[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>

1 files changed, 214 insertions, 0 deletions

diff --git a/fs/gfs2/trans.c b/fs/gfs2/trans.c
new file mode 100644
index 00000000000..afa5408c000
--- /dev/null
+++ b/fs/gfs2/trans.c
@@ -0,0 +1,214 @@
+/*
+ * 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 "glock.h"
+#include "log.h"
+#include "lops.h"
+#include "meta_io.h"
+#include "trans.h"
+
+int gfs2_trans_begin_i(struct gfs2_sbd *sdp, unsigned int blocks,
+		       unsigned int revokes, char *file, unsigned int line)
+{
+	struct gfs2_trans *tr;
+	int error;
+
+	if (gfs2_assert_warn(sdp, !get_transaction) ||
+	    gfs2_assert_warn(sdp, blocks || revokes)) {
+		fs_warn(sdp, "(%s, %u)\n", file, line);
+		return -EINVAL;
+	}
+
+	tr = kzalloc(sizeof(struct gfs2_trans), GFP_KERNEL);
+	if (!tr)
+		return -ENOMEM;
+
+	tr->tr_file = file;
+	tr->tr_line = line;
+	tr->tr_blocks = blocks;
+	tr->tr_revokes = revokes;
+	tr->tr_reserved = 1;
+	if (blocks)
+		tr->tr_reserved += 1 + blocks;
+	if (revokes)
+		tr->tr_reserved += gfs2_struct2blk(sdp, revokes,
+						   sizeof(uint64_t));
+	INIT_LIST_HEAD(&tr->tr_list_buf);
+
+	error = -ENOMEM;
+	tr->tr_t_gh = gfs2_holder_get(sdp->sd_trans_gl, LM_ST_SHARED,
+				      GL_NEVER_RECURSE, GFP_KERNEL);
+	if (!tr->tr_t_gh)
+		goto fail;
+
+	error = gfs2_glock_nq(tr->tr_t_gh);
+	if (error)
+		goto fail_holder_put;
+
+	if (!test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
+		tr->tr_t_gh->gh_flags |= GL_NOCACHE;
+		error = -EROFS;
+		goto fail_gunlock;
+	}
+
+	error = gfs2_log_reserve(sdp, tr->tr_reserved);
+	if (error)
+		goto fail_gunlock;
+
+	set_transaction(tr);
+
+	return 0;
+
+ fail_gunlock:
+	gfs2_glock_dq(tr->tr_t_gh);
+
+ fail_holder_put:
+	gfs2_holder_put(tr->tr_t_gh);
+
+ fail:
+	kfree(tr);
+
+	return error;
+}
+
+void gfs2_trans_end(struct gfs2_sbd *sdp)
+{
+	struct gfs2_trans *tr;
+	struct gfs2_holder *t_gh;
+
+	tr = get_transaction;
+	set_transaction(NULL);
+
+	if (gfs2_assert_warn(sdp, tr))
+		return;
+
+	t_gh = tr->tr_t_gh;
+	tr->tr_t_gh = NULL;
+
+	if (!tr->tr_touched) {
+		gfs2_log_release(sdp, tr->tr_reserved);
+		kfree(tr);
+
+		gfs2_glock_dq(t_gh);
+		gfs2_holder_put(t_gh);
+
+		return;
+	}
+
+	if (gfs2_assert_withdraw(sdp, tr->tr_num_buf <= tr->tr_blocks))
+		fs_err(sdp, "tr_num_buf = %u, tr_blocks = %u "
+		       "tr_file = %s, tr_line = %u\n",
+		       tr->tr_num_buf, tr->tr_blocks,
+		       tr->tr_file, tr->tr_line);
+	if (gfs2_assert_withdraw(sdp, tr->tr_num_revoke <= tr->tr_revokes))
+		fs_err(sdp, "tr_num_revoke = %u, tr_revokes = %u "
+		       "tr_file = %s, tr_line = %u\n",
+		       tr->tr_num_revoke, tr->tr_revokes,
+		       tr->tr_file, tr->tr_line);
+
+	gfs2_log_commit(sdp, tr);
+
+	gfs2_glock_dq(t_gh);
+	gfs2_holder_put(t_gh);
+
+	if (sdp->sd_vfs->s_flags & MS_SYNCHRONOUS)
+		gfs2_log_flush(sdp);
+}
+
+void gfs2_trans_add_gl(struct gfs2_glock *gl)
+{
+	lops_add(gl->gl_sbd, &gl->gl_le);
+}
+
+/**
+ * gfs2_trans_add_bh - Add a to-be-modified buffer to the current transaction
+ * @gl: the glock the buffer belongs to
+ * @bh: The buffer to add
+ *
+ */
+
+void gfs2_trans_add_bh(struct gfs2_glock *gl, struct buffer_head *bh)
+{
+	struct gfs2_sbd *sdp = gl->gl_sbd;
+	struct gfs2_bufdata *bd;
+
+	bd = get_v2bd(bh);
+	if (bd)
+		gfs2_assert(sdp, bd->bd_gl == gl);
+	else {
+		gfs2_meta_attach_bufdata(gl, bh);
+		bd = get_v2bd(bh);
+	}
+
+	lops_add(sdp, &bd->bd_le);
+}
+
+void gfs2_trans_add_revoke(struct gfs2_sbd *sdp, uint64_t blkno)
+{
+	struct gfs2_revoke *rv = kmalloc(sizeof(struct gfs2_revoke),
+					 GFP_KERNEL | __GFP_NOFAIL);
+	lops_init_le(&rv->rv_le, &gfs2_revoke_lops);
+	rv->rv_blkno = blkno;
+	lops_add(sdp, &rv->rv_le);
+}
+
+void gfs2_trans_add_unrevoke(struct gfs2_sbd *sdp, uint64_t blkno)
+{
+	struct gfs2_revoke *rv;
+	int found = 0;
+
+	gfs2_log_lock(sdp);
+
+	list_for_each_entry(rv, &sdp->sd_log_le_revoke, rv_le.le_list) {
+		if (rv->rv_blkno == blkno) {
+			list_del(&rv->rv_le.le_list);
+			gfs2_assert_withdraw(sdp, sdp->sd_log_num_revoke);
+			sdp->sd_log_num_revoke--;
+			found = 1;
+			break;
+		}
+	}
+
+	gfs2_log_unlock(sdp);
+
+	if (found) {
+		kfree(rv);
+		get_transaction->tr_num_revoke_rm++;
+	}
+}
+
+void gfs2_trans_add_rg(struct gfs2_rgrpd *rgd)
+{
+	lops_add(rgd->rd_sbd, &rgd->rd_le);
+}
+
+void gfs2_trans_add_databuf(struct gfs2_sbd *sdp, struct buffer_head *bh)
+{
+	struct gfs2_databuf *db;
+
+	db = get_v2db(bh);
+	if (!db) {
+		db = kmalloc(sizeof(struct gfs2_databuf),
+			     GFP_KERNEL | __GFP_NOFAIL);
+		lops_init_le(&db->db_le, &gfs2_databuf_lops);
+		get_bh(bh);
+		db->db_bh = bh;
+		set_v2db(bh, db);
+		lops_add(sdp, &db->db_le);
+	}
+}
+