Issue

• XFS file system shut down when deleting 50 ~ 60 million small files (5 ~ 10 KB).

kernel: XFS (dm-3): xlog_write: reservation summary:
  trans type  = INACTIVE (3)
  unit res    = 78564 bytes
  current res = -33148 bytes
  total reg   = 0 bytes (o/flow = 0 bytes)
  ophdrs      = 0 (ophdr space = 0 bytes)
  ophdr + reg = 0 bytes
  num regions = 0
kernel: XFS : xlog_write: reservation ran out. Need to up reservation
kernel: XFS : xfs_do_force_shutdown(0x2) called from line 2042 of file fs/xfs/xfs_log.c.  Return address = 0xffffffffa033edb8
kernel: XFS : xfs_imap_to_bp: xfs_trans_read_buf() returned error 5.
kernel: XFS : Log I/O Error Detected.  Shutting down filesystem
kernel: XFS : Please umount the filesystem and rectify the problem(s)
kernel: XFS : xfs_log_force: error 5 returned.