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From:   Goffredo Baroncelli <kreijack@tiscali.it>
To:     linux-btrfs@vger.kernel.org
Cc:     Zygo Blaxell <ce3g8jdj@umail.furryterror.org>,
        Josef Bacik <josef@toxicpanda.com>,
        David Sterba <dsterba@suse.cz>,
        Sinnamohideen Shafeeq <shafeeqs@panasas.com>,
        Paul Jones <paul@pauljones.id.au>, Boris Burkov <boris@bur.io>,
        Goffredo Baroncelli <kreijack@inwind.it>
Subject: [PATCH 2/6] btrfs: export the device allocation_hint property in sysfs
Date:   Thu,  6 Jan 2022 18:49:19 +0100
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From: Goffredo Baroncelli <kreijack@inwind.it>

Eport the device allocation_hint property via
/sys/fs/btrfs/<uuid>/devinfo/<devid>/allocation_hint

Signed-off-by: Goffredo Baroncelli <kreijack@inwind.it>
---
 fs/btrfs/sysfs.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/fs/btrfs/sysfs.c b/fs/btrfs/sysfs.c
index beb7f72d50b8..c1c903187e19 100644
--- a/fs/btrfs/sysfs.c
+++ b/fs/btrfs/sysfs.c
@@ -1575,6 +1575,17 @@ static ssize_t btrfs_devinfo_error_stats_show(struct kobject *kobj,
 }
 BTRFS_ATTR(devid, error_stats, btrfs_devinfo_error_stats_show);
 
+static ssize_t btrfs_devinfo_allocation_hint_show(struct kobject *kobj,
+					struct kobj_attribute *a, char *buf)
+{
+	struct btrfs_device *device = container_of(kobj, struct btrfs_device,
+						   devid_kobj);
+
+	return scnprintf(buf, PAGE_SIZE, "0x%08llx\n",
+		device->type & BTRFS_DEV_ALLOCATION_HINT_MASK);
+}
+BTRFS_ATTR(devid, allocation_hint, btrfs_devinfo_allocation_hint_show);
+
 /*
  * Information about one device.
  *
@@ -1588,6 +1599,7 @@ static struct attribute *devid_attrs[] = {
 	BTRFS_ATTR_PTR(devid, replace_target),
 	BTRFS_ATTR_PTR(devid, scrub_speed_max),
 	BTRFS_ATTR_PTR(devid, writeable),
+	BTRFS_ATTR_PTR(devid, allocation_hint),
 	NULL
 };
 ATTRIBUTE_GROUPS(devid);
-- 
2.34.1