Commit 45f7571a authored Jun 27, 2017 by Ben Walker Committed by Jim Harris Jun 27, 2017

blobfs: Fix bug when reading unwritten region after truncate



If a file is extended and then the new region is immediately
read without being written, there as a math error in the
buffer cache.

Change-Id: Ibd2bbe98c734f98df43eada799ed62de4081964b
Signed-off-by: Ben Walker <benjamin.walker@intel.com>
Reviewed-on: https://review.gerrithub.io/367265


Tested-by: SPDK Automated Test System <sys_sgsw@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>

parent 596f92f5

lib/blobfs/blobfs.c

+3 −3

Original line number	Diff line number	Diff line
		@@ -2075,13 +2075,13 @@ spdk_file_read(struct spdk_file file, struct spdk_io_channel _channel,

		file->open_for_writing = false;

		if (length == 0 \|\| offset >= file->length) {
		if (length == 0 \|\| offset >= file->append_pos) {
		pthread_spin_unlock(&file->lock);
		return 0;
		}

		if (offset + length > file->length) {
		length = file->length - offset;
		if (offset + length > file->append_pos) {
		length = file->append_pos - offset;
		}

		if (offset != file->next_seq_offset) {