Signed-off-by: Phillip Lougher phil...@lougher.demon.co.uk
---
fs/squashfs/inode.c | 346 +++
1 files changed, 346 insertions(+), 0 deletions(-)
diff --git a/fs/squashfs/inode.c b/fs/squashfs/inode.c
new file mode 100644
index 000..7a63398
--- /dev/null
+++ b/fs/squashfs/inode.c
@@ -0,0 +1,346 @@
+/*
+ * Squashfs - a compressed read only filesystem for Linux
+ *
+ * Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008
+ * Phillip Lougher phil...@lougher.demon.co.uk
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2,
+ * or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * inode.c
+ */
+
+/*
+ * This file implements code to create and read inodes from disk.
+ *
+ * Inodes in Squashfs are identified by a 48-bit inode which encodes the
+ * location of the compressed metadata block containing the inode, and the byte
+ * offset into that block where the inode is placed (block, offset).
+ *
+ * To maximise compression there are different inodes for each file type
+ * (regular file, directory, device, etc.), the inode contents and length
+ * varying with the type.
+ *
+ * To further maximise compression, two types of regular file inode and
+ * directory inode are defined: inodes optimised for frequently occurring
+ * regular files and directories, and extended types where extra
+ * information has to be stored.
+ */
+
+#include linux/fs.h
+#include linux/vfs.h
+#include linux/zlib.h
+
+#include squashfs_fs.h
+#include squashfs_fs_sb.h
+#include squashfs_fs_i.h
+#include squashfs.h
+
+/*
+ * Initialise VFS inode with the base inode information common to all
+ * Squashfs inode types. Sqsh_ino contains the unswapped base inode
+ * off disk.
+ */
+static int squashfs_new_inode(struct super_block *sb, struct inode *inode,
+ struct squashfs_base_inode *sqsh_ino)
+{
+ int err;
+
+ err = squashfs_get_id(sb, le16_to_cpu(sqsh_ino-uid), inode-i_uid);
+ if (err)
+ return err;
+
+ err = squashfs_get_id(sb, le16_to_cpu(sqsh_ino-guid), inode-i_gid);
+ if (err)
+ return err;
+
+ inode-i_ino = le32_to_cpu(sqsh_ino-inode_number);
+ inode-i_mtime.tv_sec = le32_to_cpu(sqsh_ino-mtime);
+ inode-i_atime.tv_sec = inode-i_mtime.tv_sec;
+ inode-i_ctime.tv_sec = inode-i_mtime.tv_sec;
+ inode-i_mode = le16_to_cpu(sqsh_ino-mode);
+ inode-i_size = 0;
+
+ return err;
+}
+
+
+struct inode *squashfs_iget(struct super_block *sb, long long ino,
+ unsigned int ino_number)
+{
+ struct inode *inode = iget_locked(sb, ino_number);
+ int err;
+
+ TRACE(Entered squashfs_iget\n);
+
+ if (!inode)
+ return ERR_PTR(-ENOMEM);
+ if (!(inode-i_state I_NEW))
+ return inode;
+
+ err = squashfs_read_inode(inode, ino);
+ if (err) {
+ iget_failed(inode);
+ return ERR_PTR(err);
+ }
+
+ unlock_new_inode(inode);
+ return inode;
+}
+
+
+/*
+ * 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;
+
+ 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_size, frag;
+ u64 frag_blk;
+ struct squashfs_reg_inode *sqsh_ino =
