[PATCH 24/67] aufs sub-VFS, header

[hooanon05@yahoo.co.jp]

From: Junjiro Okajima <hooanon05@yahoo.co.jp>

	initial commit
	aufs sub-VFS, header

Signed-off-by: Junjiro Okajima <hooanon05@yahoo.co.jp>
---
 fs/aufs/vfsub.h |  493 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 493 insertions(+), 0 deletions(-)

diff --git a/fs/aufs/vfsub.h b/fs/aufs/vfsub.h
new file mode 100644
index 0000000..a7852bb
--- /dev/null
+++ b/fs/aufs/vfsub.h
@@ -0,0 +1,493 @@
+/*
+ * Copyright (C) 2007-2008 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
+ */
+
+/*
+ * sub-routines for VFS
+ *
+ * $Id: vfsub.h,v 1.2 2008/04/21 01:49:22 sfjro Exp $
+ */
+
+#ifndef __AUFS_VFSUB_H__
+#define __AUFS_VFSUB_H__
+
+#ifdef __KERNEL__
+
+#include <linux/fs.h>
+#include <linux/namei.h>
+#include <linux/splice.h>
+#include <linux/inotify.h>
+
+/* ---------------------------------------------------------------------- */
+
+/* vfsub flags */
+#define Vfsub_DLGT		1		/* operation with delegation */
+#define Vfsub_FORCE_UNLINK	(1 << 1)	/* force unlinking */
+#define vfsub_ftest(flags, name)	((flags) & Vfsub_##name)
+#define vfsub_fset(flags, name)		{ (flags) |= Vfsub_##name; }
+#define vfsub_fclr(flags, name)		{ (flags) &= ~Vfsub_##name; }
+#ifndef CONFIG_AUFS_DLGT
+#undef Vfsub_DLGT
+#define Vfsub_DLGT	0
+#endif
+
+struct au_hin_ignore;
+struct vfsub_args {
+#ifdef CONFIG_AUFS_HINOTIFY
+	/* inotify events to be ignored */
+	int			nignore;
+	struct au_hin_ignore	*ignore;
+#endif
+
+	unsigned int		flags;
+};
+
+struct au_hinode;
+#ifdef CONFIG_AUFS_HINOTIFY
+static inline
+void do_vfsub_args_reinit(struct vfsub_args *vargs, struct au_hin_ignore *ign)
+{
+	vargs->nignore = 0;
+	vargs->ignore = ign;
+}
+
+static inline void vfsub_args_reinit(struct vfsub_args *vargs)
+{
+	vargs->nignore = 0;
+}
+
+__u32 vfsub_events_notify_change(struct iattr *ia);
+void vfsub_ign_hinode(struct vfsub_args *vargs, __u32 events,
+		      struct au_hinode *hinode);
+void vfsub_ign_inode(struct vfsub_args *vargs, __u32 events,
+		     struct inode *inode, struct inode *h_inode);
+
+void vfsub_ignore(struct vfsub_args *vargs);
+void vfsub_unignore(struct vfsub_args *vargs);
+#else
+static inline
+void do_vfsub_args_reinit(struct vfsub_args *vargs, struct au_hin_ignore *ign)
+{
+	/* empty */
+}
+
+static inline void vfsub_args_reinit(struct vfsub_args *vargs)
+{
+	/* empty */
+}
+
+static inline __u32 vfsub_events_notify_change(struct iattr *ia)
+{
+	return 0;
+}
+
+static inline void vfsub_ign_hinode(struct vfsub_args *vargs, __u32 events,
+				    struct au_hinode *hinode)
+{
+	/* empty */
+}
+
+static inline void vfsub_ign_inode(struct vfsub_args *vargs, __u32 events,
+				   struct inode *inode, struct inode *h_inode)
+{
+	/* empty */
+}
+
+static inline void vfsub_ignore(struct vfsub_args *vargs)
+{
+	/* empty */
+}
+
+static inline void vfsub_unignore(struct vfsub_args *vargs)
+{
+	/* empty */
+}
+#endif /* CONFIG_AUFS_HINOTIFY */
+
+void vfsub_args_init(struct vfsub_args *vargs, struct au_hin_ignore *ign,
+		     int dlgt, int force_unlink);
+
+/* ---------------------------------------------------------------------- */
+
+/* inotify_inode_watched() is not exported */
+static inline int au_test_inotify(struct inode *inode)
+{
+#ifdef CONFIG_INOTIFY
+	return !list_empty(&inode->inotify_watches);
+#endif
+	return 0;
+}
+
+/* ---------------------------------------------------------------------- */
+
+/* lock subclass for hidden inode */
+/* default MAX_LOCKDEP_SUBCLASSES(8) is not enough */
+// todo: reduce it
+enum {
+	AuLsc_I_Begin = I_MUTEX_QUOTA, /* 4 */
+	AuLsc_I_PARENT,		/* hidden inode, parent first */
+	AuLsc_I_CHILD,
+	AuLsc_I_PARENT2,	/* copyup dirs */
+	AuLsc_I_CHILD2,
+	AuLsc_I_End
+};
+
+#define IMustLock(i)	MtxMustLock(&(i)->i_mutex)
+
+static inline
+struct dentry *vfsub_lock_rename(struct dentry *d1, struct dentry *d2)
+{
+	struct dentry *d;
+
+	lockdep_off();
+	d = lock_rename(d1, d2);
+	lockdep_on();
+	return d;
+}
+
+static inline void vfsub_unlock_rename(struct dentry *d1, struct dentry *d2)
+{
+	lockdep_off();
+	unlock_rename(d1, d2);
+	lockdep_on();
+}
+
+/* ---------------------------------------------------------------------- */
+
+#ifdef CONFIG_AUFS_WORKAROUND_FUSE
+/* br_fuse.c */
+int au_update_fuse_h_inode(struct vfsmount *h_mnt, struct dentry *h_dentry);
+#else
+static inline
+int au_update_fuse_h_inode(struct vfsmount *h_mnt, struct dentry *h_dentry)
+{
+	return 0;
+}
+#endif
+
+#ifdef CONFIG_AUFS_BR_XFS
+/* br_xfs.c */
+dev_t au_h_rdev(struct inode *h_inode, struct vfsmount *h_mnt,
+		struct dentry *h_dentry);
+#else
+static inline
+dev_t au_h_rdev(struct inode *h_inode, struct vfsmount *h_mnt,
+		struct dentry *h_dentry)
+{
+	return h_inode->i_rdev;
+}
+#endif
+
+/* simple abstractions, for future use */
+static inline
+int do_vfsub_permission(struct inode *inode, int mask, struct nameidata *nd)
+{
+	LKTRTrace("i%lu, mask 0x%x, nd %d\n", inode->i_ino, mask, !!nd);
+	IMustLock(inode);
+	return permission(inode, mask, nd);
+}
+
+/* ---------------------------------------------------------------------- */
+
+struct file *vfsub_filp_open(const char *path, int oflags, int mode);
+int vfsub_path_lookup(const char *name, unsigned int flags,
+		      struct nameidata *nd);
+struct dentry *vfsub_lookup_one_len(const char *name, struct dentry *parent,
+				    int len);
+
+#ifdef CONFIG_AUFS_LHASH_PATCH
+struct dentry *vfsub__lookup_hash(struct qstr *name, struct dentry *parent,
+				  struct nameidata *nd);
+#endif
+
+/* ---------------------------------------------------------------------- */
+
+int do_vfsub_create(struct inode *dir, struct dentry *dentry, int mode,
+		    struct nameidata *nd);
+int do_vfsub_symlink(struct inode *dir, struct dentry *dentry,
+		     const char *symname, int mode);
+int do_vfsub_mknod(struct inode *dir, struct dentry *dentry, int mode,
+		   dev_t dev);
+int do_vfsub_link(struct dentry *src_dentry, struct inode *dir,
+		  struct dentry *dentry);
+int do_vfsub_rename(struct inode *src_dir, struct dentry *src_dentry,
+		    struct inode *dir, struct dentry *dentry);
+int do_vfsub_mkdir(struct inode *dir, struct dentry *dentry, int mode);
+int do_vfsub_rmdir(struct inode *dir, struct dentry *dentry);
+int do_vfsub_unlink(struct inode *dir, struct dentry *dentry);
+
+/* ---------------------------------------------------------------------- */
+
+ssize_t do_vfsub_read_u(struct file *file, char __user *ubuf, size_t count,
+			loff_t *ppos);
+// kernel_read() ??
+ssize_t do_vfsub_read_k(struct file *file, void *kbuf, size_t count,
+			loff_t *ppos);
+ssize_t do_vfsub_write_u(struct file *file, const char __user *ubuf,
+			 size_t count, loff_t *ppos);
+ssize_t do_vfsub_write_k(struct file *file, void *kbuf, size_t count,
+			 loff_t *ppos);
+int do_vfsub_readdir(struct file *file, filldir_t filldir, void *arg);
+
+/* ---------------------------------------------------------------------- */
+
+#ifdef CONFIG_AUFS_SPLICE_PATCH
+long do_vfsub_splice_to(struct file *in, loff_t *ppos,
+			struct pipe_inode_info *pipe, size_t len,
+			unsigned int flags);
+long do_vfsub_splice_from(struct pipe_inode_info *pipe, struct file *out,
+			  loff_t *ppos, size_t len, unsigned int flags);
+#else
+static inline
+long do_vfsub_splice_to(struct file *in, loff_t *ppos,
+			struct pipe_inode_info *pipe, size_t len,
+			unsigned int flags)
+{
+	return -ENOSYS;
+}
+
+static inline
+long do_vfsub_splice_from(struct pipe_inode_info *pipe, struct file *out,
+			  loff_t *ppos, size_t len, unsigned int flags)
+{
+	return -ENOSYS;
+}
+#endif /* CONFIG_AUFS_SPLICE_PATCH */
+
+/* ---------------------------------------------------------------------- */
+
+static inline loff_t vfsub_llseek(struct file *file, loff_t offset, int origin)
+{
+	loff_t err;
+
+	LKTRTrace("%.*s\n", AuDLNPair(file->f_dentry));
+
+	lockdep_off();
+	err = vfs_llseek(file, offset, origin);
+	lockdep_on();
+	return err;
+}
+
+static inline int do_vfsub_getattr(struct vfsmount *mnt, struct dentry *dentry,
+				   struct kstat *st)
+{
+	LKTRTrace("%.*s\n", AuDLNPair(dentry));
+	return vfs_getattr(mnt, dentry, st);
+}
+
+/* ---------------------------------------------------------------------- */
+
+#if defined(CONFIG_AUFS_HINOTIFY) || defined(CONFIG_AUFS_DLGT)
+/* hin_or_dlgt.c */
+int vfsub_permission(struct inode *inode, int mask, struct nameidata *nd,
+		     int dlgt);
+
+int vfsub_create(struct inode *dir, struct dentry *dentry, int mode,
+		 struct nameidata *nd, int dlgt);
+int vfsub_symlink(struct inode *dir, struct dentry *dentry, const char *symname,
+		  int mode, int dlgt);
+int vfsub_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev,
+		int dlgt);
+int vfsub_link(struct dentry *src_dentry, struct inode *dir,
+	       struct dentry *dentry, int dlgt);
+int vfsub_rename(struct inode *src_dir, struct dentry *src_dentry,
+		 struct inode *dir, struct dentry *dentry,
+		 struct vfsub_args *vargs);
+int vfsub_mkdir(struct inode *dir, struct dentry *dentry, int mode, int dlgt);
+int vfsub_rmdir(struct inode *dir, struct dentry *dentry,
+		struct vfsub_args *vargs);
+
+ssize_t vfsub_read_u(struct file *file, char __user *ubuf, size_t count,
+		     loff_t *ppos, int dlgt);
+ssize_t vfsub_read_k(struct file *file, void *kbuf, size_t count, loff_t *ppos,
+		     int dlgt);
+ssize_t vfsub_write_u(struct file *file, const char __user *ubuf, size_t count,
+		      loff_t *ppos, struct vfsub_args *vargs);
+ssize_t vfsub_write_k(struct file *file, void *kbuf, size_t count, loff_t *ppos,
+		      struct vfsub_args *vargs);
+int vfsub_readdir(struct file *file, filldir_t filldir, void *arg, int dlgt);
+long vfsub_splice_to(struct file *in, loff_t *ppos,
+		     struct pipe_inode_info *pipe, size_t len,
+		     unsigned int flags, int dlgt);
+long vfsub_splice_from(struct pipe_inode_info *pipe, struct file *out,
+		       loff_t *ppos, size_t len, unsigned int flags,
+		       struct vfsub_args *vargs);
+
+int vfsub_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *st,
+		  int dlgt);
+#else
+
+static inline
+int vfsub_permission(struct inode *inode, int mask, struct nameidata *nd,
+		     int dlgt)
+{
+	return do_vfsub_permission(inode, mask, nd);
+}
+
+static inline
+int vfsub_create(struct inode *dir, struct dentry *dentry, int mode,
+		 struct nameidata *nd, int dlgt)
+{
+	return do_vfsub_create(dir, dentry, mode, nd);
+}
+
+static inline
+int vfsub_symlink(struct inode *dir, struct dentry *dentry, const char *symname,
+		  int mode, int dlgt)
+{
+	return do_vfsub_symlink(dir, dentry, symname, mode);
+}
+
+static inline
+int vfsub_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev,
+		int dlgt)
+{
+	return do_vfsub_mknod(dir, dentry, mode, dev);
+}
+
+static inline
+int vfsub_link(struct dentry *src_dentry, struct inode *dir,
+	       struct dentry *dentry, int dlgt)
+{
+	return do_vfsub_link(src_dentry, dir, dentry);
+}
+
+static inline
+int vfsub_rename(struct inode *src_dir, struct dentry *src_dentry,
+		 struct inode *dir, struct dentry *dentry,
+		 struct vfsub_args *vargs)
+{
+	int err;
+
+	vfsub_ignore(vargs);
+	err = do_vfsub_rename(src_dir, src_dentry, dir, dentry);
+	if (unlikely(err))
+		vfsub_unignore(vargs);
+	return err;
+}
+
+static inline
+int vfsub_mkdir(struct inode *dir, struct dentry *dentry, int mode, int dlgt)
+{
+	return do_vfsub_mkdir(dir, dentry, mode);
+}
+
+static inline
+int vfsub_rmdir(struct inode *dir, struct dentry *dentry,
+		struct vfsub_args *vargs)
+{
+	int err;
+
+	vfsub_ignore(vargs);
+	err = do_vfsub_rmdir(dir, dentry);
+	if (unlikely(err))
+		vfsub_unignore(vargs);
+	return err;
+}
+
+static inline
+ssize_t vfsub_read_u(struct file *file, char __user *ubuf, size_t count,
+		     loff_t *ppos, int dlgt)
+{
+	return do_vfsub_read_u(file, ubuf, count, ppos);
+}
+
+static inline
+ssize_t vfsub_read_k(struct file *file, void *kbuf, size_t count, loff_t *ppos,
+		     int dlgt)
+{
+	return do_vfsub_read_k(file, kbuf, count, ppos);
+}
+
+static inline
+ssize_t vfsub_write_u(struct file *file, const char __user *ubuf, size_t count,
+		      loff_t *ppos, struct vfsub_args *vargs)
+{
+	int err;
+
+	vfsub_ignore(vargs);
+	err = do_vfsub_write_u(file, ubuf, count, ppos);
+	if (unlikely(err < 0))
+		vfsub_unignore(vargs);
+	return err;
+}
+
+static inline
+ssize_t vfsub_write_k(struct file *file, void *kbuf, size_t count, loff_t *ppos,
+		      struct vfsub_args *vargs)
+{
+	int err;
+
+	vfsub_ignore(vargs);
+	err = do_vfsub_write_k(file, kbuf, count, ppos);
+	if (unlikely(err < 0))
+		vfsub_unignore(vargs);
+	return err;
+}
+
+static inline
+int vfsub_readdir(struct file *file, filldir_t filldir, void *arg, int dlgt)
+{
+	return do_vfsub_readdir(file, filldir, arg);
+}
+
+static inline
+long vfsub_splice_to(struct file *in, loff_t *ppos,
+		     struct pipe_inode_info *pipe, size_t len,
+		     unsigned int flags, int dlgt)
+{
+	return do_vfsub_splice_to(in, ppos, pipe, len, flags);
+}
+
+static inline
+long vfsub_splice_from(struct pipe_inode_info *pipe, struct file *out,
+		       loff_t *ppos, size_t len, unsigned int flags,
+		       struct vfsub_args *vargs)
+{
+	long err;
+
+	vfsub_ignore(vargs);
+	err = do_vfsub_splice_from(pipe, out, ppos, len, flags);
+	if (unlikely(err < 0))
+		vfsub_unignore(vargs);
+	return err;
+}
+
+static inline
+int vfsub_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *st,
+		  int dlgt)
+{
+	return do_vfsub_getattr(mnt, dentry, st);
+}
+#endif /* CONFIG_AUFS_DLGT || CONFIG_AUFS_HINOTIFY */
+
+/* ---------------------------------------------------------------------- */
+
+int vfsub_sio_mkdir(struct inode *dir, struct dentry *dentry, int mode,
+		    int dlgt);
+int vfsub_sio_rmdir(struct inode *dir, struct dentry *dentry, int dlgt);
+
+/* ---------------------------------------------------------------------- */
+
+int vfsub_notify_change(struct dentry *dentry, struct iattr *ia,
+			struct vfsub_args *vargs);
+int vfsub_unlink(struct inode *dir, struct dentry *dentry,
+		 struct vfsub_args *vargs);
+int vfsub_statfs(void *arg, struct kstatfs *buf, int dlgt);
+
+#endif /* __KERNEL__ */
+#endif /* __AUFS_VFSUB_H__ */
-- 
1.4.4.4