[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>

1 files changed, 2 insertions, 0 deletions

diff --git a/fs/xfs/xfs_clnt.h b/fs/xfs/xfs_clnt.h
index c93cb282f3d8..90d9d56c4dc8 100644
--- a/fs/xfs/xfs_clnt.h
+++ b/fs/xfs/xfs_clnt.h
@@ -106,5 +106,7 @@ struct xfs_mount_args {
 #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__ */