66e19ef8ba
Add support for UFS version 1 and 2. Add support for the minix filesystem version 1 and 2, both the variants with 14 and 30 long filenames. * conf/i386-pc.rmk (grub_setup_SOURCES): Add fs/ufs.c and fs/minix.c. (grub_emu_SOURCES): Likewise. (pkgdata_MODULES): Add ufs.mod and minix.mod. (ufs_mod_SOURCES): New variable. (ufs_mod_CFLAGS): Likewise. (minix_mod_SOURCES): Likewise. (minix_mod_CFLAGS): Likewise. * conf/powerpc-ieee1275.rmk (grub_emu_SOURCES): Add fs/ufs.c and fs/minix.c. (grubof_SOURCES): Likewise. * fs/ufs.c: New file. * fs/minix.c: New file. * include/grub/fs.h (grub_ufs_init): New prototype. (grub_ufs_fini): Likewise. (grub_minix_init): Likewise. (grub_minix_fini): Likewise. * util/grub-emu.c (main): Initialize and deinitialize UFS and minix fs.
690 lines
16 KiB
C
690 lines
16 KiB
C
/* ufs.c - Unix File System */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2004 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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#define GRUB_UFS_MAGIC 0x11954
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#define GRUB_UFS2_MAGIC 0x19540119
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#define GRUB_UFS_INODE 2
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#define GRUB_UFS_FILETYPE_DIR 4
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#define GRUB_UFS_FILETYPE_LNK 10
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#define GRUB_UFS_MAX_SYMLNK_CNT 8
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#define GRUB_UFS_DIRBLKS 12
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#define GRUB_UFS_INDIRBLKS 3
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#define GRUB_UFS_ATTR_DIR 040000
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/* Calculate in which group the inode can be found. */
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#define inode_group(inode,sblock) ()
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#define UFS_BLKSZ(sblock) (grub_le_to_cpu32 (sblock->bsize))
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#define INODE(data,field) (data->ufs_type == UFS1 ? \
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data->inode. field : data->inode2. field)
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#define INODE_ENDIAN(data,field,bits1,bits2) (data->ufs_type == UFS1 ? \
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grub_le_to_cpu##bits1 (data->inode.field) : \
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grub_le_to_cpu##bits2 (data->inode2.field))
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#define INODE_SIZE(data) INODE_ENDIAN (data,size,32,64)
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#define INODE_MODE(data) INODE_ENDIAN (data,mode,16,16)
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#define INODE_BLKSZ(data) (data->ufs_type == UFS1 ? 32 : 64)
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#define INODE_DIRBLOCKS(data,blk) INODE_ENDIAN \
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(data,blocks.dir_blocks[blk],32,64)
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#define INODE_INDIRBLOCKS(data,blk) INODE_ENDIAN \
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(data,blocks.indir_blocks[blk],32,64)
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/* The blocks on which the superblock can be found. */
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static int sblocklist[] = { 128, 16, 0, 512, -1 };
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struct grub_ufs_sblock
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{
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grub_uint8_t unused[16];
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/* The offset of the inodes in the cylinder group. */
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grub_uint32_t inoblk_offs;
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grub_uint8_t unused2[4];
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/* The start of the cylinder group. */
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grub_uint32_t cylg_offset;
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grub_uint8_t unused3[20];
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/* The size of a block in bytes. */
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grub_int32_t bsize;
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grub_uint8_t unused4[48];
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/* The size of filesystem blocks to disk blocks. */
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grub_uint32_t log2_blksz;
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grub_uint8_t unused5[80];
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/* Inodes stored per cylinder group. */
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grub_uint32_t ino_per_group;
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/* The frags per cylinder group. */
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grub_uint32_t frags_per_group;
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grub_uint8_t unused7[1180];
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/* Magic value to check if this is really a UFS filesystem. */
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grub_uint32_t magic;
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};
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/* UFS inode. */
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struct grub_ufs_inode
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{
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grub_uint16_t mode;
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grub_uint16_t nlinks;
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grub_uint16_t uid;
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grub_uint16_t gid;
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grub_int64_t size;
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grub_uint64_t atime;
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grub_uint64_t mtime;
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grub_uint64_t ctime;
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union
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{
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struct
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{
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grub_uint32_t dir_blocks[GRUB_UFS_DIRBLKS];
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grub_uint32_t indir_blocks[GRUB_UFS_INDIRBLKS];
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} blocks;
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grub_uint8_t symlink[(GRUB_UFS_DIRBLKS + GRUB_UFS_INDIRBLKS) * 4];
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};
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grub_uint32_t flags;
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grub_uint32_t nblocks;
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grub_uint32_t gen;
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grub_uint32_t unused;
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grub_uint8_t pad[12];
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};
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/* UFS inode. */
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struct grub_ufs2_inode
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{
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grub_uint16_t mode;
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grub_uint16_t nlinks;
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grub_uint32_t uid;
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grub_uint32_t gid;
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grub_uint32_t blocksize;
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grub_int64_t size;
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grub_int64_t nblocks;
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grub_uint64_t atime;
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grub_uint64_t mtime;
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grub_uint64_t ctime;
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grub_uint64_t create_time;
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grub_uint32_t atime_sec;
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grub_uint32_t mtime_sec;
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grub_uint32_t ctime_sec;
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grub_uint32_t create_time_sec;
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grub_uint32_t gen;
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grub_uint32_t kernel_flags;
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grub_uint32_t flags;
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grub_uint32_t extsz;
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grub_uint64_t ext[2];
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union
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{
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struct
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{
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grub_uint64_t dir_blocks[GRUB_UFS_DIRBLKS];
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grub_uint64_t indir_blocks[GRUB_UFS_INDIRBLKS];
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} blocks;
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grub_uint8_t symlink[(GRUB_UFS_DIRBLKS + GRUB_UFS_INDIRBLKS) * 8];
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};
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grub_uint8_t unused[24];
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};
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/* Directory entry. */
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struct grub_ufs_dirent
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{
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grub_uint32_t ino;
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grub_uint16_t direntlen;
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grub_uint8_t filetype;
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grub_uint8_t namelen;
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};
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/* Information about a "mounted" ufs filesystem. */
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struct grub_ufs_data
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{
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struct grub_ufs_sblock sblock;
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grub_disk_t disk;
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union
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{
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struct grub_ufs_inode inode;
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struct grub_ufs2_inode inode2;
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};
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enum
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{
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UFS1,
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UFS2,
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UNKNOWN
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} ufs_type;
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int ino;
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int linknest;
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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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/* Forward declaration. */
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static grub_err_t grub_ufs_find_file (struct grub_ufs_data *data,
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const char *path);
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static int
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grub_ufs_get_file_block (struct grub_ufs_data *data, unsigned int blk)
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{
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struct grub_ufs_sblock *sblock = &data->sblock;
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unsigned int indirsz;
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/* Direct. */
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if (blk < GRUB_UFS_DIRBLKS)
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return INODE_DIRBLOCKS (data, blk);
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blk -= GRUB_UFS_DIRBLKS;
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indirsz = UFS_BLKSZ (sblock) / INODE_BLKSZ (data);
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/* Single indirect block. */
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if (blk < indirsz)
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{
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grub_uint32_t indir[UFS_BLKSZ (sblock)];
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grub_disk_read (data->disk, INODE_INDIRBLOCKS (data, 0),
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0, sizeof (indir), (char *) indir);
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return indir[blk];
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}
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blk -= indirsz;
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/* Double indirect block. */
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if (blk < UFS_BLKSZ (sblock) / indirsz)
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{
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grub_uint32_t indir[UFS_BLKSZ (sblock)];
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grub_disk_read (data->disk, INODE_INDIRBLOCKS (data, 1),
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0, sizeof (indir), (char *) indir);
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grub_disk_read (data->disk, indir[blk / indirsz],
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0, sizeof (indir), (char *) indir);
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return indir[blk % indirsz];
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}
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grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET,
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"ufs does not support tripple indirect blocks");
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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_ufs_read_file (struct grub_ufs_data *data,
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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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struct grub_ufs_sblock *sblock = &data->sblock;
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int i;
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int blockcnt;
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/* Adjust len so it we can't read past the end of the file. */
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if (len > INODE_SIZE (data))
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len = INODE_SIZE (data);
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blockcnt = (len + pos + UFS_BLKSZ (sblock) - 1) / UFS_BLKSZ (sblock);
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for (i = pos / UFS_BLKSZ (sblock); i < blockcnt; i++)
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{
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int blknr;
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int blockoff = pos % UFS_BLKSZ (sblock);
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int blockend = UFS_BLKSZ (sblock);
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int skipfirst = 0;
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blknr = grub_ufs_get_file_block (data, i);
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if (grub_errno)
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return -1;
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/* Last block. */
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if (i == blockcnt - 1)
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{
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blockend = (len + pos) % UFS_BLKSZ (sblock);
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if (!blockend)
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blockend = UFS_BLKSZ (sblock);
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}
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/* First block. */
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if (i == (pos / (int) UFS_BLKSZ (sblock)))
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{
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skipfirst = blockoff;
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blockend -= skipfirst;
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}
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/* XXX: If the block number is 0 this block is not stored on
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disk but is zero filled instead. */
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if (blknr)
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{
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data->disk->read_hook = read_hook;
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grub_disk_read (data->disk,
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blknr << grub_le_to_cpu32 (data->sblock.log2_blksz),
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skipfirst, blockend, buf);
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data->disk->read_hook = 0;
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if (grub_errno)
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return -1;
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}
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else
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grub_memset (buf, UFS_BLKSZ (sblock) - skipfirst, 0);
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buf += UFS_BLKSZ (sblock) - skipfirst;
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}
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return len;
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}
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/* Read inode INO from the mounted filesystem described by DATA. This
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inode is used by default now. */
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static grub_err_t
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grub_ufs_read_inode (struct grub_ufs_data *data, int ino)
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{
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struct grub_ufs_sblock *sblock = &data->sblock;
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/* Determine the group the inode is in. */
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int group = ino / grub_le_to_cpu32 (sblock->ino_per_group);
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/* Determine the inode within the group. */
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int grpino = ino % grub_le_to_cpu32 (sblock->ino_per_group);
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/* The first block of the group. */
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int grpblk = group * (grub_le_to_cpu32 (sblock->frags_per_group));
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if (data->ufs_type == UFS1)
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{
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struct grub_ufs_inode *inode = &data->inode;
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grub_disk_read (data->disk,
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(((grub_le_to_cpu32 (sblock->inoblk_offs) + grpblk)
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<< grub_le_to_cpu32 (data->sblock.log2_blksz)))
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+ grpino / 4,
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(grpino % 4) * sizeof (struct grub_ufs_inode),
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sizeof (struct grub_ufs_inode),
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(char *) inode);
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}
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else
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{
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struct grub_ufs2_inode *inode = &data->inode2;
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grub_disk_read (data->disk,
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(((grub_le_to_cpu32 (sblock->inoblk_offs) + grpblk)
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<< grub_le_to_cpu32 (data->sblock.log2_blksz)))
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+ grpino / 2,
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(grpino % 2) * sizeof (struct grub_ufs2_inode),
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sizeof (struct grub_ufs2_inode),
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(char *) inode);
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}
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data->ino = ino;
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return grub_errno;
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}
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/* Lookup the symlink the current inode points to. INO is the inode
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number of the directory the symlink is relative to. */
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static grub_err_t
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grub_ufs_lookup_symlink (struct grub_ufs_data *data, int ino)
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{
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char symlink[INODE_SIZE (data)];
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if (++data->linknest > GRUB_UFS_MAX_SYMLNK_CNT)
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return grub_error (GRUB_ERR_SYMLINK_LOOP, "too deep nesting of symlinks");
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if (INODE_SIZE (data) < (GRUB_UFS_DIRBLKS + GRUB_UFS_INDIRBLKS
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* INODE_BLKSZ (data)))
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grub_strcpy (symlink, INODE (data, symlink));
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else
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{
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grub_disk_read (data->disk,
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(INODE_DIRBLOCKS (data, 0)
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<< grub_le_to_cpu32 (data->sblock.log2_blksz)),
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0, INODE_SIZE (data), symlink);
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symlink[INODE_SIZE (data)] = '\0';
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}
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/* The symlink is an absolute path, go back to the root inode. */
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if (symlink[0] == '/')
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ino = GRUB_UFS_INODE;
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/* Now load in the old inode. */
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if (grub_ufs_read_inode (data, ino))
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return grub_errno;
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grub_ufs_find_file (data, symlink);
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if (grub_errno)
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grub_error (grub_errno, "Can not follow symlink `%s'.", symlink);
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return grub_errno;
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}
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/* Find the file with the pathname PATH on the filesystem described by
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DATA. */
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static grub_err_t
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grub_ufs_find_file (struct grub_ufs_data *data, const char *path)
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{
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char fpath[grub_strlen (path)];
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char *name = fpath;
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char *next;
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unsigned int pos = 0;
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int dirino;
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grub_strncpy (fpath, path, grub_strlen (path));
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/* Skip the first slash. */
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if (name[0] == '/')
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{
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name++;
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if (!*name)
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return 0;
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}
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/* Extract the actual part from the pathname. */
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next = grub_strchr (name, '/');
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if (next)
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{
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next[0] = '\0';
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next++;
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}
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do
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{
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struct grub_ufs_dirent dirent;
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if (grub_strlen (name) == 0)
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return GRUB_ERR_NONE;
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if (grub_ufs_read_file (data, 0, pos, sizeof (dirent),
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(char *) &dirent) < 0)
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return grub_errno;
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{
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char filename[dirent.namelen + 1];
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if (grub_ufs_read_file (data, 0, pos + sizeof (dirent),
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dirent.namelen, filename) < 0)
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return grub_errno;
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filename[dirent.namelen] = '\0';
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if (!grub_strcmp (name, filename))
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{
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dirino = data->ino;
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grub_ufs_read_inode (data, grub_le_to_cpu32 (dirent.ino));
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if (dirent.filetype == GRUB_UFS_FILETYPE_LNK)
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{
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grub_ufs_lookup_symlink (data, dirino);
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if (grub_errno)
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return grub_errno;
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}
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if (!next)
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return 0;
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pos = 0;
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name = next;
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next = grub_strchr (name, '/');
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if (next)
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{
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next[0] = '\0';
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next++;
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}
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if (!(dirent.filetype & GRUB_UFS_FILETYPE_DIR))
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return grub_error (GRUB_ERR_BAD_FILE_TYPE, "not a directory");
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continue;
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}
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}
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pos += grub_le_to_cpu16 (dirent.direntlen);
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} while (pos < grub_le_to_cpu32 (INODE_SIZE (data)));
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grub_error (GRUB_ERR_FILE_NOT_FOUND, "file not found");
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return grub_errno;
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}
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/* Mount the filesystem on the disk DISK. */
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static struct grub_ufs_data *
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grub_ufs_mount (grub_disk_t disk)
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{
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struct grub_ufs_data *data;
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int *sblklist = sblocklist;
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data = grub_malloc (sizeof (struct grub_ufs_data));
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if (!data)
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return 0;
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/* Find a UFS1 or UFS2 sblock. */
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data->ufs_type = UNKNOWN;
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while (*sblklist != -1)
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{
|
||
grub_disk_read (disk, *sblklist, 0, sizeof (struct grub_ufs_sblock),
|
||
(char *) &data->sblock);
|
||
if (grub_errno)
|
||
goto fail;
|
||
|
||
if (grub_le_to_cpu32 (data->sblock.magic) == GRUB_UFS_MAGIC)
|
||
{
|
||
data->ufs_type = UFS1;
|
||
break;
|
||
}
|
||
else if (grub_le_to_cpu32 (data->sblock.magic) == GRUB_UFS2_MAGIC)
|
||
{
|
||
data->ufs_type = UFS2;
|
||
break;
|
||
}
|
||
sblklist++;
|
||
}
|
||
if (data->ufs_type == UNKNOWN)
|
||
{
|
||
grub_error (GRUB_ERR_BAD_FS, "not an ufs filesystem");
|
||
goto fail;
|
||
}
|
||
|
||
data->disk = disk;
|
||
data->linknest = 0;
|
||
return data;
|
||
|
||
fail:
|
||
grub_free (data);
|
||
return 0;
|
||
}
|
||
|
||
|
||
static grub_err_t
|
||
grub_ufs_dir (grub_device_t device, const char *path,
|
||
int (*hook) (const char *filename, int dir))
|
||
{
|
||
struct grub_ufs_data *data;
|
||
struct grub_ufs_sblock *sblock;
|
||
unsigned int pos = 0;
|
||
|
||
data = grub_ufs_mount (device->disk);
|
||
if (!data)
|
||
return grub_errno;
|
||
|
||
grub_ufs_read_inode (data, GRUB_UFS_INODE);
|
||
if (grub_errno)
|
||
return grub_errno;
|
||
|
||
sblock = &data->sblock;
|
||
|
||
if (!path || path[0] != '/')
|
||
{
|
||
grub_error (GRUB_ERR_BAD_FILENAME, "bad filename");
|
||
return grub_errno;
|
||
}
|
||
|
||
grub_ufs_find_file (data, path);
|
||
if (grub_errno)
|
||
goto fail;
|
||
|
||
if (!(INODE_MODE (data) & GRUB_UFS_ATTR_DIR))
|
||
{
|
||
grub_error (GRUB_ERR_BAD_FILE_TYPE, "not a directory");
|
||
goto fail;
|
||
}
|
||
|
||
while (pos < INODE_SIZE (data))
|
||
{
|
||
struct grub_ufs_dirent dirent;
|
||
|
||
if (grub_ufs_read_file (data, 0, pos, sizeof (dirent),
|
||
(char *) &dirent) < 0)
|
||
break;
|
||
|
||
{
|
||
char filename[dirent.namelen + 1];
|
||
|
||
if (grub_ufs_read_file (data, 0, pos + sizeof (dirent),
|
||
dirent.namelen, filename) < 0)
|
||
break;
|
||
|
||
filename[dirent.namelen] = '\0';
|
||
if (hook (filename, dirent.filetype == GRUB_UFS_FILETYPE_DIR))
|
||
break;
|
||
}
|
||
|
||
pos += grub_le_to_cpu16 (dirent.direntlen);
|
||
}
|
||
|
||
fail:
|
||
grub_free (data);
|
||
|
||
return grub_errno;
|
||
}
|
||
|
||
|
||
/* Open a file named NAME and initialize FILE. */
|
||
static grub_err_t
|
||
grub_ufs_open (struct grub_file *file, const char *name)
|
||
{
|
||
struct grub_ufs_data *data;
|
||
data = grub_ufs_mount (file->device->disk);
|
||
if (!data)
|
||
return grub_errno;
|
||
|
||
grub_ufs_read_inode (data, 2);
|
||
if (grub_errno)
|
||
{
|
||
grub_free (data);
|
||
return grub_errno;
|
||
}
|
||
|
||
if (!name || name[0] != '/')
|
||
{
|
||
grub_error (GRUB_ERR_BAD_FILENAME, "bad filename");
|
||
return grub_errno;
|
||
}
|
||
|
||
grub_ufs_find_file (data, name);
|
||
if (grub_errno)
|
||
{
|
||
grub_free (data);
|
||
return grub_errno;
|
||
}
|
||
|
||
file->data = data;
|
||
file->size = INODE_SIZE (data);
|
||
|
||
return GRUB_ERR_NONE;
|
||
}
|
||
|
||
|
||
static grub_ssize_t
|
||
grub_ufs_read (grub_file_t file, char *buf, grub_ssize_t len)
|
||
{
|
||
struct grub_ufs_data *data =
|
||
(struct grub_ufs_data *) file->data;
|
||
|
||
return grub_ufs_read_file (data, file->read_hook, file->offset, len, buf);
|
||
}
|
||
|
||
|
||
static grub_err_t
|
||
grub_ufs_close (grub_file_t file)
|
||
{
|
||
grub_free (file->data);
|
||
|
||
return GRUB_ERR_NONE;
|
||
}
|
||
|
||
|
||
static grub_err_t
|
||
grub_ufs_label (grub_device_t device __attribute ((unused)),
|
||
char **label __attribute ((unused)))
|
||
{
|
||
return GRUB_ERR_NONE;
|
||
}
|
||
|
||
|
||
static struct grub_fs grub_ufs_fs =
|
||
{
|
||
.name = "ufs",
|
||
.dir = grub_ufs_dir,
|
||
.open = grub_ufs_open,
|
||
.read = grub_ufs_read,
|
||
.close = grub_ufs_close,
|
||
.label = grub_ufs_label,
|
||
.next = 0
|
||
};
|
||
|
||
#ifdef GRUB_UTIL
|
||
void
|
||
grub_ufs_init (void)
|
||
{
|
||
grub_fs_register (&grub_ufs_fs);
|
||
}
|
||
|
||
void
|
||
grub_ufs_fini (void)
|
||
{
|
||
grub_fs_unregister (&grub_ufs_fs);
|
||
}
|
||
#else /* ! GRUB_UTIL */
|
||
GRUB_MOD_INIT
|
||
{
|
||
grub_fs_register (&grub_ufs_fs);
|
||
my_mod = mod;
|
||
}
|
||
|
||
GRUB_MOD_FINI
|
||
{
|
||
grub_fs_unregister (&grub_ufs_fs);
|
||
}
|
||
#endif /* ! GRUB_UTIL */
|