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SubjectRe: [PATCH v3 1/2] f2fs-dev: support multi-device direct IO
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On 2019/1/7 10:19, sunqiuyang wrote:
> From: Qiuyang Sun <sunqiuyang@huawei.com>
>
> Changelog v1 ==> v2:
> 1. Modify the definition of update_device_state(),
> and call it in direct write;
> 2. Move some local variables into branches where they are used.
>
> Changelog v2 ==> v3:
> Rename update_device_state() to f2fs_update_device_state() like other
> exported function names, otherwise it may pollute global namespace of
> functions in kernel.
>
> Signed-off-by: Qiuyang Sun <sunqiuyang@huawei.com>
> ---
> fs/f2fs/data.c | 25 ++++++++++++++++++++++++-
> fs/f2fs/f2fs.h | 4 ++--
> fs/f2fs/segment.c | 12 ++++++------
> 3 files changed, 32 insertions(+), 9 deletions(-)
>
> diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
> index e5cd3fd..b35e042 100644
> --- a/fs/f2fs/data.c
> +++ b/fs/f2fs/data.c
> @@ -1076,6 +1076,7 @@ int f2fs_map_blocks(struct inode *inode, struct f2fs_map_blocks *map,
> struct extent_info ei = {0,0,0};
> block_t blkaddr;
> unsigned int start_pgofs;
> + block_t end_blk;
>
> if (!maxblocks)
> return 0;
> @@ -1207,8 +1208,17 @@ int f2fs_map_blocks(struct inode *inode, struct f2fs_map_blocks *map,
>
> map->m_pblk = blkaddr;
> map->m_len = 1;
> +
> + if (sbi->s_ndevs && blkaddr != NEW_ADDR &&
> + blkaddr != NULL_ADDR) {

Minor, if (sbi->s_ndevs && __is_valid_data_blkaddr(blkaddr)), maybe Jaegeuk
can help to clean up this when merging this patch.

Anyway, it looks good to me. :)

Reviewed-by: Chao Yu <yuchao0@huawei.com>

Thanks,


> + int devi;
> +
> + devi = f2fs_target_device_index(sbi, blkaddr);
> + end_blk = FDEV(devi).end_blk;
> + }
> } else if ((map->m_pblk != NEW_ADDR &&
> - blkaddr == (map->m_pblk + ofs)) ||
> + blkaddr == (map->m_pblk + ofs) &&
> + (!sbi->s_ndevs || blkaddr <= end_blk)) ||
> (map->m_pblk == NEW_ADDR && blkaddr == NEW_ADDR) ||
> flag == F2FS_GET_BLOCK_PRE_DIO) {
> ofs++;
> @@ -1322,6 +1332,7 @@ static int __get_data_block(struct inode *inode, sector_t iblock,
> {
> struct f2fs_map_blocks map;
> int err;
> + struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
>
> map.m_lblk = iblock;
> map.m_len = bh->b_size >> inode->i_blkbits;
> @@ -1333,6 +1344,18 @@ static int __get_data_block(struct inode *inode, sector_t iblock,
> err = f2fs_map_blocks(inode, &map, create, flag);
> if (!err) {
> map_bh(bh, inode->i_sb, map.m_pblk);
> + if (sbi->s_ndevs) {
> + int devi;
> +
> + devi = f2fs_target_device_index(sbi, map.m_pblk);
> + if (devi) {
> + bh->b_bdev = FDEV(devi).bdev;
> + bh->b_blocknr -= FDEV(devi).start_blk;
> + }
> + if (may_write)
> + f2fs_update_device_state(sbi, inode->i_ino,
> + map.m_pblk);
> + }
> bh->b_state = (bh->b_state & ~F2FS_MAP_FLAGS) | map.m_flags;
> bh->b_size = (u64)map.m_len << inode->i_blkbits;
> }
> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
> index eeede26..7e423e4 100644
> --- a/fs/f2fs/f2fs.h
> +++ b/fs/f2fs/f2fs.h
> @@ -3056,6 +3056,8 @@ int f2fs_lookup_journal_in_cursum(struct f2fs_journal *journal, int type,
> int f2fs_rw_hint_to_seg_type(enum rw_hint hint);
> enum rw_hint f2fs_io_type_to_rw_hint(struct f2fs_sb_info *sbi,
> enum page_type type, enum temp_type temp);
> +void f2fs_update_device_state(struct f2fs_sb_info *sbi, nid_t ino,
> + block_t blkaddr);
>
> /*
> * checkpoint.c
> @@ -3595,8 +3597,6 @@ static inline bool f2fs_force_buffered_io(struct inode *inode,
>
> if (f2fs_post_read_required(inode))
> return true;
> - if (sbi->s_ndevs)
> - return true;
> /*
> * for blkzoned device, fallback direct IO to buffered IO, so
> * all IOs can be serialized by log-structured write.
> diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
> index a361d61..2a21d87 100644
> --- a/fs/f2fs/segment.c
> +++ b/fs/f2fs/segment.c
> @@ -3050,18 +3050,18 @@ void f2fs_allocate_data_block(struct f2fs_sb_info *sbi, struct page *page,
> up_read(&SM_I(sbi)->curseg_lock);
> }
>
> -static void update_device_state(struct f2fs_io_info *fio)
> +void f2fs_update_device_state(struct f2fs_sb_info *sbi, nid_t ino,
> + block_t blkaddr)
> {
> - struct f2fs_sb_info *sbi = fio->sbi;
> unsigned int devidx;
>
> if (!sbi->s_ndevs)
> return;
>
> - devidx = f2fs_target_device_index(sbi, fio->new_blkaddr);
> + devidx = f2fs_target_device_index(sbi, blkaddr);
>
> /* update device state for fsync */
> - f2fs_set_dirty_device(sbi, fio->ino, devidx, FLUSH_INO);
> + f2fs_set_dirty_device(sbi, ino, devidx, FLUSH_INO);
>
> /* update device state for checkpoint */
> if (!f2fs_test_bit(devidx, (char *)&sbi->dirty_device)) {
> @@ -3092,7 +3092,7 @@ static void do_write_page(struct f2fs_summary *sum, struct f2fs_io_info *fio)
> goto reallocate;
> }
>
> - update_device_state(fio);
> + f2fs_update_device_state(fio->sbi, fio->ino, fio->new_blkaddr);
>
> if (keep_order)
> up_read(&fio->sbi->io_order_lock);
> @@ -3168,7 +3168,7 @@ int f2fs_inplace_write_data(struct f2fs_io_info *fio)
> else
> err = f2fs_submit_page_bio(fio);
> if (!err)
> - update_device_state(fio);
> + f2fs_update_device_state(fio->sbi, fio->ino, fio->new_blkaddr);
>
> f2fs_update_iostat(fio->sbi, fio->io_type, F2FS_BLKSIZE);
>
>

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