[PATCH 16/16] GFS2: Exported functions
Export the routine for initialising ra_state structure. This allows
GFS2 to use the standard kernel readahead when reading its internal
files. Also a modification to the read path for direct i/o allows
a 0 return from the direct i/o function provided by the filesystem
to result in a "normal" buffered i/o. GFS2 uses this in cases where
direct i/o isn't possible for some reason (e.g. the file is "stuffed"
and this not aligned on disk).
Signed-off-by: Steven Whitehouse <[email protected]>
Signed-off-by: David Teigland <[email protected]>
mm/filemap.c | 3 ++-
mm/readahead.c | 1 +
2 files changed, 3 insertions(+), 1 deletion(-)
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -1181,7 +1181,8 @@ __generic_file_aio_read(struct kiocb *io
*ppos = pos + retval;
}
file_accessed(filp);
- goto out;
+ if (retval != 0)
+ goto out;
}
retval = 0;
--- a/mm/readahead.c
+++ b/mm/readahead.c
@@ -38,6 +38,7 @@ file_ra_state_init(struct file_ra_state
ra->ra_pages = mapping->backing_dev_info->ra_pages;
ra->prev_page = -1;
}
+EXPORT_SYMBOL_GPL(file_ra_state_init);
/*
* Return max readahead size for this inode in number-of-pages.
-
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