Hello,
one more thing: I just overwrote part of one disk.
"btrfs filesystem show" could be more helpful diagnosing this:
# btrfs fi sh
Label: 'BTRFSROOT' uuid: d877125e-9b8d-47ea-b57b-7411292fd26c
Total devices 1 FS bytes used 2.91GiB
devid 1 size 29.44GiB used 5.04GiB path /dev/sdi1
Label: 'BTR1' uuid: 2ec4b5a1-a2c4-4687-9015-cf5b519297f3
Total devices 3 FS bytes used 2.47TiB
devid 1 size 3.64TiB used 1.79TiB path /dev/sdn
devid 2 size 3.64TiB used 1.79TiB path /dev/sdo
devid 3 size 3.64TiB used 1.79TiB path /dev/sdp
Label: 'BTR0' uuid: 0ec83db3-4574-4e40-8d57-ebbe9fe246e1
Total devices 4 FS bytes used 2.41TiB
devid 1 size 2.73TiB used 1.21TiB path /dev/sda
devid 2 size 2.73TiB used 1.21TiB path /dev/sdb
devid 3 size 2.73TiB used 1.21TiB path /dev/sdc
devid 4 size 2.73TiB used 1.21TiB path /dev/sdd
Label: 'BTR3' uuid: 89f2016b-984f-4811-99d9-df3b8b5ce318
Total devices 4 FS bytes used 896.00KiB
devid 1 size 2.73TiB used 2.02GiB path /dev/sde
devid 2 size 2.73TiB used 2.00GiB path /dev/sdf
devid 3 size 2.73TiB used 1.01GiB path /dev/sdg
devid 4 size 2.73TiB used 1.01GiB path /dev/sdh
warning, device 3 is missing
warning devid 3 not found already
Btrfs v3.17
-- there are three disks with devid 3, can't tell which one it is. The
fs uuid can be displayed with very little effort:
diff --git a/volumes.c b/volumes.c
index 5b007fc..02866bc 100644
--- a/volumes.c
+++ b/volumes.c
@@ -30,6 +30,7 @@
#include "print-tree.h"
#include "volumes.h"
#include "math.h"
+#include "utils.h"
struct stripe {
struct btrfs_device *dev;
@@ -1625,9 +1626,11 @@ static int read_one_chunk(struct btrfs_root *root,
struct btrfs_key *key,
map->stripes[i].dev = btrfs_find_device(root, devid, uuid,
NULL);
if (!map->stripes[i].dev) {
+ char uuidbuf[BTRFS_UUID_UNPARSED_SIZE];
+ uuid_unparse(root->fs_info->fsid, uuidbuf);
map->stripes[i].dev = fill_missing_device(devid);
- printf("warning, device %llu is missing\n",
- (unsigned long long)devid);
+ printf("warning, device %llu from fs %s is missing\n",
+ (unsigned long long)devid, uuidbuf);
}
}
@@ -1720,8 +1723,10 @@ static int read_one_dev(struct btrfs_root *root,
device = btrfs_find_device(root, devid, dev_uuid, fs_uuid);
if (!device) {
- printk("warning devid %llu not found already\n",
- (unsigned long long)devid);
+ char uuidbuf[BTRFS_UUID_UNPARSED_SIZE];
+ uuid_unparse(fs_uuid, uuidbuf);
+ printk("warning devid %llu from fs %s not found already\n",
+ (unsigned long long)devid, uuidbuf);
device = kzalloc(sizeof(*device), GFP_NOFS);
if (!device)
return -ENOMEM;
Regards,
Petr
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