static int trunc_direct(struct inode * inode)
{
struct super_block * sb;
unsigned int i;
u32 * p;
u32 block;
struct buffer_head * bh;
int retry = 0;
sb = inode->i_sb;
repeat:
for (i = ((unsigned long) inode->i_size + sb->sv_block_size_1) >> sb->sv_block_size_bits; i < 10; i++) {
p = inode->u.sysv_i.i_data + i;
block = *p;
if (!block)
continue;
bh = sv_get_hash_table(sb, inode->i_dev, block);
if ((i << sb->sv_block_size_bits) < inode->i_size) {
brelse(bh);
goto repeat;
}
if ((bh && bh->b_count != 1) || (block != *p)) {
retry = 1;
brelse(bh);
continue;
}
*p = 0;
mark_inode_dirty(inode);
brelse(bh);
sysv_free_block(sb,block);
}
return retry;
}
/* Sync one block. The block number is
* from_coh_ulong(*blockp) if convert=1, *blockp if convert=0.
*/
static int sync_block (struct inode * inode, u32 *blockp, int convert, int wait)
{
struct buffer_head * bh;
u32 tmp, block;
struct super_block * sb;
block = tmp = *blockp;
if (convert)
block = from_coh_ulong(block);
if (!block)
return 0;
sb = inode->i_sb;
bh = sv_get_hash_table(sb, inode->i_dev, block);
if (!bh)
return 0;
if (*blockp != tmp) {
brelse (bh);
return 1;
}
if (wait && buffer_req(bh) && !buffer_uptodate(bh)) {
brelse(bh);
return -1;
}
if (wait || !buffer_uptodate(bh) || !buffer_dirty(bh)) {
brelse(bh);
return 0;
}
ll_rw_block(WRITE, 1, &bh);
atomic_dec(&bh->b_count);
return 0;
}
static int trunc_indirect(struct inode * inode, unsigned long offset, sysv_zone_t * p, int convert, unsigned char * dirt)
{
unsigned long indtmp, indblock;
struct super_block * sb;
struct buffer_head * indbh;
unsigned int i;
sysv_zone_t * ind;
unsigned long tmp, block;
struct buffer_head * bh;
int retry = 0;
indblock = indtmp = *p;
if (convert)
indblock = from_coh_ulong(indblock);
if (!indblock)
return 0;
sb = inode->i_sb;
indbh = sv_bread(sb, inode->i_dev, indblock);
if (indtmp != *p) {
brelse(indbh);
return 1;
}
if (!indbh) {
*p = 0;
*dirt = 1;
return 0;
}
repeat:
if (inode->i_size < offset)
i = 0;
else
i = (inode->i_size - offset + sb->sv_block_size_1) >> sb->sv_block_size_bits;
for (; i < sb->sv_ind_per_block; i++) {
ind = ((sysv_zone_t *) indbh->b_data) + i;
block = tmp = *ind;
if (sb->sv_convert)
block = from_coh_ulong(block);
if (!block)
continue;
bh = sv_get_hash_table(sb, inode->i_dev, block);
if ((i << sb->sv_block_size_bits) + offset < inode->i_size) {
brelse(bh);
goto repeat;
}
if ((bh && bh->b_count != 1) || (tmp != *ind)) {
retry = 1;
brelse(bh);
continue;
}
*ind = 0;
mark_buffer_dirty(indbh, 1);
brelse(bh);
sysv_free_block(sb,block);
}
for (i = 0; i < sb->sv_ind_per_block; i++)
if (((sysv_zone_t *) indbh->b_data)[i])
goto done;
if ((indbh->b_count != 1) || (indtmp != *p)) {
brelse(indbh);
return 1;
}
*p = 0;
*dirt = 1;
sysv_free_block(sb,indblock);
done:
brelse(indbh);
return retry;
}
