There's no real guidance on this for filesystem authors, so add a paragraph to vfs.txt that explains how this should be handled. Signed-off-by: Jeff Layton <jlayton@xxxxxxxxxx> --- Documentation/filesystems/vfs.txt | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/Documentation/filesystems/vfs.txt b/Documentation/filesystems/vfs.txt index 569211703721..527370fbab39 100644 --- a/Documentation/filesystems/vfs.txt +++ b/Documentation/filesystems/vfs.txt @@ -577,6 +577,13 @@ should clear PG_Dirty and set PG_Writeback. It can be actually written at any point after PG_Dirty is clear. Once it is known to be safe, PG_Writeback is cleared. +If there is an error during writeback, then the address_space should be +marked with an AS_EIO or AS_ENOSPC error, in order to ensure that the +error will be reported to the application at fsync or close. Most +writepage callers will do this automatically if writepage returns an +error, but writepages implementations generally need to ensure this +themselves. + Writeback makes use of a writeback_control structure... struct address_space_operations -- 2.9.3 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>
