Linux-libre 4.5.1-gnupck-4.5.1-gnu

1 files changed, 207 insertions, 0 deletions

diff --git a/fs/aufs/module.c b/fs/aufs/module.c
new file mode 100644
index 000000000..8a28377c5
--- /dev/null
+++ b/fs/aufs/module.c
@@ -0,0 +1,207 @@
+/*
+ * Copyright (C) 2005-2016 Junjiro R. Okajima
+ */
+
+/*
+ * module global variables and operations
+ */
+
+#include <linux/module.h>
+#include <linux/seq_file.h>
+#include "aufs.h"
+
+void *au_kzrealloc(void *p, unsigned int nused, unsigned int new_sz, gfp_t gfp)
+{
+	if (new_sz <= nused)
+		return p;
+
+	p = krealloc(p, new_sz, gfp);
+	if (p)
+		memset(p + nused, 0, new_sz - nused);
+	return p;
+}
+
+/* ---------------------------------------------------------------------- */
+
+/*
+ * aufs caches
+ */
+struct kmem_cache *au_cachep[AuCache_Last];
+static int __init au_cache_init(void)
+{
+	au_cachep[AuCache_DINFO] = AuCacheCtor(au_dinfo, au_di_init_once);
+	if (au_cachep[AuCache_DINFO])
+		/* SLAB_DESTROY_BY_RCU */
+		au_cachep[AuCache_ICNTNR] = AuCacheCtor(au_icntnr,
+							au_icntnr_init_once);
+	if (au_cachep[AuCache_ICNTNR])
+		au_cachep[AuCache_FINFO] = AuCacheCtor(au_finfo,
+						       au_fi_init_once);
+	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 au_cache_fin(void)
+{
+	int i;
+
+	/*
+	 * Make sure all delayed rcu free inodes are flushed before we
+	 * destroy cache.
+	 */
+	rcu_barrier();
+
+	/* excluding AuCache_HNOTIFY */
+	BUILD_BUG_ON(AuCache_HNOTIFY + 1 != AuCache_Last);
+	for (i = 0; i < AuCache_HNOTIFY; i++) {
+		kmem_cache_destroy(au_cachep[i]);
+		au_cachep[i] = NULL;
+	}
+}
+
+/* ---------------------------------------------------------------------- */
+
+int au_dir_roflags;
+
+#ifdef CONFIG_AUFS_SBILIST
+/*
+ * iterate_supers_type() doesn't protect us from
+ * remounting (branch management)
+ */
+struct au_splhead au_sbilist;
+#endif
+
+struct lock_class_key au_lc_key[AuLcKey_Last];
+
+/*
+ * functions for module interface.
+ */
+MODULE_LICENSE("GPL");
+/* MODULE_LICENSE("GPL v2"); */
+MODULE_AUTHOR("Junjiro R. Okajima <aufs-users@lists.sourceforge.net>");
+MODULE_DESCRIPTION(AUFS_NAME
+	" -- Advanced multi layered unification filesystem");
+MODULE_VERSION(AUFS_VERSION);
+
+/* this module parameter has no meaning when SYSFS is disabled */
+int sysaufs_brs = 1;
+MODULE_PARM_DESC(brs, "use <sysfs>/fs/aufs/si_*/brN");
+module_param_named(brs, sysaufs_brs, int, S_IRUGO);
+
+/* this module parameter has no meaning when USER_NS is disabled */
+bool au_userns;
+MODULE_PARM_DESC(allow_userns, "allow unprivileged to mount under userns");
+module_param_named(allow_userns, au_userns, bool, S_IRUGO);
+
+/* ---------------------------------------------------------------------- */
+
+static char au_esc_chars[0x20 + 3]; /* 0x01-0x20, backslash, del, and NULL */
+
+int au_seq_path(struct seq_file *seq, struct path *path)
+{
+	int err;
+
+	err = seq_path(seq, path, au_esc_chars);
+	if (err > 0)
+		err = 0;
+	else if (err < 0)
+		err = -ENOMEM;
+
+	return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+static int __init aufs_init(void)
+{
+	int err, i;
+	char *p;
+
+	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);
+
+	memcpy(aufs_iop_nogetattr, aufs_iop, sizeof(aufs_iop));
+	for (i = 0; i < AuIop_Last; i++)
+		aufs_iop_nogetattr[i].getattr = NULL;
+
+	au_sbilist_init();
+	sysaufs_brs_init();
+	au_debug_init();
+	au_dy_init();
+	err = sysaufs_init();
+	if (unlikely(err))
+		goto out;
+	err = au_procfs_init();
+	if (unlikely(err))
+		goto out_sysaufs;
+	err = au_wkq_init();
+	if (unlikely(err))
+		goto out_procfs;
+	err = au_loopback_init();
+	if (unlikely(err))
+		goto out_wkq;
+	err = au_hnotify_init();
+	if (unlikely(err))
+		goto out_loopback;
+	err = au_sysrq_init();
+	if (unlikely(err))
+		goto out_hin;
+	err = au_cache_init();
+	if (unlikely(err))
+		goto out_sysrq;
+
+	aufs_fs_type.fs_flags |= au_userns ? FS_USERNS_MOUNT : 0;
+	err = register_filesystem(&aufs_fs_type);
+	if (unlikely(err))
+		goto out_cache;
+
+	/* since we define pr_fmt, call printk directly */
+	printk(KERN_INFO AUFS_NAME " " AUFS_VERSION "\n");
+	goto out; /* success */
+
+out_cache:
+	au_cache_fin();
+out_sysrq:
+	au_sysrq_fin();
+out_hin:
+	au_hnotify_fin();
+out_loopback:
+	au_loopback_fin();
+out_wkq:
+	au_wkq_fin();
+out_procfs:
+	au_procfs_fin();
+out_sysaufs:
+	sysaufs_fin();
+	au_dy_fin();
+out:
+	return err;
+}
+
+static void __exit aufs_exit(void)
+{
+	unregister_filesystem(&aufs_fs_type);
+	au_cache_fin();
+	au_sysrq_fin();
+	au_hnotify_fin();
+	au_loopback_fin();
+	au_wkq_fin();
+	au_procfs_fin();
+	sysaufs_fin();
+	au_dy_fin();
+}
+
+module_init(aufs_init);
+module_exit(aufs_exit);