The original i_version implementation was pretty expensive, requiring a
log flush on every change. Because of this, it was gated behind a mount
option (implemented via the MS_I_VERSION mountoption flag).
Commit ae5e165d855d (fs: new API for handling inode->i_version) made the
i_version flag much less expensive, so there is no longer a performance
penalty from enabling it. xfs and btrfs already enable it
unconditionally when the on-disk format can support it.
Have ext4 ignore the SB_I_VERSION flag, and just enable it
unconditionally. While we're in here, remove the handling of
Opt_i_version as well, since we're almost to 5.20 anyway.
Ideally, we'd couple this change with a way to disable the i_version
counter (just in case), but the way the iversion mount option was
implemented makes that difficult to do. We'd need to add a new mount
option altogether or do something with tune2fs. That's probably best
left to later patches if it turns out to be needed.
Cc: Dave Chinner <david@xxxxxxxxxxxxx>
Cc: Lukas Czerner <lczerner@xxxxxxxxxx>
Cc: Benjamin Coddington <bcodding@xxxxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Cc: Darrick J. Wong <djwong@xxxxxxxxxx>
Signed-off-by: Jeff Layton <jlayton@xxxxxxxxxx>
---
fs/ext4/inode.c | 5 ++---
fs/ext4/super.c | 13 ++++---------
2 files changed, 6 insertions(+), 12 deletions(-)
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 84c0eb55071d..c785c0b72116 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -5411,7 +5411,7 @@ int ext4_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
return -EINVAL;
}
- if (IS_I_VERSION(inode) && attr->ia_size != inode->i_size)
+ if (attr->ia_size != inode->i_size)
inode_inc_iversion(inode);
if (shrink) {
@@ -5717,8 +5717,7 @@ int ext4_mark_iloc_dirty(handle_t *handle,
}
ext4_fc_track_inode(handle, inode);
- if (IS_I_VERSION(inode))
- inode_inc_iversion(inode);
+ inode_inc_iversion(inode);
/* the do_update_inode consumes one bh->b_count */
get_bh(iloc->bh);
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 845f2f8aee5f..4b06f394d7d1 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -1585,7 +1585,7 @@ enum {
Opt_inlinecrypt,
Opt_usrjquota, Opt_grpjquota, Opt_quota,
Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err,
- Opt_usrquota, Opt_grpquota, Opt_prjquota, Opt_i_version,
+ Opt_usrquota, Opt_grpquota, Opt_prjquota,
Opt_dax, Opt_dax_always, Opt_dax_inode, Opt_dax_never,
Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_warn_on_error,
Opt_nowarn_on_error, Opt_mblk_io_submit, Opt_debug_want_extra_isize,
@@ -1694,7 +1694,6 @@ static const struct fs_parameter_spec ext4_param_specs[] = {
fsparam_flag ("barrier", Opt_barrier),
fsparam_u32 ("barrier", Opt_barrier),
fsparam_flag ("nobarrier", Opt_nobarrier),
- fsparam_flag ("i_version", Opt_i_version),
fsparam_flag ("dax", Opt_dax),
fsparam_enum ("dax", Opt_dax_type, ext4_param_dax),
fsparam_u32 ("stripe", Opt_stripe),
@@ -2140,11 +2139,6 @@ static int ext4_parse_param(struct fs_context *fc, struct fs_parameter *param)
case Opt_abort:
ctx_set_mount_flag(ctx, EXT4_MF_FS_ABORTED);
return 0;
- case Opt_i_version:
- ext4_msg(NULL, KERN_WARNING, deprecated_msg, param->key, "5.20");
- ext4_msg(NULL, KERN_WARNING, "Use iversion instead\n");
- ctx_set_flags(ctx, SB_I_VERSION);
- return 0;
case Opt_inlinecrypt:
#ifdef CONFIG_FS_ENCRYPTION_INLINE_CRYPT
ctx_set_flags(ctx, SB_INLINECRYPT);
@@ -2970,8 +2964,6 @@ static int _ext4_show_options(struct seq_file *seq, struct super_block *sb,
SEQ_OPTS_PRINT("min_batch_time=%u", sbi->s_min_batch_time);
if (nodefs || sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME)
SEQ_OPTS_PRINT("max_batch_time=%u", sbi->s_max_batch_time);
- if (sb->s_flags & SB_I_VERSION)
- SEQ_OPTS_PUTS("i_version");
if (nodefs || sbi->s_stripe)
SEQ_OPTS_PRINT("stripe=%lu", sbi->s_stripe);
if (nodefs || EXT4_MOUNT_DATA_FLAGS &
@@ -4630,6 +4622,9 @@ static int __ext4_fill_super(struct fs_context *fc, struct super_block *sb)
sb->s_flags = (sb->s_flags & ~SB_POSIXACL) |
(test_opt(sb, POSIX_ACL) ? SB_POSIXACL : 0);
+ /* i_version is always enabled now */
+ sb->s_flags |= SB_I_VERSION;
+
if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
(ext4_has_compat_features(sb) ||
ext4_has_ro_compat_features(sb) ||
--
2.37.1
