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/* ufs.c - Unix File System */
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2004,2005,2007,2008,2009 Free Software Foundation, Inc.
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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#include <grub/file.h>
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#include <grub/misc.h>
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#include <grub/disk.h>
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#include <grub/types.h>
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#define GRUB_UFS_MAGIC 0x19540119
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#define GRUB_UFS_MAGIC 0x11954
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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_TYPE 0160000
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#define GRUB_UFS_ATTR_FILE 0100000
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#define GRUB_UFS_ATTR_DIR 0040000
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#define GRUB_UFS_ATTR_LNK 0120000
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#define GRUB_UFS_VOLNAME_LEN 32
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/* Calculate in which group the inode can be found. */
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#define UFS_BLKSZ(sblock) (grub_le_to_cpu32 (sblock->bsize))
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#define INODE(data,field) data->inode. field
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#define INODE_ENDIAN(data,field,bits1,bits2) grub_le_to_cpu##bits2 (data->inode.field)
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#define INODE_ENDIAN(data,field,bits1,bits2) grub_le_to_cpu##bits1 (data->inode.field)
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#define INODE_SIZE(data) INODE_ENDIAN (data,size,32,64)
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#define INODE_NBLOCKS(data) INODE_ENDIAN (data,nblocks,32,64)
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#define INODE_MODE(data) INODE_ENDIAN (data,mode,16,16)
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#define UFS_INODE_PER_BLOCK 2
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#define UFS_INODE_PER_BLOCK 4
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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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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_uint32_t cylg_mask;
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grub_uint8_t unused4[12];
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/* The size of a block in bytes. */
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grub_uint8_t unused5[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 unused6[40];
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grub_uint32_t uuidhi;
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grub_uint32_t uuidlow;
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grub_uint8_t unused7[32];
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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 unused8[488];
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/* Volume name for UFS2. */
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grub_uint8_t volume_name[GRUB_UFS_VOLNAME_LEN];
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grub_uint8_t unused9[360];
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grub_uint64_t mtime2;
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grub_uint8_t unused10[292];
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/* Magic value to check if this is really a UFS filesystem. */
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struct grub_ufs_inode
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grub_uint16_t nlinks;
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grub_uint32_t blocksize;
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grub_int64_t nblocks;
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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 kernel_flags;
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grub_uint64_t ext[2];
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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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grub_uint8_t symlink[(GRUB_UFS_DIRBLKS + GRUB_UFS_INDIRBLKS) * 8];
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grub_uint8_t unused[24];
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} __attribute__ ((packed));
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struct grub_ufs_inode
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grub_uint16_t nlinks;
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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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grub_uint8_t symlink[(GRUB_UFS_DIRBLKS + GRUB_UFS_INDIRBLKS) * 4];
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grub_uint32_t nblocks;
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grub_uint32_t unused;
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grub_uint8_t pad[12];
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} __attribute__ ((packed));
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/* Directory entry. */
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struct grub_ufs_dirent
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grub_uint16_t direntlen;
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grub_uint16_t namelen;
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grub_uint8_t filetype_bsd;
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grub_uint8_t namelen_bsd;
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} __attribute__ ((packed));
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/* Information about a "mounted" ufs filesystem. */
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struct grub_ufs_sblock sblock;
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struct grub_ufs_inode inode;
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static grub_dl_t my_mod;
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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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static grub_disk_addr_t
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grub_ufs_get_file_block (struct grub_ufs_data *data, unsigned int blk)
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struct grub_ufs_sblock *sblock = &data->sblock;
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unsigned int indirsz;
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if (blk < GRUB_UFS_DIRBLKS)
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return INODE_DIRBLOCKS (data, blk);
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log2_blksz = grub_le_to_cpu32 (data->sblock.log2_blksz);
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blk -= GRUB_UFS_DIRBLKS;
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indirsz = UFS_BLKSZ (sblock) / INODE_BLKSZ;
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/* Single indirect block. */
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grub_uint64_t indir[UFS_BLKSZ (sblock) / sizeof (grub_uint64_t)];
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grub_uint32_t indir[UFS_BLKSZ (sblock) / sizeof (grub_uint32_t)];
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grub_disk_read (data->disk, INODE_INDIRBLOCKS (data, 0) << log2_blksz,
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0, sizeof (indir), indir);
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/* Double indirect block. */
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if (blk < indirsz * indirsz)
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grub_uint64_t indir[UFS_BLKSZ (sblock) / sizeof (grub_uint64_t)];
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grub_uint32_t indir[UFS_BLKSZ (sblock) / sizeof (grub_uint32_t)];
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grub_disk_read (data->disk, INODE_INDIRBLOCKS (data, 1) << log2_blksz,
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0, sizeof (indir), indir);
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grub_disk_read (data->disk,
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(indir [blk / indirsz])
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0, sizeof (indir), indir);
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return indir[blk % indirsz];
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grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET,
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"ufs does not support triple indirect blocks");
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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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grub_ufs_read_file (struct grub_ufs_data *data,
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void NESTED_FUNC_ATTR (*read_hook) (grub_disk_addr_t sector,
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unsigned offset, unsigned length),
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int pos, grub_size_t len, char *buf)
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struct grub_ufs_sblock *sblock = &data->sblock;
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/* Adjust len so it we can't read past the end of the file. */
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if (len + pos > INODE_SIZE (data))
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len = INODE_SIZE (data) - pos;
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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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int blockoff = pos % UFS_BLKSZ (sblock);
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int blockend = UFS_BLKSZ (sblock);
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blknr = grub_ufs_get_file_block (data, i);
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if (i == blockcnt - 1)
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blockend = (len + pos) % UFS_BLKSZ (sblock);
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blockend = UFS_BLKSZ (sblock);
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if (i == (pos / (int) UFS_BLKSZ (sblock)))
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skipfirst = blockoff;
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blockend -= skipfirst;
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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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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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grub_memset (buf, UFS_BLKSZ (sblock) - skipfirst, 0);
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buf += UFS_BLKSZ (sblock) - skipfirst;
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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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grub_ufs_read_inode (struct grub_ufs_data *data, int ino, char *inode)
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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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grpblk += grub_le_to_cpu32 (sblock->cylg_offset)
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* (group & (~grub_le_to_cpu32 (sblock->cylg_mask)));
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inode = (char *) &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 / UFS_INODE_PER_BLOCK,
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(grpino % UFS_INODE_PER_BLOCK)
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* sizeof (struct grub_ufs_inode),
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sizeof (struct grub_ufs_inode),
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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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grub_ufs_lookup_symlink (struct grub_ufs_data *data, int ino)
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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_NBLOCKS (data) == 0)
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grub_strcpy (symlink, (char *) INODE (data, symlink));
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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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/* 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, 0))
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grub_ufs_find_file (data, symlink);
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grub_error (grub_errno, "cannot follow symlink `%s'", symlink);
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/* Find the file with the pathname PATH on the filesystem described by
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grub_ufs_find_file (struct grub_ufs_data *data, const char *path)
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char fpath[grub_strlen (path) + 1];
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unsigned int pos = 0;
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grub_strcpy (fpath, path);
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/* Skip the first slash. */
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/* Extract the actual part from the pathname. */
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next = grub_strchr (name, '/');
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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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namelen = dirent.namelen_bsd;
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namelen = grub_le_to_cpu16 (dirent.namelen);
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char filename[namelen + 1];
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if (grub_ufs_read_file (data, 0, pos + sizeof (dirent),
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namelen, filename) < 0)
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filename[namelen] = '\0';
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if (!grub_strcmp (name, filename))
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grub_ufs_read_inode (data, grub_le_to_cpu32 (dirent.ino), 0);
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if ((INODE_MODE(data) & GRUB_UFS_ATTR_TYPE)
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== GRUB_UFS_ATTR_LNK)
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grub_ufs_lookup_symlink (data, dirino);
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next = grub_strchr (name, '/');
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if ((INODE_MODE(data) & GRUB_UFS_ATTR_TYPE) != GRUB_UFS_ATTR_DIR)
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return grub_error (GRUB_ERR_BAD_FILE_TYPE, "not a directory");
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pos += grub_le_to_cpu16 (dirent.direntlen);
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} while (pos < INODE_SIZE (data));
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grub_error (GRUB_ERR_FILE_NOT_FOUND, "file not found");
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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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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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/* Find a UFS sblock. */
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while (*sblklist != -1)
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grub_disk_read (disk, *sblklist, 0, sizeof (struct grub_ufs_sblock),
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if (grub_le_to_cpu32 (data->sblock.magic) == GRUB_UFS_MAGIC)
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if (grub_errno == GRUB_ERR_NONE || grub_errno == GRUB_ERR_OUT_OF_RANGE)
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grub_error (GRUB_ERR_BAD_FS, "not an ufs2 filesystem");
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grub_error (GRUB_ERR_BAD_FS, "not an ufs1 filesystem");
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grub_ufs_dir (grub_device_t device, const char *path,
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int (*hook) (const char *filename,
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const struct grub_dirhook_info *info))
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struct grub_ufs_data *data;
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unsigned int pos = 0;
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data = grub_ufs_mount (device->disk);
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grub_ufs_read_inode (data, GRUB_UFS_INODE, 0);
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if (!path || path[0] != '/')
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grub_error (GRUB_ERR_BAD_FILENAME, "bad filename");
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grub_ufs_find_file (data, path);
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if ((INODE_MODE (data) & GRUB_UFS_ATTR_TYPE) != GRUB_UFS_ATTR_DIR)
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grub_error (GRUB_ERR_BAD_FILE_TYPE, "not a directory");
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while (pos < INODE_SIZE (data))
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struct grub_ufs_dirent dirent;
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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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namelen = dirent.namelen_bsd;
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namelen = grub_le_to_cpu16 (dirent.namelen);
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char filename[namelen + 1];
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struct grub_dirhook_info info;
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struct grub_ufs_inode inode;
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grub_memset (&info, 0, sizeof (info));
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if (grub_ufs_read_file (data, 0, pos + sizeof (dirent),
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namelen, filename) < 0)
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filename[namelen] = '\0';
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grub_ufs_read_inode (data, dirent.ino, (char *) &inode);
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info.dir = ((grub_le_to_cpu16 (inode.mode) & GRUB_UFS_ATTR_TYPE)
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== GRUB_UFS_ATTR_DIR);
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info.mtime = grub_le_to_cpu64 (inode.mtime);
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if (hook (filename, &info))
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pos += grub_le_to_cpu16 (dirent.direntlen);
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/* Open a file named NAME and initialize FILE. */
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grub_ufs_open (struct grub_file *file, const char *name)
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struct grub_ufs_data *data;
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data = grub_ufs_mount (file->device->disk);
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grub_ufs_read_inode (data, 2, 0);
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if (!name || name[0] != '/')
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grub_error (GRUB_ERR_BAD_FILENAME, "bad filename");
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grub_ufs_find_file (data, name);
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file->size = INODE_SIZE (data);
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return GRUB_ERR_NONE;
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grub_ufs_read (grub_file_t file, char *buf, grub_size_t len)
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struct grub_ufs_data *data =
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(struct grub_ufs_data *) file->data;
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return grub_ufs_read_file (data, file->read_hook, file->offset, len, buf);
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grub_ufs_close (grub_file_t file)
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grub_free (file->data);
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return GRUB_ERR_NONE;
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grub_ufs_label (grub_device_t device, char **label)
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struct grub_ufs_data *data = 0;
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grub_dl_ref (my_mod);
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data = grub_ufs_mount (device->disk);
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*label = grub_strdup ((char *) data->sblock.volume_name);
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grub_dl_unref (my_mod);
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grub_ufs_uuid (grub_device_t device, char **uuid)
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struct grub_ufs_data *data;
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grub_disk_t disk = device->disk;
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grub_dl_ref (my_mod);
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data = grub_ufs_mount (disk);
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if (data && (data->sblock.uuidhi != 0 || data->sblock.uuidlow != 0))
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*uuid = grub_xasprintf ("%08x%08x",
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(unsigned) grub_le_to_cpu32 (data->sblock.uuidhi),
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(unsigned) grub_le_to_cpu32 (data->sblock.uuidlow));
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grub_dl_unref (my_mod);
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grub_ufs_mtime (grub_device_t device, grub_int32_t *tm)
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struct grub_ufs_data *data = 0;
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grub_dl_ref (my_mod);
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data = grub_ufs_mount (device->disk);
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*tm = grub_le_to_cpu64 (data->sblock.mtime2);
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*tm = grub_le_to_cpu32 (data->sblock.mtime);
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grub_dl_unref (my_mod);
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static struct grub_fs grub_ufs_fs =
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.open = grub_ufs_open,
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.read = grub_ufs_read,
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.close = grub_ufs_close,
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.label = grub_ufs_label,
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.uuid = grub_ufs_uuid,
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.mtime = grub_ufs_mtime,
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grub_fs_register (&grub_ufs_fs);
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grub_fs_unregister (&grub_ufs_fs);
added
removed
grub-core/fs/ufs.c
