/*
* Calculate the number of buffer credits needed to write multiple pages in
* a single ext3 transaction.
*
* Check ext3_writepage_trans_blocks() for detail
*
*/
static int mlowerfs_ext3_credits_needed(struct inode *inode, __u64 len)
{
struct super_block *sb = inode->i_sb;
int _nblock = (int)(len >> sb->s_blocksize_bits); /* Any possible overflow? */
int nblock = _nblock + 2; /* Two block or more */
int nindirect = _nblock / EXT3_ADDR_PER_BLOCK(sb) + 2;
int ndindirect = _nblock / (EXT3_ADDR_PER_BLOCK(sb) * EXT3_ADDR_PER_BLOCK(sb)) + 2;
int nbitmaps = 1 + nblock + nindirect + ndindirect; /* tindirect */
int ngdblocks = nbitmaps > EXT3_SB(sb)->s_gdb_count ? EXT3_SB(sb)->s_gdb_count : nbitmaps;
int ngroups = nbitmaps > EXT3_SB(sb)->s_groups_count ? EXT3_SB(sb)->s_groups_count : nbitmaps;
int needed = 2; /* inodes + superblock */
int i = 0;
if (mlowerfs_ext3_should_journal_data(inode)) {
needed += nbitmaps;
}
needed += ngdblocks + ngroups;
#if defined(CONFIG_QUOTA)
if (!IS_NOQUOTA(inode)) {
for (i = 0; i < MAXQUOTAS; i++) {
if (sb_has_quota_active(sb, i)) {
needed += EXT3_SINGLEDATA_TRANS_BLOCKS;
}
}
}
#endif
return needed;
}
static int ext3_block_to_path(struct inode *inode,
long i_block, int offsets[4], int *boundary)
{
int ptrs = EXT3_ADDR_PER_BLOCK(inode->i_sb);
int ptrs_bits = EXT3_ADDR_PER_BLOCK_BITS(inode->i_sb);
const long direct_blocks = EXT3_NDIR_BLOCKS,
indirect_blocks = ptrs,
double_blocks = (1 << (ptrs_bits * 2));
int n = 0;
int final = 0;
if (i_block < 0) {
ext3_warning (inode->i_sb, "ext3_block_to_path", "block < 0");
} else if (i_block < direct_blocks) {
offsets[n++] = i_block;
final = direct_blocks;