[mirror_ubuntu-zesty-kernel.git] / fs / jfs / jfs_incore.h

/*
 *   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/mutex.h>
#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		*/
	uint	saved_uid;	/* saved for uid mount option */
	uint	saved_gid;	/* saved for gid mount option */
	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_mutex taken in the VFS is sufficient.
	 */
	struct rw_semaphore rdwrlock;
	/*
	 * commit_mutex 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 mutex commit_mutex;
	/* xattr_sem allows us to access the xattrs without taking i_mutex */
	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, subclass) \
	down_read_nested(&JFS_IP(ip)->rdwrlock, subclass)
#define IREAD_UNLOCK(ip)	up_read(&JFS_IP(ip)->rdwrlock)
#define IWRITE_LOCK(ip, subclass) \
	down_write_nested(&JFS_IP(ip)->rdwrlock, subclass)
#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 */
};

/*
 * commit_mutex nesting subclasses:
 */
enum commit_mutex_class
{
	COMMIT_MUTEX_PARENT,
	COMMIT_MUTEX_CHILD,
	COMMIT_MUTEX_SECOND_PARENT,	/* Renaming */
	COMMIT_MUTEX_VICTIM		/* Inode being unlinked due to rename */
};

/*
 * rdwrlock subclasses:
 * The dmap inode may be locked while a normal inode or the imap inode are
 * locked.
 */
enum rdwrlock_class
{
	RDWRLOCK_NORMAL,
	RDWRLOCK_IMAP,
	RDWRLOCK_DMAP
};

#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		*/
	struct inode *direct_inode;	/* metadata inode */
	uint		state;		/* mount/recovery state	*/
	unsigned long	flag;		/* mount time flags */
	uint		p_state;	/* state prior to going no integrity */
	uint		uid;		/* uid to override on-disk uid */
	uint		gid;		/* gid to override on-disk gid */
	uint		umask;		/* umask to override on-disk umask */
};

/* 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 */
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Copyright (C) International Business Machines Corp., 2000-2004
	3	* Portions Copyright (C) Christoph Hellwig, 2001-2002
	4	*
	5	* This program is free software; you can redistribute it and/or modify
	6	* it under the terms of the GNU General Public License as published by
63f83c9f	7	* the Free Software Foundation; either version 2 of the License, or
1da177e4	8	* (at your option) any later version.
63f83c9f	9	*
1da177e4 LT	10	* This program is distributed in the hope that it will be useful,
	11	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
	13	* the GNU General Public License for more details.
	14	*
	15	* You should have received a copy of the GNU General Public License
63f83c9f	16	* along with this program; if not, write to the Free Software
1da177e4	17	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
63f83c9f	18	*/
1da177e4 LT	19	#ifndef _H_JFS_INCORE
	20	#define _H_JFS_INCORE
	21
1de87444	22	#include <linux/mutex.h>
1da177e4 LT	23	#include <linux/rwsem.h>
	24	#include <linux/slab.h>
	25	#include <linux/bitops.h>
	26	#include "jfs_types.h"
	27	#include "jfs_xtree.h"
	28	#include "jfs_dtree.h"
	29
	30	/*
	31	* JFS magic number
	32	*/
	33	#define JFS_SUPER_MAGIC 0x3153464a /* "JFS1" */
	34
	35	/*
	36	* JFS-private inode information
	37	*/
	38	struct jfs_inode_info {
	39	int fileset; /* fileset number (always 16)*/
	40	uint mode2; /* jfs-specific mode */
69eb66d7 DK	41	uint saved_uid; /* saved for uid mount option */
69eb66d7 DK	42	uint saved_gid; /* saved for gid mount option */
f720e3ba	43	pxd_t ixpxd; /* inode extent descriptor */
1da177e4 LT	44	dxd_t acl; /* dxd describing acl */
	45	dxd_t ea; /* dxd describing ea */
	46	time_t otime; /* time created */
	47	uint next_index; /* next available directory entry index */
	48	int acltype; /* Type of ACL */
	49	short btorder; /* access order */
	50	short btindex; /* btpage entry index*/
	51	struct inode ipimap; / inode map */
	52	long cflag; /* commit flags */
	53	u16 bxflag; /* xflag of pseudo buffer? */
	54	unchar agno; /* ag number */
	55	signed char active_ag; /* ag currently allocating from */
	56	lid_t blid; /* lid of pseudo buffer? */
	57	lid_t atlhead; /* anonymous tlock list head */
	58	lid_t atltail; /* anonymous tlock list tail */
	59	spinlock_t ag_lock; /* protects active_ag */
	60	struct list_head anon_inode_list; /* inodes having anonymous txns */
	61	/*
	62	* rdwrlock serializes xtree between reads & writes and synchronizes
	63	* changes to special inodes. It's use would be redundant on
1b1dcc1b	64	* directories since the i_mutex taken in the VFS is sufficient.
1da177e4 LT	65	*/
	66	struct rw_semaphore rdwrlock;
	67	/*
1de87444	68	* commit_mutex serializes transaction processing on an inode.
1da177e4 LT	69	* It must be taken after beginning a transaction (txBegin), since
	70	* dirty inodes may be committed while a new transaction on the
	71	* inode is blocked in txBegin or TxBeginAnon
	72	*/
1de87444	73	struct mutex commit_mutex;
1b1dcc1b	74	/* xattr_sem allows us to access the xattrs without taking i_mutex */
1da177e4 LT	75	struct rw_semaphore xattr_sem;
	76	lid_t xtlid; /* lid of xtree lock on directory */
	77	#ifdef CONFIG_JFS_POSIX_ACL
	78	struct posix_acl *i_acl;
	79	struct posix_acl *i_default_acl;
	80	#endif
	81	union {
	82	struct {
	83	xtpage_t _xtroot; /* 288: xtree root */
	84	struct inomap _imap; / 4: inode map header */
	85	} file;
	86	struct {
	87	struct dir_table_slot _table[12]; /* 96: dir index */
	88	dtroot_t _dtroot; /* 288: dtree root */
	89	} dir;
	90	struct {
	91	unchar _unused[16]; /* 16: */
	92	dxd_t _dxd; /* 16: */
	93	unchar _inline[128]; /* 128: inline symlink */
	94	/* _inline_ea may overlay the last part of
	95	* file._xtroot if maxentry = XTROOTINITSLOT
	96	*/
	97	unchar _inline_ea[128]; /* 128: inline extended attr */
	98	} link;
	99	} u;
	100	u32 dev; /* will die when we get wide dev_t */
	101	struct inode vfs_inode;
	102	};
	103	#define i_xtroot u.file._xtroot
	104	#define i_imap u.file._imap
	105	#define i_dirtable u.dir._table
	106	#define i_dtroot u.dir._dtroot
	107	#define i_inline u.link._inline
	108	#define i_inline_ea u.link._inline_ea
	109
	110	#define JFS_ACL_NOT_CACHED ((void *)-1)
	111
82d5b9a7 DK	112	#define IREAD_LOCK(ip, subclass) \
82d5b9a7 DK	113	down_read_nested(&JFS_IP(ip)->rdwrlock, subclass)
1da177e4	114	#define IREAD_UNLOCK(ip) up_read(&JFS_IP(ip)->rdwrlock)
82d5b9a7 DK	115	#define IWRITE_LOCK(ip, subclass) \
82d5b9a7 DK	116	down_write_nested(&JFS_IP(ip)->rdwrlock, subclass)
1da177e4 LT	117	#define IWRITE_UNLOCK(ip) up_write(&JFS_IP(ip)->rdwrlock)
	118
	119	/*
	120	* cflag
	121	*/
	122	enum cflags {
	123	COMMIT_Nolink, /* inode committed with zero link count */
	124	COMMIT_Inlineea, /* commit inode inline EA */
	125	COMMIT_Freewmap, /* free WMAP at iClose() */
	126	COMMIT_Dirty, /* Inode is really dirty */
	127	COMMIT_Dirtable, /* commit changes to di_dirtable */
	128	COMMIT_Stale, /* data extent is no longer valid */
	129	COMMIT_Synclist, /* metadata pages on group commit synclist */
	130	};
	131
82d5b9a7 DK	132	/*
	133	* commit_mutex nesting subclasses:
	134	*/
	135	enum commit_mutex_class
	136	{
	137	COMMIT_MUTEX_PARENT,
	138	COMMIT_MUTEX_CHILD,
	139	COMMIT_MUTEX_SECOND_PARENT, /* Renaming */
	140	COMMIT_MUTEX_VICTIM /* Inode being unlinked due to rename */
	141	};
	142
	143	/*
	144	* rdwrlock subclasses:
	145	* The dmap inode may be locked while a normal inode or the imap inode are
	146	* locked.
	147	*/
	148	enum rdwrlock_class
	149	{
	150	RDWRLOCK_NORMAL,
	151	RDWRLOCK_IMAP,
	152	RDWRLOCK_DMAP
	153	};
	154
1da177e4 LT	155	#define set_cflag(flag, ip) set_bit(flag, &(JFS_IP(ip)->cflag))
	156	#define clear_cflag(flag, ip) clear_bit(flag, &(JFS_IP(ip)->cflag))
	157	#define test_cflag(flag, ip) test_bit(flag, &(JFS_IP(ip)->cflag))
	158	#define test_and_clear_cflag(flag, ip) \
	159	test_and_clear_bit(flag, &(JFS_IP(ip)->cflag))
	160	/*
	161	* JFS-private superblock information.
	162	*/
	163	struct jfs_sb_info {
	164	struct super_block sb; / Point back to vfs super block */
	165	unsigned long mntflag; /* aggregate attributes */
	166	struct inode ipbmap; / block map inode */
	167	struct inode ipaimap; / aggregate inode map inode */
	168	struct inode ipaimap2; / secondary aimap inode */
	169	struct inode ipimap; / aggregate inode map inode */
	170	struct jfs_log log; / log */
	171	struct list_head log_list; /* volumes associated with a journal */
	172	short bsize; /* logical block size */
	173	short l2bsize; /* log2 logical block size */
	174	short nbperpage; /* blocks per page */
	175	short l2nbperpage; /* log2 blocks per page */
	176	short l2niperblk; /* log2 inodes per page */
	177	dev_t logdev; /* external log device */
	178	uint aggregate; /* volume identifier in log record */
	179	pxd_t logpxd; /* pxd describing log */
	180	pxd_t fsckpxd; /* pxd describing fsck wkspc */
	181	pxd_t ait2; /* pxd describing AIT copy */
	182	char uuid[16]; /* 128-bit uuid for volume */
	183	char loguuid[16]; /* 128-bit uuid for log */
	184	/*
	185	* commit_state is used for synchronization of the jfs_commit
	186	* threads. It is protected by LAZY_LOCK().
	187	*/
	188	int commit_state; /* commit state */
	189	/* Formerly in ipimap */
	190	uint gengen; /* inode generation generator*/
	191	uint inostamp; /* shows inode belongs to fileset*/
	192
f720e3ba	193	/* Formerly in ipbmap */
1da177e4 LT	194	struct bmap bmap; / incore bmap descriptor */
1da177e4 LT	195	struct nls_table nls_tab; / current codepage */
7fab479b	196	struct inode direct_inode; / metadata inode */
1da177e4 LT	197	uint state; /* mount/recovery state */
	198	unsigned long flag; /* mount time flags */
	199	uint p_state; /* state prior to going no integrity */
69eb66d7 DK	200	uint uid; /* uid to override on-disk uid */
	201	uint gid; /* gid to override on-disk gid */
	202	uint umask; /* umask to override on-disk umask */
1da177e4 LT	203	};
	204
	205	/* jfs_sb_info commit_state */
	206	#define IN_LAZYCOMMIT 1
	207
	208	static inline struct jfs_inode_info JFS_IP(struct inode inode)
	209	{
	210	return list_entry(inode, struct jfs_inode_info, vfs_inode);
	211	}
	212
	213	static inline int jfs_dirtable_inline(struct inode *inode)
	214	{
	215	return (JFS_IP(inode)->next_index <= (MAX_INLINE_DIRTABLE_ENTRY + 1));
	216	}
	217
	218	static inline struct jfs_sb_info JFS_SBI(struct super_block sb)
	219	{
	220	return sb->s_fs_info;
	221	}
	222
	223	static inline int isReadOnly(struct inode *inode)
	224	{
	225	if (JFS_SBI(inode->i_sb)->log)
	226	return 0;
	227	return 1;
	228	}
	229	#endif /* _H_JFS_INCORE */