[XFS] Introduce two new mount options (nolargeio/largeio) to allow
filesystems to expose the filesystem stripe width in stat(2) rather than
the page cache size. This allows applications requiring high bandwidth to
easily determine the optimum I/O size for the underlying filesystem. The
default is to report the page cache size (i.e. "nolargeio").
SGI-PV: 942818
SGI-Modid: xfs-linux:xfs-kern:23830a
Signed-off-by: David Chinner <dgc@sgi.com>
Signed-off-by: Nathan Scott <nathans@sgi.com>
diff --git a/fs/xfs/xfs_clnt.h b/fs/xfs/xfs_clnt.h
index c93cb28..90d9d56 100644
--- a/fs/xfs/xfs_clnt.h
+++ b/fs/xfs/xfs_clnt.h
@@ -106,5 +106,7 @@
#define XFSMNT_IHASHSIZE 0x20000000 /* inode hash table size */
#define XFSMNT_DIRSYNC 0x40000000 /* sync creat,link,unlink,rename
* symlink,mkdir,rmdir,mknod */
+#define XFSMNT_COMPAT_IOSIZE 0x80000000 /* don't report large preferred
+ * I/O size in stat() */
#endif /* __XFS_CLNT_H__ */