This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / fs / gfs2 / trans.c

diff --git a/fs/gfs2/trans.c b/fs/gfs2/trans.c
new file mode 100644 (file)
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);
+}
+