minix.h

  1/* SPDX-License-Identifier: GPL-2.0 */
  2#ifndef FS_MINIX_H
  3#define FS_MINIX_H
  4
  5#include <linux/fs.h>
  6#include <linux/pagemap.h>
  7#include <linux/minix_fs.h>
  8
  9#define INODE_VERSION(inode)	minix_sb(inode->i_sb)->s_version
 10#define MINIX_V1		0x0001		/* original minix fs */
 11#define MINIX_V2		0x0002		/* minix V2 fs */
 12#define MINIX_V3		0x0003		/* minix V3 fs */
 13
 14/*
 15 * minix fs inode data in memory
 16 */
 17struct minix_inode_info {
 18	union {
 19		__u16 i1_data[16];
 20		__u32 i2_data[16];
 21	} u;
 22	struct inode vfs_inode;
 23};
 24
 25/*
 26 * minix super-block data in memory
 27 */
 28struct minix_sb_info {
 29	unsigned long s_ninodes;
 30	unsigned long s_nzones;
 31	unsigned long s_imap_blocks;
 32	unsigned long s_zmap_blocks;
 33	unsigned long s_firstdatazone;
 34	unsigned long s_log_zone_size;
 35	int s_dirsize;
 36	int s_namelen;
 37	struct buffer_head ** s_imap;
 38	struct buffer_head ** s_zmap;
 39	struct buffer_head * s_sbh;
 40	struct minix_super_block * s_ms;
 41	unsigned short s_mount_state;
 42	unsigned short s_version;
 43};
 44
 45void __minix_error_inode(struct inode *inode, const char *function,
 46			 unsigned int line, const char *fmt, ...);
 47
 48struct inode *minix_iget(struct super_block *, unsigned long);
 49struct minix_inode *minix_V1_raw_inode(struct super_block *, ino_t, struct buffer_head **);
 50struct minix2_inode *minix_V2_raw_inode(struct super_block *, ino_t, struct buffer_head **);
 51struct inode *minix_new_inode(const struct inode *, umode_t);
 52void minix_free_inode(struct inode *inode);
 53unsigned long minix_count_free_inodes(struct super_block *sb);
 54int minix_new_block(struct inode *inode);
 55void minix_free_block(struct inode *inode, unsigned long block);
 56unsigned long minix_count_free_blocks(struct super_block *sb);
 57int minix_getattr(struct mnt_idmap *, const struct path *,
 58		struct kstat *, u32, unsigned int);
 59int minix_prepare_chunk(struct folio *folio, loff_t pos, unsigned len);
 60
 61extern void V1_minix_truncate(struct inode *);
 62extern void V2_minix_truncate(struct inode *);
 63extern void minix_truncate(struct inode *);
 64extern void minix_set_inode(struct inode *, dev_t);
 65extern int V1_minix_get_block(struct inode *, long, struct buffer_head *, int);
 66extern int V2_minix_get_block(struct inode *, long, struct buffer_head *, int);
 67extern unsigned V1_minix_blocks(loff_t, struct super_block *);
 68extern unsigned V2_minix_blocks(loff_t, struct super_block *);
 69
 70struct minix_dir_entry *minix_find_entry(struct dentry *, struct folio **);
 71int minix_add_link(struct dentry*, struct inode*);
 72int minix_delete_entry(struct minix_dir_entry *, struct folio *);
 73int minix_make_empty(struct inode*, struct inode*);
 74int minix_empty_dir(struct inode*);
 75int minix_set_link(struct minix_dir_entry *de, struct folio *folio,
 76		struct inode *inode);
 77struct minix_dir_entry *minix_dotdot(struct inode*, struct folio **);
 78ino_t minix_inode_by_name(struct dentry*);
 79
 80extern const struct inode_operations minix_file_inode_operations;
 81extern const struct inode_operations minix_dir_inode_operations;
 82extern const struct file_operations minix_file_operations;
 83extern const struct file_operations minix_dir_operations;
 84
 85static inline struct minix_sb_info *minix_sb(struct super_block *sb)
 86{
 87	return sb->s_fs_info;
 88}
 89
 90static inline struct minix_inode_info *minix_i(struct inode *inode)
 91{
 92	return container_of(inode, struct minix_inode_info, vfs_inode);
 93}
 94
 95static inline unsigned minix_blocks_needed(unsigned bits, unsigned blocksize)
 96{
 97	return DIV_ROUND_UP(bits, blocksize * 8);
 98}
 99
100#if defined(CONFIG_MINIX_FS_NATIVE_ENDIAN) && \
101	defined(CONFIG_MINIX_FS_BIG_ENDIAN_16BIT_INDEXED)
102
103#error Minix file system byte order broken
104
105#elif defined(CONFIG_MINIX_FS_NATIVE_ENDIAN)
106
107/*
108 * big-endian 32 or 64 bit indexed bitmaps on big-endian system or
109 * little-endian bitmaps on little-endian system
110 */
111
112#define minix_test_and_set_bit(nr, addr)	\
113	__test_and_set_bit((nr), (unsigned long *)(addr))
114#define minix_set_bit(nr, addr)		\
115	__set_bit((nr), (unsigned long *)(addr))
116#define minix_test_and_clear_bit(nr, addr) \
117	__test_and_clear_bit((nr), (unsigned long *)(addr))
118#define minix_test_bit(nr, addr)		\
119	test_bit((nr), (unsigned long *)(addr))
120#define minix_find_first_zero_bit(addr, size) \
121	find_first_zero_bit((unsigned long *)(addr), (size))
122
123#elif defined(CONFIG_MINIX_FS_BIG_ENDIAN_16BIT_INDEXED)
124
125/*
126 * big-endian 16bit indexed bitmaps
127 */
128
129static inline int minix_find_first_zero_bit(const void *vaddr, unsigned size)
130{
131	const unsigned short *p = vaddr, *addr = vaddr;
132	unsigned short num;
133
134	if (!size)
135		return 0;
136
137	size >>= 4;
138	while (*p++ == 0xffff) {
139		if (--size == 0)
140			return (p - addr) << 4;
141	}
142
143	num = *--p;
144	return ((p - addr) << 4) + ffz(num);
145}
146
147#define minix_test_and_set_bit(nr, addr)	\
148	__test_and_set_bit((nr) ^ 16, (unsigned long *)(addr))
149#define minix_set_bit(nr, addr)	\
150	__set_bit((nr) ^ 16, (unsigned long *)(addr))
151#define minix_test_and_clear_bit(nr, addr)	\
152	__test_and_clear_bit((nr) ^ 16, (unsigned long *)(addr))
153
154static inline int minix_test_bit(int nr, const void *vaddr)
155{
156	const unsigned short *p = vaddr;
157	return (p[nr >> 4] & (1U << (nr & 15))) != 0;
158}
159
160#else
161
162/*
163 * little-endian bitmaps
164 */
165
166#define minix_test_and_set_bit	__test_and_set_bit_le
167#define minix_set_bit		__set_bit_le
168#define minix_test_and_clear_bit	__test_and_clear_bit_le
169#define minix_test_bit	test_bit_le
170#define minix_find_first_zero_bit	find_first_zero_bit_le
171
172#endif
173
174#define minix_error_inode(inode, fmt, ...)			\
175	__minix_error_inode((inode), __func__, __LINE__,	\
176			    (fmt), ##__VA_ARGS__)
177
178#define EFSCORRUPTED	EUCLEAN		/* Filesystem is corrupted */
179
180#endif /* FS_MINIX_H */