blobfs: change the return type of spdk_file_truncate

Change-Id: I29347d7b7be0237d7d604c7cd7363fa08a0cd025
Signed-off-by: Ziye Yang <optimistyzy@gmail.com>
Reviewed-on: https://review.gerrithub.io/420133
Chandler-Test-Pool: SPDK Automated Test System <sys_sgsw@intel.com>
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
Reviewed-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com>
Reviewed-by: Changpeng Liu <changpeng.liu@intel.com>

CHANGELOG.md

@@ -87,6 +87,11 @@ IOAT for copy engine is disabled by default. It can be enabled by specifying the
 option with "Yes" in `[Ioat]` section of the configuration file. The Disable option is
 now deprecated and will be removed in a future release.
 
+### blobfs
+
+Change the return type of spdk_file_truncate from void to int. The purpose is to catch
+the `NOMEM` error condition.
+
 ## v18.04: Logical Volume Snapshot/Clone, iSCSI Initiator, Bdev QoS, VPP Userspace TCP/IP
 
 ### vhost

include/spdk/blobfs.h

@@ -301,8 +301,10 @@ spdk_fs_iter spdk_fs_iter_next(spdk_fs_iter iter);
  * \param file File to truncate.
  * \param channel The I/O channel used to allocate file request.
  * \param length New size in bytes of the file.
+ *
+ * \return 0 on success, negative errno on failure.
  */
-void spdk_file_truncate(struct spdk_file *file, struct spdk_io_channel *channel,
+int spdk_file_truncate(struct spdk_file *file, struct spdk_io_channel *channel,
 		       uint64_t length);
 
 /**

lib/blobfs/blobfs.c

@@ -1501,7 +1501,7 @@ __truncate(void *arg)
 				 args->fn.file_op, args->arg);
 }
 
-void
+int
 spdk_file_truncate(struct spdk_file *file, struct spdk_io_channel *_channel,
 		   uint64_t length)
 {
@@ -1510,7 +1510,9 @@ spdk_file_truncate(struct spdk_file *file, struct spdk_io_channel *_channel,
 	struct spdk_fs_cb_args *args;
 
 	req = alloc_fs_request(channel);
-	assert(req != NULL);
+	if (req == NULL) {
+		return -ENOMEM;
+	}
 
 	args = &req->args;
 
@@ -1522,6 +1524,8 @@ spdk_file_truncate(struct spdk_file *file, struct spdk_io_channel *_channel,
 	channel->send_request(__truncate, req);
 	sem_wait(&channel->sem);
 	free_fs_request(req);
+
+	return 0;
 }
 
 static void

lib/rocksdb/env_spdk.cc

@@ -207,9 +207,15 @@ public:
 
 	virtual Status Truncate(uint64_t size) override
 	{
-		spdk_file_truncate(mFile, g_sync_args.channel, size);
+		int rc;
+		rc = spdk_file_truncate(mFile, g_sync_args.channel, size);
+		if (!rc) {
 			mSize = size;
 			return Status::OK();
+		} else {
+			errno = -rc;
+			return Status::IOError(spdk_file_get_name(mFile), strerror(errno));
+		}
 	}
 	virtual Status Close() override
 	{
@@ -246,8 +252,15 @@ public:
 	}
 	virtual Status Allocate(uint64_t offset, uint64_t len) override
 	{
-		spdk_file_truncate(mFile, g_sync_args.channel, offset + len);
+		int rc;
+
+		rc = spdk_file_truncate(mFile, g_sync_args.channel, offset + len);
+		if (!rc) {
 			return Status::OK();
+		} else {
+			errno = -rc;
+			return Status::IOError(spdk_file_get_name(mFile), strerror(errno));
+		}
 	}
 	virtual Status RangeSync(uint64_t offset, uint64_t nbytes) override
 	{

test/blobfs/fuse/fuse.c

@@ -143,7 +143,11 @@ spdk_fuse_truncate(const char *path, off_t size, struct fuse_file_info *fi)
 		return -rc;
 	}
 
-	spdk_file_truncate(file, g_channel, size);
+	rc = spdk_file_truncate(file, g_channel, size);
+	if (rc != 0) {
+		return -rc;
+	}
+
 	spdk_file_close(file, g_channel);
 
 	return 0;

test/unit/lib/blobfs/blobfs_sync_ut/blobfs_sync_ut.c

@@ -180,13 +180,15 @@ cache_write(void)
 	SPDK_CU_ASSERT_FATAL(g_file != NULL);
 
 	length = (4 * 1024 * 1024);
-	spdk_file_truncate(g_file, channel, length);
+	rc = spdk_file_truncate(g_file, channel, length);
+	CU_ASSERT(rc == 0);
 
 	spdk_file_write(g_file, channel, buf, 0, sizeof(buf));
 
 	CU_ASSERT(spdk_file_get_length(g_file) == length);
 
-	spdk_file_truncate(g_file, channel, sizeof(buf));
+	rc = spdk_file_truncate(g_file, channel, sizeof(buf));
+	CU_ASSERT(rc == 0);
 
 	spdk_file_close(g_file, channel);
 	rc = spdk_fs_delete_file(g_fs, channel, "testfile");
@@ -218,7 +220,8 @@ cache_write_null_buffer(void)
 	SPDK_CU_ASSERT_FATAL(g_file != NULL);
 
 	length = 0;
-	spdk_file_truncate(g_file, channel, length);
+	rc = spdk_file_truncate(g_file, channel, length);
+	CU_ASSERT(rc == 0);
 
 	rc = spdk_file_write(g_file, channel, NULL, 0, 0);
 	CU_ASSERT(rc == 0);