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root/fs/ufs/util.h

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INCLUDED FROM


DEFINITIONS

This source file includes following definitions.
  1. UCPI_UBH
  2. USPI_UBH
  3. ufs_get_fs_state
  4. ufs_set_fs_state
  5. ufs_get_fs_npsect
  6. ufs_get_fs_qbmask
  7. ufs_get_fs_qfmask
  8. ufs_get_de_namlen
  9. ufs_set_de_namlen
  10. ufs_set_de_type
  11. ufs_get_inode_uid
  12. ufs_set_inode_uid
  13. ufs_get_inode_gid
  14. ufs_set_inode_gid
  15. ufs_put_locked_page
  16. get_usb_offset
  17. ubh_get_data_ptr
  18. ufs_freespace
  19. _ubh_find_next_zero_bit_
  20. find_last_zero_bit
  21. _ubh_find_last_zero_bit_
  22. _ubh_isblockset_
  23. _ubh_clrblock_
  24. _ubh_setblock_
  25. ufs_fragacct
  26. ufs_get_direct_data_ptr
  27. ufs_data_ptr_to_cpu
  28. ufs_cpu_to_data_ptr
  29. ufs_data_ptr_clear
  30. ufs_is_data_ptr_zero

/*
 *  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;
}

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