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/* ext2.c - Second Extended filesystem */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2003,2004,2005,2007,2008,2009 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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/* Magic value used to identify an ext2 filesystem. */
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#define EXT2_MAGIC 0xEF53
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/* Amount of indirect blocks in an inode. */
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#define INDIRECT_BLOCKS 12
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/* The good old revision and the default inode size. */
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#define EXT2_GOOD_OLD_REVISION 0
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#define EXT2_GOOD_OLD_INODE_SIZE 128
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/* Filetype used in directory entry. */
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#define FILETYPE_UNKNOWN 0
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#define FILETYPE_REG 1
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#define FILETYPE_DIRECTORY 2
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#define FILETYPE_SYMLINK 7
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/* Filetype information as used in inodes. */
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#define FILETYPE_INO_MASK 0170000
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#define FILETYPE_INO_REG 0100000
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#define FILETYPE_INO_DIRECTORY 0040000
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#define FILETYPE_INO_SYMLINK 0120000
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#include <grub/err.h>
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#include <grub/file.h>
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#include <grub/mm.h>
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#include <grub/misc.h>
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#include <grub/disk.h>
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#include <grub/dl.h>
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#include <grub/types.h>
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#include <grub/fshelp.h>
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GRUB_MOD_LICENSE ("GPLv3+");
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/* Log2 size of ext2 block in 512 blocks. */
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#define LOG2_EXT2_BLOCK_SIZE(data) \
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(grub_le_to_cpu32 (data->sblock.log2_block_size) + 1)
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/* Log2 size of ext2 block in bytes. */
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#define LOG2_BLOCK_SIZE(data) \
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(grub_le_to_cpu32 (data->sblock.log2_block_size) + 10)
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/* The size of an ext2 block in bytes. */
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#define EXT2_BLOCK_SIZE(data) (1U << LOG2_BLOCK_SIZE (data))
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/* The revision level. */
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#define EXT2_REVISION(data) grub_le_to_cpu32 (data->sblock.revision_level)
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/* The inode size. */
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#define EXT2_INODE_SIZE(data) \
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(data->sblock.revision_level \
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== grub_cpu_to_le32_compile_time (EXT2_GOOD_OLD_REVISION) \
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? EXT2_GOOD_OLD_INODE_SIZE \
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: grub_le_to_cpu16 (data->sblock.inode_size))
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/* Superblock filesystem feature flags (RW compatible)
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* A filesystem with any of these enabled can be read and written by a driver
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* that does not understand them without causing metadata/data corruption. */
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#define EXT2_FEATURE_COMPAT_DIR_PREALLOC 0x0001
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#define EXT2_FEATURE_COMPAT_IMAGIC_INODES 0x0002
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#define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004
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#define EXT2_FEATURE_COMPAT_EXT_ATTR 0x0008
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#define EXT2_FEATURE_COMPAT_RESIZE_INODE 0x0010
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#define EXT2_FEATURE_COMPAT_DIR_INDEX 0x0020
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/* Superblock filesystem feature flags (RO compatible)
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* A filesystem with any of these enabled can be safely read by a driver that
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* does not understand them, but should not be written to, usually because
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* additional metadata is required. */
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#define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
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#define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
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#define EXT2_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
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#define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
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#define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
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#define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
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/* Superblock filesystem feature flags (back-incompatible)
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* A filesystem with any of these enabled should not be attempted to be read
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* by a driver that does not understand them, since they usually indicate
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* metadata format changes that might confuse the reader. */
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#define EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001
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#define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002
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#define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
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#define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Volume is journal device */
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#define EXT2_FEATURE_INCOMPAT_META_BG 0x0010
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#define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* Extents used */
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#define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
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#define EXT4_FEATURE_INCOMPAT_MMP 0x0100
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#define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
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#define EXT4_FEATURE_INCOMPAT_ENCRYPT 0x10000
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/* The set of back-incompatible features this driver DOES support. Add (OR)
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* flags here as the related features are implemented into the driver. */
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#define EXT2_DRIVER_SUPPORTED_INCOMPAT ( EXT2_FEATURE_INCOMPAT_FILETYPE \
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| EXT4_FEATURE_INCOMPAT_EXTENTS \
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| EXT4_FEATURE_INCOMPAT_FLEX_BG \
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| EXT2_FEATURE_INCOMPAT_META_BG \
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| EXT4_FEATURE_INCOMPAT_64BIT \
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| EXT4_FEATURE_INCOMPAT_ENCRYPT)
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/* List of rationales for the ignored "incompatible" features:
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* needs_recovery: Not really back-incompatible - was added as such to forbid
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* ext2 drivers from mounting an ext3 volume with a dirty
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* journal because they will ignore the journal, but the next
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* ext3 driver to mount the volume will find the journal and
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* replay it, potentially corrupting the metadata written by
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* the ext2 drivers. Safe to ignore for this RO driver.
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* mmp: Not really back-incompatible - was added as such to
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* avoid multiple read-write mounts. Safe to ignore for this
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* RO driver.
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*/
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#define EXT2_DRIVER_IGNORED_INCOMPAT ( EXT3_FEATURE_INCOMPAT_RECOVER \
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| EXT4_FEATURE_INCOMPAT_MMP)
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#define EXT3_JOURNAL_MAGIC_NUMBER 0xc03b3998U
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#define EXT3_JOURNAL_DESCRIPTOR_BLOCK 1
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#define EXT3_JOURNAL_COMMIT_BLOCK 2
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#define EXT3_JOURNAL_SUPERBLOCK_V1 3
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#define EXT3_JOURNAL_SUPERBLOCK_V2 4
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#define EXT3_JOURNAL_REVOKE_BLOCK 5
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#define EXT3_JOURNAL_FLAG_ESCAPE 1
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#define EXT3_JOURNAL_FLAG_SAME_UUID 2
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#define EXT3_JOURNAL_FLAG_DELETED 4
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#define EXT3_JOURNAL_FLAG_LAST_TAG 8
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#define EXT4_ENCRYPT_FLAG 0x800
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#define EXT4_EXTENTS_FLAG 0x80000
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/* The ext2 superblock. */
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struct grub_ext2_sblock
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{
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grub_uint32_t total_inodes;
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grub_uint32_t total_blocks;
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grub_uint32_t reserved_blocks;
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grub_uint32_t free_blocks;
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grub_uint32_t free_inodes;
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grub_uint32_t first_data_block;
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grub_uint32_t log2_block_size;
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grub_uint32_t log2_fragment_size;
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grub_uint32_t blocks_per_group;
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grub_uint32_t fragments_per_group;
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grub_uint32_t inodes_per_group;
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grub_uint32_t mtime;
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grub_uint32_t utime;
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grub_uint16_t mnt_count;
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grub_uint16_t max_mnt_count;
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grub_uint16_t magic;
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grub_uint16_t fs_state;
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grub_uint16_t error_handling;
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grub_uint16_t minor_revision_level;
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grub_uint32_t lastcheck;
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grub_uint32_t checkinterval;
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grub_uint32_t creator_os;
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grub_uint32_t revision_level;
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grub_uint16_t uid_reserved;
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grub_uint16_t gid_reserved;
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grub_uint32_t first_inode;
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grub_uint16_t inode_size;
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grub_uint16_t block_group_number;
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grub_uint32_t feature_compatibility;
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grub_uint32_t feature_incompat;
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grub_uint32_t feature_ro_compat;
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grub_uint16_t uuid[8];
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char volume_name[16];
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char last_mounted_on[64];
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grub_uint32_t compression_info;
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grub_uint8_t prealloc_blocks;
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grub_uint8_t prealloc_dir_blocks;
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grub_uint16_t reserved_gdt_blocks;
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grub_uint8_t journal_uuid[16];
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grub_uint32_t journal_inum;
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grub_uint32_t journal_dev;
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grub_uint32_t last_orphan;
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grub_uint32_t hash_seed[4];
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grub_uint8_t def_hash_version;
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grub_uint8_t jnl_backup_type;
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grub_uint16_t group_desc_size;
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grub_uint32_t default_mount_opts;
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grub_uint32_t first_meta_bg;
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grub_uint32_t mkfs_time;
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grub_uint32_t jnl_blocks[17];
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};
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/* The ext2 blockgroup. */
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struct grub_ext2_block_group
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{
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grub_uint32_t block_id;
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grub_uint32_t inode_id;
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grub_uint32_t inode_table_id;
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grub_uint16_t free_blocks;
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grub_uint16_t free_inodes;
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grub_uint16_t used_dirs;
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grub_uint16_t pad;
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grub_uint32_t reserved[3];
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grub_uint32_t block_id_hi;
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grub_uint32_t inode_id_hi;
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grub_uint32_t inode_table_id_hi;
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grub_uint16_t free_blocks_hi;
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grub_uint16_t free_inodes_hi;
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grub_uint16_t used_dirs_hi;
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grub_uint16_t pad2;
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grub_uint32_t reserved2[3];
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};
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/* The ext2 inode. */
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struct grub_ext2_inode
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{
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grub_uint16_t mode;
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grub_uint16_t uid;
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grub_uint32_t size;
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grub_uint32_t atime;
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grub_uint32_t ctime;
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grub_uint32_t mtime;
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grub_uint32_t dtime;
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grub_uint16_t gid;
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grub_uint16_t nlinks;
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grub_uint32_t blockcnt; /* Blocks of 512 bytes!! */
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grub_uint32_t flags;
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grub_uint32_t osd1;
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union
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{
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struct datablocks
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{
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grub_uint32_t dir_blocks[INDIRECT_BLOCKS];
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grub_uint32_t indir_block;
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grub_uint32_t double_indir_block;
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grub_uint32_t triple_indir_block;
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} blocks;
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char symlink[60];
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};
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grub_uint32_t version;
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grub_uint32_t acl;
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grub_uint32_t size_high;
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grub_uint32_t fragment_addr;
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grub_uint32_t osd2[3];
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};
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/* The header of an ext2 directory entry. */
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struct ext2_dirent
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{
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grub_uint32_t inode;
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grub_uint16_t direntlen;
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#define MAX_NAMELEN 255
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grub_uint8_t namelen;
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grub_uint8_t filetype;
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};
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struct grub_ext3_journal_header
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{
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grub_uint32_t magic;
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grub_uint32_t block_type;
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grub_uint32_t sequence;
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};
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struct grub_ext3_journal_revoke_header
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{
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struct grub_ext3_journal_header header;
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grub_uint32_t count;
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grub_uint32_t data[0];
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};
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struct grub_ext3_journal_block_tag
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{
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grub_uint32_t block;
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grub_uint32_t flags;
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};
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struct grub_ext3_journal_sblock
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{
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struct grub_ext3_journal_header header;
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grub_uint32_t block_size;
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grub_uint32_t maxlen;
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grub_uint32_t first;
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grub_uint32_t sequence;
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grub_uint32_t start;
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};
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#define EXT4_EXT_MAGIC 0xf30a
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struct grub_ext4_extent_header
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{
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grub_uint16_t magic;
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grub_uint16_t entries;
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grub_uint16_t max;
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grub_uint16_t depth;
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grub_uint32_t generation;
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};
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struct grub_ext4_extent
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{
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grub_uint32_t block;
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grub_uint16_t len;
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grub_uint16_t start_hi;
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grub_uint32_t start;
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};
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struct grub_ext4_extent_idx
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{
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grub_uint32_t block;
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grub_uint32_t leaf;
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grub_uint16_t leaf_hi;
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grub_uint16_t unused;
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};
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struct grub_fshelp_node
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{
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struct grub_ext2_data *data;
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struct grub_ext2_inode inode;
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int ino;
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int inode_read;
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};
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/* Information about a "mounted" ext2 filesystem. */
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struct grub_ext2_data
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{
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struct grub_ext2_sblock sblock;
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int log_group_desc_size;
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grub_disk_t disk;
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struct grub_ext2_inode *inode;
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struct grub_fshelp_node diropen;
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};
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static grub_dl_t my_mod;
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/* Check is a = b^x for some x. */
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static inline int
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is_power_of (grub_uint64_t a, grub_uint32_t b)
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{
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grub_uint64_t c;
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/* Prevent overflow assuming b < 8. */
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if (a >= (1LL << 60))
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return 0;
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for (c = 1; c <= a; c *= b);
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return (c == a);
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}
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static inline int
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group_has_super_block (struct grub_ext2_data *data, grub_uint64_t group)
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{
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if (!(data->sblock.feature_ro_compat
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& grub_cpu_to_le32_compile_time(EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER)))
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return 1;
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/* Algorithm looked up in Linux source. */
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if (group <= 1)
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return 1;
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/* Even number is never a power of odd number. */
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if (!(group & 1))
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return 0;
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return (is_power_of(group, 7) || is_power_of(group, 5) ||
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is_power_of(group, 3));
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}
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/* Read into BLKGRP the blockgroup descriptor of blockgroup GROUP of
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the mounted filesystem DATA. */
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inline static grub_err_t
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grub_ext2_blockgroup (struct grub_ext2_data *data, grub_uint64_t group,
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struct grub_ext2_block_group *blkgrp)
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{
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grub_uint64_t full_offset = (group << data->log_group_desc_size);
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grub_uint64_t block, offset;
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block = (full_offset >> LOG2_BLOCK_SIZE (data));
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offset = (full_offset & ((1 << LOG2_BLOCK_SIZE (data)) - 1));
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if ((data->sblock.feature_incompat
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& grub_cpu_to_le32_compile_time (EXT2_FEATURE_INCOMPAT_META_BG))
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&& block >= grub_le_to_cpu32(data->sblock.first_meta_bg))
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{
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grub_uint64_t first_block_group;
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/* Find the first block group for which a descriptor
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is stored in given block. */
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|
|
first_block_group = (block << (LOG2_BLOCK_SIZE (data)
|
|
|
- data->log_group_desc_size));
|
|
|
|
|
|
block = (first_block_group
|
|
|
* grub_le_to_cpu32(data->sblock.blocks_per_group));
|
|
|
|
|
|
if (group_has_super_block (data, first_block_group))
|
|
|
block++;
|
|
|
}
|
|
|
else
|
|
|
/* Superblock. */
|
|
|
block++;
|
|
|
return grub_disk_read (data->disk,
|
|
|
((grub_le_to_cpu32 (data->sblock.first_data_block)
|
|
|
+ block)
|
|
|
<< LOG2_EXT2_BLOCK_SIZE (data)), offset,
|
|
|
sizeof (struct grub_ext2_block_group), blkgrp);
|
|
|
}
|
|
|
|
|
|
static struct grub_ext4_extent_header *
|
|
|
grub_ext4_find_leaf (struct grub_ext2_data *data,
|
|
|
struct grub_ext4_extent_header *ext_block,
|
|
|
grub_uint32_t fileblock)
|
|
|
{
|
|
|
struct grub_ext4_extent_idx *index;
|
|
|
void *buf = NULL;
|
|
|
|
|
|
while (1)
|
|
|
{
|
|
|
int i;
|
|
|
grub_disk_addr_t block;
|
|
|
|
|
|
index = (struct grub_ext4_extent_idx *) (ext_block + 1);
|
|
|
|
|
|
if (ext_block->magic != grub_cpu_to_le16_compile_time (EXT4_EXT_MAGIC))
|
|
|
goto fail;
|
|
|
|
|
|
if (ext_block->depth == 0)
|
|
|
return ext_block;
|
|
|
|
|
|
for (i = 0; i < grub_le_to_cpu16 (ext_block->entries); i++)
|
|
|
{
|
|
|
if (fileblock < grub_le_to_cpu32(index[i].block))
|
|
|
break;
|
|
|
}
|
|
|
|
|
|
if (--i < 0)
|
|
|
goto fail;
|
|
|
|
|
|
block = grub_le_to_cpu16 (index[i].leaf_hi);
|
|
|
block = (block << 32) | grub_le_to_cpu32 (index[i].leaf);
|
|
|
if (!buf)
|
|
|
buf = grub_malloc (EXT2_BLOCK_SIZE(data));
|
|
|
if (!buf)
|
|
|
goto fail;
|
|
|
if (grub_disk_read (data->disk,
|
|
|
block << LOG2_EXT2_BLOCK_SIZE (data),
|
|
|
0, EXT2_BLOCK_SIZE(data), buf))
|
|
|
goto fail;
|
|
|
|
|
|
ext_block = buf;
|
|
|
}
|
|
|
fail:
|
|
|
grub_free (buf);
|
|
|
return 0;
|
|
|
}
|
|
|
|
|
|
static grub_disk_addr_t
|
|
|
grub_ext2_read_block (grub_fshelp_node_t node, grub_disk_addr_t fileblock)
|
|
|
{
|
|
|
struct grub_ext2_data *data = node->data;
|
|
|
struct grub_ext2_inode *inode = &node->inode;
|
|
|
unsigned int blksz = EXT2_BLOCK_SIZE (data);
|
|
|
grub_disk_addr_t blksz_quarter = blksz / 4;
|
|
|
int log2_blksz = LOG2_EXT2_BLOCK_SIZE (data);
|
|
|
int log_perblock = log2_blksz + 9 - 2;
|
|
|
grub_uint32_t indir;
|
|
|
int shift;
|
|
|
|
|
|
if (inode->flags & grub_cpu_to_le32_compile_time (EXT4_EXTENTS_FLAG))
|
|
|
{
|
|
|
struct grub_ext4_extent_header *leaf;
|
|
|
struct grub_ext4_extent *ext;
|
|
|
int i;
|
|
|
grub_disk_addr_t ret;
|
|
|
|
|
|
leaf = grub_ext4_find_leaf (data, (struct grub_ext4_extent_header *) inode->blocks.dir_blocks, fileblock);
|
|
|
if (! leaf)
|
|
|
{
|
|
|
grub_error (GRUB_ERR_BAD_FS, "invalid extent");
|
|
|
return -1;
|
|
|
}
|
|
|
|
|
|
ext = (struct grub_ext4_extent *) (leaf + 1);
|
|
|
for (i = 0; i < grub_le_to_cpu16 (leaf->entries); i++)
|
|
|
{
|
|
|
if (fileblock < grub_le_to_cpu32 (ext[i].block))
|
|
|
break;
|
|
|
}
|
|
|
|
|
|
if (--i >= 0)
|
|
|
{
|
|
|
fileblock -= grub_le_to_cpu32 (ext[i].block);
|
|
|
if (fileblock >= grub_le_to_cpu16 (ext[i].len))
|
|
|
ret = 0;
|
|
|
else
|
|
|
{
|
|
|
grub_disk_addr_t start;
|
|
|
|
|
|
start = grub_le_to_cpu16 (ext[i].start_hi);
|
|
|
start = (start << 32) + grub_le_to_cpu32 (ext[i].start);
|
|
|
|
|
|
ret = fileblock + start;
|
|
|
}
|
|
|
}
|
|
|
else
|
|
|
{
|
|
|
grub_error (GRUB_ERR_BAD_FS, "something wrong with extent");
|
|
|
ret = -1;
|
|
|
}
|
|
|
|
|
|
if (leaf != (struct grub_ext4_extent_header *) inode->blocks.dir_blocks)
|
|
|
grub_free (leaf);
|
|
|
|
|
|
return ret;
|
|
|
}
|
|
|
|
|
|
/* Direct blocks. */
|
|
|
if (fileblock < INDIRECT_BLOCKS)
|
|
|
return grub_le_to_cpu32 (inode->blocks.dir_blocks[fileblock]);
|
|
|
fileblock -= INDIRECT_BLOCKS;
|
|
|
/* Indirect. */
|
|
|
if (fileblock < blksz_quarter)
|
|
|
{
|
|
|
indir = inode->blocks.indir_block;
|
|
|
shift = 0;
|
|
|
goto indirect;
|
|
|
}
|
|
|
fileblock -= blksz_quarter;
|
|
|
/* Double indirect. */
|
|
|
if (fileblock < blksz_quarter * blksz_quarter)
|
|
|
{
|
|
|
indir = inode->blocks.double_indir_block;
|
|
|
shift = 1;
|
|
|
goto indirect;
|
|
|
}
|
|
|
fileblock -= blksz_quarter * blksz_quarter;
|
|
|
/* Triple indirect. */
|
|
|
if (fileblock < blksz_quarter * blksz_quarter * (blksz_quarter + 1))
|
|
|
{
|
|
|
indir = inode->blocks.triple_indir_block;
|
|
|
shift = 2;
|
|
|
goto indirect;
|
|
|
}
|
|
|
grub_error (GRUB_ERR_BAD_FS,
|
|
|
"ext2fs doesn't support quadruple indirect blocks");
|
|
|
return -1;
|
|
|
|
|
|
indirect:
|
|
|
do {
|
|
|
/* If the indirect block is zero, all child blocks are absent
|
|
|
(i.e. filled with zeros.) */
|
|
|
if (indir == 0)
|
|
|
return 0;
|
|
|
if (grub_disk_read (data->disk,
|
|
|
((grub_disk_addr_t) grub_le_to_cpu32 (indir))
|
|
|
<< log2_blksz,
|
|
|
((fileblock >> (log_perblock * shift))
|
|
|
& ((1 << log_perblock) - 1))
|
|
|
* sizeof (indir),
|
|
|
sizeof (indir), &indir))
|
|
|
return -1;
|
|
|
} while (shift--);
|
|
|
|
|
|
return grub_le_to_cpu32 (indir);
|
|
|
}
|
|
|
|
|
|
/* Read LEN bytes from the file described by DATA starting with byte
|
|
|
POS. Return the amount of read bytes in READ. */
|
|
|
static grub_ssize_t
|
|
|
grub_ext2_read_file (grub_fshelp_node_t node,
|
|
|
grub_disk_read_hook_t read_hook, void *read_hook_data,
|
|
|
grub_off_t pos, grub_size_t len, char *buf)
|
|
|
{
|
|
|
return grub_fshelp_read_file (node->data->disk, node,
|
|
|
read_hook, read_hook_data,
|
|
|
pos, len, buf, grub_ext2_read_block,
|
|
|
grub_cpu_to_le32 (node->inode.size)
|
|
|
| (((grub_off_t) grub_cpu_to_le32 (node->inode.size_high)) << 32),
|
|
|
LOG2_EXT2_BLOCK_SIZE (node->data), 0);
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
/* Read the inode INO for the file described by DATA into INODE. */
|
|
|
static grub_err_t
|
|
|
grub_ext2_read_inode (struct grub_ext2_data *data,
|
|
|
int ino, struct grub_ext2_inode *inode)
|
|
|
{
|
|
|
struct grub_ext2_block_group blkgrp;
|
|
|
struct grub_ext2_sblock *sblock = &data->sblock;
|
|
|
int inodes_per_block;
|
|
|
unsigned int blkno;
|
|
|
unsigned int blkoff;
|
|
|
grub_disk_addr_t base;
|
|
|
|
|
|
/* It is easier to calculate if the first inode is 0. */
|
|
|
ino--;
|
|
|
|
|
|
grub_ext2_blockgroup (data,
|
|
|
ino / grub_le_to_cpu32 (sblock->inodes_per_group),
|
|
|
&blkgrp);
|
|
|
if (grub_errno)
|
|
|
return grub_errno;
|
|
|
|
|
|
inodes_per_block = EXT2_BLOCK_SIZE (data) / EXT2_INODE_SIZE (data);
|
|
|
blkno = (ino % grub_le_to_cpu32 (sblock->inodes_per_group))
|
|
|
/ inodes_per_block;
|
|
|
blkoff = (ino % grub_le_to_cpu32 (sblock->inodes_per_group))
|
|
|
% inodes_per_block;
|
|
|
|
|
|
base = grub_le_to_cpu32 (blkgrp.inode_table_id);
|
|
|
if (data->log_group_desc_size >= 6)
|
|
|
base |= (((grub_disk_addr_t) grub_le_to_cpu32 (blkgrp.inode_table_id_hi))
|
|
|
<< 32);
|
|
|
|
|
|
/* Read the inode. */
|
|
|
if (grub_disk_read (data->disk,
|
|
|
((base + blkno) << LOG2_EXT2_BLOCK_SIZE (data)),
|
|
|
EXT2_INODE_SIZE (data) * blkoff,
|
|
|
sizeof (struct grub_ext2_inode), inode))
|
|
|
return grub_errno;
|
|
|
|
|
|
return 0;
|
|
|
}
|
|
|
|
|
|
static struct grub_ext2_data *
|
|
|
grub_ext2_mount (grub_disk_t disk)
|
|
|
{
|
|
|
struct grub_ext2_data *data;
|
|
|
|
|
|
data = grub_malloc (sizeof (struct grub_ext2_data));
|
|
|
if (!data)
|
|
|
return 0;
|
|
|
|
|
|
/* Read the superblock. */
|
|
|
grub_disk_read (disk, 1 * 2, 0, sizeof (struct grub_ext2_sblock),
|
|
|
&data->sblock);
|
|
|
if (grub_errno)
|
|
|
goto fail;
|
|
|
|
|
|
/* Make sure this is an ext2 filesystem. */
|
|
|
if (data->sblock.magic != grub_cpu_to_le16_compile_time (EXT2_MAGIC)
|
|
|
|| grub_le_to_cpu32 (data->sblock.log2_block_size) >= 16
|
|
|
|| data->sblock.inodes_per_group == 0
|
|
|
/* 20 already means 1GiB blocks. We don't want to deal with blocks overflowing int32. */
|
|
|
|| grub_le_to_cpu32 (data->sblock.log2_block_size) > 20
|
|
|
|| EXT2_INODE_SIZE (data) == 0
|
|
|
|| EXT2_BLOCK_SIZE (data) / EXT2_INODE_SIZE (data) == 0)
|
|
|
{
|
|
|
grub_error (GRUB_ERR_BAD_FS, "not an ext2 filesystem");
|
|
|
goto fail;
|
|
|
}
|
|
|
|
|
|
/* Check the FS doesn't have feature bits enabled that we don't support. */
|
|
|
if (data->sblock.revision_level != grub_cpu_to_le32_compile_time (EXT2_GOOD_OLD_REVISION)
|
|
|
&& (data->sblock.feature_incompat
|
|
|
& grub_cpu_to_le32_compile_time (~(EXT2_DRIVER_SUPPORTED_INCOMPAT
|
|
|
| EXT2_DRIVER_IGNORED_INCOMPAT))))
|
|
|
{
|
|
|
grub_error (GRUB_ERR_BAD_FS, "filesystem has unsupported incompatible features");
|
|
|
goto fail;
|
|
|
}
|
|
|
|
|
|
if (data->sblock.revision_level != grub_cpu_to_le32_compile_time (EXT2_GOOD_OLD_REVISION)
|
|
|
&& (data->sblock.feature_incompat
|
|
|
& grub_cpu_to_le32_compile_time (EXT4_FEATURE_INCOMPAT_64BIT))
|
|
|
&& data->sblock.group_desc_size != 0
|
|
|
&& ((data->sblock.group_desc_size & (data->sblock.group_desc_size - 1))
|
|
|
== 0)
|
|
|
&& (data->sblock.group_desc_size & grub_cpu_to_le16_compile_time (0x1fe0)))
|
|
|
{
|
|
|
grub_uint16_t b = grub_le_to_cpu16 (data->sblock.group_desc_size);
|
|
|
for (data->log_group_desc_size = 0; b != (1 << data->log_group_desc_size);
|
|
|
data->log_group_desc_size++);
|
|
|
}
|
|
|
else
|
|
|
data->log_group_desc_size = 5;
|
|
|
|
|
|
data->disk = disk;
|
|
|
|
|
|
data->diropen.data = data;
|
|
|
data->diropen.ino = 2;
|
|
|
data->diropen.inode_read = 1;
|
|
|
|
|
|
data->inode = &data->diropen.inode;
|
|
|
|
|
|
grub_ext2_read_inode (data, 2, data->inode);
|
|
|
if (grub_errno)
|
|
|
goto fail;
|
|
|
|
|
|
return data;
|
|
|
|
|
|
fail:
|
|
|
if (grub_errno == GRUB_ERR_OUT_OF_RANGE)
|
|
|
grub_error (GRUB_ERR_BAD_FS, "not an ext2 filesystem");
|
|
|
|
|
|
grub_free (data);
|
|
|
return 0;
|
|
|
}
|
|
|
|
|
|
static char *
|
|
|
grub_ext2_read_symlink (grub_fshelp_node_t node)
|
|
|
{
|
|
|
char *symlink;
|
|
|
struct grub_fshelp_node *diro = node;
|
|
|
|
|
|
if (! diro->inode_read)
|
|
|
{
|
|
|
grub_ext2_read_inode (diro->data, diro->ino, &diro->inode);
|
|
|
if (grub_errno)
|
|
|
return 0;
|
|
|
|
|
|
if (diro->inode.flags & grub_cpu_to_le32_compile_time (EXT4_ENCRYPT_FLAG))
|
|
|
{
|
|
|
grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET, "symlink is encrypted");
|
|
|
return 0;
|
|
|
}
|
|
|
}
|
|
|
|
|
|
symlink = grub_malloc (grub_le_to_cpu32 (diro->inode.size) + 1);
|
|
|
if (! symlink)
|
|
|
return 0;
|
|
|
|
|
|
/* If the filesize of the symlink is bigger than
|
|
|
60 the symlink is stored in a separate block,
|
|
|
otherwise it is stored in the inode. */
|
|
|
if (grub_le_to_cpu32 (diro->inode.size) <= sizeof (diro->inode.symlink))
|
|
|
grub_memcpy (symlink,
|
|
|
diro->inode.symlink,
|
|
|
grub_le_to_cpu32 (diro->inode.size));
|
|
|
else
|
|
|
{
|
|
|
grub_ext2_read_file (diro, 0, 0, 0,
|
|
|
grub_le_to_cpu32 (diro->inode.size),
|
|
|
symlink);
|
|
|
if (grub_errno)
|
|
|
{
|
|
|
grub_free (symlink);
|
|
|
return 0;
|
|
|
}
|
|
|
}
|
|
|
|
|
|
symlink[grub_le_to_cpu32 (diro->inode.size)] = '\0';
|
|
|
return symlink;
|
|
|
}
|
|
|
|
|
|
static int
|
|
|
grub_ext2_iterate_dir (grub_fshelp_node_t dir,
|
|
|
grub_fshelp_iterate_dir_hook_t hook, void *hook_data)
|
|
|
{
|
|
|
unsigned int fpos = 0;
|
|
|
struct grub_fshelp_node *diro = (struct grub_fshelp_node *) dir;
|
|
|
|
|
|
if (! diro->inode_read)
|
|
|
{
|
|
|
grub_ext2_read_inode (diro->data, diro->ino, &diro->inode);
|
|
|
if (grub_errno)
|
|
|
return 0;
|
|
|
}
|
|
|
|
|
|
if (diro->inode.flags & grub_cpu_to_le32_compile_time (EXT4_ENCRYPT_FLAG))
|
|
|
{
|
|
|
grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET, "directory is encrypted");
|
|
|
return 0;
|
|
|
}
|
|
|
|
|
|
/* Search the file. */
|
|
|
while (fpos < grub_le_to_cpu32 (diro->inode.size))
|
|
|
{
|
|
|
struct ext2_dirent dirent;
|
|
|
|
|
|
grub_ext2_read_file (diro, 0, 0, fpos, sizeof (struct ext2_dirent),
|
|
|
(char *) &dirent);
|
|
|
if (grub_errno)
|
|
|
return 0;
|
|
|
|
|
|
if (dirent.direntlen == 0)
|
|
|
return 0;
|
|
|
|
|
|
if (dirent.inode != 0 && dirent.namelen != 0)
|
|
|
{
|
|
|
char filename[MAX_NAMELEN + 1];
|
|
|
struct grub_fshelp_node *fdiro;
|
|
|
enum grub_fshelp_filetype type = GRUB_FSHELP_UNKNOWN;
|
|
|
|
|
|
grub_ext2_read_file (diro, 0, 0, fpos + sizeof (struct ext2_dirent),
|
|
|
dirent.namelen, filename);
|
|
|
if (grub_errno)
|
|
|
return 0;
|
|
|
|
|
|
fdiro = grub_malloc (sizeof (struct grub_fshelp_node));
|
|
|
if (! fdiro)
|
|
|
return 0;
|
|
|
|
|
|
fdiro->data = diro->data;
|
|
|
fdiro->ino = grub_le_to_cpu32 (dirent.inode);
|
|
|
|
|
|
filename[dirent.namelen] = '\0';
|
|
|
|
|
|
if (dirent.filetype != FILETYPE_UNKNOWN)
|
|
|
{
|
|
|
fdiro->inode_read = 0;
|
|
|
|
|
|
if (dirent.filetype == FILETYPE_DIRECTORY)
|
|
|
type = GRUB_FSHELP_DIR;
|
|
|
else if (dirent.filetype == FILETYPE_SYMLINK)
|
|
|
type = GRUB_FSHELP_SYMLINK;
|
|
|
else if (dirent.filetype == FILETYPE_REG)
|
|
|
type = GRUB_FSHELP_REG;
|
|
|
}
|
|
|
else
|
|
|
{
|
|
|
/* The filetype can not be read from the dirent, read
|
|
|
the inode to get more information. */
|
|
|
grub_ext2_read_inode (diro->data,
|
|
|
grub_le_to_cpu32 (dirent.inode),
|
|
|
&fdiro->inode);
|
|
|
if (grub_errno)
|
|
|
{
|
|
|
grub_free (fdiro);
|
|
|
return 0;
|
|
|
}
|
|
|
|
|
|
fdiro->inode_read = 1;
|
|
|
|
|
|
if ((grub_le_to_cpu16 (fdiro->inode.mode)
|
|
|
& FILETYPE_INO_MASK) == FILETYPE_INO_DIRECTORY)
|
|
|
type = GRUB_FSHELP_DIR;
|
|
|
else if ((grub_le_to_cpu16 (fdiro->inode.mode)
|
|
|
& FILETYPE_INO_MASK) == FILETYPE_INO_SYMLINK)
|
|
|
type = GRUB_FSHELP_SYMLINK;
|
|
|
else if ((grub_le_to_cpu16 (fdiro->inode.mode)
|
|
|
& FILETYPE_INO_MASK) == FILETYPE_INO_REG)
|
|
|
type = GRUB_FSHELP_REG;
|
|
|
}
|
|
|
|
|
|
if (hook (filename, type, fdiro, hook_data))
|
|
|
return 1;
|
|
|
}
|
|
|
|
|
|
fpos += grub_le_to_cpu16 (dirent.direntlen);
|
|
|
}
|
|
|
|
|
|
return 0;
|
|
|
}
|
|
|
|
|
|
/* Open a file named NAME and initialize FILE. */
|
|
|
static grub_err_t
|
|
|
grub_ext2_open (struct grub_file *file, const char *name)
|
|
|
{
|
|
|
struct grub_ext2_data *data;
|
|
|
struct grub_fshelp_node *fdiro = 0;
|
|
|
grub_err_t err;
|
|
|
|
|
|
grub_dl_ref (my_mod);
|
|
|
|
|
|
data = grub_ext2_mount (file->device->disk);
|
|
|
if (! data)
|
|
|
{
|
|
|
err = grub_errno;
|
|
|
goto fail;
|
|
|
}
|
|
|
|
|
|
err = grub_fshelp_find_file (name, &data->diropen, &fdiro,
|
|
|
grub_ext2_iterate_dir,
|
|
|
grub_ext2_read_symlink, GRUB_FSHELP_REG);
|
|
|
if (err)
|
|
|
goto fail;
|
|
|
|
|
|
if (! fdiro->inode_read)
|
|
|
{
|
|
|
err = grub_ext2_read_inode (data, fdiro->ino, &fdiro->inode);
|
|
|
if (err)
|
|
|
goto fail;
|
|
|
}
|
|
|
|
|
|
if (fdiro->inode.flags & grub_cpu_to_le32_compile_time (EXT4_ENCRYPT_FLAG))
|
|
|
{
|
|
|
err = grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET, "file is encrypted");
|
|
|
goto fail;
|
|
|
}
|
|
|
|
|
|
grub_memcpy (data->inode, &fdiro->inode, sizeof (struct grub_ext2_inode));
|
|
|
grub_free (fdiro);
|
|
|
|
|
|
file->size = grub_le_to_cpu32 (data->inode->size);
|
|
|
file->size |= ((grub_off_t) grub_le_to_cpu32 (data->inode->size_high)) << 32;
|
|
|
file->data = data;
|
|
|
file->offset = 0;
|
|
|
|
|
|
return 0;
|
|
|
|
|
|
fail:
|
|
|
if (fdiro != &data->diropen)
|
|
|
grub_free (fdiro);
|
|
|
grub_free (data);
|
|
|
|
|
|
grub_dl_unref (my_mod);
|
|
|
|
|
|
return err;
|
|
|
}
|
|
|
|
|
|
static grub_err_t
|
|
|
grub_ext2_close (grub_file_t file)
|
|
|
{
|
|
|
grub_free (file->data);
|
|
|
|
|
|
grub_dl_unref (my_mod);
|
|
|
|
|
|
return GRUB_ERR_NONE;
|
|
|
}
|
|
|
|
|
|
/* Read LEN bytes data from FILE into BUF. */
|
|
|
static grub_ssize_t
|
|
|
grub_ext2_read (grub_file_t file, char *buf, grub_size_t len)
|
|
|
{
|
|
|
struct grub_ext2_data *data = (struct grub_ext2_data *) file->data;
|
|
|
|
|
|
return grub_ext2_read_file (&data->diropen,
|
|
|
file->read_hook, file->read_hook_data,
|
|
|
file->offset, len, buf);
|
|
|
}
|
|
|
|
|
|
|
|
|
/* Context for grub_ext2_dir. */
|
|
|
struct grub_ext2_dir_ctx
|
|
|
{
|
|
|
grub_fs_dir_hook_t hook;
|
|
|
void *hook_data;
|
|
|
struct grub_ext2_data *data;
|
|
|
};
|
|
|
|
|
|
/* Helper for grub_ext2_dir. */
|
|
|
static int
|
|
|
grub_ext2_dir_iter (const char *filename, enum grub_fshelp_filetype filetype,
|
|
|
grub_fshelp_node_t node, void *data)
|
|
|
{
|
|
|
struct grub_ext2_dir_ctx *ctx = data;
|
|
|
struct grub_dirhook_info info;
|
|
|
|
|
|
grub_memset (&info, 0, sizeof (info));
|
|
|
if (! node->inode_read)
|
|
|
{
|
|
|
grub_ext2_read_inode (ctx->data, node->ino, &node->inode);
|
|
|
if (!grub_errno)
|
|
|
node->inode_read = 1;
|
|
|
grub_errno = GRUB_ERR_NONE;
|
|
|
}
|
|
|
if (node->inode_read)
|
|
|
{
|
|
|
info.mtimeset = 1;
|
|
|
info.mtime = grub_le_to_cpu32 (node->inode.mtime);
|
|
|
}
|
|
|
|
|
|
info.dir = ((filetype & GRUB_FSHELP_TYPE_MASK) == GRUB_FSHELP_DIR);
|
|
|
if (!info.dir)
|
|
|
info.size = (((grub_off_t) grub_le_to_cpu32 (node->inode.size_high)) << 32) | grub_le_to_cpu32 (node->inode.size);
|
|
|
grub_free (node);
|
|
|
return ctx->hook (filename, &info, ctx->hook_data);
|
|
|
}
|
|
|
|
|
|
static grub_err_t
|
|
|
grub_ext2_dir (grub_device_t device, const char *path, grub_fs_dir_hook_t hook,
|
|
|
void *hook_data)
|
|
|
{
|
|
|
struct grub_ext2_dir_ctx ctx = {
|
|
|
.hook = hook,
|
|
|
.hook_data = hook_data
|
|
|
};
|
|
|
struct grub_fshelp_node *fdiro = 0;
|
|
|
|
|
|
grub_dl_ref (my_mod);
|
|
|
|
|
|
ctx.data = grub_ext2_mount (device->disk);
|
|
|
if (! ctx.data)
|
|
|
goto fail;
|
|
|
|
|
|
grub_fshelp_find_file (path, &ctx.data->diropen, &fdiro,
|
|
|
grub_ext2_iterate_dir, grub_ext2_read_symlink,
|
|
|
GRUB_FSHELP_DIR);
|
|
|
if (grub_errno)
|
|
|
goto fail;
|
|
|
|
|
|
grub_ext2_iterate_dir (fdiro, grub_ext2_dir_iter, &ctx);
|
|
|
|
|
|
fail:
|
|
|
if (fdiro != &ctx.data->diropen)
|
|
|
grub_free (fdiro);
|
|
|
grub_free (ctx.data);
|
|
|
|
|
|
grub_dl_unref (my_mod);
|
|
|
|
|
|
return grub_errno;
|
|
|
}
|
|
|
|
|
|
static grub_err_t
|
|
|
grub_ext2_label (grub_device_t device, char **label)
|
|
|
{
|
|
|
struct grub_ext2_data *data;
|
|
|
grub_disk_t disk = device->disk;
|
|
|
|
|
|
grub_dl_ref (my_mod);
|
|
|
|
|
|
data = grub_ext2_mount (disk);
|
|
|
if (data)
|
|
|
*label = grub_strndup (data->sblock.volume_name,
|
|
|
sizeof (data->sblock.volume_name));
|
|
|
else
|
|
|
*label = NULL;
|
|
|
|
|
|
grub_dl_unref (my_mod);
|
|
|
|
|
|
grub_free (data);
|
|
|
|
|
|
return grub_errno;
|
|
|
}
|
|
|
|
|
|
static grub_err_t
|
|
|
grub_ext2_uuid (grub_device_t device, char **uuid)
|
|
|
{
|
|
|
struct grub_ext2_data *data;
|
|
|
grub_disk_t disk = device->disk;
|
|
|
|
|
|
grub_dl_ref (my_mod);
|
|
|
|
|
|
data = grub_ext2_mount (disk);
|
|
|
if (data)
|
|
|
{
|
|
|
*uuid = grub_xasprintf ("%04x%04x-%04x-%04x-%04x-%04x%04x%04x",
|
|
|
grub_be_to_cpu16 (data->sblock.uuid[0]),
|
|
|
grub_be_to_cpu16 (data->sblock.uuid[1]),
|
|
|
grub_be_to_cpu16 (data->sblock.uuid[2]),
|
|
|
grub_be_to_cpu16 (data->sblock.uuid[3]),
|
|
|
grub_be_to_cpu16 (data->sblock.uuid[4]),
|
|
|
grub_be_to_cpu16 (data->sblock.uuid[5]),
|
|
|
grub_be_to_cpu16 (data->sblock.uuid[6]),
|
|
|
grub_be_to_cpu16 (data->sblock.uuid[7]));
|
|
|
}
|
|
|
else
|
|
|
*uuid = NULL;
|
|
|
|
|
|
grub_dl_unref (my_mod);
|
|
|
|
|
|
grub_free (data);
|
|
|
|
|
|
return grub_errno;
|
|
|
}
|
|
|
|
|
|
/* Get mtime. */
|
|
|
static grub_err_t
|
|
|
grub_ext2_mtime (grub_device_t device, grub_int32_t *tm)
|
|
|
{
|
|
|
struct grub_ext2_data *data;
|
|
|
grub_disk_t disk = device->disk;
|
|
|
|
|
|
grub_dl_ref (my_mod);
|
|
|
|
|
|
data = grub_ext2_mount (disk);
|
|
|
if (!data)
|
|
|
*tm = 0;
|
|
|
else
|
|
|
*tm = grub_le_to_cpu32 (data->sblock.utime);
|
|
|
|
|
|
grub_dl_unref (my_mod);
|
|
|
|
|
|
grub_free (data);
|
|
|
|
|
|
return grub_errno;
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
static struct grub_fs grub_ext2_fs =
|
|
|
{
|
|
|
.name = "ext2",
|
|
|
.fs_dir = grub_ext2_dir,
|
|
|
.fs_open = grub_ext2_open,
|
|
|
.fs_read = grub_ext2_read,
|
|
|
.fs_close = grub_ext2_close,
|
|
|
.fs_label = grub_ext2_label,
|
|
|
.fs_uuid = grub_ext2_uuid,
|
|
|
.fs_mtime = grub_ext2_mtime,
|
|
|
#ifdef GRUB_UTIL
|
|
|
.reserved_first_sector = 1,
|
|
|
.blocklist_install = 1,
|
|
|
#endif
|
|
|
.next = 0
|
|
|
};
|
|
|
|
|
|
GRUB_MOD_INIT(ext2)
|
|
|
{
|
|
|
grub_fs_register (&grub_ext2_fs);
|
|
|
my_mod = mod;
|
|
|
}
|
|
|
|
|
|
GRUB_MOD_FINI(ext2)
|
|
|
{
|
|
|
grub_fs_unregister (&grub_ext2_fs);
|
|
|
}
|