361 lines
12 KiB
C
361 lines
12 KiB
C
/*
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* linux/fs/hpfs/hpfs_fn.h
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*
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* Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999
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*
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* function headers
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*/
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//#define DBG
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//#define DEBUG_LOCKS
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#include <linux/mutex.h>
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#include <linux/pagemap.h>
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#include <linux/buffer_head.h>
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#include <linux/slab.h>
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#include <asm/unaligned.h>
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#include "hpfs.h"
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#define EIOERROR EIO
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#define EFSERROR EPERM
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#define EMEMERROR ENOMEM
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#define ANODE_ALLOC_FWD 512
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#define FNODE_ALLOC_FWD 0
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#define ALLOC_FWD_MIN 16
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#define ALLOC_FWD_MAX 128
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#define ALLOC_M 1
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#define FNODE_RD_AHEAD 16
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#define ANODE_RD_AHEAD 16
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#define DNODE_RD_AHEAD 4
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#define FREE_DNODES_ADD 58
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#define FREE_DNODES_DEL 29
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#define CHKCOND(x,y) if (!(x)) printk y
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#ifdef DBG
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#define PRINTK(x) printk x
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#else
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#undef PRINTK
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#define PRINTK(x)
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#endif
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struct hpfs_inode_info {
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loff_t mmu_private;
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ino_t i_parent_dir; /* (directories) gives fnode of parent dir */
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unsigned i_dno; /* (directories) root dnode */
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unsigned i_dpos; /* (directories) temp for readdir */
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unsigned i_dsubdno; /* (directories) temp for readdir */
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unsigned i_file_sec; /* (files) minimalist cache of alloc info */
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unsigned i_disk_sec; /* (files) minimalist cache of alloc info */
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unsigned i_n_secs; /* (files) minimalist cache of alloc info */
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unsigned i_ea_size; /* size of extended attributes */
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unsigned i_ea_mode : 1; /* file's permission is stored in ea */
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unsigned i_ea_uid : 1; /* file's uid is stored in ea */
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unsigned i_ea_gid : 1; /* file's gid is stored in ea */
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unsigned i_dirty : 1;
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loff_t **i_rddir_off;
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struct inode vfs_inode;
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};
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struct hpfs_sb_info {
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struct mutex hpfs_mutex; /* global hpfs lock */
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ino_t sb_root; /* inode number of root dir */
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unsigned sb_fs_size; /* file system size, sectors */
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unsigned sb_bitmaps; /* sector number of bitmap list */
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unsigned sb_dirband_start; /* directory band start sector */
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unsigned sb_dirband_size; /* directory band size, dnodes */
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unsigned sb_dmap; /* sector number of dnode bit map */
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unsigned sb_n_free; /* free blocks for statfs, or -1 */
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unsigned sb_n_free_dnodes; /* free dnodes for statfs, or -1 */
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uid_t sb_uid; /* uid from mount options */
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gid_t sb_gid; /* gid from mount options */
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umode_t sb_mode; /* mode from mount options */
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unsigned sb_eas : 2; /* eas: 0-ignore, 1-ro, 2-rw */
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unsigned sb_err : 2; /* on errs: 0-cont, 1-ro, 2-panic */
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unsigned sb_chk : 2; /* checks: 0-no, 1-normal, 2-strict */
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unsigned sb_lowercase : 1; /* downcase filenames hackery */
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unsigned sb_was_error : 1; /* there was an error, set dirty flag */
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unsigned sb_chkdsk : 2; /* chkdsk: 0-no, 1-on errs, 2-allways */
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unsigned char *sb_cp_table; /* code page tables: */
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/* 128 bytes uppercasing table & */
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/* 128 bytes lowercasing table */
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unsigned *sb_bmp_dir; /* main bitmap directory */
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unsigned sb_c_bitmap; /* current bitmap */
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unsigned sb_max_fwd_alloc; /* max forwad allocation */
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int sb_timeshift;
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};
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/* Four 512-byte buffers and the 2k block obtained by concatenating them */
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struct quad_buffer_head {
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struct buffer_head *bh[4];
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void *data;
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};
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/* The b-tree down pointer from a dir entry */
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static inline dnode_secno de_down_pointer (struct hpfs_dirent *de)
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{
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CHKCOND(de->down,("HPFS: de_down_pointer: !de->down\n"));
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return le32_to_cpu(*(dnode_secno *) ((void *) de + le16_to_cpu(de->length) - 4));
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}
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/* The first dir entry in a dnode */
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static inline struct hpfs_dirent *dnode_first_de (struct dnode *dnode)
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{
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return (void *) dnode->dirent;
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}
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/* The end+1 of the dir entries */
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static inline struct hpfs_dirent *dnode_end_de (struct dnode *dnode)
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{
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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)));
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return (void *) dnode + le32_to_cpu(dnode->first_free);
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}
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/* The dir entry after dir entry de */
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static inline struct hpfs_dirent *de_next_de (struct hpfs_dirent *de)
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{
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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)));
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return (void *) de + le16_to_cpu(de->length);
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}
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static inline struct extended_attribute *fnode_ea(struct fnode *fnode)
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{
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return (struct extended_attribute *)((char *)fnode + le16_to_cpu(fnode->ea_offs) + le16_to_cpu(fnode->acl_size_s));
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}
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static inline struct extended_attribute *fnode_end_ea(struct fnode *fnode)
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{
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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));
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}
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static unsigned ea_valuelen(struct extended_attribute *ea)
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{
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return ea->valuelen_lo + 256 * ea->valuelen_hi;
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}
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static inline struct extended_attribute *next_ea(struct extended_attribute *ea)
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{
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return (struct extended_attribute *)((char *)ea + 5 + ea->namelen + ea_valuelen(ea));
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}
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static inline secno ea_sec(struct extended_attribute *ea)
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{
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return le32_to_cpu(get_unaligned((secno *)((char *)ea + 9 + ea->namelen)));
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}
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static inline secno ea_len(struct extended_attribute *ea)
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{
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return le32_to_cpu(get_unaligned((secno *)((char *)ea + 5 + ea->namelen)));
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}
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static inline char *ea_data(struct extended_attribute *ea)
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{
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return (char *)((char *)ea + 5 + ea->namelen);
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}
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static inline unsigned de_size(int namelen, secno down_ptr)
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{
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return ((0x1f + namelen + 3) & ~3) + (down_ptr ? 4 : 0);
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}
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static inline void copy_de(struct hpfs_dirent *dst, struct hpfs_dirent *src)
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{
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int a;
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int n;
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if (!dst || !src) return;
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a = dst->down;
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n = dst->not_8x3;
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memcpy((char *)dst + 2, (char *)src + 2, 28);
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dst->down = a;
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dst->not_8x3 = n;
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}
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static inline unsigned tstbits(u32 *bmp, unsigned b, unsigned n)
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{
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int i;
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if ((b >= 0x4000) || (b + n - 1 >= 0x4000)) return n;
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if (!((le32_to_cpu(bmp[(b & 0x3fff) >> 5]) >> (b & 0x1f)) & 1)) return 1;
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for (i = 1; i < n; i++)
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if (!((le32_to_cpu(bmp[((b+i) & 0x3fff) >> 5]) >> ((b+i) & 0x1f)) & 1))
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return i + 1;
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return 0;
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}
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/* alloc.c */
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int hpfs_chk_sectors(struct super_block *, secno, int, char *);
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secno hpfs_alloc_sector(struct super_block *, secno, unsigned, int);
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int hpfs_alloc_if_possible(struct super_block *, secno);
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void hpfs_free_sectors(struct super_block *, secno, unsigned);
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int hpfs_check_free_dnodes(struct super_block *, int);
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void hpfs_free_dnode(struct super_block *, secno);
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struct dnode *hpfs_alloc_dnode(struct super_block *, secno, dnode_secno *, struct quad_buffer_head *);
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struct fnode *hpfs_alloc_fnode(struct super_block *, secno, fnode_secno *, struct buffer_head **);
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struct anode *hpfs_alloc_anode(struct super_block *, secno, anode_secno *, struct buffer_head **);
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/* anode.c */
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secno hpfs_bplus_lookup(struct super_block *, struct inode *, struct bplus_header *, unsigned, struct buffer_head *);
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secno hpfs_add_sector_to_btree(struct super_block *, secno, int, unsigned);
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void hpfs_remove_btree(struct super_block *, struct bplus_header *);
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int hpfs_ea_read(struct super_block *, secno, int, unsigned, unsigned, char *);
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int hpfs_ea_write(struct super_block *, secno, int, unsigned, unsigned, const char *);
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void hpfs_ea_remove(struct super_block *, secno, int, unsigned);
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void hpfs_truncate_btree(struct super_block *, secno, int, unsigned);
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void hpfs_remove_fnode(struct super_block *, fnode_secno fno);
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/* buffer.c */
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void *hpfs_map_sector(struct super_block *, unsigned, struct buffer_head **, int);
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void *hpfs_get_sector(struct super_block *, unsigned, struct buffer_head **);
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void *hpfs_map_4sectors(struct super_block *, unsigned, struct quad_buffer_head *, int);
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void *hpfs_get_4sectors(struct super_block *, unsigned, struct quad_buffer_head *);
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void hpfs_brelse4(struct quad_buffer_head *);
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void hpfs_mark_4buffers_dirty(struct quad_buffer_head *);
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/* dentry.c */
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extern const struct dentry_operations hpfs_dentry_operations;
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/* dir.c */
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struct dentry *hpfs_lookup(struct inode *, struct dentry *, struct nameidata *);
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extern const struct file_operations hpfs_dir_ops;
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/* dnode.c */
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void hpfs_add_pos(struct inode *, loff_t *);
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void hpfs_del_pos(struct inode *, loff_t *);
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struct hpfs_dirent *hpfs_add_de(struct super_block *, struct dnode *,
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const unsigned char *, unsigned, secno);
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int hpfs_add_dirent(struct inode *, const unsigned char *, unsigned,
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struct hpfs_dirent *);
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int hpfs_remove_dirent(struct inode *, dnode_secno, struct hpfs_dirent *, struct quad_buffer_head *, int);
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void hpfs_count_dnodes(struct super_block *, dnode_secno, int *, int *, int *);
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dnode_secno hpfs_de_as_down_as_possible(struct super_block *, dnode_secno dno);
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struct hpfs_dirent *map_pos_dirent(struct inode *, loff_t *, struct quad_buffer_head *);
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struct hpfs_dirent *map_dirent(struct inode *, dnode_secno,
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const unsigned char *, unsigned, dnode_secno *,
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struct quad_buffer_head *);
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void hpfs_remove_dtree(struct super_block *, dnode_secno);
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struct hpfs_dirent *map_fnode_dirent(struct super_block *, fnode_secno, struct fnode *, struct quad_buffer_head *);
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/* ea.c */
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void hpfs_ea_ext_remove(struct super_block *, secno, int, unsigned);
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int hpfs_read_ea(struct super_block *, struct fnode *, char *, char *, int);
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char *hpfs_get_ea(struct super_block *, struct fnode *, char *, int *);
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void hpfs_set_ea(struct inode *, struct fnode *, const char *,
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const char *, int);
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/* file.c */
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int hpfs_file_fsync(struct file *, loff_t, loff_t, int);
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extern const struct file_operations hpfs_file_ops;
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extern const struct inode_operations hpfs_file_iops;
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extern const struct address_space_operations hpfs_aops;
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/* inode.c */
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void hpfs_init_inode(struct inode *);
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void hpfs_read_inode(struct inode *);
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void hpfs_write_inode(struct inode *);
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void hpfs_write_inode_nolock(struct inode *);
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int hpfs_setattr(struct dentry *, struct iattr *);
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void hpfs_write_if_changed(struct inode *);
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void hpfs_evict_inode(struct inode *);
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/* map.c */
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unsigned *hpfs_map_dnode_bitmap(struct super_block *, struct quad_buffer_head *);
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unsigned *hpfs_map_bitmap(struct super_block *, unsigned, struct quad_buffer_head *, char *);
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unsigned char *hpfs_load_code_page(struct super_block *, secno);
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secno *hpfs_load_bitmap_directory(struct super_block *, secno bmp);
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struct fnode *hpfs_map_fnode(struct super_block *s, ino_t, struct buffer_head **);
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struct anode *hpfs_map_anode(struct super_block *s, anode_secno, struct buffer_head **);
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struct dnode *hpfs_map_dnode(struct super_block *s, dnode_secno, struct quad_buffer_head *);
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dnode_secno hpfs_fnode_dno(struct super_block *s, ino_t ino);
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/* name.c */
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unsigned char hpfs_upcase(unsigned char *, unsigned char);
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int hpfs_chk_name(const unsigned char *, unsigned *);
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unsigned char *hpfs_translate_name(struct super_block *, unsigned char *, unsigned, int, int);
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int hpfs_compare_names(struct super_block *, const unsigned char *, unsigned,
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const unsigned char *, unsigned, int);
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int hpfs_is_name_long(const unsigned char *, unsigned);
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void hpfs_adjust_length(const unsigned char *, unsigned *);
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/* namei.c */
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extern const struct inode_operations hpfs_dir_iops;
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extern const struct address_space_operations hpfs_symlink_aops;
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static inline struct hpfs_inode_info *hpfs_i(struct inode *inode)
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{
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return list_entry(inode, struct hpfs_inode_info, vfs_inode);
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}
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static inline struct hpfs_sb_info *hpfs_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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/* super.c */
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void hpfs_error(struct super_block *, const char *, ...)
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__attribute__((format (printf, 2, 3)));
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int hpfs_stop_cycles(struct super_block *, int, int *, int *, char *);
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unsigned hpfs_count_one_bitmap(struct super_block *, secno);
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/*
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* local time (HPFS) to GMT (Unix)
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*/
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static inline time_t local_to_gmt(struct super_block *s, time32_t t)
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{
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extern struct timezone sys_tz;
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return t + sys_tz.tz_minuteswest * 60 + hpfs_sb(s)->sb_timeshift;
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}
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static inline time32_t gmt_to_local(struct super_block *s, time_t t)
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{
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extern struct timezone sys_tz;
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return t - sys_tz.tz_minuteswest * 60 - hpfs_sb(s)->sb_timeshift;
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}
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/*
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* Locking:
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*
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* hpfs_lock() locks the whole filesystem. It must be taken
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* on any method called by the VFS.
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*
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* We don't do any per-file locking anymore, it is hard to
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* review and HPFS is not performance-sensitive anyway.
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*/
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static inline void hpfs_lock(struct super_block *s)
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{
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struct hpfs_sb_info *sbi = hpfs_sb(s);
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mutex_lock(&sbi->hpfs_mutex);
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}
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static inline void hpfs_unlock(struct super_block *s)
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{
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struct hpfs_sb_info *sbi = hpfs_sb(s);
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mutex_unlock(&sbi->hpfs_mutex);
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}
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static inline void hpfs_lock_assert(struct super_block *s)
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{
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struct hpfs_sb_info *sbi = hpfs_sb(s);
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WARN_ON(!mutex_is_locked(&sbi->hpfs_mutex));
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}
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