1151 lines
32 KiB
C
1151 lines
32 KiB
C
/* xfs.c - XFS. */
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/*
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* VasEBoot -- GRand Unified Bootloader
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* Copyright (C) 2005,2006,2007,2008,2009 Free Software Foundation, Inc.
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*
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* VasEBoot 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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* VasEBoot 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 VasEBoot. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <VasEBoot/err.h>
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#include <VasEBoot/file.h>
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#include <VasEBoot/mm.h>
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#include <VasEBoot/misc.h>
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#include <VasEBoot/disk.h>
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#include <VasEBoot/dl.h>
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#include <VasEBoot/types.h>
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#include <VasEBoot/fshelp.h>
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VasEBoot_MOD_LICENSE ("GPLv3+");
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#define XFS_INODE_EXTENTS 9
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#define XFS_INODE_FORMAT_INO 1
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#define XFS_INODE_FORMAT_EXT 2
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#define XFS_INODE_FORMAT_BTREE 3
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/* Superblock version field flags */
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#define XFS_SB_VERSION_NUMBITS 0x000f
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#define XFS_SB_VERSION_ATTRBIT 0x0010
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#define XFS_SB_VERSION_NLINKBIT 0x0020
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#define XFS_SB_VERSION_QUOTABIT 0x0040
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#define XFS_SB_VERSION_ALIGNBIT 0x0080
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#define XFS_SB_VERSION_DALIGNBIT 0x0100
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#define XFS_SB_VERSION_LOGV2BIT 0x0400
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#define XFS_SB_VERSION_SECTORBIT 0x0800
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#define XFS_SB_VERSION_EXTFLGBIT 0x1000
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#define XFS_SB_VERSION_DIRV2BIT 0x2000
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#define XFS_SB_VERSION_MOREBITSBIT 0x8000
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#define XFS_SB_VERSION_BITS_SUPPORTED \
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(XFS_SB_VERSION_NUMBITS | \
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XFS_SB_VERSION_ATTRBIT | \
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XFS_SB_VERSION_NLINKBIT | \
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XFS_SB_VERSION_QUOTABIT | \
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XFS_SB_VERSION_ALIGNBIT | \
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XFS_SB_VERSION_DALIGNBIT | \
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XFS_SB_VERSION_LOGV2BIT | \
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XFS_SB_VERSION_SECTORBIT | \
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XFS_SB_VERSION_EXTFLGBIT | \
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XFS_SB_VERSION_DIRV2BIT | \
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XFS_SB_VERSION_MOREBITSBIT)
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/* Recognized xfs format versions */
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#define XFS_SB_VERSION_4 4 /* Good old XFS filesystem */
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#define XFS_SB_VERSION_5 5 /* CRC enabled filesystem */
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/* features2 field flags */
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#define XFS_SB_VERSION2_LAZYSBCOUNTBIT 0x00000002 /* Superblk counters */
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#define XFS_SB_VERSION2_ATTR2BIT 0x00000008 /* Inline attr rework */
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#define XFS_SB_VERSION2_PROJID32BIT 0x00000080 /* 32-bit project ids */
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#define XFS_SB_VERSION2_FTYPE 0x00000200 /* inode type in dir */
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#define XFS_SB_VERSION2_BITS_SUPPORTED \
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(XFS_SB_VERSION2_LAZYSBCOUNTBIT | \
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XFS_SB_VERSION2_ATTR2BIT | \
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XFS_SB_VERSION2_PROJID32BIT | \
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XFS_SB_VERSION2_FTYPE)
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/* incompat feature flags */
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#define XFS_SB_FEAT_INCOMPAT_FTYPE (1 << 0) /* filetype in dirent */
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#define XFS_SB_FEAT_INCOMPAT_SPINODES (1 << 1) /* sparse inode chunks */
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#define XFS_SB_FEAT_INCOMPAT_META_UUID (1 << 2) /* metadata UUID */
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/* We do not currently verify metadata UUID so it is safe to read such filesystem */
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#define XFS_SB_FEAT_INCOMPAT_SUPPORTED \
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(XFS_SB_FEAT_INCOMPAT_FTYPE | \
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XFS_SB_FEAT_INCOMPAT_META_UUID)
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struct VasEBoot_xfs_sblock
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{
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VasEBoot_uint8_t magic[4];
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VasEBoot_uint32_t bsize;
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VasEBoot_uint8_t unused1[24];
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VasEBoot_uint16_t uuid[8];
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VasEBoot_uint8_t unused2[8];
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VasEBoot_uint64_t rootino;
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VasEBoot_uint8_t unused3[20];
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VasEBoot_uint32_t agsize;
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VasEBoot_uint8_t unused4[12];
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VasEBoot_uint16_t version;
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VasEBoot_uint8_t unused5[6];
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VasEBoot_uint8_t label[12];
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VasEBoot_uint8_t log2_bsize;
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VasEBoot_uint8_t log2_sect;
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VasEBoot_uint8_t log2_inode;
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VasEBoot_uint8_t log2_inop;
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VasEBoot_uint8_t log2_agblk;
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VasEBoot_uint8_t unused6[67];
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VasEBoot_uint8_t log2_dirblk;
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VasEBoot_uint8_t unused7[7];
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VasEBoot_uint32_t features2;
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VasEBoot_uint8_t unused8[4];
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VasEBoot_uint32_t sb_features_compat;
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VasEBoot_uint32_t sb_features_ro_compat;
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VasEBoot_uint32_t sb_features_incompat;
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VasEBoot_uint32_t sb_features_log_incompat;
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} VasEBoot_PACKED;
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struct VasEBoot_xfs_dir_header
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{
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VasEBoot_uint8_t count;
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VasEBoot_uint8_t largeino;
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union
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{
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VasEBoot_uint32_t i4;
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VasEBoot_uint64_t i8;
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} VasEBoot_PACKED parent;
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} VasEBoot_PACKED;
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/* Structure for directory entry inlined in the inode */
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struct VasEBoot_xfs_dir_entry
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{
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VasEBoot_uint8_t len;
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VasEBoot_uint16_t offset;
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char name[1];
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/* Inode number follows, 32 / 64 bits. */
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} VasEBoot_PACKED;
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/* Structure for directory entry in a block */
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struct VasEBoot_xfs_dir2_entry
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{
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VasEBoot_uint64_t inode;
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VasEBoot_uint8_t len;
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} VasEBoot_PACKED;
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struct VasEBoot_xfs_extent
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{
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/* This should be a bitfield but bietfields are unportable, so just have
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a raw array and functions extracting useful info from it.
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*/
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VasEBoot_uint32_t raw[4];
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} VasEBoot_PACKED;
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struct VasEBoot_xfs_btree_node
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{
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VasEBoot_uint8_t magic[4];
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VasEBoot_uint16_t level;
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VasEBoot_uint16_t numrecs;
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VasEBoot_uint64_t left;
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VasEBoot_uint64_t right;
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/* In V5 here follow crc, uuid, etc. */
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/* Then follow keys and block pointers */
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} VasEBoot_PACKED;
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struct VasEBoot_xfs_btree_root
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{
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VasEBoot_uint16_t level;
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VasEBoot_uint16_t numrecs;
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VasEBoot_uint64_t keys[1];
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} VasEBoot_PACKED;
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struct VasEBoot_xfs_time
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{
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VasEBoot_uint32_t sec;
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VasEBoot_uint32_t nanosec;
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} VasEBoot_PACKED;
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struct VasEBoot_xfs_inode
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{
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VasEBoot_uint8_t magic[2];
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VasEBoot_uint16_t mode;
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VasEBoot_uint8_t version;
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VasEBoot_uint8_t format;
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VasEBoot_uint8_t unused2[26];
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struct VasEBoot_xfs_time atime;
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struct VasEBoot_xfs_time mtime;
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struct VasEBoot_xfs_time ctime;
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VasEBoot_uint64_t size;
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VasEBoot_uint64_t nblocks;
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VasEBoot_uint32_t extsize;
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VasEBoot_uint32_t nextents;
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VasEBoot_uint16_t unused3;
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VasEBoot_uint8_t fork_offset;
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VasEBoot_uint8_t unused4[17];
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} VasEBoot_PACKED;
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#define XFS_V2_INODE_SIZE sizeof(struct VasEBoot_xfs_inode)
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#define XFS_V3_INODE_SIZE (XFS_V2_INODE_SIZE + 76)
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struct VasEBoot_xfs_dirblock_tail
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{
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VasEBoot_uint32_t leaf_count;
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VasEBoot_uint32_t leaf_stale;
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} VasEBoot_PACKED;
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struct VasEBoot_fshelp_node
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{
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struct VasEBoot_xfs_data *data;
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VasEBoot_uint64_t ino;
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int inode_read;
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struct VasEBoot_xfs_inode inode;
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};
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struct VasEBoot_xfs_data
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{
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struct VasEBoot_xfs_sblock sblock;
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VasEBoot_disk_t disk;
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int pos;
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int bsize;
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VasEBoot_uint32_t agsize;
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unsigned int hasftype:1;
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unsigned int hascrc:1;
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struct VasEBoot_fshelp_node diropen;
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};
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static VasEBoot_dl_t my_mod;
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static int VasEBoot_xfs_sb_hascrc(struct VasEBoot_xfs_data *data)
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{
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return (data->sblock.version & VasEBoot_cpu_to_be16_compile_time(XFS_SB_VERSION_NUMBITS)) ==
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VasEBoot_cpu_to_be16_compile_time(XFS_SB_VERSION_5);
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}
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static int VasEBoot_xfs_sb_hasftype(struct VasEBoot_xfs_data *data)
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{
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if ((data->sblock.version & VasEBoot_cpu_to_be16_compile_time(XFS_SB_VERSION_NUMBITS)) ==
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VasEBoot_cpu_to_be16_compile_time(XFS_SB_VERSION_5) &&
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data->sblock.sb_features_incompat & VasEBoot_cpu_to_be32_compile_time(XFS_SB_FEAT_INCOMPAT_FTYPE))
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return 1;
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if (data->sblock.version & VasEBoot_cpu_to_be16_compile_time(XFS_SB_VERSION_MOREBITSBIT) &&
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data->sblock.features2 & VasEBoot_cpu_to_be32_compile_time(XFS_SB_VERSION2_FTYPE))
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return 1;
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return 0;
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}
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static int VasEBoot_xfs_sb_valid(struct VasEBoot_xfs_data *data)
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{
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VasEBoot_dprintf("xfs", "Validating superblock\n");
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if (VasEBoot_strncmp ((char *) (data->sblock.magic), "XFSB", 4)
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|| data->sblock.log2_bsize < VasEBoot_DISK_SECTOR_BITS
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|| ((int) data->sblock.log2_bsize
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+ (int) data->sblock.log2_dirblk) >= 27)
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{
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VasEBoot_error (VasEBoot_ERR_BAD_FS, "not a XFS filesystem");
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return 0;
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}
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if ((data->sblock.version & VasEBoot_cpu_to_be16_compile_time(XFS_SB_VERSION_NUMBITS)) ==
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VasEBoot_cpu_to_be16_compile_time(XFS_SB_VERSION_5))
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{
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VasEBoot_dprintf("xfs", "XFS v5 superblock detected\n");
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if (data->sblock.sb_features_incompat &
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VasEBoot_cpu_to_be32_compile_time(~XFS_SB_FEAT_INCOMPAT_SUPPORTED))
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{
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VasEBoot_error (VasEBoot_ERR_BAD_FS, "XFS filesystem has unsupported "
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"incompatible features");
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return 0;
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}
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return 1;
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}
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else if ((data->sblock.version & VasEBoot_cpu_to_be16_compile_time(XFS_SB_VERSION_NUMBITS)) ==
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VasEBoot_cpu_to_be16_compile_time(XFS_SB_VERSION_4))
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{
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VasEBoot_dprintf("xfs", "XFS v4 superblock detected\n");
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if (!(data->sblock.version & VasEBoot_cpu_to_be16_compile_time(XFS_SB_VERSION_DIRV2BIT)))
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{
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VasEBoot_error (VasEBoot_ERR_BAD_FS, "XFS filesystem without V2 directories "
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"is unsupported");
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return 0;
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}
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if (data->sblock.version & VasEBoot_cpu_to_be16_compile_time(~XFS_SB_VERSION_BITS_SUPPORTED) ||
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(data->sblock.version & VasEBoot_cpu_to_be16_compile_time(XFS_SB_VERSION_MOREBITSBIT) &&
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data->sblock.features2 & VasEBoot_cpu_to_be16_compile_time(~XFS_SB_VERSION2_BITS_SUPPORTED)))
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{
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VasEBoot_error (VasEBoot_ERR_BAD_FS, "XFS filesystem has unsupported version "
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"bits");
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return 0;
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}
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return 1;
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}
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return 0;
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}
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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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static inline int
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VasEBoot_XFS_INO_AGBITS(struct VasEBoot_xfs_data *data)
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{
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return ((data)->sblock.log2_agblk + (data)->sblock.log2_inop);
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}
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static inline VasEBoot_uint64_t
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VasEBoot_XFS_INO_INOINAG (struct VasEBoot_xfs_data *data,
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VasEBoot_uint64_t ino)
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{
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return (ino & ((1LL << VasEBoot_XFS_INO_AGBITS (data)) - 1));
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}
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static inline VasEBoot_uint64_t
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VasEBoot_XFS_INO_AG (struct VasEBoot_xfs_data *data,
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VasEBoot_uint64_t ino)
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{
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return (ino >> VasEBoot_XFS_INO_AGBITS (data));
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}
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static inline VasEBoot_disk_addr_t
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VasEBoot_XFS_FSB_TO_BLOCK (struct VasEBoot_xfs_data *data, VasEBoot_disk_addr_t fsb)
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{
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return ((fsb >> data->sblock.log2_agblk) * data->agsize
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+ (fsb & ((1LL << data->sblock.log2_agblk) - 1)));
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}
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static inline VasEBoot_uint64_t
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VasEBoot_XFS_EXTENT_OFFSET (struct VasEBoot_xfs_extent *exts, int ex)
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{
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return ((VasEBoot_be_to_cpu32 (exts[ex].raw[0]) & ~(1 << 31)) << 23
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| VasEBoot_be_to_cpu32 (exts[ex].raw[1]) >> 9);
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}
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static inline VasEBoot_uint64_t
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VasEBoot_XFS_EXTENT_BLOCK (struct VasEBoot_xfs_extent *exts, int ex)
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{
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return ((VasEBoot_uint64_t) (VasEBoot_be_to_cpu32 (exts[ex].raw[1])
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& (0x1ff)) << 43
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| (VasEBoot_uint64_t) VasEBoot_be_to_cpu32 (exts[ex].raw[2]) << 11
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| VasEBoot_be_to_cpu32 (exts[ex].raw[3]) >> 21);
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}
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static inline VasEBoot_uint64_t
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VasEBoot_XFS_EXTENT_SIZE (struct VasEBoot_xfs_extent *exts, int ex)
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{
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return (VasEBoot_be_to_cpu32 (exts[ex].raw[3]) & ((1 << 21) - 1));
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}
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static inline VasEBoot_uint64_t
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VasEBoot_xfs_inode_block (struct VasEBoot_xfs_data *data,
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VasEBoot_uint64_t ino)
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{
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long long int inoinag = VasEBoot_XFS_INO_INOINAG (data, ino);
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long long ag = VasEBoot_XFS_INO_AG (data, ino);
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long long block;
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block = (inoinag >> data->sblock.log2_inop) + ag * data->agsize;
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block <<= (data->sblock.log2_bsize - VasEBoot_DISK_SECTOR_BITS);
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return block;
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}
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static inline int
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VasEBoot_xfs_inode_offset (struct VasEBoot_xfs_data *data,
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VasEBoot_uint64_t ino)
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{
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int inoag = VasEBoot_XFS_INO_INOINAG (data, ino);
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return ((inoag & ((1 << data->sblock.log2_inop) - 1)) <<
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data->sblock.log2_inode);
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}
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static inline VasEBoot_size_t
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VasEBoot_xfs_inode_size(struct VasEBoot_xfs_data *data)
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{
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return (VasEBoot_size_t)1 << data->sblock.log2_inode;
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}
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|
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/*
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* Returns size occupied by XFS inode stored in memory - we store struct
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* VasEBoot_fshelp_node there but on disk inode size may be actually larger than
|
||
* struct VasEBoot_xfs_inode so we need to account for that so that we can read
|
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* from disk directly into in-memory structure.
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*/
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static inline VasEBoot_size_t
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VasEBoot_xfs_fshelp_size(struct VasEBoot_xfs_data *data)
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{
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return sizeof (struct VasEBoot_fshelp_node) - sizeof (struct VasEBoot_xfs_inode)
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+ VasEBoot_xfs_inode_size(data);
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}
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||
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/* This should return void * but XFS code is error-prone with alignment, so
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return char to retain cast-align.
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*/
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static char *
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VasEBoot_xfs_inode_data(struct VasEBoot_xfs_inode *inode)
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{
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if (inode->version <= 2)
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return ((char *)inode) + XFS_V2_INODE_SIZE;
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return ((char *)inode) + XFS_V3_INODE_SIZE;
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}
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||
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static struct VasEBoot_xfs_dir_entry *
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VasEBoot_xfs_inline_de(struct VasEBoot_xfs_dir_header *head)
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{
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/*
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With small inode numbers the header is 4 bytes smaller because of
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smaller parent pointer
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*/
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return (struct VasEBoot_xfs_dir_entry *)
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(((char *) head) + sizeof(struct VasEBoot_xfs_dir_header) -
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(head->largeino ? 0 : sizeof(VasEBoot_uint32_t)));
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||
}
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||
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||
static VasEBoot_uint8_t *
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VasEBoot_xfs_inline_de_inopos(struct VasEBoot_xfs_data *data,
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struct VasEBoot_xfs_dir_entry *de)
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||
{
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||
return ((VasEBoot_uint8_t *)(de + 1)) + de->len - 1 + (data->hasftype ? 1 : 0);
|
||
}
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||
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||
static struct VasEBoot_xfs_dir_entry *
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VasEBoot_xfs_inline_next_de(struct VasEBoot_xfs_data *data,
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||
struct VasEBoot_xfs_dir_header *head,
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struct VasEBoot_xfs_dir_entry *de)
|
||
{
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||
char *p = (char *)de + sizeof(struct VasEBoot_xfs_dir_entry) - 1 + de->len;
|
||
|
||
p += head->largeino ? sizeof(VasEBoot_uint64_t) : sizeof(VasEBoot_uint32_t);
|
||
if (data->hasftype)
|
||
p++;
|
||
|
||
return (struct VasEBoot_xfs_dir_entry *)p;
|
||
}
|
||
|
||
static struct VasEBoot_xfs_dirblock_tail *
|
||
VasEBoot_xfs_dir_tail(struct VasEBoot_xfs_data *data, void *dirblock)
|
||
{
|
||
int dirblksize = 1 << (data->sblock.log2_bsize + data->sblock.log2_dirblk);
|
||
|
||
return (struct VasEBoot_xfs_dirblock_tail *)
|
||
((char *)dirblock + dirblksize - sizeof (struct VasEBoot_xfs_dirblock_tail));
|
||
}
|
||
|
||
static struct VasEBoot_xfs_dir2_entry *
|
||
VasEBoot_xfs_first_de(struct VasEBoot_xfs_data *data, void *dirblock)
|
||
{
|
||
if (data->hascrc)
|
||
return (struct VasEBoot_xfs_dir2_entry *)((char *)dirblock + 64);
|
||
return (struct VasEBoot_xfs_dir2_entry *)((char *)dirblock + 16);
|
||
}
|
||
|
||
static struct VasEBoot_xfs_dir2_entry *
|
||
VasEBoot_xfs_next_de(struct VasEBoot_xfs_data *data, struct VasEBoot_xfs_dir2_entry *de)
|
||
{
|
||
int size = sizeof (struct VasEBoot_xfs_dir2_entry) + de->len + 2 /* Tag */;
|
||
|
||
if (data->hasftype)
|
||
size++; /* File type */
|
||
return (struct VasEBoot_xfs_dir2_entry *)(((char *)de) + ALIGN_UP(size, 8));
|
||
}
|
||
|
||
/* This should return void * but XFS code is error-prone with alignment, so
|
||
return char to retain cast-align.
|
||
*/
|
||
static char *
|
||
VasEBoot_xfs_btree_keys(struct VasEBoot_xfs_data *data,
|
||
struct VasEBoot_xfs_btree_node *leaf)
|
||
{
|
||
char *keys = (char *)(leaf + 1);
|
||
|
||
if (data->hascrc)
|
||
keys += 48; /* skip crc, uuid, ... */
|
||
return keys;
|
||
}
|
||
|
||
static VasEBoot_err_t
|
||
VasEBoot_xfs_read_inode (struct VasEBoot_xfs_data *data, VasEBoot_uint64_t ino,
|
||
struct VasEBoot_xfs_inode *inode)
|
||
{
|
||
VasEBoot_uint64_t block = VasEBoot_xfs_inode_block (data, ino);
|
||
int offset = VasEBoot_xfs_inode_offset (data, ino);
|
||
|
||
VasEBoot_dprintf("xfs", "Reading inode (%"PRIuVasEBoot_UINT64_T") - %"PRIuVasEBoot_UINT64_T", %d\n",
|
||
ino, block, offset);
|
||
/* Read the inode. */
|
||
if (VasEBoot_disk_read (data->disk, block, offset, VasEBoot_xfs_inode_size(data),
|
||
inode))
|
||
return VasEBoot_errno;
|
||
|
||
if (VasEBoot_strncmp ((char *) inode->magic, "IN", 2))
|
||
return VasEBoot_error (VasEBoot_ERR_BAD_FS, "not a correct XFS inode");
|
||
|
||
return 0;
|
||
}
|
||
|
||
static VasEBoot_uint64_t
|
||
get_fsb (const void *keys, int idx)
|
||
{
|
||
const char *p = (const char *) keys + sizeof(VasEBoot_uint64_t) * idx;
|
||
return VasEBoot_be_to_cpu64 (VasEBoot_get_unaligned64 (p));
|
||
}
|
||
|
||
static VasEBoot_disk_addr_t
|
||
VasEBoot_xfs_read_block (VasEBoot_fshelp_node_t node, VasEBoot_disk_addr_t fileblock)
|
||
{
|
||
struct VasEBoot_xfs_btree_node *leaf = 0;
|
||
int ex, nrec;
|
||
struct VasEBoot_xfs_extent *exts;
|
||
VasEBoot_uint64_t ret = 0;
|
||
|
||
if (node->inode.format == XFS_INODE_FORMAT_BTREE)
|
||
{
|
||
struct VasEBoot_xfs_btree_root *root;
|
||
const char *keys;
|
||
int recoffset;
|
||
|
||
leaf = VasEBoot_malloc (node->data->bsize);
|
||
if (leaf == 0)
|
||
return 0;
|
||
|
||
root = (struct VasEBoot_xfs_btree_root *) VasEBoot_xfs_inode_data(&node->inode);
|
||
nrec = VasEBoot_be_to_cpu16 (root->numrecs);
|
||
keys = (char *) &root->keys[0];
|
||
if (node->inode.fork_offset)
|
||
recoffset = (node->inode.fork_offset - 1) / 2;
|
||
else
|
||
recoffset = (VasEBoot_xfs_inode_size(node->data)
|
||
- ((char *) keys - (char *) &node->inode))
|
||
/ (2 * sizeof (VasEBoot_uint64_t));
|
||
do
|
||
{
|
||
int i;
|
||
|
||
for (i = 0; i < nrec; i++)
|
||
{
|
||
if (fileblock < get_fsb(keys, i))
|
||
break;
|
||
}
|
||
|
||
/* Sparse block. */
|
||
if (i == 0)
|
||
{
|
||
VasEBoot_free (leaf);
|
||
return 0;
|
||
}
|
||
|
||
if (VasEBoot_disk_read (node->data->disk,
|
||
VasEBoot_XFS_FSB_TO_BLOCK (node->data, get_fsb (keys, i - 1 + recoffset)) << (node->data->sblock.log2_bsize - VasEBoot_DISK_SECTOR_BITS),
|
||
0, node->data->bsize, leaf))
|
||
return 0;
|
||
|
||
if ((!node->data->hascrc &&
|
||
VasEBoot_strncmp ((char *) leaf->magic, "BMAP", 4)) ||
|
||
(node->data->hascrc &&
|
||
VasEBoot_strncmp ((char *) leaf->magic, "BMA3", 4)))
|
||
{
|
||
VasEBoot_free (leaf);
|
||
VasEBoot_error (VasEBoot_ERR_BAD_FS, "not a correct XFS BMAP node");
|
||
return 0;
|
||
}
|
||
|
||
nrec = VasEBoot_be_to_cpu16 (leaf->numrecs);
|
||
keys = VasEBoot_xfs_btree_keys(node->data, leaf);
|
||
recoffset = ((node->data->bsize - ((char *) keys
|
||
- (char *) leaf))
|
||
/ (2 * sizeof (VasEBoot_uint64_t)));
|
||
}
|
||
while (leaf->level);
|
||
exts = (struct VasEBoot_xfs_extent *) keys;
|
||
}
|
||
else if (node->inode.format == XFS_INODE_FORMAT_EXT)
|
||
{
|
||
nrec = VasEBoot_be_to_cpu32 (node->inode.nextents);
|
||
exts = (struct VasEBoot_xfs_extent *) VasEBoot_xfs_inode_data(&node->inode);
|
||
}
|
||
else
|
||
{
|
||
VasEBoot_error (VasEBoot_ERR_NOT_IMPLEMENTED_YET,
|
||
"XFS does not support inode format %d yet",
|
||
node->inode.format);
|
||
return 0;
|
||
}
|
||
|
||
/* Iterate over each extent to figure out which extent has
|
||
the block we are looking for. */
|
||
for (ex = 0; ex < nrec; ex++)
|
||
{
|
||
VasEBoot_uint64_t start = VasEBoot_XFS_EXTENT_BLOCK (exts, ex);
|
||
VasEBoot_uint64_t offset = VasEBoot_XFS_EXTENT_OFFSET (exts, ex);
|
||
VasEBoot_uint64_t size = VasEBoot_XFS_EXTENT_SIZE (exts, ex);
|
||
|
||
/* Sparse block. */
|
||
if (fileblock < offset)
|
||
break;
|
||
else if (fileblock < offset + size)
|
||
{
|
||
ret = (fileblock - offset + start);
|
||
break;
|
||
}
|
||
}
|
||
|
||
VasEBoot_free (leaf);
|
||
|
||
return VasEBoot_XFS_FSB_TO_BLOCK(node->data, ret);
|
||
}
|
||
|
||
|
||
/* Read LEN bytes from the file described by DATA starting with byte
|
||
POS. Return the amount of read bytes in READ. */
|
||
static VasEBoot_ssize_t
|
||
VasEBoot_xfs_read_file (VasEBoot_fshelp_node_t node,
|
||
VasEBoot_disk_read_hook_t read_hook, void *read_hook_data,
|
||
VasEBoot_off_t pos, VasEBoot_size_t len, char *buf, VasEBoot_uint32_t header_size)
|
||
{
|
||
return VasEBoot_fshelp_read_file (node->data->disk, node,
|
||
read_hook, read_hook_data,
|
||
pos, len, buf, VasEBoot_xfs_read_block,
|
||
VasEBoot_be_to_cpu64 (node->inode.size) + header_size,
|
||
node->data->sblock.log2_bsize
|
||
- VasEBoot_DISK_SECTOR_BITS, 0);
|
||
}
|
||
|
||
|
||
static char *
|
||
VasEBoot_xfs_read_symlink (VasEBoot_fshelp_node_t node)
|
||
{
|
||
VasEBoot_ssize_t size = VasEBoot_be_to_cpu64 (node->inode.size);
|
||
|
||
if (size < 0)
|
||
{
|
||
VasEBoot_error (VasEBoot_ERR_BAD_FS, "invalid symlink");
|
||
return 0;
|
||
}
|
||
|
||
switch (node->inode.format)
|
||
{
|
||
case XFS_INODE_FORMAT_INO:
|
||
return VasEBoot_strndup (VasEBoot_xfs_inode_data(&node->inode), size);
|
||
|
||
case XFS_INODE_FORMAT_EXT:
|
||
{
|
||
char *symlink;
|
||
VasEBoot_ssize_t numread;
|
||
int off = 0;
|
||
|
||
if (node->data->hascrc)
|
||
off = 56;
|
||
|
||
symlink = VasEBoot_malloc (size + 1);
|
||
if (!symlink)
|
||
return 0;
|
||
|
||
node->inode.size = VasEBoot_be_to_cpu64 (size + off);
|
||
numread = VasEBoot_xfs_read_file (node, 0, 0, off, size, symlink, off);
|
||
if (numread != size)
|
||
{
|
||
VasEBoot_free (symlink);
|
||
return 0;
|
||
}
|
||
symlink[size] = '\0';
|
||
return symlink;
|
||
}
|
||
}
|
||
|
||
return 0;
|
||
}
|
||
|
||
|
||
static enum VasEBoot_fshelp_filetype
|
||
VasEBoot_xfs_mode_to_filetype (VasEBoot_uint16_t mode)
|
||
{
|
||
if ((VasEBoot_be_to_cpu16 (mode)
|
||
& FILETYPE_INO_MASK) == FILETYPE_INO_DIRECTORY)
|
||
return VasEBoot_FSHELP_DIR;
|
||
else if ((VasEBoot_be_to_cpu16 (mode)
|
||
& FILETYPE_INO_MASK) == FILETYPE_INO_SYMLINK)
|
||
return VasEBoot_FSHELP_SYMLINK;
|
||
else if ((VasEBoot_be_to_cpu16 (mode)
|
||
& FILETYPE_INO_MASK) == FILETYPE_INO_REG)
|
||
return VasEBoot_FSHELP_REG;
|
||
return VasEBoot_FSHELP_UNKNOWN;
|
||
}
|
||
|
||
|
||
/* Context for VasEBoot_xfs_iterate_dir. */
|
||
struct VasEBoot_xfs_iterate_dir_ctx
|
||
{
|
||
VasEBoot_fshelp_iterate_dir_hook_t hook;
|
||
void *hook_data;
|
||
struct VasEBoot_fshelp_node *diro;
|
||
};
|
||
|
||
/* Helper for VasEBoot_xfs_iterate_dir. */
|
||
static int iterate_dir_call_hook (VasEBoot_uint64_t ino, const char *filename,
|
||
struct VasEBoot_xfs_iterate_dir_ctx *ctx)
|
||
{
|
||
struct VasEBoot_fshelp_node *fdiro;
|
||
VasEBoot_err_t err;
|
||
|
||
fdiro = VasEBoot_malloc (VasEBoot_xfs_fshelp_size(ctx->diro->data) + 1);
|
||
if (!fdiro)
|
||
{
|
||
VasEBoot_print_error ();
|
||
return 0;
|
||
}
|
||
|
||
/* The inode should be read, otherwise the filetype can
|
||
not be determined. */
|
||
fdiro->ino = ino;
|
||
fdiro->inode_read = 1;
|
||
fdiro->data = ctx->diro->data;
|
||
err = VasEBoot_xfs_read_inode (ctx->diro->data, ino, &fdiro->inode);
|
||
if (err)
|
||
{
|
||
VasEBoot_print_error ();
|
||
return 0;
|
||
}
|
||
|
||
return ctx->hook (filename, VasEBoot_xfs_mode_to_filetype (fdiro->inode.mode),
|
||
fdiro, ctx->hook_data);
|
||
}
|
||
|
||
static int
|
||
VasEBoot_xfs_iterate_dir (VasEBoot_fshelp_node_t dir,
|
||
VasEBoot_fshelp_iterate_dir_hook_t hook, void *hook_data)
|
||
{
|
||
struct VasEBoot_fshelp_node *diro = (struct VasEBoot_fshelp_node *) dir;
|
||
struct VasEBoot_xfs_iterate_dir_ctx ctx = {
|
||
.hook = hook,
|
||
.hook_data = hook_data,
|
||
.diro = diro
|
||
};
|
||
|
||
switch (diro->inode.format)
|
||
{
|
||
case XFS_INODE_FORMAT_INO:
|
||
{
|
||
struct VasEBoot_xfs_dir_header *head = (struct VasEBoot_xfs_dir_header *) VasEBoot_xfs_inode_data(&diro->inode);
|
||
struct VasEBoot_xfs_dir_entry *de = VasEBoot_xfs_inline_de(head);
|
||
int smallino = !head->largeino;
|
||
int i;
|
||
VasEBoot_uint64_t parent;
|
||
|
||
/* If small inode numbers are used to pack the direntry, the
|
||
parent inode number is small too. */
|
||
if (smallino)
|
||
parent = VasEBoot_be_to_cpu32 (head->parent.i4);
|
||
else
|
||
parent = VasEBoot_be_to_cpu64 (head->parent.i8);
|
||
|
||
/* Synthesize the direntries for `.' and `..'. */
|
||
if (iterate_dir_call_hook (diro->ino, ".", &ctx))
|
||
return 1;
|
||
|
||
if (iterate_dir_call_hook (parent, "..", &ctx))
|
||
return 1;
|
||
|
||
for (i = 0; i < head->count; i++)
|
||
{
|
||
VasEBoot_uint64_t ino;
|
||
VasEBoot_uint8_t *inopos = VasEBoot_xfs_inline_de_inopos(dir->data, de);
|
||
VasEBoot_uint8_t c;
|
||
|
||
/* inopos might be unaligned. */
|
||
if (smallino)
|
||
ino = (((VasEBoot_uint32_t) inopos[0]) << 24)
|
||
| (((VasEBoot_uint32_t) inopos[1]) << 16)
|
||
| (((VasEBoot_uint32_t) inopos[2]) << 8)
|
||
| (((VasEBoot_uint32_t) inopos[3]) << 0);
|
||
else
|
||
ino = (((VasEBoot_uint64_t) inopos[0]) << 56)
|
||
| (((VasEBoot_uint64_t) inopos[1]) << 48)
|
||
| (((VasEBoot_uint64_t) inopos[2]) << 40)
|
||
| (((VasEBoot_uint64_t) inopos[3]) << 32)
|
||
| (((VasEBoot_uint64_t) inopos[4]) << 24)
|
||
| (((VasEBoot_uint64_t) inopos[5]) << 16)
|
||
| (((VasEBoot_uint64_t) inopos[6]) << 8)
|
||
| (((VasEBoot_uint64_t) inopos[7]) << 0);
|
||
|
||
c = de->name[de->len];
|
||
de->name[de->len] = '\0';
|
||
if (iterate_dir_call_hook (ino, de->name, &ctx))
|
||
{
|
||
de->name[de->len] = c;
|
||
return 1;
|
||
}
|
||
de->name[de->len] = c;
|
||
|
||
de = VasEBoot_xfs_inline_next_de(dir->data, head, de);
|
||
}
|
||
break;
|
||
}
|
||
|
||
case XFS_INODE_FORMAT_BTREE:
|
||
case XFS_INODE_FORMAT_EXT:
|
||
{
|
||
VasEBoot_ssize_t numread;
|
||
char *dirblock;
|
||
VasEBoot_uint64_t blk;
|
||
int dirblk_size, dirblk_log2;
|
||
|
||
dirblk_log2 = (dir->data->sblock.log2_bsize
|
||
+ dir->data->sblock.log2_dirblk);
|
||
dirblk_size = 1 << dirblk_log2;
|
||
|
||
dirblock = VasEBoot_malloc (dirblk_size);
|
||
if (! dirblock)
|
||
return 0;
|
||
|
||
/* Iterate over every block the directory has. */
|
||
for (blk = 0;
|
||
blk < (VasEBoot_be_to_cpu64 (dir->inode.size)
|
||
>> dirblk_log2);
|
||
blk++)
|
||
{
|
||
struct VasEBoot_xfs_dir2_entry *direntry =
|
||
VasEBoot_xfs_first_de(dir->data, dirblock);
|
||
int entries;
|
||
struct VasEBoot_xfs_dirblock_tail *tail =
|
||
VasEBoot_xfs_dir_tail(dir->data, dirblock);
|
||
|
||
numread = VasEBoot_xfs_read_file (dir, 0, 0,
|
||
blk << dirblk_log2,
|
||
dirblk_size, dirblock, 0);
|
||
if (numread != dirblk_size)
|
||
return 0;
|
||
|
||
entries = (VasEBoot_be_to_cpu32 (tail->leaf_count)
|
||
- VasEBoot_be_to_cpu32 (tail->leaf_stale));
|
||
|
||
/* Iterate over all entries within this block. */
|
||
while ((char *)direntry < (char *)tail)
|
||
{
|
||
VasEBoot_uint8_t *freetag;
|
||
char *filename;
|
||
|
||
freetag = (VasEBoot_uint8_t *) direntry;
|
||
|
||
if (VasEBoot_get_unaligned16 (freetag) == 0XFFFF)
|
||
{
|
||
VasEBoot_uint8_t *skip = (freetag + sizeof (VasEBoot_uint16_t));
|
||
|
||
/* This entry is not used, go to the next one. */
|
||
direntry = (struct VasEBoot_xfs_dir2_entry *)
|
||
(((char *)direntry) +
|
||
VasEBoot_be_to_cpu16 (VasEBoot_get_unaligned16 (skip)));
|
||
|
||
continue;
|
||
}
|
||
|
||
filename = (char *)(direntry + 1);
|
||
/* The byte after the filename is for the filetype, padding, or
|
||
tag, which is not used by VasEBoot. So it can be overwritten. */
|
||
filename[direntry->len] = '\0';
|
||
|
||
if (iterate_dir_call_hook (VasEBoot_be_to_cpu64(direntry->inode),
|
||
filename, &ctx))
|
||
{
|
||
VasEBoot_free (dirblock);
|
||
return 1;
|
||
}
|
||
|
||
/* Check if last direntry in this block is
|
||
reached. */
|
||
entries--;
|
||
if (!entries)
|
||
break;
|
||
|
||
/* Select the next directory entry. */
|
||
direntry = VasEBoot_xfs_next_de(dir->data, direntry);
|
||
}
|
||
}
|
||
VasEBoot_free (dirblock);
|
||
break;
|
||
}
|
||
|
||
default:
|
||
VasEBoot_error (VasEBoot_ERR_NOT_IMPLEMENTED_YET,
|
||
"XFS does not support inode format %d yet",
|
||
diro->inode.format);
|
||
}
|
||
return 0;
|
||
}
|
||
|
||
|
||
static struct VasEBoot_xfs_data *
|
||
VasEBoot_xfs_mount (VasEBoot_disk_t disk)
|
||
{
|
||
struct VasEBoot_xfs_data *data = 0;
|
||
|
||
data = VasEBoot_zalloc (sizeof (struct VasEBoot_xfs_data));
|
||
if (!data)
|
||
return 0;
|
||
|
||
VasEBoot_dprintf("xfs", "Reading sb\n");
|
||
/* Read the superblock. */
|
||
if (VasEBoot_disk_read (disk, 0, 0,
|
||
sizeof (struct VasEBoot_xfs_sblock), &data->sblock))
|
||
goto fail;
|
||
|
||
if (!VasEBoot_xfs_sb_valid(data))
|
||
goto fail;
|
||
|
||
data = VasEBoot_realloc (data,
|
||
sizeof (struct VasEBoot_xfs_data)
|
||
- sizeof (struct VasEBoot_xfs_inode)
|
||
+ VasEBoot_xfs_inode_size(data) + 1);
|
||
|
||
if (! data)
|
||
goto fail;
|
||
|
||
data->diropen.data = data;
|
||
data->diropen.ino = VasEBoot_be_to_cpu64(data->sblock.rootino);
|
||
data->diropen.inode_read = 1;
|
||
data->bsize = VasEBoot_be_to_cpu32 (data->sblock.bsize);
|
||
data->agsize = VasEBoot_be_to_cpu32 (data->sblock.agsize);
|
||
data->hasftype = VasEBoot_xfs_sb_hasftype(data);
|
||
data->hascrc = VasEBoot_xfs_sb_hascrc(data);
|
||
|
||
data->disk = disk;
|
||
data->pos = 0;
|
||
VasEBoot_dprintf("xfs", "Reading root ino %"PRIuVasEBoot_UINT64_T"\n",
|
||
VasEBoot_cpu_to_be64(data->sblock.rootino));
|
||
|
||
VasEBoot_xfs_read_inode (data, data->diropen.ino, &data->diropen.inode);
|
||
|
||
return data;
|
||
fail:
|
||
|
||
if (VasEBoot_errno == VasEBoot_ERR_OUT_OF_RANGE)
|
||
VasEBoot_error (VasEBoot_ERR_BAD_FS, "not an XFS filesystem");
|
||
|
||
VasEBoot_free (data);
|
||
|
||
return 0;
|
||
}
|
||
|
||
|
||
/* Context for VasEBoot_xfs_dir. */
|
||
struct VasEBoot_xfs_dir_ctx
|
||
{
|
||
VasEBoot_fs_dir_hook_t hook;
|
||
void *hook_data;
|
||
};
|
||
|
||
/* Helper for VasEBoot_xfs_dir. */
|
||
static int
|
||
VasEBoot_xfs_dir_iter (const char *filename, enum VasEBoot_fshelp_filetype filetype,
|
||
VasEBoot_fshelp_node_t node, void *data)
|
||
{
|
||
struct VasEBoot_xfs_dir_ctx *ctx = data;
|
||
struct VasEBoot_dirhook_info info;
|
||
|
||
VasEBoot_memset (&info, 0, sizeof (info));
|
||
if (node->inode_read)
|
||
{
|
||
info.mtimeset = 1;
|
||
info.mtime = VasEBoot_be_to_cpu32 (node->inode.mtime.sec);
|
||
}
|
||
info.dir = ((filetype & VasEBoot_FSHELP_TYPE_MASK) == VasEBoot_FSHELP_DIR);
|
||
VasEBoot_free (node);
|
||
return ctx->hook (filename, &info, ctx->hook_data);
|
||
}
|
||
|
||
static VasEBoot_err_t
|
||
VasEBoot_xfs_dir (VasEBoot_device_t device, const char *path,
|
||
VasEBoot_fs_dir_hook_t hook, void *hook_data)
|
||
{
|
||
struct VasEBoot_xfs_dir_ctx ctx = { hook, hook_data };
|
||
struct VasEBoot_xfs_data *data = 0;
|
||
struct VasEBoot_fshelp_node *fdiro = 0;
|
||
|
||
VasEBoot_dl_ref (my_mod);
|
||
|
||
data = VasEBoot_xfs_mount (device->disk);
|
||
if (!data)
|
||
goto mount_fail;
|
||
|
||
VasEBoot_fshelp_find_file (path, &data->diropen, &fdiro, VasEBoot_xfs_iterate_dir,
|
||
VasEBoot_xfs_read_symlink, VasEBoot_FSHELP_DIR);
|
||
if (VasEBoot_errno)
|
||
goto fail;
|
||
|
||
VasEBoot_xfs_iterate_dir (fdiro, VasEBoot_xfs_dir_iter, &ctx);
|
||
|
||
fail:
|
||
if (fdiro != &data->diropen)
|
||
VasEBoot_free (fdiro);
|
||
VasEBoot_free (data);
|
||
|
||
mount_fail:
|
||
|
||
VasEBoot_dl_unref (my_mod);
|
||
|
||
return VasEBoot_errno;
|
||
}
|
||
|
||
|
||
/* Open a file named NAME and initialize FILE. */
|
||
static VasEBoot_err_t
|
||
VasEBoot_xfs_open (struct VasEBoot_file *file, const char *name)
|
||
{
|
||
struct VasEBoot_xfs_data *data;
|
||
struct VasEBoot_fshelp_node *fdiro = 0;
|
||
|
||
VasEBoot_dl_ref (my_mod);
|
||
|
||
data = VasEBoot_xfs_mount (file->device->disk);
|
||
if (!data)
|
||
goto mount_fail;
|
||
|
||
VasEBoot_fshelp_find_file (name, &data->diropen, &fdiro, VasEBoot_xfs_iterate_dir,
|
||
VasEBoot_xfs_read_symlink, VasEBoot_FSHELP_REG);
|
||
if (VasEBoot_errno)
|
||
goto fail;
|
||
|
||
if (!fdiro->inode_read)
|
||
{
|
||
VasEBoot_xfs_read_inode (data, fdiro->ino, &fdiro->inode);
|
||
if (VasEBoot_errno)
|
||
goto fail;
|
||
}
|
||
|
||
if (fdiro != &data->diropen)
|
||
{
|
||
VasEBoot_memcpy (&data->diropen, fdiro, VasEBoot_xfs_fshelp_size(data));
|
||
VasEBoot_free (fdiro);
|
||
}
|
||
|
||
file->size = VasEBoot_be_to_cpu64 (data->diropen.inode.size);
|
||
file->data = data;
|
||
file->offset = 0;
|
||
|
||
return 0;
|
||
|
||
fail:
|
||
if (fdiro != &data->diropen)
|
||
VasEBoot_free (fdiro);
|
||
VasEBoot_free (data);
|
||
|
||
mount_fail:
|
||
VasEBoot_dl_unref (my_mod);
|
||
|
||
return VasEBoot_errno;
|
||
}
|
||
|
||
|
||
static VasEBoot_ssize_t
|
||
VasEBoot_xfs_read (VasEBoot_file_t file, char *buf, VasEBoot_size_t len)
|
||
{
|
||
struct VasEBoot_xfs_data *data =
|
||
(struct VasEBoot_xfs_data *) file->data;
|
||
|
||
return VasEBoot_xfs_read_file (&data->diropen,
|
||
file->read_hook, file->read_hook_data,
|
||
file->offset, len, buf, 0);
|
||
}
|
||
|
||
|
||
static VasEBoot_err_t
|
||
VasEBoot_xfs_close (VasEBoot_file_t file)
|
||
{
|
||
VasEBoot_free (file->data);
|
||
|
||
VasEBoot_dl_unref (my_mod);
|
||
|
||
return VasEBoot_ERR_NONE;
|
||
}
|
||
|
||
|
||
static VasEBoot_err_t
|
||
VasEBoot_xfs_label (VasEBoot_device_t device, char **label)
|
||
{
|
||
struct VasEBoot_xfs_data *data;
|
||
VasEBoot_disk_t disk = device->disk;
|
||
|
||
VasEBoot_dl_ref (my_mod);
|
||
|
||
data = VasEBoot_xfs_mount (disk);
|
||
if (data)
|
||
*label = VasEBoot_strndup ((char *) (data->sblock.label), 12);
|
||
else
|
||
*label = 0;
|
||
|
||
VasEBoot_dl_unref (my_mod);
|
||
|
||
VasEBoot_free (data);
|
||
|
||
return VasEBoot_errno;
|
||
}
|
||
|
||
static VasEBoot_err_t
|
||
VasEBoot_xfs_uuid (VasEBoot_device_t device, char **uuid)
|
||
{
|
||
struct VasEBoot_xfs_data *data;
|
||
VasEBoot_disk_t disk = device->disk;
|
||
|
||
VasEBoot_dl_ref (my_mod);
|
||
|
||
data = VasEBoot_xfs_mount (disk);
|
||
if (data)
|
||
{
|
||
*uuid = VasEBoot_xasprintf ("%04x%04x-%04x-%04x-%04x-%04x%04x%04x",
|
||
VasEBoot_be_to_cpu16 (data->sblock.uuid[0]),
|
||
VasEBoot_be_to_cpu16 (data->sblock.uuid[1]),
|
||
VasEBoot_be_to_cpu16 (data->sblock.uuid[2]),
|
||
VasEBoot_be_to_cpu16 (data->sblock.uuid[3]),
|
||
VasEBoot_be_to_cpu16 (data->sblock.uuid[4]),
|
||
VasEBoot_be_to_cpu16 (data->sblock.uuid[5]),
|
||
VasEBoot_be_to_cpu16 (data->sblock.uuid[6]),
|
||
VasEBoot_be_to_cpu16 (data->sblock.uuid[7]));
|
||
}
|
||
else
|
||
*uuid = NULL;
|
||
|
||
VasEBoot_dl_unref (my_mod);
|
||
|
||
VasEBoot_free (data);
|
||
|
||
return VasEBoot_errno;
|
||
}
|
||
|
||
|
||
|
||
static struct VasEBoot_fs VasEBoot_xfs_fs =
|
||
{
|
||
.name = "xfs",
|
||
.dir = VasEBoot_xfs_dir,
|
||
.open = VasEBoot_xfs_open,
|
||
.read = VasEBoot_xfs_read,
|
||
.close = VasEBoot_xfs_close,
|
||
.label = VasEBoot_xfs_label,
|
||
.uuid = VasEBoot_xfs_uuid,
|
||
#ifdef VasEBoot_UTIL
|
||
.reserved_first_sector = 0,
|
||
.blocklist_install = 1,
|
||
#endif
|
||
.next = 0
|
||
};
|
||
|
||
VasEBoot_MOD_INIT(xfs)
|
||
{
|
||
VasEBoot_fs_register (&VasEBoot_xfs_fs);
|
||
my_mod = mod;
|
||
}
|
||
|
||
VasEBoot_MOD_FINI(xfs)
|
||
{
|
||
VasEBoot_fs_unregister (&VasEBoot_xfs_fs);
|
||
}
|