vbatts
/
grub
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity
grub/grub-core/fs/f2fs.c

1329 lines
36 KiB
C
Raw Permalink Blame History

/*
* f2fs.c - Flash-Friendly File System
*
* Written by Jaegeuk Kim <jaegeuk@kernel.org>
*
* Copyright (C) 2015 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/>.
*/
#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/charset.h>
#include <grub/fshelp.h>
GRUB_MOD_LICENSE ("GPLv3+");
/* F2FS Magic Number. */
#define F2FS_SUPER_MAGIC 0xf2f52010
#define CHECKSUM_OFFSET 4092 /* Must be aligned 4 bytes. */
#define U32_CHECKSUM_OFFSET (CHECKSUM_OFFSET >> 2)
#define CRCPOLY_LE 0xedb88320
/* Byte-size offset. */
#define F2FS_SUPER_OFFSET ((grub_disk_addr_t)1024)
#define F2FS_SUPER_OFFSET0 (F2FS_SUPER_OFFSET >> GRUB_DISK_SECTOR_BITS)
#define F2FS_SUPER_OFFSET1 ((F2FS_SUPER_OFFSET + F2FS_BLKSIZE) >> \
GRUB_DISK_SECTOR_BITS)
/* 9 bits for 512 bytes. */
#define F2FS_MIN_LOG_SECTOR_SIZE 9
/* Support only 4KB block. */
#define F2FS_BLK_BITS 12
#define F2FS_BLKSIZE (1 << F2FS_BLK_BITS)
#define F2FS_BLK_SEC_BITS (F2FS_BLK_BITS - GRUB_DISK_SECTOR_BITS)
#define VERSION_LEN 256
#define F2FS_MAX_EXTENSION 64
#define CP_COMPACT_SUM_FLAG 0x00000004
#define CP_UMOUNT_FLAG 0x00000001
#define MAX_ACTIVE_LOGS 16
#define MAX_ACTIVE_NODE_LOGS 8
#define MAX_ACTIVE_DATA_LOGS 8
#define NR_CURSEG_DATA_TYPE 3
#define NR_CURSEG_NODE_TYPE 3
#define NR_CURSEG_TYPE (NR_CURSEG_DATA_TYPE + NR_CURSEG_NODE_TYPE)
#define ENTRIES_IN_SUM 512
#define SUMMARY_SIZE 7
#define SUM_FOOTER_SIZE 5
#define JENTRY_SIZE (sizeof(struct grub_f2fs_nat_jent))
#define SUM_ENTRIES_SIZE (SUMMARY_SIZE * ENTRIES_IN_SUM)
#define SUM_JOURNAL_SIZE (F2FS_BLKSIZE - SUM_FOOTER_SIZE - SUM_ENTRIES_SIZE)
#define NAT_JOURNAL_ENTRIES ((SUM_JOURNAL_SIZE - 2) / JENTRY_SIZE)
#define NAT_JOURNAL_RESERVED ((SUM_JOURNAL_SIZE - 2) % JENTRY_SIZE)
#define NAT_ENTRY_SIZE (sizeof(struct grub_f2fs_nat_entry))
#define NAT_ENTRY_PER_BLOCK (F2FS_BLKSIZE / NAT_ENTRY_SIZE)
#define F2FS_NAME_LEN 255
#define F2FS_SLOT_LEN 8
#define NR_DENTRY_IN_BLOCK 214
#define SIZE_OF_DIR_ENTRY 11 /* By byte. */
#define BITS_PER_BYTE 8
#define SIZE_OF_DENTRY_BITMAP ((NR_DENTRY_IN_BLOCK + BITS_PER_BYTE - 1) / \
BITS_PER_BYTE)
#define SIZE_OF_RESERVED (F2FS_BLKSIZE - \
((SIZE_OF_DIR_ENTRY + F2FS_SLOT_LEN) * \
NR_DENTRY_IN_BLOCK + SIZE_OF_DENTRY_BITMAP))
#define F2FS_INLINE_XATTR_ADDRS 50 /* 200 bytes for inline xattrs. */
#define DEF_ADDRS_PER_INODE 923 /* Address Pointers in an Inode. */
#define ADDRS_PER_BLOCK 1018 /* Address Pointers in a Direct Block. */
#define NIDS_PER_BLOCK 1018 /* Node IDs in an Indirect Block. */
#define NODE_DIR1_BLOCK (DEF_ADDRS_PER_INODE + 1)
#define NODE_DIR2_BLOCK (DEF_ADDRS_PER_INODE + 2)
#define NODE_IND1_BLOCK (DEF_ADDRS_PER_INODE + 3)
#define NODE_IND2_BLOCK (DEF_ADDRS_PER_INODE + 4)
#define NODE_DIND_BLOCK (DEF_ADDRS_PER_INODE + 5)
#define MAX_INLINE_DATA (4 * (DEF_ADDRS_PER_INODE - \
F2FS_INLINE_XATTR_ADDRS - 1))
#define NR_INLINE_DENTRY (MAX_INLINE_DATA * BITS_PER_BYTE / \
((SIZE_OF_DIR_ENTRY + F2FS_SLOT_LEN) * \
BITS_PER_BYTE + 1))
#define INLINE_DENTRY_BITMAP_SIZE ((NR_INLINE_DENTRY + BITS_PER_BYTE - 1) / \
BITS_PER_BYTE)
#define INLINE_RESERVED_SIZE (MAX_INLINE_DATA - \
((SIZE_OF_DIR_ENTRY + F2FS_SLOT_LEN) * \
NR_INLINE_DENTRY + \
INLINE_DENTRY_BITMAP_SIZE))
#define CURSEG_HOT_DATA 0
#define CKPT_FLAG_SET(ckpt, f) (ckpt)->ckpt_flags & \
grub_cpu_to_le32_compile_time (f)
#define F2FS_INLINE_XATTR 0x01 /* File inline xattr flag. */
#define F2FS_INLINE_DATA 0x02 /* File inline data flag. */
#define F2FS_INLINE_DENTRY 0x04 /* File inline dentry flag. */
#define F2FS_DATA_EXIST 0x08 /* File inline data exist flag. */
#define F2FS_INLINE_DOTS 0x10 /* File having implicit dot dentries. */
#define MAX_VOLUME_NAME 512
enum FILE_TYPE
{
F2FS_FT_UNKNOWN,
F2FS_FT_REG_FILE = 1,
F2FS_FT_DIR = 2,
F2FS_FT_SYMLINK = 7
};
struct grub_f2fs_superblock
{
grub_uint32_t magic;
grub_uint16_t dummy1[2];
grub_uint32_t log_sectorsize;
grub_uint32_t log_sectors_per_block;
grub_uint32_t log_blocksize;
grub_uint32_t log_blocks_per_seg;
grub_uint32_t segs_per_sec;
grub_uint32_t secs_per_zone;
grub_uint32_t checksum_offset;
grub_uint8_t dummy2[40];
grub_uint32_t cp_blkaddr;
grub_uint32_t sit_blkaddr;
grub_uint32_t nat_blkaddr;
grub_uint32_t ssa_blkaddr;
grub_uint32_t main_blkaddr;
grub_uint32_t root_ino;
grub_uint32_t node_ino;
grub_uint32_t meta_ino;
grub_uint8_t uuid[16];
grub_uint16_t volume_name[MAX_VOLUME_NAME];
grub_uint32_t extension_count;
grub_uint8_t extension_list[F2FS_MAX_EXTENSION][8];
grub_uint32_t cp_payload;
grub_uint8_t version[VERSION_LEN];
grub_uint8_t init_version[VERSION_LEN];
} GRUB_PACKED;
struct grub_f2fs_checkpoint
{
grub_uint64_t checkpoint_ver;
grub_uint64_t user_block_count;
grub_uint64_t valid_block_count;
grub_uint32_t rsvd_segment_count;
grub_uint32_t overprov_segment_count;
grub_uint32_t free_segment_count;
grub_uint32_t cur_node_segno[MAX_ACTIVE_NODE_LOGS];
grub_uint16_t cur_node_blkoff[MAX_ACTIVE_NODE_LOGS];
grub_uint32_t cur_data_segno[MAX_ACTIVE_DATA_LOGS];
grub_uint16_t cur_data_blkoff[MAX_ACTIVE_DATA_LOGS];
grub_uint32_t ckpt_flags;
grub_uint32_t cp_pack_total_block_count;
grub_uint32_t cp_pack_start_sum;
grub_uint32_t valid_node_count;
grub_uint32_t valid_inode_count;
grub_uint32_t next_free_nid;
grub_uint32_t sit_ver_bitmap_bytesize;
grub_uint32_t nat_ver_bitmap_bytesize;
grub_uint32_t checksum_offset;
grub_uint64_t elapsed_time;
grub_uint8_t alloc_type[MAX_ACTIVE_LOGS];
grub_uint8_t sit_nat_version_bitmap[3900];
grub_uint32_t checksum;
} GRUB_PACKED;
struct grub_f2fs_nat_entry {
grub_uint8_t version;
grub_uint32_t ino;
grub_uint32_t block_addr;
} GRUB_PACKED;
struct grub_f2fs_nat_jent
{
grub_uint32_t nid;
struct grub_f2fs_nat_entry ne;
} GRUB_PACKED;
struct grub_f2fs_nat_journal {
grub_uint16_t n_nats;
struct grub_f2fs_nat_jent entries[NAT_JOURNAL_ENTRIES];
grub_uint8_t reserved[NAT_JOURNAL_RESERVED];
} GRUB_PACKED;
struct grub_f2fs_nat_block {
struct grub_f2fs_nat_entry ne[NAT_ENTRY_PER_BLOCK];
} GRUB_PACKED;
struct grub_f2fs_dir_entry
{
grub_uint32_t hash_code;
grub_uint32_t ino;
grub_uint16_t name_len;
grub_uint8_t file_type;
} GRUB_PACKED;
struct grub_f2fs_inline_dentry
{
grub_uint8_t dentry_bitmap[INLINE_DENTRY_BITMAP_SIZE];
grub_uint8_t reserved[INLINE_RESERVED_SIZE];
struct grub_f2fs_dir_entry dentry[NR_INLINE_DENTRY];
grub_uint8_t filename[NR_INLINE_DENTRY][F2FS_SLOT_LEN];
} GRUB_PACKED;
struct grub_f2fs_dentry_block {
grub_uint8_t dentry_bitmap[SIZE_OF_DENTRY_BITMAP];
grub_uint8_t reserved[SIZE_OF_RESERVED];
struct grub_f2fs_dir_entry dentry[NR_DENTRY_IN_BLOCK];
grub_uint8_t filename[NR_DENTRY_IN_BLOCK][F2FS_SLOT_LEN];
} GRUB_PACKED;
struct grub_f2fs_inode
{
grub_uint16_t i_mode;
grub_uint8_t i_advise;
grub_uint8_t i_inline;
grub_uint32_t i_uid;
grub_uint32_t i_gid;
grub_uint32_t i_links;
grub_uint64_t i_size;
grub_uint64_t i_blocks;
grub_uint64_t i_atime;
grub_uint64_t i_ctime;
grub_uint64_t i_mtime;
grub_uint32_t i_atime_nsec;
grub_uint32_t i_ctime_nsec;
grub_uint32_t i_mtime_nsec;
grub_uint32_t i_generation;
grub_uint32_t i_current_depth;
grub_uint32_t i_xattr_nid;
grub_uint32_t i_flags;
grub_uint32_t i_pino;
grub_uint32_t i_namelen;
grub_uint8_t i_name[F2FS_NAME_LEN];
grub_uint8_t i_dir_level;
grub_uint8_t i_ext[12];
grub_uint32_t i_addr[DEF_ADDRS_PER_INODE];
grub_uint32_t i_nid[5];
} GRUB_PACKED;
struct grub_direct_node {
grub_uint32_t addr[ADDRS_PER_BLOCK];
} GRUB_PACKED;
struct grub_indirect_node {
grub_uint32_t nid[NIDS_PER_BLOCK];
} GRUB_PACKED;
struct grub_f2fs_node
{
union
{
struct grub_f2fs_inode i;
struct grub_direct_node dn;
struct grub_indirect_node in;
/* Should occupy F2FS_BLKSIZE totally. */
char buf[F2FS_BLKSIZE - 40];
};
grub_uint8_t dummy[40];
} GRUB_PACKED;
struct grub_fshelp_node
{
struct grub_f2fs_data *data;
struct grub_f2fs_node inode;
grub_uint32_t ino;
int inode_read;
};
struct grub_f2fs_data
{
struct grub_f2fs_superblock sblock;
struct grub_f2fs_checkpoint ckpt;
grub_uint32_t root_ino;
grub_uint32_t blocks_per_seg;
grub_uint32_t cp_blkaddr;
grub_uint32_t nat_blkaddr;
struct grub_f2fs_nat_journal nat_j;
char *nat_bitmap;
grub_disk_t disk;
struct grub_f2fs_node *inode;
struct grub_fshelp_node diropen;
};
struct grub_f2fs_dir_iter_ctx
{
struct grub_f2fs_data *data;
grub_fshelp_iterate_dir_hook_t hook;
void *hook_data;
grub_uint8_t *bitmap;
grub_uint8_t (*filename)[F2FS_SLOT_LEN];
struct grub_f2fs_dir_entry *dentry;
int max;
};
struct grub_f2fs_dir_ctx
{
grub_fs_dir_hook_t hook;
void *hook_data;
struct grub_f2fs_data *data;
};
static grub_dl_t my_mod;
static int
grub_f2fs_test_bit_le (int nr, const grub_uint8_t *addr)
{
return addr[nr >> 3] & (1 << (nr & 7));
}
static char *
get_inline_addr (struct grub_f2fs_inode *inode)
{
return (char *) &inode->i_addr[1];
}
static grub_uint64_t
grub_f2fs_file_size (struct grub_f2fs_inode *inode)
{
return grub_le_to_cpu64 (inode->i_size);
}
static grub_uint32_t
start_cp_addr (struct grub_f2fs_data *data)
{
struct grub_f2fs_checkpoint *ckpt = &data->ckpt;
grub_uint32_t start_addr = data->cp_blkaddr;
if (!(ckpt->checkpoint_ver & grub_cpu_to_le64_compile_time(1)))
return start_addr + data->blocks_per_seg;
return start_addr;
}
static grub_uint32_t
start_sum_block (struct grub_f2fs_data *data)
{
struct grub_f2fs_checkpoint *ckpt = &data->ckpt;
return start_cp_addr (data) + grub_le_to_cpu32 (ckpt->cp_pack_start_sum);
}
static grub_uint32_t
sum_blk_addr (struct grub_f2fs_data *data, int base, int type)
{
struct grub_f2fs_checkpoint *ckpt = &data->ckpt;
return start_cp_addr (data) +
grub_le_to_cpu32 (ckpt->cp_pack_total_block_count) -
(base + 1) + type;
}
static void *
nat_bitmap_ptr (struct grub_f2fs_data *data)
{
struct grub_f2fs_checkpoint *ckpt = &data->ckpt;
grub_uint32_t offset;
if (grub_le_to_cpu32 (data->sblock.cp_payload) > 0)
return ckpt->sit_nat_version_bitmap;
offset = grub_le_to_cpu32 (ckpt->sit_ver_bitmap_bytesize);
return ckpt->sit_nat_version_bitmap + offset;
}
static grub_uint32_t
get_node_id (struct grub_f2fs_node *rn, int off, int inode_block)
{
if (inode_block)
return grub_le_to_cpu32 (rn->i.i_nid[off - NODE_DIR1_BLOCK]);
return grub_le_to_cpu32 (rn->in.nid[off]);
}
static grub_err_t
grub_f2fs_block_read (struct grub_f2fs_data *data, grub_uint32_t blkaddr,
void *buf)
{
return grub_disk_read (data->disk,
((grub_disk_addr_t)blkaddr) << F2FS_BLK_SEC_BITS,
0, F2FS_BLKSIZE, buf);
}
/* CRC32 */
static grub_uint32_t
grub_f2fs_cal_crc32 (const void *buf, const grub_uint32_t len)
{
grub_uint32_t crc = F2FS_SUPER_MAGIC;
unsigned char *p = (unsigned char *)buf;
grub_uint32_t tmp = len;
int i;
while (tmp--)
{
crc ^= *p++;
for (i = 0; i < 8; i++)
crc = (crc >> 1) ^ ((crc & 1) ? CRCPOLY_LE : 0);
}
return crc;
}
static int
grub_f2fs_crc_valid (grub_uint32_t blk_crc, void *buf, const grub_uint32_t len)
{
grub_uint32_t cal_crc = 0;
cal_crc = grub_f2fs_cal_crc32 (buf, len);
return (cal_crc == blk_crc) ? 1 : 0;
}
static int
grub_f2fs_test_bit (grub_uint32_t nr, const char *p)
{
int mask;
p += (nr >> 3);
mask = 1 << (7 - (nr & 0x07));
return mask & *p;
}
static int
grub_f2fs_sanity_check_sb (struct grub_f2fs_superblock *sb)
{
grub_uint32_t log_sectorsize, log_sectors_per_block;
if (sb->magic != grub_cpu_to_le32_compile_time (F2FS_SUPER_MAGIC))
return -1;
if (sb->log_blocksize != grub_cpu_to_le32_compile_time (F2FS_BLK_BITS))
return -1;
log_sectorsize = grub_le_to_cpu32 (sb->log_sectorsize);
log_sectors_per_block = grub_le_to_cpu32 (sb->log_sectors_per_block);
if (log_sectorsize > F2FS_BLK_BITS)
return -1;
if (log_sectorsize < F2FS_MIN_LOG_SECTOR_SIZE)
return -1;
if (log_sectors_per_block + log_sectorsize != F2FS_BLK_BITS)
return -1;
return 0;
}
static int
grub_f2fs_read_sb (struct grub_f2fs_data *data, grub_disk_addr_t offset)
{
grub_disk_t disk = data->disk;
grub_err_t err;
/* Read first super block. */
err = grub_disk_read (disk, offset, 0, sizeof (data->sblock), &data->sblock);
if (err)
return -1;
return grub_f2fs_sanity_check_sb (&data->sblock);
}
static void *
validate_checkpoint (struct grub_f2fs_data *data, grub_uint32_t cp_addr,
grub_uint64_t *version)
{
grub_uint32_t *cp_page_1, *cp_page_2;
struct grub_f2fs_checkpoint *cp_block;
grub_uint64_t cur_version = 0, pre_version = 0;
grub_uint32_t crc = 0;
grub_uint32_t crc_offset;
grub_err_t err;
/* Read the 1st cp block in this CP pack. */
cp_page_1 = grub_malloc (F2FS_BLKSIZE);
if (!cp_page_1)
return NULL;
err = grub_f2fs_block_read (data, cp_addr, cp_page_1);
if (err)
goto invalid_cp1;
cp_block = (struct grub_f2fs_checkpoint *)cp_page_1;
crc_offset = grub_le_to_cpu32 (cp_block->checksum_offset);
if (crc_offset != CHECKSUM_OFFSET)
goto invalid_cp1;
crc = grub_le_to_cpu32 (*(cp_page_1 + U32_CHECKSUM_OFFSET));
if (!grub_f2fs_crc_valid (crc, cp_block, crc_offset))
goto invalid_cp1;
pre_version = grub_le_to_cpu64 (cp_block->checkpoint_ver);
/* Read the 2nd cp block in this CP pack. */
cp_page_2 = grub_malloc (F2FS_BLKSIZE);
if (!cp_page_2)
goto invalid_cp1;
cp_addr += grub_le_to_cpu32 (cp_block->cp_pack_total_block_count) - 1;
err = grub_f2fs_block_read (data, cp_addr, cp_page_2);
if (err)
goto invalid_cp2;
cp_block = (struct grub_f2fs_checkpoint *)cp_page_2;
crc_offset = grub_le_to_cpu32 (cp_block->checksum_offset);
if (crc_offset != CHECKSUM_OFFSET)
goto invalid_cp2;
crc = grub_le_to_cpu32 (*(cp_page_2 + U32_CHECKSUM_OFFSET));
if (!grub_f2fs_crc_valid (crc, cp_block, crc_offset))
goto invalid_cp2;
cur_version = grub_le_to_cpu64 (cp_block->checkpoint_ver);
if (cur_version == pre_version)
{
*version = cur_version;
grub_free (cp_page_2);
return cp_page_1;
}
invalid_cp2:
grub_free (cp_page_2);
invalid_cp1:
grub_free (cp_page_1);
return NULL;
}
static grub_err_t
grub_f2fs_read_cp (struct grub_f2fs_data *data)
{
void *cp1, *cp2, *cur_page;
grub_uint64_t cp1_version = 0, cp2_version = 0;
grub_uint64_t cp_start_blk_no;
/*
* Finding out valid cp block involves read both
* sets (cp pack1 and cp pack 2).
*/
cp_start_blk_no = data->cp_blkaddr;
cp1 = validate_checkpoint (data, cp_start_blk_no, &cp1_version);
if (!cp1 && grub_errno)
return grub_errno;
/* The second checkpoint pack should start at the next segment. */
cp_start_blk_no += data->blocks_per_seg;
cp2 = validate_checkpoint (data, cp_start_blk_no, &cp2_version);
if (!cp2 && grub_errno)
{
grub_free (cp1);
return grub_errno;
}
if (cp1 && cp2)
cur_page = (cp2_version > cp1_version) ? cp2 : cp1;
else if (cp1)
cur_page = cp1;
else if (cp2)
cur_page = cp2;
else
return grub_error (GRUB_ERR_BAD_FS, "no checkpoints");
grub_memcpy (&data->ckpt, cur_page, F2FS_BLKSIZE);
grub_free (cp1);
grub_free (cp2);
return 0;
}
static grub_err_t
get_nat_journal (struct grub_f2fs_data *data)
{
grub_uint32_t block;
char *buf;
grub_err_t err;
buf = grub_malloc (F2FS_BLKSIZE);
if (!buf)
return grub_errno;
if (CKPT_FLAG_SET(&data->ckpt, CP_COMPACT_SUM_FLAG))
block = start_sum_block (data);
else if (CKPT_FLAG_SET (&data->ckpt, CP_UMOUNT_FLAG))
block = sum_blk_addr (data, NR_CURSEG_TYPE, CURSEG_HOT_DATA);
else
block = sum_blk_addr (data, NR_CURSEG_DATA_TYPE, CURSEG_HOT_DATA);
err = grub_f2fs_block_read (data, block, buf);
if (err)
goto fail;
if (CKPT_FLAG_SET (&data->ckpt, CP_COMPACT_SUM_FLAG))
grub_memcpy (&data->nat_j, buf, SUM_JOURNAL_SIZE);
else
grub_memcpy (&data->nat_j, buf + SUM_ENTRIES_SIZE, SUM_JOURNAL_SIZE);
fail:
grub_free (buf);
return err;
}
static grub_uint32_t
get_blkaddr_from_nat_journal (struct grub_f2fs_data *data, grub_uint32_t nid)
{
grub_uint16_t n = grub_le_to_cpu16 (data->nat_j.n_nats);
grub_uint32_t blkaddr = 0;
grub_uint16_t i;
for (i = 0; i < n; i++)
{
if (grub_le_to_cpu32 (data->nat_j.entries[i].nid) == nid)
{
blkaddr = grub_le_to_cpu32 (data->nat_j.entries[i].ne.block_addr);
break;
}
}
return blkaddr;
}
static grub_uint32_t
get_node_blkaddr (struct grub_f2fs_data *data, grub_uint32_t nid)
{
struct grub_f2fs_nat_block *nat_block;
grub_uint32_t seg_off, block_off, entry_off, block_addr;
grub_uint32_t blkaddr;
grub_err_t err;
blkaddr = get_blkaddr_from_nat_journal (data, nid);
if (blkaddr)
return blkaddr;
nat_block = grub_malloc (F2FS_BLKSIZE);
if (!nat_block)
return 0;
block_off = nid / NAT_ENTRY_PER_BLOCK;
entry_off = nid % NAT_ENTRY_PER_BLOCK;
seg_off = block_off / data->blocks_per_seg;
block_addr = data->nat_blkaddr +
((seg_off * data->blocks_per_seg) << 1) +
(block_off & (data->blocks_per_seg - 1));
if (grub_f2fs_test_bit (block_off, data->nat_bitmap))
block_addr += data->blocks_per_seg;
err = grub_f2fs_block_read (data, block_addr, nat_block);
if (err)
{
grub_free (nat_block);
return 0;
}
blkaddr = grub_le_to_cpu32 (nat_block->ne[entry_off].block_addr);
grub_free (nat_block);
return blkaddr;
}
static int
grub_get_node_path (struct grub_f2fs_inode *inode, grub_uint32_t block,
grub_uint32_t offset[4], grub_uint32_t noffset[4])
{
grub_uint32_t direct_blks = ADDRS_PER_BLOCK;
grub_uint32_t dptrs_per_blk = NIDS_PER_BLOCK;
grub_uint32_t indirect_blks = ADDRS_PER_BLOCK * NIDS_PER_BLOCK;
grub_uint32_t dindirect_blks = indirect_blks * NIDS_PER_BLOCK;
grub_uint32_t direct_index = DEF_ADDRS_PER_INODE;
int n = 0;
int level = -1;
if (inode->i_inline & F2FS_INLINE_XATTR)
direct_index -= F2FS_INLINE_XATTR_ADDRS;
noffset[0] = 0;
if (block < direct_index)
{
offset[n] = block;
level = 0;
goto got;
}
block -= direct_index;
if (block < direct_blks)
{
offset[n++] = NODE_DIR1_BLOCK;
noffset[n] = 1;
offset[n] = block;
level = 1;
goto got;
}
block -= direct_blks;
if (block < direct_blks)
{
offset[n++] = NODE_DIR2_BLOCK;
noffset[n] = 2;
offset[n] = block;
level = 1;
goto got;
}
block -= direct_blks;
if (block < indirect_blks)
{
offset[n++] = NODE_IND1_BLOCK;
noffset[n] = 3;
offset[n++] = block / direct_blks;
noffset[n] = 4 + offset[n - 1];
offset[n] = block % direct_blks;
level = 2;
goto got;
}
block -= indirect_blks;
if (block < indirect_blks)
{
offset[n++] = NODE_IND2_BLOCK;
noffset[n] = 4 + dptrs_per_blk;
offset[n++] = block / direct_blks;
noffset[n] = 5 + dptrs_per_blk + offset[n - 1];
offset[n] = block % direct_blks;
level = 2;
goto got;
}
block -= indirect_blks;
if (block < dindirect_blks)
{
offset[n++] = NODE_DIND_BLOCK;
noffset[n] = 5 + (dptrs_per_blk * 2);
offset[n++] = block / indirect_blks;
noffset[n] = 6 + (dptrs_per_blk * 2) +
offset[n - 1] * (dptrs_per_blk + 1);
offset[n++] = (block / direct_blks) % dptrs_per_blk;
noffset[n] = 7 + (dptrs_per_blk * 2) +
offset[n - 2] * (dptrs_per_blk + 1) + offset[n - 1];
offset[n] = block % direct_blks;
level = 3;
goto got;
}
got:
return level;
}
static grub_err_t
grub_f2fs_read_node (struct grub_f2fs_data *data,
grub_uint32_t nid, struct grub_f2fs_node *np)
{
grub_uint32_t blkaddr;
blkaddr = get_node_blkaddr (data, nid);
if (!blkaddr)
return grub_errno;
return grub_f2fs_block_read (data, blkaddr, np);
}
static struct grub_f2fs_data *
grub_f2fs_mount (grub_disk_t disk)
{
struct grub_f2fs_data *data;
grub_err_t err;
data = grub_malloc (sizeof (*data));
if (!data)
return NULL;
data->disk = disk;
if (grub_f2fs_read_sb (data, F2FS_SUPER_OFFSET0))
{
if (grub_f2fs_read_sb (data, F2FS_SUPER_OFFSET1))
{
if (grub_errno == GRUB_ERR_NONE)
grub_error (GRUB_ERR_BAD_FS,
"not a F2FS filesystem (no superblock)");
goto fail;
}
}
data->root_ino = grub_le_to_cpu32 (data->sblock.root_ino);
data->cp_blkaddr = grub_le_to_cpu32 (data->sblock.cp_blkaddr);
data->nat_blkaddr = grub_le_to_cpu32 (data->sblock.nat_blkaddr);
data->blocks_per_seg = 1 <<
grub_le_to_cpu32 (data->sblock.log_blocks_per_seg);
err = grub_f2fs_read_cp (data);
if (err)
goto fail;
data->nat_bitmap = nat_bitmap_ptr (data);
err = get_nat_journal (data);
if (err)
goto fail;
data->diropen.data = data;
data->diropen.ino = data->root_ino;
data->diropen.inode_read = 1;
data->inode = &data->diropen.inode;
err = grub_f2fs_read_node (data, data->root_ino, data->inode);
if (err)
goto fail;
return data;
fail:
grub_free (data);
return NULL;
}
/* Guarantee inline_data was handled by caller. */
static grub_disk_addr_t
grub_f2fs_get_block (grub_fshelp_node_t node, grub_disk_addr_t block_ofs)
{
struct grub_f2fs_data *data = node->data;
struct grub_f2fs_inode *inode = &node->inode.i;
grub_uint32_t offset[4], noffset[4], nids[4];
struct grub_f2fs_node *node_block;
grub_uint32_t block_addr = -1;
int level, i;
level = grub_get_node_path (inode, block_ofs, offset, noffset);
if (level < 0)
return -1;
if (level == 0)
return grub_le_to_cpu32 (inode->i_addr[offset[0]]);
node_block = grub_malloc (F2FS_BLKSIZE);
if (!node_block)
return -1;
nids[1] = get_node_id (&node->inode, offset[0], 1);
/* Get indirect or direct nodes. */
for (i = 1; i <= level; i++)
{
grub_f2fs_read_node (data, nids[i], node_block);
if (grub_errno)
goto fail;
if (i < level)
nids[i + 1] = get_node_id (node_block, offset[i], 0);
}
block_addr = grub_le_to_cpu32 (node_block->dn.addr[offset[level]]);
fail:
grub_free (node_block);
return block_addr;
}
static grub_ssize_t
grub_f2fs_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)
{
struct grub_f2fs_inode *inode = &node->inode.i;
grub_off_t filesize = grub_f2fs_file_size (inode);
char *inline_addr = get_inline_addr (inode);
if (inode->i_inline & F2FS_INLINE_DATA)
{
if (filesize > MAX_INLINE_DATA)
return -1;
if (len > filesize - pos)
len = filesize - pos;
grub_memcpy (buf, inline_addr + pos, len);
return len;
}
return grub_fshelp_read_file (node->data->disk, node,
read_hook, read_hook_data,
pos, len, buf, grub_f2fs_get_block,
filesize,
F2FS_BLK_SEC_BITS, 0);
}
static char *
grub_f2fs_read_symlink (grub_fshelp_node_t node)
{
char *symlink;
struct grub_fshelp_node *diro = node;
grub_uint64_t filesize;
if (!diro->inode_read)
{
grub_f2fs_read_node (diro->data, diro->ino, &diro->inode);
if (grub_errno)
return 0;
}
filesize = grub_f2fs_file_size(&diro->inode.i);
symlink = grub_malloc (filesize + 1);
if (!symlink)
return 0;
grub_f2fs_read_file (diro, 0, 0, 0, filesize, symlink);
if (grub_errno)
{
grub_free (symlink);
return 0;
}
symlink[filesize] = '\0';
return symlink;
}
static int
grub_f2fs_check_dentries (struct grub_f2fs_dir_iter_ctx *ctx)
{
struct grub_fshelp_node *fdiro;
int i;
for (i = 0; i < ctx->max;)
{
char *filename;
enum grub_fshelp_filetype type = GRUB_FSHELP_UNKNOWN;
enum FILE_TYPE ftype;
int name_len;
int ret;
if (grub_f2fs_test_bit_le (i, ctx->bitmap) == 0)
{
i++;
continue;
}
ftype = ctx->dentry[i].file_type;
name_len = grub_le_to_cpu16 (ctx->dentry[i].name_len);
filename = grub_malloc (name_len + 1);
if (!filename)
return 0;
grub_memcpy (filename, ctx->filename[i], name_len);
filename[name_len] = 0;
fdiro = grub_malloc (sizeof (struct grub_fshelp_node));
if (!fdiro)
{
grub_free(filename);
return 0;
}
if (ftype == F2FS_FT_DIR)
type = GRUB_FSHELP_DIR;
else if (ftype == F2FS_FT_SYMLINK)
type = GRUB_FSHELP_SYMLINK;
else if (ftype == F2FS_FT_REG_FILE)
type = GRUB_FSHELP_REG;
fdiro->data = ctx->data;
fdiro->ino = grub_le_to_cpu32 (ctx->dentry[i].ino);
fdiro->inode_read = 0;
ret = ctx->hook (filename, type, fdiro, ctx->hook_data);
grub_free(filename);
if (ret)
return 1;
i += (name_len + F2FS_SLOT_LEN - 1) / F2FS_SLOT_LEN;
}
return 0;
}
static int
grub_f2fs_iterate_inline_dir (struct grub_f2fs_inode *dir,
struct grub_f2fs_dir_iter_ctx *ctx)
{
struct grub_f2fs_inline_dentry *de_blk;
de_blk = (struct grub_f2fs_inline_dentry *) get_inline_addr (dir);
ctx->bitmap = de_blk->dentry_bitmap;
ctx->dentry = de_blk->dentry;
ctx->filename = de_blk->filename;
ctx->max = NR_INLINE_DENTRY;
return grub_f2fs_check_dentries (ctx);
}
static int
grub_f2fs_iterate_dir (grub_fshelp_node_t dir,
grub_fshelp_iterate_dir_hook_t hook, void *hook_data)
{
struct grub_fshelp_node *diro = (struct grub_fshelp_node *) dir;
struct grub_f2fs_inode *inode;
struct grub_f2fs_dir_iter_ctx ctx = {
.data = diro->data,
.hook = hook,
.hook_data = hook_data
};
grub_off_t fpos = 0;
if (!diro->inode_read)
{
grub_f2fs_read_node (diro->data, diro->ino, &diro->inode);
if (grub_errno)
return 0;
}
inode = &diro->inode.i;
if (inode->i_inline & F2FS_INLINE_DENTRY)
return grub_f2fs_iterate_inline_dir (inode, &ctx);
while (fpos < grub_f2fs_file_size (inode))
{
struct grub_f2fs_dentry_block *de_blk;
char *buf;
int ret;
buf = grub_zalloc (F2FS_BLKSIZE);
if (!buf)
return 0;
grub_f2fs_read_file (diro, 0, 0, fpos, F2FS_BLKSIZE, buf);
if (grub_errno)
{
grub_free (buf);
return 0;
}
de_blk = (struct grub_f2fs_dentry_block *) buf;
ctx.bitmap = de_blk->dentry_bitmap;
ctx.dentry = de_blk->dentry;
ctx.filename = de_blk->filename;
ctx.max = NR_DENTRY_IN_BLOCK;
ret = grub_f2fs_check_dentries (&ctx);
grub_free (buf);
if (ret)
return 1;
fpos += F2FS_BLKSIZE;
}
return 0;
}
static int
grub_f2fs_dir_iter (const char *filename, enum grub_fshelp_filetype filetype,
grub_fshelp_node_t node, void *data)
{
struct grub_f2fs_dir_ctx *ctx = data;
struct grub_dirhook_info info;
grub_memset (&info, 0, sizeof (info));
if (!node->inode_read)
{
grub_f2fs_read_node (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.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_f2fs_dir (grub_device_t device, const char *path,
grub_fs_dir_hook_t hook, void *hook_data)
{
struct grub_f2fs_dir_ctx ctx = {
.hook = hook,
.hook_data = hook_data
};
struct grub_fshelp_node *fdiro = 0;
grub_dl_ref (my_mod);
ctx.data = grub_f2fs_mount (device->disk);
if (!ctx.data)
goto fail;
grub_fshelp_find_file (path, &ctx.data->diropen, &fdiro,
grub_f2fs_iterate_dir, grub_f2fs_read_symlink,
GRUB_FSHELP_DIR);
if (grub_errno)
goto fail;
grub_f2fs_iterate_dir (fdiro, grub_f2fs_dir_iter, &ctx);
fail:
if (fdiro != &ctx.data->diropen)
grub_free (fdiro);
grub_free (ctx.data);
grub_dl_unref (my_mod);
return grub_errno;
}
/* Open a file named NAME and initialize FILE. */
static grub_err_t
grub_f2fs_open (struct grub_file *file, const char *name)
{
struct grub_f2fs_data *data = NULL;
struct grub_fshelp_node *fdiro = 0;
struct grub_f2fs_inode *inode;
grub_dl_ref (my_mod);
data = grub_f2fs_mount (file->device->disk);
if (!data)
goto fail;
grub_fshelp_find_file (name, &data->diropen, &fdiro,
grub_f2fs_iterate_dir, grub_f2fs_read_symlink,
GRUB_FSHELP_REG);
if (grub_errno)
goto fail;
if (!fdiro->inode_read)
{
grub_f2fs_read_node (data, fdiro->ino, &fdiro->inode);
if (grub_errno)
goto fail;
}
grub_memcpy (data->inode, &fdiro->inode, sizeof (*data->inode));
grub_free (fdiro);
inode = &(data->inode->i);
file->size = grub_f2fs_file_size (inode);
file->data = data;
file->offset = 0;
if (inode->i_inline & F2FS_INLINE_DATA && file->size > MAX_INLINE_DATA)
grub_error (GRUB_ERR_BAD_FS, "corrupted inline_data: need fsck");
return 0;
fail:
if (fdiro != &data->diropen)
grub_free (fdiro);
grub_free (data);
grub_dl_unref (my_mod);
return grub_errno;
}
static grub_ssize_t
grub_f2fs_read (grub_file_t file, char *buf, grub_size_t len)
{
struct grub_f2fs_data *data = (struct grub_f2fs_data *) file->data;
return grub_f2fs_read_file (&data->diropen,
file->read_hook, file->read_hook_data,
file->offset, len, buf);
}
static grub_err_t
grub_f2fs_close (grub_file_t file)
{
struct grub_f2fs_data *data = (struct grub_f2fs_data *) file->data;
grub_free (data);
grub_dl_unref (my_mod);
return GRUB_ERR_NONE;
}
static grub_uint8_t *
grub_f2fs_utf16_to_utf8 (grub_uint16_t *in_buf_le)
{
grub_uint16_t in_buf[MAX_VOLUME_NAME];
grub_uint8_t *out_buf;
int len = 0;
out_buf = grub_malloc (MAX_VOLUME_NAME * GRUB_MAX_UTF8_PER_UTF16 + 1);
if (!out_buf)
return NULL;
while (*in_buf_le != 0 && len < MAX_VOLUME_NAME) {
in_buf[len] = grub_le_to_cpu16 (in_buf_le[len]);
len++;
}
*grub_utf16_to_utf8 (out_buf, in_buf, len) = '\0';
return out_buf;
}
#if __GNUC__ >= 9
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Waddress-of-packed-member"
#endif
static grub_err_t
grub_f2fs_label (grub_device_t device, char **label)
{
struct grub_f2fs_data *data;
grub_disk_t disk = device->disk;
grub_dl_ref (my_mod);
data = grub_f2fs_mount (disk);
if (data)
*label = (char *) grub_f2fs_utf16_to_utf8 (data->sblock.volume_name);
else
*label = NULL;
grub_free (data);
grub_dl_unref (my_mod);
return grub_errno;
}
#if __GNUC__ >= 9
#pragma GCC diagnostic pop
#endif
static grub_err_t
grub_f2fs_uuid (grub_device_t device, char **uuid)
{
struct grub_f2fs_data *data;
grub_disk_t disk = device->disk;
grub_dl_ref (my_mod);
data = grub_f2fs_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.uuid[0], data->sblock.uuid[1],
data->sblock.uuid[2], data->sblock.uuid[3],
data->sblock.uuid[4], data->sblock.uuid[5],
data->sblock.uuid[6], data->sblock.uuid[7],
data->sblock.uuid[8], data->sblock.uuid[9],
data->sblock.uuid[10], data->sblock.uuid[11],
data->sblock.uuid[12], data->sblock.uuid[13],
data->sblock.uuid[14], data->sblock.uuid[15]);
}
else
*uuid = NULL;
grub_free (data);
grub_dl_unref (my_mod);
return grub_errno;
}
static struct grub_fs grub_f2fs_fs = {
.name = "f2fs",
.fs_dir = grub_f2fs_dir,
.fs_open = grub_f2fs_open,
.fs_read = grub_f2fs_read,
.fs_close = grub_f2fs_close,
.fs_label = grub_f2fs_label,
.fs_uuid = grub_f2fs_uuid,
#ifdef GRUB_UTIL
.reserved_first_sector = 1,
.blocklist_install = 0,
#endif
.next = 0
};
GRUB_MOD_INIT (f2fs)
{
grub_fs_register (&grub_f2fs_fs);
my_mod = mod;
}
GRUB_MOD_FINI (f2fs)
{
grub_fs_unregister (&grub_f2fs_fs);
}
Reference in New Issue View Git Blame Copy Permalink