RepoMirrors
/
btrfs-progs
mirror of https://github.com/kdave/btrfs-progs
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

btrfs-progs: zoned: add upper and lower zone size boundaries 

As we're not supporting arbitrarily big or small zone sizes in the kernel,
reject devices that don't fit in progs as well.

Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Johannes Thumshirn 2022-02-10 05:49:00 -08:00 committed by David Sterba
parent a234524c95
commit a7ae6d5948
2 changed files with 21 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
Documentation/ch-zoned-intro.rst
View File

@ -19,6 +19,7 @@ Requirements, limitations
* all devices must have the same zone size
* maximum zone size is 8GiB
* minimum zone size is 4MiB
* mixing zoned and non-zoned devices is possible, the zone writes are emulated,
but this is namely for testing
* the super block is handled in a special way and is at different locations than on a non-zoned filesystem:

20
kernel-shared/zoned.c
View File

@ -35,6 +35,15 @@
#define EMULATED_ZONE_SIZE SZ_256M
/*
* Minimum / maximum supported zone size. Currently, SMR disks have a zone size
* of 256MiB, and we are expecting ZNS drives to be in the 1-4GiB range. We do
* not expect the zone size to become larger than 8GiB or smaller than 4MiB in
* the near future.
*/
#define BTRFS_MAX_ZONE_SIZE (8ULL * SZ_1G)
#define BTRFS_MIN_ZONE_SIZE (SZ_4M)
static int btrfs_get_dev_zone_info(struct btrfs_device *device);
enum btrfs_zoned_model zoned_model(const char *file)
@ -274,6 +283,17 @@ static int report_zones(int fd, const char *file,
/* Allocate the zone information array */
zinfo->zone_size = zone_bytes;
zinfo->nr_zones = device_size / zone_bytes;
if (zinfo->zone_size > BTRFS_MAX_ZONE_SIZE) {
error("zoned: zone size %llu larger than supported maximum %llu",
zinfo->zone_size, BTRFS_MAX_ZONE_SIZE);
exit(1);
} else if (zinfo->zone_size < BTRFS_MIN_ZONE_SIZE) {
error("zoned: zone size %llu smaller than supported minimum %u",
zinfo->zone_size, BTRFS_MIN_ZONE_SIZE);
exit(1);
}
if (device_size & (zone_bytes - 1))
zinfo->nr_zones++;