[GFS2] Move glock hash table out of superblock
There are several reasons why we want to do this:
- Firstly its large and thus we'll scale better with multiple
GFS2 fs mounted at the same time
- Secondly its easier to scale its size as required (thats a plan
for later patches)
- Thirdly, we can use kzalloc rather than vmalloc when allocating
the superblock (its now only 4888 bytes)
- Fourth its all part of my plan to eventually be able to use RCU
with the glock hash.
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
diff --git a/fs/gfs2/glock.c b/fs/gfs2/glock.c
index 0076967..5759f52 100644
--- a/fs/gfs2/glock.c
+++ b/fs/gfs2/glock.c
@@ -49,6 +49,8 @@
static int gfs2_dump_lockstate(struct gfs2_sbd *sdp);
static int dump_glock(struct gfs2_glock *gl);
+static struct gfs2_gl_hash_bucket gl_hash_table[GFS2_GL_HASH_SIZE];
+
/**
* relaxed_state_ok - is a requested lock compatible with the current lock mode?
* @actual: the current state of the lock
@@ -231,10 +233,10 @@
* Returns: NULL, or the struct gfs2_glock with the requested number
*/
-static struct gfs2_glock *gfs2_glock_find(struct gfs2_sbd *sdp,
+static struct gfs2_glock *gfs2_glock_find(const struct gfs2_sbd *sdp,
const struct lm_lockname *name)
{
- struct gfs2_gl_hash_bucket *bucket = &sdp->sd_gl_hash[gl_hash(sdp, name)];
+ struct gfs2_gl_hash_bucket *bucket = &gl_hash_table[gl_hash(sdp, name)];
struct gfs2_glock *gl;
read_lock(&bucket->hb_lock);
@@ -268,7 +270,7 @@
name.ln_number = number;
name.ln_type = glops->go_type;
- bucket = &sdp->sd_gl_hash[gl_hash(sdp, &name)];
+ bucket = &gl_hash_table[gl_hash(sdp, &name)];
read_lock(&bucket->hb_lock);
gl = search_bucket(bucket, sdp, &name);
@@ -648,9 +650,9 @@
set_bit(HIF_MUTEX, &gh.gh_iflags);
spin_lock(&gl->gl_spin);
- if (test_and_set_bit(GLF_LOCK, &gl->gl_flags))
+ if (test_and_set_bit(GLF_LOCK, &gl->gl_flags)) {
list_add_tail(&gh.gh_list, &gl->gl_waiters1);
- else {
+ } else {
gl->gl_owner = current;
gl->gl_ip = (unsigned long)__builtin_return_address(0);
complete(&gh.gh_wait);
@@ -673,9 +675,9 @@
int acquired = 1;
spin_lock(&gl->gl_spin);
- if (test_and_set_bit(GLF_LOCK, &gl->gl_flags))
+ if (test_and_set_bit(GLF_LOCK, &gl->gl_flags)) {
acquired = 0;
- else {
+ } else {
gl->gl_owner = current;
gl->gl_ip = (unsigned long)__builtin_return_address(0);
}
@@ -830,9 +832,9 @@
spin_lock(&gl->gl_spin);
list_del_init(&gh->gh_list);
if (gl->gl_state == gh->gh_state ||
- gl->gl_state == LM_ST_UNLOCKED)
+ gl->gl_state == LM_ST_UNLOCKED) {
gh->gh_error = 0;
- else {
+ } else {
if (gfs2_assert_warn(sdp, gh->gh_flags &
(LM_FLAG_TRY | LM_FLAG_TRY_1CB)) == -1)
fs_warn(sdp, "ret = 0x%.8X\n", ret);
@@ -1090,8 +1092,7 @@
return gh->gh_error;
gfs2_assert_withdraw(sdp, test_bit(HIF_HOLDER, &gh->gh_iflags));
- gfs2_assert_withdraw(sdp, relaxed_state_ok(gl->gl_state,
- gh->gh_state,
+ gfs2_assert_withdraw(sdp, relaxed_state_ok(gl->gl_state, gh->gh_state,
gh->gh_flags));
if (test_bit(HIF_FIRST, &gh->gh_iflags)) {
@@ -1901,6 +1902,8 @@
if (test_bit(GLF_PLUG, &gl->gl_flags))
continue;
+ if (gl->gl_sbd != sdp)
+ continue;
/* examiner() must glock_put() */
gfs2_glock_hold(gl);
@@ -1953,7 +1956,7 @@
unsigned int x;
for (x = 0; x < GFS2_GL_HASH_SIZE; x++) {
- examine_bucket(scan_glock, sdp, &sdp->sd_gl_hash[x]);
+ examine_bucket(scan_glock, sdp, &gl_hash_table[x]);
cond_resched();
}
}
@@ -2012,7 +2015,7 @@
cont = 0;
for (x = 0; x < GFS2_GL_HASH_SIZE; x++)
- if (examine_bucket(clear_glock, sdp, &sdp->sd_gl_hash[x]))
+ if (examine_bucket(clear_glock, sdp, &gl_hash_table[x]))
cont = 1;
if (!wait || !cont)
@@ -2114,14 +2117,13 @@
spin_lock(&gl->gl_spin);
- printk(KERN_INFO "Glock 0x%p (%u, %llu)\n",
- gl,
- gl->gl_name.ln_type,
+ printk(KERN_INFO "Glock 0x%p (%u, %llu)\n", gl, gl->gl_name.ln_type,
(unsigned long long)gl->gl_name.ln_number);
printk(KERN_INFO " gl_flags =");
- for (x = 0; x < 32; x++)
+ for (x = 0; x < 32; x++) {
if (test_bit(x, &gl->gl_flags))
printk(" %u", x);
+ }
printk(" \n");
printk(KERN_INFO " gl_ref = %d\n", atomic_read(&gl->gl_ref.refcount));
printk(KERN_INFO " gl_state = %u\n", gl->gl_state);
@@ -2136,8 +2138,7 @@
printk(KERN_INFO " reclaim = %s\n",
(list_empty(&gl->gl_reclaim)) ? "no" : "yes");
if (gl->gl_aspace)
- printk(KERN_INFO " aspace = 0x%p nrpages = %lu\n",
- gl->gl_aspace,
+ printk(KERN_INFO " aspace = 0x%p nrpages = %lu\n", gl->gl_aspace,
gl->gl_aspace->i_mapping->nrpages);
else
printk(KERN_INFO " aspace = no\n");
@@ -2203,13 +2204,15 @@
int error = 0;
for (x = 0; x < GFS2_GL_HASH_SIZE; x++) {
- bucket = &sdp->sd_gl_hash[x];
+ bucket = &gl_hash_table[x];
read_lock(&bucket->hb_lock);
list_for_each_entry(gl, &bucket->hb_list, gl_list) {
if (test_bit(GLF_PLUG, &gl->gl_flags))
continue;
+ if (gl->gl_sbd != sdp)
+ continue;
error = dump_glock(gl);
if (error)
@@ -2226,3 +2229,14 @@
return error;
}
+int __init gfs2_glock_init(void)
+{
+ unsigned i;
+ for(i = 0; i < GFS2_GL_HASH_SIZE; i++) {
+ struct gfs2_gl_hash_bucket *hb = &gl_hash_table[i];
+ rwlock_init(&hb->hb_lock);
+ INIT_LIST_HEAD(&hb->hb_list);
+ }
+ return 0;
+}
+