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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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070015#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070016
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; /* (directories) gives fnode of parent dir */
47 unsigned i_dno; /* (directories) root dnode */
48 unsigned i_dpos; /* (directories) temp for readdir */
49 unsigned i_dsubdno; /* (directories) temp for readdir */
50 unsigned i_file_sec; /* (files) minimalist cache of alloc info */
51 unsigned i_disk_sec; /* (files) minimalist cache of alloc info */
52 unsigned i_n_secs; /* (files) minimalist cache of alloc info */
53 unsigned i_ea_size; /* size of extended attributes */
54 unsigned i_conv : 2; /* (files) crlf->newline hackery */
55 unsigned i_ea_mode : 1; /* file's permission is stored in ea */
56 unsigned i_ea_uid : 1; /* file's uid is stored in ea */
57 unsigned i_ea_gid : 1; /* file's gid is stored in ea */
58 unsigned i_dirty : 1;
Ingo Molnar7bf6d782006-03-23 03:00:42 -080059 struct mutex i_mutex;
60 struct mutex i_parent_mutex;
Linus Torvalds1da177e2005-04-16 15:20:36 -070061 loff_t **i_rddir_off;
62 struct inode vfs_inode;
63};
64
65struct hpfs_sb_info {
66 ino_t sb_root; /* inode number of root dir */
67 unsigned sb_fs_size; /* file system size, sectors */
68 unsigned sb_bitmaps; /* sector number of bitmap list */
69 unsigned sb_dirband_start; /* directory band start sector */
70 unsigned sb_dirband_size; /* directory band size, dnodes */
71 unsigned sb_dmap; /* sector number of dnode bit map */
72 unsigned sb_n_free; /* free blocks for statfs, or -1 */
73 unsigned sb_n_free_dnodes; /* free dnodes for statfs, or -1 */
74 uid_t sb_uid; /* uid from mount options */
75 gid_t sb_gid; /* gid from mount options */
76 umode_t sb_mode; /* mode from mount options */
77 unsigned sb_conv : 2; /* crlf->newline hackery */
78 unsigned sb_eas : 2; /* eas: 0-ignore, 1-ro, 2-rw */
79 unsigned sb_err : 2; /* on errs: 0-cont, 1-ro, 2-panic */
80 unsigned sb_chk : 2; /* checks: 0-no, 1-normal, 2-strict */
81 unsigned sb_lowercase : 1; /* downcase filenames hackery */
82 unsigned sb_was_error : 1; /* there was an error, set dirty flag */
83 unsigned sb_chkdsk : 2; /* chkdsk: 0-no, 1-on errs, 2-allways */
84 unsigned char *sb_cp_table; /* code page tables: */
85 /* 128 bytes uppercasing table & */
86 /* 128 bytes lowercasing table */
87 unsigned *sb_bmp_dir; /* main bitmap directory */
88 unsigned sb_c_bitmap; /* current bitmap */
89 unsigned sb_max_fwd_alloc; /* max forwad allocation */
90 struct semaphore hpfs_creation_de; /* when creating dirents, nobody else
91 can alloc blocks */
92 /*unsigned sb_mounting : 1;*/
93 int sb_timeshift;
94};
95
96/*
97 * conv= options
98 */
99
100#define CONV_BINARY 0 /* no conversion */
101#define CONV_TEXT 1 /* crlf->newline */
102#define CONV_AUTO 2 /* decide based on file contents */
103
104/* Four 512-byte buffers and the 2k block obtained by concatenating them */
105
106struct quad_buffer_head {
107 struct buffer_head *bh[4];
108 void *data;
109};
110
111/* The b-tree down pointer from a dir entry */
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/* The first dir entry in a dnode */
120
121static inline struct hpfs_dirent *dnode_first_de (struct dnode *dnode)
122{
123 return (void *) dnode->dirent;
124}
125
126/* The end+1 of the dir entries */
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/* The dir entry after dir entry de */
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 (/*b+i < 0x4000 &&*/ !((bmp[((b+i) & 0x3fff) >> 5] >> ((b+i) & 0x1f)) & 1))
196 return i + 1;
197 return 0;
198}
199
200/* alloc.c */
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/* anode.c */
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 *);
Al Viro7e7742e2010-01-31 17:09:29 -0500218int hpfs_ea_write(struct super_block *, secno, int, unsigned, unsigned, const char *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219void 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/* buffer.c */
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/* dentry.c */
235
236void hpfs_set_dentry_operations(struct dentry *);
237
238/* dir.c */
239
240struct dentry *hpfs_lookup(struct inode *, struct dentry *, struct nameidata *);
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -0800241extern const struct file_operations hpfs_dir_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242
243/* dnode.c */
244
245void hpfs_add_pos(struct inode *, loff_t *);
246void hpfs_del_pos(struct inode *, loff_t *);
Al Viro7e7742e2010-01-31 17:09:29 -0500247struct hpfs_dirent *hpfs_add_de(struct super_block *, struct dnode *,
248 const unsigned char *, unsigned, secno);
249int hpfs_add_dirent(struct inode *, const unsigned char *, unsigned,
250 struct hpfs_dirent *, int);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251int 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 *);
Al Viro7e7742e2010-01-31 17:09:29 -0500255struct hpfs_dirent *map_dirent(struct inode *, dnode_secno,
256 const unsigned char *, unsigned, dnode_secno *,
257 struct quad_buffer_head *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258void hpfs_remove_dtree(struct super_block *, dnode_secno);
259struct hpfs_dirent *map_fnode_dirent(struct super_block *, fnode_secno, struct fnode *, struct quad_buffer_head *);
260
261/* ea.c */
262
263void hpfs_ea_ext_remove(struct super_block *, secno, int, unsigned);
264int hpfs_read_ea(struct super_block *, struct fnode *, char *, char *, int);
265char *hpfs_get_ea(struct super_block *, struct fnode *, char *, int *);
Al Viro7e7742e2010-01-31 17:09:29 -0500266void hpfs_set_ea(struct inode *, struct fnode *, const char *,
267 const char *, int);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268
269/* file.c */
270
Christoph Hellwig7ea80852010-05-26 17:53:25 +0200271int hpfs_file_fsync(struct file *, int);
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -0800272extern const struct file_operations hpfs_file_ops;
Arjan van de Ven92e1d5b2007-02-12 00:55:39 -0800273extern const struct inode_operations hpfs_file_iops;
Christoph Hellwigf5e54d62006-06-28 04:26:44 -0700274extern const struct address_space_operations hpfs_aops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275
276/* inode.c */
277
278void hpfs_init_inode(struct inode *);
279void hpfs_read_inode(struct inode *);
280void hpfs_write_inode(struct inode *);
281void hpfs_write_inode_nolock(struct inode *);
Christoph Hellwigca30bc92008-08-11 00:27:59 +0200282int hpfs_setattr(struct dentry *, struct iattr *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283void hpfs_write_if_changed(struct inode *);
284void hpfs_delete_inode(struct inode *);
285
286/* map.c */
287
288unsigned *hpfs_map_dnode_bitmap(struct super_block *, struct quad_buffer_head *);
289unsigned *hpfs_map_bitmap(struct super_block *, unsigned, struct quad_buffer_head *, char *);
Al Viro7e7742e2010-01-31 17:09:29 -0500290unsigned char *hpfs_load_code_page(struct super_block *, secno);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291secno *hpfs_load_bitmap_directory(struct super_block *, secno bmp);
292struct fnode *hpfs_map_fnode(struct super_block *s, ino_t, struct buffer_head **);
293struct anode *hpfs_map_anode(struct super_block *s, anode_secno, struct buffer_head **);
294struct dnode *hpfs_map_dnode(struct super_block *s, dnode_secno, struct quad_buffer_head *);
295dnode_secno hpfs_fnode_dno(struct super_block *s, ino_t ino);
296
297/* name.c */
298
299unsigned char hpfs_upcase(unsigned char *, unsigned char);
Al Viro7e7742e2010-01-31 17:09:29 -0500300int hpfs_chk_name(const unsigned char *, unsigned *);
301unsigned char *hpfs_translate_name(struct super_block *, unsigned char *, unsigned, int, int);
302int hpfs_compare_names(struct super_block *, const unsigned char *, unsigned,
303 const unsigned char *, unsigned, int);
304int hpfs_is_name_long(const unsigned char *, unsigned);
305void hpfs_adjust_length(const unsigned char *, unsigned *);
306void hpfs_decide_conv(struct inode *, const unsigned char *, unsigned);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307
308/* namei.c */
309
Arjan van de Ven92e1d5b2007-02-12 00:55:39 -0800310extern const struct inode_operations hpfs_dir_iops;
Christoph Hellwigf5e54d62006-06-28 04:26:44 -0700311extern const struct address_space_operations hpfs_symlink_aops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312
313static inline struct hpfs_inode_info *hpfs_i(struct inode *inode)
314{
315 return list_entry(inode, struct hpfs_inode_info, vfs_inode);
316}
317
318static inline struct hpfs_sb_info *hpfs_sb(struct super_block *sb)
319{
320 return sb->s_fs_info;
321}
322
323/* super.c */
324
Alexey Dobriyan352d94d2006-12-06 20:37:04 -0800325void hpfs_error(struct super_block *, const char *, ...)
326 __attribute__((format (printf, 2, 3)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327int hpfs_stop_cycles(struct super_block *, int, int *, int *, char *);
328unsigned hpfs_count_one_bitmap(struct super_block *, secno);
329
330/*
331 * local time (HPFS) to GMT (Unix)
332 */
333
334static inline time_t local_to_gmt(struct super_block *s, time32_t t)
335{
336 extern struct timezone sys_tz;
337 return t + sys_tz.tz_minuteswest * 60 + hpfs_sb(s)->sb_timeshift;
338}
339
340static inline time32_t gmt_to_local(struct super_block *s, time_t t)
341{
342 extern struct timezone sys_tz;
343 return t - sys_tz.tz_minuteswest * 60 - hpfs_sb(s)->sb_timeshift;
344}