[PATCH] fix: release unused ceph cap reservation on readdir error

[deepakroag <gaikwad.dcg@gmail.com>]

Return unused reserved caps to the MDS client pool when
ceph_readdir_prepopulate() exits with an error.

Corrected standalone submission: this patch was mistakenly
sent earlier as [PATCH 4/4] in an unrelated multi-subsystem
series.  It is ceph-only and resubmitted here as [PATCH 1/1].

Link: https://lore.kernel.org/ceph-devel/20260715143646.15828-4-gaikwad.dcg@gmail.com/

Signed-off-by: deepakroag <gaikwad.dcg@gmail.com>
---
 fs/ceph/inode.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/fs/ceph/inode.c b/fs/ceph/inode.c
index 61d7c0b81..2d6a80054 100644
--- a/fs/ceph/inode.c
+++ b/fs/ceph/inode.c
@@ -2188,6 +2188,8 @@ int ceph_readdir_prepopulate(struct ceph_mds_request *req,
 		dput(dn);
 	}
 out:
+	if (err)
+		ceph_unreserve_caps(req->r_mdsc, &req->r_caps_reservation);
 	if (err == 0 && skipped == 0) {
 		set_bit(CEPH_MDS_R_DID_PREPOPULATE, &req->r_req_flags);
 		req->r_readdir_cache_idx = cache_ctl.index;
-- 
Deepak Rao Gaikwad