blob: dd552f862c8f1c562a34768f970b6ddcb68b2336 [file] [log] [blame]
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>
Mikulas Patockad0969d12011-05-08 20:44:32 +020016#include <asm/unaligned.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070017
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 16
31#define DNODE_RD_AHEAD 4
32
33#define FREE_DNODES_ADD 58
34#define FREE_DNODES_DEL 29
35
36#define CHKCOND(x,y) if (!(x)) printk y
37
38#ifdef DBG
39#define PRINTK(x) printk x
40#else
41#undef PRINTK
42#define PRINTK(x)
43#endif
44
45struct hpfs_inode_info {
46 loff_t mmu_private;
47 ino_t i_parent_dir; /* (directories) gives fnode of parent dir */
48 unsigned i_dno; /* (directories) root dnode */
49 unsigned i_dpos; /* (directories) temp for readdir */
50 unsigned i_dsubdno; /* (directories) temp for readdir */
51 unsigned i_file_sec; /* (files) minimalist cache of alloc info */
52 unsigned i_disk_sec; /* (files) minimalist cache of alloc info */
53 unsigned i_n_secs; /* (files) minimalist cache of alloc info */
54 unsigned i_ea_size; /* size of extended attributes */
Linus Torvalds1da177e2005-04-16 15:20:36 -070055 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -070059 loff_t **i_rddir_off;
60 struct inode vfs_inode;
61};
62
63struct hpfs_sb_info {
Mikulas Patocka7dd29d82011-05-08 20:42:54 +020064 struct mutex hpfs_mutex; /* global hpfs lock */
Linus Torvalds1da177e2005-04-16 15:20:36 -070065 ino_t sb_root; /* inode number of root dir */
66 unsigned sb_fs_size; /* file system size, sectors */
67 unsigned sb_bitmaps; /* sector number of bitmap list */
68 unsigned sb_dirband_start; /* directory band start sector */
69 unsigned sb_dirband_size; /* directory band size, dnodes */
70 unsigned sb_dmap; /* sector number of dnode bit map */
71 unsigned sb_n_free; /* free blocks for statfs, or -1 */
72 unsigned sb_n_free_dnodes; /* free dnodes for statfs, or -1 */
73 uid_t sb_uid; /* uid from mount options */
74 gid_t sb_gid; /* gid from mount options */
75 umode_t sb_mode; /* mode from mount options */
Linus Torvalds1da177e2005-04-16 15:20:36 -070076 unsigned sb_eas : 2; /* eas: 0-ignore, 1-ro, 2-rw */
77 unsigned sb_err : 2; /* on errs: 0-cont, 1-ro, 2-panic */
78 unsigned sb_chk : 2; /* checks: 0-no, 1-normal, 2-strict */
79 unsigned sb_lowercase : 1; /* downcase filenames hackery */
80 unsigned sb_was_error : 1; /* there was an error, set dirty flag */
81 unsigned sb_chkdsk : 2; /* chkdsk: 0-no, 1-on errs, 2-allways */
82 unsigned char *sb_cp_table; /* code page tables: */
83 /* 128 bytes uppercasing table & */
84 /* 128 bytes lowercasing table */
85 unsigned *sb_bmp_dir; /* main bitmap directory */
86 unsigned sb_c_bitmap; /* current bitmap */
87 unsigned sb_max_fwd_alloc; /* max forwad allocation */
Linus Torvalds1da177e2005-04-16 15:20:36 -070088 int sb_timeshift;
89};
90
Linus Torvalds1da177e2005-04-16 15:20:36 -070091/* Four 512-byte buffers and the 2k block obtained by concatenating them */
92
93struct quad_buffer_head {
94 struct buffer_head *bh[4];
95 void *data;
96};
97
98/* The b-tree down pointer from a dir entry */
99
100static inline dnode_secno de_down_pointer (struct hpfs_dirent *de)
101{
102 CHKCOND(de->down,("HPFS: de_down_pointer: !de->down\n"));
Mikulas Patocka0b697602011-05-08 20:44:26 +0200103 return le32_to_cpu(*(dnode_secno *) ((void *) de + le16_to_cpu(de->length) - 4));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104}
105
106/* The first dir entry in a dnode */
107
108static inline struct hpfs_dirent *dnode_first_de (struct dnode *dnode)
109{
110 return (void *) dnode->dirent;
111}
112
113/* The end+1 of the dir entries */
114
115static inline struct hpfs_dirent *dnode_end_de (struct dnode *dnode)
116{
Mikulas Patocka0b697602011-05-08 20:44:26 +0200117 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)));
118 return (void *) dnode + le32_to_cpu(dnode->first_free);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119}
120
121/* The dir entry after dir entry de */
122
123static inline struct hpfs_dirent *de_next_de (struct hpfs_dirent *de)
124{
Mikulas Patocka0b697602011-05-08 20:44:26 +0200125 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)));
126 return (void *) de + le16_to_cpu(de->length);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127}
128
129static inline struct extended_attribute *fnode_ea(struct fnode *fnode)
130{
Mikulas Patocka0b697602011-05-08 20:44:26 +0200131 return (struct extended_attribute *)((char *)fnode + le16_to_cpu(fnode->ea_offs) + le16_to_cpu(fnode->acl_size_s));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132}
133
134static inline struct extended_attribute *fnode_end_ea(struct fnode *fnode)
135{
Mikulas Patocka0b697602011-05-08 20:44:26 +0200136 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));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137}
138
Mikulas Patockad0969d12011-05-08 20:44:32 +0200139static unsigned ea_valuelen(struct extended_attribute *ea)
140{
141 return ea->valuelen_lo + 256 * ea->valuelen_hi;
142}
143
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144static inline struct extended_attribute *next_ea(struct extended_attribute *ea)
145{
Mikulas Patockad0969d12011-05-08 20:44:32 +0200146 return (struct extended_attribute *)((char *)ea + 5 + ea->namelen + ea_valuelen(ea));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147}
148
149static inline secno ea_sec(struct extended_attribute *ea)
150{
Mikulas Patockad0969d12011-05-08 20:44:32 +0200151 return le32_to_cpu(get_unaligned((secno *)((char *)ea + 9 + ea->namelen)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152}
153
154static inline secno ea_len(struct extended_attribute *ea)
155{
Mikulas Patockad0969d12011-05-08 20:44:32 +0200156 return le32_to_cpu(get_unaligned((secno *)((char *)ea + 5 + ea->namelen)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157}
158
159static inline char *ea_data(struct extended_attribute *ea)
160{
161 return (char *)((char *)ea + 5 + ea->namelen);
162}
163
164static inline unsigned de_size(int namelen, secno down_ptr)
165{
166 return ((0x1f + namelen + 3) & ~3) + (down_ptr ? 4 : 0);
167}
168
169static inline void copy_de(struct hpfs_dirent *dst, struct hpfs_dirent *src)
170{
171 int a;
172 int n;
173 if (!dst || !src) return;
174 a = dst->down;
175 n = dst->not_8x3;
176 memcpy((char *)dst + 2, (char *)src + 2, 28);
177 dst->down = a;
178 dst->not_8x3 = n;
179}
180
Mikulas Patocka0b697602011-05-08 20:44:26 +0200181static inline unsigned tstbits(u32 *bmp, unsigned b, unsigned n)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182{
183 int i;
184 if ((b >= 0x4000) || (b + n - 1 >= 0x4000)) return n;
Mikulas Patocka0b697602011-05-08 20:44:26 +0200185 if (!((le32_to_cpu(bmp[(b & 0x3fff) >> 5]) >> (b & 0x1f)) & 1)) return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186 for (i = 1; i < n; i++)
Mikulas Patocka0b697602011-05-08 20:44:26 +0200187 if (!((le32_to_cpu(bmp[((b+i) & 0x3fff) >> 5]) >> ((b+i) & 0x1f)) & 1))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188 return i + 1;
189 return 0;
190}
191
192/* alloc.c */
193
194int hpfs_chk_sectors(struct super_block *, secno, int, char *);
Mikulas Patocka7d23ce32011-05-08 20:43:06 +0200195secno hpfs_alloc_sector(struct super_block *, secno, unsigned, int);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196int hpfs_alloc_if_possible(struct super_block *, secno);
197void hpfs_free_sectors(struct super_block *, secno, unsigned);
198int hpfs_check_free_dnodes(struct super_block *, int);
199void hpfs_free_dnode(struct super_block *, secno);
Mikulas Patocka7d23ce32011-05-08 20:43:06 +0200200struct dnode *hpfs_alloc_dnode(struct super_block *, secno, dnode_secno *, struct quad_buffer_head *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201struct fnode *hpfs_alloc_fnode(struct super_block *, secno, fnode_secno *, struct buffer_head **);
202struct anode *hpfs_alloc_anode(struct super_block *, secno, anode_secno *, struct buffer_head **);
203
204/* anode.c */
205
206secno hpfs_bplus_lookup(struct super_block *, struct inode *, struct bplus_header *, unsigned, struct buffer_head *);
207secno hpfs_add_sector_to_btree(struct super_block *, secno, int, unsigned);
208void hpfs_remove_btree(struct super_block *, struct bplus_header *);
209int hpfs_ea_read(struct super_block *, secno, int, unsigned, unsigned, char *);
Al Viro7e7742e2010-01-31 17:09:29 -0500210int hpfs_ea_write(struct super_block *, secno, int, unsigned, unsigned, const char *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211void hpfs_ea_remove(struct super_block *, secno, int, unsigned);
212void hpfs_truncate_btree(struct super_block *, secno, int, unsigned);
213void hpfs_remove_fnode(struct super_block *, fnode_secno fno);
214
215/* buffer.c */
216
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217void *hpfs_map_sector(struct super_block *, unsigned, struct buffer_head **, int);
218void *hpfs_get_sector(struct super_block *, unsigned, struct buffer_head **);
219void *hpfs_map_4sectors(struct super_block *, unsigned, struct quad_buffer_head *, int);
220void *hpfs_get_4sectors(struct super_block *, unsigned, struct quad_buffer_head *);
221void hpfs_brelse4(struct quad_buffer_head *);
222void hpfs_mark_4buffers_dirty(struct quad_buffer_head *);
223
224/* dentry.c */
225
Al Viro43d344d2011-01-12 16:12:05 -0500226extern const struct dentry_operations hpfs_dentry_operations;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227
228/* dir.c */
229
230struct dentry *hpfs_lookup(struct inode *, struct dentry *, struct nameidata *);
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -0800231extern const struct file_operations hpfs_dir_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232
233/* dnode.c */
234
235void hpfs_add_pos(struct inode *, loff_t *);
236void hpfs_del_pos(struct inode *, loff_t *);
Al Viro7e7742e2010-01-31 17:09:29 -0500237struct hpfs_dirent *hpfs_add_de(struct super_block *, struct dnode *,
238 const unsigned char *, unsigned, secno);
239int hpfs_add_dirent(struct inode *, const unsigned char *, unsigned,
Mikulas Patocka7d23ce32011-05-08 20:43:06 +0200240 struct hpfs_dirent *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241int hpfs_remove_dirent(struct inode *, dnode_secno, struct hpfs_dirent *, struct quad_buffer_head *, int);
242void hpfs_count_dnodes(struct super_block *, dnode_secno, int *, int *, int *);
243dnode_secno hpfs_de_as_down_as_possible(struct super_block *, dnode_secno dno);
244struct hpfs_dirent *map_pos_dirent(struct inode *, loff_t *, struct quad_buffer_head *);
Al Viro7e7742e2010-01-31 17:09:29 -0500245struct hpfs_dirent *map_dirent(struct inode *, dnode_secno,
246 const unsigned char *, unsigned, dnode_secno *,
247 struct quad_buffer_head *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248void hpfs_remove_dtree(struct super_block *, dnode_secno);
249struct hpfs_dirent *map_fnode_dirent(struct super_block *, fnode_secno, struct fnode *, struct quad_buffer_head *);
250
251/* ea.c */
252
253void hpfs_ea_ext_remove(struct super_block *, secno, int, unsigned);
254int hpfs_read_ea(struct super_block *, struct fnode *, char *, char *, int);
255char *hpfs_get_ea(struct super_block *, struct fnode *, char *, int *);
Al Viro7e7742e2010-01-31 17:09:29 -0500256void hpfs_set_ea(struct inode *, struct fnode *, const char *,
257 const char *, int);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258
259/* file.c */
260
Christoph Hellwig7ea80852010-05-26 17:53:25 +0200261int hpfs_file_fsync(struct file *, int);
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -0800262extern const struct file_operations hpfs_file_ops;
Arjan van de Ven92e1d5b2007-02-12 00:55:39 -0800263extern const struct inode_operations hpfs_file_iops;
Christoph Hellwigf5e54d62006-06-28 04:26:44 -0700264extern const struct address_space_operations hpfs_aops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265
266/* inode.c */
267
268void hpfs_init_inode(struct inode *);
269void hpfs_read_inode(struct inode *);
270void hpfs_write_inode(struct inode *);
271void hpfs_write_inode_nolock(struct inode *);
Christoph Hellwigca30bc92008-08-11 00:27:59 +0200272int hpfs_setattr(struct dentry *, struct iattr *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273void hpfs_write_if_changed(struct inode *);
Al Viroea544002010-06-07 00:18:40 -0400274void hpfs_evict_inode(struct inode *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275
276/* map.c */
277
278unsigned *hpfs_map_dnode_bitmap(struct super_block *, struct quad_buffer_head *);
279unsigned *hpfs_map_bitmap(struct super_block *, unsigned, struct quad_buffer_head *, char *);
Al Viro7e7742e2010-01-31 17:09:29 -0500280unsigned char *hpfs_load_code_page(struct super_block *, secno);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281secno *hpfs_load_bitmap_directory(struct super_block *, secno bmp);
282struct fnode *hpfs_map_fnode(struct super_block *s, ino_t, struct buffer_head **);
283struct anode *hpfs_map_anode(struct super_block *s, anode_secno, struct buffer_head **);
284struct dnode *hpfs_map_dnode(struct super_block *s, dnode_secno, struct quad_buffer_head *);
285dnode_secno hpfs_fnode_dno(struct super_block *s, ino_t ino);
286
287/* name.c */
288
289unsigned char hpfs_upcase(unsigned char *, unsigned char);
Al Viro7e7742e2010-01-31 17:09:29 -0500290int hpfs_chk_name(const unsigned char *, unsigned *);
291unsigned char *hpfs_translate_name(struct super_block *, unsigned char *, unsigned, int, int);
292int hpfs_compare_names(struct super_block *, const unsigned char *, unsigned,
293 const unsigned char *, unsigned, int);
294int hpfs_is_name_long(const unsigned char *, unsigned);
295void hpfs_adjust_length(const unsigned char *, unsigned *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296
297/* namei.c */
298
Arjan van de Ven92e1d5b2007-02-12 00:55:39 -0800299extern const struct inode_operations hpfs_dir_iops;
Christoph Hellwigf5e54d62006-06-28 04:26:44 -0700300extern const struct address_space_operations hpfs_symlink_aops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301
302static inline struct hpfs_inode_info *hpfs_i(struct inode *inode)
303{
304 return list_entry(inode, struct hpfs_inode_info, vfs_inode);
305}
306
307static inline struct hpfs_sb_info *hpfs_sb(struct super_block *sb)
308{
309 return sb->s_fs_info;
310}
311
312/* super.c */
313
Alexey Dobriyan352d94d2006-12-06 20:37:04 -0800314void hpfs_error(struct super_block *, const char *, ...)
315 __attribute__((format (printf, 2, 3)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316int hpfs_stop_cycles(struct super_block *, int, int *, int *, char *);
317unsigned hpfs_count_one_bitmap(struct super_block *, secno);
318
319/*
320 * local time (HPFS) to GMT (Unix)
321 */
322
323static inline time_t local_to_gmt(struct super_block *s, time32_t t)
324{
325 extern struct timezone sys_tz;
326 return t + sys_tz.tz_minuteswest * 60 + hpfs_sb(s)->sb_timeshift;
327}
328
329static inline time32_t gmt_to_local(struct super_block *s, time_t t)
330{
331 extern struct timezone sys_tz;
332 return t - sys_tz.tz_minuteswest * 60 - hpfs_sb(s)->sb_timeshift;
333}
Arnd Bergmann9a311b92011-01-22 20:26:12 +0100334
335/*
336 * Locking:
337 *
Mikulas Patocka7dd29d82011-05-08 20:42:54 +0200338 * hpfs_lock() locks the whole filesystem. It must be taken
339 * on any method called by the VFS.
Arnd Bergmann9a311b92011-01-22 20:26:12 +0100340 *
Mikulas Patocka7dd29d82011-05-08 20:42:54 +0200341 * We don't do any per-file locking anymore, it is hard to
342 * review and HPFS is not performance-sensitive anyway.
Arnd Bergmann9a311b92011-01-22 20:26:12 +0100343 */
344static inline void hpfs_lock(struct super_block *s)
345{
Mikulas Patocka7dd29d82011-05-08 20:42:54 +0200346 struct hpfs_sb_info *sbi = hpfs_sb(s);
347 mutex_lock(&sbi->hpfs_mutex);
Arnd Bergmann9a311b92011-01-22 20:26:12 +0100348}
349
350static inline void hpfs_unlock(struct super_block *s)
351{
Mikulas Patocka7dd29d82011-05-08 20:42:54 +0200352 struct hpfs_sb_info *sbi = hpfs_sb(s);
353 mutex_unlock(&sbi->hpfs_mutex);
354}
355
356static inline void hpfs_lock_assert(struct super_block *s)
357{
358 struct hpfs_sb_info *sbi = hpfs_sb(s);
359 WARN_ON(!mutex_is_locked(&sbi->hpfs_mutex));
Arnd Bergmann9a311b92011-01-22 20:26:12 +0100360}