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[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>
This commit is contained in:
Steven Whitehouse
parent
b8547856f9
commit
85d1da67f7
@ -49,6 +49,8 @@ typedef void (*glock_examiner) (struct gfs2_glock * gl);
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static int gfs2_dump_lockstate(struct gfs2_sbd *sdp);
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static int dump_glock(struct gfs2_glock *gl);
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static struct gfs2_gl_hash_bucket gl_hash_table[GFS2_GL_HASH_SIZE];
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/**
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* relaxed_state_ok - is a requested lock compatible with the current lock mode?
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* @actual: the current state of the lock
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@ -231,10 +233,10 @@ static struct gfs2_glock *search_bucket(struct gfs2_gl_hash_bucket *bucket,
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* Returns: NULL, or the struct gfs2_glock with the requested number
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*/
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static struct gfs2_glock *gfs2_glock_find(struct gfs2_sbd *sdp,
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static struct gfs2_glock *gfs2_glock_find(const struct gfs2_sbd *sdp,
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const struct lm_lockname *name)
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{
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struct gfs2_gl_hash_bucket *bucket = &sdp->sd_gl_hash[gl_hash(sdp, name)];
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struct gfs2_gl_hash_bucket *bucket = &gl_hash_table[gl_hash(sdp, name)];
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struct gfs2_glock *gl;
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read_lock(&bucket->hb_lock);
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@ -268,7 +270,7 @@ int gfs2_glock_get(struct gfs2_sbd *sdp, u64 number,
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name.ln_number = number;
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name.ln_type = glops->go_type;
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bucket = &sdp->sd_gl_hash[gl_hash(sdp, &name)];
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bucket = &gl_hash_table[gl_hash(sdp, &name)];
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read_lock(&bucket->hb_lock);
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gl = search_bucket(bucket, sdp, &name);
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@ -648,9 +650,9 @@ static void gfs2_glmutex_lock(struct gfs2_glock *gl)
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set_bit(HIF_MUTEX, &gh.gh_iflags);
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spin_lock(&gl->gl_spin);
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if (test_and_set_bit(GLF_LOCK, &gl->gl_flags))
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if (test_and_set_bit(GLF_LOCK, &gl->gl_flags)) {
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list_add_tail(&gh.gh_list, &gl->gl_waiters1);
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else {
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} else {
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gl->gl_owner = current;
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gl->gl_ip = (unsigned long)__builtin_return_address(0);
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complete(&gh.gh_wait);
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@ -673,9 +675,9 @@ static int gfs2_glmutex_trylock(struct gfs2_glock *gl)
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int acquired = 1;
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spin_lock(&gl->gl_spin);
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if (test_and_set_bit(GLF_LOCK, &gl->gl_flags))
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if (test_and_set_bit(GLF_LOCK, &gl->gl_flags)) {
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acquired = 0;
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else {
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} else {
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gl->gl_owner = current;
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gl->gl_ip = (unsigned long)__builtin_return_address(0);
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}
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@ -830,9 +832,9 @@ static void xmote_bh(struct gfs2_glock *gl, unsigned int ret)
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spin_lock(&gl->gl_spin);
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list_del_init(&gh->gh_list);
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if (gl->gl_state == gh->gh_state ||
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gl->gl_state == LM_ST_UNLOCKED)
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gl->gl_state == LM_ST_UNLOCKED) {
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gh->gh_error = 0;
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else {
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} else {
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if (gfs2_assert_warn(sdp, gh->gh_flags &
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(LM_FLAG_TRY | LM_FLAG_TRY_1CB)) == -1)
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fs_warn(sdp, "ret = 0x%.8X\n", ret);
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@ -1090,8 +1092,7 @@ static int glock_wait_internal(struct gfs2_holder *gh)
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return gh->gh_error;
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gfs2_assert_withdraw(sdp, test_bit(HIF_HOLDER, &gh->gh_iflags));
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gfs2_assert_withdraw(sdp, relaxed_state_ok(gl->gl_state,
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gh->gh_state,
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gfs2_assert_withdraw(sdp, relaxed_state_ok(gl->gl_state, gh->gh_state,
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gh->gh_flags));
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if (test_bit(HIF_FIRST, &gh->gh_iflags)) {
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@ -1901,6 +1902,8 @@ static int examine_bucket(glock_examiner examiner, struct gfs2_sbd *sdp,
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if (test_bit(GLF_PLUG, &gl->gl_flags))
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continue;
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if (gl->gl_sbd != sdp)
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continue;
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/* examiner() must glock_put() */
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gfs2_glock_hold(gl);
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@ -1953,7 +1956,7 @@ void gfs2_scand_internal(struct gfs2_sbd *sdp)
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unsigned int x;
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for (x = 0; x < GFS2_GL_HASH_SIZE; x++) {
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examine_bucket(scan_glock, sdp, &sdp->sd_gl_hash[x]);
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examine_bucket(scan_glock, sdp, &gl_hash_table[x]);
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cond_resched();
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}
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}
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@ -2012,7 +2015,7 @@ void gfs2_gl_hash_clear(struct gfs2_sbd *sdp, int wait)
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cont = 0;
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for (x = 0; x < GFS2_GL_HASH_SIZE; x++)
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if (examine_bucket(clear_glock, sdp, &sdp->sd_gl_hash[x]))
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if (examine_bucket(clear_glock, sdp, &gl_hash_table[x]))
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cont = 1;
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if (!wait || !cont)
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@ -2114,14 +2117,13 @@ static int dump_glock(struct gfs2_glock *gl)
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spin_lock(&gl->gl_spin);
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printk(KERN_INFO "Glock 0x%p (%u, %llu)\n",
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gl,
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gl->gl_name.ln_type,
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printk(KERN_INFO "Glock 0x%p (%u, %llu)\n", gl, gl->gl_name.ln_type,
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(unsigned long long)gl->gl_name.ln_number);
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printk(KERN_INFO " gl_flags =");
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for (x = 0; x < 32; x++)
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for (x = 0; x < 32; x++) {
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if (test_bit(x, &gl->gl_flags))
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printk(" %u", x);
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}
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printk(" \n");
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printk(KERN_INFO " gl_ref = %d\n", atomic_read(&gl->gl_ref.refcount));
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printk(KERN_INFO " gl_state = %u\n", gl->gl_state);
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@ -2136,8 +2138,7 @@ static int dump_glock(struct gfs2_glock *gl)
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printk(KERN_INFO " reclaim = %s\n",
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(list_empty(&gl->gl_reclaim)) ? "no" : "yes");
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if (gl->gl_aspace)
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printk(KERN_INFO " aspace = 0x%p nrpages = %lu\n",
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gl->gl_aspace,
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printk(KERN_INFO " aspace = 0x%p nrpages = %lu\n", gl->gl_aspace,
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gl->gl_aspace->i_mapping->nrpages);
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else
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printk(KERN_INFO " aspace = no\n");
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@ -2203,13 +2204,15 @@ static int gfs2_dump_lockstate(struct gfs2_sbd *sdp)
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int error = 0;
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for (x = 0; x < GFS2_GL_HASH_SIZE; x++) {
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bucket = &sdp->sd_gl_hash[x];
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bucket = &gl_hash_table[x];
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read_lock(&bucket->hb_lock);
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list_for_each_entry(gl, &bucket->hb_list, gl_list) {
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if (test_bit(GLF_PLUG, &gl->gl_flags))
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continue;
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if (gl->gl_sbd != sdp)
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continue;
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error = dump_glock(gl);
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if (error)
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@ -2226,3 +2229,14 @@ static int gfs2_dump_lockstate(struct gfs2_sbd *sdp)
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return error;
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}
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int __init gfs2_glock_init(void)
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{
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unsigned i;
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for(i = 0; i < GFS2_GL_HASH_SIZE; i++) {
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struct gfs2_gl_hash_bucket *hb = &gl_hash_table[i];
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rwlock_init(&hb->hb_lock);
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INIT_LIST_HEAD(&hb->hb_list);
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}
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return 0;
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}
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@ -150,4 +150,6 @@ void gfs2_reclaim_glock(struct gfs2_sbd *sdp);
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void gfs2_scand_internal(struct gfs2_sbd *sdp);
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void gfs2_gl_hash_clear(struct gfs2_sbd *sdp, int wait);
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int __init gfs2_glock_init(void);
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#endif /* __GLOCK_DOT_H__ */
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@ -30,7 +30,6 @@ struct gfs2_quota_data;
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struct gfs2_trans;
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struct gfs2_ail;
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struct gfs2_jdesc;
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struct gfs2_gl_hash_bucket;
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struct gfs2_sbd;
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typedef void (*gfs2_glop_bh_t) (struct gfs2_glock *gl, unsigned int ret);
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@ -107,6 +106,11 @@ struct gfs2_bufdata {
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struct list_head bd_ail_gl_list;
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};
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struct gfs2_gl_hash_bucket {
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rwlock_t hb_lock;
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struct list_head hb_list;
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};
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struct gfs2_glock_operations {
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void (*go_xmote_th) (struct gfs2_glock * gl, unsigned int state,
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int flags);
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@ -442,11 +446,6 @@ struct gfs2_tune {
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unsigned int gt_statfs_slow;
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};
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struct gfs2_gl_hash_bucket {
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rwlock_t hb_lock;
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struct list_head hb_list;
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};
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enum {
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SDF_JOURNAL_CHECKED = 0,
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SDF_JOURNAL_LIVE = 1,
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@ -489,7 +488,6 @@ struct gfs2_sbd {
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/* Lock Stuff */
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struct lm_lockstruct sd_lockstruct;
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struct gfs2_gl_hash_bucket sd_gl_hash[GFS2_GL_HASH_SIZE];
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struct list_head sd_reclaim_list;
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spinlock_t sd_reclaim_lock;
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wait_queue_head_t sd_reclaim_wq;
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@ -23,6 +23,7 @@
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#include "ops_fstype.h"
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#include "sys.h"
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#include "util.h"
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#include "glock.h"
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static void gfs2_init_inode_once(void *foo, kmem_cache_t *cachep, unsigned long flags)
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{
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@ -69,8 +70,11 @@ static int __init init_gfs2_fs(void)
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if (error)
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return error;
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error = -ENOMEM;
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error = gfs2_glock_init();
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if (error)
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goto fail;
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error = -ENOMEM;
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gfs2_glock_cachep = kmem_cache_create("gfs2_glock",
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sizeof(struct gfs2_glock),
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0, 0,
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@ -45,23 +45,16 @@ extern struct dentry_operations gfs2_dops;
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static struct gfs2_sbd *init_sbd(struct super_block *sb)
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{
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struct gfs2_sbd *sdp;
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unsigned int x;
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sdp = vmalloc(sizeof(struct gfs2_sbd));
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sdp = kzalloc(sizeof(struct gfs2_sbd), GFP_KERNEL);
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if (!sdp)
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return NULL;
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memset(sdp, 0, sizeof(struct gfs2_sbd));
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sb->s_fs_info = sdp;
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sdp->sd_vfs = sb;
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gfs2_tune_init(&sdp->sd_tune);
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for (x = 0; x < GFS2_GL_HASH_SIZE; x++) {
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rwlock_init(&sdp->sd_gl_hash[x].hb_lock);
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INIT_LIST_HEAD(&sdp->sd_gl_hash[x].hb_list);
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}
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INIT_LIST_HEAD(&sdp->sd_reclaim_list);
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spin_lock_init(&sdp->sd_reclaim_lock);
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init_waitqueue_head(&sdp->sd_reclaim_wq);
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