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

• Lines: 152
• Date: Thu Nov 28 15:53:15 2002
• Orig file: linux-2.4.19/fs/jfs/jfs_dinode.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -urN linux-2.4.19/fs/jfs/jfs_dinode.h linux-2.4.20/fs/jfs/jfs_dinode.h
@@ -0,0 +1,151 @@
+/*
+ *   Copyright (c) International Business Machines Corp., 2000-2001
+ *
+ *   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_DINODE
+#define _H_JFS_DINODE
+
+/*
+ *      jfs_dinode.h: on-disk inode manager
+ */
+
+#define INODESLOTSIZE           128
+#define L2INODESLOTSIZE         7
+#define log2INODESIZE           9	/* log2(bytes per dinode) */
+
+
+/*
+ *      on-disk inode : 512 bytes
+ *
+ * note: align 64-bit fields on 8-byte boundary.
+ */
+struct dinode {
+	/*
+	 *      I. base area (128 bytes)
+	 *      ------------------------
+	 *
+	 * define generic/POSIX attributes
+	 */
+	u32 di_inostamp;	/* 4: stamp to show inode belongs to fileset */
+	s32 di_fileset;		/* 4: fileset number */
+	u32 di_number;		/* 4: inode number, aka file serial number */
+	u32 di_gen;		/* 4: inode generation number */
+
+	pxd_t di_ixpxd;		/* 8: inode extent descriptor */
+
+	s64 di_size;		/* 8: size */
+	s64 di_nblocks;		/* 8: number of blocks allocated */
+
+	u32 di_nlink;		/* 4: number of links to the object */
+
+	u32 di_uid;		/* 4: user id of owner */
+	u32 di_gid;		/* 4: group id of owner */
+
+	u32 di_mode;		/* 4: attribute, format and permission */
+
+	struct timestruc_t di_atime;	/* 8: time last data accessed */
+	struct timestruc_t di_ctime;	/* 8: time last status changed */
+	struct timestruc_t di_mtime;	/* 8: time last data modified */
+	struct timestruc_t di_otime;	/* 8: time created */
+
+	dxd_t di_acl;		/* 16: acl descriptor */
+
+	dxd_t di_ea;		/* 16: ea descriptor */
+
+	u32 di_next_index;	/* 4: Next available dir_table index */
+
+	s32 di_acltype;		/* 4: Type of ACL */
+
+	/*
+	 *      Extension Areas.
+	 *
+	 *      Historically, the inode was partitioned into 4 128-byte areas,
+	 *      the last 3 being defined as unions which could have multiple
+	 *      uses.  The first 96 bytes had been completely unused until
+	 *      an index table was added to the directory.  It is now more
+	 *      useful to describe the last 3/4 of the inode as a single
+	 *      union.  We would probably be better off redesigning the
+	 *      entire structure from scratch, but we don't want to break
+	 *      commonality with OS/2's JFS at this time.
+	 */
+	union {
+		struct {
+			/*
+			 * This table contains the information needed to
+			 * find a directory entry from a 32-bit index.
+			 * If the index is small enough, the table is inline,
+			 * otherwise, an x-tree root overlays this table
+			 */
+			struct dir_table_slot _table[12]; /* 96: inline */
+
+			dtroot_t _dtroot;		/* 288: dtree root */
+		} _dir;					/* (384) */
+#define di_dirtable	u._dir._table
+#define di_dtroot	u._dir._dtroot
+#define di_parent       di_dtroot.header.idotdot
+#define di_DASD		di_dtroot.header.DASD
+
+		struct {
+			union {
+				u8 _data[96];		/* 96: unused */
+				struct {
+					void *_imap;	/* 4: unused */
+					u32 _gengen;	/* 4: generator */
+				} _imap;
+			} _u1;				/* 96: */
+#define di_gengen	u._file._u1._imap._gengen
+
+			union {
+				xtpage_t _xtroot;
+				struct {
+					u8 unused[16];	/* 16: */
+					dxd_t _dxd;	/* 16: */
+					union {
+						u32 _rdev;	/* 4: */
+						u8 _fastsymlink[128];
+					} _u;
+					u8 _inlineea[128];
+				} _special;
+			} _u2;
+		} _file;
+#define di_xtroot	u._file._u2._xtroot
+#define di_dxd		u._file._u2._special._dxd
+#define di_btroot	di_xtroot
+#define di_inlinedata	u._file._u2._special._u
+#define di_rdev		u._file._u2._special._u._rdev
+#define di_fastsymlink	u._file._u2._special._u._fastsymlink
+#define di_inlineea     u._file._u2._special._inlineea
+	} u;
+};
+
+/* extended mode bits (on-disk inode di_mode) */
+#define IFJOURNAL       0x00010000	/* journalled file */
+#define ISPARSE         0x00020000	/* sparse file enabled */
+#define INLINEEA        0x00040000	/* inline EA area free */
+#define ISWAPFILE	0x00800000	/* file open for pager swap space */
+
+/* more extended mode bits: attributes for OS/2 */
+#define IREADONLY	0x02000000	/* no write access to file */
+#define IARCHIVE	0x40000000	/* file archive bit */
+#define ISYSTEM		0x08000000	/* system file */
+#define IHIDDEN		0x04000000	/* hidden file */
+#define IRASH		0x4E000000	/* mask for changeable attributes */
+#define INEWNAME	0x80000000	/* non-8.3 filename format */
+#define IDIRECTORY	0x20000000	/* directory (shadow of real bit) */
+#define ATTRSHIFT	25	/* bits to shift to move attribute
+				   specification to mode position */
+
+#endif /*_H_JFS_DINODE */