[Cluster-devel] [PATCH 4/5] gfs2: Remove gl_spin define
Bob Peterson
rpeterso at redhat.com
Thu Nov 5 17:26:47 UTC 2015
From: Andreas Gruenbacher <agruenba at redhat.com>
Commit e66cf161 replaced the gl_spin spinlock in struct gfs2_glock with a
gl_lockref lockref and defined gl_spin as gl_lockref.lock (the spinlock in
gl_lockref). Remove that define to make the references to gl_lockref.lock more
obvious.
Signed-off-by: Andreas Gruenbacher <andreas.gruenbacher at gmail.com>
Signed-off-by: Bob Peterson <rpeterso at redhat.com>
---
Documentation/filesystems/gfs2-glocks.txt | 6 +--
fs/gfs2/glock.c | 84 +++++++++++++++----------------
fs/gfs2/glock.h | 4 +-
fs/gfs2/glops.c | 10 ++--
fs/gfs2/incore.h | 3 +-
fs/gfs2/main.c | 2 +-
fs/gfs2/rgrp.c | 4 +-
7 files changed, 56 insertions(+), 57 deletions(-)
diff --git a/Documentation/filesystems/gfs2-glocks.txt b/Documentation/filesystems/gfs2-glocks.txt
index fcc7995..1fb12f9 100644
--- a/Documentation/filesystems/gfs2-glocks.txt
+++ b/Documentation/filesystems/gfs2-glocks.txt
@@ -5,7 +5,7 @@ This documents the basic principles of the glock state machine
internals. Each glock (struct gfs2_glock in fs/gfs2/incore.h)
has two main (internal) locks:
- 1. A spinlock (gl_spin) which protects the internal state such
+ 1. A spinlock (gl_lockref.lock) which protects the internal state such
as gl_state, gl_target and the list of holders (gl_holders)
2. A non-blocking bit lock, GLF_LOCK, which is used to prevent other
threads from making calls to the DLM, etc. at the same time. If a
@@ -82,8 +82,8 @@ rather than via the glock.
Locking rules for glock operations:
-Operation | GLF_LOCK bit lock held | gl_spin spinlock held
------------------------------------------------------------------
+Operation | GLF_LOCK bit lock held | gl_lockref.lock spinlock held
+-------------------------------------------------------------------------
go_xmote_th | Yes | No
go_xmote_bh | Yes | No
go_inval | Yes | No
diff --git a/fs/gfs2/glock.c b/fs/gfs2/glock.c
index 9bd1244..32e7471 100644
--- a/fs/gfs2/glock.c
+++ b/fs/gfs2/glock.c
@@ -246,8 +246,8 @@ static inline void do_error(struct gfs2_glock *gl, const int ret)
*/
static int do_promote(struct gfs2_glock *gl)
-__releases(&gl->gl_spin)
-__acquires(&gl->gl_spin)
+__releases(&gl->gl_lockref.lock)
+__acquires(&gl->gl_lockref.lock)
{
const struct gfs2_glock_operations *glops = gl->gl_ops;
struct gfs2_holder *gh, *tmp;
@@ -260,10 +260,10 @@ restart:
if (may_grant(gl, gh)) {
if (gh->gh_list.prev == &gl->gl_holders &&
glops->go_lock) {
- spin_unlock(&gl->gl_spin);
+ spin_unlock(&gl->gl_lockref.lock);
/* FIXME: eliminate this eventually */
ret = glops->go_lock(gh);
- spin_lock(&gl->gl_spin);
+ spin_lock(&gl->gl_lockref.lock);
if (ret) {
if (ret == 1)
return 2;
@@ -361,7 +361,7 @@ static void finish_xmote(struct gfs2_glock *gl, unsigned int ret)
unsigned state = ret & LM_OUT_ST_MASK;
int rv;
- spin_lock(&gl->gl_spin);
+ spin_lock(&gl->gl_lockref.lock);
trace_gfs2_glock_state_change(gl, state);
state_change(gl, state);
gh = find_first_waiter(gl);
@@ -405,7 +405,7 @@ retry:
pr_err("wanted %u got %u\n", gl->gl_target, state);
GLOCK_BUG_ON(gl, 1);
}
- spin_unlock(&gl->gl_spin);
+ spin_unlock(&gl->gl_lockref.lock);
return;
}
@@ -414,9 +414,9 @@ retry:
gfs2_demote_wake(gl);
if (state != LM_ST_UNLOCKED) {
if (glops->go_xmote_bh) {
- spin_unlock(&gl->gl_spin);
+ spin_unlock(&gl->gl_lockref.lock);
rv = glops->go_xmote_bh(gl, gh);
- spin_lock(&gl->gl_spin);
+ spin_lock(&gl->gl_lockref.lock);
if (rv) {
do_error(gl, rv);
goto out;
@@ -429,7 +429,7 @@ retry:
out:
clear_bit(GLF_LOCK, &gl->gl_flags);
out_locked:
- spin_unlock(&gl->gl_spin);
+ spin_unlock(&gl->gl_lockref.lock);
}
/**
@@ -441,8 +441,8 @@ out_locked:
*/
static void do_xmote(struct gfs2_glock *gl, struct gfs2_holder *gh, unsigned int target)
-__releases(&gl->gl_spin)
-__acquires(&gl->gl_spin)
+__releases(&gl->gl_lockref.lock)
+__acquires(&gl->gl_lockref.lock)
{
const struct gfs2_glock_operations *glops = gl->gl_ops;
struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
@@ -464,7 +464,7 @@ __acquires(&gl->gl_spin)
(gl->gl_state == LM_ST_EXCLUSIVE) ||
(lck_flags & (LM_FLAG_TRY|LM_FLAG_TRY_1CB)))
clear_bit(GLF_BLOCKING, &gl->gl_flags);
- spin_unlock(&gl->gl_spin);
+ spin_unlock(&gl->gl_lockref.lock);
if (glops->go_sync)
glops->go_sync(gl);
if (test_bit(GLF_INVALIDATE_IN_PROGRESS, &gl->gl_flags))
@@ -485,7 +485,7 @@ __acquires(&gl->gl_spin)
gfs2_glock_put(gl);
}
- spin_lock(&gl->gl_spin);
+ spin_lock(&gl->gl_lockref.lock);
}
/**
@@ -513,8 +513,8 @@ static inline struct gfs2_holder *find_first_holder(const struct gfs2_glock *gl)
*/
static void run_queue(struct gfs2_glock *gl, const int nonblock)
-__releases(&gl->gl_spin)
-__acquires(&gl->gl_spin)
+__releases(&gl->gl_lockref.lock)
+__acquires(&gl->gl_lockref.lock)
{
struct gfs2_holder *gh = NULL;
int ret;
@@ -596,7 +596,7 @@ static void glock_work_func(struct work_struct *work)
finish_xmote(gl, gl->gl_reply);
drop_ref = 1;
}
- spin_lock(&gl->gl_spin);
+ spin_lock(&gl->gl_lockref.lock);
if (test_bit(GLF_PENDING_DEMOTE, &gl->gl_flags) &&
gl->gl_state != LM_ST_UNLOCKED &&
gl->gl_demote_state != LM_ST_EXCLUSIVE) {
@@ -612,7 +612,7 @@ static void glock_work_func(struct work_struct *work)
}
}
run_queue(gl, 0);
- spin_unlock(&gl->gl_spin);
+ spin_unlock(&gl->gl_lockref.lock);
if (!delay)
gfs2_glock_put(gl);
else {
@@ -876,8 +876,8 @@ void gfs2_print_dbg(struct seq_file *seq, const char *fmt, ...)
*/
static inline void add_to_queue(struct gfs2_holder *gh)
-__releases(&gl->gl_spin)
-__acquires(&gl->gl_spin)
+__releases(&gl->gl_lockref.lock)
+__acquires(&gl->gl_lockref.lock)
{
struct gfs2_glock *gl = gh->gh_gl;
struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
@@ -926,10 +926,10 @@ fail:
do_cancel:
gh = list_entry(gl->gl_holders.next, struct gfs2_holder, gh_list);
if (!(gh->gh_flags & LM_FLAG_PRIORITY)) {
- spin_unlock(&gl->gl_spin);
+ spin_unlock(&gl->gl_lockref.lock);
if (sdp->sd_lockstruct.ls_ops->lm_cancel)
sdp->sd_lockstruct.ls_ops->lm_cancel(gl);
- spin_lock(&gl->gl_spin);
+ spin_lock(&gl->gl_lockref.lock);
}
return;
@@ -967,7 +967,7 @@ int gfs2_glock_nq(struct gfs2_holder *gh)
if (test_bit(GLF_LRU, &gl->gl_flags))
gfs2_glock_remove_from_lru(gl);
- spin_lock(&gl->gl_spin);
+ spin_lock(&gl->gl_lockref.lock);
add_to_queue(gh);
if (unlikely((LM_FLAG_NOEXP & gh->gh_flags) &&
test_and_clear_bit(GLF_FROZEN, &gl->gl_flags))) {
@@ -977,7 +977,7 @@ int gfs2_glock_nq(struct gfs2_holder *gh)
gl->gl_lockref.count--;
}
run_queue(gl, 1);
- spin_unlock(&gl->gl_spin);
+ spin_unlock(&gl->gl_lockref.lock);
if (!(gh->gh_flags & GL_ASYNC))
error = gfs2_glock_wait(gh);
@@ -1010,7 +1010,7 @@ void gfs2_glock_dq(struct gfs2_holder *gh)
unsigned delay = 0;
int fast_path = 0;
- spin_lock(&gl->gl_spin);
+ spin_lock(&gl->gl_lockref.lock);
if (gh->gh_flags & GL_NOCACHE)
handle_callback(gl, LM_ST_UNLOCKED, 0, false);
@@ -1018,9 +1018,9 @@ void gfs2_glock_dq(struct gfs2_holder *gh)
if (find_first_holder(gl) == NULL) {
if (glops->go_unlock) {
GLOCK_BUG_ON(gl, test_and_set_bit(GLF_LOCK, &gl->gl_flags));
- spin_unlock(&gl->gl_spin);
+ spin_unlock(&gl->gl_lockref.lock);
glops->go_unlock(gh);
- spin_lock(&gl->gl_spin);
+ spin_lock(&gl->gl_lockref.lock);
clear_bit(GLF_LOCK, &gl->gl_flags);
}
if (list_empty(&gl->gl_holders) &&
@@ -1033,7 +1033,7 @@ void gfs2_glock_dq(struct gfs2_holder *gh)
gfs2_glock_add_to_lru(gl);
trace_gfs2_glock_queue(gh, 0);
- spin_unlock(&gl->gl_spin);
+ spin_unlock(&gl->gl_lockref.lock);
if (likely(fast_path))
return;
@@ -1217,9 +1217,9 @@ void gfs2_glock_cb(struct gfs2_glock *gl, unsigned int state)
delay = gl->gl_hold_time;
}
- spin_lock(&gl->gl_spin);
+ spin_lock(&gl->gl_lockref.lock);
handle_callback(gl, state, delay, true);
- spin_unlock(&gl->gl_spin);
+ spin_unlock(&gl->gl_lockref.lock);
if (queue_delayed_work(glock_workqueue, &gl->gl_work, delay) == 0)
gfs2_glock_put(gl);
}
@@ -1259,7 +1259,7 @@ static int gfs2_should_freeze(const struct gfs2_glock *gl)
* @gl: Pointer to the glock
* @ret: The return value from the dlm
*
- * The gl_reply field is under the gl_spin lock so that it is ok
+ * The gl_reply field is under the gl_lockref.lock lock so that it is ok
* to use a bitfield shared with other glock state fields.
*/
@@ -1267,20 +1267,20 @@ void gfs2_glock_complete(struct gfs2_glock *gl, int ret)
{
struct lm_lockstruct *ls = &gl->gl_name.ln_sbd->sd_lockstruct;
- spin_lock(&gl->gl_spin);
+ spin_lock(&gl->gl_lockref.lock);
gl->gl_reply = ret;
if (unlikely(test_bit(DFL_BLOCK_LOCKS, &ls->ls_recover_flags))) {
if (gfs2_should_freeze(gl)) {
set_bit(GLF_FROZEN, &gl->gl_flags);
- spin_unlock(&gl->gl_spin);
+ spin_unlock(&gl->gl_lockref.lock);
return;
}
}
gl->gl_lockref.count++;
set_bit(GLF_REPLY_PENDING, &gl->gl_flags);
- spin_unlock(&gl->gl_spin);
+ spin_unlock(&gl->gl_lockref.lock);
if (queue_delayed_work(glock_workqueue, &gl->gl_work, 0) == 0)
gfs2_glock_put(gl);
@@ -1326,14 +1326,14 @@ __acquires(&lru_lock)
while(!list_empty(list)) {
gl = list_entry(list->next, struct gfs2_glock, gl_lru);
list_del_init(&gl->gl_lru);
- if (!spin_trylock(&gl->gl_spin)) {
+ if (!spin_trylock(&gl->gl_lockref.lock)) {
add_back_to_lru:
list_add(&gl->gl_lru, &lru_list);
atomic_inc(&lru_count);
continue;
}
if (test_and_set_bit(GLF_LOCK, &gl->gl_flags)) {
- spin_unlock(&gl->gl_spin);
+ spin_unlock(&gl->gl_lockref.lock);
goto add_back_to_lru;
}
clear_bit(GLF_LRU, &gl->gl_flags);
@@ -1343,7 +1343,7 @@ add_back_to_lru:
WARN_ON(!test_and_clear_bit(GLF_LOCK, &gl->gl_flags));
if (queue_delayed_work(glock_workqueue, &gl->gl_work, 0) == 0)
gl->gl_lockref.count--;
- spin_unlock(&gl->gl_spin);
+ spin_unlock(&gl->gl_lockref.lock);
cond_resched_lock(&lru_lock);
}
}
@@ -1461,10 +1461,10 @@ static void clear_glock(struct gfs2_glock *gl)
{
gfs2_glock_remove_from_lru(gl);
- spin_lock(&gl->gl_spin);
+ spin_lock(&gl->gl_lockref.lock);
if (gl->gl_state != LM_ST_UNLOCKED)
handle_callback(gl, LM_ST_UNLOCKED, 0, false);
- spin_unlock(&gl->gl_spin);
+ spin_unlock(&gl->gl_lockref.lock);
if (queue_delayed_work(glock_workqueue, &gl->gl_work, 0) == 0)
gfs2_glock_put(gl);
}
@@ -1482,9 +1482,9 @@ void gfs2_glock_thaw(struct gfs2_sbd *sdp)
static void dump_glock(struct seq_file *seq, struct gfs2_glock *gl)
{
- spin_lock(&gl->gl_spin);
+ spin_lock(&gl->gl_lockref.lock);
gfs2_dump_glock(seq, gl);
- spin_unlock(&gl->gl_spin);
+ spin_unlock(&gl->gl_lockref.lock);
}
static void dump_glock_func(struct gfs2_glock *gl)
@@ -1518,10 +1518,10 @@ void gfs2_glock_finish_truncate(struct gfs2_inode *ip)
ret = gfs2_truncatei_resume(ip);
gfs2_assert_withdraw(gl->gl_name.ln_sbd, ret == 0);
- spin_lock(&gl->gl_spin);
+ spin_lock(&gl->gl_lockref.lock);
clear_bit(GLF_LOCK, &gl->gl_flags);
run_queue(gl, 1);
- spin_unlock(&gl->gl_spin);
+ spin_unlock(&gl->gl_lockref.lock);
}
static const char *state2str(unsigned state)
diff --git a/fs/gfs2/glock.h b/fs/gfs2/glock.h
index 32572f7..f7cdaa8 100644
--- a/fs/gfs2/glock.h
+++ b/fs/gfs2/glock.h
@@ -141,7 +141,7 @@ static inline struct gfs2_holder *gfs2_glock_is_locked_by_me(struct gfs2_glock *
struct pid *pid;
/* Look in glock's list of holders for one with current task as owner */
- spin_lock(&gl->gl_spin);
+ spin_lock(&gl->gl_lockref.lock);
pid = task_pid(current);
list_for_each_entry(gh, &gl->gl_holders, gh_list) {
if (!test_bit(HIF_HOLDER, &gh->gh_iflags))
@@ -151,7 +151,7 @@ static inline struct gfs2_holder *gfs2_glock_is_locked_by_me(struct gfs2_glock *
}
gh = NULL;
out:
- spin_unlock(&gl->gl_spin);
+ spin_unlock(&gl->gl_lockref.lock);
return gh;
}
diff --git a/fs/gfs2/glops.c b/fs/gfs2/glops.c
index 1f6c9c3..f348cfb 100644
--- a/fs/gfs2/glops.c
+++ b/fs/gfs2/glops.c
@@ -146,11 +146,11 @@ static void rgrp_go_sync(struct gfs2_glock *gl)
struct gfs2_rgrpd *rgd;
int error;
- spin_lock(&gl->gl_spin);
+ spin_lock(&gl->gl_lockref.lock);
rgd = gl->gl_object;
if (rgd)
gfs2_rgrp_brelse(rgd);
- spin_unlock(&gl->gl_spin);
+ spin_unlock(&gl->gl_lockref.lock);
if (!test_and_clear_bit(GLF_DIRTY, &gl->gl_flags))
return;
@@ -162,11 +162,11 @@ static void rgrp_go_sync(struct gfs2_glock *gl)
mapping_set_error(mapping, error);
gfs2_ail_empty_gl(gl);
- spin_lock(&gl->gl_spin);
+ spin_lock(&gl->gl_lockref.lock);
rgd = gl->gl_object;
if (rgd)
gfs2_free_clones(rgd);
- spin_unlock(&gl->gl_spin);
+ spin_unlock(&gl->gl_lockref.lock);
}
/**
@@ -542,7 +542,7 @@ static int freeze_go_demote_ok(const struct gfs2_glock *gl)
* iopen_go_callback - schedule the dcache entry for the inode to be deleted
* @gl: the glock
*
- * gl_spin lock is held while calling this
+ * gl_lockref.lock lock is held while calling this
*/
static void iopen_go_callback(struct gfs2_glock *gl, bool remote)
{
diff --git a/fs/gfs2/incore.h b/fs/gfs2/incore.h
index 121ed08..de7b4f9 100644
--- a/fs/gfs2/incore.h
+++ b/fs/gfs2/incore.h
@@ -334,9 +334,8 @@ struct gfs2_glock {
struct lm_lockname gl_name;
struct lockref gl_lockref;
-#define gl_spin gl_lockref.lock
- /* State fields protected by gl_spin */
+ /* State fields protected by gl_lockref.lock */
unsigned int gl_state:2, /* Current state */
gl_target:2, /* Target state */
gl_demote_state:2, /* State requested by remote node */
diff --git a/fs/gfs2/main.c b/fs/gfs2/main.c
index 241a399..fb2b42c 100644
--- a/fs/gfs2/main.c
+++ b/fs/gfs2/main.c
@@ -50,7 +50,7 @@ static void gfs2_init_glock_once(void *foo)
struct gfs2_glock *gl = foo;
INIT_HLIST_BL_NODE(&gl->gl_list);
- spin_lock_init(&gl->gl_spin);
+ spin_lock_init(&gl->gl_lockref.lock);
INIT_LIST_HEAD(&gl->gl_holders);
INIT_LIST_HEAD(&gl->gl_lru);
INIT_LIST_HEAD(&gl->gl_ail_list);
diff --git a/fs/gfs2/rgrp.c b/fs/gfs2/rgrp.c
index 475985d..d29dd0c 100644
--- a/fs/gfs2/rgrp.c
+++ b/fs/gfs2/rgrp.c
@@ -729,9 +729,9 @@ void gfs2_clear_rgrpd(struct gfs2_sbd *sdp)
rb_erase(n, &sdp->sd_rindex_tree);
if (gl) {
- spin_lock(&gl->gl_spin);
+ spin_lock(&gl->gl_lockref.lock);
gl->gl_object = NULL;
- spin_unlock(&gl->gl_spin);
+ spin_unlock(&gl->gl_lockref.lock);
gfs2_glock_add_to_lru(gl);
gfs2_glock_put(gl);
}
--
2.4.3
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