added flush() call

2 files changed, 19 insertions, 7 deletions

diff --git a/include/fuse.h b/include/fuse.h
index 1cb7bbf..3babaf6 100644
--- a/include/fuse.h
+++ b/include/fuse.h
@@ -86,15 +86,25 @@ typedef int (*fuse_dirfil_t) (fuse_dirh_t h, const char *name, int type);
  *  - release() is called when an open file has:
  *       1) all file descriptors closed
  *       2) all memory mappings unmapped
- *    For every open() call there will be exactly one release() call
- *    with the same flags.  It is possible to have a file opened more
- *    than once, in which case only the last release will mean, that
- *    no more reads/writes will happen on the file.  This call need
- *    only be implemented if this information is required, otherwise
- *    set this function to NULL.
+ *  For every open() call there will be exactly one release() call
+ *  with the same flags.  It is possible to have a file opened more
+ *  than once, in which case only the last release will mean, that no
+ *  more reads/writes will happen on the file.  The return value of
+ *  release is ignored.  This call need only be implemented if this
+ *  information is required, otherwise set this function to NULL.
+ * 
+ *  - flush() is called when close() has been called on an open file.
+ *  NOTE: this does not mean that the file is released (e.g. after
+ *  fork() an open file will have two references which both must be
+ *  closed before the file is released).  The flush() method can be
+ *  called more than once for each open().  The return value of
+ *  flush() is passed on to the close() system call.  Implementing
+ *  this call is optional.  If it is not needed by the filesystem,
+ *  then set the callback pointer to NULL.
  * 
  *  - fsync() has a boolean 'datasync' parameter which if TRUE then do
- * an fdatasync() operation.  */
+ *  an fdatasync() operation.  
+ */
 struct fuse_operations {
     int (*getattr)     (const char *, struct stat *);
     int (*readlink)    (const char *, char *, size_t);
@@ -114,6 +124,7 @@ struct fuse_operations {
     int (*read)        (const char *, char *, size_t, off_t);
     int (*write)       (const char *, const char *, size_t, off_t);
     int (*statfs)      (const char *, struct statfs *);
+    int (*flush)       (const char *);
     int (*release)     (const char *, int);
     int (*fsync)       (const char *, int);
     int (*setxattr)    (const char *, const char *, const char *, size_t, int);
diff --git a/include/linux/fuse.h b/include/linux/fuse.h
index 63cf167..027cb5e 100644
--- a/include/linux/fuse.h
+++ b/include/linux/fuse.h
@@ -82,6 +82,7 @@ enum fuse_opcode {
 	FUSE_GETXATTR      = 22,
 	FUSE_LISTXATTR     = 23,
 	FUSE_REMOVEXATTR   = 24,
+	FUSE_FLUSH         = 25,
 };
 
 /* Conservative buffer size for the client */