1223 lines
30 KiB
C
1223 lines
30 KiB
C
/*
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* nilfs2.c - New Implementation of Log filesystem
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*
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* Written by Jiro SEKIBA <jir@unicus.jp>
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*
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* Copyright (C) 2003,2004,2005,2007,2008,2010 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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/* 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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#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 NILFS_INODE_BMAP_SIZE 7
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#define NILFS_SUPORT_REV 2
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/* Magic value used to identify an nilfs2 filesystem. */
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#define NILFS2_SUPER_MAGIC 0x3434
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/* nilfs btree node flag. */
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#define NILFS_BTREE_NODE_ROOT 0x01
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/* nilfs btree node level. */
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#define NILFS_BTREE_LEVEL_DATA 0
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#define NILFS_BTREE_LEVEL_NODE_MIN (NILFS_BTREE_LEVEL_DATA + 1)
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/* nilfs 1st super block posission from beginning of the partition
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in 512 block size */
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#define NILFS_1ST_SUPER_BLOCK 2
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/* nilfs 2nd super block posission from beginning of the partition
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in 512 block size */
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#define NILFS_2ND_SUPER_BLOCK(devsize) (((devsize >> 3) - 1) << 3)
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#define LOG_INODE_SIZE 7
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struct grub_nilfs2_inode
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{
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grub_uint64_t i_blocks;
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grub_uint64_t i_size;
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grub_uint64_t i_ctime;
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grub_uint64_t i_mtime;
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grub_uint32_t i_ctime_nsec;
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grub_uint32_t i_mtime_nsec;
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grub_uint32_t i_uid;
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grub_uint32_t i_gid;
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grub_uint16_t i_mode;
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grub_uint16_t i_links_count;
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grub_uint32_t i_flags;
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grub_uint64_t i_bmap[NILFS_INODE_BMAP_SIZE];
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#define i_device_code i_bmap[0]
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grub_uint64_t i_xattr;
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grub_uint32_t i_generation;
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grub_uint32_t i_pad;
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};
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struct grub_nilfs2_super_root
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{
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grub_uint32_t sr_sum;
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grub_uint16_t sr_bytes;
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grub_uint16_t sr_flags;
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grub_uint64_t sr_nongc_ctime;
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struct grub_nilfs2_inode sr_dat;
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struct grub_nilfs2_inode sr_cpfile;
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struct grub_nilfs2_inode sr_sufile;
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};
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struct grub_nilfs2_super_block
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{
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grub_uint32_t s_rev_level;
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grub_uint16_t s_minor_rev_level;
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grub_uint16_t s_magic;
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grub_uint16_t s_bytes;
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grub_uint16_t s_flags;
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grub_uint32_t s_crc_seed;
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grub_uint32_t s_sum;
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grub_uint32_t s_log_block_size;
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grub_uint64_t s_nsegments;
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grub_uint64_t s_dev_size;
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grub_uint64_t s_first_data_block;
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grub_uint32_t s_blocks_per_segment;
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grub_uint32_t s_r_segments_percentage;
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grub_uint64_t s_last_cno;
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grub_uint64_t s_last_pseg;
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grub_uint64_t s_last_seq;
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grub_uint64_t s_free_blocks_count;
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grub_uint64_t s_ctime;
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grub_uint64_t s_mtime;
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grub_uint64_t s_wtime;
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grub_uint16_t s_mnt_count;
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grub_uint16_t s_max_mnt_count;
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grub_uint16_t s_state;
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grub_uint16_t s_errors;
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grub_uint64_t s_lastcheck;
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grub_uint32_t s_checkinterval;
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grub_uint32_t s_creator_os;
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grub_uint16_t s_def_resuid;
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grub_uint16_t s_def_resgid;
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grub_uint32_t s_first_ino;
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grub_uint16_t s_inode_size;
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grub_uint16_t s_dat_entry_size;
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grub_uint16_t s_checkpoint_size;
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grub_uint16_t s_segment_usage_size;
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grub_uint8_t s_uuid[16];
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char s_volume_name[80];
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grub_uint32_t s_c_interval;
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grub_uint32_t s_c_block_max;
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grub_uint32_t s_reserved[192];
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};
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struct grub_nilfs2_dir_entry
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{
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grub_uint64_t inode;
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grub_uint16_t rec_len;
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#define MAX_NAMELEN 255
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grub_uint8_t name_len;
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grub_uint8_t file_type;
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#if 0 /* followed by file name. */
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char name[NILFS_NAME_LEN];
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char pad;
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#endif
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} GRUB_PACKED;
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enum
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{
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NILFS_FT_UNKNOWN,
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NILFS_FT_REG_FILE,
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NILFS_FT_DIR,
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NILFS_FT_CHRDEV,
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NILFS_FT_BLKDEV,
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NILFS_FT_FIFO,
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NILFS_FT_SOCK,
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NILFS_FT_SYMLINK,
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NILFS_FT_MAX
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};
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struct grub_nilfs2_finfo
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{
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grub_uint64_t fi_ino;
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grub_uint64_t fi_cno;
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grub_uint32_t fi_nblocks;
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grub_uint32_t fi_ndatablk;
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};
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struct grub_nilfs2_binfo_v
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{
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grub_uint64_t bi_vblocknr;
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grub_uint64_t bi_blkoff;
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};
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struct grub_nilfs2_binfo_dat
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{
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grub_uint64_t bi_blkoff;
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grub_uint8_t bi_level;
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grub_uint8_t bi_pad[7];
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};
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union grub_nilfs2_binfo
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{
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struct grub_nilfs2_binfo_v bi_v;
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struct grub_nilfs2_binfo_dat bi_dat;
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};
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struct grub_nilfs2_segment_summary
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{
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grub_uint32_t ss_datasum;
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grub_uint32_t ss_sumsum;
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grub_uint32_t ss_magic;
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grub_uint16_t ss_bytes;
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grub_uint16_t ss_flags;
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grub_uint64_t ss_seq;
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grub_uint64_t ss_create;
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grub_uint64_t ss_next;
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grub_uint32_t ss_nblocks;
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grub_uint32_t ss_nfinfo;
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grub_uint32_t ss_sumbytes;
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grub_uint32_t ss_pad;
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};
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struct grub_nilfs2_btree_node
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{
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grub_uint8_t bn_flags;
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grub_uint8_t bn_level;
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grub_uint16_t bn_nchildren;
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grub_uint32_t bn_pad;
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grub_uint64_t keys[0];
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};
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struct grub_nilfs2_palloc_group_desc
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{
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grub_uint32_t pg_nfrees;
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};
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#define LOG_SIZE_GROUP_DESC 2
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#define LOG_NILFS_DAT_ENTRY_SIZE 5
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struct grub_nilfs2_dat_entry
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{
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grub_uint64_t de_blocknr;
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grub_uint64_t de_start;
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grub_uint64_t de_end;
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grub_uint64_t de_rsv;
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};
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struct grub_nilfs2_snapshot_list
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{
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grub_uint64_t ssl_next;
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grub_uint64_t ssl_prev;
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};
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struct grub_nilfs2_cpfile_header
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{
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grub_uint64_t ch_ncheckpoints;
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grub_uint64_t ch_nsnapshots;
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struct grub_nilfs2_snapshot_list ch_snapshot_list;
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};
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struct grub_nilfs2_checkpoint
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{
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grub_uint32_t cp_flags;
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grub_uint32_t cp_checkpoints_count;
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struct grub_nilfs2_snapshot_list cp_snapshot_list;
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grub_uint64_t cp_cno;
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grub_uint64_t cp_create;
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grub_uint64_t cp_nblk_inc;
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grub_uint64_t cp_inodes_count;
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grub_uint64_t cp_blocks_count;
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struct grub_nilfs2_inode cp_ifile_inode;
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};
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#define NILFS_BMAP_LARGE 0x1
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#define NILFS_BMAP_SIZE (NILFS_INODE_BMAP_SIZE * sizeof(grub_uint64_t))
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/* nilfs extra padding for nonroot btree node. */
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#define NILFS_BTREE_NODE_EXTRA_PAD_SIZE (sizeof(grub_uint64_t))
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#define NILFS_BTREE_ROOT_SIZE NILFS_BMAP_SIZE
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#define NILFS_BTREE_ROOT_NCHILDREN_MAX \
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((NILFS_BTREE_ROOT_SIZE - sizeof(struct nilfs_btree_node)) / \
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(sizeof(grub_uint64_t) + sizeof(grub_uint64_t)) )
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struct grub_fshelp_node
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{
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struct grub_nilfs2_data *data;
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struct grub_nilfs2_inode inode;
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grub_uint64_t ino;
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int inode_read;
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};
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struct grub_nilfs2_data
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{
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struct grub_nilfs2_super_block sblock;
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struct grub_nilfs2_super_root sroot;
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struct grub_nilfs2_inode ifile;
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grub_disk_t disk;
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struct grub_nilfs2_inode *inode;
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struct grub_fshelp_node diropen;
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};
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/* Log2 size of nilfs2 block in 512 blocks. */
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#define LOG2_NILFS2_BLOCK_SIZE(data) \
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(grub_le_to_cpu32 (data->sblock.s_log_block_size) + 1)
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/* Log2 size of nilfs2 block in bytes. */
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#define LOG2_BLOCK_SIZE(data) \
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(grub_le_to_cpu32 (data->sblock.s_log_block_size) + 10)
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/* The size of an nilfs2 block in bytes. */
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#define NILFS2_BLOCK_SIZE(data) (1 << LOG2_BLOCK_SIZE (data))
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static grub_uint64_t
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grub_nilfs2_dat_translate (struct grub_nilfs2_data *data, grub_uint64_t key);
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static grub_dl_t my_mod;
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static inline unsigned long
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grub_nilfs2_log_palloc_entries_per_group (struct grub_nilfs2_data *data)
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{
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return LOG2_BLOCK_SIZE (data) + 3;
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}
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static inline grub_uint64_t
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grub_nilfs2_palloc_group (struct grub_nilfs2_data *data,
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grub_uint64_t nr, grub_uint64_t * offset)
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{
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*offset = nr & ((1 << grub_nilfs2_log_palloc_entries_per_group (data)) - 1);
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return nr >> grub_nilfs2_log_palloc_entries_per_group (data);
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}
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static inline grub_uint32_t
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grub_nilfs2_palloc_log_groups_per_desc_block (struct grub_nilfs2_data *data)
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{
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return LOG2_BLOCK_SIZE (data) - LOG_SIZE_GROUP_DESC;
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COMPILE_TIME_ASSERT (sizeof (struct grub_nilfs2_palloc_group_desc)
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== (1 << LOG_SIZE_GROUP_DESC));
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}
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static inline grub_uint32_t
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grub_nilfs2_log_entries_per_block_log (struct grub_nilfs2_data *data,
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unsigned long log_entry_size)
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{
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return LOG2_BLOCK_SIZE (data) - log_entry_size;
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}
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static inline grub_uint32_t
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grub_nilfs2_blocks_per_group_log (struct grub_nilfs2_data *data,
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unsigned long log_entry_size)
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{
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return (1 << (grub_nilfs2_log_palloc_entries_per_group (data)
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- grub_nilfs2_log_entries_per_block_log (data,
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log_entry_size))) + 1;
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}
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static inline grub_uint32_t
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grub_nilfs2_blocks_per_desc_block_log (struct grub_nilfs2_data *data,
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unsigned long log_entry_size)
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{
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return(grub_nilfs2_blocks_per_group_log (data, log_entry_size)
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<< grub_nilfs2_palloc_log_groups_per_desc_block (data)) + 1;
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}
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static inline grub_uint32_t
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grub_nilfs2_palloc_desc_block_offset_log (struct grub_nilfs2_data *data,
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unsigned long group,
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unsigned long log_entry_size)
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{
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grub_uint32_t desc_block =
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group >> grub_nilfs2_palloc_log_groups_per_desc_block (data);
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return desc_block * grub_nilfs2_blocks_per_desc_block_log (data,
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log_entry_size);
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}
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static inline grub_uint32_t
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grub_nilfs2_palloc_bitmap_block_offset (struct grub_nilfs2_data *data,
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unsigned long group,
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unsigned long log_entry_size)
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{
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unsigned long desc_offset = group
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& ((1 << grub_nilfs2_palloc_log_groups_per_desc_block (data)) - 1);
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return grub_nilfs2_palloc_desc_block_offset_log (data, group, log_entry_size)
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+ 1
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+ desc_offset * grub_nilfs2_blocks_per_group_log (data, log_entry_size);
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}
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static inline grub_uint32_t
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grub_nilfs2_palloc_entry_offset_log (struct grub_nilfs2_data *data,
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grub_uint64_t nr,
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unsigned long log_entry_size)
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{
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unsigned long group;
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grub_uint64_t group_offset;
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group = grub_nilfs2_palloc_group (data, nr, &group_offset);
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return grub_nilfs2_palloc_bitmap_block_offset (data, group,
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log_entry_size) + 1 +
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(group_offset >> grub_nilfs2_log_entries_per_block_log (data,
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log_entry_size));
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}
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static inline struct grub_nilfs2_btree_node *
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grub_nilfs2_btree_get_root (struct grub_nilfs2_inode *inode)
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{
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return (struct grub_nilfs2_btree_node *) &inode->i_bmap[0];
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}
|
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|
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static inline int
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grub_nilfs2_btree_get_level (struct grub_nilfs2_btree_node *node)
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{
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return node->bn_level;
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}
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static inline grub_uint64_t *
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grub_nilfs2_btree_node_dkeys (struct grub_nilfs2_btree_node *node)
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{
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return (node->keys +
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((node->bn_flags & NILFS_BTREE_NODE_ROOT) ?
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0 : (NILFS_BTREE_NODE_EXTRA_PAD_SIZE / sizeof (grub_uint64_t))));
|
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}
|
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|
||
static inline grub_uint64_t
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grub_nilfs2_btree_node_get_key (struct grub_nilfs2_btree_node *node,
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int index)
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{
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return grub_le_to_cpu64 (*(grub_nilfs2_btree_node_dkeys (node) + index));
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}
|
||
|
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static inline int
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grub_nilfs2_btree_node_lookup (struct grub_nilfs2_btree_node *node,
|
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grub_uint64_t key, int *indexp)
|
||
{
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grub_uint64_t nkey;
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int index, low, high, s;
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low = 0;
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high = grub_le_to_cpu16 (node->bn_nchildren) - 1;
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index = 0;
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s = 0;
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while (low <= high)
|
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{
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index = (low + high) / 2;
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nkey = grub_nilfs2_btree_node_get_key (node, index);
|
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if (nkey == key)
|
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{
|
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*indexp = index;
|
||
return 1;
|
||
}
|
||
else if (nkey < key)
|
||
{
|
||
low = index + 1;
|
||
s = -1;
|
||
}
|
||
else
|
||
{
|
||
high = index - 1;
|
||
s = 1;
|
||
}
|
||
}
|
||
|
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if (node->bn_level > NILFS_BTREE_LEVEL_NODE_MIN)
|
||
{
|
||
if (s > 0 && index > 0)
|
||
index--;
|
||
}
|
||
else if (s < 0)
|
||
index++;
|
||
|
||
*indexp = index;
|
||
return s == 0;
|
||
}
|
||
|
||
static inline int
|
||
grub_nilfs2_btree_node_nchildren_max (struct grub_nilfs2_data *data,
|
||
struct grub_nilfs2_btree_node *node)
|
||
{
|
||
int node_children_max = ((NILFS2_BLOCK_SIZE (data) -
|
||
sizeof (struct grub_nilfs2_btree_node) -
|
||
NILFS_BTREE_NODE_EXTRA_PAD_SIZE) /
|
||
(sizeof (grub_uint64_t) + sizeof (grub_uint64_t)));
|
||
|
||
return (node->bn_flags & NILFS_BTREE_NODE_ROOT) ? 3 : node_children_max;
|
||
}
|
||
|
||
static inline grub_uint64_t *
|
||
grub_nilfs2_btree_node_dptrs (struct grub_nilfs2_data *data,
|
||
struct grub_nilfs2_btree_node *node)
|
||
{
|
||
return (grub_uint64_t *) (grub_nilfs2_btree_node_dkeys (node) +
|
||
grub_nilfs2_btree_node_nchildren_max (data,
|
||
node));
|
||
}
|
||
|
||
static inline grub_uint64_t
|
||
grub_nilfs2_btree_node_get_ptr (struct grub_nilfs2_data *data,
|
||
struct grub_nilfs2_btree_node *node,
|
||
int index)
|
||
{
|
||
return
|
||
grub_le_to_cpu64 (*(grub_nilfs2_btree_node_dptrs (data, node) + index));
|
||
}
|
||
|
||
static inline int
|
||
grub_nilfs2_btree_get_nonroot_node (struct grub_nilfs2_data *data,
|
||
grub_uint64_t ptr, void *block)
|
||
{
|
||
grub_disk_t disk = data->disk;
|
||
unsigned int nilfs2_block_count = (1 << LOG2_NILFS2_BLOCK_SIZE (data));
|
||
|
||
return grub_disk_read (disk, ptr * nilfs2_block_count, 0,
|
||
NILFS2_BLOCK_SIZE (data), block);
|
||
}
|
||
|
||
static grub_uint64_t
|
||
grub_nilfs2_btree_lookup (struct grub_nilfs2_data *data,
|
||
struct grub_nilfs2_inode *inode,
|
||
grub_uint64_t key, int need_translate)
|
||
{
|
||
struct grub_nilfs2_btree_node *node;
|
||
void *block;
|
||
grub_uint64_t ptr;
|
||
int level, found = 0, index;
|
||
|
||
block = grub_malloc (NILFS2_BLOCK_SIZE (data));
|
||
if (!block)
|
||
return -1;
|
||
|
||
node = grub_nilfs2_btree_get_root (inode);
|
||
level = grub_nilfs2_btree_get_level (node);
|
||
|
||
found = grub_nilfs2_btree_node_lookup (node, key, &index);
|
||
ptr = grub_nilfs2_btree_node_get_ptr (data, node, index);
|
||
if (need_translate)
|
||
ptr = grub_nilfs2_dat_translate (data, ptr);
|
||
|
||
for (level--; level >= NILFS_BTREE_LEVEL_NODE_MIN; level--)
|
||
{
|
||
grub_nilfs2_btree_get_nonroot_node (data, ptr, block);
|
||
if (grub_errno)
|
||
{
|
||
goto fail;
|
||
}
|
||
node = (struct grub_nilfs2_btree_node *) block;
|
||
|
||
if (node->bn_level != level)
|
||
{
|
||
grub_error (GRUB_ERR_BAD_FS, "btree level mismatch\n");
|
||
goto fail;
|
||
}
|
||
|
||
if (!found)
|
||
found = grub_nilfs2_btree_node_lookup (node, key, &index);
|
||
else
|
||
index = 0;
|
||
|
||
if (index < grub_nilfs2_btree_node_nchildren_max (data, node))
|
||
{
|
||
ptr = grub_nilfs2_btree_node_get_ptr (data, node, index);
|
||
if (need_translate)
|
||
ptr = grub_nilfs2_dat_translate (data, ptr);
|
||
}
|
||
else
|
||
{
|
||
grub_error (GRUB_ERR_BAD_FS, "btree corruption\n");
|
||
goto fail;
|
||
}
|
||
}
|
||
|
||
grub_free (block);
|
||
|
||
if (!found)
|
||
return -1;
|
||
|
||
return ptr;
|
||
fail:
|
||
grub_free (block);
|
||
return -1;
|
||
}
|
||
|
||
static inline grub_uint64_t
|
||
grub_nilfs2_direct_lookup (struct grub_nilfs2_inode *inode, grub_uint64_t key)
|
||
{
|
||
return grub_le_to_cpu64 (inode->i_bmap[1 + key]);
|
||
}
|
||
|
||
static inline grub_uint64_t
|
||
grub_nilfs2_bmap_lookup (struct grub_nilfs2_data *data,
|
||
struct grub_nilfs2_inode *inode,
|
||
grub_uint64_t key, int need_translate)
|
||
{
|
||
struct grub_nilfs2_btree_node *root = grub_nilfs2_btree_get_root (inode);
|
||
if (root->bn_flags & NILFS_BMAP_LARGE)
|
||
return grub_nilfs2_btree_lookup (data, inode, key, need_translate);
|
||
else
|
||
{
|
||
grub_uint64_t ptr;
|
||
ptr = grub_nilfs2_direct_lookup (inode, key);
|
||
if (need_translate)
|
||
ptr = grub_nilfs2_dat_translate (data, ptr);
|
||
return ptr;
|
||
}
|
||
}
|
||
|
||
static grub_uint64_t
|
||
grub_nilfs2_dat_translate (struct grub_nilfs2_data *data, grub_uint64_t key)
|
||
{
|
||
struct grub_nilfs2_dat_entry entry;
|
||
grub_disk_t disk = data->disk;
|
||
grub_uint64_t pptr;
|
||
grub_uint64_t blockno, offset;
|
||
unsigned int nilfs2_block_count = (1 << LOG2_NILFS2_BLOCK_SIZE (data));
|
||
|
||
blockno = grub_nilfs2_palloc_entry_offset_log (data, key,
|
||
LOG_NILFS_DAT_ENTRY_SIZE);
|
||
|
||
offset = ((key * sizeof (struct grub_nilfs2_dat_entry))
|
||
& ((1 << LOG2_BLOCK_SIZE (data)) - 1));
|
||
|
||
pptr = grub_nilfs2_bmap_lookup (data, &data->sroot.sr_dat, blockno, 0);
|
||
if (pptr == (grub_uint64_t) - 1)
|
||
{
|
||
grub_error (GRUB_ERR_BAD_FS, "btree lookup failure");
|
||
return -1;
|
||
}
|
||
|
||
grub_disk_read (disk, pptr * nilfs2_block_count, offset,
|
||
sizeof (struct grub_nilfs2_dat_entry), &entry);
|
||
|
||
return grub_le_to_cpu64 (entry.de_blocknr);
|
||
}
|
||
|
||
|
||
static grub_disk_addr_t
|
||
grub_nilfs2_read_block (grub_fshelp_node_t node, grub_disk_addr_t fileblock)
|
||
{
|
||
struct grub_nilfs2_data *data = node->data;
|
||
struct grub_nilfs2_inode *inode = &node->inode;
|
||
grub_uint64_t pptr = -1;
|
||
|
||
pptr = grub_nilfs2_bmap_lookup (data, inode, fileblock, 1);
|
||
if (pptr == (grub_uint64_t) - 1)
|
||
{
|
||
grub_error (GRUB_ERR_BAD_FS, "btree lookup failure");
|
||
return -1;
|
||
}
|
||
|
||
return pptr;
|
||
}
|
||
|
||
/* Read LEN bytes from the file described by DATA starting with byte
|
||
POS. Return the amount of read bytes in READ. */
|
||
static grub_ssize_t
|
||
grub_nilfs2_read_file (grub_fshelp_node_t node,
|
||
grub_disk_read_hook_t read_hook, void *read_hook_data,
|
||
grub_off_t pos, grub_size_t len, char *buf)
|
||
{
|
||
return grub_fshelp_read_file (node->data->disk, node,
|
||
read_hook, read_hook_data,
|
||
pos, len, buf, grub_nilfs2_read_block,
|
||
grub_le_to_cpu64 (node->inode.i_size),
|
||
LOG2_NILFS2_BLOCK_SIZE (node->data), 0);
|
||
|
||
}
|
||
|
||
static grub_err_t
|
||
grub_nilfs2_read_checkpoint (struct grub_nilfs2_data *data,
|
||
grub_uint64_t cpno,
|
||
struct grub_nilfs2_checkpoint *cpp)
|
||
{
|
||
grub_uint64_t blockno;
|
||
grub_uint64_t offset;
|
||
grub_uint64_t pptr;
|
||
grub_disk_t disk = data->disk;
|
||
unsigned int nilfs2_block_count = (1 << LOG2_NILFS2_BLOCK_SIZE (data));
|
||
|
||
/* Assume sizeof(struct grub_nilfs2_cpfile_header) <
|
||
sizeof(struct grub_nilfs2_checkpoint).
|
||
*/
|
||
blockno = grub_divmod64 (cpno, NILFS2_BLOCK_SIZE (data) /
|
||
sizeof (struct grub_nilfs2_checkpoint), &offset);
|
||
|
||
pptr = grub_nilfs2_bmap_lookup (data, &data->sroot.sr_cpfile, blockno, 1);
|
||
if (pptr == (grub_uint64_t) - 1)
|
||
{
|
||
return grub_error (GRUB_ERR_BAD_FS, "btree lookup failure");
|
||
}
|
||
|
||
return grub_disk_read (disk, pptr * nilfs2_block_count,
|
||
offset * sizeof (struct grub_nilfs2_checkpoint),
|
||
sizeof (struct grub_nilfs2_checkpoint), cpp);
|
||
}
|
||
|
||
static inline grub_err_t
|
||
grub_nilfs2_read_last_checkpoint (struct grub_nilfs2_data *data,
|
||
struct grub_nilfs2_checkpoint *cpp)
|
||
{
|
||
return grub_nilfs2_read_checkpoint (data,
|
||
grub_le_to_cpu64 (data->
|
||
sblock.s_last_cno),
|
||
cpp);
|
||
}
|
||
|
||
/* Read the inode INO for the file described by DATA into INODE. */
|
||
static grub_err_t
|
||
grub_nilfs2_read_inode (struct grub_nilfs2_data *data,
|
||
grub_uint64_t ino, struct grub_nilfs2_inode *inodep)
|
||
{
|
||
grub_uint64_t blockno;
|
||
grub_uint64_t offset;
|
||
grub_uint64_t pptr;
|
||
grub_disk_t disk = data->disk;
|
||
unsigned int nilfs2_block_count = (1 << LOG2_NILFS2_BLOCK_SIZE (data));
|
||
|
||
blockno = grub_nilfs2_palloc_entry_offset_log (data, ino,
|
||
LOG_INODE_SIZE);
|
||
|
||
offset = ((sizeof (struct grub_nilfs2_inode) * ino)
|
||
& ((1 << LOG2_BLOCK_SIZE (data)) - 1));
|
||
pptr = grub_nilfs2_bmap_lookup (data, &data->ifile, blockno, 1);
|
||
if (pptr == (grub_uint64_t) - 1)
|
||
{
|
||
return grub_error (GRUB_ERR_BAD_FS, "btree lookup failure");
|
||
}
|
||
|
||
return grub_disk_read (disk, pptr * nilfs2_block_count, offset,
|
||
sizeof (struct grub_nilfs2_inode), inodep);
|
||
}
|
||
|
||
static int
|
||
grub_nilfs2_valid_sb (struct grub_nilfs2_super_block *sbp)
|
||
{
|
||
if (grub_le_to_cpu16 (sbp->s_magic) != NILFS2_SUPER_MAGIC)
|
||
return 0;
|
||
|
||
if (grub_le_to_cpu32 (sbp->s_rev_level) != NILFS_SUPORT_REV)
|
||
return 0;
|
||
|
||
/* 20 already means 1GiB blocks. We don't want to deal with blocks overflowing int32. */
|
||
if (grub_le_to_cpu32 (sbp->s_log_block_size) > 20)
|
||
return 0;
|
||
|
||
return 1;
|
||
}
|
||
|
||
static grub_err_t
|
||
grub_nilfs2_load_sb (struct grub_nilfs2_data *data)
|
||
{
|
||
grub_disk_t disk = data->disk;
|
||
struct grub_nilfs2_super_block sb2;
|
||
grub_uint64_t partition_size;
|
||
int valid[2];
|
||
int swp = 0;
|
||
grub_err_t err;
|
||
|
||
/* Read first super block. */
|
||
err = grub_disk_read (disk, NILFS_1ST_SUPER_BLOCK, 0,
|
||
sizeof (struct grub_nilfs2_super_block), &data->sblock);
|
||
if (err)
|
||
return err;
|
||
/* Make sure if 1st super block is valid. */
|
||
valid[0] = grub_nilfs2_valid_sb (&data->sblock);
|
||
|
||
if (valid[0])
|
||
partition_size = (grub_le_to_cpu64 (data->sblock.s_dev_size)
|
||
>> GRUB_DISK_SECTOR_BITS);
|
||
else
|
||
partition_size = grub_disk_get_size (disk);
|
||
if (partition_size != GRUB_DISK_SIZE_UNKNOWN)
|
||
{
|
||
/* Read second super block. */
|
||
err = grub_disk_read (disk, NILFS_2ND_SUPER_BLOCK (partition_size), 0,
|
||
sizeof (struct grub_nilfs2_super_block), &sb2);
|
||
if (err)
|
||
{
|
||
valid[1] = 0;
|
||
grub_errno = GRUB_ERR_NONE;
|
||
}
|
||
else
|
||
/* Make sure if 2nd super block is valid. */
|
||
valid[1] = grub_nilfs2_valid_sb (&sb2);
|
||
}
|
||
else
|
||
/* 2nd super block may not exist, so it's invalid. */
|
||
valid[1] = 0;
|
||
|
||
if (!valid[0] && !valid[1])
|
||
return grub_error (GRUB_ERR_BAD_FS, "not a nilfs2 filesystem");
|
||
|
||
swp = valid[1] && (!valid[0] ||
|
||
grub_le_to_cpu64 (data->sblock.s_last_cno) <
|
||
grub_le_to_cpu64 (sb2.s_last_cno));
|
||
|
||
/* swap if first super block is invalid or older than second one. */
|
||
if (swp)
|
||
grub_memcpy (&data->sblock, &sb2,
|
||
sizeof (struct grub_nilfs2_super_block));
|
||
|
||
return GRUB_ERR_NONE;
|
||
}
|
||
|
||
static struct grub_nilfs2_data *
|
||
grub_nilfs2_mount (grub_disk_t disk)
|
||
{
|
||
struct grub_nilfs2_data *data;
|
||
struct grub_nilfs2_segment_summary ss;
|
||
struct grub_nilfs2_checkpoint last_checkpoint;
|
||
grub_uint64_t last_pseg;
|
||
grub_uint32_t nblocks;
|
||
unsigned int nilfs2_block_count;
|
||
|
||
data = grub_malloc (sizeof (struct grub_nilfs2_data));
|
||
if (!data)
|
||
return 0;
|
||
|
||
data->disk = disk;
|
||
|
||
/* Read the superblock. */
|
||
grub_nilfs2_load_sb (data);
|
||
if (grub_errno)
|
||
goto fail;
|
||
|
||
nilfs2_block_count = (1 << LOG2_NILFS2_BLOCK_SIZE (data));
|
||
|
||
/* Read the last segment summary. */
|
||
last_pseg = grub_le_to_cpu64 (data->sblock.s_last_pseg);
|
||
grub_disk_read (disk, last_pseg * nilfs2_block_count, 0,
|
||
sizeof (struct grub_nilfs2_segment_summary), &ss);
|
||
|
||
if (grub_errno)
|
||
goto fail;
|
||
|
||
/* Read the super root block. */
|
||
nblocks = grub_le_to_cpu32 (ss.ss_nblocks);
|
||
grub_disk_read (disk, (last_pseg + (nblocks - 1)) * nilfs2_block_count, 0,
|
||
sizeof (struct grub_nilfs2_super_root), &data->sroot);
|
||
|
||
if (grub_errno)
|
||
goto fail;
|
||
|
||
grub_nilfs2_read_last_checkpoint (data, &last_checkpoint);
|
||
|
||
if (grub_errno)
|
||
goto fail;
|
||
|
||
grub_memcpy (&data->ifile, &last_checkpoint.cp_ifile_inode,
|
||
sizeof (struct grub_nilfs2_inode));
|
||
|
||
data->diropen.data = data;
|
||
data->diropen.ino = 2;
|
||
data->diropen.inode_read = 1;
|
||
data->inode = &data->diropen.inode;
|
||
|
||
grub_nilfs2_read_inode (data, 2, data->inode);
|
||
|
||
return data;
|
||
|
||
fail:
|
||
if (grub_errno == GRUB_ERR_OUT_OF_RANGE)
|
||
grub_error (GRUB_ERR_BAD_FS, "not a nilfs2 filesystem");
|
||
|
||
grub_free (data);
|
||
return 0;
|
||
}
|
||
|
||
static char *
|
||
grub_nilfs2_read_symlink (grub_fshelp_node_t node)
|
||
{
|
||
char *symlink;
|
||
struct grub_fshelp_node *diro = node;
|
||
|
||
if (!diro->inode_read)
|
||
{
|
||
grub_nilfs2_read_inode (diro->data, diro->ino, &diro->inode);
|
||
if (grub_errno)
|
||
return 0;
|
||
}
|
||
|
||
symlink = grub_malloc (grub_le_to_cpu64 (diro->inode.i_size) + 1);
|
||
if (!symlink)
|
||
return 0;
|
||
|
||
grub_nilfs2_read_file (diro, 0, 0, 0,
|
||
grub_le_to_cpu64 (diro->inode.i_size), symlink);
|
||
if (grub_errno)
|
||
{
|
||
grub_free (symlink);
|
||
return 0;
|
||
}
|
||
|
||
symlink[grub_le_to_cpu64 (diro->inode.i_size)] = '\0';
|
||
return symlink;
|
||
}
|
||
|
||
static int
|
||
grub_nilfs2_iterate_dir (grub_fshelp_node_t dir,
|
||
grub_fshelp_iterate_dir_hook_t hook, void *hook_data)
|
||
{
|
||
grub_off_t fpos = 0;
|
||
struct grub_fshelp_node *diro = (struct grub_fshelp_node *) dir;
|
||
|
||
if (!diro->inode_read)
|
||
{
|
||
grub_nilfs2_read_inode (diro->data, diro->ino, &diro->inode);
|
||
if (grub_errno)
|
||
return 0;
|
||
}
|
||
|
||
/* Iterate files. */
|
||
while (fpos < grub_le_to_cpu64 (diro->inode.i_size))
|
||
{
|
||
struct grub_nilfs2_dir_entry dirent;
|
||
|
||
grub_nilfs2_read_file (diro, 0, 0, fpos,
|
||
sizeof (struct grub_nilfs2_dir_entry),
|
||
(char *) &dirent);
|
||
if (grub_errno)
|
||
return 0;
|
||
|
||
if (dirent.rec_len == 0)
|
||
return 0;
|
||
|
||
if (dirent.name_len != 0)
|
||
{
|
||
char filename[MAX_NAMELEN + 1];
|
||
struct grub_fshelp_node *fdiro;
|
||
enum grub_fshelp_filetype type = GRUB_FSHELP_UNKNOWN;
|
||
|
||
grub_nilfs2_read_file (diro, 0, 0,
|
||
fpos + sizeof (struct grub_nilfs2_dir_entry),
|
||
dirent.name_len, filename);
|
||
if (grub_errno)
|
||
return 0;
|
||
|
||
fdiro = grub_malloc (sizeof (struct grub_fshelp_node));
|
||
if (!fdiro)
|
||
return 0;
|
||
|
||
fdiro->data = diro->data;
|
||
fdiro->ino = grub_le_to_cpu64 (dirent.inode);
|
||
|
||
filename[dirent.name_len] = '\0';
|
||
|
||
if (dirent.file_type != NILFS_FT_UNKNOWN)
|
||
{
|
||
fdiro->inode_read = 0;
|
||
|
||
if (dirent.file_type == NILFS_FT_DIR)
|
||
type = GRUB_FSHELP_DIR;
|
||
else if (dirent.file_type == NILFS_FT_SYMLINK)
|
||
type = GRUB_FSHELP_SYMLINK;
|
||
else if (dirent.file_type == NILFS_FT_REG_FILE)
|
||
type = GRUB_FSHELP_REG;
|
||
}
|
||
else
|
||
{
|
||
/* The filetype can not be read from the dirent, read
|
||
the inode to get more information. */
|
||
grub_nilfs2_read_inode (diro->data,
|
||
grub_le_to_cpu64 (dirent.inode),
|
||
&fdiro->inode);
|
||
if (grub_errno)
|
||
{
|
||
grub_free (fdiro);
|
||
return 0;
|
||
}
|
||
|
||
fdiro->inode_read = 1;
|
||
|
||
if ((grub_le_to_cpu16 (fdiro->inode.i_mode)
|
||
& FILETYPE_INO_MASK) == FILETYPE_INO_DIRECTORY)
|
||
type = GRUB_FSHELP_DIR;
|
||
else if ((grub_le_to_cpu16 (fdiro->inode.i_mode)
|
||
& FILETYPE_INO_MASK) == FILETYPE_INO_SYMLINK)
|
||
type = GRUB_FSHELP_SYMLINK;
|
||
else if ((grub_le_to_cpu16 (fdiro->inode.i_mode)
|
||
& FILETYPE_INO_MASK) == FILETYPE_INO_REG)
|
||
type = GRUB_FSHELP_REG;
|
||
}
|
||
|
||
if (hook (filename, type, fdiro, hook_data))
|
||
return 1;
|
||
}
|
||
|
||
fpos += grub_le_to_cpu16 (dirent.rec_len);
|
||
}
|
||
|
||
return 0;
|
||
}
|
||
|
||
/* Open a file named NAME and initialize FILE. */
|
||
static grub_err_t
|
||
grub_nilfs2_open (struct grub_file *file, const char *name)
|
||
{
|
||
struct grub_nilfs2_data *data = NULL;
|
||
struct grub_fshelp_node *fdiro = 0;
|
||
|
||
grub_dl_ref (my_mod);
|
||
|
||
data = grub_nilfs2_mount (file->device->disk);
|
||
if (!data)
|
||
goto fail;
|
||
|
||
grub_fshelp_find_file (name, &data->diropen, &fdiro,
|
||
grub_nilfs2_iterate_dir, grub_nilfs2_read_symlink,
|
||
GRUB_FSHELP_REG);
|
||
if (grub_errno)
|
||
goto fail;
|
||
|
||
if (!fdiro->inode_read)
|
||
{
|
||
grub_nilfs2_read_inode (data, fdiro->ino, &fdiro->inode);
|
||
if (grub_errno)
|
||
goto fail;
|
||
}
|
||
|
||
grub_memcpy (data->inode, &fdiro->inode, sizeof (struct grub_nilfs2_inode));
|
||
grub_free (fdiro);
|
||
|
||
file->size = grub_le_to_cpu64 (data->inode->i_size);
|
||
file->data = data;
|
||
file->offset = 0;
|
||
|
||
return 0;
|
||
|
||
fail:
|
||
if (fdiro != &data->diropen)
|
||
grub_free (fdiro);
|
||
grub_free (data);
|
||
|
||
grub_dl_unref (my_mod);
|
||
|
||
return grub_errno;
|
||
}
|
||
|
||
static grub_err_t
|
||
grub_nilfs2_close (grub_file_t file)
|
||
{
|
||
grub_free (file->data);
|
||
|
||
grub_dl_unref (my_mod);
|
||
|
||
return GRUB_ERR_NONE;
|
||
}
|
||
|
||
/* Read LEN bytes data from FILE into BUF. */
|
||
static grub_ssize_t
|
||
grub_nilfs2_read (grub_file_t file, char *buf, grub_size_t len)
|
||
{
|
||
struct grub_nilfs2_data *data = (struct grub_nilfs2_data *) file->data;
|
||
|
||
return grub_nilfs2_read_file (&data->diropen,
|
||
file->read_hook, file->read_hook_data,
|
||
file->offset, len, buf);
|
||
}
|
||
|
||
/* Context for grub_nilfs2_dir. */
|
||
struct grub_nilfs2_dir_ctx
|
||
{
|
||
grub_fs_dir_hook_t hook;
|
||
void *hook_data;
|
||
struct grub_nilfs2_data *data;
|
||
};
|
||
|
||
/* Helper for grub_nilfs2_dir. */
|
||
static int
|
||
grub_nilfs2_dir_iter (const char *filename, enum grub_fshelp_filetype filetype,
|
||
grub_fshelp_node_t node, void *data)
|
||
{
|
||
struct grub_nilfs2_dir_ctx *ctx = data;
|
||
struct grub_dirhook_info info;
|
||
|
||
grub_memset (&info, 0, sizeof (info));
|
||
if (!node->inode_read)
|
||
{
|
||
grub_nilfs2_read_inode (ctx->data, node->ino, &node->inode);
|
||
if (!grub_errno)
|
||
node->inode_read = 1;
|
||
grub_errno = GRUB_ERR_NONE;
|
||
}
|
||
if (node->inode_read)
|
||
{
|
||
info.mtimeset = 1;
|
||
info.mtime = grub_le_to_cpu64 (node->inode.i_mtime);
|
||
}
|
||
|
||
info.dir = ((filetype & GRUB_FSHELP_TYPE_MASK) == GRUB_FSHELP_DIR);
|
||
grub_free (node);
|
||
return ctx->hook (filename, &info, ctx->hook_data);
|
||
}
|
||
|
||
static grub_err_t
|
||
grub_nilfs2_dir (grub_device_t device, const char *path,
|
||
grub_fs_dir_hook_t hook, void *hook_data)
|
||
{
|
||
struct grub_nilfs2_dir_ctx ctx = {
|
||
.hook = hook,
|
||
.hook_data = hook_data
|
||
};
|
||
struct grub_fshelp_node *fdiro = 0;
|
||
|
||
grub_dl_ref (my_mod);
|
||
|
||
ctx.data = grub_nilfs2_mount (device->disk);
|
||
if (!ctx.data)
|
||
goto fail;
|
||
|
||
grub_fshelp_find_file (path, &ctx.data->diropen, &fdiro,
|
||
grub_nilfs2_iterate_dir, grub_nilfs2_read_symlink,
|
||
GRUB_FSHELP_DIR);
|
||
if (grub_errno)
|
||
goto fail;
|
||
|
||
grub_nilfs2_iterate_dir (fdiro, grub_nilfs2_dir_iter, &ctx);
|
||
|
||
fail:
|
||
if (fdiro != &ctx.data->diropen)
|
||
grub_free (fdiro);
|
||
grub_free (ctx.data);
|
||
|
||
grub_dl_unref (my_mod);
|
||
|
||
return grub_errno;
|
||
}
|
||
|
||
static grub_err_t
|
||
grub_nilfs2_label (grub_device_t device, char **label)
|
||
{
|
||
struct grub_nilfs2_data *data;
|
||
grub_disk_t disk = device->disk;
|
||
|
||
grub_dl_ref (my_mod);
|
||
|
||
data = grub_nilfs2_mount (disk);
|
||
if (data)
|
||
*label = grub_strndup (data->sblock.s_volume_name,
|
||
sizeof (data->sblock.s_volume_name));
|
||
else
|
||
*label = NULL;
|
||
|
||
grub_dl_unref (my_mod);
|
||
|
||
grub_free (data);
|
||
|
||
return grub_errno;
|
||
}
|
||
|
||
static grub_err_t
|
||
grub_nilfs2_uuid (grub_device_t device, char **uuid)
|
||
{
|
||
struct grub_nilfs2_data *data;
|
||
grub_disk_t disk = device->disk;
|
||
|
||
grub_dl_ref (my_mod);
|
||
|
||
data = grub_nilfs2_mount (disk);
|
||
if (data)
|
||
{
|
||
*uuid =
|
||
grub_xasprintf
|
||
("%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
|
||
data->sblock.s_uuid[0], data->sblock.s_uuid[1],
|
||
data->sblock.s_uuid[2], data->sblock.s_uuid[3],
|
||
data->sblock.s_uuid[4], data->sblock.s_uuid[5],
|
||
data->sblock.s_uuid[6], data->sblock.s_uuid[7],
|
||
data->sblock.s_uuid[8], data->sblock.s_uuid[9],
|
||
data->sblock.s_uuid[10], data->sblock.s_uuid[11],
|
||
data->sblock.s_uuid[12], data->sblock.s_uuid[13],
|
||
data->sblock.s_uuid[14], data->sblock.s_uuid[15]);
|
||
}
|
||
else
|
||
*uuid = NULL;
|
||
|
||
grub_dl_unref (my_mod);
|
||
|
||
grub_free (data);
|
||
|
||
return grub_errno;
|
||
}
|
||
|
||
/* Get mtime. */
|
||
static grub_err_t
|
||
grub_nilfs2_mtime (grub_device_t device, grub_int32_t * tm)
|
||
{
|
||
struct grub_nilfs2_data *data;
|
||
grub_disk_t disk = device->disk;
|
||
|
||
grub_dl_ref (my_mod);
|
||
|
||
data = grub_nilfs2_mount (disk);
|
||
if (!data)
|
||
*tm = 0;
|
||
else
|
||
*tm = (grub_int32_t) grub_le_to_cpu64 (data->sblock.s_wtime);
|
||
|
||
grub_dl_unref (my_mod);
|
||
|
||
grub_free (data);
|
||
|
||
return grub_errno;
|
||
}
|
||
|
||
|
||
|
||
static struct grub_fs grub_nilfs2_fs = {
|
||
.name = "nilfs2",
|
||
.dir = grub_nilfs2_dir,
|
||
.open = grub_nilfs2_open,
|
||
.read = grub_nilfs2_read,
|
||
.close = grub_nilfs2_close,
|
||
.label = grub_nilfs2_label,
|
||
.uuid = grub_nilfs2_uuid,
|
||
.mtime = grub_nilfs2_mtime,
|
||
#ifdef GRUB_UTIL
|
||
.reserved_first_sector = 1,
|
||
.blocklist_install = 0,
|
||
#endif
|
||
.next = 0
|
||
};
|
||
|
||
GRUB_MOD_INIT (nilfs2)
|
||
{
|
||
COMPILE_TIME_ASSERT ((1 << LOG_NILFS_DAT_ENTRY_SIZE)
|
||
== sizeof (struct
|
||
grub_nilfs2_dat_entry));
|
||
COMPILE_TIME_ASSERT (1 << LOG_INODE_SIZE
|
||
== sizeof (struct grub_nilfs2_inode));
|
||
grub_fs_register (&grub_nilfs2_fs);
|
||
my_mod = mod;
|
||
}
|
||
|
||
GRUB_MOD_FINI (nilfs2)
|
||
{
|
||
grub_fs_unregister (&grub_nilfs2_fs);
|
||
}
|