static struct f2fs_dir_entry *find_in_level(struct inode *dir,
unsigned int level, struct qstr *name,
f2fs_hash_t namehash, struct page **res_page)
{
int s = GET_DENTRY_SLOTS(name->len);
unsigned int nbucket, nblock;
unsigned int bidx, end_block;
struct page *dentry_page;
struct f2fs_dir_entry *de = NULL;
bool room = false;
int max_slots = 0;
f2fs_bug_on(level > MAX_DIR_HASH_DEPTH);
nbucket = dir_buckets(level, F2FS_I(dir)->i_dir_level);
nblock = bucket_blocks(level);
bidx = dir_block_index(level, F2FS_I(dir)->i_dir_level,
le32_to_cpu(namehash) % nbucket);
end_block = bidx + nblock;
for (; bidx < end_block; bidx++) {
/* no need to allocate new dentry pages to all the indices */
dentry_page = find_data_page(dir, bidx, true);
if (IS_ERR(dentry_page)) {
room = true;
continue;
}
de = find_in_block(dentry_page, name, &max_slots,
namehash, res_page);
if (de)
break;
if (max_slots >= s)
room = true;
f2fs_put_page(dentry_page, 0);
}
if (!de && room && F2FS_I(dir)->chash != namehash) {
F2FS_I(dir)->chash = namehash;
F2FS_I(dir)->clevel = level;
}
return de;
}
void f2fs_update_dentry(struct inode *inode, struct f2fs_dentry_ptr *d,
const struct qstr *name, f2fs_hash_t name_hash,
unsigned int bit_pos)
{
struct f2fs_dir_entry *de;
int slots = GET_DENTRY_SLOTS(name->len);
int i;
de = &d->dentry[bit_pos];
de->hash_code = name_hash;
de->name_len = cpu_to_le16(name->len);
memcpy(d->filename[bit_pos], name->name, name->len);
de->ino = cpu_to_le32(inode->i_ino);
set_de_type(de, inode);
for (i = 0; i < slots; i++)
test_and_set_bit_le(bit_pos + i, (void *)d->bitmap);
}
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)) {
bit_pos++;
max_len++;
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_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 void f2fs_update_dentry(nid_t ino, int file_type,
struct f2fs_dentry_ptr *d,
const unsigned char *name, int len, f2fs_hash_t name_hash,
unsigned int bit_pos)
{
struct f2fs_dir_entry *de;
int slots = GET_DENTRY_SLOTS(len);
int i;
de = &d->dentry[bit_pos];
de->name_len = cpu_to_le16(len);
de->hash_code = name_hash;
memcpy(d->filename[bit_pos], name, len);
d->filename[bit_pos][len] = 0;
de->ino = cpu_to_le32(ino);
de->file_type = file_type;
for (i = 0; i < slots; i++)
test_and_set_bit_le(bit_pos + i, d->bitmap);
}
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;
}
/*
* It only removes the dentry from the dentry page, corresponding name
* entry in name page does not need to be touched during deletion.
*/
void f2fs_delete_entry(struct f2fs_dir_entry *dentry, struct page *page,
struct inode *dir, struct inode *inode)
{
struct f2fs_dentry_block *dentry_blk;
unsigned int bit_pos;
int slots = GET_DENTRY_SLOTS(le16_to_cpu(dentry->name_len));
int i;
if (f2fs_has_inline_dentry(dir))
return f2fs_delete_inline_entry(dentry, page, dir, inode);
lock_page(page);
f2fs_wait_on_page_writeback(page, DATA);
dentry_blk = page_address(page);
bit_pos = dentry - dentry_blk->dentry;
for (i = 0; i < slots; i++)
test_and_clear_bit_le(bit_pos + i, &dentry_blk->dentry_bitmap);
/* Let's check and deallocate this dentry page */
bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap,
NR_DENTRY_IN_BLOCK,
0);
kunmap(page); /* kunmap - pair of f2fs_find_entry */
set_page_dirty(page);
dir->i_ctime = dir->i_mtime = CURRENT_TIME;
if (inode)
f2fs_drop_nlink(dir, inode, NULL);
if (bit_pos == NR_DENTRY_IN_BLOCK) {
truncate_hole(dir, page->index, page->index + 1);
clear_page_dirty_for_io(page);
ClearPagePrivate(page);
ClearPageUptodate(page);
inode_dec_dirty_pages(dir);
}
f2fs_put_page(page, 1);
}
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, 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 (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;
}
/*
* Caller should grab and release a rwsem by calling f2fs_lock_op() and
* f2fs_unlock_op().
*/
int __f2fs_add_link(struct inode *dir, const struct qstr *name,
struct inode *inode)
{
unsigned int bit_pos;
unsigned int level;
unsigned int current_depth;
unsigned long bidx, block;
f2fs_hash_t dentry_hash;
struct f2fs_dir_entry *de;
unsigned int nbucket, nblock;
size_t namelen = name->len;
struct page *dentry_page = NULL;
struct f2fs_dentry_block *dentry_blk = NULL;
int slots = GET_DENTRY_SLOTS(namelen);
struct page *page;
int err = 0;
int i;
dentry_hash = f2fs_dentry_hash(name);
level = 0;
current_depth = F2FS_I(dir)->i_current_depth;
if (F2FS_I(dir)->chash == dentry_hash) {
level = F2FS_I(dir)->clevel;
F2FS_I(dir)->chash = 0;
}
start:
if (unlikely(current_depth == MAX_DIR_HASH_DEPTH))
return -ENOSPC;
/* Increase the depth, if required */
if (level == current_depth)
++current_depth;
nbucket = dir_buckets(level, F2FS_I(dir)->i_dir_level);
nblock = bucket_blocks(level);
bidx = dir_block_index(level, F2FS_I(dir)->i_dir_level,
(le32_to_cpu(dentry_hash) % nbucket));
for (block = bidx; block <= (bidx + nblock - 1); block++) {
dentry_page = get_new_data_page(dir, NULL, block, true);
if (IS_ERR(dentry_page))
return PTR_ERR(dentry_page);
dentry_blk = kmap(dentry_page);
bit_pos = room_for_filename(dentry_blk, slots);
if (bit_pos < NR_DENTRY_IN_BLOCK)
goto add_dentry;
kunmap(dentry_page);
f2fs_put_page(dentry_page, 1);
}
/* Move to next level to find the empty slot for new dentry */
++level;
goto start;
add_dentry:
f2fs_wait_on_page_writeback(dentry_page, DATA);
down_write(&F2FS_I(inode)->i_sem);
page = init_inode_metadata(inode, dir, name);
if (IS_ERR(page)) {
err = PTR_ERR(page);
goto fail;
}
de = &dentry_blk->dentry[bit_pos];
de->hash_code = dentry_hash;
de->name_len = cpu_to_le16(namelen);
memcpy(dentry_blk->filename[bit_pos], name->name, name->len);
de->ino = cpu_to_le32(inode->i_ino);
set_de_type(de, inode);
for (i = 0; i < slots; i++)
test_and_set_bit_le(bit_pos + i, &dentry_blk->dentry_bitmap);
set_page_dirty(dentry_page);
/* we don't need to mark_inode_dirty now */
F2FS_I(inode)->i_pino = dir->i_ino;
update_inode(inode, page);
f2fs_put_page(page, 1);
update_parent_metadata(dir, inode, current_depth);
fail:
up_write(&F2FS_I(inode)->i_sem);
if (is_inode_flag_set(F2FS_I(dir), FI_UPDATE_DIR)) {
update_inode_page(dir);
clear_inode_flag(F2FS_I(dir), FI_UPDATE_DIR);
}
kunmap(dentry_page);
f2fs_put_page(dentry_page, 1);
return err;
}
int f2fs_add_inline_entry(struct inode *dir, const struct qstr *name,
struct inode *inode, nid_t ino, umode_t mode)
{
struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
struct page *ipage;
unsigned int bit_pos;
f2fs_hash_t name_hash;
size_t namelen = name->len;
struct f2fs_inline_dentry *dentry_blk = NULL;
struct f2fs_dentry_ptr d;
int slots = GET_DENTRY_SLOTS(namelen);
struct page *page = NULL;
int err = 0;
ipage = get_node_page(sbi, dir->i_ino);
if (IS_ERR(ipage))
return PTR_ERR(ipage);
dentry_blk = inline_data_addr(ipage);
bit_pos = room_for_filename(&dentry_blk->dentry_bitmap,
slots, NR_INLINE_DENTRY);
if (bit_pos >= NR_INLINE_DENTRY) {
err = f2fs_convert_inline_dir(dir, ipage, dentry_blk);
if (!err)
err = -EAGAIN;
goto out;
}
if (inode) {
down_write(&F2FS_I(inode)->i_sem);
page = init_inode_metadata(inode, dir, name, ipage);
if (IS_ERR(page)) {
err = PTR_ERR(page);
goto fail;
}
}
f2fs_wait_on_page_writeback(ipage, NODE);
name_hash = f2fs_dentry_hash(name);
make_dentry_ptr(NULL, &d, (void *)dentry_blk, 2);
f2fs_update_dentry(ino, mode, &d, name, name_hash, bit_pos);
set_page_dirty(ipage);
/* we don't need to mark_inode_dirty now */
if (inode) {
F2FS_I(inode)->i_pino = dir->i_ino;
update_inode(inode, page);
f2fs_put_page(page, 1);
}
update_parent_metadata(dir, inode, 0);
fail:
if (inode)
up_write(&F2FS_I(inode)->i_sem);
if (is_inode_flag_set(F2FS_I(dir), FI_UPDATE_DIR)) {
update_inode(dir, ipage);
clear_inode_flag(F2FS_I(dir), FI_UPDATE_DIR);
}
out:
f2fs_put_page(ipage, 1);
return err;
}
static int f2fs_readdir(struct file *file, void *dirent, filldir_t filldir)
{
unsigned long pos = file->f_pos;
unsigned char *types = NULL;
unsigned int bit_pos = 0, start_bit_pos = 0;
int over = 0;
struct inode *inode = file_inode(file);
unsigned long npages = dir_blocks(inode);
struct f2fs_dentry_block *dentry_blk = NULL;
struct f2fs_dir_entry *de = NULL;
struct page *dentry_page = NULL;
unsigned int n = 0;
unsigned char d_type = DT_UNKNOWN;
int slots;
types = f2fs_filetype_table;
bit_pos = (pos % NR_DENTRY_IN_BLOCK);
n = (pos / NR_DENTRY_IN_BLOCK);
for ( ; n < npages; n++) {
dentry_page = get_lock_data_page(inode, n);
if (IS_ERR(dentry_page))
continue;
start_bit_pos = bit_pos;
dentry_blk = kmap(dentry_page);
while (bit_pos < NR_DENTRY_IN_BLOCK) {
d_type = DT_UNKNOWN;
bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap,
NR_DENTRY_IN_BLOCK,
bit_pos);
if (bit_pos >= NR_DENTRY_IN_BLOCK)
break;
de = &dentry_blk->dentry[bit_pos];
if (types && de->file_type < F2FS_FT_MAX)
d_type = types[de->file_type];
over = filldir(dirent,
dentry_blk->filename[bit_pos],
le16_to_cpu(de->name_len),
(n * NR_DENTRY_IN_BLOCK) + bit_pos,
le32_to_cpu(de->ino), d_type);
if (over) {
file->f_pos += bit_pos - start_bit_pos;
goto stop;
}
slots = GET_DENTRY_SLOTS(le16_to_cpu(de->name_len));
bit_pos += slots;
}
bit_pos = 0;
file->f_pos = (n + 1) * NR_DENTRY_IN_BLOCK;
kunmap(dentry_page);
f2fs_put_page(dentry_page, 1);
dentry_page = NULL;
}
stop:
if (dentry_page && !IS_ERR(dentry_page)) {
kunmap(dentry_page);
f2fs_put_page(dentry_page, 1);
}
return 0;
}
int convert_inline_dentry(struct f2fs_sb_info *sbi, struct f2fs_node *node,
block_t p_blkaddr)
{
struct f2fs_inode *inode = &(node->i);
unsigned int dir_level = node->i.i_dir_level;
nid_t ino = le32_to_cpu(node->footer.ino);
char inline_data[MAX_INLINE_DATA(node)];
struct dnode_of_data dn;
struct f2fs_dentry_ptr d;
unsigned long bit_pos = 0;
int ret = 0;
if (!(inode->i_inline & F2FS_INLINE_DENTRY))
return 0;
memcpy(inline_data, inline_data_addr(node), MAX_INLINE_DATA(node));
memset(inline_data_addr(node), 0, MAX_INLINE_DATA(node));
inode->i_inline &= ~F2FS_INLINE_DENTRY;
ret = dev_write_block(node, p_blkaddr);
ASSERT(ret >= 0);
memset(&dn, 0, sizeof(dn));
if (!dir_level) {
struct f2fs_dentry_block *dentry_blk;
struct f2fs_dentry_ptr src, dst;
dentry_blk = calloc(BLOCK_SZ, 1);
ASSERT(dentry_blk);
set_new_dnode(&dn, node, NULL, ino);
get_dnode_of_data(sbi, &dn, 0, ALLOC_NODE);
if (dn.data_blkaddr == NULL_ADDR)
new_data_block(sbi, dentry_blk, &dn, CURSEG_HOT_DATA);
make_dentry_ptr(&src, node, (void *)inline_data, 2);
make_dentry_ptr(&dst, NULL, (void *)dentry_blk, 1);
/* copy data from inline dentry block to new dentry block */
memcpy(dst.bitmap, src.bitmap, src.nr_bitmap);
memset(dst.bitmap + src.nr_bitmap, 0,
dst.nr_bitmap - src.nr_bitmap);
memcpy(dst.dentry, src.dentry, SIZE_OF_DIR_ENTRY * src.max);
memcpy(dst.filename, src.filename, src.max * F2FS_SLOT_LEN);
ret = dev_write_block(dentry_blk, dn.data_blkaddr);
ASSERT(ret >= 0);
MSG(1, "%s: copy inline entry to block\n", __func__);
free(dentry_blk);
return ret;
}
make_empty_dir(sbi, node);
make_dentry_ptr(&d, node, (void *)inline_data, 2);
while (bit_pos < (unsigned long)d.max) {
struct f2fs_dir_entry *de;
const unsigned char *filename;
int namelen;
if (!test_bit_le(bit_pos, d.bitmap)) {
bit_pos++;
continue;
}
de = &d.dentry[bit_pos];
if (!de->name_len) {
bit_pos++;
continue;
}
filename = d.filename[bit_pos];
namelen = le32_to_cpu(de->name_len);
if (is_dot_dotdot(filename, namelen)) {
bit_pos += GET_DENTRY_SLOTS(namelen);
continue;
}
ret = f2fs_add_link(sbi, node, filename, namelen,
le32_to_cpu(de->ino),
de->file_type, p_blkaddr, 0);
if (ret)
MSG(0, "Convert file \"%s\" ERR=%d\n", filename, ret);
else
MSG(1, "%s: add inline entry to block\n", __func__);
bit_pos += GET_DENTRY_SLOTS(namelen);
}
return 0;
}
/*
* f2fs_add_link - Add a new file(dir) to parent dir.
*/
int f2fs_add_link(struct f2fs_sb_info *sbi, struct f2fs_node *parent,
const unsigned char *name, int name_len, nid_t ino,
int file_type, block_t p_blkaddr, int inc_link)
{
int level = 0, current_depth, bit_pos;
int nbucket, nblock, bidx, block;
int slots = GET_DENTRY_SLOTS(name_len);
f2fs_hash_t dentry_hash = f2fs_dentry_hash(name, name_len);
struct f2fs_dentry_block *dentry_blk;
struct f2fs_dentry_ptr d;
struct dnode_of_data dn;
nid_t pino = le32_to_cpu(parent->footer.ino);
unsigned int dir_level = parent->i.i_dir_level;
int ret;
if (parent == NULL)
return -EINVAL;
if (!pino) {
ERR_MSG("Wrong parent ino:%d \n", pino);
return -EINVAL;
}
dentry_blk = calloc(BLOCK_SZ, 1);
ASSERT(dentry_blk);
current_depth = le32_to_cpu(parent->i.i_current_depth);
start:
if (current_depth == MAX_DIR_HASH_DEPTH) {
free(dentry_blk);
ERR_MSG("\tError: MAX_DIR_HASH\n");
return -ENOSPC;
}
/* Need a new dentry block */
if (level == current_depth)
++current_depth;
nbucket = dir_buckets(level, dir_level);
nblock = bucket_blocks(level);
bidx = dir_block_index(level, dir_level, le32_to_cpu(dentry_hash) % nbucket);
memset(&dn, 0, sizeof(dn));
for (block = bidx; block <= (bidx + nblock - 1); block++) {
/* Firstly, we should know the direct node of target data blk */
if (dn.node_blk && dn.node_blk != dn.inode_blk)
free(dn.node_blk);
set_new_dnode(&dn, parent, NULL, pino);
get_dnode_of_data(sbi, &dn, block, ALLOC_NODE);
if (dn.data_blkaddr == NULL_ADDR) {
new_data_block(sbi, dentry_blk, &dn, CURSEG_HOT_DATA);
} else {
ret = dev_read_block(dentry_blk, dn.data_blkaddr);
ASSERT(ret >= 0);
}
bit_pos = room_for_filename(dentry_blk->dentry_bitmap,
slots, NR_DENTRY_IN_BLOCK);
if (bit_pos < NR_DENTRY_IN_BLOCK)
goto add_dentry;
}
level ++;
goto start;
add_dentry:
make_dentry_ptr(&d, NULL, (void *)dentry_blk, 1);
f2fs_update_dentry(ino, file_type, &d, name, name_len, dentry_hash, bit_pos);
ret = dev_write_block(dentry_blk, dn.data_blkaddr);
ASSERT(ret >= 0);
/*
* Parent inode needs updating, because its inode info may be changed.
* such as i_current_depth and i_blocks.
*/
if (parent->i.i_current_depth != cpu_to_le32(current_depth)) {
parent->i.i_current_depth = cpu_to_le32(current_depth);
dn.idirty = 1;
}
/* Update parent's i_links info*/
if (inc_link && (file_type == F2FS_FT_DIR)){
u32 links = le32_to_cpu(parent->i.i_links);
parent->i.i_links = cpu_to_le32(links + 1);
dn.idirty = 1;
}
if ((__u64)((block + 1) * F2FS_BLKSIZE) >
le64_to_cpu(parent->i.i_size)) {
parent->i.i_size = cpu_to_le64((block + 1) * F2FS_BLKSIZE);
dn.idirty = 1;
}
if (dn.ndirty) {
ret = dev_write_block(dn.node_blk, dn.node_blkaddr);
ASSERT(ret >= 0);
}
if (dn.idirty) {
ASSERT(parent == dn.inode_blk);
ret = dev_write_block(dn.inode_blk, p_blkaddr);
ASSERT(ret >= 0);
}
if (dn.node_blk != dn.inode_blk)
free(dn.node_blk);
free(dentry_blk);
return 0;
}
int f2fs_add_inline_entry(struct inode *dir, const struct qstr *name,
struct inode *inode)
{
struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
struct page *ipage;
unsigned int bit_pos;
f2fs_hash_t name_hash;
struct f2fs_dir_entry *de;
size_t namelen = name->len;
struct f2fs_inline_dentry *dentry_blk = NULL;
int slots = GET_DENTRY_SLOTS(namelen);
struct page *page;
int err = 0;
int i;
name_hash = f2fs_dentry_hash(name);
ipage = get_node_page(sbi, dir->i_ino);
if (IS_ERR(ipage))
return PTR_ERR(ipage);
dentry_blk = inline_data_addr(ipage);
bit_pos = room_for_filename(&dentry_blk->dentry_bitmap,
slots, NR_INLINE_DENTRY);
if (bit_pos >= NR_INLINE_DENTRY) {
err = f2fs_convert_inline_dir(dir, ipage, dentry_blk);
if (!err)
err = -EAGAIN;
goto out;
}
down_write(&F2FS_I(inode)->i_sem);
page = init_inode_metadata(inode, dir, name, ipage);
if (IS_ERR(page)) {
err = PTR_ERR(page);
goto fail;
}
f2fs_wait_on_page_writeback(ipage, NODE);
de = &dentry_blk->dentry[bit_pos];
de->hash_code = name_hash;
de->name_len = cpu_to_le16(namelen);
memcpy(dentry_blk->filename[bit_pos], name->name, name->len);
de->ino = cpu_to_le32(inode->i_ino);
set_de_type(de, inode);
for (i = 0; i < slots; i++)
test_and_set_bit_le(bit_pos + i, &dentry_blk->dentry_bitmap);
set_page_dirty(ipage);
/* we don't need to mark_inode_dirty now */
F2FS_I(inode)->i_pino = dir->i_ino;
update_inode(inode, page);
f2fs_put_page(page, 1);
update_parent_metadata(dir, inode, 0);
fail:
up_write(&F2FS_I(inode)->i_sem);
if (is_inode_flag_set(F2FS_I(dir), FI_UPDATE_DIR)) {
update_inode(dir, ipage);
clear_inode_flag(F2FS_I(dir), FI_UPDATE_DIR);
}
out:
f2fs_put_page(ipage, 1);
return err;
}
int f2fs_add_inline_entry(struct inode *dir, const struct qstr *new_name,
const struct qstr *orig_name,
struct inode *inode, nid_t ino, umode_t mode)
{
struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
struct page *ipage;
unsigned int bit_pos;
f2fs_hash_t name_hash;
struct f2fs_inline_dentry *inline_dentry = NULL;
struct f2fs_dentry_ptr d;
int slots = GET_DENTRY_SLOTS(new_name->len);
struct page *page = NULL;
int err = 0;
ipage = get_node_page(sbi, dir->i_ino);
if (IS_ERR(ipage))
return PTR_ERR(ipage);
inline_dentry = inline_data_addr(ipage);
bit_pos = room_for_filename(&inline_dentry->dentry_bitmap,
slots, NR_INLINE_DENTRY);
if (bit_pos >= NR_INLINE_DENTRY) {
err = f2fs_convert_inline_dir(dir, ipage, inline_dentry);
if (err)
return err;
err = -EAGAIN;
goto out;
}
if (inode) {
down_write(&F2FS_I(inode)->i_sem);
page = init_inode_metadata(inode, dir, new_name,
orig_name, ipage);
if (IS_ERR(page)) {
err = PTR_ERR(page);
goto fail;
}
}
f2fs_wait_on_page_writeback(ipage, NODE, true);
name_hash = f2fs_dentry_hash(new_name, NULL);
make_dentry_ptr_inline(NULL, &d, inline_dentry);
f2fs_update_dentry(ino, mode, &d, new_name, name_hash, bit_pos);
set_page_dirty(ipage);
/* we don't need to mark_inode_dirty now */
if (inode) {
f2fs_i_pino_write(inode, dir->i_ino);
f2fs_put_page(page, 1);
}
update_parent_metadata(dir, inode, 0);
fail:
if (inode)
up_write(&F2FS_I(inode)->i_sem);
out:
f2fs_put_page(ipage, 1);
return err;
}
/*
* It only removes the dentry from the dentry page,corresponding name
* entry in name page does not need to be touched during deletion.
*/
void f2fs_delete_entry(struct f2fs_dir_entry *dentry, struct page *page,
struct inode *inode)
{
struct f2fs_dentry_block *dentry_blk;
unsigned int bit_pos;
struct address_space *mapping = page->mapping;
struct inode *dir = mapping->host;
struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
int slots = GET_DENTRY_SLOTS(le16_to_cpu(dentry->name_len));
void *kaddr = page_address(page);
int i;
mutex_lock_op(sbi, DENTRY_OPS);
lock_page(page);
wait_on_page_writeback(page);
dentry_blk = (struct f2fs_dentry_block *)kaddr;
bit_pos = dentry - (struct f2fs_dir_entry *)dentry_blk->dentry;
for (i = 0; i < slots; i++)
test_and_clear_bit_le(bit_pos + i, &dentry_blk->dentry_bitmap);
/* Let's check and deallocate this dentry page */
bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap,
NR_DENTRY_IN_BLOCK,
0);
kunmap(page); /* kunmap - pair of f2fs_find_entry */
set_page_dirty(page);
dir->i_ctime = dir->i_mtime = CURRENT_TIME;
if (inode && S_ISDIR(inode->i_mode)) {
drop_nlink(dir);
f2fs_write_inode(dir, NULL);
} else {
mark_inode_dirty(dir);
}
if (inode) {
inode->i_ctime = CURRENT_TIME;
drop_nlink(inode);
if (S_ISDIR(inode->i_mode)) {
drop_nlink(inode);
i_size_write(inode, 0);
}
f2fs_write_inode(inode, NULL);
if (inode->i_nlink == 0)
add_orphan_inode(sbi, inode->i_ino);
}
if (bit_pos == NR_DENTRY_IN_BLOCK) {
truncate_hole(dir, page->index, page->index + 1);
clear_page_dirty_for_io(page);
ClearPageUptodate(page);
dec_page_count(sbi, F2FS_DIRTY_DENTS);
inode_dec_dirty_dents(dir);
}
f2fs_put_page(page, 1);
mutex_unlock_op(sbi, DENTRY_OPS);
}
int __f2fs_add_link(struct inode *dir, const struct qstr *name, struct inode *inode)
{
unsigned int bit_pos;
unsigned int level;
unsigned int current_depth;
unsigned long bidx, block;
f2fs_hash_t dentry_hash;
struct f2fs_dir_entry *de;
unsigned int nbucket, nblock;
struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
size_t namelen = name->len;
struct page *dentry_page = NULL;
struct f2fs_dentry_block *dentry_blk = NULL;
int slots = GET_DENTRY_SLOTS(namelen);
int err = 0;
int i;
dentry_hash = f2fs_dentry_hash(name->name, name->len);
level = 0;
current_depth = F2FS_I(dir)->i_current_depth;
if (F2FS_I(dir)->chash == dentry_hash) {
level = F2FS_I(dir)->clevel;
F2FS_I(dir)->chash = 0;
}
start:
if (current_depth == MAX_DIR_HASH_DEPTH)
return -ENOSPC;
/* Increase the depth, if required */
if (level == current_depth)
++current_depth;
nbucket = dir_buckets(level);
nblock = bucket_blocks(level);
bidx = dir_block_index(level, (le32_to_cpu(dentry_hash) % nbucket));
for (block = bidx; block <= (bidx + nblock - 1); block++) {
mutex_lock_op(sbi, DENTRY_OPS);
dentry_page = get_new_data_page(dir, block, true);
if (IS_ERR(dentry_page)) {
mutex_unlock_op(sbi, DENTRY_OPS);
return PTR_ERR(dentry_page);
}
dentry_blk = kmap(dentry_page);
bit_pos = room_for_filename(dentry_blk, slots);
if (bit_pos < NR_DENTRY_IN_BLOCK)
goto add_dentry;
kunmap(dentry_page);
f2fs_put_page(dentry_page, 1);
mutex_unlock_op(sbi, DENTRY_OPS);
}
/* Move to next level to find the empty slot for new dentry */
++level;
goto start;
add_dentry:
err = init_inode_metadata(inode, dir, name);
if (err)
goto fail;
wait_on_page_writeback(dentry_page);
de = &dentry_blk->dentry[bit_pos];
de->hash_code = dentry_hash;
de->name_len = cpu_to_le16(namelen);
memcpy(dentry_blk->filename[bit_pos], name->name, name->len);
de->ino = cpu_to_le32(inode->i_ino);
set_de_type(de, inode);
for (i = 0; i < slots; i++)
test_and_set_bit_le(bit_pos + i, &dentry_blk->dentry_bitmap);
set_page_dirty(dentry_page);
update_parent_metadata(dir, inode, current_depth);
/* update parent inode number before releasing dentry page */
F2FS_I(inode)->i_pino = dir->i_ino;
fail:
kunmap(dentry_page);
f2fs_put_page(dentry_page, 1);
mutex_unlock_op(sbi, DENTRY_OPS);
return err;
}
