From 1d22618b49b54056bc953ba53e8e29b5550b6d92 Mon Sep 17 00:00:00 2001
From: Marc Vef <vef@uni-mainz.de>
Date: Thu, 16 Feb 2023 10:18:32 +0100
Subject: [PATCH 1/2] Adding interception of fallocate and fadvise64 syscall.
 Not supported by GekkoFS at this time

---
 include/client/hooks.hpp |  6 ++++++
 src/client/hooks.cpp     | 24 ++++++++++++++++++++++++
 src/client/intercept.cpp | 12 ++++++++++++
 3 files changed, 42 insertions(+)

diff --git a/include/client/hooks.hpp b/include/client/hooks.hpp
index fa9ec424b..a287f6d3c 100644
--- a/include/client/hooks.hpp
+++ b/include/client/hooks.hpp
@@ -205,6 +205,12 @@ hook_fsync(unsigned int fd);
 int
 hook_getxattr(const char* path, const char* name, void* value, size_t size);
 
+int
+hook_fallocate(int fd, int mode, off_t offset, off_t len);
+
+int
+hook_fadvise64(int fd, off_t offset, off_t len, int advice);
+
 } // namespace gkfs::hook
 
 #endif
diff --git a/src/client/hooks.cpp b/src/client/hooks.cpp
index 9a54048c5..020d5040c 100644
--- a/src/client/hooks.cpp
+++ b/src/client/hooks.cpp
@@ -983,4 +983,28 @@ hook_getxattr(const char* path, const char* name, void* value, size_t size) {
     return syscall_no_intercept_wrapper(SYS_getxattr, path, name, value, size);
 }
 
+
+int
+hook_fallocate(int fd, int mode, off_t offset, off_t len) {
+    LOG(DEBUG, "{}() called with fd '{}' mode '{}' offset '{}' len '{}'",
+        __func__, fd, mode, offset, len);
+
+    if(CTX->file_map()->exist(fd)) {
+        return -ENOTSUP;
+    }
+    return syscall_no_intercept_wrapper(SYS_fallocate, fd, mode, offset, len);
+}
+
+int
+hook_fadvise64(int fd, off_t offset, off_t len, int advice) {
+    LOG(DEBUG, "{}() called with fd '{}' offset '{}' len '{}' advice '{}'",
+        __func__, fd, offset, len, advice);
+
+    if(CTX->file_map()->exist(fd)) {
+        return -ENOTSUP;
+    }
+    return syscall_no_intercept_wrapper(SYS_fadvise64, fd, offset, len, advice);
+}
+
+
 } // namespace gkfs::hook
diff --git a/src/client/intercept.cpp b/src/client/intercept.cpp
index 7a8a455fe..87792bfbd 100644
--- a/src/client/intercept.cpp
+++ b/src/client/intercept.cpp
@@ -785,6 +785,18 @@ hook(long syscall_number, long arg0, long arg1, long arg2, long arg3, long arg4,
                     reinterpret_cast<void*>(arg2), static_cast<size_t>(arg4));
             break;
 
+        case SYS_fallocate:
+            *result = gkfs::hook::hook_fallocate(
+                    static_cast<int>(arg0), static_cast<int>(arg1),
+                    static_cast<off_t>(arg2), static_cast<off_t>(arg3));
+            break;
+
+        case SYS_fadvise64:
+            *result = gkfs::hook::hook_fadvise64(
+                    static_cast<int>(arg0), static_cast<off_t>(arg1),
+                    static_cast<off_t>(arg2), static_cast<int>(arg4));
+            break;
+
         default:
             // ignore any other syscalls, i.e.: pass them on to the kernel
             // (syscalls forwarded to the kernel that return are logged in
-- 
GitLab


From 7cf9413bc8e28dc7b4349141995a676f003b25c8 Mon Sep 17 00:00:00 2001
From: Marc Vef <vef@uni-mainz.de>
Date: Sun, 9 Jun 2024 23:59:24 +0200
Subject: [PATCH 2/2] Update Changelog

---
 CHANGELOG.md | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index c2148a4f4..b84153468 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,8 @@ to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 ## [Unreleased]
 ### New
 
+- Added intercepton of `fadvise64()` and
+  `fallocate()` ([!161](https://storage.bsc.es/gitlab/hpc/gekkofs/-/merge_request/161)).
 - Added user library `gkfs_user_lib` that can be used to directly link to an
   application ([!171](https://storage.bsc.es/gitlab/hpc/gekkofs/-/merge_request/171)).
 - FMT10 and date removal, several dependencies updated. ([!172](https://storage.bsc.es/gitlab/hpc/gekkofs/-/merge_request/172)).
-- 
GitLab