Root/fs/hfs/hfs_fs.h

1/*
2 * linux/fs/hfs/hfs_fs.h
3 *
4 * Copyright (C) 1995-1997 Paul H. Hargrove
5 * (C) 2003 Ardis Technologies <roman@ardistech.com>
6 * This file may be distributed under the terms of the GNU General Public License.
7 */
8
9#ifndef _LINUX_HFS_FS_H
10#define _LINUX_HFS_FS_H
11
12#include <linux/slab.h>
13#include <linux/types.h>
14#include <linux/mutex.h>
15#include <linux/buffer_head.h>
16#include <linux/fs.h>
17
18#include <asm/byteorder.h>
19#include <asm/uaccess.h>
20
21#include "hfs.h"
22
23#define DBG_BNODE_REFS 0x00000001
24#define DBG_BNODE_MOD 0x00000002
25#define DBG_CAT_MOD 0x00000004
26#define DBG_INODE 0x00000008
27#define DBG_SUPER 0x00000010
28#define DBG_EXTENT 0x00000020
29#define DBG_BITMAP 0x00000040
30
31//#define DBG_MASK (DBG_EXTENT|DBG_INODE|DBG_BNODE_MOD|DBG_CAT_MOD|DBG_BITMAP)
32//#define DBG_MASK (DBG_BNODE_MOD|DBG_CAT_MOD|DBG_INODE)
33//#define DBG_MASK (DBG_CAT_MOD|DBG_BNODE_REFS|DBG_INODE|DBG_EXTENT)
34#define DBG_MASK (0)
35
36#define dprint(flg, fmt, args...) \
37    if (flg & DBG_MASK) printk(fmt , ## args)
38
39/*
40 * struct hfs_inode_info
41 *
42 * The HFS-specific part of a Linux (struct inode)
43 */
44struct hfs_inode_info {
45    atomic_t opencnt;
46
47    unsigned int flags;
48
49    /* to deal with localtime ugliness */
50    int tz_secondswest;
51
52    struct hfs_cat_key cat_key;
53
54    struct list_head open_dir_list;
55    struct inode *rsrc_inode;
56
57    struct mutex extents_lock;
58
59    u16 alloc_blocks, clump_blocks;
60    sector_t fs_blocks;
61    /* Allocation extents from catlog record or volume header */
62    hfs_extent_rec first_extents;
63    u16 first_blocks;
64    hfs_extent_rec cached_extents;
65    u16 cached_start, cached_blocks;
66
67    loff_t phys_size;
68    struct inode vfs_inode;
69};
70
71#define HFS_FLG_RSRC 0x0001
72#define HFS_FLG_EXT_DIRTY 0x0002
73#define HFS_FLG_EXT_NEW 0x0004
74
75#define HFS_IS_RSRC(inode) (HFS_I(inode)->flags & HFS_FLG_RSRC)
76
77/*
78 * struct hfs_sb_info
79 *
80 * The HFS-specific part of a Linux (struct super_block)
81 */
82struct hfs_sb_info {
83    struct buffer_head *mdb_bh; /* The hfs_buffer
84                           holding the real
85                           superblock (aka VIB
86                           or MDB) */
87    struct hfs_mdb *mdb;
88    struct buffer_head *alt_mdb_bh; /* The hfs_buffer holding
89                           the alternate superblock */
90    struct hfs_mdb *alt_mdb;
91    __be32 *bitmap; /* The page holding the
92                           allocation bitmap */
93    struct hfs_btree *ext_tree; /* Information about
94                           the extents b-tree */
95    struct hfs_btree *cat_tree; /* Information about
96                           the catalog b-tree */
97    u32 file_count; /* The number of
98                           regular files in
99                           the filesystem */
100    u32 folder_count; /* The number of
101                           directories in the
102                           filesystem */
103    u32 next_id; /* The next available
104                           file id number */
105    u32 clumpablks; /* The number of allocation
106                           blocks to try to add when
107                           extending a file */
108    u32 fs_start; /* The first 512-byte
109                           block represented
110                           in the bitmap */
111    u32 part_start;
112    u16 root_files; /* The number of
113                           regular
114                           (non-directory)
115                           files in the root
116                           directory */
117    u16 root_dirs; /* The number of
118                           directories in the
119                           root directory */
120    u16 fs_ablocks; /* The number of
121                           allocation blocks
122                           in the filesystem */
123    u16 free_ablocks; /* the number of unused
124                           allocation blocks
125                           in the filesystem */
126    u32 alloc_blksz; /* The size of an
127                           "allocation block" */
128    int s_quiet; /* Silent failure when
129                           changing owner or mode? */
130    __be32 s_type; /* Type for new files */
131    __be32 s_creator; /* Creator for new files */
132    umode_t s_file_umask; /* The umask applied to the
133                           permissions on all files */
134    umode_t s_dir_umask; /* The umask applied to the
135                           permissions on all dirs */
136    uid_t s_uid; /* The uid of all files */
137    gid_t s_gid; /* The gid of all files */
138
139    int session, part;
140
141    struct nls_table *nls_io, *nls_disk;
142
143    struct mutex bitmap_lock;
144
145    unsigned long flags;
146
147    u16 blockoffset;
148
149    int fs_div;
150
151    struct hlist_head rsrc_inodes;
152};
153
154#define HFS_FLG_BITMAP_DIRTY 0
155#define HFS_FLG_MDB_DIRTY 1
156#define HFS_FLG_ALT_MDB_DIRTY 2
157
158/* bitmap.c */
159extern u32 hfs_vbm_search_free(struct super_block *, u32, u32 *);
160extern int hfs_clear_vbm_bits(struct super_block *, u16, u16);
161
162/* catalog.c */
163extern int hfs_cat_keycmp(const btree_key *, const btree_key *);
164struct hfs_find_data;
165extern int hfs_cat_find_brec(struct super_block *, u32, struct hfs_find_data *);
166extern int hfs_cat_create(u32, struct inode *, struct qstr *, struct inode *);
167extern int hfs_cat_delete(u32, struct inode *, struct qstr *);
168extern int hfs_cat_move(u32, struct inode *, struct qstr *,
169            struct inode *, struct qstr *);
170extern void hfs_cat_build_key(struct super_block *, btree_key *, u32, struct qstr *);
171
172/* dir.c */
173extern const struct file_operations hfs_dir_operations;
174extern const struct inode_operations hfs_dir_inode_operations;
175
176/* extent.c */
177extern int hfs_ext_keycmp(const btree_key *, const btree_key *);
178extern int hfs_free_fork(struct super_block *, struct hfs_cat_file *, int);
179extern void hfs_ext_write_extent(struct inode *);
180extern int hfs_extend_file(struct inode *);
181extern void hfs_file_truncate(struct inode *);
182
183extern int hfs_get_block(struct inode *, sector_t, struct buffer_head *, int);
184
185/* inode.c */
186extern const struct address_space_operations hfs_aops;
187extern const struct address_space_operations hfs_btree_aops;
188
189extern struct inode *hfs_new_inode(struct inode *, struct qstr *, int);
190extern void hfs_inode_write_fork(struct inode *, struct hfs_extent *, __be32 *, __be32 *);
191extern int hfs_write_inode(struct inode *, struct writeback_control *);
192extern int hfs_inode_setattr(struct dentry *, struct iattr *);
193extern void hfs_inode_read_fork(struct inode *inode, struct hfs_extent *ext,
194            __be32 log_size, __be32 phys_size, u32 clump_size);
195extern struct inode *hfs_iget(struct super_block *, struct hfs_cat_key *, hfs_cat_rec *);
196extern void hfs_clear_inode(struct inode *);
197extern void hfs_delete_inode(struct inode *);
198
199/* attr.c */
200extern int hfs_setxattr(struct dentry *dentry, const char *name,
201            const void *value, size_t size, int flags);
202extern ssize_t hfs_getxattr(struct dentry *dentry, const char *name,
203                void *value, size_t size);
204extern ssize_t hfs_listxattr(struct dentry *dentry, char *buffer, size_t size);
205
206/* mdb.c */
207extern int hfs_mdb_get(struct super_block *);
208extern void hfs_mdb_commit(struct super_block *);
209extern void hfs_mdb_close(struct super_block *);
210extern void hfs_mdb_put(struct super_block *);
211
212/* part_tbl.c */
213extern int hfs_part_find(struct super_block *, sector_t *, sector_t *);
214
215/* string.c */
216extern const struct dentry_operations hfs_dentry_operations;
217
218extern int hfs_hash_dentry(struct dentry *, struct qstr *);
219extern int hfs_strcmp(const unsigned char *, unsigned int,
220              const unsigned char *, unsigned int);
221extern int hfs_compare_dentry(struct dentry *, struct qstr *, struct qstr *);
222
223/* trans.c */
224extern void hfs_asc2mac(struct super_block *, struct hfs_name *, struct qstr *);
225extern int hfs_mac2asc(struct super_block *, char *, const struct hfs_name *);
226
227extern struct timezone sys_tz;
228
229/*
230 * There are two time systems. Both are based on seconds since
231 * a particular time/date.
232 * Unix: unsigned lil-endian since 00:00 GMT, Jan. 1, 1970
233 * mac: unsigned big-endian since 00:00 GMT, Jan. 1, 1904
234 *
235 */
236#define __hfs_u_to_mtime(sec) cpu_to_be32(sec + 2082844800U - sys_tz.tz_minuteswest * 60)
237#define __hfs_m_to_utime(sec) (be32_to_cpu(sec) - 2082844800U + sys_tz.tz_minuteswest * 60)
238
239#define HFS_I(inode) (list_entry(inode, struct hfs_inode_info, vfs_inode))
240#define HFS_SB(sb) ((struct hfs_sb_info *)(sb)->s_fs_info)
241
242#define hfs_m_to_utime(time) (struct timespec){ .tv_sec = __hfs_m_to_utime(time) }
243#define hfs_u_to_mtime(time) __hfs_u_to_mtime((time).tv_sec)
244#define hfs_mtime() __hfs_u_to_mtime(get_seconds())
245
246static inline const char *hfs_mdb_name(struct super_block *sb)
247{
248    return sb->s_id;
249}
250
251static inline void hfs_bitmap_dirty(struct super_block *sb)
252{
253    set_bit(HFS_FLG_BITMAP_DIRTY, &HFS_SB(sb)->flags);
254    sb->s_dirt = 1;
255}
256
257static inline void hfs_buffer_sync(struct buffer_head *bh)
258{
259    while (buffer_locked(bh)) {
260        wait_on_buffer(bh);
261    }
262    if (buffer_dirty(bh)) {
263        ll_rw_block(WRITE, 1, &bh);
264        wait_on_buffer(bh);
265    }
266}
267
268#define sb_bread512(sb, sec, data) ({ \
269    struct buffer_head *__bh; \
270    sector_t __block; \
271    loff_t __start; \
272    int __offset; \
273                            \
274    __start = (loff_t)(sec) << HFS_SECTOR_SIZE_BITS;\
275    __block = __start >> (sb)->s_blocksize_bits; \
276    __offset = __start & ((sb)->s_blocksize - 1); \
277    __bh = sb_bread((sb), __block); \
278    if (likely(__bh != NULL)) \
279        data = (void *)(__bh->b_data + __offset);\
280    else \
281        data = NULL; \
282    __bh; \
283})
284
285#endif
286

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