![Thomas Gleixner](/assets/img/avatar_default.png)
ktime_set(S,N) was required for the timespec storage type and is still useful for situations where a Seconds and Nanoseconds part of a time value needs to be converted. For anything where the Seconds argument is 0, this is pointless and can be replaced with a simple assignment. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Peter Zijlstra <peterz@infradead.org>
2061 lines
51 KiB
C
2061 lines
51 KiB
C
/*
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* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
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* Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved.
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*
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* This copyrighted material is made available to anyone wishing to use,
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* modify, copy, or redistribute it subject to the terms and conditions
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* of the GNU General Public License version 2.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <linux/buffer_head.h>
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#include <linux/delay.h>
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#include <linux/sort.h>
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#include <linux/jhash.h>
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#include <linux/kallsyms.h>
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#include <linux/gfs2_ondisk.h>
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#include <linux/list.h>
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#include <linux/wait.h>
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#include <linux/module.h>
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#include <linux/uaccess.h>
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#include <linux/seq_file.h>
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#include <linux/debugfs.h>
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#include <linux/kthread.h>
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#include <linux/freezer.h>
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#include <linux/workqueue.h>
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#include <linux/jiffies.h>
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#include <linux/rcupdate.h>
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#include <linux/rculist_bl.h>
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#include <linux/bit_spinlock.h>
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#include <linux/percpu.h>
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#include <linux/list_sort.h>
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#include <linux/lockref.h>
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#include <linux/rhashtable.h>
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#include "gfs2.h"
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#include "incore.h"
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#include "glock.h"
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#include "glops.h"
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#include "inode.h"
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#include "lops.h"
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#include "meta_io.h"
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#include "quota.h"
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#include "super.h"
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#include "util.h"
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#include "bmap.h"
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#define CREATE_TRACE_POINTS
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#include "trace_gfs2.h"
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struct gfs2_glock_iter {
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struct gfs2_sbd *sdp; /* incore superblock */
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struct rhashtable_iter hti; /* rhashtable iterator */
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struct gfs2_glock *gl; /* current glock struct */
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loff_t last_pos; /* last position */
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};
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typedef void (*glock_examiner) (struct gfs2_glock * gl);
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static void do_xmote(struct gfs2_glock *gl, struct gfs2_holder *gh, unsigned int target);
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static struct dentry *gfs2_root;
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static struct workqueue_struct *glock_workqueue;
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struct workqueue_struct *gfs2_delete_workqueue;
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static LIST_HEAD(lru_list);
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static atomic_t lru_count = ATOMIC_INIT(0);
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static DEFINE_SPINLOCK(lru_lock);
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#define GFS2_GL_HASH_SHIFT 15
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#define GFS2_GL_HASH_SIZE BIT(GFS2_GL_HASH_SHIFT)
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static struct rhashtable_params ht_parms = {
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.nelem_hint = GFS2_GL_HASH_SIZE * 3 / 4,
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.key_len = sizeof(struct lm_lockname),
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.key_offset = offsetof(struct gfs2_glock, gl_name),
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.head_offset = offsetof(struct gfs2_glock, gl_node),
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};
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static struct rhashtable gl_hash_table;
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void gfs2_glock_free(struct gfs2_glock *gl)
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{
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struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
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if (gl->gl_ops->go_flags & GLOF_ASPACE) {
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kmem_cache_free(gfs2_glock_aspace_cachep, gl);
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} else {
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kfree(gl->gl_lksb.sb_lvbptr);
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kmem_cache_free(gfs2_glock_cachep, gl);
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}
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if (atomic_dec_and_test(&sdp->sd_glock_disposal))
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wake_up(&sdp->sd_glock_wait);
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}
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/**
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* gfs2_glock_hold() - increment reference count on glock
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* @gl: The glock to hold
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*
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*/
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static void gfs2_glock_hold(struct gfs2_glock *gl)
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{
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GLOCK_BUG_ON(gl, __lockref_is_dead(&gl->gl_lockref));
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lockref_get(&gl->gl_lockref);
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}
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/**
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* demote_ok - Check to see if it's ok to unlock a glock
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* @gl: the glock
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*
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* Returns: 1 if it's ok
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*/
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static int demote_ok(const struct gfs2_glock *gl)
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{
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const struct gfs2_glock_operations *glops = gl->gl_ops;
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if (gl->gl_state == LM_ST_UNLOCKED)
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return 0;
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if (!list_empty(&gl->gl_holders))
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return 0;
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if (glops->go_demote_ok)
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return glops->go_demote_ok(gl);
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return 1;
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}
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void gfs2_glock_add_to_lru(struct gfs2_glock *gl)
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{
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spin_lock(&lru_lock);
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if (!list_empty(&gl->gl_lru))
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list_del_init(&gl->gl_lru);
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else
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atomic_inc(&lru_count);
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list_add_tail(&gl->gl_lru, &lru_list);
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set_bit(GLF_LRU, &gl->gl_flags);
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spin_unlock(&lru_lock);
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}
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static void gfs2_glock_remove_from_lru(struct gfs2_glock *gl)
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{
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spin_lock(&lru_lock);
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if (!list_empty(&gl->gl_lru)) {
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list_del_init(&gl->gl_lru);
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atomic_dec(&lru_count);
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clear_bit(GLF_LRU, &gl->gl_flags);
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}
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spin_unlock(&lru_lock);
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}
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/**
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* gfs2_glock_put() - Decrement reference count on glock
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* @gl: The glock to put
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*
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*/
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void gfs2_glock_put(struct gfs2_glock *gl)
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{
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struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
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struct address_space *mapping = gfs2_glock2aspace(gl);
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if (lockref_put_or_lock(&gl->gl_lockref))
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return;
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lockref_mark_dead(&gl->gl_lockref);
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gfs2_glock_remove_from_lru(gl);
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spin_unlock(&gl->gl_lockref.lock);
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rhashtable_remove_fast(&gl_hash_table, &gl->gl_node, ht_parms);
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GLOCK_BUG_ON(gl, !list_empty(&gl->gl_holders));
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GLOCK_BUG_ON(gl, mapping && mapping->nrpages);
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trace_gfs2_glock_put(gl);
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sdp->sd_lockstruct.ls_ops->lm_put_lock(gl);
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}
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/**
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* may_grant - check if its ok to grant a new lock
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* @gl: The glock
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* @gh: The lock request which we wish to grant
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*
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* Returns: true if its ok to grant the lock
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*/
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static inline int may_grant(const struct gfs2_glock *gl, const struct gfs2_holder *gh)
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{
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const struct gfs2_holder *gh_head = list_entry(gl->gl_holders.next, const struct gfs2_holder, gh_list);
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if ((gh->gh_state == LM_ST_EXCLUSIVE ||
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gh_head->gh_state == LM_ST_EXCLUSIVE) && gh != gh_head)
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return 0;
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if (gl->gl_state == gh->gh_state)
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return 1;
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if (gh->gh_flags & GL_EXACT)
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return 0;
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if (gl->gl_state == LM_ST_EXCLUSIVE) {
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if (gh->gh_state == LM_ST_SHARED && gh_head->gh_state == LM_ST_SHARED)
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return 1;
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if (gh->gh_state == LM_ST_DEFERRED && gh_head->gh_state == LM_ST_DEFERRED)
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return 1;
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}
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if (gl->gl_state != LM_ST_UNLOCKED && (gh->gh_flags & LM_FLAG_ANY))
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return 1;
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return 0;
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}
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static void gfs2_holder_wake(struct gfs2_holder *gh)
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{
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clear_bit(HIF_WAIT, &gh->gh_iflags);
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smp_mb__after_atomic();
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wake_up_bit(&gh->gh_iflags, HIF_WAIT);
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}
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/**
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* do_error - Something unexpected has happened during a lock request
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*
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*/
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static void do_error(struct gfs2_glock *gl, const int ret)
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{
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struct gfs2_holder *gh, *tmp;
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list_for_each_entry_safe(gh, tmp, &gl->gl_holders, gh_list) {
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if (test_bit(HIF_HOLDER, &gh->gh_iflags))
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continue;
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if (ret & LM_OUT_ERROR)
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gh->gh_error = -EIO;
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else if (gh->gh_flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB))
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gh->gh_error = GLR_TRYFAILED;
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else
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continue;
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list_del_init(&gh->gh_list);
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trace_gfs2_glock_queue(gh, 0);
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gfs2_holder_wake(gh);
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}
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}
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/**
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* do_promote - promote as many requests as possible on the current queue
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* @gl: The glock
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*
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* Returns: 1 if there is a blocked holder at the head of the list, or 2
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* if a type specific operation is underway.
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*/
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static int do_promote(struct gfs2_glock *gl)
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__releases(&gl->gl_lockref.lock)
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__acquires(&gl->gl_lockref.lock)
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{
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const struct gfs2_glock_operations *glops = gl->gl_ops;
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struct gfs2_holder *gh, *tmp;
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int ret;
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restart:
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list_for_each_entry_safe(gh, tmp, &gl->gl_holders, gh_list) {
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if (test_bit(HIF_HOLDER, &gh->gh_iflags))
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continue;
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if (may_grant(gl, gh)) {
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if (gh->gh_list.prev == &gl->gl_holders &&
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glops->go_lock) {
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spin_unlock(&gl->gl_lockref.lock);
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/* FIXME: eliminate this eventually */
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ret = glops->go_lock(gh);
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spin_lock(&gl->gl_lockref.lock);
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if (ret) {
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if (ret == 1)
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return 2;
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gh->gh_error = ret;
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list_del_init(&gh->gh_list);
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trace_gfs2_glock_queue(gh, 0);
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gfs2_holder_wake(gh);
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goto restart;
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}
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set_bit(HIF_HOLDER, &gh->gh_iflags);
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trace_gfs2_promote(gh, 1);
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gfs2_holder_wake(gh);
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goto restart;
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}
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set_bit(HIF_HOLDER, &gh->gh_iflags);
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trace_gfs2_promote(gh, 0);
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gfs2_holder_wake(gh);
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continue;
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}
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if (gh->gh_list.prev == &gl->gl_holders)
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return 1;
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do_error(gl, 0);
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break;
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}
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return 0;
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}
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/**
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* find_first_waiter - find the first gh that's waiting for the glock
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* @gl: the glock
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*/
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static inline struct gfs2_holder *find_first_waiter(const struct gfs2_glock *gl)
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{
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struct gfs2_holder *gh;
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list_for_each_entry(gh, &gl->gl_holders, gh_list) {
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if (!test_bit(HIF_HOLDER, &gh->gh_iflags))
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return gh;
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}
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return NULL;
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}
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/**
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* state_change - record that the glock is now in a different state
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* @gl: the glock
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* @new_state the new state
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*
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*/
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static void state_change(struct gfs2_glock *gl, unsigned int new_state)
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{
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int held1, held2;
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held1 = (gl->gl_state != LM_ST_UNLOCKED);
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held2 = (new_state != LM_ST_UNLOCKED);
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if (held1 != held2) {
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GLOCK_BUG_ON(gl, __lockref_is_dead(&gl->gl_lockref));
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if (held2)
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gl->gl_lockref.count++;
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else
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gl->gl_lockref.count--;
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}
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if (held1 && held2 && list_empty(&gl->gl_holders))
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clear_bit(GLF_QUEUED, &gl->gl_flags);
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if (new_state != gl->gl_target)
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/* shorten our minimum hold time */
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gl->gl_hold_time = max(gl->gl_hold_time - GL_GLOCK_HOLD_DECR,
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GL_GLOCK_MIN_HOLD);
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gl->gl_state = new_state;
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gl->gl_tchange = jiffies;
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}
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static void gfs2_demote_wake(struct gfs2_glock *gl)
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{
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gl->gl_demote_state = LM_ST_EXCLUSIVE;
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clear_bit(GLF_DEMOTE, &gl->gl_flags);
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smp_mb__after_atomic();
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wake_up_bit(&gl->gl_flags, GLF_DEMOTE);
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}
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/**
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* finish_xmote - The DLM has replied to one of our lock requests
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* @gl: The glock
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* @ret: The status from the DLM
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*
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*/
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static void finish_xmote(struct gfs2_glock *gl, unsigned int ret)
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{
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const struct gfs2_glock_operations *glops = gl->gl_ops;
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struct gfs2_holder *gh;
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unsigned state = ret & LM_OUT_ST_MASK;
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int rv;
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spin_lock(&gl->gl_lockref.lock);
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trace_gfs2_glock_state_change(gl, state);
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state_change(gl, state);
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gh = find_first_waiter(gl);
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/* Demote to UN request arrived during demote to SH or DF */
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if (test_bit(GLF_DEMOTE_IN_PROGRESS, &gl->gl_flags) &&
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state != LM_ST_UNLOCKED && gl->gl_demote_state == LM_ST_UNLOCKED)
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gl->gl_target = LM_ST_UNLOCKED;
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/* Check for state != intended state */
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if (unlikely(state != gl->gl_target)) {
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if (gh && !test_bit(GLF_DEMOTE_IN_PROGRESS, &gl->gl_flags)) {
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/* move to back of queue and try next entry */
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if (ret & LM_OUT_CANCELED) {
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if ((gh->gh_flags & LM_FLAG_PRIORITY) == 0)
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list_move_tail(&gh->gh_list, &gl->gl_holders);
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gh = find_first_waiter(gl);
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gl->gl_target = gh->gh_state;
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goto retry;
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}
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/* Some error or failed "try lock" - report it */
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if ((ret & LM_OUT_ERROR) ||
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(gh->gh_flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB))) {
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gl->gl_target = gl->gl_state;
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do_error(gl, ret);
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goto out;
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}
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}
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switch(state) {
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/* Unlocked due to conversion deadlock, try again */
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case LM_ST_UNLOCKED:
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retry:
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do_xmote(gl, gh, gl->gl_target);
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break;
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/* Conversion fails, unlock and try again */
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case LM_ST_SHARED:
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case LM_ST_DEFERRED:
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do_xmote(gl, gh, LM_ST_UNLOCKED);
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break;
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default: /* Everything else */
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pr_err("wanted %u got %u\n", gl->gl_target, state);
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GLOCK_BUG_ON(gl, 1);
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}
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spin_unlock(&gl->gl_lockref.lock);
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return;
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}
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/* Fast path - we got what we asked for */
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if (test_and_clear_bit(GLF_DEMOTE_IN_PROGRESS, &gl->gl_flags))
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gfs2_demote_wake(gl);
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if (state != LM_ST_UNLOCKED) {
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if (glops->go_xmote_bh) {
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spin_unlock(&gl->gl_lockref.lock);
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rv = glops->go_xmote_bh(gl, gh);
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spin_lock(&gl->gl_lockref.lock);
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if (rv) {
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do_error(gl, rv);
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goto out;
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}
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}
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rv = do_promote(gl);
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if (rv == 2)
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goto out_locked;
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}
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out:
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clear_bit(GLF_LOCK, &gl->gl_flags);
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out_locked:
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spin_unlock(&gl->gl_lockref.lock);
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}
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/**
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* do_xmote - Calls the DLM to change the state of a lock
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* @gl: The lock state
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* @gh: The holder (only for promotes)
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* @target: The target lock state
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*
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*/
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static void do_xmote(struct gfs2_glock *gl, struct gfs2_holder *gh, unsigned int target)
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__releases(&gl->gl_lockref.lock)
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__acquires(&gl->gl_lockref.lock)
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{
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const struct gfs2_glock_operations *glops = gl->gl_ops;
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struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
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unsigned int lck_flags = (unsigned int)(gh ? gh->gh_flags : 0);
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int ret;
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lck_flags &= (LM_FLAG_TRY | LM_FLAG_TRY_1CB | LM_FLAG_NOEXP |
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LM_FLAG_PRIORITY);
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GLOCK_BUG_ON(gl, gl->gl_state == target);
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GLOCK_BUG_ON(gl, gl->gl_state == gl->gl_target);
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if ((target == LM_ST_UNLOCKED || target == LM_ST_DEFERRED) &&
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glops->go_inval) {
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set_bit(GLF_INVALIDATE_IN_PROGRESS, &gl->gl_flags);
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do_error(gl, 0); /* Fail queued try locks */
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}
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gl->gl_req = target;
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set_bit(GLF_BLOCKING, &gl->gl_flags);
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if ((gl->gl_req == LM_ST_UNLOCKED) ||
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(gl->gl_state == LM_ST_EXCLUSIVE) ||
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(lck_flags & (LM_FLAG_TRY|LM_FLAG_TRY_1CB)))
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clear_bit(GLF_BLOCKING, &gl->gl_flags);
|
|
spin_unlock(&gl->gl_lockref.lock);
|
|
if (glops->go_sync)
|
|
glops->go_sync(gl);
|
|
if (test_bit(GLF_INVALIDATE_IN_PROGRESS, &gl->gl_flags))
|
|
glops->go_inval(gl, target == LM_ST_DEFERRED ? 0 : DIO_METADATA);
|
|
clear_bit(GLF_INVALIDATE_IN_PROGRESS, &gl->gl_flags);
|
|
|
|
gfs2_glock_hold(gl);
|
|
if (sdp->sd_lockstruct.ls_ops->lm_lock) {
|
|
/* lock_dlm */
|
|
ret = sdp->sd_lockstruct.ls_ops->lm_lock(gl, target, lck_flags);
|
|
if (ret == -EINVAL && gl->gl_target == LM_ST_UNLOCKED &&
|
|
target == LM_ST_UNLOCKED &&
|
|
test_bit(SDF_SKIP_DLM_UNLOCK, &sdp->sd_flags)) {
|
|
finish_xmote(gl, target);
|
|
if (queue_delayed_work(glock_workqueue, &gl->gl_work, 0) == 0)
|
|
gfs2_glock_put(gl);
|
|
}
|
|
else if (ret) {
|
|
pr_err("lm_lock ret %d\n", ret);
|
|
GLOCK_BUG_ON(gl, 1);
|
|
}
|
|
} else { /* lock_nolock */
|
|
finish_xmote(gl, target);
|
|
if (queue_delayed_work(glock_workqueue, &gl->gl_work, 0) == 0)
|
|
gfs2_glock_put(gl);
|
|
}
|
|
|
|
spin_lock(&gl->gl_lockref.lock);
|
|
}
|
|
|
|
/**
|
|
* find_first_holder - find the first "holder" gh
|
|
* @gl: the glock
|
|
*/
|
|
|
|
static inline struct gfs2_holder *find_first_holder(const struct gfs2_glock *gl)
|
|
{
|
|
struct gfs2_holder *gh;
|
|
|
|
if (!list_empty(&gl->gl_holders)) {
|
|
gh = list_entry(gl->gl_holders.next, struct gfs2_holder, gh_list);
|
|
if (test_bit(HIF_HOLDER, &gh->gh_iflags))
|
|
return gh;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* run_queue - do all outstanding tasks related to a glock
|
|
* @gl: The glock in question
|
|
* @nonblock: True if we must not block in run_queue
|
|
*
|
|
*/
|
|
|
|
static void run_queue(struct gfs2_glock *gl, const int nonblock)
|
|
__releases(&gl->gl_lockref.lock)
|
|
__acquires(&gl->gl_lockref.lock)
|
|
{
|
|
struct gfs2_holder *gh = NULL;
|
|
int ret;
|
|
|
|
if (test_and_set_bit(GLF_LOCK, &gl->gl_flags))
|
|
return;
|
|
|
|
GLOCK_BUG_ON(gl, test_bit(GLF_DEMOTE_IN_PROGRESS, &gl->gl_flags));
|
|
|
|
if (test_bit(GLF_DEMOTE, &gl->gl_flags) &&
|
|
gl->gl_demote_state != gl->gl_state) {
|
|
if (find_first_holder(gl))
|
|
goto out_unlock;
|
|
if (nonblock)
|
|
goto out_sched;
|
|
set_bit(GLF_DEMOTE_IN_PROGRESS, &gl->gl_flags);
|
|
GLOCK_BUG_ON(gl, gl->gl_demote_state == LM_ST_EXCLUSIVE);
|
|
gl->gl_target = gl->gl_demote_state;
|
|
} else {
|
|
if (test_bit(GLF_DEMOTE, &gl->gl_flags))
|
|
gfs2_demote_wake(gl);
|
|
ret = do_promote(gl);
|
|
if (ret == 0)
|
|
goto out_unlock;
|
|
if (ret == 2)
|
|
goto out;
|
|
gh = find_first_waiter(gl);
|
|
gl->gl_target = gh->gh_state;
|
|
if (!(gh->gh_flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB)))
|
|
do_error(gl, 0); /* Fail queued try locks */
|
|
}
|
|
do_xmote(gl, gh, gl->gl_target);
|
|
out:
|
|
return;
|
|
|
|
out_sched:
|
|
clear_bit(GLF_LOCK, &gl->gl_flags);
|
|
smp_mb__after_atomic();
|
|
gl->gl_lockref.count++;
|
|
if (queue_delayed_work(glock_workqueue, &gl->gl_work, 0) == 0)
|
|
gl->gl_lockref.count--;
|
|
return;
|
|
|
|
out_unlock:
|
|
clear_bit(GLF_LOCK, &gl->gl_flags);
|
|
smp_mb__after_atomic();
|
|
return;
|
|
}
|
|
|
|
static void delete_work_func(struct work_struct *work)
|
|
{
|
|
struct gfs2_glock *gl = container_of(work, struct gfs2_glock, gl_delete);
|
|
struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
|
|
struct inode *inode;
|
|
u64 no_addr = gl->gl_name.ln_number;
|
|
|
|
/* If someone's using this glock to create a new dinode, the block must
|
|
have been freed by another node, then re-used, in which case our
|
|
iopen callback is too late after the fact. Ignore it. */
|
|
if (test_bit(GLF_INODE_CREATING, &gl->gl_flags))
|
|
goto out;
|
|
|
|
inode = gfs2_lookup_by_inum(sdp, no_addr, NULL, GFS2_BLKST_UNLINKED);
|
|
if (inode && !IS_ERR(inode)) {
|
|
d_prune_aliases(inode);
|
|
iput(inode);
|
|
}
|
|
out:
|
|
gfs2_glock_put(gl);
|
|
}
|
|
|
|
static void glock_work_func(struct work_struct *work)
|
|
{
|
|
unsigned long delay = 0;
|
|
struct gfs2_glock *gl = container_of(work, struct gfs2_glock, gl_work.work);
|
|
int drop_ref = 0;
|
|
|
|
if (test_and_clear_bit(GLF_REPLY_PENDING, &gl->gl_flags)) {
|
|
finish_xmote(gl, gl->gl_reply);
|
|
drop_ref = 1;
|
|
}
|
|
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) {
|
|
unsigned long holdtime, now = jiffies;
|
|
|
|
holdtime = gl->gl_tchange + gl->gl_hold_time;
|
|
if (time_before(now, holdtime))
|
|
delay = holdtime - now;
|
|
|
|
if (!delay) {
|
|
clear_bit(GLF_PENDING_DEMOTE, &gl->gl_flags);
|
|
set_bit(GLF_DEMOTE, &gl->gl_flags);
|
|
}
|
|
}
|
|
run_queue(gl, 0);
|
|
spin_unlock(&gl->gl_lockref.lock);
|
|
if (!delay)
|
|
gfs2_glock_put(gl);
|
|
else {
|
|
if (gl->gl_name.ln_type != LM_TYPE_INODE)
|
|
delay = 0;
|
|
if (queue_delayed_work(glock_workqueue, &gl->gl_work, delay) == 0)
|
|
gfs2_glock_put(gl);
|
|
}
|
|
if (drop_ref)
|
|
gfs2_glock_put(gl);
|
|
}
|
|
|
|
/**
|
|
* gfs2_glock_get() - Get a glock, or create one if one doesn't exist
|
|
* @sdp: The GFS2 superblock
|
|
* @number: the lock number
|
|
* @glops: The glock_operations to use
|
|
* @create: If 0, don't create the glock if it doesn't exist
|
|
* @glp: the glock is returned here
|
|
*
|
|
* This does not lock a glock, just finds/creates structures for one.
|
|
*
|
|
* Returns: errno
|
|
*/
|
|
|
|
int gfs2_glock_get(struct gfs2_sbd *sdp, u64 number,
|
|
const struct gfs2_glock_operations *glops, int create,
|
|
struct gfs2_glock **glp)
|
|
{
|
|
struct super_block *s = sdp->sd_vfs;
|
|
struct lm_lockname name = { .ln_number = number,
|
|
.ln_type = glops->go_type,
|
|
.ln_sbd = sdp };
|
|
struct gfs2_glock *gl, *tmp = NULL;
|
|
struct address_space *mapping;
|
|
struct kmem_cache *cachep;
|
|
int ret, tries = 0;
|
|
|
|
gl = rhashtable_lookup_fast(&gl_hash_table, &name, ht_parms);
|
|
if (gl && !lockref_get_not_dead(&gl->gl_lockref))
|
|
gl = NULL;
|
|
|
|
*glp = gl;
|
|
if (gl)
|
|
return 0;
|
|
if (!create)
|
|
return -ENOENT;
|
|
|
|
if (glops->go_flags & GLOF_ASPACE)
|
|
cachep = gfs2_glock_aspace_cachep;
|
|
else
|
|
cachep = gfs2_glock_cachep;
|
|
gl = kmem_cache_alloc(cachep, GFP_NOFS);
|
|
if (!gl)
|
|
return -ENOMEM;
|
|
|
|
memset(&gl->gl_lksb, 0, sizeof(struct dlm_lksb));
|
|
|
|
if (glops->go_flags & GLOF_LVB) {
|
|
gl->gl_lksb.sb_lvbptr = kzalloc(GFS2_MIN_LVB_SIZE, GFP_NOFS);
|
|
if (!gl->gl_lksb.sb_lvbptr) {
|
|
kmem_cache_free(cachep, gl);
|
|
return -ENOMEM;
|
|
}
|
|
}
|
|
|
|
atomic_inc(&sdp->sd_glock_disposal);
|
|
gl->gl_node.next = NULL;
|
|
gl->gl_flags = 0;
|
|
gl->gl_name = name;
|
|
gl->gl_lockref.count = 1;
|
|
gl->gl_state = LM_ST_UNLOCKED;
|
|
gl->gl_target = LM_ST_UNLOCKED;
|
|
gl->gl_demote_state = LM_ST_EXCLUSIVE;
|
|
gl->gl_ops = glops;
|
|
gl->gl_dstamp = 0;
|
|
preempt_disable();
|
|
/* We use the global stats to estimate the initial per-glock stats */
|
|
gl->gl_stats = this_cpu_ptr(sdp->sd_lkstats)->lkstats[glops->go_type];
|
|
preempt_enable();
|
|
gl->gl_stats.stats[GFS2_LKS_DCOUNT] = 0;
|
|
gl->gl_stats.stats[GFS2_LKS_QCOUNT] = 0;
|
|
gl->gl_tchange = jiffies;
|
|
gl->gl_object = NULL;
|
|
gl->gl_hold_time = GL_GLOCK_DFT_HOLD;
|
|
INIT_DELAYED_WORK(&gl->gl_work, glock_work_func);
|
|
INIT_WORK(&gl->gl_delete, delete_work_func);
|
|
|
|
mapping = gfs2_glock2aspace(gl);
|
|
if (mapping) {
|
|
mapping->a_ops = &gfs2_meta_aops;
|
|
mapping->host = s->s_bdev->bd_inode;
|
|
mapping->flags = 0;
|
|
mapping_set_gfp_mask(mapping, GFP_NOFS);
|
|
mapping->private_data = NULL;
|
|
mapping->writeback_index = 0;
|
|
}
|
|
|
|
again:
|
|
ret = rhashtable_lookup_insert_fast(&gl_hash_table, &gl->gl_node,
|
|
ht_parms);
|
|
if (ret == 0) {
|
|
*glp = gl;
|
|
return 0;
|
|
}
|
|
|
|
if (ret == -EEXIST) {
|
|
ret = 0;
|
|
tmp = rhashtable_lookup_fast(&gl_hash_table, &name, ht_parms);
|
|
if (tmp == NULL || !lockref_get_not_dead(&tmp->gl_lockref)) {
|
|
if (++tries < 100) {
|
|
cond_resched();
|
|
goto again;
|
|
}
|
|
tmp = NULL;
|
|
ret = -ENOMEM;
|
|
}
|
|
} else {
|
|
WARN_ON_ONCE(ret);
|
|
}
|
|
kfree(gl->gl_lksb.sb_lvbptr);
|
|
kmem_cache_free(cachep, gl);
|
|
atomic_dec(&sdp->sd_glock_disposal);
|
|
*glp = tmp;
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* gfs2_holder_init - initialize a struct gfs2_holder in the default way
|
|
* @gl: the glock
|
|
* @state: the state we're requesting
|
|
* @flags: the modifier flags
|
|
* @gh: the holder structure
|
|
*
|
|
*/
|
|
|
|
void gfs2_holder_init(struct gfs2_glock *gl, unsigned int state, u16 flags,
|
|
struct gfs2_holder *gh)
|
|
{
|
|
INIT_LIST_HEAD(&gh->gh_list);
|
|
gh->gh_gl = gl;
|
|
gh->gh_ip = _RET_IP_;
|
|
gh->gh_owner_pid = get_pid(task_pid(current));
|
|
gh->gh_state = state;
|
|
gh->gh_flags = flags;
|
|
gh->gh_error = 0;
|
|
gh->gh_iflags = 0;
|
|
gfs2_glock_hold(gl);
|
|
}
|
|
|
|
/**
|
|
* gfs2_holder_reinit - reinitialize a struct gfs2_holder so we can requeue it
|
|
* @state: the state we're requesting
|
|
* @flags: the modifier flags
|
|
* @gh: the holder structure
|
|
*
|
|
* Don't mess with the glock.
|
|
*
|
|
*/
|
|
|
|
void gfs2_holder_reinit(unsigned int state, u16 flags, struct gfs2_holder *gh)
|
|
{
|
|
gh->gh_state = state;
|
|
gh->gh_flags = flags;
|
|
gh->gh_iflags = 0;
|
|
gh->gh_ip = _RET_IP_;
|
|
put_pid(gh->gh_owner_pid);
|
|
gh->gh_owner_pid = get_pid(task_pid(current));
|
|
}
|
|
|
|
/**
|
|
* gfs2_holder_uninit - uninitialize a holder structure (drop glock reference)
|
|
* @gh: the holder structure
|
|
*
|
|
*/
|
|
|
|
void gfs2_holder_uninit(struct gfs2_holder *gh)
|
|
{
|
|
put_pid(gh->gh_owner_pid);
|
|
gfs2_glock_put(gh->gh_gl);
|
|
gfs2_holder_mark_uninitialized(gh);
|
|
gh->gh_ip = 0;
|
|
}
|
|
|
|
/**
|
|
* gfs2_glock_wait - wait on a glock acquisition
|
|
* @gh: the glock holder
|
|
*
|
|
* Returns: 0 on success
|
|
*/
|
|
|
|
int gfs2_glock_wait(struct gfs2_holder *gh)
|
|
{
|
|
unsigned long time1 = jiffies;
|
|
|
|
might_sleep();
|
|
wait_on_bit(&gh->gh_iflags, HIF_WAIT, TASK_UNINTERRUPTIBLE);
|
|
if (time_after(jiffies, time1 + HZ)) /* have we waited > a second? */
|
|
/* Lengthen the minimum hold time. */
|
|
gh->gh_gl->gl_hold_time = min(gh->gh_gl->gl_hold_time +
|
|
GL_GLOCK_HOLD_INCR,
|
|
GL_GLOCK_MAX_HOLD);
|
|
return gh->gh_error;
|
|
}
|
|
|
|
/**
|
|
* handle_callback - process a demote request
|
|
* @gl: the glock
|
|
* @state: the state the caller wants us to change to
|
|
*
|
|
* There are only two requests that we are going to see in actual
|
|
* practise: LM_ST_SHARED and LM_ST_UNLOCKED
|
|
*/
|
|
|
|
static void handle_callback(struct gfs2_glock *gl, unsigned int state,
|
|
unsigned long delay, bool remote)
|
|
{
|
|
int bit = delay ? GLF_PENDING_DEMOTE : GLF_DEMOTE;
|
|
|
|
set_bit(bit, &gl->gl_flags);
|
|
if (gl->gl_demote_state == LM_ST_EXCLUSIVE) {
|
|
gl->gl_demote_state = state;
|
|
gl->gl_demote_time = jiffies;
|
|
} else if (gl->gl_demote_state != LM_ST_UNLOCKED &&
|
|
gl->gl_demote_state != state) {
|
|
gl->gl_demote_state = LM_ST_UNLOCKED;
|
|
}
|
|
if (gl->gl_ops->go_callback)
|
|
gl->gl_ops->go_callback(gl, remote);
|
|
trace_gfs2_demote_rq(gl, remote);
|
|
}
|
|
|
|
void gfs2_print_dbg(struct seq_file *seq, const char *fmt, ...)
|
|
{
|
|
struct va_format vaf;
|
|
va_list args;
|
|
|
|
va_start(args, fmt);
|
|
|
|
if (seq) {
|
|
seq_vprintf(seq, fmt, args);
|
|
} else {
|
|
vaf.fmt = fmt;
|
|
vaf.va = &args;
|
|
|
|
pr_err("%pV", &vaf);
|
|
}
|
|
|
|
va_end(args);
|
|
}
|
|
|
|
/**
|
|
* add_to_queue - Add a holder to the wait queue (but look for recursion)
|
|
* @gh: the holder structure to add
|
|
*
|
|
* Eventually we should move the recursive locking trap to a
|
|
* debugging option or something like that. This is the fast
|
|
* path and needs to have the minimum number of distractions.
|
|
*
|
|
*/
|
|
|
|
static inline void add_to_queue(struct gfs2_holder *gh)
|
|
__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;
|
|
struct list_head *insert_pt = NULL;
|
|
struct gfs2_holder *gh2;
|
|
int try_futile = 0;
|
|
|
|
BUG_ON(gh->gh_owner_pid == NULL);
|
|
if (test_and_set_bit(HIF_WAIT, &gh->gh_iflags))
|
|
BUG();
|
|
|
|
if (gh->gh_flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB)) {
|
|
if (test_bit(GLF_LOCK, &gl->gl_flags))
|
|
try_futile = !may_grant(gl, gh);
|
|
if (test_bit(GLF_INVALIDATE_IN_PROGRESS, &gl->gl_flags))
|
|
goto fail;
|
|
}
|
|
|
|
list_for_each_entry(gh2, &gl->gl_holders, gh_list) {
|
|
if (unlikely(gh2->gh_owner_pid == gh->gh_owner_pid &&
|
|
(gh->gh_gl->gl_ops->go_type != LM_TYPE_FLOCK)))
|
|
goto trap_recursive;
|
|
if (try_futile &&
|
|
!(gh2->gh_flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB))) {
|
|
fail:
|
|
gh->gh_error = GLR_TRYFAILED;
|
|
gfs2_holder_wake(gh);
|
|
return;
|
|
}
|
|
if (test_bit(HIF_HOLDER, &gh2->gh_iflags))
|
|
continue;
|
|
if (unlikely((gh->gh_flags & LM_FLAG_PRIORITY) && !insert_pt))
|
|
insert_pt = &gh2->gh_list;
|
|
}
|
|
set_bit(GLF_QUEUED, &gl->gl_flags);
|
|
trace_gfs2_glock_queue(gh, 1);
|
|
gfs2_glstats_inc(gl, GFS2_LKS_QCOUNT);
|
|
gfs2_sbstats_inc(gl, GFS2_LKS_QCOUNT);
|
|
if (likely(insert_pt == NULL)) {
|
|
list_add_tail(&gh->gh_list, &gl->gl_holders);
|
|
if (unlikely(gh->gh_flags & LM_FLAG_PRIORITY))
|
|
goto do_cancel;
|
|
return;
|
|
}
|
|
list_add_tail(&gh->gh_list, insert_pt);
|
|
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_lockref.lock);
|
|
if (sdp->sd_lockstruct.ls_ops->lm_cancel)
|
|
sdp->sd_lockstruct.ls_ops->lm_cancel(gl);
|
|
spin_lock(&gl->gl_lockref.lock);
|
|
}
|
|
return;
|
|
|
|
trap_recursive:
|
|
pr_err("original: %pSR\n", (void *)gh2->gh_ip);
|
|
pr_err("pid: %d\n", pid_nr(gh2->gh_owner_pid));
|
|
pr_err("lock type: %d req lock state : %d\n",
|
|
gh2->gh_gl->gl_name.ln_type, gh2->gh_state);
|
|
pr_err("new: %pSR\n", (void *)gh->gh_ip);
|
|
pr_err("pid: %d\n", pid_nr(gh->gh_owner_pid));
|
|
pr_err("lock type: %d req lock state : %d\n",
|
|
gh->gh_gl->gl_name.ln_type, gh->gh_state);
|
|
gfs2_dump_glock(NULL, gl);
|
|
BUG();
|
|
}
|
|
|
|
/**
|
|
* gfs2_glock_nq - enqueue a struct gfs2_holder onto a glock (acquire a glock)
|
|
* @gh: the holder structure
|
|
*
|
|
* if (gh->gh_flags & GL_ASYNC), this never returns an error
|
|
*
|
|
* Returns: 0, GLR_TRYFAILED, or errno on failure
|
|
*/
|
|
|
|
int gfs2_glock_nq(struct gfs2_holder *gh)
|
|
{
|
|
struct gfs2_glock *gl = gh->gh_gl;
|
|
struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
|
|
int error = 0;
|
|
|
|
if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
|
|
return -EIO;
|
|
|
|
if (test_bit(GLF_LRU, &gl->gl_flags))
|
|
gfs2_glock_remove_from_lru(gl);
|
|
|
|
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))) {
|
|
set_bit(GLF_REPLY_PENDING, &gl->gl_flags);
|
|
gl->gl_lockref.count++;
|
|
if (queue_delayed_work(glock_workqueue, &gl->gl_work, 0) == 0)
|
|
gl->gl_lockref.count--;
|
|
}
|
|
run_queue(gl, 1);
|
|
spin_unlock(&gl->gl_lockref.lock);
|
|
|
|
if (!(gh->gh_flags & GL_ASYNC))
|
|
error = gfs2_glock_wait(gh);
|
|
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* gfs2_glock_poll - poll to see if an async request has been completed
|
|
* @gh: the holder
|
|
*
|
|
* Returns: 1 if the request is ready to be gfs2_glock_wait()ed on
|
|
*/
|
|
|
|
int gfs2_glock_poll(struct gfs2_holder *gh)
|
|
{
|
|
return test_bit(HIF_WAIT, &gh->gh_iflags) ? 0 : 1;
|
|
}
|
|
|
|
/**
|
|
* gfs2_glock_dq - dequeue a struct gfs2_holder from a glock (release a glock)
|
|
* @gh: the glock holder
|
|
*
|
|
*/
|
|
|
|
void gfs2_glock_dq(struct gfs2_holder *gh)
|
|
{
|
|
struct gfs2_glock *gl = gh->gh_gl;
|
|
const struct gfs2_glock_operations *glops = gl->gl_ops;
|
|
unsigned delay = 0;
|
|
int fast_path = 0;
|
|
|
|
spin_lock(&gl->gl_lockref.lock);
|
|
if (gh->gh_flags & GL_NOCACHE)
|
|
handle_callback(gl, LM_ST_UNLOCKED, 0, false);
|
|
|
|
list_del_init(&gh->gh_list);
|
|
clear_bit(HIF_HOLDER, &gh->gh_iflags);
|
|
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_lockref.lock);
|
|
glops->go_unlock(gh);
|
|
spin_lock(&gl->gl_lockref.lock);
|
|
clear_bit(GLF_LOCK, &gl->gl_flags);
|
|
}
|
|
if (list_empty(&gl->gl_holders) &&
|
|
!test_bit(GLF_PENDING_DEMOTE, &gl->gl_flags) &&
|
|
!test_bit(GLF_DEMOTE, &gl->gl_flags))
|
|
fast_path = 1;
|
|
}
|
|
if (!test_bit(GLF_LFLUSH, &gl->gl_flags) && demote_ok(gl) &&
|
|
(glops->go_flags & GLOF_LRU))
|
|
gfs2_glock_add_to_lru(gl);
|
|
|
|
trace_gfs2_glock_queue(gh, 0);
|
|
spin_unlock(&gl->gl_lockref.lock);
|
|
if (likely(fast_path))
|
|
return;
|
|
|
|
gfs2_glock_hold(gl);
|
|
if (test_bit(GLF_PENDING_DEMOTE, &gl->gl_flags) &&
|
|
!test_bit(GLF_DEMOTE, &gl->gl_flags) &&
|
|
gl->gl_name.ln_type == LM_TYPE_INODE)
|
|
delay = gl->gl_hold_time;
|
|
if (queue_delayed_work(glock_workqueue, &gl->gl_work, delay) == 0)
|
|
gfs2_glock_put(gl);
|
|
}
|
|
|
|
void gfs2_glock_dq_wait(struct gfs2_holder *gh)
|
|
{
|
|
struct gfs2_glock *gl = gh->gh_gl;
|
|
gfs2_glock_dq(gh);
|
|
might_sleep();
|
|
wait_on_bit(&gl->gl_flags, GLF_DEMOTE, TASK_UNINTERRUPTIBLE);
|
|
}
|
|
|
|
/**
|
|
* gfs2_glock_dq_uninit - dequeue a holder from a glock and initialize it
|
|
* @gh: the holder structure
|
|
*
|
|
*/
|
|
|
|
void gfs2_glock_dq_uninit(struct gfs2_holder *gh)
|
|
{
|
|
gfs2_glock_dq(gh);
|
|
gfs2_holder_uninit(gh);
|
|
}
|
|
|
|
/**
|
|
* gfs2_glock_nq_num - acquire a glock based on lock number
|
|
* @sdp: the filesystem
|
|
* @number: the lock number
|
|
* @glops: the glock operations for the type of glock
|
|
* @state: the state to acquire the glock in
|
|
* @flags: modifier flags for the acquisition
|
|
* @gh: the struct gfs2_holder
|
|
*
|
|
* Returns: errno
|
|
*/
|
|
|
|
int gfs2_glock_nq_num(struct gfs2_sbd *sdp, u64 number,
|
|
const struct gfs2_glock_operations *glops,
|
|
unsigned int state, u16 flags, struct gfs2_holder *gh)
|
|
{
|
|
struct gfs2_glock *gl;
|
|
int error;
|
|
|
|
error = gfs2_glock_get(sdp, number, glops, CREATE, &gl);
|
|
if (!error) {
|
|
error = gfs2_glock_nq_init(gl, state, flags, gh);
|
|
gfs2_glock_put(gl);
|
|
}
|
|
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* glock_compare - Compare two struct gfs2_glock structures for sorting
|
|
* @arg_a: the first structure
|
|
* @arg_b: the second structure
|
|
*
|
|
*/
|
|
|
|
static int glock_compare(const void *arg_a, const void *arg_b)
|
|
{
|
|
const struct gfs2_holder *gh_a = *(const struct gfs2_holder **)arg_a;
|
|
const struct gfs2_holder *gh_b = *(const struct gfs2_holder **)arg_b;
|
|
const struct lm_lockname *a = &gh_a->gh_gl->gl_name;
|
|
const struct lm_lockname *b = &gh_b->gh_gl->gl_name;
|
|
|
|
if (a->ln_number > b->ln_number)
|
|
return 1;
|
|
if (a->ln_number < b->ln_number)
|
|
return -1;
|
|
BUG_ON(gh_a->gh_gl->gl_ops->go_type == gh_b->gh_gl->gl_ops->go_type);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* nq_m_sync - synchonously acquire more than one glock in deadlock free order
|
|
* @num_gh: the number of structures
|
|
* @ghs: an array of struct gfs2_holder structures
|
|
*
|
|
* Returns: 0 on success (all glocks acquired),
|
|
* errno on failure (no glocks acquired)
|
|
*/
|
|
|
|
static int nq_m_sync(unsigned int num_gh, struct gfs2_holder *ghs,
|
|
struct gfs2_holder **p)
|
|
{
|
|
unsigned int x;
|
|
int error = 0;
|
|
|
|
for (x = 0; x < num_gh; x++)
|
|
p[x] = &ghs[x];
|
|
|
|
sort(p, num_gh, sizeof(struct gfs2_holder *), glock_compare, NULL);
|
|
|
|
for (x = 0; x < num_gh; x++) {
|
|
p[x]->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC);
|
|
|
|
error = gfs2_glock_nq(p[x]);
|
|
if (error) {
|
|
while (x--)
|
|
gfs2_glock_dq(p[x]);
|
|
break;
|
|
}
|
|
}
|
|
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* gfs2_glock_nq_m - acquire multiple glocks
|
|
* @num_gh: the number of structures
|
|
* @ghs: an array of struct gfs2_holder structures
|
|
*
|
|
*
|
|
* Returns: 0 on success (all glocks acquired),
|
|
* errno on failure (no glocks acquired)
|
|
*/
|
|
|
|
int gfs2_glock_nq_m(unsigned int num_gh, struct gfs2_holder *ghs)
|
|
{
|
|
struct gfs2_holder *tmp[4];
|
|
struct gfs2_holder **pph = tmp;
|
|
int error = 0;
|
|
|
|
switch(num_gh) {
|
|
case 0:
|
|
return 0;
|
|
case 1:
|
|
ghs->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC);
|
|
return gfs2_glock_nq(ghs);
|
|
default:
|
|
if (num_gh <= 4)
|
|
break;
|
|
pph = kmalloc(num_gh * sizeof(struct gfs2_holder *), GFP_NOFS);
|
|
if (!pph)
|
|
return -ENOMEM;
|
|
}
|
|
|
|
error = nq_m_sync(num_gh, ghs, pph);
|
|
|
|
if (pph != tmp)
|
|
kfree(pph);
|
|
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* gfs2_glock_dq_m - release multiple glocks
|
|
* @num_gh: the number of structures
|
|
* @ghs: an array of struct gfs2_holder structures
|
|
*
|
|
*/
|
|
|
|
void gfs2_glock_dq_m(unsigned int num_gh, struct gfs2_holder *ghs)
|
|
{
|
|
while (num_gh--)
|
|
gfs2_glock_dq(&ghs[num_gh]);
|
|
}
|
|
|
|
void gfs2_glock_cb(struct gfs2_glock *gl, unsigned int state)
|
|
{
|
|
unsigned long delay = 0;
|
|
unsigned long holdtime;
|
|
unsigned long now = jiffies;
|
|
|
|
gfs2_glock_hold(gl);
|
|
holdtime = gl->gl_tchange + gl->gl_hold_time;
|
|
if (test_bit(GLF_QUEUED, &gl->gl_flags) &&
|
|
gl->gl_name.ln_type == LM_TYPE_INODE) {
|
|
if (time_before(now, holdtime))
|
|
delay = holdtime - now;
|
|
if (test_bit(GLF_REPLY_PENDING, &gl->gl_flags))
|
|
delay = gl->gl_hold_time;
|
|
}
|
|
|
|
spin_lock(&gl->gl_lockref.lock);
|
|
handle_callback(gl, state, delay, true);
|
|
spin_unlock(&gl->gl_lockref.lock);
|
|
if (queue_delayed_work(glock_workqueue, &gl->gl_work, delay) == 0)
|
|
gfs2_glock_put(gl);
|
|
}
|
|
|
|
/**
|
|
* gfs2_should_freeze - Figure out if glock should be frozen
|
|
* @gl: The glock in question
|
|
*
|
|
* Glocks are not frozen if (a) the result of the dlm operation is
|
|
* an error, (b) the locking operation was an unlock operation or
|
|
* (c) if there is a "noexp" flagged request anywhere in the queue
|
|
*
|
|
* Returns: 1 if freezing should occur, 0 otherwise
|
|
*/
|
|
|
|
static int gfs2_should_freeze(const struct gfs2_glock *gl)
|
|
{
|
|
const struct gfs2_holder *gh;
|
|
|
|
if (gl->gl_reply & ~LM_OUT_ST_MASK)
|
|
return 0;
|
|
if (gl->gl_target == LM_ST_UNLOCKED)
|
|
return 0;
|
|
|
|
list_for_each_entry(gh, &gl->gl_holders, gh_list) {
|
|
if (test_bit(HIF_HOLDER, &gh->gh_iflags))
|
|
continue;
|
|
if (LM_FLAG_NOEXP & gh->gh_flags)
|
|
return 0;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
/**
|
|
* gfs2_glock_complete - Callback used by locking
|
|
* @gl: Pointer to the glock
|
|
* @ret: The return value from the dlm
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
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_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_lockref.lock);
|
|
return;
|
|
}
|
|
}
|
|
|
|
gl->gl_lockref.count++;
|
|
set_bit(GLF_REPLY_PENDING, &gl->gl_flags);
|
|
spin_unlock(&gl->gl_lockref.lock);
|
|
|
|
if (queue_delayed_work(glock_workqueue, &gl->gl_work, 0) == 0)
|
|
gfs2_glock_put(gl);
|
|
}
|
|
|
|
static int glock_cmp(void *priv, struct list_head *a, struct list_head *b)
|
|
{
|
|
struct gfs2_glock *gla, *glb;
|
|
|
|
gla = list_entry(a, struct gfs2_glock, gl_lru);
|
|
glb = list_entry(b, struct gfs2_glock, gl_lru);
|
|
|
|
if (gla->gl_name.ln_number > glb->gl_name.ln_number)
|
|
return 1;
|
|
if (gla->gl_name.ln_number < glb->gl_name.ln_number)
|
|
return -1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* gfs2_dispose_glock_lru - Demote a list of glocks
|
|
* @list: The list to dispose of
|
|
*
|
|
* Disposing of glocks may involve disk accesses, so that here we sort
|
|
* the glocks by number (i.e. disk location of the inodes) so that if
|
|
* there are any such accesses, they'll be sent in order (mostly).
|
|
*
|
|
* Must be called under the lru_lock, but may drop and retake this
|
|
* lock. While the lru_lock is dropped, entries may vanish from the
|
|
* list, but no new entries will appear on the list (since it is
|
|
* private)
|
|
*/
|
|
|
|
static void gfs2_dispose_glock_lru(struct list_head *list)
|
|
__releases(&lru_lock)
|
|
__acquires(&lru_lock)
|
|
{
|
|
struct gfs2_glock *gl;
|
|
|
|
list_sort(NULL, list, glock_cmp);
|
|
|
|
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_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_lockref.lock);
|
|
goto add_back_to_lru;
|
|
}
|
|
clear_bit(GLF_LRU, &gl->gl_flags);
|
|
gl->gl_lockref.count++;
|
|
if (demote_ok(gl))
|
|
handle_callback(gl, LM_ST_UNLOCKED, 0, false);
|
|
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_lockref.lock);
|
|
cond_resched_lock(&lru_lock);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gfs2_scan_glock_lru - Scan the LRU looking for locks to demote
|
|
* @nr: The number of entries to scan
|
|
*
|
|
* This function selects the entries on the LRU which are able to
|
|
* be demoted, and then kicks off the process by calling
|
|
* gfs2_dispose_glock_lru() above.
|
|
*/
|
|
|
|
static long gfs2_scan_glock_lru(int nr)
|
|
{
|
|
struct gfs2_glock *gl;
|
|
LIST_HEAD(skipped);
|
|
LIST_HEAD(dispose);
|
|
long freed = 0;
|
|
|
|
spin_lock(&lru_lock);
|
|
while ((nr-- >= 0) && !list_empty(&lru_list)) {
|
|
gl = list_entry(lru_list.next, struct gfs2_glock, gl_lru);
|
|
|
|
/* Test for being demotable */
|
|
if (!test_bit(GLF_LOCK, &gl->gl_flags)) {
|
|
list_move(&gl->gl_lru, &dispose);
|
|
atomic_dec(&lru_count);
|
|
freed++;
|
|
continue;
|
|
}
|
|
|
|
list_move(&gl->gl_lru, &skipped);
|
|
}
|
|
list_splice(&skipped, &lru_list);
|
|
if (!list_empty(&dispose))
|
|
gfs2_dispose_glock_lru(&dispose);
|
|
spin_unlock(&lru_lock);
|
|
|
|
return freed;
|
|
}
|
|
|
|
static unsigned long gfs2_glock_shrink_scan(struct shrinker *shrink,
|
|
struct shrink_control *sc)
|
|
{
|
|
if (!(sc->gfp_mask & __GFP_FS))
|
|
return SHRINK_STOP;
|
|
return gfs2_scan_glock_lru(sc->nr_to_scan);
|
|
}
|
|
|
|
static unsigned long gfs2_glock_shrink_count(struct shrinker *shrink,
|
|
struct shrink_control *sc)
|
|
{
|
|
return vfs_pressure_ratio(atomic_read(&lru_count));
|
|
}
|
|
|
|
static struct shrinker glock_shrinker = {
|
|
.seeks = DEFAULT_SEEKS,
|
|
.count_objects = gfs2_glock_shrink_count,
|
|
.scan_objects = gfs2_glock_shrink_scan,
|
|
};
|
|
|
|
/**
|
|
* examine_bucket - Call a function for glock in a hash bucket
|
|
* @examiner: the function
|
|
* @sdp: the filesystem
|
|
* @bucket: the bucket
|
|
*
|
|
*/
|
|
|
|
static void glock_hash_walk(glock_examiner examiner, const struct gfs2_sbd *sdp)
|
|
{
|
|
struct gfs2_glock *gl;
|
|
struct rhash_head *pos;
|
|
const struct bucket_table *tbl;
|
|
int i;
|
|
|
|
rcu_read_lock();
|
|
tbl = rht_dereference_rcu(gl_hash_table.tbl, &gl_hash_table);
|
|
for (i = 0; i < tbl->size; i++) {
|
|
rht_for_each_entry_rcu(gl, pos, tbl, i, gl_node) {
|
|
if ((gl->gl_name.ln_sbd == sdp) &&
|
|
lockref_get_not_dead(&gl->gl_lockref))
|
|
examiner(gl);
|
|
}
|
|
}
|
|
rcu_read_unlock();
|
|
cond_resched();
|
|
}
|
|
|
|
/**
|
|
* thaw_glock - thaw out a glock which has an unprocessed reply waiting
|
|
* @gl: The glock to thaw
|
|
*
|
|
*/
|
|
|
|
static void thaw_glock(struct gfs2_glock *gl)
|
|
{
|
|
if (!test_and_clear_bit(GLF_FROZEN, &gl->gl_flags))
|
|
goto out;
|
|
set_bit(GLF_REPLY_PENDING, &gl->gl_flags);
|
|
if (queue_delayed_work(glock_workqueue, &gl->gl_work, 0) == 0) {
|
|
out:
|
|
gfs2_glock_put(gl);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* clear_glock - look at a glock and see if we can free it from glock cache
|
|
* @gl: the glock to look at
|
|
*
|
|
*/
|
|
|
|
static void clear_glock(struct gfs2_glock *gl)
|
|
{
|
|
gfs2_glock_remove_from_lru(gl);
|
|
|
|
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_lockref.lock);
|
|
if (queue_delayed_work(glock_workqueue, &gl->gl_work, 0) == 0)
|
|
gfs2_glock_put(gl);
|
|
}
|
|
|
|
/**
|
|
* gfs2_glock_thaw - Thaw any frozen glocks
|
|
* @sdp: The super block
|
|
*
|
|
*/
|
|
|
|
void gfs2_glock_thaw(struct gfs2_sbd *sdp)
|
|
{
|
|
glock_hash_walk(thaw_glock, sdp);
|
|
}
|
|
|
|
static void dump_glock(struct seq_file *seq, struct gfs2_glock *gl)
|
|
{
|
|
spin_lock(&gl->gl_lockref.lock);
|
|
gfs2_dump_glock(seq, gl);
|
|
spin_unlock(&gl->gl_lockref.lock);
|
|
}
|
|
|
|
static void dump_glock_func(struct gfs2_glock *gl)
|
|
{
|
|
dump_glock(NULL, gl);
|
|
}
|
|
|
|
/**
|
|
* gfs2_gl_hash_clear - Empty out the glock hash table
|
|
* @sdp: the filesystem
|
|
* @wait: wait until it's all gone
|
|
*
|
|
* Called when unmounting the filesystem.
|
|
*/
|
|
|
|
void gfs2_gl_hash_clear(struct gfs2_sbd *sdp)
|
|
{
|
|
set_bit(SDF_SKIP_DLM_UNLOCK, &sdp->sd_flags);
|
|
flush_workqueue(glock_workqueue);
|
|
glock_hash_walk(clear_glock, sdp);
|
|
flush_workqueue(glock_workqueue);
|
|
wait_event_timeout(sdp->sd_glock_wait,
|
|
atomic_read(&sdp->sd_glock_disposal) == 0,
|
|
HZ * 600);
|
|
glock_hash_walk(dump_glock_func, sdp);
|
|
}
|
|
|
|
void gfs2_glock_finish_truncate(struct gfs2_inode *ip)
|
|
{
|
|
struct gfs2_glock *gl = ip->i_gl;
|
|
int ret;
|
|
|
|
ret = gfs2_truncatei_resume(ip);
|
|
gfs2_assert_withdraw(gl->gl_name.ln_sbd, ret == 0);
|
|
|
|
spin_lock(&gl->gl_lockref.lock);
|
|
clear_bit(GLF_LOCK, &gl->gl_flags);
|
|
run_queue(gl, 1);
|
|
spin_unlock(&gl->gl_lockref.lock);
|
|
}
|
|
|
|
static const char *state2str(unsigned state)
|
|
{
|
|
switch(state) {
|
|
case LM_ST_UNLOCKED:
|
|
return "UN";
|
|
case LM_ST_SHARED:
|
|
return "SH";
|
|
case LM_ST_DEFERRED:
|
|
return "DF";
|
|
case LM_ST_EXCLUSIVE:
|
|
return "EX";
|
|
}
|
|
return "??";
|
|
}
|
|
|
|
static const char *hflags2str(char *buf, u16 flags, unsigned long iflags)
|
|
{
|
|
char *p = buf;
|
|
if (flags & LM_FLAG_TRY)
|
|
*p++ = 't';
|
|
if (flags & LM_FLAG_TRY_1CB)
|
|
*p++ = 'T';
|
|
if (flags & LM_FLAG_NOEXP)
|
|
*p++ = 'e';
|
|
if (flags & LM_FLAG_ANY)
|
|
*p++ = 'A';
|
|
if (flags & LM_FLAG_PRIORITY)
|
|
*p++ = 'p';
|
|
if (flags & GL_ASYNC)
|
|
*p++ = 'a';
|
|
if (flags & GL_EXACT)
|
|
*p++ = 'E';
|
|
if (flags & GL_NOCACHE)
|
|
*p++ = 'c';
|
|
if (test_bit(HIF_HOLDER, &iflags))
|
|
*p++ = 'H';
|
|
if (test_bit(HIF_WAIT, &iflags))
|
|
*p++ = 'W';
|
|
if (test_bit(HIF_FIRST, &iflags))
|
|
*p++ = 'F';
|
|
*p = 0;
|
|
return buf;
|
|
}
|
|
|
|
/**
|
|
* dump_holder - print information about a glock holder
|
|
* @seq: the seq_file struct
|
|
* @gh: the glock holder
|
|
*
|
|
*/
|
|
|
|
static void dump_holder(struct seq_file *seq, const struct gfs2_holder *gh)
|
|
{
|
|
struct task_struct *gh_owner = NULL;
|
|
char flags_buf[32];
|
|
|
|
rcu_read_lock();
|
|
if (gh->gh_owner_pid)
|
|
gh_owner = pid_task(gh->gh_owner_pid, PIDTYPE_PID);
|
|
gfs2_print_dbg(seq, " H: s:%s f:%s e:%d p:%ld [%s] %pS\n",
|
|
state2str(gh->gh_state),
|
|
hflags2str(flags_buf, gh->gh_flags, gh->gh_iflags),
|
|
gh->gh_error,
|
|
gh->gh_owner_pid ? (long)pid_nr(gh->gh_owner_pid) : -1,
|
|
gh_owner ? gh_owner->comm : "(ended)",
|
|
(void *)gh->gh_ip);
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
static const char *gflags2str(char *buf, const struct gfs2_glock *gl)
|
|
{
|
|
const unsigned long *gflags = &gl->gl_flags;
|
|
char *p = buf;
|
|
|
|
if (test_bit(GLF_LOCK, gflags))
|
|
*p++ = 'l';
|
|
if (test_bit(GLF_DEMOTE, gflags))
|
|
*p++ = 'D';
|
|
if (test_bit(GLF_PENDING_DEMOTE, gflags))
|
|
*p++ = 'd';
|
|
if (test_bit(GLF_DEMOTE_IN_PROGRESS, gflags))
|
|
*p++ = 'p';
|
|
if (test_bit(GLF_DIRTY, gflags))
|
|
*p++ = 'y';
|
|
if (test_bit(GLF_LFLUSH, gflags))
|
|
*p++ = 'f';
|
|
if (test_bit(GLF_INVALIDATE_IN_PROGRESS, 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';
|
|
if (test_bit(GLF_QUEUED, gflags))
|
|
*p++ = 'q';
|
|
if (test_bit(GLF_LRU, gflags))
|
|
*p++ = 'L';
|
|
if (gl->gl_object)
|
|
*p++ = 'o';
|
|
if (test_bit(GLF_BLOCKING, gflags))
|
|
*p++ = 'b';
|
|
*p = 0;
|
|
return buf;
|
|
}
|
|
|
|
/**
|
|
* gfs2_dump_glock - print information about a glock
|
|
* @seq: The seq_file struct
|
|
* @gl: the glock
|
|
*
|
|
* The file format is as follows:
|
|
* One line per object, capital letters are used to indicate objects
|
|
* G = glock, I = Inode, R = rgrp, H = holder. Glocks are not indented,
|
|
* other objects are indented by a single space and follow the glock to
|
|
* which they are related. Fields are indicated by lower case letters
|
|
* followed by a colon and the field value, except for strings which are in
|
|
* [] so that its possible to see if they are composed of spaces for
|
|
* example. The field's are n = number (id of the object), f = flags,
|
|
* t = type, s = state, r = refcount, e = error, p = pid.
|
|
*
|
|
*/
|
|
|
|
void gfs2_dump_glock(struct seq_file *seq, const struct gfs2_glock *gl)
|
|
{
|
|
const struct gfs2_glock_operations *glops = gl->gl_ops;
|
|
unsigned long long dtime;
|
|
const struct gfs2_holder *gh;
|
|
char gflags_buf[32];
|
|
|
|
dtime = jiffies - gl->gl_demote_time;
|
|
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/%llx f:%s t:%s d:%s/%llu a:%d v:%d r:%d m:%ld\n",
|
|
state2str(gl->gl_state),
|
|
gl->gl_name.ln_type,
|
|
(unsigned long long)gl->gl_name.ln_number,
|
|
gflags2str(gflags_buf, gl),
|
|
state2str(gl->gl_target),
|
|
state2str(gl->gl_demote_state), dtime,
|
|
atomic_read(&gl->gl_ail_count),
|
|
atomic_read(&gl->gl_revokes),
|
|
(int)gl->gl_lockref.count, gl->gl_hold_time);
|
|
|
|
list_for_each_entry(gh, &gl->gl_holders, gh_list)
|
|
dump_holder(seq, gh);
|
|
|
|
if (gl->gl_state != LM_ST_UNLOCKED && glops->go_dump)
|
|
glops->go_dump(seq, gl);
|
|
}
|
|
|
|
static int gfs2_glstats_seq_show(struct seq_file *seq, void *iter_ptr)
|
|
{
|
|
struct gfs2_glock *gl = iter_ptr;
|
|
|
|
seq_printf(seq, "G: n:%u/%llx rtt:%llu/%llu rttb:%llu/%llu irt:%llu/%llu dcnt: %llu qcnt: %llu\n",
|
|
gl->gl_name.ln_type,
|
|
(unsigned long long)gl->gl_name.ln_number,
|
|
(unsigned long long)gl->gl_stats.stats[GFS2_LKS_SRTT],
|
|
(unsigned long long)gl->gl_stats.stats[GFS2_LKS_SRTTVAR],
|
|
(unsigned long long)gl->gl_stats.stats[GFS2_LKS_SRTTB],
|
|
(unsigned long long)gl->gl_stats.stats[GFS2_LKS_SRTTVARB],
|
|
(unsigned long long)gl->gl_stats.stats[GFS2_LKS_SIRT],
|
|
(unsigned long long)gl->gl_stats.stats[GFS2_LKS_SIRTVAR],
|
|
(unsigned long long)gl->gl_stats.stats[GFS2_LKS_DCOUNT],
|
|
(unsigned long long)gl->gl_stats.stats[GFS2_LKS_QCOUNT]);
|
|
return 0;
|
|
}
|
|
|
|
static const char *gfs2_gltype[] = {
|
|
"type",
|
|
"reserved",
|
|
"nondisk",
|
|
"inode",
|
|
"rgrp",
|
|
"meta",
|
|
"iopen",
|
|
"flock",
|
|
"plock",
|
|
"quota",
|
|
"journal",
|
|
};
|
|
|
|
static const char *gfs2_stype[] = {
|
|
[GFS2_LKS_SRTT] = "srtt",
|
|
[GFS2_LKS_SRTTVAR] = "srttvar",
|
|
[GFS2_LKS_SRTTB] = "srttb",
|
|
[GFS2_LKS_SRTTVARB] = "srttvarb",
|
|
[GFS2_LKS_SIRT] = "sirt",
|
|
[GFS2_LKS_SIRTVAR] = "sirtvar",
|
|
[GFS2_LKS_DCOUNT] = "dlm",
|
|
[GFS2_LKS_QCOUNT] = "queue",
|
|
};
|
|
|
|
#define GFS2_NR_SBSTATS (ARRAY_SIZE(gfs2_gltype) * ARRAY_SIZE(gfs2_stype))
|
|
|
|
static int gfs2_sbstats_seq_show(struct seq_file *seq, void *iter_ptr)
|
|
{
|
|
struct gfs2_sbd *sdp = seq->private;
|
|
loff_t pos = *(loff_t *)iter_ptr;
|
|
unsigned index = pos >> 3;
|
|
unsigned subindex = pos & 0x07;
|
|
int i;
|
|
|
|
if (index == 0 && subindex != 0)
|
|
return 0;
|
|
|
|
seq_printf(seq, "%-10s %8s:", gfs2_gltype[index],
|
|
(index == 0) ? "cpu": gfs2_stype[subindex]);
|
|
|
|
for_each_possible_cpu(i) {
|
|
const struct gfs2_pcpu_lkstats *lkstats = per_cpu_ptr(sdp->sd_lkstats, i);
|
|
|
|
if (index == 0)
|
|
seq_printf(seq, " %15u", i);
|
|
else
|
|
seq_printf(seq, " %15llu", (unsigned long long)lkstats->
|
|
lkstats[index - 1].stats[subindex]);
|
|
}
|
|
seq_putc(seq, '\n');
|
|
return 0;
|
|
}
|
|
|
|
int __init gfs2_glock_init(void)
|
|
{
|
|
int ret;
|
|
|
|
ret = rhashtable_init(&gl_hash_table, &ht_parms);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
glock_workqueue = alloc_workqueue("glock_workqueue", WQ_MEM_RECLAIM |
|
|
WQ_HIGHPRI | WQ_FREEZABLE, 0);
|
|
if (!glock_workqueue) {
|
|
rhashtable_destroy(&gl_hash_table);
|
|
return -ENOMEM;
|
|
}
|
|
gfs2_delete_workqueue = alloc_workqueue("delete_workqueue",
|
|
WQ_MEM_RECLAIM | WQ_FREEZABLE,
|
|
0);
|
|
if (!gfs2_delete_workqueue) {
|
|
destroy_workqueue(glock_workqueue);
|
|
rhashtable_destroy(&gl_hash_table);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
ret = register_shrinker(&glock_shrinker);
|
|
if (ret) {
|
|
destroy_workqueue(gfs2_delete_workqueue);
|
|
destroy_workqueue(glock_workqueue);
|
|
rhashtable_destroy(&gl_hash_table);
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
void gfs2_glock_exit(void)
|
|
{
|
|
unregister_shrinker(&glock_shrinker);
|
|
rhashtable_destroy(&gl_hash_table);
|
|
destroy_workqueue(glock_workqueue);
|
|
destroy_workqueue(gfs2_delete_workqueue);
|
|
}
|
|
|
|
static void gfs2_glock_iter_next(struct gfs2_glock_iter *gi)
|
|
{
|
|
do {
|
|
gi->gl = rhashtable_walk_next(&gi->hti);
|
|
if (IS_ERR(gi->gl)) {
|
|
if (PTR_ERR(gi->gl) == -EAGAIN)
|
|
continue;
|
|
gi->gl = NULL;
|
|
}
|
|
/* Skip entries for other sb and dead entries */
|
|
} while ((gi->gl) && ((gi->sdp != gi->gl->gl_name.ln_sbd) ||
|
|
__lockref_is_dead(&gi->gl->gl_lockref)));
|
|
}
|
|
|
|
static void *gfs2_glock_seq_start(struct seq_file *seq, loff_t *pos)
|
|
{
|
|
struct gfs2_glock_iter *gi = seq->private;
|
|
loff_t n = *pos;
|
|
int ret;
|
|
|
|
if (gi->last_pos <= *pos)
|
|
n = (*pos - gi->last_pos);
|
|
|
|
ret = rhashtable_walk_start(&gi->hti);
|
|
if (ret)
|
|
return NULL;
|
|
|
|
do {
|
|
gfs2_glock_iter_next(gi);
|
|
} while (gi->gl && n--);
|
|
|
|
gi->last_pos = *pos;
|
|
return gi->gl;
|
|
}
|
|
|
|
static void *gfs2_glock_seq_next(struct seq_file *seq, void *iter_ptr,
|
|
loff_t *pos)
|
|
{
|
|
struct gfs2_glock_iter *gi = seq->private;
|
|
|
|
(*pos)++;
|
|
gi->last_pos = *pos;
|
|
gfs2_glock_iter_next(gi);
|
|
return gi->gl;
|
|
}
|
|
|
|
static void gfs2_glock_seq_stop(struct seq_file *seq, void *iter_ptr)
|
|
{
|
|
struct gfs2_glock_iter *gi = seq->private;
|
|
|
|
gi->gl = NULL;
|
|
rhashtable_walk_stop(&gi->hti);
|
|
}
|
|
|
|
static int gfs2_glock_seq_show(struct seq_file *seq, void *iter_ptr)
|
|
{
|
|
dump_glock(seq, iter_ptr);
|
|
return 0;
|
|
}
|
|
|
|
static void *gfs2_sbstats_seq_start(struct seq_file *seq, loff_t *pos)
|
|
{
|
|
preempt_disable();
|
|
if (*pos >= GFS2_NR_SBSTATS)
|
|
return NULL;
|
|
return pos;
|
|
}
|
|
|
|
static void *gfs2_sbstats_seq_next(struct seq_file *seq, void *iter_ptr,
|
|
loff_t *pos)
|
|
{
|
|
(*pos)++;
|
|
if (*pos >= GFS2_NR_SBSTATS)
|
|
return NULL;
|
|
return pos;
|
|
}
|
|
|
|
static void gfs2_sbstats_seq_stop(struct seq_file *seq, void *iter_ptr)
|
|
{
|
|
preempt_enable();
|
|
}
|
|
|
|
static const struct seq_operations gfs2_glock_seq_ops = {
|
|
.start = gfs2_glock_seq_start,
|
|
.next = gfs2_glock_seq_next,
|
|
.stop = gfs2_glock_seq_stop,
|
|
.show = gfs2_glock_seq_show,
|
|
};
|
|
|
|
static const struct seq_operations gfs2_glstats_seq_ops = {
|
|
.start = gfs2_glock_seq_start,
|
|
.next = gfs2_glock_seq_next,
|
|
.stop = gfs2_glock_seq_stop,
|
|
.show = gfs2_glstats_seq_show,
|
|
};
|
|
|
|
static const struct seq_operations gfs2_sbstats_seq_ops = {
|
|
.start = gfs2_sbstats_seq_start,
|
|
.next = gfs2_sbstats_seq_next,
|
|
.stop = gfs2_sbstats_seq_stop,
|
|
.show = gfs2_sbstats_seq_show,
|
|
};
|
|
|
|
#define GFS2_SEQ_GOODSIZE min(PAGE_SIZE << PAGE_ALLOC_COSTLY_ORDER, 65536UL)
|
|
|
|
static int gfs2_glocks_open(struct inode *inode, struct file *file)
|
|
{
|
|
int ret = seq_open_private(file, &gfs2_glock_seq_ops,
|
|
sizeof(struct gfs2_glock_iter));
|
|
if (ret == 0) {
|
|
struct seq_file *seq = file->private_data;
|
|
struct gfs2_glock_iter *gi = seq->private;
|
|
|
|
gi->sdp = inode->i_private;
|
|
gi->last_pos = 0;
|
|
seq->buf = kmalloc(GFS2_SEQ_GOODSIZE, GFP_KERNEL | __GFP_NOWARN);
|
|
if (seq->buf)
|
|
seq->size = GFS2_SEQ_GOODSIZE;
|
|
gi->gl = NULL;
|
|
ret = rhashtable_walk_init(&gl_hash_table, &gi->hti, GFP_KERNEL);
|
|
}
|
|
return ret;
|
|
}
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|
|
|
static int gfs2_glocks_release(struct inode *inode, struct file *file)
|
|
{
|
|
struct seq_file *seq = file->private_data;
|
|
struct gfs2_glock_iter *gi = seq->private;
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|
|
|
gi->gl = NULL;
|
|
rhashtable_walk_exit(&gi->hti);
|
|
return seq_release_private(inode, file);
|
|
}
|
|
|
|
static int gfs2_glstats_open(struct inode *inode, struct file *file)
|
|
{
|
|
int ret = seq_open_private(file, &gfs2_glstats_seq_ops,
|
|
sizeof(struct gfs2_glock_iter));
|
|
if (ret == 0) {
|
|
struct seq_file *seq = file->private_data;
|
|
struct gfs2_glock_iter *gi = seq->private;
|
|
gi->sdp = inode->i_private;
|
|
gi->last_pos = 0;
|
|
seq->buf = kmalloc(GFS2_SEQ_GOODSIZE, GFP_KERNEL | __GFP_NOWARN);
|
|
if (seq->buf)
|
|
seq->size = GFS2_SEQ_GOODSIZE;
|
|
gi->gl = NULL;
|
|
ret = rhashtable_walk_init(&gl_hash_table, &gi->hti, GFP_KERNEL);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int gfs2_sbstats_open(struct inode *inode, struct file *file)
|
|
{
|
|
int ret = seq_open(file, &gfs2_sbstats_seq_ops);
|
|
if (ret == 0) {
|
|
struct seq_file *seq = file->private_data;
|
|
seq->private = inode->i_private; /* sdp */
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static const struct file_operations gfs2_glocks_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = gfs2_glocks_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = gfs2_glocks_release,
|
|
};
|
|
|
|
static const struct file_operations gfs2_glstats_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = gfs2_glstats_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = gfs2_glocks_release,
|
|
};
|
|
|
|
static const struct file_operations gfs2_sbstats_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = gfs2_sbstats_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = seq_release,
|
|
};
|
|
|
|
int gfs2_create_debugfs_file(struct gfs2_sbd *sdp)
|
|
{
|
|
struct dentry *dent;
|
|
|
|
dent = debugfs_create_dir(sdp->sd_table_name, gfs2_root);
|
|
if (IS_ERR_OR_NULL(dent))
|
|
goto fail;
|
|
sdp->debugfs_dir = dent;
|
|
|
|
dent = debugfs_create_file("glocks",
|
|
S_IFREG | S_IRUGO,
|
|
sdp->debugfs_dir, sdp,
|
|
&gfs2_glocks_fops);
|
|
if (IS_ERR_OR_NULL(dent))
|
|
goto fail;
|
|
sdp->debugfs_dentry_glocks = dent;
|
|
|
|
dent = debugfs_create_file("glstats",
|
|
S_IFREG | S_IRUGO,
|
|
sdp->debugfs_dir, sdp,
|
|
&gfs2_glstats_fops);
|
|
if (IS_ERR_OR_NULL(dent))
|
|
goto fail;
|
|
sdp->debugfs_dentry_glstats = dent;
|
|
|
|
dent = debugfs_create_file("sbstats",
|
|
S_IFREG | S_IRUGO,
|
|
sdp->debugfs_dir, sdp,
|
|
&gfs2_sbstats_fops);
|
|
if (IS_ERR_OR_NULL(dent))
|
|
goto fail;
|
|
sdp->debugfs_dentry_sbstats = dent;
|
|
|
|
return 0;
|
|
fail:
|
|
gfs2_delete_debugfs_file(sdp);
|
|
return dent ? PTR_ERR(dent) : -ENOMEM;
|
|
}
|
|
|
|
void gfs2_delete_debugfs_file(struct gfs2_sbd *sdp)
|
|
{
|
|
if (sdp->debugfs_dir) {
|
|
if (sdp->debugfs_dentry_glocks) {
|
|
debugfs_remove(sdp->debugfs_dentry_glocks);
|
|
sdp->debugfs_dentry_glocks = NULL;
|
|
}
|
|
if (sdp->debugfs_dentry_glstats) {
|
|
debugfs_remove(sdp->debugfs_dentry_glstats);
|
|
sdp->debugfs_dentry_glstats = NULL;
|
|
}
|
|
if (sdp->debugfs_dentry_sbstats) {
|
|
debugfs_remove(sdp->debugfs_dentry_sbstats);
|
|
sdp->debugfs_dentry_sbstats = NULL;
|
|
}
|
|
debugfs_remove(sdp->debugfs_dir);
|
|
sdp->debugfs_dir = NULL;
|
|
}
|
|
}
|
|
|
|
int gfs2_register_debugfs(void)
|
|
{
|
|
gfs2_root = debugfs_create_dir("gfs2", NULL);
|
|
if (IS_ERR(gfs2_root))
|
|
return PTR_ERR(gfs2_root);
|
|
return gfs2_root ? 0 : -ENOMEM;
|
|
}
|
|
|
|
void gfs2_unregister_debugfs(void)
|
|
{
|
|
debugfs_remove(gfs2_root);
|
|
gfs2_root = NULL;
|
|
}
|