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417 lines
12 KiB
417 lines
12 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Squashfs - a compressed read only filesystem for Linux |
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* |
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* Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008 |
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* Phillip Lougher <[email protected]> |
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* |
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* inode.c |
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*/ |
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|
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/* |
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* This file implements code to create and read inodes from disk. |
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* |
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* Inodes in Squashfs are identified by a 48-bit inode which encodes the |
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* location of the compressed metadata block containing the inode, and the byte |
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* offset into that block where the inode is placed (<block, offset>). |
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* |
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* To maximise compression there are different inodes for each file type |
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* (regular file, directory, device, etc.), the inode contents and length |
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* varying with the type. |
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* |
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* To further maximise compression, two types of regular file inode and |
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* directory inode are defined: inodes optimised for frequently occurring |
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* regular files and directories, and extended types where extra |
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* information has to be stored. |
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*/ |
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#include <linux/fs.h> |
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#include <linux/vfs.h> |
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#include <linux/xattr.h> |
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#include <linux/pagemap.h> |
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#include "squashfs_fs.h" |
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#include "squashfs_fs_sb.h" |
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#include "squashfs_fs_i.h" |
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#include "squashfs.h" |
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#include "xattr.h" |
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|
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/* |
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* Initialise VFS inode with the base inode information common to all |
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* Squashfs inode types. Sqsh_ino contains the unswapped base inode |
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* off disk. |
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*/ |
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static int squashfs_new_inode(struct super_block *sb, struct inode *inode, |
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struct squashfs_base_inode *sqsh_ino) |
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{ |
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uid_t i_uid; |
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gid_t i_gid; |
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int err; |
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err = squashfs_get_id(sb, le16_to_cpu(sqsh_ino->uid), &i_uid); |
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if (err) |
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return err; |
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err = squashfs_get_id(sb, le16_to_cpu(sqsh_ino->guid), &i_gid); |
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if (err) |
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return err; |
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i_uid_write(inode, i_uid); |
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i_gid_write(inode, i_gid); |
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inode->i_ino = le32_to_cpu(sqsh_ino->inode_number); |
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inode->i_mtime.tv_sec = le32_to_cpu(sqsh_ino->mtime); |
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inode->i_atime.tv_sec = inode->i_mtime.tv_sec; |
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inode->i_ctime.tv_sec = inode->i_mtime.tv_sec; |
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inode->i_mode = le16_to_cpu(sqsh_ino->mode); |
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inode->i_size = 0; |
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return err; |
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} |
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struct inode *squashfs_iget(struct super_block *sb, long long ino, |
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unsigned int ino_number) |
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{ |
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struct inode *inode = iget_locked(sb, ino_number); |
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int err; |
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TRACE("Entered squashfs_iget\n"); |
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if (!inode) |
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return ERR_PTR(-ENOMEM); |
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if (!(inode->i_state & I_NEW)) |
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return inode; |
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err = squashfs_read_inode(inode, ino); |
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if (err) { |
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iget_failed(inode); |
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return ERR_PTR(err); |
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} |
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unlock_new_inode(inode); |
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return inode; |
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} |
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/* |
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* Initialise VFS inode by reading inode from inode table (compressed |
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* metadata). The format and amount of data read depends on type. |
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*/ |
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int squashfs_read_inode(struct inode *inode, long long ino) |
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{ |
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struct super_block *sb = inode->i_sb; |
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struct squashfs_sb_info *msblk = sb->s_fs_info; |
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u64 block = SQUASHFS_INODE_BLK(ino) + msblk->inode_table; |
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int err, type, offset = SQUASHFS_INODE_OFFSET(ino); |
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union squashfs_inode squashfs_ino; |
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struct squashfs_base_inode *sqshb_ino = &squashfs_ino.base; |
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int xattr_id = SQUASHFS_INVALID_XATTR; |
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TRACE("Entered squashfs_read_inode\n"); |
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|
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/* |
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* Read inode base common to all inode types. |
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*/ |
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err = squashfs_read_metadata(sb, sqshb_ino, &block, |
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&offset, sizeof(*sqshb_ino)); |
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if (err < 0) |
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goto failed_read; |
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err = squashfs_new_inode(sb, inode, sqshb_ino); |
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if (err) |
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goto failed_read; |
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block = SQUASHFS_INODE_BLK(ino) + msblk->inode_table; |
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offset = SQUASHFS_INODE_OFFSET(ino); |
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type = le16_to_cpu(sqshb_ino->inode_type); |
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switch (type) { |
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case SQUASHFS_REG_TYPE: { |
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unsigned int frag_offset, frag; |
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int frag_size; |
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u64 frag_blk; |
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struct squashfs_reg_inode *sqsh_ino = &squashfs_ino.reg; |
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err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset, |
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sizeof(*sqsh_ino)); |
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if (err < 0) |
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goto failed_read; |
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frag = le32_to_cpu(sqsh_ino->fragment); |
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if (frag != SQUASHFS_INVALID_FRAG) { |
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frag_offset = le32_to_cpu(sqsh_ino->offset); |
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frag_size = squashfs_frag_lookup(sb, frag, &frag_blk); |
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if (frag_size < 0) { |
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err = frag_size; |
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goto failed_read; |
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} |
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} else { |
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frag_blk = SQUASHFS_INVALID_BLK; |
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frag_size = 0; |
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frag_offset = 0; |
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} |
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set_nlink(inode, 1); |
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inode->i_size = le32_to_cpu(sqsh_ino->file_size); |
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inode->i_fop = &generic_ro_fops; |
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inode->i_mode |= S_IFREG; |
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inode->i_blocks = ((inode->i_size - 1) >> 9) + 1; |
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squashfs_i(inode)->fragment_block = frag_blk; |
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squashfs_i(inode)->fragment_size = frag_size; |
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squashfs_i(inode)->fragment_offset = frag_offset; |
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squashfs_i(inode)->start = le32_to_cpu(sqsh_ino->start_block); |
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squashfs_i(inode)->block_list_start = block; |
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squashfs_i(inode)->offset = offset; |
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inode->i_data.a_ops = &squashfs_aops; |
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TRACE("File inode %x:%x, start_block %llx, block_list_start " |
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"%llx, offset %x\n", SQUASHFS_INODE_BLK(ino), |
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offset, squashfs_i(inode)->start, block, offset); |
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break; |
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} |
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case SQUASHFS_LREG_TYPE: { |
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unsigned int frag_offset, frag; |
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int frag_size; |
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u64 frag_blk; |
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struct squashfs_lreg_inode *sqsh_ino = &squashfs_ino.lreg; |
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err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset, |
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sizeof(*sqsh_ino)); |
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if (err < 0) |
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goto failed_read; |
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frag = le32_to_cpu(sqsh_ino->fragment); |
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if (frag != SQUASHFS_INVALID_FRAG) { |
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frag_offset = le32_to_cpu(sqsh_ino->offset); |
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frag_size = squashfs_frag_lookup(sb, frag, &frag_blk); |
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if (frag_size < 0) { |
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err = frag_size; |
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goto failed_read; |
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} |
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} else { |
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frag_blk = SQUASHFS_INVALID_BLK; |
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frag_size = 0; |
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frag_offset = 0; |
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} |
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xattr_id = le32_to_cpu(sqsh_ino->xattr); |
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set_nlink(inode, le32_to_cpu(sqsh_ino->nlink)); |
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inode->i_size = le64_to_cpu(sqsh_ino->file_size); |
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inode->i_op = &squashfs_inode_ops; |
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inode->i_fop = &generic_ro_fops; |
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inode->i_mode |= S_IFREG; |
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inode->i_blocks = (inode->i_size - |
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le64_to_cpu(sqsh_ino->sparse) + 511) >> 9; |
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squashfs_i(inode)->fragment_block = frag_blk; |
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squashfs_i(inode)->fragment_size = frag_size; |
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squashfs_i(inode)->fragment_offset = frag_offset; |
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squashfs_i(inode)->start = le64_to_cpu(sqsh_ino->start_block); |
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squashfs_i(inode)->block_list_start = block; |
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squashfs_i(inode)->offset = offset; |
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inode->i_data.a_ops = &squashfs_aops; |
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TRACE("File inode %x:%x, start_block %llx, block_list_start " |
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"%llx, offset %x\n", SQUASHFS_INODE_BLK(ino), |
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offset, squashfs_i(inode)->start, block, offset); |
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break; |
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} |
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case SQUASHFS_DIR_TYPE: { |
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struct squashfs_dir_inode *sqsh_ino = &squashfs_ino.dir; |
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err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset, |
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sizeof(*sqsh_ino)); |
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if (err < 0) |
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goto failed_read; |
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set_nlink(inode, le32_to_cpu(sqsh_ino->nlink)); |
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inode->i_size = le16_to_cpu(sqsh_ino->file_size); |
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inode->i_op = &squashfs_dir_inode_ops; |
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inode->i_fop = &squashfs_dir_ops; |
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inode->i_mode |= S_IFDIR; |
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squashfs_i(inode)->start = le32_to_cpu(sqsh_ino->start_block); |
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squashfs_i(inode)->offset = le16_to_cpu(sqsh_ino->offset); |
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squashfs_i(inode)->dir_idx_cnt = 0; |
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squashfs_i(inode)->parent = le32_to_cpu(sqsh_ino->parent_inode); |
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TRACE("Directory inode %x:%x, start_block %llx, offset %x\n", |
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SQUASHFS_INODE_BLK(ino), offset, |
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squashfs_i(inode)->start, |
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le16_to_cpu(sqsh_ino->offset)); |
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break; |
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} |
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case SQUASHFS_LDIR_TYPE: { |
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struct squashfs_ldir_inode *sqsh_ino = &squashfs_ino.ldir; |
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err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset, |
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sizeof(*sqsh_ino)); |
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if (err < 0) |
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goto failed_read; |
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xattr_id = le32_to_cpu(sqsh_ino->xattr); |
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set_nlink(inode, le32_to_cpu(sqsh_ino->nlink)); |
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inode->i_size = le32_to_cpu(sqsh_ino->file_size); |
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inode->i_op = &squashfs_dir_inode_ops; |
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inode->i_fop = &squashfs_dir_ops; |
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inode->i_mode |= S_IFDIR; |
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squashfs_i(inode)->start = le32_to_cpu(sqsh_ino->start_block); |
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squashfs_i(inode)->offset = le16_to_cpu(sqsh_ino->offset); |
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squashfs_i(inode)->dir_idx_start = block; |
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squashfs_i(inode)->dir_idx_offset = offset; |
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squashfs_i(inode)->dir_idx_cnt = le16_to_cpu(sqsh_ino->i_count); |
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squashfs_i(inode)->parent = le32_to_cpu(sqsh_ino->parent_inode); |
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TRACE("Long directory inode %x:%x, start_block %llx, offset " |
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"%x\n", SQUASHFS_INODE_BLK(ino), offset, |
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squashfs_i(inode)->start, |
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le16_to_cpu(sqsh_ino->offset)); |
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break; |
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} |
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case SQUASHFS_SYMLINK_TYPE: |
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case SQUASHFS_LSYMLINK_TYPE: { |
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struct squashfs_symlink_inode *sqsh_ino = &squashfs_ino.symlink; |
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err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset, |
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sizeof(*sqsh_ino)); |
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if (err < 0) |
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goto failed_read; |
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set_nlink(inode, le32_to_cpu(sqsh_ino->nlink)); |
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inode->i_size = le32_to_cpu(sqsh_ino->symlink_size); |
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inode->i_op = &squashfs_symlink_inode_ops; |
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inode_nohighmem(inode); |
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inode->i_data.a_ops = &squashfs_symlink_aops; |
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inode->i_mode |= S_IFLNK; |
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squashfs_i(inode)->start = block; |
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squashfs_i(inode)->offset = offset; |
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if (type == SQUASHFS_LSYMLINK_TYPE) { |
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__le32 xattr; |
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err = squashfs_read_metadata(sb, NULL, &block, |
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&offset, inode->i_size); |
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if (err < 0) |
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goto failed_read; |
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err = squashfs_read_metadata(sb, &xattr, &block, |
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&offset, sizeof(xattr)); |
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if (err < 0) |
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goto failed_read; |
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xattr_id = le32_to_cpu(xattr); |
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} |
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TRACE("Symbolic link inode %x:%x, start_block %llx, offset " |
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"%x\n", SQUASHFS_INODE_BLK(ino), offset, |
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block, offset); |
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break; |
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} |
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case SQUASHFS_BLKDEV_TYPE: |
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case SQUASHFS_CHRDEV_TYPE: { |
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struct squashfs_dev_inode *sqsh_ino = &squashfs_ino.dev; |
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unsigned int rdev; |
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err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset, |
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sizeof(*sqsh_ino)); |
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if (err < 0) |
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goto failed_read; |
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if (type == SQUASHFS_CHRDEV_TYPE) |
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inode->i_mode |= S_IFCHR; |
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else |
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inode->i_mode |= S_IFBLK; |
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set_nlink(inode, le32_to_cpu(sqsh_ino->nlink)); |
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rdev = le32_to_cpu(sqsh_ino->rdev); |
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init_special_inode(inode, inode->i_mode, new_decode_dev(rdev)); |
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TRACE("Device inode %x:%x, rdev %x\n", |
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SQUASHFS_INODE_BLK(ino), offset, rdev); |
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break; |
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} |
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case SQUASHFS_LBLKDEV_TYPE: |
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case SQUASHFS_LCHRDEV_TYPE: { |
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struct squashfs_ldev_inode *sqsh_ino = &squashfs_ino.ldev; |
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unsigned int rdev; |
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err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset, |
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sizeof(*sqsh_ino)); |
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if (err < 0) |
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goto failed_read; |
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if (type == SQUASHFS_LCHRDEV_TYPE) |
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inode->i_mode |= S_IFCHR; |
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else |
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inode->i_mode |= S_IFBLK; |
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xattr_id = le32_to_cpu(sqsh_ino->xattr); |
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inode->i_op = &squashfs_inode_ops; |
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set_nlink(inode, le32_to_cpu(sqsh_ino->nlink)); |
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rdev = le32_to_cpu(sqsh_ino->rdev); |
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init_special_inode(inode, inode->i_mode, new_decode_dev(rdev)); |
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TRACE("Device inode %x:%x, rdev %x\n", |
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SQUASHFS_INODE_BLK(ino), offset, rdev); |
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break; |
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} |
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case SQUASHFS_FIFO_TYPE: |
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case SQUASHFS_SOCKET_TYPE: { |
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struct squashfs_ipc_inode *sqsh_ino = &squashfs_ino.ipc; |
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err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset, |
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sizeof(*sqsh_ino)); |
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if (err < 0) |
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goto failed_read; |
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if (type == SQUASHFS_FIFO_TYPE) |
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inode->i_mode |= S_IFIFO; |
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else |
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inode->i_mode |= S_IFSOCK; |
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set_nlink(inode, le32_to_cpu(sqsh_ino->nlink)); |
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init_special_inode(inode, inode->i_mode, 0); |
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break; |
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} |
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case SQUASHFS_LFIFO_TYPE: |
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case SQUASHFS_LSOCKET_TYPE: { |
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struct squashfs_lipc_inode *sqsh_ino = &squashfs_ino.lipc; |
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err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset, |
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sizeof(*sqsh_ino)); |
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if (err < 0) |
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goto failed_read; |
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if (type == SQUASHFS_LFIFO_TYPE) |
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inode->i_mode |= S_IFIFO; |
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else |
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inode->i_mode |= S_IFSOCK; |
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xattr_id = le32_to_cpu(sqsh_ino->xattr); |
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inode->i_op = &squashfs_inode_ops; |
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set_nlink(inode, le32_to_cpu(sqsh_ino->nlink)); |
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init_special_inode(inode, inode->i_mode, 0); |
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break; |
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} |
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default: |
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ERROR("Unknown inode type %d in squashfs_iget!\n", type); |
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return -EINVAL; |
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} |
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if (xattr_id != SQUASHFS_INVALID_XATTR && msblk->xattr_id_table) { |
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err = squashfs_xattr_lookup(sb, xattr_id, |
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&squashfs_i(inode)->xattr_count, |
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&squashfs_i(inode)->xattr_size, |
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&squashfs_i(inode)->xattr); |
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if (err < 0) |
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goto failed_read; |
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inode->i_blocks += ((squashfs_i(inode)->xattr_size - 1) >> 9) |
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+ 1; |
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} else |
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squashfs_i(inode)->xattr_count = 0; |
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return 0; |
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failed_read: |
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ERROR("Unable to read inode 0x%llx\n", ino); |
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return err; |
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} |
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const struct inode_operations squashfs_inode_ops = { |
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.listxattr = squashfs_listxattr |
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}; |
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