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linux/fs/ufs/util.h
Linus Torvalds 1da177e4c3 Linux-2.6.12-rc2 
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!
2005-04-16 15:20:36 -07:00

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/*
* linux/fs/ufs/util.h
*
* Copyright (C) 1998
* Daniel Pirkl <daniel.pirkl@email.cz>
* Charles University, Faculty of Mathematics and Physics
*/
#include <linux/buffer_head.h>
#include <linux/fs.h>
#include "swab.h"
/*
* some useful macros
*/
#define in_range(b,first,len) ((b)>=(first)&&(b)<(first)+(len))
/*
* macros used for retyping
*/
#define UCPI_UBH ((struct ufs_buffer_head *)ucpi)
#define USPI_UBH ((struct ufs_buffer_head *)uspi)
/*
* macros used for accessing structures
*/
static inline s32
ufs_get_fs_state(struct super_block *sb, struct ufs_super_block_first *usb1,
struct ufs_super_block_third *usb3)
{
switch (UFS_SB(sb)->s_flags & UFS_ST_MASK) {
case UFS_ST_SUN:
return fs32_to_cpu(sb, usb3->fs_u2.fs_sun.fs_state);
case UFS_ST_SUNx86:
return fs32_to_cpu(sb, usb1->fs_u1.fs_sunx86.fs_state);
case UFS_ST_44BSD:
default:
return fs32_to_cpu(sb, usb3->fs_u2.fs_44.fs_state);
}
}
static inline void
ufs_set_fs_state(struct super_block *sb, struct ufs_super_block_first *usb1,
struct ufs_super_block_third *usb3, s32 value)
{
switch (UFS_SB(sb)->s_flags & UFS_ST_MASK) {
case UFS_ST_SUN:
usb3->fs_u2.fs_sun.fs_state = cpu_to_fs32(sb, value);
break;
case UFS_ST_SUNx86:
usb1->fs_u1.fs_sunx86.fs_state = cpu_to_fs32(sb, value);
break;
case UFS_ST_44BSD:
usb3->fs_u2.fs_44.fs_state = cpu_to_fs32(sb, value);
break;
}
}
static inline u32
ufs_get_fs_npsect(struct super_block *sb, struct ufs_super_block_first *usb1,
struct ufs_super_block_third *usb3)
{
if ((UFS_SB(sb)->s_flags & UFS_ST_MASK) == UFS_ST_SUNx86)
return fs32_to_cpu(sb, usb3->fs_u2.fs_sunx86.fs_npsect);
else
return fs32_to_cpu(sb, usb1->fs_u1.fs_sun.fs_npsect);
}
static inline u64
ufs_get_fs_qbmask(struct super_block *sb, struct ufs_super_block_third *usb3)
{
__fs64 tmp;
switch (UFS_SB(sb)->s_flags & UFS_ST_MASK) {
case UFS_ST_SUN:
((__fs32 *)&tmp)[0] = usb3->fs_u2.fs_sun.fs_qbmask[0];
((__fs32 *)&tmp)[1] = usb3->fs_u2.fs_sun.fs_qbmask[1];
break;
case UFS_ST_SUNx86:
((__fs32 *)&tmp)[0] = usb3->fs_u2.fs_sunx86.fs_qbmask[0];
((__fs32 *)&tmp)[1] = usb3->fs_u2.fs_sunx86.fs_qbmask[1];
break;
case UFS_ST_44BSD:
((__fs32 *)&tmp)[0] = usb3->fs_u2.fs_44.fs_qbmask[0];
((__fs32 *)&tmp)[1] = usb3->fs_u2.fs_44.fs_qbmask[1];
break;
}
return fs64_to_cpu(sb, tmp);
}
static inline u64
ufs_get_fs_qfmask(struct super_block *sb, struct ufs_super_block_third *usb3)
{
__fs64 tmp;
switch (UFS_SB(sb)->s_flags & UFS_ST_MASK) {
case UFS_ST_SUN:
((__fs32 *)&tmp)[0] = usb3->fs_u2.fs_sun.fs_qfmask[0];
((__fs32 *)&tmp)[1] = usb3->fs_u2.fs_sun.fs_qfmask[1];
break;
case UFS_ST_SUNx86:
((__fs32 *)&tmp)[0] = usb3->fs_u2.fs_sunx86.fs_qfmask[0];
((__fs32 *)&tmp)[1] = usb3->fs_u2.fs_sunx86.fs_qfmask[1];
break;
case UFS_ST_44BSD:
((__fs32 *)&tmp)[0] = usb3->fs_u2.fs_44.fs_qfmask[0];
((__fs32 *)&tmp)[1] = usb3->fs_u2.fs_44.fs_qfmask[1];
break;
}
return fs64_to_cpu(sb, tmp);
}
static inline u16
ufs_get_de_namlen(struct super_block *sb, struct ufs_dir_entry *de)
{
if ((UFS_SB(sb)->s_flags & UFS_DE_MASK) == UFS_DE_OLD)
return fs16_to_cpu(sb, de->d_u.d_namlen);
else
return de->d_u.d_44.d_namlen; /* XXX this seems wrong */
}
static inline void
ufs_set_de_namlen(struct super_block *sb, struct ufs_dir_entry *de, u16 value)
{
if ((UFS_SB(sb)->s_flags & UFS_DE_MASK) == UFS_DE_OLD)
de->d_u.d_namlen = cpu_to_fs16(sb, value);
else
de->d_u.d_44.d_namlen = value; /* XXX this seems wrong */
}
static inline void
ufs_set_de_type(struct super_block *sb, struct ufs_dir_entry *de, int mode)
{
if ((UFS_SB(sb)->s_flags & UFS_DE_MASK) != UFS_DE_44BSD)
return;
/*
* TODO turn this into a table lookup
*/
switch (mode & S_IFMT) {
case S_IFSOCK:
de->d_u.d_44.d_type = DT_SOCK;
break;
case S_IFLNK:
de->d_u.d_44.d_type = DT_LNK;
break;
case S_IFREG:
de->d_u.d_44.d_type = DT_REG;
break;
case S_IFBLK:
de->d_u.d_44.d_type = DT_BLK;
break;
case S_IFDIR:
de->d_u.d_44.d_type = DT_DIR;
break;
case S_IFCHR:
de->d_u.d_44.d_type = DT_CHR;
break;
case S_IFIFO:
de->d_u.d_44.d_type = DT_FIFO;
break;
default:
de->d_u.d_44.d_type = DT_UNKNOWN;
}
}
static inline u32
ufs_get_inode_uid(struct super_block *sb, struct ufs_inode *inode)
{
switch (UFS_SB(sb)->s_flags & UFS_UID_MASK) {
case UFS_UID_EFT:
return fs32_to_cpu(sb, inode->ui_u3.ui_sun.ui_uid);
case UFS_UID_44BSD:
return fs32_to_cpu(sb, inode->ui_u3.ui_44.ui_uid);
default:
return fs16_to_cpu(sb, inode->ui_u1.oldids.ui_suid);
}
}
static inline void
ufs_set_inode_uid(struct super_block *sb, struct ufs_inode *inode, u32 value)
{
switch (UFS_SB(sb)->s_flags & UFS_UID_MASK) {
case UFS_UID_EFT:
inode->ui_u3.ui_sun.ui_uid = cpu_to_fs32(sb, value);
break;
case UFS_UID_44BSD:
inode->ui_u3.ui_44.ui_uid = cpu_to_fs32(sb, value);
break;
}
inode->ui_u1.oldids.ui_suid = cpu_to_fs16(sb, value);
}
static inline u32
ufs_get_inode_gid(struct super_block *sb, struct ufs_inode *inode)
{
switch (UFS_SB(sb)->s_flags & UFS_UID_MASK) {
case UFS_UID_EFT:
return fs32_to_cpu(sb, inode->ui_u3.ui_sun.ui_gid);
case UFS_UID_44BSD:
return fs32_to_cpu(sb, inode->ui_u3.ui_44.ui_gid);
default:
return fs16_to_cpu(sb, inode->ui_u1.oldids.ui_sgid);
}
}
static inline void
ufs_set_inode_gid(struct super_block *sb, struct ufs_inode *inode, u32 value)
{
switch (UFS_SB(sb)->s_flags & UFS_UID_MASK) {
case UFS_UID_EFT:
inode->ui_u3.ui_sun.ui_gid = cpu_to_fs32(sb, value);
break;
case UFS_UID_44BSD:
inode->ui_u3.ui_44.ui_gid = cpu_to_fs32(sb, value);
break;
}
inode->ui_u1.oldids.ui_sgid = cpu_to_fs16(sb, value);
}
extern dev_t ufs_get_inode_dev(struct super_block *, struct ufs_inode_info *);
extern void ufs_set_inode_dev(struct super_block *, struct ufs_inode_info *, dev_t);
/*
* These functions manipulate ufs buffers
*/
#define ubh_bread(sb,fragment,size) _ubh_bread_(uspi,sb,fragment,size)
extern struct ufs_buffer_head * _ubh_bread_(struct ufs_sb_private_info *, struct super_block *, u64 , u64);
extern struct ufs_buffer_head * ubh_bread_uspi(struct ufs_sb_private_info *, struct super_block *, u64, u64);
extern void ubh_brelse (struct ufs_buffer_head *);
extern void ubh_brelse_uspi (struct ufs_sb_private_info *);
extern void ubh_mark_buffer_dirty (struct ufs_buffer_head *);
extern void ubh_mark_buffer_uptodate (struct ufs_buffer_head *, int);
extern void ubh_ll_rw_block (int, unsigned, struct ufs_buffer_head **);
extern void ubh_wait_on_buffer (struct ufs_buffer_head *);
extern unsigned ubh_max_bcount (struct ufs_buffer_head *);
extern void ubh_bforget (struct ufs_buffer_head *);
extern int ubh_buffer_dirty (struct ufs_buffer_head *);
#define ubh_ubhcpymem(mem,ubh,size) _ubh_ubhcpymem_(uspi,mem,ubh,size)
extern void _ubh_ubhcpymem_(struct ufs_sb_private_info *, unsigned char *, struct ufs_buffer_head *, unsigned);
#define ubh_memcpyubh(ubh,mem,size) _ubh_memcpyubh_(uspi,ubh,mem,size)
extern void _ubh_memcpyubh_(struct ufs_sb_private_info *, struct ufs_buffer_head *, unsigned char *, unsigned);
/*
* macros to get important structures from ufs_buffer_head
*/
#define ubh_get_usb_first(ubh) \
((struct ufs_super_block_first *)((ubh)->bh[0]->b_data))
#define ubh_get_usb_second(ubh) \
((struct ufs_super_block_second *)(ubh)-> \
bh[UFS_SECTOR_SIZE >> uspi->s_fshift]->b_data + (UFS_SECTOR_SIZE & ~uspi->s_fmask))
#define ubh_get_usb_third(ubh) \
((struct ufs_super_block_third *)((ubh)-> \
bh[UFS_SECTOR_SIZE*2 >> uspi->s_fshift]->b_data + (UFS_SECTOR_SIZE*2 & ~uspi->s_fmask)))
#define ubh_get_ucg(ubh) \
((struct ufs_cylinder_group *)((ubh)->bh[0]->b_data))
/*
* Extract byte from ufs_buffer_head
* Extract the bits for a block from a map inside ufs_buffer_head
*/
#define ubh_get_addr8(ubh,begin) \
((u8*)(ubh)->bh[(begin) >> uspi->s_fshift]->b_data + \
((begin) & ~uspi->s_fmask))
#define ubh_get_addr16(ubh,begin) \
(((__fs16*)((ubh)->bh[(begin) >> (uspi->s_fshift-1)]->b_data)) + \
((begin) & (uspi->fsize>>1) - 1)))
#define ubh_get_addr32(ubh,begin) \
(((__fs32*)((ubh)->bh[(begin) >> (uspi->s_fshift-2)]->b_data)) + \
((begin) & ((uspi->s_fsize>>2) - 1)))
#define ubh_get_addr ubh_get_addr8
#define ubh_blkmap(ubh,begin,bit) \
((*ubh_get_addr(ubh, (begin) + ((bit) >> 3)) >> ((bit) & 7)) & (0xff >> (UFS_MAXFRAG - uspi->s_fpb)))
/*
* Macros for access to superblock array structures
*/
#define ubh_postbl(ubh,cylno,i) \
((uspi->s_postblformat != UFS_DYNAMICPOSTBLFMT) \
? (*(__s16*)(ubh_get_addr(ubh, \
(unsigned)(&((struct ufs_super_block *)0)->fs_opostbl) \
+ (((cylno) * 16 + (i)) << 1) ) )) \
: (*(__s16*)(ubh_get_addr(ubh, \
uspi->s_postbloff + (((cylno) * uspi->s_nrpos + (i)) << 1) ))))
#define ubh_rotbl(ubh,i) \
((uspi->s_postblformat != UFS_DYNAMICPOSTBLFMT) \
? (*(__u8*)(ubh_get_addr(ubh, \
(unsigned)(&((struct ufs_super_block *)0)->fs_space) + (i)))) \
: (*(__u8*)(ubh_get_addr(ubh, uspi->s_rotbloff + (i)))))
/*
* Determine the number of available frags given a
* percentage to hold in reserve.
*/
#define ufs_freespace(usb, percentreserved) \
(ufs_blkstofrags(fs32_to_cpu(sb, (usb)->fs_cstotal.cs_nbfree)) + \
fs32_to_cpu(sb, (usb)->fs_cstotal.cs_nffree) - (uspi->s_dsize * (percentreserved) / 100))
/*
* Macros to access cylinder group array structures
*/
#define ubh_cg_blktot(ucpi,cylno) \
(*((__fs32*)ubh_get_addr(UCPI_UBH, (ucpi)->c_btotoff + ((cylno) << 2))))
#define ubh_cg_blks(ucpi,cylno,rpos) \
(*((__fs16*)ubh_get_addr(UCPI_UBH, \
(ucpi)->c_boff + (((cylno) * uspi->s_nrpos + (rpos)) << 1 ))))
/*
* Bitmap operations
* These functions work like classical bitmap operations.
* The difference is that we don't have the whole bitmap
* in one contiguous chunk of memory, but in several buffers.
* The parameters of each function are super_block, ufs_buffer_head and
* position of the beginning of the bitmap.
*/
#define ubh_setbit(ubh,begin,bit) \
(*ubh_get_addr(ubh, (begin) + ((bit) >> 3)) |= (1 << ((bit) & 7)))
#define ubh_clrbit(ubh,begin,bit) \
(*ubh_get_addr (ubh, (begin) + ((bit) >> 3)) &= ~(1 << ((bit) & 7)))
#define ubh_isset(ubh,begin,bit) \
(*ubh_get_addr (ubh, (begin) + ((bit) >> 3)) & (1 << ((bit) & 7)))
#define ubh_isclr(ubh,begin,bit) (!ubh_isset(ubh,begin,bit))
#define ubh_find_first_zero_bit(ubh,begin,size) _ubh_find_next_zero_bit_(uspi,ubh,begin,size,0)
#define ubh_find_next_zero_bit(ubh,begin,size,offset) _ubh_find_next_zero_bit_(uspi,ubh,begin,size,offset)
static inline unsigned _ubh_find_next_zero_bit_(
struct ufs_sb_private_info * uspi, struct ufs_buffer_head * ubh,
unsigned begin, unsigned size, unsigned offset)
{
unsigned base, count, pos;
size -= offset;
begin <<= 3;
offset += begin;
base = offset >> uspi->s_bpfshift;
offset &= uspi->s_bpfmask;
for (;;) {
count = min_t(unsigned int, size + offset, uspi->s_bpf);
size -= count - offset;
pos = ext2_find_next_zero_bit (ubh->bh[base]->b_data, count, offset);
if (pos < count || !size)
break;
base++;
offset = 0;
}
return (base << uspi->s_bpfshift) + pos - begin;
}
static inline unsigned find_last_zero_bit (unsigned char * bitmap,
unsigned size, unsigned offset)
{
unsigned bit, i;
unsigned char * mapp;
unsigned char map;
mapp = bitmap + (size >> 3);
map = *mapp--;
bit = 1 << (size & 7);
for (i = size; i > offset; i--) {
if ((map & bit) == 0)
break;
if ((i & 7) != 0) {
bit >>= 1;
} else {
map = *mapp--;
bit = 1 << 7;
}
}
return i;
}
#define ubh_find_last_zero_bit(ubh,begin,size,offset) _ubh_find_last_zero_bit_(uspi,ubh,begin,size,offset)
static inline unsigned _ubh_find_last_zero_bit_(
struct ufs_sb_private_info * uspi, struct ufs_buffer_head * ubh,
unsigned begin, unsigned start, unsigned end)
{
unsigned base, count, pos, size;
size = start - end;
begin <<= 3;
start += begin;
base = start >> uspi->s_bpfshift;
start &= uspi->s_bpfmask;
for (;;) {
count = min_t(unsigned int,
size + (uspi->s_bpf - start), uspi->s_bpf)
- (uspi->s_bpf - start);
size -= count;
pos = find_last_zero_bit (ubh->bh[base]->b_data,
start, start - count);
if (pos > start - count || !size)
break;
base--;
start = uspi->s_bpf;
}
return (base << uspi->s_bpfshift) + pos - begin;
}
#define ubh_isblockclear(ubh,begin,block) (!_ubh_isblockset_(uspi,ubh,begin,block))
#define ubh_isblockset(ubh,begin,block) _ubh_isblockset_(uspi,ubh,begin,block)
static inline int _ubh_isblockset_(struct ufs_sb_private_info * uspi,
struct ufs_buffer_head * ubh, unsigned begin, unsigned block)
{
switch (uspi->s_fpb) {
case 8:
return (*ubh_get_addr (ubh, begin + block) == 0xff);
case 4:
return (*ubh_get_addr (ubh, begin + (block >> 1)) == (0x0f << ((block & 0x01) << 2)));
case 2:
return (*ubh_get_addr (ubh, begin + (block >> 2)) == (0x03 << ((block & 0x03) << 1)));
case 1:
return (*ubh_get_addr (ubh, begin + (block >> 3)) == (0x01 << (block & 0x07)));
}
return 0;
}
#define ubh_clrblock(ubh,begin,block) _ubh_clrblock_(uspi,ubh,begin,block)
static inline void _ubh_clrblock_(struct ufs_sb_private_info * uspi,
struct ufs_buffer_head * ubh, unsigned begin, unsigned block)
{
switch (uspi->s_fpb) {
case 8:
*ubh_get_addr (ubh, begin + block) = 0x00;
return;
case 4:
*ubh_get_addr (ubh, begin + (block >> 1)) &= ~(0x0f << ((block & 0x01) << 2));
return;
case 2:
*ubh_get_addr (ubh, begin + (block >> 2)) &= ~(0x03 << ((block & 0x03) << 1));
return;
case 1:
*ubh_get_addr (ubh, begin + (block >> 3)) &= ~(0x01 << ((block & 0x07)));
return;
}
}
#define ubh_setblock(ubh,begin,block) _ubh_setblock_(uspi,ubh,begin,block)
static inline void _ubh_setblock_(struct ufs_sb_private_info * uspi,
struct ufs_buffer_head * ubh, unsigned begin, unsigned block)
{
switch (uspi->s_fpb) {
case 8:
*ubh_get_addr(ubh, begin + block) = 0xff;
return;
case 4:
*ubh_get_addr(ubh, begin + (block >> 1)) |= (0x0f << ((block & 0x01) << 2));
return;
case 2:
*ubh_get_addr(ubh, begin + (block >> 2)) |= (0x03 << ((block & 0x03) << 1));
return;
case 1:
*ubh_get_addr(ubh, begin + (block >> 3)) |= (0x01 << ((block & 0x07)));
return;
}
}
static inline void ufs_fragacct (struct super_block * sb, unsigned blockmap,
__fs32 * fraglist, int cnt)
{
struct ufs_sb_private_info * uspi;
unsigned fragsize, pos;
uspi = UFS_SB(sb)->s_uspi;
fragsize = 0;
for (pos = 0; pos < uspi->s_fpb; pos++) {
if (blockmap & (1 << pos)) {
fragsize++;
}
else if (fragsize > 0) {
fs32_add(sb, &fraglist[fragsize], cnt);
fragsize = 0;
}
}
if (fragsize > 0 && fragsize < uspi->s_fpb)
fs32_add(sb, &fraglist[fragsize], cnt);
}
#define ubh_scanc(ubh,begin,size,table,mask) _ubh_scanc_(uspi,ubh,begin,size,table,mask)
static inline unsigned _ubh_scanc_(struct ufs_sb_private_info * uspi, struct ufs_buffer_head * ubh,
unsigned begin, unsigned size, unsigned char * table, unsigned char mask)
{
unsigned rest, offset;
unsigned char * cp;
offset = begin & ~uspi->s_fmask;
begin >>= uspi->s_fshift;
for (;;) {
if ((offset + size) < uspi->s_fsize)
rest = size;
else
rest = uspi->s_fsize - offset;
size -= rest;
cp = ubh->bh[begin]->b_data + offset;
while ((table[*cp++] & mask) == 0 && --rest);
if (rest || !size)
break;
begin++;
offset = 0;
}
return (size + rest);
}
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