[PATCH 8/67] aufs module global variables and operations

[hooanon05]

From: Junjiro Okajima <hooanon05@xxxxxxxxxxx>

	initial commit
	aufs module global variables and operations

Signed-off-by: Junjiro Okajima <hooanon05@xxxxxxxxxxx>
---
 fs/aufs/module.c |  243 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 243 insertions(+), 0 deletions(-)

diff --git a/fs/aufs/module.c b/fs/aufs/module.c
new file mode 100644
index 0000000..c5577c7
--- /dev/null
+++ b/fs/aufs/module.c
@@ -0,0 +1,243 @@
+/*
+ * Copyright (C) 2007 Junjiro Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+/*
+ * module global variables and operations
+ *
+ * $Id: module.c,v 1.3 2008/04/28 03:02:06 sfjro Exp $
+ */
+
+#include <linux/module.h>
+#include "aufs.h"
+
+/* ---------------------------------------------------------------------- */
+
+/*
+ * aufs caches
+ */
+struct kmem_cache *au_cachep[AuCache_Last];
+static int __init create_cache(void)
+{
+	au_cachep[AuCache_DINFO] = AuCache(au_dinfo);
+	if (au_cachep[AuCache_DINFO])
+		au_cachep[AuCache_ICNTNR] = AuCache(aufs_icntnr);
+	if (au_cachep[AuCache_ICNTNR])
+		au_cachep[AuCache_FINFO] = AuCache(au_finfo);
+	//au_cachep[AuCache_FINFO] = NULL;
+	if (au_cachep[AuCache_FINFO])
+		au_cachep[AuCache_VDIR] = AuCache(au_vdir);
+	if (au_cachep[AuCache_VDIR])
+		au_cachep[AuCache_DEHSTR] = AuCache(au_vdir_dehstr);
+	if (au_cachep[AuCache_DEHSTR])
+		return 0;
+
+	return -ENOMEM;
+}
+
+static void destroy_cache(void)
+{
+	int i;
+	for (i = 0; i < AuCache_Last; i++)
+		if (au_cachep[i]) {
+			kmem_cache_destroy(au_cachep[i]);
+			au_cachep[i] = NULL;
+		}
+}
+
+/* ---------------------------------------------------------------------- */
+
+char au_esc_chars[0x20 + 3]; /* 0x01-0x20, backslash, del, and NULL */
+int au_dir_roflags;
+
+/*
+ * functions for module interface.
+ */
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Junjiro Okajima");
+MODULE_DESCRIPTION(AUFS_NAME " -- Another unionfs");
+MODULE_VERSION(AUFS_VERSION);
+
+/* it should be 'byte', but param_set_byte() prints it by "%c" */
+short aufs_nwkq = AUFS_NWKQ_DEF;
+MODULE_PARM_DESC(nwkq, "the number of workqueue thread, " AUFS_WKQ_NAME);
+module_param_named(nwkq, aufs_nwkq, short, S_IRUGO);
+
+int sysaufs_brs;
+MODULE_PARM_DESC(brs, "use <sysfs>/fs/aufs/si_*/brN");
+module_param_named(brs, sysaufs_brs, int, S_IRUGO);
+
+/* ---------------------------------------------------------------------- */
+
+static int __init aufs_init(void)
+{
+	int err, i;
+	char *p;
+
+	au_debug_init();
+
+	p = au_esc_chars;
+	for (i = 1; i <= ' '; i++)
+		*p++ = i;
+	*p++ = '\\';
+	*p++ = '\x7f';
+	*p = 0;
+
+	au_dir_roflags = au_file_roflags(O_DIRECTORY | O_LARGEFILE);
+
+	err = -EINVAL;
+	if (unlikely(aufs_nwkq <= 0))
+		goto out;
+
+	err = sysaufs_init();
+	if (unlikely(err))
+		goto out;
+	err = au_wkq_init();
+	if (unlikely(err))
+		goto out_sysaufs;
+	err = au_inotify_init();
+	if (unlikely(err))
+		goto out_wkq;
+	err = au_sysrq_init();
+	if (unlikely(err))
+		goto out_inotify;
+
+	err = create_cache();
+	if (unlikely(err))
+		goto out_sysrq;
+
+	err = register_filesystem(&aufs_fs_type);
+	if (unlikely(err))
+		goto out_cache;
+	pr_info(AUFS_NAME " " AUFS_VERSION "\n");
+	return 0; /* success */
+
+ out_cache:
+	destroy_cache();
+ out_sysrq:
+	au_sysrq_fin();
+ out_inotify:
+	au_inotify_fin();
+ out_wkq:
+	au_wkq_fin();
+ out_sysaufs:
+	sysaufs_fin();
+ out:
+	AuTraceErr(err);
+	return err;
+}
+
+static void __exit aufs_exit(void)
+{
+	unregister_filesystem(&aufs_fs_type);
+	destroy_cache();
+
+	au_sysrq_fin();
+	au_inotify_fin();
+	au_wkq_fin();
+	sysaufs_fin();
+}
+
+module_init(aufs_init);
+module_exit(aufs_exit);
+
+/* ---------------------------------------------------------------------- */
+
+/* fake Kconfig */
+#if 1
+
+#ifdef CONFIG_AUFS_HINOTIFY
+#ifndef CONFIG_INOTIFY
+#error enable CONFIG_INOTIFY to use CONFIG_AUFS_HINOTIFY.
+#endif
+#endif /* CONFIG_AUFS_HINOTIFY */
+
+#if AUFS_BRANCH_MAX > 511 && PAGE_SIZE > 4096
+#warning pagesize is larger than 4kb, \
+	CONFIG_AUFS_BRANCH_MAX_511 or smaller is recommended.
+#endif
+
+#ifdef CONFIG_AUFS_STAT
+#ifndef CONFIG_SYSFS
+#error CONFIG_AUFS_STAT requires CONFIG_SYSFS.
+#endif
+#endif /* CONFIG_AUFS_STAT */
+
+#ifdef CONFIG_AUFS_SYSAUFS
+#warning CONFIG_AUFS_SYSAUFS is unnecessary for linux-2.6.25 and later.
+#endif
+
+#ifdef CONFIG_AUFS_EXPORT
+#if !defined(CONFIG_EXPORTFS) && !defined(CONFIG_EXPORTFS_MODULE)
+#error CONFIG_AUFS_EXPORT requires CONFIG_EXPORTFS
+#endif
+#if defined(CONFIG_EXPORTFS_MODULE) && defined(CONFIG_AUFS)
+#error need CONFIG_EXPORTFS = y to link aufs statically with CONFIG_AUFS_EXPORT
+#endif
+#endif /* CONFIG_AUFS_EXPORT */
+
+#ifdef CONFIG_AUFS_SEC_PERM_PATCH
+#ifndef CONFIG_SECURITY
+#warning CONFIG_AUFS_SEC_PERM_PATCH is unnecessary since CONFIG_SECURITY is disabled.
+#endif
+#ifdef CONFIG_AUFS
+#warning CONFIG_AUFS_SEC_PERM_PATCH is unnecessary since CONFIG_AUFS is not a module.
+#endif
+#endif
+
+#ifdef CONFIG_AUFS_PUT_FILP_PATCH
+#if !defined(CONFIG_NFS_FS) && !defined(CONFIG_NFS_FS_MODULE)
+#warning CONFIG_AUFS_PUT_FILP_PATCH is unnecessary since CONFIG_NFS_FS is disabled.
+#endif
+#ifdef CONFIG_AUFS
+#warning CONFIG_AUFS_PUT_FILP_PATCH is unnecessary since CONFIG_AUFS is not a module.
+#endif
+#ifdef CONFIG_AUFS_FAKE_DM
+#error CONFIG_AUFS_FAKE_DM must be disabled for CONFIG_AUFS_PUT_FILP_PATCH.
+#endif
+#endif /* CONFIG_AUFS_PUT_FILP_PATCH */
+
+#ifdef CONFIG_AUFS_LHASH_PATCH
+#if !defined(CONFIG_NFS_FS) && !defined(CONFIG_NFS_FS_MODULE)
+#warning CONFIG_AUFS_LHASH_PATCH is unnecessary since CONFIG_NFS_FS is disabled.
+#endif
+#ifdef CONFIG_AUFS_FAKE_DM
+#error CONFIG_AUFS_FAKE_DM must be disabled for CONFIG_AUFS_LHASH_PATCH.
+#endif
+#endif
+
+#ifdef CONFIG_AUFS_KSIZE_PATCH
+#warning CONFIG_AUFS_KSIZE_PATCH is unnecessary for linux-2.6.22 and later.
+#endif
+
+#ifdef CONFIG_AUFS_WORKAROUND_FUSE
+#if !defined(CONFIG_FUSE_FS) && !defined(CONFIG_FUSE_FS_MODULE)
+#warning CONFIG_AUFS_WORKAROUND_FUSE is enabled while FUSE is disabled.
+#endif
+#endif
+
+#ifdef CONFIG_DEBUG_PROVE_LOCKING
+#if MAX_LOCKDEP_SUBCLASSES < AuLsc_I_End
+#warning lockdep will not work since aufs uses deeper locks.
+#endif
+#endif
+
+#ifdef CONFIG_AUFS_COMPAT
+#warning CONFIG_AUFS_COMPAT will be removed in the near future.
+#endif
+
+#endif
-- 
1.4.4.4

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