hpfs_fn.h
上传用户:lgb322
上传日期:2013-02-24
资源大小:30529k
文件大小:11k
- /*
- * linux/fs/hpfs/hpfs_fn.h
- *
- * Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999
- *
- * function headers
- */
- //#define DBG
- //#define DEBUG_LOCKS
- #include <linux/fs.h>
- #include <linux/hpfs_fs.h>
- #include <linux/errno.h>
- #include <linux/slab.h>
- #include <linux/kernel.h>
- #include <linux/sched.h>
- #include <linux/locks.h>
- #include <linux/stat.h>
- #include <linux/string.h>
- #include <asm/bitops.h>
- #include <asm/segment.h>
- #include <asm/uaccess.h>
- #include <linux/smp_lock.h>
- #include <stdarg.h>
- #include "hpfs.h"
- #define memcpy_tofs memcpy
- #define memcpy_fromfs memcpy
- #define EIOERROR EIO
- #define EFSERROR EPERM
- #define EMEMERROR ENOMEM
- #define ANODE_ALLOC_FWD 512
- #define FNODE_ALLOC_FWD 0
- #define ALLOC_FWD_MIN 16
- #define ALLOC_FWD_MAX 128
- #define ALLOC_M 1
- #define FNODE_RD_AHEAD 16
- #define ANODE_RD_AHEAD 16
- #define DNODE_RD_AHEAD 4
- #define FREE_DNODES_ADD 58
- #define FREE_DNODES_DEL 29
- #define CHKCOND(x,y) if (!(x)) printk y
- #ifdef DBG
- #define PRINTK(x) printk x
- #else
- #undef PRINTK
- #define PRINTK(x)
- #endif
- typedef void nonconst; /* What this is for ? */
- /*
- * local time (HPFS) to GMT (Unix)
- */
- extern inline time_t local_to_gmt(struct super_block *s, time_t t)
- {
- extern struct timezone sys_tz;
- return t + sys_tz.tz_minuteswest * 60 + s->s_hpfs_timeshift;
- }
- extern inline time_t gmt_to_local(struct super_block *s, time_t t)
- {
- extern struct timezone sys_tz;
- return t - sys_tz.tz_minuteswest * 60 - s->s_hpfs_timeshift;
- }
- /*
- * conv= options
- */
- #define CONV_BINARY 0 /* no conversion */
- #define CONV_TEXT 1 /* crlf->newline */
- #define CONV_AUTO 2 /* decide based on file contents */
- /* Four 512-byte buffers and the 2k block obtained by concatenating them */
- struct quad_buffer_head {
- struct buffer_head *bh[4];
- void *data;
- };
- /* The b-tree down pointer from a dir entry */
- extern inline dnode_secno de_down_pointer (struct hpfs_dirent *de)
- {
- CHKCOND(de->down,("HPFS: de_down_pointer: !de->downn"));
- return *(dnode_secno *) ((void *) de + de->length - 4);
- }
- /* The first dir entry in a dnode */
- extern inline struct hpfs_dirent *dnode_first_de (struct dnode *dnode)
- {
- return (void *) dnode->dirent;
- }
- /* The end+1 of the dir entries */
- extern inline struct hpfs_dirent *dnode_end_de (struct dnode *dnode)
- {
- CHKCOND(dnode->first_free>=0x14 && dnode->first_free<=0xa00,("HPFS: dnode_end_de: dnode->first_free = %dn",(int)dnode->first_free));
- return (void *) dnode + dnode->first_free;
- }
- /* The dir entry after dir entry de */
- extern inline struct hpfs_dirent *de_next_de (struct hpfs_dirent *de)
- {
- CHKCOND(de->length>=0x20 && de->length<0x800,("HPFS: de_next_de: de->length = %dn",(int)de->length));
- return (void *) de + de->length;
- }
- extern inline struct extended_attribute *fnode_ea(struct fnode *fnode)
- {
- return (struct extended_attribute *)((char *)fnode + fnode->ea_offs);
- }
- extern inline struct extended_attribute *fnode_end_ea(struct fnode *fnode)
- {
- return (struct extended_attribute *)((char *)fnode + fnode->ea_offs + fnode->ea_size_s);
- }
- extern inline struct extended_attribute *next_ea(struct extended_attribute *ea)
- {
- return (struct extended_attribute *)((char *)ea + 5 + ea->namelen + ea->valuelen);
- }
- extern inline secno ea_sec(struct extended_attribute *ea)
- {
- return *(secno *)((char *)ea + 9 + ea->namelen);
- }
- extern inline secno ea_len(struct extended_attribute *ea)
- {
- return *(secno *)((char *)ea + 5 + ea->namelen);
- }
- extern inline char *ea_data(struct extended_attribute *ea)
- {
- return (char *)((char *)ea + 5 + ea->namelen);
- }
- extern inline unsigned de_size(int namelen, secno down_ptr)
- {
- return ((0x1f + namelen + 3) & ~3) + (down_ptr ? 4 : 0);
- }
- extern inline void copy_de(struct hpfs_dirent *dst, struct hpfs_dirent *src)
- {
- int a = dst->down;
- int n = dst->not_8x3;
- if (!dst || !src) return;
- memcpy((char *)dst + 2, (char *)src + 2, 28);
- dst->down = a;
- dst->not_8x3 = n;
- }
- extern inline unsigned tstbits(unsigned *bmp, unsigned b, unsigned n)
- {
- int i;
- if ((b >= 0x4000) || (b + n - 1 >= 0x4000)) return n;
- if (!((bmp[(b & 0x3fff) >> 5] >> (b & 0x1f)) & 1)) return 1;
- for (i = 1; i < n; i++)
- if (/*b+i < 0x4000 &&*/ !((bmp[((b+i) & 0x3fff) >> 5] >> ((b+i) & 0x1f)) & 1))
- return i + 1;
- return 0;
- }
- /* alloc.c */
- int hpfs_chk_sectors(struct super_block *, secno, int, char *);
- secno hpfs_alloc_sector(struct super_block *, secno, unsigned, int, int);
- int hpfs_alloc_if_possible_nolock(struct super_block *, secno);
- int hpfs_alloc_if_possible(struct super_block *, secno);
- void hpfs_free_sectors(struct super_block *, secno, unsigned);
- int hpfs_check_free_dnodes(struct super_block *, int);
- void hpfs_free_dnode(struct super_block *, secno);
- struct dnode *hpfs_alloc_dnode(struct super_block *, secno, dnode_secno *, struct quad_buffer_head *, int);
- struct fnode *hpfs_alloc_fnode(struct super_block *, secno, fnode_secno *, struct buffer_head **);
- struct anode *hpfs_alloc_anode(struct super_block *, secno, anode_secno *, struct buffer_head **);
- /* anode.c */
- secno hpfs_bplus_lookup(struct super_block *, struct inode *, struct bplus_header *, unsigned, struct buffer_head *);
- secno hpfs_add_sector_to_btree(struct super_block *, secno, int, unsigned);
- void hpfs_remove_btree(struct super_block *, struct bplus_header *);
- int hpfs_ea_read(struct super_block *, secno, int, unsigned, unsigned, char *);
- int hpfs_ea_write(struct super_block *, secno, int, unsigned, unsigned, char *);
- void hpfs_ea_remove(struct super_block *, secno, int, unsigned);
- void hpfs_truncate_btree(struct super_block *, secno, int, unsigned);
- void hpfs_remove_fnode(struct super_block *, fnode_secno fno);
- /* buffer.c */
- void hpfs_lock_creation(struct super_block *);
- void hpfs_unlock_creation(struct super_block *);
- void hpfs_lock_iget(struct super_block *, int);
- void hpfs_unlock_iget(struct super_block *);
- void hpfs_lock_inode(struct inode *);
- void hpfs_unlock_inode(struct inode *);
- void hpfs_lock_2inodes(struct inode *, struct inode *);
- void hpfs_unlock_2inodes(struct inode *, struct inode *);
- void hpfs_lock_3inodes(struct inode *, struct inode *, struct inode *);
- void hpfs_unlock_3inodes(struct inode *, struct inode *, struct inode *);
- void *hpfs_map_sector(struct super_block *, unsigned, struct buffer_head **, int);
- void *hpfs_get_sector(struct super_block *, unsigned, struct buffer_head **);
- void *hpfs_map_4sectors(struct super_block *, unsigned, struct quad_buffer_head *, int);
- void *hpfs_get_4sectors(struct super_block *, unsigned, struct quad_buffer_head *);
- void hpfs_brelse4(struct quad_buffer_head *);
- void hpfs_mark_4buffers_dirty(struct quad_buffer_head *);
- /* dentry.c */
- void hpfs_set_dentry_operations(struct dentry *);
- /* dir.c */
- int hpfs_dir_release(struct inode *, struct file *);
- loff_t hpfs_dir_lseek(struct file *, loff_t, int);
- int hpfs_readdir(struct file *, void *, filldir_t);
- struct dentry *hpfs_lookup(struct inode *, struct dentry *);
- /* dnode.c */
- void hpfs_add_pos(struct inode *, loff_t *);
- void hpfs_del_pos(struct inode *, loff_t *);
- struct hpfs_dirent *hpfs_add_de(struct super_block *, struct dnode *, unsigned char *, unsigned, secno);
- void hpfs_delete_de(struct super_block *, struct dnode *, struct hpfs_dirent *);
- int hpfs_add_to_dnode(struct inode *, dnode_secno, unsigned char *, unsigned, struct hpfs_dirent *, dnode_secno);
- int hpfs_add_dirent(struct inode *, unsigned char *, unsigned, struct hpfs_dirent *, int);
- int hpfs_remove_dirent(struct inode *, dnode_secno, struct hpfs_dirent *, struct quad_buffer_head *, int);
- void hpfs_count_dnodes(struct super_block *, dnode_secno, int *, int *, int *);
- dnode_secno hpfs_de_as_down_as_possible(struct super_block *, dnode_secno dno);
- struct hpfs_dirent *map_pos_dirent(struct inode *, loff_t *, struct quad_buffer_head *);
- struct hpfs_dirent *map_dirent(struct inode *, dnode_secno, char *, unsigned, dnode_secno *, struct quad_buffer_head *);
- void hpfs_remove_dtree(struct super_block *, dnode_secno);
- struct hpfs_dirent *map_fnode_dirent(struct super_block *, fnode_secno, struct fnode *, struct quad_buffer_head *);
- /* ea.c */
- void hpfs_ea_ext_remove(struct super_block *, secno, int, unsigned);
- int hpfs_read_ea(struct super_block *, struct fnode *, char *, char *, int);
- char *hpfs_get_ea(struct super_block *, struct fnode *, char *, int *);
- void hpfs_set_ea(struct inode *, struct fnode *, char *, char *, int);
- /* file.c */
- int hpfs_file_release(struct inode *, struct file *);
- int hpfs_open(struct inode *, struct file *);
- int hpfs_file_fsync(struct file *, struct dentry *, int);
- secno hpfs_bmap(struct inode *, unsigned);
- void hpfs_truncate(struct inode *);
- int hpfs_get_block(struct inode *inode, long iblock, struct buffer_head *bh_result, int create);
- ssize_t hpfs_file_write(struct file *file, const char *buf, size_t count, loff_t *ppos);
- /* inode.c */
- void hpfs_read_inode(struct inode *);
- void hpfs_write_inode_ea(struct inode *, struct fnode *);
- void hpfs_write_inode(struct inode *);
- void hpfs_write_inode_nolock(struct inode *);
- int hpfs_notify_change(struct dentry *, struct iattr *);
- void hpfs_write_if_changed(struct inode *);
- void hpfs_delete_inode(struct inode *);
- /* map.c */
- unsigned *hpfs_map_dnode_bitmap(struct super_block *, struct quad_buffer_head *);
- unsigned *hpfs_map_bitmap(struct super_block *, unsigned, struct quad_buffer_head *, char *);
- char *hpfs_load_code_page(struct super_block *, secno);
- secno *hpfs_load_bitmap_directory(struct super_block *, secno bmp);
- struct fnode *hpfs_map_fnode(struct super_block *s, ino_t, struct buffer_head **);
- struct anode *hpfs_map_anode(struct super_block *s, anode_secno, struct buffer_head **);
- struct dnode *hpfs_map_dnode(struct super_block *s, dnode_secno, struct quad_buffer_head *);
- dnode_secno hpfs_fnode_dno(struct super_block *s, ino_t ino);
- /* name.c */
- unsigned char hpfs_upcase(unsigned char *, unsigned char);
- int hpfs_chk_name(unsigned char *, unsigned *);
- char *hpfs_translate_name(struct super_block *, unsigned char *, unsigned, int, int);
- int hpfs_compare_names(struct super_block *, unsigned char *, unsigned, unsigned char *, unsigned, int);
- int hpfs_is_name_long(unsigned char *, unsigned);
- void hpfs_adjust_length(unsigned char *, unsigned *);
- void hpfs_decide_conv(struct inode *, unsigned char *, unsigned);
- /* namei.c */
- int hpfs_mkdir(struct inode *, struct dentry *, int);
- int hpfs_create(struct inode *, struct dentry *, int);
- int hpfs_mknod(struct inode *, struct dentry *, int, int);
- int hpfs_symlink(struct inode *, struct dentry *, const char *);
- int hpfs_unlink(struct inode *, struct dentry *);
- int hpfs_rmdir(struct inode *, struct dentry *);
- int hpfs_symlink_readpage(struct file *, struct page *);
- int hpfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *);
- /* super.c */
- void hpfs_error(struct super_block *, char *, ...);
- int hpfs_stop_cycles(struct super_block *, int, int *, int *, char *);
- int hpfs_remount_fs(struct super_block *, int *, char *);
- void hpfs_put_super(struct super_block *);
- unsigned hpfs_count_one_bitmap(struct super_block *, secno);
- int hpfs_statfs(struct super_block *, struct statfs *);
- extern struct address_space_operations hpfs_aops;