1#ifndef _SYSV_H
2#define _SYSV_H
3
4#include <linux/buffer_head.h>
5
6typedef __u16 __bitwise __fs16;
7typedef __u32 __bitwise __fs32;
8
9#include <linux/sysv_fs.h>
10
11/*
12 * SystemV/V7/Coherent super-block data in memory
13 *
14 * The SystemV/V7/Coherent superblock contains dynamic data (it gets modified
15 * while the system is running). This is in contrast to the Minix and Berkeley
16 * filesystems (where the superblock is never modified). This affects the
17 * sync() operation: we must keep the superblock in a disk buffer and use this
18 * one as our "working copy".
19 */
20
21struct sysv_sb_info {
22	struct super_block *s_sb;	/* VFS superblock */
23	int	       s_type;		/* file system type: FSTYPE_{XENIX|SYSV|COH} */
24	char	       s_bytesex;	/* bytesex (le/be/pdp) */
25	char	       s_truncate;	/* if 1: names > SYSV_NAMELEN chars are truncated */
26					/* if 0: they are disallowed (ENAMETOOLONG) */
27	nlink_t        s_link_max;	/* max number of hard links to a file */
28	unsigned int   s_inodes_per_block;	/* number of inodes per block */
29	unsigned int   s_inodes_per_block_1;	/* inodes_per_block - 1 */
30	unsigned int   s_inodes_per_block_bits;	/* log2(inodes_per_block) */
31	unsigned int   s_ind_per_block;		/* number of indirections per block */
32	unsigned int   s_ind_per_block_bits;	/* log2(ind_per_block) */
33	unsigned int   s_ind_per_block_2;	/* ind_per_block ^ 2 */
34	unsigned int   s_toobig_block;		/* 10 + ipb + ipb^2 + ipb^3 */
35	unsigned int   s_block_base;	/* physical block number of block 0 */
36	unsigned short s_fic_size;	/* free inode cache size, NICINOD */
37	unsigned short s_flc_size;	/* free block list chunk size, NICFREE */
38	/* The superblock is kept in one or two disk buffers: */
39	struct buffer_head *s_bh1;
40	struct buffer_head *s_bh2;
41	/* These are pointers into the disk buffer, to compensate for
42	   different superblock layout. */
43	char *         s_sbd1;		/* entire superblock data, for part 1 */
44	char *         s_sbd2;		/* entire superblock data, for part 2 */
45	__fs16         *s_sb_fic_count;	/* pointer to s_sbd->s_ninode */
46        sysv_ino_t     *s_sb_fic_inodes; /* pointer to s_sbd->s_inode */
47	__fs16         *s_sb_total_free_inodes; /* pointer to s_sbd->s_tinode */
48	__fs16         *s_bcache_count;	/* pointer to s_sbd->s_nfree */
49	sysv_zone_t    *s_bcache;	/* pointer to s_sbd->s_free */
50	__fs32         *s_free_blocks;	/* pointer to s_sbd->s_tfree */
51	__fs32         *s_sb_time;	/* pointer to s_sbd->s_time */
52	__fs32         *s_sb_state;	/* pointer to s_sbd->s_state, only FSTYPE_SYSV */
53	/* We keep those superblock entities that don't change here;
54	   this saves us an indirection and perhaps a conversion. */
55	u32            s_firstinodezone; /* index of first inode zone */
56	u32            s_firstdatazone;	/* same as s_sbd->s_isize */
57	u32            s_ninodes;	/* total number of inodes */
58	u32            s_ndatazones;	/* total number of data zones */
59	u32            s_nzones;	/* same as s_sbd->s_fsize */
60	u16	       s_namelen;       /* max length of dir entry */
61	int	       s_forced_ro;
62};
63
64/*
65 * SystemV/V7/Coherent FS inode data in memory
66 */
67struct sysv_inode_info {
68	__fs32		i_data[13];
69	u32		i_dir_start_lookup;
70	struct inode	vfs_inode;
71};
72
73
74static inline struct sysv_inode_info *SYSV_I(struct inode *inode)
75{
76	return list_entry(inode, struct sysv_inode_info, vfs_inode);
77}
78
79static inline struct sysv_sb_info *SYSV_SB(struct super_block *sb)
80{
81	return sb->s_fs_info;
82}
83
84
85/* identify the FS in memory */
86enum {
87	FSTYPE_NONE = 0,
88	FSTYPE_XENIX,
89	FSTYPE_SYSV4,
90	FSTYPE_SYSV2,
91	FSTYPE_COH,
92	FSTYPE_V7,
93	FSTYPE_AFS,
94	FSTYPE_END,
95};
96
97#define SYSV_MAGIC_BASE		0x012FF7B3
98
99#define XENIX_SUPER_MAGIC	(SYSV_MAGIC_BASE+FSTYPE_XENIX)
100#define SYSV4_SUPER_MAGIC	(SYSV_MAGIC_BASE+FSTYPE_SYSV4)
101#define SYSV2_SUPER_MAGIC	(SYSV_MAGIC_BASE+FSTYPE_SYSV2)
102#define COH_SUPER_MAGIC		(SYSV_MAGIC_BASE+FSTYPE_COH)
103
104
105/* Admissible values for i_nlink: 0.._LINK_MAX */
106enum {
107	XENIX_LINK_MAX	=	126,	/* ?? */
108	SYSV_LINK_MAX	=	126,	/* 127? 251? */
109	V7_LINK_MAX     =	126,	/* ?? */
110	COH_LINK_MAX	=	10000,
111};
112
113
114static inline void dirty_sb(struct super_block *sb)
115{
116	struct sysv_sb_info *sbi = SYSV_SB(sb);
117
118	mark_buffer_dirty(sbi->s_bh1);
119	if (sbi->s_bh1 != sbi->s_bh2)
120		mark_buffer_dirty(sbi->s_bh2);
121	sb->s_dirt = 1;
122}
123
124
125/* ialloc.c */
126extern struct sysv_inode *sysv_raw_inode(struct super_block *, unsigned,
127			struct buffer_head **);
128extern struct inode * sysv_new_inode(const struct inode *, mode_t);
129extern void sysv_free_inode(struct inode *);
130extern unsigned long sysv_count_free_inodes(struct super_block *);
131
132/* balloc.c */
133extern sysv_zone_t sysv_new_block(struct super_block *);
134extern void sysv_free_block(struct super_block *, sysv_zone_t);
135extern unsigned long sysv_count_free_blocks(struct super_block *);
136
137/* itree.c */
138extern void sysv_truncate(struct inode *);
139
140/* inode.c */
141extern int sysv_write_inode(struct inode *, int);
142extern int sysv_sync_inode(struct inode *);
143extern int sysv_sync_file(struct file *, struct dentry *, int);
144extern void sysv_set_inode(struct inode *, dev_t);
145extern int sysv_getattr(struct vfsmount *, struct dentry *, struct kstat *);
146extern int sysv_init_icache(void);
147extern void sysv_destroy_icache(void);
148
149
150/* dir.c */
151extern struct sysv_dir_entry *sysv_find_entry(struct dentry *, struct page **);
152extern int sysv_add_link(struct dentry *, struct inode *);
153extern int sysv_delete_entry(struct sysv_dir_entry *, struct page *);
154extern int sysv_make_empty(struct inode *, struct inode *);
155extern int sysv_empty_dir(struct inode *);
156extern void sysv_set_link(struct sysv_dir_entry *, struct page *,
157			struct inode *);
158extern struct sysv_dir_entry *sysv_dotdot(struct inode *, struct page **);
159extern ino_t sysv_inode_by_name(struct dentry *);
160
161
162extern const struct inode_operations sysv_file_inode_operations;
163extern const struct inode_operations sysv_dir_inode_operations;
164extern const struct inode_operations sysv_fast_symlink_inode_operations;
165extern const struct file_operations sysv_file_operations;
166extern const struct file_operations sysv_dir_operations;
167extern const struct address_space_operations sysv_aops;
168extern const struct super_operations sysv_sops;
169extern struct dentry_operations sysv_dentry_operations;
170
171
172enum {
173	BYTESEX_LE,
174	BYTESEX_PDP,
175	BYTESEX_BE,
176};
177
178static inline u32 PDP_swab(u32 x)
179{
180#ifdef __LITTLE_ENDIAN
181	return ((x & 0xffff) << 16) | ((x & 0xffff0000) >> 16);
182#else
183#ifdef __BIG_ENDIAN
184	return ((x & 0xff00ff) << 8) | ((x & 0xff00ff00) >> 8);
185#else
186#error BYTESEX
187#endif
188#endif
189}
190
191static inline __u32 fs32_to_cpu(struct sysv_sb_info *sbi, __fs32 n)
192{
193	if (sbi->s_bytesex == BYTESEX_PDP)
194		return PDP_swab((__force __u32)n);
195	else if (sbi->s_bytesex == BYTESEX_LE)
196		return le32_to_cpu((__force __le32)n);
197	else
198		return be32_to_cpu((__force __be32)n);
199}
200
201static inline __fs32 cpu_to_fs32(struct sysv_sb_info *sbi, __u32 n)
202{
203	if (sbi->s_bytesex == BYTESEX_PDP)
204		return (__force __fs32)PDP_swab(n);
205	else if (sbi->s_bytesex == BYTESEX_LE)
206		return (__force __fs32)cpu_to_le32(n);
207	else
208		return (__force __fs32)cpu_to_be32(n);
209}
210
211static inline __fs32 fs32_add(struct sysv_sb_info *sbi, __fs32 *n, int d)
212{
213	if (sbi->s_bytesex == BYTESEX_PDP)
214		*(__u32*)n = PDP_swab(PDP_swab(*(__u32*)n)+d);
215	else if (sbi->s_bytesex == BYTESEX_LE)
216		*(__le32*)n = cpu_to_le32(le32_to_cpu(*(__le32*)n)+d);
217	else
218		*(__be32*)n = cpu_to_be32(be32_to_cpu(*(__be32*)n)+d);
219	return *n;
220}
221
222static inline __u16 fs16_to_cpu(struct sysv_sb_info *sbi, __fs16 n)
223{
224	if (sbi->s_bytesex != BYTESEX_BE)
225		return le16_to_cpu((__force __le16)n);
226	else
227		return be16_to_cpu((__force __be16)n);
228}
229
230static inline __fs16 cpu_to_fs16(struct sysv_sb_info *sbi, __u16 n)
231{
232	if (sbi->s_bytesex != BYTESEX_BE)
233		return (__force __fs16)cpu_to_le16(n);
234	else
235		return (__force __fs16)cpu_to_be16(n);
236}
237
238static inline __fs16 fs16_add(struct sysv_sb_info *sbi, __fs16 *n, int d)
239{
240	if (sbi->s_bytesex != BYTESEX_BE)
241		*(__le16*)n = cpu_to_le16(le16_to_cpu(*(__le16 *)n)+d);
242	else
243		*(__be16*)n = cpu_to_be16(be16_to_cpu(*(__be16 *)n)+d);
244	return *n;
245}
246
247#endif /* _SYSV_H */
248