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Grow: reject raid-disks reduction in RAID5 etc before 2.6.32 

2.6.31 has some bugs with restarting a RAID5 reduction, so
refuse to try unless at least 2.6.32.

Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
NeilBrown 2009-10-20 16:36:03 +11:00
parent ea0ebe9685
commit 24d40069d7
1 changed files with 9 additions and 1 deletions
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10
Grow.c
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@ -523,6 +523,14 @@ int Grow_reshape(char *devname, int fd, int quiet, char *backup_file,
devname);
return 1;
}
if (raid_disks && raid_disks < array.raid_disks && array.level > 1 &&
get_linux_version() < 2006032 &&
!check_env("MDADM_FORCE_FEWER")) {
fprintf(stderr, Name ": reducing the number of devices is not safe before Linux 2.6.32\n"
" Please use a newer kernel\n");
return 1;
}
sra = sysfs_read(fd, 0, GET_LEVEL);
frozen = freeze_array(sra);
if (frozen < 0) {
@ -627,7 +635,7 @@ int Grow_reshape(char *devname, int fd, int quiet, char *backup_file,
}
}
if (raid_disks)
/* The find raid6->raid5 conversion
/* The final raid6->raid5 conversion
* will reduce the number of disks,
* so now we need to aim higher
*/