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12#include <linux/mutex.h>
13#include <linux/pagemap.h>
14#include <linux/buffer_head.h>
15#include <linux/slab.h>
16
17#include "hpfs.h"
18
19#define EIOERROR EIO
20#define EFSERROR EPERM
21#define EMEMERROR ENOMEM
22
23#define ANODE_ALLOC_FWD 512
24#define FNODE_ALLOC_FWD 0
25#define ALLOC_FWD_MIN 16
26#define ALLOC_FWD_MAX 128
27#define ALLOC_M 1
28#define FNODE_RD_AHEAD 16
29#define ANODE_RD_AHEAD 16
30#define DNODE_RD_AHEAD 4
31
32#define FREE_DNODES_ADD 58
33#define FREE_DNODES_DEL 29
34
35#define CHKCOND(x,y) if (!(x)) printk y
36
37#ifdef DBG
38#define PRINTK(x) printk x
39#else
40#undef PRINTK
41#define PRINTK(x)
42#endif
43
44struct hpfs_inode_info {
45 loff_t mmu_private;
46 ino_t i_parent_dir;
47 unsigned i_dno;
48 unsigned i_dpos;
49 unsigned i_dsubdno;
50 unsigned i_file_sec;
51 unsigned i_disk_sec;
52 unsigned i_n_secs;
53 unsigned i_ea_size;
54 unsigned i_conv : 2;
55 unsigned i_ea_mode : 1;
56 unsigned i_ea_uid : 1;
57 unsigned i_ea_gid : 1;
58 unsigned i_dirty : 1;
59 struct mutex i_mutex;
60 struct mutex i_parent_mutex;
61 loff_t **i_rddir_off;
62 struct inode vfs_inode;
63};
64
65struct hpfs_sb_info {
66 ino_t sb_root;
67 unsigned sb_fs_size;
68 unsigned sb_bitmaps;
69 unsigned sb_dirband_start;
70 unsigned sb_dirband_size;
71 unsigned sb_dmap;
72 unsigned sb_n_free;
73 unsigned sb_n_free_dnodes;
74 uid_t sb_uid;
75 gid_t sb_gid;
76 umode_t sb_mode;
77 unsigned sb_conv : 2;
78 unsigned sb_eas : 2;
79 unsigned sb_err : 2;
80 unsigned sb_chk : 2;
81 unsigned sb_lowercase : 1;
82 unsigned sb_was_error : 1;
83 unsigned sb_chkdsk : 2;
84 unsigned char *sb_cp_table;
85
86
87 unsigned *sb_bmp_dir;
88 unsigned sb_c_bitmap;
89 unsigned sb_max_fwd_alloc;
90 struct semaphore hpfs_creation_de;
91
92
93 int sb_timeshift;
94};
95
96
97
98
99
100#define CONV_BINARY 0
101#define CONV_TEXT 1
102#define CONV_AUTO 2
103
104
105
106struct quad_buffer_head {
107 struct buffer_head *bh[4];
108 void *data;
109};
110
111
112
113static inline dnode_secno de_down_pointer (struct hpfs_dirent *de)
114{
115 CHKCOND(de->down,("HPFS: de_down_pointer: !de->down\n"));
116 return *(dnode_secno *) ((void *) de + de->length - 4);
117}
118
119
120
121static inline struct hpfs_dirent *dnode_first_de (struct dnode *dnode)
122{
123 return (void *) dnode->dirent;
124}
125
126
127
128static inline struct hpfs_dirent *dnode_end_de (struct dnode *dnode)
129{
130 CHKCOND(dnode->first_free>=0x14 && dnode->first_free<=0xa00,("HPFS: dnode_end_de: dnode->first_free = %d\n",(int)dnode->first_free));
131 return (void *) dnode + dnode->first_free;
132}
133
134
135
136static inline struct hpfs_dirent *de_next_de (struct hpfs_dirent *de)
137{
138 CHKCOND(de->length>=0x20 && de->length<0x800,("HPFS: de_next_de: de->length = %d\n",(int)de->length));
139 return (void *) de + de->length;
140}
141
142static inline struct extended_attribute *fnode_ea(struct fnode *fnode)
143{
144 return (struct extended_attribute *)((char *)fnode + fnode->ea_offs + fnode->acl_size_s);
145}
146
147static inline struct extended_attribute *fnode_end_ea(struct fnode *fnode)
148{
149 return (struct extended_attribute *)((char *)fnode + fnode->ea_offs + fnode->acl_size_s + fnode->ea_size_s);
150}
151
152static inline struct extended_attribute *next_ea(struct extended_attribute *ea)
153{
154 return (struct extended_attribute *)((char *)ea + 5 + ea->namelen + ea->valuelen);
155}
156
157static inline secno ea_sec(struct extended_attribute *ea)
158{
159 return *(secno *)((char *)ea + 9 + ea->namelen);
160}
161
162static inline secno ea_len(struct extended_attribute *ea)
163{
164 return *(secno *)((char *)ea + 5 + ea->namelen);
165}
166
167static inline char *ea_data(struct extended_attribute *ea)
168{
169 return (char *)((char *)ea + 5 + ea->namelen);
170}
171
172static inline unsigned de_size(int namelen, secno down_ptr)
173{
174 return ((0x1f + namelen + 3) & ~3) + (down_ptr ? 4 : 0);
175}
176
177static inline void copy_de(struct hpfs_dirent *dst, struct hpfs_dirent *src)
178{
179 int a;
180 int n;
181 if (!dst || !src) return;
182 a = dst->down;
183 n = dst->not_8x3;
184 memcpy((char *)dst + 2, (char *)src + 2, 28);
185 dst->down = a;
186 dst->not_8x3 = n;
187}
188
189static inline unsigned tstbits(unsigned *bmp, unsigned b, unsigned n)
190{
191 int i;
192 if ((b >= 0x4000) || (b + n - 1 >= 0x4000)) return n;
193 if (!((bmp[(b & 0x3fff) >> 5] >> (b & 0x1f)) & 1)) return 1;
194 for (i = 1; i < n; i++)
195 if ( !((bmp[((b+i) & 0x3fff) >> 5] >> ((b+i) & 0x1f)) & 1))
196 return i + 1;
197 return 0;
198}
199
200
201
202int hpfs_chk_sectors(struct super_block *, secno, int, char *);
203secno hpfs_alloc_sector(struct super_block *, secno, unsigned, int, int);
204int hpfs_alloc_if_possible(struct super_block *, secno);
205void hpfs_free_sectors(struct super_block *, secno, unsigned);
206int hpfs_check_free_dnodes(struct super_block *, int);
207void hpfs_free_dnode(struct super_block *, secno);
208struct dnode *hpfs_alloc_dnode(struct super_block *, secno, dnode_secno *, struct quad_buffer_head *, int);
209struct fnode *hpfs_alloc_fnode(struct super_block *, secno, fnode_secno *, struct buffer_head **);
210struct anode *hpfs_alloc_anode(struct super_block *, secno, anode_secno *, struct buffer_head **);
211
212
213
214secno hpfs_bplus_lookup(struct super_block *, struct inode *, struct bplus_header *, unsigned, struct buffer_head *);
215secno hpfs_add_sector_to_btree(struct super_block *, secno, int, unsigned);
216void hpfs_remove_btree(struct super_block *, struct bplus_header *);
217int hpfs_ea_read(struct super_block *, secno, int, unsigned, unsigned, char *);
218int hpfs_ea_write(struct super_block *, secno, int, unsigned, unsigned, char *);
219void hpfs_ea_remove(struct super_block *, secno, int, unsigned);
220void hpfs_truncate_btree(struct super_block *, secno, int, unsigned);
221void hpfs_remove_fnode(struct super_block *, fnode_secno fno);
222
223
224
225void hpfs_lock_creation(struct super_block *);
226void hpfs_unlock_creation(struct super_block *);
227void *hpfs_map_sector(struct super_block *, unsigned, struct buffer_head **, int);
228void *hpfs_get_sector(struct super_block *, unsigned, struct buffer_head **);
229void *hpfs_map_4sectors(struct super_block *, unsigned, struct quad_buffer_head *, int);
230void *hpfs_get_4sectors(struct super_block *, unsigned, struct quad_buffer_head *);
231void hpfs_brelse4(struct quad_buffer_head *);
232void hpfs_mark_4buffers_dirty(struct quad_buffer_head *);
233
234
235
236void hpfs_set_dentry_operations(struct dentry *);
237
238
239
240struct dentry *hpfs_lookup(struct inode *, struct dentry *, struct nameidata *);
241extern const struct file_operations hpfs_dir_ops;
242
243
244
245void hpfs_add_pos(struct inode *, loff_t *);
246void hpfs_del_pos(struct inode *, loff_t *);
247struct hpfs_dirent *hpfs_add_de(struct super_block *, struct dnode *, unsigned char *, unsigned, secno);
248int hpfs_add_dirent(struct inode *, unsigned char *, unsigned, struct hpfs_dirent *, int);
249int hpfs_remove_dirent(struct inode *, dnode_secno, struct hpfs_dirent *, struct quad_buffer_head *, int);
250void hpfs_count_dnodes(struct super_block *, dnode_secno, int *, int *, int *);
251dnode_secno hpfs_de_as_down_as_possible(struct super_block *, dnode_secno dno);
252struct hpfs_dirent *map_pos_dirent(struct inode *, loff_t *, struct quad_buffer_head *);
253struct hpfs_dirent *map_dirent(struct inode *, dnode_secno, char *, unsigned, dnode_secno *, struct quad_buffer_head *);
254void hpfs_remove_dtree(struct super_block *, dnode_secno);
255struct hpfs_dirent *map_fnode_dirent(struct super_block *, fnode_secno, struct fnode *, struct quad_buffer_head *);
256
257
258
259void hpfs_ea_ext_remove(struct super_block *, secno, int, unsigned);
260int hpfs_read_ea(struct super_block *, struct fnode *, char *, char *, int);
261char *hpfs_get_ea(struct super_block *, struct fnode *, char *, int *);
262void hpfs_set_ea(struct inode *, struct fnode *, char *, char *, int);
263
264
265
266int hpfs_file_fsync(struct file *, struct dentry *, int);
267extern const struct file_operations hpfs_file_ops;
268extern const struct inode_operations hpfs_file_iops;
269extern const struct address_space_operations hpfs_aops;
270
271
272
273void hpfs_init_inode(struct inode *);
274void hpfs_read_inode(struct inode *);
275void hpfs_write_inode(struct inode *);
276void hpfs_write_inode_nolock(struct inode *);
277int hpfs_setattr(struct dentry *, struct iattr *);
278void hpfs_write_if_changed(struct inode *);
279void hpfs_delete_inode(struct inode *);
280
281
282
283unsigned *hpfs_map_dnode_bitmap(struct super_block *, struct quad_buffer_head *);
284unsigned *hpfs_map_bitmap(struct super_block *, unsigned, struct quad_buffer_head *, char *);
285char *hpfs_load_code_page(struct super_block *, secno);
286secno *hpfs_load_bitmap_directory(struct super_block *, secno bmp);
287struct fnode *hpfs_map_fnode(struct super_block *s, ino_t, struct buffer_head **);
288struct anode *hpfs_map_anode(struct super_block *s, anode_secno, struct buffer_head **);
289struct dnode *hpfs_map_dnode(struct super_block *s, dnode_secno, struct quad_buffer_head *);
290dnode_secno hpfs_fnode_dno(struct super_block *s, ino_t ino);
291
292
293
294unsigned char hpfs_upcase(unsigned char *, unsigned char);
295int hpfs_chk_name(unsigned char *, unsigned *);
296char *hpfs_translate_name(struct super_block *, unsigned char *, unsigned, int, int);
297int hpfs_compare_names(struct super_block *, unsigned char *, unsigned, unsigned char *, unsigned, int);
298int hpfs_is_name_long(unsigned char *, unsigned);
299void hpfs_adjust_length(unsigned char *, unsigned *);
300void hpfs_decide_conv(struct inode *, unsigned char *, unsigned);
301
302
303
304extern const struct inode_operations hpfs_dir_iops;
305extern const struct address_space_operations hpfs_symlink_aops;
306
307static inline struct hpfs_inode_info *hpfs_i(struct inode *inode)
308{
309 return list_entry(inode, struct hpfs_inode_info, vfs_inode);
310}
311
312static inline struct hpfs_sb_info *hpfs_sb(struct super_block *sb)
313{
314 return sb->s_fs_info;
315}
316
317
318
319void hpfs_error(struct super_block *, const char *, ...)
320 __attribute__((format (printf, 2, 3)));
321int hpfs_stop_cycles(struct super_block *, int, int *, int *, char *);
322unsigned hpfs_count_one_bitmap(struct super_block *, secno);
323
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325
326
327
328static inline time_t local_to_gmt(struct super_block *s, time32_t t)
329{
330 extern struct timezone sys_tz;
331 return t + sys_tz.tz_minuteswest * 60 + hpfs_sb(s)->sb_timeshift;
332}
333
334static inline time32_t gmt_to_local(struct super_block *s, time_t t)
335{
336 extern struct timezone sys_tz;
337 return t - sys_tz.tz_minuteswest * 60 - hpfs_sb(s)->sb_timeshift;
338}
339