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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 <asm/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         struct inode *rsrc_inode;
 73 
 74         struct mutex extents_lock;
 75 
 76         u16 alloc_blocks, clump_blocks;
 77         sector_t fs_blocks;
 78         /* Allocation extents from catlog record or volume header */
 79         hfs_extent_rec first_extents;
 80         u16 first_blocks;
 81         hfs_extent_rec cached_extents;
 82         u16 cached_start, cached_blocks;
 83 
 84         loff_t phys_size;
 85         struct inode vfs_inode;
 86 };
 87 
 88 #define HFS_FLG_RSRC            0x0001
 89 #define HFS_FLG_EXT_DIRTY       0x0002
 90 #define HFS_FLG_EXT_NEW         0x0004
 91 
 92 #define HFS_IS_RSRC(inode)      (HFS_I(inode)->flags & HFS_FLG_RSRC)
 93 
 94 /*
 95  * struct hfs_sb_info
 96  *
 97  * The HFS-specific part of a Linux (struct super_block)
 98  */
 99 struct hfs_sb_info {
100         struct buffer_head *mdb_bh;             /* The hfs_buffer
101                                                    holding the real
102                                                    superblock (aka VIB
103                                                    or MDB) */
104         struct hfs_mdb *mdb;
105         struct buffer_head *alt_mdb_bh;         /* The hfs_buffer holding
106                                                    the alternate superblock */
107         struct hfs_mdb *alt_mdb;
108         __be32 *bitmap;                         /* The page holding the
109                                                    allocation bitmap */
110         struct hfs_btree *ext_tree;                     /* Information about
111                                                    the extents b-tree */
112         struct hfs_btree *cat_tree;                     /* Information about
113                                                    the catalog b-tree */
114         u32 file_count;                         /* The number of
115                                                    regular files in
116                                                    the filesystem */
117         u32 folder_count;                       /* The number of
118                                                    directories in the
119                                                    filesystem */
120         u32 next_id;                            /* The next available
121                                                    file id number */
122         u32 clumpablks;                         /* The number of allocation
123                                                    blocks to try to add when
124                                                    extending a file */
125         u32 fs_start;                           /* The first 512-byte
126                                                    block represented
127                                                    in the bitmap */
128         u32 part_start;
129         u16 root_files;                         /* The number of
130                                                    regular
131                                                    (non-directory)
132                                                    files in the root
133                                                    directory */
134         u16 root_dirs;                          /* The number of
135                                                    directories in the
136                                                    root directory */
137         u16 fs_ablocks;                         /* The number of
138                                                    allocation blocks
139                                                    in the filesystem */
140         u16 free_ablocks;                       /* the number of unused
141                                                    allocation blocks
142                                                    in the filesystem */
143         u32 alloc_blksz;                        /* The size of an
144                                                    "allocation block" */
145         int s_quiet;                            /* Silent failure when
146                                                    changing owner or mode? */
147         __be32 s_type;                          /* Type for new files */
148         __be32 s_creator;                       /* Creator for new files */
149         umode_t s_file_umask;                   /* The umask applied to the
150                                                    permissions on all files */
151         umode_t s_dir_umask;                    /* The umask applied to the
152                                                    permissions on all dirs */
153         kuid_t s_uid;                           /* The uid of all files */
154         kgid_t s_gid;                           /* The gid of all files */
155 
156         int session, part;
157         struct nls_table *nls_io, *nls_disk;
158         struct mutex bitmap_lock;
159         unsigned long flags;
160         u16 blockoffset;
161         int fs_div;
162         struct super_block *sb;
163         int work_queued;                /* non-zero delayed work is queued */
164         struct delayed_work mdb_work;   /* MDB flush delayed work */
165         spinlock_t work_lock;           /* protects mdb_work and work_queued */
166 };
167 
168 #define HFS_FLG_BITMAP_DIRTY    0
169 #define HFS_FLG_MDB_DIRTY       1
170 #define HFS_FLG_ALT_MDB_DIRTY   2
171 
172 /* bitmap.c */
173 extern u32 hfs_vbm_search_free(struct super_block *, u32, u32 *);
174 extern int hfs_clear_vbm_bits(struct super_block *, u16, u16);
175 
176 /* catalog.c */
177 extern int hfs_cat_keycmp(const btree_key *, const btree_key *);
178 struct hfs_find_data;
179 extern int hfs_cat_find_brec(struct super_block *, u32, struct hfs_find_data *);
180 extern int hfs_cat_create(u32, struct inode *, struct qstr *, struct inode *);
181 extern int hfs_cat_delete(u32, struct inode *, struct qstr *);
182 extern int hfs_cat_move(u32, struct inode *, struct qstr *,
183                         struct inode *, struct qstr *);
184 extern void hfs_cat_build_key(struct super_block *, btree_key *, u32, struct qstr *);
185 
186 /* dir.c */
187 extern const struct file_operations hfs_dir_operations;
188 extern const struct inode_operations hfs_dir_inode_operations;
189 
190 /* extent.c */
191 extern int hfs_ext_keycmp(const btree_key *, const btree_key *);
192 extern int hfs_free_fork(struct super_block *, struct hfs_cat_file *, int);
193 extern int hfs_ext_write_extent(struct inode *);
194 extern int hfs_extend_file(struct inode *);
195 extern void hfs_file_truncate(struct inode *);
196 
197 extern int hfs_get_block(struct inode *, sector_t, struct buffer_head *, int);
198 
199 /* inode.c */
200 extern const struct address_space_operations hfs_aops;
201 extern const struct address_space_operations hfs_btree_aops;
202 
203 extern struct inode *hfs_new_inode(struct inode *, struct qstr *, umode_t);
204 extern void hfs_inode_write_fork(struct inode *, struct hfs_extent *, __be32 *, __be32 *);
205 extern int hfs_write_inode(struct inode *, struct writeback_control *);
206 extern int hfs_inode_setattr(struct dentry *, struct iattr *);
207 extern void hfs_inode_read_fork(struct inode *inode, struct hfs_extent *ext,
208                         __be32 log_size, __be32 phys_size, u32 clump_size);
209 extern struct inode *hfs_iget(struct super_block *, struct hfs_cat_key *, hfs_cat_rec *);
210 extern void hfs_evict_inode(struct inode *);
211 extern void hfs_delete_inode(struct inode *);
212 
213 /* attr.c */
214 extern int hfs_setxattr(struct dentry *dentry, const char *name,
215                         const void *value, size_t size, int flags);
216 extern ssize_t hfs_getxattr(struct dentry *dentry, const char *name,
217                             void *value, size_t size);
218 extern ssize_t hfs_listxattr(struct dentry *dentry, char *buffer, size_t size);
219 
220 /* mdb.c */
221 extern int hfs_mdb_get(struct super_block *);
222 extern void hfs_mdb_commit(struct super_block *);
223 extern void hfs_mdb_close(struct super_block *);
224 extern void hfs_mdb_put(struct super_block *);
225 
226 /* part_tbl.c */
227 extern int hfs_part_find(struct super_block *, sector_t *, sector_t *);
228 
229 /* string.c */
230 extern const struct dentry_operations hfs_dentry_operations;
231 
232 extern int hfs_hash_dentry(const struct dentry *, struct qstr *);
233 extern int hfs_strcmp(const unsigned char *, unsigned int,
234                       const unsigned char *, unsigned int);
235 extern int hfs_compare_dentry(const struct dentry *parent, const struct dentry *dentry,
236                 unsigned int len, const char *str, const struct qstr *name);
237 
238 /* trans.c */
239 extern void hfs_asc2mac(struct super_block *, struct hfs_name *, struct qstr *);
240 extern int hfs_mac2asc(struct super_block *, char *, const struct hfs_name *);
241 
242 /* super.c */
243 extern void hfs_mark_mdb_dirty(struct super_block *sb);
244 
245 /*
246  * There are two time systems.  Both are based on seconds since
247  * a particular time/date.
248  *      Unix:   unsigned lil-endian since 00:00 GMT, Jan. 1, 1970
249  *      mac:    unsigned big-endian since 00:00 GMT, Jan. 1, 1904
250  *
251  */
252 #define __hfs_u_to_mtime(sec)   cpu_to_be32(sec + 2082844800U - sys_tz.tz_minuteswest * 60)
253 #define __hfs_m_to_utime(sec)   (be32_to_cpu(sec) - 2082844800U  + sys_tz.tz_minuteswest * 60)
254 
255 #define HFS_I(inode)    (container_of(inode, struct hfs_inode_info, vfs_inode))
256 #define HFS_SB(sb)      ((struct hfs_sb_info *)(sb)->s_fs_info)
257 
258 #define hfs_m_to_utime(time)    (struct timespec){ .tv_sec = __hfs_m_to_utime(time) }
259 #define hfs_u_to_mtime(time)    __hfs_u_to_mtime((time).tv_sec)
260 #define hfs_mtime()             __hfs_u_to_mtime(get_seconds())
261 
262 static inline const char *hfs_mdb_name(struct super_block *sb)
263 {
264         return sb->s_id;
265 }
266 
267 static inline void hfs_bitmap_dirty(struct super_block *sb)
268 {
269         set_bit(HFS_FLG_BITMAP_DIRTY, &HFS_SB(sb)->flags);
270         hfs_mark_mdb_dirty(sb);
271 }
272 
273 #define sb_bread512(sb, sec, data) ({                   \
274         struct buffer_head *__bh;                       \
275         sector_t __block;                               \
276         loff_t __start;                                 \
277         int __offset;                                   \
278                                                         \
279         __start = (loff_t)(sec) << HFS_SECTOR_SIZE_BITS;\
280         __block = __start >> (sb)->s_blocksize_bits;    \
281         __offset = __start & ((sb)->s_blocksize - 1);   \
282         __bh = sb_bread((sb), __block);                 \
283         if (likely(__bh != NULL))                       \
284                 data = (void *)(__bh->b_data + __offset);\
285         else                                            \
286                 data = NULL;                            \
287         __bh;                                           \
288 })
289 
290 #endif
291 

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