Introduce two new fuse commands to setup/remove memory mappings. This
will be used to setup/tear down file mapping in dax window.
Signed-off-by: Vivek Goyal <vgoyal@xxxxxxxxxx>
Signed-off-by: Peng Tao <tao.peng@xxxxxxxxxxxxxxxxx>
---
include/uapi/linux/fuse.h | 37 +++++++++++++++++++++++++++++++++++++
1 file changed, 37 insertions(+)
diff --git a/include/uapi/linux/fuse.h b/include/uapi/linux/fuse.h
index 5b85819e045f..62633555d547 100644
--- a/include/uapi/linux/fuse.h
+++ b/include/uapi/linux/fuse.h
@@ -894,4 +894,41 @@ struct fuse_copy_file_range_in {
uint64_t flags;
};
+#define FUSE_SETUPMAPPING_ENTRIES 8
+#define FUSE_SETUPMAPPING_FLAG_WRITE (1ull << 0)
+struct fuse_setupmapping_in {
+ /* An already open handle */
+ uint64_t fh;
+ /* Offset into the file to start the mapping */
+ uint64_t foffset;
+ /* Length of mapping required */
+ uint64_t len;
+ /* Flags, FUSE_SETUPMAPPING_FLAG_* */
+ uint64_t flags;
+ /* Offset in Memory Window */
+ uint64_t moffset;
+};
+
+struct fuse_setupmapping_out {
+ /* Offsets into the cache of mappings */
+ uint64_t coffset[FUSE_SETUPMAPPING_ENTRIES];
+ /* Lengths of each mapping */
+ uint64_t len[FUSE_SETUPMAPPING_ENTRIES];
+};
+
+struct fuse_removemapping_in {
+ /* number of fuse_removemapping_one follows */
+ uint32_t count;
+};
+
+struct fuse_removemapping_one {
+ /* Offset into the dax window start the unmapping */
+ uint64_t moffset;
+ /* Length of mapping required */
+ uint64_t len;
+};
+
+#define FUSE_REMOVEMAPPING_MAX_ENTRY \
+ (PAGE_SIZE / sizeof(struct fuse_removemapping_one))
+
#endif /* _LINUX_FUSE_H */
--
2.20.1
