| /* |
| * 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/mutex.h> |
| #include <linux/pagemap.h> |
| #include <linux/buffer_head.h> |
| #include <linux/slab.h> |
| #include <asm/unaligned.h> |
| |
| #include "hpfs.h" |
| |
| #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 |
| |
| struct hpfs_inode_info { |
| loff_t mmu_private; |
| ino_t i_parent_dir; /* (directories) gives fnode of parent dir */ |
| unsigned i_dno; /* (directories) root dnode */ |
| unsigned i_dpos; /* (directories) temp for readdir */ |
| unsigned i_dsubdno; /* (directories) temp for readdir */ |
| unsigned i_file_sec; /* (files) minimalist cache of alloc info */ |
| unsigned i_disk_sec; /* (files) minimalist cache of alloc info */ |
| unsigned i_n_secs; /* (files) minimalist cache of alloc info */ |
| unsigned i_ea_size; /* size of extended attributes */ |
| unsigned i_ea_mode : 1; /* file's permission is stored in ea */ |
| unsigned i_ea_uid : 1; /* file's uid is stored in ea */ |
| unsigned i_ea_gid : 1; /* file's gid is stored in ea */ |
| unsigned i_dirty : 1; |
| loff_t **i_rddir_off; |
| struct inode vfs_inode; |
| }; |
| |
| struct hpfs_sb_info { |
| struct mutex hpfs_mutex; /* global hpfs lock */ |
| ino_t sb_root; /* inode number of root dir */ |
| unsigned sb_fs_size; /* file system size, sectors */ |
| unsigned sb_bitmaps; /* sector number of bitmap list */ |
| unsigned sb_dirband_start; /* directory band start sector */ |
| unsigned sb_dirband_size; /* directory band size, dnodes */ |
| unsigned sb_dmap; /* sector number of dnode bit map */ |
| unsigned sb_n_free; /* free blocks for statfs, or -1 */ |
| unsigned sb_n_free_dnodes; /* free dnodes for statfs, or -1 */ |
| uid_t sb_uid; /* uid from mount options */ |
| gid_t sb_gid; /* gid from mount options */ |
| umode_t sb_mode; /* mode from mount options */ |
| unsigned sb_eas : 2; /* eas: 0-ignore, 1-ro, 2-rw */ |
| unsigned sb_err : 2; /* on errs: 0-cont, 1-ro, 2-panic */ |
| unsigned sb_chk : 2; /* checks: 0-no, 1-normal, 2-strict */ |
| unsigned sb_lowercase : 1; /* downcase filenames hackery */ |
| unsigned sb_was_error : 1; /* there was an error, set dirty flag */ |
| unsigned sb_chkdsk : 2; /* chkdsk: 0-no, 1-on errs, 2-allways */ |
| unsigned char *sb_cp_table; /* code page tables: */ |
| /* 128 bytes uppercasing table & */ |
| /* 128 bytes lowercasing table */ |
| unsigned *sb_bmp_dir; /* main bitmap directory */ |
| unsigned sb_c_bitmap; /* current bitmap */ |
| unsigned sb_max_fwd_alloc; /* max forwad allocation */ |
| int sb_timeshift; |
| }; |
| |
| /* 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 */ |
| |
| static inline dnode_secno de_down_pointer (struct hpfs_dirent *de) |
| { |
| CHKCOND(de->down,("HPFS: de_down_pointer: !de->down\n")); |
| return le32_to_cpu(*(dnode_secno *) ((void *) de + le16_to_cpu(de->length) - 4)); |
| } |
| |
| /* The first dir entry in a dnode */ |
| |
| static inline struct hpfs_dirent *dnode_first_de (struct dnode *dnode) |
| { |
| return (void *) dnode->dirent; |
| } |
| |
| /* The end+1 of the dir entries */ |
| |
| static inline struct hpfs_dirent *dnode_end_de (struct dnode *dnode) |
| { |
| CHKCOND(le32_to_cpu(dnode->first_free)>=0x14 && le32_to_cpu(dnode->first_free)<=0xa00,("HPFS: dnode_end_de: dnode->first_free = %x\n",(unsigned)le32_to_cpu(dnode->first_free))); |
| return (void *) dnode + le32_to_cpu(dnode->first_free); |
| } |
| |
| /* The dir entry after dir entry de */ |
| |
| static inline struct hpfs_dirent *de_next_de (struct hpfs_dirent *de) |
| { |
| CHKCOND(le16_to_cpu(de->length)>=0x20 && le16_to_cpu(de->length)<0x800,("HPFS: de_next_de: de->length = %x\n",(unsigned)le16_to_cpu(de->length))); |
| return (void *) de + le16_to_cpu(de->length); |
| } |
| |
| static inline struct extended_attribute *fnode_ea(struct fnode *fnode) |
| { |
| return (struct extended_attribute *)((char *)fnode + le16_to_cpu(fnode->ea_offs) + le16_to_cpu(fnode->acl_size_s)); |
| } |
| |
| static inline struct extended_attribute *fnode_end_ea(struct fnode *fnode) |
| { |
| return (struct extended_attribute *)((char *)fnode + le16_to_cpu(fnode->ea_offs) + le16_to_cpu(fnode->acl_size_s) + le16_to_cpu(fnode->ea_size_s)); |
| } |
| |
| static unsigned ea_valuelen(struct extended_attribute *ea) |
| { |
| return ea->valuelen_lo + 256 * ea->valuelen_hi; |
| } |
| |
| static inline struct extended_attribute *next_ea(struct extended_attribute *ea) |
| { |
| return (struct extended_attribute *)((char *)ea + 5 + ea->namelen + ea_valuelen(ea)); |
| } |
| |
| static inline secno ea_sec(struct extended_attribute *ea) |
| { |
| return le32_to_cpu(get_unaligned((secno *)((char *)ea + 9 + ea->namelen))); |
| } |
| |
| static inline secno ea_len(struct extended_attribute *ea) |
| { |
| return le32_to_cpu(get_unaligned((secno *)((char *)ea + 5 + ea->namelen))); |
| } |
| |
| static inline char *ea_data(struct extended_attribute *ea) |
| { |
| return (char *)((char *)ea + 5 + ea->namelen); |
| } |
| |
| static inline unsigned de_size(int namelen, secno down_ptr) |
| { |
| return ((0x1f + namelen + 3) & ~3) + (down_ptr ? 4 : 0); |
| } |
| |
| static inline void copy_de(struct hpfs_dirent *dst, struct hpfs_dirent *src) |
| { |
| int a; |
| int n; |
| if (!dst || !src) return; |
| a = dst->down; |
| n = dst->not_8x3; |
| memcpy((char *)dst + 2, (char *)src + 2, 28); |
| dst->down = a; |
| dst->not_8x3 = n; |
| } |
| |
| static inline unsigned tstbits(__le32 *bmp, unsigned b, unsigned n) |
| { |
| int i; |
| if ((b >= 0x4000) || (b + n - 1 >= 0x4000)) return n; |
| if (!((le32_to_cpu(bmp[(b & 0x3fff) >> 5]) >> (b & 0x1f)) & 1)) return 1; |
| for (i = 1; i < n; i++) |
| if (!((le32_to_cpu(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 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 *); |
| 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, const 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_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 */ |
| |
| extern const struct dentry_operations hpfs_dentry_operations; |
| |
| /* dir.c */ |
| |
| struct dentry *hpfs_lookup(struct inode *, struct dentry *, struct nameidata *); |
| extern const struct file_operations hpfs_dir_ops; |
| |
| /* 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 *, |
| const unsigned char *, unsigned, secno); |
| int hpfs_add_dirent(struct inode *, const unsigned char *, unsigned, |
| struct hpfs_dirent *); |
| 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, |
| const unsigned 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 *, const char *, |
| const char *, int); |
| |
| /* file.c */ |
| |
| int hpfs_file_fsync(struct file *, loff_t, loff_t, int); |
| extern const struct file_operations hpfs_file_ops; |
| extern const struct inode_operations hpfs_file_iops; |
| extern const struct address_space_operations hpfs_aops; |
| |
| /* inode.c */ |
| |
| void hpfs_init_inode(struct inode *); |
| void hpfs_read_inode(struct inode *); |
| void hpfs_write_inode(struct inode *); |
| void hpfs_write_inode_nolock(struct inode *); |
| int hpfs_setattr(struct dentry *, struct iattr *); |
| void hpfs_write_if_changed(struct inode *); |
| void hpfs_evict_inode(struct inode *); |
| |
| /* map.c */ |
| |
| __le32 *hpfs_map_dnode_bitmap(struct super_block *, struct quad_buffer_head *); |
| __le32 *hpfs_map_bitmap(struct super_block *, unsigned, struct quad_buffer_head *, char *); |
| unsigned 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(const unsigned char *, unsigned *); |
| unsigned char *hpfs_translate_name(struct super_block *, unsigned char *, unsigned, int, int); |
| int hpfs_compare_names(struct super_block *, const unsigned char *, unsigned, |
| const unsigned char *, unsigned, int); |
| int hpfs_is_name_long(const unsigned char *, unsigned); |
| void hpfs_adjust_length(const unsigned char *, unsigned *); |
| |
| /* namei.c */ |
| |
| extern const struct inode_operations hpfs_dir_iops; |
| extern const struct address_space_operations hpfs_symlink_aops; |
| |
| static inline struct hpfs_inode_info *hpfs_i(struct inode *inode) |
| { |
| return list_entry(inode, struct hpfs_inode_info, vfs_inode); |
| } |
| |
| static inline struct hpfs_sb_info *hpfs_sb(struct super_block *sb) |
| { |
| return sb->s_fs_info; |
| } |
| |
| /* super.c */ |
| |
| __printf(2, 3) |
| void hpfs_error(struct super_block *, const char *, ...); |
| int hpfs_stop_cycles(struct super_block *, int, int *, int *, char *); |
| unsigned hpfs_count_one_bitmap(struct super_block *, secno); |
| |
| /* |
| * local time (HPFS) to GMT (Unix) |
| */ |
| |
| static inline time_t local_to_gmt(struct super_block *s, time32_t t) |
| { |
| extern struct timezone sys_tz; |
| return t + sys_tz.tz_minuteswest * 60 + hpfs_sb(s)->sb_timeshift; |
| } |
| |
| static inline time32_t gmt_to_local(struct super_block *s, time_t t) |
| { |
| extern struct timezone sys_tz; |
| return t - sys_tz.tz_minuteswest * 60 - hpfs_sb(s)->sb_timeshift; |
| } |
| |
| /* |
| * Locking: |
| * |
| * hpfs_lock() locks the whole filesystem. It must be taken |
| * on any method called by the VFS. |
| * |
| * We don't do any per-file locking anymore, it is hard to |
| * review and HPFS is not performance-sensitive anyway. |
| */ |
| static inline void hpfs_lock(struct super_block *s) |
| { |
| struct hpfs_sb_info *sbi = hpfs_sb(s); |
| mutex_lock(&sbi->hpfs_mutex); |
| } |
| |
| static inline void hpfs_unlock(struct super_block *s) |
| { |
| struct hpfs_sb_info *sbi = hpfs_sb(s); |
| mutex_unlock(&sbi->hpfs_mutex); |
| } |
| |
| static inline void hpfs_lock_assert(struct super_block *s) |
| { |
| struct hpfs_sb_info *sbi = hpfs_sb(s); |
| WARN_ON(!mutex_is_locked(&sbi->hpfs_mutex)); |
| } |