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

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Enable iomap path for buffered IO and large folio 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: Zhang Yi yi.zhang@huawei.com --- fs/ext4/super.c | 20 ++++++++------------ 1 file changed, 8 insertions(+), 12 deletions(-)

diff --git a/fs/ext4/super.c b/fs/ext4/super.c index 292143ce354c..f9f747968a4d 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -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 +4474,9 @@ 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 */ + set_opt2(sb, BUFFERED_IOMAP); }

static int ext4_handle_clustersize(struct super_block *sb)