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linux-next/fs/hfs/hfs_fs.h
Arjan van de Ven 92e1d5be91 [PATCH] mark struct inode_operations const 2 
Many struct inode_operations in the kernel can be "const".  Marking them const
moves these to the .rodata section, which avoids false sharing with potential
dirty data.  In addition it'll catch accidental writes at compile time to
these shared resources.

Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-12 09:48:46 -08:00

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/*
* linux/fs/hfs/hfs_fs.h
*
* Copyright (C) 1995-1997 Paul H. Hargrove
* (C) 2003 Ardis Technologies <roman@ardistech.com>
* This file may be distributed under the terms of the GNU General Public License.
*/
#ifndef _LINUX_HFS_FS_H
#define _LINUX_HFS_FS_H
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/buffer_head.h>
#include <linux/fs.h>
#include <asm/byteorder.h>
#include <asm/uaccess.h>
#include "hfs.h"
#define DBG_BNODE_REFS 0x00000001
#define DBG_BNODE_MOD 0x00000002
#define DBG_CAT_MOD 0x00000004
#define DBG_INODE 0x00000008
#define DBG_SUPER 0x00000010
#define DBG_EXTENT 0x00000020
#define DBG_BITMAP 0x00000040
//#define DBG_MASK (DBG_EXTENT|DBG_INODE|DBG_BNODE_MOD|DBG_CAT_MOD|DBG_BITMAP)
//#define DBG_MASK (DBG_BNODE_MOD|DBG_CAT_MOD|DBG_INODE)
//#define DBG_MASK (DBG_CAT_MOD|DBG_BNODE_REFS|DBG_INODE|DBG_EXTENT)
#define DBG_MASK (0)
#define dprint(flg, fmt, args...) \
if (flg & DBG_MASK) printk(fmt , ## args)
/*
* struct hfs_inode_info
*
* The HFS-specific part of a Linux (struct inode)
*/
struct hfs_inode_info {
atomic_t opencnt;
unsigned int flags;
/* to deal with localtime ugliness */
int tz_secondswest;
struct hfs_cat_key cat_key;
struct list_head open_dir_list;
struct inode *rsrc_inode;
struct semaphore extents_lock;
u16 alloc_blocks, clump_blocks;
sector_t fs_blocks;
/* Allocation extents from catlog record or volume header */
hfs_extent_rec first_extents;
u16 first_blocks;
hfs_extent_rec cached_extents;
u16 cached_start, cached_blocks;
loff_t phys_size;
struct inode vfs_inode;
};
#define HFS_FLG_RSRC 0x0001
#define HFS_FLG_EXT_DIRTY 0x0002
#define HFS_FLG_EXT_NEW 0x0004
#define HFS_IS_RSRC(inode) (HFS_I(inode)->flags & HFS_FLG_RSRC)
/*
* struct hfs_sb_info
*
* The HFS-specific part of a Linux (struct super_block)
*/
struct hfs_sb_info {
struct buffer_head *mdb_bh; /* The hfs_buffer
holding the real
superblock (aka VIB
or MDB) */
struct hfs_mdb *mdb;
struct buffer_head *alt_mdb_bh; /* The hfs_buffer holding
the alternate superblock */
struct hfs_mdb *alt_mdb;
__be32 *bitmap; /* The page holding the
allocation bitmap */
struct hfs_btree *ext_tree; /* Information about
the extents b-tree */
struct hfs_btree *cat_tree; /* Information about
the catalog b-tree */
u32 file_count; /* The number of
regular files in
the filesystem */
u32 folder_count; /* The number of
directories in the
filesystem */
u32 next_id; /* The next available
file id number */
u32 clumpablks; /* The number of allocation
blocks to try to add when
extending a file */
u32 fs_start; /* The first 512-byte
block represented
in the bitmap */
u32 part_start;
u16 root_files; /* The number of
regular
(non-directory)
files in the root
directory */
u16 root_dirs; /* The number of
directories in the
root directory */
u16 fs_ablocks; /* The number of
allocation blocks
in the filesystem */
u16 free_ablocks; /* the number of unused
allocation blocks
in the filesystem */
u32 alloc_blksz; /* The size of an
"allocation block" */
int s_quiet; /* Silent failure when
changing owner or mode? */
__be32 s_type; /* Type for new files */
__be32 s_creator; /* Creator for new files */
umode_t s_file_umask; /* The umask applied to the
permissions on all files */
umode_t s_dir_umask; /* The umask applied to the
permissions on all dirs */
uid_t s_uid; /* The uid of all files */
gid_t s_gid; /* The gid of all files */
int session, part;
struct nls_table *nls_io, *nls_disk;
struct semaphore bitmap_lock;
unsigned long flags;
u16 blockoffset;
int fs_div;
struct hlist_head rsrc_inodes;
};
#define HFS_FLG_BITMAP_DIRTY 0
#define HFS_FLG_MDB_DIRTY 1
#define HFS_FLG_ALT_MDB_DIRTY 2
/* bitmap.c */
extern u32 hfs_vbm_search_free(struct super_block *, u32, u32 *);
extern int hfs_clear_vbm_bits(struct super_block *, u16, u16);
/* catalog.c */
extern int hfs_cat_keycmp(const btree_key *, const btree_key *);
struct hfs_find_data;
extern int hfs_cat_find_brec(struct super_block *, u32, struct hfs_find_data *);
extern int hfs_cat_create(u32, struct inode *, struct qstr *, struct inode *);
extern int hfs_cat_delete(u32, struct inode *, struct qstr *);
extern int hfs_cat_move(u32, struct inode *, struct qstr *,
struct inode *, struct qstr *);
extern void hfs_cat_build_key(struct super_block *, btree_key *, u32, struct qstr *);
/* dir.c */
extern const struct file_operations hfs_dir_operations;
extern const struct inode_operations hfs_dir_inode_operations;
/* extent.c */
extern int hfs_ext_keycmp(const btree_key *, const btree_key *);
extern int hfs_free_fork(struct super_block *, struct hfs_cat_file *, int);
extern void hfs_ext_write_extent(struct inode *);
extern int hfs_extend_file(struct inode *);
extern void hfs_file_truncate(struct inode *);
extern int hfs_get_block(struct inode *, sector_t, struct buffer_head *, int);
/* inode.c */
extern const struct address_space_operations hfs_aops;
extern const struct address_space_operations hfs_btree_aops;
extern struct inode *hfs_new_inode(struct inode *, struct qstr *, int);
extern void hfs_inode_write_fork(struct inode *, struct hfs_extent *, __be32 *, __be32 *);
extern int hfs_write_inode(struct inode *, int);
extern int hfs_inode_setattr(struct dentry *, struct iattr *);
extern void hfs_inode_read_fork(struct inode *inode, struct hfs_extent *ext,
__be32 log_size, __be32 phys_size, u32 clump_size);
extern struct inode *hfs_iget(struct super_block *, struct hfs_cat_key *, hfs_cat_rec *);
extern void hfs_clear_inode(struct inode *);
extern void hfs_delete_inode(struct inode *);
/* attr.c */
extern int hfs_setxattr(struct dentry *dentry, const char *name,
const void *value, size_t size, int flags);
extern ssize_t hfs_getxattr(struct dentry *dentry, const char *name,
void *value, size_t size);
extern ssize_t hfs_listxattr(struct dentry *dentry, char *buffer, size_t size);
/* mdb.c */
extern int hfs_mdb_get(struct super_block *);
extern void hfs_mdb_commit(struct super_block *);
extern void hfs_mdb_close(struct super_block *);
extern void hfs_mdb_put(struct super_block *);
/* part_tbl.c */
extern int hfs_part_find(struct super_block *, sector_t *, sector_t *);
/* string.c */
extern struct dentry_operations hfs_dentry_operations;
extern int hfs_hash_dentry(struct dentry *, struct qstr *);
extern int hfs_strcmp(const unsigned char *, unsigned int,
const unsigned char *, unsigned int);
extern int hfs_compare_dentry(struct dentry *, struct qstr *, struct qstr *);
/* trans.c */
extern void hfs_asc2mac(struct super_block *, struct hfs_name *, struct qstr *);
extern int hfs_mac2asc(struct super_block *, char *, const struct hfs_name *);
extern struct timezone sys_tz;
/*
* There are two time systems. Both are based on seconds since
* a particular time/date.
* Unix: unsigned lil-endian since 00:00 GMT, Jan. 1, 1970
* mac: unsigned big-endian since 00:00 GMT, Jan. 1, 1904
*
*/
#define __hfs_u_to_mtime(sec) cpu_to_be32(sec + 2082844800U - sys_tz.tz_minuteswest * 60)
#define __hfs_m_to_utime(sec) (be32_to_cpu(sec) - 2082844800U + sys_tz.tz_minuteswest * 60)
#define HFS_I(inode) (list_entry(inode, struct hfs_inode_info, vfs_inode))
#define HFS_SB(sb) ((struct hfs_sb_info *)(sb)->s_fs_info)
#define hfs_m_to_utime(time) (struct timespec){ .tv_sec = __hfs_m_to_utime(time) }
#define hfs_u_to_mtime(time) __hfs_u_to_mtime((time).tv_sec)
#define hfs_mtime() __hfs_u_to_mtime(get_seconds())
static inline const char *hfs_mdb_name(struct super_block *sb)
{
return sb->s_id;
}
static inline void hfs_bitmap_dirty(struct super_block *sb)
{
set_bit(HFS_FLG_BITMAP_DIRTY, &HFS_SB(sb)->flags);
sb->s_dirt = 1;
}
static inline void hfs_buffer_sync(struct buffer_head *bh)
{
while (buffer_locked(bh)) {
wait_on_buffer(bh);
}
if (buffer_dirty(bh)) {
ll_rw_block(WRITE, 1, &bh);
wait_on_buffer(bh);
}
}
#define sb_bread512(sb, sec, data) ({ \
struct buffer_head *__bh; \
sector_t __block; \
loff_t __start; \
int __offset; \
\
__start = (loff_t)(sec) << HFS_SECTOR_SIZE_BITS;\
__block = __start >> (sb)->s_blocksize_bits; \
__offset = __start & ((sb)->s_blocksize - 1); \
__bh = sb_bread((sb), __block); \
if (likely(__bh != NULL)) \
data = (void *)(__bh->b_data + __offset);\
else \
data = NULL; \
__bh; \
})
#endif
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