900 lines
22 KiB
C
900 lines
22 KiB
C
/* xfs.c - XFS. */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2005,2006,2007,2008,2009 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <grub/err.h>
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#include <grub/file.h>
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#include <grub/mm.h>
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#include <grub/misc.h>
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#include <grub/disk.h>
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#include <grub/dl.h>
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#include <grub/types.h>
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#include <grub/fshelp.h>
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GRUB_MOD_LICENSE ("GPLv3+");
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#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[24];
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grub_uint16_t uuid[8];
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grub_uint8_t unused2[8];
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grub_uint64_t rootino;
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grub_uint8_t unused3[20];
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grub_uint32_t agsize;
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grub_uint8_t unused4[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 log2_sect;
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grub_uint8_t log2_inode;
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grub_uint8_t log2_inop;
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grub_uint8_t log2_agblk;
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grub_uint8_t unused6[67];
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grub_uint8_t log2_dirblk;
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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 count;
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grub_uint8_t smallino;
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union
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{
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grub_uint32_t i4;
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grub_uint64_t i8;
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} parent __attribute__ ((packed));
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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_btree_node
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{
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grub_uint8_t magic[4];
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grub_uint16_t level;
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grub_uint16_t numrecs;
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grub_uint64_t left;
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grub_uint64_t right;
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grub_uint64_t keys[1];
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} __attribute__ ((packed));
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struct grub_xfs_btree_root
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{
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grub_uint16_t level;
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grub_uint16_t numrecs;
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grub_uint64_t keys[1];
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} __attribute__ ((packed));
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struct grub_xfs_time
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{
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grub_uint32_t sec;
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grub_uint32_t nanosec;
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} __attribute__ ((packed));
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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[26];
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struct grub_xfs_time atime;
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struct grub_xfs_time mtime;
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struct grub_xfs_time ctime;
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grub_uint64_t size;
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grub_uint64_t nblocks;
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grub_uint32_t extsize;
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grub_uint32_t nextents;
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grub_uint16_t unused3;
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grub_uint8_t fork_offset;
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grub_uint8_t unused4[17];
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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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struct grub_xfs_btree_root btree;
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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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grub_uint64_t ino;
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int inode_read;
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struct grub_xfs_inode inode;
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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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grub_disk_t disk;
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int pos;
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int bsize;
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grub_uint32_t agsize;
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struct grub_fshelp_node diropen;
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};
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static grub_dl_t my_mod;
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/* Filetype information as used in inodes. */
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#define FILETYPE_INO_MASK 0170000
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#define FILETYPE_INO_REG 0100000
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#define FILETYPE_INO_DIRECTORY 0040000
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#define FILETYPE_INO_SYMLINK 0120000
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static inline int
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GRUB_XFS_INO_AGBITS(struct grub_xfs_data *data)
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{
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return ((data)->sblock.log2_agblk + (data)->sblock.log2_inop);
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}
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static inline grub_uint64_t
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GRUB_XFS_INO_INOINAG (struct grub_xfs_data *data,
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grub_uint64_t ino)
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{
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return (grub_be_to_cpu64 (ino) & ((1LL << GRUB_XFS_INO_AGBITS (data)) - 1));
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}
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static inline grub_uint64_t
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GRUB_XFS_INO_AG (struct grub_xfs_data *data,
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grub_uint64_t ino)
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{
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return (grub_be_to_cpu64 (ino) >> GRUB_XFS_INO_AGBITS (data));
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}
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static inline grub_disk_addr_t
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GRUB_XFS_FSB_TO_BLOCK (struct grub_xfs_data *data, grub_disk_addr_t fsb)
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{
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return ((fsb >> data->sblock.log2_agblk) * data->agsize
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+ (fsb & ((1LL << data->sblock.log2_agblk) - 1)));
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}
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static inline grub_uint64_t
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GRUB_XFS_EXTENT_OFFSET (grub_xfs_extent *exts, int ex)
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{
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return ((grub_be_to_cpu32 (exts[ex][0]) & ~(1 << 31)) << 23
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| grub_be_to_cpu32 (exts[ex][1]) >> 9);
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}
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static inline grub_uint64_t
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GRUB_XFS_EXTENT_BLOCK (grub_xfs_extent *exts, int ex)
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{
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return ((grub_uint64_t) (grub_be_to_cpu32 (exts[ex][1])
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& (0x1ff)) << 43
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| (grub_uint64_t) grub_be_to_cpu32 (exts[ex][2]) << 11
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| grub_be_to_cpu32 (exts[ex][3]) >> 21);
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}
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static inline grub_uint64_t
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GRUB_XFS_EXTENT_SIZE (grub_xfs_extent *exts, int ex)
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{
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return (grub_be_to_cpu32 (exts[ex][3]) & ((1 << 20) - 1));
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}
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static inline int
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GRUB_XFS_ROUND_TO_DIRENT (int pos)
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{
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return ((((pos) + 8 - 1) / 8) * 8);
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}
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static inline int
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GRUB_XFS_NEXT_DIRENT (int pos, int len)
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{
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return (pos) + GRUB_XFS_ROUND_TO_DIRENT (8 + 1 + len + 2);
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}
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static inline grub_uint64_t
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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 >> data->sblock.log2_inop) + 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
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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 << data->sblock.log2_inop) - 1)) <<
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data->sblock.log2_inode);
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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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grub_uint64_t 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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1 << data->sblock.log2_inode, inode))
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return grub_errno;
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if (grub_strncmp ((char *) inode->magic, "IN", 2))
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return grub_error (GRUB_ERR_BAD_FS, "not a correct XFS inode");
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return 0;
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}
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static grub_disk_addr_t
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grub_xfs_read_block (grub_fshelp_node_t node, grub_disk_addr_t fileblock)
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{
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struct grub_xfs_btree_node *leaf = 0;
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int ex, nrec;
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grub_xfs_extent *exts;
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grub_uint64_t ret = 0;
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if (node->inode.format == XFS_INODE_FORMAT_BTREE)
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{
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grub_uint64_t *keys;
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int recoffset;
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leaf = grub_malloc (node->data->bsize);
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if (leaf == 0)
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return 0;
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nrec = grub_be_to_cpu16 (node->inode.data.btree.numrecs);
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keys = &node->inode.data.btree.keys[0];
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if (node->inode.fork_offset)
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recoffset = (node->inode.fork_offset
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- ((char *) &node->inode.data.btree.keys - (char *) &node->inode))
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/ (2 * sizeof (grub_uint64_t));
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else
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recoffset = ((1 << node->data->sblock.log2_inode)
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- ((char *) &node->inode.data.btree.keys
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- (char *) &node->inode))
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/ (2 * sizeof (grub_uint64_t));
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do
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{
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int i;
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for (i = 0; i < nrec; i++)
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{
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if (fileblock < grub_be_to_cpu64 (keys[i]))
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break;
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}
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/* Sparse block. */
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if (i == 0)
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{
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grub_free (leaf);
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return 0;
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}
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if (grub_disk_read (node->data->disk,
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GRUB_XFS_FSB_TO_BLOCK (node->data, grub_be_to_cpu64 (keys[i - 1 + recoffset])) << (node->data->sblock.log2_bsize - GRUB_DISK_SECTOR_BITS),
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0, node->data->bsize, leaf))
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return 0;
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if (grub_strncmp ((char *) leaf->magic, "BMAP", 4))
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{
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grub_free (leaf);
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grub_error (GRUB_ERR_BAD_FS, "not a correct XFS BMAP node");
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return 0;
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}
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nrec = grub_be_to_cpu16 (leaf->numrecs);
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keys = &leaf->keys[0];
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recoffset = ((node->data->bsize - ((char *) &leaf->keys
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- (char *) leaf))
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/ (2 * sizeof (grub_uint64_t)));
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}
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while (leaf->level);
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exts = (grub_xfs_extent *) keys;
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}
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else if (node->inode.format == XFS_INODE_FORMAT_EXT)
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{
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nrec = grub_be_to_cpu32 (node->inode.nextents);
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exts = &node->inode.data.extents[0];
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}
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else
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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 < nrec; ex++)
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{
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grub_uint64_t start = GRUB_XFS_EXTENT_BLOCK (exts, ex);
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grub_uint64_t offset = GRUB_XFS_EXTENT_OFFSET (exts, ex);
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grub_uint64_t size = GRUB_XFS_EXTENT_SIZE (exts, ex);
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/* Sparse block. */
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if (fileblock < offset)
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break;
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else if (fileblock < offset + size)
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{
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ret = (fileblock - offset + start);
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break;
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}
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}
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grub_free (leaf);
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return GRUB_XFS_FSB_TO_BLOCK(node->data, ret);
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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 NESTED_FUNC_ATTR (*read_hook) (grub_disk_addr_t sector,
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unsigned offset, unsigned length),
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grub_off_t pos, grub_size_t 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 NESTED_FUNC_ATTR call_hook (grub_uint64_t ino, const char *filename);
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int NESTED_FUNC_ATTR call_hook (grub_uint64_t ino, const 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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- sizeof (struct grub_xfs_inode)
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+ (1 << diro->data->sblock.log2_inode));
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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.i4);
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parent = grub_cpu_to_be64 (parent);
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/* The header is a bit smaller than usual. */
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de = (struct grub_xfs_dir_entry *) ((char *) de - 4);
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}
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else
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{
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parent = diro->inode.data.dir.dirhead.parent.i8;
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}
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|
||
/* Synthesize the direntries for `.' and `..'. */
|
||
if (call_hook (diro->ino, "."))
|
||
return 1;
|
||
|
||
if (call_hook (parent, ".."))
|
||
return 1;
|
||
|
||
for (i = 0; i < diro->inode.data.dir.dirhead.count; i++)
|
||
{
|
||
grub_uint64_t ino;
|
||
grub_uint8_t *inopos = (((grub_uint8_t *) de)
|
||
+ sizeof (struct grub_xfs_dir_entry)
|
||
+ de->len - 1);
|
||
char name[de->len + 1];
|
||
|
||
/* inopos might be unaligned. */
|
||
if (smallino)
|
||
ino = (((grub_uint32_t) inopos[0]) << 24)
|
||
| (((grub_uint32_t) inopos[1]) << 16)
|
||
| (((grub_uint32_t) inopos[2]) << 8)
|
||
| (((grub_uint32_t) inopos[3]) << 0);
|
||
else
|
||
ino = (((grub_uint64_t) inopos[0]) << 56)
|
||
| (((grub_uint64_t) inopos[1]) << 48)
|
||
| (((grub_uint64_t) inopos[2]) << 40)
|
||
| (((grub_uint64_t) inopos[3]) << 32)
|
||
| (((grub_uint64_t) inopos[4]) << 24)
|
||
| (((grub_uint64_t) inopos[5]) << 16)
|
||
| (((grub_uint64_t) inopos[6]) << 8)
|
||
| (((grub_uint64_t) inopos[7]) << 0);
|
||
ino = grub_cpu_to_be64 (ino);
|
||
|
||
grub_memcpy (name, de->name, de->len);
|
||
name[de->len] = '\0';
|
||
if (call_hook (ino, name))
|
||
return 1;
|
||
|
||
de = ((struct grub_xfs_dir_entry *)
|
||
(((char *) de)+ sizeof (struct grub_xfs_dir_entry) + de->len
|
||
+ ((smallino ? sizeof (grub_uint32_t)
|
||
: sizeof (grub_uint64_t))) - 1));
|
||
}
|
||
break;
|
||
}
|
||
|
||
case XFS_INODE_FORMAT_BTREE:
|
||
case XFS_INODE_FORMAT_EXT:
|
||
{
|
||
grub_ssize_t numread;
|
||
char *dirblock;
|
||
grub_uint64_t blk;
|
||
int dirblk_size, dirblk_log2;
|
||
|
||
dirblk_log2 = (dir->data->sblock.log2_bsize
|
||
+ dir->data->sblock.log2_dirblk);
|
||
dirblk_size = 1 << dirblk_log2;
|
||
|
||
dirblock = grub_malloc (dirblk_size);
|
||
if (! dirblock)
|
||
return 0;
|
||
|
||
/* Iterate over every block the directory has. */
|
||
for (blk = 0;
|
||
blk < (grub_be_to_cpu64 (dir->inode.size)
|
||
>> dirblk_log2);
|
||
blk++)
|
||
{
|
||
/* The header is skipped, the first direntry is stored
|
||
from byte 16. */
|
||
int pos = 16;
|
||
int entries;
|
||
int tail_start = (dirblk_size
|
||
- sizeof (struct grub_xfs_dirblock_tail));
|
||
|
||
struct grub_xfs_dirblock_tail *tail;
|
||
tail = (struct grub_xfs_dirblock_tail *) &dirblock[tail_start];
|
||
|
||
numread = grub_xfs_read_file (dir, 0,
|
||
blk << dirblk_log2,
|
||
dirblk_size, dirblock);
|
||
if (numread != dirblk_size)
|
||
return 0;
|
||
|
||
entries = (grub_be_to_cpu32 (tail->leaf_count)
|
||
- grub_be_to_cpu32 (tail->leaf_stale));
|
||
|
||
/* Iterate over all entries within this block. */
|
||
while (pos < (dirblk_size
|
||
- (int) sizeof (struct grub_xfs_dir2_entry)))
|
||
{
|
||
struct grub_xfs_dir2_entry *direntry;
|
||
grub_uint8_t *freetag;
|
||
char *filename;
|
||
|
||
direntry = (struct grub_xfs_dir2_entry *) &dirblock[pos];
|
||
freetag = (grub_uint8_t *) direntry;
|
||
|
||
if (grub_get_unaligned16 (freetag) == 0XFFFF)
|
||
{
|
||
grub_uint8_t *skip = (freetag + sizeof (grub_uint16_t));
|
||
|
||
/* This entry is not used, go to the next one. */
|
||
pos += grub_be_to_cpu16 (grub_get_unaligned16 (skip));
|
||
|
||
continue;
|
||
}
|
||
|
||
filename = &dirblock[pos + sizeof (*direntry)];
|
||
/* The byte after the filename is for the tag, which
|
||
is not used by GRUB. So it can be overwritten. */
|
||
filename[direntry->len] = '\0';
|
||
|
||
if (call_hook (direntry->inode, filename))
|
||
{
|
||
grub_free (dirblock);
|
||
return 1;
|
||
}
|
||
|
||
/* Check if last direntry in this block is
|
||
reached. */
|
||
entries--;
|
||
if (!entries)
|
||
break;
|
||
|
||
/* Select the next directory entry. */
|
||
pos = GRUB_XFS_NEXT_DIRENT (pos, direntry->len);
|
||
pos = GRUB_XFS_ROUND_TO_DIRENT (pos);
|
||
}
|
||
}
|
||
grub_free (dirblock);
|
||
break;
|
||
}
|
||
|
||
default:
|
||
grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET,
|
||
"XFS does not support inode format %d yet",
|
||
diro->inode.format);
|
||
}
|
||
return 0;
|
||
}
|
||
|
||
|
||
static struct grub_xfs_data *
|
||
grub_xfs_mount (grub_disk_t disk)
|
||
{
|
||
struct grub_xfs_data *data = 0;
|
||
|
||
data = grub_zalloc (sizeof (struct grub_xfs_data));
|
||
if (!data)
|
||
return 0;
|
||
|
||
/* Read the superblock. */
|
||
if (grub_disk_read (disk, 0, 0,
|
||
sizeof (struct grub_xfs_sblock), &data->sblock))
|
||
goto fail;
|
||
|
||
if (grub_strncmp ((char *) (data->sblock.magic), "XFSB", 4))
|
||
{
|
||
grub_error (GRUB_ERR_BAD_FS, "not a XFS filesystem");
|
||
goto fail;
|
||
}
|
||
|
||
data = grub_realloc (data,
|
||
sizeof (struct grub_xfs_data)
|
||
- sizeof (struct grub_xfs_inode)
|
||
+ (1 << data->sblock.log2_inode));
|
||
|
||
if (! data)
|
||
goto fail;
|
||
|
||
data->diropen.data = data;
|
||
data->diropen.ino = data->sblock.rootino;
|
||
data->diropen.inode_read = 1;
|
||
data->bsize = grub_be_to_cpu32 (data->sblock.bsize);
|
||
data->agsize = grub_be_to_cpu32 (data->sblock.agsize);
|
||
|
||
data->disk = disk;
|
||
data->pos = 0;
|
||
|
||
grub_xfs_read_inode (data, data->diropen.ino, &data->diropen.inode);
|
||
|
||
return data;
|
||
fail:
|
||
|
||
if (grub_errno == GRUB_ERR_OUT_OF_RANGE)
|
||
grub_error (GRUB_ERR_BAD_FS, "not an XFS filesystem");
|
||
|
||
grub_free (data);
|
||
|
||
return 0;
|
||
}
|
||
|
||
|
||
static grub_err_t
|
||
grub_xfs_dir (grub_device_t device, const char *path,
|
||
int (*hook) (const char *filename,
|
||
const struct grub_dirhook_info *info))
|
||
{
|
||
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)
|
||
{
|
||
struct grub_dirhook_info info;
|
||
grub_memset (&info, 0, sizeof (info));
|
||
if (node->inode_read)
|
||
{
|
||
info.mtimeset = 1;
|
||
info.mtime = grub_be_to_cpu32 (node->inode.mtime.sec);
|
||
}
|
||
info.dir = ((filetype & GRUB_FSHELP_TYPE_MASK) == GRUB_FSHELP_DIR);
|
||
grub_free (node);
|
||
return hook (filename, &info);
|
||
}
|
||
|
||
grub_dl_ref (my_mod);
|
||
|
||
data = grub_xfs_mount (device->disk);
|
||
if (!data)
|
||
goto mount_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);
|
||
|
||
mount_fail:
|
||
|
||
grub_dl_unref (my_mod);
|
||
|
||
return grub_errno;
|
||
}
|
||
|
||
|
||
/* 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;
|
||
|
||
grub_dl_ref (my_mod);
|
||
|
||
data = grub_xfs_mount (file->device->disk);
|
||
if (!data)
|
||
goto mount_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;
|
||
}
|
||
|
||
if (fdiro != &data->diropen)
|
||
{
|
||
grub_memcpy (&data->diropen, fdiro,
|
||
sizeof (struct grub_fshelp_node)
|
||
- sizeof (struct grub_xfs_inode)
|
||
+ (1 << data->sblock.log2_inode));
|
||
grub_free (fdiro);
|
||
}
|
||
|
||
file->size = grub_be_to_cpu64 (data->diropen.inode.size);
|
||
file->data = data;
|
||
file->offset = 0;
|
||
|
||
return 0;
|
||
|
||
fail:
|
||
if (fdiro != &data->diropen)
|
||
grub_free (fdiro);
|
||
grub_free (data);
|
||
|
||
mount_fail:
|
||
grub_dl_unref (my_mod);
|
||
|
||
return grub_errno;
|
||
}
|
||
|
||
|
||
static grub_ssize_t
|
||
grub_xfs_read (grub_file_t file, char *buf, grub_size_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);
|
||
|
||
grub_dl_unref (my_mod);
|
||
|
||
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;
|
||
|
||
grub_dl_ref (my_mod);
|
||
|
||
data = grub_xfs_mount (disk);
|
||
if (data)
|
||
*label = grub_strndup ((char *) (data->sblock.label), 12);
|
||
else
|
||
*label = 0;
|
||
|
||
grub_dl_unref (my_mod);
|
||
|
||
grub_free (data);
|
||
|
||
return grub_errno;
|
||
}
|
||
|
||
static grub_err_t
|
||
grub_xfs_uuid (grub_device_t device, char **uuid)
|
||
{
|
||
struct grub_xfs_data *data;
|
||
grub_disk_t disk = device->disk;
|
||
|
||
grub_dl_ref (my_mod);
|
||
|
||
data = grub_xfs_mount (disk);
|
||
if (data)
|
||
{
|
||
*uuid = grub_xasprintf ("%04x%04x-%04x-%04x-%04x-%04x%04x%04x",
|
||
grub_be_to_cpu16 (data->sblock.uuid[0]),
|
||
grub_be_to_cpu16 (data->sblock.uuid[1]),
|
||
grub_be_to_cpu16 (data->sblock.uuid[2]),
|
||
grub_be_to_cpu16 (data->sblock.uuid[3]),
|
||
grub_be_to_cpu16 (data->sblock.uuid[4]),
|
||
grub_be_to_cpu16 (data->sblock.uuid[5]),
|
||
grub_be_to_cpu16 (data->sblock.uuid[6]),
|
||
grub_be_to_cpu16 (data->sblock.uuid[7]));
|
||
}
|
||
else
|
||
*uuid = NULL;
|
||
|
||
grub_dl_unref (my_mod);
|
||
|
||
grub_free (data);
|
||
|
||
return grub_errno;
|
||
}
|
||
|
||
|
||
|
||
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,
|
||
.uuid = grub_xfs_uuid,
|
||
#ifdef GRUB_UTIL
|
||
.reserved_first_sector = 0,
|
||
#endif
|
||
.next = 0
|
||
};
|
||
|
||
GRUB_MOD_INIT(xfs)
|
||
{
|
||
grub_fs_register (&grub_xfs_fs);
|
||
my_mod = mod;
|
||
}
|
||
|
||
GRUB_MOD_FINI(xfs)
|
||
{
|
||
grub_fs_unregister (&grub_xfs_fs);
|
||
}
|