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Subject[PATCH -V7 6/9] ext4: Add get_fsid callback
Date
Acked-by: Serge Hallyn <serue@us.ibm.com>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
---
fs/ext4/super.c | 15 +++++++++++++++
1 files changed, 15 insertions(+), 0 deletions(-)

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index e14d22c..fc7d464 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -1049,6 +1049,19 @@ static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
return try_to_free_buffers(page);
}

+static int ext4_get_fsid(struct super_block *sb, struct uuid *fsid)
+{
+ struct ext4_sb_info *sbi = EXT4_SB(sb);
+ struct ext4_super_block *es = sbi->s_es;
+
+ memcpy(fsid->uuid, es->s_uuid, sizeof(fsid->uuid));
+ /*
+ * We may want to make sure we return error if the s_uuid is not
+ * exactly unique
+ */
+ return 0;
+}
+
#ifdef CONFIG_QUOTA
#define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
#define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
@@ -1109,6 +1122,7 @@ static const struct super_operations ext4_sops = {
.quota_write = ext4_quota_write,
#endif
.bdev_try_to_free_page = bdev_try_to_free_page,
+ .get_fsid = ext4_get_fsid,
};

static const struct super_operations ext4_nojournal_sops = {
@@ -1128,6 +1142,7 @@ static const struct super_operations ext4_nojournal_sops = {
.quota_write = ext4_quota_write,
#endif
.bdev_try_to_free_page = bdev_try_to_free_page,
+ .get_fsid = ext4_get_fsid,
};

static const struct export_operations ext4_export_ops = {
--
1.7.1.78.g212f0


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