btrfs: refactor btrfs_dev_replace_start for reuse
A refactor patch, and avoids user input verification in the
btrfs_dev_replace_start(), and so this function can be reused.
Signed-off-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>
diff --git a/fs/btrfs/dev-replace.c b/fs/btrfs/dev-replace.c
index 1a3d245..5aebedf 100644
--- a/fs/btrfs/dev-replace.c
+++ b/fs/btrfs/dev-replace.c
@@ -302,8 +302,8 @@
dev_replace->cursor_left_last_write_of_item;
}
-int btrfs_dev_replace_start(struct btrfs_root *root,
- struct btrfs_ioctl_dev_replace_args *args)
+int btrfs_dev_replace_start(struct btrfs_root *root, char *tgtdev_name,
+ u64 srcdevid, char *srcdev_name, int read_src)
{
struct btrfs_trans_handle *trans;
struct btrfs_fs_info *fs_info = root->fs_info;
@@ -312,25 +312,16 @@
struct btrfs_device *tgt_device = NULL;
struct btrfs_device *src_device = NULL;
- switch (args->start.cont_reading_from_srcdev_mode) {
- case BTRFS_IOCTL_DEV_REPLACE_CONT_READING_FROM_SRCDEV_MODE_ALWAYS:
- case BTRFS_IOCTL_DEV_REPLACE_CONT_READING_FROM_SRCDEV_MODE_AVOID:
- break;
- default:
- return -EINVAL;
- }
-
/* the disk copy procedure reuses the scrub code */
mutex_lock(&fs_info->volume_mutex);
- ret = btrfs_find_device_by_devspec(root, args->start.srcdevid,
- args->start.srcdev_name,
- &src_device);
+ ret = btrfs_find_device_by_devspec(root, srcdevid,
+ srcdev_name, &src_device);
if (ret) {
mutex_unlock(&fs_info->volume_mutex);
return ret;
}
- ret = btrfs_init_dev_replace_tgtdev(root, args->start.tgtdev_name,
+ ret = btrfs_init_dev_replace_tgtdev(root, tgtdev_name,
src_device, &tgt_device);
mutex_unlock(&fs_info->volume_mutex);
if (ret)
@@ -357,12 +348,11 @@
break;
case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED:
case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED:
- args->result = BTRFS_IOCTL_DEV_REPLACE_RESULT_ALREADY_STARTED;
+ ret = BTRFS_IOCTL_DEV_REPLACE_RESULT_ALREADY_STARTED;
goto leave;
}
- dev_replace->cont_reading_from_srcdev_mode =
- args->start.cont_reading_from_srcdev_mode;
+ dev_replace->cont_reading_from_srcdev_mode = read_src;
WARN_ON(!src_device);
dev_replace->srcdev = src_device;
WARN_ON(!tgt_device);
@@ -389,7 +379,6 @@
dev_replace->item_needs_writeback = 1;
atomic64_set(&dev_replace->num_write_errors, 0);
atomic64_set(&dev_replace->num_uncorrectable_read_errors, 0);
- args->result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR;
btrfs_dev_replace_unlock(dev_replace, 1);
ret = btrfs_sysfs_add_device_link(tgt_device->fs_devices, tgt_device);
@@ -415,10 +404,8 @@
&dev_replace->scrub_progress, 0, 1);
ret = btrfs_dev_replace_finishing(fs_info, ret);
- /* don't warn if EINPROGRESS, someone else might be running scrub */
if (ret == -EINPROGRESS) {
- args->result = BTRFS_IOCTL_DEV_REPLACE_RESULT_SCRUB_INPROGRESS;
- ret = 0;
+ ret = BTRFS_IOCTL_DEV_REPLACE_RESULT_SCRUB_INPROGRESS;
} else {
WARN_ON(ret);
}
@@ -433,6 +420,35 @@
return ret;
}
+int btrfs_dev_replace_by_ioctl(struct btrfs_root *root,
+ struct btrfs_ioctl_dev_replace_args *args)
+{
+ int ret;
+
+ switch (args->start.cont_reading_from_srcdev_mode) {
+ case BTRFS_IOCTL_DEV_REPLACE_CONT_READING_FROM_SRCDEV_MODE_ALWAYS:
+ case BTRFS_IOCTL_DEV_REPLACE_CONT_READING_FROM_SRCDEV_MODE_AVOID:
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ if ((args->start.srcdevid == 0 && args->start.srcdev_name[0] == '\0') ||
+ args->start.tgtdev_name[0] == '\0')
+ return -EINVAL;
+
+ ret = btrfs_dev_replace_start(root, args->start.tgtdev_name,
+ args->start.srcdevid,
+ args->start.srcdev_name,
+ args->start.cont_reading_from_srcdev_mode);
+ args->result = ret;
+ /* don't warn if EINPROGRESS, someone else might be running scrub */
+ if (ret == BTRFS_IOCTL_DEV_REPLACE_RESULT_SCRUB_INPROGRESS)
+ ret = 0;
+
+ return ret;
+}
+
/*
* blocked until all flighting bios are finished.
*/