Hi, Jaegeuk
On 2017/3/10 5:28, Jaegeuk Kim wrote:
> Hi Yunlei,
>
> On 03/07, Yunlei He wrote:
>> This patch allow write data to normal file when writting
>> new checkpoint.
>>
>> Signed-off-by: Yunlei He <[email protected]>
>> ---
>> fs/f2fs/checkpoint.c | 4 +++-
>> fs/f2fs/data.c | 23 ++++++++++++++++-------
>> fs/f2fs/f2fs.h | 1 +
>> fs/f2fs/super.c | 1 +
>> 4 files changed, 21 insertions(+), 8 deletions(-)
>>
>> diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c
>> index 0339daf..1d86171 100644
>> --- a/fs/f2fs/checkpoint.c
>> +++ b/fs/f2fs/checkpoint.c
>> @@ -979,9 +979,10 @@ static int block_operations(struct f2fs_sb_info *sbi)
>> * POR: we should ensure that there are no dirty node pages
>> * until finishing nat/sit flush.
>> */
>> +
>> + down_write(&sbi->node_change);
>> retry_flush_nodes:
>> down_write(&sbi->node_write);
>> -
>> if (get_pages(sbi, F2FS_DIRTY_NODES)) {
>> up_write(&sbi->node_write);
>> err = sync_node_pages(sbi, &wbc);
>> @@ -992,6 +993,7 @@ static int block_operations(struct f2fs_sb_info *sbi)
>> goto retry_flush_nodes;
>> }
>> out:
>> + up_write(&sbi->node_change);
>
> After block_operation, block allocator updates some block counters in terms of
> node or data blocks which will be written in checkpoint.
Yes, you are right! Can we prepare the checkpoint pack before we allow write
page cache?
Thanks
>
> Thanks,
>
>> blk_finish_plug(&plug);
>> return err;
>> }
>> diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
>> index 1375fef..c7eccb0 100644
>> --- a/fs/f2fs/data.c
>> +++ b/fs/f2fs/data.c
>> @@ -827,7 +827,9 @@ int f2fs_map_blocks(struct inode *inode, struct
>> f2fs_map_blocks *map,
>> }
>>
>> next_dnode:
>> - if (create)
>> + if (create && flag == F2FS_GET_BLOCK_PRE_AIO)
>> + down_read(&sbi->node_change);
>> + else if (create)
>> f2fs_lock_op(sbi);
>>
>> /* When reading holes, we need its node page */
>> @@ -936,17 +938,23 @@ int f2fs_map_blocks(struct inode *inode, struct
>> f2fs_map_blocks *map,
>> goto next_block;
>>
>> f2fs_put_dnode(&dn);
>> -
>> - if (create) {
>> + if (create && flag == F2FS_GET_BLOCK_PRE_AIO) {
>> + up_read(&sbi->node_change);
>> + f2fs_balance_fs(sbi, dn.node_changed);
>> + } else if (create) {
>> f2fs_unlock_op(sbi);
>> f2fs_balance_fs(sbi, dn.node_changed);
>> }
>> +
>> goto next_dnode;
>>
>> sync_out:
>> f2fs_put_dnode(&dn);
>> unlock_out:
>> - if (create) {
>> + if (create && flag == F2FS_GET_BLOCK_PRE_AIO) {
>> + up_read(&sbi->node_change);
>> + f2fs_balance_fs(sbi, dn.node_changed);
>> + } else if (create) {
>> f2fs_unlock_op(sbi);
>> f2fs_balance_fs(sbi, dn.node_changed);
>> }
>> @@ -1686,7 +1694,7 @@ static int prepare_write_begin(struct f2fs_sb_info
>> *sbi,
>>
>> if (f2fs_has_inline_data(inode) ||
>> (pos & PAGE_MASK) >= i_size_read(inode)) {
>> - f2fs_lock_op(sbi);
>> + down_read(&sbi->node_change);
>> locked = true;
>> }
>> restart:
>> @@ -1703,6 +1711,7 @@ static int prepare_write_begin(struct f2fs_sb_info
>> *sbi,
>> if (pos + len <= MAX_INLINE_DATA) {
>> read_inline_data(page, ipage);
>> set_inode_flag(inode, FI_DATA_EXIST);
>> + dn.node_changed = true;
>> if (inode->i_nlink)
>> set_inline_node(ipage);
>> } else {
>> @@ -1722,7 +1731,7 @@ static int prepare_write_begin(struct f2fs_sb_info
>> *sbi,
>> err = get_dnode_of_data(&dn, index, LOOKUP_NODE);
>> if (err || dn.data_blkaddr == NULL_ADDR) {
>> f2fs_put_dnode(&dn);
>> - f2fs_lock_op(sbi);
>> + down_read(&sbi->node_change);
>> locked = true;
>> goto restart;
>> }
>> @@ -1736,7 +1745,7 @@ static int prepare_write_begin(struct f2fs_sb_info
>> *sbi,
>> f2fs_put_dnode(&dn);
>> unlock_out:
>> if (locked)
>> - f2fs_unlock_op(sbi);
>> + up_read(&sbi->node_change);
>> return err;
>> }
>>
>> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
>> index 7e29249..0568f78 100644
>> --- a/fs/f2fs/f2fs.h
>> +++ b/fs/f2fs/f2fs.h
>> @@ -830,6 +830,7 @@ struct f2fs_sb_info {
>> struct mutex cp_mutex; /* checkpoint procedure lock */
>> struct rw_semaphore cp_rwsem; /* blocking FS operations */
>> struct rw_semaphore node_write; /* locking node writes */
>> + struct rw_semaphore node_change; /* locking node change
>> */
>> wait_queue_head_t cp_wait;
>> unsigned long last_time[MAX_TIME]; /* to store time in jiffies */
>> long interval_time[MAX_TIME]; /* to store thresholds */
>> diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
>> index 2d494d5..d217114 100644
>> --- a/fs/f2fs/super.c
>> +++ b/fs/f2fs/super.c
>> @@ -1929,6 +1929,7 @@ static int f2fs_fill_super(struct super_block *sb,
>> void *data, int silent)
>> mutex_init(&sbi->gc_mutex);
>> mutex_init(&sbi->cp_mutex);
>> init_rwsem(&sbi->node_write);
>> + init_rwsem(&sbi->node_change);
>>
>> /* disallow all the data/node/meta page writes */
>> set_sbi_flag(sbi, SBI_POR_DOING);
>> --
>> 2.10.1
>>
>>
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>
> .
>
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