[PATCH] erofs-utils: lib: fix erofs_pack_file_from_fd()

[Gao Xiang]

If sendfile() fails, it should fall back to a plain copy.

Coverity-id: 554788
Fixes: 84bae6acdbee ("erofs-utils: lib: keep full data until the fragment is 
committed")
Signed-off-by: Gao Xiang <hsiang...@linux.alibaba.com>
---
 lib/fragments.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/lib/fragments.c b/lib/fragments.c
index d63995e..e65963b 100644
--- a/lib/fragments.c
+++ b/lib/fragments.c
@@ -242,6 +242,9 @@ int erofs_pack_file_from_fd(struct erofs_inode *inode, int 
fd, u32 tofh)
        char *memblock;
        bool onheap = false;
 
+       if (__erofs_unlikely(!inode->i_size))
+               return 0;
+
        offset = lseek(epi->fd, 0, SEEK_CUR);
        if (offset < 0)
                return -errno;
@@ -256,7 +259,7 @@ int erofs_pack_file_from_fd(struct erofs_inode *inode, int 
fd, u32 tofh)
                        sz = min_t(u64, remaining, UINT_MAX);
                        rc = sendfile(epi->fd, fd, NULL, sz);
                        if (rc < 0)
-                               goto out;
+                               break;
                        remaining -= rc;
                } while (remaining);
 #endif
-- 
2.43.5