static struct f2fs_dir_entry *find_in_block(struct page *dentry_page,
struct qstr *name, int *max_slots,
f2fs_hash_t namehash, struct page **res_page)
{
struct f2fs_dir_entry *de;
unsigned long bit_pos = 0;
struct f2fs_dentry_block *dentry_blk = kmap(dentry_page);
const void *dentry_bits = &dentry_blk->dentry_bitmap;
int max_len = 0;
while (bit_pos < NR_DENTRY_IN_BLOCK) {
if (!test_bit_le(bit_pos, dentry_bits)) {
if (bit_pos == 0)
max_len = 1;
else if (!test_bit_le(bit_pos - 1, dentry_bits))
max_len++;
bit_pos++;
continue;
}
de = &dentry_blk->dentry[bit_pos];
if (early_match_name(name->len, namehash, de)) {
if (!memcmp(dentry_blk->filename[bit_pos],
name->name,
name->len)) {
*res_page = dentry_page;
goto found;
}
}
if (max_len > *max_slots) {
*max_slots = max_len;
max_len = 0;
}
/*
* For the most part, it should be a bug when name_len is zero.
* We stop here for figuring out where the bugs are occurred.
*/
f2fs_bug_on(!de->name_len);
bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len));
}
de = NULL;
kunmap(dentry_page);
found:
if (max_len > *max_slots)
*max_slots = max_len;
return de;
}
struct f2fs_dir_entry *find_target_dentry(struct qstr *name, int *max_slots,
struct f2fs_dentry_ptr *d, unsigned int flags)
{
struct f2fs_dir_entry *de;
unsigned long bit_pos = 0;
f2fs_hash_t namehash = f2fs_dentry_hash(name);
int max_len = 0;
if (max_slots)
*max_slots = 0;
while (bit_pos < d->max) {
if (!test_bit_le(bit_pos, d->bitmap)) {
if (bit_pos == 0)
max_len = 1;
else if (!test_bit_le(bit_pos - 1, d->bitmap))
max_len++;
bit_pos++;
continue;
}
de = &d->dentry[bit_pos];
if (flags & LOOKUP_NOCASE) {
if ((le16_to_cpu(de->name_len) == name->len) &&
!strncasecmp(d->filename[bit_pos],
name->name, name->len))
goto found;
} else if (early_match_name(name->len, namehash, de) &&
!memcmp(d->filename[bit_pos], name->name, name->len)) {
goto found;
}
if (max_slots && *max_slots >= 0 && max_len > *max_slots) {
*max_slots = max_len;
max_len = 0;
}
/* remain bug on condition */
if (unlikely(!de->name_len))
d->max = -1;
bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len));
}
de = NULL;
found:
if (max_slots && max_len > *max_slots)
*max_slots = max_len;
return de;
}
static struct f2fs_dir_entry *find_in_block(struct page *dentry_page,
const char *name, size_t namelen, int *max_slots,
f2fs_hash_t namehash, struct page **res_page,
bool nocase)
{
struct f2fs_dir_entry *de;
unsigned long bit_pos, end_pos, next_pos;
struct f2fs_dentry_block *dentry_blk = kmap(dentry_page);
int slots;
bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap,
NR_DENTRY_IN_BLOCK, 0);
while (bit_pos < NR_DENTRY_IN_BLOCK) {
de = &dentry_blk->dentry[bit_pos];
slots = GET_DENTRY_SLOTS(le16_to_cpu(de->name_len));
if (nocase) {
if ((le16_to_cpu(de->name_len) == namelen) &&
!strncasecmp(dentry_blk->filename[bit_pos],
name, namelen)) {
*res_page = dentry_page;
goto found;
}
} else if (early_match_name(name, namelen, namehash, de)) {
if (!memcmp(dentry_blk->filename[bit_pos],
name, namelen)) {
*res_page = dentry_page;
goto found;
}
}
next_pos = bit_pos + slots;
bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap,
NR_DENTRY_IN_BLOCK, next_pos);
if (bit_pos >= NR_DENTRY_IN_BLOCK)
end_pos = NR_DENTRY_IN_BLOCK;
else
end_pos = bit_pos;
if (*max_slots < end_pos - next_pos)
*max_slots = end_pos - next_pos;
}
de = NULL;
kunmap(dentry_page);
found:
return de;
}
static struct f2fs_dir_entry *find_in_block(struct page *dentry_page,
const char *name, size_t namelen, int *max_slots,
f2fs_hash_t namehash, struct page **res_page)
{
struct f2fs_dir_entry *de;
unsigned long bit_pos = 0;
struct f2fs_dentry_block *dentry_blk = kmap(dentry_page);
const void *dentry_bits = &dentry_blk->dentry_bitmap;
int max_len = 0;
while (bit_pos < NR_DENTRY_IN_BLOCK) {
if (!test_bit_le(bit_pos, dentry_bits)) {
if (bit_pos == 0)
max_len = 1;
else if (!test_bit_le(bit_pos - 1, dentry_bits))
max_len++;
bit_pos++;
continue;
}
de = &dentry_blk->dentry[bit_pos];
if (early_match_name(name, namelen, namehash, de)) {
if (!memcmp(dentry_blk->filename[bit_pos],
name, namelen)) {
*res_page = dentry_page;
goto found;
}
}
if (max_len > *max_slots) {
*max_slots = max_len;
max_len = 0;
}
bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len));
}
de = NULL;
kunmap(dentry_page);
found:
if (max_len > *max_slots)
*max_slots = max_len;
return de;
}
