static struct dentry *squashfs_get_parent(struct dentry *child)
{
struct inode *inode = child->d_inode;
unsigned int parent_ino = squashfs_i(inode)->parent;
return squashfs_export_iget(inode->i_sb, parent_ino);
}
static void squashfs_destroy_inode(struct inode *inode)
{
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,37)
INIT_LIST_HEAD(&inode->i_dentry);
kmem_cache_free(squashfs_inode_cachep, squashfs_i(inode));
#else
call_rcu(&inode->i_rcu, squashfs_i_callback);
#endif
}
static int squashfs_symlink_readpage(struct file *file, struct page *page)
{
struct inode *inode = page->mapping->host;
struct super_block *sb = inode->i_sb;
struct squashfs_sb_info *msblk = sb->s_fs_info;
int index = page->index << PAGE_CACHE_SHIFT;
u64 block = squashfs_i(inode)->start;
int offset = squashfs_i(inode)->offset;
int length = min_t(int, i_size_read(inode) - index, PAGE_CACHE_SIZE);
int bytes, copied;
void *pageaddr;
struct squashfs_cache_entry *entry;
TRACE("Entered squashfs_symlink_readpage, page index %ld, start block "
"%llx, offset %x\n", page->index, block, offset);
if (index) {
bytes = squashfs_read_metadata(sb, NULL, &block, &offset,
index);
if (bytes < 0) {
ERROR("Unable to read symlink [%llx:%x]\n",
squashfs_i(inode)->start,
squashfs_i(inode)->offset);
goto error_out;
}
}
for (bytes = 0; bytes < length; offset = 0, bytes += copied) {
entry = squashfs_cache_get(sb, msblk->block_cache, block, 0);
if (entry->error) {
ERROR("Unable to read symlink [%llx:%x]\n",
squashfs_i(inode)->start,
squashfs_i(inode)->offset);
squashfs_cache_put(entry);
goto error_out;
}
pageaddr = kmap_atomic(page);
copied = squashfs_copy_data(pageaddr + bytes, entry, offset,
length - bytes);
if (copied == length - bytes)
memset(pageaddr + length, 0, PAGE_CACHE_SIZE - length);
else
block = entry->next_index;
kunmap_atomic(pageaddr);
squashfs_cache_put(entry);
}
flush_dcache_page(page);
SetPageUptodate(page);
unlock_page(page);
return 0;
error_out:
SetPageError(page);
unlock_page(page);
return 0;
}
static int squashfs_symlink_readpage(struct file *file, struct page *page)
{
struct inode *inode = page->mapping->host;
struct super_block *sb = inode->i_sb;
struct squashfs_sb_info *msblk = sb->s_fs_info;
int index = page->index << PAGE_CACHE_SHIFT;
u64 block = squashfs_i(inode)->start;
int offset = squashfs_i(inode)->offset;
int length = min_t(int, i_size_read(inode) - index, PAGE_CACHE_SIZE);
int bytes, copied;
void *pageaddr;
struct squashfs_cache_entry *entry;
TRACE("Entered squashfs_symlink_readpage, page index %ld, start block "
"%llx, offset %x\n", page->index, block, offset);
/*
* Skip index bytes into symlink metadata.
*/
if (index) {
bytes = squashfs_read_metadata(sb, NULL, &block, &offset,
index);
if (bytes < 0) {
ERROR("Unable to read symlink [%llx:%x]\n",
squashfs_i(inode)->start,
squashfs_i(inode)->offset);
goto error_out;
}
}
/*
* Read length bytes from symlink metadata. Squashfs_read_metadata
* is not used here because it can sleep and we want to use
* kmap_atomic to map the page. Instead call the underlying
* squashfs_cache_get routine. As length bytes may overlap metadata
* blocks, we may need to call squashfs_cache_get multiple times.
*/
for (bytes = 0; bytes < length; offset = 0, bytes += copied) {
entry = squashfs_cache_get(sb, msblk->block_cache, block, 0);
if (entry->error) {
ERROR("Unable to read symlink [%llx:%x]\n",
squashfs_i(inode)->start,
squashfs_i(inode)->offset);
squashfs_cache_put(entry);
goto error_out;
}
<<<<<<< HEAD
pageaddr = kmap_atomic(page);
=======
<<<<<<< HEAD
void squashfs_put_super(struct super_block *sb)
{
if (sb->s_fs_info) {
struct squashfs_sb_info *sbi = sb->s_fs_info;
squashfs_cache_delete(sbi->block_cache);
squashfs_cache_delete(sbi->fragment_cache);
squashfs_cache_delete(sbi->read_page);
squashfs_decompressor_destroy(sbi);
kfree(sbi->id_table);
kfree(sbi->fragment_index);
kfree(sbi->meta_index);
kfree(sbi->inode_lookup_table);
kfree(sbi->xattr_id_table);
kfree(sb->s_fs_info);
sb->s_fs_info = NULL;
}
if (sb->s_root) {
kfree(squashfs_i(sb->s_root->d_inode));
kfree(sb->s_root);
sb->s_root = NULL;
}
}
static void squashfs_i_callback(struct rcu_head *head)
{
struct inode *inode = container_of(head, struct inode, i_rcu);
INIT_LIST_HEAD(&inode->i_dentry);
kmem_cache_free(squashfs_inode_cachep, squashfs_i(inode));
}
static struct dentry *squashfs_lookup(struct inode *dir, struct dentry *dentry,
unsigned int flags)
{
const unsigned char *name = dentry->d_name.name;
int len = dentry->d_name.len;
struct inode *inode = NULL;
struct squashfs_sb_info *msblk = dir->i_sb->s_fs_info;
struct squashfs_dir_header dirh;
struct squashfs_dir_entry *dire;
u64 block = squashfs_i(dir)->start + msblk->directory_table;
int offset = squashfs_i(dir)->offset;
int err, length;
unsigned int dir_count, size;
TRACE("Entered squashfs_lookup [%llx:%x]\n", block, offset);
dire = kmalloc(sizeof(*dire) + SQUASHFS_NAME_LEN + 1, GFP_KERNEL);
if (dire == NULL) {
ERROR("Failed to allocate squashfs_dir_entry\n");
return ERR_PTR(-ENOMEM);
}
if (len > SQUASHFS_NAME_LEN) {
err = -ENAMETOOLONG;
goto failed;
}
length = get_dir_index_using_name(dir->i_sb, &block, &offset,
squashfs_i(dir)->dir_idx_start,
squashfs_i(dir)->dir_idx_offset,
squashfs_i(dir)->dir_idx_cnt, name, len);
while (length < i_size_read(dir)) {
/*
* Read directory header.
*/
err = squashfs_read_metadata(dir->i_sb, &dirh, &block,
&offset, sizeof(dirh));
if (err < 0)
goto read_failure;
length += sizeof(dirh);
dir_count = le32_to_cpu(dirh.count) + 1;
if (dir_count > SQUASHFS_DIR_COUNT)
goto data_error;
while (dir_count--) {
/*
* Read directory entry.
*/
err = squashfs_read_metadata(dir->i_sb, dire, &block,
&offset, sizeof(*dire));
if (err < 0)
goto read_failure;
size = le16_to_cpu(dire->size) + 1;
/* size should never be larger than SQUASHFS_NAME_LEN */
if (size > SQUASHFS_NAME_LEN)
goto data_error;
err = squashfs_read_metadata(dir->i_sb, dire->name,
&block, &offset, size);
if (err < 0)
goto read_failure;
length += sizeof(*dire) + size;
if (name[0] < dire->name[0])
goto exit_lookup;
if (len == size && !strncmp(name, dire->name, len)) {
unsigned int blk, off, ino_num;
long long ino;
blk = le32_to_cpu(dirh.start_block);
off = le16_to_cpu(dire->offset);
ino_num = le32_to_cpu(dirh.inode_number) +
(short) le16_to_cpu(dire->inode_number);
ino = SQUASHFS_MKINODE(blk, off);
TRACE("calling squashfs_iget for directory "
"entry %s, inode %x:%x, %d\n", name,
blk, off, ino_num);
inode = squashfs_iget(dir->i_sb, ino, ino_num);
goto exit_lookup;
}
}
}
exit_lookup:
kfree(dire);
return d_splice_alias(inode, dentry);
data_error:
err = -EIO;
read_failure:
ERROR("Unable to read directory block [%llx:%x]\n",
squashfs_i(dir)->start + msblk->directory_table,
squashfs_i(dir)->offset);
failed:
kfree(dire);
return ERR_PTR(err);
}
ssize_t squashfs_listxattr(struct dentry *d, char *buffer,
size_t buffer_size)
{
struct inode *inode = d->d_inode;
struct super_block *sb = inode->i_sb;
struct squashfs_sb_info *msblk = sb->s_fs_info;
u64 start = SQUASHFS_XATTR_BLK(squashfs_i(inode)->xattr)
+ msblk->xattr_table;
int offset = SQUASHFS_XATTR_OFFSET(squashfs_i(inode)->xattr);
int count = squashfs_i(inode)->xattr_count;
size_t rest = buffer_size;
int err;
/* check that the file system has xattrs */
if (msblk->xattr_id_table == NULL)
return -EOPNOTSUPP;
/* loop reading each xattr name */
while (count--) {
struct squashfs_xattr_entry entry;
struct squashfs_xattr_val val;
const struct xattr_handler *handler;
int name_size, prefix_size = 0;
err = squashfs_read_metadata(sb, &entry, &start, &offset,
sizeof(entry));
if (err < 0)
goto failed;
name_size = le16_to_cpu(entry.size);
handler = squashfs_xattr_handler(le16_to_cpu(entry.type));
if (handler)
prefix_size = handler->list(d, buffer, rest, NULL,
name_size, handler->flags);
if (prefix_size) {
if (buffer) {
if (prefix_size + name_size + 1 > rest) {
err = -ERANGE;
goto failed;
}
buffer += prefix_size;
}
err = squashfs_read_metadata(sb, buffer, &start,
&offset, name_size);
if (err < 0)
goto failed;
if (buffer) {
buffer[name_size] = '\0';
buffer += name_size + 1;
}
rest -= prefix_size + name_size + 1;
} else {
/* no handler or insuffficient privileges, so skip */
err = squashfs_read_metadata(sb, NULL, &start,
&offset, name_size);
if (err < 0)
goto failed;
}
/* skip remaining xattr entry */
err = squashfs_read_metadata(sb, &val, &start, &offset,
sizeof(val));
if (err < 0)
goto failed;
err = squashfs_read_metadata(sb, NULL, &start, &offset,
le32_to_cpu(val.vsize));
if (err < 0)
goto failed;
}
err = buffer_size - rest;
failed:
return err;
}
static int squashfs_xattr_get(struct inode *inode, int name_index,
const char *name, void *buffer, size_t buffer_size)
{
struct super_block *sb = inode->i_sb;
struct squashfs_sb_info *msblk = sb->s_fs_info;
u64 start = SQUASHFS_XATTR_BLK(squashfs_i(inode)->xattr)
+ msblk->xattr_table;
int offset = SQUASHFS_XATTR_OFFSET(squashfs_i(inode)->xattr);
int count = squashfs_i(inode)->xattr_count;
int name_len = strlen(name);
int err, vsize;
char *target = kmalloc(name_len, GFP_KERNEL);
if (target == NULL)
return -ENOMEM;
/* loop reading each xattr name */
for (; count; count--) {
struct squashfs_xattr_entry entry;
struct squashfs_xattr_val val;
int type, prefix, name_size;
err = squashfs_read_metadata(sb, &entry, &start, &offset,
sizeof(entry));
if (err < 0)
goto failed;
name_size = le16_to_cpu(entry.size);
type = le16_to_cpu(entry.type);
prefix = type & SQUASHFS_XATTR_PREFIX_MASK;
if (prefix == name_index && name_size == name_len)
err = squashfs_read_metadata(sb, target, &start,
&offset, name_size);
else
err = squashfs_read_metadata(sb, NULL, &start,
&offset, name_size);
if (err < 0)
goto failed;
if (prefix == name_index && name_size == name_len &&
strncmp(target, name, name_size) == 0) {
/* found xattr */
if (type & SQUASHFS_XATTR_VALUE_OOL) {
__le64 xattr;
/* val is a reference to the real location */
err = squashfs_read_metadata(sb, &val, &start,
&offset, sizeof(val));
if (err < 0)
goto failed;
err = squashfs_read_metadata(sb, &xattr, &start,
&offset, sizeof(xattr));
if (err < 0)
goto failed;
xattr = le64_to_cpu(xattr);
start = SQUASHFS_XATTR_BLK(xattr) +
msblk->xattr_table;
offset = SQUASHFS_XATTR_OFFSET(xattr);
}
/* read xattr value */
err = squashfs_read_metadata(sb, &val, &start, &offset,
sizeof(val));
if (err < 0)
goto failed;
vsize = le32_to_cpu(val.vsize);
if (buffer) {
if (vsize > buffer_size) {
err = -ERANGE;
goto failed;
}
err = squashfs_read_metadata(sb, buffer, &start,
&offset, vsize);
if (err < 0)
goto failed;
}
break;
}
/* no match, skip remaining xattr entry */
err = squashfs_read_metadata(sb, &val, &start, &offset,
sizeof(val));
if (err < 0)
goto failed;
err = squashfs_read_metadata(sb, NULL, &start, &offset,
le32_to_cpu(val.vsize));
if (err < 0)
goto failed;
}
err = count ? vsize : -ENODATA;
failed:
kfree(target);
return err;
}
static void squashfs_i_callback(struct rcu_head *head)
{
struct inode *inode = container_of(head, struct inode, i_rcu);
kmem_cache_free(squashfs_inode_cachep, squashfs_i(inode));
}
int squashfs_lookup_next(struct inode *dir, char *root_name,
char *cur_name)
{
const unsigned char *name = root_name;
int len = strlen(root_name);
struct squashfs_sb_info *msblk = dir->i_sb->s_fs_info;
struct squashfs_dir_header dirh;
struct squashfs_dir_entry *dire;
u64 block = squashfs_i(dir)->start + msblk->directory_table;
int offset = squashfs_i(dir)->offset;
int err, length;
unsigned int dir_count, size;
int name_found = 0, real_name_found = 0;
TRACE("Entered squashfs_lookup_next [%llx:%x]\n", block, offset);
dire = kmalloc(sizeof(*dire) + SQUASHFS_NAME_LEN + 1, GFP_KERNEL);
if (dire == NULL) {
ERROR("Failed to allocate squashfs_dir_entry\n");
return -ENOMEM;
}
if (len > SQUASHFS_NAME_LEN) {
err = -ENAMETOOLONG;
goto failed;
}
length = get_dir_index_using_name(dir->i_sb, &block, &offset,
squashfs_i(dir)->dir_idx_start,
squashfs_i(dir)->dir_idx_offset,
squashfs_i(dir)->dir_idx_cnt, name, len);
while (length < i_size_read(dir)) {
/*
* Read directory header.
*/
err = squashfs_read_metadata(dir->i_sb, &dirh, &block,
&offset, sizeof(dirh));
if (err < 0)
goto read_failure;
length += sizeof(dirh);
dir_count = le32_to_cpu(dirh.count) + 1;
if (dir_count > SQUASHFS_DIR_COUNT)
goto data_error;
while (dir_count--) {
/*
* Read directory entry.
*/
err = squashfs_read_metadata(dir->i_sb, dire, &block,
&offset, sizeof(*dire));
if (err < 0)
goto read_failure;
size = le16_to_cpu(dire->size) + 1;
/* size should never be larger than SQUASHFS_NAME_LEN */
if (size > SQUASHFS_NAME_LEN)
goto data_error;
err = squashfs_read_metadata(dir->i_sb, dire->name,
&block, &offset, size);
if (err < 0)
goto read_failure;
length += sizeof(*dire) + size;
dire->name[size] = '\0';
if (cur_name[0] == '/')
name_found = 1;
if (!strcmp(cur_name, name))
name_found = 1;
if (cur_name[0] != '/'
&& strlen(cur_name) == size
&& !strncmp(cur_name, dire->name, size)) {
name_found = 1;
continue;
}
if (name_found) {
sprintf(cur_name, "%s", dire->name);
real_name_found = 1;
goto exit_lookup;
}
}
}
exit_lookup:
kfree(dire);
return real_name_found ? 0 : 1;
data_error:
err = -EIO;
read_failure:
ERROR("Unable to read directory block [%llx:%x]\n",
squashfs_i(dir)->start + msblk->directory_table,
squashfs_i(dir)->offset);
failed:
kfree(dire);
return 1;
}
/*
* Initialise VFS inode by reading inode from inode table (compressed
* metadata). The format and amount of data read depends on type.
*/
int squashfs_read_inode(struct inode *inode, long long ino)
{
struct super_block *sb = inode->i_sb;
struct squashfs_sb_info *msblk = sb->s_fs_info;
u64 block = SQUASHFS_INODE_BLK(ino) + msblk->inode_table;
int err, type, offset = SQUASHFS_INODE_OFFSET(ino);
union squashfs_inode squashfs_ino;
struct squashfs_base_inode *sqshb_ino = &squashfs_ino.base;
int xattr_id = SQUASHFS_INVALID_XATTR;
TRACE("Entered squashfs_read_inode\n");
/*
* Read inode base common to all inode types.
*/
err = squashfs_read_metadata(sb, sqshb_ino, &block,
&offset, sizeof(*sqshb_ino));
if (err < 0)
goto failed_read;
err = squashfs_new_inode(sb, inode, sqshb_ino);
if (err)
goto failed_read;
block = SQUASHFS_INODE_BLK(ino) + msblk->inode_table;
offset = SQUASHFS_INODE_OFFSET(ino);
type = le16_to_cpu(sqshb_ino->inode_type);
switch (type) {
case SQUASHFS_REG_TYPE: {
unsigned int frag_offset, frag;
int frag_size;
u64 frag_blk;
struct squashfs_reg_inode *sqsh_ino = &squashfs_ino.reg;
err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset,
sizeof(*sqsh_ino));
if (err < 0)
goto failed_read;
frag = le32_to_cpu(sqsh_ino->fragment);
if (frag != SQUASHFS_INVALID_FRAG) {
frag_offset = le32_to_cpu(sqsh_ino->offset);
frag_size = squashfs_frag_lookup(sb, frag, &frag_blk);
if (frag_size < 0) {
err = frag_size;
goto failed_read;
}
} else {
frag_blk = SQUASHFS_INVALID_BLK;
frag_size = 0;
frag_offset = 0;
}
set_nlink(inode, 1);
inode->i_size = le32_to_cpu(sqsh_ino->file_size);
inode->i_fop = &generic_ro_fops;
inode->i_mode |= S_IFREG;
inode->i_blocks = ((inode->i_size - 1) >> 9) + 1;
squashfs_i(inode)->fragment_block = frag_blk;
squashfs_i(inode)->fragment_size = frag_size;
squashfs_i(inode)->fragment_offset = frag_offset;
squashfs_i(inode)->start = le32_to_cpu(sqsh_ino->start_block);
squashfs_i(inode)->block_list_start = block;
squashfs_i(inode)->offset = offset;
inode->i_data.a_ops = &squashfs_aops;
TRACE("File inode %x:%x, start_block %llx, block_list_start "
"%llx, offset %x\n", SQUASHFS_INODE_BLK(ino),
offset, squashfs_i(inode)->start, block, offset);
break;
}
case SQUASHFS_LREG_TYPE: {
unsigned int frag_offset, frag;
int frag_size;
u64 frag_blk;
struct squashfs_lreg_inode *sqsh_ino = &squashfs_ino.lreg;
err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset,
sizeof(*sqsh_ino));
if (err < 0)
goto failed_read;
frag = le32_to_cpu(sqsh_ino->fragment);
if (frag != SQUASHFS_INVALID_FRAG) {
frag_offset = le32_to_cpu(sqsh_ino->offset);
frag_size = squashfs_frag_lookup(sb, frag, &frag_blk);
if (frag_size < 0) {
err = frag_size;
goto failed_read;
}
} else {
frag_blk = SQUASHFS_INVALID_BLK;
frag_size = 0;
frag_offset = 0;
}
xattr_id = le32_to_cpu(sqsh_ino->xattr);
set_nlink(inode, le32_to_cpu(sqsh_ino->nlink));
inode->i_size = le64_to_cpu(sqsh_ino->file_size);
inode->i_op = &squashfs_inode_ops;
inode->i_fop = &generic_ro_fops;
inode->i_mode |= S_IFREG;
inode->i_blocks = (inode->i_size -
le64_to_cpu(sqsh_ino->sparse) + 511) >> 9;
squashfs_i(inode)->fragment_block = frag_blk;
squashfs_i(inode)->fragment_size = frag_size;
squashfs_i(inode)->fragment_offset = frag_offset;
squashfs_i(inode)->start = le64_to_cpu(sqsh_ino->start_block);
squashfs_i(inode)->block_list_start = block;
squashfs_i(inode)->offset = offset;
inode->i_data.a_ops = &squashfs_aops;
TRACE("File inode %x:%x, start_block %llx, block_list_start "
"%llx, offset %x\n", SQUASHFS_INODE_BLK(ino),
offset, squashfs_i(inode)->start, block, offset);
break;
}
case SQUASHFS_DIR_TYPE: {
struct squashfs_dir_inode *sqsh_ino = &squashfs_ino.dir;
err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset,
sizeof(*sqsh_ino));
if (err < 0)
goto failed_read;
set_nlink(inode, le32_to_cpu(sqsh_ino->nlink));
inode->i_size = le16_to_cpu(sqsh_ino->file_size);
inode->i_op = &squashfs_dir_inode_ops;
inode->i_fop = &squashfs_dir_ops;
inode->i_mode |= S_IFDIR;
squashfs_i(inode)->start = le32_to_cpu(sqsh_ino->start_block);
squashfs_i(inode)->offset = le16_to_cpu(sqsh_ino->offset);
squashfs_i(inode)->dir_idx_cnt = 0;
squashfs_i(inode)->parent = le32_to_cpu(sqsh_ino->parent_inode);
TRACE("Directory inode %x:%x, start_block %llx, offset %x\n",
SQUASHFS_INODE_BLK(ino), offset,
squashfs_i(inode)->start,
le16_to_cpu(sqsh_ino->offset));
break;
}
case SQUASHFS_LDIR_TYPE: {
struct squashfs_ldir_inode *sqsh_ino = &squashfs_ino.ldir;
err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset,
sizeof(*sqsh_ino));
if (err < 0)
goto failed_read;
xattr_id = le32_to_cpu(sqsh_ino->xattr);
set_nlink(inode, le32_to_cpu(sqsh_ino->nlink));
inode->i_size = le32_to_cpu(sqsh_ino->file_size);
inode->i_op = &squashfs_dir_inode_ops;
inode->i_fop = &squashfs_dir_ops;
inode->i_mode |= S_IFDIR;
squashfs_i(inode)->start = le32_to_cpu(sqsh_ino->start_block);
squashfs_i(inode)->offset = le16_to_cpu(sqsh_ino->offset);
squashfs_i(inode)->dir_idx_start = block;
squashfs_i(inode)->dir_idx_offset = offset;
squashfs_i(inode)->dir_idx_cnt = le16_to_cpu(sqsh_ino->i_count);
squashfs_i(inode)->parent = le32_to_cpu(sqsh_ino->parent_inode);
TRACE("Long directory inode %x:%x, start_block %llx, offset "
"%x\n", SQUASHFS_INODE_BLK(ino), offset,
squashfs_i(inode)->start,
le16_to_cpu(sqsh_ino->offset));
break;
}
case SQUASHFS_SYMLINK_TYPE:
case SQUASHFS_LSYMLINK_TYPE: {
struct squashfs_symlink_inode *sqsh_ino = &squashfs_ino.symlink;
err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset,
sizeof(*sqsh_ino));
if (err < 0)
goto failed_read;
set_nlink(inode, le32_to_cpu(sqsh_ino->nlink));
inode->i_size = le32_to_cpu(sqsh_ino->symlink_size);
inode->i_op = &squashfs_symlink_inode_ops;
inode->i_data.a_ops = &squashfs_symlink_aops;
inode->i_mode |= S_IFLNK;
squashfs_i(inode)->start = block;
squashfs_i(inode)->offset = offset;
if (type == SQUASHFS_LSYMLINK_TYPE) {
__le32 xattr;
err = squashfs_read_metadata(sb, NULL, &block,
&offset, inode->i_size);
if (err < 0)
goto failed_read;
err = squashfs_read_metadata(sb, &xattr, &block,
&offset, sizeof(xattr));
if (err < 0)
goto failed_read;
xattr_id = le32_to_cpu(xattr);
}
TRACE("Symbolic link inode %x:%x, start_block %llx, offset "
"%x\n", SQUASHFS_INODE_BLK(ino), offset,
block, offset);
break;
}
case SQUASHFS_BLKDEV_TYPE:
case SQUASHFS_CHRDEV_TYPE: {
struct squashfs_dev_inode *sqsh_ino = &squashfs_ino.dev;
unsigned int rdev;
err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset,
sizeof(*sqsh_ino));
if (err < 0)
goto failed_read;
if (type == SQUASHFS_CHRDEV_TYPE)
inode->i_mode |= S_IFCHR;
else
inode->i_mode |= S_IFBLK;
set_nlink(inode, le32_to_cpu(sqsh_ino->nlink));
rdev = le32_to_cpu(sqsh_ino->rdev);
init_special_inode(inode, inode->i_mode, new_decode_dev(rdev));
TRACE("Device inode %x:%x, rdev %x\n",
SQUASHFS_INODE_BLK(ino), offset, rdev);
break;
}
case SQUASHFS_LBLKDEV_TYPE:
case SQUASHFS_LCHRDEV_TYPE: {
struct squashfs_ldev_inode *sqsh_ino = &squashfs_ino.ldev;
unsigned int rdev;
err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset,
sizeof(*sqsh_ino));
if (err < 0)
goto failed_read;
if (type == SQUASHFS_LCHRDEV_TYPE)
inode->i_mode |= S_IFCHR;
else
inode->i_mode |= S_IFBLK;
xattr_id = le32_to_cpu(sqsh_ino->xattr);
inode->i_op = &squashfs_inode_ops;
set_nlink(inode, le32_to_cpu(sqsh_ino->nlink));
rdev = le32_to_cpu(sqsh_ino->rdev);
init_special_inode(inode, inode->i_mode, new_decode_dev(rdev));
TRACE("Device inode %x:%x, rdev %x\n",
SQUASHFS_INODE_BLK(ino), offset, rdev);
break;
}
case SQUASHFS_FIFO_TYPE:
case SQUASHFS_SOCKET_TYPE: {
struct squashfs_ipc_inode *sqsh_ino = &squashfs_ino.ipc;
err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset,
sizeof(*sqsh_ino));
if (err < 0)
goto failed_read;
if (type == SQUASHFS_FIFO_TYPE)
inode->i_mode |= S_IFIFO;
else
inode->i_mode |= S_IFSOCK;
set_nlink(inode, le32_to_cpu(sqsh_ino->nlink));
init_special_inode(inode, inode->i_mode, 0);
break;
}
case SQUASHFS_LFIFO_TYPE:
case SQUASHFS_LSOCKET_TYPE: {
struct squashfs_lipc_inode *sqsh_ino = &squashfs_ino.lipc;
err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset,
sizeof(*sqsh_ino));
if (err < 0)
goto failed_read;
if (type == SQUASHFS_LFIFO_TYPE)
inode->i_mode |= S_IFIFO;
else
inode->i_mode |= S_IFSOCK;
xattr_id = le32_to_cpu(sqsh_ino->xattr);
inode->i_op = &squashfs_inode_ops;
set_nlink(inode, le32_to_cpu(sqsh_ino->nlink));
init_special_inode(inode, inode->i_mode, 0);
break;
}
default:
ERROR("Unknown inode type %d in squashfs_iget!\n", type);
return -EINVAL;
}
if (xattr_id != SQUASHFS_INVALID_XATTR && msblk->xattr_id_table) {
err = squashfs_xattr_lookup(sb, xattr_id,
&squashfs_i(inode)->xattr_count,
&squashfs_i(inode)->xattr_size,
&squashfs_i(inode)->xattr);
if (err < 0)
goto failed_read;
inode->i_blocks += ((squashfs_i(inode)->xattr_size - 1) >> 9)
+ 1;
} else
static int squashfs_readdir(struct file *file, void *dirent, filldir_t filldir)
{
struct inode *inode = file->f_dentry->d_inode;
struct squashfs_sb_info *msblk = inode->i_sb->s_fs_info;
u64 block = squashfs_i(inode)->start + msblk->directory_table;
int offset = squashfs_i(inode)->offset, length, dir_count, size,
type, err;
unsigned int inode_number;
struct squashfs_dir_header dirh;
struct squashfs_dir_entry *dire;
TRACE("Entered squashfs_readdir [%llx:%x]\n", block, offset);
dire = kmalloc(sizeof(*dire) + SQUASHFS_NAME_LEN + 1, GFP_KERNEL);
if (dire == NULL) {
ERROR("Failed to allocate squashfs_dir_entry\n");
goto finish;
}
while (file->f_pos < 3) {
char *name;
int i_ino;
if (file->f_pos == 0) {
name = ".";
size = 1;
i_ino = inode->i_ino;
} else {
name = "..";
size = 2;
i_ino = squashfs_i(inode)->parent;
}
TRACE("Calling filldir(%p, %s, %d, %lld, %d, %d)\n",
dirent, name, size, file->f_pos, i_ino,
squashfs_filetype_table[1]);
if (filldir(dirent, name, size, file->f_pos, i_ino,
squashfs_filetype_table[1]) < 0) {
TRACE("Filldir returned less than 0\n");
goto finish;
}
file->f_pos += size;
}
length = get_dir_index_using_offset(inode->i_sb, &block, &offset,
squashfs_i(inode)->dir_idx_start,
squashfs_i(inode)->dir_idx_offset,
squashfs_i(inode)->dir_idx_cnt,
file->f_pos);
while (length < i_size_read(inode)) {
err = squashfs_read_metadata(inode->i_sb, &dirh, &block,
&offset, sizeof(dirh));
if (err < 0)
goto failed_read;
length += sizeof(dirh);
dir_count = le32_to_cpu(dirh.count) + 1;
if (dir_count > SQUASHFS_DIR_COUNT)
goto failed_read;
while (dir_count--) {
err = squashfs_read_metadata(inode->i_sb, dire, &block,
&offset, sizeof(*dire));
if (err < 0)
goto failed_read;
size = le16_to_cpu(dire->size) + 1;
if (size > SQUASHFS_NAME_LEN)
goto failed_read;
err = squashfs_read_metadata(inode->i_sb, dire->name,
&block, &offset, size);
if (err < 0)
goto failed_read;
length += sizeof(*dire) + size;
if (file->f_pos >= length)
continue;
dire->name[size] = '\0';
inode_number = le32_to_cpu(dirh.inode_number) +
((short) le16_to_cpu(dire->inode_number));
type = le16_to_cpu(dire->type);
TRACE("Calling filldir(%p, %s, %d, %lld, %x:%x, %d, %d)"
"\n", dirent, dire->name, size,
file->f_pos,
le32_to_cpu(dirh.start_block),
le16_to_cpu(dire->offset),
inode_number,
squashfs_filetype_table[type]);
if (filldir(dirent, dire->name, size, file->f_pos,
inode_number,
squashfs_filetype_table[type]) < 0) {
TRACE("Filldir returned less than 0\n");
goto finish;
}
file->f_pos = length;
}
}
finish:
kfree(dire);
return 0;
failed_read:
ERROR("Unable to read directory block [%llx:%x]\n", block, offset);
kfree(dire);
return 0;
}
static void squashfs_destroy_inode(struct inode *inode)
{
kmem_cache_free(squashfs_inode_cachep, squashfs_i(inode));
}
static int squashfs_readdir(struct file *file, struct dir_context *ctx)
{
struct inode *inode = file_inode(file);
struct squashfs_sb_info *msblk = inode->i_sb->s_fs_info;
u64 block = squashfs_i(inode)->start + msblk->directory_table;
int offset = squashfs_i(inode)->offset, length, err;
unsigned int inode_number, dir_count, size, type;
struct squashfs_dir_header dirh;
struct squashfs_dir_entry *dire;
TRACE("Entered squashfs_readdir [%llx:%x]\n", block, offset);
dire = kmalloc(sizeof(*dire) + SQUASHFS_NAME_LEN + 1, GFP_KERNEL);
if (dire == NULL) {
ERROR("Failed to allocate squashfs_dir_entry\n");
goto finish;
}
/*
* Return "." and ".." entries as the first two filenames in the
* directory. To maximise compression these two entries are not
* stored in the directory, and so we invent them here.
*
* It also means that the external f_pos is offset by 3 from the
* on-disk directory f_pos.
*/
while (ctx->pos < 3) {
char *name;
int i_ino;
if (ctx->pos == 0) {
name = ".";
size = 1;
i_ino = inode->i_ino;
} else {
name = "..";
size = 2;
i_ino = squashfs_i(inode)->parent;
}
if (!dir_emit(ctx, name, size, i_ino,
squashfs_filetype_table[1]))
goto finish;
ctx->pos += size;
}
length = get_dir_index_using_offset(inode->i_sb, &block, &offset,
squashfs_i(inode)->dir_idx_start,
squashfs_i(inode)->dir_idx_offset,
squashfs_i(inode)->dir_idx_cnt,
ctx->pos);
while (length < i_size_read(inode)) {
/*
* Read directory header
*/
err = squashfs_read_metadata(inode->i_sb, &dirh, &block,
&offset, sizeof(dirh));
if (err < 0)
goto failed_read;
length += sizeof(dirh);
dir_count = le32_to_cpu(dirh.count) + 1;
if (dir_count > SQUASHFS_DIR_COUNT)
goto failed_read;
while (dir_count--) {
/*
* Read directory entry.
*/
err = squashfs_read_metadata(inode->i_sb, dire, &block,
&offset, sizeof(*dire));
if (err < 0)
goto failed_read;
size = le16_to_cpu(dire->size) + 1;
/* size should never be larger than SQUASHFS_NAME_LEN */
if (size > SQUASHFS_NAME_LEN)
goto failed_read;
err = squashfs_read_metadata(inode->i_sb, dire->name,
&block, &offset, size);
if (err < 0)
goto failed_read;
length += sizeof(*dire) + size;
if (ctx->pos >= length)
continue;
dire->name[size] = '\0';
inode_number = le32_to_cpu(dirh.inode_number) +
((short) le16_to_cpu(dire->inode_number));
type = le16_to_cpu(dire->type);
if (type > SQUASHFS_MAX_DIR_TYPE)
goto failed_read;
if (!dir_emit(ctx, dire->name, size,
inode_number,
squashfs_filetype_table[type]))
goto finish;
ctx->pos = length;
}
}
finish:
kfree(dire);
return 0;
failed_read:
ERROR("Unable to read directory block [%llx:%x]\n", block, offset);
kfree(dire);
return 0;
}
