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linux/fs/hfs/hfs_fs.h
Matthias Kaehlcke 39f8d472f2 hfs: convert extents_lock in a mutex 
Apple Macintosh file system: The semaphore extens_lock is used as a mutex.
Convert it to the mutex API

Signed-off-by: Matthias Kaehlcke <matthias@kaehlcke.net>
Cc: Roman Zippel <zippel@linux-m68k.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-07-25 10:53:33 -07:00

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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/mutex.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 mutex 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 mutex 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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