[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 000000000000..afa5408c0008
--- /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);
+        }
+}
+