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btrfs: add_missing_dev() should return the actual error 

add_missing_dev() can return device pointer so that IS_ERR/PTR_ERR can
be used to check for the actual error that occurred in the function.

Signed-off-by: Anand Jain <anand.jain@oracle.com>
Reviewed-by: Liu Bo <bo.li.liu@oracle.com>
[ minor error message adjustment ]
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Anand Jain 2017-10-11 12:46:18 +08:00 committed by David Sterba
parent 9e882d6d05
commit adfb69af7d
1 changed files with 12 additions and 5 deletions
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17
fs/btrfs/volumes.c
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@ -6238,7 +6238,7 @@ static struct btrfs_device *add_missing_dev(struct btrfs_fs_devices *fs_devices,
device = btrfs_alloc_device(NULL, &devid, dev_uuid);
if (IS_ERR(device))
return NULL;
return device;
list_add(&device->dev_list, &fs_devices->devices);
device->fs_devices = fs_devices;
@ -6443,9 +6443,12 @@ static int read_one_chunk(struct btrfs_fs_info *fs_info, struct btrfs_key *key,
map->stripes[i].dev =
add_missing_dev(fs_info->fs_devices, devid,
uuid);
if (!map->stripes[i].dev) {
if (IS_ERR(map->stripes[i].dev)) {
free_extent_map(em);
return -EIO;
btrfs_err(fs_info,
"failed to init missing dev %llu: %ld",
devid, PTR_ERR(map->stripes[i].dev));
return PTR_ERR(map->stripes[i].dev);
}
btrfs_report_missing_device(fs_info, devid, uuid);
}
@ -6571,8 +6574,12 @@ static int read_one_dev(struct btrfs_fs_info *fs_info,
}
device = add_missing_dev(fs_devices, devid, dev_uuid);
if (!device)
return -ENOMEM;
if (IS_ERR(device)) {
btrfs_err(fs_info,
"failed to add missing dev %llu: %ld",
devid, PTR_ERR(device));
return PTR_ERR(device);
}
btrfs_report_missing_device(fs_info, devid, dev_uuid);
} else {
if (!device->bdev) {