index-pack: Loop over pread until data loading is complete.
A filesystem might not be able to completely supply our pread
request in one system call, such as if we are reading data from a
network file system and the requested length is just simply huge.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>
diff --git a/index-pack.c b/index-pack.c
index 72e0962..f917744 100644
--- a/index-pack.c
+++ b/index-pack.c
@@ -277,13 +277,19 @@
{
unsigned long from = obj[0].offset + obj[0].hdr_size;
unsigned long len = obj[1].offset - from;
+ unsigned long rdy = 0;
unsigned char *src, *data;
z_stream stream;
int st;
src = xmalloc(len);
- if (pread(pack_fd, src, len, from) != len)
- die("cannot pread pack file: %s", strerror(errno));
+ data = src;
+ do {
+ ssize_t n = pread(pack_fd, data + rdy, len - rdy, from + rdy);
+ if (n <= 0)
+ die("cannot pread pack file: %s", strerror(errno));
+ rdy += n;
+ } while (rdy < len);
data = xmalloc(obj->size);
memset(&stream, 0, sizeof(stream));
stream.next_out = data;
