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Make vg->mda_copies persistent in on disk vg metadata.
This patch adds the ability to read/write the vg->mda_copies values from/to the vg metadata. If we read the VG metadata and this field does not exist, we set mda_copies to the default value of 0. Later in the code, we use this special '0' value to indicate a disable of metadata balancing. This should preserve existing LVM behavior and ensure metadata balancing can be turned off should the need arise. Signed-off-by: Dave Wysochanski <dwysocha@redhat.com>
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@ -397,6 +397,7 @@ static int _print_vg(struct formatter *f, struct volume_group *vg)
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outf(f, "allocation_policy = \"%s\"",
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get_alloc_string(vg->alloc));
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}
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outf(f, "metadata_copies = %u", vg->mda_copies);
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return 1;
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}
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@ -23,6 +23,7 @@
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#include "pv_alloc.h"
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#include "segtype.h"
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#include "text_import.h"
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#include "defaults.h"
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typedef int (*section_fn) (struct format_instance * fid, struct dm_pool * mem,
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struct volume_group * vg, struct config_node * pvn,
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@ -745,6 +746,10 @@ static struct volume_group *_read_vg(struct format_instance *fid,
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return_0;
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}
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if (!_read_uint32(vgn, "metadata_copies", &vg->mda_copies)) {
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vg->mda_copies = DEFAULT_VGMETADATACOPIES;
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}
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/*
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* The pv hash memorises the pv section names -> pv
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* structures.
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