Signed-off-by: Dexuan Cui <de...@microsoft.com> Reviewed-by: K. Y. Srinivasan <k...@microsoft.com> --- tools/hv/hv_vss_daemon.c | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+)
diff --git a/tools/hv/hv_vss_daemon.c b/tools/hv/hv_vss_daemon.c index 6a213b8..19567c5 100644 --- a/tools/hv/hv_vss_daemon.c +++ b/tools/hv/hv_vss_daemon.c @@ -51,6 +51,27 @@ static int vss_do_freeze(char *dir, unsigned int cmd, char *fs_op) if (fd < 0) return 1; ret = ioctl(fd, cmd, 0); + + /* + * If a partition is mounted more than once, only the first + * FREEZE/THAW can succeed and the later ones will get + * EBUSY/EINVAL respectively: there could be 2 cases: + * 1) a user may mount the same partition to differnt directories + * by mistake or on purpose; + * 2) The subvolume of btrfs appears to have the same partition + * mounted more than once. + */ + if (ret) { + if ((cmd == FIFREEZE && errno == EBUSY) || + (cmd == FITHAW && errno == EINVAL)) { + syslog(LOG_INFO, "VSS: %s of %s: %s: ignored\n", + fs_op, dir, + errno == EBUSY ? "EBUSY" : "EINVAL"); + close(fd); + return 0; + } + } + syslog(LOG_INFO, "VSS: %s of %s: %s\n", fs_op, dir, strerror(errno)); close(fd); return !!ret; -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/