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Fill missing devices so degraded filesystems can be read 

When a device is missing, the btrfs tools need to be able to read alternate
copies from the remaining devices.  This creates placeholder devices
that always return -EIO so the tools can limp along.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
master
Chris Mason 2010-12-15 16:00:23 -05:00
parent 375714fe11
commit 7cd060deea
2 changed files with 14 additions and 2 deletions
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1
disk-io.c
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@ -204,6 +204,7 @@ struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr,
eb->dev_bytenr = multi->stripes[0].physical;
kfree(multi);
ret = read_extent_from_disk(eb);
if (ret == 0 && check_tree_block(root, eb) == 0 &&
csum_tree_block(root, eb, 1) == 0 &&
verify_parent_transid(eb->tree, eb, parent_transid) == 0) {

15
volumes.c
View File

@ -1159,6 +1159,16 @@ int btrfs_chunk_readonly(struct btrfs_root *root, u64 chunk_offset)
return readonly;
}
static struct btrfs_device *fill_missing_device(u64 devid)
{
struct btrfs_device *device;
device = kzalloc(sizeof(*device), GFP_NOFS);
device->devid = devid;
device->fd = -1;
return device;
}
static int read_one_chunk(struct btrfs_root *root, struct btrfs_key *key,
struct extent_buffer *leaf,
struct btrfs_chunk *chunk)
@ -1209,8 +1219,9 @@ 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) {
kfree(map);
return -EIO;
map->stripes[i].dev = fill_missing_device(devid);
printf("warning, device %llu is missing\n",
(unsigned long long)devid);
}
}