[PATCH 2/2] ceph: extract entity name from device id

[Patrick Donnelly]

From: Patrick Donnelly <pdonnell@xxxxxxxxxx>

Previously, the "name" in the new device syntax "<name>@<fsid>.<fsname>" was
ignored because (presumably) tests were done using mount.ceph which also passed
the entity name using "-o name=foo". If mounting is done without the mount.ceph
helper, the new device id syntax fails to set the name properly.

Cc: stable@xxxxxxxxxxxxxxx
Resolves: https://tracker.ceph.com/issues/68516
Signed-off-by: Patrick Donnelly <pdonnell@xxxxxxxxxx>
---
 fs/ceph/super.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/fs/ceph/super.c b/fs/ceph/super.c
index 42bdbe5b7ef9..de03cd6eb86e 100644
--- a/fs/ceph/super.c
+++ b/fs/ceph/super.c
@@ -285,7 +285,9 @@ static int ceph_parse_new_source(const char *dev_name, const char *dev_name_end,
 	size_t len;
 	struct ceph_fsid fsid;
 	struct ceph_parse_opts_ctx *pctx = fc->fs_private;
+	struct ceph_options *opts = pctx->copts;
 	struct ceph_mount_options *fsopt = pctx->opts;
+	const char *name_start = dev_name;
 	const char *fsid_start, *fs_name_start;
 
 	if (*dev_name_end != '=') {
@@ -296,8 +298,14 @@ static int ceph_parse_new_source(const char *dev_name, const char *dev_name_end,
 	fsid_start = strchr(dev_name, '@');
 	if (!fsid_start)
 		return invalfc(fc, "missing cluster fsid");
-	++fsid_start; /* start of cluster fsid */
+	len = fsid_start - name_start;
+	kfree(opts->name);
+	opts->name = kstrndup(name_start, len, GFP_KERNEL);
+	if (!opts->name)
+		return -ENOMEM;
+	dout("using %s entity name", opts->name);
 
+	++fsid_start; /* start of cluster fsid */
 	fs_name_start = strchr(fsid_start, '.');
 	if (!fs_name_start)
 		return invalfc(fc, "missing file system name");
-- 
Patrick Donnelly, Ph.D.
He / Him / His
Red Hat Partner Engineer
IBM, Inc.
GPG: 19F28A586F808C2402351B93C3301A3E258DD79D