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Linux/fs/hfs/hfs_fs.h

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  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 #ifdef pr_fmt
 13 #undef pr_fmt
 14 #endif
 15 
 16 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 17 
 18 #include <linux/slab.h>
 19 #include <linux/types.h>
 20 #include <linux/mutex.h>
 21 #include <linux/buffer_head.h>
 22 #include <linux/fs.h>
 23 #include <linux/workqueue.h>
 24 
 25 #include <asm/byteorder.h>
 26 #include <linux/uaccess.h>
 27 
 28 #include "hfs.h"
 29 
 30 #define DBG_BNODE_REFS  0x00000001
 31 #define DBG_BNODE_MOD   0x00000002
 32 #define DBG_CAT_MOD     0x00000004
 33 #define DBG_INODE       0x00000008
 34 #define DBG_SUPER       0x00000010
 35 #define DBG_EXTENT      0x00000020
 36 #define DBG_BITMAP      0x00000040
 37 
 38 //#define DBG_MASK      (DBG_EXTENT|DBG_INODE|DBG_BNODE_MOD|DBG_CAT_MOD|DBG_BITMAP)
 39 //#define DBG_MASK      (DBG_BNODE_MOD|DBG_CAT_MOD|DBG_INODE)
 40 //#define DBG_MASK      (DBG_CAT_MOD|DBG_BNODE_REFS|DBG_INODE|DBG_EXTENT)
 41 #define DBG_MASK        (0)
 42 
 43 #define hfs_dbg(flg, fmt, ...)                                  \
 44 do {                                                            \
 45         if (DBG_##flg & DBG_MASK)                               \
 46                 printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__);  \
 47 } while (0)
 48 
 49 #define hfs_dbg_cont(flg, fmt, ...)                             \
 50 do {                                                            \
 51         if (DBG_##flg & DBG_MASK)                               \
 52                 pr_cont(fmt, ##__VA_ARGS__);                    \
 53 } while (0)
 54 
 55 
 56 /*
 57  * struct hfs_inode_info
 58  *
 59  * The HFS-specific part of a Linux (struct inode)
 60  */
 61 struct hfs_inode_info {
 62         atomic_t opencnt;
 63 
 64         unsigned int flags;
 65 
 66         /* to deal with localtime ugliness */
 67         int tz_secondswest;
 68 
 69         struct hfs_cat_key cat_key;
 70 
 71         struct list_head open_dir_list;
 72         spinlock_t open_dir_lock;
 73         struct inode *rsrc_inode;
 74 
 75         struct mutex extents_lock;
 76 
 77         u16 alloc_blocks, clump_blocks;
 78         sector_t fs_blocks;
 79         /* Allocation extents from catlog record or volume header */
 80         hfs_extent_rec first_extents;
 81         u16 first_blocks;
 82         hfs_extent_rec cached_extents;
 83         u16 cached_start, cached_blocks;
 84 
 85         loff_t phys_size;
 86         struct inode vfs_inode;
 87 };
 88 
 89 #define HFS_FLG_RSRC            0x0001
 90 #define HFS_FLG_EXT_DIRTY       0x0002
 91 #define HFS_FLG_EXT_NEW         0x0004
 92 
 93 #define HFS_IS_RSRC(inode)      (HFS_I(inode)->flags & HFS_FLG_RSRC)
 94 
 95 /*
 96  * struct hfs_sb_info
 97  *
 98  * The HFS-specific part of a Linux (struct super_block)
 99  */
100 struct hfs_sb_info {
101         struct buffer_head *mdb_bh;             /* The hfs_buffer
102                                                    holding the real
103                                                    superblock (aka VIB
104                                                    or MDB) */
105         struct hfs_mdb *mdb;
106         struct buffer_head *alt_mdb_bh;         /* The hfs_buffer holding
107                                                    the alternate superblock */
108         struct hfs_mdb *alt_mdb;
109         __be32 *bitmap;                         /* The page holding the
110                                                    allocation bitmap */
111         struct hfs_btree *ext_tree;                     /* Information about
112                                                    the extents b-tree */
113         struct hfs_btree *cat_tree;                     /* Information about
114                                                    the catalog b-tree */
115         u32 file_count;                         /* The number of
116                                                    regular files in
117                                                    the filesystem */
118         u32 folder_count;                       /* The number of
119                                                    directories in the
120                                                    filesystem */
121         u32 next_id;                            /* The next available
122                                                    file id number */
123         u32 clumpablks;                         /* The number of allocation
124                                                    blocks to try to add when
125                                                    extending a file */
126         u32 fs_start;                           /* The first 512-byte
127                                                    block represented
128                                                    in the bitmap */
129         u32 part_start;
130         u16 root_files;                         /* The number of
131                                                    regular
132                                                    (non-directory)
133                                                    files in the root
134                                                    directory */
135         u16 root_dirs;                          /* The number of
136                                                    directories in the
137                                                    root directory */
138         u16 fs_ablocks;                         /* The number of
139                                                    allocation blocks
140                                                    in the filesystem */
141         u16 free_ablocks;                       /* the number of unused
142                                                    allocation blocks
143                                                    in the filesystem */
144         u32 alloc_blksz;                        /* The size of an
145                                                    "allocation block" */
146         int s_quiet;                            /* Silent failure when
147                                                    changing owner or mode? */
148         __be32 s_type;                          /* Type for new files */
149         __be32 s_creator;                       /* Creator for new files */
150         umode_t s_file_umask;                   /* The umask applied to the
151                                                    permissions on all files */
152         umode_t s_dir_umask;                    /* The umask applied to the
153                                                    permissions on all dirs */
154         kuid_t s_uid;                           /* The uid of all files */
155         kgid_t s_gid;                           /* The gid of all files */
156 
157         int session, part;
158         struct nls_table *nls_io, *nls_disk;
159         struct mutex bitmap_lock;
160         unsigned long flags;
161         u16 blockoffset;
162         int fs_div;
163         struct super_block *sb;
164         int work_queued;                /* non-zero delayed work is queued */
165         struct delayed_work mdb_work;   /* MDB flush delayed work */
166         spinlock_t work_lock;           /* protects mdb_work and work_queued */
167 };
168 
169 #define HFS_FLG_BITMAP_DIRTY    0
170 #define HFS_FLG_MDB_DIRTY       1
171 #define HFS_FLG_ALT_MDB_DIRTY   2
172 
173 /* bitmap.c */
174 extern u32 hfs_vbm_search_free(struct super_block *, u32, u32 *);
175 extern int hfs_clear_vbm_bits(struct super_block *, u16, u16);
176 
177 /* catalog.c */
178 extern int hfs_cat_keycmp(const btree_key *, const btree_key *);
179 struct hfs_find_data;
180 extern int hfs_cat_find_brec(struct super_block *, u32, struct hfs_find_data *);
181 extern int hfs_cat_create(u32, struct inode *, const struct qstr *, struct inode *);
182 extern int hfs_cat_delete(u32, struct inode *, const struct qstr *);
183 extern int hfs_cat_move(u32, struct inode *, const struct qstr *,
184                         struct inode *, const struct qstr *);
185 extern void hfs_cat_build_key(struct super_block *, btree_key *, u32, const struct qstr *);
186 
187 /* dir.c */
188 extern const struct file_operations hfs_dir_operations;
189 extern const struct inode_operations hfs_dir_inode_operations;
190 
191 /* extent.c */
192 extern int hfs_ext_keycmp(const btree_key *, const btree_key *);
193 extern int hfs_free_fork(struct super_block *, struct hfs_cat_file *, int);
194 extern int hfs_ext_write_extent(struct inode *);
195 extern int hfs_extend_file(struct inode *);
196 extern void hfs_file_truncate(struct inode *);
197 
198 extern int hfs_get_block(struct inode *, sector_t, struct buffer_head *, int);
199 
200 /* inode.c */
201 extern const struct address_space_operations hfs_aops;
202 extern const struct address_space_operations hfs_btree_aops;
203 
204 extern struct inode *hfs_new_inode(struct inode *, const struct qstr *, umode_t);
205 extern void hfs_inode_write_fork(struct inode *, struct hfs_extent *, __be32 *, __be32 *);
206 extern int hfs_write_inode(struct inode *, struct writeback_control *);
207 extern int hfs_inode_setattr(struct dentry *, struct iattr *);
208 extern void hfs_inode_read_fork(struct inode *inode, struct hfs_extent *ext,
209                         __be32 log_size, __be32 phys_size, u32 clump_size);
210 extern struct inode *hfs_iget(struct super_block *, struct hfs_cat_key *, hfs_cat_rec *);
211 extern void hfs_evict_inode(struct inode *);
212 extern void hfs_delete_inode(struct inode *);
213 
214 /* attr.c */
215 extern const struct xattr_handler *hfs_xattr_handlers[];
216 
217 /* mdb.c */
218 extern int hfs_mdb_get(struct super_block *);
219 extern void hfs_mdb_commit(struct super_block *);
220 extern void hfs_mdb_close(struct super_block *);
221 extern void hfs_mdb_put(struct super_block *);
222 
223 /* part_tbl.c */
224 extern int hfs_part_find(struct super_block *, sector_t *, sector_t *);
225 
226 /* string.c */
227 extern const struct dentry_operations hfs_dentry_operations;
228 
229 extern int hfs_hash_dentry(const struct dentry *, struct qstr *);
230 extern int hfs_strcmp(const unsigned char *, unsigned int,
231                       const unsigned char *, unsigned int);
232 extern int hfs_compare_dentry(const struct dentry *dentry,
233                 unsigned int len, const char *str, const struct qstr *name);
234 
235 /* trans.c */
236 extern void hfs_asc2mac(struct super_block *, struct hfs_name *, const struct qstr *);
237 extern int hfs_mac2asc(struct super_block *, char *, const struct hfs_name *);
238 
239 /* super.c */
240 extern void hfs_mark_mdb_dirty(struct super_block *sb);
241 
242 /*
243  * There are two time systems.  Both are based on seconds since
244  * a particular time/date.
245  *      Unix:   unsigned lil-endian since 00:00 GMT, Jan. 1, 1970
246  *      mac:    unsigned big-endian since 00:00 GMT, Jan. 1, 1904
247  *
248  */
249 #define __hfs_u_to_mtime(sec)   cpu_to_be32(sec + 2082844800U - sys_tz.tz_minuteswest * 60)
250 #define __hfs_m_to_utime(sec)   (be32_to_cpu(sec) - 2082844800U  + sys_tz.tz_minuteswest * 60)
251 
252 #define HFS_I(inode)    (container_of(inode, struct hfs_inode_info, vfs_inode))
253 #define HFS_SB(sb)      ((struct hfs_sb_info *)(sb)->s_fs_info)
254 
255 #define hfs_m_to_utime(time)    (struct timespec){ .tv_sec = __hfs_m_to_utime(time) }
256 #define hfs_u_to_mtime(time)    __hfs_u_to_mtime((time).tv_sec)
257 #define hfs_mtime()             __hfs_u_to_mtime(get_seconds())
258 
259 static inline const char *hfs_mdb_name(struct super_block *sb)
260 {
261         return sb->s_id;
262 }
263 
264 static inline void hfs_bitmap_dirty(struct super_block *sb)
265 {
266         set_bit(HFS_FLG_BITMAP_DIRTY, &HFS_SB(sb)->flags);
267         hfs_mark_mdb_dirty(sb);
268 }
269 
270 #define sb_bread512(sb, sec, data) ({                   \
271         struct buffer_head *__bh;                       \
272         sector_t __block;                               \
273         loff_t __start;                                 \
274         int __offset;                                   \
275                                                         \
276         __start = (loff_t)(sec) << HFS_SECTOR_SIZE_BITS;\
277         __block = __start >> (sb)->s_blocksize_bits;    \
278         __offset = __start & ((sb)->s_blocksize - 1);   \
279         __bh = sb_bread((sb), __block);                 \
280         if (likely(__bh != NULL))                       \
281                 data = (void *)(__bh->b_data + __offset);\
282         else                                            \
283                 data = NULL;                            \
284         __bh;                                           \
285 })
286 
287 #endif
288 

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