ext4: Retry block allocation if new blocks are allocated from system zone.
[linux-2.6] / 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/buffer_head.h>
15 #include <linux/fs.h>
16
17 #include <asm/byteorder.h>
18 #include <asm/uaccess.h>
19
20 #include "hfs.h"
21
22 #define DBG_BNODE_REFS  0x00000001
23 #define DBG_BNODE_MOD   0x00000002
24 #define DBG_CAT_MOD     0x00000004
25 #define DBG_INODE       0x00000008
26 #define DBG_SUPER       0x00000010
27 #define DBG_EXTENT      0x00000020
28 #define DBG_BITMAP      0x00000040
29
30 //#define DBG_MASK      (DBG_EXTENT|DBG_INODE|DBG_BNODE_MOD|DBG_CAT_MOD|DBG_BITMAP)
31 //#define DBG_MASK      (DBG_BNODE_MOD|DBG_CAT_MOD|DBG_INODE)
32 //#define DBG_MASK      (DBG_CAT_MOD|DBG_BNODE_REFS|DBG_INODE|DBG_EXTENT)
33 #define DBG_MASK        (0)
34
35 #define dprint(flg, fmt, args...) \
36         if (flg & DBG_MASK) printk(fmt , ## args)
37
38 /*
39  * struct hfs_inode_info
40  *
41  * The HFS-specific part of a Linux (struct inode)
42  */
43 struct hfs_inode_info {
44         atomic_t opencnt;
45
46         unsigned int flags;
47
48         /* to deal with localtime ugliness */
49         int tz_secondswest;
50
51         struct hfs_cat_key cat_key;
52
53         struct list_head open_dir_list;
54         struct inode *rsrc_inode;
55
56         struct semaphore extents_lock;
57
58         u16 alloc_blocks, clump_blocks;
59         sector_t fs_blocks;
60         /* Allocation extents from catlog record or volume header */
61         hfs_extent_rec first_extents;
62         u16 first_blocks;
63         hfs_extent_rec cached_extents;
64         u16 cached_start, cached_blocks;
65
66         loff_t phys_size;
67         struct inode vfs_inode;
68 };
69
70 #define HFS_FLG_RSRC            0x0001
71 #define HFS_FLG_EXT_DIRTY       0x0002
72 #define HFS_FLG_EXT_NEW         0x0004
73
74 #define HFS_IS_RSRC(inode)      (HFS_I(inode)->flags & HFS_FLG_RSRC)
75
76 /*
77  * struct hfs_sb_info
78  *
79  * The HFS-specific part of a Linux (struct super_block)
80  */
81 struct hfs_sb_info {
82         struct buffer_head *mdb_bh;             /* The hfs_buffer
83                                                    holding the real
84                                                    superblock (aka VIB
85                                                    or MDB) */
86         struct hfs_mdb *mdb;
87         struct buffer_head *alt_mdb_bh;         /* The hfs_buffer holding
88                                                    the alternate superblock */
89         struct hfs_mdb *alt_mdb;
90         __be32 *bitmap;                         /* The page holding the
91                                                    allocation bitmap */
92         struct hfs_btree *ext_tree;                     /* Information about
93                                                    the extents b-tree */
94         struct hfs_btree *cat_tree;                     /* Information about
95                                                    the catalog b-tree */
96         u32 file_count;                         /* The number of
97                                                    regular files in
98                                                    the filesystem */
99         u32 folder_count;                       /* The number of
100                                                    directories in the
101                                                    filesystem */
102         u32 next_id;                            /* The next available
103                                                    file id number */
104         u32 clumpablks;                         /* The number of allocation
105                                                    blocks to try to add when
106                                                    extending a file */
107         u32 fs_start;                           /* The first 512-byte
108                                                    block represented
109                                                    in the bitmap */
110         u32 part_start;
111         u16 root_files;                         /* The number of
112                                                    regular
113                                                    (non-directory)
114                                                    files in the root
115                                                    directory */
116         u16 root_dirs;                          /* The number of
117                                                    directories in the
118                                                    root directory */
119         u16 fs_ablocks;                         /* The number of
120                                                    allocation blocks
121                                                    in the filesystem */
122         u16 free_ablocks;                       /* the number of unused
123                                                    allocation blocks
124                                                    in the filesystem */
125         u32 alloc_blksz;                        /* The size of an
126                                                    "allocation block" */
127         int s_quiet;                            /* Silent failure when
128                                                    changing owner or mode? */
129         __be32 s_type;                          /* Type for new files */
130         __be32 s_creator;                       /* Creator for new files */
131         umode_t s_file_umask;                   /* The umask applied to the
132                                                    permissions on all files */
133         umode_t s_dir_umask;                    /* The umask applied to the
134                                                    permissions on all dirs */
135         uid_t s_uid;                            /* The uid of all files */
136         gid_t s_gid;                            /* The gid of all files */
137
138         int session, part;
139
140         struct nls_table *nls_io, *nls_disk;
141
142         struct semaphore bitmap_lock;
143
144         unsigned long flags;
145
146         u16 blockoffset;
147
148         int fs_div;
149
150         struct hlist_head rsrc_inodes;
151 };
152
153 #define HFS_FLG_BITMAP_DIRTY    0
154 #define HFS_FLG_MDB_DIRTY       1
155 #define HFS_FLG_ALT_MDB_DIRTY   2
156
157 /* bitmap.c */
158 extern u32 hfs_vbm_search_free(struct super_block *, u32, u32 *);
159 extern int hfs_clear_vbm_bits(struct super_block *, u16, u16);
160
161 /* catalog.c */
162 extern int hfs_cat_keycmp(const btree_key *, const btree_key *);
163 struct hfs_find_data;
164 extern int hfs_cat_find_brec(struct super_block *, u32, struct hfs_find_data *);
165 extern int hfs_cat_create(u32, struct inode *, struct qstr *, struct inode *);
166 extern int hfs_cat_delete(u32, struct inode *, struct qstr *);
167 extern int hfs_cat_move(u32, struct inode *, struct qstr *,
168                         struct inode *, struct qstr *);
169 extern void hfs_cat_build_key(struct super_block *, btree_key *, u32, struct qstr *);
170
171 /* dir.c */
172 extern const struct file_operations hfs_dir_operations;
173 extern const struct inode_operations hfs_dir_inode_operations;
174
175 /* extent.c */
176 extern int hfs_ext_keycmp(const btree_key *, const btree_key *);
177 extern int hfs_free_fork(struct super_block *, struct hfs_cat_file *, int);
178 extern void hfs_ext_write_extent(struct inode *);
179 extern int hfs_extend_file(struct inode *);
180 extern void hfs_file_truncate(struct inode *);
181
182 extern int hfs_get_block(struct inode *, sector_t, struct buffer_head *, int);
183
184 /* inode.c */
185 extern const struct address_space_operations hfs_aops;
186 extern const struct address_space_operations hfs_btree_aops;
187
188 extern struct inode *hfs_new_inode(struct inode *, struct qstr *, int);
189 extern void hfs_inode_write_fork(struct inode *, struct hfs_extent *, __be32 *, __be32 *);
190 extern int hfs_write_inode(struct inode *, int);
191 extern int hfs_inode_setattr(struct dentry *, struct iattr *);
192 extern void hfs_inode_read_fork(struct inode *inode, struct hfs_extent *ext,
193                         __be32 log_size, __be32 phys_size, u32 clump_size);
194 extern struct inode *hfs_iget(struct super_block *, struct hfs_cat_key *, hfs_cat_rec *);
195 extern void hfs_clear_inode(struct inode *);
196 extern void hfs_delete_inode(struct inode *);
197
198 /* attr.c */
199 extern int hfs_setxattr(struct dentry *dentry, const char *name,
200                         const void *value, size_t size, int flags);
201 extern ssize_t hfs_getxattr(struct dentry *dentry, const char *name,
202                             void *value, size_t size);
203 extern ssize_t hfs_listxattr(struct dentry *dentry, char *buffer, size_t size);
204
205 /* mdb.c */
206 extern int hfs_mdb_get(struct super_block *);
207 extern void hfs_mdb_commit(struct super_block *);
208 extern void hfs_mdb_close(struct super_block *);
209 extern void hfs_mdb_put(struct super_block *);
210
211 /* part_tbl.c */
212 extern int hfs_part_find(struct super_block *, sector_t *, sector_t *);
213
214 /* string.c */
215 extern struct dentry_operations hfs_dentry_operations;
216
217 extern int hfs_hash_dentry(struct dentry *, struct qstr *);
218 extern int hfs_strcmp(const unsigned char *, unsigned int,
219                       const unsigned char *, unsigned int);
220 extern int hfs_compare_dentry(struct dentry *, struct qstr *, struct qstr *);
221
222 /* trans.c */
223 extern void hfs_asc2mac(struct super_block *, struct hfs_name *, struct qstr *);
224 extern int hfs_mac2asc(struct super_block *, char *, const struct hfs_name *);
225
226 extern struct timezone sys_tz;
227
228 /*
229  * There are two time systems.  Both are based on seconds since
230  * a particular time/date.
231  *      Unix:   unsigned lil-endian since 00:00 GMT, Jan. 1, 1970
232  *      mac:    unsigned big-endian since 00:00 GMT, Jan. 1, 1904
233  *
234  */
235 #define __hfs_u_to_mtime(sec)   cpu_to_be32(sec + 2082844800U - sys_tz.tz_minuteswest * 60)
236 #define __hfs_m_to_utime(sec)   (be32_to_cpu(sec) - 2082844800U  + sys_tz.tz_minuteswest * 60)
237
238 #define HFS_I(inode)    (list_entry(inode, struct hfs_inode_info, vfs_inode))
239 #define HFS_SB(sb)      ((struct hfs_sb_info *)(sb)->s_fs_info)
240
241 #define hfs_m_to_utime(time)    (struct timespec){ .tv_sec = __hfs_m_to_utime(time) }
242 #define hfs_u_to_mtime(time)    __hfs_u_to_mtime((time).tv_sec)
243 #define hfs_mtime()             __hfs_u_to_mtime(get_seconds())
244
245 static inline const char *hfs_mdb_name(struct super_block *sb)
246 {
247         return sb->s_id;
248 }
249
250 static inline void hfs_bitmap_dirty(struct super_block *sb)
251 {
252         set_bit(HFS_FLG_BITMAP_DIRTY, &HFS_SB(sb)->flags);
253         sb->s_dirt = 1;
254 }
255
256 static inline void hfs_buffer_sync(struct buffer_head *bh)
257 {
258         while (buffer_locked(bh)) {
259                 wait_on_buffer(bh);
260         }
261         if (buffer_dirty(bh)) {
262                 ll_rw_block(WRITE, 1, &bh);
263                 wait_on_buffer(bh);
264         }
265 }
266
267 #define sb_bread512(sb, sec, data) ({                   \
268         struct buffer_head *__bh;                       \
269         sector_t __block;                               \
270         loff_t __start;                                 \
271         int __offset;                                   \
272                                                         \
273         __start = (loff_t)(sec) << HFS_SECTOR_SIZE_BITS;\
274         __block = __start >> (sb)->s_blocksize_bits;    \
275         __offset = __start & ((sb)->s_blocksize - 1);   \
276         __bh = sb_bread((sb), __block);                 \
277         if (likely(__bh != NULL))                       \
278                 data = (void *)(__bh->b_data + __offset);\
279         else                                            \
280                 data = NULL;                            \
281         __bh;                                           \
282 })
283
284 #endif