Grow: do not allow size changes with other changes.
A change the reduces the size of an array always happens before any other change. So it can cause data to be lost. By themselves these changes are reversible. But once another change has started, the data would be permanently lost. So recommend data integrity be checked between a size change and any other change. Signed-off-by: NeilBrown <neilb@suse.de>
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parent
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9ce510be9c
9
Grow.c
9
Grow.c
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@ -524,6 +524,15 @@ int Grow_reshape(char *devname, int fd, int quiet, char *backup_file,
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return 1;
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}
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if (size >= 0 &&
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(chunksize || level!= UnSet || layout_str || raid_disks)) {
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fprintf(stderr, Name ": cannot change component size at the same time "
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"as other changes.\n"
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" Change size first, then check data is intact before "
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"making other changes.\n");
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return 1;
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}
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if (raid_disks && raid_disks < array.raid_disks && array.level > 1 &&
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get_linux_version() < 2006032 &&
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!check_env("MDADM_FORCE_FEWER")) {
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9
mdadm.c
9
mdadm.c
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@ -1417,9 +1417,18 @@ int main(int argc, char *argv[])
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if (array_size >= 0) {
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/* alway impose array size first, independent of
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* anything else
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* Do not allow level or raid_disks changes at the
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* same time as that can be irreversibly destructive.
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*/
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struct mdinfo sra;
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int err;
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if (raiddisks || level != UnSet) {
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fprintf(stderr, Name ": cannot change array size in same operation "
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"as changing raiddisks or level.\n"
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" Change size first, then check that data is still intact.\n");
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rv = 1;
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break;
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}
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sysfs_init(&sra, mdfd, 0);
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if (array_size == 0)
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err = sysfs_set_str(&sra, NULL, "array_size", "default");
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