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fs/xfs: Make DAX mount option a tri-state

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As agreed upon[1].  We make the dax mount option a tri-state.  '-o dax'
continues to operate the same.  We add 'always', 'never', and 'inode'
(default).

[1] https://lore.kernel.org/lkml/20200405061945.GA94792@iweiny-DESK2.sc.intel.com/

Signed-off-by: Ira Weiny <ira.weiny@intel.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
This commit is contained in:
Ira Weiny 2020-04-30 07:41:35 -07:00 committed by Darrick J. Wong
parent fd58c62b65
commit 02beb2686f
2 changed files with 43 additions and 4 deletions
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1
fs/xfs/xfs_mount.h
View file

@ -238,6 +238,7 @@ typedef struct xfs_mount {
allocator */
#define XFS_MOUNT_NOATTR2 (1ULL << 25) /* disable use of attr2 format */
#define XFS_MOUNT_DAX_ALWAYS (1ULL << 26)
#define XFS_MOUNT_DAX_NEVER (1ULL << 27)
/*
* Max and min values for mount-option defined I/O

46
fs/xfs/xfs_super.c
View file

@ -47,6 +47,39 @@ static struct kset *xfs_kset; /* top-level xfs sysfs dir */
static struct xfs_kobj xfs_dbg_kobj; /* global debug sysfs attrs */
#endif
enum xfs_dax_mode {
XFS_DAX_INODE = 0,
XFS_DAX_ALWAYS = 1,
XFS_DAX_NEVER = 2,
};
static void
xfs_mount_set_dax_mode(
struct xfs_mount *mp,
enum xfs_dax_mode mode)
{
switch (mode) {
case XFS_DAX_INODE:
mp->m_flags &= ~(XFS_MOUNT_DAX_ALWAYS | XFS_MOUNT_DAX_NEVER);
break;
case XFS_DAX_ALWAYS:
mp->m_flags |= XFS_MOUNT_DAX_ALWAYS;
mp->m_flags &= ~XFS_MOUNT_DAX_NEVER;
break;
case XFS_DAX_NEVER:
mp->m_flags |= XFS_MOUNT_DAX_NEVER;
mp->m_flags &= ~XFS_MOUNT_DAX_ALWAYS;
break;
}
}
static const struct constant_table dax_param_enums[] = {
{"inode", XFS_DAX_INODE },
{"always", XFS_DAX_ALWAYS },
{"never", XFS_DAX_NEVER },
{}
};
/*
* Table driven mount option parser.
*/
@ -59,7 +92,7 @@ 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_discard, Opt_nodiscard, Opt_dax, Opt_dax_enum,
};
static const struct fs_parameter_spec xfs_fs_parameters[] = {
@ -103,6 +136,7 @@ static const struct fs_parameter_spec xfs_fs_parameters[] = {
fsparam_flag("discard", Opt_discard),
fsparam_flag("nodiscard", Opt_nodiscard),
fsparam_flag("dax", Opt_dax),
fsparam_enum("dax", Opt_dax_enum, dax_param_enums),
{}
};
@ -129,7 +163,8 @@ xfs_fs_show_options(
{ XFS_MOUNT_GRPID, ",grpid" },
{ XFS_MOUNT_DISCARD, ",discard" },
{ XFS_MOUNT_LARGEIO, ",largeio" },
{ XFS_MOUNT_DAX_ALWAYS, ",dax" },
{ XFS_MOUNT_DAX_ALWAYS, ",dax=always" },
{ XFS_MOUNT_DAX_NEVER, ",dax=never" },
{ 0, NULL }
};
struct xfs_mount *mp = XFS_M(root->d_sb);
@ -1261,7 +1296,10 @@ xfs_fc_parse_param(
return 0;
#ifdef CONFIG_FS_DAX
case Opt_dax:
mp->m_flags |= XFS_MOUNT_DAX_ALWAYS;
xfs_mount_set_dax_mode(mp, XFS_DAX_ALWAYS);
return 0;
case Opt_dax_enum:
xfs_mount_set_dax_mode(mp, result.uint_32);
return 0;
#endif
default:
@ -1468,7 +1506,7 @@ xfs_fc_fill_super(
if (!rtdev_is_dax && !datadev_is_dax) {
xfs_alert(mp,
"DAX unsupported by block device. Turning off DAX.");
mp->m_flags &= ~XFS_MOUNT_DAX_ALWAYS;
xfs_mount_set_dax_mode(mp, XFS_DAX_NEVER);
}
if (xfs_sb_version_hasreflink(&mp->m_sb)) {
xfs_alert(mp,