blob: aebb78f9e47f2ac27bde015a9ba135a1a25d2faf [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
Fabian Frederick14da17f2014-06-06 14:36:34 -070011#ifdef pr_fmt
12#undef pr_fmt
13#endif
14
15#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
Linus Torvalds1da177e2005-04-16 15:20:36 -070016
Ingo Molnar7bf6d782006-03-23 03:00:42 -080017#include <linux/mutex.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070018#include <linux/pagemap.h>
19#include <linux/buffer_head.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070020#include <linux/slab.h>
Mikulas Patockaa27b5b92015-06-28 15:16:57 +020021#include <linux/sched.h>
22#include <linux/blkdev.h>
Mikulas Patockad0969d12011-05-08 20:44:32 +020023#include <asm/unaligned.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070024
25#include "hpfs.h"
26
27#define EIOERROR EIO
28#define EFSERROR EPERM
29#define EMEMERROR ENOMEM
30
31#define ANODE_ALLOC_FWD 512
32#define FNODE_ALLOC_FWD 0
33#define ALLOC_FWD_MIN 16
34#define ALLOC_FWD_MAX 128
35#define ALLOC_M 1
36#define FNODE_RD_AHEAD 16
Mikulas Patocka275f4952013-07-04 19:04:01 +020037#define ANODE_RD_AHEAD 0
38#define DNODE_RD_AHEAD 72
39#define COUNT_RD_AHEAD 62
Linus Torvalds1da177e2005-04-16 15:20:36 -070040
41#define FREE_DNODES_ADD 58
42#define FREE_DNODES_DEL 29
43
44#define CHKCOND(x,y) if (!(x)) printk y
45
Linus Torvalds1da177e2005-04-16 15:20:36 -070046struct 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 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070056 unsigned i_ea_mode : 1; /* file's permission is stored in ea */
57 unsigned i_ea_uid : 1; /* file's uid is stored in ea */
58 unsigned i_ea_gid : 1; /* file's gid is stored in ea */
59 unsigned i_dirty : 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -070060 loff_t **i_rddir_off;
61 struct inode vfs_inode;
62};
63
64struct hpfs_sb_info {
Mikulas Patocka7dd29d82011-05-08 20:42:54 +020065 struct mutex hpfs_mutex; /* global hpfs lock */
Linus Torvalds1da177e2005-04-16 15:20:36 -070066 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 */
Eric W. Biederman0e1a43c2012-02-07 16:27:53 -080074 kuid_t sb_uid; /* uid from mount options */
75 kgid_t sb_gid; /* gid from mount options */
Linus Torvalds1da177e2005-04-16 15:20:36 -070076 umode_t sb_mode; /* mode from mount options */
Linus Torvalds1da177e2005-04-16 15:20:36 -070077 unsigned sb_eas : 2; /* eas: 0-ignore, 1-ro, 2-rw */
78 unsigned sb_err : 2; /* on errs: 0-cont, 1-ro, 2-panic */
79 unsigned sb_chk : 2; /* checks: 0-no, 1-normal, 2-strict */
80 unsigned sb_lowercase : 1; /* downcase filenames hackery */
81 unsigned sb_was_error : 1; /* there was an error, set dirty flag */
82 unsigned sb_chkdsk : 2; /* chkdsk: 0-no, 1-on errs, 2-allways */
83 unsigned char *sb_cp_table; /* code page tables: */
84 /* 128 bytes uppercasing table & */
85 /* 128 bytes lowercasing table */
Al Viro28fe3c12012-04-17 16:41:13 -040086 __le32 *sb_bmp_dir; /* main bitmap directory */
Linus Torvalds1da177e2005-04-16 15:20:36 -070087 unsigned sb_c_bitmap; /* current bitmap */
88 unsigned sb_max_fwd_alloc; /* max forwad allocation */
Linus Torvalds1da177e2005-04-16 15:20:36 -070089 int sb_timeshift;
Al Viro30687e02013-10-03 12:25:10 -040090 struct rcu_head rcu;
Mikulas Patockaa64eefa2015-09-02 22:50:12 +020091
92 unsigned n_hotfixes;
93 secno hotfix_from[256];
94 secno hotfix_to[256];
Linus Torvalds1da177e2005-04-16 15:20:36 -070095};
96
Linus Torvalds1da177e2005-04-16 15:20:36 -070097/* Four 512-byte buffers and the 2k block obtained by concatenating them */
98
99struct quad_buffer_head {
100 struct buffer_head *bh[4];
101 void *data;
102};
103
104/* The b-tree down pointer from a dir entry */
105
106static inline dnode_secno de_down_pointer (struct hpfs_dirent *de)
107{
108 CHKCOND(de->down,("HPFS: de_down_pointer: !de->down\n"));
Al Viro46287aa2012-04-17 16:20:49 -0400109 return le32_to_cpu(*(__le32 *) ((void *) de + le16_to_cpu(de->length) - 4));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110}
111
112/* The first dir entry in a dnode */
113
114static inline struct hpfs_dirent *dnode_first_de (struct dnode *dnode)
115{
116 return (void *) dnode->dirent;
117}
118
119/* The end+1 of the dir entries */
120
121static inline struct hpfs_dirent *dnode_end_de (struct dnode *dnode)
122{
Mikulas Patocka0b697602011-05-08 20:44:26 +0200123 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)));
124 return (void *) dnode + le32_to_cpu(dnode->first_free);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125}
126
127/* The dir entry after dir entry de */
128
129static inline struct hpfs_dirent *de_next_de (struct hpfs_dirent *de)
130{
Mikulas Patocka0b697602011-05-08 20:44:26 +0200131 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)));
132 return (void *) de + le16_to_cpu(de->length);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133}
134
135static inline struct extended_attribute *fnode_ea(struct fnode *fnode)
136{
Mikulas Patocka0b697602011-05-08 20:44:26 +0200137 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 -0700138}
139
140static inline struct extended_attribute *fnode_end_ea(struct fnode *fnode)
141{
Mikulas Patocka0b697602011-05-08 20:44:26 +0200142 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 -0700143}
144
Mikulas Patockad0969d12011-05-08 20:44:32 +0200145static unsigned ea_valuelen(struct extended_attribute *ea)
146{
147 return ea->valuelen_lo + 256 * ea->valuelen_hi;
148}
149
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150static inline struct extended_attribute *next_ea(struct extended_attribute *ea)
151{
Mikulas Patockad0969d12011-05-08 20:44:32 +0200152 return (struct extended_attribute *)((char *)ea + 5 + ea->namelen + ea_valuelen(ea));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153}
154
155static inline secno ea_sec(struct extended_attribute *ea)
156{
Al Viro77ee26e42012-04-17 16:26:46 -0400157 return le32_to_cpu(get_unaligned((__le32 *)((char *)ea + 9 + ea->namelen)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158}
159
160static inline secno ea_len(struct extended_attribute *ea)
161{
Al Viro77ee26e42012-04-17 16:26:46 -0400162 return le32_to_cpu(get_unaligned((__le32 *)((char *)ea + 5 + ea->namelen)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163}
164
165static inline char *ea_data(struct extended_attribute *ea)
166{
167 return (char *)((char *)ea + 5 + ea->namelen);
168}
169
170static inline unsigned de_size(int namelen, secno down_ptr)
171{
172 return ((0x1f + namelen + 3) & ~3) + (down_ptr ? 4 : 0);
173}
174
175static inline void copy_de(struct hpfs_dirent *dst, struct hpfs_dirent *src)
176{
177 int a;
178 int n;
179 if (!dst || !src) return;
180 a = dst->down;
181 n = dst->not_8x3;
182 memcpy((char *)dst + 2, (char *)src + 2, 28);
183 dst->down = a;
184 dst->not_8x3 = n;
185}
186
Al Viro52576da2012-04-17 15:28:51 -0400187static inline unsigned tstbits(__le32 *bmp, unsigned b, unsigned n)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188{
189 int i;
190 if ((b >= 0x4000) || (b + n - 1 >= 0x4000)) return n;
Mikulas Patocka0b697602011-05-08 20:44:26 +0200191 if (!((le32_to_cpu(bmp[(b & 0x3fff) >> 5]) >> (b & 0x1f)) & 1)) return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192 for (i = 1; i < n; i++)
Mikulas Patocka0b697602011-05-08 20:44:26 +0200193 if (!((le32_to_cpu(bmp[((b+i) & 0x3fff) >> 5]) >> ((b+i) & 0x1f)) & 1))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194 return i + 1;
195 return 0;
196}
197
198/* alloc.c */
199
200int hpfs_chk_sectors(struct super_block *, secno, int, char *);
Mikulas Patocka7d23ce32011-05-08 20:43:06 +0200201secno hpfs_alloc_sector(struct super_block *, secno, unsigned, int);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202int hpfs_alloc_if_possible(struct super_block *, secno);
203void hpfs_free_sectors(struct super_block *, secno, unsigned);
204int hpfs_check_free_dnodes(struct super_block *, int);
205void hpfs_free_dnode(struct super_block *, secno);
Mikulas Patocka7d23ce32011-05-08 20:43:06 +0200206struct dnode *hpfs_alloc_dnode(struct super_block *, secno, dnode_secno *, struct quad_buffer_head *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207struct fnode *hpfs_alloc_fnode(struct super_block *, secno, fnode_secno *, struct buffer_head **);
208struct anode *hpfs_alloc_anode(struct super_block *, secno, anode_secno *, struct buffer_head **);
Mikulas Patockaa27b5b92015-06-28 15:16:57 +0200209int hpfs_trim_fs(struct super_block *, u64, u64, u64, unsigned *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210
211/* anode.c */
212
213secno hpfs_bplus_lookup(struct super_block *, struct inode *, struct bplus_header *, unsigned, struct buffer_head *);
214secno hpfs_add_sector_to_btree(struct super_block *, secno, int, unsigned);
215void hpfs_remove_btree(struct super_block *, struct bplus_header *);
216int hpfs_ea_read(struct super_block *, secno, int, unsigned, unsigned, char *);
Al Viro7e7742e2010-01-31 17:09:29 -0500217int hpfs_ea_write(struct super_block *, secno, int, unsigned, unsigned, const char *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218void hpfs_ea_remove(struct super_block *, secno, int, unsigned);
219void hpfs_truncate_btree(struct super_block *, secno, int, unsigned);
220void hpfs_remove_fnode(struct super_block *, fnode_secno fno);
221
222/* buffer.c */
223
Mikulas Patockaa64eefa2015-09-02 22:50:12 +0200224secno hpfs_search_hotfix_map(struct super_block *s, secno sec);
225unsigned hpfs_search_hotfix_map_for_range(struct super_block *s, secno sec, unsigned n);
Mikulas Patocka275f4952013-07-04 19:04:01 +0200226void hpfs_prefetch_sectors(struct super_block *, unsigned, int);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227void *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
Al Viro43d344d2011-01-12 16:12:05 -0500236extern const struct dentry_operations hpfs_dentry_operations;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237
238/* dir.c */
239
Al Viro00cd8dd2012-06-10 17:13:09 -0400240struct dentry *hpfs_lookup(struct inode *, struct dentry *, unsigned int);
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
Al Viroe82c3142016-05-12 19:35:57 -0400245int hpfs_add_pos(struct inode *, loff_t *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246void 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,
Mikulas Patocka7d23ce32011-05-08 20:43:06 +0200250 struct hpfs_dirent *);
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
Josef Bacik02c24a82011-07-16 20:44:56 -0400271int hpfs_file_fsync(struct file *, loff_t, loff_t, int);
Marco Stornelli70b31c42012-12-15 11:53:50 +0100272void hpfs_truncate(struct inode *);
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -0800273extern const struct file_operations hpfs_file_ops;
Arjan van de Ven92e1d5b2007-02-12 00:55:39 -0800274extern const struct inode_operations hpfs_file_iops;
Christoph Hellwigf5e54d62006-06-28 04:26:44 -0700275extern const struct address_space_operations hpfs_aops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276
277/* inode.c */
278
279void hpfs_init_inode(struct inode *);
280void hpfs_read_inode(struct inode *);
281void hpfs_write_inode(struct inode *);
282void hpfs_write_inode_nolock(struct inode *);
Christoph Hellwigca30bc92008-08-11 00:27:59 +0200283int hpfs_setattr(struct dentry *, struct iattr *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284void hpfs_write_if_changed(struct inode *);
Al Viroea544002010-06-07 00:18:40 -0400285void hpfs_evict_inode(struct inode *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286
287/* map.c */
288
Al Viro52576da2012-04-17 15:28:51 -0400289__le32 *hpfs_map_dnode_bitmap(struct super_block *, struct quad_buffer_head *);
290__le32 *hpfs_map_bitmap(struct super_block *, unsigned, struct quad_buffer_head *, char *);
Mikulas Patocka275f4952013-07-04 19:04:01 +0200291void hpfs_prefetch_bitmap(struct super_block *, unsigned);
Al Viro7e7742e2010-01-31 17:09:29 -0500292unsigned char *hpfs_load_code_page(struct super_block *, secno);
Al Viro28fe3c12012-04-17 16:41:13 -0400293__le32 *hpfs_load_bitmap_directory(struct super_block *, secno bmp);
Mikulas Patockaa64eefa2015-09-02 22:50:12 +0200294void hpfs_load_hotfix_map(struct super_block *s, struct hpfs_spare_block *spareblock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295struct fnode *hpfs_map_fnode(struct super_block *s, ino_t, struct buffer_head **);
296struct anode *hpfs_map_anode(struct super_block *s, anode_secno, struct buffer_head **);
297struct dnode *hpfs_map_dnode(struct super_block *s, dnode_secno, struct quad_buffer_head *);
298dnode_secno hpfs_fnode_dno(struct super_block *s, ino_t ino);
299
300/* name.c */
301
302unsigned char hpfs_upcase(unsigned char *, unsigned char);
Al Viro7e7742e2010-01-31 17:09:29 -0500303int hpfs_chk_name(const unsigned char *, unsigned *);
304unsigned char *hpfs_translate_name(struct super_block *, unsigned char *, unsigned, int, int);
305int hpfs_compare_names(struct super_block *, const unsigned char *, unsigned,
306 const unsigned char *, unsigned, int);
307int hpfs_is_name_long(const unsigned char *, unsigned);
308void hpfs_adjust_length(const unsigned char *, unsigned *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309
310/* namei.c */
311
Arjan van de Ven92e1d5b2007-02-12 00:55:39 -0800312extern const struct inode_operations hpfs_dir_iops;
Christoph Hellwigf5e54d62006-06-28 04:26:44 -0700313extern const struct address_space_operations hpfs_symlink_aops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314
315static inline struct hpfs_inode_info *hpfs_i(struct inode *inode)
316{
Rasmus Villemoesdb6172c2015-03-19 12:28:04 +0100317 return container_of(inode, struct hpfs_inode_info, vfs_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318}
319
320static inline struct hpfs_sb_info *hpfs_sb(struct super_block *sb)
321{
322 return sb->s_fs_info;
323}
324
325/* super.c */
326
Joe Perchesb9075fa2011-10-31 17:11:33 -0700327__printf(2, 3)
328void hpfs_error(struct super_block *, const char *, ...);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329int hpfs_stop_cycles(struct super_block *, int, int *, int *, char *);
Mikulas Patocka2cbe5c72014-01-29 00:10:44 +0100330unsigned hpfs_get_free_dnodes(struct super_block *);
Mikulas Patockaa27b5b92015-06-28 15:16:57 +0200331long hpfs_ioctl(struct file *file, unsigned cmd, unsigned long arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332
333/*
334 * local time (HPFS) to GMT (Unix)
335 */
336
337static inline time_t local_to_gmt(struct super_block *s, time32_t t)
338{
339 extern struct timezone sys_tz;
340 return t + sys_tz.tz_minuteswest * 60 + hpfs_sb(s)->sb_timeshift;
341}
342
343static inline time32_t gmt_to_local(struct super_block *s, time_t t)
344{
345 extern struct timezone sys_tz;
346 return t - sys_tz.tz_minuteswest * 60 - hpfs_sb(s)->sb_timeshift;
347}
Arnd Bergmann9a311b92011-01-22 20:26:12 +0100348
349/*
350 * Locking:
351 *
Mikulas Patocka7dd29d82011-05-08 20:42:54 +0200352 * hpfs_lock() locks the whole filesystem. It must be taken
353 * on any method called by the VFS.
Arnd Bergmann9a311b92011-01-22 20:26:12 +0100354 *
Mikulas Patocka7dd29d82011-05-08 20:42:54 +0200355 * We don't do any per-file locking anymore, it is hard to
356 * review and HPFS is not performance-sensitive anyway.
Arnd Bergmann9a311b92011-01-22 20:26:12 +0100357 */
358static inline void hpfs_lock(struct super_block *s)
359{
Mikulas Patocka7dd29d82011-05-08 20:42:54 +0200360 struct hpfs_sb_info *sbi = hpfs_sb(s);
361 mutex_lock(&sbi->hpfs_mutex);
Arnd Bergmann9a311b92011-01-22 20:26:12 +0100362}
363
364static inline void hpfs_unlock(struct super_block *s)
365{
Mikulas Patocka7dd29d82011-05-08 20:42:54 +0200366 struct hpfs_sb_info *sbi = hpfs_sb(s);
367 mutex_unlock(&sbi->hpfs_mutex);
368}
369
370static inline void hpfs_lock_assert(struct super_block *s)
371{
372 struct hpfs_sb_info *sbi = hpfs_sb(s);
373 WARN_ON(!mutex_is_locked(&sbi->hpfs_mutex));
Arnd Bergmann9a311b92011-01-22 20:26:12 +0100374}