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Diffstat (limited to 'fs/minix/minix.h')
| -rw-r--r-- | fs/minix/minix.h | 170 |
1 files changed, 170 insertions, 0 deletions
diff --git a/fs/minix/minix.h b/fs/minix/minix.h new file mode 100644 index 000000000..202173368 --- /dev/null +++ b/fs/minix/minix.h @@ -0,0 +1,170 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef FS_MINIX_H +#define FS_MINIX_H + +#include <linux/fs.h> +#include <linux/pagemap.h> +#include <linux/minix_fs.h> + +#define INODE_VERSION(inode) minix_sb(inode->i_sb)->s_version +#define MINIX_V1 0x0001 /* original minix fs */ +#define MINIX_V2 0x0002 /* minix V2 fs */ +#define MINIX_V3 0x0003 /* minix V3 fs */ + +/* + * minix fs inode data in memory + */ +struct minix_inode_info { + union { + __u16 i1_data[16]; + __u32 i2_data[16]; + } u; + struct inode vfs_inode; +}; + +/* + * minix super-block data in memory + */ +struct minix_sb_info { + unsigned long s_ninodes; + unsigned long s_nzones; + unsigned long s_imap_blocks; + unsigned long s_zmap_blocks; + unsigned long s_firstdatazone; + unsigned long s_log_zone_size; + int s_dirsize; + int s_namelen; + struct buffer_head ** s_imap; + struct buffer_head ** s_zmap; + struct buffer_head * s_sbh; + struct minix_super_block * s_ms; + unsigned short s_mount_state; + unsigned short s_version; +}; + +extern struct inode *minix_iget(struct super_block *, unsigned long); +extern struct minix_inode * minix_V1_raw_inode(struct super_block *, ino_t, struct buffer_head **); +extern struct minix2_inode * minix_V2_raw_inode(struct super_block *, ino_t, struct buffer_head **); +extern struct inode * minix_new_inode(const struct inode *, umode_t, int *); +extern void minix_free_inode(struct inode * inode); +extern unsigned long minix_count_free_inodes(struct super_block *sb); +extern int minix_new_block(struct inode * inode); +extern void minix_free_block(struct inode *inode, unsigned long block); +extern unsigned long minix_count_free_blocks(struct super_block *sb); +extern int minix_getattr(struct user_namespace *, const struct path *, + struct kstat *, u32, unsigned int); +extern int minix_prepare_chunk(struct page *page, loff_t pos, unsigned len); + +extern void V1_minix_truncate(struct inode *); +extern void V2_minix_truncate(struct inode *); +extern void minix_truncate(struct inode *); +extern void minix_set_inode(struct inode *, dev_t); +extern int V1_minix_get_block(struct inode *, long, struct buffer_head *, int); +extern int V2_minix_get_block(struct inode *, long, struct buffer_head *, int); +extern unsigned V1_minix_blocks(loff_t, struct super_block *); +extern unsigned V2_minix_blocks(loff_t, struct super_block *); + +extern struct minix_dir_entry *minix_find_entry(struct dentry*, struct page**); +extern int minix_add_link(struct dentry*, struct inode*); +extern int minix_delete_entry(struct minix_dir_entry*, struct page*); +extern int minix_make_empty(struct inode*, struct inode*); +extern int minix_empty_dir(struct inode*); +extern void minix_set_link(struct minix_dir_entry*, struct page*, struct inode*); +extern struct minix_dir_entry *minix_dotdot(struct inode*, struct page**); +extern ino_t minix_inode_by_name(struct dentry*); + +extern const struct inode_operations minix_file_inode_operations; +extern const struct inode_operations minix_dir_inode_operations; +extern const struct file_operations minix_file_operations; +extern const struct file_operations minix_dir_operations; + +static inline struct minix_sb_info *minix_sb(struct super_block *sb) +{ + return sb->s_fs_info; +} + +static inline struct minix_inode_info *minix_i(struct inode *inode) +{ + return container_of(inode, struct minix_inode_info, vfs_inode); +} + +static inline unsigned minix_blocks_needed(unsigned bits, unsigned blocksize) +{ + return DIV_ROUND_UP(bits, blocksize * 8); +} + +#if defined(CONFIG_MINIX_FS_NATIVE_ENDIAN) && \ + defined(CONFIG_MINIX_FS_BIG_ENDIAN_16BIT_INDEXED) + +#error Minix file system byte order broken + +#elif defined(CONFIG_MINIX_FS_NATIVE_ENDIAN) + +/* + * big-endian 32 or 64 bit indexed bitmaps on big-endian system or + * little-endian bitmaps on little-endian system + */ + +#define minix_test_and_set_bit(nr, addr) \ + __test_and_set_bit((nr), (unsigned long *)(addr)) +#define minix_set_bit(nr, addr) \ + __set_bit((nr), (unsigned long *)(addr)) +#define minix_test_and_clear_bit(nr, addr) \ + __test_and_clear_bit((nr), (unsigned long *)(addr)) +#define minix_test_bit(nr, addr) \ + test_bit((nr), (unsigned long *)(addr)) +#define minix_find_first_zero_bit(addr, size) \ + find_first_zero_bit((unsigned long *)(addr), (size)) + +#elif defined(CONFIG_MINIX_FS_BIG_ENDIAN_16BIT_INDEXED) + +/* + * big-endian 16bit indexed bitmaps + */ + +static inline int minix_find_first_zero_bit(const void *vaddr, unsigned size) +{ + const unsigned short *p = vaddr, *addr = vaddr; + unsigned short num; + + if (!size) + return 0; + + size >>= 4; + while (*p++ == 0xffff) { + if (--size == 0) + return (p - addr) << 4; + } + + num = *--p; + return ((p - addr) << 4) + ffz(num); +} + +#define minix_test_and_set_bit(nr, addr) \ + __test_and_set_bit((nr) ^ 16, (unsigned long *)(addr)) +#define minix_set_bit(nr, addr) \ + __set_bit((nr) ^ 16, (unsigned long *)(addr)) +#define minix_test_and_clear_bit(nr, addr) \ + __test_and_clear_bit((nr) ^ 16, (unsigned long *)(addr)) + +static inline int minix_test_bit(int nr, const void *vaddr) +{ + const unsigned short *p = vaddr; + return (p[nr >> 4] & (1U << (nr & 15))) != 0; +} + +#else + +/* + * little-endian bitmaps + */ + +#define minix_test_and_set_bit __test_and_set_bit_le +#define minix_set_bit __set_bit_le +#define minix_test_and_clear_bit __test_and_clear_bit_le +#define minix_test_bit test_bit_le +#define minix_find_first_zero_bit find_first_zero_bit_le + +#endif + +#endif /* FS_MINIX_H */ |