grub/grub-core/fs/nilfs2.c

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/*
* nilfs2.c - New Implementation of Log filesystem
*
* Written by Jiro SEKIBA <jir@unicus.jp>
*
* Copyright (C) 2003,2004,2005,2007,2008,2010 Free Software Foundation, Inc.
*
* GRUB is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* GRUB is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
*/
/* Filetype information as used in inodes. */
#define FILETYPE_INO_MASK 0170000
#define FILETYPE_INO_REG 0100000
#define FILETYPE_INO_DIRECTORY 0040000
#define FILETYPE_INO_SYMLINK 0120000
#include <grub/err.h>
#include <grub/file.h>
#include <grub/mm.h>
#include <grub/misc.h>
#include <grub/disk.h>
#include <grub/dl.h>
#include <grub/types.h>
#include <grub/fshelp.h>
GRUB_MOD_LICENSE ("GPLv3+");
#define NILFS_INODE_BMAP_SIZE 7
#define NILFS_SUPORT_REV 2
/* Magic value used to identify an nilfs2 filesystem. */
#define NILFS2_SUPER_MAGIC 0x3434
/* nilfs btree node flag. */
#define NILFS_BTREE_NODE_ROOT 0x01
/* nilfs btree node level. */
#define NILFS_BTREE_LEVEL_DATA 0
#define NILFS_BTREE_LEVEL_NODE_MIN (NILFS_BTREE_LEVEL_DATA + 1)
/* nilfs 1st super block posission from beginning of the partition
in 512 block size */
#define NILFS_1ST_SUPER_BLOCK 2
/* nilfs 2nd super block posission from beginning of the partition
in 512 block size */
#define NILFS_2ND_SUPER_BLOCK(devsize) (((devsize >> 3) - 1) << 3)
#define LOG_INODE_SIZE 7
struct grub_nilfs2_inode
{
grub_uint64_t i_blocks;
grub_uint64_t i_size;
grub_uint64_t i_ctime;
grub_uint64_t i_mtime;
grub_uint32_t i_ctime_nsec;
grub_uint32_t i_mtime_nsec;
grub_uint32_t i_uid;
grub_uint32_t i_gid;
grub_uint16_t i_mode;
grub_uint16_t i_links_count;
grub_uint32_t i_flags;
grub_uint64_t i_bmap[NILFS_INODE_BMAP_SIZE];
#define i_device_code i_bmap[0]
grub_uint64_t i_xattr;
grub_uint32_t i_generation;
grub_uint32_t i_pad;
};
struct grub_nilfs2_super_root
{
grub_uint32_t sr_sum;
grub_uint16_t sr_bytes;
grub_uint16_t sr_flags;
grub_uint64_t sr_nongc_ctime;
struct grub_nilfs2_inode sr_dat;
struct grub_nilfs2_inode sr_cpfile;
struct grub_nilfs2_inode sr_sufile;
};
struct grub_nilfs2_super_block
{
grub_uint32_t s_rev_level;
grub_uint16_t s_minor_rev_level;
grub_uint16_t s_magic;
grub_uint16_t s_bytes;
grub_uint16_t s_flags;
grub_uint32_t s_crc_seed;
grub_uint32_t s_sum;
grub_uint32_t s_log_block_size;
grub_uint64_t s_nsegments;
grub_uint64_t s_dev_size;
grub_uint64_t s_first_data_block;
grub_uint32_t s_blocks_per_segment;
grub_uint32_t s_r_segments_percentage;
grub_uint64_t s_last_cno;
grub_uint64_t s_last_pseg;
grub_uint64_t s_last_seq;
grub_uint64_t s_free_blocks_count;
grub_uint64_t s_ctime;
grub_uint64_t s_mtime;
grub_uint64_t s_wtime;
grub_uint16_t s_mnt_count;
grub_uint16_t s_max_mnt_count;
grub_uint16_t s_state;
grub_uint16_t s_errors;
grub_uint64_t s_lastcheck;
grub_uint32_t s_checkinterval;
grub_uint32_t s_creator_os;
grub_uint16_t s_def_resuid;
grub_uint16_t s_def_resgid;
grub_uint32_t s_first_ino;
grub_uint16_t s_inode_size;
grub_uint16_t s_dat_entry_size;
grub_uint16_t s_checkpoint_size;
grub_uint16_t s_segment_usage_size;
grub_uint8_t s_uuid[16];
char s_volume_name[80];
grub_uint32_t s_c_interval;
grub_uint32_t s_c_block_max;
grub_uint32_t s_reserved[192];
};
struct grub_nilfs2_dir_entry
{
grub_uint64_t inode;
grub_uint16_t rec_len;
grub_uint8_t name_len;
grub_uint8_t file_type;
#if 0 /* followed by file name. */
char name[NILFS_NAME_LEN];
char pad;
#endif
} __attribute__ ((packed));
enum
{
NILFS_FT_UNKNOWN,
NILFS_FT_REG_FILE,
NILFS_FT_DIR,
NILFS_FT_CHRDEV,
NILFS_FT_BLKDEV,
NILFS_FT_FIFO,
NILFS_FT_SOCK,
NILFS_FT_SYMLINK,
NILFS_FT_MAX
};
struct grub_nilfs2_finfo
{
grub_uint64_t fi_ino;
grub_uint64_t fi_cno;
grub_uint32_t fi_nblocks;
grub_uint32_t fi_ndatablk;
};
struct grub_nilfs2_binfo_v
{
grub_uint64_t bi_vblocknr;
grub_uint64_t bi_blkoff;
};
struct grub_nilfs2_binfo_dat
{
grub_uint64_t bi_blkoff;
grub_uint8_t bi_level;
grub_uint8_t bi_pad[7];
};
union grub_nilfs2_binfo
{
struct grub_nilfs2_binfo_v bi_v;
struct grub_nilfs2_binfo_dat bi_dat;
};
struct grub_nilfs2_segment_summary
{
grub_uint32_t ss_datasum;
grub_uint32_t ss_sumsum;
grub_uint32_t ss_magic;
grub_uint16_t ss_bytes;
grub_uint16_t ss_flags;
grub_uint64_t ss_seq;
grub_uint64_t ss_create;
grub_uint64_t ss_next;
grub_uint32_t ss_nblocks;
grub_uint32_t ss_nfinfo;
grub_uint32_t ss_sumbytes;
grub_uint32_t ss_pad;
};
struct grub_nilfs2_btree_node
{
grub_uint8_t bn_flags;
grub_uint8_t bn_level;
grub_uint16_t bn_nchildren;
grub_uint32_t bn_pad;
grub_uint64_t keys[0];
};
struct grub_nilfs2_palloc_group_desc
{
grub_uint32_t pg_nfrees;
};
#define LOG_NILFS_DAT_ENTRY_SIZE 5
struct grub_nilfs2_dat_entry
{
grub_uint64_t de_blocknr;
grub_uint64_t de_start;
grub_uint64_t de_end;
grub_uint64_t de_rsv;
};
struct grub_nilfs2_snapshot_list
{
grub_uint64_t ssl_next;
grub_uint64_t ssl_prev;
};
struct grub_nilfs2_cpfile_header
{
grub_uint64_t ch_ncheckpoints;
grub_uint64_t ch_nsnapshots;
struct grub_nilfs2_snapshot_list ch_snapshot_list;
};
struct grub_nilfs2_checkpoint
{
grub_uint32_t cp_flags;
grub_uint32_t cp_checkpoints_count;
struct grub_nilfs2_snapshot_list cp_snapshot_list;
grub_uint64_t cp_cno;
grub_uint64_t cp_create;
grub_uint64_t cp_nblk_inc;
grub_uint64_t cp_inodes_count;
grub_uint64_t cp_blocks_count;
struct grub_nilfs2_inode cp_ifile_inode;
};
#define NILFS_BMAP_LARGE 0x1
#define NILFS_BMAP_SIZE (NILFS_INODE_BMAP_SIZE * sizeof(grub_uint64_t))
/* nilfs extra padding for nonroot btree node. */
#define NILFS_BTREE_NODE_EXTRA_PAD_SIZE (sizeof(grub_uint64_t))
#define NILFS_BTREE_ROOT_SIZE NILFS_BMAP_SIZE
#define NILFS_BTREE_ROOT_NCHILDREN_MAX \
((NILFS_BTREE_ROOT_SIZE - sizeof(struct nilfs_btree_node)) / \
(sizeof(grub_uint64_t) + sizeof(grub_uint64_t)) )
struct grub_fshelp_node
{
struct grub_nilfs2_data *data;
struct grub_nilfs2_inode inode;
grub_uint64_t ino;
int inode_read;
};
struct grub_nilfs2_data
{
struct grub_nilfs2_super_block sblock;
struct grub_nilfs2_super_root sroot;
struct grub_nilfs2_inode ifile;
grub_disk_t disk;
struct grub_nilfs2_inode *inode;
struct grub_fshelp_node diropen;
};
/* Log2 size of nilfs2 block in 512 blocks. */
#define LOG2_NILFS2_BLOCK_SIZE(data) \
(grub_le_to_cpu32 (data->sblock.s_log_block_size) + 1)
/* Log2 size of nilfs2 block in bytes. */
#define LOG2_BLOCK_SIZE(data) \
(grub_le_to_cpu32 (data->sblock.s_log_block_size) + 10)
/* The size of an nilfs2 block in bytes. */
#define NILFS2_BLOCK_SIZE(data) (1 << LOG2_BLOCK_SIZE (data))
static grub_uint64_t
grub_nilfs2_dat_translate (struct grub_nilfs2_data *data, grub_uint64_t key);
static grub_dl_t my_mod;
static inline unsigned long
grub_nilfs2_log_palloc_entries_per_group (struct grub_nilfs2_data *data)
{
return LOG2_BLOCK_SIZE (data) + 3;
}
static inline grub_uint64_t
grub_nilfs2_palloc_group (struct grub_nilfs2_data *data,
grub_uint64_t nr, grub_uint64_t * offset)
{
*offset = nr & ((1 << grub_nilfs2_log_palloc_entries_per_group (data)) - 1);
return nr >> grub_nilfs2_log_palloc_entries_per_group (data);
}
static inline grub_uint32_t
grub_nilfs2_palloc_groups_per_desc_block (struct grub_nilfs2_data *data)
{
return NILFS2_BLOCK_SIZE (data) /
sizeof (struct grub_nilfs2_palloc_group_desc);
}
static inline grub_uint32_t
grub_nilfs2_log_entries_per_block_log (struct grub_nilfs2_data *data,
unsigned long log_entry_size)
{
return LOG2_BLOCK_SIZE (data) - log_entry_size;
}
static inline grub_uint32_t
grub_nilfs2_blocks_per_group_log (struct grub_nilfs2_data *data,
unsigned long log_entry_size)
{
return (1 << (grub_nilfs2_log_palloc_entries_per_group (data)
- grub_nilfs2_log_entries_per_block_log (data,
log_entry_size))) + 1;
}
static inline grub_uint32_t
grub_nilfs2_blocks_per_desc_block_log (struct grub_nilfs2_data *data,
unsigned long log_entry_size)
{
return grub_nilfs2_palloc_groups_per_desc_block (data) *
grub_nilfs2_blocks_per_group_log (data, log_entry_size) + 1;
}
static inline grub_uint32_t
grub_nilfs2_palloc_desc_block_offset_log (struct grub_nilfs2_data *data,
unsigned long group,
unsigned long log_entry_size)
{
grub_uint32_t desc_block =
group / grub_nilfs2_palloc_groups_per_desc_block (data);
return desc_block * grub_nilfs2_blocks_per_desc_block_log (data,
log_entry_size);
}
static inline grub_uint32_t
grub_nilfs2_palloc_bitmap_block_offset (struct grub_nilfs2_data *data,
unsigned long group,
unsigned long log_entry_size)
{
unsigned long desc_offset = group %
grub_nilfs2_palloc_groups_per_desc_block (data);
return grub_nilfs2_palloc_desc_block_offset_log (data, group, log_entry_size)
+ 1
+ desc_offset * grub_nilfs2_blocks_per_group_log (data, log_entry_size);
}
static inline grub_uint32_t
grub_nilfs2_palloc_entry_offset_log (struct grub_nilfs2_data *data,
grub_uint64_t nr,
unsigned long log_entry_size)
{
unsigned long group;
grub_uint64_t group_offset;
group = grub_nilfs2_palloc_group (data, nr, &group_offset);
return grub_nilfs2_palloc_bitmap_block_offset (data, group,
log_entry_size) + 1 +
(group_offset >> grub_nilfs2_log_entries_per_block_log (data,
log_entry_size));
}
static inline struct grub_nilfs2_btree_node *
grub_nilfs2_btree_get_root (struct grub_nilfs2_inode *inode)
{
return (struct grub_nilfs2_btree_node *) &inode->i_bmap[0];
}
static inline int
grub_nilfs2_btree_get_level (struct grub_nilfs2_btree_node *node)
{
return node->bn_level;
}
static inline grub_uint64_t *
grub_nilfs2_btree_node_dkeys (struct grub_nilfs2_btree_node *node)
{
return (node->keys +
((node->bn_flags & NILFS_BTREE_NODE_ROOT) ?
0 : (NILFS_BTREE_NODE_EXTRA_PAD_SIZE / sizeof (grub_uint64_t))));
}
static inline grub_uint64_t
grub_nilfs2_btree_node_get_key (struct grub_nilfs2_btree_node *node,
int index)
{
return grub_le_to_cpu64 (*(grub_nilfs2_btree_node_dkeys (node) + index));
}
static inline int
grub_nilfs2_btree_node_lookup (struct grub_nilfs2_btree_node *node,
grub_uint64_t key, int *indexp)
{
grub_uint64_t nkey;
int index, low, high, s;
low = 0;
high = grub_le_to_cpu16 (node->bn_nchildren) - 1;
index = 0;
s = 0;
while (low <= high)
{
index = (low + high) / 2;
nkey = grub_nilfs2_btree_node_get_key (node, index);
if (nkey == key)
{
*indexp = index;
return 1;
}
else if (nkey < key)
{
low = index + 1;
s = -1;
}
else
{
high = index - 1;
s = 1;
}
}
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;
GRUB_PROPERLY_ALIGNED_ARRAY (block, NILFS2_BLOCK_SIZE (data));
grub_uint64_t ptr;
int level, found, index;
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)
{
return -1;
}
node = (struct grub_nilfs2_btree_node *) block;
if (node->bn_level != level)
{
grub_error (GRUB_ERR_BAD_FS, "btree level mismatch\n");
return -1;
}
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");
return -1;
}
}
if (!found)
return -1;
return ptr;
}
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,
void NESTED_FUNC_ATTR (*read_hook) (grub_disk_addr_t
sector,
unsigned offset,
unsigned length),
grub_off_t pos, grub_size_t len, char *buf)
{
return grub_fshelp_read_file (node->data->disk, node, read_hook,
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;
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,
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,
int NESTED_FUNC_ATTR
(*hook) (const char *filename,
enum grub_fshelp_filetype filetype,
grub_fshelp_node_t node))
{
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, 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[dirent.name_len + 1];
struct grub_fshelp_node *fdiro;
enum grub_fshelp_filetype type = GRUB_FSHELP_UNKNOWN;
grub_nilfs2_read_file (diro, 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))
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->offset, len, buf);
}
static grub_err_t
grub_nilfs2_dir (grub_device_t device, const char *path,
int (*hook) (const char *filename,
const struct grub_dirhook_info * info))
{
struct grub_nilfs2_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)
{
grub_nilfs2_read_inode (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 hook (filename, &info);
}
grub_dl_ref (my_mod);
data = grub_nilfs2_mount (device->disk);
if (!data)
goto fail;
grub_fshelp_find_file (path, &data->diropen, &fdiro,
grub_nilfs2_iterate_dir, grub_nilfs2_read_symlink,
GRUB_FSHELP_DIR);
if (grub_errno)
goto fail;
grub_nilfs2_iterate_dir (fdiro, iterate);
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_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);
}