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grub/grub-core/fs/f2fs.c
Jaegeuk Kim 71f9e4ac44 fs: Add F2FS support 
"F2FS (Flash-Friendly File System) is flash-friendly file system which was merged
into Linux kernel v3.8 in 2013.

The motive for F2FS was to build a file system that from the start, takes into
account the characteristics of NAND flash memory-based storage devices (such as
solid-state disks, eMMC, and SD cards).

F2FS was designed on a basis of a log-structured file system approach, which
remedies some known issues of the older log structured file systems, such as
the snowball effect of wandering trees and high cleaning overhead. In addition,
since a NAND-based storage device shows different characteristics according to
its internal geometry or flash memory management scheme (such as the Flash
Translation Layer or FTL), it supports various parameters not only for
configuring on-disk layout, but also for selecting allocation and cleaning
algorithm.", quote by https://en.wikipedia.org/wiki/F2FS.

The source codes for F2FS are available from:

http://git.kernel.org/cgit/linux/kernel/git/jaegeuk/f2fs.git
http://git.kernel.org/cgit/linux/kernel/git/jaegeuk/f2fs-tools.git

This patch has been integrated in OpenMandriva Lx 3.
  https://www.openmandriva.org/

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: Pete Batard <pete@akeo.ie>
Signed-off-by: Daniel Kiper <daniel.kiper@oracle.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
2018-04-10 19:05:04 +02:00

1314 lines
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/*
* 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 = 0;
if (inode->i_inline & F2FS_INLINE_XATTR)
direct_index -= F2FS_INLINE_XATTR_ADDRS;
noffset[0] = 0;
if (block < direct_index)
{
offset[n] = block;
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 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;
}
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;
}
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",
.dir = grub_f2fs_dir,
.open = grub_f2fs_open,
.read = grub_f2fs_read,
.close = grub_f2fs_close,
.label = grub_f2fs_label,
.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);
}
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