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f2fs: allow write page cache when writting cp 

This patch allow write data to normal file when writting
new checkpoint.

We relax three limitations for write_begin path:
1. data allocation
2. node allocation
3. variables in checkpoint

Signed-off-by: Yunlei He <heyunlei@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Yunlei He 2017-03-13 20:22:18 +08:00 committed by Jaegeuk Kim
parent 22588f8773
commit 59c9081bc8
5 changed files with 58 additions and 24 deletions
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40
fs/f2fs/checkpoint.c
View File

@ -944,6 +944,19 @@ int f2fs_sync_inode_meta(struct f2fs_sb_info *sbi)
return 0;
}
static void __prepare_cp_block(struct f2fs_sb_info *sbi)
{
struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
struct f2fs_nm_info *nm_i = NM_I(sbi);
nid_t last_nid = nm_i->next_scan_nid;
next_free_nid(sbi, &last_nid);
ckpt->valid_block_count = cpu_to_le64(valid_user_blocks(sbi));
ckpt->valid_node_count = cpu_to_le32(valid_node_count(sbi));
ckpt->valid_inode_count = cpu_to_le32(valid_inode_count(sbi));
ckpt->next_free_nid = cpu_to_le32(last_nid);
}
/*
* Freeze all the FS-operations for checkpoint.
*/
@ -970,7 +983,14 @@ retry_flush_dents:
goto retry_flush_dents;
}
/*
* POR: we should ensure that there are no dirty node pages
* until finishing nat/sit flush. inode->i_blocks can be updated.
*/
down_write(&sbi->node_change);
if (get_pages(sbi, F2FS_DIRTY_IMETA)) {
up_write(&sbi->node_change);
f2fs_unlock_all(sbi);
err = f2fs_sync_inode_meta(sbi);
if (err)
@ -978,10 +998,6 @@ retry_flush_dents:
goto retry_flush_dents;
}
/*
* POR: we should ensure that there are no dirty node pages
* until finishing nat/sit flush.
*/
retry_flush_nodes:
down_write(&sbi->node_write);
@ -989,11 +1005,19 @@ retry_flush_nodes:
up_write(&sbi->node_write);
err = sync_node_pages(sbi, &wbc);
if (err) {
up_write(&sbi->node_change);
f2fs_unlock_all(sbi);
goto out;
}
goto retry_flush_nodes;
}
/*
* sbi->node_change is used only for AIO write_begin path which produces
* dirty node blocks and some checkpoint values by block allocation.
*/
__prepare_cp_block(sbi);
up_write(&sbi->node_change);
out:
blk_finish_plug(&plug);
return err;
@ -1061,7 +1085,6 @@ static int do_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc)
struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
struct f2fs_nm_info *nm_i = NM_I(sbi);
unsigned long orphan_num = sbi->im[ORPHAN_INO].ino_num;
nid_t last_nid = nm_i->next_scan_nid;
block_t start_blk;
unsigned int data_sum_blocks, orphan_blocks;
__u32 crc32 = 0;
@ -1078,14 +1101,11 @@ static int do_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc)
return -EIO;
}
next_free_nid(sbi, &last_nid);
/*
* modify checkpoint
* version number is already updated
*/
ckpt->elapsed_time = cpu_to_le64(get_mtime(sbi));
ckpt->valid_block_count = cpu_to_le64(valid_user_blocks(sbi));
ckpt->free_segment_count = cpu_to_le32(free_segments(sbi));
for (i = 0; i < NR_CURSEG_NODE_TYPE; i++) {
ckpt->cur_node_segno[i] =
@ -1104,10 +1124,6 @@ static int do_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc)
curseg_alloc_type(sbi, i + CURSEG_HOT_DATA);
}
ckpt->valid_node_count = cpu_to_le32(valid_node_count(sbi));
ckpt->valid_inode_count = cpu_to_le32(valid_inode_count(sbi));
ckpt->next_free_nid = cpu_to_le32(last_nid);
/* 2 cp + n data seg summary + orphan inode blocks */
data_sum_blocks = npages_for_summary_flush(sbi, false);
spin_lock(&sbi->cp_lock);

28
fs/f2fs/data.c
View File

@ -787,6 +787,21 @@ int f2fs_preallocate_blocks(struct kiocb *iocb, struct iov_iter *from)
return err;
}
static inline void __do_map_lock(struct f2fs_sb_info *sbi, int flag, bool lock)
{
if (flag == F2FS_GET_BLOCK_PRE_AIO) {
if (lock)
down_read(&sbi->node_change);
else
up_read(&sbi->node_change);
} else {
if (lock)
f2fs_lock_op(sbi);
else
f2fs_unlock_op(sbi);
}
}
/*
* f2fs_map_blocks() now supported readahead/bmap/rw direct_IO with
* f2fs_map_blocks structure.
@ -829,7 +844,7 @@ int f2fs_map_blocks(struct inode *inode, struct f2fs_map_blocks *map,
next_dnode:
if (create)
f2fs_lock_op(sbi);
__do_map_lock(sbi, flag, true);
/* When reading holes, we need its node page */
set_new_dnode(&dn, inode, NULL, NULL, 0);
@ -939,7 +954,7 @@ skip:
f2fs_put_dnode(&dn);
if (create) {
f2fs_unlock_op(sbi);
__do_map_lock(sbi, flag, false);
f2fs_balance_fs(sbi, dn.node_changed);
}
goto next_dnode;
@ -948,7 +963,7 @@ sync_out:
f2fs_put_dnode(&dn);
unlock_out:
if (create) {
f2fs_unlock_op(sbi);
__do_map_lock(sbi, flag, false);
f2fs_balance_fs(sbi, dn.node_changed);
}
out:
@ -1688,7 +1703,7 @@ 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);
__do_map_lock(sbi, F2FS_GET_BLOCK_PRE_AIO, true);
locked = true;
}
restart:
@ -1724,7 +1739,8 @@ restart:
err = get_dnode_of_data(&dn, index, LOOKUP_NODE);
if (err || dn.data_blkaddr == NULL_ADDR) {
f2fs_put_dnode(&dn);
f2fs_lock_op(sbi);
__do_map_lock(sbi, F2FS_GET_BLOCK_PRE_AIO,
true);
locked = true;
goto restart;
}
@ -1738,7 +1754,7 @@ out:
f2fs_put_dnode(&dn);
unlock_out:
if (locked)
f2fs_unlock_op(sbi);
__do_map_lock(sbi, F2FS_GET_BLOCK_PRE_AIO, false);
return err;
}

1
fs/f2fs/f2fs.h
View File

@ -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 */

12
fs/f2fs/node.c
View File

@ -2448,10 +2448,11 @@ static void __flush_nat_entry_set(struct f2fs_sb_info *sbi,
f2fs_put_page(page, 1);
}
f2fs_bug_on(sbi, set->entry_cnt);
radix_tree_delete(&NM_I(sbi)->nat_set_root, set->set);
kmem_cache_free(nat_entry_set_slab, set);
/* Allow dirty nats by node block allocation in write_begin */
if (!set->entry_cnt) {
radix_tree_delete(&NM_I(sbi)->nat_set_root, set->set);
kmem_cache_free(nat_entry_set_slab, set);
}
}
/*
@ -2496,8 +2497,7 @@ void flush_nat_entries(struct f2fs_sb_info *sbi, struct cp_control *cpc)
__flush_nat_entry_set(sbi, set, cpc);
up_write(&nm_i->nat_tree_lock);
f2fs_bug_on(sbi, nm_i->dirty_nat_cnt);
/* Allow dirty nats by node block allocation in write_begin */
}
static int __get_nat_bitmaps(struct f2fs_sb_info *sbi)

1
fs/f2fs/super.c
View File

@ -1918,6 +1918,7 @@ try_onemore:
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);