static int ocfs2_block_group_search(struct inode *inode,
struct buffer_head *group_bh,
u32 bits_wanted, u32 min_bits,
u64 max_block,
u16 *bit_off, u16 *bits_found)
{
int ret = -ENOSPC;
u64 blkoff;
struct ocfs2_group_desc *bg = (struct ocfs2_group_desc *) group_bh->b_data;
BUG_ON(min_bits != 1);
BUG_ON(ocfs2_is_cluster_bitmap(inode));
if (bg->bg_free_bits_count) {
ret = ocfs2_block_group_find_clear_bits(OCFS2_SB(inode->i_sb),
group_bh, bits_wanted,
le16_to_cpu(bg->bg_bits),
bit_off, bits_found);
if (!ret && max_block) {
blkoff = le64_to_cpu(bg->bg_blkno) + *bit_off +
*bits_found;
mlog(0, "Checking %llu against %llu\n",
(unsigned long long)blkoff,
(unsigned long long)max_block);
if (blkoff > max_block)
ret = -ENOSPC;
}
}
return ret;
}
/* return 0 on success, -ENOSPC to keep searching and any other < 0
* value on error. */
static int ocfs2_cluster_group_search(struct inode *inode,
struct buffer_head *group_bh,
u32 bits_wanted, u32 min_bits,
u16 *bit_off, u16 *bits_found)
{
int search = -ENOSPC;
int ret;
struct ocfs2_group_desc *gd = (struct ocfs2_group_desc *) group_bh->b_data;
u16 tmp_off, tmp_found;
unsigned int max_bits, gd_cluster_off;
BUG_ON(!ocfs2_is_cluster_bitmap(inode));
if (gd->bg_free_bits_count) {
max_bits = le16_to_cpu(gd->bg_bits);
/* Tail groups in cluster bitmaps which aren't cpg
* aligned are prone to partial extention by a failed
* fs resize. If the file system resize never got to
* update the dinode cluster count, then we don't want
* to trust any clusters past it, regardless of what
* the group descriptor says. */
gd_cluster_off = ocfs2_blocks_to_clusters(inode->i_sb,
le64_to_cpu(gd->bg_blkno));
if ((gd_cluster_off + max_bits) >
OCFS2_I(inode)->ip_clusters) {
max_bits = OCFS2_I(inode)->ip_clusters - gd_cluster_off;
mlog(0, "Desc %llu, bg_bits %u, clusters %u, use %u\n",
(unsigned long long)le64_to_cpu(gd->bg_blkno),
le16_to_cpu(gd->bg_bits),
OCFS2_I(inode)->ip_clusters, max_bits);
}
ret = ocfs2_block_group_find_clear_bits(OCFS2_SB(inode->i_sb),
group_bh, bits_wanted,
max_bits,
&tmp_off, &tmp_found);
if (ret)
return ret;
/* ocfs2_block_group_find_clear_bits() might
* return success, but we still want to return
* -ENOSPC unless it found the minimum number
* of bits. */
if (min_bits <= tmp_found) {
*bit_off = tmp_off;
*bits_found = tmp_found;
search = 0; /* success */
}
}
return search;
}
static int ocfs2_block_group_search(struct inode *inode,
struct buffer_head *group_bh,
u32 bits_wanted, u32 min_bits,
u16 *bit_off, u16 *bits_found)
{
int ret = -ENOSPC;
struct ocfs2_group_desc *bg = (struct ocfs2_group_desc *) group_bh->b_data;
BUG_ON(min_bits != 1);
BUG_ON(ocfs2_is_cluster_bitmap(inode));
if (bg->bg_free_bits_count)
ret = ocfs2_block_group_find_clear_bits(OCFS2_SB(inode->i_sb),
group_bh, bits_wanted,
le16_to_cpu(bg->bg_bits),
bit_off, bits_found);
return ret;
}
