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SubjectRe: [PATCH 1/2] f2fs-dev: support multi-device direct IO
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On 2019/1/2 17:06, sunqiuyang wrote:
> From: Qiuyang Sun <sunqiuyang@huawei.com>
>
> The physical blocks in struct f2fs_map_blocks must be in the same device.
>
> Signed-off-by: Qiuyang Sun <sunqiuyang@huawei.com>
> ---
> fs/f2fs/data.c | 20 +++++++++++++++++++-
> fs/f2fs/f2fs.h | 2 --
> 2 files changed, 19 insertions(+), 3 deletions(-)
>
> diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
> index e5cd3fd..7a6369e 100644
> --- a/fs/f2fs/data.c
> +++ b/fs/f2fs/data.c
> @@ -1076,6 +1076,8 @@ 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;
> + int devi;
> + block_t end_blk;
>
> if (!maxblocks)
> return 0;
> @@ -1207,8 +1209,15 @@ 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) {

int devi;

devi = f2fs_target_device_index(sbi, blkaddr);

> + 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 +1331,8 @@ 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);
> + int devi;
>
> map.m_lblk = iblock;
> map.m_len = bh->b_size >> inode->i_blkbits;
> @@ -1333,6 +1344,13 @@ 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) {

struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
int devi;

> + devi = f2fs_target_device_index(sbi, map.m_pblk);
> + if (devi) {

Is it possible that devi == 0?

> + bh->b_bdev = FDEV(devi).bdev;
> + bh->b_blocknr -= FDEV(devi).start_blk;
> + }
> + }
> bh->b_state = (bh->b_state & ~F2FS_MAP_FLAGS) | map.m_flags;
> bh->b_size = (u64)map.m_len << inode->i_blkbits;

For the write IO, we need to call update_device_state() to set dirty flag
in current device, in order to trigger flush command on right device during
fsync/fdatasync.

Thanks,

> }
> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
> index eeede26..b311471 100644
> --- a/fs/f2fs/f2fs.h
> +++ b/fs/f2fs/f2fs.h
> @@ -3595,8 +3595,6 @@ 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.
>

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