1 files changed, 184 insertions, 0 deletions
diff --git a/fs/gfs2/trans.c b/fs/gfs2/trans.c
new file mode 100644
index 0000000..f8dabf8
--- /dev/null
+++ b/fs/gfs2/trans.c
@@ -0,0 +1,184 @@
+/*
+ * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
+ * Copyright (C) 2004-2006 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 version 2.
+ */
+
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/completion.h>
+#include <linux/buffer_head.h>
+#include <linux/gfs2_ondisk.h>
+#include <linux/kallsyms.h>
+#include <linux/lm_interface.h>
+
+#include "gfs2.h"
+#include "incore.h"
+#include "glock.h"
+#include "log.h"
+#include "lops.h"
+#include "meta_io.h"
+#include "trans.h"
+#include "util.h"
+
+int gfs2_trans_begin(struct gfs2_sbd *sdp, unsigned int blocks,
+		     unsigned int revokes)
+{
+	struct gfs2_trans *tr;
+	int error;
+
+	BUG_ON(current->journal_info);
+	BUG_ON(blocks == 0 && revokes == 0);
+
+	tr = kzalloc(sizeof(struct gfs2_trans), GFP_NOFS);
+	if (!tr)
+		return -ENOMEM;
+
+	tr->tr_ip = (unsigned long)__builtin_return_address(0);
+	tr->tr_blocks = blocks;
+	tr->tr_revokes = revokes;
+	tr->tr_reserved = 1;
+	if (blocks)
+		tr->tr_reserved += 6 + blocks;
+	if (revokes)
+		tr->tr_reserved += gfs2_struct2blk(sdp, revokes,
+						   sizeof(u64));
+	INIT_LIST_HEAD(&tr->tr_list_buf);
+
+	gfs2_holder_init(sdp->sd_trans_gl, LM_ST_SHARED, 0, &tr->tr_t_gh);
+
+	error = gfs2_glock_nq(&tr->tr_t_gh);
+	if (error)
+		goto fail_holder_uninit;
+
+	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;
+
+	current->journal_info = tr;
+
+	return 0;
+
+fail_gunlock:
+	gfs2_glock_dq(&tr->tr_t_gh);
+
+fail_holder_uninit:
+	gfs2_holder_uninit(&tr->tr_t_gh);
+	kfree(tr);
+
+	return error;
+}
+
+void gfs2_trans_end(struct gfs2_sbd *sdp)
+{
+	struct gfs2_trans *tr = current->journal_info;
+
+	BUG_ON(!tr);
+	current->journal_info = NULL;
+
+	if (!tr->tr_touched) {
+		gfs2_log_release(sdp, tr->tr_reserved);
+		gfs2_glock_dq(&tr->tr_t_gh);
+		gfs2_holder_uninit(&tr->tr_t_gh);
+		kfree(tr);
+		return;
+	}
+
+	if (gfs2_assert_withdraw(sdp, tr->tr_num_buf <= tr->tr_blocks)) {
+		fs_err(sdp, "tr_num_buf = %u, tr_blocks = %u ",
+		       tr->tr_num_buf, tr->tr_blocks);
+		print_symbol(KERN_WARNING "GFS2: Transaction created at: %s\n", tr->tr_ip);
+	}
+	if (gfs2_assert_withdraw(sdp, tr->tr_num_revoke <= tr->tr_revokes)) {
+		fs_err(sdp, "tr_num_revoke = %u, tr_revokes = %u ",
+		       tr->tr_num_revoke, tr->tr_revokes);
+		print_symbol(KERN_WARNING "GFS2: Transaction created at: %s\n", tr->tr_ip);
+	}
+
+	gfs2_log_commit(sdp, tr);
+        gfs2_glock_dq(&tr->tr_t_gh);
+        gfs2_holder_uninit(&tr->tr_t_gh);
+        kfree(tr);
+
+	if (sdp->sd_vfs->s_flags & MS_SYNCHRONOUS)
+		gfs2_log_flush(sdp, NULL);
+}
+
+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
+ * @meta: True in the case of adding metadata
+ *
+ */
+
+void gfs2_trans_add_bh(struct gfs2_glock *gl, struct buffer_head *bh, int meta)
+{
+	struct gfs2_sbd *sdp = gl->gl_sbd;
+	struct gfs2_bufdata *bd;
+
+	bd = bh->b_private;
+	if (bd)
+		gfs2_assert(sdp, bd->bd_gl == gl);
+	else {
+		gfs2_attach_bufdata(gl, bh, meta);
+		bd = bh->b_private;
+	}
+	lops_add(sdp, &bd->bd_le);
+}
+
+void gfs2_trans_add_revoke(struct gfs2_sbd *sdp, u64 blkno)
+{
+	struct gfs2_revoke *rv = kmalloc(sizeof(struct gfs2_revoke),
+					 GFP_NOFS | __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, u64 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) {
+		struct gfs2_trans *tr = current->journal_info;
+		kfree(rv);
+		tr->tr_num_revoke_rm++;
+	}
+}
+
+void gfs2_trans_add_rg(struct gfs2_rgrpd *rgd)
+{
+	lops_add(rgd->rd_sbd, &rgd->rd_le);
+}
+