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linux-loongson/fs/freevxfs/vxfs.h
Theodore Ts'o 8e18e2941c [PATCH] inode_diet: Replace inode.u.generic_ip with inode.i_private 
The following patches reduce the size of the VFS inode structure by 28 bytes
on a UP x86.  (It would be more on an x86_64 system).  This is a 10% reduction
in the inode size on a UP kernel that is configured in a production mode
(i.e., with no spinlock or other debugging functions enabled; if you want to
save memory taken up by in-core inodes, the first thing you should do is
disable the debugging options; they are responsible for a huge amount of bloat
in the VFS inode structure).

This patch:

The filesystem or device-specific pointer in the inode is inside a union,
which is pretty pointless given that all 30+ users of this field have been
using the void pointer.  Get rid of the union and rename it to i_private, with
a comment to explain who is allowed to use the void pointer.  This is just a
cleanup, but it allows us to reuse the union 'u' for something something where
the union will actually be used.

[judith@osdl.org: powerpc build fix]
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: Judith Lebzelter <judith@osdl.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-09-27 08:26:17 -07:00

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/*
* Copyright (c) 2000-2001 Christoph Hellwig.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions, and the following disclaimer,
* without modification.
* 2. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* Alternatively, this software may be distributed under the terms of the
* GNU General Public License ("GPL").
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*/
#ifndef _VXFS_SUPER_H_
#define _VXFS_SUPER_H_
/*
* Veritas filesystem driver - superblock structure.
*
* This file contains the definition of the disk and core
* superblocks of the Veritas Filesystem.
*/
#include <linux/types.h>
/*
* Data types for use with the VxFS ondisk format.
*/
typedef int32_t vx_daddr_t;
typedef int32_t vx_ino_t;
/*
* Superblock magic number (vxfs_super->vs_magic).
*/
#define VXFS_SUPER_MAGIC 0xa501FCF5
/*
* The root inode.
*/
#define VXFS_ROOT_INO 2
/*
* Num of entries in free extent array
*/
#define VXFS_NEFREE 32
/*
* VxFS superblock (disk).
*/
struct vxfs_sb {
/*
* Readonly fields for the version 1 superblock.
*
* Lots of this fields are no more used by version 2
* and never filesystems.
*/
u_int32_t vs_magic; /* Magic number */
int32_t vs_version; /* VxFS version */
u_int32_t vs_ctime; /* create time - secs */
u_int32_t vs_cutime; /* create time - usecs */
int32_t __unused1; /* unused */
int32_t __unused2; /* unused */
vx_daddr_t vs_old_logstart; /* obsolete */
vx_daddr_t vs_old_logend; /* obsolete */
int32_t vs_bsize; /* block size */
int32_t vs_size; /* number of blocks */
int32_t vs_dsize; /* number of data blocks */
u_int32_t vs_old_ninode; /* obsolete */
int32_t vs_old_nau; /* obsolete */
int32_t __unused3; /* unused */
int32_t vs_old_defiextsize; /* obsolete */
int32_t vs_old_ilbsize; /* obsolete */
int32_t vs_immedlen; /* size of immediate data area */
int32_t vs_ndaddr; /* number of direct extentes */
vx_daddr_t vs_firstau; /* address of first AU */
vx_daddr_t vs_emap; /* offset of extent map in AU */
vx_daddr_t vs_imap; /* offset of inode map in AU */
vx_daddr_t vs_iextop; /* offset of ExtOp. map in AU */
vx_daddr_t vs_istart; /* offset of inode list in AU */
vx_daddr_t vs_bstart; /* offset of fdblock in AU */
vx_daddr_t vs_femap; /* aufirst + emap */
vx_daddr_t vs_fimap; /* aufirst + imap */
vx_daddr_t vs_fiextop; /* aufirst + iextop */
vx_daddr_t vs_fistart; /* aufirst + istart */
vx_daddr_t vs_fbstart; /* aufirst + bstart */
int32_t vs_nindir; /* number of entries in indir */
int32_t vs_aulen; /* length of AU in blocks */
int32_t vs_auimlen; /* length of imap in blocks */
int32_t vs_auemlen; /* length of emap in blocks */
int32_t vs_auilen; /* length of ilist in blocks */
int32_t vs_aupad; /* length of pad in blocks */
int32_t vs_aublocks; /* data blocks in AU */
int32_t vs_maxtier; /* log base 2 of aublocks */
int32_t vs_inopb; /* number of inodes per blk */
int32_t vs_old_inopau; /* obsolete */
int32_t vs_old_inopilb; /* obsolete */
int32_t vs_old_ndiripau; /* obsolete */
int32_t vs_iaddrlen; /* size of indirect addr ext. */
int32_t vs_bshift; /* log base 2 of bsize */
int32_t vs_inoshift; /* log base 2 of inobp */
int32_t vs_bmask; /* ~( bsize - 1 ) */
int32_t vs_boffmask; /* bsize - 1 */
int32_t vs_old_inomask; /* old_inopilb - 1 */
int32_t vs_checksum; /* checksum of V1 data */
/*
* Version 1, writable
*/
int32_t vs_free; /* number of free blocks */
int32_t vs_ifree; /* number of free inodes */
int32_t vs_efree[VXFS_NEFREE]; /* number of free extents by size */
int32_t vs_flags; /* flags ?!? */
u_int8_t vs_mod; /* filesystem has been changed */
u_int8_t vs_clean; /* clean FS */
u_int16_t __unused4; /* unused */
u_int32_t vs_firstlogid; /* mount time log ID */
u_int32_t vs_wtime; /* last time written - sec */
u_int32_t vs_wutime; /* last time written - usec */
u_int8_t vs_fname[6]; /* FS name */
u_int8_t vs_fpack[6]; /* FS pack name */
int32_t vs_logversion; /* log format version */
int32_t __unused5; /* unused */
/*
* Version 2, Read-only
*/
vx_daddr_t vs_oltext[2]; /* OLT extent and replica */
int32_t vs_oltsize; /* OLT extent size */
int32_t vs_iauimlen; /* size of inode map */
int32_t vs_iausize; /* size of IAU in blocks */
int32_t vs_dinosize; /* size of inode in bytes */
int32_t vs_old_dniaddr; /* indir levels per inode */
int32_t vs_checksum2; /* checksum of V2 RO */
/*
* Actually much more...
*/
};
/*
* In core superblock filesystem private data for VxFS.
*/
struct vxfs_sb_info {
struct vxfs_sb *vsi_raw; /* raw (on disk) superblock */
struct buffer_head *vsi_bp; /* buffer for raw superblock*/
struct inode *vsi_fship; /* fileset header inode */
struct inode *vsi_ilist; /* inode list inode */
struct inode *vsi_stilist; /* structural inode list inode */
u_long vsi_iext; /* initial inode list */
ino_t vsi_fshino; /* fileset header inode */
daddr_t vsi_oltext; /* OLT extent */
daddr_t vsi_oltsize; /* OLT size */
};
/*
* File modes. File types above 0xf000 are vxfs internal only, they should
* not be passed back to higher levels of the system. vxfs file types must
* never have one of the regular file type bits set.
*/
enum vxfs_mode {
VXFS_ISUID = 0x00000800, /* setuid */
VXFS_ISGID = 0x00000400, /* setgid */
VXFS_ISVTX = 0x00000200, /* sticky bit */
VXFS_IREAD = 0x00000100, /* read */
VXFS_IWRITE = 0x00000080, /* write */
VXFS_IEXEC = 0x00000040, /* exec */
VXFS_IFIFO = 0x00001000, /* Named pipe */
VXFS_IFCHR = 0x00002000, /* Character device */
VXFS_IFDIR = 0x00004000, /* Directory */
VXFS_IFNAM = 0x00005000, /* Xenix device ?? */
VXFS_IFBLK = 0x00006000, /* Block device */
VXFS_IFREG = 0x00008000, /* Regular file */
VXFS_IFCMP = 0x00009000, /* Compressed file ?!? */
VXFS_IFLNK = 0x0000a000, /* Symlink */
VXFS_IFSOC = 0x0000c000, /* Socket */
/* VxFS internal */
VXFS_IFFSH = 0x10000000, /* Fileset header */
VXFS_IFILT = 0x20000000, /* Inode list */
VXFS_IFIAU = 0x30000000, /* Inode allocation unit */
VXFS_IFCUT = 0x40000000, /* Current usage table */
VXFS_IFATT = 0x50000000, /* Attr. inode */
VXFS_IFLCT = 0x60000000, /* Link count table */
VXFS_IFIAT = 0x70000000, /* Indirect attribute file */
VXFS_IFEMR = 0x80000000, /* Extent map reorg file */
VXFS_IFQUO = 0x90000000, /* BSD quota file */
VXFS_IFPTI = 0xa0000000, /* "Pass through" inode */
VXFS_IFLAB = 0x11000000, /* Device label file */
VXFS_IFOLT = 0x12000000, /* OLT file */
VXFS_IFLOG = 0x13000000, /* Log file */
VXFS_IFEMP = 0x14000000, /* Extent map file */
VXFS_IFEAU = 0x15000000, /* Extent AU file */
VXFS_IFAUS = 0x16000000, /* Extent AU summary file */
VXFS_IFDEV = 0x17000000, /* Device config file */
};
#define VXFS_TYPE_MASK 0xfffff000
#define VXFS_IS_TYPE(ip,type) (((ip)->vii_mode & VXFS_TYPE_MASK) == (type))
#define VXFS_ISFIFO(x) VXFS_IS_TYPE((x),VXFS_IFIFO)
#define VXFS_ISCHR(x) VXFS_IS_TYPE((x),VXFS_IFCHR)
#define VXFS_ISDIR(x) VXFS_IS_TYPE((x),VXFS_IFDIR)
#define VXFS_ISNAM(x) VXFS_IS_TYPE((x),VXFS_IFNAM)
#define VXFS_ISBLK(x) VXFS_IS_TYPE((x),VXFS_IFBLK)
#define VXFS_ISLNK(x) VXFS_IS_TYPE((x),VXFS_IFLNK)
#define VXFS_ISREG(x) VXFS_IS_TYPE((x),VXFS_IFREG)
#define VXFS_ISCMP(x) VXFS_IS_TYPE((x),VXFS_IFCMP)
#define VXFS_ISSOC(x) VXFS_IS_TYPE((x),VXFS_IFSOC)
#define VXFS_ISFSH(x) VXFS_IS_TYPE((x),VXFS_IFFSH)
#define VXFS_ISILT(x) VXFS_IS_TYPE((x),VXFS_IFILT)
/*
* Inmode organisation types.
*/
enum {
VXFS_ORG_NONE = 0, /* Inode has *no* format ?!? */
VXFS_ORG_EXT4 = 1, /* Ext4 */
VXFS_ORG_IMMED = 2, /* All data stored in inode */
VXFS_ORG_TYPED = 3, /* Typed extents */
};
#define VXFS_IS_ORG(ip,org) ((ip)->vii_orgtype == (org))
#define VXFS_ISNONE(ip) VXFS_IS_ORG((ip), VXFS_ORG_NONE)
#define VXFS_ISEXT4(ip) VXFS_IS_ORG((ip), VXFS_ORG_EXT4)
#define VXFS_ISIMMED(ip) VXFS_IS_ORG((ip), VXFS_ORG_IMMED)
#define VXFS_ISTYPED(ip) VXFS_IS_ORG((ip), VXFS_ORG_TYPED)
/*
* Get filesystem private data from VFS inode.
*/
#define VXFS_INO(ip) \
((struct vxfs_inode_info *)(ip)->i_private)
/*
* Get filesystem private data from VFS superblock.
*/
#define VXFS_SBI(sbp) \
((struct vxfs_sb_info *)(sbp)->s_fs_info)
#endif /* _VXFS_SUPER_H_ */
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