1b2441318SGreg Kroah-Hartman /* SPDX-License-Identifier: GPL-2.0 */ 2e38be994SHitoshi Mitake #ifndef FS_MINIX_H 3e38be994SHitoshi Mitake #define FS_MINIX_H 4e38be994SHitoshi Mitake 51da177e4SLinus Torvalds #include <linux/fs.h> 61da177e4SLinus Torvalds #include <linux/pagemap.h> 71da177e4SLinus Torvalds #include <linux/minix_fs.h> 81da177e4SLinus Torvalds 91da177e4SLinus Torvalds #define INODE_VERSION(inode) minix_sb(inode->i_sb)->s_version 101da177e4SLinus Torvalds #define MINIX_V1 0x0001 /* original minix fs */ 111da177e4SLinus Torvalds #define MINIX_V2 0x0002 /* minix V2 fs */ 12939b00dfSAndries Brouwer #define MINIX_V3 0x0003 /* minix V3 fs */ 131da177e4SLinus Torvalds 141da177e4SLinus Torvalds /* 151da177e4SLinus Torvalds * minix fs inode data in memory 161da177e4SLinus Torvalds */ 171da177e4SLinus Torvalds struct minix_inode_info { 181da177e4SLinus Torvalds union { 191da177e4SLinus Torvalds __u16 i1_data[16]; 201da177e4SLinus Torvalds __u32 i2_data[16]; 211da177e4SLinus Torvalds } u; 221da177e4SLinus Torvalds struct inode vfs_inode; 231da177e4SLinus Torvalds }; 241da177e4SLinus Torvalds 251da177e4SLinus Torvalds /* 261da177e4SLinus Torvalds * minix super-block data in memory 271da177e4SLinus Torvalds */ 281da177e4SLinus Torvalds struct minix_sb_info { 291da177e4SLinus Torvalds unsigned long s_ninodes; 301da177e4SLinus Torvalds unsigned long s_nzones; 311da177e4SLinus Torvalds unsigned long s_imap_blocks; 321da177e4SLinus Torvalds unsigned long s_zmap_blocks; 331da177e4SLinus Torvalds unsigned long s_firstdatazone; 341da177e4SLinus Torvalds unsigned long s_log_zone_size; 351da177e4SLinus Torvalds int s_dirsize; 361da177e4SLinus Torvalds int s_namelen; 371da177e4SLinus Torvalds struct buffer_head ** s_imap; 381da177e4SLinus Torvalds struct buffer_head ** s_zmap; 391da177e4SLinus Torvalds struct buffer_head * s_sbh; 401da177e4SLinus Torvalds struct minix_super_block * s_ms; 411da177e4SLinus Torvalds unsigned short s_mount_state; 421da177e4SLinus Torvalds unsigned short s_version; 431da177e4SLinus Torvalds }; 441da177e4SLinus Torvalds 45a90a0880SDavid Howells extern struct inode *minix_iget(struct super_block *, unsigned long); 461da177e4SLinus Torvalds extern struct minix_inode * minix_V1_raw_inode(struct super_block *, ino_t, struct buffer_head **); 471da177e4SLinus Torvalds extern struct minix2_inode * minix_V2_raw_inode(struct super_block *, ino_t, struct buffer_head **); 48*4a29a126SAl Viro extern struct inode * minix_new_inode(const struct inode *, umode_t); 491da177e4SLinus Torvalds extern void minix_free_inode(struct inode * inode); 50016e8d44SJosh Boyer extern unsigned long minix_count_free_inodes(struct super_block *sb); 511da177e4SLinus Torvalds extern int minix_new_block(struct inode * inode); 52939b00dfSAndries Brouwer extern void minix_free_block(struct inode *inode, unsigned long block); 53016e8d44SJosh Boyer extern unsigned long minix_count_free_blocks(struct super_block *sb); 54549c7297SChristian Brauner extern int minix_getattr(struct user_namespace *, const struct path *, 55549c7297SChristian Brauner struct kstat *, u32, unsigned int); 56f4e420dcSChristoph Hellwig extern int minix_prepare_chunk(struct page *page, loff_t pos, unsigned len); 571da177e4SLinus Torvalds 581da177e4SLinus Torvalds extern void V1_minix_truncate(struct inode *); 591da177e4SLinus Torvalds extern void V2_minix_truncate(struct inode *); 601da177e4SLinus Torvalds extern void minix_truncate(struct inode *); 611da177e4SLinus Torvalds extern void minix_set_inode(struct inode *, dev_t); 621da177e4SLinus Torvalds extern int V1_minix_get_block(struct inode *, long, struct buffer_head *, int); 631da177e4SLinus Torvalds extern int V2_minix_get_block(struct inode *, long, struct buffer_head *, int); 64939b00dfSAndries Brouwer extern unsigned V1_minix_blocks(loff_t, struct super_block *); 65939b00dfSAndries Brouwer extern unsigned V2_minix_blocks(loff_t, struct super_block *); 661da177e4SLinus Torvalds 671da177e4SLinus Torvalds extern struct minix_dir_entry *minix_find_entry(struct dentry*, struct page**); 681da177e4SLinus Torvalds extern int minix_add_link(struct dentry*, struct inode*); 691da177e4SLinus Torvalds extern int minix_delete_entry(struct minix_dir_entry*, struct page*); 701da177e4SLinus Torvalds extern int minix_make_empty(struct inode*, struct inode*); 711da177e4SLinus Torvalds extern int minix_empty_dir(struct inode*); 721da177e4SLinus Torvalds extern void minix_set_link(struct minix_dir_entry*, struct page*, struct inode*); 731da177e4SLinus Torvalds extern struct minix_dir_entry *minix_dotdot(struct inode*, struct page**); 741da177e4SLinus Torvalds extern ino_t minix_inode_by_name(struct dentry*); 751da177e4SLinus Torvalds 7692e1d5beSArjan van de Ven extern const struct inode_operations minix_file_inode_operations; 7792e1d5beSArjan van de Ven extern const struct inode_operations minix_dir_inode_operations; 784b6f5d20SArjan van de Ven extern const struct file_operations minix_file_operations; 794b6f5d20SArjan van de Ven extern const struct file_operations minix_dir_operations; 801da177e4SLinus Torvalds 811da177e4SLinus Torvalds static inline struct minix_sb_info *minix_sb(struct super_block *sb) 821da177e4SLinus Torvalds { 831da177e4SLinus Torvalds return sb->s_fs_info; 841da177e4SLinus Torvalds } 851da177e4SLinus Torvalds 861da177e4SLinus Torvalds static inline struct minix_inode_info *minix_i(struct inode *inode) 871da177e4SLinus Torvalds { 88db6172c4SRasmus Villemoes return container_of(inode, struct minix_inode_info, vfs_inode); 891da177e4SLinus Torvalds } 90e38be994SHitoshi Mitake 91016e8d44SJosh Boyer static inline unsigned minix_blocks_needed(unsigned bits, unsigned blocksize) 92016e8d44SJosh Boyer { 93016e8d44SJosh Boyer return DIV_ROUND_UP(bits, blocksize * 8); 94016e8d44SJosh Boyer } 95016e8d44SJosh Boyer 9661f2e7b0SAkinobu Mita #if defined(CONFIG_MINIX_FS_NATIVE_ENDIAN) && \ 9761f2e7b0SAkinobu Mita defined(CONFIG_MINIX_FS_BIG_ENDIAN_16BIT_INDEXED) 9861f2e7b0SAkinobu Mita 9961f2e7b0SAkinobu Mita #error Minix file system byte order broken 10061f2e7b0SAkinobu Mita 10161f2e7b0SAkinobu Mita #elif defined(CONFIG_MINIX_FS_NATIVE_ENDIAN) 10261f2e7b0SAkinobu Mita 10361f2e7b0SAkinobu Mita /* 10461f2e7b0SAkinobu Mita * big-endian 32 or 64 bit indexed bitmaps on big-endian system or 10561f2e7b0SAkinobu Mita * little-endian bitmaps on little-endian system 10661f2e7b0SAkinobu Mita */ 10761f2e7b0SAkinobu Mita 10861f2e7b0SAkinobu Mita #define minix_test_and_set_bit(nr, addr) \ 10961f2e7b0SAkinobu Mita __test_and_set_bit((nr), (unsigned long *)(addr)) 11061f2e7b0SAkinobu Mita #define minix_set_bit(nr, addr) \ 11161f2e7b0SAkinobu Mita __set_bit((nr), (unsigned long *)(addr)) 11261f2e7b0SAkinobu Mita #define minix_test_and_clear_bit(nr, addr) \ 11361f2e7b0SAkinobu Mita __test_and_clear_bit((nr), (unsigned long *)(addr)) 11461f2e7b0SAkinobu Mita #define minix_test_bit(nr, addr) \ 11561f2e7b0SAkinobu Mita test_bit((nr), (unsigned long *)(addr)) 11661f2e7b0SAkinobu Mita #define minix_find_first_zero_bit(addr, size) \ 11761f2e7b0SAkinobu Mita find_first_zero_bit((unsigned long *)(addr), (size)) 11861f2e7b0SAkinobu Mita 11961f2e7b0SAkinobu Mita #elif defined(CONFIG_MINIX_FS_BIG_ENDIAN_16BIT_INDEXED) 12061f2e7b0SAkinobu Mita 12161f2e7b0SAkinobu Mita /* 12261f2e7b0SAkinobu Mita * big-endian 16bit indexed bitmaps 12361f2e7b0SAkinobu Mita */ 12461f2e7b0SAkinobu Mita 12561f2e7b0SAkinobu Mita static inline int minix_find_first_zero_bit(const void *vaddr, unsigned size) 12661f2e7b0SAkinobu Mita { 12761f2e7b0SAkinobu Mita const unsigned short *p = vaddr, *addr = vaddr; 12861f2e7b0SAkinobu Mita unsigned short num; 12961f2e7b0SAkinobu Mita 13061f2e7b0SAkinobu Mita if (!size) 13161f2e7b0SAkinobu Mita return 0; 13261f2e7b0SAkinobu Mita 133f1fd306aSAl Viro size >>= 4; 13461f2e7b0SAkinobu Mita while (*p++ == 0xffff) { 13561f2e7b0SAkinobu Mita if (--size == 0) 13661f2e7b0SAkinobu Mita return (p - addr) << 4; 13761f2e7b0SAkinobu Mita } 13861f2e7b0SAkinobu Mita 13961f2e7b0SAkinobu Mita num = *--p; 14061f2e7b0SAkinobu Mita return ((p - addr) << 4) + ffz(num); 14161f2e7b0SAkinobu Mita } 14261f2e7b0SAkinobu Mita 14361f2e7b0SAkinobu Mita #define minix_test_and_set_bit(nr, addr) \ 14461f2e7b0SAkinobu Mita __test_and_set_bit((nr) ^ 16, (unsigned long *)(addr)) 14561f2e7b0SAkinobu Mita #define minix_set_bit(nr, addr) \ 14661f2e7b0SAkinobu Mita __set_bit((nr) ^ 16, (unsigned long *)(addr)) 14761f2e7b0SAkinobu Mita #define minix_test_and_clear_bit(nr, addr) \ 14861f2e7b0SAkinobu Mita __test_and_clear_bit((nr) ^ 16, (unsigned long *)(addr)) 14961f2e7b0SAkinobu Mita 15061f2e7b0SAkinobu Mita static inline int minix_test_bit(int nr, const void *vaddr) 15161f2e7b0SAkinobu Mita { 15261f2e7b0SAkinobu Mita const unsigned short *p = vaddr; 15361f2e7b0SAkinobu Mita return (p[nr >> 4] & (1U << (nr & 15))) != 0; 15461f2e7b0SAkinobu Mita } 15561f2e7b0SAkinobu Mita 15661f2e7b0SAkinobu Mita #else 15761f2e7b0SAkinobu Mita 15861f2e7b0SAkinobu Mita /* 15961f2e7b0SAkinobu Mita * little-endian bitmaps 16061f2e7b0SAkinobu Mita */ 16161f2e7b0SAkinobu Mita 16261f2e7b0SAkinobu Mita #define minix_test_and_set_bit __test_and_set_bit_le 16361f2e7b0SAkinobu Mita #define minix_set_bit __set_bit_le 16461f2e7b0SAkinobu Mita #define minix_test_and_clear_bit __test_and_clear_bit_le 16561f2e7b0SAkinobu Mita #define minix_test_bit test_bit_le 16661f2e7b0SAkinobu Mita #define minix_find_first_zero_bit find_first_zero_bit_le 16761f2e7b0SAkinobu Mita 16861f2e7b0SAkinobu Mita #endif 16961f2e7b0SAkinobu Mita 170e38be994SHitoshi Mitake #endif /* FS_MINIX_H */ 171