diff mbox series

f2fs: no need to take page lock in readdir

Message ID 20190221045735.45419-1-gaoxiang25@huawei.com (mailing list archive)
State New, archived
Headers show
Series f2fs: no need to take page lock in readdir | expand

Commit Message

Gao Xiang Feb. 21, 2019, 4:57 a.m. UTC 
VFS will take inode_lock for readdir, therefore no need to
take page lock in readdir at all just as the majority of
other generic filesystems.

This patch improves concurrency since .iterate_shared
was introduced to VFS years ago.

Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
---

 personally tend to use read_mapping_page here, but it seems
 that f2fs has some remaining customized code since it was
 merged into Linux, use f2fs_find_data_page instead.

 fs/f2fs/dir.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

Comments

Chao Yu Feb. 27, 2019, 12:44 p.m. UTC | #1 
On 2019/2/21 12:57, Gao Xiang wrote:
> VFS will take inode_lock for readdir, therefore no need to
> take page lock in readdir at all just as the majority of
> other generic filesystems.
> 
> This patch improves concurrency since .iterate_shared
> was introduced to VFS years ago.
> 
> Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>

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

Thanks,
diff mbox series

Patch

diff --git a/fs/f2fs/dir.c b/fs/f2fs/dir.c
index ecc3a4e2be96..64602bc1e092 100644
--- a/fs/f2fs/dir.c
+++ b/fs/f2fs/dir.c
@@ -873,7 +873,7 @@  static int f2fs_readdir(struct file *file, struct dir_context *ctx)
 			page_cache_sync_readahead(inode->i_mapping, ra, file, n,
 				min(npages - n, (pgoff_t)MAX_DIR_RA_PAGES));
 
-		dentry_page = f2fs_get_lock_data_page(inode, n, false);
+		dentry_page = f2fs_find_data_page(inode, n);
 		if (IS_ERR(dentry_page)) {
 			err = PTR_ERR(dentry_page);
 			if (err == -ENOENT) {
@@ -891,11 +891,11 @@  static int f2fs_readdir(struct file *file, struct dir_context *ctx)
 		err = f2fs_fill_dentries(ctx, &d,
 				n * NR_DENTRY_IN_BLOCK, &fstr);
 		if (err) {
-			f2fs_put_page(dentry_page, 1);
+			f2fs_put_page(dentry_page, 0);
 			break;
 		}
 
-		f2fs_put_page(dentry_page, 1);
+		f2fs_put_page(dentry_page, 0);
 	}
 out_free:
 	fscrypt_fname_free_buffer(&fstr);