tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
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
12#include <linux/mutex.h>
13#include <linux/pagemap.h>
14#include <linux/buffer_head.h>
15#include <linux/slab.h>
16#include <asm/unaligned.h>
17
18#include "hpfs.h"
19
20#define EIOERROR EIO
21#define EFSERROR EPERM
22#define EMEMERROR ENOMEM
23
24#define ANODE_ALLOC_FWD 512
25#define FNODE_ALLOC_FWD 0
26#define ALLOC_FWD_MIN 16
27#define ALLOC_FWD_MAX 128
28#define ALLOC_M 1
29#define FNODE_RD_AHEAD 16
30#define ANODE_RD_AHEAD 0
31#define DNODE_RD_AHEAD 72
32#define COUNT_RD_AHEAD 62
33
34#define FREE_DNODES_ADD 58
35#define FREE_DNODES_DEL 29
36
37#define CHKCOND(x,y) if (!(x)) printk y
38
39struct hpfs_inode_info {
40 loff_t mmu_private;
41 ino_t i_parent_dir; /* (directories) gives fnode of parent dir */
42 unsigned i_dno; /* (directories) root dnode */
43 unsigned i_dpos; /* (directories) temp for readdir */
44 unsigned i_dsubdno; /* (directories) temp for readdir */
45 unsigned i_file_sec; /* (files) minimalist cache of alloc info */
46 unsigned i_disk_sec; /* (files) minimalist cache of alloc info */
47 unsigned i_n_secs; /* (files) minimalist cache of alloc info */
48 unsigned i_ea_size; /* size of extended attributes */
49 unsigned i_ea_mode : 1; /* file's permission is stored in ea */
50 unsigned i_ea_uid : 1; /* file's uid is stored in ea */
51 unsigned i_ea_gid : 1; /* file's gid is stored in ea */
52 unsigned i_dirty : 1;
53 loff_t **i_rddir_off;
54 struct inode vfs_inode;
55};
56
57struct hpfs_sb_info {
58 struct mutex hpfs_mutex; /* global hpfs lock */
59 ino_t sb_root; /* inode number of root dir */
60 unsigned sb_fs_size; /* file system size, sectors */
61 unsigned sb_bitmaps; /* sector number of bitmap list */
62 unsigned sb_dirband_start; /* directory band start sector */
63 unsigned sb_dirband_size; /* directory band size, dnodes */
64 unsigned sb_dmap; /* sector number of dnode bit map */
65 unsigned sb_n_free; /* free blocks for statfs, or -1 */
66 unsigned sb_n_free_dnodes; /* free dnodes for statfs, or -1 */
67 kuid_t sb_uid; /* uid from mount options */
68 kgid_t sb_gid; /* gid from mount options */
69 umode_t sb_mode; /* mode from mount options */
70 unsigned sb_eas : 2; /* eas: 0-ignore, 1-ro, 2-rw */
71 unsigned sb_err : 2; /* on errs: 0-cont, 1-ro, 2-panic */
72 unsigned sb_chk : 2; /* checks: 0-no, 1-normal, 2-strict */
73 unsigned sb_lowercase : 1; /* downcase filenames hackery */
74 unsigned sb_was_error : 1; /* there was an error, set dirty flag */
75 unsigned sb_chkdsk : 2; /* chkdsk: 0-no, 1-on errs, 2-allways */
76 unsigned char *sb_cp_table; /* code page tables: */
77 /* 128 bytes uppercasing table & */
78 /* 128 bytes lowercasing table */
79 __le32 *sb_bmp_dir; /* main bitmap directory */
80 unsigned sb_c_bitmap; /* current bitmap */
81 unsigned sb_max_fwd_alloc; /* max forwad allocation */
82 int sb_timeshift;
83};
84
85/* Four 512-byte buffers and the 2k block obtained by concatenating them */
86
87struct quad_buffer_head {
88 struct buffer_head *bh[4];
89 void *data;
90};
91
92/* The b-tree down pointer from a dir entry */
93
94static inline dnode_secno de_down_pointer (struct hpfs_dirent *de)
95{
96 CHKCOND(de->down,("HPFS: de_down_pointer: !de->down\n"));
97 return le32_to_cpu(*(__le32 *) ((void *) de + le16_to_cpu(de->length) - 4));
98}
99
100/* The first dir entry in a dnode */
101
102static inline struct hpfs_dirent *dnode_first_de (struct dnode *dnode)
103{
104 return (void *) dnode->dirent;
105}
106
107/* The end+1 of the dir entries */
108
109static inline struct hpfs_dirent *dnode_end_de (struct dnode *dnode)
110{
111 CHKCOND(le32_to_cpu(dnode->first_free)>=0x14 && le32_to_cpu(dnode->first_free)<=0xa00,("HPFS: dnode_end_de: dnode->first_free = %x\n",(unsigned)le32_to_cpu(dnode->first_free)));
112 return (void *) dnode + le32_to_cpu(dnode->first_free);
113}
114
115/* The dir entry after dir entry de */
116
117static inline struct hpfs_dirent *de_next_de (struct hpfs_dirent *de)
118{
119 CHKCOND(le16_to_cpu(de->length)>=0x20 && le16_to_cpu(de->length)<0x800,("HPFS: de_next_de: de->length = %x\n",(unsigned)le16_to_cpu(de->length)));
120 return (void *) de + le16_to_cpu(de->length);
121}
122
123static inline struct extended_attribute *fnode_ea(struct fnode *fnode)
124{
125 return (struct extended_attribute *)((char *)fnode + le16_to_cpu(fnode->ea_offs) + le16_to_cpu(fnode->acl_size_s));
126}
127
128static inline struct extended_attribute *fnode_end_ea(struct fnode *fnode)
129{
130 return (struct extended_attribute *)((char *)fnode + le16_to_cpu(fnode->ea_offs) + le16_to_cpu(fnode->acl_size_s) + le16_to_cpu(fnode->ea_size_s));
131}
132
133static unsigned ea_valuelen(struct extended_attribute *ea)
134{
135 return ea->valuelen_lo + 256 * ea->valuelen_hi;
136}
137
138static inline struct extended_attribute *next_ea(struct extended_attribute *ea)
139{
140 return (struct extended_attribute *)((char *)ea + 5 + ea->namelen + ea_valuelen(ea));
141}
142
143static inline secno ea_sec(struct extended_attribute *ea)
144{
145 return le32_to_cpu(get_unaligned((__le32 *)((char *)ea + 9 + ea->namelen)));
146}
147
148static inline secno ea_len(struct extended_attribute *ea)
149{
150 return le32_to_cpu(get_unaligned((__le32 *)((char *)ea + 5 + ea->namelen)));
151}
152
153static inline char *ea_data(struct extended_attribute *ea)
154{
155 return (char *)((char *)ea + 5 + ea->namelen);
156}
157
158static inline unsigned de_size(int namelen, secno down_ptr)
159{
160 return ((0x1f + namelen + 3) & ~3) + (down_ptr ? 4 : 0);
161}
162
163static inline void copy_de(struct hpfs_dirent *dst, struct hpfs_dirent *src)
164{
165 int a;
166 int n;
167 if (!dst || !src) return;
168 a = dst->down;
169 n = dst->not_8x3;
170 memcpy((char *)dst + 2, (char *)src + 2, 28);
171 dst->down = a;
172 dst->not_8x3 = n;
173}
174
175static inline unsigned tstbits(__le32 *bmp, unsigned b, unsigned n)
176{
177 int i;
178 if ((b >= 0x4000) || (b + n - 1 >= 0x4000)) return n;
179 if (!((le32_to_cpu(bmp[(b & 0x3fff) >> 5]) >> (b & 0x1f)) & 1)) return 1;
180 for (i = 1; i < n; i++)
181 if (!((le32_to_cpu(bmp[((b+i) & 0x3fff) >> 5]) >> ((b+i) & 0x1f)) & 1))
182 return i + 1;
183 return 0;
184}
185
186/* alloc.c */
187
188int hpfs_chk_sectors(struct super_block *, secno, int, char *);
189secno hpfs_alloc_sector(struct super_block *, secno, unsigned, int);
190int hpfs_alloc_if_possible(struct super_block *, secno);
191void hpfs_free_sectors(struct super_block *, secno, unsigned);
192int hpfs_check_free_dnodes(struct super_block *, int);
193void hpfs_free_dnode(struct super_block *, secno);
194struct dnode *hpfs_alloc_dnode(struct super_block *, secno, dnode_secno *, struct quad_buffer_head *);
195struct fnode *hpfs_alloc_fnode(struct super_block *, secno, fnode_secno *, struct buffer_head **);
196struct anode *hpfs_alloc_anode(struct super_block *, secno, anode_secno *, struct buffer_head **);
197
198/* anode.c */
199
200secno hpfs_bplus_lookup(struct super_block *, struct inode *, struct bplus_header *, unsigned, struct buffer_head *);
201secno hpfs_add_sector_to_btree(struct super_block *, secno, int, unsigned);
202void hpfs_remove_btree(struct super_block *, struct bplus_header *);
203int hpfs_ea_read(struct super_block *, secno, int, unsigned, unsigned, char *);
204int hpfs_ea_write(struct super_block *, secno, int, unsigned, unsigned, const char *);
205void hpfs_ea_remove(struct super_block *, secno, int, unsigned);
206void hpfs_truncate_btree(struct super_block *, secno, int, unsigned);
207void hpfs_remove_fnode(struct super_block *, fnode_secno fno);
208
209/* buffer.c */
210
211void hpfs_prefetch_sectors(struct super_block *, unsigned, int);
212void *hpfs_map_sector(struct super_block *, unsigned, struct buffer_head **, int);
213void *hpfs_get_sector(struct super_block *, unsigned, struct buffer_head **);
214void *hpfs_map_4sectors(struct super_block *, unsigned, struct quad_buffer_head *, int);
215void *hpfs_get_4sectors(struct super_block *, unsigned, struct quad_buffer_head *);
216void hpfs_brelse4(struct quad_buffer_head *);
217void hpfs_mark_4buffers_dirty(struct quad_buffer_head *);
218
219/* dentry.c */
220
221extern const struct dentry_operations hpfs_dentry_operations;
222
223/* dir.c */
224
225struct dentry *hpfs_lookup(struct inode *, struct dentry *, unsigned int);
226extern const struct file_operations hpfs_dir_ops;
227
228/* dnode.c */
229
230void hpfs_add_pos(struct inode *, loff_t *);
231void hpfs_del_pos(struct inode *, loff_t *);
232struct hpfs_dirent *hpfs_add_de(struct super_block *, struct dnode *,
233 const unsigned char *, unsigned, secno);
234int hpfs_add_dirent(struct inode *, const unsigned char *, unsigned,
235 struct hpfs_dirent *);
236int hpfs_remove_dirent(struct inode *, dnode_secno, struct hpfs_dirent *, struct quad_buffer_head *, int);
237void hpfs_count_dnodes(struct super_block *, dnode_secno, int *, int *, int *);
238dnode_secno hpfs_de_as_down_as_possible(struct super_block *, dnode_secno dno);
239struct hpfs_dirent *map_pos_dirent(struct inode *, loff_t *, struct quad_buffer_head *);
240struct hpfs_dirent *map_dirent(struct inode *, dnode_secno,
241 const unsigned char *, unsigned, dnode_secno *,
242 struct quad_buffer_head *);
243void hpfs_remove_dtree(struct super_block *, dnode_secno);
244struct hpfs_dirent *map_fnode_dirent(struct super_block *, fnode_secno, struct fnode *, struct quad_buffer_head *);
245
246/* ea.c */
247
248void hpfs_ea_ext_remove(struct super_block *, secno, int, unsigned);
249int hpfs_read_ea(struct super_block *, struct fnode *, char *, char *, int);
250char *hpfs_get_ea(struct super_block *, struct fnode *, char *, int *);
251void hpfs_set_ea(struct inode *, struct fnode *, const char *,
252 const char *, int);
253
254/* file.c */
255
256int hpfs_file_fsync(struct file *, loff_t, loff_t, int);
257void hpfs_truncate(struct inode *);
258extern const struct file_operations hpfs_file_ops;
259extern const struct inode_operations hpfs_file_iops;
260extern const struct address_space_operations hpfs_aops;
261
262/* inode.c */
263
264void hpfs_init_inode(struct inode *);
265void hpfs_read_inode(struct inode *);
266void hpfs_write_inode(struct inode *);
267void hpfs_write_inode_nolock(struct inode *);
268int hpfs_setattr(struct dentry *, struct iattr *);
269void hpfs_write_if_changed(struct inode *);
270void hpfs_evict_inode(struct inode *);
271
272/* map.c */
273
274__le32 *hpfs_map_dnode_bitmap(struct super_block *, struct quad_buffer_head *);
275__le32 *hpfs_map_bitmap(struct super_block *, unsigned, struct quad_buffer_head *, char *);
276void hpfs_prefetch_bitmap(struct super_block *, unsigned);
277unsigned char *hpfs_load_code_page(struct super_block *, secno);
278__le32 *hpfs_load_bitmap_directory(struct super_block *, secno bmp);
279struct fnode *hpfs_map_fnode(struct super_block *s, ino_t, struct buffer_head **);
280struct anode *hpfs_map_anode(struct super_block *s, anode_secno, struct buffer_head **);
281struct dnode *hpfs_map_dnode(struct super_block *s, dnode_secno, struct quad_buffer_head *);
282dnode_secno hpfs_fnode_dno(struct super_block *s, ino_t ino);
283
284/* name.c */
285
286unsigned char hpfs_upcase(unsigned char *, unsigned char);
287int hpfs_chk_name(const unsigned char *, unsigned *);
288unsigned char *hpfs_translate_name(struct super_block *, unsigned char *, unsigned, int, int);
289int hpfs_compare_names(struct super_block *, const unsigned char *, unsigned,
290 const unsigned char *, unsigned, int);
291int hpfs_is_name_long(const unsigned char *, unsigned);
292void hpfs_adjust_length(const unsigned char *, unsigned *);
293
294/* namei.c */
295
296extern const struct inode_operations hpfs_dir_iops;
297extern const struct address_space_operations hpfs_symlink_aops;
298
299static inline struct hpfs_inode_info *hpfs_i(struct inode *inode)
300{
301 return list_entry(inode, struct hpfs_inode_info, vfs_inode);
302}
303
304static inline struct hpfs_sb_info *hpfs_sb(struct super_block *sb)
305{
306 return sb->s_fs_info;
307}
308
309/* super.c */
310
311__printf(2, 3)
312void hpfs_error(struct super_block *, const char *, ...);
313int hpfs_stop_cycles(struct super_block *, int, int *, int *, char *);
314unsigned hpfs_count_one_bitmap(struct super_block *, secno);
315
316/*
317 * local time (HPFS) to GMT (Unix)
318 */
319
320static inline time_t local_to_gmt(struct super_block *s, time32_t t)
321{
322 extern struct timezone sys_tz;
323 return t + sys_tz.tz_minuteswest * 60 + hpfs_sb(s)->sb_timeshift;
324}
325
326static inline time32_t gmt_to_local(struct super_block *s, time_t t)
327{
328 extern struct timezone sys_tz;
329 return t - sys_tz.tz_minuteswest * 60 - hpfs_sb(s)->sb_timeshift;
330}
331
332/*
333 * Locking:
334 *
335 * hpfs_lock() locks the whole filesystem. It must be taken
336 * on any method called by the VFS.
337 *
338 * We don't do any per-file locking anymore, it is hard to
339 * review and HPFS is not performance-sensitive anyway.
340 */
341static inline void hpfs_lock(struct super_block *s)
342{
343 struct hpfs_sb_info *sbi = hpfs_sb(s);
344 mutex_lock(&sbi->hpfs_mutex);
345}
346
347static inline void hpfs_unlock(struct super_block *s)
348{
349 struct hpfs_sb_info *sbi = hpfs_sb(s);
350 mutex_unlock(&sbi->hpfs_mutex);
351}
352
353static inline void hpfs_lock_assert(struct super_block *s)
354{
355 struct hpfs_sb_info *sbi = hpfs_sb(s);
356 WARN_ON(!mutex_is_locked(&sbi->hpfs_mutex));
357}