[GFS2] The core of GFS2
This patch contains all the core files for GFS2.
Signed-off-by: David Teigland <teigland@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
diff --git a/fs/gfs2/glops.c b/fs/gfs2/glops.c
new file mode 100644
index 0000000..1270081
--- /dev/null
+++ b/fs/gfs2/glops.c
@@ -0,0 +1,487 @@
+/*
+ * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
+ * Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved.
+ *
+ * This copyrighted material is made available to anyone wishing to use,
+ * modify, copy, or redistribute it subject to the terms and conditions
+ * of the GNU General Public License v.2.
+ */
+
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/completion.h>
+#include <linux/buffer_head.h>
+#include <asm/semaphore.h>
+
+#include "gfs2.h"
+#include "bmap.h"
+#include "glock.h"
+#include "glops.h"
+#include "inode.h"
+#include "log.h"
+#include "meta_io.h"
+#include "page.h"
+#include "recovery.h"
+#include "rgrp.h"
+
+/**
+ * meta_go_sync - sync out the metadata for this glock
+ * @gl: the glock
+ * @flags: DIO_*
+ *
+ * Called when demoting or unlocking an EX glock. We must flush
+ * to disk all dirty buffers/pages relating to this glock, and must not
+ * not return to caller to demote/unlock the glock until I/O is complete.
+ */
+
+static void meta_go_sync(struct gfs2_glock *gl, int flags)
+{
+ if (!(flags & DIO_METADATA))
+ return;
+
+ if (test_and_clear_bit(GLF_DIRTY, &gl->gl_flags)) {
+ gfs2_log_flush_glock(gl);
+ gfs2_meta_sync(gl, flags | DIO_START | DIO_WAIT);
+ if (flags & DIO_RELEASE)
+ gfs2_ail_empty_gl(gl);
+ }
+
+ clear_bit(GLF_SYNC, &gl->gl_flags);
+}
+
+/**
+ * meta_go_inval - invalidate the metadata for this glock
+ * @gl: the glock
+ * @flags:
+ *
+ */
+
+static void meta_go_inval(struct gfs2_glock *gl, int flags)
+{
+ if (!(flags & DIO_METADATA))
+ return;
+
+ gfs2_meta_inval(gl);
+ gl->gl_vn++;
+}
+
+/**
+ * meta_go_demote_ok - Check to see if it's ok to unlock a glock
+ * @gl: the glock
+ *
+ * Returns: 1 if we have no cached data; ok to demote meta glock
+ */
+
+static int meta_go_demote_ok(struct gfs2_glock *gl)
+{
+ return !gl->gl_aspace->i_mapping->nrpages;
+}
+
+/**
+ * inode_go_xmote_th - promote/demote a glock
+ * @gl: the glock
+ * @state: the requested state
+ * @flags:
+ *
+ */
+
+static void inode_go_xmote_th(struct gfs2_glock *gl, unsigned int state,
+ int flags)
+{
+ if (gl->gl_state != LM_ST_UNLOCKED)
+ gfs2_pte_inval(gl);
+ gfs2_glock_xmote_th(gl, state, flags);
+}
+
+/**
+ * inode_go_xmote_bh - After promoting/demoting a glock
+ * @gl: the glock
+ *
+ */
+
+static void inode_go_xmote_bh(struct gfs2_glock *gl)
+{
+ struct gfs2_holder *gh = gl->gl_req_gh;
+ struct buffer_head *bh;
+ int error;
+
+ if (gl->gl_state != LM_ST_UNLOCKED &&
+ (!gh || !(gh->gh_flags & GL_SKIP))) {
+ error = gfs2_meta_read(gl, gl->gl_name.ln_number, DIO_START,
+ &bh);
+ if (!error)
+ brelse(bh);
+ }
+}
+
+/**
+ * inode_go_drop_th - unlock a glock
+ * @gl: the glock
+ *
+ * Invoked from rq_demote().
+ * Another node needs the lock in EXCLUSIVE mode, or lock (unused for too long)
+ * is being purged from our node's glock cache; we're dropping lock.
+ */
+
+static void inode_go_drop_th(struct gfs2_glock *gl)
+{
+ gfs2_pte_inval(gl);
+ gfs2_glock_drop_th(gl);
+}
+
+/**
+ * inode_go_sync - Sync the dirty data and/or metadata for an inode glock
+ * @gl: the glock protecting the inode
+ * @flags:
+ *
+ */
+
+static void inode_go_sync(struct gfs2_glock *gl, int flags)
+{
+ int meta = (flags & DIO_METADATA);
+ int data = (flags & DIO_DATA);
+
+ if (test_bit(GLF_DIRTY, &gl->gl_flags)) {
+ if (meta && data) {
+ gfs2_page_sync(gl, flags | DIO_START);
+ gfs2_log_flush_glock(gl);
+ gfs2_meta_sync(gl, flags | DIO_START | DIO_WAIT);
+ gfs2_page_sync(gl, flags | DIO_WAIT);
+ clear_bit(GLF_DIRTY, &gl->gl_flags);
+ } else if (meta) {
+ gfs2_log_flush_glock(gl);
+ gfs2_meta_sync(gl, flags | DIO_START | DIO_WAIT);
+ } else if (data)
+ gfs2_page_sync(gl, flags | DIO_START | DIO_WAIT);
+ if (flags & DIO_RELEASE)
+ gfs2_ail_empty_gl(gl);
+ }
+
+ clear_bit(GLF_SYNC, &gl->gl_flags);
+}
+
+/**
+ * inode_go_inval - prepare a inode glock to be released
+ * @gl: the glock
+ * @flags:
+ *
+ */
+
+static void inode_go_inval(struct gfs2_glock *gl, int flags)
+{
+ int meta = (flags & DIO_METADATA);
+ int data = (flags & DIO_DATA);
+
+ if (meta) {
+ gfs2_meta_inval(gl);
+ gl->gl_vn++;
+ }
+ if (data)
+ gfs2_page_inval(gl);
+}
+
+/**
+ * inode_go_demote_ok - Check to see if it's ok to unlock an inode glock
+ * @gl: the glock
+ *
+ * Returns: 1 if it's ok
+ */
+
+static int inode_go_demote_ok(struct gfs2_glock *gl)
+{
+ struct gfs2_sbd *sdp = gl->gl_sbd;
+ int demote = 0;
+
+ if (!get_gl2ip(gl) && !gl->gl_aspace->i_mapping->nrpages)
+ demote = 1;
+ else if (!sdp->sd_args.ar_localcaching &&
+ time_after_eq(jiffies, gl->gl_stamp +
+ gfs2_tune_get(sdp, gt_demote_secs) * HZ))
+ demote = 1;
+
+ return demote;
+}
+
+/**
+ * inode_go_lock - operation done after an inode lock is locked by a process
+ * @gl: the glock
+ * @flags:
+ *
+ * Returns: errno
+ */
+
+static int inode_go_lock(struct gfs2_holder *gh)
+{
+ struct gfs2_glock *gl = gh->gh_gl;
+ struct gfs2_inode *ip = get_gl2ip(gl);
+ int error = 0;
+
+ if (!ip)
+ return 0;
+
+ if (ip->i_vn != gl->gl_vn) {
+ error = gfs2_inode_refresh(ip);
+ if (error)
+ return error;
+ gfs2_inode_attr_in(ip);
+ }
+
+ if ((ip->i_di.di_flags & GFS2_DIF_TRUNC_IN_PROG) &&
+ (gl->gl_state == LM_ST_EXCLUSIVE) &&
+ (gh->gh_flags & GL_LOCAL_EXCL))
+ error = gfs2_truncatei_resume(ip);
+
+ return error;
+}
+
+/**
+ * inode_go_unlock - operation done before an inode lock is unlocked by a
+ * process
+ * @gl: the glock
+ * @flags:
+ *
+ */
+
+static void inode_go_unlock(struct gfs2_holder *gh)
+{
+ struct gfs2_glock *gl = gh->gh_gl;
+ struct gfs2_inode *ip = get_gl2ip(gl);
+
+ if (ip && test_bit(GLF_DIRTY, &gl->gl_flags))
+ gfs2_inode_attr_in(ip);
+
+ if (ip)
+ gfs2_meta_cache_flush(ip);
+}
+
+/**
+ * inode_greedy -
+ * @gl: the glock
+ *
+ */
+
+static void inode_greedy(struct gfs2_glock *gl)
+{
+ struct gfs2_sbd *sdp = gl->gl_sbd;
+ struct gfs2_inode *ip = get_gl2ip(gl);
+ unsigned int quantum = gfs2_tune_get(sdp, gt_greedy_quantum);
+ unsigned int max = gfs2_tune_get(sdp, gt_greedy_max);
+ unsigned int new_time;
+
+ spin_lock(&ip->i_spin);
+
+ if (time_after(ip->i_last_pfault + quantum, jiffies)) {
+ new_time = ip->i_greedy + quantum;
+ if (new_time > max)
+ new_time = max;
+ } else {
+ new_time = ip->i_greedy - quantum;
+ if (!new_time || new_time > max)
+ new_time = 1;
+ }
+
+ ip->i_greedy = new_time;
+
+ spin_unlock(&ip->i_spin);
+
+ gfs2_inode_put(ip);
+}
+
+/**
+ * rgrp_go_demote_ok - Check to see if it's ok to unlock a RG's glock
+ * @gl: the glock
+ *
+ * Returns: 1 if it's ok
+ */
+
+static int rgrp_go_demote_ok(struct gfs2_glock *gl)
+{
+ return !gl->gl_aspace->i_mapping->nrpages;
+}
+
+/**
+ * rgrp_go_lock - operation done after an rgrp lock is locked by
+ * a first holder on this node.
+ * @gl: the glock
+ * @flags:
+ *
+ * Returns: errno
+ */
+
+static int rgrp_go_lock(struct gfs2_holder *gh)
+{
+ return gfs2_rgrp_bh_get(get_gl2rgd(gh->gh_gl));
+}
+
+/**
+ * rgrp_go_unlock - operation done before an rgrp lock is unlocked by
+ * a last holder on this node.
+ * @gl: the glock
+ * @flags:
+ *
+ */
+
+static void rgrp_go_unlock(struct gfs2_holder *gh)
+{
+ gfs2_rgrp_bh_put(get_gl2rgd(gh->gh_gl));
+}
+
+/**
+ * trans_go_xmote_th - promote/demote the transaction glock
+ * @gl: the glock
+ * @state: the requested state
+ * @flags:
+ *
+ */
+
+static void trans_go_xmote_th(struct gfs2_glock *gl, unsigned int state,
+ int flags)
+{
+ struct gfs2_sbd *sdp = gl->gl_sbd;
+
+ if (gl->gl_state != LM_ST_UNLOCKED &&
+ test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
+ gfs2_meta_syncfs(sdp);
+ gfs2_log_shutdown(sdp);
+ }
+
+ gfs2_glock_xmote_th(gl, state, flags);
+}
+
+/**
+ * trans_go_xmote_bh - After promoting/demoting the transaction glock
+ * @gl: the glock
+ *
+ */
+
+static void trans_go_xmote_bh(struct gfs2_glock *gl)
+{
+ struct gfs2_sbd *sdp = gl->gl_sbd;
+ struct gfs2_glock *j_gl = sdp->sd_jdesc->jd_inode->i_gl;
+ struct gfs2_log_header head;
+ int error;
+
+ if (gl->gl_state != LM_ST_UNLOCKED &&
+ test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
+ gfs2_meta_cache_flush(sdp->sd_jdesc->jd_inode);
+ j_gl->gl_ops->go_inval(j_gl, DIO_METADATA | DIO_DATA);
+
+ error = gfs2_find_jhead(sdp->sd_jdesc, &head);
+ if (error)
+ gfs2_consist(sdp);
+ if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT))
+ gfs2_consist(sdp);
+
+ /* Initialize some head of the log stuff */
+ if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) {
+ sdp->sd_log_sequence = head.lh_sequence + 1;
+ gfs2_log_pointers_init(sdp, head.lh_blkno);
+ }
+ }
+}
+
+/**
+ * trans_go_drop_th - unlock the transaction glock
+ * @gl: the glock
+ *
+ * We want to sync the device even with localcaching. Remember
+ * that localcaching journal replay only marks buffers dirty.
+ */
+
+static void trans_go_drop_th(struct gfs2_glock *gl)
+{
+ struct gfs2_sbd *sdp = gl->gl_sbd;
+
+ if (test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
+ gfs2_meta_syncfs(sdp);
+ gfs2_log_shutdown(sdp);
+ }
+
+ gfs2_glock_drop_th(gl);
+}
+
+/**
+ * quota_go_demote_ok - Check to see if it's ok to unlock a quota glock
+ * @gl: the glock
+ *
+ * Returns: 1 if it's ok
+ */
+
+static int quota_go_demote_ok(struct gfs2_glock *gl)
+{
+ return !atomic_read(&gl->gl_lvb_count);
+}
+
+struct gfs2_glock_operations gfs2_meta_glops = {
+ .go_xmote_th = gfs2_glock_xmote_th,
+ .go_drop_th = gfs2_glock_drop_th,
+ .go_sync = meta_go_sync,
+ .go_inval = meta_go_inval,
+ .go_demote_ok = meta_go_demote_ok,
+ .go_type = LM_TYPE_META
+};
+
+struct gfs2_glock_operations gfs2_inode_glops = {
+ .go_xmote_th = inode_go_xmote_th,
+ .go_xmote_bh = inode_go_xmote_bh,
+ .go_drop_th = inode_go_drop_th,
+ .go_sync = inode_go_sync,
+ .go_inval = inode_go_inval,
+ .go_demote_ok = inode_go_demote_ok,
+ .go_lock = inode_go_lock,
+ .go_unlock = inode_go_unlock,
+ .go_greedy = inode_greedy,
+ .go_type = LM_TYPE_INODE
+};
+
+struct gfs2_glock_operations gfs2_rgrp_glops = {
+ .go_xmote_th = gfs2_glock_xmote_th,
+ .go_drop_th = gfs2_glock_drop_th,
+ .go_sync = meta_go_sync,
+ .go_inval = meta_go_inval,
+ .go_demote_ok = rgrp_go_demote_ok,
+ .go_lock = rgrp_go_lock,
+ .go_unlock = rgrp_go_unlock,
+ .go_type = LM_TYPE_RGRP
+};
+
+struct gfs2_glock_operations gfs2_trans_glops = {
+ .go_xmote_th = trans_go_xmote_th,
+ .go_xmote_bh = trans_go_xmote_bh,
+ .go_drop_th = trans_go_drop_th,
+ .go_type = LM_TYPE_NONDISK
+};
+
+struct gfs2_glock_operations gfs2_iopen_glops = {
+ .go_xmote_th = gfs2_glock_xmote_th,
+ .go_drop_th = gfs2_glock_drop_th,
+ .go_callback = gfs2_iopen_go_callback,
+ .go_type = LM_TYPE_IOPEN
+};
+
+struct gfs2_glock_operations gfs2_flock_glops = {
+ .go_xmote_th = gfs2_glock_xmote_th,
+ .go_drop_th = gfs2_glock_drop_th,
+ .go_type = LM_TYPE_FLOCK
+};
+
+struct gfs2_glock_operations gfs2_nondisk_glops = {
+ .go_xmote_th = gfs2_glock_xmote_th,
+ .go_drop_th = gfs2_glock_drop_th,
+ .go_type = LM_TYPE_NONDISK
+};
+
+struct gfs2_glock_operations gfs2_quota_glops = {
+ .go_xmote_th = gfs2_glock_xmote_th,
+ .go_drop_th = gfs2_glock_drop_th,
+ .go_demote_ok = quota_go_demote_ok,
+ .go_type = LM_TYPE_QUOTA
+};
+
+struct gfs2_glock_operations gfs2_journal_glops = {
+ .go_xmote_th = gfs2_glock_xmote_th,
+ .go_drop_th = gfs2_glock_drop_th,
+ .go_type = LM_TYPE_JOURNAL
+};
+