+ /* Reinitialize the RDONLY and DEGRADED flags at the client
+ * on each statfs, so they don't stay set permanently. */
+ spin_lock(&cli->cl_oscc.oscc_lock);
+
+ if (unlikely(msfs->os_state & OS_STATE_DEGRADED))
+ cli->cl_oscc.oscc_flags |= OSCC_FLAG_DEGRADED;
+ else if (unlikely(cli->cl_oscc.oscc_flags & OSCC_FLAG_DEGRADED))
+ cli->cl_oscc.oscc_flags &= ~OSCC_FLAG_DEGRADED;
+
+ if (unlikely(msfs->os_state & OS_STATE_READONLY))
+ cli->cl_oscc.oscc_flags |= OSCC_FLAG_RDONLY;
+ else if (unlikely(cli->cl_oscc.oscc_flags & OSCC_FLAG_RDONLY))
+ cli->cl_oscc.oscc_flags &= ~OSCC_FLAG_RDONLY;
+
+ /* Add a bit of hysteresis so this flag isn't continually flapping,
+ * and ensure that new files don't get extremely fragmented due to
+ * only a small amount of available space in the filesystem.
+ * We want to set the NOSPC flag when there is less than ~0.1% free
+ * and clear it when there is at least ~0.2% free space, so:
+ * avail < ~0.1% max max = avail + used
+ * 1025 * avail < avail + used used = blocks - free
+ * 1024 * avail < used
+ * 1024 * avail < blocks - free
+ * avail < ((blocks - free) >> 10)
+ *
+ * On very large disk, say 16TB 0.1% will be 16 GB. We don't want to
+ * lose that amount of space so in those cases we report no space left
+ * if their is less than 1 GB left. */
+ used = min_t(__u64,(msfs->os_blocks - msfs->os_bfree) >> 10, 1 << 30);
+ if (unlikely(((cli->cl_oscc.oscc_flags & OSCC_FLAG_NOSPC) == 0) &&
+ ((msfs->os_ffree < 32) || (msfs->os_bavail < used))))
+ cli->cl_oscc.oscc_flags |= OSCC_FLAG_NOSPC;
+ else if (unlikely(((cli->cl_oscc.oscc_flags & OSCC_FLAG_NOSPC) != 0) &&
+ (msfs->os_ffree > 64) && (msfs->os_bavail > (used << 1))))
+ cli->cl_oscc.oscc_flags &= ~OSCC_FLAG_NOSPC;
+
+ spin_unlock(&cli->cl_oscc.oscc_lock);
+