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DEFINITIONS
This source file includes following definitions.
- JFS_IP
- jfs_dirtable_inline
- JFS_SBI
- isReadOnly
/*
* 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 */
unsigned 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 */