Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-11-10 14:11:52 +00:00
Code Issues Packages Projects Releases Wiki Activity

GFS2: Merge lock_dlm module into GFS2

Browse Source 
This is the big patch that I've been working on for some time
now. There are many reasons for wanting to make this change
such as:
 o Reducing overhead by eliminating duplicated fields between structures
 o Simplifcation of the code (reduces the code size by a fair bit)
 o The locking interface is now the DLM interface itself as proposed
   some time ago.
 o Fewer lookups of glocks when processing replies from the DLM
 o Fewer memory allocations/deallocations for each glock
 o Scope to do further optimisations in the future (but this patch is
   more than big enough for now!)

Please note that (a) this patch relates to the lock_dlm module and
not the DLM itself, that is still a separate module; and (b) that
we retain the ability to build GFS2 as a standalone single node
filesystem with out requiring the DLM.

This patch needs a lot of testing, hence my keeping it I restarted
my -git tree after the last merge window. That way, this has the maximum
exposure before its merged. This is (modulo a few minor bug fixes) the
same patch that I've been posting on and off the the last three months
and its passed a number of different tests so far.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
This commit is contained in:
Steven Whitehouse 2009-01-12 10:43:39 +00:00 committed by Steven Whitehouse
parent 22077f57de
commit f057f6cdf6
42 changed files with 819 additions and 2447 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
fs/gfs2/Kconfig
View File

@ -1,6 +1,10 @@
config GFS2_FS
tristate "GFS2 file system support"
depends on EXPERIMENTAL && (64BIT || LBD)
select DLM if GFS2_FS_LOCKING_DLM
select CONFIGFS_FS if GFS2_FS_LOCKING_DLM
select SYSFS if GFS2_FS_LOCKING_DLM
select IP_SCTP if DLM_SCTP
select FS_POSIX_ACL
select CRC32
help
@ -18,17 +22,16 @@ config GFS2_FS
the locking module below. Documentation and utilities for GFS2 can
be found here: http://sources.redhat.com/cluster
The "nolock" lock module is now built in to GFS2 by default.
The "nolock" lock module is now built in to GFS2 by default. If
you want to use the DLM, be sure to enable HOTPLUG and IPv4/6
networking.
config GFS2_FS_LOCKING_DLM
tristate "GFS2 DLM locking module"
depends on GFS2_FS && SYSFS && NET && INET && (IPV6 || IPV6=n)
select IP_SCTP if DLM_SCTP
select CONFIGFS_FS
select DLM
bool "GFS2 DLM locking"
depends on (GFS2_FS!=n) && NET && INET && (IPV6 || IPV6=n) && HOTPLUG
help
Multiple node locking module for GFS2
Most users of GFS2 will require this module. It provides the locking
Most users of GFS2 will require this. It provides the locking
interface between GFS2 and the DLM, which is required to use GFS2
in a cluster environment.

4
fs/gfs2/Makefile
View File

@ -1,9 +1,9 @@
obj-$(CONFIG_GFS2_FS) += gfs2.o
gfs2-y := acl.o bmap.o dir.o eaops.o eattr.o glock.o \
glops.o inode.o log.o lops.o locking.o main.o meta_io.o \
glops.o inode.o log.o lops.o main.o meta_io.o \
mount.o ops_address.o ops_dentry.o ops_export.o ops_file.o \
ops_fstype.o ops_inode.o ops_super.o quota.o \
recovery.o rgrp.o super.o sys.o trans.o util.o
obj-$(CONFIG_GFS2_FS_LOCKING_DLM) += locking/dlm/
gfs2-$(CONFIG_GFS2_FS_LOCKING_DLM) += lock_dlm.o

1
fs/gfs2/acl.c
View File

@ -15,7 +15,6 @@
#include <linux/posix_acl.h>
#include <linux/posix_acl_xattr.h>
#include <linux/gfs2_ondisk.h>
#include <linux/lm_interface.h>
#include "gfs2.h"
#include "incore.h"

1
fs/gfs2/bmap.c
View File

@ -13,7 +13,6 @@
#include <linux/buffer_head.h>
#include <linux/gfs2_ondisk.h>
#include <linux/crc32.h>
#include <linux/lm_interface.h>
#include "gfs2.h"
#include "incore.h"

1
fs/gfs2/dir.c
View File

@ -60,7 +60,6 @@
#include <linux/gfs2_ondisk.h>
#include <linux/crc32.h>
#include <linux/vmalloc.h>
#include <linux/lm_interface.h>
#include "gfs2.h"
#include "incore.h"

1
fs/gfs2/eaops.c
View File

@ -14,7 +14,6 @@
#include <linux/capability.h>
#include <linux/xattr.h>
#include <linux/gfs2_ondisk.h>
#include <linux/lm_interface.h>
#include <asm/uaccess.h>
#include "gfs2.h"

1
fs/gfs2/eattr.c
View File

@ -13,7 +13,6 @@
#include <linux/buffer_head.h>
#include <linux/xattr.h>
#include <linux/gfs2_ondisk.h>
#include <linux/lm_interface.h>
#include <asm/uaccess.h>
#include "gfs2.h"

249
fs/gfs2/glock.c
View File

@ -10,7 +10,6 @@
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/completion.h>
#include <linux/buffer_head.h>
#include <linux/delay.h>
#include <linux/sort.h>
@ -18,7 +17,6 @@
#include <linux/kallsyms.h>
#include <linux/gfs2_ondisk.h>
#include <linux/list.h>
#include <linux/lm_interface.h>
#include <linux/wait.h>
#include <linux/module.h>
#include <linux/rwsem.h>
@ -155,13 +153,10 @@ static void glock_free(struct gfs2_glock *gl)
struct gfs2_sbd *sdp = gl->gl_sbd;
struct inode *aspace = gl->gl_aspace;
if (sdp->sd_lockstruct.ls_ops->lm_put_lock)
sdp->sd_lockstruct.ls_ops->lm_put_lock(gl->gl_lock);
if (aspace)
gfs2_aspace_put(aspace);
kmem_cache_free(gfs2_glock_cachep, gl);
sdp->sd_lockstruct.ls_ops->lm_put_lock(gfs2_glock_cachep, gl);
}
/**
@ -211,7 +206,6 @@ int gfs2_glock_put(struct gfs2_glock *gl)
atomic_dec(&lru_count);
}
spin_unlock(&lru_lock);
GLOCK_BUG_ON(gl, gl->gl_state != LM_ST_UNLOCKED);
GLOCK_BUG_ON(gl, !list_empty(&gl->gl_lru));
GLOCK_BUG_ON(gl, !list_empty(&gl->gl_holders));
glock_free(gl);
@ -255,27 +249,6 @@ static struct gfs2_glock *search_bucket(unsigned int hash,
return NULL;
}
/**
* gfs2_glock_find() - Find glock by lock number
* @sdp: The GFS2 superblock
* @name: The lock name
*
* Returns: NULL, or the struct gfs2_glock with the requested number
*/
static struct gfs2_glock *gfs2_glock_find(const struct gfs2_sbd *sdp,
const struct lm_lockname *name)
{
unsigned int hash = gl_hash(sdp, name);
struct gfs2_glock *gl;
read_lock(gl_lock_addr(hash));
gl = search_bucket(hash, sdp, name);
read_unlock(gl_lock_addr(hash));
return gl;
}
/**
* may_grant - check if its ok to grant a new lock
* @gl: The glock
@ -523,7 +496,7 @@ out_locked:
}
static unsigned int gfs2_lm_lock(struct gfs2_sbd *sdp, void *lock,
unsigned int cur_state, unsigned int req_state,
unsigned int req_state,
unsigned int flags)
{
int ret = LM_OUT_ERROR;
@ -532,7 +505,7 @@ static unsigned int gfs2_lm_lock(struct gfs2_sbd *sdp, void *lock,
return req_state == LM_ST_UNLOCKED ? 0 : req_state;
if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
ret = sdp->sd_lockstruct.ls_ops->lm_lock(lock, cur_state,
ret = sdp->sd_lockstruct.ls_ops->lm_lock(lock,
req_state, flags);
return ret;
}
@ -575,7 +548,7 @@ __acquires(&gl->gl_spin)
gl->gl_state == LM_ST_DEFERRED) &&
!(lck_flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB)))
lck_flags |= LM_FLAG_TRY_1CB;
ret = gfs2_lm_lock(sdp, gl->gl_lock, gl->gl_state, target, lck_flags);
ret = gfs2_lm_lock(sdp, gl, target, lck_flags);
if (!(ret & LM_OUT_ASYNC)) {
finish_xmote(gl, ret);
@ -681,18 +654,6 @@ static void glock_work_func(struct work_struct *work)
gfs2_glock_put(gl);
}
static int gfs2_lm_get_lock(struct gfs2_sbd *sdp, struct lm_lockname *name,
void **lockp)
{
int error = -EIO;
if (!sdp->sd_lockstruct.ls_ops->lm_get_lock)
return 0;
if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
error = sdp->sd_lockstruct.ls_ops->lm_get_lock(
sdp->sd_lockstruct.ls_lockspace, name, lockp);
return error;
}
/**
* gfs2_glock_get() - Get a glock, or create one if one doesn't exist
* @sdp: The GFS2 superblock
@ -736,6 +697,9 @@ int gfs2_glock_get(struct gfs2_sbd *sdp, u64 number,
gl->gl_demote_state = LM_ST_EXCLUSIVE;
gl->gl_hash = hash;
gl->gl_ops = glops;
snprintf(gl->gl_strname, GDLM_STRNAME_BYTES, "%8x%16llx", name.ln_type, (unsigned long long)number);
memset(&gl->gl_lksb, 0, sizeof(struct dlm_lksb));
gl->gl_lksb.sb_lvbptr = gl->gl_lvb;
gl->gl_stamp = jiffies;
gl->gl_tchange = jiffies;
gl->gl_object = NULL;
@ -753,10 +717,6 @@ int gfs2_glock_get(struct gfs2_sbd *sdp, u64 number,
}
}
error = gfs2_lm_get_lock(sdp, &name, &gl->gl_lock);
if (error)
goto fail_aspace;
write_lock(gl_lock_addr(hash));
tmp = search_bucket(hash, sdp, &name);
if (tmp) {
@ -772,9 +732,6 @@ int gfs2_glock_get(struct gfs2_sbd *sdp, u64 number,
return 0;
fail_aspace:
if (gl->gl_aspace)
gfs2_aspace_put(gl->gl_aspace);
fail:
kmem_cache_free(gfs2_glock_cachep, gl);
return error;
@ -966,7 +923,7 @@ do_cancel:
if (!(gh->gh_flags & LM_FLAG_PRIORITY)) {
spin_unlock(&gl->gl_spin);
if (sdp->sd_lockstruct.ls_ops->lm_cancel)
sdp->sd_lockstruct.ls_ops->lm_cancel(gl->gl_lock);
sdp->sd_lockstruct.ls_ops->lm_cancel(gl);
spin_lock(&gl->gl_spin);
}
return;
@ -1240,70 +1197,13 @@ void gfs2_glock_dq_uninit_m(unsigned int num_gh, struct gfs2_holder *ghs)
gfs2_glock_dq_uninit(&ghs[x]);
}
static int gfs2_lm_hold_lvb(struct gfs2_sbd *sdp, void *lock, char **lvbp)
void gfs2_glock_cb(struct gfs2_glock *gl, unsigned int state)
{
int error = -EIO;
if (!sdp->sd_lockstruct.ls_ops->lm_hold_lvb)
return 0;
if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
error = sdp->sd_lockstruct.ls_ops->lm_hold_lvb(lock, lvbp);
return error;
}
/**
* gfs2_lvb_hold - attach a LVB from a glock
* @gl: The glock in question
*
*/
int gfs2_lvb_hold(struct gfs2_glock *gl)
{
int error;
if (!atomic_read(&gl->gl_lvb_count)) {
error = gfs2_lm_hold_lvb(gl->gl_sbd, gl->gl_lock, &gl->gl_lvb);
if (error)
return error;
gfs2_glock_hold(gl);
}
atomic_inc(&gl->gl_lvb_count);
return 0;
}
/**
* gfs2_lvb_unhold - detach a LVB from a glock
* @gl: The glock in question
*
*/
void gfs2_lvb_unhold(struct gfs2_glock *gl)
{
struct gfs2_sbd *sdp = gl->gl_sbd;
gfs2_glock_hold(gl);
gfs2_assert(gl->gl_sbd, atomic_read(&gl->gl_lvb_count) > 0);
if (atomic_dec_and_test(&gl->gl_lvb_count)) {
if (sdp->sd_lockstruct.ls_ops->lm_unhold_lvb)
sdp->sd_lockstruct.ls_ops->lm_unhold_lvb(gl->gl_lock, gl->gl_lvb);
gl->gl_lvb = NULL;
gfs2_glock_put(gl);
}
gfs2_glock_put(gl);
}
static void blocking_cb(struct gfs2_sbd *sdp, struct lm_lockname *name,
unsigned int state)
{
struct gfs2_glock *gl;
unsigned long delay = 0;
unsigned long holdtime;
unsigned long now = jiffies;
gl = gfs2_glock_find(sdp, name);
if (!gl)
return;
gfs2_glock_hold(gl);
holdtime = gl->gl_tchange + gl->gl_ops->go_min_hold_time;
if (time_before(now, holdtime))
delay = holdtime - now;
@ -1317,74 +1217,37 @@ static void blocking_cb(struct gfs2_sbd *sdp, struct lm_lockname *name,
gfs2_glock_put(gl);
}
static void gfs2_jdesc_make_dirty(struct gfs2_sbd *sdp, unsigned int jid)
{
struct gfs2_jdesc *jd;
spin_lock(&sdp->sd_jindex_spin);
list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
if (jd->jd_jid != jid)
continue;
jd->jd_dirty = 1;
break;
}
spin_unlock(&sdp->sd_jindex_spin);
}
/**
* gfs2_glock_cb - Callback used by locking module
* @sdp: Pointer to the superblock
* @type: Type of callback
* @data: Type dependent data pointer
* gfs2_glock_complete - Callback used by locking
* @gl: Pointer to the glock
* @ret: The return value from the dlm
*
* Called by the locking module when it wants to tell us something.
* Either we need to drop a lock, one of our ASYNC requests completed, or
* a journal from another client needs to be recovered.
*/
void gfs2_glock_cb(void *cb_data, unsigned int type, void *data)
void gfs2_glock_complete(struct gfs2_glock *gl, int ret)
{
struct gfs2_sbd *sdp = cb_data;
switch (type) {
case LM_CB_NEED_E:
blocking_cb(sdp, data, LM_ST_UNLOCKED);
return;
case LM_CB_NEED_D:
blocking_cb(sdp, data, LM_ST_DEFERRED);
return;
case LM_CB_NEED_S:
blocking_cb(sdp, data, LM_ST_SHARED);
return;
case LM_CB_ASYNC: {
struct lm_async_cb *async = data;
struct gfs2_glock *gl;
down_read(&gfs2_umount_flush_sem);
gl = gfs2_glock_find(sdp, &async->lc_name);
if (gfs2_assert_warn(sdp, gl))
struct lm_lockstruct *ls = &gl->gl_sbd->sd_lockstruct;
down_read(&gfs2_umount_flush_sem);
gl->gl_reply = ret;
if (unlikely(test_bit(DFL_BLOCK_LOCKS, &ls->ls_flags))) {
struct gfs2_holder *gh;
spin_lock(&gl->gl_spin);
gh = find_first_waiter(gl);
if ((!(gh && (gh->gh_flags & LM_FLAG_NOEXP)) &&
(gl->gl_target != LM_ST_UNLOCKED)) ||
((ret & ~LM_OUT_ST_MASK) != 0))
set_bit(GLF_FROZEN, &gl->gl_flags);
spin_unlock(&gl->gl_spin);
if (test_bit(GLF_FROZEN, &gl->gl_flags)) {
up_read(&gfs2_umount_flush_sem);
return;
gl->gl_reply = async->lc_ret;
set_bit(GLF_REPLY_PENDING, &gl->gl_flags);
if (queue_delayed_work(glock_workqueue, &gl->gl_work, 0) == 0)
gfs2_glock_put(gl);
up_read(&gfs2_umount_flush_sem);
return;
}
case LM_CB_NEED_RECOVERY:
gfs2_jdesc_make_dirty(sdp, *(unsigned int *)data);
if (sdp->sd_recoverd_process)
wake_up_process(sdp->sd_recoverd_process);
return;
default:
gfs2_assert_warn(sdp, 0);
return;
}
}
set_bit(GLF_REPLY_PENDING, &gl->gl_flags);
gfs2_glock_hold(gl);
if (queue_delayed_work(glock_workqueue, &gl->gl_work, 0) == 0)
gfs2_glock_put(gl);
up_read(&gfs2_umount_flush_sem);
}
/**
@ -1515,6 +1378,27 @@ out:
return has_entries;
}
/**
* thaw_glock - thaw out a glock which has an unprocessed reply waiting
* @gl: The glock to thaw
*
* N.B. When we freeze a glock, we leave a ref to the glock outstanding,
* so this has to result in the ref count being dropped by one.
*/
static void thaw_glock(struct gfs2_glock *gl)
{
if (!test_and_clear_bit(GLF_FROZEN, &gl->gl_flags))
return;
down_read(&gfs2_umount_flush_sem);
set_bit(GLF_REPLY_PENDING, &gl->gl_flags);
gfs2_glock_hold(gl);
if (queue_delayed_work(glock_workqueue, &gl->gl_work, 0) == 0)
gfs2_glock_put(gl);
up_read(&gfs2_umount_flush_sem);
}
/**
* clear_glock - look at a glock and see if we can free it from glock cache
* @gl: the glock to look at
@ -1539,6 +1423,20 @@ static void clear_glock(struct gfs2_glock *gl)
gfs2_glock_put(gl);
}
/**
* gfs2_glock_thaw - Thaw any frozen glocks
* @sdp: The super block
*
*/
void gfs2_glock_thaw(struct gfs2_sbd *sdp)
{
unsigned x;
for (x = 0; x < GFS2_GL_HASH_SIZE; x++)
examine_bucket(thaw_glock, sdp, x);
}
/**
* gfs2_gl_hash_clear - Empty out the glock hash table
* @sdp: the filesystem
@ -1619,7 +1517,7 @@ static const char *hflags2str(char *buf, unsigned flags, unsigned long iflags)
if (flags & LM_FLAG_NOEXP)
*p++ = 'e';
if (flags & LM_FLAG_ANY)
*p++ = 'a';
*p++ = 'A';
if (flags & LM_FLAG_PRIORITY)
*p++ = 'p';
if (flags & GL_ASYNC)
@ -1683,6 +1581,10 @@ static const char *gflags2str(char *buf, const unsigned long *gflags)
*p++ = 'i';
if (test_bit(GLF_REPLY_PENDING, gflags))
*p++ = 'r';
if (test_bit(GLF_INITIAL, gflags))
*p++ = 'i';
if (test_bit(GLF_FROZEN, gflags))
*p++ = 'F';
*p = 0;
return buf;
}
@ -1717,14 +1619,13 @@ static int __dump_glock(struct seq_file *seq, const struct gfs2_glock *gl)
dtime *= 1000000/HZ; /* demote time in uSec */
if (!test_bit(GLF_DEMOTE, &gl->gl_flags))
dtime = 0;
gfs2_print_dbg(seq, "G: s:%s n:%u/%llu f:%s t:%s d:%s/%llu l:%d a:%d r:%d\n",
gfs2_print_dbg(seq, "G: s:%s n:%u/%llu f:%s t:%s d:%s/%llu a:%d r:%d\n",
state2str(gl->gl_state),
gl->gl_name.ln_type,
(unsigned long long)gl->gl_name.ln_number,
gflags2str(gflags_buf, &gl->gl_flags),
state2str(gl->gl_target),
state2str(gl->gl_demote_state), dtime,
atomic_read(&gl->gl_lvb_count),
atomic_read(&gl->gl_ail_count),
atomic_read(&gl->gl_ref));

127
fs/gfs2/glock.h
View File

@ -11,15 +11,130 @@
#define __GLOCK_DOT_H__
#include <linux/sched.h>
#include <linux/parser.h>
#include "incore.h"
/* Flags for lock requests; used in gfs2_holder gh_flag field.
From lm_interface.h:
/* Options for hostdata parser */
enum {
Opt_jid,
Opt_id,
Opt_first,
Opt_nodir,
Opt_err,
};
/*
* lm_lockname types
*/
#define LM_TYPE_RESERVED 0x00
#define LM_TYPE_NONDISK 0x01
#define LM_TYPE_INODE 0x02
#define LM_TYPE_RGRP 0x03
#define LM_TYPE_META 0x04
#define LM_TYPE_IOPEN 0x05
#define LM_TYPE_FLOCK 0x06
#define LM_TYPE_PLOCK 0x07
#define LM_TYPE_QUOTA 0x08
#define LM_TYPE_JOURNAL 0x09
/*
* lm_lock() states
*
* SHARED is compatible with SHARED, not with DEFERRED or EX.
* DEFERRED is compatible with DEFERRED, not with SHARED or EX.
*/
#define LM_ST_UNLOCKED 0
#define LM_ST_EXCLUSIVE 1
#define LM_ST_DEFERRED 2
#define LM_ST_SHARED 3
/*
* lm_lock() flags
*
* LM_FLAG_TRY
* Don't wait to acquire the lock if it can't be granted immediately.
*
* LM_FLAG_TRY_1CB
* Send one blocking callback if TRY is set and the lock is not granted.
*
* LM_FLAG_NOEXP
* GFS sets this flag on lock requests it makes while doing journal recovery.
* These special requests should not be blocked due to the recovery like
* ordinary locks would be.
*
* LM_FLAG_ANY
* A SHARED request may also be granted in DEFERRED, or a DEFERRED request may
* also be granted in SHARED. The preferred state is whichever is compatible
* with other granted locks, or the specified state if no other locks exist.
*
* LM_FLAG_PRIORITY
* Override fairness considerations. Suppose a lock is held in a shared state
* and there is a pending request for the deferred state. A shared lock
* request with the priority flag would be allowed to bypass the deferred
* request and directly join the other shared lock. A shared lock request
* without the priority flag might be forced to wait until the deferred
* requested had acquired and released the lock.
*/
#define LM_FLAG_TRY 0x00000001
#define LM_FLAG_TRY_1CB 0x00000002
#define LM_FLAG_NOEXP 0x00000004
#define LM_FLAG_ANY 0x00000008
#define LM_FLAG_PRIORITY 0x00000010 */
#define LM_FLAG_PRIORITY 0x00000010
#define GL_ASYNC 0x00000040
#define GL_EXACT 0x00000080
#define GL_SKIP 0x00000100
#define GL_ATIME 0x00000200
#define GL_NOCACHE 0x00000400
/*
* lm_lock() and lm_async_cb return flags
*
* LM_OUT_ST_MASK
* Masks the lower two bits of lock state in the returned value.
*
* LM_OUT_CANCELED
* The lock request was canceled.
*
* LM_OUT_ASYNC
* The result of the request will be returned in an LM_CB_ASYNC callback.
*
*/
#define LM_OUT_ST_MASK 0x00000003
#define LM_OUT_CANCELED 0x00000008
#define LM_OUT_ASYNC 0x00000080
#define LM_OUT_ERROR 0x00000100
/*
* lm_recovery_done() messages
*/
#define LM_RD_GAVEUP 308
#define LM_RD_SUCCESS 309
#define GLR_TRYFAILED 13
struct lm_lockops {
const char *lm_proto_name;
int (*lm_mount) (struct gfs2_sbd *sdp, const char *fsname);
void (*lm_unmount) (struct gfs2_sbd *sdp);
void (*lm_withdraw) (struct gfs2_sbd *sdp);
void (*lm_put_lock) (struct kmem_cache *cachep, void *gl);
unsigned int (*lm_lock) (struct gfs2_glock *gl,
unsigned int req_state, unsigned int flags);
void (*lm_cancel) (struct gfs2_glock *gl);
const match_table_t *lm_tokens;
};
#define LM_FLAG_TRY 0x00000001
#define LM_FLAG_TRY_1CB 0x00000002
#define LM_FLAG_NOEXP 0x00000004
#define LM_FLAG_ANY 0x00000008
#define LM_FLAG_PRIORITY 0x00000010
#define GL_ASYNC 0x00000040
#define GL_EXACT 0x00000080
@ -128,10 +243,12 @@ static inline int gfs2_glock_nq_init(struct gfs2_glock *gl,
int gfs2_lvb_hold(struct gfs2_glock *gl);
void gfs2_lvb_unhold(struct gfs2_glock *gl);
void gfs2_glock_cb(void *cb_data, unsigned int type, void *data);
void gfs2_glock_cb(struct gfs2_glock *gl, unsigned int state);
void gfs2_glock_complete(struct gfs2_glock *gl, int ret);
void gfs2_reclaim_glock(struct gfs2_sbd *sdp);
void gfs2_gl_hash_clear(struct gfs2_sbd *sdp);
void gfs2_glock_finish_truncate(struct gfs2_inode *ip);
void gfs2_glock_thaw(struct gfs2_sbd *sdp);
int __init gfs2_glock_init(void);
void gfs2_glock_exit(void);
@ -141,4 +258,6 @@ void gfs2_delete_debugfs_file(struct gfs2_sbd *sdp);
int gfs2_register_debugfs(void);
void gfs2_unregister_debugfs(void);
extern const struct lm_lockops gfs2_dlm_ops;
#endif /* __GLOCK_DOT_H__ */

14
fs/gfs2/glops.c
View File

@ -12,7 +12,6 @@
#include <linux/completion.h>
#include <linux/buffer_head.h>
#include <linux/gfs2_ondisk.h>
#include <linux/lm_interface.h>
#include <linux/bio.h>
#include "gfs2.h"
@ -390,18 +389,6 @@ static int trans_go_demote_ok(const struct gfs2_glock *gl)
return 0;
}
/**
* quota_go_demote_ok - Check to see if it's ok to unlock a quota glock
* @gl: the glock
*
* Returns: 1 if it's ok
*/
static int quota_go_demote_ok(const struct gfs2_glock *gl)
{
return !atomic_read(&gl->gl_lvb_count);
}
const struct gfs2_glock_operations gfs2_meta_glops = {
.go_xmote_th = meta_go_sync,
.go_type = LM_TYPE_META,
@ -448,7 +435,6 @@ const struct gfs2_glock_operations gfs2_nondisk_glops = {
};
const struct gfs2_glock_operations gfs2_quota_glops = {
.go_demote_ok = quota_go_demote_ok,
.go_type = LM_TYPE_QUOTA,
};

59
fs/gfs2/incore.h
View File

@ -12,6 +12,8 @@
#include <linux/fs.h>
#include <linux/workqueue.h>
#include <linux/dlm.h>
#include <linux/buffer_head.h>
#define DIO_WAIT 0x00000010
#define DIO_METADATA 0x00000020
@ -26,6 +28,7 @@ struct gfs2_trans;
struct gfs2_ail;
struct gfs2_jdesc;
struct gfs2_sbd;
struct lm_lockops;
typedef void (*gfs2_glop_bh_t) (struct gfs2_glock *gl, unsigned int ret);
@ -121,6 +124,28 @@ struct gfs2_bufdata {
struct list_head bd_ail_gl_list;
};
/*
* Internally, we prefix things with gdlm_ and GDLM_ (for gfs-dlm) since a
* prefix of lock_dlm_ gets awkward.
*/
#define GDLM_STRNAME_BYTES 25
#define GDLM_LVB_SIZE 32
enum {
DFL_BLOCK_LOCKS = 0,
};
struct lm_lockname {
u64 ln_number;
unsigned int ln_type;
};
#define lm_name_equal(name1, name2) \
(((name1)->ln_number == (name2)->ln_number) && \
((name1)->ln_type == (name2)->ln_type))
struct gfs2_glock_operations {
void (*go_xmote_th) (struct gfs2_glock *gl);
int (*go_xmote_bh) (struct gfs2_glock *gl, struct gfs2_holder *gh);
@ -162,6 +187,8 @@ enum {
GLF_LFLUSH = 7,
GLF_INVALIDATE_IN_PROGRESS = 8,
GLF_REPLY_PENDING = 9,
GLF_INITIAL = 10,
GLF_FROZEN = 11,
};
struct gfs2_glock {
@ -181,10 +208,9 @@ struct gfs2_glock {
struct list_head gl_holders;
const struct gfs2_glock_operations *gl_ops;
void *gl_lock;
char *gl_lvb;
atomic_t gl_lvb_count;
char gl_strname[GDLM_STRNAME_BYTES];
struct dlm_lksb gl_lksb;
char gl_lvb[32];
unsigned long gl_stamp;
unsigned long gl_tchange;
void *gl_object;
@ -447,6 +473,30 @@ struct gfs2_sb_host {
char sb_locktable[GFS2_LOCKNAME_LEN];
};
/*
* lm_mount() return values
*
* ls_jid - the journal ID this node should use
* ls_first - this node is the first to mount the file system
* ls_lockspace - lock module's context for this file system
* ls_ops - lock module's functions
*/
struct lm_lockstruct {
u32 ls_id;
unsigned int ls_jid;
unsigned int ls_first;
unsigned int ls_first_done;
unsigned int ls_nodir;
const struct lm_lockops *ls_ops;
unsigned long ls_flags;
dlm_lockspace_t *ls_dlm;
int ls_recover_jid;
int ls_recover_jid_done;
int ls_recover_jid_status;
};
struct gfs2_sbd {
struct super_block *sd_vfs;
struct kobject sd_kobj;
@ -520,7 +570,6 @@ struct gfs2_sbd {
spinlock_t sd_jindex_spin;
struct mutex sd_jindex_mutex;
unsigned int sd_journals;
unsigned long sd_jindex_refresh_time;
struct gfs2_jdesc *sd_jdesc;
struct gfs2_holder sd_journal_gh;

13
fs/gfs2/inode.c
View File

@ -16,7 +16,6 @@
#include <linux/sort.h>
#include <linux/gfs2_ondisk.h>
#include <linux/crc32.h>
#include <linux/lm_interface.h>
#include <linux/security.h>
#include <linux/time.h>
@ -137,16 +136,16 @@ void gfs2_set_iop(struct inode *inode)
if (S_ISREG(mode)) {
inode->i_op = &gfs2_file_iops;
if (sdp->sd_args.ar_localflocks)
inode->i_fop = &gfs2_file_fops_nolock;
if (gfs2_localflocks(sdp))
inode->i_fop = gfs2_file_fops_nolock;
else
inode->i_fop = &gfs2_file_fops;
inode->i_fop = gfs2_file_fops;
} else if (S_ISDIR(mode)) {
inode->i_op = &gfs2_dir_iops;
if (sdp->sd_args.ar_localflocks)
inode->i_fop = &gfs2_dir_fops_nolock;
if (gfs2_localflocks(sdp))
inode->i_fop = gfs2_dir_fops_nolock;
else
inode->i_fop = &gfs2_dir_fops;
inode->i_fop = gfs2_dir_fops;
} else if (S_ISLNK(mode)) {
inode->i_op = &gfs2_symlink_iops;
} else {

22
fs/gfs2/inode.h
View File

@ -101,12 +101,26 @@ void gfs2_dinode_print(const struct gfs2_inode *ip);
extern const struct inode_operations gfs2_file_iops;
extern const struct inode_operations gfs2_dir_iops;
extern const struct inode_operations gfs2_symlink_iops;
extern const struct file_operations gfs2_file_fops;
extern const struct file_operations gfs2_dir_fops;
extern const struct file_operations gfs2_file_fops_nolock;
extern const struct file_operations gfs2_dir_fops_nolock;
extern const struct file_operations *gfs2_file_fops_nolock;
extern const struct file_operations *gfs2_dir_fops_nolock;
extern void gfs2_set_inode_flags(struct inode *inode);
#ifdef CONFIG_GFS2_FS_LOCKING_DLM
extern const struct file_operations *gfs2_file_fops;
extern const struct file_operations *gfs2_dir_fops;
static inline int gfs2_localflocks(const struct gfs2_sbd *sdp)
{
return sdp->sd_args.ar_localflocks;
}
#else /* Single node only */
#define gfs2_file_fops NULL
#define gfs2_dir_fops NULL
static inline int gfs2_localflocks(const struct gfs2_sbd *sdp)
{
return 1;
}
#endif /* CONFIG_GFS2_FS_LOCKING_DLM */
#endif /* __INODE_DOT_H__ */

240
fs/gfs2/lock_dlm.c Normal file
View File

@ -0,0 +1,240 @@
/*
* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
* Copyright (C) 2004-2009 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 version 2.
*/
#include <linux/fs.h>
#include <linux/dlm.h>
#include <linux/types.h>
#include <linux/gfs2_ondisk.h>
#include "incore.h"
#include "glock.h"
#include "util.h"
static void gdlm_ast(void *arg)
{
struct gfs2_glock *gl = arg;
unsigned ret = gl->gl_state;
BUG_ON(gl->gl_lksb.sb_flags & DLM_SBF_DEMOTED);
if (gl->gl_lksb.sb_flags & DLM_SBF_VALNOTVALID)
memset(gl->gl_lvb, 0, GDLM_LVB_SIZE);
switch (gl->gl_lksb.sb_status) {
case -DLM_EUNLOCK: /* Unlocked, so glock can be freed */
kmem_cache_free(gfs2_glock_cachep, gl);
return;
case -DLM_ECANCEL: /* Cancel while getting lock */
ret |= LM_OUT_CANCELED;
goto out;
case -EAGAIN: /* Try lock fails */
goto out;
case -EINVAL: /* Invalid */
case -ENOMEM: /* Out of memory */
ret |= LM_OUT_ERROR;
goto out;
case 0: /* Success */
break;
default: /* Something unexpected */
BUG();
}
ret = gl->gl_target;
if (gl->gl_lksb.sb_flags & DLM_SBF_ALTMODE) {
if (gl->gl_target == LM_ST_SHARED)
ret = LM_ST_DEFERRED;
else if (gl->gl_target == LM_ST_DEFERRED)
ret = LM_ST_SHARED;
else
BUG();
}
set_bit(GLF_INITIAL, &gl->gl_flags);
gfs2_glock_complete(gl, ret);
return;
out:
if (!test_bit(GLF_INITIAL, &gl->gl_flags))
gl->gl_lksb.sb_lkid = 0;
gfs2_glock_complete(gl, ret);
}
static void gdlm_bast(void *arg, int mode)
{
struct gfs2_glock *gl = arg;
switch (mode) {
case DLM_LOCK_EX:
gfs2_glock_cb(gl, LM_ST_UNLOCKED);
break;
case DLM_LOCK_CW:
gfs2_glock_cb(gl, LM_ST_DEFERRED);
break;
case DLM_LOCK_PR:
gfs2_glock_cb(gl, LM_ST_SHARED);
break;
default:
printk(KERN_ERR "unknown bast mode %d", mode);
BUG();
}
}
/* convert gfs lock-state to dlm lock-mode */
static int make_mode(const unsigned int lmstate)
{
switch (lmstate) {
case LM_ST_UNLOCKED:
return DLM_LOCK_NL;
case LM_ST_EXCLUSIVE:
return DLM_LOCK_EX;
case LM_ST_DEFERRED:
return DLM_LOCK_CW;
case LM_ST_SHARED:
return DLM_LOCK_PR;
}
printk(KERN_ERR "unknown LM state %d", lmstate);
BUG();
return -1;
}
static u32 make_flags(const u32 lkid, const unsigned int gfs_flags,
const int req)
{
u32 lkf = 0;
if (gfs_flags & LM_FLAG_TRY)
lkf |= DLM_LKF_NOQUEUE;
if (gfs_flags & LM_FLAG_TRY_1CB) {
lkf |= DLM_LKF_NOQUEUE;
lkf |= DLM_LKF_NOQUEUEBAST;
}
if (gfs_flags & LM_FLAG_PRIORITY) {
lkf |= DLM_LKF_NOORDER;
lkf |= DLM_LKF_HEADQUE;
}
if (gfs_flags & LM_FLAG_ANY) {
if (req == DLM_LOCK_PR)
lkf |= DLM_LKF_ALTCW;
else if (req == DLM_LOCK_CW)
lkf |= DLM_LKF_ALTPR;
else
BUG();
}
if (lkid != 0)
lkf |= DLM_LKF_CONVERT;
lkf |= DLM_LKF_VALBLK;
return lkf;
}
static unsigned int gdlm_lock(struct gfs2_glock *gl,
unsigned int req_state, unsigned int flags)
{
struct lm_lockstruct *ls = &gl->gl_sbd->sd_lockstruct;
int error;
int req;
u32 lkf;
req = make_mode(req_state);
lkf = make_flags(gl->gl_lksb.sb_lkid, flags, req);
/*
* Submit the actual lock request.
*/
error = dlm_lock(ls->ls_dlm, req, &gl->gl_lksb, lkf, gl->gl_strname,
GDLM_STRNAME_BYTES - 1, 0, gdlm_ast, gl, gdlm_bast);
if (error == -EAGAIN)
return 0;
if (error)
return LM_OUT_ERROR;
return LM_OUT_ASYNC;
}
static void gdlm_put_lock(struct kmem_cache *cachep, void *ptr)
{
struct gfs2_glock *gl = ptr;
struct lm_lockstruct *ls = &gl->gl_sbd->sd_lockstruct;
int error;
if (gl->gl_lksb.sb_lkid == 0) {
kmem_cache_free(cachep, gl);
return;
}
error = dlm_unlock(ls->ls_dlm, gl->gl_lksb.sb_lkid, DLM_LKF_VALBLK,
NULL, gl);
if (error) {
printk(KERN_ERR "gdlm_unlock %x,%llx err=%d\n",
gl->gl_name.ln_type,
(unsigned long long)gl->gl_name.ln_number, error);
return;
}
}
static void gdlm_cancel(struct gfs2_glock *gl)
{
struct lm_lockstruct *ls = &gl->gl_sbd->sd_lockstruct;
dlm_unlock(ls->ls_dlm, gl->gl_lksb.sb_lkid, DLM_LKF_CANCEL, NULL, gl);
}
static int gdlm_mount(struct gfs2_sbd *sdp, const char *fsname)
{
struct lm_lockstruct *ls = &sdp->sd_lockstruct;
int error;
if (fsname == NULL) {
fs_info(sdp, "no fsname found\n");
return -EINVAL;
}
error = dlm_new_lockspace(fsname, strlen(fsname), &ls->ls_dlm,
DLM_LSFL_FS | DLM_LSFL_NEWEXCL |
(ls->ls_nodir ? DLM_LSFL_NODIR : 0),
GDLM_LVB_SIZE);
if (error)
printk(KERN_ERR "dlm_new_lockspace error %d", error);
return error;
}
static void gdlm_unmount(struct gfs2_sbd *sdp)
{
struct lm_lockstruct *ls = &sdp->sd_lockstruct;
if (ls->ls_dlm) {
dlm_release_lockspace(ls->ls_dlm, 2);
ls->ls_dlm = NULL;
}
}
static const match_table_t dlm_tokens = {
{ Opt_jid, "jid=%d"},
{ Opt_id, "id=%d"},
{ Opt_first, "first=%d"},
{ Opt_nodir, "nodir=%d"},
{ Opt_err, NULL },
};
const struct lm_lockops gfs2_dlm_ops = {
.lm_proto_name = "lock_dlm",
.lm_mount = gdlm_mount,
.lm_unmount = gdlm_unmount,
.lm_put_lock = gdlm_put_lock,
.lm_lock = gdlm_lock,
.lm_cancel = gdlm_cancel,
.lm_tokens = &dlm_tokens,
};

314
fs/gfs2/locking.c
View File

@ -1,314 +0,0 @@
/*
* 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 version 2.
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/wait.h>
#include <linux/sched.h>
#include <linux/kmod.h>
#include <linux/fs.h>
#include <linux/delay.h>
#include <linux/lm_interface.h>
struct lmh_wrapper {
struct list_head lw_list;
const struct lm_lockops *lw_ops;
};
struct nolock_lockspace {
unsigned int nl_lvb_size;
};
/**
* nolock_get_lock - get a lm_lock_t given a descripton of the lock
* @lockspace: the lockspace the lock lives in
* @name: the name of the lock
* @lockp: return the lm_lock_t here
*
* Returns: 0 on success, -EXXX on failure
*/
static int nolock_get_lock(void *lockspace, struct lm_lockname *name,
void **lockp)
{
*lockp = lockspace;
return 0;
}
/**
* nolock_put_lock - get rid of a lock structure
* @lock: the lock to throw away
*
*/
static void nolock_put_lock(void *lock)
{
}
/**
* nolock_hold_lvb - hold on to a lock value block
* @lock: the lock the LVB is associated with
* @lvbp: return the lm_lvb_t here
*
* Returns: 0 on success, -EXXX on failure
*/
static int nolock_hold_lvb(void *lock, char **lvbp)
{
struct nolock_lockspace *nl = lock;
int error = 0;
*lvbp = kzalloc(nl->nl_lvb_size, GFP_KERNEL);
if (!*lvbp)
error = -ENOMEM;
return error;
}
/**
* nolock_unhold_lvb - release a LVB
* @lock: the lock the LVB is associated with
* @lvb: the lock value block
*
*/
static void nolock_unhold_lvb(void *lock, char *lvb)
{
kfree(lvb);
}
static int nolock_mount(char *table_name, char *host_data,
lm_callback_t cb, void *cb_data,
unsigned int min_lvb_size, int flags,
struct lm_lockstruct *lockstruct,
struct kobject *fskobj);
static void nolock_unmount(void *lockspace);
/* List of registered low-level locking protocols. A file system selects one
of them by name at mount time, e.g. lock_nolock, lock_dlm. */
static const struct lm_lockops nolock_ops = {
.lm_proto_name = "lock_nolock",
.lm_mount = nolock_mount,
.lm_unmount = nolock_unmount,
.lm_get_lock = nolock_get_lock,
.lm_put_lock = nolock_put_lock,
.lm_hold_lvb = nolock_hold_lvb,
.lm_unhold_lvb = nolock_unhold_lvb,
};
static struct lmh_wrapper nolock_proto = {
.lw_list = LIST_HEAD_INIT(nolock_proto.lw_list),
.lw_ops = &nolock_ops,
};
static LIST_HEAD(lmh_list);
static DEFINE_MUTEX(lmh_lock);
static int nolock_mount(char *table_name, char *host_data,
lm_callback_t cb, void *cb_data,
unsigned int min_lvb_size, int flags,
struct lm_lockstruct *lockstruct,
struct kobject *fskobj)
{
char *c;
unsigned int jid;
struct nolock_lockspace *nl;
c = strstr(host_data, "jid=");
if (!c)
jid = 0;
else {
c += 4;
sscanf(c, "%u", &jid);
}
nl = kzalloc(sizeof(struct nolock_lockspace), GFP_KERNEL);
if (!nl)
return -ENOMEM;
nl->nl_lvb_size = min_lvb_size;
lockstruct->ls_jid = jid;
lockstruct->ls_first = 1;
lockstruct->ls_lvb_size = min_lvb_size;
lockstruct->ls_lockspace = nl;
lockstruct->ls_ops = &nolock_ops;
lockstruct->ls_flags = LM_LSFLAG_LOCAL;
return 0;
}
static void nolock_unmount(void *lockspace)
{
struct nolock_lockspace *nl = lockspace;
kfree(nl);
}
/**
* gfs2_register_lockproto - Register a low-level locking protocol
* @proto: the protocol definition
*
* Returns: 0 on success, -EXXX on failure
*/
int gfs2_register_lockproto(const struct lm_lockops *proto)
{
struct lmh_wrapper *lw;
mutex_lock(&lmh_lock);
list_for_each_entry(lw, &lmh_list, lw_list) {
if (!strcmp(lw->lw_ops->lm_proto_name, proto->lm_proto_name)) {
mutex_unlock(&lmh_lock);
printk(KERN_INFO "GFS2: protocol %s already exists\n",
proto->lm_proto_name);
return -EEXIST;
}
}
lw = kzalloc(sizeof(struct lmh_wrapper), GFP_KERNEL);
if (!lw) {
mutex_unlock(&lmh_lock);
return -ENOMEM;
}
lw->lw_ops = proto;
list_add(&lw->lw_list, &lmh_list);
mutex_unlock(&lmh_lock);
return 0;
}
/**
* gfs2_unregister_lockproto - Unregister a low-level locking protocol
* @proto: the protocol definition
*
*/
void gfs2_unregister_lockproto(const struct lm_lockops *proto)
{
struct lmh_wrapper *lw;
mutex_lock(&lmh_lock);
list_for_each_entry(lw, &lmh_list, lw_list) {
if (!strcmp(lw->lw_ops->lm_proto_name, proto->lm_proto_name)) {
list_del(&lw->lw_list);
mutex_unlock(&lmh_lock);
kfree(lw);
return;
}
}
mutex_unlock(&lmh_lock);
printk(KERN_WARNING "GFS2: can't unregister lock protocol %s\n",
proto->lm_proto_name);
}
/**
* gfs2_mount_lockproto - Mount a lock protocol
* @proto_name - the name of the protocol
* @table_name - the name of the lock space
* @host_data - data specific to this host
* @cb - the callback to the code using the lock module
* @sdp - The GFS2 superblock
* @min_lvb_size - the mininum LVB size that the caller can deal with
* @flags - LM_MFLAG_*
* @lockstruct - a structure returned describing the mount
*
* Returns: 0 on success, -EXXX on failure
*/
int gfs2_mount_lockproto(char *proto_name, char *table_name, char *host_data,
lm_callback_t cb, void *cb_data,
unsigned int min_lvb_size, int flags,
struct lm_lockstruct *lockstruct,
struct kobject *fskobj)
{
struct lmh_wrapper *lw = NULL;
int try = 0;
int error, found;
retry:
mutex_lock(&lmh_lock);
if (list_empty(&nolock_proto.lw_list))
list_add(&nolock_proto.lw_list, &lmh_list);
found = 0;
list_for_each_entry(lw, &lmh_list, lw_list) {
if (!strcmp(lw->lw_ops->lm_proto_name, proto_name)) {
found = 1;
break;
}
}
if (!found) {
if (!try && capable(CAP_SYS_MODULE)) {
try = 1;
mutex_unlock(&lmh_lock);
request_module(proto_name);
goto retry;
}
printk(KERN_INFO "GFS2: can't find protocol %s\n", proto_name);
error = -ENOENT;
goto out;
}
if (lw->lw_ops->lm_owner &&
!try_module_get(lw->lw_ops->lm_owner)) {
try = 0;
mutex_unlock(&lmh_lock);
msleep(1000);
goto retry;
}
error = lw->lw_ops->lm_mount(table_name, host_data, cb, cb_data,
min_lvb_size, flags, lockstruct, fskobj);
if (error)
module_put(lw->lw_ops->lm_owner);
out:
mutex_unlock(&lmh_lock);
return error;
}
void gfs2_unmount_lockproto(struct lm_lockstruct *lockstruct)
{
mutex_lock(&lmh_lock);
if (lockstruct->ls_ops->lm_unmount)
lockstruct->ls_ops->lm_unmount(lockstruct->ls_lockspace);
if (lockstruct->ls_ops->lm_owner)
module_put(lockstruct->ls_ops->lm_owner);
mutex_unlock(&lmh_lock);
}
/**
* gfs2_withdraw_lockproto - abnormally unmount a lock module
* @lockstruct: the lockstruct passed into mount
*
*/
void gfs2_withdraw_lockproto(struct lm_lockstruct *lockstruct)
{
mutex_lock(&lmh_lock);
lockstruct->ls_ops->lm_withdraw(lockstruct->ls_lockspace);
if (lockstruct->ls_ops->lm_owner)
module_put(lockstruct->ls_ops->lm_owner);
mutex_unlock(&lmh_lock);
}
EXPORT_SYMBOL_GPL(gfs2_register_lockproto);
EXPORT_SYMBOL_GPL(gfs2_unregister_lockproto);

3
fs/gfs2/locking/dlm/Makefile
View File

@ -1,3 +0,0 @@
obj-$(CONFIG_GFS2_FS_LOCKING_DLM) += lock_dlm.o
lock_dlm-y := lock.o main.o mount.o sysfs.o thread.o

708
fs/gfs2/locking/dlm/lock.c
View File

@ -1,708 +0,0 @@
/*
* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
* Copyright (C) 2004-2005 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 version 2.
*/
#include "lock_dlm.h"
static char junk_lvb[GDLM_LVB_SIZE];
/* convert dlm lock-mode to gfs lock-state */
static s16 gdlm_make_lmstate(s16 dlmmode)
{
switch (dlmmode) {
case DLM_LOCK_IV:
case DLM_LOCK_NL:
return LM_ST_UNLOCKED;
case DLM_LOCK_EX:
return LM_ST_EXCLUSIVE;
case DLM_LOCK_CW:
return LM_ST_DEFERRED;
case DLM_LOCK_PR:
return LM_ST_SHARED;
}
gdlm_assert(0, "unknown DLM mode %d", dlmmode);
return -1;
}
/* A lock placed on this queue is re-submitted to DLM as soon as the lock_dlm
thread gets to it. */
static void queue_submit(struct gdlm_lock *lp)
{
struct gdlm_ls *ls = lp->ls;
spin_lock(&ls->async_lock);
list_add_tail(&lp->delay_list, &ls->submit);
spin_unlock(&ls->async_lock);
wake_up(&ls->thread_wait);
}
static void wake_up_ast(struct gdlm_lock *lp)
{
clear_bit(LFL_AST_WAIT, &lp->flags);
smp_mb__after_clear_bit();
wake_up_bit(&lp->flags, LFL_AST_WAIT);
}
static void gdlm_delete_lp(struct gdlm_lock *lp)
{
struct gdlm_ls *ls = lp->ls;
spin_lock(&ls->async_lock);
if (!list_empty(&lp->delay_list))
list_del_init(&lp->delay_list);
ls->all_locks_count--;
spin_unlock(&ls->async_lock);
kfree(lp);
}
static void gdlm_queue_delayed(struct gdlm_lock *lp)
{
struct gdlm_ls *ls = lp->ls;
spin_lock(&ls->async_lock);
list_add_tail(&lp->delay_list, &ls->delayed);
spin_unlock(&ls->async_lock);
}
static void process_complete(struct gdlm_lock *lp)
{
struct gdlm_ls *ls = lp->ls;
struct lm_async_cb acb;
memset(&acb, 0, sizeof(acb));
if (lp->lksb.sb_status == -DLM_ECANCEL) {
log_info("complete dlm cancel %x,%llx flags %lx",
lp->lockname.ln_type,
(unsigned long long)lp->lockname.ln_number,
lp->flags);
lp->req = lp->cur;
acb.lc_ret |= LM_OUT_CANCELED;
if (lp->cur == DLM_LOCK_IV)
lp->lksb.sb_lkid = 0;
goto out;
}
if (test_and_clear_bit(LFL_DLM_UNLOCK, &lp->flags)) {
if (lp->lksb.sb_status != -DLM_EUNLOCK) {
log_info("unlock sb_status %d %x,%llx flags %lx",
lp->lksb.sb_status, lp->lockname.ln_type,
(unsigned long long)lp->lockname.ln_number,
lp->flags);
return;
}
lp->cur = DLM_LOCK_IV;
lp->req = DLM_LOCK_IV;
lp->lksb.sb_lkid = 0;
if (test_and_clear_bit(LFL_UNLOCK_DELETE, &lp->flags)) {
gdlm_delete_lp(lp);
return;
}
goto out;
}
if (lp->lksb.sb_flags & DLM_SBF_VALNOTVALID)
memset(lp->lksb.sb_lvbptr, 0, GDLM_LVB_SIZE);
if (lp->lksb.sb_flags & DLM_SBF_ALTMODE) {
if (lp->req == DLM_LOCK_PR)
lp->req = DLM_LOCK_CW;
else if (lp->req == DLM_LOCK_CW)
lp->req = DLM_LOCK_PR;
}
/*
* A canceled lock request. The lock was just taken off the delayed
* list and was never even submitted to dlm.
*/
if (test_and_clear_bit(LFL_CANCEL, &lp->flags)) {
log_info("complete internal cancel %x,%llx",
lp->lockname.ln_type,
(unsigned long long)lp->lockname.ln_number);
lp->req = lp->cur;
acb.lc_ret |= LM_OUT_CANCELED;
goto out;
}
/*
* An error occured.
*/
if (lp->lksb.sb_status) {
/* a "normal" error */
if ((lp->lksb.sb_status == -EAGAIN) &&
(lp->lkf & DLM_LKF_NOQUEUE)) {
lp->req = lp->cur;
if (lp->cur == DLM_LOCK_IV)
lp->lksb.sb_lkid = 0;
goto out;
}
/* this could only happen with cancels I think */
log_info("ast sb_status %d %x,%llx flags %lx",
lp->lksb.sb_status, lp->lockname.ln_type,
(unsigned long long)lp->lockname.ln_number,
lp->flags);
return;
}
/*
* This is an AST for an EX->EX conversion for sync_lvb from GFS.
*/
if (test_and_clear_bit(LFL_SYNC_LVB, &lp->flags)) {
wake_up_ast(lp);
return;
}
/*
* A lock has been demoted to NL because it initially completed during
* BLOCK_LOCKS. Now it must be requested in the originally requested
* mode.
*/
if (test_and_clear_bit(LFL_REREQUEST, &lp->flags)) {
gdlm_assert(lp->req == DLM_LOCK_NL, "%x,%llx",
lp->lockname.ln_type,
(unsigned long long)lp->lockname.ln_number);
gdlm_assert(lp->prev_req > DLM_LOCK_NL, "%x,%llx",
lp->lockname.ln_type,
(unsigned long long)lp->lockname.ln_number);
lp->cur = DLM_LOCK_NL;
lp->req = lp->prev_req;
lp->prev_req = DLM_LOCK_IV;
lp->lkf &= ~DLM_LKF_CONVDEADLK;
set_bit(LFL_NOCACHE, &lp->flags);
if (test_bit(DFL_BLOCK_LOCKS, &ls->flags) &&
!test_bit(LFL_NOBLOCK, &lp->flags))
gdlm_queue_delayed(lp);
else
queue_submit(lp);
return;
}
/*
* A request is granted during dlm recovery. It may be granted
* because the locks of a failed node were cleared. In that case,
* there may be inconsistent data beneath this lock and we must wait
* for recovery to complete to use it. When gfs recovery is done this
* granted lock will be converted to NL and then reacquired in this
* granted state.
*/
if (test_bit(DFL_BLOCK_LOCKS, &ls->flags) &&
!test_bit(LFL_NOBLOCK, &lp->flags) &&
lp->req != DLM_LOCK_NL) {
lp->cur = lp->req;
lp->prev_req = lp->req;
lp->req = DLM_LOCK_NL;
lp->lkf |= DLM_LKF_CONVERT;
lp->lkf &= ~DLM_LKF_CONVDEADLK;
log_debug("rereq %x,%llx id %x %d,%d",
lp->lockname.ln_type,
(unsigned long long)lp->lockname.ln_number,
lp->lksb.sb_lkid, lp->cur, lp->req);
set_bit(LFL_REREQUEST, &lp->flags);
queue_submit(lp);
return;
}
/*
* DLM demoted the lock to NL before it was granted so GFS must be
* told it cannot cache data for this lock.
*/
if (lp->lksb.sb_flags & DLM_SBF_DEMOTED)
set_bit(LFL_NOCACHE, &lp->flags);
out:
/*
* This is an internal lock_dlm lock
*/
if (test_bit(LFL_INLOCK, &lp->flags)) {
clear_bit(LFL_NOBLOCK, &lp->flags);
lp->cur = lp->req;
wake_up_ast(lp);
return;
}
/*
* Normal completion of a lock request. Tell GFS it now has the lock.
*/
clear_bit(LFL_NOBLOCK, &lp->flags);
lp->cur = lp->req;
acb.lc_name = lp->lockname;
acb.lc_ret |= gdlm_make_lmstate(lp->cur);
ls->fscb(ls->sdp, LM_CB_ASYNC, &acb);
}
static void gdlm_ast(void *astarg)
{
struct gdlm_lock *lp = astarg;
clear_bit(LFL_ACTIVE, &lp->flags);
process_complete(lp);
}
static void process_blocking(struct gdlm_lock *lp, int bast_mode)
{
struct gdlm_ls *ls = lp->ls;
unsigned int cb = 0;
switch (gdlm_make_lmstate(bast_mode)) {
case LM_ST_EXCLUSIVE:
cb = LM_CB_NEED_E;
break;
case LM_ST_DEFERRED:
cb = LM_CB_NEED_D;
break;
case LM_ST_SHARED:
cb = LM_CB_NEED_S;
break;
default:
gdlm_assert(0, "unknown bast mode %u", bast_mode);
}
ls->fscb(ls->sdp, cb, &lp->lockname);
}
static void gdlm_bast(void *astarg, int mode)
{
struct gdlm_lock *lp = astarg;
if (!mode) {
printk(KERN_INFO "lock_dlm: bast mode zero %x,%llx\n",
lp->lockname.ln_type,
(unsigned long long)lp->lockname.ln_number);
return;
}
process_blocking(lp, mode);
}
/* convert gfs lock-state to dlm lock-mode */
static s16 make_mode(s16 lmstate)
{
switch (lmstate) {
case LM_ST_UNLOCKED:
return DLM_LOCK_NL;
case LM_ST_EXCLUSIVE:
return DLM_LOCK_EX;
case LM_ST_DEFERRED:
return DLM_LOCK_CW;
case LM_ST_SHARED:
return DLM_LOCK_PR;
}
gdlm_assert(0, "unknown LM state %d", lmstate);
return -1;
}
/* verify agreement with GFS on the current lock state, NB: DLM_LOCK_NL and
DLM_LOCK_IV are both considered LM_ST_UNLOCKED by GFS. */
static void check_cur_state(struct gdlm_lock *lp, unsigned int cur_state)
{
s16 cur = make_mode(cur_state);
if (lp->cur != DLM_LOCK_IV)
gdlm_assert(lp->cur == cur, "%d, %d", lp->cur, cur);
}
static inline unsigned int make_flags(struct gdlm_lock *lp,
unsigned int gfs_flags,
s16 cur, s16 req)
{
unsigned int lkf = 0;
if (gfs_flags & LM_FLAG_TRY)
lkf |= DLM_LKF_NOQUEUE;
if (gfs_flags & LM_FLAG_TRY_1CB) {
lkf |= DLM_LKF_NOQUEUE;
lkf |= DLM_LKF_NOQUEUEBAST;
}
if (gfs_flags & LM_FLAG_PRIORITY) {
lkf |= DLM_LKF_NOORDER;
lkf |= DLM_LKF_HEADQUE;
}
if (gfs_flags & LM_FLAG_ANY) {
if (req == DLM_LOCK_PR)
lkf |= DLM_LKF_ALTCW;
else if (req == DLM_LOCK_CW)
lkf |= DLM_LKF_ALTPR;
}
if (lp->lksb.sb_lkid != 0) {
lkf |= DLM_LKF_CONVERT;
}
if (lp->lvb)
lkf |= DLM_LKF_VALBLK;
return lkf;
}
/* make_strname - convert GFS lock numbers to a string */
static inline void make_strname(const struct lm_lockname *lockname,
struct gdlm_strname *str)
{
sprintf(str->name, "%8x%16llx", lockname->ln_type,
(unsigned long long)lockname->ln_number);
str->namelen = GDLM_STRNAME_BYTES;
}
static int gdlm_create_lp(struct gdlm_ls *ls, struct lm_lockname *name,
struct gdlm_lock **lpp)
{
struct gdlm_lock *lp;
lp = kzalloc(sizeof(struct gdlm_lock), GFP_NOFS);
if (!lp)
return -ENOMEM;
lp->lockname = *name;
make_strname(name, &lp->strname);
lp->ls = ls;
lp->cur = DLM_LOCK_IV;
INIT_LIST_HEAD(&lp->delay_list);
spin_lock(&ls->async_lock);
ls->all_locks_count++;
spin_unlock(&ls->async_lock);
*lpp = lp;
return 0;
}
int gdlm_get_lock(void *lockspace, struct lm_lockname *name,
void **lockp)
{
struct gdlm_lock *lp;
int error;
error = gdlm_create_lp(lockspace, name, &lp);
*lockp = lp;
return error;
}
void gdlm_put_lock(void *lock)
{
gdlm_delete_lp(lock);
}
unsigned int gdlm_do_lock(struct gdlm_lock *lp)
{
struct gdlm_ls *ls = lp->ls;
int error, bast = 1;
/*
* When recovery is in progress, delay lock requests for submission
* once recovery is done. Requests for recovery (NOEXP) and unlocks
* can pass.
*/
if (test_bit(DFL_BLOCK_LOCKS, &ls->flags) &&
!test_bit(LFL_NOBLOCK, &lp->flags) && lp->req != DLM_LOCK_NL) {
gdlm_queue_delayed(lp);
return LM_OUT_ASYNC;
}
/*
* Submit the actual lock request.
*/
if (test_bit(LFL_NOBAST, &lp->flags))
bast = 0;
set_bit(LFL_ACTIVE, &lp->flags);
log_debug("lk %x,%llx id %x %d,%d %x", lp->lockname.ln_type,
(unsigned long long)lp->lockname.ln_number, lp->lksb.sb_lkid,
lp->cur, lp->req, lp->lkf);
error = dlm_lock(ls->dlm_lockspace, lp->req, &lp->lksb, lp->lkf,
lp->strname.name, lp->strname.namelen, 0, gdlm_ast,
lp, bast ? gdlm_bast : NULL);
if ((error == -EAGAIN) && (lp->lkf & DLM_LKF_NOQUEUE)) {
lp->lksb.sb_status = -EAGAIN;
gdlm_ast(lp);
error = 0;
}
if (error) {
log_error("%s: gdlm_lock %x,%llx err=%d cur=%d req=%d lkf=%x "
"flags=%lx", ls->fsname, lp->lockname.ln_type,
(unsigned long long)lp->lockname.ln_number, error,
lp->cur, lp->req, lp->lkf, lp->flags);
return LM_OUT_ERROR;
}
return LM_OUT_ASYNC;
}
static unsigned int gdlm_do_unlock(struct gdlm_lock *lp)
{
struct gdlm_ls *ls = lp->ls;
unsigned int lkf = 0;
int error;
set_bit(LFL_DLM_UNLOCK, &lp->flags);
set_bit(LFL_ACTIVE, &lp->flags);
if (lp->lvb)
lkf = DLM_LKF_VALBLK;
log_debug("un %x,%llx %x %d %x", lp->lockname.ln_type,
(unsigned long long)lp->lockname.ln_number,
lp->lksb.sb_lkid, lp->cur, lkf);
error = dlm_unlock(ls->dlm_lockspace, lp->lksb.sb_lkid, lkf, NULL, lp);
if (error) {
log_error("%s: gdlm_unlock %x,%llx err=%d cur=%d req=%d lkf=%x "
"flags=%lx", ls->fsname, lp->lockname.ln_type,
(unsigned long long)lp->lockname.ln_number, error,
lp->cur, lp->req, lp->lkf, lp->flags);
return LM_OUT_ERROR;
}
return LM_OUT_ASYNC;
}
unsigned int gdlm_lock(void *lock, unsigned int cur_state,
unsigned int req_state, unsigned int flags)
{
struct gdlm_lock *lp = lock;
if (req_state == LM_ST_UNLOCKED)
return gdlm_unlock(lock, cur_state);
if (req_state == LM_ST_UNLOCKED)
return gdlm_unlock(lock, cur_state);
clear_bit(LFL_DLM_CANCEL, &lp->flags);
if (flags & LM_FLAG_NOEXP)
set_bit(LFL_NOBLOCK, &lp->flags);
check_cur_state(lp, cur_state);
lp->req = make_mode(req_state);
lp->lkf = make_flags(lp, flags, lp->cur, lp->req);
return gdlm_do_lock(lp);
}
unsigned int gdlm_unlock(void *lock, unsigned int cur_state)
{
struct gdlm_lock *lp = lock;
clear_bit(LFL_DLM_CANCEL, &lp->flags);
if (lp->cur == DLM_LOCK_IV)
return 0;
return gdlm_do_unlock(lp);
}
void gdlm_cancel(void *lock)
{
struct gdlm_lock *lp = lock;
struct gdlm_ls *ls = lp->ls;
int error, delay_list = 0;
if (test_bit(LFL_DLM_CANCEL, &lp->flags))
return;
log_info("gdlm_cancel %x,%llx flags %lx", lp->lockname.ln_type,
(unsigned long long)lp->lockname.ln_number, lp->flags);
spin_lock(&ls->async_lock);
if (!list_empty(&lp->delay_list)) {
list_del_init(&lp->delay_list);
delay_list = 1;
}
spin_unlock(&ls->async_lock);
if (delay_list) {
set_bit(LFL_CANCEL, &lp->flags);
set_bit(LFL_ACTIVE, &lp->flags);
gdlm_ast(lp);
return;
}
if (!test_bit(LFL_ACTIVE, &lp->flags) ||
test_bit(LFL_DLM_UNLOCK, &lp->flags)) {
log_info("gdlm_cancel skip %x,%llx flags %lx",
lp->lockname.ln_type,
(unsigned long long)lp->lockname.ln_number, lp->flags);
return;
}
/* the lock is blocked in the dlm */
set_bit(LFL_DLM_CANCEL, &lp->flags);
set_bit(LFL_ACTIVE, &lp->flags);
error = dlm_unlock(ls->dlm_lockspace, lp->lksb.sb_lkid, DLM_LKF_CANCEL,
NULL, lp);
log_info("gdlm_cancel rv %d %x,%llx flags %lx", error,
lp->lockname.ln_type,
(unsigned long long)lp->lockname.ln_number, lp->flags);
if (error == -EBUSY)
clear_bit(LFL_DLM_CANCEL, &lp->flags);
}
static int gdlm_add_lvb(struct gdlm_lock *lp)
{
char *lvb;
lvb = kzalloc(GDLM_LVB_SIZE, GFP_NOFS);
if (!lvb)
return -ENOMEM;
lp->lksb.sb_lvbptr = lvb;
lp->lvb = lvb;
return 0;
}
static void gdlm_del_lvb(struct gdlm_lock *lp)
{
kfree(lp->lvb);
lp->lvb = NULL;
lp->lksb.sb_lvbptr = NULL;
}
static int gdlm_ast_wait(void *word)
{
schedule();
return 0;
}
/* This can do a synchronous dlm request (requiring a lock_dlm thread to get
the completion) because gfs won't call hold_lvb() during a callback (from
the context of a lock_dlm thread). */
static int hold_null_lock(struct gdlm_lock *lp)
{
struct gdlm_lock *lpn = NULL;
int error;
if (lp->hold_null) {
printk(KERN_INFO "lock_dlm: lvb already held\n");
return 0;
}
error = gdlm_create_lp(lp->ls, &lp->lockname, &lpn);
if (error)
goto out;
lpn->lksb.sb_lvbptr = junk_lvb;
lpn->lvb = junk_lvb;
lpn->req = DLM_LOCK_NL;
lpn->lkf = DLM_LKF_VALBLK | DLM_LKF_EXPEDITE;
set_bit(LFL_NOBAST, &lpn->flags);
set_bit(LFL_INLOCK, &lpn->flags);
set_bit(LFL_AST_WAIT, &lpn->flags);
gdlm_do_lock(lpn);
wait_on_bit(&lpn->flags, LFL_AST_WAIT, gdlm_ast_wait, TASK_UNINTERRUPTIBLE);
error = lpn->lksb.sb_status;
if (error) {
printk(KERN_INFO "lock_dlm: hold_null_lock dlm error %d\n",
error);
gdlm_delete_lp(lpn);
lpn = NULL;
}
out:
lp->hold_null = lpn;
return error;
}
/* This cannot do a synchronous dlm request (requiring a lock_dlm thread to get
the completion) because gfs may call unhold_lvb() during a callback (from
the context of a lock_dlm thread) which could cause a deadlock since the
other lock_dlm thread could be engaged in recovery. */
static void unhold_null_lock(struct gdlm_lock *lp)
{
struct gdlm_lock *lpn = lp->hold_null;
gdlm_assert(lpn, "%x,%llx", lp->lockname.ln_type,
(unsigned long long)lp->lockname.ln_number);
lpn->lksb.sb_lvbptr = NULL;
lpn->lvb = NULL;
set_bit(LFL_UNLOCK_DELETE, &lpn->flags);
gdlm_do_unlock(lpn);
lp->hold_null = NULL;
}
/* Acquire a NL lock because gfs requires the value block to remain
intact on the resource while the lvb is "held" even if it's holding no locks
on the resource. */
int gdlm_hold_lvb(void *lock, char **lvbp)
{
struct gdlm_lock *lp = lock;
int error;
error = gdlm_add_lvb(lp);
if (error)
return error;
*lvbp = lp->lvb;
error = hold_null_lock(lp);
if (error)
gdlm_del_lvb(lp);
return error;
}
void gdlm_unhold_lvb(void *lock, char *lvb)
{
struct gdlm_lock *lp = lock;
unhold_null_lock(lp);
gdlm_del_lvb(lp);
}
void gdlm_submit_delayed(struct gdlm_ls *ls)
{
struct gdlm_lock *lp, *safe;
spin_lock(&ls->async_lock);
list_for_each_entry_safe(lp, safe, &ls->delayed, delay_list) {
list_del_init(&lp->delay_list);
list_add_tail(&lp->delay_list, &ls->submit);
}
spin_unlock(&ls->async_lock);
wake_up(&ls->thread_wait);
}

166
fs/gfs2/locking/dlm/lock_dlm.h
View File

@ -1,166 +0,0 @@
/*
* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
* Copyright (C) 2004-2005 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 version 2.
*/
#ifndef LOCK_DLM_DOT_H
#define LOCK_DLM_DOT_H
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/list.h>
#include <linux/socket.h>
#include <linux/delay.h>
#include <linux/kthread.h>
#include <linux/kobject.h>
#include <linux/fcntl.h>
#include <linux/wait.h>
#include <net/sock.h>
#include <linux/dlm.h>
#include <linux/dlm_plock.h>
#include <linux/lm_interface.h>
/*
* Internally, we prefix things with gdlm_ and GDLM_ (for gfs-dlm) since a
* prefix of lock_dlm_ gets awkward. Externally, GFS refers to this module
* as "lock_dlm".
*/
#define GDLM_STRNAME_BYTES 24
#define GDLM_LVB_SIZE 32
#define GDLM_DROP_COUNT 0
#define GDLM_DROP_PERIOD 60
#define GDLM_NAME_LEN 128
/* GFS uses 12 bytes to identify a resource (32 bit type + 64 bit number).
We sprintf these numbers into a 24 byte string of hex values to make them
human-readable (to make debugging simpler.) */
struct gdlm_strname {
unsigned char name[GDLM_STRNAME_BYTES];
unsigned short namelen;
};
enum {
DFL_BLOCK_LOCKS = 0,
DFL_SPECTATOR = 1,
DFL_WITHDRAW = 2,
};
struct gdlm_ls {
u32 id;
int jid;
int first;
int first_done;
unsigned long flags;
struct kobject kobj;
char clustername[GDLM_NAME_LEN];
char fsname[GDLM_NAME_LEN];
int fsflags;
dlm_lockspace_t *dlm_lockspace;
lm_callback_t fscb;
struct gfs2_sbd *sdp;
int recover_jid;
int recover_jid_done;
int recover_jid_status;
spinlock_t async_lock;
struct list_head delayed;
struct list_head submit;
u32 all_locks_count;
wait_queue_head_t wait_control;
struct task_struct *thread;
wait_queue_head_t thread_wait;
};
enum {
LFL_NOBLOCK = 0,
LFL_NOCACHE = 1,
LFL_DLM_UNLOCK = 2,
LFL_DLM_CANCEL = 3,
LFL_SYNC_LVB = 4,
LFL_FORCE_PROMOTE = 5,
LFL_REREQUEST = 6,
LFL_ACTIVE = 7,
LFL_INLOCK = 8,
LFL_CANCEL = 9,
LFL_NOBAST = 10,
LFL_HEADQUE = 11,
LFL_UNLOCK_DELETE = 12,
LFL_AST_WAIT = 13,
};
struct gdlm_lock {
struct gdlm_ls *ls;
struct lm_lockname lockname;
struct gdlm_strname strname;
char *lvb;
struct dlm_lksb lksb;
s16 cur;
s16 req;
s16 prev_req;
u32 lkf; /* dlm flags DLM_LKF_ */
unsigned long flags; /* lock_dlm flags LFL_ */
struct list_head delay_list; /* delayed */
struct gdlm_lock *hold_null; /* NL lock for hold_lvb */
};
#define gdlm_assert(assertion, fmt, args...) \
do { \
if (unlikely(!(assertion))) { \
printk(KERN_EMERG "lock_dlm: fatal assertion failed \"%s\"\n" \
"lock_dlm: " fmt "\n", \
#assertion, ##args); \
BUG(); \
} \
} while (0)
#define log_print(lev, fmt, arg...) printk(lev "lock_dlm: " fmt "\n" , ## arg)
#define log_info(fmt, arg...) log_print(KERN_INFO , fmt , ## arg)
#define log_error(fmt, arg...) log_print(KERN_ERR , fmt , ## arg)
#ifdef LOCK_DLM_LOG_DEBUG
#define log_debug(fmt, arg...) log_print(KERN_DEBUG , fmt , ## arg)
#else
#define log_debug(fmt, arg...)
#endif
/* sysfs.c */
int gdlm_sysfs_init(void);
void gdlm_sysfs_exit(void);
int gdlm_kobject_setup(struct gdlm_ls *, struct kobject *);
void gdlm_kobject_release(struct gdlm_ls *);
/* thread.c */
int gdlm_init_threads(struct gdlm_ls *);
void gdlm_release_threads(struct gdlm_ls *);
/* lock.c */
void gdlm_submit_delayed(struct gdlm_ls *);
unsigned int gdlm_do_lock(struct gdlm_lock *);
int gdlm_get_lock(void *, struct lm_lockname *, void **);
void gdlm_put_lock(void *);
unsigned int gdlm_lock(void *, unsigned int, unsigned int, unsigned int);
unsigned int gdlm_unlock(void *, unsigned int);
void gdlm_cancel(void *);
int gdlm_hold_lvb(void *, char **);
void gdlm_unhold_lvb(void *, char *);
/* mount.c */
extern const struct lm_lockops gdlm_ops;
#endif

48
fs/gfs2/locking/dlm/main.c
View File

@ -1,48 +0,0 @@
/*
* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
* Copyright (C) 2004-2005 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 version 2.
*/
#include <linux/init.h>
#include "lock_dlm.h"
static int __init init_lock_dlm(void)
{
int error;
error = gfs2_register_lockproto(&gdlm_ops);
if (error) {
printk(KERN_WARNING "lock_dlm: can't register protocol: %d\n",
error);
return error;
}
error = gdlm_sysfs_init();
if (error) {
gfs2_unregister_lockproto(&gdlm_ops);
return error;
}
printk(KERN_INFO
"Lock_DLM (built %s %s) installed\n", __DATE__, __TIME__);
return 0;
}
static void __exit exit_lock_dlm(void)
{
gdlm_sysfs_exit();
gfs2_unregister_lockproto(&gdlm_ops);
}
module_init(init_lock_dlm);
module_exit(exit_lock_dlm);
MODULE_DESCRIPTION("GFS DLM Locking Module");
MODULE_AUTHOR("Red Hat, Inc.");
MODULE_LICENSE("GPL");

276
fs/gfs2/locking/dlm/mount.c
View File

@ -1,276 +0,0 @@
/*
* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
* Copyright (C) 2004-2005 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 version 2.
*/
#include "lock_dlm.h"
const struct lm_lockops gdlm_ops;
static struct gdlm_ls *init_gdlm(lm_callback_t cb, struct gfs2_sbd *sdp,
int flags, char *table_name)
{
struct gdlm_ls *ls;
char buf[256], *p;
ls = kzalloc(sizeof(struct gdlm_ls), GFP_KERNEL);
if (!ls)
return NULL;
ls->fscb = cb;
ls->sdp = sdp;
ls->fsflags = flags;
spin_lock_init(&ls->async_lock);
INIT_LIST_HEAD(&ls->delayed);
INIT_LIST_HEAD(&ls->submit);
init_waitqueue_head(&ls->thread_wait);
init_waitqueue_head(&ls->wait_control);
ls->jid = -1;
strncpy(buf, table_name, 256);
buf[255] = '\0';
p = strchr(buf, ':');
if (!p) {
log_info("invalid table_name \"%s\"", table_name);
kfree(ls);
return NULL;
}
*p = '\0';
p++;
strncpy(ls->clustername, buf, GDLM_NAME_LEN);
strncpy(ls->fsname, p, GDLM_NAME_LEN);
return ls;
}
static int make_args(struct gdlm_ls *ls, char *data_arg, int *nodir)
{
char data[256];
char *options, *x, *y;
int error = 0;
memset(data, 0, 256);
strncpy(data, data_arg, 255);
if (!strlen(data)) {
log_error("no mount options, (u)mount helpers not installed");
return -EINVAL;
}
for (options = data; (x = strsep(&options, ":")); ) {
if (!*x)
continue;
y = strchr(x, '=');
if (y)
*y++ = 0;
if (!strcmp(x, "jid")) {
if (!y) {
log_error("need argument to jid");
error = -EINVAL;
break;
}
sscanf(y, "%u", &ls->jid);
} else if (!strcmp(x, "first")) {
if (!y) {
log_error("need argument to first");
error = -EINVAL;
break;
}
sscanf(y, "%u", &ls->first);
} else if (!strcmp(x, "id")) {
if (!y) {
log_error("need argument to id");
error = -EINVAL;
break;
}
sscanf(y, "%u", &ls->id);
} else if (!strcmp(x, "nodir")) {
if (!y) {
log_error("need argument to nodir");
error = -EINVAL;
break;
}
sscanf(y, "%u", nodir);
} else {
log_error("unkonwn option: %s", x);
error = -EINVAL;
break;
}
}
return error;
}
static int gdlm_mount(char *table_name, char *host_data,
lm_callback_t cb, void *cb_data,
unsigned int min_lvb_size, int flags,
struct lm_lockstruct *lockstruct,
struct kobject *fskobj)
{
struct gdlm_ls *ls;
int error = -ENOMEM, nodir = 0;
if (min_lvb_size > GDLM_LVB_SIZE)
goto out;
ls = init_gdlm(cb, cb_data, flags, table_name);
if (!ls)
goto out;
error = make_args(ls, host_data, &nodir);
if (error)
goto out;
error = gdlm_init_threads(ls);
if (error)
goto out_free;
error = gdlm_kobject_setup(ls, fskobj);
if (error)
goto out_thread;
error = dlm_new_lockspace(ls->fsname, strlen(ls->fsname),
&ls->dlm_lockspace,
DLM_LSFL_FS | DLM_LSFL_NEWEXCL |
(nodir ? DLM_LSFL_NODIR : 0),
GDLM_LVB_SIZE);
if (error) {
log_error("dlm_new_lockspace error %d", error);
goto out_kobj;
}
lockstruct->ls_jid = ls->jid;
lockstruct->ls_first = ls->first;
lockstruct->ls_lockspace = ls;
lockstruct->ls_ops = &gdlm_ops;
lockstruct->ls_flags = 0;
lockstruct->ls_lvb_size = GDLM_LVB_SIZE;
return 0;
out_kobj:
gdlm_kobject_release(ls);
out_thread:
gdlm_release_threads(ls);
out_free:
kfree(ls);
out:
return error;
}
static void gdlm_unmount(void *lockspace)
{
struct gdlm_ls *ls = lockspace;
log_debug("unmount flags %lx", ls->flags);
/* FIXME: serialize unmount and withdraw in case they
happen at once. Also, if unmount follows withdraw,
wait for withdraw to finish. */
if (test_bit(DFL_WITHDRAW, &ls->flags))
goto out;
gdlm_kobject_release(ls);
dlm_release_lockspace(ls->dlm_lockspace, 2);
gdlm_release_threads(ls);
BUG_ON(ls->all_locks_count);
out:
kfree(ls);
}
static void gdlm_recovery_done(void *lockspace, unsigned int jid,
unsigned int message)
{
char env_jid[20];
char env_status[20];
char *envp[] = { env_jid, env_status, NULL };
struct gdlm_ls *ls = lockspace;
ls->recover_jid_done = jid;
ls->recover_jid_status = message;
sprintf(env_jid, "JID=%d", jid);
sprintf(env_status, "RECOVERY=%s",
message == LM_RD_SUCCESS ? "Done" : "Failed");
kobject_uevent_env(&ls->kobj, KOBJ_CHANGE, envp);
}
static void gdlm_others_may_mount(void *lockspace)
{
char *message = "FIRSTMOUNT=Done";
char *envp[] = { message, NULL };
struct gdlm_ls *ls = lockspace;
ls->first_done = 1;
kobject_uevent_env(&ls->kobj, KOBJ_CHANGE, envp);
}
/* Userspace gets the offline uevent, blocks new gfs locks on
other mounters, and lets us know (sets WITHDRAW flag). Then,
userspace leaves the mount group while we leave the lockspace. */
static void gdlm_withdraw(void *lockspace)
{
struct gdlm_ls *ls = lockspace;
kobject_uevent(&ls->kobj, KOBJ_OFFLINE);
wait_event_interruptible(ls->wait_control,
test_bit(DFL_WITHDRAW, &ls->flags));
dlm_release_lockspace(ls->dlm_lockspace, 2);
gdlm_release_threads(ls);
gdlm_kobject_release(ls);
}
static int gdlm_plock(void *lockspace, struct lm_lockname *name,
struct file *file, int cmd, struct file_lock *fl)
{
struct gdlm_ls *ls = lockspace;
return dlm_posix_lock(ls->dlm_lockspace, name->ln_number, file, cmd, fl);
}
static int gdlm_punlock(void *lockspace, struct lm_lockname *name,
struct file *file, struct file_lock *fl)
{
struct gdlm_ls *ls = lockspace;
return dlm_posix_unlock(ls->dlm_lockspace, name->ln_number, file, fl);
}
static int gdlm_plock_get(void *lockspace, struct lm_lockname *name,
struct file *file, struct file_lock *fl)
{
struct gdlm_ls *ls = lockspace;
return dlm_posix_get(ls->dlm_lockspace, name->ln_number, file, fl);
}
const struct lm_lockops gdlm_ops = {
.lm_proto_name = "lock_dlm",
.lm_mount = gdlm_mount,
.lm_others_may_mount = gdlm_others_may_mount,
.lm_unmount = gdlm_unmount,
.lm_withdraw = gdlm_withdraw,
.lm_get_lock = gdlm_get_lock,
.lm_put_lock = gdlm_put_lock,
.lm_lock = gdlm_lock,
.lm_unlock = gdlm_unlock,
.lm_plock = gdlm_plock,
.lm_punlock = gdlm_punlock,
.lm_plock_get = gdlm_plock_get,
.lm_cancel = gdlm_cancel,
.lm_hold_lvb = gdlm_hold_lvb,
.lm_unhold_lvb = gdlm_unhold_lvb,
.lm_recovery_done = gdlm_recovery_done,
.lm_owner = THIS_MODULE,
};

226
fs/gfs2/locking/dlm/sysfs.c
View File

@ -1,226 +0,0 @@
/*
* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
* Copyright (C) 2004-2005 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 version 2.
*/
#include <linux/ctype.h>
#include <linux/stat.h>
#include "lock_dlm.h"
static ssize_t proto_name_show(struct gdlm_ls *ls, char *buf)
{
return sprintf(buf, "%s\n", gdlm_ops.lm_proto_name);
}
static ssize_t block_show(struct gdlm_ls *ls, char *buf)
{
ssize_t ret;
int val = 0;
if (test_bit(DFL_BLOCK_LOCKS, &ls->flags))
val = 1;
ret = sprintf(buf, "%d\n", val);
return ret;
}
static ssize_t block_store(struct gdlm_ls *ls, const char *buf, size_t len)
{
ssize_t ret = len;
int val;
val = simple_strtol(buf, NULL, 0);
if (val == 1)
set_bit(DFL_BLOCK_LOCKS, &ls->flags);
else if (val == 0) {
clear_bit(DFL_BLOCK_LOCKS, &ls->flags);
gdlm_submit_delayed(ls);
} else {
ret = -EINVAL;
}
return ret;
}
static ssize_t withdraw_show(struct gdlm_ls *ls, char *buf)
{
ssize_t ret;
int val = 0;
if (test_bit(DFL_WITHDRAW, &ls->flags))
val = 1;
ret = sprintf(buf, "%d\n", val);
return ret;
}
static ssize_t withdraw_store(struct gdlm_ls *ls, const char *buf, size_t len)
{
ssize_t ret = len;
int val;
val = simple_strtol(buf, NULL, 0);
if (val == 1)
set_bit(DFL_WITHDRAW, &ls->flags);
else
ret = -EINVAL;
wake_up(&ls->wait_control);
return ret;
}
static ssize_t id_show(struct gdlm_ls *ls, char *buf)
{
return sprintf(buf, "%u\n", ls->id);
}
static ssize_t jid_show(struct gdlm_ls *ls, char *buf)
{
return sprintf(buf, "%d\n", ls->jid);
}
static ssize_t first_show(struct gdlm_ls *ls, char *buf)
{
return sprintf(buf, "%d\n", ls->first);
}
static ssize_t first_done_show(struct gdlm_ls *ls, char *buf)
{
return sprintf(buf, "%d\n", ls->first_done);
}
static ssize_t recover_show(struct gdlm_ls *ls, char *buf)
{
return sprintf(buf, "%d\n", ls->recover_jid);
}
static ssize_t recover_store(struct gdlm_ls *ls, const char *buf, size_t len)
{
ls->recover_jid = simple_strtol(buf, NULL, 0);
ls->fscb(ls->sdp, LM_CB_NEED_RECOVERY, &ls->recover_jid);
return len;
}
static ssize_t recover_done_show(struct gdlm_ls *ls, char *buf)
{
return sprintf(buf, "%d\n", ls->recover_jid_done);
}
static ssize_t recover_status_show(struct gdlm_ls *ls, char *buf)
{
return sprintf(buf, "%d\n", ls->recover_jid_status);
}
struct gdlm_attr {
struct attribute attr;
ssize_t (*show)(struct gdlm_ls *, char *);
ssize_t (*store)(struct gdlm_ls *, const char *, size_t);
};
#define GDLM_ATTR(_name,_mode,_show,_store) \
static struct gdlm_attr gdlm_attr_##_name = __ATTR(_name,_mode,_show,_store)
GDLM_ATTR(proto_name, 0444, proto_name_show, NULL);
GDLM_ATTR(block, 0644, block_show, block_store);
GDLM_ATTR(withdraw, 0644, withdraw_show, withdraw_store);
GDLM_ATTR(id, 0444, id_show, NULL);
GDLM_ATTR(jid, 0444, jid_show, NULL);
GDLM_ATTR(first, 0444, first_show, NULL);
GDLM_ATTR(first_done, 0444, first_done_show, NULL);
GDLM_ATTR(recover, 0644, recover_show, recover_store);
GDLM_ATTR(recover_done, 0444, recover_done_show, NULL);
GDLM_ATTR(recover_status, 0444, recover_status_show, NULL);
static struct attribute *gdlm_attrs[] = {
&gdlm_attr_proto_name.attr,
&gdlm_attr_block.attr,
&gdlm_attr_withdraw.attr,
&gdlm_attr_id.attr,
&gdlm_attr_jid.attr,
&gdlm_attr_first.attr,
&gdlm_attr_first_done.attr,
&gdlm_attr_recover.attr,
&gdlm_attr_recover_done.attr,
&gdlm_attr_recover_status.attr,
NULL,
};
static ssize_t gdlm_attr_show(struct kobject *kobj, struct attribute *attr,
char *buf)
{
struct gdlm_ls *ls = container_of(kobj, struct gdlm_ls, kobj);
struct gdlm_attr *a = container_of(attr, struct gdlm_attr, attr);
return a->show ? a->show(ls, buf) : 0;
}
static ssize_t gdlm_attr_store(struct kobject *kobj, struct attribute *attr,
const char *buf, size_t len)
{
struct gdlm_ls *ls = container_of(kobj, struct gdlm_ls, kobj);
struct gdlm_attr *a = container_of(attr, struct gdlm_attr, attr);
return a->store ? a->store(ls, buf, len) : len;
}
static struct sysfs_ops gdlm_attr_ops = {
.show = gdlm_attr_show,
.store = gdlm_attr_store,
};
static struct kobj_type gdlm_ktype = {
.default_attrs = gdlm_attrs,
.sysfs_ops = &gdlm_attr_ops,
};
static struct kset *gdlm_kset;
int gdlm_kobject_setup(struct gdlm_ls *ls, struct kobject *fskobj)
{
int error;
ls->kobj.kset = gdlm_kset;
error = kobject_init_and_add(&ls->kobj, &gdlm_ktype, fskobj,
"lock_module");
if (error)
log_error("can't register kobj %d", error);
kobject_uevent(&ls->kobj, KOBJ_ADD);
return error;
}
void gdlm_kobject_release(struct gdlm_ls *ls)
{
kobject_put(&ls->kobj);
}
static int gdlm_uevent(struct kset *kset, struct kobject *kobj,
struct kobj_uevent_env *env)
{
struct gdlm_ls *ls = container_of(kobj, struct gdlm_ls, kobj);
add_uevent_var(env, "LOCKTABLE=%s:%s", ls->clustername, ls->fsname);
add_uevent_var(env, "LOCKPROTO=lock_dlm");
return 0;
}
static struct kset_uevent_ops gdlm_uevent_ops = {
.uevent = gdlm_uevent,
};
int gdlm_sysfs_init(void)
{
gdlm_kset = kset_create_and_add("lock_dlm", &gdlm_uevent_ops, kernel_kobj);
if (!gdlm_kset) {
printk(KERN_WARNING "%s: can not create kset\n", __func__);
return -ENOMEM;
}
return 0;
}
void gdlm_sysfs_exit(void)
{
kset_unregister(gdlm_kset);
}

68
fs/gfs2/locking/dlm/thread.c
View File

@ -1,68 +0,0 @@
/*
* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
* Copyright (C) 2004-2005 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 version 2.
*/
#include "lock_dlm.h"
static inline int no_work(struct gdlm_ls *ls)
{
int ret;
spin_lock(&ls->async_lock);
ret = list_empty(&ls->submit);
spin_unlock(&ls->async_lock);
return ret;
}
static int gdlm_thread(void *data)
{
struct gdlm_ls *ls = (struct gdlm_ls *) data;
struct gdlm_lock *lp = NULL;
while (!kthread_should_stop()) {
wait_event_interruptible(ls->thread_wait,
!no_work(ls) || kthread_should_stop());
spin_lock(&ls->async_lock);
if (!list_empty(&ls->submit)) {
lp = list_entry(ls->submit.next, struct gdlm_lock,
delay_list);
list_del_init(&lp->delay_list);
spin_unlock(&ls->async_lock);
gdlm_do_lock(lp);
spin_lock(&ls->async_lock);
}
spin_unlock(&ls->async_lock);
}
return 0;
}
int gdlm_init_threads(struct gdlm_ls *ls)
{
struct task_struct *p;
int error;
p = kthread_run(gdlm_thread, ls, "lock_dlm");
error = IS_ERR(p);
if (error) {
log_error("can't start lock_dlm thread %d", error);
return error;
}
ls->thread = p;
return 0;
}
void gdlm_release_threads(struct gdlm_ls *ls)
{
kthread_stop(ls->thread);
}

1
fs/gfs2/log.c
View File

@ -14,7 +14,6 @@
#include <linux/buffer_head.h>
#include <linux/gfs2_ondisk.h>
#include <linux/crc32.h>
#include <linux/lm_interface.h>
#include <linux/delay.h>
#include <linux/kthread.h>
#include <linux/freezer.h>

1
fs/gfs2/lops.c
View File

@ -13,7 +13,6 @@
#include <linux/completion.h>
#include <linux/buffer_head.h>
#include <linux/gfs2_ondisk.h>
#include <linux/lm_interface.h>
#include "gfs2.h"
#include "incore.h"

3
fs/gfs2/main.c
View File

@ -14,7 +14,6 @@
#include <linux/module.h>
#include <linux/init.h>
#include <linux/gfs2_ondisk.h>
#include <linux/lm_interface.h>
#include <asm/atomic.h>
#include "gfs2.h"
@ -47,8 +46,6 @@ static void gfs2_init_glock_once(void *foo)
INIT_HLIST_NODE(&gl->gl_list);
spin_lock_init(&gl->gl_spin);
INIT_LIST_HEAD(&gl->gl_holders);
gl->gl_lvb = NULL;
atomic_set(&gl->gl_lvb_count, 0);
INIT_LIST_HEAD(&gl->gl_lru);
INIT_LIST_HEAD(&gl->gl_ail_list);
atomic_set(&gl->gl_ail_count, 0);

1
fs/gfs2/meta_io.c
View File

@ -19,7 +19,6 @@
#include <linux/delay.h>
#include <linux/bio.h>
#include <linux/gfs2_ondisk.h>
#include <linux/lm_interface.h>
#include "gfs2.h"
#include "incore.h"

1
fs/gfs2/mount.c
View File

@ -12,7 +12,6 @@
#include <linux/completion.h>
#include <linux/buffer_head.h>
#include <linux/gfs2_ondisk.h>
#include <linux/lm_interface.h>
#include <linux/parser.h>
#include "gfs2.h"

1
fs/gfs2/ops_address.c
View File

@ -19,7 +19,6 @@
#include <linux/writeback.h>
#include <linux/swap.h>
#include <linux/gfs2_ondisk.h>
#include <linux/lm_interface.h>
#include <linux/backing-dev.h>
#include "gfs2.h"

1
fs/gfs2/ops_dentry.c
View File

@ -13,7 +13,6 @@
#include <linux/buffer_head.h>
#include <linux/gfs2_ondisk.h>
#include <linux/crc32.h>
#include <linux/lm_interface.h>
#include "gfs2.h"
#include "incore.h"

1
fs/gfs2/ops_export.c
View File

@ -14,7 +14,6 @@
#include <linux/exportfs.h>
#include <linux/gfs2_ondisk.h>
#include <linux/crc32.h>
#include <linux/lm_interface.h>
#include "gfs2.h"
#include "incore.h"

74
fs/gfs2/ops_file.c
View File

@ -20,9 +20,10 @@
#include <linux/gfs2_ondisk.h>
#include <linux/ext2_fs.h>
#include <linux/crc32.h>
#include <linux/lm_interface.h>
#include <linux/writeback.h>
#include <asm/uaccess.h>
#include <linux/dlm.h>
#include <linux/dlm_plock.h>
#include "gfs2.h"
#include "incore.h"
@ -560,57 +561,24 @@ static int gfs2_fsync(struct file *file, struct dentry *dentry, int datasync)
return ret;
}
#ifdef CONFIG_GFS2_FS_LOCKING_DLM
/**
* gfs2_setlease - acquire/release a file lease
* @file: the file pointer
* @arg: lease type
* @fl: file lock
*
* We don't currently have a way to enforce a lease across the whole
* cluster; until we do, disable leases (by just returning -EINVAL),
* unless the administrator has requested purely local locking.
*
* Returns: errno
*/
static int gfs2_setlease(struct file *file, long arg, struct file_lock **fl)
{
struct gfs2_sbd *sdp = GFS2_SB(file->f_mapping->host);
/*
* We don't currently have a way to enforce a lease across the whole
* cluster; until we do, disable leases (by just returning -EINVAL),
* unless the administrator has requested purely local locking.
*/
if (!sdp->sd_args.ar_localflocks)
return -EINVAL;
return generic_setlease(file, arg, fl);
}
static int gfs2_lm_plock_get(struct gfs2_sbd *sdp, struct lm_lockname *name,
struct file *file, struct file_lock *fl)
{
int error = -EIO;
if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
error = sdp->sd_lockstruct.ls_ops->lm_plock_get(
sdp->sd_lockstruct.ls_lockspace, name, file, fl);
return error;
}
static int gfs2_lm_plock(struct gfs2_sbd *sdp, struct lm_lockname *name,
struct file *file, int cmd, struct file_lock *fl)
{
int error = -EIO;
if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
error = sdp->sd_lockstruct.ls_ops->lm_plock(
sdp->sd_lockstruct.ls_lockspace, name, file, cmd, fl);
return error;
}
static int gfs2_lm_punlock(struct gfs2_sbd *sdp, struct lm_lockname *name,
struct file *file, struct file_lock *fl)
{
int error = -EIO;
if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
error = sdp->sd_lockstruct.ls_ops->lm_punlock(
sdp->sd_lockstruct.ls_lockspace, name, file, fl);
return error;
return -EINVAL;
}
/**
@ -626,9 +594,7 @@ static int gfs2_lock(struct file *file, int cmd, struct file_lock *fl)
{
struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
struct gfs2_sbd *sdp = GFS2_SB(file->f_mapping->host);
struct lm_lockname name =
{ .ln_number = ip->i_no_addr,
.ln_type = LM_TYPE_PLOCK };
struct lm_lockstruct *ls = &sdp->sd_lockstruct;
if (!(fl->fl_flags & FL_POSIX))
return -ENOLCK;
@ -640,12 +606,14 @@ static int gfs2_lock(struct file *file, int cmd, struct file_lock *fl)
cmd = F_SETLK;
fl->fl_type = F_UNLCK;
}
if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
return -EIO;
if (IS_GETLK(cmd))
return gfs2_lm_plock_get(sdp, &name, file, fl);
return dlm_posix_get(ls->ls_dlm, ip->i_no_addr, file, fl);
else if (fl->fl_type == F_UNLCK)
return gfs2_lm_punlock(sdp, &name, file, fl);
return dlm_posix_unlock(ls->ls_dlm, ip->i_no_addr, file, fl);
else
return gfs2_lm_plock(sdp, &name, file, cmd, fl);
return dlm_posix_lock(ls->ls_dlm, ip->i_no_addr, file, cmd, fl);
}
static int do_flock(struct file *file, int cmd, struct file_lock *fl)
@ -732,7 +700,7 @@ static int gfs2_flock(struct file *file, int cmd, struct file_lock *fl)
}
}
const struct file_operations gfs2_file_fops = {
const struct file_operations *gfs2_file_fops = &(const struct file_operations){
.llseek = gfs2_llseek,
.read = do_sync_read,
.aio_read = generic_file_aio_read,
@ -750,7 +718,7 @@ const struct file_operations gfs2_file_fops = {
.setlease = gfs2_setlease,
};
const struct file_operations gfs2_dir_fops = {
const struct file_operations *gfs2_dir_fops = &(const struct file_operations){
.readdir = gfs2_readdir,
.unlocked_ioctl = gfs2_ioctl,
.open = gfs2_open,
@ -760,7 +728,9 @@ const struct file_operations gfs2_dir_fops = {
.flock = gfs2_flock,
};
const struct file_operations gfs2_file_fops_nolock = {
#endif /* CONFIG_GFS2_FS_LOCKING_DLM */
const struct file_operations *gfs2_file_fops_nolock = &(const struct file_operations){
.llseek = gfs2_llseek,
.read = do_sync_read,
.aio_read = generic_file_aio_read,
@ -773,10 +743,10 @@ const struct file_operations gfs2_file_fops_nolock = {
.fsync = gfs2_fsync,
.splice_read = generic_file_splice_read,
.splice_write = generic_file_splice_write,
.setlease = gfs2_setlease,
.setlease = generic_setlease,
};
const struct file_operations gfs2_dir_fops_nolock = {
const struct file_operations *gfs2_dir_fops_nolock = &(const struct file_operations){
.readdir = gfs2_readdir,
.unlocked_ioctl = gfs2_ioctl,
.open = gfs2_open,

134
fs/gfs2/ops_fstype.c
View File

@ -17,7 +17,6 @@
#include <linux/namei.h>
#include <linux/mount.h>
#include <linux/gfs2_ondisk.h>
#include <linux/lm_interface.h>
#include "gfs2.h"
#include "incore.h"
@ -627,13 +626,13 @@ static int map_journal_extents(struct gfs2_sbd *sdp)
return rc;
}
static void gfs2_lm_others_may_mount(struct gfs2_sbd *sdp)
static void gfs2_others_may_mount(struct gfs2_sbd *sdp)
{
if (!sdp->sd_lockstruct.ls_ops->lm_others_may_mount)
return;
if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
sdp->sd_lockstruct.ls_ops->lm_others_may_mount(
sdp->sd_lockstruct.ls_lockspace);
char *message = "FIRSTMOUNT=Done";
char *envp[] = { message, NULL };
struct lm_lockstruct *ls = &sdp->sd_lockstruct;
ls->ls_first_done = 1;
kobject_uevent_env(&sdp->sd_kobj, KOBJ_CHANGE, envp);
}
/**
@ -793,7 +792,7 @@ static int init_journal(struct gfs2_sbd *sdp, int undo)
}
}
gfs2_lm_others_may_mount(sdp);
gfs2_others_may_mount(sdp);
} else if (!sdp->sd_args.ar_spectator) {
error = gfs2_recover_journal(sdp->sd_jdesc);
if (error) {
@ -1002,7 +1001,6 @@ static int init_threads(struct gfs2_sbd *sdp, int undo)
goto fail_quotad;
sdp->sd_log_flush_time = jiffies;
sdp->sd_jindex_refresh_time = jiffies;
p = kthread_run(gfs2_logd, sdp, "gfs2_logd");
error = IS_ERR(p);
@ -1030,6 +1028,17 @@ fail:
return error;
}
static const match_table_t nolock_tokens = {
{ Opt_jid, "jid=%d\n", },
{ Opt_err, NULL },
};
static const struct lm_lockops nolock_ops = {
.lm_proto_name = "lock_nolock",
.lm_put_lock = kmem_cache_free,
.lm_tokens = &nolock_tokens,
};
/**
* gfs2_lm_mount - mount a locking protocol
* @sdp: the filesystem
@ -1041,31 +1050,73 @@ fail:
static int gfs2_lm_mount(struct gfs2_sbd *sdp, int silent)
{
char *proto = sdp->sd_proto_name;
char *table = sdp->sd_table_name;
int flags = LM_MFLAG_CONV_NODROP;
int error;
const struct lm_lockops *lm;
struct lm_lockstruct *ls = &sdp->sd_lockstruct;
struct gfs2_args *args = &sdp->sd_args;
const char *proto = sdp->sd_proto_name;
const char *table = sdp->sd_table_name;
const char *fsname;
char *o, *options;
int ret;
if (sdp->sd_args.ar_spectator)
flags |= LM_MFLAG_SPECTATOR;
if (!strcmp("lock_nolock", proto)) {
lm = &nolock_ops;
sdp->sd_args.ar_localflocks = 1;
sdp->sd_args.ar_localcaching = 1;
#ifdef CONFIG_GFS2_FS_LOCKING_DLM
} else if (!strcmp("lock_dlm", proto)) {
lm = &gfs2_dlm_ops;
#endif
} else {
printk(KERN_INFO "GFS2: can't find protocol %s\n", proto);
return -ENOENT;
}
fs_info(sdp, "Trying to join cluster \"%s\", \"%s\"\n", proto, table);
error = gfs2_mount_lockproto(proto, table, sdp->sd_args.ar_hostdata,
gfs2_glock_cb, sdp,
GFS2_MIN_LVB_SIZE, flags,
&sdp->sd_lockstruct, &sdp->sd_kobj);
if (error) {
fs_info(sdp, "can't mount proto=%s, table=%s, hostdata=%s\n",
proto, table, sdp->sd_args.ar_hostdata);
goto out;
}
ls->ls_ops = lm;
ls->ls_first = 1;
ls->ls_id = 0;
if (gfs2_assert_warn(sdp, sdp->sd_lockstruct.ls_ops) ||
gfs2_assert_warn(sdp, sdp->sd_lockstruct.ls_lvb_size >=
GFS2_MIN_LVB_SIZE)) {
gfs2_unmount_lockproto(&sdp->sd_lockstruct);
goto out;
for (options = args->ar_hostdata; (o = strsep(&options, ":")); ) {
substring_t tmp[MAX_OPT_ARGS];
int token, option;
if (!o || !*o)
continue;
token = match_token(o, *lm->lm_tokens, tmp);
switch (token) {
case Opt_jid:
ret = match_int(&tmp[0], &option);
if (ret || option < 0)
goto hostdata_error;
ls->ls_jid = option;
break;
case Opt_id:
ret = match_int(&tmp[0], &option);
if (ret)
goto hostdata_error;
ls->ls_id = option;
break;
case Opt_first:
ret = match_int(&tmp[0], &option);
if (ret || (option != 0 && option != 1))
goto hostdata_error;
ls->ls_first = option;
break;
case Opt_nodir:
ret = match_int(&tmp[0], &option);
if (ret || (option != 0 && option != 1))
goto hostdata_error;
ls->ls_nodir = option;
break;
case Opt_err:
default:
hostdata_error:
fs_info(sdp, "unknown hostdata (%s)\n", o);
return -EINVAL;
}
}
if (sdp->sd_args.ar_spectator)
@ -1074,22 +1125,25 @@ static int gfs2_lm_mount(struct gfs2_sbd *sdp, int silent)
snprintf(sdp->sd_fsname, GFS2_FSNAME_LEN, "%s.%u", table,
sdp->sd_lockstruct.ls_jid);
fs_info(sdp, "Joined cluster. Now mounting FS...\n");
if ((sdp->sd_lockstruct.ls_flags & LM_LSFLAG_LOCAL) &&
!sdp->sd_args.ar_ignore_local_fs) {
sdp->sd_args.ar_localflocks = 1;
sdp->sd_args.ar_localcaching = 1;
fsname = strchr(table, ':');
if (fsname)
fsname++;
if (lm->lm_mount == NULL) {
fs_info(sdp, "Now mounting FS...\n");
return 0;
}
out:
return error;
ret = lm->lm_mount(sdp, fsname);
if (ret == 0)
fs_info(sdp, "Joined cluster. Now mounting FS...\n");
return ret;
}
void gfs2_lm_unmount(struct gfs2_sbd *sdp)
{
if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
gfs2_unmount_lockproto(&sdp->sd_lockstruct);
const struct lm_lockops *lm = sdp->sd_lockstruct.ls_ops;
if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) &&
lm->lm_unmount)
lm->lm_unmount(sdp);
}
/**

1
fs/gfs2/ops_inode.c
View File

@ -18,7 +18,6 @@
#include <linux/posix_acl.h>
#include <linux/gfs2_ondisk.h>
#include <linux/crc32.h>
#include <linux/lm_interface.h>
#include <linux/fiemap.h>
#include <asm/uaccess.h>

1
fs/gfs2/ops_super.c
View File

@ -19,7 +19,6 @@
#include <linux/delay.h>
#include <linux/gfs2_ondisk.h>
#include <linux/crc32.h>
#include <linux/lm_interface.h>
#include <linux/time.h>
#include "gfs2.h"

12
fs/gfs2/quota.c
View File

@ -45,7 +45,6 @@
#include <linux/fs.h>
#include <linux/bio.h>
#include <linux/gfs2_ondisk.h>
#include <linux/lm_interface.h>
#include <linux/kthread.h>
#include <linux/freezer.h>
@ -108,7 +107,7 @@ int gfs2_shrink_qd_memory(int nr, gfp_t gfp_mask)
gfs2_assert_warn(sdp, !qd->qd_slot_count);
gfs2_assert_warn(sdp, !qd->qd_bh_count);
gfs2_lvb_unhold(qd->qd_gl);
gfs2_glock_put(qd->qd_gl);
atomic_dec(&sdp->sd_quota_count);
/* Delete it from the common reclaim list */
@ -157,11 +156,6 @@ static int qd_alloc(struct gfs2_sbd *sdp, int user, u32 id,
if (error)
goto fail;
error = gfs2_lvb_hold(qd->qd_gl);
gfs2_glock_put(qd->qd_gl);
if (error)
goto fail;
*qdp = qd;
return 0;
@ -211,7 +205,7 @@ static int qd_get(struct gfs2_sbd *sdp, int user, u32 id, int create,
if (qd || !create) {
if (new_qd) {
gfs2_lvb_unhold(new_qd->qd_gl);
gfs2_glock_put(new_qd->qd_gl);
kmem_cache_free(gfs2_quotad_cachep, new_qd);
}
*qdp = qd;
@ -1280,7 +1274,7 @@ void gfs2_quota_cleanup(struct gfs2_sbd *sdp)
gfs2_assert_warn(sdp, qd->qd_slot_count == 1);
gfs2_assert_warn(sdp, !qd->qd_bh_count);
gfs2_lvb_unhold(qd->qd_gl);
gfs2_glock_put(qd->qd_gl);
kmem_cache_free(gfs2_quotad_cachep, qd);
spin_lock(&qd_lru_lock);

28
fs/gfs2/recovery.c
View File

@ -13,7 +13,6 @@
#include <linux/buffer_head.h>
#include <linux/gfs2_ondisk.h>
#include <linux/crc32.h>
#include <linux/lm_interface.h>
#include <linux/kthread.h>
#include <linux/freezer.h>
@ -427,20 +426,23 @@ static int clean_journal(struct gfs2_jdesc *jd, struct gfs2_log_header_host *hea
}
static void gfs2_lm_recovery_done(struct gfs2_sbd *sdp, unsigned int jid,
unsigned int message)
static void gfs2_recovery_done(struct gfs2_sbd *sdp, unsigned int jid,
unsigned int message)
{
if (!sdp->sd_lockstruct.ls_ops->lm_recovery_done)
return;
if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
sdp->sd_lockstruct.ls_ops->lm_recovery_done(
sdp->sd_lockstruct.ls_lockspace, jid, message);
char env_jid[20];
char env_status[20];
char *envp[] = { env_jid, env_status, NULL };
struct lm_lockstruct *ls = &sdp->sd_lockstruct;
ls->ls_recover_jid_done = jid;
ls->ls_recover_jid_status = message;
sprintf(env_jid, "JID=%d", jid);
sprintf(env_status, "RECOVERY=%s",
message == LM_RD_SUCCESS ? "Done" : "Failed");
kobject_uevent_env(&sdp->sd_kobj, KOBJ_CHANGE, envp);
}
/**
* gfs2_recover_journal - recovery a given journal
* gfs2_recover_journal - recover a given journal
* @jd: the struct gfs2_jdesc describing the journal
*
* Acquire the journal's lock, check to see if the journal is clean, and
@ -561,7 +563,7 @@ int gfs2_recover_journal(struct gfs2_jdesc *jd)
if (jd->jd_jid != sdp->sd_lockstruct.ls_jid)
gfs2_glock_dq_uninit(&ji_gh);
gfs2_lm_recovery_done(sdp, jd->jd_jid, LM_RD_SUCCESS);
gfs2_recovery_done(sdp, jd->jd_jid, LM_RD_SUCCESS);
if (jd->jd_jid != sdp->sd_lockstruct.ls_jid)
gfs2_glock_dq_uninit(&j_gh);
@ -581,7 +583,7 @@ fail_gunlock_j:
fs_info(sdp, "jid=%u: %s\n", jd->jd_jid, (error) ? "Failed" : "Done");
fail:
gfs2_lm_recovery_done(sdp, jd->jd_jid, LM_RD_GAVEUP);
gfs2_recovery_done(sdp, jd->jd_jid, LM_RD_GAVEUP);
return error;
}

1
fs/gfs2/rgrp.c
View File

@ -13,7 +13,6 @@
#include <linux/buffer_head.h>
#include <linux/fs.h>
#include <linux/gfs2_ondisk.h>
#include <linux/lm_interface.h>
#include <linux/prefetch.h>
#include "gfs2.h"

1
fs/gfs2/super.c
View File

@ -15,7 +15,6 @@
#include <linux/crc32.h>
#include <linux/gfs2_ondisk.h>
#include <linux/bio.h>
#include <linux/lm_interface.h>
#include "gfs2.h"
#include "incore.h"

154
fs/gfs2/sys.c
View File

@ -14,9 +14,8 @@
#include <linux/buffer_head.h>
#include <linux/module.h>
#include <linux/kobject.h>
#include <linux/gfs2_ondisk.h>
#include <linux/lm_interface.h>
#include <asm/uaccess.h>
#include <linux/gfs2_ondisk.h>
#include "gfs2.h"
#include "incore.h"
@ -224,14 +223,145 @@ static struct lockstruct_attr lockstruct_attr_##name = __ATTR_RO(name)
LOCKSTRUCT_ATTR(jid, "%u\n");
LOCKSTRUCT_ATTR(first, "%u\n");
LOCKSTRUCT_ATTR(lvb_size, "%u\n");
LOCKSTRUCT_ATTR(flags, "%d\n");
static struct attribute *lockstruct_attrs[] = {
&lockstruct_attr_jid.attr,
&lockstruct_attr_first.attr,
&lockstruct_attr_lvb_size.attr,
&lockstruct_attr_flags.attr,
NULL,
};
/*
* lock_module. Originally from lock_dlm
*/
static ssize_t proto_name_show(struct gfs2_sbd *sdp, char *buf)
{
const struct lm_lockops *ops = sdp->sd_lockstruct.ls_ops;
return sprintf(buf, "%s\n", ops->lm_proto_name);
}
static ssize_t block_show(struct gfs2_sbd *sdp, char *buf)
{
struct lm_lockstruct *ls = &sdp->sd_lockstruct;
ssize_t ret;
int val = 0;
if (test_bit(DFL_BLOCK_LOCKS, &ls->ls_flags))
val = 1;
ret = sprintf(buf, "%d\n", val);
return ret;
}
static ssize_t block_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
{
struct lm_lockstruct *ls = &sdp->sd_lockstruct;
ssize_t ret = len;
int val;
val = simple_strtol(buf, NULL, 0);
if (val == 1)
set_bit(DFL_BLOCK_LOCKS, &ls->ls_flags);
else if (val == 0) {
clear_bit(DFL_BLOCK_LOCKS, &ls->ls_flags);
smp_mb__after_clear_bit();
gfs2_glock_thaw(sdp);
} else {
ret = -EINVAL;
}
return ret;
}
static ssize_t lkid_show(struct gfs2_sbd *sdp, char *buf)
{
struct lm_lockstruct *ls = &sdp->sd_lockstruct;
return sprintf(buf, "%u\n", ls->ls_id);
}
static ssize_t lkfirst_show(struct gfs2_sbd *sdp, char *buf)
{
struct lm_lockstruct *ls = &sdp->sd_lockstruct;
return sprintf(buf, "%d\n", ls->ls_first);
}
static ssize_t first_done_show(struct gfs2_sbd *sdp, char *buf)
{
struct lm_lockstruct *ls = &sdp->sd_lockstruct;
return sprintf(buf, "%d\n", ls->ls_first_done);
}
static ssize_t recover_show(struct gfs2_sbd *sdp, char *buf)
{
struct lm_lockstruct *ls = &sdp->sd_lockstruct;
return sprintf(buf, "%d\n", ls->ls_recover_jid);
}
static void gfs2_jdesc_make_dirty(struct gfs2_sbd *sdp, unsigned int jid)
{
struct gfs2_jdesc *jd;
spin_lock(&sdp->sd_jindex_spin);
list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
if (jd->jd_jid != jid)
continue;
jd->jd_dirty = 1;
break;
}
spin_unlock(&sdp->sd_jindex_spin);
}
static ssize_t recover_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
{
struct lm_lockstruct *ls = &sdp->sd_lockstruct;
ls->ls_recover_jid = simple_strtol(buf, NULL, 0);
gfs2_jdesc_make_dirty(sdp, ls->ls_recover_jid);
if (sdp->sd_recoverd_process)
wake_up_process(sdp->sd_recoverd_process);
return len;
}
static ssize_t recover_done_show(struct gfs2_sbd *sdp, char *buf)
{
struct lm_lockstruct *ls = &sdp->sd_lockstruct;
return sprintf(buf, "%d\n", ls->ls_recover_jid_done);
}
static ssize_t recover_status_show(struct gfs2_sbd *sdp, char *buf)
{
struct lm_lockstruct *ls = &sdp->sd_lockstruct;
return sprintf(buf, "%d\n", ls->ls_recover_jid_status);
}
struct gdlm_attr {
struct attribute attr;
ssize_t (*show)(struct gfs2_sbd *sdp, char *);
ssize_t (*store)(struct gfs2_sbd *sdp, const char *, size_t);
};
#define GDLM_ATTR(_name,_mode,_show,_store) \
static struct gdlm_attr gdlm_attr_##_name = __ATTR(_name,_mode,_show,_store)
GDLM_ATTR(proto_name, 0444, proto_name_show, NULL);
GDLM_ATTR(block, 0644, block_show, block_store);
GDLM_ATTR(withdraw, 0644, withdraw_show, withdraw_store);
GDLM_ATTR(id, 0444, lkid_show, NULL);
GDLM_ATTR(first, 0444, lkfirst_show, NULL);
GDLM_ATTR(first_done, 0444, first_done_show, NULL);
GDLM_ATTR(recover, 0644, recover_show, recover_store);
GDLM_ATTR(recover_done, 0444, recover_done_show, NULL);
GDLM_ATTR(recover_status, 0444, recover_status_show, NULL);
static struct attribute *lock_module_attrs[] = {
&gdlm_attr_proto_name.attr,
&gdlm_attr_block.attr,
&gdlm_attr_withdraw.attr,
&gdlm_attr_id.attr,
&lockstruct_attr_jid.attr,
&gdlm_attr_first.attr,
&gdlm_attr_first_done.attr,
&gdlm_attr_recover.attr,
&gdlm_attr_recover_done.attr,
&gdlm_attr_recover_status.attr,
NULL,
};
@ -412,6 +542,11 @@ static struct attribute_group tune_group = {
.attrs = tune_attrs,
};
static struct attribute_group lock_module_group = {
.name = "lock_module",
.attrs = lock_module_attrs,
};
int gfs2_sys_fs_add(struct gfs2_sbd *sdp)
{
int error;
@ -434,9 +569,15 @@ int gfs2_sys_fs_add(struct gfs2_sbd *sdp)
if (error)
goto fail_args;
error = sysfs_create_group(&sdp->sd_kobj, &lock_module_group);
if (error)
goto fail_tune;
kobject_uevent(&sdp->sd_kobj, KOBJ_ADD);
return 0;
fail_tune:
sysfs_remove_group(&sdp->sd_kobj, &tune_group);
fail_args:
sysfs_remove_group(&sdp->sd_kobj, &args_group);
fail_lockstruct:
@ -453,6 +594,7 @@ void gfs2_sys_fs_del(struct gfs2_sbd *sdp)
sysfs_remove_group(&sdp->sd_kobj, &tune_group);
sysfs_remove_group(&sdp->sd_kobj, &args_group);
sysfs_remove_group(&sdp->sd_kobj, &lockstruct_group);
sysfs_remove_group(&sdp->sd_kobj, &lock_module_group);
kobject_put(&sdp->sd_kobj);
}

3
fs/gfs2/trans.c
View File

@ -12,9 +12,8 @@
#include <linux/spinlock.h>
#include <linux/completion.h>
#include <linux/buffer_head.h>
#include <linux/gfs2_ondisk.h>
#include <linux/kallsyms.h>
#include <linux/lm_interface.h>
#include <linux/gfs2_ondisk.h>
#include "gfs2.h"
#include "incore.h"

11
fs/gfs2/util.c
View File

@ -13,7 +13,6 @@
#include <linux/buffer_head.h>
#include <linux/crc32.h>
#include <linux/gfs2_ondisk.h>
#include <linux/lm_interface.h>
#include <asm/uaccess.h>
#include "gfs2.h"
@ -35,6 +34,8 @@ void gfs2_assert_i(struct gfs2_sbd *sdp)
int gfs2_lm_withdraw(struct gfs2_sbd *sdp, char *fmt, ...)
{
struct lm_lockstruct *ls = &sdp->sd_lockstruct;
const struct lm_lockops *lm = ls->ls_ops;
va_list args;
if (test_and_set_bit(SDF_SHUTDOWN, &sdp->sd_flags))
@ -47,8 +48,12 @@ int gfs2_lm_withdraw(struct gfs2_sbd *sdp, char *fmt, ...)
fs_err(sdp, "about to withdraw this file system\n");
BUG_ON(sdp->sd_args.ar_debug);
fs_err(sdp, "telling LM to withdraw\n");
gfs2_withdraw_lockproto(&sdp->sd_lockstruct);
kobject_uevent(&sdp->sd_kobj, KOBJ_OFFLINE);
if (lm->lm_unmount) {
fs_err(sdp, "telling LM to unmount\n");
lm->lm_unmount(sdp);
}
fs_err(sdp, "withdrawn\n");
dump_stack();

277
include/linux/lm_interface.h
View File

@ -1,277 +0,0 @@
/*
* 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 version 2.
*/
#ifndef __LM_INTERFACE_DOT_H__
#define __LM_INTERFACE_DOT_H__
typedef void (*lm_callback_t) (void *ptr, unsigned int type, void *data);
/*
* lm_mount() flags
*
* LM_MFLAG_SPECTATOR
* GFS is asking to join the filesystem's lockspace, but it doesn't want to
* modify the filesystem. The lock module shouldn't assign a journal to the FS
* mount. It shouldn't send recovery callbacks to the FS mount. If the node
* dies or withdraws, all locks can be wiped immediately.
*
* LM_MFLAG_CONV_NODROP
* Do not allow the dlm to internally resolve conversion deadlocks by demoting
* the lock to unlocked and then reacquiring it in the requested mode. Instead,
* it should cancel the request and return LM_OUT_CONV_DEADLK.
*/
#define LM_MFLAG_SPECTATOR 0x00000001
#define LM_MFLAG_CONV_NODROP 0x00000002
/*
* lm_lockstruct flags
*
* LM_LSFLAG_LOCAL
* The lock_nolock module returns LM_LSFLAG_LOCAL to GFS, indicating that GFS
* can make single-node optimizations.
*/
#define LM_LSFLAG_LOCAL 0x00000001
/*
* lm_lockname types
*/
#define LM_TYPE_RESERVED 0x00
#define LM_TYPE_NONDISK 0x01
#define LM_TYPE_INODE 0x02
#define LM_TYPE_RGRP 0x03
#define LM_TYPE_META 0x04
#define LM_TYPE_IOPEN 0x05
#define LM_TYPE_FLOCK 0x06
#define LM_TYPE_PLOCK 0x07
#define LM_TYPE_QUOTA 0x08
#define LM_TYPE_JOURNAL 0x09
/*
* lm_lock() states
*
* SHARED is compatible with SHARED, not with DEFERRED or EX.
* DEFERRED is compatible with DEFERRED, not with SHARED or EX.
*/
#define LM_ST_UNLOCKED 0
#define LM_ST_EXCLUSIVE 1
#define LM_ST_DEFERRED 2
#define LM_ST_SHARED 3
/*
* lm_lock() flags
*
* LM_FLAG_TRY
* Don't wait to acquire the lock if it can't be granted immediately.
*
* LM_FLAG_TRY_1CB
* Send one blocking callback if TRY is set and the lock is not granted.
*
* LM_FLAG_NOEXP
* GFS sets this flag on lock requests it makes while doing journal recovery.
* These special requests should not be blocked due to the recovery like
* ordinary locks would be.
*
* LM_FLAG_ANY
* A SHARED request may also be granted in DEFERRED, or a DEFERRED request may
* also be granted in SHARED. The preferred state is whichever is compatible
* with other granted locks, or the specified state if no other locks exist.
*
* LM_FLAG_PRIORITY
* Override fairness considerations. Suppose a lock is held in a shared state
* and there is a pending request for the deferred state. A shared lock
* request with the priority flag would be allowed to bypass the deferred
* request and directly join the other shared lock. A shared lock request
* without the priority flag might be forced to wait until the deferred
* requested had acquired and released the lock.
*/
#define LM_FLAG_TRY 0x00000001
#define LM_FLAG_TRY_1CB 0x00000002
#define LM_FLAG_NOEXP 0x00000004
#define LM_FLAG_ANY 0x00000008
#define LM_FLAG_PRIORITY 0x00000010
/*
* lm_lock() and lm_async_cb return flags
*
* LM_OUT_ST_MASK
* Masks the lower two bits of lock state in the returned value.
*
* LM_OUT_CACHEABLE
* The lock hasn't been released so GFS can continue to cache data for it.
*
* LM_OUT_CANCELED
* The lock request was canceled.
*
* LM_OUT_ASYNC
* The result of the request will be returned in an LM_CB_ASYNC callback.
*
* LM_OUT_CONV_DEADLK
* The lock request was canceled do to a conversion deadlock.
*/
#define LM_OUT_ST_MASK 0x00000003
#define LM_OUT_CANCELED 0x00000008
#define LM_OUT_ASYNC 0x00000080
#define LM_OUT_ERROR 0x00000100
/*
* lm_callback_t types
*
* LM_CB_NEED_E LM_CB_NEED_D LM_CB_NEED_S
* Blocking callback, a remote node is requesting the given lock in
* EXCLUSIVE, DEFERRED, or SHARED.
*
* LM_CB_NEED_RECOVERY
* The given journal needs to be recovered.
*
* LM_CB_ASYNC
* The given lock has been granted.
*/
#define LM_CB_NEED_E 257
#define LM_CB_NEED_D 258
#define LM_CB_NEED_S 259
#define LM_CB_NEED_RECOVERY 260
#define LM_CB_ASYNC 262
/*
* lm_recovery_done() messages
*/
#define LM_RD_GAVEUP 308
#define LM_RD_SUCCESS 309
struct lm_lockname {
u64 ln_number;
unsigned int ln_type;
};
#define lm_name_equal(name1, name2) \
(((name1)->ln_number == (name2)->ln_number) && \
((name1)->ln_type == (name2)->ln_type)) \
struct lm_async_cb {
struct lm_lockname lc_name;
int lc_ret;
};
struct lm_lockstruct;
struct lm_lockops {
const char *lm_proto_name;
/*
* Mount/Unmount
*/
int (*lm_mount) (char *table_name, char *host_data,
lm_callback_t cb, void *cb_data,
unsigned int min_lvb_size, int flags,
struct lm_lockstruct *lockstruct,
struct kobject *fskobj);
void (*lm_others_may_mount) (void *lockspace);
void (*lm_unmount) (void *lockspace);
void (*lm_withdraw) (void *lockspace);
/*
* Lock oriented operations
*/
int (*lm_get_lock) (void *lockspace, struct lm_lockname *name, void **lockp);
void (*lm_put_lock) (void *lock);
unsigned int (*lm_lock) (void *lock, unsigned int cur_state,
unsigned int req_state, unsigned int flags);
unsigned int (*lm_unlock) (void *lock, unsigned int cur_state);
void (*lm_cancel) (void *lock);
int (*lm_hold_lvb) (void *lock, char **lvbp);
void (*lm_unhold_lvb) (void *lock, char *lvb);
/*
* Posix Lock oriented operations
*/
int (*lm_plock_get) (void *lockspace, struct lm_lockname *name,
struct file *file, struct file_lock *fl);
int (*lm_plock) (void *lockspace, struct lm_lockname *name,
struct file *file, int cmd, struct file_lock *fl);
int (*lm_punlock) (void *lockspace, struct lm_lockname *name,
struct file *file, struct file_lock *fl);
/*
* Client oriented operations
*/
void (*lm_recovery_done) (void *lockspace, unsigned int jid,
unsigned int message);
struct module *lm_owner;
};
/*
* lm_mount() return values
*
* ls_jid - the journal ID this node should use
* ls_first - this node is the first to mount the file system
* ls_lvb_size - size in bytes of lock value blocks
* ls_lockspace - lock module's context for this file system
* ls_ops - lock module's functions
* ls_flags - lock module features
*/
struct lm_lockstruct {
unsigned int ls_jid;
unsigned int ls_first;
unsigned int ls_lvb_size;
void *ls_lockspace;
const struct lm_lockops *ls_ops;
int ls_flags;
};
/*
* Lock module bottom interface. A lock module makes itself available to GFS
* with these functions.
*/
int gfs2_register_lockproto(const struct lm_lockops *proto);
void gfs2_unregister_lockproto(const struct lm_lockops *proto);
/*
* Lock module top interface. GFS calls these functions when mounting or
* unmounting a file system.
*/
int gfs2_mount_lockproto(char *proto_name, char *table_name, char *host_data,
lm_callback_t cb, void *cb_data,
unsigned int min_lvb_size, int flags,
struct lm_lockstruct *lockstruct,
struct kobject *fskobj);
void gfs2_unmount_lockproto(struct lm_lockstruct *lockstruct);
void gfs2_withdraw_lockproto(struct lm_lockstruct *lockstruct);
#endif /* __LM_INTERFACE_DOT_H__ */