btrfs: simplify btrfs_dev_replace_kthread

This function prints an informative message and then continues
dev-replace. The message contains a progress percentage which is read
from the status. The status is allocated dynamically, about 2600 bytes,
just to read the single value. That's an overkill. We'll use the new
helper and drop the allocation.

Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/dev-replace.c b/fs/btrfs/dev-replace.c
index 31d01eefecd05fddd371ce9d7e676e8fd8fcc4b8..7a93a3e1a847d9271e0227fef998aee978a719db 100644 (file)
--- a/fs/btrfs/dev-replace.c
+++ b/fs/btrfs/dev-replace.c
@@ -809,25 +809,19 @@ static int btrfs_dev_replace_kthread(void *data)
 {
        struct btrfs_fs_info *fs_info = data;
        struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace;
-       struct btrfs_ioctl_dev_replace_args *status_args;
        u64 progress;
 
-       status_args = kzalloc(sizeof(*status_args), GFP_KERNEL);
-       if (status_args) {
-               btrfs_dev_replace_status(fs_info, status_args);
-               progress = status_args->status.progress_1000;
-               kfree(status_args);
-               progress = div_u64(progress, 10);
-               btrfs_info_in_rcu(fs_info,
-                       "continuing dev_replace from %s (devid %llu) to %s @%u%%",
-                       dev_replace->srcdev->missing ? "<missing disk>" :
-                       rcu_str_deref(dev_replace->srcdev->name),
-                       dev_replace->srcdev->devid,
-                       dev_replace->tgtdev ?
-                       rcu_str_deref(dev_replace->tgtdev->name) :
-                       "<missing target disk>",
-                       (unsigned int)progress);
-       }
+       progress = btrfs_dev_replace_progress(fs_info);
+       progress = div_u64(progress, 10);
+       btrfs_info_in_rcu(fs_info,
+               "continuing dev_replace from %s (devid %llu) to %s @%u%%",
+               dev_replace->srcdev->missing ? "<missing disk>"
+                       : rcu_str_deref(dev_replace->srcdev->name),
+               dev_replace->srcdev->devid,
+               dev_replace->tgtdev ? rcu_str_deref(dev_replace->tgtdev->name)
+                       : "<missing target disk>",
+               (unsigned int)progress);
+
        btrfs_dev_replace_continue_on_mount(fs_info);
        clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags);