/*
* 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_read_inode_2(struct inode *i, squashfs_inode_t inode)
{
struct super_block *s = i->i_sb;
struct squashfs_sb_info *msblk = s->s_fs_info;
struct squashfs_super_block *sblk = &msblk->sblk;
unsigned int block = SQUASHFS_INODE_BLK(inode) +
sblk->inode_table_start;
unsigned int offset = SQUASHFS_INODE_OFFSET(inode);
unsigned int ino = i->i_ino;
long long next_block;
unsigned int next_offset;
union squashfs_inode_header_2 id, sid;
struct squashfs_base_inode_header_2 *inodeb = &id.base,
*sinodeb = &sid.base;
TRACE("Entered squashfs_iget\n");
if (msblk->swap) {
if (!squashfs_get_cached_block(s, (char *) sinodeb, block,
offset, sizeof(*sinodeb), &next_block,
&next_offset))
goto failed_read;
SQUASHFS_SWAP_BASE_INODE_HEADER_2(inodeb, sinodeb,
sizeof(*sinodeb));
} else if (!squashfs_get_cached_block(s, (char *) inodeb, block,
offset, sizeof(*inodeb), &next_block,
&next_offset))
goto failed_read;
squashfs_new_inode(msblk, i, inodeb, ino);
switch(inodeb->inode_type) {
case SQUASHFS_FILE_TYPE: {
struct squashfs_reg_inode_header_2 *inodep = &id.reg;
struct squashfs_reg_inode_header_2 *sinodep = &sid.reg;
long long frag_blk;
unsigned int frag_size = 0;
if (msblk->swap) {
if (!squashfs_get_cached_block(s, (char *)
sinodep, block, offset,
sizeof(*sinodep), &next_block,
&next_offset))
goto failed_read;
SQUASHFS_SWAP_REG_INODE_HEADER_2(inodep, sinodep);
} else if (!squashfs_get_cached_block(s, (char *)
inodep, block, offset,
sizeof(*inodep), &next_block,
&next_offset))
goto failed_read;
frag_blk = SQUASHFS_INVALID_BLK;
if (inodep->fragment != SQUASHFS_INVALID_FRAG &&
!get_fragment_location_2(s,
inodep->fragment, &frag_blk, &frag_size))
goto failed_read;
i->i_size = inodep->file_size;
i->i_fop = &generic_ro_fops;
i->i_mode |= S_IFREG;
i->i_mtime.tv_sec = inodep->mtime;
i->i_atime.tv_sec = inodep->mtime;
i->i_ctime.tv_sec = inodep->mtime;
i->i_blocks = ((i->i_size - 1) >> 9) + 1;
SQUASHFS_I(i)->u.s1.fragment_start_block = frag_blk;
SQUASHFS_I(i)->u.s1.fragment_size = frag_size;
SQUASHFS_I(i)->u.s1.fragment_offset = inodep->offset;
SQUASHFS_I(i)->start_block = inodep->start_block;
SQUASHFS_I(i)->u.s1.block_list_start = next_block;
SQUASHFS_I(i)->offset = next_offset;
if (sblk->block_size > 4096)
i->i_data.a_ops = &squashfs_aops;
else
i->i_data.a_ops = &squashfs_aops_4K;
TRACE("File inode %x:%x, start_block %x, "
"block_list_start %llx, offset %x\n",
SQUASHFS_INODE_BLK(inode), offset,
inodep->start_block, next_block,
next_offset);
break;
}
case SQUASHFS_DIR_TYPE: {
struct squashfs_dir_inode_header_2 *inodep = &id.dir;
struct squashfs_dir_inode_header_2 *sinodep = &sid.dir;
if (msblk->swap) {
if (!squashfs_get_cached_block(s, (char *)
sinodep, block, offset,
sizeof(*sinodep), &next_block,
&next_offset))
goto failed_read;
SQUASHFS_SWAP_DIR_INODE_HEADER_2(inodep, sinodep);
} else if (!squashfs_get_cached_block(s, (char *)
inodep, block, offset,
sizeof(*inodep), &next_block,
&next_offset))
goto failed_read;
i->i_size = inodep->file_size;
i->i_op = &squashfs_dir_inode_ops_2;
i->i_fop = &squashfs_dir_ops_2;
i->i_mode |= S_IFDIR;
i->i_mtime.tv_sec = inodep->mtime;
i->i_atime.tv_sec = inodep->mtime;
i->i_ctime.tv_sec = inodep->mtime;
SQUASHFS_I(i)->start_block = inodep->start_block;
SQUASHFS_I(i)->offset = inodep->offset;
SQUASHFS_I(i)->u.s2.directory_index_count = 0;
SQUASHFS_I(i)->u.s2.parent_inode = 0;
TRACE("Directory inode %x:%x, start_block %x, offset "
"%x\n", SQUASHFS_INODE_BLK(inode),
offset, inodep->start_block,
inodep->offset);
break;
}
case SQUASHFS_LDIR_TYPE: {
struct squashfs_ldir_inode_header_2 *inodep = &id.ldir;
struct squashfs_ldir_inode_header_2 *sinodep = &sid.ldir;
if (msblk->swap) {
if (!squashfs_get_cached_block(s, (char *)
sinodep, block, offset,
sizeof(*sinodep), &next_block,
&next_offset))
goto failed_read;
SQUASHFS_SWAP_LDIR_INODE_HEADER_2(inodep,
sinodep);
} else if (!squashfs_get_cached_block(s, (char *)
inodep, block, offset,
sizeof(*inodep), &next_block,
&next_offset))
goto failed_read;
i->i_size = inodep->file_size;
i->i_op = &squashfs_dir_inode_ops_2;
i->i_fop = &squashfs_dir_ops_2;
i->i_mode |= S_IFDIR;
i->i_mtime.tv_sec = inodep->mtime;
i->i_atime.tv_sec = inodep->mtime;
i->i_ctime.tv_sec = inodep->mtime;
SQUASHFS_I(i)->start_block = inodep->start_block;
SQUASHFS_I(i)->offset = inodep->offset;
SQUASHFS_I(i)->u.s2.directory_index_start = next_block;
SQUASHFS_I(i)->u.s2.directory_index_offset =
next_offset;
SQUASHFS_I(i)->u.s2.directory_index_count =
inodep->i_count;
SQUASHFS_I(i)->u.s2.parent_inode = 0;
TRACE("Long directory inode %x:%x, start_block %x, "
"offset %x\n",
SQUASHFS_INODE_BLK(inode), offset,
inodep->start_block, inodep->offset);
break;
}
case SQUASHFS_SYMLINK_TYPE: {
struct squashfs_symlink_inode_header_2 *inodep =
&id.symlink;
struct squashfs_symlink_inode_header_2 *sinodep =
&sid.symlink;
if (msblk->swap) {
if (!squashfs_get_cached_block(s, (char *)
sinodep, block, offset,
sizeof(*sinodep), &next_block,
&next_offset))
goto failed_read;
SQUASHFS_SWAP_SYMLINK_INODE_HEADER_2(inodep,
sinodep);
} else if (!squashfs_get_cached_block(s, (char *)
inodep, block, offset,
sizeof(*inodep), &next_block,
&next_offset))
goto failed_read;
i->i_size = inodep->symlink_size;
i->i_op = &page_symlink_inode_operations;
i->i_data.a_ops = &squashfs_symlink_aops;
i->i_mode |= S_IFLNK;
SQUASHFS_I(i)->start_block = next_block;
SQUASHFS_I(i)->offset = next_offset;
TRACE("Symbolic link inode %x:%x, start_block %llx, "
"offset %x\n",
SQUASHFS_INODE_BLK(inode), offset,
next_block, next_offset);
break;
}
case SQUASHFS_BLKDEV_TYPE:
case SQUASHFS_CHRDEV_TYPE: {
struct squashfs_dev_inode_header_2 *inodep = &id.dev;
struct squashfs_dev_inode_header_2 *sinodep = &sid.dev;
if (msblk->swap) {
if (!squashfs_get_cached_block(s, (char *)
sinodep, block, offset,
sizeof(*sinodep), &next_block,
&next_offset))
goto failed_read;
SQUASHFS_SWAP_DEV_INODE_HEADER_2(inodep, sinodep);
} else if (!squashfs_get_cached_block(s, (char *)
inodep, block, offset,
sizeof(*inodep), &next_block,
&next_offset))
goto failed_read;
i->i_mode |= (inodeb->inode_type ==
SQUASHFS_CHRDEV_TYPE) ? S_IFCHR :
S_IFBLK;
init_special_inode(i, i->i_mode,
old_decode_dev(inodep->rdev));
TRACE("Device inode %x:%x, rdev %x\n",
SQUASHFS_INODE_BLK(inode), offset,
inodep->rdev);
break;
}
case SQUASHFS_FIFO_TYPE:
case SQUASHFS_SOCKET_TYPE: {
i->i_mode |= (inodeb->inode_type == SQUASHFS_FIFO_TYPE)
? S_IFIFO : S_IFSOCK;
init_special_inode(i, i->i_mode, 0);
break;
}
default:
ERROR("Unknown inode type %d in squashfs_iget!\n",
inodeb->inode_type);
goto failed_read1;
}
return 1;
failed_read:
ERROR("Unable to read inode [%x:%x]\n", block, offset);
failed_read1:
return 0;
}