[PATCH 2/6] btrfs: export the device allocation_hint property in sysfs
From: Goffredo Baroncelli <hidden>
Date: 2021-12-17 18:52:24
Subsystem:
btrfs file system, filesystems (vfs and infrastructure), the rest · Maintainers:
Chris Mason, David Sterba, Alexander Viro, Christian Brauner, Linus Torvalds
From: Goffredo Baroncelli <redacted> Eport the device allocation_hint property via /sys/fs/btrfs/<uuid>/devinfo/<devid>/allocation_hint Signed-off-by: Goffredo Baroncelli <redacted> --- fs/btrfs/sysfs.c | 12 ++++++++++++ 1 file changed, 12 insertions(+)
diff --git a/fs/btrfs/sysfs.c b/fs/btrfs/sysfs.c
index beb7f72d50b8..a8d918700d2b 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