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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>
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
Linus Torvalds1da177e2005-04-16 15:20:36 -070038struct hpfs_inode_info {
39 loff_t mmu_private;
40 ino_t i_parent_dir; /* (directories) gives fnode of parent dir */
41 unsigned i_dno; /* (directories) root dnode */
42 unsigned i_dpos; /* (directories) temp for readdir */
43 unsigned i_dsubdno; /* (directories) temp for readdir */
44 unsigned i_file_sec; /* (files) minimalist cache of alloc info */
45 unsigned i_disk_sec; /* (files) minimalist cache of alloc info */
46 unsigned i_n_secs; /* (files) minimalist cache of alloc info */
47 unsigned i_ea_size; /* size of extended attributes */
Linus Torvalds1da177e2005-04-16 15:20:36 -070048 unsigned i_ea_mode : 1; /* file's permission is stored in ea */
49 unsigned i_ea_uid : 1; /* file's uid is stored in ea */
50 unsigned i_ea_gid : 1; /* file's gid is stored in ea */
51 unsigned i_dirty : 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -070052 loff_t **i_rddir_off;
53 struct inode vfs_inode;
54};
55
56struct hpfs_sb_info {
Mikulas Patocka7dd29d82011-05-08 20:42:54 +020057 struct mutex hpfs_mutex; /* global hpfs lock */
Linus Torvalds1da177e2005-04-16 15:20:36 -070058 ino_t sb_root; /* inode number of root dir */
59 unsigned sb_fs_size; /* file system size, sectors */
60 unsigned sb_bitmaps; /* sector number of bitmap list */
61 unsigned sb_dirband_start; /* directory band start sector */
62 unsigned sb_dirband_size; /* directory band size, dnodes */
63 unsigned sb_dmap; /* sector number of dnode bit map */
64 unsigned sb_n_free; /* free blocks for statfs, or -1 */
65 unsigned sb_n_free_dnodes; /* free dnodes for statfs, or -1 */
66 uid_t sb_uid; /* uid from mount options */
67 gid_t sb_gid; /* gid from mount options */
68 umode_t sb_mode; /* mode from mount options */
Linus Torvalds1da177e2005-04-16 15:20:36 -070069 unsigned sb_eas : 2; /* eas: 0-ignore, 1-ro, 2-rw */
70 unsigned sb_err : 2; /* on errs: 0-cont, 1-ro, 2-panic */
71 unsigned sb_chk : 2; /* checks: 0-no, 1-normal, 2-strict */
72 unsigned sb_lowercase : 1; /* downcase filenames hackery */
73 unsigned sb_was_error : 1; /* there was an error, set dirty flag */
74 unsigned sb_chkdsk : 2; /* chkdsk: 0-no, 1-on errs, 2-allways */
75 unsigned char *sb_cp_table; /* code page tables: */
76 /* 128 bytes uppercasing table & */
77 /* 128 bytes lowercasing table */
Al Viro28fe3c12012-04-17 16:41:13 -040078 __le32 *sb_bmp_dir; /* main bitmap directory */
Linus Torvalds1da177e2005-04-16 15:20:36 -070079 unsigned sb_c_bitmap; /* current bitmap */
80 unsigned sb_max_fwd_alloc; /* max forwad allocation */
Linus Torvalds1da177e2005-04-16 15:20:36 -070081 int sb_timeshift;
82};
83
Linus Torvalds1da177e2005-04-16 15:20:36 -070084/* Four 512-byte buffers and the 2k block obtained by concatenating them */
85
86struct quad_buffer_head {
87 struct buffer_head *bh[4];
88 void *data;
89};
90
91/* The b-tree down pointer from a dir entry */
92
93static inline dnode_secno de_down_pointer (struct hpfs_dirent *de)
94{
95 CHKCOND(de->down,("HPFS: de_down_pointer: !de->down\n"));
Al Viro46287aa2012-04-17 16:20:49 -040096 return le32_to_cpu(*(__le32 *) ((void *) de + le16_to_cpu(de->length) - 4));
Linus Torvalds1da177e2005-04-16 15:20:36 -070097}
98
99/* The first dir entry in a dnode */
100
101static inline struct hpfs_dirent *dnode_first_de (struct dnode *dnode)
102{
103 return (void *) dnode->dirent;
104}
105
106/* The end+1 of the dir entries */
107
108static inline struct hpfs_dirent *dnode_end_de (struct dnode *dnode)
109{
Mikulas Patocka0b697602011-05-08 20:44:26 +0200110 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)));
111 return (void *) dnode + le32_to_cpu(dnode->first_free);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112}
113
114/* The dir entry after dir entry de */
115
116static inline struct hpfs_dirent *de_next_de (struct hpfs_dirent *de)
117{
Mikulas Patocka0b697602011-05-08 20:44:26 +0200118 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)));
119 return (void *) de + le16_to_cpu(de->length);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120}
121
122static inline struct extended_attribute *fnode_ea(struct fnode *fnode)
123{
Mikulas Patocka0b697602011-05-08 20:44:26 +0200124 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 -0700125}
126
127static inline struct extended_attribute *fnode_end_ea(struct fnode *fnode)
128{
Mikulas Patocka0b697602011-05-08 20:44:26 +0200129 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 -0700130}
131
Mikulas Patockad0969d12011-05-08 20:44:32 +0200132static unsigned ea_valuelen(struct extended_attribute *ea)
133{
134 return ea->valuelen_lo + 256 * ea->valuelen_hi;
135}
136
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137static inline struct extended_attribute *next_ea(struct extended_attribute *ea)
138{
Mikulas Patockad0969d12011-05-08 20:44:32 +0200139 return (struct extended_attribute *)((char *)ea + 5 + ea->namelen + ea_valuelen(ea));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140}
141
142static inline secno ea_sec(struct extended_attribute *ea)
143{
Al Viro77ee26e42012-04-17 16:26:46 -0400144 return le32_to_cpu(get_unaligned((__le32 *)((char *)ea + 9 + ea->namelen)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145}
146
147static inline secno ea_len(struct extended_attribute *ea)
148{
Al Viro77ee26e42012-04-17 16:26:46 -0400149 return le32_to_cpu(get_unaligned((__le32 *)((char *)ea + 5 + ea->namelen)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150}
151
152static inline char *ea_data(struct extended_attribute *ea)
153{
154 return (char *)((char *)ea + 5 + ea->namelen);
155}
156
157static inline unsigned de_size(int namelen, secno down_ptr)
158{
159 return ((0x1f + namelen + 3) & ~3) + (down_ptr ? 4 : 0);
160}
161
162static inline void copy_de(struct hpfs_dirent *dst, struct hpfs_dirent *src)
163{
164 int a;
165 int n;
166 if (!dst || !src) return;
167 a = dst->down;
168 n = dst->not_8x3;
169 memcpy((char *)dst + 2, (char *)src + 2, 28);
170 dst->down = a;
171 dst->not_8x3 = n;
172}
173
Al Viro52576da2012-04-17 15:28:51 -0400174static inline unsigned tstbits(__le32 *bmp, unsigned b, unsigned n)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175{
176 int i;
177 if ((b >= 0x4000) || (b + n - 1 >= 0x4000)) return n;
Mikulas Patocka0b697602011-05-08 20:44:26 +0200178 if (!((le32_to_cpu(bmp[(b & 0x3fff) >> 5]) >> (b & 0x1f)) & 1)) return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179 for (i = 1; i < n; i++)
Mikulas Patocka0b697602011-05-08 20:44:26 +0200180 if (!((le32_to_cpu(bmp[((b+i) & 0x3fff) >> 5]) >> ((b+i) & 0x1f)) & 1))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181 return i + 1;
182 return 0;
183}
184
185/* alloc.c */
186
187int hpfs_chk_sectors(struct super_block *, secno, int, char *);
Mikulas Patocka7d23ce32011-05-08 20:43:06 +0200188secno hpfs_alloc_sector(struct super_block *, secno, unsigned, int);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189int hpfs_alloc_if_possible(struct super_block *, secno);
190void hpfs_free_sectors(struct super_block *, secno, unsigned);
191int hpfs_check_free_dnodes(struct super_block *, int);
192void hpfs_free_dnode(struct super_block *, secno);
Mikulas Patocka7d23ce32011-05-08 20:43:06 +0200193struct dnode *hpfs_alloc_dnode(struct super_block *, secno, dnode_secno *, struct quad_buffer_head *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194struct fnode *hpfs_alloc_fnode(struct super_block *, secno, fnode_secno *, struct buffer_head **);
195struct anode *hpfs_alloc_anode(struct super_block *, secno, anode_secno *, struct buffer_head **);
196
197/* anode.c */
198
199secno hpfs_bplus_lookup(struct super_block *, struct inode *, struct bplus_header *, unsigned, struct buffer_head *);
200secno hpfs_add_sector_to_btree(struct super_block *, secno, int, unsigned);
201void hpfs_remove_btree(struct super_block *, struct bplus_header *);
202int hpfs_ea_read(struct super_block *, secno, int, unsigned, unsigned, char *);
Al Viro7e7742e2010-01-31 17:09:29 -0500203int hpfs_ea_write(struct super_block *, secno, int, unsigned, unsigned, const char *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204void hpfs_ea_remove(struct super_block *, secno, int, unsigned);
205void hpfs_truncate_btree(struct super_block *, secno, int, unsigned);
206void hpfs_remove_fnode(struct super_block *, fnode_secno fno);
207
208/* buffer.c */
209
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210void *hpfs_map_sector(struct super_block *, unsigned, struct buffer_head **, int);
211void *hpfs_get_sector(struct super_block *, unsigned, struct buffer_head **);
212void *hpfs_map_4sectors(struct super_block *, unsigned, struct quad_buffer_head *, int);
213void *hpfs_get_4sectors(struct super_block *, unsigned, struct quad_buffer_head *);
214void hpfs_brelse4(struct quad_buffer_head *);
215void hpfs_mark_4buffers_dirty(struct quad_buffer_head *);
216
217/* dentry.c */
218
Al Viro43d344d2011-01-12 16:12:05 -0500219extern const struct dentry_operations hpfs_dentry_operations;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220
221/* dir.c */
222
Al Viro00cd8dd2012-06-10 17:13:09 -0400223struct dentry *hpfs_lookup(struct inode *, struct dentry *, unsigned int);
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -0800224extern const struct file_operations hpfs_dir_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225
226/* dnode.c */
227
228void hpfs_add_pos(struct inode *, loff_t *);
229void hpfs_del_pos(struct inode *, loff_t *);
Al Viro7e7742e2010-01-31 17:09:29 -0500230struct hpfs_dirent *hpfs_add_de(struct super_block *, struct dnode *,
231 const unsigned char *, unsigned, secno);
232int hpfs_add_dirent(struct inode *, const unsigned char *, unsigned,
Mikulas Patocka7d23ce32011-05-08 20:43:06 +0200233 struct hpfs_dirent *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234int hpfs_remove_dirent(struct inode *, dnode_secno, struct hpfs_dirent *, struct quad_buffer_head *, int);
235void hpfs_count_dnodes(struct super_block *, dnode_secno, int *, int *, int *);
236dnode_secno hpfs_de_as_down_as_possible(struct super_block *, dnode_secno dno);
237struct hpfs_dirent *map_pos_dirent(struct inode *, loff_t *, struct quad_buffer_head *);
Al Viro7e7742e2010-01-31 17:09:29 -0500238struct hpfs_dirent *map_dirent(struct inode *, dnode_secno,
239 const unsigned char *, unsigned, dnode_secno *,
240 struct quad_buffer_head *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241void hpfs_remove_dtree(struct super_block *, dnode_secno);
242struct hpfs_dirent *map_fnode_dirent(struct super_block *, fnode_secno, struct fnode *, struct quad_buffer_head *);
243
244/* ea.c */
245
246void hpfs_ea_ext_remove(struct super_block *, secno, int, unsigned);
247int hpfs_read_ea(struct super_block *, struct fnode *, char *, char *, int);
248char *hpfs_get_ea(struct super_block *, struct fnode *, char *, int *);
Al Viro7e7742e2010-01-31 17:09:29 -0500249void hpfs_set_ea(struct inode *, struct fnode *, const char *,
250 const char *, int);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251
252/* file.c */
253
Josef Bacik02c24a82011-07-16 20:44:56 -0400254int hpfs_file_fsync(struct file *, loff_t, loff_t, int);
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -0800255extern const struct file_operations hpfs_file_ops;
Arjan van de Ven92e1d5b2007-02-12 00:55:39 -0800256extern const struct inode_operations hpfs_file_iops;
Christoph Hellwigf5e54d62006-06-28 04:26:44 -0700257extern const struct address_space_operations hpfs_aops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258
259/* inode.c */
260
261void hpfs_init_inode(struct inode *);
262void hpfs_read_inode(struct inode *);
263void hpfs_write_inode(struct inode *);
264void hpfs_write_inode_nolock(struct inode *);
Christoph Hellwigca30bc92008-08-11 00:27:59 +0200265int hpfs_setattr(struct dentry *, struct iattr *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266void hpfs_write_if_changed(struct inode *);
Al Viroea544002010-06-07 00:18:40 -0400267void hpfs_evict_inode(struct inode *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268
269/* map.c */
270
Al Viro52576da2012-04-17 15:28:51 -0400271__le32 *hpfs_map_dnode_bitmap(struct super_block *, struct quad_buffer_head *);
272__le32 *hpfs_map_bitmap(struct super_block *, unsigned, struct quad_buffer_head *, char *);
Al Viro7e7742e2010-01-31 17:09:29 -0500273unsigned char *hpfs_load_code_page(struct super_block *, secno);
Al Viro28fe3c12012-04-17 16:41:13 -0400274__le32 *hpfs_load_bitmap_directory(struct super_block *, secno bmp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275struct fnode *hpfs_map_fnode(struct super_block *s, ino_t, struct buffer_head **);
276struct anode *hpfs_map_anode(struct super_block *s, anode_secno, struct buffer_head **);
277struct dnode *hpfs_map_dnode(struct super_block *s, dnode_secno, struct quad_buffer_head *);
278dnode_secno hpfs_fnode_dno(struct super_block *s, ino_t ino);
279
280/* name.c */
281
282unsigned char hpfs_upcase(unsigned char *, unsigned char);
Al Viro7e7742e2010-01-31 17:09:29 -0500283int hpfs_chk_name(const unsigned char *, unsigned *);
284unsigned char *hpfs_translate_name(struct super_block *, unsigned char *, unsigned, int, int);
285int hpfs_compare_names(struct super_block *, const unsigned char *, unsigned,
286 const unsigned char *, unsigned, int);
287int hpfs_is_name_long(const unsigned char *, unsigned);
288void hpfs_adjust_length(const unsigned char *, unsigned *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289
290/* namei.c */
291
Arjan van de Ven92e1d5b2007-02-12 00:55:39 -0800292extern const struct inode_operations hpfs_dir_iops;
Christoph Hellwigf5e54d62006-06-28 04:26:44 -0700293extern const struct address_space_operations hpfs_symlink_aops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294
295static inline struct hpfs_inode_info *hpfs_i(struct inode *inode)
296{
297 return list_entry(inode, struct hpfs_inode_info, vfs_inode);
298}
299
300static inline struct hpfs_sb_info *hpfs_sb(struct super_block *sb)
301{
302 return sb->s_fs_info;
303}
304
305/* super.c */
306
Joe Perchesb9075fa2011-10-31 17:11:33 -0700307__printf(2, 3)
308void hpfs_error(struct super_block *, const char *, ...);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309int hpfs_stop_cycles(struct super_block *, int, int *, int *, char *);
310unsigned hpfs_count_one_bitmap(struct super_block *, secno);
311
312/*
313 * local time (HPFS) to GMT (Unix)
314 */
315
316static inline time_t local_to_gmt(struct super_block *s, time32_t t)
317{
318 extern struct timezone sys_tz;
319 return t + sys_tz.tz_minuteswest * 60 + hpfs_sb(s)->sb_timeshift;
320}
321
322static inline time32_t gmt_to_local(struct super_block *s, time_t t)
323{
324 extern struct timezone sys_tz;
325 return t - sys_tz.tz_minuteswest * 60 - hpfs_sb(s)->sb_timeshift;
326}
Arnd Bergmann9a311b92011-01-22 20:26:12 +0100327
328/*
329 * Locking:
330 *
Mikulas Patocka7dd29d82011-05-08 20:42:54 +0200331 * hpfs_lock() locks the whole filesystem. It must be taken
332 * on any method called by the VFS.
Arnd Bergmann9a311b92011-01-22 20:26:12 +0100333 *
Mikulas Patocka7dd29d82011-05-08 20:42:54 +0200334 * We don't do any per-file locking anymore, it is hard to
335 * review and HPFS is not performance-sensitive anyway.
Arnd Bergmann9a311b92011-01-22 20:26:12 +0100336 */
337static inline void hpfs_lock(struct super_block *s)
338{
Mikulas Patocka7dd29d82011-05-08 20:42:54 +0200339 struct hpfs_sb_info *sbi = hpfs_sb(s);
340 mutex_lock(&sbi->hpfs_mutex);
Arnd Bergmann9a311b92011-01-22 20:26:12 +0100341}
342
343static inline void hpfs_unlock(struct super_block *s)
344{
Mikulas Patocka7dd29d82011-05-08 20:42:54 +0200345 struct hpfs_sb_info *sbi = hpfs_sb(s);
346 mutex_unlock(&sbi->hpfs_mutex);
347}
348
349static inline void hpfs_lock_assert(struct super_block *s)
350{
351 struct hpfs_sb_info *sbi = hpfs_sb(s);
352 WARN_ON(!mutex_is_locked(&sbi->hpfs_mutex));
Arnd Bergmann9a311b92011-01-22 20:26:12 +0100353}