707 lines
16 KiB
C
707 lines
16 KiB
C
/* xfs.c - XFS. */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2005 Free Software Foundation, Inc.
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*
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* This program 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 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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 this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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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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#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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struct grub_xfs_sblock
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{
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grub_uint8_t magic[4];
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grub_uint32_t bsize;
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grub_uint8_t unused1[48];
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grub_uint64_t rootino;
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grub_uint8_t unused2[20];
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grub_uint32_t agsize;
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grub_uint8_t unused3[20];
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grub_uint8_t label[12];
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grub_uint8_t log2_bsize;
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grub_uint8_t unused4[2];
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grub_uint8_t log2_inop;
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grub_uint8_t log2_agblk;
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} __attribute__ ((packed));
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struct grub_xfs_dir_header
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{
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grub_uint8_t entries;
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grub_uint8_t smallino;
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grub_uint32_t parent;
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} __attribute__ ((packed));
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struct grub_xfs_dir_entry
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{
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grub_uint8_t len;
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grub_uint16_t offset;
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char name[1];
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/* Inode number follows, 32 bits. */
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} __attribute__ ((packed));
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struct grub_xfs_dir2_entry
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{
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grub_uint64_t inode;
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grub_uint8_t len;
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} __attribute__ ((packed));
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typedef grub_uint32_t grub_xfs_extent[4];
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struct grub_xfs_inode
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{
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grub_uint8_t magic[2];
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grub_uint16_t mode;
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grub_uint8_t version;
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grub_uint8_t format;
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grub_uint8_t unused2[50];
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grub_uint64_t size;
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grub_uint8_t unused3[36];
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union
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{
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char raw[156];
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struct dir
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{
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struct grub_xfs_dir_header dirhead;
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struct grub_xfs_dir_entry direntry[1];
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} dir;
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grub_xfs_extent extents[XFS_INODE_EXTENTS];
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} data __attribute__ ((packed));
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} __attribute__ ((packed));
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struct grub_xfs_dirblock_tail
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{
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grub_uint32_t leaf_count;
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grub_uint32_t leaf_stale;
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} __attribute__ ((packed));
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struct grub_fshelp_node
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{
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struct grub_xfs_data *data;
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struct grub_xfs_inode inode;
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grub_uint64_t ino;
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int inode_read;
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};
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struct grub_xfs_data
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{
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struct grub_xfs_sblock sblock;
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struct grub_xfs_inode *inode;
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grub_disk_t disk;
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int pos;
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int bsize;
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int agsize;
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struct grub_fshelp_node diropen;
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};
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#ifndef GRUB_UTIL
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static grub_dl_t my_mod;
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#endif
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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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#define GRUB_XFS_INO_AGBITS(data) \
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((data)->sblock.log2_agblk + (data)->sblock.log2_inop)
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#define GRUB_XFS_INO_INOINAG(data, ino) \
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(grub_be_to_cpu64 (ino) & ((1 << GRUB_XFS_INO_AGBITS (data)) - 1))
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#define GRUB_XFS_INO_AG(data,ino) \
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(grub_be_to_cpu64 (ino) >> GRUB_XFS_INO_AGBITS (data))
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#define GRUB_XFS_EXTENT_OFFSET(inode,ex) \
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((grub_be_to_cpu32 ((inode)->data.extents[ex][0]) & ~(1 << 31)) << 23 \
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| grub_be_to_cpu32 ((inode)->data.extents[ex][1]) >> 9)
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#define GRUB_XFS_EXTENT_BLOCK(inode,ex) \
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((grub_uint64_t) (grub_be_to_cpu32 ((inode)->data.extents[ex][1]) \
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& (~255)) << 43 \
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| (grub_uint64_t) grub_be_to_cpu32 ((inode)->data.extents[ex][2]) << 11 \
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| grub_be_to_cpu32 ((inode)->data.extents[ex][3]) >> 21)
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#define GRUB_XFS_EXTENT_SIZE(inode,ex) \
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(grub_be_to_cpu32 ((inode)->data.extents[ex][3]) & ((1 << 20) - 1))
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#define GRUB_XFS_ROUND_TO_DIRENT(pos) ((((pos) + 8 - 1) / 8) * 8)
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#define GRUB_XFS_NEXT_DIRENT(pos,len) \
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(pos) + GRUB_XFS_ROUND_TO_DIRENT (8 + 1 + len + 2)
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static inline int grub_xfs_inode_block (struct grub_xfs_data *data,
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grub_uint64_t ino)
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{
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long long int inoinag = GRUB_XFS_INO_INOINAG (data, ino);
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long long ag = GRUB_XFS_INO_AG (data, ino);
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long long block;
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block = (inoinag >> 4) + ag * data->agsize;
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block <<= (data->sblock.log2_bsize - GRUB_DISK_SECTOR_BITS);
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return block;
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}
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static inline int grub_xfs_inode_offset (struct grub_xfs_data *data,
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grub_uint64_t ino)
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{
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int inoag = GRUB_XFS_INO_INOINAG (data, ino);
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return (inoag & ((1 << 4) - 1)) << 8;
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}
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static grub_err_t
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grub_xfs_read_inode (struct grub_xfs_data *data, grub_uint64_t ino,
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struct grub_xfs_inode *inode)
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{
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int block = grub_xfs_inode_block (data, ino);
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int offset = grub_xfs_inode_offset (data, ino);
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/* Read the inode. */
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if (grub_disk_read (data->disk, block, offset,
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sizeof (struct grub_xfs_inode), (char *) inode))
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return grub_errno;
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if (grub_strncmp (inode->magic, "IN", 2))
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return grub_error (GRUB_ERR_BAD_FS, "not a correct XFS inode.\n");
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return 0;
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}
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static int
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grub_xfs_read_block (grub_fshelp_node_t node, int fileblock)
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{
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int ex;
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if (node->inode.format != XFS_INODE_FORMAT_EXT)
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{
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grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET,
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"xfs does not support inode format %d yet",
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node->inode.format);
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return 0;
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}
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/* Iterate over each extent to figure out which extent has
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the block we are looking for. */
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for (ex = 0; ex < XFS_INODE_EXTENTS; ex++)
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{
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grub_uint64_t start = GRUB_XFS_EXTENT_BLOCK (&node->inode, ex);
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int offset = GRUB_XFS_EXTENT_OFFSET (&node->inode, ex);
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int size = GRUB_XFS_EXTENT_SIZE (&node->inode, ex);
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unsigned int ag = start >> node->data->sblock.log2_agblk;
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unsigned int block = start & ((1 << node->data->sblock.log2_agblk) - 1);
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if (fileblock < offset + size)
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return (fileblock - offset + block) + ag * node->data->agsize;
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}
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grub_error (GRUB_ERR_FILE_READ_ERROR,
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"xfs block %d for inode %d is not in an extent.\n",
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fileblock, grub_be_to_cpu64 (node->ino));
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return 0;
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}
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/* Read LEN bytes from the file described by DATA starting with byte
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POS. Return the amount of read bytes in READ. */
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static grub_ssize_t
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grub_xfs_read_file (grub_fshelp_node_t node,
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void (*read_hook) (unsigned long sector,
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unsigned offset, unsigned length),
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int pos, unsigned int len, char *buf)
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{
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return grub_fshelp_read_file (node->data->disk, node, read_hook,
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pos, len, buf, grub_xfs_read_block,
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grub_be_to_cpu64 (node->inode.size),
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node->data->sblock.log2_bsize
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- GRUB_DISK_SECTOR_BITS);
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}
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static char *
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grub_xfs_read_symlink (grub_fshelp_node_t node)
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{
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int size = grub_be_to_cpu64 (node->inode.size);
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switch (node->inode.format)
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{
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case XFS_INODE_FORMAT_INO:
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return grub_strndup (node->inode.data.raw, size);
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case XFS_INODE_FORMAT_EXT:
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{
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char *symlink;
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grub_ssize_t numread;
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symlink = grub_malloc (size + 1);
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if (!symlink)
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return 0;
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numread = grub_xfs_read_file (node, 0, 0, size, symlink);
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if (numread != size)
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{
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grub_free (symlink);
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return 0;
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}
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symlink[size] = '\0';
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return symlink;
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}
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}
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return 0;
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}
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static enum grub_fshelp_filetype
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grub_xfs_mode_to_filetype (grub_uint16_t mode)
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{
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if ((grub_be_to_cpu16 (mode)
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& FILETYPE_INO_MASK) == FILETYPE_INO_DIRECTORY)
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return GRUB_FSHELP_DIR;
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else if ((grub_be_to_cpu16 (mode)
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& FILETYPE_INO_MASK) == FILETYPE_INO_SYMLINK)
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return GRUB_FSHELP_SYMLINK;
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else if ((grub_be_to_cpu16 (mode)
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& FILETYPE_INO_MASK) == FILETYPE_INO_REG)
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return GRUB_FSHELP_REG;
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return GRUB_FSHELP_UNKNOWN;
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}
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static int
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grub_xfs_iterate_dir (grub_fshelp_node_t dir,
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int NESTED_FUNC_ATTR
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(*hook) (const char *filename,
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enum grub_fshelp_filetype filetype,
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grub_fshelp_node_t node))
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{
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struct grub_fshelp_node *diro = (struct grub_fshelp_node *) dir;
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auto int call_hook (grub_uint64_t ino, char *filename);
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int call_hook (grub_uint64_t ino, char *filename)
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{
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struct grub_fshelp_node *fdiro;
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fdiro = grub_malloc (sizeof (struct grub_fshelp_node));
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if (!fdiro)
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return 0;
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/* The inode should be read, otherwise the filetype can
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not be determined. */
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fdiro->ino = ino;
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fdiro->inode_read = 1;
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fdiro->data = diro->data;
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grub_xfs_read_inode (diro->data, ino, &fdiro->inode);
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return hook (filename,
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grub_xfs_mode_to_filetype (fdiro->inode.mode),
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fdiro);
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}
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switch (diro->inode.format)
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{
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case XFS_INODE_FORMAT_INO:
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{
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struct grub_xfs_dir_entry *de = &diro->inode.data.dir.direntry[0];
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int smallino = !diro->inode.data.dir.dirhead.smallino;
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int i;
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grub_uint64_t parent;
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/* If small inode numbers are used to pack the direntry, the
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parent inode number is small too. */
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if (smallino)
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{
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parent = grub_be_to_cpu32 (diro->inode.data.dir.dirhead.parent);
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parent = grub_cpu_to_be64 (parent);
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}
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else
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{
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parent = *(grub_uint64_t *) &diro->inode.data.dir.dirhead.parent;
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/* The header is a bit bigger than usual. */
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de = (struct grub_xfs_dir_entry *) ((char *) de + 4);
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}
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/* Synthesize the direntries for `.' and `..'. */
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if (call_hook (diro->ino, "."))
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return 1;
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if (call_hook (parent, ".."))
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return 1;
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for (i = 0; i < diro->inode.data.dir.dirhead.entries; i++)
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{
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grub_uint64_t ino;
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void *inopos = (((char *) de)
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+ sizeof (struct grub_xfs_dir_entry) + de->len - 1);
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if (smallino)
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{
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ino = grub_be_to_cpu32 (*(grub_uint32_t *) inopos);
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ino = grub_cpu_to_be64 (ino);
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}
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else
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ino = *(grub_uint64_t *) inopos;
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if (call_hook (ino, de->name))
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return 1;
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de = ((struct grub_xfs_dir_entry *)
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(((char *) de)+ sizeof (struct grub_xfs_dir_entry) + de->len
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+ ((smallino ? sizeof (grub_uint32_t)
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: sizeof (grub_uint64_t))) - 1));
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}
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break;
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}
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case XFS_INODE_FORMAT_BTREE:
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case XFS_INODE_FORMAT_EXT:
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{
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grub_ssize_t numread;
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char *dirblock;
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unsigned int blk;
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dirblock = grub_malloc (dir->data->bsize);
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if (!dirblock)
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return 0;
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/* Iterate over every block the directory has. */
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for (blk = 0;
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blk < (grub_be_to_cpu64 (dir->inode.size)
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>> dir->data->sblock.log2_bsize);
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blk++)
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{
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/* The header is skipped, the first direntry is stored
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from byte 16. */
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int pos = 16;
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int entries;
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int tail_start = (dir->data->bsize
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- sizeof (struct grub_xfs_dirblock_tail));
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struct grub_xfs_dirblock_tail *tail;
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tail = (struct grub_xfs_dirblock_tail *) &dirblock[tail_start];
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numread = grub_xfs_read_file (dir, 0,
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blk << dir->data->sblock.log2_bsize,
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dir->data->bsize, dirblock);
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entries = (grub_be_to_cpu32 (tail->leaf_count)
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- grub_be_to_cpu32 (tail->leaf_stale));
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/* Iterate over all entries within this block. */
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while (pos < (dir->data->bsize
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- (int) sizeof (struct grub_xfs_dir2_entry)))
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{
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struct grub_xfs_dir2_entry *direntry;
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grub_uint16_t *freetag;
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char *filename;
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direntry = (struct grub_xfs_dir2_entry *) &dirblock[pos];
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freetag = (grub_uint16_t *) direntry;
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if (*freetag == 0XFFFF)
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{
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grub_uint16_t *skip = (grub_uint16_t *) (freetag + 1);
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/* This entry is not used, go to the next one. */
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pos += grub_be_to_cpu16 (*skip);
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continue;
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}
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filename = &dirblock[pos + sizeof (*direntry)];
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/* The byte after the filename is for the tag, which
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is not used by GRUB. So it can be overwritten. */
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filename[direntry->len] = '\0';
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if (call_hook (direntry->inode, filename))
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{
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grub_free (dirblock);
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return 1;
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}
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/* Check if last direntry in this block is
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reached. */
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entries--;
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if (!entries)
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break;
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/* Select the next directory entry. */
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pos = GRUB_XFS_NEXT_DIRENT (pos, direntry->len);
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pos = GRUB_XFS_ROUND_TO_DIRENT (pos);
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}
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}
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grub_free (dirblock);
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break;
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}
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default:
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grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET,
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"xfs does not support inode format %d yet",
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diro->inode.format);
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}
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return 0;
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}
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static struct grub_xfs_data *
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grub_xfs_mount (grub_disk_t disk)
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{
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struct grub_xfs_data *data = 0;
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data = grub_malloc (sizeof (struct grub_xfs_data));
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if (!data)
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return 0;
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/* Read the superblock. */
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if (grub_disk_read (disk, 0, 0,
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sizeof (struct grub_xfs_sblock), (char *) &data->sblock))
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goto fail;
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if (grub_strncmp (data->sblock.magic, "XFSB", 4))
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{
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grub_error (GRUB_ERR_BAD_FS, "not a xfs filesystem");
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goto fail;
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}
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data->diropen.data = data;
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data->diropen.ino = data->sblock.rootino;
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data->diropen.inode_read = 1;
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data->bsize = grub_cpu_to_be32 (data->sblock.bsize);
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data->agsize = grub_cpu_to_be32 (data->sblock.agsize);
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data->disk = disk;
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data->inode = &data->diropen.inode;
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data->pos = 0;
|
||
|
||
grub_xfs_read_inode (data, data->diropen.ino, data->inode);
|
||
|
||
return data;
|
||
fail:
|
||
|
||
grub_free (data);
|
||
|
||
return 0;
|
||
}
|
||
|
||
|
||
static grub_err_t
|
||
grub_xfs_dir (grub_device_t device, const char *path,
|
||
int (*hook) (const char *filename, int dir))
|
||
{
|
||
struct grub_xfs_data *data = 0;;
|
||
struct grub_fshelp_node *fdiro = 0;
|
||
|
||
auto int NESTED_FUNC_ATTR iterate (const char *filename,
|
||
enum grub_fshelp_filetype filetype,
|
||
grub_fshelp_node_t node);
|
||
|
||
int NESTED_FUNC_ATTR iterate (const char *filename,
|
||
enum grub_fshelp_filetype filetype,
|
||
grub_fshelp_node_t node)
|
||
{
|
||
grub_free (node);
|
||
|
||
if (filetype == GRUB_FSHELP_DIR)
|
||
return hook (filename, 1);
|
||
else
|
||
return hook (filename, 0);
|
||
|
||
return 0;
|
||
}
|
||
|
||
#ifndef GRUB_UTIL
|
||
grub_dl_ref (my_mod);
|
||
#endif
|
||
|
||
data = grub_xfs_mount (device->disk);
|
||
if (!data)
|
||
goto fail;
|
||
|
||
grub_fshelp_find_file (path, &data->diropen, &fdiro, grub_xfs_iterate_dir,
|
||
grub_xfs_read_symlink, GRUB_FSHELP_DIR);
|
||
if (grub_errno)
|
||
goto fail;
|
||
|
||
grub_xfs_iterate_dir (fdiro, iterate);
|
||
|
||
fail:
|
||
if (fdiro != &data->diropen)
|
||
grub_free (fdiro);
|
||
grub_free (data);
|
||
|
||
#ifndef GRUB_UTIL
|
||
grub_dl_unref (my_mod);
|
||
#endif
|
||
|
||
return grub_errno;
|
||
|
||
return 0;
|
||
}
|
||
|
||
|
||
/* Open a file named NAME and initialize FILE. */
|
||
static grub_err_t
|
||
grub_xfs_open (struct grub_file *file, const char *name)
|
||
{
|
||
struct grub_xfs_data *data;
|
||
struct grub_fshelp_node *fdiro = 0;
|
||
|
||
#ifndef GRUB_UTIL
|
||
grub_dl_ref (my_mod);
|
||
#endif
|
||
|
||
data = grub_xfs_mount (file->device->disk);
|
||
if (!data)
|
||
goto fail;
|
||
|
||
grub_fshelp_find_file (name, &data->diropen, &fdiro, grub_xfs_iterate_dir,
|
||
grub_xfs_read_symlink, GRUB_FSHELP_REG);
|
||
if (grub_errno)
|
||
goto fail;
|
||
|
||
if (!fdiro->inode_read)
|
||
{
|
||
grub_xfs_read_inode (data, fdiro->ino, &fdiro->inode);
|
||
if (grub_errno)
|
||
goto fail;
|
||
}
|
||
|
||
grub_memcpy (data->inode,
|
||
&fdiro->inode,
|
||
sizeof (struct grub_xfs_inode));
|
||
grub_free (fdiro);
|
||
|
||
file->size = grub_be_to_cpu64 (data->inode->size);
|
||
file->data = data;
|
||
file->offset = 0;
|
||
|
||
return 0;
|
||
|
||
fail:
|
||
if (fdiro != &data->diropen)
|
||
grub_free (fdiro);
|
||
grub_free (data);
|
||
|
||
#ifndef GRUB_UTIL
|
||
grub_dl_unref (my_mod);
|
||
#endif
|
||
|
||
return grub_errno;
|
||
}
|
||
|
||
|
||
static grub_ssize_t
|
||
grub_xfs_read (grub_file_t file, char *buf, grub_ssize_t len)
|
||
{
|
||
struct grub_xfs_data *data =
|
||
(struct grub_xfs_data *) file->data;
|
||
|
||
return grub_xfs_read_file (&data->diropen, file->read_hook,
|
||
file->offset, len, buf);
|
||
}
|
||
|
||
|
||
static grub_err_t
|
||
grub_xfs_close (grub_file_t file)
|
||
{
|
||
grub_free (file->data);
|
||
|
||
#ifndef GRUB_UTIL
|
||
grub_dl_unref (my_mod);
|
||
#endif
|
||
|
||
return GRUB_ERR_NONE;
|
||
}
|
||
|
||
|
||
static grub_err_t
|
||
grub_xfs_label (grub_device_t device, char **label)
|
||
{
|
||
struct grub_xfs_data *data;
|
||
grub_disk_t disk = device->disk;
|
||
|
||
#ifndef GRUB_UTIL
|
||
grub_dl_ref (my_mod);
|
||
#endif
|
||
|
||
data = grub_xfs_mount (disk);
|
||
if (data)
|
||
*label = grub_strndup (data->sblock.label, 12);
|
||
else
|
||
*label = 0;
|
||
|
||
#ifndef GRUB_UTIL
|
||
grub_dl_unref (my_mod);
|
||
#endif
|
||
|
||
grub_free (data);
|
||
|
||
return grub_errno;
|
||
}
|
||
|
||
|
||
|
||
static struct grub_fs grub_xfs_fs =
|
||
{
|
||
.name = "xfs",
|
||
.dir = grub_xfs_dir,
|
||
.open = grub_xfs_open,
|
||
.read = grub_xfs_read,
|
||
.close = grub_xfs_close,
|
||
.label = grub_xfs_label,
|
||
.next = 0
|
||
};
|
||
|
||
#ifdef GRUB_UTIL
|
||
void
|
||
grub_xfs_init (void)
|
||
{
|
||
grub_fs_register (&grub_xfs_fs);
|
||
}
|
||
|
||
void
|
||
grub_xfs_fini (void)
|
||
{
|
||
grub_fs_unregister (&grub_xfs_fs);
|
||
}
|
||
#else /* ! GRUB_UTIL */
|
||
GRUB_MOD_INIT
|
||
{
|
||
grub_fs_register (&grub_xfs_fs);
|
||
my_mod = mod;
|
||
}
|
||
|
||
GRUB_MOD_FINI
|
||
{
|
||
grub_fs_unregister (&grub_xfs_fs);
|
||
}
|
||
#endif /* ! GRUB_UTIL */
|