client: set total and used to 4KB if quota size less than 4KB

For quota size less than 4KB, report the total=used=4KB,free=0
when quota is full and total=free=4KB, used=0 otherwise.

This is from Kotresh's kceph's fix.

Fixes: https://tracker.ceph.com/issues/56397
Signed-off-by: Xiubo Li <xiubli@redhat.com>

diff --git a/src/client/Client.cc b/src/client/Client.cc
index 88cb711bf36020463262efb521444319df33822c..752aea9186f509a3f751af05631ea6f8df3aa80f 100644 (file)
--- a/src/client/Client.cc
+++ b/src/client/Client.cc
@@ -11221,7 +11221,6 @@ int Client::statfs(const char *path, struct statvfs *stbuf,
    * actually *is* the (ceph) default block size.
    */
   stbuf->f_frsize = CEPH_4M_BLOCK_SIZE;
-  stbuf->f_bsize = CEPH_4M_BLOCK_SIZE;
   stbuf->f_files = total_files_on_fs;
   stbuf->f_ffree = -1;
   stbuf->f_favail = -1;
@@ -11261,11 +11260,19 @@ int Client::statfs(const char *path, struct statvfs *stbuf,
     // Special case: if there is a size quota set on the Inode acting
     // as the root for this client mount, then report the quota status
     // as the filesystem statistics.
-    const fsblkcnt_t total = quota_root->quota.max_bytes >> CEPH_4M_BLOCK_SHIFT;
+    fsblkcnt_t total = quota_root->quota.max_bytes >> CEPH_4M_BLOCK_SHIFT;
     const fsblkcnt_t used = quota_root->rstat.rbytes >> CEPH_4M_BLOCK_SHIFT;
     // It is possible for a quota to be exceeded: arithmetic here must
     // handle case where used > total.
-    const fsblkcnt_t free = total > used ? total - used : 0;
+    fsblkcnt_t free = total > used ? total - used : 0;
+
+    // For quota size less than 4KB, report the total=used=4KB,free=0
+    // when quota is full and total=free=4KB, used=0 otherwise.
+    if (!total) {
+      total = 1;
+      free = quota_root->quota.max_bytes > quota_root->rstat.rbytes ? 1 : 0;
+      stbuf->f_frsize = CEPH_4K_BLOCK_SIZE;
+    }
 
     stbuf->f_blocks = total;
     stbuf->f_bfree = free;
@@ -11278,6 +11285,7 @@ int Client::statfs(const char *path, struct statvfs *stbuf,
     stbuf->f_bfree = stats.kb_avail >> CEPH_4K_BLOCK_SHIFT;
     stbuf->f_bavail = stats.kb_avail >> CEPH_4K_BLOCK_SHIFT;
   }
+  stbuf->f_bsize = stbuf->f_frsize;
 
   return rval;
 }