[v3,4/4] btrfs: sysfs: export supported checksums
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Message ID 20190826114834.14789-5-jthumshirn@suse.de
State New
Headers show
Series
  • btrfs: support xxhash64 checksums
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Commit Message

Johannes Thumshirn Aug. 26, 2019, 11:48 a.m. UTC
From: David Sterba <dsterba@suse.com>

Export supported checksum algorithms via sysfs.

Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Johannes Thumshirn <jthumshirn@suse.de>

---
Changes to v2:
- Prevent possible overflow of sysfs attribute
Changes to v1:
- Removed btrfs_checksums_store() function (Nik)
- Renamed sysfs file to supported_checksums
---
 fs/btrfs/sysfs.c | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

Patch
diff mbox series

diff --git a/fs/btrfs/sysfs.c b/fs/btrfs/sysfs.c
index f6d3c80f2e28..cae9c99253c7 100644
--- a/fs/btrfs/sysfs.c
+++ b/fs/btrfs/sysfs.c
@@ -246,6 +246,24 @@  static umode_t btrfs_feature_visible(struct kobject *kobj,
 	return mode;
 }
 
+static ssize_t btrfs_supported_checksums_show(struct kobject *kobj,
+					      struct kobj_attribute *a,
+					      char *buf)
+{
+	ssize_t ret = 0;
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(btrfs_csums); i++) {
+		ret += snprintf(buf + ret, PAGE_SIZE - ret, "%s%s",
+				(i == 0 ? "" : ", "),
+				btrfs_csums[i].name);
+
+	}
+
+	ret += snprintf(buf + ret, PAGE_SIZE - ret, "\n");
+	return ret;
+}
+
 BTRFS_FEAT_ATTR_INCOMPAT(mixed_backref, MIXED_BACKREF);
 BTRFS_FEAT_ATTR_INCOMPAT(default_subvol, DEFAULT_SUBVOL);
 BTRFS_FEAT_ATTR_INCOMPAT(mixed_groups, MIXED_GROUPS);
@@ -259,6 +277,14 @@  BTRFS_FEAT_ATTR_INCOMPAT(no_holes, NO_HOLES);
 BTRFS_FEAT_ATTR_INCOMPAT(metadata_uuid, METADATA_UUID);
 BTRFS_FEAT_ATTR_COMPAT_RO(free_space_tree, FREE_SPACE_TREE);
 
+static struct btrfs_feature_attr btrfs_attr_features_checksums_name = {
+	.kobj_attr = __INIT_KOBJ_ATTR(supported_checksums, S_IRUGO,
+				      btrfs_supported_checksums_show,
+				      NULL),
+	.feature_set	= FEAT_INCOMPAT,
+	.feature_bit	= 0,
+};
+
 static struct attribute *btrfs_supported_feature_attrs[] = {
 	BTRFS_FEAT_ATTR_PTR(mixed_backref),
 	BTRFS_FEAT_ATTR_PTR(default_subvol),
@@ -272,6 +298,9 @@  static struct attribute *btrfs_supported_feature_attrs[] = {
 	BTRFS_FEAT_ATTR_PTR(no_holes),
 	BTRFS_FEAT_ATTR_PTR(metadata_uuid),
 	BTRFS_FEAT_ATTR_PTR(free_space_tree),
+
+	&btrfs_attr_features_checksums_name.kobj_attr.attr,
+
 	NULL
 };