Commit 35c3d7ab authored by Zhang Yi's avatar Zhang Yi
Browse files

ext4: default enable iomap for buffered IO and large folio 

hulk inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I9PXA8


CVE: NA

--------------------------------

Enable iomap path for buffered IO and large folio on 4k pagesize by
default, and allow switching iomap path and buffered_head path through
remount. The path switch doesn't take effect until the activing inodes
destroyed.

Signed-off-by: default avatarZhang Yi <yi.zhang@huawei.com>
parent f3f94073

fs/ext4/super.c

+9 −12
Original line number Diff line number Diff line
@@ -1738,7 +1738,8 @@ enum { 
	Opt_dioread_nolock, Opt_dioread_lock,

	Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,

	Opt_max_dir_size_kb, Opt_nojournal_checksum, Opt_nombcache,

	Opt_no_prefetch_block_bitmaps, Opt_mb_optimize_scan, Opt_buffered_iomap,

	Opt_no_prefetch_block_bitmaps, Opt_mb_optimize_scan,

	Opt_buffered_iomap, Opt_nobuffered_iomap,

	Opt_errors, Opt_data, Opt_data_err, Opt_jqfmt, Opt_dax_type,

#ifdef CONFIG_EXT4_DEBUG

	Opt_fc_debug_max_replay, Opt_fc_debug_force
@@ -1882,6 +1883,7 @@ static const struct fs_parameter_spec ext4_param_specs[] = { 
						Opt_no_prefetch_block_bitmaps),

	fsparam_s32	("mb_optimize_scan",	Opt_mb_optimize_scan),

	fsparam_flag	("buffered_iomap",	Opt_buffered_iomap),

	fsparam_flag	("nobuffered_iomap",	Opt_nobuffered_iomap),

	fsparam_string	("check",		Opt_removed),	/* mount option from ext2/3 */

	fsparam_flag	("nocheck",		Opt_removed),	/* mount option from ext2/3 */

	fsparam_flag	("reservation",		Opt_removed),	/* mount option from ext2/3 */
@@ -1978,6 +1980,8 @@ static const struct mount_opts { 
	 MOPT_SET},

	{Opt_buffered_iomap, EXT4_MOUNT2_BUFFERED_IOMAP,

	 MOPT_SET | MOPT_2 | MOPT_EXT4_ONLY},

	{Opt_nobuffered_iomap, EXT4_MOUNT2_BUFFERED_IOMAP,

	 MOPT_CLEAR | MOPT_2 | MOPT_EXT4_ONLY},

#ifdef CONFIG_EXT4_DEBUG

	{Opt_fc_debug_force, EXT4_MOUNT2_JOURNAL_FAST_COMMIT,

	 MOPT_SET | MOPT_2 | MOPT_EXT4_ONLY},
@@ -2464,11 +2468,6 @@ static int ext4_parse_param(struct fs_context *fc, struct fs_parameter *param) 
			return -EINVAL;

		}

		return 0;

	case Opt_buffered_iomap:

		ext4_msg(NULL, KERN_WARNING,

			 "iomap for buffered enabled. Warning: EXPERIMENTAL, use at your own risk");

		ctx_set_mount_opt2(ctx, EXT4_MOUNT2_BUFFERED_IOMAP);

		return 0;

	}



	/*
@@ -2908,12 +2907,6 @@ static int ext4_check_opt_consistency(struct fs_context *fc, 
			    !(sbi->s_mount_opt2 & EXT4_MOUNT2_DAX_INODE))) {

			goto fail_dax_change_remount;

		}



		if (ctx_test_mount_opt2(ctx, EXT4_MOUNT2_BUFFERED_IOMAP) &&

		    !test_opt2(sb, BUFFERED_IOMAP)) {

			ext4_msg(NULL, KERN_ERR, "can't enable iomap for buffered IO on remount");

			return -EINVAL;

		}

	}



	return ext4_check_quota_consistency(fc, sb);
@@ -4481,6 +4474,10 @@ static void ext4_set_def_opts(struct super_block *sb, 


	if (sb->s_blocksize == PAGE_SIZE)

		set_opt(sb, DIOREAD_NOLOCK);



	/* Use iomap for buffered IO path on 4k pagesize */

	if (PAGE_SIZE == SZ_4K)

		set_opt2(sb, BUFFERED_IOMAP);

}



static int ext4_handle_clustersize(struct super_block *sb)