Make find_device to be consistent with kernel according
35c70103a528 ("btrfs: refactor find_device helper")
And, modify the compare condition from both devid and uuid to
devid or devid and uuid according
8f18cf13396c ("Btrfs: Make the resizer work based on shrinking and growing devices")
Signed-off-by: Gu Jinxiang <gujx@xxxxxxxxxxxxxx>
---
volumes.c | 19 +++++++++++++------
1 file changed, 13 insertions(+), 6 deletions(-)
diff --git a/volumes.c b/volumes.c
index edad367b..1320b55b 100644
--- a/volumes.c
+++ b/volumes.c
@@ -54,14 +54,22 @@ static inline int nr_data_stripes(struct map_lookup *map)
static LIST_HEAD(fs_uuids);
-static struct btrfs_device *__find_device(struct list_head *head, u64 devid,
- u8 *uuid)
+/*
+ * Find a device specified by @devid or @uuid in the list of @fs_devices, or
+ * return NULL.
+ *
+ * If devid and uuid are both specified, the match must be exact, otherwise
+ * only devid is used.
+ */
+static struct btrfs_device *find_device(struct btrfs_fs_devices *fs_devices,
+ u64 devid, u8 *uuid)
{
+ struct list_head *head = &fs_devices->devices;
struct btrfs_device *dev;
list_for_each_entry(dev, head, dev_list) {
if (dev->devid == devid &&
- !memcmp(dev->uuid, uuid, BTRFS_UUID_SIZE)) {
+ (!uuid || !memcmp(dev->uuid, uuid, BTRFS_UUID_SIZE))) {
return dev;
}
}
@@ -100,7 +108,7 @@ static int device_list_add(const char *path,
fs_devices->lowest_devid = (u64)-1;
device = NULL;
} else {
- device = __find_device(&fs_devices->devices, devid,
+ device = find_device(fs_devices, devid,
disk_super->dev_item.uuid);
}
if (!device) {
@@ -1616,8 +1624,7 @@ struct btrfs_device *btrfs_find_device(struct btrfs_fs_info *fs_info, u64 devid,
if (!fsid ||
(!memcmp(cur_devices->fsid, fsid, BTRFS_UUID_SIZE) ||
fs_info->ignore_fsid_mismatch)) {
- device = __find_device(&cur_devices->devices,
- devid, uuid);
+ device = find_device(cur_devices, devid, uuid);
if (device)
return device;
}
--
2.14.3
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