From: Zygo Blaxell <ce3g8jdj@umail.furryterror.org>
Date: Sun, 5 Dec 2021 08:36:01 +0000 (-0500)
Subject: Revert "btrfs: introduce new device-state read_preferred (rebased 5.13)"
X-Git-Url: http://git.hungrycats.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=bf85940af6f6c2972f91ad14ce4a94f93e342222;p=linux

Revert "btrfs: introduce new device-state read_preferred (rebased 5.13)"

This reverts commit a6ad84dfbd80a1724d76098a130acb3ba813e1d8.
---

diff --git a/fs/btrfs/sysfs.c b/fs/btrfs/sysfs.c
index fc89812cb8d6..16237a9a82e3 100644
--- a/fs/btrfs/sysfs.c
+++ b/fs/btrfs/sysfs.c
@@ -1508,63 +1508,6 @@ static ssize_t btrfs_devinfo_type_show(struct kobject *kobj,
 }
 BTRFS_ATTR(devid, type, btrfs_devinfo_type_show);
 
-static ssize_t btrfs_devinfo_read_pref_show(struct kobject *kobj,
-					    struct kobj_attribute *a, char *buf)
-{
-	int val;
-	struct btrfs_device *device = container_of(kobj, struct btrfs_device,
-						   devid_kobj);
-
-	val = !!test_bit(BTRFS_DEV_STATE_READ_PREFERRED, &device->dev_state);
-
-	return snprintf(buf, PAGE_SIZE, "%d\n", val);
-}
-
-static ssize_t btrfs_devinfo_read_pref_store(struct kobject *kobj,
-					     struct kobj_attribute *a,
-					     const char *buf, size_t len)
-{
-	int ret;
-	unsigned long val;
-	struct btrfs_device *device;
-
-	ret = kstrtoul(skip_spaces(buf), 0, &val);
-	if (ret)
-		return ret;
-
-	if (val != 0 && val != 1)
-		return -EINVAL;
-
-	/*
-	 * lock is not required, the btrfs_device struct can't be freed while
-	 * its kobject btrfs_device::devid_kobj is still open.
-	 */
-	device = container_of(kobj, struct btrfs_device, devid_kobj);
-
-	if (val &&
-	    !test_bit(BTRFS_DEV_STATE_READ_PREFERRED, &device->dev_state)) {
-		set_bit(BTRFS_DEV_STATE_READ_PREFERRED, &device->dev_state);
-		btrfs_info(device->fs_devices->fs_info,
-			   "set read preferred on devid %llu (%d)",
-			   device->devid, task_pid_nr(current));
-	} else if (!val &&
-		   test_bit(BTRFS_DEV_STATE_READ_PREFERRED, &device->dev_state)) {
-		clear_bit(BTRFS_DEV_STATE_READ_PREFERRED, &device->dev_state);
-		btrfs_info(device->fs_devices->fs_info,
-			   "reset read preferred on devid %llu (%d)",
-			   device->devid, task_pid_nr(current));
-	}
-
-	return len;
-}
-BTRFS_ATTR_RW(devid, read_preferred, btrfs_devinfo_read_pref_show,
-	      btrfs_devinfo_read_pref_store);
-
-/*
- * Information about one device.
- *
- * Path: /sys/fs/btrfs/<uuid>/devinfo/<devid>/
- */
 static struct attribute *devid_attrs[] = {
 	BTRFS_ATTR_PTR(devid, in_fs_metadata),
 	BTRFS_ATTR_PTR(devid, missing),
@@ -1572,7 +1515,6 @@ static struct attribute *devid_attrs[] = {
 	BTRFS_ATTR_PTR(devid, scrub_speed_max),
 	BTRFS_ATTR_PTR(devid, writeable),
 	BTRFS_ATTR_PTR(devid, type),
-	BTRFS_ATTR_PTR(devid, read_preferred),
 	NULL
 };
 ATTRIBUTE_GROUPS(devid);
diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h
index c3968a93ccc3..bfb06fb4b571 100644
--- a/fs/btrfs/volumes.h
+++ b/fs/btrfs/volumes.h
@@ -51,7 +51,6 @@ struct btrfs_io_geometry {
 #define BTRFS_DEV_STATE_REPLACE_TGT	(3)
 #define BTRFS_DEV_STATE_FLUSH_SENT	(4)
 #define BTRFS_DEV_STATE_NO_READA	(5)
-#define BTRFS_DEV_STATE_READ_PREFERRED	(6)
 
 struct btrfs_zoned_device_info;