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491 lines
11 KiB
491 lines
11 KiB
/*
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* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
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* Copyright (C) 2004-2006 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 v.2.
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*/
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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/completion.h>
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#include <linux/buffer_head.h>
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#include <linux/gfs2_ondisk.h>
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#include "gfs2.h"
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#include "lm_interface.h"
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#include "incore.h"
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#include "bmap.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 "log.h"
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#include "meta_io.h"
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#include "page.h"
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#include "recovery.h"
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#include "rgrp.h"
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#include "util.h"
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/**
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* meta_go_sync - sync out the metadata for this glock
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* @gl: the glock
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* @flags: DIO_*
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*
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* Called when demoting or unlocking an EX glock. We must flush
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* to disk all dirty buffers/pages relating to this glock, and must not
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* not return to caller to demote/unlock the glock until I/O is complete.
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*/
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static void meta_go_sync(struct gfs2_glock *gl, int flags)
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{
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if (!(flags & DIO_METADATA))
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return;
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if (test_and_clear_bit(GLF_DIRTY, &gl->gl_flags)) {
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gfs2_log_flush(gl->gl_sbd, gl);
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gfs2_meta_sync(gl, flags | DIO_START | DIO_WAIT);
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if (flags & DIO_RELEASE)
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gfs2_ail_empty_gl(gl);
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}
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clear_bit(GLF_SYNC, &gl->gl_flags);
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}
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/**
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* meta_go_inval - invalidate the metadata for this glock
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* @gl: the glock
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* @flags:
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*
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*/
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static void meta_go_inval(struct gfs2_glock *gl, int flags)
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{
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if (!(flags & DIO_METADATA))
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return;
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gfs2_meta_inval(gl);
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gl->gl_vn++;
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}
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/**
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* meta_go_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 we have no cached data; ok to demote meta glock
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*/
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static int meta_go_demote_ok(struct gfs2_glock *gl)
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{
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return !gl->gl_aspace->i_mapping->nrpages;
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}
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/**
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* inode_go_xmote_th - promote/demote a glock
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* @gl: the glock
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* @state: the requested state
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* @flags:
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*
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*/
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static void inode_go_xmote_th(struct gfs2_glock *gl, unsigned int state,
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int flags)
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{
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if (gl->gl_state != LM_ST_UNLOCKED)
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gfs2_pte_inval(gl);
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gfs2_glock_xmote_th(gl, state, flags);
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}
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/**
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* inode_go_xmote_bh - After promoting/demoting a glock
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* @gl: the glock
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*
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*/
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static void inode_go_xmote_bh(struct gfs2_glock *gl)
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{
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struct gfs2_holder *gh = gl->gl_req_gh;
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struct buffer_head *bh;
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int error;
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if (gl->gl_state != LM_ST_UNLOCKED &&
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(!gh || !(gh->gh_flags & GL_SKIP))) {
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error = gfs2_meta_read(gl, gl->gl_name.ln_number, DIO_START,
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&bh);
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if (!error)
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brelse(bh);
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}
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}
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/**
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* inode_go_drop_th - unlock a glock
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* @gl: the glock
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*
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* Invoked from rq_demote().
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* Another node needs the lock in EXCLUSIVE mode, or lock (unused for too long)
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* is being purged from our node's glock cache; we're dropping lock.
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*/
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static void inode_go_drop_th(struct gfs2_glock *gl)
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{
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gfs2_pte_inval(gl);
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gfs2_glock_drop_th(gl);
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}
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/**
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* inode_go_sync - Sync the dirty data and/or metadata for an inode glock
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* @gl: the glock protecting the inode
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* @flags:
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*
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*/
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static void inode_go_sync(struct gfs2_glock *gl, int flags)
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{
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int meta = (flags & DIO_METADATA);
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int data = (flags & DIO_DATA);
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if (test_bit(GLF_DIRTY, &gl->gl_flags)) {
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if (meta && data) {
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gfs2_page_sync(gl, flags | DIO_START);
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gfs2_log_flush(gl->gl_sbd, gl);
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gfs2_meta_sync(gl, flags | DIO_START | DIO_WAIT);
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gfs2_page_sync(gl, flags | DIO_WAIT);
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clear_bit(GLF_DIRTY, &gl->gl_flags);
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} else if (meta) {
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gfs2_log_flush(gl->gl_sbd, gl);
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gfs2_meta_sync(gl, flags | DIO_START | DIO_WAIT);
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} else if (data)
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gfs2_page_sync(gl, flags | DIO_START | DIO_WAIT);
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if (flags & DIO_RELEASE)
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gfs2_ail_empty_gl(gl);
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}
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clear_bit(GLF_SYNC, &gl->gl_flags);
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}
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/**
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* inode_go_inval - prepare a inode glock to be released
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* @gl: the glock
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* @flags:
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*
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*/
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static void inode_go_inval(struct gfs2_glock *gl, int flags)
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{
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int meta = (flags & DIO_METADATA);
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int data = (flags & DIO_DATA);
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if (meta) {
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gfs2_meta_inval(gl);
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gl->gl_vn++;
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}
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if (data)
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gfs2_page_inval(gl);
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}
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/**
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* inode_go_demote_ok - Check to see if it's ok to unlock an inode 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 inode_go_demote_ok(struct gfs2_glock *gl)
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{
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struct gfs2_sbd *sdp = gl->gl_sbd;
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int demote = 0;
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if (!gl->gl_object && !gl->gl_aspace->i_mapping->nrpages)
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demote = 1;
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else if (!sdp->sd_args.ar_localcaching &&
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time_after_eq(jiffies, gl->gl_stamp +
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gfs2_tune_get(sdp, gt_demote_secs) * HZ))
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demote = 1;
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return demote;
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}
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/**
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* inode_go_lock - operation done after an inode lock is locked by a process
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* @gl: the glock
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* @flags:
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*
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* Returns: errno
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*/
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static int inode_go_lock(struct gfs2_holder *gh)
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{
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struct gfs2_glock *gl = gh->gh_gl;
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struct gfs2_inode *ip = gl->gl_object;
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int error = 0;
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if (!ip)
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return 0;
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if (ip->i_vn != gl->gl_vn) {
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error = gfs2_inode_refresh(ip);
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if (error)
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return error;
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gfs2_inode_attr_in(ip);
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}
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if ((ip->i_di.di_flags & GFS2_DIF_TRUNC_IN_PROG) &&
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(gl->gl_state == LM_ST_EXCLUSIVE) &&
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(gh->gh_flags & GL_LOCAL_EXCL))
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error = gfs2_truncatei_resume(ip);
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return error;
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}
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/**
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* inode_go_unlock - operation done before an inode lock is unlocked by a
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* process
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* @gl: the glock
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* @flags:
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*
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*/
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static void inode_go_unlock(struct gfs2_holder *gh)
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{
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struct gfs2_glock *gl = gh->gh_gl;
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struct gfs2_inode *ip = gl->gl_object;
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if (ip && test_bit(GLF_DIRTY, &gl->gl_flags))
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gfs2_inode_attr_in(ip);
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if (ip)
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gfs2_meta_cache_flush(ip);
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}
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/**
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* inode_greedy -
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* @gl: the glock
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*
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*/
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static void inode_greedy(struct gfs2_glock *gl)
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{
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struct gfs2_sbd *sdp = gl->gl_sbd;
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struct gfs2_inode *ip = gl->gl_object;
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unsigned int quantum = gfs2_tune_get(sdp, gt_greedy_quantum);
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unsigned int max = gfs2_tune_get(sdp, gt_greedy_max);
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unsigned int new_time;
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spin_lock(&ip->i_spin);
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if (time_after(ip->i_last_pfault + quantum, jiffies)) {
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new_time = ip->i_greedy + quantum;
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if (new_time > max)
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new_time = max;
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} else {
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new_time = ip->i_greedy - quantum;
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if (!new_time || new_time > max)
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new_time = 1;
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}
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ip->i_greedy = new_time;
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spin_unlock(&ip->i_spin);
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gfs2_inode_put(ip);
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}
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/**
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* rgrp_go_demote_ok - Check to see if it's ok to unlock a RG's 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 rgrp_go_demote_ok(struct gfs2_glock *gl)
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{
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return !gl->gl_aspace->i_mapping->nrpages;
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}
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/**
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* rgrp_go_lock - operation done after an rgrp lock is locked by
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* a first holder on this node.
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* @gl: the glock
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* @flags:
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*
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* Returns: errno
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*/
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static int rgrp_go_lock(struct gfs2_holder *gh)
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{
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return gfs2_rgrp_bh_get(gh->gh_gl->gl_object);
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}
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/**
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* rgrp_go_unlock - operation done before an rgrp lock is unlocked by
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* a last holder on this node.
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* @gl: the glock
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* @flags:
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*
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*/
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static void rgrp_go_unlock(struct gfs2_holder *gh)
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{
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gfs2_rgrp_bh_put(gh->gh_gl->gl_object);
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}
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/**
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* trans_go_xmote_th - promote/demote the transaction glock
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* @gl: the glock
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* @state: the requested state
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* @flags:
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*
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*/
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static void trans_go_xmote_th(struct gfs2_glock *gl, unsigned int state,
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int flags)
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{
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struct gfs2_sbd *sdp = gl->gl_sbd;
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if (gl->gl_state != LM_ST_UNLOCKED &&
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test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
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gfs2_meta_syncfs(sdp);
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gfs2_log_shutdown(sdp);
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}
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gfs2_glock_xmote_th(gl, state, flags);
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}
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/**
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* trans_go_xmote_bh - After promoting/demoting the transaction glock
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* @gl: the glock
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*
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*/
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static void trans_go_xmote_bh(struct gfs2_glock *gl)
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{
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struct gfs2_sbd *sdp = gl->gl_sbd;
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struct gfs2_inode *ip = sdp->sd_jdesc->jd_inode->u.generic_ip;
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struct gfs2_glock *j_gl = ip->i_gl;
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struct gfs2_log_header head;
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int error;
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if (gl->gl_state != LM_ST_UNLOCKED &&
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test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
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gfs2_meta_cache_flush(sdp->sd_jdesc->jd_inode->u.generic_ip);
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j_gl->gl_ops->go_inval(j_gl, DIO_METADATA | DIO_DATA);
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error = gfs2_find_jhead(sdp->sd_jdesc, &head);
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if (error)
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gfs2_consist(sdp);
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if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT))
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gfs2_consist(sdp);
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/* Initialize some head of the log stuff */
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if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) {
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sdp->sd_log_sequence = head.lh_sequence + 1;
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gfs2_log_pointers_init(sdp, head.lh_blkno);
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}
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}
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}
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/**
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* trans_go_drop_th - unlock the transaction glock
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* @gl: the glock
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*
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* We want to sync the device even with localcaching. Remember
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* that localcaching journal replay only marks buffers dirty.
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*/
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static void trans_go_drop_th(struct gfs2_glock *gl)
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{
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struct gfs2_sbd *sdp = gl->gl_sbd;
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if (test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
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gfs2_meta_syncfs(sdp);
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gfs2_log_shutdown(sdp);
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}
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gfs2_glock_drop_th(gl);
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}
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/**
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* quota_go_demote_ok - Check to see if it's ok to unlock a quota 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 quota_go_demote_ok(struct gfs2_glock *gl)
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{
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return !atomic_read(&gl->gl_lvb_count);
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}
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struct gfs2_glock_operations gfs2_meta_glops = {
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.go_xmote_th = gfs2_glock_xmote_th,
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.go_drop_th = gfs2_glock_drop_th,
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.go_sync = meta_go_sync,
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.go_inval = meta_go_inval,
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.go_demote_ok = meta_go_demote_ok,
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.go_type = LM_TYPE_META
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};
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struct gfs2_glock_operations gfs2_inode_glops = {
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.go_xmote_th = inode_go_xmote_th,
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.go_xmote_bh = inode_go_xmote_bh,
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.go_drop_th = inode_go_drop_th,
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.go_sync = inode_go_sync,
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.go_inval = inode_go_inval,
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.go_demote_ok = inode_go_demote_ok,
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.go_lock = inode_go_lock,
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.go_unlock = inode_go_unlock,
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.go_greedy = inode_greedy,
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.go_type = LM_TYPE_INODE
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};
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struct gfs2_glock_operations gfs2_rgrp_glops = {
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.go_xmote_th = gfs2_glock_xmote_th,
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.go_drop_th = gfs2_glock_drop_th,
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.go_sync = meta_go_sync,
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.go_inval = meta_go_inval,
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.go_demote_ok = rgrp_go_demote_ok,
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.go_lock = rgrp_go_lock,
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.go_unlock = rgrp_go_unlock,
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.go_type = LM_TYPE_RGRP
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};
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struct gfs2_glock_operations gfs2_trans_glops = {
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.go_xmote_th = trans_go_xmote_th,
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.go_xmote_bh = trans_go_xmote_bh,
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.go_drop_th = trans_go_drop_th,
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.go_type = LM_TYPE_NONDISK
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};
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struct gfs2_glock_operations gfs2_iopen_glops = {
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.go_xmote_th = gfs2_glock_xmote_th,
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.go_drop_th = gfs2_glock_drop_th,
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.go_callback = gfs2_iopen_go_callback,
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.go_type = LM_TYPE_IOPEN
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};
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struct gfs2_glock_operations gfs2_flock_glops = {
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.go_xmote_th = gfs2_glock_xmote_th,
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.go_drop_th = gfs2_glock_drop_th,
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.go_type = LM_TYPE_FLOCK
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};
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struct gfs2_glock_operations gfs2_nondisk_glops = {
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.go_xmote_th = gfs2_glock_xmote_th,
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.go_drop_th = gfs2_glock_drop_th,
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.go_type = LM_TYPE_NONDISK
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};
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struct gfs2_glock_operations gfs2_quota_glops = {
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.go_xmote_th = gfs2_glock_xmote_th,
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.go_drop_th = gfs2_glock_drop_th,
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.go_demote_ok = quota_go_demote_ok,
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.go_type = LM_TYPE_QUOTA
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};
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struct gfs2_glock_operations gfs2_journal_glops = {
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.go_xmote_th = gfs2_glock_xmote_th,
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.go_drop_th = gfs2_glock_drop_th,
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.go_type = LM_TYPE_JOURNAL
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};
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