A general purpose distributed lock manager for kernel or userspace
applications.
-config DLM_DEVICE
- tristate "DLM device for userspace access"
- depends on DLM
- help
- This module creates a misc device through which the dlm lockspace
- and locking functions become available to userspace applications
- (usually through the libdlm library).
-
config DLM_DEBUG
bool "DLM debugging"
depends on DLM
obj-$(CONFIG_DLM) += dlm.o
-obj-$(CONFIG_DLM_DEVICE) += dlm_device.o
-
dlm-y := ast.o \
config.o \
dir.o \
recover.o \
recoverd.o \
requestqueue.o \
+ user.o \
util.o
dlm-$(CONFIG_DLM_DEBUG) += debug_fs.o
-dlm_device-y := device.o
#include "dlm_internal.h"
#include "lock.h"
-#include "ast.h"
+#include "user.h"
#define WAKE_ASTS 0
void dlm_add_ast(struct dlm_lkb *lkb, int type)
{
+ if (lkb->lkb_flags & DLM_IFL_USER) {
+ dlm_user_add_ast(lkb, type);
+ return;
+ }
+
spin_lock(&ast_queue_lock);
if (!(lkb->lkb_ast_type & (AST_COMP | AST_BAST))) {
kref_get(&lkb->lkb_ref);
+++ /dev/null
-/******************************************************************************
-*******************************************************************************
-**
-** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
-** Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
-**
-** This copyrighted material is made available to anyone wishing to use,
-** modify, copy, or redistribute it subject to the terms and conditions
-** of the GNU General Public License v.2.
-**
-*******************************************************************************
-******************************************************************************/
-
-/*
- * device.c
- *
- * This is the userland interface to the DLM.
- *
- * The locking is done via a misc char device (find the
- * registered minor number in /proc/misc).
- *
- * User code should not use this interface directly but
- * call the library routines in libdlm.a instead.
- *
- */
-
-#include <linux/miscdevice.h>
-#include <linux/init.h>
-#include <linux/wait.h>
-#include <linux/module.h>
-#include <linux/file.h>
-#include <linux/fs.h>
-#include <linux/poll.h>
-#include <linux/signal.h>
-#include <linux/spinlock.h>
-#include <linux/idr.h>
-
-#include <linux/dlm.h>
-#include <linux/dlm_device.h>
-
-#include "lvb_table.h"
-
-static struct file_operations _dlm_fops;
-static const char *name_prefix="dlm";
-static struct list_head user_ls_list;
-static struct mutex user_ls_lock;
-
-/* Flags in li_flags */
-#define LI_FLAG_COMPLETE 1
-#define LI_FLAG_FIRSTLOCK 2
-#define LI_FLAG_PERSISTENT 3
-#define LI_FLAG_ONLIST 4
-
-/* flags in ls_flags*/
-#define LS_FLAG_DELETED 1
-#define LS_FLAG_AUTOFREE 2
-
-/* flags in ls_flags*/
-#define FI_FLAG_OPEN 1
-#define FI_FLAG_COMPAT 2
-
-#define LOCKINFO_MAGIC 0x53595324
-
-struct lock_info {
- uint32_t li_magic;
- uint8_t li_cmd;
- int8_t li_grmode;
- int8_t li_rqmode;
- struct dlm_lksb li_lksb;
- wait_queue_head_t li_waitq;
- unsigned long li_flags;
- void __user *li_castparam;
- void __user *li_castaddr;
- void __user *li_bastparam;
- void __user *li_bastaddr;
- void __user *li_pend_bastparam;
- void __user *li_pend_bastaddr;
- struct list_head li_ownerqueue;
- struct file_info *li_file;
- struct dlm_lksb __user *li_user_lksb;
- struct completion li_firstcomp;
-};
-
-/* A queued AST no less */
-struct ast_info {
- struct dlm_lock_result result;
- struct list_head list;
- uint32_t lvb_updated;
- uint32_t progress; /* How much has been read */
-};
-
-/* One of these per userland lockspace */
-struct user_ls {
- void *ls_lockspace;
- atomic_t ls_refcnt;
- long ls_flags;
-
- /* Lock infos are stored in here indexed by lock ID */
- struct idr lockinfo_idr;
- rwlock_t lockinfo_lock;
-
- /* Passed into misc_register() */
- struct miscdevice ls_miscinfo;
- struct list_head ls_list;
-};
-
-/* misc_device info for the control device */
-static struct miscdevice ctl_device;
-
-/*
- * Stuff we hang off the file struct.
- * The first two are to cope with unlocking all the
- * locks help by a process when it dies.
- */
-struct file_info {
- struct list_head fi_li_list; /* List of active lock_infos */
- spinlock_t fi_li_lock;
- struct list_head fi_ast_list; /* Queue of ASTs to be delivered */
- spinlock_t fi_ast_lock;
- wait_queue_head_t fi_wait;
- struct user_ls *fi_ls;
- atomic_t fi_refcnt; /* Number of users */
- unsigned long fi_flags;
-};
-
-#ifdef CONFIG_COMPAT
-
-struct dlm_lock_params32 {
- __u8 mode;
- __u8 namelen;
- __u16 flags;
- __u32 lkid;
- __u32 parent;
-
- __u32 castparam;
- __u32 castaddr;
- __u32 bastparam;
- __u32 bastaddr;
- __u32 lksb;
-
- char lvb[DLM_USER_LVB_LEN];
- char name[0];
-};
-
-struct dlm_write_request32 {
- __u32 version[3];
- __u8 cmd;
- __u8 is64bit;
- __u8 unused[2];
-
- union {
- struct dlm_lock_params32 lock;
- struct dlm_lspace_params lspace;
- } i;
-};
-
-struct dlm_lksb32 {
- __u32 sb_status;
- __u32 sb_lkid;
- __u8 sb_flags;
- __u32 sb_lvbptr;
-};
-
-struct dlm_lock_result32 {
- __u32 length;
- __u32 user_astaddr;
- __u32 user_astparam;
- __u32 user_lksb;
- struct dlm_lksb32 lksb;
- __u8 bast_mode;
- __u8 unused[3];
- /* Offsets may be zero if no data is present */
- __u32 lvb_offset;
-};
-
-
-static void compat_input(struct dlm_write_request *kparams, struct dlm_write_request32 *k32params)
-{
-
- kparams->version[0] = k32params->version[0];
- kparams->version[1] = k32params->version[1];
- kparams->version[2] = k32params->version[2];
-
- kparams->cmd = k32params->cmd;
- kparams->is64bit = k32params->is64bit;
- if (kparams->cmd == DLM_USER_CREATE_LOCKSPACE ||
- kparams->cmd == DLM_USER_REMOVE_LOCKSPACE) {
-
- kparams->i.lspace.flags = k32params->i.lspace.flags;
- kparams->i.lspace.minor = k32params->i.lspace.minor;
- strcpy(kparams->i.lspace.name, k32params->i.lspace.name);
- }
- else {
- kparams->i.lock.mode = k32params->i.lock.mode;
- kparams->i.lock.namelen = k32params->i.lock.namelen;
- kparams->i.lock.flags = k32params->i.lock.flags;
- kparams->i.lock.lkid = k32params->i.lock.lkid;
- kparams->i.lock.parent = k32params->i.lock.parent;
- kparams->i.lock.castparam = (void *)(long)k32params->i.lock.castparam;
- kparams->i.lock.castaddr = (void *)(long)k32params->i.lock.castaddr;
- kparams->i.lock.bastparam = (void *)(long)k32params->i.lock.bastparam;
- kparams->i.lock.bastaddr = (void *)(long)k32params->i.lock.bastaddr;
- kparams->i.lock.lksb = (void *)(long)k32params->i.lock.lksb;
- memcpy(kparams->i.lock.lvb, k32params->i.lock.lvb, DLM_USER_LVB_LEN);
- memcpy(kparams->i.lock.name, k32params->i.lock.name, kparams->i.lock.namelen);
- }
-}
-
-void compat_output(struct dlm_lock_result *res, struct dlm_lock_result32 *res32)
-{
- res32->length = res->length - (sizeof(struct dlm_lock_result) - sizeof(struct dlm_lock_result32));
- res32->user_astaddr = (__u32)(long)res->user_astaddr;
- res32->user_astparam = (__u32)(long)res->user_astparam;
- res32->user_lksb = (__u32)(long)res->user_lksb;
- res32->bast_mode = res->bast_mode;
-
- res32->lvb_offset = res->lvb_offset;
- res32->length = res->length;
-
- res32->lksb.sb_status = res->lksb.sb_status;
- res32->lksb.sb_flags = res->lksb.sb_flags;
- res32->lksb.sb_lkid = res->lksb.sb_lkid;
- res32->lksb.sb_lvbptr = (__u32)(long)res->lksb.sb_lvbptr;
-}
-#endif
-
-
-/* get and put ops for file_info.
- Actually I don't really like "get" and "put", but everyone
- else seems to use them and I can't think of anything
- nicer at the moment */
-static void get_file_info(struct file_info *f)
-{
- atomic_inc(&f->fi_refcnt);
-}
-
-static void put_file_info(struct file_info *f)
-{
- if (atomic_dec_and_test(&f->fi_refcnt))
- kfree(f);
-}
-
-static void release_lockinfo(struct user_ls *ls, struct lock_info *li)
-{
- put_file_info(li->li_file);
-
- write_lock(&ls->lockinfo_lock);
- idr_remove(&ls->lockinfo_idr, li->li_lksb.sb_lkid);
- write_unlock(&ls->lockinfo_lock);
-
- if (li->li_lksb.sb_lvbptr)
- kfree(li->li_lksb.sb_lvbptr);
- kfree(li);
-
- module_put(THIS_MODULE);
-}
-
-static struct lock_info *get_lockinfo(struct user_ls *ls, uint32_t lockid)
-{
- struct lock_info *li;
-
- read_lock(&ls->lockinfo_lock);
- li = idr_find(&ls->lockinfo_idr, lockid);
- read_unlock(&ls->lockinfo_lock);
-
- return li;
-}
-
-static int add_lockinfo(struct user_ls *ls, struct lock_info *li)
-{
- int n;
- int r;
- int ret = -EINVAL;
-
- write_lock(&ls->lockinfo_lock);
-
- if (idr_find(&ls->lockinfo_idr, li->li_lksb.sb_lkid))
- goto out_up;
-
- ret = -ENOMEM;
- r = idr_pre_get(&ls->lockinfo_idr, GFP_KERNEL);
- if (!r)
- goto out_up;
-
- r = idr_get_new_above(&ls->lockinfo_idr, li, li->li_lksb.sb_lkid, &n);
- if (r)
- goto out_up;
-
- if (n != li->li_lksb.sb_lkid) {
- idr_remove(&ls->lockinfo_idr, n);
- goto out_up;
- }
-
- ret = 0;
-
- out_up:
- write_unlock(&ls->lockinfo_lock);
-
- return ret;
-}
-
-
-static struct user_ls *__find_lockspace(int minor)
-{
- struct user_ls *lsinfo;
-
- list_for_each_entry(lsinfo, &user_ls_list, ls_list) {
- if (lsinfo->ls_miscinfo.minor == minor)
- return lsinfo;
- }
- return NULL;
-}
-
-/* Find a lockspace struct given the device minor number */
-static struct user_ls *find_lockspace(int minor)
-{
- struct user_ls *lsinfo;
-
- mutex_lock(&user_ls_lock);
- lsinfo = __find_lockspace(minor);
- mutex_unlock(&user_ls_lock);
-
- return lsinfo;
-}
-
-static void add_lockspace_to_list(struct user_ls *lsinfo)
-{
- mutex_lock(&user_ls_lock);
- list_add(&lsinfo->ls_list, &user_ls_list);
- mutex_unlock(&user_ls_lock);
-}
-
-/* Register a lockspace with the DLM and create a misc
- device for userland to access it */
-static int register_lockspace(char *name, struct user_ls **ls, int flags)
-{
- struct user_ls *newls;
- int status;
- int namelen;
-
- namelen = strlen(name)+strlen(name_prefix)+2;
-
- newls = kzalloc(sizeof(struct user_ls), GFP_KERNEL);
- if (!newls)
- return -ENOMEM;
-
- newls->ls_miscinfo.name = kzalloc(namelen, GFP_KERNEL);
- if (!newls->ls_miscinfo.name) {
- kfree(newls);
- return -ENOMEM;
- }
-
- status = dlm_new_lockspace(name, strlen(name), &newls->ls_lockspace, 0,
- DLM_USER_LVB_LEN);
- if (status != 0) {
- kfree(newls->ls_miscinfo.name);
- kfree(newls);
- return status;
- }
-
- idr_init(&newls->lockinfo_idr);
- rwlock_init(&newls->lockinfo_lock);
-
- snprintf((char*)newls->ls_miscinfo.name, namelen, "%s_%s",
- name_prefix, name);
-
- newls->ls_miscinfo.fops = &_dlm_fops;
- newls->ls_miscinfo.minor = MISC_DYNAMIC_MINOR;
-
- status = misc_register(&newls->ls_miscinfo);
- if (status) {
- printk(KERN_ERR "dlm: misc register failed for %s\n", name);
- dlm_release_lockspace(newls->ls_lockspace, 0);
- kfree(newls->ls_miscinfo.name);
- kfree(newls);
- return status;
- }
-
- if (flags & DLM_USER_LSFLG_AUTOFREE)
- set_bit(LS_FLAG_AUTOFREE, &newls->ls_flags);
-
- add_lockspace_to_list(newls);
- *ls = newls;
- return 0;
-}
-
-/* Called with the user_ls_lock mutex held */
-static int unregister_lockspace(struct user_ls *lsinfo, int force)
-{
- int status;
-
- status = dlm_release_lockspace(lsinfo->ls_lockspace, force);
- if (status)
- return status;
-
- status = misc_deregister(&lsinfo->ls_miscinfo);
- if (status)
- return status;
-
- list_del(&lsinfo->ls_list);
- set_bit(LS_FLAG_DELETED, &lsinfo->ls_flags);
- lsinfo->ls_lockspace = NULL;
- if (atomic_read(&lsinfo->ls_refcnt) == 0) {
- kfree(lsinfo->ls_miscinfo.name);
- kfree(lsinfo);
- }
-
- return 0;
-}
-
-/* Add it to userland's AST queue */
-static void add_to_astqueue(struct lock_info *li, void *astaddr, void *astparam,
- int lvb_updated)
-{
- struct ast_info *ast = kzalloc(sizeof(struct ast_info), GFP_KERNEL);
- if (!ast)
- return;
-
- ast->result.user_astparam = astparam;
- ast->result.user_astaddr = astaddr;
- ast->result.user_lksb = li->li_user_lksb;
- memcpy(&ast->result.lksb, &li->li_lksb, sizeof(struct dlm_lksb));
- ast->lvb_updated = lvb_updated;
-
- spin_lock(&li->li_file->fi_ast_lock);
- list_add_tail(&ast->list, &li->li_file->fi_ast_list);
- spin_unlock(&li->li_file->fi_ast_lock);
- wake_up_interruptible(&li->li_file->fi_wait);
-}
-
-static void bast_routine(void *param, int mode)
-{
- struct lock_info *li = param;
-
- if (li && li->li_bastaddr)
- add_to_astqueue(li, li->li_bastaddr, li->li_bastparam, 0);
-}
-
-/*
- * This is the kernel's AST routine.
- * All lock, unlock & query operations complete here.
- * The only syncronous ops are those done during device close.
- */
-static void ast_routine(void *param)
-{
- struct lock_info *li = param;
-
- /* Param may be NULL if a persistent lock is unlocked by someone else */
- if (!li)
- return;
-
- /* If this is a succesful conversion then activate the blocking ast
- * args from the conversion request */
- if (!test_bit(LI_FLAG_FIRSTLOCK, &li->li_flags) &&
- li->li_lksb.sb_status == 0) {
-
- li->li_bastparam = li->li_pend_bastparam;
- li->li_bastaddr = li->li_pend_bastaddr;
- li->li_pend_bastaddr = NULL;
- }
-
- /* If it's an async request then post data to the user's AST queue. */
- if (li->li_castaddr) {
- int lvb_updated = 0;
-
- /* See if the lvb has been updated */
- if (dlm_lvb_operations[li->li_grmode+1][li->li_rqmode+1] == 1)
- lvb_updated = 1;
-
- if (li->li_lksb.sb_status == 0)
- li->li_grmode = li->li_rqmode;
-
- /* Only queue AST if the device is still open */
- if (test_bit(FI_FLAG_OPEN, &li->li_file->fi_flags))
- add_to_astqueue(li, li->li_castaddr, li->li_castparam,
- lvb_updated);
-
- /* If it's a new lock operation that failed, then
- * remove it from the owner queue and free the
- * lock_info.
- */
- if (test_and_clear_bit(LI_FLAG_FIRSTLOCK, &li->li_flags) &&
- li->li_lksb.sb_status != 0) {
-
- /* Wait till dlm_lock() has finished */
- wait_for_completion(&li->li_firstcomp);
-
- spin_lock(&li->li_file->fi_li_lock);
- list_del(&li->li_ownerqueue);
- clear_bit(LI_FLAG_ONLIST, &li->li_flags);
- spin_unlock(&li->li_file->fi_li_lock);
- release_lockinfo(li->li_file->fi_ls, li);
- return;
- }
- /* Free unlocks & queries */
- if (li->li_lksb.sb_status == -DLM_EUNLOCK ||
- li->li_cmd == DLM_USER_QUERY) {
- release_lockinfo(li->li_file->fi_ls, li);
- }
- } else {
- /* Synchronous request, just wake up the caller */
- set_bit(LI_FLAG_COMPLETE, &li->li_flags);
- wake_up_interruptible(&li->li_waitq);
- }
-}
-
-/*
- * Wait for the lock op to complete and return the status.
- */
-static int wait_for_ast(struct lock_info *li)
-{
- /* Wait for the AST routine to complete */
- set_task_state(current, TASK_INTERRUPTIBLE);
- while (!test_bit(LI_FLAG_COMPLETE, &li->li_flags))
- schedule();
-
- set_task_state(current, TASK_RUNNING);
-
- return li->li_lksb.sb_status;
-}
-
-
-/* Open on control device */
-static int dlm_ctl_open(struct inode *inode, struct file *file)
-{
- file->private_data = NULL;
- return 0;
-}
-
-/* Close on control device */
-static int dlm_ctl_close(struct inode *inode, struct file *file)
-{
- return 0;
-}
-
-/* Open on lockspace device */
-static int dlm_open(struct inode *inode, struct file *file)
-{
- struct file_info *f;
- struct user_ls *lsinfo;
-
- lsinfo = find_lockspace(iminor(inode));
- if (!lsinfo)
- return -ENOENT;
-
- f = kzalloc(sizeof(struct file_info), GFP_KERNEL);
- if (!f)
- return -ENOMEM;
-
- atomic_inc(&lsinfo->ls_refcnt);
- INIT_LIST_HEAD(&f->fi_li_list);
- INIT_LIST_HEAD(&f->fi_ast_list);
- spin_lock_init(&f->fi_li_lock);
- spin_lock_init(&f->fi_ast_lock);
- init_waitqueue_head(&f->fi_wait);
- f->fi_ls = lsinfo;
- f->fi_flags = 0;
- get_file_info(f);
- set_bit(FI_FLAG_OPEN, &f->fi_flags);
-
- file->private_data = f;
-
- return 0;
-}
-
-/* Check the user's version matches ours */
-static int check_version(struct dlm_write_request *req)
-{
- if (req->version[0] != DLM_DEVICE_VERSION_MAJOR ||
- (req->version[0] == DLM_DEVICE_VERSION_MAJOR &&
- req->version[1] > DLM_DEVICE_VERSION_MINOR)) {
-
- printk(KERN_DEBUG "dlm: process %s (%d) version mismatch "
- "user (%d.%d.%d) kernel (%d.%d.%d)\n",
- current->comm,
- current->pid,
- req->version[0],
- req->version[1],
- req->version[2],
- DLM_DEVICE_VERSION_MAJOR,
- DLM_DEVICE_VERSION_MINOR,
- DLM_DEVICE_VERSION_PATCH);
- return -EINVAL;
- }
- return 0;
-}
-
-/* Close on lockspace device */
-static int dlm_close(struct inode *inode, struct file *file)
-{
- struct file_info *f = file->private_data;
- struct lock_info li;
- struct lock_info *old_li, *safe;
- sigset_t tmpsig;
- sigset_t allsigs;
- struct user_ls *lsinfo;
- DECLARE_WAITQUEUE(wq, current);
-
- lsinfo = find_lockspace(iminor(inode));
- if (!lsinfo)
- return -ENOENT;
-
- /* Mark this closed so that ASTs will not be delivered any more */
- clear_bit(FI_FLAG_OPEN, &f->fi_flags);
-
- /* Block signals while we are doing this */
- sigfillset(&allsigs);
- sigprocmask(SIG_BLOCK, &allsigs, &tmpsig);
-
- /* We use our own lock_info struct here, so that any
- * outstanding "real" ASTs will be delivered with the
- * corresponding "real" params, thus freeing the lock_info
- * that belongs the lock. This catches the corner case where
- * a lock is BUSY when we try to unlock it here
- */
- memset(&li, 0, sizeof(li));
- clear_bit(LI_FLAG_COMPLETE, &li.li_flags);
- init_waitqueue_head(&li.li_waitq);
- add_wait_queue(&li.li_waitq, &wq);
-
- /*
- * Free any outstanding locks, they are on the
- * list in LIFO order so there should be no problems
- * about unlocking parents before children.
- */
- list_for_each_entry_safe(old_li, safe, &f->fi_li_list, li_ownerqueue) {
- int status;
- int flags = 0;
-
- /* Don't unlock persistent locks, just mark them orphaned */
- if (test_bit(LI_FLAG_PERSISTENT, &old_li->li_flags)) {
- list_del(&old_li->li_ownerqueue);
-
- /* Update master copy */
- /* TODO: Check locking core updates the local and
- remote ORPHAN flags */
- li.li_lksb.sb_lkid = old_li->li_lksb.sb_lkid;
- status = dlm_lock(f->fi_ls->ls_lockspace,
- old_li->li_grmode, &li.li_lksb,
- DLM_LKF_CONVERT|DLM_LKF_ORPHAN,
- NULL, 0, 0, ast_routine, NULL, NULL);
- if (status != 0)
- printk("dlm: Error orphaning lock %x: %d\n",
- old_li->li_lksb.sb_lkid, status);
-
- /* But tidy our references in it */
- release_lockinfo(old_li->li_file->fi_ls, old_li);
- continue;
- }
-
- clear_bit(LI_FLAG_COMPLETE, &li.li_flags);
-
- flags = DLM_LKF_FORCEUNLOCK;
- if (old_li->li_grmode >= DLM_LOCK_PW)
- flags |= DLM_LKF_IVVALBLK;
-
- status = dlm_unlock(f->fi_ls->ls_lockspace,
- old_li->li_lksb.sb_lkid, flags,
- &li.li_lksb, &li);
-
- /* Must wait for it to complete as the next lock could be its
- * parent */
- if (status == 0)
- wait_for_ast(&li);
-
- /* Unlock suceeded, free the lock_info struct. */
- if (status == 0)
- release_lockinfo(old_li->li_file->fi_ls, old_li);
- }
-
- remove_wait_queue(&li.li_waitq, &wq);
-
- /*
- * If this is the last reference to the lockspace
- * then free the struct. If it's an AUTOFREE lockspace
- * then free the whole thing.
- */
- mutex_lock(&user_ls_lock);
- if (atomic_dec_and_test(&lsinfo->ls_refcnt)) {
-
- if (lsinfo->ls_lockspace) {
- if (test_bit(LS_FLAG_AUTOFREE, &lsinfo->ls_flags)) {
- unregister_lockspace(lsinfo, 1);
- }
- } else {
- kfree(lsinfo->ls_miscinfo.name);
- kfree(lsinfo);
- }
- }
- mutex_unlock(&user_ls_lock);
- put_file_info(f);
-
- /* Restore signals */
- sigprocmask(SIG_SETMASK, &tmpsig, NULL);
- recalc_sigpending();
-
- return 0;
-}
-
-static int do_user_create_lockspace(struct file_info *fi, uint8_t cmd,
- struct dlm_lspace_params *kparams)
-{
- int status;
- struct user_ls *lsinfo;
-
- if (!capable(CAP_SYS_ADMIN))
- return -EPERM;
-
- status = register_lockspace(kparams->name, &lsinfo, kparams->flags);
-
- /* If it succeeded then return the minor number */
- if (status == 0)
- status = lsinfo->ls_miscinfo.minor;
-
- return status;
-}
-
-static int do_user_remove_lockspace(struct file_info *fi, uint8_t cmd,
- struct dlm_lspace_params *kparams)
-{
- int status;
- int force = 1;
- struct user_ls *lsinfo;
-
- if (!capable(CAP_SYS_ADMIN))
- return -EPERM;
-
- mutex_lock(&user_ls_lock);
- lsinfo = __find_lockspace(kparams->minor);
- if (!lsinfo) {
- mutex_unlock(&user_ls_lock);
- return -EINVAL;
- }
-
- if (kparams->flags & DLM_USER_LSFLG_FORCEFREE)
- force = 3;
-
- status = unregister_lockspace(lsinfo, force);
- mutex_unlock(&user_ls_lock);
-
- return status;
-}
-
-/* Read call, might block if no ASTs are waiting.
- * It will only ever return one message at a time, regardless
- * of how many are pending.
- */
-static ssize_t dlm_read(struct file *file, char __user *buffer, size_t count,
- loff_t *ppos)
-{
- struct file_info *fi = file->private_data;
- struct ast_info *ast;
- void *data;
- int data_size;
- int struct_size;
- int offset;
- DECLARE_WAITQUEUE(wait, current);
-#ifdef CONFIG_COMPAT
- struct dlm_lock_result32 result32;
-
- if (count < sizeof(struct dlm_lock_result32))
-#else
- if (count < sizeof(struct dlm_lock_result))
-#endif
- return -EINVAL;
-
- spin_lock(&fi->fi_ast_lock);
- if (list_empty(&fi->fi_ast_list)) {
-
- /* No waiting ASTs.
- * Return EOF if the lockspace been deleted.
- */
- if (test_bit(LS_FLAG_DELETED, &fi->fi_ls->ls_flags))
- return 0;
-
- if (file->f_flags & O_NONBLOCK) {
- spin_unlock(&fi->fi_ast_lock);
- return -EAGAIN;
- }
-
- add_wait_queue(&fi->fi_wait, &wait);
-
- repeat:
- set_current_state(TASK_INTERRUPTIBLE);
- if (list_empty(&fi->fi_ast_list) &&
- !signal_pending(current)) {
-
- spin_unlock(&fi->fi_ast_lock);
- schedule();
- spin_lock(&fi->fi_ast_lock);
- goto repeat;
- }
-
- current->state = TASK_RUNNING;
- remove_wait_queue(&fi->fi_wait, &wait);
-
- if (signal_pending(current)) {
- spin_unlock(&fi->fi_ast_lock);
- return -ERESTARTSYS;
- }
- }
-
- ast = list_entry(fi->fi_ast_list.next, struct ast_info, list);
- list_del(&ast->list);
- spin_unlock(&fi->fi_ast_lock);
-
- /* Work out the size of the returned data */
-#ifdef CONFIG_COMPAT
- if (test_bit(FI_FLAG_COMPAT, &fi->fi_flags)) {
- data_size = struct_size = sizeof(struct dlm_lock_result32);
- data = &result32;
- }
- else
-#endif
- {
- data_size = struct_size = sizeof(struct dlm_lock_result);
- data = &ast->result;
- }
- if (ast->lvb_updated && ast->result.lksb.sb_lvbptr)
- data_size += DLM_USER_LVB_LEN;
-
- offset = struct_size;
-
- /* Room for the extended data ? */
- if (count >= data_size) {
-
- if (ast->lvb_updated && ast->result.lksb.sb_lvbptr) {
- if (copy_to_user(buffer+offset,
- ast->result.lksb.sb_lvbptr,
- DLM_USER_LVB_LEN))
- return -EFAULT;
- ast->result.lvb_offset = offset;
- offset += DLM_USER_LVB_LEN;
- }
- }
-
- ast->result.length = data_size;
-
-#ifdef CONFIG_COMPAT
- compat_output(&ast->result, &result32);
-#endif
-
- /* Copy the header now it has all the offsets in it */
- if (copy_to_user(buffer, data, struct_size))
- offset = -EFAULT;
-
- /* If we only returned a header and there's more to come then put it
- back on the list */
- if (count < data_size) {
- spin_lock(&fi->fi_ast_lock);
- list_add(&ast->list, &fi->fi_ast_list);
- spin_unlock(&fi->fi_ast_lock);
- } else
- kfree(ast);
- return offset;
-}
-
-static unsigned int dlm_poll(struct file *file, poll_table *wait)
-{
- struct file_info *fi = file->private_data;
-
- poll_wait(file, &fi->fi_wait, wait);
-
- spin_lock(&fi->fi_ast_lock);
- if (!list_empty(&fi->fi_ast_list)) {
- spin_unlock(&fi->fi_ast_lock);
- return POLLIN | POLLRDNORM;
- }
-
- spin_unlock(&fi->fi_ast_lock);
- return 0;
-}
-
-static struct lock_info *allocate_lockinfo(struct file_info *fi, uint8_t cmd,
- struct dlm_lock_params *kparams)
-{
- struct lock_info *li;
-
- if (!try_module_get(THIS_MODULE))
- return NULL;
-
- li = kzalloc(sizeof(struct lock_info), GFP_KERNEL);
- if (li) {
- li->li_magic = LOCKINFO_MAGIC;
- li->li_file = fi;
- li->li_cmd = cmd;
- li->li_flags = 0;
- li->li_grmode = -1;
- li->li_rqmode = -1;
- li->li_pend_bastparam = NULL;
- li->li_pend_bastaddr = NULL;
- li->li_castaddr = NULL;
- li->li_castparam = NULL;
- li->li_lksb.sb_lvbptr = NULL;
- li->li_bastaddr = kparams->bastaddr;
- li->li_bastparam = kparams->bastparam;
-
- get_file_info(fi);
- }
- return li;
-}
-
-static int do_user_lock(struct file_info *fi, uint8_t cmd,
- struct dlm_lock_params *kparams)
-{
- struct lock_info *li;
- int status;
-
- /*
- * Validate things that we need to have correct.
- */
- if (!kparams->castaddr)
- return -EINVAL;
-
- if (!kparams->lksb)
- return -EINVAL;
-
- /* Persistent child locks are not available yet */
- if ((kparams->flags & DLM_LKF_PERSISTENT) && kparams->parent)
- return -EINVAL;
-
- /* For conversions, there should already be a lockinfo struct,
- unless we are adopting an orphaned persistent lock */
- if (kparams->flags & DLM_LKF_CONVERT) {
-
- li = get_lockinfo(fi->fi_ls, kparams->lkid);
-
- /* If this is a persistent lock we will have to create a
- lockinfo again */
- if (!li && (kparams->flags & DLM_LKF_PERSISTENT)) {
- li = allocate_lockinfo(fi, cmd, kparams);
- if (!li)
- return -ENOMEM;
-
- li->li_lksb.sb_lkid = kparams->lkid;
- li->li_castaddr = kparams->castaddr;
- li->li_castparam = kparams->castparam;
-
- /* OK, this isn't exactly a FIRSTLOCK but it is the
- first time we've used this lockinfo, and if things
- fail we want rid of it */
- init_completion(&li->li_firstcomp);
- set_bit(LI_FLAG_FIRSTLOCK, &li->li_flags);
- add_lockinfo(fi->fi_ls, li);
-
- /* TODO: do a query to get the current state ?? */
- }
- if (!li)
- return -EINVAL;
-
- if (li->li_magic != LOCKINFO_MAGIC)
- return -EINVAL;
-
- /* For conversions don't overwrite the current blocking AST
- info so that:
- a) if a blocking AST fires before the conversion is queued
- it runs the current handler
- b) if the conversion is cancelled, the original blocking AST
- declaration is active
- The pend_ info is made active when the conversion
- completes.
- */
- li->li_pend_bastaddr = kparams->bastaddr;
- li->li_pend_bastparam = kparams->bastparam;
- } else {
- li = allocate_lockinfo(fi, cmd, kparams);
- if (!li)
- return -ENOMEM;
-
- /* Allow us to complete our work before
- the AST routine runs. In fact we only need (and use) this
- when the initial lock fails */
- init_completion(&li->li_firstcomp);
- set_bit(LI_FLAG_FIRSTLOCK, &li->li_flags);
- }
-
- li->li_user_lksb = kparams->lksb;
- li->li_castaddr = kparams->castaddr;
- li->li_castparam = kparams->castparam;
- li->li_lksb.sb_lkid = kparams->lkid;
- li->li_rqmode = kparams->mode;
- if (kparams->flags & DLM_LKF_PERSISTENT)
- set_bit(LI_FLAG_PERSISTENT, &li->li_flags);
-
- /* Copy in the value block */
- if (kparams->flags & DLM_LKF_VALBLK) {
- if (!li->li_lksb.sb_lvbptr) {
- li->li_lksb.sb_lvbptr = kmalloc(DLM_USER_LVB_LEN,
- GFP_KERNEL);
- if (!li->li_lksb.sb_lvbptr) {
- status = -ENOMEM;
- goto out_err;
- }
- }
-
- memcpy(li->li_lksb.sb_lvbptr, kparams->lvb, DLM_USER_LVB_LEN);
- }
-
- /* Lock it ... */
- status = dlm_lock(fi->fi_ls->ls_lockspace,
- kparams->mode, &li->li_lksb,
- kparams->flags,
- kparams->name, kparams->namelen,
- kparams->parent,
- ast_routine,
- li,
- (li->li_pend_bastaddr || li->li_bastaddr) ?
- bast_routine : NULL);
- if (status)
- goto out_err;
-
- /* If it succeeded (this far) with a new lock then keep track of
- it on the file's lockinfo list */
- if (!status && test_bit(LI_FLAG_FIRSTLOCK, &li->li_flags)) {
-
- spin_lock(&fi->fi_li_lock);
- list_add(&li->li_ownerqueue, &fi->fi_li_list);
- set_bit(LI_FLAG_ONLIST, &li->li_flags);
- spin_unlock(&fi->fi_li_lock);
- if (add_lockinfo(fi->fi_ls, li))
- printk(KERN_WARNING "Add lockinfo failed\n");
-
- complete(&li->li_firstcomp);
- }
-
- /* Return the lockid as the user needs it /now/ */
- return li->li_lksb.sb_lkid;
-
- out_err:
- if (test_bit(LI_FLAG_FIRSTLOCK, &li->li_flags))
- release_lockinfo(fi->fi_ls, li);
- return status;
-
-}
-
-static int do_user_unlock(struct file_info *fi, uint8_t cmd,
- struct dlm_lock_params *kparams)
-{
- struct lock_info *li;
- int status;
- int convert_cancel = 0;
-
- li = get_lockinfo(fi->fi_ls, kparams->lkid);
- if (!li) {
- li = allocate_lockinfo(fi, cmd, kparams);
- if (!li)
- return -ENOMEM;
- spin_lock(&fi->fi_li_lock);
- list_add(&li->li_ownerqueue, &fi->fi_li_list);
- set_bit(LI_FLAG_ONLIST, &li->li_flags);
- spin_unlock(&fi->fi_li_lock);
- }
-
- if (li->li_magic != LOCKINFO_MAGIC)
- return -EINVAL;
-
- li->li_user_lksb = kparams->lksb;
- li->li_castparam = kparams->castparam;
- li->li_cmd = cmd;
-
- /* Cancelling a conversion doesn't remove the lock...*/
- if (kparams->flags & DLM_LKF_CANCEL && li->li_grmode != -1)
- convert_cancel = 1;
-
- /* Wait until dlm_lock() has completed */
- if (!test_bit(LI_FLAG_ONLIST, &li->li_flags)) {
- wait_for_completion(&li->li_firstcomp);
- }
-
- /* dlm_unlock() passes a 0 for castaddr which means don't overwrite
- the existing li_castaddr as that's the completion routine for
- unlocks. dlm_unlock_wait() specifies a new AST routine to be
- executed when the unlock completes. */
- if (kparams->castaddr)
- li->li_castaddr = kparams->castaddr;
-
- /* Use existing lksb & astparams */
- status = dlm_unlock(fi->fi_ls->ls_lockspace,
- kparams->lkid,
- kparams->flags, &li->li_lksb, li);
-
- if (!status && !convert_cancel) {
- spin_lock(&fi->fi_li_lock);
- list_del(&li->li_ownerqueue);
- clear_bit(LI_FLAG_ONLIST, &li->li_flags);
- spin_unlock(&fi->fi_li_lock);
- }
-
- return status;
-}
-
-/* Write call, submit a locking request */
-static ssize_t dlm_write(struct file *file, const char __user *buffer,
- size_t count, loff_t *ppos)
-{
- struct file_info *fi = file->private_data;
- struct dlm_write_request *kparams;
- sigset_t tmpsig;
- sigset_t allsigs;
- int status;
-
-#ifdef CONFIG_COMPAT
- if (count < sizeof(struct dlm_write_request32))
-#else
- if (count < sizeof(struct dlm_write_request))
-#endif
- return -EINVAL;
-
- if (count > sizeof(struct dlm_write_request) + DLM_RESNAME_MAXLEN)
- return -EINVAL;
-
- /* Has the lockspace been deleted */
- if (fi && test_bit(LS_FLAG_DELETED, &fi->fi_ls->ls_flags))
- return -ENOENT;
-
- kparams = kmalloc(count, GFP_KERNEL);
- if (!kparams)
- return -ENOMEM;
-
- status = -EFAULT;
- /* Get the command info */
- if (copy_from_user(kparams, buffer, count))
- goto out_free;
-
- status = -EBADE;
- if (check_version(kparams))
- goto out_free;
-
-#ifdef CONFIG_COMPAT
- if (!kparams->is64bit) {
- struct dlm_write_request32 *k32params = (struct dlm_write_request32 *)kparams;
- kparams = kmalloc(count + (sizeof(struct dlm_write_request) - sizeof(struct dlm_write_request32)), GFP_KERNEL);
- if (!kparams)
- return -ENOMEM;
-
- if (fi)
- set_bit(FI_FLAG_COMPAT, &fi->fi_flags);
- compat_input(kparams, k32params);
- kfree(k32params);
- }
-#endif
-
- /* Block signals while we are doing this */
- sigfillset(&allsigs);
- sigprocmask(SIG_BLOCK, &allsigs, &tmpsig);
-
- status = -EINVAL;
- switch (kparams->cmd)
- {
- case DLM_USER_LOCK:
- if (!fi) goto out_sig;
- status = do_user_lock(fi, kparams->cmd, &kparams->i.lock);
- break;
-
- case DLM_USER_UNLOCK:
- if (!fi) goto out_sig;
- status = do_user_unlock(fi, kparams->cmd, &kparams->i.lock);
- break;
-
- case DLM_USER_CREATE_LOCKSPACE:
- if (fi) goto out_sig;
- status = do_user_create_lockspace(fi, kparams->cmd,
- &kparams->i.lspace);
- break;
-
- case DLM_USER_REMOVE_LOCKSPACE:
- if (fi) goto out_sig;
- status = do_user_remove_lockspace(fi, kparams->cmd,
- &kparams->i.lspace);
- break;
- default:
- printk("Unknown command passed to DLM device : %d\n",
- kparams->cmd);
- break;
- }
-
- out_sig:
- /* Restore signals */
- sigprocmask(SIG_SETMASK, &tmpsig, NULL);
- recalc_sigpending();
-
- out_free:
- kfree(kparams);
- if (status == 0)
- return count;
- else
- return status;
-}
-
-static struct file_operations _dlm_fops = {
- .open = dlm_open,
- .release = dlm_close,
- .read = dlm_read,
- .write = dlm_write,
- .poll = dlm_poll,
- .owner = THIS_MODULE,
-};
-
-static struct file_operations _dlm_ctl_fops = {
- .open = dlm_ctl_open,
- .release = dlm_ctl_close,
- .write = dlm_write,
- .owner = THIS_MODULE,
-};
-
-/*
- * Create control device
- */
-static int __init dlm_device_init(void)
-{
- int r;
-
- INIT_LIST_HEAD(&user_ls_list);
- mutex_init(&user_ls_lock);
-
- ctl_device.name = "dlm-control";
- ctl_device.fops = &_dlm_ctl_fops;
- ctl_device.minor = MISC_DYNAMIC_MINOR;
-
- r = misc_register(&ctl_device);
- if (r) {
- printk(KERN_ERR "dlm: misc_register failed for control dev\n");
- return r;
- }
-
- return 0;
-}
-
-static void __exit dlm_device_exit(void)
-{
- misc_deregister(&ctl_device);
-}
-
-MODULE_DESCRIPTION("Distributed Lock Manager device interface");
-MODULE_AUTHOR("Red Hat, Inc.");
-MODULE_LICENSE("GPL");
-
-module_init(dlm_device_init);
-module_exit(dlm_device_exit);
#include <linux/kref.h>
#include <linux/kernel.h>
#include <linux/jhash.h>
+#include <linux/miscdevice.h>
#include <linux/mutex.h>
#include <asm/semaphore.h>
#include <asm/uaccess.h>
#define log_error(ls, fmt, args...) \
printk(KERN_ERR "dlm: %s: " fmt "\n", (ls)->ls_name , ##args)
+#define DLM_LOG_DEBUG
#ifdef DLM_LOG_DEBUG
#define log_debug(ls, fmt, args...) log_error(ls, fmt, ##args)
#else
#define DLM_IFL_MSTCPY 0x00010000
#define DLM_IFL_RESEND 0x00020000
+#define DLM_IFL_DEAD 0x00040000
+#define DLM_IFL_USER 0x00000001
+#define DLM_IFL_ORPHAN 0x00000002
struct dlm_lkb {
struct dlm_rsb *lkb_resource; /* the rsb */
struct list_head lkb_rsb_lookup; /* waiting for rsb lookup */
struct list_head lkb_wait_reply; /* waiting for remote reply */
struct list_head lkb_astqueue; /* need ast to be sent */
+ struct list_head lkb_ownqueue; /* list of locks for a process */
char *lkb_lvbptr;
struct dlm_lksb *lkb_lksb; /* caller's status block */
struct dlm_ls {
struct list_head ls_list; /* list of lockspaces */
+ dlm_lockspace_t *ls_local_handle;
uint32_t ls_global_id; /* global unique lockspace ID */
uint32_t ls_exflags;
int ls_lvblen;
wait_queue_head_t ls_uevent_wait; /* user part of join/leave */
int ls_uevent_result;
+ struct miscdevice ls_device;
+
/* recovery related */
struct timer_list ls_timer;
spinlock_t ls_recover_list_lock;
int ls_recover_list_count;
wait_queue_head_t ls_wait_general;
+ struct mutex ls_clear_proc_locks;
struct list_head ls_root_list; /* root resources */
struct rw_semaphore ls_root_sem; /* protect root_list */
#define LSFL_RCOM_READY 3
#define LSFL_UEVENT_WAIT 4
+/* much of this is just saving user space pointers associated with the
+ lock that we pass back to the user lib with an ast */
+
+struct dlm_user_args {
+ struct dlm_user_proc *proc; /* each process that opens the lockspace
+ device has private data
+ (dlm_user_proc) on the struct file,
+ the process's locks point back to it*/
+ struct dlm_lksb lksb;
+ int old_mode;
+ int update_user_lvb;
+ struct dlm_lksb __user *user_lksb;
+ void __user *castparam;
+ void __user *castaddr;
+ void __user *bastparam;
+ void __user *bastaddr;
+};
+
+#define DLM_PROC_FLAGS_CLOSING 1
+#define DLM_PROC_FLAGS_COMPAT 2
+
+/* locks list is kept so we can remove all a process's locks when it
+ exits (or orphan those that are persistent) */
+
+struct dlm_user_proc {
+ dlm_lockspace_t *lockspace;
+ unsigned long flags; /* DLM_PROC_FLAGS */
+ struct list_head asts;
+ spinlock_t asts_spin;
+ struct list_head locks;
+ spinlock_t locks_spin;
+ wait_queue_head_t wait;
+};
+
static inline int dlm_locking_stopped(struct dlm_ls *ls)
{
return !test_bit(LSFL_RUNNING, &ls->ls_flags);
R: do_xxxx()
L: receive_xxxx_reply() <- R: send_xxxx_reply()
*/
-
+#include <linux/types.h>
#include "dlm_internal.h"
+#include <linux/dlm_device.h>
#include "memory.h"
#include "lowcomms.h"
#include "requestqueue.h"
#include "rcom.h"
#include "recover.h"
#include "lvb_table.h"
+#include "user.h"
#include "config.h"
static int send_request(struct dlm_rsb *r, struct dlm_lkb *lkb);
struct dlm_message *ms);
static int receive_extralen(struct dlm_message *ms);
+#define FAKE_USER_AST (void*)0xff00ff00
+
/*
* Lock compatibilty matrix - thanks Steve
* UN = Unlocked state. Not really a state, used as a flag
{0, 0, 0, 0, 0, 0, 0, 0} /* PD */
};
-static void dlm_print_lkb(struct dlm_lkb *lkb)
+void dlm_print_lkb(struct dlm_lkb *lkb)
{
printk(KERN_ERR "lkb: nodeid %d id %x remid %x exflags %x flags %x\n"
" status %d rqmode %d grmode %d wait_type %d ast_type %d\n",
if (len == r->res_length && !memcmp(name, r->res_name, len))
goto found;
}
- return -ENOENT;
+ return -EBADR;
found:
if (r->res_nodeid && (flags & R_MASTER))
if (!error)
goto out;
- if (error == -ENOENT && !(flags & R_CREATE))
+ if (error == -EBADR && !(flags & R_CREATE))
goto out;
/* the rsb was found but wasn't a master copy */
if (!(lkb->lkb_exflags & DLM_LKF_VALBLK))
return;
- b = dlm_lvb_operations[lkb->lkb_grmode + 1][lkb->lkb_rqmode + 1];
+ b = dlm_lvb_operations[lkb->lkb_grmode + 1][lkb->lkb_rqmode + 1];
if (b == 1) {
int len = receive_extralen(ms);
memcpy(lkb->lkb_lvbptr, ms->m_extra, len);
lkb->lkb_rqmode = DLM_LOCK_IV;
switch (lkb->lkb_status) {
+ case DLM_LKSTS_GRANTED:
+ break;
case DLM_LKSTS_CONVERT:
move_lkb(r, lkb, DLM_LKSTS_GRANTED);
break;
return -DLM_EUNLOCK;
}
+/* FIXME: if revert_lock() finds that the lkb is granted, we should
+ skip the queue_cast(ECANCEL). It indicates that the request/convert
+ completed (and queued a normal ast) just before the cancel; we don't
+ want to clobber the sb_result for the normal ast with ECANCEL. */
+
static int do_cancel(struct dlm_rsb *r, struct dlm_lkb *lkb)
{
revert_lock(r, lkb);
confirm_master(r, error);
break;
- case -ENOENT:
+ case -EBADR:
case -ENOTBLK:
/* find_rsb failed to find rsb or rsb wasn't master */
r->res_nodeid = -1;
return 0;
}
+int dlm_user_request(struct dlm_ls *ls, struct dlm_user_args *ua,
+ int mode, uint32_t flags, void *name, unsigned int namelen,
+ uint32_t parent_lkid)
+{
+ struct dlm_lkb *lkb;
+ struct dlm_args args;
+ int error;
+
+ lock_recovery(ls);
+
+ error = create_lkb(ls, &lkb);
+ if (error) {
+ kfree(ua);
+ goto out;
+ }
+
+ if (flags & DLM_LKF_VALBLK) {
+ ua->lksb.sb_lvbptr = kmalloc(DLM_USER_LVB_LEN, GFP_KERNEL);
+ if (!ua->lksb.sb_lvbptr) {
+ kfree(ua);
+ __put_lkb(ls, lkb);
+ error = -ENOMEM;
+ goto out;
+ }
+ }
+
+ /* After ua is attached to lkb it will be freed by free_lkb().
+ When DLM_IFL_USER is set, the dlm knows that this is a userspace
+ lock and that lkb_astparam is the dlm_user_args structure. */
+
+ error = set_lock_args(mode, &ua->lksb, flags, namelen, parent_lkid,
+ FAKE_USER_AST, ua, FAKE_USER_AST, &args);
+ lkb->lkb_flags |= DLM_IFL_USER;
+ ua->old_mode = DLM_LOCK_IV;
+
+ if (error) {
+ __put_lkb(ls, lkb);
+ goto out;
+ }
+
+ error = request_lock(ls, lkb, name, namelen, &args);
+
+ switch (error) {
+ case 0:
+ break;
+ case -EINPROGRESS:
+ error = 0;
+ break;
+ case -EAGAIN:
+ error = 0;
+ /* fall through */
+ default:
+ __put_lkb(ls, lkb);
+ goto out;
+ }
+
+ /* add this new lkb to the per-process list of locks */
+ spin_lock(&ua->proc->locks_spin);
+ kref_get(&lkb->lkb_ref);
+ list_add_tail(&lkb->lkb_ownqueue, &ua->proc->locks);
+ spin_unlock(&ua->proc->locks_spin);
+ out:
+ unlock_recovery(ls);
+ return error;
+}
+
+int dlm_user_convert(struct dlm_ls *ls, struct dlm_user_args *ua_tmp,
+ int mode, uint32_t flags, uint32_t lkid, char *lvb_in)
+{
+ struct dlm_lkb *lkb;
+ struct dlm_args args;
+ struct dlm_user_args *ua;
+ int error;
+
+ lock_recovery(ls);
+
+ error = find_lkb(ls, lkid, &lkb);
+ if (error)
+ goto out;
+
+ /* user can change the params on its lock when it converts it, or
+ add an lvb that didn't exist before */
+
+ ua = (struct dlm_user_args *)lkb->lkb_astparam;
+
+ if (flags & DLM_LKF_VALBLK && !ua->lksb.sb_lvbptr) {
+ ua->lksb.sb_lvbptr = kmalloc(DLM_USER_LVB_LEN, GFP_KERNEL);
+ if (!ua->lksb.sb_lvbptr) {
+ error = -ENOMEM;
+ goto out_put;
+ }
+ }
+ if (lvb_in && ua->lksb.sb_lvbptr)
+ memcpy(ua->lksb.sb_lvbptr, lvb_in, DLM_USER_LVB_LEN);
+
+ ua->castparam = ua_tmp->castparam;
+ ua->castaddr = ua_tmp->castaddr;
+ ua->bastparam = ua_tmp->bastparam;
+ ua->bastaddr = ua_tmp->bastaddr;
+ ua->old_mode = lkb->lkb_grmode;
+
+ error = set_lock_args(mode, &ua->lksb, flags, 0, 0, FAKE_USER_AST, ua,
+ FAKE_USER_AST, &args);
+ if (error)
+ goto out_put;
+
+ error = convert_lock(ls, lkb, &args);
+
+ if (error == -EINPROGRESS || error == -EAGAIN)
+ error = 0;
+ out_put:
+ dlm_put_lkb(lkb);
+ out:
+ unlock_recovery(ls);
+ kfree(ua_tmp);
+ return error;
+}
+
+int dlm_user_unlock(struct dlm_ls *ls, struct dlm_user_args *ua_tmp,
+ uint32_t flags, uint32_t lkid, char *lvb_in)
+{
+ struct dlm_lkb *lkb;
+ struct dlm_args args;
+ struct dlm_user_args *ua;
+ int error;
+
+ lock_recovery(ls);
+
+ error = find_lkb(ls, lkid, &lkb);
+ if (error)
+ goto out;
+
+ ua = (struct dlm_user_args *)lkb->lkb_astparam;
+
+ if (lvb_in && ua->lksb.sb_lvbptr)
+ memcpy(ua->lksb.sb_lvbptr, lvb_in, DLM_USER_LVB_LEN);
+ ua->castparam = ua_tmp->castparam;
+
+ error = set_unlock_args(flags, ua, &args);
+ if (error)
+ goto out_put;
+
+ error = unlock_lock(ls, lkb, &args);
+
+ if (error == -DLM_EUNLOCK)
+ error = 0;
+ if (error)
+ goto out_put;
+
+ spin_lock(&ua->proc->locks_spin);
+ list_del(&lkb->lkb_ownqueue);
+ spin_unlock(&ua->proc->locks_spin);
+
+ /* this removes the reference for the proc->locks list added by
+ dlm_user_request */
+ unhold_lkb(lkb);
+ out_put:
+ dlm_put_lkb(lkb);
+ out:
+ unlock_recovery(ls);
+ return error;
+}
+
+int dlm_user_cancel(struct dlm_ls *ls, struct dlm_user_args *ua_tmp,
+ uint32_t flags, uint32_t lkid)
+{
+ struct dlm_lkb *lkb;
+ struct dlm_args args;
+ struct dlm_user_args *ua;
+ int error;
+
+ lock_recovery(ls);
+
+ error = find_lkb(ls, lkid, &lkb);
+ if (error)
+ goto out;
+
+ ua = (struct dlm_user_args *)lkb->lkb_astparam;
+ ua->castparam = ua_tmp->castparam;
+
+ error = set_unlock_args(flags, ua, &args);
+ if (error)
+ goto out_put;
+
+ error = cancel_lock(ls, lkb, &args);
+
+ if (error == -DLM_ECANCEL)
+ error = 0;
+ if (error)
+ goto out_put;
+
+ /* this lkb was removed from the WAITING queue */
+ if (lkb->lkb_grmode == DLM_LOCK_IV) {
+ spin_lock(&ua->proc->locks_spin);
+ list_del(&lkb->lkb_ownqueue);
+ spin_unlock(&ua->proc->locks_spin);
+ unhold_lkb(lkb);
+ }
+ out_put:
+ dlm_put_lkb(lkb);
+ out:
+ unlock_recovery(ls);
+ return error;
+}
+
+static int orphan_proc_lock(struct dlm_ls *ls, struct dlm_lkb *lkb)
+{
+ struct dlm_user_args *ua = (struct dlm_user_args *)lkb->lkb_astparam;
+
+ if (ua->lksb.sb_lvbptr)
+ kfree(ua->lksb.sb_lvbptr);
+ kfree(ua);
+ lkb->lkb_astparam = (long)NULL;
+
+ /* TODO: propogate to master if needed */
+ return 0;
+}
+
+/* The force flag allows the unlock to go ahead even if the lkb isn't granted.
+ Regardless of what rsb queue the lock is on, it's removed and freed. */
+
+static int unlock_proc_lock(struct dlm_ls *ls, struct dlm_lkb *lkb)
+{
+ struct dlm_user_args *ua = (struct dlm_user_args *)lkb->lkb_astparam;
+ struct dlm_args args;
+ int error;
+
+ /* FIXME: we need to handle the case where the lkb is in limbo
+ while the rsb is being looked up, currently we assert in
+ _unlock_lock/is_remote because rsb nodeid is -1. */
+
+ set_unlock_args(DLM_LKF_FORCEUNLOCK, ua, &args);
+
+ error = unlock_lock(ls, lkb, &args);
+ if (error == -DLM_EUNLOCK)
+ error = 0;
+ return error;
+}
+
+/* The ls_clear_proc_locks mutex protects against dlm_user_add_asts() which
+ 1) references lkb->ua which we free here and 2) adds lkbs to proc->asts,
+ which we clear here. */
+
+/* proc CLOSING flag is set so no more device_reads should look at proc->asts
+ list, and no more device_writes should add lkb's to proc->locks list; so we
+ shouldn't need to take asts_spin or locks_spin here. this assumes that
+ device reads/writes/closes are serialized -- FIXME: we may need to serialize
+ them ourself. */
+
+void dlm_clear_proc_locks(struct dlm_ls *ls, struct dlm_user_proc *proc)
+{
+ struct dlm_lkb *lkb, *safe;
+
+ lock_recovery(ls);
+ mutex_lock(&ls->ls_clear_proc_locks);
+
+ list_for_each_entry_safe(lkb, safe, &proc->locks, lkb_ownqueue) {
+ if (lkb->lkb_ast_type) {
+ list_del(&lkb->lkb_astqueue);
+ unhold_lkb(lkb);
+ }
+
+ list_del(&lkb->lkb_ownqueue);
+
+ if (lkb->lkb_exflags & DLM_LKF_PERSISTENT) {
+ lkb->lkb_flags |= DLM_IFL_ORPHAN;
+ orphan_proc_lock(ls, lkb);
+ } else {
+ lkb->lkb_flags |= DLM_IFL_DEAD;
+ unlock_proc_lock(ls, lkb);
+ }
+
+ /* this removes the reference for the proc->locks list
+ added by dlm_user_request, it may result in the lkb
+ being freed */
+
+ dlm_put_lkb(lkb);
+ }
+ mutex_unlock(&ls->ls_clear_proc_locks);
+ unlock_recovery(ls);
+}
#define __LOCK_DOT_H__
void dlm_print_rsb(struct dlm_rsb *r);
+void dlm_print_lkb(struct dlm_lkb *lkb);
int dlm_receive_message(struct dlm_header *hd, int nodeid, int recovery);
int dlm_modes_compat(int mode1, int mode2);
int dlm_find_rsb(struct dlm_ls *ls, char *name, int namelen,
int dlm_recover_master_copy(struct dlm_ls *ls, struct dlm_rcom *rc);
int dlm_recover_process_copy(struct dlm_ls *ls, struct dlm_rcom *rc);
+int dlm_user_request(struct dlm_ls *ls, struct dlm_user_args *ua, int mode,
+ uint32_t flags, void *name, unsigned int namelen, uint32_t parent_lkid);
+int dlm_user_convert(struct dlm_ls *ls, struct dlm_user_args *ua_tmp,
+ int mode, uint32_t flags, uint32_t lkid, char *lvb_in);
+int dlm_user_unlock(struct dlm_ls *ls, struct dlm_user_args *ua_tmp,
+ uint32_t flags, uint32_t lkid, char *lvb_in);
+int dlm_user_cancel(struct dlm_ls *ls, struct dlm_user_args *ua_tmp,
+ uint32_t flags, uint32_t lkid);
+void dlm_clear_proc_locks(struct dlm_ls *ls, struct dlm_user_proc *proc);
+
static inline int is_master(struct dlm_rsb *r)
{
return !r->res_nodeid;
return ls;
}
-struct dlm_ls *dlm_find_lockspace_local(void *id)
+struct dlm_ls *dlm_find_lockspace_local(dlm_lockspace_t *lockspace)
{
- struct dlm_ls *ls = id;
+ struct dlm_ls *ls;
spin_lock(&lslist_lock);
- ls->ls_count++;
+ list_for_each_entry(ls, &lslist, ls_list) {
+ if (ls->ls_local_handle == lockspace) {
+ ls->ls_count++;
+ goto out;
+ }
+ }
+ ls = NULL;
+ out:
+ spin_unlock(&lslist_lock);
+ return ls;
+}
+
+struct dlm_ls *dlm_find_lockspace_device(int minor)
+{
+ struct dlm_ls *ls;
+
+ spin_lock(&lslist_lock);
+ list_for_each_entry(ls, &lslist, ls_list) {
+ if (ls->ls_device.minor == minor) {
+ ls->ls_count++;
+ goto out;
+ }
+ }
+ ls = NULL;
+ out:
spin_unlock(&lslist_lock);
return ls;
}
init_rwsem(&ls->ls_in_recovery);
INIT_LIST_HEAD(&ls->ls_requestqueue);
mutex_init(&ls->ls_requestqueue_mutex);
+ mutex_init(&ls->ls_clear_proc_locks);
ls->ls_recover_buf = kmalloc(dlm_config.buffer_size, GFP_KERNEL);
if (!ls->ls_recover_buf)
INIT_LIST_HEAD(&ls->ls_recover_list);
spin_lock_init(&ls->ls_recover_list_lock);
ls->ls_recover_list_count = 0;
+ ls->ls_local_handle = ls;
init_waitqueue_head(&ls->ls_wait_general);
INIT_LIST_HEAD(&ls->ls_root_list);
init_rwsem(&ls->ls_root_sem);
void dlm_lockspace_exit(void);
struct dlm_ls *dlm_find_lockspace_global(uint32_t id);
struct dlm_ls *dlm_find_lockspace_local(void *id);
+struct dlm_ls *dlm_find_lockspace_device(int minor);
void dlm_put_lockspace(struct dlm_ls *ls);
#endif /* __LOCKSPACE_DOT_H__ */
#include "dlm_internal.h"
#include "lockspace.h"
#include "lock.h"
+#include "user.h"
#include "memory.h"
#include "lowcomms.h"
#include "config.h"
if (error)
goto out_debug;
+ error = dlm_user_init();
+ if (error)
+ goto out_lowcomms;
+
printk("DLM (built %s %s) installed\n", __DATE__, __TIME__);
return 0;
+ out_lowcomms:
+ dlm_lowcomms_exit();
out_debug:
dlm_unregister_debugfs();
out_config:
static void __exit exit_dlm(void)
{
+ dlm_user_exit();
dlm_lowcomms_exit();
dlm_config_exit();
dlm_memory_exit();
void free_lkb(struct dlm_lkb *lkb)
{
+ if (lkb->lkb_flags & DLM_IFL_USER) {
+ struct dlm_user_args *ua;
+ ua = (struct dlm_user_args *)lkb->lkb_astparam;
+ if (ua) {
+ if (ua->lksb.sb_lvbptr)
+ kfree(ua->lksb.sb_lvbptr);
+ kfree(ua);
+ }
+ }
kmem_cache_free(lkb_cache, lkb);
}
--- /dev/null
+/*
+ * Copyright (C) 2006 Red Hat, Inc. All rights reserved.
+ *
+ * This copyrighted material is made available to anyone wishing to use,
+ * modify, copy, or redistribute it subject to the terms and conditions
+ * of the GNU General Public License v.2.
+ */
+
+#include <linux/miscdevice.h>
+#include <linux/init.h>
+#include <linux/wait.h>
+#include <linux/module.h>
+#include <linux/file.h>
+#include <linux/fs.h>
+#include <linux/poll.h>
+#include <linux/signal.h>
+#include <linux/spinlock.h>
+#include <linux/dlm.h>
+#include <linux/dlm_device.h>
+
+#include "dlm_internal.h"
+#include "lockspace.h"
+#include "lock.h"
+#include "lvb_table.h"
+
+static const char *name_prefix="dlm";
+static struct miscdevice ctl_device;
+static struct file_operations device_fops;
+
+#ifdef CONFIG_COMPAT
+
+struct dlm_lock_params32 {
+ __u8 mode;
+ __u8 namelen;
+ __u16 flags;
+ __u32 lkid;
+ __u32 parent;
+
+ __u32 castparam;
+ __u32 castaddr;
+ __u32 bastparam;
+ __u32 bastaddr;
+ __u32 lksb;
+
+ char lvb[DLM_USER_LVB_LEN];
+ char name[0];
+};
+
+struct dlm_write_request32 {
+ __u32 version[3];
+ __u8 cmd;
+ __u8 is64bit;
+ __u8 unused[2];
+
+ union {
+ struct dlm_lock_params32 lock;
+ struct dlm_lspace_params lspace;
+ } i;
+};
+
+struct dlm_lksb32 {
+ __u32 sb_status;
+ __u32 sb_lkid;
+ __u8 sb_flags;
+ __u32 sb_lvbptr;
+};
+
+struct dlm_lock_result32 {
+ __u32 length;
+ __u32 user_astaddr;
+ __u32 user_astparam;
+ __u32 user_lksb;
+ struct dlm_lksb32 lksb;
+ __u8 bast_mode;
+ __u8 unused[3];
+ /* Offsets may be zero if no data is present */
+ __u32 lvb_offset;
+};
+
+static void compat_input(struct dlm_write_request *kb,
+ struct dlm_write_request32 *kb32)
+{
+ kb->version[0] = kb32->version[0];
+ kb->version[1] = kb32->version[1];
+ kb->version[2] = kb32->version[2];
+
+ kb->cmd = kb32->cmd;
+ kb->is64bit = kb32->is64bit;
+ if (kb->cmd == DLM_USER_CREATE_LOCKSPACE ||
+ kb->cmd == DLM_USER_REMOVE_LOCKSPACE) {
+ kb->i.lspace.flags = kb32->i.lspace.flags;
+ kb->i.lspace.minor = kb32->i.lspace.minor;
+ strcpy(kb->i.lspace.name, kb32->i.lspace.name);
+ } else {
+ kb->i.lock.mode = kb32->i.lock.mode;
+ kb->i.lock.namelen = kb32->i.lock.namelen;
+ kb->i.lock.flags = kb32->i.lock.flags;
+ kb->i.lock.lkid = kb32->i.lock.lkid;
+ kb->i.lock.parent = kb32->i.lock.parent;
+ kb->i.lock.castparam = (void *)(long)kb32->i.lock.castparam;
+ kb->i.lock.castaddr = (void *)(long)kb32->i.lock.castaddr;
+ kb->i.lock.bastparam = (void *)(long)kb32->i.lock.bastparam;
+ kb->i.lock.bastaddr = (void *)(long)kb32->i.lock.bastaddr;
+ kb->i.lock.lksb = (void *)(long)kb32->i.lock.lksb;
+ memcpy(kb->i.lock.lvb, kb32->i.lock.lvb, DLM_USER_LVB_LEN);
+ memcpy(kb->i.lock.name, kb32->i.lock.name, kb->i.lock.namelen);
+ }
+}
+
+static void compat_output(struct dlm_lock_result *res,
+ struct dlm_lock_result32 *res32)
+{
+ res32->length = res->length - (sizeof(struct dlm_lock_result) -
+ sizeof(struct dlm_lock_result32));
+ res32->user_astaddr = (__u32)(long)res->user_astaddr;
+ res32->user_astparam = (__u32)(long)res->user_astparam;
+ res32->user_lksb = (__u32)(long)res->user_lksb;
+ res32->bast_mode = res->bast_mode;
+
+ res32->lvb_offset = res->lvb_offset;
+ res32->length = res->length;
+
+ res32->lksb.sb_status = res->lksb.sb_status;
+ res32->lksb.sb_flags = res->lksb.sb_flags;
+ res32->lksb.sb_lkid = res->lksb.sb_lkid;
+ res32->lksb.sb_lvbptr = (__u32)(long)res->lksb.sb_lvbptr;
+}
+#endif
+
+
+void dlm_user_add_ast(struct dlm_lkb *lkb, int type)
+{
+ struct dlm_ls *ls;
+ struct dlm_user_args *ua;
+ struct dlm_user_proc *proc;
+
+ /* dlm_clear_proc_locks() sets ORPHAN/DEAD flag on each
+ lkb before dealing with it. We need to check this
+ flag before taking ls_clear_proc_locks mutex because if
+ it's set, dlm_clear_proc_locks() holds the mutex. */
+
+ if (lkb->lkb_flags & (DLM_IFL_ORPHAN | DLM_IFL_DEAD)) {
+ /* log_print("user_add_ast skip1 %x", lkb->lkb_flags); */
+ return;
+ }
+
+ ls = lkb->lkb_resource->res_ls;
+ mutex_lock(&ls->ls_clear_proc_locks);
+
+ /* If ORPHAN/DEAD flag is set, it means the process is dead so an ast
+ can't be delivered. For ORPHAN's, dlm_clear_proc_locks() freed
+ lkb->ua so we can't try to use it. */
+
+ if (lkb->lkb_flags & (DLM_IFL_ORPHAN | DLM_IFL_DEAD)) {
+ /* log_print("user_add_ast skip2 %x", lkb->lkb_flags); */
+ goto out;
+ }
+
+ DLM_ASSERT(lkb->lkb_astparam, dlm_print_lkb(lkb););
+ ua = (struct dlm_user_args *)lkb->lkb_astparam;
+ proc = ua->proc;
+
+ if (type == AST_BAST && ua->bastaddr == NULL)
+ goto out;
+
+ spin_lock(&proc->asts_spin);
+ if (!(lkb->lkb_ast_type & (AST_COMP | AST_BAST))) {
+ kref_get(&lkb->lkb_ref);
+ list_add_tail(&lkb->lkb_astqueue, &proc->asts);
+ lkb->lkb_ast_type |= type;
+ wake_up_interruptible(&proc->wait);
+ }
+
+ /* We want to copy the lvb to userspace when the completion
+ ast is read if the status is 0, the lock has an lvb and
+ lvb_ops says we should. We could probably have set_lvb_lock()
+ set update_user_lvb instead and not need old_mode */
+
+ if ((lkb->lkb_ast_type & AST_COMP) &&
+ (lkb->lkb_lksb->sb_status == 0) &&
+ lkb->lkb_lksb->sb_lvbptr &&
+ dlm_lvb_operations[ua->old_mode + 1][lkb->lkb_grmode + 1])
+ ua->update_user_lvb = 1;
+ else
+ ua->update_user_lvb = 0;
+
+ spin_unlock(&proc->asts_spin);
+ out:
+ mutex_unlock(&ls->ls_clear_proc_locks);
+}
+
+static int device_user_lock(struct dlm_user_proc *proc,
+ struct dlm_lock_params *params)
+{
+ struct dlm_ls *ls;
+ struct dlm_user_args *ua;
+ int error = -ENOMEM;
+
+ ls = dlm_find_lockspace_local(proc->lockspace);
+ if (!ls)
+ return -ENOENT;
+
+ if (!params->castaddr || !params->lksb) {
+ error = -EINVAL;
+ goto out;
+ }
+
+ ua = kzalloc(sizeof(struct dlm_user_args), GFP_KERNEL);
+ if (!ua)
+ goto out;
+ ua->proc = proc;
+ ua->user_lksb = params->lksb;
+ ua->castparam = params->castparam;
+ ua->castaddr = params->castaddr;
+ ua->bastparam = params->bastparam;
+ ua->bastaddr = params->bastaddr;
+
+ if (params->flags & DLM_LKF_CONVERT)
+ error = dlm_user_convert(ls, ua,
+ params->mode, params->flags,
+ params->lkid, params->lvb);
+ else {
+ error = dlm_user_request(ls, ua,
+ params->mode, params->flags,
+ params->name, params->namelen,
+ params->parent);
+ if (!error)
+ error = ua->lksb.sb_lkid;
+ }
+ out:
+ dlm_put_lockspace(ls);
+ return error;
+}
+
+static int device_user_unlock(struct dlm_user_proc *proc,
+ struct dlm_lock_params *params)
+{
+ struct dlm_ls *ls;
+ struct dlm_user_args *ua;
+ int error = -ENOMEM;
+
+ ls = dlm_find_lockspace_local(proc->lockspace);
+ if (!ls)
+ return -ENOENT;
+
+ ua = kzalloc(sizeof(struct dlm_user_args), GFP_KERNEL);
+ if (!ua)
+ goto out;
+ ua->proc = proc;
+ ua->user_lksb = params->lksb;
+ ua->castparam = params->castparam;
+ ua->castaddr = params->castaddr;
+
+ if (params->flags & DLM_LKF_CANCEL)
+ error = dlm_user_cancel(ls, ua, params->flags, params->lkid);
+ else
+ error = dlm_user_unlock(ls, ua, params->flags, params->lkid,
+ params->lvb);
+ out:
+ dlm_put_lockspace(ls);
+ return error;
+}
+
+static int device_create_lockspace(struct dlm_lspace_params *params)
+{
+ dlm_lockspace_t *lockspace;
+ struct dlm_ls *ls;
+ int error, len;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
+ error = dlm_new_lockspace(params->name, strlen(params->name),
+ &lockspace, 0, DLM_USER_LVB_LEN);
+ if (error)
+ return error;
+
+ ls = dlm_find_lockspace_local(lockspace);
+ if (!ls)
+ return -ENOENT;
+
+ error = -ENOMEM;
+ len = strlen(params->name) + strlen(name_prefix) + 2;
+ ls->ls_device.name = kzalloc(len, GFP_KERNEL);
+ if (!ls->ls_device.name)
+ goto fail;
+ snprintf((char *)ls->ls_device.name, len, "%s_%s", name_prefix,
+ params->name);
+ ls->ls_device.fops = &device_fops;
+ ls->ls_device.minor = MISC_DYNAMIC_MINOR;
+
+ error = misc_register(&ls->ls_device);
+ if (error) {
+ kfree(ls->ls_device.name);
+ goto fail;
+ }
+
+ error = ls->ls_device.minor;
+ dlm_put_lockspace(ls);
+ return error;
+
+ fail:
+ dlm_put_lockspace(ls);
+ dlm_release_lockspace(lockspace, 0);
+ return error;
+}
+
+static int device_remove_lockspace(struct dlm_lspace_params *params)
+{
+ dlm_lockspace_t *lockspace;
+ struct dlm_ls *ls;
+ int error;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
+ ls = dlm_find_lockspace_device(params->minor);
+ if (!ls)
+ return -ENOENT;
+
+ error = misc_deregister(&ls->ls_device);
+ if (error) {
+ dlm_put_lockspace(ls);
+ goto out;
+ }
+ kfree(ls->ls_device.name);
+
+ lockspace = ls->ls_local_handle;
+
+ /* dlm_release_lockspace waits for references to go to zero,
+ so all processes will need to close their device for the ls
+ before the release will procede */
+
+ dlm_put_lockspace(ls);
+ error = dlm_release_lockspace(lockspace, 0);
+out:
+ return error;
+}
+
+/* Check the user's version matches ours */
+static int check_version(struct dlm_write_request *req)
+{
+ if (req->version[0] != DLM_DEVICE_VERSION_MAJOR ||
+ (req->version[0] == DLM_DEVICE_VERSION_MAJOR &&
+ req->version[1] > DLM_DEVICE_VERSION_MINOR)) {
+
+ printk(KERN_DEBUG "dlm: process %s (%d) version mismatch "
+ "user (%d.%d.%d) kernel (%d.%d.%d)\n",
+ current->comm,
+ current->pid,
+ req->version[0],
+ req->version[1],
+ req->version[2],
+ DLM_DEVICE_VERSION_MAJOR,
+ DLM_DEVICE_VERSION_MINOR,
+ DLM_DEVICE_VERSION_PATCH);
+ return -EINVAL;
+ }
+ return 0;
+}
+
+/*
+ * device_write
+ *
+ * device_user_lock
+ * dlm_user_request -> request_lock
+ * dlm_user_convert -> convert_lock
+ *
+ * device_user_unlock
+ * dlm_user_unlock -> unlock_lock
+ * dlm_user_cancel -> cancel_lock
+ *
+ * device_create_lockspace
+ * dlm_new_lockspace
+ *
+ * device_remove_lockspace
+ * dlm_release_lockspace
+ */
+
+/* a write to a lockspace device is a lock or unlock request, a write
+ to the control device is to create/remove a lockspace */
+
+static ssize_t device_write(struct file *file, const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ struct dlm_user_proc *proc = file->private_data;
+ struct dlm_write_request *kbuf;
+ sigset_t tmpsig, allsigs;
+ int error;
+
+#ifdef CONFIG_COMPAT
+ if (count < sizeof(struct dlm_write_request32))
+#else
+ if (count < sizeof(struct dlm_write_request))
+#endif
+ return -EINVAL;
+
+ kbuf = kmalloc(count, GFP_KERNEL);
+ if (!kbuf)
+ return -ENOMEM;
+
+ if (copy_from_user(kbuf, buf, count)) {
+ error = -EFAULT;
+ goto out_free;
+ }
+
+ if (check_version(kbuf)) {
+ error = -EBADE;
+ goto out_free;
+ }
+
+#ifdef CONFIG_COMPAT
+ if (!kbuf->is64bit) {
+ struct dlm_write_request32 *k32buf;
+ k32buf = (struct dlm_write_request32 *)kbuf;
+ kbuf = kmalloc(count + (sizeof(struct dlm_write_request) -
+ sizeof(struct dlm_write_request32)), GFP_KERNEL);
+ if (!kbuf)
+ return -ENOMEM;
+
+ if (proc)
+ set_bit(DLM_PROC_FLAGS_COMPAT, &proc->flags);
+ compat_input(kbuf, k32buf);
+ kfree(k32buf);
+ }
+#endif
+
+ /* do we really need this? can a write happen after a close? */
+ if ((kbuf->cmd == DLM_USER_LOCK || kbuf->cmd == DLM_USER_UNLOCK) &&
+ test_bit(DLM_PROC_FLAGS_CLOSING, &proc->flags))
+ return -EINVAL;
+
+ sigfillset(&allsigs);
+ sigprocmask(SIG_BLOCK, &allsigs, &tmpsig);
+
+ error = -EINVAL;
+
+ switch (kbuf->cmd)
+ {
+ case DLM_USER_LOCK:
+ if (!proc) {
+ log_print("no locking on control device");
+ goto out_sig;
+ }
+ error = device_user_lock(proc, &kbuf->i.lock);
+ break;
+
+ case DLM_USER_UNLOCK:
+ if (!proc) {
+ log_print("no locking on control device");
+ goto out_sig;
+ }
+ error = device_user_unlock(proc, &kbuf->i.lock);
+ break;
+
+ case DLM_USER_CREATE_LOCKSPACE:
+ if (proc) {
+ log_print("create/remove only on control device");
+ goto out_sig;
+ }
+ error = device_create_lockspace(&kbuf->i.lspace);
+ break;
+
+ case DLM_USER_REMOVE_LOCKSPACE:
+ if (proc) {
+ log_print("create/remove only on control device");
+ goto out_sig;
+ }
+ error = device_remove_lockspace(&kbuf->i.lspace);
+ break;
+
+ default:
+ log_print("Unknown command passed to DLM device : %d\n",
+ kbuf->cmd);
+ }
+
+ out_sig:
+ sigprocmask(SIG_SETMASK, &tmpsig, NULL);
+ recalc_sigpending();
+ out_free:
+ kfree(kbuf);
+ return error;
+}
+
+/* Every process that opens the lockspace device has its own "proc" structure
+ hanging off the open file that's used to keep track of locks owned by the
+ process and asts that need to be delivered to the process. */
+
+static int device_open(struct inode *inode, struct file *file)
+{
+ struct dlm_user_proc *proc;
+ struct dlm_ls *ls;
+
+ ls = dlm_find_lockspace_device(iminor(inode));
+ if (!ls)
+ return -ENOENT;
+
+ proc = kzalloc(sizeof(struct dlm_user_proc), GFP_KERNEL);
+ if (!proc) {
+ dlm_put_lockspace(ls);
+ return -ENOMEM;
+ }
+
+ proc->lockspace = ls->ls_local_handle;
+ INIT_LIST_HEAD(&proc->asts);
+ INIT_LIST_HEAD(&proc->locks);
+ spin_lock_init(&proc->asts_spin);
+ spin_lock_init(&proc->locks_spin);
+ init_waitqueue_head(&proc->wait);
+ file->private_data = proc;
+
+ return 0;
+}
+
+static int device_close(struct inode *inode, struct file *file)
+{
+ struct dlm_user_proc *proc = file->private_data;
+ struct dlm_ls *ls;
+ sigset_t tmpsig, allsigs;
+
+ ls = dlm_find_lockspace_local(proc->lockspace);
+ if (!ls)
+ return -ENOENT;
+
+ sigfillset(&allsigs);
+ sigprocmask(SIG_BLOCK, &allsigs, &tmpsig);
+
+ set_bit(DLM_PROC_FLAGS_CLOSING, &proc->flags);
+
+ dlm_clear_proc_locks(ls, proc);
+
+ /* at this point no more lkb's should exist for this lockspace,
+ so there's no chance of dlm_user_add_ast() being called and
+ looking for lkb->ua->proc */
+
+ kfree(proc);
+ file->private_data = NULL;
+
+ dlm_put_lockspace(ls);
+ dlm_put_lockspace(ls); /* for the find in device_open() */
+
+ /* FIXME: AUTOFREE: if this ls is no longer used do
+ device_remove_lockspace() */
+
+ sigprocmask(SIG_SETMASK, &tmpsig, NULL);
+ recalc_sigpending();
+
+ return 0;
+}
+
+static int copy_result_to_user(struct dlm_user_args *ua, int compat, int type,
+ int bmode, char __user *buf, size_t count)
+{
+#ifdef CONFIG_COMPAT
+ struct dlm_lock_result32 result32;
+#endif
+ struct dlm_lock_result result;
+ void *resultptr;
+ int error=0;
+ int len;
+ int struct_len;
+
+ memset(&result, 0, sizeof(struct dlm_lock_result));
+ memcpy(&result.lksb, &ua->lksb, sizeof(struct dlm_lksb));
+ result.user_lksb = ua->user_lksb;
+
+ /* FIXME: dlm1 provides for the user's bastparam/addr to not be updated
+ in a conversion unless the conversion is successful. See code
+ in dlm_user_convert() for updating ua from ua_tmp. OpenVMS, though,
+ notes that a new blocking AST address and parameter are set even if
+ the conversion fails, so maybe we should just do that. */
+
+ if (type == AST_BAST) {
+ result.user_astaddr = ua->bastaddr;
+ result.user_astparam = ua->bastparam;
+ result.bast_mode = bmode;
+ } else {
+ result.user_astaddr = ua->castaddr;
+ result.user_astparam = ua->castparam;
+ }
+
+#ifdef CONFIG_COMPAT
+ if (compat)
+ len = sizeof(struct dlm_lock_result32);
+ else
+#endif
+ len = sizeof(struct dlm_lock_result);
+ struct_len = len;
+
+ /* copy lvb to userspace if there is one, it's been updated, and
+ the user buffer has space for it */
+
+ if (ua->update_user_lvb && ua->lksb.sb_lvbptr &&
+ count >= len + DLM_USER_LVB_LEN) {
+ if (copy_to_user(buf+len, ua->lksb.sb_lvbptr,
+ DLM_USER_LVB_LEN)) {
+ error = -EFAULT;
+ goto out;
+ }
+
+ result.lvb_offset = len;
+ len += DLM_USER_LVB_LEN;
+ }
+
+ result.length = len;
+ resultptr = &result;
+#ifdef CONFIG_COMPAT
+ if (compat) {
+ compat_output(&result, &result32);
+ resultptr = &result32;
+ }
+#endif
+
+ if (copy_to_user(buf, resultptr, struct_len))
+ error = -EFAULT;
+ else
+ error = len;
+ out:
+ return error;
+}
+
+/* a read returns a single ast described in a struct dlm_lock_result */
+
+static ssize_t device_read(struct file *file, char __user *buf, size_t count,
+ loff_t *ppos)
+{
+ struct dlm_user_proc *proc = file->private_data;
+ struct dlm_lkb *lkb;
+ struct dlm_user_args *ua;
+ DECLARE_WAITQUEUE(wait, current);
+ int error, type=0, bmode=0, removed = 0;
+
+#ifdef CONFIG_COMPAT
+ if (count < sizeof(struct dlm_lock_result32))
+#else
+ if (count < sizeof(struct dlm_lock_result))
+#endif
+ return -EINVAL;
+
+ /* do we really need this? can a read happen after a close? */
+ if (test_bit(DLM_PROC_FLAGS_CLOSING, &proc->flags))
+ return -EINVAL;
+
+ spin_lock(&proc->asts_spin);
+ if (list_empty(&proc->asts)) {
+ if (file->f_flags & O_NONBLOCK) {
+ spin_unlock(&proc->asts_spin);
+ return -EAGAIN;
+ }
+
+ add_wait_queue(&proc->wait, &wait);
+
+ repeat:
+ set_current_state(TASK_INTERRUPTIBLE);
+ if (list_empty(&proc->asts) && !signal_pending(current)) {
+ spin_unlock(&proc->asts_spin);
+ schedule();
+ spin_lock(&proc->asts_spin);
+ goto repeat;
+ }
+ set_current_state(TASK_RUNNING);
+ remove_wait_queue(&proc->wait, &wait);
+
+ if (signal_pending(current)) {
+ spin_unlock(&proc->asts_spin);
+ return -ERESTARTSYS;
+ }
+ }
+
+ if (list_empty(&proc->asts)) {
+ spin_unlock(&proc->asts_spin);
+ return -EAGAIN;
+ }
+
+ /* there may be both completion and blocking asts to return for
+ the lkb, don't remove lkb from asts list unless no asts remain */
+
+ lkb = list_entry(proc->asts.next, struct dlm_lkb, lkb_astqueue);
+
+ if (lkb->lkb_ast_type & AST_COMP) {
+ lkb->lkb_ast_type &= ~AST_COMP;
+ type = AST_COMP;
+ } else if (lkb->lkb_ast_type & AST_BAST) {
+ lkb->lkb_ast_type &= ~AST_BAST;
+ type = AST_BAST;
+ bmode = lkb->lkb_bastmode;
+ }
+
+ if (!lkb->lkb_ast_type) {
+ list_del(&lkb->lkb_astqueue);
+ removed = 1;
+ }
+ spin_unlock(&proc->asts_spin);
+
+ ua = (struct dlm_user_args *)lkb->lkb_astparam;
+ error = copy_result_to_user(ua,
+ test_bit(DLM_PROC_FLAGS_COMPAT, &proc->flags),
+ type, bmode, buf, count);
+
+ /* removes reference for the proc->asts lists added by
+ dlm_user_add_ast() and may result in the lkb being freed */
+ if (removed)
+ dlm_put_lkb(lkb);
+
+ return error;
+}
+
+static unsigned int device_poll(struct file *file, poll_table *wait)
+{
+ struct dlm_user_proc *proc = file->private_data;
+
+ poll_wait(file, &proc->wait, wait);
+
+ spin_lock(&proc->asts_spin);
+ if (!list_empty(&proc->asts)) {
+ spin_unlock(&proc->asts_spin);
+ return POLLIN | POLLRDNORM;
+ }
+ spin_unlock(&proc->asts_spin);
+ return 0;
+}
+
+static int ctl_device_open(struct inode *inode, struct file *file)
+{
+ file->private_data = NULL;
+ return 0;
+}
+
+static int ctl_device_close(struct inode *inode, struct file *file)
+{
+ return 0;
+}
+
+static struct file_operations device_fops = {
+ .open = device_open,
+ .release = device_close,
+ .read = device_read,
+ .write = device_write,
+ .poll = device_poll,
+ .owner = THIS_MODULE,
+};
+
+static struct file_operations ctl_device_fops = {
+ .open = ctl_device_open,
+ .release = ctl_device_close,
+ .write = device_write,
+ .owner = THIS_MODULE,
+};
+
+int dlm_user_init(void)
+{
+ int error;
+
+ ctl_device.name = "dlm-control";
+ ctl_device.fops = &ctl_device_fops;
+ ctl_device.minor = MISC_DYNAMIC_MINOR;
+
+ error = misc_register(&ctl_device);
+ if (error)
+ log_print("misc_register failed for control device");
+
+ return error;
+}
+
+void dlm_user_exit(void)
+{
+ misc_deregister(&ctl_device);
+}
+
--- /dev/null
+/*
+ * Copyright (C) 2006 Red Hat, Inc. All rights reserved.
+ *
+ * This copyrighted material is made available to anyone wishing to use,
+ * modify, copy, or redistribute it subject to the terms and conditions
+ * of the GNU General Public License v.2.
+ */
+
+#ifndef __USER_DOT_H__
+#define __USER_DOT_H__
+
+void dlm_user_add_ast(struct dlm_lkb *lkb, int type);
+int dlm_user_init(void);
+void dlm_user_exit(void);
+
+#endif
projects / GitHub / LineageOS / G12 / android_kernel_amlogic_linux-4.9.git / commitdiff