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-rw-r--r--fs/gfs2/trans.c214
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);
+ }
+}
+