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

 /* SPDX-License-Identifier: GPL-2.0-or-later */
 /*
  *   Copyright (C) International Business Machines Corp., 2000-2004
  *   Portions Copyright (C) Christoph Hellwig, 2001-2002
  */
 #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 <linux/uuid.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		*/
 	kuid_t	saved_uid;	/* saved for uid mount option */
 	kgid_t	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	*/
 	time64_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			*/
 	unsigned long cflag;	/* commit flags		*/
 	u64	agstart;	/* agstart of the containing IAG */
 	u16	bxflag;		/* xflag of pseudo buffer?	*/
 	unchar	pad;
 	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 */
 	union {
 		struct {
 			xtroot_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: */
 			/* _inline may overflow into _inline_ea when needed */
 			/* _inline_ea may overlay the last part of
 			 * file._xtroot if maxentry = XTROOTINITSLOT
 			 */
 			union {
 				struct {
 					/* 128: inline symlink */
 					unchar _inline[128];
 					/* 128: inline extended attr */
 					unchar _inline_ea[128];
 				};
 				unchar _inline_all[256];
 			};
 		} link;
 	} u;
 #ifdef CONFIG_QUOTA
 	struct dquot __rcu *i_dquot[MAXQUOTAS];
 #endif
 	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 i_inline_all u.link._inline_all

 #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	*/
 	uuid_t		uuid;		/* 128-bit uuid for volume	*/
 	uuid_t		loguuid;	/* 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 */
 	kuid_t		uid;		/* uid to override on-disk uid */
 	kgid_t		gid;		/* gid to override on-disk gid */
 	uint		umask;		/* umask to override on-disk umask */
 	uint		minblks_trim;	/* minimum blocks, for online trim */
 };

 /* jfs_sb_info commit_state */
 #define IN_LAZYCOMMIT 1

 static inline struct jfs_inode_info *JFS_IP(struct inode *inode)
 {
 	return container_of(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 */
	/* SPDX-License-Identifier: GPL-2.0-or-later */
	/*
	* Copyright (C) International Business Machines Corp., 2000-2004
	* Portions Copyright (C) Christoph Hellwig, 2001-2002
	*/
	#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 <linux/uuid.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 */
	kuid_t saved_uid; /* saved for uid mount option */
	kgid_t 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 */
	time64_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 */
	unsigned long cflag; /* commit flags */
	u64 agstart; /* agstart of the containing IAG */
	u16 bxflag; /* xflag of pseudo buffer? */
	unchar pad;
	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 */
	union {
	struct {
	xtroot_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: */
	/* _inline may overflow into _inline_ea when needed */
	/* _inline_ea may overlay the last part of
	* file._xtroot if maxentry = XTROOTINITSLOT
	*/
	union {
	struct {
	/* 128: inline symlink */
	unchar _inline[128];
	/* 128: inline extended attr */
	unchar _inline_ea[128];
	};
	unchar _inline_all[256];
	};
	} link;
	} u;
	#ifdef CONFIG_QUOTA
	struct dquot __rcu *i_dquot[MAXQUOTAS];
	#endif
	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 i_inline_all u.link._inline_all

	#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 */
	uuid_t uuid; /* 128-bit uuid for volume */
	uuid_t loguuid; /* 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 */
	kuid_t uid; /* uid to override on-disk uid */
	kgid_t gid; /* gid to override on-disk gid */
	uint umask; /* umask to override on-disk umask */
	uint minblks_trim; /* minimum blocks, for online trim */
	};

	/* jfs_sb_info commit_state */
	#define IN_LAZYCOMMIT 1

	static inline struct jfs_inode_info JFS_IP(struct inode inode)
	{
	return container_of(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 */