = device_poll, 894597d0caeSDavid Teigland .owner = THIS_MODULE, 895597d0caeSDavid Teigland }; 896597d0caeSDavid Teigland 89700977a59SArjan van de Ven static const struct file_operations ctl_device_fops = { 898597d0caeSDavid Teigland .open = ctl_device_open, 899597d0caeSDavid Teigland .release = ctl_device_close, 900d7db923eSDavid Teigland .read = device_read, 901597d0caeSDavid Teigland .write = device_write, 902597d0caeSDavid Teigland .owner = THIS_MODULE, 903597d0caeSDavid Teigland }; 904597d0caeSDavid Teigland 905597d0caeSDavid Teigland int dlm_user_init(void) 906597d0caeSDavid Teigland { 907597d0caeSDavid Teigland int error; 908597d0caeSDavid Teigland 909597d0caeSDavid Teigland ctl_device.name = "dlm-control"; 910597d0caeSDavid Teigland ctl_device.fops = &ctl_device_fops; 911597d0caeSDavid Teigland ctl_device.minor = MISC_DYNAMIC_MINOR; 912597d0caeSDavid Teigland 913597d0caeSDavid Teigland error = misc_register(&ctl_device); 914597d0caeSDavid Teigland if (error) 915597d0caeSDavid Teigland log_print("misc_register failed for control device"); 916597d0caeSDavid Teigland 917597d0caeSDavid Teigland return error; 918597d0caeSDavid Teigland } 919597d0caeSDavid Teigland 920597d0caeSDavid Teigland void dlm_user_exit(void) 921597d0caeSDavid Teigland { 922597d0caeSDavid Teigland misc_deregister(&ctl_device); 923597d0caeSDavid Teigland } 924597d0caeSDavid Teigland 925