kernel-ark/fs/ufs/util.h
Mark Fortescue 252e211e90 Add in SunOS 4.1.x compatible mode for UFS
Add in support for SunOS 4.1.x flavor of BSD 4.2 UFS filing system Macros have
been put in to alow suport for the old static table Cylinder Groups but this
implementation does not use them yet.

This also fixes Solaris UFS filing system access by disabling fast symbolic
links as Sun's version of UFS does not support on-disk fast symbolic links.

Tested by:
  Ppartitioning a new disk using SunOS 4.1.1, creating a UFS filing system on
  one of the partitions and writing some files to the filing system.
  Using Linux-2.6.22 (patched) to read the files and then write a shed load of
  files to the UFS partition.
  Using SunOS 4.1.1 to verify the filing system is OK and to check the files.
The test host is a sun4c SS1 Clone.

[akpm@linux-foundation.org: coding style fixes]
[adobriyan@gmail.com: fix oops]
Signed-off-by: Mark Fortescue <mark@mtfhpc.demon.co.uk>
Cc: Evgeniy Dushistov <dushistov@mail.ru>
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-17 08:42:49 -07:00

596 lines
16 KiB
C

/*
* 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))
/*
* functions used for retyping
*/
static inline struct ufs_buffer_head *UCPI_UBH(struct ufs_cg_private_info *cpi)
{
return &cpi->c_ubh;
}
static inline struct ufs_buffer_head *USPI_UBH(struct ufs_sb_private_info *spi)
{
return &spi->s_ubh;
}
/*
* 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_SUNOS:
if (fs32_to_cpu(sb, usb3->fs_postblformat) == UFS_42POSTBLFMT)
return fs32_to_cpu(sb, usb1->fs_u0.fs_sun.fs_state);
/* Fall Through to UFS_ST_SUN */
case UFS_ST_SUN:
return fs32_to_cpu(sb, usb3->fs_un2.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_un2.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_SUNOS:
if (fs32_to_cpu(sb, usb3->fs_postblformat == UFS_42POSTBLFMT)) {
usb1->fs_u0.fs_sun.fs_state = cpu_to_fs32(sb, value);
break;
}
/* Fall Through to UFS_ST_SUN */
case UFS_ST_SUN:
usb3->fs_un2.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_un2.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_un2.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_SUNOS:
case UFS_ST_SUN:
((__fs32 *)&tmp)[0] = usb3->fs_un2.fs_sun.fs_qbmask[0];
((__fs32 *)&tmp)[1] = usb3->fs_un2.fs_sun.fs_qbmask[1];
break;
case UFS_ST_SUNx86:
((__fs32 *)&tmp)[0] = usb3->fs_un2.fs_sunx86.fs_qbmask[0];
((__fs32 *)&tmp)[1] = usb3->fs_un2.fs_sunx86.fs_qbmask[1];
break;
case UFS_ST_44BSD:
((__fs32 *)&tmp)[0] = usb3->fs_un2.fs_44.fs_qbmask[0];
((__fs32 *)&tmp)[1] = usb3->fs_un2.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_SUNOS:
case UFS_ST_SUN:
((__fs32 *)&tmp)[0] = usb3->fs_un2.fs_sun.fs_qfmask[0];
((__fs32 *)&tmp)[1] = usb3->fs_un2.fs_sun.fs_qfmask[1];
break;
case UFS_ST_SUNx86:
((__fs32 *)&tmp)[0] = usb3->fs_un2.fs_sunx86.fs_qfmask[0];
((__fs32 *)&tmp)[1] = usb3->fs_un2.fs_sunx86.fs_qfmask[1];
break;
case UFS_ST_44BSD:
((__fs32 *)&tmp)[0] = usb3->fs_un2.fs_44.fs_qfmask[0];
((__fs32 *)&tmp)[1] = usb3->fs_un2.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_44BSD:
return fs32_to_cpu(sb, inode->ui_u3.ui_44.ui_uid);
case UFS_UID_EFT:
if (inode->ui_u1.oldids.ui_suid == 0xFFFF)
return fs32_to_cpu(sb, inode->ui_u3.ui_sun.ui_uid);
/* Fall through */
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_44BSD:
inode->ui_u3.ui_44.ui_uid = cpu_to_fs32(sb, value);
inode->ui_u1.oldids.ui_suid = cpu_to_fs16(sb, value);
break;
case UFS_UID_EFT:
inode->ui_u3.ui_sun.ui_uid = cpu_to_fs32(sb, value);
if (value > 0xFFFF)
value = 0xFFFF;
/* Fall through */
default:
inode->ui_u1.oldids.ui_suid = cpu_to_fs16(sb, value);
break;
}
}
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_44BSD:
return fs32_to_cpu(sb, inode->ui_u3.ui_44.ui_gid);
case UFS_UID_EFT:
if (inode->ui_u1.oldids.ui_suid == 0xFFFF)
return fs32_to_cpu(sb, inode->ui_u3.ui_sun.ui_gid);
/* Fall through */
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_44BSD:
inode->ui_u3.ui_44.ui_gid = cpu_to_fs32(sb, value);
inode->ui_u1.oldids.ui_sgid = cpu_to_fs16(sb, value);
break;
case UFS_UID_EFT:
inode->ui_u3.ui_sun.ui_gid = cpu_to_fs32(sb, value);
if (value > 0xFFFF)
value = 0xFFFF;
/* Fall through */
default:
inode->ui_u1.oldids.ui_sgid = cpu_to_fs16(sb, value);
break;
}
}
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);
extern int __ufs_write_begin(struct file *file, struct address_space *mapping,
loff_t pos, unsigned len, unsigned flags,
struct page **pagep, void **fsdata);
/*
* 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, struct ufs_buffer_head *);
extern void ubh_wait_on_buffer (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);
/* This functions works with cache pages*/
extern struct page *ufs_get_locked_page(struct address_space *mapping,
pgoff_t index);
static inline void ufs_put_locked_page(struct page *page)
{
unlock_page(page);
page_cache_release(page);
}
/*
* macros and inline function to get important structures from ufs_sb_private_info
*/
static inline void *get_usb_offset(struct ufs_sb_private_info *uspi,
unsigned int offset)
{
unsigned int index;
index = offset >> uspi->s_fshift;
offset &= ~uspi->s_fmask;
return uspi->s_ubh.bh[index]->b_data + offset;
}
#define ubh_get_usb_first(uspi) \
((struct ufs_super_block_first *)get_usb_offset((uspi), 0))
#define ubh_get_usb_second(uspi) \
((struct ufs_super_block_second *)get_usb_offset((uspi), UFS_SECTOR_SIZE))
#define ubh_get_usb_third(uspi) \
((struct ufs_super_block_third *)get_usb_offset((uspi), 2*UFS_SECTOR_SIZE))
#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_addr64(ubh,begin) \
(((__fs64*)((ubh)->bh[(begin) >> (uspi->s_fshift-3)]->b_data)) + \
((begin) & ((uspi->s_fsize>>3) - 1)))
#define ubh_get_addr ubh_get_addr8
static inline void *ubh_get_data_ptr(struct ufs_sb_private_info *uspi,
struct ufs_buffer_head *ubh,
u64 blk)
{
if (uspi->fs_magic == UFS2_MAGIC)
return ubh_get_addr64(ubh, blk);
else
return ubh_get_addr32(ubh, blk);
}
#define ubh_blkmap(ubh,begin,bit) \
((*ubh_get_addr(ubh, (begin) + ((bit) >> 3)) >> ((bit) & 7)) & (0xff >> (UFS_MAXFRAG - uspi->s_fpb)))
/*
* Determine the number of available frags given a
* percentage to hold in reserve.
*/
static inline u64
ufs_freespace(struct ufs_sb_private_info *uspi, int percentreserved)
{
return ufs_blkstofrags(uspi->cs_total.cs_nbfree) +
uspi->cs_total.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), (ucpi)->c_btotoff + ((cylno) << 2))))
#define ubh_cg_blks(ucpi,cylno,rpos) \
(*((__fs16*)ubh_get_addr(UCPI_UBH(ucpi), \
(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);
}
static inline void *ufs_get_direct_data_ptr(struct ufs_sb_private_info *uspi,
struct ufs_inode_info *ufsi,
unsigned blk)
{
BUG_ON(blk > UFS_TIND_BLOCK);
return uspi->fs_magic == UFS2_MAGIC ?
(void *)&ufsi->i_u1.u2_i_data[blk] :
(void *)&ufsi->i_u1.i_data[blk];
}
static inline u64 ufs_data_ptr_to_cpu(struct super_block *sb, void *p)
{
return UFS_SB(sb)->s_uspi->fs_magic == UFS2_MAGIC ?
fs64_to_cpu(sb, *(__fs64 *)p) :
fs32_to_cpu(sb, *(__fs32 *)p);
}
static inline void ufs_cpu_to_data_ptr(struct super_block *sb, void *p, u64 val)
{
if (UFS_SB(sb)->s_uspi->fs_magic == UFS2_MAGIC)
*(__fs64 *)p = cpu_to_fs64(sb, val);
else
*(__fs32 *)p = cpu_to_fs32(sb, val);
}
static inline void ufs_data_ptr_clear(struct ufs_sb_private_info *uspi,
void *p)
{
if (uspi->fs_magic == UFS2_MAGIC)
*(__fs64 *)p = 0;
else
*(__fs32 *)p = 0;
}
static inline int ufs_is_data_ptr_zero(struct ufs_sb_private_info *uspi,
void *p)
{
if (uspi->fs_magic == UFS2_MAGIC)
return *(__fs64 *)p == 0;
else
return *(__fs32 *)p == 0;
}