fs/jfs/jfs_incore.h - linux - Git at Google

 /*
  *   Copyright (C) International Business Machines Corp., 2000-2004
  *   Portions Copyright (C) Christoph Hellwig, 2001-2002
  *
  *   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.
  *
  *   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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  */
 #ifndef _H_JFS_INCORE
 #define _H_JFS_INCORE

 #include <linux/rwsem.h>
 #include <linux/slab.h>
 #include <linux/bitops.h>
 #include "jfs_types.h"
 #include "jfs_xtree.h"
 #include "jfs_dtree.h"

 /*
  * JFS magic number
  */
 #define JFS_SUPER_MAGIC 0x3153464a /* "JFS1" */

 /*
  * JFS-private inode information
  */
 struct jfs_inode_info {
 	int	fileset;	/* fileset number (always 16)*/
 	uint	mode2;		/* jfs-specific mode		*/
 	pxd_t   ixpxd;		/* inode extent descriptor	*/
 	dxd_t	acl;		/* dxd describing acl	*/
 	dxd_t	ea;		/* dxd describing ea	*/
 	time_t	otime;		/* time created	*/
 	uint	next_index;	/* next available directory entry index */
 	int	acltype;	/* Type of ACL	*/
 	short	btorder;	/* access order	*/
 	short	btindex;	/* btpage entry index*/
 	struct inode *ipimap;	/* inode map			*/
 	long	cflag;		/* commit flags		*/
 	u16	bxflag;		/* xflag of pseudo buffer?	*/
 	unchar	agno;		/* ag number			*/
 	signed char active_ag;	/* ag currently allocating from	*/
 	lid_t	blid;		/* lid of pseudo buffer?	*/
 	lid_t	atlhead;	/* anonymous tlock list head	*/
 	lid_t	atltail;	/* anonymous tlock list tail	*/
 	spinlock_t ag_lock;	/* protects active_ag		*/
 	struct list_head anon_inode_list; /* inodes having anonymous txns */
 	/*
 	 * rdwrlock serializes xtree between reads & writes and synchronizes
 	 * changes to special inodes.  It's use would be redundant on
 	 * directories since the i_sem taken in the VFS is sufficient.
 	 */
 	struct rw_semaphore rdwrlock;
 	/*
 	 * commit_sem serializes transaction processing on an inode.
 	 * It must be taken after beginning a transaction (txBegin), since
 	 * dirty inodes may be committed while a new transaction on the
 	 * inode is blocked in txBegin or TxBeginAnon
 	 */
 	struct semaphore commit_sem;
 	/* xattr_sem allows us to access the xattrs without taking i_sem */
 	struct rw_semaphore xattr_sem;
 	lid_t	xtlid;		/* lid of xtree lock on directory */
 #ifdef CONFIG_JFS_POSIX_ACL
 	struct posix_acl *i_acl;
 	struct posix_acl *i_default_acl;
 #endif
 	union {
 		struct {
 			xtpage_t _xtroot;	/* 288: xtree root */
 			struct inomap *_imap;	/* 4: inode map header	*/
 		} file;
 		struct {
 			struct dir_table_slot _table[12]; /* 96: dir index */
 			dtroot_t _dtroot;	/* 288: dtree root */
 		} dir;
 		struct {
 			unchar _unused[16];	/* 16: */
 			dxd_t _dxd;		/* 16: */
 			unchar _inline[128];	/* 128: inline symlink */
 			/* _inline_ea may overlay the last part of
 			 * file._xtroot if maxentry = XTROOTINITSLOT
 			 */
 			unchar _inline_ea[128];	/* 128: inline extended attr */
 		} link;
 	} u;
 	u32 dev;	/* will die when we get wide dev_t */
 	struct inode	vfs_inode;
 };
 #define i_xtroot u.file._xtroot
 #define i_imap u.file._imap
 #define i_dirtable u.dir._table
 #define i_dtroot u.dir._dtroot
 #define i_inline u.link._inline
 #define i_inline_ea u.link._inline_ea

 #define JFS_ACL_NOT_CACHED ((void *)-1)

 #define IREAD_LOCK(ip)		down_read(&JFS_IP(ip)->rdwrlock)
 #define IREAD_UNLOCK(ip)	up_read(&JFS_IP(ip)->rdwrlock)
 #define IWRITE_LOCK(ip)		down_write(&JFS_IP(ip)->rdwrlock)
 #define IWRITE_UNLOCK(ip)	up_write(&JFS_IP(ip)->rdwrlock)

 /*
  * cflag
  */
 enum cflags {
 	COMMIT_Nolink,		/* inode committed with zero link count */
 	COMMIT_Inlineea,	/* commit inode inline EA */
 	COMMIT_Freewmap,	/* free WMAP at iClose() */
 	COMMIT_Dirty,		/* Inode is really dirty */
 	COMMIT_Dirtable,	/* commit changes to di_dirtable */
 	COMMIT_Stale,		/* data extent is no longer valid */
 	COMMIT_Synclist,	/* metadata pages on group commit synclist */
 };

 #define set_cflag(flag, ip)	set_bit(flag, &(JFS_IP(ip)->cflag))
 #define clear_cflag(flag, ip)	clear_bit(flag, &(JFS_IP(ip)->cflag))
 #define test_cflag(flag, ip)	test_bit(flag, &(JFS_IP(ip)->cflag))
 #define test_and_clear_cflag(flag, ip) \
 	test_and_clear_bit(flag, &(JFS_IP(ip)->cflag))
 /*
  * JFS-private superblock information.
  */
 struct jfs_sb_info {
 	struct super_block *sb;		/* Point back to vfs super block */
 	unsigned long	mntflag;	/* aggregate attributes	*/
 	struct inode	*ipbmap;	/* block map inode		*/
 	struct inode	*ipaimap;	/* aggregate inode map inode	*/
 	struct inode	*ipaimap2;	/* secondary aimap inode	*/
 	struct inode	*ipimap;	/* aggregate inode map inode	*/
 	struct jfs_log	*log;		/* log			*/
 	struct list_head log_list;	/* volumes associated with a journal */
 	short		bsize;		/* logical block size	*/
 	short		l2bsize;	/* log2 logical block size	*/
 	short		nbperpage;	/* blocks per page		*/
 	short		l2nbperpage;	/* log2 blocks per page	*/
 	short		l2niperblk;	/* log2 inodes per page	*/
 	dev_t		logdev;		/* external log device	*/
 	uint		aggregate;	/* volume identifier in log record */
 	pxd_t		logpxd;		/* pxd describing log	*/
 	pxd_t		fsckpxd;	/* pxd describing fsck wkspc */
 	pxd_t		ait2;		/* pxd describing AIT copy	*/
 	char		uuid[16];	/* 128-bit uuid for volume	*/
 	char		loguuid[16];	/* 128-bit uuid for log	*/
 	/*
 	 * commit_state is used for synchronization of the jfs_commit
 	 * threads.  It is protected by LAZY_LOCK().
 	 */
 	int		commit_state;	/* commit state */
 	/* Formerly in ipimap */
 	uint		gengen;		/* inode generation generator*/
 	uint		inostamp;	/* shows inode belongs to fileset*/

         /* Formerly in ipbmap */
 	struct bmap	*bmap;		/* incore bmap descriptor	*/
 	struct nls_table *nls_tab;	/* current codepage		*/
 	uint		state;		/* mount/recovery state	*/
 	unsigned long	flag;		/* mount time flags */
 	uint		p_state;	/* state prior to going no integrity */
 };

 /* jfs_sb_info commit_state */
 #define IN_LAZYCOMMIT 1

 static inline struct jfs_inode_info *JFS_IP(struct inode *inode)
 {
 	return list_entry(inode, struct jfs_inode_info, vfs_inode);
 }

 static inline int jfs_dirtable_inline(struct inode *inode)
 {
 	return (JFS_IP(inode)->next_index <= (MAX_INLINE_DIRTABLE_ENTRY + 1));
 }

 static inline struct jfs_sb_info *JFS_SBI(struct super_block *sb)
 {
 	return sb->s_fs_info;
 }

 static inline int isReadOnly(struct inode *inode)
 {
 	if (JFS_SBI(inode->i_sb)->log)
 		return 0;
 	return 1;
 }
 #endif /* _H_JFS_INCORE */
	/*
	* Copyright (C) International Business Machines Corp., 2000-2004
	* Portions Copyright (C) Christoph Hellwig, 2001-2002
	*
	* 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.
	*
	* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	*/
	#ifndef _H_JFS_INCORE
	#define _H_JFS_INCORE

	#include <linux/rwsem.h>
	#include <linux/slab.h>
	#include <linux/bitops.h>
	#include "jfs_types.h"
	#include "jfs_xtree.h"
	#include "jfs_dtree.h"

	/*
	* JFS magic number
	*/
	#define JFS_SUPER_MAGIC 0x3153464a /* "JFS1" */

	/*
	* JFS-private inode information
	*/
	struct jfs_inode_info {
	int fileset; /* fileset number (always 16)*/
	uint mode2; /* jfs-specific mode */
	pxd_t ixpxd; /* inode extent descriptor */
	dxd_t acl; /* dxd describing acl */
	dxd_t ea; /* dxd describing ea */
	time_t otime; /* time created */
	uint next_index; /* next available directory entry index */
	int acltype; /* Type of ACL */
	short btorder; /* access order */
	short btindex; /* btpage entry index*/
	struct inode ipimap; / inode map */
	long cflag; /* commit flags */
	u16 bxflag; /* xflag of pseudo buffer? */
	unchar agno; /* ag number */
	signed char active_ag; /* ag currently allocating from */
	lid_t blid; /* lid of pseudo buffer? */
	lid_t atlhead; /* anonymous tlock list head */
	lid_t atltail; /* anonymous tlock list tail */
	spinlock_t ag_lock; /* protects active_ag */
	struct list_head anon_inode_list; /* inodes having anonymous txns */
	/*
	* rdwrlock serializes xtree between reads & writes and synchronizes
	* changes to special inodes. It's use would be redundant on
	* directories since the i_sem taken in the VFS is sufficient.
	*/
	struct rw_semaphore rdwrlock;
	/*
	* commit_sem serializes transaction processing on an inode.
	* It must be taken after beginning a transaction (txBegin), since
	* dirty inodes may be committed while a new transaction on the
	* inode is blocked in txBegin or TxBeginAnon
	*/
	struct semaphore commit_sem;
	/* xattr_sem allows us to access the xattrs without taking i_sem */
	struct rw_semaphore xattr_sem;
	lid_t xtlid; /* lid of xtree lock on directory */
	#ifdef CONFIG_JFS_POSIX_ACL
	struct posix_acl *i_acl;
	struct posix_acl *i_default_acl;
	#endif
	union {
	struct {
	xtpage_t _xtroot; /* 288: xtree root */
	struct inomap _imap; / 4: inode map header */
	} file;
	struct {
	struct dir_table_slot _table[12]; /* 96: dir index */
	dtroot_t _dtroot; /* 288: dtree root */
	} dir;
	struct {
	unchar _unused[16]; /* 16: */
	dxd_t _dxd; /* 16: */
	unchar _inline[128]; /* 128: inline symlink */
	/* _inline_ea may overlay the last part of
	* file._xtroot if maxentry = XTROOTINITSLOT
	*/
	unchar _inline_ea[128]; /* 128: inline extended attr */
	} link;
	} u;
	u32 dev; /* will die when we get wide dev_t */
	struct inode vfs_inode;
	};
	#define i_xtroot u.file._xtroot
	#define i_imap u.file._imap
	#define i_dirtable u.dir._table
	#define i_dtroot u.dir._dtroot
	#define i_inline u.link._inline
	#define i_inline_ea u.link._inline_ea

	#define JFS_ACL_NOT_CACHED ((void *)-1)

	#define IREAD_LOCK(ip) down_read(&JFS_IP(ip)->rdwrlock)
	#define IREAD_UNLOCK(ip) up_read(&JFS_IP(ip)->rdwrlock)
	#define IWRITE_LOCK(ip) down_write(&JFS_IP(ip)->rdwrlock)
	#define IWRITE_UNLOCK(ip) up_write(&JFS_IP(ip)->rdwrlock)

	/*
	* cflag
	*/
	enum cflags {
	COMMIT_Nolink, /* inode committed with zero link count */
	COMMIT_Inlineea, /* commit inode inline EA */
	COMMIT_Freewmap, /* free WMAP at iClose() */
	COMMIT_Dirty, /* Inode is really dirty */
	COMMIT_Dirtable, /* commit changes to di_dirtable */
	COMMIT_Stale, /* data extent is no longer valid */
	COMMIT_Synclist, /* metadata pages on group commit synclist */
	};

	#define set_cflag(flag, ip) set_bit(flag, &(JFS_IP(ip)->cflag))
	#define clear_cflag(flag, ip) clear_bit(flag, &(JFS_IP(ip)->cflag))
	#define test_cflag(flag, ip) test_bit(flag, &(JFS_IP(ip)->cflag))
	#define test_and_clear_cflag(flag, ip) \
	test_and_clear_bit(flag, &(JFS_IP(ip)->cflag))
	/*
	* JFS-private superblock information.
	*/
	struct jfs_sb_info {
	struct super_block sb; / Point back to vfs super block */
	unsigned long mntflag; /* aggregate attributes */
	struct inode ipbmap; / block map inode */
	struct inode ipaimap; / aggregate inode map inode */
	struct inode ipaimap2; / secondary aimap inode */
	struct inode ipimap; / aggregate inode map inode */
	struct jfs_log log; / log */
	struct list_head log_list; /* volumes associated with a journal */
	short bsize; /* logical block size */
	short l2bsize; /* log2 logical block size */
	short nbperpage; /* blocks per page */
	short l2nbperpage; /* log2 blocks per page */
	short l2niperblk; /* log2 inodes per page */
	dev_t logdev; /* external log device */
	uint aggregate; /* volume identifier in log record */
	pxd_t logpxd; /* pxd describing log */
	pxd_t fsckpxd; /* pxd describing fsck wkspc */
	pxd_t ait2; /* pxd describing AIT copy */
	char uuid[16]; /* 128-bit uuid for volume */
	char loguuid[16]; /* 128-bit uuid for log */
	/*
	* commit_state is used for synchronization of the jfs_commit
	* threads. It is protected by LAZY_LOCK().
	*/
	int commit_state; /* commit state */
	/* Formerly in ipimap */
	uint gengen; /* inode generation generator*/
	uint inostamp; /* shows inode belongs to fileset*/

	/* Formerly in ipbmap */
	struct bmap bmap; / incore bmap descriptor */
	struct nls_table nls_tab; / current codepage */
	uint state; /* mount/recovery state */
	unsigned long flag; /* mount time flags */
	uint p_state; /* state prior to going no integrity */
	};

	/* jfs_sb_info commit_state */
	#define IN_LAZYCOMMIT 1

	static inline struct jfs_inode_info JFS_IP(struct inode inode)
	{
	return list_entry(inode, struct jfs_inode_info, vfs_inode);
	}

	static inline int jfs_dirtable_inline(struct inode *inode)
	{
	return (JFS_IP(inode)->next_index <= (MAX_INLINE_DIRTABLE_ENTRY + 1));
	}

	static inline struct jfs_sb_info JFS_SBI(struct super_block sb)
	{
	return sb->s_fs_info;
	}

	static inline int isReadOnly(struct inode *inode)
	{
	if (JFS_SBI(inode->i_sb)->log)
	return 0;
	return 1;
	}
	#endif /* _H_JFS_INCORE */