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....193s sys 0m0.702s Note: the image is sparse, but nbdkit creates a fully allocated image. This may be a bug in nbdkit or qemu-img. --- plugins/file/file.c | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+) diff --git a/plugins/file/file.c b/plugins/file/file.c index 5daab63..a2cea4a 100644 --- a/plugins/file/file.c +++ b/plugins/file/file.c @@ -121,6 +121,7 @@ struct handle { int fd; bool can_punch_hole; bool can_zero_range; + bool can_fallocate; }; /* Create the per-connection handle. */ @@ -161,6 +162,8 @@ file_open (int readonly) h->can_zero_range = fals...

This is the third version to support efficient zero for block devices on older kernels (e.g. RHEL 7.5), and file systems that do not support yet FALLOC_FS_ZERO_RANGE (e.g. NFS 4.2). Changes since v2: - Revert file_can_trim change, since it is too late to change the value after negotiation. Changing the capability dinamically may be useful internally, but it should be done via other means. -

...include/nbdkit-plugin.h nbdkit_file_plugin_la_CPPFLAGS = \ - -I$(top_srcdir)/include + -I$(top_srcdir)/include \ + -I$(top_srcdir)/common/include nbdkit_file_plugin_la_CFLAGS = \ $(WARNINGS_CFLAGS) nbdkit_file_plugin_la_LDFLAGS = \ diff --git a/plugins/file/file.c b/plugins/file/file.c index a2cea4a..6c8c78e 100644 --- a/plugins/file/file.c +++ b/plugins/file/file.c @@ -41,14 +41,21 @@ #include <unistd.h> #include <sys/types.h> #include <sys/stat.h> +#include <sys/ioctl.h> #include <errno.h> #if defined(__linux__) && !defined(FALLOC_FL_PUNCH_HOLE)...