1 files changed, 15 insertions, 24 deletions

diff --git a/reftable/blocksource.c b/reftable/blocksource.c
index 8331b34e82..8c41e3c70f 100644
--- a/reftable/blocksource.c
+++ b/reftable/blocksource.c
@@ -76,8 +76,8 @@ struct reftable_block_source malloc_block_source(void)
 }
 
 struct file_block_source {
-	int fd;
 	uint64_t size;
+	unsigned char *data;
 };
 
 static uint64_t file_size(void *b)
@@ -87,19 +87,12 @@ static uint64_t file_size(void *b)
 
 static void file_return_block(void *b, struct reftable_block *dest)
 {
-	if (dest->len)
-		memset(dest->data, 0xff, dest->len);
-	reftable_free(dest->data);
 }
 
-static void file_close(void *b)
+static void file_close(void *v)
 {
-	int fd = ((struct file_block_source *)b)->fd;
-	if (fd > 0) {
-		close(fd);
-		((struct file_block_source *)b)->fd = 0;
-	}
-
+	struct file_block_source *b = v;
+	munmap(b->data, b->size);
 	reftable_free(b);
 }
 
@@ -108,9 +101,7 @@ static int file_read_block(void *v, struct reftable_block *dest, uint64_t off,
 {
 	struct file_block_source *b = v;
 	assert(off + size <= b->size);
-	dest->data = reftable_malloc(size);
-	if (pread(b->fd, dest->data, size, off) != size)
-		return -1;
+	dest->data = b->data + off;
 	dest->len = size;
 	return size;
 }
@@ -125,26 +116,26 @@ static struct reftable_block_source_vtable file_vtable = {
 int reftable_block_source_from_file(struct reftable_block_source *bs,
 				    const char *name)
 {
-	struct stat st = { 0 };
-	int err = 0;
-	int fd = open(name, O_RDONLY);
-	struct file_block_source *p = NULL;
+	struct file_block_source *p;
+	struct stat st;
+	int fd;
+
+	fd = open(name, O_RDONLY);
 	if (fd < 0) {
-		if (errno == ENOENT) {
+		if (errno == ENOENT)
 			return REFTABLE_NOT_EXIST_ERROR;
-		}
 		return -1;
 	}
 
-	err = fstat(fd, &st);
-	if (err < 0) {
+	if (fstat(fd, &st) < 0) {
 		close(fd);
 		return REFTABLE_IO_ERROR;
 	}
 
-	p = reftable_calloc(sizeof(struct file_block_source));
+	p = reftable_calloc(sizeof(*p));
 	p->size = st.st_size;
-	p->fd = fd;
+	p->data = xmmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
+	close(fd);
 
 	assert(!bs->ops);
 	bs->ops = &file_vtable;