struct inode *hmfs_make_dentry(struct inode *dir, struct dentry *dentry,
umode_t mode)
{
struct super_block *sb = dir->i_sb;
struct hmfs_sb_info *sbi = HMFS_SB(sb);
struct inode *inode;
int err = 0, ilock;
ilock = mutex_lock_op(sbi);
inode = hmfs_new_inode(dir, mode);
if (IS_ERR(inode)) {
mutex_unlock_op(sbi, ilock);
return inode;
}
err = hmfs_add_link(dentry, inode);
mutex_unlock_op(sbi, ilock);
if (err)
goto out;
return inode;
out:
clear_nlink(inode);
unlock_new_inode(inode);
make_bad_inode(inode);
iput(inode);
alloc_nid_failed(sbi, inode->i_ino);
return ERR_PTR(err);
}
int f2fs_write_inode(struct inode *inode, struct writeback_control *wbc)
{
struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
int ret, ilock;
if (inode->i_ino == F2FS_NODE_INO(sbi) ||
inode->i_ino == F2FS_META_INO(sbi))
return 0;
if (!is_inode_flag_set(F2FS_I(inode), FI_DIRTY_INODE))
return 0;
/*
* We need to lock here to prevent from producing dirty node pages
* during the urgent cleaning time when runing out of free sections.
*/
ilock = mutex_lock_op(sbi);
ret = update_inode_page(inode);
mutex_unlock_op(sbi, ilock);
if (wbc)
f2fs_balance_fs(sbi);
return ret;
}
int hmfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
{
struct inode *inode;
struct hmfs_sb_info *sbi = HMFS_SB(dir->i_sb);
void *data_blk;
size_t symlen = strlen(symname) + 1;
int ilock;
if (symlen > HMFS_MAX_SYMLINK_NAME_LEN)
return -ENAMETOOLONG;
ilock = mutex_lock_op(sbi);
inode = hmfs_make_dentry(dir, dentry, S_IFLNK | S_IRWXUGO);
if (IS_ERR(inode))
return PTR_ERR(inode);
inode->i_op = &hmfs_symlink_inode_operations;
inode->i_mapping->a_ops = &hmfs_dblock_aops;
data_blk = alloc_new_data_block(inode, 0);
if (IS_ERR(data_blk))
return PTR_ERR(data_blk);
hmfs_memcpy(data_blk, (void *)symname, symlen);
mutex_unlock_op(sbi, ilock);
d_instantiate(dentry, inode);
unlock_new_inode(inode);
return 0;
}
/*
* Called at the last iput() if i_nlink is zero
*/
void f2fs_evict_inode(struct inode *inode)
{
struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
int ilock;
trace_f2fs_evict_inode(inode);
truncate_inode_pages(&inode->i_data, 0);
if (inode->i_ino == F2FS_NODE_INO(sbi) ||
inode->i_ino == F2FS_META_INO(sbi))
goto no_delete;
BUG_ON(atomic_read(&F2FS_I(inode)->dirty_dents));
remove_dirty_dir_inode(inode);
if (inode->i_nlink || is_bad_inode(inode))
goto no_delete;
set_inode_flag(F2FS_I(inode), FI_NO_ALLOC);
i_size_write(inode, 0);
if (F2FS_HAS_BLOCKS(inode))
f2fs_truncate(inode);
ilock = mutex_lock_op(sbi);
remove_inode_page(inode);
mutex_unlock_op(sbi, ilock);
no_delete:
end_writeback(inode);
}
ssize_t hmfs_xip_file_write(struct file * filp, const char __user * buf,
size_t len, loff_t * ppos)
{
struct address_space *mapping = filp->f_mapping;
struct inode *inode = filp->f_inode;
struct hmfs_sb_info *sbi = HMFS_SB(inode->i_sb);
size_t count = 0, ret;
loff_t pos;
int ilock;
mutex_lock(&inode->i_mutex);
if (!access_ok(VERIFY_READ, buf, len)) {
ret = -EFAULT;
goto out_up;
}
pos = *ppos;
count = len;
current->backing_dev_info = mapping->backing_dev_info;
ret = generic_write_checks(filp, &pos, &count, S_ISBLK(inode->i_mode));
if (ret)
goto out_backing;
if (count == 0)
goto out_backing;
ret = file_remove_suid(filp);
if (ret)
goto out_backing;
ret = file_update_time(filp);
if (ret)
goto out_backing;
inode->i_ctime = inode->i_mtime = CURRENT_TIME_SEC;
ilock = mutex_lock_op(sbi);
ret = __hmfs_xip_file_write(filp, buf, count, pos, ppos);
mutex_unlock_op(sbi, ilock);
mark_inode_dirty(inode);
out_backing:
current->backing_dev_info = NULL;
out_up:
mutex_unlock(&inode->i_mutex);
return ret;
}
static void fill_zero(struct inode *inode, pgoff_t index, loff_t start,
loff_t len)
{
struct hmfs_sb_info *sbi = HMFS_SB(inode->i_sb);
int ilock;
if (!len)
return;
ilock = mutex_lock_op(sbi);
alloc_new_data_partial_block(inode, index, start, start + len, true);
mutex_unlock_op(sbi, ilock);
}
static int hmfs_setxattr(struct inode *inode, int index, const char *name,
const void *value, size_t size, int flags)
{
struct hmfs_sb_info *sbi = HMFS_I_SB(inode);
int err, ilock;
ilock = mutex_lock_op(sbi);
inode_write_lock(inode);
err = __hmfs_setxattr(inode, index, name, value, size, flags);
inode_write_unlock(inode);
mutex_unlock_op(sbi, ilock);
return err;
}
static int expand_inode_data(struct inode *inode, loff_t offset, loff_t len,
int mode)
{
pgoff_t index, pg_start, pg_end;
loff_t new_size = i_size_read(inode);
loff_t off_start, off_end;
struct dnode_of_data dn;
int ret, ilock;
struct hmfs_sb_info *sbi = HMFS_SB(inode->i_sb);
ret = inode_newsize_ok(inode, (len + offset));
if (ret)
return ret;
pg_start = ((u64) offset) >> HMFS_PAGE_SIZE_BITS;
pg_end = ((u64) offset + len) >> HMFS_PAGE_SIZE_BITS;
off_start = offset & (HMFS_PAGE_SIZE - 1);
off_end = (offset + len) & (HMFS_PAGE_SIZE - 1);
for (index = pg_start; index <= pg_end; index++) {
ilock = mutex_lock_op(sbi);
set_new_dnode(&dn, inode, NULL, NULL, 0);
ret = get_dnode_of_data(&dn, index, ALLOC_NODE);
mutex_unlock_op(sbi, ilock);
if (ret) {
break;
}
if (pg_start == pg_end)
new_size = offset + len;
else if (index == pg_start && off_start)
new_size = (index + 1) << HMFS_PAGE_SIZE_BITS;
else if (index == pg_end)
new_size = (index << HMFS_PAGE_SIZE_BITS) + off_end;
else
new_size += HMFS_PAGE_SIZE;
}
if (!(mode & FALLOC_FL_KEEP_SIZE) && i_size_read(inode) < new_size) {
mark_size_dirty(inode, new_size);
}
return ret;
}
int hmfs_setattr(struct dentry *dentry, struct iattr *attr)
{
struct inode *inode = dentry->d_inode;
struct hmfs_inode_info *fi = HMFS_I(inode);
struct posix_acl *acl;
int err = 0, ilock;
struct hmfs_sb_info *sbi = HMFS_I_SB(inode);
err = inode_change_ok(inode, attr);
if (err)
return err;
ilock = mutex_lock_op(sbi);
inode_write_lock(inode);
if ((attr->ia_valid & ATTR_SIZE) && attr->ia_size != i_size_read(inode)) {
truncate_setsize(inode, attr->ia_size);
hmfs_truncate(inode);
}
__setattr_copy(inode, attr);
if (attr->ia_valid & ATTR_MODE) {
acl = hmfs_get_acl(inode, ACL_TYPE_ACCESS);
if (!acl || IS_ERR(acl)) {
err = PTR_ERR(acl);
goto out;
}
err = posix_acl_chmod(&acl, GFP_KERNEL, inode->i_mode);
err = hmfs_set_acl(inode, acl, ACL_TYPE_ACCESS);
if (err || is_inode_flag_set(fi, FI_ACL_MODE)) {
inode->i_mode = fi->i_acl_mode;
clear_inode_flag(fi, FI_ACL_MODE);
}
}
out:
inode_write_unlock(inode);
mutex_unlock_op(sbi, ilock);
mark_inode_dirty(inode);
return err;
}
static int punch_hole(struct inode *inode, loff_t offset, loff_t len, int mode)
{
pgoff_t pg_start, pg_end;
loff_t off_start, off_end;
loff_t blk_start, blk_end;
int ret = 0, ilock;
struct hmfs_sb_info *sbi = HMFS_SB(inode->i_sb);
pg_start = ((u64) offset) >> HMFS_PAGE_SIZE_BITS;
pg_end = ((u64) offset + len) >> HMFS_PAGE_SIZE_BITS;
off_start = offset & (HMFS_PAGE_SIZE - 1);
off_end = (offset + len) & (HMFS_PAGE_SIZE - 1);
if (pg_start == pg_end) {
fill_zero(inode, pg_start, off_start, off_end - off_start);
} else {
if (off_start)
fill_zero(inode, pg_start++, off_start,
HMFS_PAGE_SIZE - off_start);
if (off_end)
fill_zero(inode, pg_end, 0, off_end);
if (pg_start < pg_end) {
blk_start = pg_start << HMFS_PAGE_SIZE_BITS;
blk_end = pg_end << HMFS_PAGE_SIZE_BITS;
//FIXME: need this in mmap?
//truncate_inode_pages_range(inode,blk_start,blk_end);
ilock = mutex_lock_op(sbi);
ret = truncate_hole(inode, pg_start, pg_end);
mutex_unlock_op(sbi, ilock);
}
}
if (!(mode & FALLOC_FL_KEEP_SIZE)
&& i_size_read(inode) <= (offset + len)) {
mark_size_dirty(inode, offset + len);
}
return ret;
}
void f2fs_set_link(struct inode *dir, struct f2fs_dir_entry *de,
struct page *page, struct inode *inode)
{
struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
mutex_lock_op(sbi, DENTRY_OPS);
lock_page(page);
wait_on_page_writeback(page);
de->ino = cpu_to_le32(inode->i_ino);
set_de_type(de, inode);
kunmap(page);
set_page_dirty(page);
dir->i_mtime = dir->i_ctime = CURRENT_TIME;
mark_inode_dirty(dir);
/* update parent inode number before releasing dentry page */
F2FS_I(inode)->i_pino = dir->i_ino;
f2fs_put_page(page, 1);
mutex_unlock_op(sbi, DENTRY_OPS);
}
static int hmfs_link(struct dentry *old_dentry, struct inode *dir,
struct dentry *dentry)
{
struct inode *inode = old_dentry->d_inode;
struct hmfs_sb_info *sbi = HMFS_I_SB(inode);
int err, ilock;
inode->i_ctime = CURRENT_TIME;
ihold(inode);
set_inode_flag(HMFS_I(inode), FI_INC_LINK);
ilock = mutex_lock_op(sbi);
err = hmfs_add_link(dentry, inode);
mutex_unlock_op(sbi, ilock);
if (err)
goto out;
d_instantiate(dentry, inode);
return 0;
out:
clear_inode_flag(HMFS_I(inode), FI_INC_LINK);
iput(inode);
return err;
}
static int truncate_blocks(struct inode *inode, u64 from)
{
struct dnode_of_data dn;
struct hmfs_sb_info *sbi = HMFS_SB(inode->i_sb);
int count, err;
u64 free_from;
int ilock;
free_from = (from + HMFS_PAGE_SIZE - 1) >> HMFS_PAGE_SIZE_BITS;
ilock = mutex_lock_op(sbi);
set_new_dnode(&dn, inode, NULL, NULL, 0);
err = get_dnode_of_data(&dn, free_from, LOOKUP_NODE);
if (err) {
goto free_next;
}
if (!dn.level)
count = NORMAL_ADDRS_PER_INODE;
else
count = ADDRS_PER_BLOCK;
count -= dn.ofs_in_node;
BUG_ON(count < 0);
if (dn.ofs_in_node || !dn.level) {
truncate_data_blocks_range(&dn, count);
free_from += count;
}
free_next:err = truncate_inode_blocks(inode, free_from);
truncate_partial_data_page(inode, from);
mutex_unlock_op(sbi, ilock);
return err;
}
static int hmfs_unlink(struct inode *dir, struct dentry *dentry)
{
struct super_block *sb = dir->i_sb;
struct hmfs_sb_info *sbi = HMFS_SB(sb);
struct inode *inode = dentry->d_inode;
struct hmfs_dir_entry *de;
struct hmfs_dentry_block *res_blk;
int err = -ENOENT;
int bidx, ofs_in_blk, ilock;
de = hmfs_find_entry(dir, &dentry->d_name, &bidx, &ofs_in_blk);
if (!de)
goto fail;
err = check_orphan_space(sbi);
if (err)
goto fail;
ilock = mutex_lock_op(sbi);
inode_write_lock(dir);
res_blk = get_dentry_block_for_write(dir, bidx);
if (IS_ERR(res_blk)) {
err = PTR_ERR(res_blk);
mutex_unlock_op(sbi, ilock);
goto fail;
}
de = &res_blk->dentry[ofs_in_blk];
hmfs_delete_entry(de, res_blk, dir, inode, bidx);
inode_write_unlock(dir);
mutex_unlock_op(sbi, ilock);
mark_inode_dirty(dir);
fail:
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_setxattr(struct inode *inode, int name_index, const char *name,
const void *value, size_t value_len, struct page *ipage)
{
struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
struct f2fs_inode_info *fi = F2FS_I(inode);
struct f2fs_xattr_header *header = NULL;
struct f2fs_xattr_entry *here, *last;
struct page *page;
void *base_addr;
int error, found, free, newsize;
size_t name_len;
char *pval;
int ilock;
if (name == NULL)
return -EINVAL;
if (value == NULL)
value_len = 0;
name_len = strlen(name);
if (name_len > F2FS_NAME_LEN || value_len > MAX_VALUE_LEN)
return -ERANGE;
f2fs_balance_fs(sbi);
ilock = mutex_lock_op(sbi);
if (!fi->i_xattr_nid) {
/* Allocate new attribute block */
struct dnode_of_data dn;
if (!alloc_nid(sbi, &fi->i_xattr_nid)) {
error = -ENOSPC;
goto exit;
}
set_new_dnode(&dn, inode, NULL, NULL, fi->i_xattr_nid);
mark_inode_dirty(inode);
page = new_node_page(&dn, XATTR_NODE_OFFSET, ipage);
if (IS_ERR(page)) {
alloc_nid_failed(sbi, fi->i_xattr_nid);
fi->i_xattr_nid = 0;
error = PTR_ERR(page);
goto exit;
}
alloc_nid_done(sbi, fi->i_xattr_nid);
base_addr = page_address(page);
header = XATTR_HDR(base_addr);
header->h_magic = cpu_to_le32(F2FS_XATTR_MAGIC);
header->h_refcount = cpu_to_le32(1);
} else {
/* The inode already has an extended attribute block. */
page = get_node_page(sbi, fi->i_xattr_nid);
if (IS_ERR(page)) {
error = PTR_ERR(page);
goto exit;
}
base_addr = page_address(page);
header = XATTR_HDR(base_addr);
}
if (le32_to_cpu(header->h_magic) != F2FS_XATTR_MAGIC) {
error = -EIO;
goto cleanup;
}
/* find entry with wanted name. */
found = 0;
list_for_each_xattr(here, base_addr) {
if (here->e_name_index != name_index)
continue;
if (here->e_name_len != name_len)
continue;
if (!memcmp(here->e_name, name, name_len)) {
found = 1;
break;
}
}
last = here;
while (!IS_XATTR_LAST_ENTRY(last))
last = XATTR_NEXT_ENTRY(last);
newsize = XATTR_ALIGN(sizeof(struct f2fs_xattr_entry) +
name_len + value_len);
/* 1. Check space */
if (value) {
/* If value is NULL, it is remove operation.
* In case of update operation, we caculate free.
*/
free = MIN_OFFSET - ((char *)last - (char *)header);
if (found)
free = free - ENTRY_SIZE(here);
if (free < newsize) {
error = -ENOSPC;
goto cleanup;
}
}
/* 2. Remove old entry */
if (found) {
/* If entry is found, remove old entry.
* If not found, remove operation is not needed.
*/
struct f2fs_xattr_entry *next = XATTR_NEXT_ENTRY(here);
int oldsize = ENTRY_SIZE(here);
memmove(here, next, (char *)last - (char *)next);
last = (struct f2fs_xattr_entry *)((char *)last - oldsize);
memset(last, 0, oldsize);
}
/* 3. Write new entry */
if (value) {
/* Before we come here, old entry is removed.
* We just write new entry. */
memset(last, 0, newsize);
last->e_name_index = name_index;
last->e_name_len = name_len;
memcpy(last->e_name, name, name_len);
pval = last->e_name + name_len;
memcpy(pval, value, value_len);
last->e_value_size = cpu_to_le16(value_len);
}
set_page_dirty(page);
f2fs_put_page(page, 1);
if (is_inode_flag_set(fi, FI_ACL_MODE)) {
inode->i_mode = fi->i_acl_mode;
inode->i_ctime = CURRENT_TIME;
clear_inode_flag(fi, FI_ACL_MODE);
}
if (ipage)
update_inode(inode, ipage);
else
update_inode_page(inode);
mutex_unlock_op(sbi, ilock);
return 0;
cleanup:
f2fs_put_page(page, 1);
exit:
mutex_unlock_op(sbi, ilock);
return error;
}
int f2fs_setxattr(struct inode *inode, int name_index, const char *name,
const void *value, size_t value_len, struct page *ipage)
{
struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
struct f2fs_inode_info *fi = F2FS_I(inode);
struct f2fs_xattr_entry *here, *last;
void *base_addr;
int found, newsize;
size_t name_len;
int ilock;
__u32 new_hsize;
int error = -ENOMEM;
if (name == NULL)
return -EINVAL;
if (value == NULL)
value_len = 0;
name_len = strlen(name);
if (name_len > F2FS_NAME_LEN || value_len > MAX_VALUE_LEN(inode))
return -ERANGE;
f2fs_balance_fs(sbi);
ilock = mutex_lock_op(sbi);
base_addr = read_all_xattrs(inode, ipage);
if (!base_addr)
goto exit;
/* find entry with wanted name. */
here = __find_xattr(base_addr, name_index, name_len, name);
found = IS_XATTR_LAST_ENTRY(here) ? 0 : 1;
last = here;
while (!IS_XATTR_LAST_ENTRY(last))
last = XATTR_NEXT_ENTRY(last);
newsize = XATTR_ALIGN(sizeof(struct f2fs_xattr_entry) +
name_len + value_len);
/* 1. Check space */
if (value) {
int free;
/*
* If value is NULL, it is remove operation.
* In case of update operation, we caculate free.
*/
free = MIN_OFFSET(inode) - ((char *)last - (char *)base_addr);
if (found)
free = free - ENTRY_SIZE(here);
if (free < newsize) {
error = -ENOSPC;
goto exit;
}
}
/* 2. Remove old entry */
if (found) {
/*
* If entry is found, remove old entry.
* If not found, remove operation is not needed.
*/
struct f2fs_xattr_entry *next = XATTR_NEXT_ENTRY(here);
int oldsize = ENTRY_SIZE(here);
memmove(here, next, (char *)last - (char *)next);
last = (struct f2fs_xattr_entry *)((char *)last - oldsize);
memset(last, 0, oldsize);
}
new_hsize = (char *)last - (char *)base_addr;
/* 3. Write new entry */
if (value) {
char *pval;
/*
* Before we come here, old entry is removed.
* We just write new entry.
*/
memset(last, 0, newsize);
last->e_name_index = name_index;
last->e_name_len = name_len;
memcpy(last->e_name, name, name_len);
pval = last->e_name + name_len;
memcpy(pval, value, value_len);
last->e_value_size = cpu_to_le16(value_len);
new_hsize += newsize;
}
error = write_all_xattrs(inode, new_hsize, base_addr, ipage);
if (error)
goto exit;
if (is_inode_flag_set(fi, FI_ACL_MODE)) {
inode->i_mode = fi->i_acl_mode;
inode->i_ctime = CURRENT_TIME;
clear_inode_flag(fi, FI_ACL_MODE);
}
if (ipage)
update_inode(inode, ipage);
else
update_inode_page(inode);
exit:
mutex_unlock_op(sbi, ilock);
kzfree(base_addr);
return error;
}
static int hmfs_rename(struct inode *old_dir, struct dentry *old_dentry,
struct inode *new_dir, struct dentry *new_dentry)
{
struct super_block *sb = old_dir->i_sb;
struct hmfs_sb_info *sbi = HMFS_SB(sb);
struct inode *old_inode = old_dentry->d_inode;
struct inode *new_inode = new_dentry->d_inode;
struct hmfs_dentry_block *old_dentry_blk, *new_dentry_blk;
struct hmfs_dir_entry *old_dir_entry = NULL, *old_entry, *new_entry;
int err = -ENOENT, ilock;
int new_ofs, new_bidx, old_bidx, old_ofs;
old_entry = hmfs_find_entry(old_dir, &old_dentry->d_name, &old_bidx,
&old_ofs);
if (!old_entry)
goto out;
ilock = mutex_lock_op(sbi);
if (S_ISDIR(old_inode->i_mode)) {
err = -EIO;
// .. in hmfs_dentry_block of old_inode
old_dir_entry = hmfs_parent_dir(old_inode);
if (!old_dir_entry)
goto out_k;
}
inode_write_lock(new_dir);
if (new_inode) {
err = -ENOTEMPTY;
if (old_dir_entry && !hmfs_empty_dir(new_inode))
goto out_k;
err = -ENOENT;
new_entry = hmfs_find_entry(new_dir, &new_dentry->d_name, &new_bidx,
&new_ofs);
if (!new_entry)
goto out_k;
new_dentry_blk = get_dentry_block_for_write(new_dir, new_bidx);
if (IS_ERR(new_dentry_blk)) {
err = PTR_ERR(new_dentry_blk);
goto out_k;
}
new_entry = &new_dentry_blk->dentry[new_ofs];
hmfs_set_link(new_dir, new_entry, old_inode);
new_inode->i_ctime = CURRENT_TIME;
if (old_dir_entry)
drop_nlink(new_inode);
drop_nlink(new_inode);
if (!new_inode->i_nlink) {
err = check_orphan_space(sbi);
if (err)
goto out_k;
add_orphan_inode(sbi, new_inode->i_ino);
}
mark_inode_dirty(new_inode);
} else {
err = hmfs_add_link(new_dentry, old_inode);
if (err)
goto out_k;
if (old_dir_entry) {
inc_nlink(new_dir);
mark_inode_dirty(new_dir);
}
}
old_inode->i_ctime = CURRENT_TIME;
mark_inode_dirty(old_inode);
if (old_dir != new_dir)
inode_write_lock(old_dir);
old_dentry_blk = get_dentry_block_for_write(old_dir, old_bidx);
if (IS_ERR(old_dentry_blk)) {
err = PTR_ERR(old_dentry_blk);
goto unlock_old;
}
old_entry = &old_dentry_blk->dentry[old_ofs];
hmfs_delete_entry(old_entry, old_dentry_blk, old_dir, NULL,
old_bidx);
if (old_dir_entry) {
if (old_dir != new_dir) {
hmfs_set_link(old_inode, old_dir_entry, new_dir);
}
drop_nlink(old_dir);
mark_inode_dirty(old_dir);
}
unlock_old:
if (old_dir != new_dir)
inode_write_unlock(old_dir);
out_k:
inode_write_unlock(new_dir);
mutex_unlock_op(sbi, ilock);
out:
return err;
}
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;
}
static int f2fs_vm_page_mkwrite(struct vm_area_struct *vma,
struct vm_fault *vmf)
{
struct page *page = vmf->page;
struct inode *inode = file_inode(vma->vm_file);
struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
block_t old_blk_addr;
struct dnode_of_data dn;
int err, ilock;
f2fs_balance_fs(sbi);
/* F2FS backport: We replace in old kernels sb_start_pagefault(inode->i_sb) with vfs_check_frozen()
* and remove the original sb_end_pagefault(inode->i_sb) after the out label
*
* The introduction of sb_{start,end}_pagefault() was made post-3.2 kernels by Jan Kara
* and merged in commit a0e881b7c189fa2bd76c024dbff91e79511c971d.
* Discussed at https://lkml.org/lkml/2012/3/5/278
*
* - Alex
*/
vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE);
/* block allocation */
ilock = mutex_lock_op(sbi);
set_new_dnode(&dn, inode, NULL, NULL, 0);
err = get_dnode_of_data(&dn, page->index, ALLOC_NODE);
if (err) {
mutex_unlock_op(sbi, ilock);
goto out;
}
old_blk_addr = dn.data_blkaddr;
if (old_blk_addr == NULL_ADDR) {
err = reserve_new_block(&dn);
if (err) {
f2fs_put_dnode(&dn);
mutex_unlock_op(sbi, ilock);
goto out;
}
}
f2fs_put_dnode(&dn);
mutex_unlock_op(sbi, ilock);
file_update_time(vma->vm_file);
lock_page(page);
if (page->mapping != inode->i_mapping ||
page_offset(page) > i_size_read(inode) ||
!PageUptodate(page)) {
unlock_page(page);
err = -EFAULT;
goto out;
}
/*
* check to see if the page is mapped already (no holes)
*/
if (PageMappedToDisk(page))
goto mapped;
/* page is wholly or partially inside EOF */
if (((page->index + 1) << PAGE_CACHE_SHIFT) > i_size_read(inode)) {
unsigned offset;
offset = i_size_read(inode) & ~PAGE_CACHE_MASK;
zero_user_segment(page, offset, PAGE_CACHE_SIZE);
}
set_page_dirty(page);
SetPageUptodate(page);
mapped:
/* fill the page */
wait_on_page_writeback(page);
out:
return block_page_mkwrite_return(err);
}
