/* Primary function to update the seguse_table. Updates the segusage entry for
* the partiulcar segment.
*/
void segusetbl_update_entry(struct super_block *sb, int segnum,
struct segusage *seguse)
{
int offset;
sector_t newblock;
struct buffer_head *bh;
struct inode *inode = SEGUSETBL_INODE(sb);
struct segusage *pseguse = NULL;
if(is_new_segment(segnum, inode))
inode->i_size += LFS_SEGUSE_SIZE;
bh = segusetbl_read_entry(sb, segnum, &pseguse);
/* update the seguse_table */
if(bh) {
/* updating the in-memory contents */
//dprintk("Updating in-memory contents\n");
offset = LFS_CI_SIZE + LFS_SEGUSE_SIZE * segnum;
offset = offset % LFS_BSIZE;
//dprintk("Updating at offset = %d\n", offset);
newblock = segment_write_block_from_bh(
sb, seguse, LFS_SEGUSE_SIZE, offset, bh);
if(newblock != bh->b_blocknr)
update_inode(inode, get_iblock_nr(segnum), newblock);
brelse(bh);
}
else {
/* new seguse entry */
offset = 0;
newblock = segment_write_block( sb, seguse, LFS_SEGUSE_SIZE,
offset, 0);
update_inode(inode, get_iblock_nr(segnum), newblock);
//dprintk("updating %Lu to %Lu block\n", get_iblock_nr(segp), newblock);
}
mark_inode_dirty(inode);
}
bool recover_inline_data(struct inode *inode, struct page *npage)
{
struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
struct f2fs_inode *ri = NULL;
void *src_addr, *dst_addr;
struct page *ipage;
/*
* The inline_data recovery policy is as follows.
* [prev.] [next] of inline_data flag
* o o -> recover inline_data
* o x -> remove inline_data, and then recover data blocks
* x o -> remove inline_data, and then recover inline_data
* x x -> recover data blocks
*/
if (IS_INODE(npage))
ri = F2FS_INODE(npage);
if (f2fs_has_inline_data(inode) &&
ri && (ri->i_inline & F2FS_INLINE_DATA)) {
process_inline:
ipage = get_node_page(sbi, inode->i_ino);
f2fs_bug_on(sbi, IS_ERR(ipage));
f2fs_wait_on_page_writeback(ipage, NODE);
src_addr = inline_data_addr(npage);
dst_addr = inline_data_addr(ipage);
memcpy(dst_addr, src_addr, MAX_INLINE_DATA);
set_inode_flag(F2FS_I(inode), FI_INLINE_DATA);
set_inode_flag(F2FS_I(inode), FI_DATA_EXIST);
update_inode(inode, ipage);
f2fs_put_page(ipage, 1);
return true;
}
if (f2fs_has_inline_data(inode)) {
ipage = get_node_page(sbi, inode->i_ino);
f2fs_bug_on(sbi, IS_ERR(ipage));
truncate_inline_inode(ipage, 0);
f2fs_clear_inline_inode(inode);
update_inode(inode, ipage);
f2fs_put_page(ipage, 1);
} else if (ri && (ri->i_inline & F2FS_INLINE_DATA)) {
truncate_blocks(inode, 0, false);
goto process_inline;
}
return false;
}
void f2fs_drop_nlink(struct inode *dir, struct inode *inode, struct page *page)
{
struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
down_write(&F2FS_I(inode)->i_sem);
if (S_ISDIR(inode->i_mode)) {
drop_nlink(dir);
if (page)
update_inode(dir, page);
else
update_inode_page(dir);
}
inode->i_ctime = CURRENT_TIME;
drop_nlink(inode);
if (S_ISDIR(inode->i_mode)) {
drop_nlink(inode);
i_size_write(inode, 0);
}
up_write(&F2FS_I(inode)->i_sem);
update_inode_page(inode);
if (inode->i_nlink == 0)
add_orphan_inode(sbi, inode->i_ino);
else
release_orphan_inode(sbi);
}
int gen_inum(MFS_Header_t **header, int offset) {
int i, j, tmp_offset;
MFS_Imap_t *imap_temp;
void *block_ptr = (void *)(*header) + sizeof(MFS_Header_t);
i = 0;
while(i < 4096/ 14) {
if((*header)->map[i] == -1) {
imap_temp = allot_space(header, sizeof(MFS_Imap_t), &tmp_offset);
for(j = 0; j < 14; j++) {
imap_temp->inodes[j] = -1;
}
imap_temp->inodes[0] = offset;
(*header)->map[i] = tmp_offset;
return (i * 14) + 0;
} else {
imap_temp = (MFS_Imap_t *)(block_ptr + (*header)->map[i]);
for(j = 0; j < 14; j++) {
if(imap_temp->inodes[j] == -1) {
update_inode(header, (i * 14) + j, offset);
return (i * 14) + j;
}
}
}
i++;
}
return -1;
}
int recover_inline_data(struct inode *inode, struct page *npage)
{
struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
struct f2fs_inode *ri = NULL;
void *src_addr, *dst_addr;
struct page *ipage;
/*
* The inline_data recovery policy is as follows.
* [prev.] [next] of inline_data flag
* o o -> recover inline_data
* o x -> remove inline_data, and then recover data blocks
* x o -> remove inline_data, and then recover inline_data
* x x -> recover data blocks
*/
if (IS_INODE(npage))
ri = F2FS_INODE(npage);
if (f2fs_has_inline_data(inode) &&
ri && ri->i_inline & F2FS_INLINE_DATA) {
process_inline:
ipage = get_node_page(sbi, inode->i_ino);
f2fs_bug_on(IS_ERR(ipage));
src_addr = inline_data_addr(npage);
dst_addr = inline_data_addr(ipage);
memcpy(dst_addr, src_addr, MAX_INLINE_DATA);
update_inode(inode, ipage);
f2fs_put_page(ipage, 1);
return -1;
}
if (f2fs_has_inline_data(inode)) {
ipage = get_node_page(sbi, inode->i_ino);
f2fs_bug_on(IS_ERR(ipage));
zero_user_segment(ipage, INLINE_DATA_OFFSET,
INLINE_DATA_OFFSET + MAX_INLINE_DATA);
clear_inode_flag(F2FS_I(inode), FI_INLINE_DATA);
update_inode(inode, ipage);
f2fs_put_page(ipage, 1);
} else if (ri && ri->i_inline & F2FS_INLINE_DATA) {
truncate_blocks(inode, 0);
set_inode_flag(F2FS_I(inode), FI_INLINE_DATA);
goto process_inline;
}
return 0;
}
static int change_root_fmap (tree_s *tree, buf_s *root)
{
info_s *file = container(tree, info_s, in_tree);
int rc;
FN;
file->in_inode.i_root = root->b_blkno;
rc = update_inode( &file->in_inode);
return rc;
}
int update_inode_page(struct inode *inode)
{
struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
struct page *node_page;
node_page = get_node_page(sbi, inode->i_ino);
if (IS_ERR(node_page))
return PTR_ERR(node_page);
update_inode(inode, node_page);
f2fs_put_page(node_page, 1);
return 0;
}
void update_inode_page(struct inode *inode)
{
struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
struct page *node_page;
retry:
node_page = get_node_page(sbi, inode->i_ino);
if (IS_ERR(node_page)) {
int err = PTR_ERR(node_page);
if (err == -ENOMEM) {
cond_resched();
goto retry;
} else if (err != -ENOENT) {
f2fs_stop_checkpoint(sbi);
}
return;
}
update_inode(inode, node_page);
f2fs_put_page(node_page, 1);
}
int f2fs_do_tmpfile(struct inode *inode, struct inode *dir)
{
struct page *page;
int err = 0;
down_write(&F2FS_I(inode)->i_sem);
page = init_inode_metadata(inode, dir, NULL);
if (IS_ERR(page)) {
err = PTR_ERR(page);
goto fail;
}
/* we don't need to mark_inode_dirty now */
update_inode(inode, page);
f2fs_put_page(page, 1);
clear_inode_flag(F2FS_I(inode), FI_NEW_INODE);
fail:
up_write(&F2FS_I(inode)->i_sem);
return err;
}
/*
* 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;
}
static int __f2fs_setxattr(struct inode *inode, int index,
const char *name, const void *value, size_t size,
struct page *ipage, int flags)
{
struct f2fs_inode_info *fi = F2FS_I(inode);
struct f2fs_xattr_entry *here, *last;
void *base_addr;
int found, newsize;
size_t len;
__u32 new_hsize;
int error = -ENOMEM;
if (name == NULL)
return -EINVAL;
if (value == NULL)
size = 0;
len = strlen(name);
if (len > F2FS_NAME_LEN || size > MAX_VALUE_LEN(inode))
return -ERANGE;
base_addr = read_all_xattrs(inode, ipage);
if (!base_addr)
goto exit;
/* find entry with wanted name. */
here = __find_xattr(base_addr, index, len, name);
found = IS_XATTR_LAST_ENTRY(here) ? 0 : 1;
if ((flags & XATTR_REPLACE) && !found) {
error = -ENODATA;
goto exit;
} else if ((flags & XATTR_CREATE) && found) {
error = -EEXIST;
goto exit;
}
last = here;
while (!IS_XATTR_LAST_ENTRY(last))
last = XATTR_NEXT_ENTRY(last);
newsize = XATTR_ALIGN(sizeof(struct f2fs_xattr_entry) + len + size);
/* 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 (unlikely(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 = index;
last->e_name_len = len;
memcpy(last->e_name, name, len);
pval = last->e_name + len;
memcpy(pval, value, size);
last->e_value_size = cpu_to_le16(size);
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:
kzfree(base_addr);
return error;
}
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;
}
/* FIXME: Ugliest function of all in LFS, need I say more? */
static ssize_t lfs_file_write( struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
loff_t pos;
struct page *page;
ssize_t res, written, bytes;
struct inode *inode = file->f_dentry->d_inode;
struct super_block *sb = inode->i_sb;
struct segment *segp = LFS_SBI(sb)->s_curr;
//dprintk("lfs_file_write called for %lu at pos %Lu\n", inode->i_ino, *ppos);
if(file->f_flags & O_DIRECT) {
dprintk("The file is requesting direct IO\n");
return -EINVAL;
}
if (unlikely(count < 0 ))
return -EINVAL;
if (unlikely(!access_ok(VERIFY_READ, buf, count)))
return -EFAULT;
//down(&inode->i_sem); /* lock the file */
mutex_lock(&inode->i_mutex); //BrechREiZ: We need this for Kernel 2.6.17
lfs_lock(sb);
pos = *ppos;
res = generic_write_checks(file, &pos, &count, 0);
if (res)
goto out;
if(count == 0)
goto out;
res = remove_suid(file->f_dentry);
if(res)
goto out;
//inode_update_time(inode, 1); /* update mtime and ctime */
file_update_time(inode); //BrechREiZ: We need this for Kernel 2.6.17
written = 0;
do {
long offset;
size_t copied;
int i, siblock, eiblock, boffset;
sector_t block;
offset = (segp->offset % BUF_IN_PAGE) * LFS_BSIZE;
offset += pos & (LFS_BSIZE - 1); /* within block */
bytes = PAGE_CACHE_SIZE - offset; /* number of bytes written
in this iteration */
invalidate_old_page(inode, pos);
if (bytes > count)
bytes = count;
//dprintk("1:segp->start=%Lu,segp->offset=%d,segp->end=%Lu,offset=%lu,bytes=%d\n", segp->start, segp->offset, segp->end,offset,bytes);
siblock = pos >> LFS_BSIZE_BITS;
eiblock = (pos + bytes - 1) >> LFS_BSIZE_BITS;
//dprintk("writing %d bytes at offset %ld (pos = %Lu)\n", bytes, offset, pos);
//dprintk("siblock = %d, eiblock = %d\n", siblock, eiblock);
/*
* Bring in the user page that we will copy from _first_.
* Otherwise there's a nasty deadlock on copying from the
* same page as we're writing to, without it being marked
* up-to-date.
*/
fault_in_pages_readable(buf, bytes);
page = get_seg_page(segp);
if (!page) {
res = -ENOMEM;
break;
}
/* fill the page with current inode blocks if any */
boffset = offset / LFS_BSIZE;;
for(i = siblock; i <= eiblock; ++i, ++boffset) {
struct buffer_head *bh;
//dprintk("Asking for block %d\n", i);
bh = lfs_read_block(inode, i);
if(!bh) /* new block */
break;
//dprintk("boffset = %d\n", boffset);
memcpy(page_address(page) + LFS_BSIZE * boffset, bh->b_data, LFS_BSIZE);
brelse(bh);
}
copied = __copy_from_user(page_address(page) + offset, buf, bytes);
flush_dcache_page(page);
block = segp->start + segp->offset;
for(i = siblock;i <= eiblock; ++i, ++block)
segsum_update_finfo(segp, inode->i_ino, i, block);
block = segp->start + segp->offset;
segp->offset += (bytes - 1)/LFS_BSIZE + 1;
//dprintk("2:segp->start=%Lu,segp->offset=%d,segp->end=%Lu,offset=%lu,bytes=%d\n",
//segp->start, segp->offset, segp->end,offset,bytes);
BUG_ON(segp->start + segp->offset > segp->end);
if(segp->start + segp->offset == segp->end) {
dprintk("allocating new segment\n");
/* This also is going to write the previous segment */
segment_allocate_new(inode->i_sb, segp, segp->start + segp->offset);
segp = LFS_SBI(sb)->s_curr;
}
/* update the inode */
for(i = siblock;i <= eiblock; ++i, ++block)
update_inode(inode, i, block);
//dprintk("start=%Lu,offset=%d,end=%Lu\n", segp->start, segp->offset, segp->end);
segusetbl_add_livebytes(sb, segp->segnum, bytes);
written += bytes;
buf += bytes;
pos += bytes;
count -= bytes;
} while(count);
*ppos = pos;
if(pos > inode->i_size)
i_size_write(inode, pos);
if(written)
mark_inode_dirty(inode);
lfs_unlock(sb);
//up(&inode->i_sem);
mutex_unlock(&inode->i_mutex); //BrechREiZ: and unlocking...
return written ? written : res;
out:
lfs_unlock(sb);
//up(&inode->i_sem);
mutex_unlock(&inode->i_mutex); //BrechREiZ: and unlocking...
return res;
}
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;
}
struct inode *f2fs_iget_nowait(struct super_block *sb, unsigned long ino)
{
struct f2fs_iget_args args = {
.ino = ino,
.on_free = 0
};
struct inode *inode = ilookup5(sb, ino, f2fs_iget_test, &args);
if (inode)
return inode;
if (!args.on_free)
return f2fs_iget(sb, ino);
return ERR_PTR(-ENOENT);
}
static int do_read_inode(struct inode *inode)
{
struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
struct f2fs_inode_info *fi = F2FS_I(inode);
struct page *node_page;
struct f2fs_node *rn;
struct f2fs_inode *ri;
/* Check if ino is within scope */
check_nid_range(sbi, inode->i_ino);
node_page = get_node_page(sbi, inode->i_ino);
if (IS_ERR(node_page))
return PTR_ERR(node_page);
rn = page_address(node_page);
ri = &(rn->i);
inode->i_mode = le16_to_cpu(ri->i_mode);
i_uid_write(inode, le32_to_cpu(ri->i_uid));
i_gid_write(inode, le32_to_cpu(ri->i_gid));
set_nlink(inode, le32_to_cpu(ri->i_links));
inode->i_size = le64_to_cpu(ri->i_size);
inode->i_blocks = le64_to_cpu(ri->i_blocks);
inode->i_atime.tv_sec = le64_to_cpu(ri->i_atime);
inode->i_ctime.tv_sec = le64_to_cpu(ri->i_ctime);
inode->i_mtime.tv_sec = le64_to_cpu(ri->i_mtime);
inode->i_atime.tv_nsec = le32_to_cpu(ri->i_atime_nsec);
inode->i_ctime.tv_nsec = le32_to_cpu(ri->i_ctime_nsec);
inode->i_mtime.tv_nsec = le32_to_cpu(ri->i_mtime_nsec);
inode->i_generation = le32_to_cpu(ri->i_generation);
fi->i_current_depth = le32_to_cpu(ri->i_current_depth);
fi->i_xattr_nid = le32_to_cpu(ri->i_xattr_nid);
fi->i_flags = le32_to_cpu(ri->i_flags);
fi->flags = 0;
fi->data_version = le64_to_cpu(F2FS_CKPT(sbi)->checkpoint_ver) - 1;
fi->i_advise = ri->i_advise;
fi->i_pino = le32_to_cpu(ri->i_pino);
get_extent_info(&fi->ext, ri->i_ext);
f2fs_put_page(node_page, 1);
return 0;
}
struct inode *f2fs_iget(struct super_block *sb, unsigned long ino)
{
struct f2fs_sb_info *sbi = F2FS_SB(sb);
struct inode *inode;
int ret;
inode = iget_locked(sb, ino);
if (!inode)
return ERR_PTR(-ENOMEM);
if (!(inode->i_state & I_NEW))
return inode;
if (ino == F2FS_NODE_INO(sbi) || ino == F2FS_META_INO(sbi))
goto make_now;
ret = do_read_inode(inode);
if (ret)
goto bad_inode;
if (!sbi->por_doing && inode->i_nlink == 0) {
ret = -ENOENT;
goto bad_inode;
}
make_now:
if (ino == F2FS_NODE_INO(sbi)) {
inode->i_mapping->a_ops = &f2fs_node_aops;
mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_ZERO);
} else if (ino == F2FS_META_INO(sbi)) {
inode->i_mapping->a_ops = &f2fs_meta_aops;
mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_ZERO);
} else if (S_ISREG(inode->i_mode)) {
inode->i_op = &f2fs_file_inode_operations;
inode->i_fop = &f2fs_file_operations;
inode->i_mapping->a_ops = &f2fs_dblock_aops;
} else if (S_ISDIR(inode->i_mode)) {
inode->i_op = &f2fs_dir_inode_operations;
inode->i_fop = &f2fs_dir_operations;
inode->i_mapping->a_ops = &f2fs_dblock_aops;
mapping_set_gfp_mask(inode->i_mapping, GFP_HIGHUSER_MOVABLE |
__GFP_ZERO);
} else if (S_ISLNK(inode->i_mode)) {
inode->i_op = &f2fs_symlink_inode_operations;
inode->i_mapping->a_ops = &f2fs_dblock_aops;
} else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) ||
S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) {
inode->i_op = &f2fs_special_inode_operations;
init_special_inode(inode, inode->i_mode, inode->i_rdev);
} else {
ret = -EIO;
goto bad_inode;
}
unlock_new_inode(inode);
return inode;
bad_inode:
iget_failed(inode);
return ERR_PTR(ret);
}
void update_inode(struct inode *inode, struct page *node_page)
{
struct f2fs_node *rn;
struct f2fs_inode *ri;
wait_on_page_writeback(node_page);
rn = page_address(node_page);
ri = &(rn->i);
ri->i_mode = cpu_to_le16(inode->i_mode);
ri->i_advise = F2FS_I(inode)->i_advise;
ri->i_uid = cpu_to_le32(i_uid_read(inode));
ri->i_gid = cpu_to_le32(i_gid_read(inode));
ri->i_links = cpu_to_le32(inode->i_nlink);
ri->i_size = cpu_to_le64(i_size_read(inode));
ri->i_blocks = cpu_to_le64(inode->i_blocks);
set_raw_extent(&F2FS_I(inode)->ext, &ri->i_ext);
ri->i_atime = cpu_to_le64(inode->i_atime.tv_sec);
ri->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
ri->i_mtime = cpu_to_le64(inode->i_mtime.tv_sec);
ri->i_atime_nsec = cpu_to_le32(inode->i_atime.tv_nsec);
ri->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
ri->i_mtime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec);
ri->i_current_depth = cpu_to_le32(F2FS_I(inode)->i_current_depth);
ri->i_xattr_nid = cpu_to_le32(F2FS_I(inode)->i_xattr_nid);
ri->i_flags = cpu_to_le32(F2FS_I(inode)->i_flags);
ri->i_pino = cpu_to_le32(F2FS_I(inode)->i_pino);
ri->i_generation = cpu_to_le32(inode->i_generation);
set_cold_node(inode, node_page);
set_page_dirty(node_page);
}
int f2fs_write_inode(struct inode *inode, struct writeback_control *wbc)
{
struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
struct page *node_page;
bool need_lock = false;
if (inode->i_ino == F2FS_NODE_INO(sbi) ||
inode->i_ino == F2FS_META_INO(sbi))
return 0;
if (wbc)
f2fs_balance_fs(sbi);
node_page = get_node_page(sbi, inode->i_ino);
if (IS_ERR(node_page))
return PTR_ERR(node_page);
if (!PageDirty(node_page)) {
need_lock = true;
f2fs_put_page(node_page, 1);
mutex_lock(&sbi->write_inode);
node_page = get_node_page(sbi, inode->i_ino);
if (IS_ERR(node_page)) {
mutex_unlock(&sbi->write_inode);
return PTR_ERR(node_page);
}
}
update_inode(inode, node_page);
f2fs_put_page(node_page, 1);
if (need_lock)
mutex_unlock(&sbi->write_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);
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);
remove_inode_page(inode);
no_delete:
clear_inode(inode);
}
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;
}
uint8_t* ramdisk_init(){
int i;
uint8_t* ramdisk;
int root_bid;
struct rd_inode* root_inode;
struct rd_super_block* InitSuperBlock;
#ifdef UL_DEBUG
if(!(ramdisk=(uint8_t*)malloc(RAMDISK_SIZE*sizeof(uint8_t)))){
fprintf(stderr,"No sufficient mem space for ramdisk!\n");
exit(-1);
}
#endif
#ifndef UL_DEBUG
if(!(ramdisk=(uint8_t*)vmalloc(RAMDISK_SIZE*sizeof(uint8_t)))){
printk("<1> No sufficient mem space for ramdisk!\n");
return NULL;
}
#endif
//Nullify all the data in ramdisk
memset(ramdisk,0,RAMDISK_SIZE);
//Init the bitmap
for(i=0;i<=(BITMAP_LIMIT+1)/RD_BLOCK_SIZE;i++){
set_bitmap(ramdisk,i);
}
//Init the root directory
root_bid=find_next_free_block(ramdisk);//BlockNO for root dir
#ifdef UL_DEBUG
if(!(root_inode=(struct rd_inode*)malloc(sizeof(struct rd_inode)))){
fprintf(stderr, "No sufficient mem space for root dir!\n");
exit(-1);
}
#endif
#ifndef UL_DEBUG
if(!(root_inode=(struct rd_inode*)vmalloc(sizeof(struct rd_inode)))){
printk("<1> No sufficient mem space for root dir!\n");
return NULL;
}
#endif
root_inode->type=0;
root_inode->size=0;
root_inode->BlockPointer[0]=root_bid;
update_inode(ramdisk,0,root_inode);
//Init the superblock
#ifdef UL_DEBUG
if(!(InitSuperBlock=(struct rd_super_block*)malloc(sizeof(struct rd_super_block)))){
fprintf(stderr,"No sufficient mem\n");
exit(-1);
}
#endif
#ifndef UL_DEBUG
if(!(InitSuperBlock=(struct rd_super_block*)vmalloc(sizeof(struct rd_super_block)))){
printk("<1> No sufficient mem\n");
return NULL;
}
#endif
InitSuperBlock->FreeBlockNum=BLOCK_NUM-(BITMAP_LIMIT+1)/RD_BLOCK_SIZE;
InitSuperBlock->FreeInodeNum=INODE_NUM-1;//The root dir takes one inode
memset(InitSuperBlock->InodeBitmap,0,INODEBITMAP_SIZE);
update_superblock(ramdisk,InitSuperBlock);
//Init the inode bitmap in superblock
set_inode_bitmap(ramdisk,0);
#ifndef UL_DEBUG
vfree(root_inode);
#endif
return ramdisk;
}
int
main(int argc, char *argv[])
{
// check for correct arguments
if(argc != 3) {
fprintf(stderr, "Usage: %s <port> <file-system-image>\n", argv[0]);
exit(1);
}
int portnum = atoi(argv[1]);
char *fs_image = argv[2];
int sd = UDP_Open(portnum);
assert(sd > -1);
int fd = open(fs_image, O_RDWR|O_CREAT, S_IRWXU);
if(fd < 0) {
fprintf(stderr, "Cannot open file image");
exit(1);
}
struct stat file_stat;
if(fstat(fd, &file_stat) < 0) {
fprintf(stderr, "Cannot open file image");
exit(1);
}
int i, j, rc;
MFS_Header_t *header;
int image_size;
free_bytes = MFS_BYTE_STEP_SIZE;
int entry_offset, inode_offset, new_dir_offset, parent_inode_offset;
int tmp_offset, tmp_inode_offset, tmp_imap_offset;
int done = 0;
MFS_Imap_t *imap_temp;
MFS_Inode_t *inode_temp;
MFS_Inode_t *new_inode;
MFS_DirEnt_t *entry_temp;
if(file_stat.st_size >= sizeof(MFS_Header_t)) {
image_size = file_stat.st_size + MFS_BYTE_STEP_SIZE;
printf("Using old file of size %d\n", (int)file_stat.st_size);
header = (MFS_Header_t *)malloc(image_size);
// Put text in memory
rc = read(fd, header, file_stat.st_size);
if(rc < 0){
fprintf(stderr, "Cannot open file");
exit(1);
}
} else {
//Initialize
image_size = sizeof(MFS_Header_t) + MFS_BYTE_STEP_SIZE;
header = (MFS_Header_t *)malloc(image_size);
// root initialization
inode_temp = allot_space(&header, sizeof(MFS_Inode_t), &tmp_inode_offset);
imap_temp = allot_space(&header, sizeof(MFS_Imap_t), &tmp_imap_offset);
imap_temp->inodes[0] = tmp_inode_offset;
prepare_inode(inode_temp, MFS_DIRECTORY, NULL);
for (i = 0; i < 14; i++) {
imap_temp->inodes[i] = -1;
}
// header initialization
for (i = 0; i < 4096/14; i++) {
header->map[i] = -1;
}
imap_temp->inodes[0] = tmp_inode_offset;
// add two default entries
entry_temp = allot_space(&header, MFS_BLOCK_SIZE, &tmp_offset);
entry_temp[0].name[0] = '.';
entry_temp[0].name[1] = '\0';
entry_temp[0].inum = 0;
entry_temp[1].name[0] = '.';
entry_temp[1].name[1] = '.';
entry_temp[1].name[2] = '\0';
entry_temp[1].inum = 0;
for (i = 2; i < MFS_BLOCK_SIZE/sizeof(MFS_DirEnt_t); i++) {
entry_temp[i].inum = -1;
}
inode_temp->data[0] = tmp_offset;
//Write to disk
header->map[0] = tmp_imap_offset;
flush(fd);
write_header(fd, header);
printf("Initializing new file\n");
}
void* header_ptr = (void*)header;
void* block_ptr = header_ptr + sizeof(MFS_Header_t);
prot_r = (MFS_Prot_t*)malloc(sizeof(MFS_Prot_t));
printf("Started listening at port %d\n", portnum);
while (1) {
struct sockaddr_in s;
rc = UDP_Read(sd, &s, (char*)prot_r, sizeof(MFS_Prot_t));
if (rc > 0) {
//Special case for shutdown
if(prot_r->cmd == CMD_INIT){
printf("Server initialized\n");
prot_r->ret = 0;
} else if(prot_r->cmd == CMD_LOOKUP){
prot_r->ret = -1;
MFS_Inode_t* parent_inode = fix_inode(header, prot_r->pinum);
prot_r->ret = lookup(block_ptr, parent_inode, &(prot_r->datapacket[0]));
} else if(prot_r->cmd == CMD_SHUTDOWN){
//Close file
rc = close(fd);
if(rc < 0){
fprintf(stderr, "Cannot open file");
exit(1);
}
prot_r->ret = 0;
if(UDP_Write(sd, &s, (char*)prot_r, sizeof(MFS_Prot_t)) < -1){
fprintf(stderr, "Unable to send result");
exit(1);
}
exit(0);
} else if(prot_r->cmd == CMD_UNLINK){
verify(&header, &block_ptr, 16384);
prot_r->ret = -1;
MFS_Inode_t* parent_inode = fix_inode(header, prot_r->pinum);
if(parent_inode != NULL && parent_inode->type == MFS_DIRECTORY){
int exist = lookup(block_ptr, parent_inode, &(prot_r->datapacket[0]));
if(exist != -1){
//Check if empty
MFS_Inode_t* this_inode = fix_inode(header, exist);
if(!(this_inode->type == MFS_DIRECTORY && this_inode->size != 0)){
//Need to remove
MFS_DirEnt_t* new_dir_entry = allot_space(&header, MFS_BLOCK_SIZE, &entry_offset);
MFS_Inode_t* new_parent_inode = allot_space(&header, sizeof(MFS_Inode_t), &parent_inode_offset);
prepare_inode(new_parent_inode, 0, parent_inode);
update_inode(&header, prot_r->pinum, parent_inode_offset);
i = 0, done = 0;
while(i < 14) {
if(parent_inode->data[i] != -1){
j = 0;
while(j < MFS_BLOCK_SIZE / sizeof(MFS_DirEnt_t)){
//printf("Parent node %d %d\n", inode->data[i], MFS_BLOCK_SIZE / sizeof(MFS_DirEnt_t) );
MFS_DirEnt_t* entry = (MFS_DirEnt_t*)(block_ptr + parent_inode->data[i] + (j * sizeof(MFS_DirEnt_t)));
if(entry->inum != -1 && strcmp(entry->name, prot_r->datapacket) == 0 ){
memcpy(new_dir_entry, block_ptr + parent_inode->data[i] , MFS_BLOCK_SIZE);
//We now know which entry
new_parent_inode->data[i] = entry_offset;
new_dir_entry[j].inum = -1;
update_inode(&header, exist, -1);
prot_r->ret = 0;
new_parent_inode->size--;
done = 1;
break;
}
j++;
}
if(done == 1) break;
}
i++;
}
}
}else{
prot_r->ret = 0;
}
}
} else if(prot_r->cmd == CMD_READ){
prot_r->ret = -1;
MFS_Inode_t* parent_inode = fix_inode(header, prot_r->pinum);
if(parent_inode != NULL && parent_inode->type == MFS_REGULAR_FILE && prot_r->block >= 0 && prot_r->block < 14){
//New inode
memcpy(prot_r->datapacket, block_ptr + parent_inode->data[prot_r->block], MFS_BLOCK_SIZE);
prot_r->ret = 0;
}
} else if(prot_r->cmd == CMD_STAT){
prot_r->ret = -1;
MFS_Inode_t* parent_inode = fix_inode(header, prot_r->pinum);
if(parent_inode != NULL && prot_r->block >= 0 && prot_r->block < 14){
//New inode
prot_r->block = parent_inode->size;
prot_r->datapacket[0] = parent_inode->type;
prot_r->ret = 0;
}
} else if(prot_r->cmd == CMD_WRITE){
verify(&header, &block_ptr, 16384);
prot_r->ret = -1;
MFS_Inode_t* parent_inode = fix_inode(header, prot_r->pinum);
int block_offset;
if(parent_inode != NULL && parent_inode->type == MFS_REGULAR_FILE && prot_r->block >= 0 && prot_r->block < 14){
//New inode
new_inode = (MFS_Inode_t*)allot_space(&header, sizeof(MFS_Inode_t), &inode_offset);
prepare_inode(new_inode, 0, parent_inode);
void* new_block = allot_space(&header, MFS_BLOCK_SIZE, &block_offset);
memcpy(new_block, prot_r->datapacket, MFS_BLOCK_SIZE);
i = prot_r->block;
while(new_inode->data[i] == -1 && i >= 0){
new_inode->size += MFS_BLOCK_SIZE;
new_inode->data[i] = block_offset;
i--;
}
new_inode->data[prot_r->block] = block_offset;
update_inode(&header, prot_r->pinum, inode_offset);
prot_r->ret = 0;
}
} else if(prot_r->cmd == CMD_CREAT){
verify(&header, &block_ptr, 16384);
prot_r->ret = -1;
MFS_Inode_t* parent_inode = fix_inode(header, prot_r->pinum);
int exist = lookup(block_ptr, parent_inode, &(prot_r->datapacket[1]));
if(exist == -1){
new_inode = allot_space(&header, sizeof(MFS_Inode_t), &inode_offset);
prepare_inode(new_inode, prot_r->datapacket[0], NULL);
int new_inode_inum = gen_inum(&header, inode_offset);
if(parent_inode != NULL && parent_inode->type == MFS_DIRECTORY && strlen(&(prot_r->datapacket[1])) <= 28 && new_inode_inum != -1){
//Check if the dir is full
MFS_DirEnt_t* entry;
//Initialize new data block for entries
MFS_DirEnt_t* new_entry = allot_space(&header, MFS_BLOCK_SIZE, &entry_offset);
MFS_Inode_t* new_parent_inode = allot_space(&header, sizeof(MFS_Inode_t), &parent_inode_offset);
prepare_inode(new_parent_inode, 0, parent_inode);
update_inode(&header, prot_r->pinum, parent_inode_offset);
//Copy new stuff
done = 0;
i = 0;
while(i < 14) {
if(parent_inode->data[i] != -1){
j = 0;
while(j < MFS_BLOCK_SIZE / sizeof(MFS_DirEnt_t)){
entry = (MFS_DirEnt_t*)(block_ptr + parent_inode->data[i] + (j * sizeof(MFS_DirEnt_t)));
if(entry->inum == -1){
//Copy the dir entry
memcpy(new_entry, block_ptr + parent_inode->data[i], MFS_BLOCK_SIZE);
new_parent_inode->data[i] = entry_offset;
new_entry[j].inum = new_inode_inum;
strcpy(new_entry[j].name, &(prot_r->datapacket[1]));
//printf("Name: %s - %s\n",entry->name, &(prot_r->datapacket[1]));
done = 1;
break;
}
j++;
}
if(done == 1) break;
}else{
//Create new node
//Initialize
for (j = 0; j < MFS_BLOCK_SIZE / sizeof(MFS_DirEnt_t); j++) {
new_entry[j].inum = -1;
}
new_parent_inode->data[i] = entry_offset;
new_entry[0].inum = new_inode_inum;
strcpy(new_entry[0].name, &(prot_r->datapacket[1]));
done = 1;
break;
}
i++;
}
if(done){
//Actually create the inode
//Add .. and . dirs
if(new_inode->type == MFS_DIRECTORY){
MFS_DirEnt_t* new_dir_entry = allot_space(&header, MFS_BLOCK_SIZE, &new_dir_offset);
for (i = 0; i < MFS_BLOCK_SIZE/sizeof(MFS_DirEnt_t); i++) {
new_dir_entry[i].inum = -1;
}
new_dir_entry[0].name[0] = '.';
new_dir_entry[0].name[1] = '\0';
new_dir_entry[0].inum = new_inode_inum;
new_dir_entry[1].name[0] = '.';
new_dir_entry[1].name[1] = '.';
new_dir_entry[1].name[2] = '\0';
new_dir_entry[1].inum = prot_r->pinum;
new_inode->data[0] = new_dir_offset;
}
//Write to block
new_parent_inode->size++;
header->total_inode++;
prot_r->ret = 0;
}else{
header->total_byte -= unwritten_bytes;
unwritten_bytes = 0;
}
}else{
header->total_byte -= unwritten_bytes;
unwritten_bytes = 0;
}
}else{
prot_r->ret = 0;
}
} else {
fprintf(stderr, "Unknown command");
exit(1);
continue;
}
flush(fd);
write_header(fd, header);
if(UDP_Write(sd, &s, (char*)prot_r, sizeof(MFS_Prot_t)) < -1){
fprintf(stderr, "Unable to send result");
exit(1);
}
}
}
return 0;
}