Commit e1293bdf authored by Chao Yu's avatar Chao Yu Committed by Jaegeuk Kim
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f2fs: plug readahead IO in readdir() 



Add a plug to merge readahead IO in readdir(), expecting it can
reduce bio count before submitting to block layer.

Signed-off-by: default avatarChao Yu <yuchao0@huawei.com>
Signed-off-by: default avatarJaegeuk Kim <jaegeuk@kernel.org>
parent 042be0f8

fs/f2fs/dir.c

+16 −6
Original line number Diff line number Diff line
@@ -784,9 +784,15 @@ int f2fs_fill_dentries(struct dir_context *ctx, struct f2fs_dentry_ptr *d, 
	struct f2fs_dir_entry *de = NULL;

	struct fscrypt_str de_name = FSTR_INIT(NULL, 0);

	struct f2fs_sb_info *sbi = F2FS_I_SB(d->inode);

	struct blk_plug plug;

	bool readdir_ra = sbi->readdir_ra == 1;

	int err = 0;



	bit_pos = ((unsigned long)ctx->pos % d->max);



	if (readdir_ra)

		blk_start_plug(&plug);



	while (bit_pos < d->max) {

		bit_pos = find_next_bit_le(d->bitmap, d->max, bit_pos);

		if (bit_pos >= d->max)
@@ -806,29 +812,33 @@ int f2fs_fill_dentries(struct dir_context *ctx, struct f2fs_dentry_ptr *d, 


		if (f2fs_encrypted_inode(d->inode)) {

			int save_len = fstr->len;

			int err;



			err = fscrypt_fname_disk_to_usr(d->inode,

						(u32)de->hash_code, 0,

						&de_name, fstr);

			if (err)

				return err;

				goto out;



			de_name = *fstr;

			fstr->len = save_len;

		}



		if (!dir_emit(ctx, de_name.name, de_name.len,

					le32_to_cpu(de->ino), d_type))

			return 1;

					le32_to_cpu(de->ino), d_type)) {

			err = 1;

			goto out;

		}



		if (sbi->readdir_ra == 1)

		if (readdir_ra)

			f2fs_ra_node_page(sbi, le32_to_cpu(de->ino));



		bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len));

		ctx->pos = start_pos + bit_pos;

	}

	return 0;

out:

	if (readdir_ra)

		blk_finish_plug(&plug);

	return err;

}



static int f2fs_readdir(struct file *file, struct dir_context *ctx)