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-   -   Merge the lock_dlm module into GFS2 (http://www.linux-archive.org/cluster-development/203254-merge-lock_dlm-module-into-gfs2.html)

Steven Whitehouse 12-01-2008 02:12 PM

Merge the lock_dlm module into GFS2
 
Hi,

So this is a pretty large patch... my current plan is to be ready
to push this into the next -nmw tree (i.e. first patch after the
next merge window), but we'll see if it makes it in time.

The reason for posting this now when its not yet in
its final form is to give a heads up at whats coming up.
Please let me know if you've got any comments about it so
far.

There will, no doubt, be a few more changes required after some
further testing, but even in its current (alpha) form it is
possible to mount, use & umount a filesystem. If you do test
this though, you may have to chop out the line in the cman
initscript which tries to load lock_dlm.

Steve.

----------------------------------------------------------------------
>From 351b4a4b2bebe7636eb01c524c5e1d6ff8bcd4b5 Mon Sep 17 00:00:00 2001
From: Steven Whitehouse <swhiteho@redhat.com>
Date: Mon, 1 Dec 2008 14:06:57 +0000
Subject: [PATCH] [GFS2] Merge the lock_dlm module into GFS2

Before I go any further, to avoid any posible confusion, let
me say that this is not merging the DLM into GFS2, but only
the previously separate interface module.

This is a large patch, but most of it is deleting code, and
of the remainder, a lot of it is just moving code from one
place to another. In order to allow the building of GFS2 for
single node use with not dependencies on the DLM or networking,
etc, the previous config option for lock_dlm is turned into
a boolean.

The main reasons for doing this change, are to reduce duplication
between the lock module and GFS2 (glocks contain much of the
information which lock_nolock used to keep on its own behalf
before) and to make the code simpler and faster. Since we
now use the glock pointer as the reference which we pass to
the DLM, that removes not one, but _two_ lookups for each
reply we receive from the DLM.

Although the glock has grown slightly in size, its much smaller
then the previous combined glock and struct gdlm_lock were, and
only one allocation is required, rather than two. There are some
further optimisations which could be done in the future in regards
to the generation of the lock name which is passed to the DLM.

In addition, a couple of bugs are fixed. Firstly the string name
of the lock was too short, causing the NULL to be written into
the following field of the structure. That never mattered since
that field was the "length" of the string which was initialised
after the string name. Following that point, the string was only
ever used as a fixed size array of bytes, so that the missing NULL
didn't matter. That bug is fixed in this patch.

Also we add a dependancy on HOTPLUG since we require this in order
to send the uevents with which we communication with gfs_controld.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

diff --git a/fs/gfs2/Kconfig b/fs/gfs2/Kconfig
index ab2f57e..5bf4703 100644
--- a/fs/gfs2/Kconfig
+++ b/fs/gfs2/Kconfig
@@ -1,6 +1,10 @@
config GFS2_FS
tristate "GFS2 file system support"
depends on EXPERIMENTAL && (64BIT || (LSF && 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.
diff --git a/fs/gfs2/Makefile b/fs/gfs2/Makefile
index c1b4ec6..a851ea4 100644
--- a/fs/gfs2/Makefile
+++ b/fs/gfs2/Makefile
@@ -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

diff --git a/fs/gfs2/acl.c b/fs/gfs2/acl.c
index e335dce..43764f4 100644
--- a/fs/gfs2/acl.c
+++ b/fs/gfs2/acl.c
@@ -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"
diff --git a/fs/gfs2/bmap.c b/fs/gfs2/bmap.c
index 789f28c..402ef81 100644
--- a/fs/gfs2/bmap.c
+++ b/fs/gfs2/bmap.c
@@ -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"
diff --git a/fs/gfs2/dir.c b/fs/gfs2/dir.c
index b7c8e5c..aef4d0c 100644
--- a/fs/gfs2/dir.c
+++ b/fs/gfs2/dir.c
@@ -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"
diff --git a/fs/gfs2/eaops.c b/fs/gfs2/eaops.c
index f114ba2..dee9b03 100644
--- a/fs/gfs2/eaops.c
+++ b/fs/gfs2/eaops.c
@@ -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"
diff --git a/fs/gfs2/eattr.c b/fs/gfs2/eattr.c
index 0d1c76d..899763a 100644
--- a/fs/gfs2/eattr.c
+++ b/fs/gfs2/eattr.c
@@ -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"
diff --git a/fs/gfs2/glock.c b/fs/gfs2/glock.c
index 5eae62e..69aae96 100644
--- a/fs/gfs2/glock.c
+++ b/fs/gfs2/glock.c
@@ -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);
@@ -256,27 +250,6 @@ static struct gfs2_glock *search_bucket(unsigned int hash,
}

/**
- * 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
* @gh: The lock request which we wish to grant
@@ -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)
-{
- 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)
+void gfs2_glock_cb(struct gfs2_glock *gl, 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 +1378,26 @@ 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);
+ 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
@@ -1540,6 +1423,20 @@ static void clear_glock(struct gfs2_glock *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
* @wait: wait until it's all gone
@@ -1620,7 +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)
@@ -1684,6 +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;
}
@@ -1718,14 +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
",
+ gfs2_print_dbg(seq, "G: s:%s n:%u/%llu f:%s t:%s d:%s/%llu a:%d r:%d
",
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));

diff --git a/fs/gfs2/glock.h b/fs/gfs2/glock.h
index ce54f33..df77082 100644
--- a/fs/gfs2/glock.h
+++ b/fs/gfs2/glock.h
@@ -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 super_block *sb);
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__ */
diff --git a/fs/gfs2/glops.c b/fs/gfs2/glops.c
index 8522d3a..f07ede8 100644
--- a/fs/gfs2/glops.c
+++ b/fs/gfs2/glops.c
@@ -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,
};

diff --git a/fs/gfs2/incore.h b/fs/gfs2/incore.h
index 608849d..52f1ef3 100644
--- a/fs/gfs2/incore.h
+++ b/fs/gfs2/incore.h
@@ -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 +124,30 @@ 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,
+ DFL_SPECTATOR = 1,
+ DFL_WITHDRAW = 2,
+};
+
+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 +189,8 @@ enum {
GLF_LFLUSH = 7,
GLF_INVALIDATE_IN_PROGRESS = 8,
GLF_REPLY_PENDING = 9,
+ GLF_INITIAL = 10,
+ GLF_FROZEN = 11,
};

struct gfs2_glock {
@@ -181,10 +210,9 @@ 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 +475,30 @@ 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 +572,6 @@ 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;
diff --git a/fs/gfs2/inode.c b/fs/gfs2/inode.c
index 606bf44..f2530ea 100644
--- a/fs/gfs2/inode.c
+++ b/fs/gfs2/inode.c
@@ -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 {
diff --git a/fs/gfs2/inode.h b/fs/gfs2/inode.h
index d532936..dca4fee 100644
--- a/fs/gfs2/inode.h
+++ b/fs/gfs2/inode.h
@@ -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__ */

diff --git a/fs/gfs2/lock_dlm.c b/fs/gfs2/lock_dlm.c
new file mode 100644
index 0000000..1ea9cd5
--- /dev/null
+++ b/fs/gfs2/lock_dlm.c
@@ -0,0 +1,239 @@
+/*
+ * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
+ * Copyright (C) 2004-2008 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
",
+ 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
");
+ 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,
+};
+
diff --git a/fs/gfs2/locking.c b/fs/gfs2/locking.c
deleted file mode 100644
index 523243a..0000000
--- a/fs/gfs2/locking.c
+++ /dev/null
@@ -1,232 +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;
-};
-
-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);
-
-/* 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,
-};
-
-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;
-
- c = strstr(host_data, "jid=");
- if (!c)
- jid = 0;
- else {
- c += 4;
- sscanf(c, "%u", &jid);
- }
-
- lockstruct->ls_jid = jid;
- lockstruct->ls_first = 1;
- lockstruct->ls_lvb_size = min_lvb_size;
- lockstruct->ls_ops = &nolock_ops;
- lockstruct->ls_flags = LM_LSFLAG_LOCAL;
-
- return 0;
-}
-
-/**
- * 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
",
- 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
",
- 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
", 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);
-
diff --git a/fs/gfs2/locking/dlm/Makefile b/fs/gfs2/locking/dlm/Makefile
deleted file mode 100644
index 2609bb6..0000000
--- a/fs/gfs2/locking/dlm/Makefile
+++ /dev/null
@@ -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
-
diff --git a/fs/gfs2/locking/dlm/lock.c b/fs/gfs2/locking/dlm/lock.c
deleted file mode 100644
index 2482c90..0000000
--- a/fs/gfs2/locking/dlm/lock.c
+++ /dev/null
@@ -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
",
- 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
");
- 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
",
- 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);
-}
-
diff --git a/fs/gfs2/locking/dlm/lock_dlm.h b/fs/gfs2/locking/dlm/lock_dlm.h
deleted file mode 100644
index 3c98e7c..0000000
--- a/fs/gfs2/locking/dlm/lock_dlm.h
+++ /dev/null
@@ -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"
"
- "lock_dlm: " fmt "
",
- #assertion, ##args);
- BUG();
- }
-} while (0)
-
-#define log_print(lev, fmt, arg...) printk(lev "lock_dlm: " fmt "
" , ## 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
-
diff --git a/fs/gfs2/locking/dlm/main.c b/fs/gfs2/locking/dlm/main.c
deleted file mode 100644
index b9a03a7..0000000
--- a/fs/gfs2/locking/dlm/main.c
+++ /dev/null
@@ -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
",
- 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
", __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");
-
diff --git a/fs/gfs2/locking/dlm/mount.c b/fs/gfs2/locking/dlm/mount.c
deleted file mode 100644
index 1aa7eb6..0000000
--- a/fs/gfs2/locking/dlm/mount.c
+++ /dev/null
@@ -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] = '';
-
- p = strchr(buf, ':');
- if (!p) {
- log_info("invalid table_name "%s"", table_name);
- kfree(ls);
- return NULL;
- }
- *p = '';
- 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


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