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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/fs/hpfs/hpfs_fn.h
3 *
4 * Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999
5 *
6 * function headers
7 */
8
9//#define DBG
10//#define DEBUG_LOCKS
11
Ingo Molnar7bf6d782006-03-23 03:00:42 -080012#include <linux/mutex.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070013#include <linux/pagemap.h>
14#include <linux/buffer_head.h>
15#include <linux/hpfs_fs.h>
16#include <linux/slab.h>
17#include <linux/smp_lock.h>
18
19#include "hpfs.h"
20
21#define EIOERROR EIO
22#define EFSERROR EPERM
23#define EMEMERROR ENOMEM
24
25#define ANODE_ALLOC_FWD 512
26#define FNODE_ALLOC_FWD 0
27#define ALLOC_FWD_MIN 16
28#define ALLOC_FWD_MAX 128
29#define ALLOC_M 1
30#define FNODE_RD_AHEAD 16
31#define ANODE_RD_AHEAD 16
32#define DNODE_RD_AHEAD 4
33
34#define FREE_DNODES_ADD 58
35#define FREE_DNODES_DEL 29
36
37#define CHKCOND(x,y) if (!(x)) printk y
38
39#ifdef DBG
40#define PRINTK(x) printk x
41#else
42#undef PRINTK
43#define PRINTK(x)
44#endif
45
46struct hpfs_inode_info {
47 loff_t mmu_private;
48 ino_t i_parent_dir; /* (directories) gives fnode of parent dir */
49 unsigned i_dno; /* (directories) root dnode */
50 unsigned i_dpos; /* (directories) temp for readdir */
51 unsigned i_dsubdno; /* (directories) temp for readdir */
52 unsigned i_file_sec; /* (files) minimalist cache of alloc info */
53 unsigned i_disk_sec; /* (files) minimalist cache of alloc info */
54 unsigned i_n_secs; /* (files) minimalist cache of alloc info */
55 unsigned i_ea_size; /* size of extended attributes */
56 unsigned i_conv : 2; /* (files) crlf->newline hackery */
57 unsigned i_ea_mode : 1; /* file's permission is stored in ea */
58 unsigned i_ea_uid : 1; /* file's uid is stored in ea */
59 unsigned i_ea_gid : 1; /* file's gid is stored in ea */
60 unsigned i_dirty : 1;
Ingo Molnar7bf6d782006-03-23 03:00:42 -080061 struct mutex i_mutex;
62 struct mutex i_parent_mutex;
Linus Torvalds1da177e2005-04-16 15:20:36 -070063 loff_t **i_rddir_off;
64 struct inode vfs_inode;
65};
66
67struct hpfs_sb_info {
68 ino_t sb_root; /* inode number of root dir */
69 unsigned sb_fs_size; /* file system size, sectors */
70 unsigned sb_bitmaps; /* sector number of bitmap list */
71 unsigned sb_dirband_start; /* directory band start sector */
72 unsigned sb_dirband_size; /* directory band size, dnodes */
73 unsigned sb_dmap; /* sector number of dnode bit map */
74 unsigned sb_n_free; /* free blocks for statfs, or -1 */
75 unsigned sb_n_free_dnodes; /* free dnodes for statfs, or -1 */
76 uid_t sb_uid; /* uid from mount options */
77 gid_t sb_gid; /* gid from mount options */
78 umode_t sb_mode; /* mode from mount options */
79 unsigned sb_conv : 2; /* crlf->newline hackery */
80 unsigned sb_eas : 2; /* eas: 0-ignore, 1-ro, 2-rw */
81 unsigned sb_err : 2; /* on errs: 0-cont, 1-ro, 2-panic */
82 unsigned sb_chk : 2; /* checks: 0-no, 1-normal, 2-strict */
83 unsigned sb_lowercase : 1; /* downcase filenames hackery */
84 unsigned sb_was_error : 1; /* there was an error, set dirty flag */
85 unsigned sb_chkdsk : 2; /* chkdsk: 0-no, 1-on errs, 2-allways */
86 unsigned char *sb_cp_table; /* code page tables: */
87 /* 128 bytes uppercasing table & */
88 /* 128 bytes lowercasing table */
89 unsigned *sb_bmp_dir; /* main bitmap directory */
90 unsigned sb_c_bitmap; /* current bitmap */
91 unsigned sb_max_fwd_alloc; /* max forwad allocation */
92 struct semaphore hpfs_creation_de; /* when creating dirents, nobody else
93 can alloc blocks */
94 /*unsigned sb_mounting : 1;*/
95 int sb_timeshift;
96};
97
98/*
99 * conv= options
100 */
101
102#define CONV_BINARY 0 /* no conversion */
103#define CONV_TEXT 1 /* crlf->newline */
104#define CONV_AUTO 2 /* decide based on file contents */
105
106/* Four 512-byte buffers and the 2k block obtained by concatenating them */
107
108struct quad_buffer_head {
109 struct buffer_head *bh[4];
110 void *data;
111};
112
113/* The b-tree down pointer from a dir entry */
114
115static inline dnode_secno de_down_pointer (struct hpfs_dirent *de)
116{
117 CHKCOND(de->down,("HPFS: de_down_pointer: !de->down\n"));
118 return *(dnode_secno *) ((void *) de + de->length - 4);
119}
120
121/* The first dir entry in a dnode */
122
123static inline struct hpfs_dirent *dnode_first_de (struct dnode *dnode)
124{
125 return (void *) dnode->dirent;
126}
127
128/* The end+1 of the dir entries */
129
130static inline struct hpfs_dirent *dnode_end_de (struct dnode *dnode)
131{
132 CHKCOND(dnode->first_free>=0x14 && dnode->first_free<=0xa00,("HPFS: dnode_end_de: dnode->first_free = %d\n",(int)dnode->first_free));
133 return (void *) dnode + dnode->first_free;
134}
135
136/* The dir entry after dir entry de */
137
138static inline struct hpfs_dirent *de_next_de (struct hpfs_dirent *de)
139{
140 CHKCOND(de->length>=0x20 && de->length<0x800,("HPFS: de_next_de: de->length = %d\n",(int)de->length));
141 return (void *) de + de->length;
142}
143
144static inline struct extended_attribute *fnode_ea(struct fnode *fnode)
145{
146 return (struct extended_attribute *)((char *)fnode + fnode->ea_offs + fnode->acl_size_s);
147}
148
149static inline struct extended_attribute *fnode_end_ea(struct fnode *fnode)
150{
151 return (struct extended_attribute *)((char *)fnode + fnode->ea_offs + fnode->acl_size_s + fnode->ea_size_s);
152}
153
154static inline struct extended_attribute *next_ea(struct extended_attribute *ea)
155{
156 return (struct extended_attribute *)((char *)ea + 5 + ea->namelen + ea->valuelen);
157}
158
159static inline secno ea_sec(struct extended_attribute *ea)
160{
161 return *(secno *)((char *)ea + 9 + ea->namelen);
162}
163
164static inline secno ea_len(struct extended_attribute *ea)
165{
166 return *(secno *)((char *)ea + 5 + ea->namelen);
167}
168
169static inline char *ea_data(struct extended_attribute *ea)
170{
171 return (char *)((char *)ea + 5 + ea->namelen);
172}
173
174static inline unsigned de_size(int namelen, secno down_ptr)
175{
176 return ((0x1f + namelen + 3) & ~3) + (down_ptr ? 4 : 0);
177}
178
179static inline void copy_de(struct hpfs_dirent *dst, struct hpfs_dirent *src)
180{
181 int a;
182 int n;
183 if (!dst || !src) return;
184 a = dst->down;
185 n = dst->not_8x3;
186 memcpy((char *)dst + 2, (char *)src + 2, 28);
187 dst->down = a;
188 dst->not_8x3 = n;
189}
190
191static inline unsigned tstbits(unsigned *bmp, unsigned b, unsigned n)
192{
193 int i;
194 if ((b >= 0x4000) || (b + n - 1 >= 0x4000)) return n;
195 if (!((bmp[(b & 0x3fff) >> 5] >> (b & 0x1f)) & 1)) return 1;
196 for (i = 1; i < n; i++)
197 if (/*b+i < 0x4000 &&*/ !((bmp[((b+i) & 0x3fff) >> 5] >> ((b+i) & 0x1f)) & 1))
198 return i + 1;
199 return 0;
200}
201
202/* alloc.c */
203
204int hpfs_chk_sectors(struct super_block *, secno, int, char *);
205secno hpfs_alloc_sector(struct super_block *, secno, unsigned, int, int);
206int hpfs_alloc_if_possible(struct super_block *, secno);
207void hpfs_free_sectors(struct super_block *, secno, unsigned);
208int hpfs_check_free_dnodes(struct super_block *, int);
209void hpfs_free_dnode(struct super_block *, secno);
210struct dnode *hpfs_alloc_dnode(struct super_block *, secno, dnode_secno *, struct quad_buffer_head *, int);
211struct fnode *hpfs_alloc_fnode(struct super_block *, secno, fnode_secno *, struct buffer_head **);
212struct anode *hpfs_alloc_anode(struct super_block *, secno, anode_secno *, struct buffer_head **);
213
214/* anode.c */
215
216secno hpfs_bplus_lookup(struct super_block *, struct inode *, struct bplus_header *, unsigned, struct buffer_head *);
217secno hpfs_add_sector_to_btree(struct super_block *, secno, int, unsigned);
218void hpfs_remove_btree(struct super_block *, struct bplus_header *);
219int hpfs_ea_read(struct super_block *, secno, int, unsigned, unsigned, char *);
220int hpfs_ea_write(struct super_block *, secno, int, unsigned, unsigned, char *);
221void hpfs_ea_remove(struct super_block *, secno, int, unsigned);
222void hpfs_truncate_btree(struct super_block *, secno, int, unsigned);
223void hpfs_remove_fnode(struct super_block *, fnode_secno fno);
224
225/* buffer.c */
226
227void hpfs_lock_creation(struct super_block *);
228void hpfs_unlock_creation(struct super_block *);
229void *hpfs_map_sector(struct super_block *, unsigned, struct buffer_head **, int);
230void *hpfs_get_sector(struct super_block *, unsigned, struct buffer_head **);
231void *hpfs_map_4sectors(struct super_block *, unsigned, struct quad_buffer_head *, int);
232void *hpfs_get_4sectors(struct super_block *, unsigned, struct quad_buffer_head *);
233void hpfs_brelse4(struct quad_buffer_head *);
234void hpfs_mark_4buffers_dirty(struct quad_buffer_head *);
235
236/* dentry.c */
237
238void hpfs_set_dentry_operations(struct dentry *);
239
240/* dir.c */
241
242struct dentry *hpfs_lookup(struct inode *, struct dentry *, struct nameidata *);
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -0800243extern const struct file_operations hpfs_dir_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244
245/* dnode.c */
246
247void hpfs_add_pos(struct inode *, loff_t *);
248void hpfs_del_pos(struct inode *, loff_t *);
249struct hpfs_dirent *hpfs_add_de(struct super_block *, struct dnode *, unsigned char *, unsigned, secno);
250int hpfs_add_dirent(struct inode *, unsigned char *, unsigned, struct hpfs_dirent *, int);
251int hpfs_remove_dirent(struct inode *, dnode_secno, struct hpfs_dirent *, struct quad_buffer_head *, int);
252void hpfs_count_dnodes(struct super_block *, dnode_secno, int *, int *, int *);
253dnode_secno hpfs_de_as_down_as_possible(struct super_block *, dnode_secno dno);
254struct hpfs_dirent *map_pos_dirent(struct inode *, loff_t *, struct quad_buffer_head *);
255struct hpfs_dirent *map_dirent(struct inode *, dnode_secno, char *, unsigned, dnode_secno *, struct quad_buffer_head *);
256void hpfs_remove_dtree(struct super_block *, dnode_secno);
257struct hpfs_dirent *map_fnode_dirent(struct super_block *, fnode_secno, struct fnode *, struct quad_buffer_head *);
258
259/* ea.c */
260
261void hpfs_ea_ext_remove(struct super_block *, secno, int, unsigned);
262int hpfs_read_ea(struct super_block *, struct fnode *, char *, char *, int);
263char *hpfs_get_ea(struct super_block *, struct fnode *, char *, int *);
264void hpfs_set_ea(struct inode *, struct fnode *, char *, char *, int);
265
266/* file.c */
267
268int hpfs_file_fsync(struct file *, struct dentry *, int);
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -0800269extern const struct file_operations hpfs_file_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270extern struct inode_operations hpfs_file_iops;
271extern struct address_space_operations hpfs_aops;
272
273/* inode.c */
274
275void hpfs_init_inode(struct inode *);
276void hpfs_read_inode(struct inode *);
277void hpfs_write_inode(struct inode *);
278void hpfs_write_inode_nolock(struct inode *);
279int hpfs_notify_change(struct dentry *, struct iattr *);
280void hpfs_write_if_changed(struct inode *);
281void hpfs_delete_inode(struct inode *);
282
283/* map.c */
284
285unsigned *hpfs_map_dnode_bitmap(struct super_block *, struct quad_buffer_head *);
286unsigned *hpfs_map_bitmap(struct super_block *, unsigned, struct quad_buffer_head *, char *);
287char *hpfs_load_code_page(struct super_block *, secno);
288secno *hpfs_load_bitmap_directory(struct super_block *, secno bmp);
289struct fnode *hpfs_map_fnode(struct super_block *s, ino_t, struct buffer_head **);
290struct anode *hpfs_map_anode(struct super_block *s, anode_secno, struct buffer_head **);
291struct dnode *hpfs_map_dnode(struct super_block *s, dnode_secno, struct quad_buffer_head *);
292dnode_secno hpfs_fnode_dno(struct super_block *s, ino_t ino);
293
294/* name.c */
295
296unsigned char hpfs_upcase(unsigned char *, unsigned char);
297int hpfs_chk_name(unsigned char *, unsigned *);
298char *hpfs_translate_name(struct super_block *, unsigned char *, unsigned, int, int);
299int hpfs_compare_names(struct super_block *, unsigned char *, unsigned, unsigned char *, unsigned, int);
300int hpfs_is_name_long(unsigned char *, unsigned);
301void hpfs_adjust_length(unsigned char *, unsigned *);
302void hpfs_decide_conv(struct inode *, unsigned char *, unsigned);
303
304/* namei.c */
305
306extern struct inode_operations hpfs_dir_iops;
307extern struct address_space_operations hpfs_symlink_aops;
308
309static inline struct hpfs_inode_info *hpfs_i(struct inode *inode)
310{
311 return list_entry(inode, struct hpfs_inode_info, vfs_inode);
312}
313
314static inline struct hpfs_sb_info *hpfs_sb(struct super_block *sb)
315{
316 return sb->s_fs_info;
317}
318
319/* super.c */
320
321void hpfs_error(struct super_block *, char *, ...);
322int hpfs_stop_cycles(struct super_block *, int, int *, int *, char *);
323unsigned hpfs_count_one_bitmap(struct super_block *, secno);
324
325/*
326 * local time (HPFS) to GMT (Unix)
327 */
328
329static inline time_t local_to_gmt(struct super_block *s, time32_t t)
330{
331 extern struct timezone sys_tz;
332 return t + sys_tz.tz_minuteswest * 60 + hpfs_sb(s)->sb_timeshift;
333}
334
335static inline time32_t gmt_to_local(struct super_block *s, time_t t)
336{
337 extern struct timezone sys_tz;
338 return t - sys_tz.tz_minuteswest * 60 - hpfs_sb(s)->sb_timeshift;
339}