8:50 a.m.
Upgrade this plugin to version 2 of the API. The main change is
implementing FUA support.
---
plugins/file/file.c | 62 ++++++++++++++++++++++++++++++---------------
1 file changed, 42 insertions(+), 20 deletions(-)
diff --git a/plugins/file/file.c b/plugins/file/file.c
index 2a8c9b5..dcff0ee 100644
--- a/plugins/file/file.c
+++ b/plugins/file/file.c
@@ -52,6 +52,8 @@
#include <linux/fs.h> /* For BLKZEROOUT */
#endif
+#define NBDKIT_API_VERSION 2
+
#include <nbdkit-plugin.h>
#include "isaligned.h"
@@ -263,9 +265,30 @@ file_can_trim (void *handle)
#endif
}
+static int
+file_can_fua (void *handle)
+{
+ return NBDKIT_FUA_NATIVE;
+}
+
+/* Flush the file to disk. */
+static int
+file_flush (void *handle, uint32_t flags)
+{
+ struct handle *h = handle;
+
+ if (fdatasync (h->fd) == -1) {
+ nbdkit_error ("fdatasync: %m");
+ return -1;
+ }
+
+ return 0;
+}
+
/* Read data from the file. */
static int
-file_pread (void *handle, void *buf, uint32_t count, uint64_t offset)
+file_pread (void *handle, void *buf, uint32_t count, uint64_t offset,
+ uint32_t flags)
{
struct handle *h = handle;
@@ -289,7 +312,8 @@ file_pread (void *handle, void *buf, uint32_t count, uint64_t offset)
/* Write data to the file. */
static int
-file_pwrite (void *handle, const void *buf, uint32_t count, uint64_t offset)
+file_pwrite (void *handle, const void *buf, uint32_t count, uint64_t offset,
+ uint32_t flags)
{
struct handle *h = handle;
@@ -304,6 +328,9 @@ file_pwrite (void *handle, const void *buf, uint32_t count, uint64_t
offset)
offset += r;
}
+ if ((flags & NBDKIT_FLAG_FUA) && file_flush (handle, 0) == -1)
+ return -1;
+
return 0;
}
@@ -323,20 +350,20 @@ do_fallocate(int fd, int mode, off_t offset, off_t len)
/* Write zeroes to the file. */
static int
-file_zero (void *handle, uint32_t count, uint64_t offset, int may_trim)
+file_zero (void *handle, uint32_t count, uint64_t offset, uint32_t flags)
{
struct handle *h = handle;
int r;
#ifdef FALLOC_FL_PUNCH_HOLE
- if (h->can_punch_hole && may_trim) {
+ if (h->can_punch_hole && (flags & NBDKIT_FLAG_MAY_TRIM)) {
r = do_fallocate (h->fd, FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE,
offset, count);
if (r == 0) {
if (file_debug_zero)
nbdkit_debug ("h->can_punch_hole && may_trim: "
"zero succeeded using fallocate");
- return 0;
+ goto out;
}
if (errno != EOPNOTSUPP) {
@@ -355,7 +382,7 @@ file_zero (void *handle, uint32_t count, uint64_t offset, int
may_trim)
if (file_debug_zero)
nbdkit_debug ("h->can_zero-range: "
"zero succeeded using fallocate");
- return 0;
+ goto out;
}
if (errno != EOPNOTSUPP) {
@@ -380,7 +407,7 @@ file_zero (void *handle, uint32_t count, uint64_t offset, int
may_trim)
if (file_debug_zero)
nbdkit_debug ("h->can_punch_hole && h->can_fallocate:
"
"zero succeeded using fallocate");
- return 0;
+ goto out;
}
if (errno != EOPNOTSUPP) {
@@ -410,7 +437,7 @@ file_zero (void *handle, uint32_t count, uint64_t offset, int
may_trim)
if (file_debug_zero)
nbdkit_debug ("h->can_zeroout && IS_ALIGNED: "
"zero succeeded using BLKZEROOUT");
- return 0;
+ goto out;
}
if (errno != ENOTTY) {
@@ -427,25 +454,16 @@ file_zero (void *handle, uint32_t count, uint64_t offset, int
may_trim)
nbdkit_debug ("zero falling back to writing");
errno = EOPNOTSUPP;
return -1;
-}
-/* Flush the file to disk. */
-static int
-file_flush (void *handle)
-{
- struct handle *h = handle;
-
- if (fdatasync (h->fd) == -1) {
- nbdkit_error ("fdatasync: %m");
+ out:
+ if ((flags & NBDKIT_FLAG_FUA) && file_flush (handle, 0) == -1)
return -1;
- }
-
return 0;
}
/* Punch a hole in the file. */
static int
-file_trim (void *handle, uint32_t count, uint64_t offset)
+file_trim (void *handle, uint32_t count, uint64_t offset, uint32_t flags)
{
#ifdef FALLOC_FL_PUNCH_HOLE
struct handle *h = handle;
@@ -470,6 +488,9 @@ file_trim (void *handle, uint32_t count, uint64_t offset)
}
#endif
+ if ((flags & NBDKIT_FLAG_FUA) && file_flush (handle, 0) == -1)
+ return -1;
+
return 0;
}
@@ -487,6 +508,7 @@ static struct nbdkit_plugin plugin = {
.close = file_close,
.get_size = file_get_size,
.can_trim = file_can_trim,
+ .can_fua = file_can_fua,
.pread = file_pread,
.pwrite = file_pwrite,
.flush = file_flush,
--
2.19.2