Hi Changman,
2014-05-12 (월), 15:59 +0900, Changman Lee:
> f2fs's cp has one page which consists of struct f2fs_checkpoint and
> version bitmap of sit and nat. To support lots of segments, we need more
> blocks for sit bitmap. So let's arrange sit bitmap as following:
> +-----------------+------------+
> | f2fs_checkpoint | sit bitmap |
> | + nat bitmap | |
> +-----------------+------------+
> 0 4k N blocks
>
> Signed-off-by: Changman Lee <cm224....@samsung.com>
> ---
> fs/f2fs/checkpoint.c | 47
> ++++++++++++++++++++++++++++++++++++++++++++---
> fs/f2fs/f2fs.h | 13 +++++++++++--
> include/linux/f2fs_fs.h | 2 ++
> 3 files changed, 57 insertions(+), 5 deletions(-)
>
> diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c
> index fe968c7..f418243 100644
> --- a/fs/f2fs/checkpoint.c
> +++ b/fs/f2fs/checkpoint.c
> @@ -544,6 +544,32 @@ int get_valid_checkpoint(struct f2fs_sb_info *sbi)
> cp_block = (struct f2fs_checkpoint *)page_address(cur_page);
> memcpy(sbi->ckpt, cp_block, blk_size);
>
> + if (is_set_ckpt_flags(sbi->ckpt, CP_LARGE_VOL_FLAG)) {
> + int i, cp_blks;
> + block_t cp_blk_no;
> +
> + cp_blk_no = le32_to_cpu(fsb->cp_blkaddr);
> + if (cur_page == cp2)
> + cp_blk_no += 1 << le32_to_cpu(fsb->log_blocks_per_seg);
> +
> + cp_blks = 1 + F2FS_BLK_ALIGN(cp_block->sit_ver_bitmap_bytesize);
Should covert le32_to_cpu(cp_block->sit_ver_bitmap_bytesize).
> +
> + kfree(sbi->ckpt);
> + sbi->ckpt = kzalloc(cp_blks * blk_size, GFP_KERNEL);
Why does it have to reallocate this and not to handle -ENOMEM correctly?
> +
> + memcpy(sbi->ckpt, cp_block, blk_size);
> +
> + for (i = 1; i < cp_blks; i++) {
> + void *sit_bitmap_ptr;
> + unsigned char *ckpt = (unsigned char *)sbi->ckpt;
> +
> + cur_page = get_meta_page(sbi, cp_blk_no + i);
> + sit_bitmap_ptr = page_address(cur_page);
> + memcpy(ckpt + i * blk_size, sit_bitmap_ptr, blk_size);
> + f2fs_put_page(cur_page, 1);
> + }
> + }
> +
> f2fs_put_page(cp1, 1);
> f2fs_put_page(cp2, 1);
> return 0;
> @@ -736,6 +762,7 @@ static void do_checkpoint(struct f2fs_sb_info *sbi, bool
> is_umount)
> __u32 crc32 = 0;
> void *kaddr;
> int i;
> + int sit_bitmap_blks = 0;
>
> /*
> * This avoids to conduct wrong roll-forward operations and uses
> @@ -786,16 +813,21 @@ static void do_checkpoint(struct f2fs_sb_info *sbi,
> bool is_umount)
>
> orphan_blocks = (sbi->n_orphans + F2FS_ORPHANS_PER_BLOCK - 1)
> / F2FS_ORPHANS_PER_BLOCK;
> - ckpt->cp_pack_start_sum = cpu_to_le32(1 + orphan_blocks);
> + if (is_set_ckpt_flags(ckpt, CP_LARGE_VOL_FLAG))
> + sit_bitmap_blks = F2FS_BLK_ALIGN(ckpt->sit_ver_bitmap_bytesize);
> + ckpt->cp_pack_start_sum = cpu_to_le32(1 + sit_bitmap_blks +
> + orphan_blocks);
>
> if (is_umount) {
> set_ckpt_flags(ckpt, CP_UMOUNT_FLAG);
> ckpt->cp_pack_total_block_count = cpu_to_le32(2 +
> - data_sum_blocks + orphan_blocks + NR_CURSEG_NODE_TYPE);
> + sit_bitmap_blks + data_sum_blocks +
> + orphan_blocks + NR_CURSEG_NODE_TYPE);
> } else {
> clear_ckpt_flags(ckpt, CP_UMOUNT_FLAG);
> ckpt->cp_pack_total_block_count = cpu_to_le32(2 +
> - data_sum_blocks + orphan_blocks);
> + sit_bitmap_blks + data_sum_blocks +
> + orphan_blocks);
> }
>
> if (sbi->n_orphans)
> @@ -821,6 +853,15 @@ static void do_checkpoint(struct f2fs_sb_info *sbi, bool
> is_umount)
> set_page_dirty(cp_page);
> f2fs_put_page(cp_page, 1);
>
> + for (i = 1; i < 1 + sit_bitmap_blks; i++) {
> + cp_page = grab_meta_page(sbi, start_blk++);
> + kaddr = page_address(cp_page);
> + memcpy(kaddr, (char *)ckpt + i * F2FS_BLKSIZE,
> + (1 << sbi->log_blocksize));
> + set_page_dirty(cp_page);
> + f2fs_put_page(cp_page, 1);
> + }
> +
> if (sbi->n_orphans) {
> write_orphan_inodes(sbi, start_blk);
> start_blk += orphan_blocks;
> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
> index 676a2c6..9e147ae 100644
> --- a/fs/f2fs/f2fs.h
> +++ b/fs/f2fs/f2fs.h
> @@ -764,9 +764,18 @@ static inline unsigned long __bitmap_size(struct
> f2fs_sb_info *sbi, int flag)
> static inline void *__bitmap_ptr(struct f2fs_sb_info *sbi, int flag)
> {
> struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
> - int offset = (flag == NAT_BITMAP) ?
> + int offset;
> +
> + if (ckpt->ckpt_flags & CP_LARGE_VOL_FLAG) {
Should call is_set_ckpt_flag(ckpt, CP_LARGE_VOL_FLAG) to avoid endian
conversion issue.
Thanks,
> + if (flag == NAT_BITMAP)
> + return &ckpt->sit_nat_version_bitmap;
> + else
> + return ((unsigned char *)ckpt + F2FS_BLKSIZE);
> + } else {
> + offset = (flag == NAT_BITMAP) ?
> le32_to_cpu(ckpt->sit_ver_bitmap_bytesize) : 0;
> - return &ckpt->sit_nat_version_bitmap + offset;
> + return &ckpt->sit_nat_version_bitmap + offset;
> + }
> }
>
> static inline block_t __start_cp_addr(struct f2fs_sb_info *sbi)
> diff --git a/include/linux/f2fs_fs.h b/include/linux/f2fs_fs.h
> index 8c03f71..0f0b788 100644
> --- a/include/linux/f2fs_fs.h
> +++ b/include/linux/f2fs_fs.h
> @@ -19,6 +19,7 @@
> #define F2FS_LOG_SECTORS_PER_BLOCK 3 /* 4KB: F2FS_BLKSIZE */
> #define F2FS_BLKSIZE 4096 /* support only 4KB block */
> #define F2FS_MAX_EXTENSION 64 /* # of extension entries */
> +#define F2FS_BLK_ALIGN(x) (((x) + F2FS_BLKSIZE - 1) / F2FS_BLKSIZE)
>
> #define NULL_ADDR ((block_t)0) /* used as block_t addresses */
> #define NEW_ADDR ((block_t)-1) /* used as block_t addresses */
> @@ -80,6 +81,7 @@ struct f2fs_super_block {
> /*
> * For checkpoint
> */
> +#define CP_LARGE_VOL_FLAG 0x00000010
> #define CP_ERROR_FLAG 0x00000008
> #define CP_COMPACT_SUM_FLAG 0x00000004
> #define CP_ORPHAN_PRESENT_FLAG 0x00000002
--
Jaegeuk Kim
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