From ed8713cc0f72bca9e0327553aaea135b84d7fda5 Mon Sep 17 00:00:00 2001
From: Christopher Haster <chaster@utexas.edu>
Date: Mon, 22 Jan 2018 17:30:47 -0600
Subject: [PATCH] Added support for truncate on files

---
 lfs_fuse.c | 22 +++++++++++++++++++---
 1 file changed, 19 insertions(+), 3 deletions(-)

diff --git a/lfs_fuse.c b/lfs_fuse.c
index a7f53ed..6ebcdb4 100644
--- a/lfs_fuse.c
+++ b/lfs_fuse.c
@@ -286,12 +286,28 @@ int lfs_fuse_create(const char *path, mode_t mode, struct fuse_file_info *fi) {
     return lfs_fuse_fsync(path, 0, fi);
 }
 
-// unsupported functions
+int lfs_fuse_ftruncate(const char *path, off_t size,
+        struct fuse_file_info *fi) {
+    lfs_file_t *file = (lfs_file_t*)fi->fh;
+    return lfs_file_truncate(&lfs, file, size);
+}
+
 int lfs_fuse_truncate(const char *path, off_t size) {
-    // not supported, fail
-    return -EPERM;
+    lfs_file_t file;
+    int err = lfs_file_open(&lfs, &file, path, LFS_O_WRONLY);
+    if (err) {
+        return err;
+    }
+
+    err = lfs_file_truncate(&lfs, &file, size);
+    if (err) {
+        return err;
+    }
+
+    return lfs_file_close(&lfs, &file);
 }
 
+// unsupported functions
 int lfs_fuse_link(const char *from, const char *to) {
     // not supported, fail
     return -EPERM;