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fuse_buf_copy: check if buffers are the same

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When copying fuse buffers, check if the source and destination are the
same and omit the copy as appropriate.  Also check if the source and
destination memory regions overlap and use memmove in that case.
This commit is contained in:
Miklos Szeredi
2010-11-10 11:41:21 +01:00
committed by Miklos Szeredi
parent 42bcaf301e
commit 4367f2df50
1 changed files with 13 additions and 1 deletions
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lib/buffer.c
+13 -1
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@@ -217,7 +217,16 @@ static ssize_t fuse_buf_copy_one(const struct fuse_buf *dst, size_t dst_off,
int dst_is_fd = dst->flags & FUSE_BUF_IS_FD;
if (!src_is_fd && !dst_is_fd) {
memcpy(dst->mem + dst_off, src->mem + src_off, len);
void *dstmem = dst->mem + dst_off;
void *srcmem = src->mem + src_off;
if (dstmem != srcmem) {
if (dstmem + len <= srcmem || srcmem + len <= dstmem)
memcpy(dstmem, srcmem, len);
else
memmove(dstmem, srcmem, len);
}
return len;
} else if (!src_is_fd) {
return fuse_buf_write(dst, dst_off, src, src_off, len);
@@ -259,6 +268,9 @@ ssize_t fuse_buf_copy(struct fuse_bufvec *dstv, struct fuse_bufvec *srcv,
{
size_t copied = 0;
if (dstv == srcv)
return fuse_buf_size(dstv);
for (;;) {
const struct fuse_buf *src = fuse_bufvec_current(srcv);
const struct fuse_buf *dst = fuse_bufvec_current(dstv);