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-rw-r--r--fs/gfs2/locking/dlm/lock.c368
-rw-r--r--fs/gfs2/locking/dlm/lock_dlm.h18
-rw-r--r--fs/gfs2/locking/dlm/mount.c14
-rw-r--r--fs/gfs2/locking/dlm/sysfs.c13
-rw-r--r--fs/gfs2/locking/dlm/thread.c331
-rw-r--r--fs/gfs2/locking/nolock/Makefile3
-rw-r--r--fs/gfs2/locking/nolock/main.c238
7 files changed, 288 insertions, 697 deletions
diff --git a/fs/gfs2/locking/dlm/lock.c b/fs/gfs2/locking/dlm/lock.c
index cf7ea8abec8..2482c904750 100644
--- a/fs/gfs2/locking/dlm/lock.c
+++ b/fs/gfs2/locking/dlm/lock.c
@@ -11,46 +11,60 @@
static char junk_lvb[GDLM_LVB_SIZE];
-static void queue_complete(struct gdlm_lock *lp)
+
+/* convert dlm lock-mode to gfs lock-state */
+
+static s16 gdlm_make_lmstate(s16 dlmmode)
{
- struct gdlm_ls *ls = lp->ls;
+ 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;
+}
- clear_bit(LFL_ACTIVE, &lp->flags);
+/* 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->clist, &ls->complete);
+ list_add_tail(&lp->delay_list, &ls->submit);
spin_unlock(&ls->async_lock);
wake_up(&ls->thread_wait);
}
-static inline void gdlm_ast(void *astarg)
+static void wake_up_ast(struct gdlm_lock *lp)
{
- queue_complete(astarg);
+ clear_bit(LFL_AST_WAIT, &lp->flags);
+ smp_mb__after_clear_bit();
+ wake_up_bit(&lp->flags, LFL_AST_WAIT);
}
-static inline void gdlm_bast(void *astarg, int mode)
+static void gdlm_delete_lp(struct gdlm_lock *lp)
{
- struct gdlm_lock *lp = astarg;
struct gdlm_ls *ls = lp->ls;
- 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;
- }
-
spin_lock(&ls->async_lock);
- if (!lp->bast_mode) {
- list_add_tail(&lp->blist, &ls->blocking);
- lp->bast_mode = mode;
- } else if (lp->bast_mode < mode)
- lp->bast_mode = mode;
+ if (!list_empty(&lp->delay_list))
+ list_del_init(&lp->delay_list);
+ ls->all_locks_count--;
spin_unlock(&ls->async_lock);
- wake_up(&ls->thread_wait);
+
+ kfree(lp);
}
-void gdlm_queue_delayed(struct gdlm_lock *lp)
+static void gdlm_queue_delayed(struct gdlm_lock *lp)
{
struct gdlm_ls *ls = lp->ls;
@@ -59,6 +73,236 @@ void gdlm_queue_delayed(struct gdlm_lock *lp)
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)
@@ -77,24 +321,6 @@ static s16 make_mode(s16 lmstate)
return -1;
}
-/* convert dlm lock-mode to gfs lock-state */
-
-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;
-}
/* 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. */
@@ -134,14 +360,6 @@ static inline unsigned int make_flags(struct gdlm_lock *lp,
if (lp->lksb.sb_lkid != 0) {
lkf |= DLM_LKF_CONVERT;
-
- /* Conversion deadlock avoidance by DLM */
-
- if (!(lp->ls->fsflags & LM_MFLAG_CONV_NODROP) &&
- !test_bit(LFL_FORCE_PROMOTE, &lp->flags) &&
- !(lkf & DLM_LKF_NOQUEUE) &&
- cur > DLM_LOCK_NL && req > DLM_LOCK_NL && cur != req)
- lkf |= DLM_LKF_CONVDEADLK;
}
if (lp->lvb)
@@ -173,14 +391,9 @@ static int gdlm_create_lp(struct gdlm_ls *ls, struct lm_lockname *name,
make_strname(name, &lp->strname);
lp->ls = ls;
lp->cur = DLM_LOCK_IV;
- lp->lvb = NULL;
- lp->hold_null = NULL;
- INIT_LIST_HEAD(&lp->clist);
- INIT_LIST_HEAD(&lp->blist);
INIT_LIST_HEAD(&lp->delay_list);
spin_lock(&ls->async_lock);
- list_add(&lp->all_list, &ls->all_locks);
ls->all_locks_count++;
spin_unlock(&ls->async_lock);
@@ -188,26 +401,6 @@ static int gdlm_create_lp(struct gdlm_ls *ls, struct lm_lockname *name,
return 0;
}
-void gdlm_delete_lp(struct gdlm_lock *lp)
-{
- struct gdlm_ls *ls = lp->ls;
-
- spin_lock(&ls->async_lock);
- if (!list_empty(&lp->clist))
- list_del_init(&lp->clist);
- if (!list_empty(&lp->blist))
- list_del_init(&lp->blist);
- if (!list_empty(&lp->delay_list))
- list_del_init(&lp->delay_list);
- gdlm_assert(!list_empty(&lp->all_list), "%x,%llx", lp->lockname.ln_type,
- (unsigned long long)lp->lockname.ln_number);
- list_del_init(&lp->all_list);
- ls->all_locks_count--;
- spin_unlock(&ls->async_lock);
-
- kfree(lp);
-}
-
int gdlm_get_lock(void *lockspace, struct lm_lockname *name,
void **lockp)
{
@@ -261,7 +454,7 @@ unsigned int gdlm_do_lock(struct gdlm_lock *lp)
if ((error == -EAGAIN) && (lp->lkf & DLM_LKF_NOQUEUE)) {
lp->lksb.sb_status = -EAGAIN;
- queue_complete(lp);
+ gdlm_ast(lp);
error = 0;
}
@@ -308,6 +501,12 @@ unsigned int gdlm_lock(void *lock, unsigned int cur_state,
{
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);
@@ -351,7 +550,7 @@ void gdlm_cancel(void *lock)
if (delay_list) {
set_bit(LFL_CANCEL, &lp->flags);
set_bit(LFL_ACTIVE, &lp->flags);
- queue_complete(lp);
+ gdlm_ast(lp);
return;
}
@@ -507,22 +706,3 @@ void gdlm_submit_delayed(struct gdlm_ls *ls)
wake_up(&ls->thread_wait);
}
-int gdlm_release_all_locks(struct gdlm_ls *ls)
-{
- struct gdlm_lock *lp, *safe;
- int count = 0;
-
- spin_lock(&ls->async_lock);
- list_for_each_entry_safe(lp, safe, &ls->all_locks, all_list) {
- list_del_init(&lp->all_list);
-
- if (lp->lvb && lp->lvb != junk_lvb)
- kfree(lp->lvb);
- kfree(lp);
- count++;
- }
- spin_unlock(&ls->async_lock);
-
- return count;
-}
-
diff --git a/fs/gfs2/locking/dlm/lock_dlm.h b/fs/gfs2/locking/dlm/lock_dlm.h
index a243cf69c54..3c98e7c6f93 100644
--- a/fs/gfs2/locking/dlm/lock_dlm.h
+++ b/fs/gfs2/locking/dlm/lock_dlm.h
@@ -72,19 +72,12 @@ struct gdlm_ls {
int recover_jid_done;
int recover_jid_status;
spinlock_t async_lock;
- struct list_head complete;
- struct list_head blocking;
struct list_head delayed;
struct list_head submit;
- struct list_head all_locks;
u32 all_locks_count;
wait_queue_head_t wait_control;
- struct task_struct *thread1;
- struct task_struct *thread2;
+ struct task_struct *thread;
wait_queue_head_t thread_wait;
- unsigned long drop_time;
- int drop_locks_count;
- int drop_locks_period;
};
enum {
@@ -117,12 +110,7 @@ struct gdlm_lock {
u32 lkf; /* dlm flags DLM_LKF_ */
unsigned long flags; /* lock_dlm flags LFL_ */
- int bast_mode; /* protected by async_lock */
-
- struct list_head clist; /* complete */
- struct list_head blist; /* blocking */
struct list_head delay_list; /* delayed */
- struct list_head all_list; /* all locks for the fs */
struct gdlm_lock *hold_null; /* NL lock for hold_lvb */
};
@@ -159,11 +147,7 @@ void gdlm_release_threads(struct gdlm_ls *);
/* lock.c */
-s16 gdlm_make_lmstate(s16);
-void gdlm_queue_delayed(struct gdlm_lock *);
void gdlm_submit_delayed(struct gdlm_ls *);
-int gdlm_release_all_locks(struct gdlm_ls *);
-void gdlm_delete_lp(struct gdlm_lock *);
unsigned int gdlm_do_lock(struct gdlm_lock *);
int gdlm_get_lock(void *, struct lm_lockname *, void **);
diff --git a/fs/gfs2/locking/dlm/mount.c b/fs/gfs2/locking/dlm/mount.c
index 470bdf650b5..09d78c216f4 100644
--- a/fs/gfs2/locking/dlm/mount.c
+++ b/fs/gfs2/locking/dlm/mount.c
@@ -22,22 +22,14 @@ static struct gdlm_ls *init_gdlm(lm_callback_t cb, struct gfs2_sbd *sdp,
if (!ls)
return NULL;
- ls->drop_locks_count = GDLM_DROP_COUNT;
- ls->drop_locks_period = GDLM_DROP_PERIOD;
ls->fscb = cb;
ls->sdp = sdp;
ls->fsflags = flags;
spin_lock_init(&ls->async_lock);
- INIT_LIST_HEAD(&ls->complete);
- INIT_LIST_HEAD(&ls->blocking);
INIT_LIST_HEAD(&ls->delayed);
INIT_LIST_HEAD(&ls->submit);
- INIT_LIST_HEAD(&ls->all_locks);
init_waitqueue_head(&ls->thread_wait);
init_waitqueue_head(&ls->wait_control);
- ls->thread1 = NULL;
- ls->thread2 = NULL;
- ls->drop_time = jiffies;
ls->jid = -1;
strncpy(buf, table_name, 256);
@@ -180,7 +172,6 @@ out:
static void gdlm_unmount(void *lockspace)
{
struct gdlm_ls *ls = lockspace;
- int rv;
log_debug("unmount flags %lx", ls->flags);
@@ -194,9 +185,7 @@ static void gdlm_unmount(void *lockspace)
gdlm_kobject_release(ls);
dlm_release_lockspace(ls->dlm_lockspace, 2);
gdlm_release_threads(ls);
- rv = gdlm_release_all_locks(ls);
- if (rv)
- log_info("gdlm_unmount: %d stray locks freed", rv);
+ BUG_ON(ls->all_locks_count);
out:
kfree(ls);
}
@@ -232,7 +221,6 @@ static void gdlm_withdraw(void *lockspace)
dlm_release_lockspace(ls->dlm_lockspace, 2);
gdlm_release_threads(ls);
- gdlm_release_all_locks(ls);
gdlm_kobject_release(ls);
}
diff --git a/fs/gfs2/locking/dlm/sysfs.c b/fs/gfs2/locking/dlm/sysfs.c
index a4ff271df9e..4ec571c3d8a 100644
--- a/fs/gfs2/locking/dlm/sysfs.c
+++ b/fs/gfs2/locking/dlm/sysfs.c
@@ -114,17 +114,6 @@ static ssize_t recover_status_show(struct gdlm_ls *ls, char *buf)
return sprintf(buf, "%d\n", ls->recover_jid_status);
}
-static ssize_t drop_count_show(struct gdlm_ls *ls, char *buf)
-{
- return sprintf(buf, "%d\n", ls->drop_locks_count);
-}
-
-static ssize_t drop_count_store(struct gdlm_ls *ls, const char *buf, size_t len)
-{
- ls->drop_locks_count = simple_strtol(buf, NULL, 0);
- return len;
-}
-
struct gdlm_attr {
struct attribute attr;
ssize_t (*show)(struct gdlm_ls *, char *);
@@ -144,7 +133,6 @@ 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);
-GDLM_ATTR(drop_count, 0644, drop_count_show, drop_count_store);
static struct attribute *gdlm_attrs[] = {
&gdlm_attr_proto_name.attr,
@@ -157,7 +145,6 @@ static struct attribute *gdlm_attrs[] = {
&gdlm_attr_recover.attr,
&gdlm_attr_recover_done.attr,
&gdlm_attr_recover_status.attr,
- &gdlm_attr_drop_count.attr,
NULL,
};
diff --git a/fs/gfs2/locking/dlm/thread.c b/fs/gfs2/locking/dlm/thread.c
index e53db6fd28a..38823efd698 100644
--- a/fs/gfs2/locking/dlm/thread.c
+++ b/fs/gfs2/locking/dlm/thread.c
@@ -9,367 +9,60 @@
#include "lock_dlm.h"
-/* 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 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", lp->bast_mode);
- }
-
- ls->fscb(ls->sdp, cb, &lp->lockname);
-}
-
-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 process_complete(struct gdlm_lock *lp)
-{
- struct gdlm_ls *ls = lp->ls;
- struct lm_async_cb acb;
- s16 prev_mode = lp->cur;
-
- 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);
- if (lp->lksb.sb_status == -EDEADLOCK &&
- lp->ls->fsflags & LM_MFLAG_CONV_NODROP) {
- lp->req = lp->cur;
- acb.lc_ret |= LM_OUT_CONV_DEADLK;
- if (lp->cur == DLM_LOCK_IV)
- lp->lksb.sb_lkid = 0;
- goto out;
- } else
- 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);
-
- if (!test_and_clear_bit(LFL_NOCACHE, &lp->flags) &&
- (lp->cur > DLM_LOCK_NL) && (prev_mode > DLM_LOCK_NL))
- acb.lc_ret |= LM_OUT_CACHEABLE;
-
- ls->fscb(ls->sdp, LM_CB_ASYNC, &acb);
-}
-
-static inline int no_work(struct gdlm_ls *ls, int blocking)
+static inline int no_work(struct gdlm_ls *ls)
{
int ret;
spin_lock(&ls->async_lock);
- ret = list_empty(&ls->complete) && list_empty(&ls->submit);
- if (ret && blocking)
- ret = list_empty(&ls->blocking);
+ ret = list_empty(&ls->submit);
spin_unlock(&ls->async_lock);
return ret;
}
-static inline int check_drop(struct gdlm_ls *ls)
-{
- if (!ls->drop_locks_count)
- return 0;
-
- if (time_after(jiffies, ls->drop_time + ls->drop_locks_period * HZ)) {
- ls->drop_time = jiffies;
- if (ls->all_locks_count >= ls->drop_locks_count)
- return 1;
- }
- return 0;
-}
-
-static int gdlm_thread(void *data, int blist)
+static int gdlm_thread(void *data)
{
struct gdlm_ls *ls = (struct gdlm_ls *) data;
struct gdlm_lock *lp = NULL;
- uint8_t complete, blocking, submit, drop;
-
- /* Only thread1 is allowed to do blocking callbacks since gfs
- may wait for a completion callback within a blocking cb. */
while (!kthread_should_stop()) {
wait_event_interruptible(ls->thread_wait,
- !no_work(ls, blist) || kthread_should_stop());
-
- complete = blocking = submit = drop = 0;
+ !no_work(ls) || kthread_should_stop());
spin_lock(&ls->async_lock);
- if (blist && !list_empty(&ls->blocking)) {
- lp = list_entry(ls->blocking.next, struct gdlm_lock,
- blist);
- list_del_init(&lp->blist);
- blocking = lp->bast_mode;
- lp->bast_mode = 0;
- } else if (!list_empty(&ls->complete)) {
- lp = list_entry(ls->complete.next, struct gdlm_lock,
- clist);
- list_del_init(&lp->clist);
- complete = 1;
- } else if (!list_empty(&ls->submit)) {
+ if (!list_empty(&ls->submit)) {
lp = list_entry(ls->submit.next, struct gdlm_lock,
delay_list);
list_del_init(&lp->delay_list);
- submit = 1;
+ spin_unlock(&ls->async_lock);
+ gdlm_do_lock(lp);
+ spin_lock(&ls->async_lock);
}
-
- drop = check_drop(ls);
spin_unlock(&ls->async_lock);
-
- if (complete)
- process_complete(lp);
-
- else if (blocking)
- process_blocking(lp, blocking);
-
- else if (submit)
- gdlm_do_lock(lp);
-
- if (drop)
- ls->fscb(ls->sdp, LM_CB_DROPLOCKS, NULL);
-
- schedule();
}
return 0;
}
-static int gdlm_thread1(void *data)
-{
- return gdlm_thread(data, 1);
-}
-
-static int gdlm_thread2(void *data)
-{
- return gdlm_thread(data, 0);
-}
-
int gdlm_init_threads(struct gdlm_ls *ls)
{
struct task_struct *p;
int error;
- p = kthread_run(gdlm_thread1, ls, "lock_dlm1");
- error = IS_ERR(p);
- if (error) {
- log_error("can't start lock_dlm1 thread %d", error);
- return error;
- }
- ls->thread1 = p;
-
- p = kthread_run(gdlm_thread2, ls, "lock_dlm2");
+ p = kthread_run(gdlm_thread, ls, "lock_dlm");
error = IS_ERR(p);
if (error) {
- log_error("can't start lock_dlm2 thread %d", error);
- kthread_stop(ls->thread1);
+ log_error("can't start lock_dlm thread %d", error);
return error;
}
- ls->thread2 = p;
+ ls->thread = p;
return 0;
}
void gdlm_release_threads(struct gdlm_ls *ls)
{
- kthread_stop(ls->thread1);
- kthread_stop(ls->thread2);
+ kthread_stop(ls->thread);
}
diff --git a/fs/gfs2/locking/nolock/Makefile b/fs/gfs2/locking/nolock/Makefile
deleted file mode 100644
index 35e9730bc3a..00000000000
--- a/fs/gfs2/locking/nolock/Makefile
+++ /dev/null
@@ -1,3 +0,0 @@
-obj-$(CONFIG_GFS2_FS_LOCKING_NOLOCK) += lock_nolock.o
-lock_nolock-y := main.o
-
diff --git a/fs/gfs2/locking/nolock/main.c b/fs/gfs2/locking/nolock/main.c
deleted file mode 100644
index 284a5ece8d9..00000000000
--- a/fs/gfs2/locking/nolock/main.c
+++ /dev/null
@@ -1,238 +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/module.h>
-#include <linux/slab.h>
-#include <linux/init.h>
-#include <linux/types.h>
-#include <linux/fs.h>
-#include <linux/lm_interface.h>
-
-struct nolock_lockspace {
- unsigned int nl_lvb_size;
-};
-
-static const struct lm_lockops nolock_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)
-{
- 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_others_may_mount(void *lockspace)
-{
-}
-
-static void nolock_unmount(void *lockspace)
-{
- struct nolock_lockspace *nl = lockspace;
- kfree(nl);
-}
-
-static void nolock_withdraw(void *lockspace)
-{
-}
-
-/**
- * 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_lock - acquire a lock
- * @lock: the lock to manipulate
- * @cur_state: the current state
- * @req_state: the requested state
- * @flags: modifier flags
- *
- * Returns: A bitmap of LM_OUT_*
- */
-
-static unsigned int nolock_lock(void *lock, unsigned int cur_state,
- unsigned int req_state, unsigned int flags)
-{
- return req_state | LM_OUT_CACHEABLE;
-}
-
-/**
- * nolock_unlock - unlock a lock
- * @lock: the lock to manipulate
- * @cur_state: the current state
- *
- * Returns: 0
- */
-
-static unsigned int nolock_unlock(void *lock, unsigned int cur_state)
-{
- return 0;
-}
-
-static void nolock_cancel(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_NOFS);
- 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_plock_get(void *lockspace, struct lm_lockname *name,
- struct file *file, struct file_lock *fl)
-{
- posix_test_lock(file, fl);
-
- return 0;
-}
-
-static int nolock_plock(void *lockspace, struct lm_lockname *name,
- struct file *file, int cmd, struct file_lock *fl)
-{
- int error;
- error = posix_lock_file_wait(file, fl);
- return error;
-}
-
-static int nolock_punlock(void *lockspace, struct lm_lockname *name,
- struct file *file, struct file_lock *fl)
-{
- int error;
- error = posix_lock_file_wait(file, fl);
- return error;
-}
-
-static void nolock_recovery_done(void *lockspace, unsigned int jid,
- unsigned int message)
-{
-}
-
-static const struct lm_lockops nolock_ops = {
- .lm_proto_name = "lock_nolock",
- .lm_mount = nolock_mount,
- .lm_others_may_mount = nolock_others_may_mount,
- .lm_unmount = nolock_unmount,
- .lm_withdraw = nolock_withdraw,
- .lm_get_lock = nolock_get_lock,
- .lm_put_lock = nolock_put_lock,
- .lm_lock = nolock_lock,
- .lm_unlock = nolock_unlock,
- .lm_cancel = nolock_cancel,
- .lm_hold_lvb = nolock_hold_lvb,
- .lm_unhold_lvb = nolock_unhold_lvb,
- .lm_plock_get = nolock_plock_get,
- .lm_plock = nolock_plock,
- .lm_punlock = nolock_punlock,
- .lm_recovery_done = nolock_recovery_done,
- .lm_owner = THIS_MODULE,
-};
-
-static int __init init_nolock(void)
-{
- int error;
-
- error = gfs2_register_lockproto(&nolock_ops);
- if (error) {
- printk(KERN_WARNING
- "lock_nolock: can't register protocol: %d\n", error);
- return error;
- }
-
- printk(KERN_INFO
- "Lock_Nolock (built %s %s) installed\n", __DATE__, __TIME__);
- return 0;
-}
-
-static void __exit exit_nolock(void)
-{
- gfs2_unregister_lockproto(&nolock_ops);
-}
-
-module_init(init_nolock);
-module_exit(exit_nolock);
-
-MODULE_DESCRIPTION("GFS Nolock Locking Module");
-MODULE_AUTHOR("Red Hat, Inc.");
-MODULE_LICENSE("GPL");
-