[UNIKRAFT PATCH 3/3] lib/vfscore: Add preadv tracepoints

[Alexander Jung <a.jung@xxxxxxxxxxx>]

Signed-off-by: Alexander Jung <alexander.jung@xxxxxxxxx>
---
 lib/vfscore/main.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/lib/vfscore/main.c b/lib/vfscore/main.c
index 0cbcd21..13697b8 100644
--- a/lib/vfscore/main.c
+++ b/lib/vfscore/main.c
@@ -355,12 +355,18 @@ UK_SYSCALL_DEFINE(ssize_t, write, int, fd, const void *, 
buf, size_t, count)
        return pwrite(fd, buf, count, -1);
 }
 
+UK_TRACEPOINT(trace_vfs_preadv, "%d %p 0x%x 0x%x", int, const struct iovec*,
+             int, off_t);
+UK_TRACEPOINT(trace_vfs_preadv_ret, "0x%x", ssize_t);
+UK_TRACEPOINT(trace_vfs_preadv_err, "%d", int);
+
 ssize_t preadv(int fd, const struct iovec *iov, int iovcnt, off_t offset)
 {
        struct vfscore_file *fp;
        size_t bytes;
        int error;
 
+       trace_vfs_preadv(fd, iov, iovcnt, offset);
        error = fget(fd, &fp);
        if (error)
                goto out_errno;
@@ -383,6 +389,7 @@ ssize_t preadv(int fd, const struct iovec *iov, int iovcnt, 
off_t offset)
                goto out_errno_fdrop;
 
        fdrop(fp);
+       trace_vfs_preadv_ret(bytes);
        return bytes;
 
 out_errno_fdrop:
@@ -390,6 +397,7 @@ out_errno_fdrop:
 
 out_errno:
        errno = error;
+       trace_vfs_preadv_err(error);
        return -1;
 }
 
-- 
2.11.0