Merge tag 'dm-4.9-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/device...

[cascardo/linux.git] / include / linux / iomap.h

diff --git a/include/linux/iomap.h b/include/linux/iomap.h
index 3d70ece..7892f55 100644 (file)
--- a/include/linux/iomap.h
+++ b/include/linux/iomap.h
@@ -19,9 +19,15 @@ struct vm_fault;
 #define IOMAP_UNWRITTEN        0x04    /* blocks allocated @blkno in unwritten state */
 
 /*
- * Flags for iomap mappings:
+ * Flags for all iomap mappings:
  */
-#define IOMAP_F_MERGED 0x01    /* contains multiple blocks/extents */
+#define IOMAP_F_NEW    0x01    /* blocks have been newly allocated */
+
+/*
+ * Flags that only need to be reported for IOMAP_REPORT requests:
+ */
+#define IOMAP_F_MERGED 0x10    /* contains multiple blocks/extents */
+#define IOMAP_F_SHARED 0x20    /* block shared with another file */
 
 /*
  * Magic value for blkno:
@@ -40,8 +46,9 @@ struct iomap {
 /*
  * Flags for iomap_begin / iomap_end.  No flag implies a read.
  */
-#define IOMAP_WRITE            (1 << 0)
-#define IOMAP_ZERO             (1 << 1)
+#define IOMAP_WRITE            (1 << 0) /* writing, must allocate blocks */
+#define IOMAP_ZERO             (1 << 1) /* zeroing operation, may skip holes */
+#define IOMAP_REPORT           (1 << 2) /* report extent status, e.g. FIEMAP */
 
 struct iomap_ops {
        /*
@@ -64,6 +71,8 @@ struct iomap_ops {
 
 ssize_t iomap_file_buffered_write(struct kiocb *iocb, struct iov_iter *from,
                struct iomap_ops *ops);
+int iomap_file_dirty(struct inode *inode, loff_t pos, loff_t len,
+               struct iomap_ops *ops);
 int iomap_zero_range(struct inode *inode, loff_t pos, loff_t len,
                bool *did_zero, struct iomap_ops *ops);
 int iomap_truncate_page(struct inode *inode, loff_t pos, bool *did_zero,