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-rw-r--r--include/fuse.h7
1 files changed, 4 insertions, 3 deletions
diff --git a/include/fuse.h b/include/fuse.h
index 3df61b1..a92d5ee 100644
--- a/include/fuse.h
+++ b/include/fuse.h
@@ -772,9 +772,10 @@ struct fuse_operations {
* additional cost of transferring data through the FUSE kernel module
* to user space (glibc) and then back into the FUSE filesystem again.
*
- * In case this method is not implemented, glibc falls back to reading
- * data from the source and writing to the destination. Effectively
- * doing an inefficient copy of the data.
+ * In case this method is not implemented, applications are expected to
+ * fall back to a regular file copy. (Some glibc versions did this
+ * emulation automatically, but the emulation has been removed from all
+ * glibc release branches.)
*/
ssize_t (*copy_file_range) (const char *path_in,
struct fuse_file_info *fi_in,