If the data is too close to the superblock there may be
no space for a bitmap.
If that happens, fail the adding of the bitmap rather than
corrupt data.
Reported-by: Lars Wijtemans <rhelbugzilla@lars.wijtemans.nl>
Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=922944
CREATE bbl=no
in mdadm.conf will cause any devices added to an array
to not have a bad block list. By default they do for 1.x
metadata.
This is useful if you are suspicious of the bad-block-list
implementation.
Reported-by: Ethan Wilson <ethan.wilson@shiftmail.org>
Signed-off-by: NeilBrown <neilb@suse.de>
commit 23bf42cc79
super1: simplify setting of array size.
removed the setting for sb->data_offset for 1.0 metadata for some reason,
and messed up the size calculation for 1.0 metadata too.
Signed-off-by: NeilBrown <neilb@suse.de>
Currently the extra space to leave before the data in the array
is calculated in two separate places, and they can be inconsistent.
Instead, do it all in validate_geometry. This records the
'data_offset' chosen which all other devices then use.
'write_init_super' now just uses the value rather than doing all the
calculations again.
This results in more consistent numbers.
Also, load_super sets st->data_offset so that it is used by "--add",
so the new device has a data offset matching a pre-existing device.
Signed-off-by: NeilBrown <neilb@suse.de>
_avail_space1() is calls from both avail_space1() and validate_geometry1()
and does slightly different things.
The partial code sharing doesn't really help. In particularly the
responsibility for setting the size of the array is currently
confused.
So duplicate the code into the two locations - one where 'super' is
always NULL (validate_geometry1) and one where it is never NULL
(avail_space1), and simplify.
No behaviour change - just code re-organisation.
Signed-off-by: NeilBrown <neilb@suse.de>
This call to validate_geometry is really rather gratuitous.
It is purely about the fact that super0 cannot use more than 4TB.
So just make it an explicit test - less confusing that way.
With this, validate_geometry is only called from Create, which
makes it easier to reason about.
Also validate_geometry is now never passed NULL for the 'chunk'
parameter, so we can remove those annoying tests for NULL.
Signed-off-by: NeilBrown <neilb@suse.de>
The "data_size" is with respect to "data_offset". When the kernel
changes "data_offset" it modifies "data_size" to match - see
md_finish_reshape() in the kernel.
So when mdadm switches the data_offset for the new data_offset, it
must update data_size correspondingly.
Signed-off-by: NeilBrown <neilb@suse.de>
We can only revert a reshape if the reshape_position aligns
properly for the old geometry.
If it doesn't we just fail for now.
Also fix a +/- error with updating raid_disks for super1.c
Signed-off-by: NeilBrown <neilb@suse.de>
We need to check for a backup iff the data_offset has changed.
Testing against level==10 was an effective but short-sighted approach.
Signed-off-by: NeilBrown <neilb@suse.de>
This allows the smooth conversion of legacy 0.90 arrays
to 1.0 metadata.
Old metadata is likely to remain but will be ignored.
It can be removed with
mdadm --zero-superblock --metadata=0.90 /dev/whatever
Signed-off-by: NeilBrown <neilb@suse.de>
These need to be cast to uint32_t before being cast to 'long', else
sign extension doesn't happen on 64bit hosts.
And bitmap_offset is le32, not le64 !!
Signed-off-by: NeilBrown <neilb@suse.de>
It seems like a nice location, but it means that we cannot
decrease the data_offset during a reshape.
So put it just after the bitmap, leaving 32K.
Signed-off-by: NeilBrown <neilb@suse.de>
If space_after and space_before are zero (the default) then assume that
metadata doesn't support changing data_offset.
Signed-off-by: NeilBrown <neilb@suse.de>
1/ these must allow for bad-block-list
2/ they must match the kernel, which has a 32k buffer after the
superblock.
Signed-off-by: NeilBrown <neilb@suse.de>
This allows the metadata on a device to be saved and later restored.
This can be useful before experimenting on an array that is misbehaving.
Suggested-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: NeilBrown <neilb@suse.de>
We widely use a "devnum" which is 0 or +ve for md%d devices
and -ve for md_d%d devices.
But I want to be able to use md_%s device names.
So get rid of devnum (a number) and use devnm (a 32char string).
eg.
md0
md_d2
md_home
Signed-off-by: NeilBrown <neilb@suse.de>
Commit 1e2b276535 (Report error in --update
string is not recognised) broke homehost updating functionality because it
depended on each string comparison being done even after we already found
a match. Make it work again by restructuring code.
Reported-by: (and original version by) Justin Maggard <jmaggard10@gmail.com>
Signed-off-by: NeilBrown <neilb@suse.de>
Now that we use O_DIRECT for all device IO, BLKFLSBUF is not needed to
ensure we get current data, and it can impose a cost if any flush-out
is needed. So remove it.
To be safe, add O_DIRECT to one place where it isn't currently used:
when reading a bitmap.
Signed-off-by: NeilBrown <neilb@suse.de>
--detail needs to be read to report 2 devices in each slot,
and --examine need to report if the device is the original or
the replacement.
Signed-off-by: NeilBrown <neilb@suse.de>
mdadm --create /dev/md0 .... /dev/sda1:1024 /dev/sdb1:2048 ...
The size is in K unless a suffix: K M G is given.
The suffix 's' means sectors.
Signed-off-by: NeilBrown <neilb@suse.de>
sometimes 0.1% isn't enough, though mostly only in testing.
We need one chunk for a successful reshape, so reserve 2.
Signed-off-by: NeilBrown <neilb@suse.de>
Some arrays (raid10) never need a backup file, so during assembly
we can avoid the whole Grow_continue check in that case.
Achieve this using a flag set by the metadata handler.
Also get "mdadm -I" to fail if a backup process would be
needed. It currently does fail as the kernel rejects things,
but it is nicer to have this explicit.
Signed-off-by: NeilBrown <neilb@suse.de>
The 'new_offset' is used for reshaping to avoid the need
for a backup file.
For now we only report the value when it is set.
Signed-off-by: NeilBrown <neilb@suse.de>
This is currently only useful for 1.x metadata and will allow an
explicit --data-offset request on command line.
Signed-off-by: NeilBrown <neilb@suse.de>
1/ When printing the "name=" entry for --brief output,
enclose name in quotes if it contains spaces etc.
Quotes are already supported for reading mdadm.conf
2/ When a name is used as a device name, translate spaces
and tabs to '_', as well as the current translation of
'/' to '-'.
Signed-off-by: NeilBrown <neilb@suse.de>
--update=bbl will add a bad block list to each device.
--update=no-bblk will remove the bad block list providing that it
is empty.
Signed-off-by: NeilBrown <neilb@suse.de>
An additional pair of key=value for --examine --export.
Signed-off-by: Maciej Naruszewicz <maciej.naruszewicz@intel.com>
Signed-off-by: NeilBrown <neilb@suse.de>
If we change some functions to accept 'verbose', where <0 means to be
quiet, in place of 'quiet', then we will be able to merge
'quiet' and 'verbose' together for simplicity.
Signed-off-by: NeilBrown <neilb@suse.de>
NeilBrown
Cristian Rodríguez
Maciej Naruszewicz