[Minios-devel] [UNIKRAFT PATCH 3/3] lib/vfscore: Import posix_fadvise() from OsV

[Costin Lupu <costin.lupu@xxxxxxxxx>]

Copied and tabified from official OsV git repo
https://github.com/cloudius-systems/osv.git, commit ee7a2cd4.

Signed-off-by: Costin Lupu <costin.lupu@xxxxxxxxx>
---
 lib/vfscore/exportsyms.uk |  1 +
 lib/vfscore/main.c        | 17 +++++++++++++++++
 2 files changed, 18 insertions(+)

diff --git a/lib/vfscore/exportsyms.uk b/lib/vfscore/exportsyms.uk
index 225cd730..2b8bd43d 100644
--- a/lib/vfscore/exportsyms.uk
+++ b/lib/vfscore/exportsyms.uk
@@ -118,3 +118,4 @@ utimensat
 futimens
 utimes
 lutimes
+posix_fadvise
diff --git a/lib/vfscore/main.c b/lib/vfscore/main.c
index 4e99911f..cf84a0e0 100644
--- a/lib/vfscore/main.c
+++ b/lib/vfscore/main.c
@@ -2058,6 +2058,23 @@ ssize_t sendfile(int out_fd, int in_fd, off_t *_offset, 
size_t count)
 LFS64(sendfile);
 #endif
 
+int posix_fadvise(int fd __unused, off_t offset __unused, off_t len __unused,
+               int advice)
+{
+       switch (advice) {
+       case POSIX_FADV_NORMAL:
+       case POSIX_FADV_SEQUENTIAL:
+       case POSIX_FADV_RANDOM:
+       case POSIX_FADV_NOREUSE:
+       case POSIX_FADV_WILLNEED:
+       case POSIX_FADV_DONTNEED:
+               return 0;
+       default:
+               return EINVAL;
+       }
+}
+LFS64(posix_fadvise);
+
 mode_t umask(mode_t newmask)
 {
        return ukarch_exchange_n(&global_umask, newmask);
-- 
2.20.1


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