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f2fs: seperate read nat page from nat_tree_lock 

This patch seperate nat page read io from nat_tree_lock.

-lock_page
	-get_node_info()
		-current_nat_addr

			......           	->       write_checkpoint

			-get_meta_page

Because we lock node page, we can make sure no other threads
modify this nid concurrently. So we just obtain current_nat_addr
under nat_tree_lock, node info is always same in both nat pack.

Signed-off-by: Yunlei He <heyunlei@huawei.com>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
hifive-unleashed-5.1
Yunlei He 2017-04-22 18:06:26 +08:00 committed by Jaegeuk Kim
parent d3bb910c15
commit 66a82d1fc7
1 changed files with 8 additions and 3 deletions
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11
fs/f2fs/node.c
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@ -376,6 +376,7 @@ void get_node_info(struct f2fs_sb_info *sbi, nid_t nid, struct node_info *ni)
struct page *page = NULL;
struct f2fs_nat_entry ne;
struct nat_entry *e;
pgoff_t index;
int i;
ni->nid = nid;
@ -401,17 +402,21 @@ void get_node_info(struct f2fs_sb_info *sbi, nid_t nid, struct node_info *ni)
node_info_from_raw_nat(ni, &ne);
}
up_read(&curseg->journal_rwsem);
if (i >= 0)
if (i >= 0) {
up_read(&nm_i->nat_tree_lock);
goto cache;
}
/* Fill node_info from nat page */
page = get_current_nat_page(sbi, start_nid);
index = current_nat_addr(sbi, nid);
up_read(&nm_i->nat_tree_lock);
page = get_meta_page(sbi, index);
nat_blk = (struct f2fs_nat_block *)page_address(page);
ne = nat_blk->entries[nid - start_nid];
node_info_from_raw_nat(ni, &ne);
f2fs_put_page(page, 1);
cache:
up_read(&nm_i->nat_tree_lock);
/* cache nat entry */
down_write(&nm_i->nat_tree_lock);
cache_nat_entry(sbi, nid, &ne);