linux/fs/hpfs/hpfs_fn.h
Arnd Bergmann 9a311b96c3 hpfs: remove the BKL
This removes the BKL in hpfs in a rather awful
way, by making the code only work on uniprocessor
systems without kernel preemption, as suggested
by Andi Kleen.

The HPFS code probably has close to zero remaining
users on current kernels, all archeological uses of
the file system can probably be done with the significant
restrictions.

The hpfs_lock/hpfs_unlock functions are left in the
code, sincen Mikulas has indicated that he is still
interested in fixing it in a better way.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Andi Kleen <ak@linux.intel.com>
Cc: Mikulas Patocka <mikulas@artax.karlin.mff.cuni.cz>
Cc: linux-fsdevel@vger.kernel.org
2011-03-02 22:27:36 +01:00

367 lines
12 KiB
C

/*
* 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 "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_conv : 2; /* (files) crlf->newline hackery */
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;
struct mutex i_mutex;
struct mutex i_parent_mutex;
loff_t **i_rddir_off;
struct inode vfs_inode;
};
struct hpfs_sb_info {
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_conv : 2; /* crlf->newline hackery */
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 */
struct mutex hpfs_creation_de; /* when creating dirents, nobody else
can alloc blocks */
/*unsigned sb_mounting : 1;*/
int sb_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 */
static inline dnode_secno de_down_pointer (struct hpfs_dirent *de)
{
CHKCOND(de->down,("HPFS: de_down_pointer: !de->down\n"));
return *(dnode_secno *) ((void *) de + 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(dnode->first_free>=0x14 && dnode->first_free<=0xa00,("HPFS: dnode_end_de: dnode->first_free = %d\n",(int)dnode->first_free));
return (void *) dnode + dnode->first_free;
}
/* The dir entry after dir entry de */
static inline struct hpfs_dirent *de_next_de (struct hpfs_dirent *de)
{
CHKCOND(de->length>=0x20 && de->length<0x800,("HPFS: de_next_de: de->length = %d\n",(int)de->length));
return (void *) de + de->length;
}
static inline struct extended_attribute *fnode_ea(struct fnode *fnode)
{
return (struct extended_attribute *)((char *)fnode + fnode->ea_offs + fnode->acl_size_s);
}
static inline struct extended_attribute *fnode_end_ea(struct fnode *fnode)
{
return (struct extended_attribute *)((char *)fnode + fnode->ea_offs + fnode->acl_size_s + fnode->ea_size_s);
}
static inline struct extended_attribute *next_ea(struct extended_attribute *ea)
{
return (struct extended_attribute *)((char *)ea + 5 + ea->namelen + ea->valuelen);
}
static inline secno ea_sec(struct extended_attribute *ea)
{
return *(secno *)((char *)ea + 9 + ea->namelen);
}
static inline secno ea_len(struct extended_attribute *ea)
{
return *(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(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(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, 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_lock_creation(struct super_block *);
void hpfs_unlock_creation(struct super_block *);
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);
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 *, 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 */
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 *);
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 *);
void hpfs_decide_conv(struct inode *, 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 */
void hpfs_error(struct super_block *, const char *, ...)
__attribute__((format (printf, 2, 3)));
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() is a leftover from the big kernel lock.
* Right now, these functions are empty and only left
* for documentation purposes. The file system no longer
* works on SMP systems, so the lock is not needed
* any more.
*
* If someone is interested in making it work again, this
* would be the place to start by adding a per-superblock
* mutex and fixing all the bugs and performance issues
* caused by that.
*/
static inline void hpfs_lock(struct super_block *s)
{
}
static inline void hpfs_unlock(struct super_block *s)
{
}