248 lines
7.7 KiB
C
248 lines
7.7 KiB
C
|
/* SPDX-License-Identifier: GPL-2.0 */
|
||
|
|
#ifndef _SYSV_H
|
||
|
|
#define _SYSV_H
|
||
|
|
|
||
|
|
#include <linux/buffer_head.h>
|
||
|
|
|
||
|
|
typedef __u16 __bitwise __fs16;
|
||
|
|
typedef __u32 __bitwise __fs32;
|
||
|
|
|
||
|
|
#include <linux/sysv_fs.h>
|
||
|
|
|
||
|
|
/*
|
||
|
|
* SystemV/V7/Coherent super-block data in memory
|
||
|
|
*
|
||
|
|
* The SystemV/V7/Coherent superblock contains dynamic data (it gets modified
|
||
|
|
* while the system is running). This is in contrast to the Minix and Berkeley
|
||
|
|
* filesystems (where the superblock is never modified). This affects the
|
||
|
|
* sync() operation: we must keep the superblock in a disk buffer and use this
|
||
|
|
* one as our "working copy".
|
||
|
|
*/
|
||
|
|
|
||
|
|
struct sysv_sb_info {
|
||
|
|
struct super_block *s_sb; /* VFS superblock */
|
||
|
|
int s_type; /* file system type: FSTYPE_{XENIX|SYSV|COH} */
|
||
|
|
char s_bytesex; /* bytesex (le/be/pdp) */
|
||
|
|
char s_truncate; /* if 1: names > SYSV_NAMELEN chars are truncated */
|
||
|
|
/* if 0: they are disallowed (ENAMETOOLONG) */
|
||
|
|
unsigned int s_inodes_per_block; /* number of inodes per block */
|
||
|
|
unsigned int s_inodes_per_block_1; /* inodes_per_block - 1 */
|
||
|
|
unsigned int s_inodes_per_block_bits; /* log2(inodes_per_block) */
|
||
|
|
unsigned int s_ind_per_block; /* number of indirections per block */
|
||
|
|
unsigned int s_ind_per_block_bits; /* log2(ind_per_block) */
|
||
|
|
unsigned int s_ind_per_block_2; /* ind_per_block ^ 2 */
|
||
|
|
unsigned int s_toobig_block; /* 10 + ipb + ipb^2 + ipb^3 */
|
||
|
|
unsigned int s_block_base; /* physical block number of block 0 */
|
||
|
|
unsigned short s_fic_size; /* free inode cache size, NICINOD */
|
||
|
|
unsigned short s_flc_size; /* free block list chunk size, NICFREE */
|
||
|
|
/* The superblock is kept in one or two disk buffers: */
|
||
|
|
struct buffer_head *s_bh1;
|
||
|
|
struct buffer_head *s_bh2;
|
||
|
|
/* These are pointers into the disk buffer, to compensate for
|
||
|
|
different superblock layout. */
|
||
|
|
char * s_sbd1; /* entire superblock data, for part 1 */
|
||
|
|
char * s_sbd2; /* entire superblock data, for part 2 */
|
||
|
|
__fs16 *s_sb_fic_count; /* pointer to s_sbd->s_ninode */
|
||
|
|
sysv_ino_t *s_sb_fic_inodes; /* pointer to s_sbd->s_inode */
|
||
|
|
__fs16 *s_sb_total_free_inodes; /* pointer to s_sbd->s_tinode */
|
||
|
|
__fs16 *s_bcache_count; /* pointer to s_sbd->s_nfree */
|
||
|
|
sysv_zone_t *s_bcache; /* pointer to s_sbd->s_free */
|
||
|
|
__fs32 *s_free_blocks; /* pointer to s_sbd->s_tfree */
|
||
|
|
__fs32 *s_sb_time; /* pointer to s_sbd->s_time */
|
||
|
|
__fs32 *s_sb_state; /* pointer to s_sbd->s_state, only FSTYPE_SYSV */
|
||
|
|
/* We keep those superblock entities that don't change here;
|
||
|
|
this saves us an indirection and perhaps a conversion. */
|
||
|
|
u32 s_firstinodezone; /* index of first inode zone */
|
||
|
|
u32 s_firstdatazone; /* same as s_sbd->s_isize */
|
||
|
|
u32 s_ninodes; /* total number of inodes */
|
||
|
|
u32 s_ndatazones; /* total number of data zones */
|
||
|
|
u32 s_nzones; /* same as s_sbd->s_fsize */
|
||
|
|
u16 s_namelen; /* max length of dir entry */
|
||
|
|
int s_forced_ro;
|
||
|
|
struct mutex s_lock;
|
||
|
|
};
|
||
|
|
|
||
|
|
/*
|
||
|
|
* SystemV/V7/Coherent FS inode data in memory
|
||
|
|
*/
|
||
|
|
struct sysv_inode_info {
|
||
|
|
__fs32 i_data[13];
|
||
|
|
u32 i_dir_start_lookup;
|
||
|
|
struct inode vfs_inode;
|
||
|
|
};
|
||
|
|
|
||
|
|
|
||
|
|
static inline struct sysv_inode_info *SYSV_I(struct inode *inode)
|
||
|
|
{
|
||
|
|
return container_of(inode, struct sysv_inode_info, vfs_inode);
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline struct sysv_sb_info *SYSV_SB(struct super_block *sb)
|
||
|
|
{
|
||
|
|
return sb->s_fs_info;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
/* identify the FS in memory */
|
||
|
|
enum {
|
||
|
|
FSTYPE_NONE = 0,
|
||
|
|
FSTYPE_XENIX,
|
||
|
|
FSTYPE_SYSV4,
|
||
|
|
FSTYPE_SYSV2,
|
||
|
|
FSTYPE_COH,
|
||
|
|
FSTYPE_V7,
|
||
|
|
FSTYPE_AFS,
|
||
|
|
FSTYPE_END,
|
||
|
|
};
|
||
|
|
|
||
|
|
#define SYSV_MAGIC_BASE 0x012FF7B3
|
||
|
|
|
||
|
|
#define XENIX_SUPER_MAGIC (SYSV_MAGIC_BASE+FSTYPE_XENIX)
|
||
|
|
#define SYSV4_SUPER_MAGIC (SYSV_MAGIC_BASE+FSTYPE_SYSV4)
|
||
|
|
#define SYSV2_SUPER_MAGIC (SYSV_MAGIC_BASE+FSTYPE_SYSV2)
|
||
|
|
#define COH_SUPER_MAGIC (SYSV_MAGIC_BASE+FSTYPE_COH)
|
||
|
|
|
||
|
|
|
||
|
|
/* Admissible values for i_nlink: 0.._LINK_MAX */
|
||
|
|
enum {
|
||
|
|
XENIX_LINK_MAX = 126, /* ?? */
|
||
|
|
SYSV_LINK_MAX = 126, /* 127? 251? */
|
||
|
|
V7_LINK_MAX = 126, /* ?? */
|
||
|
|
COH_LINK_MAX = 10000,
|
||
|
|
};
|
||
|
|
|
||
|
|
|
||
|
|
static inline void dirty_sb(struct super_block *sb)
|
||
|
|
{
|
||
|
|
struct sysv_sb_info *sbi = SYSV_SB(sb);
|
||
|
|
|
||
|
|
mark_buffer_dirty(sbi->s_bh1);
|
||
|
|
if (sbi->s_bh1 != sbi->s_bh2)
|
||
|
|
mark_buffer_dirty(sbi->s_bh2);
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
/* ialloc.c */
|
||
|
|
extern struct sysv_inode *sysv_raw_inode(struct super_block *, unsigned,
|
||
|
|
struct buffer_head **);
|
||
|
|
extern struct inode * sysv_new_inode(const struct inode *, umode_t);
|
||
|
|
extern void sysv_free_inode(struct inode *);
|
||
|
|
extern unsigned long sysv_count_free_inodes(struct super_block *);
|
||
|
|
|
||
|
|
/* balloc.c */
|
||
|
|
extern sysv_zone_t sysv_new_block(struct super_block *);
|
||
|
|
extern void sysv_free_block(struct super_block *, sysv_zone_t);
|
||
|
|
extern unsigned long sysv_count_free_blocks(struct super_block *);
|
||
|
|
|
||
|
|
/* itree.c */
|
||
|
|
extern void sysv_truncate(struct inode *);
|
||
|
|
extern int sysv_prepare_chunk(struct page *page, loff_t pos, unsigned len);
|
||
|
|
|
||
|
|
/* inode.c */
|
||
|
|
extern struct inode *sysv_iget(struct super_block *, unsigned int);
|
||
|
|
extern int sysv_write_inode(struct inode *, struct writeback_control *wbc);
|
||
|
|
extern int sysv_sync_inode(struct inode *);
|
||
|
|
extern void sysv_set_inode(struct inode *, dev_t);
|
||
|
|
extern int sysv_getattr(const struct path *, struct kstat *, u32, unsigned int);
|
||
|
|
extern int sysv_init_icache(void);
|
||
|
|
extern void sysv_destroy_icache(void);
|
||
|
|
|
||
|
|
|
||
|
|
/* dir.c */
|
||
|
|
extern struct sysv_dir_entry *sysv_find_entry(struct dentry *, struct page **);
|
||
|
|
extern int sysv_add_link(struct dentry *, struct inode *);
|
||
|
|
extern int sysv_delete_entry(struct sysv_dir_entry *, struct page *);
|
||
|
|
extern int sysv_make_empty(struct inode *, struct inode *);
|
||
|
|
extern int sysv_empty_dir(struct inode *);
|
||
|
|
extern void sysv_set_link(struct sysv_dir_entry *, struct page *,
|
||
|
|
struct inode *);
|
||
|
|
extern struct sysv_dir_entry *sysv_dotdot(struct inode *, struct page **);
|
||
|
|
extern ino_t sysv_inode_by_name(struct dentry *);
|
||
|
|
|
||
|
|
|
||
|
|
extern const struct inode_operations sysv_file_inode_operations;
|
||
|
|
extern const struct inode_operations sysv_dir_inode_operations;
|
||
|
|
extern const struct file_operations sysv_file_operations;
|
||
|
|
extern const struct file_operations sysv_dir_operations;
|
||
|
|
extern const struct address_space_operations sysv_aops;
|
||
|
|
extern const struct super_operations sysv_sops;
|
||
|
|
extern const struct dentry_operations sysv_dentry_operations;
|
||
|
|
|
||
|
|
|
||
|
|
enum {
|
||
|
|
BYTESEX_LE,
|
||
|
|
BYTESEX_PDP,
|
||
|
|
BYTESEX_BE,
|
||
|
|
};
|
||
|
|
|
||
|
|
static inline u32 PDP_swab(u32 x)
|
||
|
|
{
|
||
|
|
#ifdef __LITTLE_ENDIAN
|
||
|
|
return ((x & 0xffff) << 16) | ((x & 0xffff0000) >> 16);
|
||
|
|
#else
|
||
|
|
#ifdef __BIG_ENDIAN
|
||
|
|
return ((x & 0xff00ff) << 8) | ((x & 0xff00ff00) >> 8);
|
||
|
|
#else
|
||
|
|
#error BYTESEX
|
||
|
|
#endif
|
||
|
|
#endif
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline __u32 fs32_to_cpu(struct sysv_sb_info *sbi, __fs32 n)
|
||
|
|
{
|
||
|
|
if (sbi->s_bytesex == BYTESEX_PDP)
|
||
|
|
return PDP_swab((__force __u32)n);
|
||
|
|
else if (sbi->s_bytesex == BYTESEX_LE)
|
||
|
|
return le32_to_cpu((__force __le32)n);
|
||
|
|
else
|
||
|
|
return be32_to_cpu((__force __be32)n);
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline __fs32 cpu_to_fs32(struct sysv_sb_info *sbi, __u32 n)
|
||
|
|
{
|
||
|
|
if (sbi->s_bytesex == BYTESEX_PDP)
|
||
|
|
return (__force __fs32)PDP_swab(n);
|
||
|
|
else if (sbi->s_bytesex == BYTESEX_LE)
|
||
|
|
return (__force __fs32)cpu_to_le32(n);
|
||
|
|
else
|
||
|
|
return (__force __fs32)cpu_to_be32(n);
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline __fs32 fs32_add(struct sysv_sb_info *sbi, __fs32 *n, int d)
|
||
|
|
{
|
||
|
|
if (sbi->s_bytesex == BYTESEX_PDP)
|
||
|
|
*(__u32*)n = PDP_swab(PDP_swab(*(__u32*)n)+d);
|
||
|
|
else if (sbi->s_bytesex == BYTESEX_LE)
|
||
|
|
le32_add_cpu((__le32 *)n, d);
|
||
|
|
else
|
||
|
|
be32_add_cpu((__be32 *)n, d);
|
||
|
|
return *n;
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline __u16 fs16_to_cpu(struct sysv_sb_info *sbi, __fs16 n)
|
||
|
|
{
|
||
|
|
if (sbi->s_bytesex != BYTESEX_BE)
|
||
|
|
return le16_to_cpu((__force __le16)n);
|
||
|
|
else
|
||
|
|
return be16_to_cpu((__force __be16)n);
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline __fs16 cpu_to_fs16(struct sysv_sb_info *sbi, __u16 n)
|
||
|
|
{
|
||
|
|
if (sbi->s_bytesex != BYTESEX_BE)
|
||
|
|
return (__force __fs16)cpu_to_le16(n);
|
||
|
|
else
|
||
|
|
return (__force __fs16)cpu_to_be16(n);
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline __fs16 fs16_add(struct sysv_sb_info *sbi, __fs16 *n, int d)
|
||
|
|
{
|
||
|
|
if (sbi->s_bytesex != BYTESEX_BE)
|
||
|
|
le16_add_cpu((__le16 *)n, d);
|
||
|
|
else
|
||
|
|
be16_add_cpu((__be16 *)n, d);
|
||
|
|
return *n;
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif /* _SYSV_H */
|