From 4259c8f7ebc9f5d167556ed142e82e8232706de6 Mon Sep 17 00:00:00 2001
From: Jakob Unterwurzacher <jakobunt@gmail.com>
Date: Sun, 24 Jan 2016 19:43:21 +0100
Subject: [PATCH] Only warn once for unsupported fallocate(2) and truncate(2)

Also, print the inode number in Ftruncate warnings.
---
 pathfs_frontend/file.go | 12 +++++++++---
 pathfs_frontend/fs.go   |  8 +++++++-
 2 files changed, 16 insertions(+), 4 deletions(-)

diff --git a/pathfs_frontend/file.go b/pathfs_frontend/file.go
index 522b9c1..ceb9216 100644
--- a/pathfs_frontend/file.go
+++ b/pathfs_frontend/file.go
@@ -336,7 +336,7 @@ func (f *file) Truncate(newSize uint64) fuse.Status {
 		err := syscall.Ftruncate(int(f.fd.Fd()), 0)
 		f.fdLock.Unlock()
 		if err != nil {
-			cryptfs.Warn.Printf("Ftruncate(fd, 0) returned error: %v", err)
+			cryptfs.Warn.Printf("ino%d: Ftruncate(fd, 0) returned error: %v", f.ino, err)
 			return fuse.ToStatus(err)
 		}
 		// Truncate to zero kills the file header
@@ -348,7 +348,7 @@ func (f *file) Truncate(newSize uint64) fuse.Status {
 	// the file
 	fi, err := f.fd.Stat()
 	if err != nil {
-		cryptfs.Warn.Printf("Truncate: Fstat failed: %v", err)
+		cryptfs.Warn.Printf("ino%d: Truncate: Fstat failed: %v", f.ino, err)
 		return fuse.ToStatus(err)
 	}
 	oldSize := f.cfs.CipherSizeToPlainSize(uint64(fi.Size()))
@@ -455,8 +455,14 @@ func (f *file) GetAttr(a *fuse.Attr) fuse.Status {
 }
 
 // Allocate - FUSE call, fallocate(2)
+var allocateWarned bool
+
 func (f *file) Allocate(off uint64, sz uint64, mode uint32) fuse.Status {
-	cryptfs.Warn.Printf("Fallocate is not supported, returning ENOSYS - see https://github.com/rfjakob/gocryptfs/issues/1")
+	// Only warn once
+	if !allocateWarned {
+		cryptfs.Warn.Printf("fallocate(2) is not supported, returning ENOSYS - see https://github.com/rfjakob/gocryptfs/issues/1")
+		allocateWarned = true
+	}
 	return fuse.ENOSYS
 }
 
diff --git a/pathfs_frontend/fs.go b/pathfs_frontend/fs.go
index c7dfc82..2b26f6f 100644
--- a/pathfs_frontend/fs.go
+++ b/pathfs_frontend/fs.go
@@ -198,8 +198,14 @@ func (fs *FS) Mknod(path string, mode uint32, dev uint32, context *fuse.Context)
 	return fs.FileSystem.Mknod(cPath, mode, dev, context)
 }
 
+var truncateWarned bool
+
 func (fs *FS) Truncate(path string, offset uint64, context *fuse.Context) (code fuse.Status) {
-	cryptfs.Warn.Printf("Truncate of a closed file is not supported, returning ENOSYS")
+	// Only warn once
+	if !truncateWarned {
+		cryptfs.Warn.Printf("truncate(2) is not supported, returning ENOSYS - use ftruncate(2)")
+		truncateWarned = true
+	}
 	return fuse.ENOSYS
 }