patch-2.4.20 linux-2.4.20/fs/jfs/jfs_incore.h

• Lines: 185
• Date: Thu Nov 28 15:53:15 2002
• Orig file: linux-2.4.19/fs/jfs/jfs_incore.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -urN linux-2.4.19/fs/jfs/jfs_incore.h linux-2.4.20/fs/jfs/jfs_incore.h
@@ -0,0 +1,184 @@
+/*
+ *   Copyright (c) International Business Machines Corp., 2000-2002
+ *   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 <asm/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 {
+	struct inode *inode;	/* pointer back to fs-independent inode */
+	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	*/
+	struct list_head anon_inode_list; /* inodes having anonymous txns */
+	struct list_head mp_list; /* metapages in inode's address space */
+	/*
+	 * 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;
+	lid_t	xtlid;		/* lid of xtree lock on directory */
+	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;
+};
+#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 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_New,		/* never committed inode   */
+	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_Holdlock,	/* Hold the IWRITE_LOCK until commit is done */
+	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 {
+	unsigned long	mntflag;	/* 4: aggregate attributes	*/
+	struct inode	*ipbmap;	/* 4: block map inode		*/
+	struct inode	*ipaimap;	/* 4: aggregate inode map inode	*/
+	struct inode	*ipaimap2;	/* 4: secondary aimap inode	*/
+	struct inode	*ipimap;	/* 4: aggregate inode map inode	*/
+	struct jfs_log	*log;		/* 4: log			*/
+	short		bsize;		/* 2: logical block size	*/
+	short		l2bsize;	/* 2: log2 logical block size	*/
+	short		nbperpage;	/* 2: blocks per page		*/
+	short		l2nbperpage;	/* 2: log2 blocks per page	*/
+	short		l2niperblk;	/* 2: log2 inodes per page	*/
+	kdev_t		logdev;		/* 2: external log device	*/
+	uint		aggregate;	/* volume identifier in log record */
+	pxd_t		logpxd;		/* 8: pxd describing log	*/
+	pxd_t		fsckpxd;	/* 8: pxd describing fsck wkspc */
+	pxd_t		ait2;		/* 8: pxd describing AIT copy	*/
+	char		uuid[16];	/* 16: 128-bit uuid for volume	*/
+	char		loguuid[16];	/* 16: 128-bit uuid for log	*/
+	/* Formerly in ipimap */
+	uint		gengen;		/* 4: inode generation generator*/
+	uint		inostamp;	/* 4: shows inode belongs to fileset*/
+
+        /* Formerly in ipbmap */
+	struct bmap	*bmap;		/* 4: incore bmap descriptor	*/
+	struct nls_table *nls_tab;	/* 4: current codepage		*/
+	uint		state;		/* 4: mount/recovery state	*/
+};
+
+static inline struct jfs_inode_info *JFS_IP(struct inode *inode)
+{
+	return inode->u.generic_ip;
+}
+
+static inline struct jfs_sb_info *JFS_SBI(struct super_block *sb)
+{
+	return sb->u.generic_sbp;
+}
+
+static inline int isReadOnly(struct inode *inode)
+{
+	if (JFS_SBI(inode->i_sb)->log)
+		return 0;
+	return 1;
+}
+
+/*
+ * Allocating and freeing the structure
+ */
+extern kmem_cache_t *jfs_inode_cachep;
+extern int alloc_jfs_inode(struct inode *);
+
+#define free_jfs_inode(inode) \
+	kmem_cache_free(jfs_inode_cachep, (inode)->u.generic_ip)
+
+#endif /* _H_JFS_INCORE */