Add the data_alloc_zone_blocks volume option. This changes the
behaviour of the server to try and give mounts free data extents which
fall in exclusive fixed-size zones.
We add the field to the scoutfs_volume_options struct and add it to the
set_volopt server handler which enforces constrains on the size of the
zones.
We then add fields to the log_trees struct which records the size of the
zones and sets bits for the zones that contain free extents in the
data_avail allocator root. The get_log_trees handler is changed to read
all the zone bitmaps from all the items, pass those bitmaps in to
_alloc_move to direct data allocations, and finally update the bitmaps
in the log_trees items to cover the newly allocated extents. The
log_trees data_alloc_zone fields are cleared as the mount's logs are
reclaimed to indicate that the mount is no longer writing to the zone.
The policy mechanism of finding free extents based on the bitmaps is
ipmlemented down in _data_alloc_move().
Signed-off-by: Zach Brown <zab@versity.com>
Introduce global volume options. They're stored in the superblock and
can be seen in sysfs files that use network commands to get and
set the options on the server.
Signed-off-by: Zach Brown <zab@versity.com>
Update the man pages with descriptions of the new mkfs -Q quorum slot
configuration and quorum_slot_nr mount option.
Signed-off-by: Zach Brown <zab@versity.com>
Update for cli args and options changes. Reorder subcommands to match
scoutfs built-in help.
Consistent ScoutFS capitalization.
Tighten up some descriptions and verbiage for consistency and omit
descriptions of internals in a few spots.
Add SEE ALSO for blockdev(8) and wipefs(8).
Signed-off-by: Andy Grover <agrover@versity.com>
mkfs: Take two block devices as arguments. Write everything to metadata
dev, and the superblock to the data dev. UUIDs match. Differentiate by
checking a bit in a new "flags" field in the superblock.
Refactor device_size() a little. Convert spaces to tabs.
Move code to pretty-print sizes to dev.c so we can use it in error
messages there, as well as in mkfs.c.
print: Include flags in output.
Add -D and -M options for setting max dev sizes
Allow sizes to be specified using units like "K", "G" etc.
Note: -D option replaces -S option, and uses above units rather than
the number of 4k data blocks.
Update man pages for cmdline changes.
Signed-off-by: Andy Grover <agrover@versity.com>
Remove the definitions and descriptions of sources of corruption that
are no longer identified by the kernel module.
Signed-off-by: Zach Brown <zab@versity.com>
Update the format header and add a man page which describes the
corruption messages that the kernel module can spit out.
Signed-off-by: Zach Brown <zab@versity.com>
