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From fea026b4849182fc8413014c81456e7215af28d9 Mon Sep 17 00:00:00 2001
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From: Mateusz Kusiak <mateusz.kusiak@intel.com>
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Date: Wed, 23 Mar 2022 15:05:19 +0100
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Subject: [PATCH 03/12] Grow_reshape: Add r0 grow size error message and update
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man
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Grow size on r0 is not supported for imsm and native metadata.
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Add proper error message.
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Update man for proper use of --size.
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Signed-off-by: Mateusz Kusiak <mateusz.kusiak@intel.com>
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Signed-off-by: Jes Sorensen <jsorensen@fb.com>
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---
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Grow.c | 6 ++++++
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mdadm.8.in | 19 ++++++++++++-------
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2 files changed, 18 insertions(+), 7 deletions(-)
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diff --git a/Grow.c b/Grow.c
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index 9a947204..aa72490b 100644
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--- a/Grow.c
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+++ b/Grow.c
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@@ -1998,6 +1998,12 @@ int Grow_reshape(char *devname, int fd,
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goto release;
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}
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+ if (array.level == 0) {
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+ pr_err("Component size change is not supported for RAID0\n");
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+ rv = 1;
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+ goto release;
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+ }
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+
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if (reshape_super(st, s->size, UnSet, UnSet, 0, 0, UnSet, NULL,
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devname, APPLY_METADATA_CHANGES,
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c->verbose > 0)) {
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diff --git a/mdadm.8.in b/mdadm.8.in
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index be902dba..e2a42425 100644
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--- a/mdadm.8.in
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+++ b/mdadm.8.in
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@@ -459,7 +459,8 @@ number of spare devices.
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.TP
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.BR \-z ", " \-\-size=
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-Amount (in Kilobytes) of space to use from each drive in RAID levels 1/4/5/6.
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+Amount (in Kilobytes) of space to use from each drive in RAID levels 1/4/5/6/10
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+and for RAID 0 on external metadata.
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This must be a multiple of the chunk size, and must leave about 128Kb
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of space at the end of the drive for the RAID superblock.
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If this is not specified
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@@ -478,10 +479,19 @@ To guard against this it can be useful to set the initial size
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slightly smaller than the smaller device with the aim that it will
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still be larger than any replacement.
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+This option can be used with
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+.B \-\-create
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+for determining initial size of an array. For external metadata,
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+it can be used on a volume, but not on a container itself.
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+Setting initial size of
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+.B RAID 0
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+array is only valid for external metadata.
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+
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This value can be set with
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.B \-\-grow
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-for RAID level 1/4/5/6 though
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+for RAID level 1/4/5/6/10 though
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DDF arrays may not be able to support this.
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+RAID 0 array size cannot be changed.
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If the array was created with a size smaller than the currently
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active drives, the extra space can be accessed using
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.BR \-\-grow .
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@@ -501,11 +511,6 @@ problems the array can be made bigger again with no loss with another
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.B "\-\-grow \-\-size="
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command.
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-This value cannot be used when creating a
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-.B CONTAINER
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-such as with DDF and IMSM metadata, though it perfectly valid when
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-creating an array inside a container.
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-
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.TP
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.BR \-Z ", " \-\-array\-size=
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This is only meaningful with
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--
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2.31.1
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