fs/nilfs2/nilfs.h - LeafOS-Devices/android_kernel_realme_mt6785 - Gitiles

 /*
  * nilfs.h - NILFS local header file.
  *
  * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
  *
  * This program 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.
  *
  * Written by Koji Sato and Ryusuke Konishi.
  */

 #ifndef _NILFS_H
 #define _NILFS_H

 #include <linux/kernel.h>
 #include <linux/buffer_head.h>
 #include <linux/spinlock.h>
 #include <linux/blkdev.h>
 #include <linux/nilfs2_api.h>
 #include <linux/nilfs2_ondisk.h>
 #include "the_nilfs.h"
 #include "bmap.h"

 /**
  * struct nilfs_inode_info - nilfs inode data in memory
  * @i_flags: inode flags
  * @i_state: dynamic state flags
  * @i_bmap: pointer on i_bmap_data
  * @i_bmap_data: raw block mapping
  * @i_xattr: <TODO>
  * @i_dir_start_lookup: page index of last successful search
  * @i_cno: checkpoint number for GC inode
  * @i_assoc_inode: associated inode (B-tree node cache holder or back pointer)
  * @i_dirty: list for connecting dirty files
  * @xattr_sem: semaphore for extended attributes processing
  * @i_bh: buffer contains disk inode
  * @i_root: root object of the current filesystem tree
  * @vfs_inode: VFS inode object
  */
 struct nilfs_inode_info {
 	__u32 i_flags;
 	unsigned long  i_state;		/* Dynamic state flags */
 	struct nilfs_bmap *i_bmap;
 	struct nilfs_bmap i_bmap_data;
 	__u64 i_xattr;	/* sector_t ??? */
 	__u32 i_dir_start_lookup;
 	__u64 i_cno;		/* check point number for GC inode */
 	struct inode *i_assoc_inode;
 	struct list_head i_dirty;	/* List for connecting dirty files */

 #ifdef CONFIG_NILFS_XATTR
 	/*
 	 * Extended attributes can be read independently of the main file
 	 * data. Taking i_sem even when reading would cause contention
 	 * between readers of EAs and writers of regular file data, so
 	 * instead we synchronize on xattr_sem when reading or changing
 	 * EAs.
 	 */
 	struct rw_semaphore xattr_sem;
 #endif
 	struct buffer_head *i_bh;	/*
 					 * i_bh contains a new or dirty
 					 * disk inode.
 					 */
 	struct nilfs_root *i_root;
 	struct inode vfs_inode;
 };

 static inline struct nilfs_inode_info *NILFS_I(const struct inode *inode)
 {
 	return container_of(inode, struct nilfs_inode_info, vfs_inode);
 }

 static inline struct nilfs_inode_info *
 NILFS_BMAP_I(const struct nilfs_bmap *bmap)
 {
 	return container_of(bmap, struct nilfs_inode_info, i_bmap_data);
 }

 /*
  * Dynamic state flags of NILFS on-memory inode (i_state)
  */
 enum {
 	NILFS_I_NEW = 0,		/* Inode is newly created */
 	NILFS_I_DIRTY,			/* The file is dirty */
 	NILFS_I_QUEUED,			/* inode is in dirty_files list */
 	NILFS_I_BUSY,			/*
 					 * Inode is grabbed by a segment
 					 * constructor
 					 */
 	NILFS_I_COLLECTED,		/* All dirty blocks are collected */
 	NILFS_I_UPDATED,		/* The file has been written back */
 	NILFS_I_INODE_SYNC,		/* dsync is not allowed for inode */
 	NILFS_I_BMAP,			/* has bmap and btnode_cache */
 	NILFS_I_GCINODE,		/* inode for GC, on memory only */
 	NILFS_I_BTNC,			/* inode for btree node cache */
 	NILFS_I_SHADOW,			/* inode for shadowed page cache */
 };

 /*
  * commit flags for nilfs_commit_super and nilfs_sync_super
  */
 enum {
 	NILFS_SB_COMMIT = 0,	/* Commit a super block alternately */
 	NILFS_SB_COMMIT_ALL	/* Commit both super blocks */
 };

 /*
  * Macros to check inode numbers
  */
 #define NILFS_MDT_INO_BITS						\
 	(BIT(NILFS_DAT_INO) | BIT(NILFS_CPFILE_INO) |			\
 	 BIT(NILFS_SUFILE_INO) | BIT(NILFS_IFILE_INO) |			\
 	 BIT(NILFS_ATIME_INO) | BIT(NILFS_SKETCH_INO))

 #define NILFS_SYS_INO_BITS (BIT(NILFS_ROOT_INO) | NILFS_MDT_INO_BITS)

 #define NILFS_FIRST_INO(sb) (((struct the_nilfs *)sb->s_fs_info)->ns_first_ino)

 #define NILFS_MDT_INODE(sb, ino) \
 	((ino) < NILFS_FIRST_INO(sb) && (NILFS_MDT_INO_BITS & BIT(ino)))
 #define NILFS_VALID_INODE(sb, ino) \
 	((ino) >= NILFS_FIRST_INO(sb) || (NILFS_SYS_INO_BITS & BIT(ino)))

 /**
  * struct nilfs_transaction_info: context information for synchronization
  * @ti_magic: Magic number
  * @ti_save: Backup of journal_info field of task_struct
  * @ti_flags: Flags
  * @ti_count: Nest level
  */
 struct nilfs_transaction_info {
 	u32			ti_magic;
 	void		       *ti_save;
 				/*
 				 * This should never be used.  If it happens,
 				 * one of other filesystems has a bug.
 				 */
 	unsigned short		ti_flags;
 	unsigned short		ti_count;
 };

 /* ti_magic */
 #define NILFS_TI_MAGIC		0xd9e392fb

 /* ti_flags */
 #define NILFS_TI_DYNAMIC_ALLOC	0x0001  /* Allocated from slab */
 #define NILFS_TI_SYNC		0x0002	/*
 					 * Force to construct segment at the
 					 * end of transaction.
 					 */
 #define NILFS_TI_GC		0x0004	/* GC context */
 #define NILFS_TI_COMMIT		0x0008	/* Change happened or not */
 #define NILFS_TI_WRITER		0x0010	/* Constructor context */


 int nilfs_transaction_begin(struct super_block *,
 			    struct nilfs_transaction_info *, int);
 int nilfs_transaction_commit(struct super_block *);
 void nilfs_transaction_abort(struct super_block *);

 static inline void nilfs_set_transaction_flag(unsigned int flag)
 {
 	struct nilfs_transaction_info *ti = current->journal_info;

 	ti->ti_flags |= flag;
 }

 static inline int nilfs_test_transaction_flag(unsigned int flag)
 {
 	struct nilfs_transaction_info *ti = current->journal_info;

 	if (ti == NULL || ti->ti_magic != NILFS_TI_MAGIC)
 		return 0;
 	return !!(ti->ti_flags & flag);
 }

 static inline int nilfs_doing_gc(void)
 {
 	return nilfs_test_transaction_flag(NILFS_TI_GC);
 }

 static inline int nilfs_doing_construction(void)
 {
 	return nilfs_test_transaction_flag(NILFS_TI_WRITER);
 }

 /*
  * function prototype
  */
 #ifdef CONFIG_NILFS_POSIX_ACL
 #error "NILFS: not yet supported POSIX ACL"
 extern int nilfs_acl_chmod(struct inode *);
 extern int nilfs_init_acl(struct inode *, struct inode *);
 #else
 static inline int nilfs_acl_chmod(struct inode *inode)
 {
 	return 0;
 }

 static inline int nilfs_init_acl(struct inode *inode, struct inode *dir)
 {
 	if (S_ISLNK(inode->i_mode))
 		return 0;

 	inode->i_mode &= ~current_umask();
 	return 0;
 }
 #endif

 #define NILFS_ATIME_DISABLE

 /* Flags that should be inherited by new inodes from their parent. */
 #define NILFS_FL_INHERITED						\
 	(FS_SECRM_FL | FS_UNRM_FL | FS_COMPR_FL | FS_SYNC_FL |		\
 	 FS_IMMUTABLE_FL | FS_APPEND_FL | FS_NODUMP_FL | FS_NOATIME_FL |\
 	 FS_COMPRBLK_FL | FS_NOCOMP_FL | FS_NOTAIL_FL | FS_DIRSYNC_FL)

 /* Mask out flags that are inappropriate for the given type of inode. */
 static inline __u32 nilfs_mask_flags(umode_t mode, __u32 flags)
 {
 	if (S_ISDIR(mode))
 		return flags;
 	else if (S_ISREG(mode))
 		return flags & ~(FS_DIRSYNC_FL | FS_TOPDIR_FL);
 	else
 		return flags & (FS_NODUMP_FL | FS_NOATIME_FL);
 }

 /* dir.c */
 extern int nilfs_add_link(struct dentry *, struct inode *);
 extern ino_t nilfs_inode_by_name(struct inode *, const struct qstr *);
 extern int nilfs_make_empty(struct inode *, struct inode *);
 extern struct nilfs_dir_entry *
 nilfs_find_entry(struct inode *, const struct qstr *, struct page **);
 extern int nilfs_delete_entry(struct nilfs_dir_entry *, struct page *);
 extern int nilfs_empty_dir(struct inode *);
 extern struct nilfs_dir_entry *nilfs_dotdot(struct inode *, struct page **);
 extern void nilfs_set_link(struct inode *, struct nilfs_dir_entry *,
 			   struct page *, struct inode *);

 /* file.c */
 extern int nilfs_sync_file(struct file *, loff_t, loff_t, int);

 /* ioctl.c */
 long nilfs_ioctl(struct file *, unsigned int, unsigned long);
 long nilfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
 int nilfs_ioctl_prepare_clean_segments(struct the_nilfs *, struct nilfs_argv *,
 				       void **);

 /* inode.c */
 void nilfs_inode_add_blocks(struct inode *inode, int n);
 void nilfs_inode_sub_blocks(struct inode *inode, int n);
 extern struct inode *nilfs_new_inode(struct inode *, umode_t);
 extern void nilfs_free_inode(struct inode *);
 extern int nilfs_get_block(struct inode *, sector_t, struct buffer_head *, int);
 extern void nilfs_set_inode_flags(struct inode *);
 extern int nilfs_read_inode_common(struct inode *, struct nilfs_inode *);
 extern void nilfs_write_inode_common(struct inode *, struct nilfs_inode *, int);
 struct inode *nilfs_ilookup(struct super_block *sb, struct nilfs_root *root,
 			    unsigned long ino);
 struct inode *nilfs_iget_locked(struct super_block *sb, struct nilfs_root *root,
 				unsigned long ino);
 struct inode *nilfs_iget(struct super_block *sb, struct nilfs_root *root,
 			 unsigned long ino);
 extern struct inode *nilfs_iget_for_gc(struct super_block *sb,
 				       unsigned long ino, __u64 cno);
 int nilfs_attach_btree_node_cache(struct inode *inode);
 void nilfs_detach_btree_node_cache(struct inode *inode);
 struct inode *nilfs_iget_for_shadow(struct inode *inode);
 extern void nilfs_update_inode(struct inode *, struct buffer_head *, int);
 extern void nilfs_truncate(struct inode *);
 extern void nilfs_evict_inode(struct inode *);
 extern int nilfs_setattr(struct dentry *, struct iattr *);
 extern void nilfs_write_failed(struct address_space *mapping, loff_t to);
 int nilfs_permission(struct inode *inode, int mask);
 int nilfs_load_inode_block(struct inode *inode, struct buffer_head **pbh);
 extern int nilfs_inode_dirty(struct inode *);
 int nilfs_set_file_dirty(struct inode *inode, unsigned int nr_dirty);
 extern int __nilfs_mark_inode_dirty(struct inode *, int);
 extern void nilfs_dirty_inode(struct inode *, int flags);
 int nilfs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
 		 __u64 start, __u64 len);
 static inline int nilfs_mark_inode_dirty(struct inode *inode)
 {
 	return __nilfs_mark_inode_dirty(inode, I_DIRTY);
 }
 static inline int nilfs_mark_inode_dirty_sync(struct inode *inode)
 {
 	return __nilfs_mark_inode_dirty(inode, I_DIRTY_SYNC);
 }

 /* super.c */
 extern struct inode *nilfs_alloc_inode(struct super_block *);
 extern void nilfs_destroy_inode(struct inode *);

 extern __printf(3, 4)
 void __nilfs_msg(struct super_block *sb, const char *level,
 		 const char *fmt, ...);
 extern __printf(3, 4)
 void __nilfs_error(struct super_block *sb, const char *function,
 		   const char *fmt, ...);

 #ifdef CONFIG_PRINTK

 #define nilfs_msg(sb, level, fmt, ...)					\
 	__nilfs_msg(sb, level, fmt, ##__VA_ARGS__)
 #define nilfs_error(sb, fmt, ...)					\
 	__nilfs_error(sb, __func__, fmt, ##__VA_ARGS__)

 #else

 #define nilfs_msg(sb, level, fmt, ...)					\
 	do {								\
 		no_printk(fmt, ##__VA_ARGS__);				\
 		(void)(sb);						\
 	} while (0)
 #define nilfs_error(sb, fmt, ...)					\
 	do {								\
 		no_printk(fmt, ##__VA_ARGS__);				\
 		__nilfs_error(sb, "", " ");				\
 	} while (0)

 #endif /* CONFIG_PRINTK */

 extern struct nilfs_super_block *
 nilfs_read_super_block(struct super_block *, u64, int, struct buffer_head **);
 extern int nilfs_store_magic_and_option(struct super_block *,
 					struct nilfs_super_block *, char *);
 extern int nilfs_check_feature_compatibility(struct super_block *,
 					     struct nilfs_super_block *);
 extern void nilfs_set_log_cursor(struct nilfs_super_block *,
 				 struct the_nilfs *);
 struct nilfs_super_block **nilfs_prepare_super(struct super_block *sb,
 					       int flip);
 int nilfs_commit_super(struct super_block *sb, int flag);
 int nilfs_cleanup_super(struct super_block *sb);
 int nilfs_resize_fs(struct super_block *sb, __u64 newsize);
 int nilfs_attach_checkpoint(struct super_block *sb, __u64 cno, int curr_mnt,
 			    struct nilfs_root **root);
 int nilfs_checkpoint_is_mounted(struct super_block *sb, __u64 cno);

 /* gcinode.c */
 int nilfs_gccache_submit_read_data(struct inode *, sector_t, sector_t, __u64,
 				   struct buffer_head **);
 int nilfs_gccache_submit_read_node(struct inode *, sector_t, __u64,
 				   struct buffer_head **);
 int nilfs_gccache_wait_and_mark_dirty(struct buffer_head *);
 int nilfs_init_gcinode(struct inode *inode);
 void nilfs_remove_all_gcinodes(struct the_nilfs *nilfs);

 /* sysfs.c */
 int __init nilfs_sysfs_init(void);
 void nilfs_sysfs_exit(void);
 int nilfs_sysfs_create_device_group(struct super_block *);
 void nilfs_sysfs_delete_device_group(struct the_nilfs *);
 int nilfs_sysfs_create_snapshot_group(struct nilfs_root *);
 void nilfs_sysfs_delete_snapshot_group(struct nilfs_root *);

 /*
  * Inodes and files operations
  */
 extern const struct file_operations nilfs_dir_operations;
 extern const struct inode_operations nilfs_file_inode_operations;
 extern const struct file_operations nilfs_file_operations;
 extern const struct address_space_operations nilfs_aops;
 extern const struct inode_operations nilfs_dir_inode_operations;
 extern const struct inode_operations nilfs_special_inode_operations;
 extern const struct inode_operations nilfs_symlink_inode_operations;

 /*
  * filesystem type
  */
 extern struct file_system_type nilfs_fs_type;


 #endif	/* _NILFS_H */
	/*
	* nilfs.h - NILFS local header file.
	*
	* Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
	*
	* This program 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.
	*
	* Written by Koji Sato and Ryusuke Konishi.
	*/

	#ifndef _NILFS_H
	#define _NILFS_H

	#include <linux/kernel.h>
	#include <linux/buffer_head.h>
	#include <linux/spinlock.h>
	#include <linux/blkdev.h>
	#include <linux/nilfs2_api.h>
	#include <linux/nilfs2_ondisk.h>
	#include "the_nilfs.h"
	#include "bmap.h"

	/**
	* struct nilfs_inode_info - nilfs inode data in memory
	* @i_flags: inode flags
	* @i_state: dynamic state flags
	* @i_bmap: pointer on i_bmap_data
	* @i_bmap_data: raw block mapping
	* @i_xattr: <TODO>
	* @i_dir_start_lookup: page index of last successful search
	* @i_cno: checkpoint number for GC inode
	* @i_assoc_inode: associated inode (B-tree node cache holder or back pointer)
	* @i_dirty: list for connecting dirty files
	* @xattr_sem: semaphore for extended attributes processing
	* @i_bh: buffer contains disk inode
	* @i_root: root object of the current filesystem tree
	* @vfs_inode: VFS inode object
	*/
	struct nilfs_inode_info {
	__u32 i_flags;
	unsigned long i_state; /* Dynamic state flags */
	struct nilfs_bmap *i_bmap;
	struct nilfs_bmap i_bmap_data;
	__u64 i_xattr; /* sector_t ??? */
	__u32 i_dir_start_lookup;
	__u64 i_cno; /* check point number for GC inode */
	struct inode *i_assoc_inode;
	struct list_head i_dirty; /* List for connecting dirty files */

	#ifdef CONFIG_NILFS_XATTR
	/*
	* Extended attributes can be read independently of the main file
	* data. Taking i_sem even when reading would cause contention
	* between readers of EAs and writers of regular file data, so
	* instead we synchronize on xattr_sem when reading or changing
	* EAs.
	*/
	struct rw_semaphore xattr_sem;
	#endif
	struct buffer_head i_bh; /
	* i_bh contains a new or dirty
	* disk inode.
	*/
	struct nilfs_root *i_root;
	struct inode vfs_inode;
	};

	static inline struct nilfs_inode_info NILFS_I(const struct inode inode)
	{
	return container_of(inode, struct nilfs_inode_info, vfs_inode);
	}

	static inline struct nilfs_inode_info *
	NILFS_BMAP_I(const struct nilfs_bmap *bmap)
	{
	return container_of(bmap, struct nilfs_inode_info, i_bmap_data);
	}

	/*
	* Dynamic state flags of NILFS on-memory inode (i_state)
	*/
	enum {
	NILFS_I_NEW = 0, /* Inode is newly created */
	NILFS_I_DIRTY, /* The file is dirty */
	NILFS_I_QUEUED, /* inode is in dirty_files list */
	NILFS_I_BUSY, /*
	* Inode is grabbed by a segment
	* constructor
	*/
	NILFS_I_COLLECTED, /* All dirty blocks are collected */
	NILFS_I_UPDATED, /* The file has been written back */
	NILFS_I_INODE_SYNC, /* dsync is not allowed for inode */
	NILFS_I_BMAP, /* has bmap and btnode_cache */
	NILFS_I_GCINODE, /* inode for GC, on memory only */
	NILFS_I_BTNC, /* inode for btree node cache */
	NILFS_I_SHADOW, /* inode for shadowed page cache */
	};

	/*
	* commit flags for nilfs_commit_super and nilfs_sync_super
	*/
	enum {
	NILFS_SB_COMMIT = 0, /* Commit a super block alternately */
	NILFS_SB_COMMIT_ALL /* Commit both super blocks */
	};

	/*
	* Macros to check inode numbers
	*/
	#define NILFS_MDT_INO_BITS \
	(BIT(NILFS_DAT_INO) \| BIT(NILFS_CPFILE_INO) \| \
	BIT(NILFS_SUFILE_INO) \| BIT(NILFS_IFILE_INO) \| \
	BIT(NILFS_ATIME_INO) \| BIT(NILFS_SKETCH_INO))

	#define NILFS_SYS_INO_BITS (BIT(NILFS_ROOT_INO) \| NILFS_MDT_INO_BITS)

	#define NILFS_FIRST_INO(sb) (((struct the_nilfs *)sb->s_fs_info)->ns_first_ino)

	#define NILFS_MDT_INODE(sb, ino) \
	((ino) < NILFS_FIRST_INO(sb) && (NILFS_MDT_INO_BITS & BIT(ino)))
	#define NILFS_VALID_INODE(sb, ino) \
	((ino) >= NILFS_FIRST_INO(sb) \|\| (NILFS_SYS_INO_BITS & BIT(ino)))

	/**
	* struct nilfs_transaction_info: context information for synchronization
	* @ti_magic: Magic number
	* @ti_save: Backup of journal_info field of task_struct
	* @ti_flags: Flags
	* @ti_count: Nest level
	*/
	struct nilfs_transaction_info {
	u32 ti_magic;
	void *ti_save;
	/*
	* This should never be used. If it happens,
	* one of other filesystems has a bug.
	*/
	unsigned short ti_flags;
	unsigned short ti_count;
	};

	/* ti_magic */
	#define NILFS_TI_MAGIC 0xd9e392fb

	/* ti_flags */
	#define NILFS_TI_DYNAMIC_ALLOC 0x0001 /* Allocated from slab */
	#define NILFS_TI_SYNC 0x0002 /*
	* Force to construct segment at the
	* end of transaction.
	*/
	#define NILFS_TI_GC 0x0004 /* GC context */
	#define NILFS_TI_COMMIT 0x0008 /* Change happened or not */
	#define NILFS_TI_WRITER 0x0010 /* Constructor context */


	int nilfs_transaction_begin(struct super_block *,
	struct nilfs_transaction_info *, int);
	int nilfs_transaction_commit(struct super_block *);
	void nilfs_transaction_abort(struct super_block *);

	static inline void nilfs_set_transaction_flag(unsigned int flag)
	{
	struct nilfs_transaction_info *ti = current->journal_info;

	ti->ti_flags \|= flag;
	}

	static inline int nilfs_test_transaction_flag(unsigned int flag)
	{
	struct nilfs_transaction_info *ti = current->journal_info;

	if (ti == NULL \|\| ti->ti_magic != NILFS_TI_MAGIC)
	return 0;
	return !!(ti->ti_flags & flag);
	}

	static inline int nilfs_doing_gc(void)
	{
	return nilfs_test_transaction_flag(NILFS_TI_GC);
	}

	static inline int nilfs_doing_construction(void)
	{
	return nilfs_test_transaction_flag(NILFS_TI_WRITER);
	}

	/*
	* function prototype
	*/
	#ifdef CONFIG_NILFS_POSIX_ACL
	#error "NILFS: not yet supported POSIX ACL"
	extern int nilfs_acl_chmod(struct inode *);
	extern int nilfs_init_acl(struct inode , struct inode );
	#else
	static inline int nilfs_acl_chmod(struct inode *inode)
	{
	return 0;
	}

	static inline int nilfs_init_acl(struct inode inode, struct inode dir)
	{
	if (S_ISLNK(inode->i_mode))
	return 0;

	inode->i_mode &= ~current_umask();
	return 0;
	}
	#endif

	#define NILFS_ATIME_DISABLE

	/* Flags that should be inherited by new inodes from their parent. */
	#define NILFS_FL_INHERITED \
	(FS_SECRM_FL \| FS_UNRM_FL \| FS_COMPR_FL \| FS_SYNC_FL \| \
	FS_IMMUTABLE_FL \| FS_APPEND_FL \| FS_NODUMP_FL \| FS_NOATIME_FL \|\
	FS_COMPRBLK_FL \| FS_NOCOMP_FL \| FS_NOTAIL_FL \| FS_DIRSYNC_FL)

	/* Mask out flags that are inappropriate for the given type of inode. */
	static inline __u32 nilfs_mask_flags(umode_t mode, __u32 flags)
	{
	if (S_ISDIR(mode))
	return flags;
	else if (S_ISREG(mode))
	return flags & ~(FS_DIRSYNC_FL \| FS_TOPDIR_FL);
	else
	return flags & (FS_NODUMP_FL \| FS_NOATIME_FL);
	}

	/* dir.c */
	extern int nilfs_add_link(struct dentry , struct inode );
	extern ino_t nilfs_inode_by_name(struct inode , const struct qstr );
	extern int nilfs_make_empty(struct inode , struct inode );
	extern struct nilfs_dir_entry *
	nilfs_find_entry(struct inode , const struct qstr , struct page **);
	extern int nilfs_delete_entry(struct nilfs_dir_entry , struct page );
	extern int nilfs_empty_dir(struct inode *);
	extern struct nilfs_dir_entry nilfs_dotdot(struct inode , struct page **);
	extern void nilfs_set_link(struct inode , struct nilfs_dir_entry ,
	struct page , struct inode );

	/* file.c */
	extern int nilfs_sync_file(struct file *, loff_t, loff_t, int);

	/* ioctl.c */
	long nilfs_ioctl(struct file *, unsigned int, unsigned long);
	long nilfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
	int nilfs_ioctl_prepare_clean_segments(struct the_nilfs , struct nilfs_argv ,
	void **);

	/* inode.c */
	void nilfs_inode_add_blocks(struct inode *inode, int n);
	void nilfs_inode_sub_blocks(struct inode *inode, int n);
	extern struct inode nilfs_new_inode(struct inode , umode_t);
	extern void nilfs_free_inode(struct inode *);
	extern int nilfs_get_block(struct inode , sector_t, struct buffer_head , int);
	extern void nilfs_set_inode_flags(struct inode *);
	extern int nilfs_read_inode_common(struct inode , struct nilfs_inode );
	extern void nilfs_write_inode_common(struct inode , struct nilfs_inode , int);
	struct inode nilfs_ilookup(struct super_block sb, struct nilfs_root *root,
	unsigned long ino);
	struct inode nilfs_iget_locked(struct super_block sb, struct nilfs_root *root,
	unsigned long ino);
	struct inode nilfs_iget(struct super_block sb, struct nilfs_root *root,
	unsigned long ino);
	extern struct inode nilfs_iget_for_gc(struct super_block sb,
	unsigned long ino, __u64 cno);
	int nilfs_attach_btree_node_cache(struct inode *inode);
	void nilfs_detach_btree_node_cache(struct inode *inode);
	struct inode nilfs_iget_for_shadow(struct inode inode);
	extern void nilfs_update_inode(struct inode , struct buffer_head , int);
	extern void nilfs_truncate(struct inode *);
	extern void nilfs_evict_inode(struct inode *);
	extern int nilfs_setattr(struct dentry , struct iattr );
	extern void nilfs_write_failed(struct address_space *mapping, loff_t to);
	int nilfs_permission(struct inode *inode, int mask);
	int nilfs_load_inode_block(struct inode inode, struct buffer_head *pbh);
	extern int nilfs_inode_dirty(struct inode *);
	int nilfs_set_file_dirty(struct inode *inode, unsigned int nr_dirty);
	extern int __nilfs_mark_inode_dirty(struct inode *, int);
	extern void nilfs_dirty_inode(struct inode *, int flags);
	int nilfs_fiemap(struct inode inode, struct fiemap_extent_info fieinfo,
	__u64 start, __u64 len);
	static inline int nilfs_mark_inode_dirty(struct inode *inode)
	{
	return __nilfs_mark_inode_dirty(inode, I_DIRTY);
	}
	static inline int nilfs_mark_inode_dirty_sync(struct inode *inode)
	{
	return __nilfs_mark_inode_dirty(inode, I_DIRTY_SYNC);
	}

	/* super.c */
	extern struct inode nilfs_alloc_inode(struct super_block );
	extern void nilfs_destroy_inode(struct inode *);

	extern __printf(3, 4)
	void __nilfs_msg(struct super_block sb, const char level,
	const char *fmt, ...);
	extern __printf(3, 4)
	void __nilfs_error(struct super_block sb, const char function,
	const char *fmt, ...);

	#ifdef CONFIG_PRINTK

	#define nilfs_msg(sb, level, fmt, ...) \
	__nilfs_msg(sb, level, fmt, ##__VA_ARGS__)
	#define nilfs_error(sb, fmt, ...) \
	__nilfs_error(sb, __func__, fmt, ##__VA_ARGS__)

	#else

	#define nilfs_msg(sb, level, fmt, ...) \
	do { \
	no_printk(fmt, ##__VA_ARGS__); \
	(void)(sb); \
	} while (0)
	#define nilfs_error(sb, fmt, ...) \
	do { \
	no_printk(fmt, ##__VA_ARGS__); \
	__nilfs_error(sb, "", " "); \
	} while (0)

	#endif /* CONFIG_PRINTK */

	extern struct nilfs_super_block *
	nilfs_read_super_block(struct super_block , u64, int, struct buffer_head *);
	extern int nilfs_store_magic_and_option(struct super_block *,
	struct nilfs_super_block , char );
	extern int nilfs_check_feature_compatibility(struct super_block *,
	struct nilfs_super_block *);
	extern void nilfs_set_log_cursor(struct nilfs_super_block *,
	struct the_nilfs *);
	struct nilfs_super_block *nilfs_prepare_super(struct super_block sb,
	int flip);
	int nilfs_commit_super(struct super_block *sb, int flag);
	int nilfs_cleanup_super(struct super_block *sb);
	int nilfs_resize_fs(struct super_block *sb, __u64 newsize);
	int nilfs_attach_checkpoint(struct super_block *sb, __u64 cno, int curr_mnt,
	struct nilfs_root **root);
	int nilfs_checkpoint_is_mounted(struct super_block *sb, __u64 cno);

	/* gcinode.c */
	int nilfs_gccache_submit_read_data(struct inode *, sector_t, sector_t, __u64,
	struct buffer_head **);
	int nilfs_gccache_submit_read_node(struct inode *, sector_t, __u64,
	struct buffer_head **);
	int nilfs_gccache_wait_and_mark_dirty(struct buffer_head *);
	int nilfs_init_gcinode(struct inode *inode);
	void nilfs_remove_all_gcinodes(struct the_nilfs *nilfs);

	/* sysfs.c */
	int __init nilfs_sysfs_init(void);
	void nilfs_sysfs_exit(void);
	int nilfs_sysfs_create_device_group(struct super_block *);
	void nilfs_sysfs_delete_device_group(struct the_nilfs *);
	int nilfs_sysfs_create_snapshot_group(struct nilfs_root *);
	void nilfs_sysfs_delete_snapshot_group(struct nilfs_root *);

	/*
	* Inodes and files operations
	*/
	extern const struct file_operations nilfs_dir_operations;
	extern const struct inode_operations nilfs_file_inode_operations;
	extern const struct file_operations nilfs_file_operations;
	extern const struct address_space_operations nilfs_aops;
	extern const struct inode_operations nilfs_dir_inode_operations;
	extern const struct inode_operations nilfs_special_inode_operations;
	extern const struct inode_operations nilfs_symlink_inode_operations;

	/*
	* filesystem type
	*/
	extern struct file_system_type nilfs_fs_type;


	#endif /* _NILFS_H */