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