Instead of pointer to btrfs_fs_devices as an arg in device_list_add()
better to get pointer to btrfs_device as return value, then we have
both, pointer to btrfs_device and btrfs_fs_devices. btrfs_device is
needed to handle reappearing missing device.
Signed-off-by: Anand Jain <anand.j...@oracle.com>
---
fs/btrfs/volumes.c | 34 ++++++++++++++++++----------------
1 file changed, 18 insertions(+), 16 deletions(-)
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 66e5dada2d74..d93ee0b91ad9 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -726,12 +726,11 @@ static int btrfs_open_one_device(struct btrfs_fs_devices
*fs_devices,
* Add new device to list of registered devices
*
* Returns:
- * 0 - device already known or newly added
- * < 0 - error
+ * device pointer which was just added or updated when successful
+ * error pointer when failed
*/
-static noinline int device_list_add(const char *path,
- struct btrfs_super_block *disk_super,
- u64 devid, struct btrfs_fs_devices **fs_devices_ret)
+static noinline struct btrfs_device *device_list_add(const char *path,
+ struct btrfs_super_block *disk_super, u64 devid)
{
struct btrfs_device *device;
struct btrfs_fs_devices *fs_devices;
@@ -742,7 +741,7 @@ static noinline int device_list_add(const char *path,
if (!fs_devices) {
fs_devices = alloc_fs_devices(disk_super->fsid);
if (IS_ERR(fs_devices))
- return PTR_ERR(fs_devices);
+ return ERR_PTR(PTR_ERR(fs_devices));
list_add(&fs_devices->list, &fs_uuids);
@@ -754,19 +753,19 @@ static noinline int device_list_add(const char *path,
if (!device) {
if (fs_devices->opened)
- return -EBUSY;
+ return ERR_PTR(-EBUSY);
device = btrfs_alloc_device(NULL, &devid,
disk_super->dev_item.uuid);
if (IS_ERR(device)) {
/* we can safely leave the fs_devices entry around */
- return PTR_ERR(device);
+ return device;
}
name = rcu_string_strdup(path, GFP_NOFS);
if (!name) {
free_device(device);
- return -ENOMEM;
+ return ERR_PTR(-ENOMEM);
}
rcu_assign_pointer(device->name, name);
@@ -820,12 +819,12 @@ static noinline int device_list_add(const char *path,
* with larger generation number or the last-in if
* generation are equal.
*/
- return -EEXIST;
+ return ERR_PTR(-EEXIST);
}
name = rcu_string_strdup(path, GFP_NOFS);
if (!name)
- return -ENOMEM;
+ return ERR_PTR(-ENOMEM);
rcu_string_free(device->name);
rcu_assign_pointer(device->name, name);
if (test_bit(BTRFS_DEV_STATE_MISSING, &device->dev_state)) {
@@ -845,9 +844,7 @@ static noinline int device_list_add(const char *path,
fs_devices->total_devices = btrfs_super_num_devices(disk_super);
- *fs_devices_ret = fs_devices;
-
- return 0;
+ return device;
}
static struct btrfs_fs_devices *clone_fs_devices(struct btrfs_fs_devices *orig)
@@ -1182,9 +1179,10 @@ int btrfs_scan_one_device(const char *path, fmode_t
flags, void *holder,
struct btrfs_fs_devices **fs_devices_ret)
{
struct btrfs_super_block *disk_super;
+ struct btrfs_device *device;
struct block_device *bdev;
struct page *page;
- int ret;
+ int ret = 0;
u64 devid;
u64 bytenr;
@@ -1209,8 +1207,12 @@ int btrfs_scan_one_device(const char *path, fmode_t
flags, void *holder,
devid = btrfs_stack_device_id(&disk_super->dev_item);
mutex_lock(&uuid_mutex);
- ret = device_list_add(path, disk_super, devid, fs_devices_ret);
+ device = device_list_add(path, disk_super, devid);
mutex_unlock(&uuid_mutex);
+ if (IS_ERR(device))
+ ret = PTR_ERR(device);
+
+ *fs_devices_ret = device->fs_devices;
btrfs_release_disk_super(page);
--
2.7.0
--
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