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xfs: add a max_open_zones mount option

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Allow limiting the number of open zones used below that exported by the
device.  This is required to tune the number of write streams when zoned
RT devices are used on conventional devices, and can be useful on zoned
devices that support a very large number of open zones.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: "Darrick J. Wong" <djwong@kernel.org>
This commit is contained in:
Christoph Hellwig 2024-11-17 08:05:16 +01:00
parent 97c69ba1c0
commit 7452a6daf9
1 changed files with 16 additions and 1 deletions
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17
fs/xfs/xfs_super.c
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@ -110,7 +110,7 @@ enum {
Opt_filestreams, Opt_quota, Opt_noquota, Opt_usrquota, Opt_grpquota,
Opt_prjquota, Opt_uquota, Opt_gquota, Opt_pquota,
Opt_uqnoenforce, Opt_gqnoenforce, Opt_pqnoenforce, Opt_qnoenforce,
Opt_discard, Opt_nodiscard, Opt_dax, Opt_dax_enum,
Opt_discard, Opt_nodiscard, Opt_dax, Opt_dax_enum, Opt_max_open_zones,
};
static const struct fs_parameter_spec xfs_fs_parameters[] = {
@ -155,6 +155,7 @@ static const struct fs_parameter_spec xfs_fs_parameters[] = {
fsparam_flag("nodiscard", Opt_nodiscard),
fsparam_flag("dax", Opt_dax),
fsparam_enum("dax", Opt_dax_enum, dax_param_enums),
fsparam_u32("max_open_zones", Opt_max_open_zones),
{}
};
@ -234,6 +235,9 @@ xfs_fs_show_options(
if (!(mp->m_qflags & XFS_ALL_QUOTA_ACCT))
seq_puts(m, ",noquota");
if (mp->m_max_open_zones)
seq_printf(m, ",max_open_zones=%u", mp->m_max_open_zones);
return 0;
}
@ -1081,6 +1085,14 @@ xfs_finish_flags(
return -EINVAL;
}
if (!xfs_has_zoned(mp)) {
if (mp->m_max_open_zones) {
xfs_warn(mp,
"max_open_zones mount option only supported on zoned file systems.");
return -EINVAL;
}
}
return 0;
}
@ -1463,6 +1475,9 @@ xfs_fs_parse_param(
xfs_fs_warn_deprecated(fc, param, XFS_FEAT_NOATTR2, true);
parsing_mp->m_features |= XFS_FEAT_NOATTR2;
return 0;
case Opt_max_open_zones:
parsing_mp->m_max_open_zones = result.uint_32;
return 0;
default:
xfs_warn(parsing_mp, "unknown mount option [%s].", param->key);
return -EINVAL;