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btrfs-progs: fix wrong num_devices for btrfs fi show with seed devices 

The @fi_args->num_devices in @get_fs_info() does not include seed devices.
We could just correct it by searching the chunk tree and count how
many dev_items there are in total which includes seed devices.

Signed-off-by: Gui Hecheng <guihc.fnst@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.cz>
This commit is contained in:
Gui Hecheng 2014-11-13 09:19:29 +08:00 committed by David Sterba
parent 9f9330200f
commit 7269fa1570
1 changed files with 76 additions and 0 deletions
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76
utils.c
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@ -1815,6 +1815,75 @@ int get_device_info(int fd, u64 devid,
return ret ? -errno : 0;
}
static u64 find_max_device_id(struct btrfs_ioctl_search_args *search_args,
int nr_items)
{
struct btrfs_dev_item *dev_item;
char *buf = search_args->buf;
buf += (nr_items - 1) * (sizeof(struct btrfs_ioctl_search_header)
+ sizeof(struct btrfs_dev_item));
buf += sizeof(struct btrfs_ioctl_search_header);
dev_item = (struct btrfs_dev_item *)buf;
return btrfs_stack_device_id(dev_item);
}
static int search_chunk_tree_for_fs_info(int fd,
struct btrfs_ioctl_fs_info_args *fi_args)
{
int ret;
int max_items;
u64 start_devid = 1;
struct btrfs_ioctl_search_args search_args;
struct btrfs_ioctl_search_key *search_key = &search_args.key;
fi_args->num_devices = 0;
max_items = BTRFS_SEARCH_ARGS_BUFSIZE
/ (sizeof(struct btrfs_ioctl_search_header)
+ sizeof(struct btrfs_dev_item));
search_key->tree_id = BTRFS_CHUNK_TREE_OBJECTID;
search_key->min_objectid = BTRFS_DEV_ITEMS_OBJECTID;
search_key->max_objectid = BTRFS_DEV_ITEMS_OBJECTID;
search_key->min_type = BTRFS_DEV_ITEM_KEY;
search_key->max_type = BTRFS_DEV_ITEM_KEY;
search_key->min_transid = 0;
search_key->max_transid = (u64)-1;
search_key->nr_items = max_items;
search_key->max_offset = (u64)-1;
again:
search_key->min_offset = start_devid;
ret = ioctl(fd, BTRFS_IOC_TREE_SEARCH, &search_args);
if (ret < 0)
return -errno;
fi_args->num_devices += (u64)search_key->nr_items;
if (search_key->nr_items == max_items) {
start_devid = find_max_device_id(&search_args,
search_key->nr_items) + 1;
goto again;
}
/* get the lastest max_id to stay consistent with the num_devices */
if (search_key->nr_items == 0)
/*
* last tree_search returns an empty buf, use the devid of
* the last dev_item of the previous tree_search
*/
fi_args->max_id = start_devid - 1;
else
fi_args->max_id = find_max_device_id(&search_args,
search_key->nr_items);
return 0;
}
/*
* For a given path, fill in the ioctl fs_ and info_ args.
* If the path is a btrfs mountpoint, fill info for all devices.
@ -1894,6 +1963,13 @@ int get_fs_info(char *path, struct btrfs_ioctl_fs_info_args *fi_args,
ret = -errno;
goto out;
}
/*
* The fs_args->num_devices does not include seed devices
*/
ret = search_chunk_tree_for_fs_info(fd, fi_args);
if (ret)
goto out;
}
if (!fi_args->num_devices)