[PATCH v2] m: readahead: return the value which force_page_cache_readahead() returns

[Chen Gang <gang.chen@asianux.com>]

force_page_cache_readahead() may fail, so need let the related upper
system calls know about it by its return value.

For system call fadvise64_64(), ignore return value because fadvise()
shall return success even if filesystem can't retrieve a hint.

Signed-off-by: Chen Gang <gang.chen@asianux.com>
---
 mm/madvise.c   |    4 ++--
 mm/readahead.c |    3 +--
 2 files changed, 3 insertions(+), 4 deletions(-)

diff --git a/mm/madvise.c b/mm/madvise.c
index 936799f..3d0d484 100644
--- a/mm/madvise.c
+++ b/mm/madvise.c
@@ -247,8 +247,8 @@ static long madvise_willneed(struct vm_area_struct *vma,
 		end = vma->vm_end;
 	end = ((end - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
 
-	force_page_cache_readahead(file->f_mapping, file, start, end - start);
-	return 0;
+	return force_page_cache_readahead(file->f_mapping, file,
+					start, end - start);
 }
 
 /*
diff --git a/mm/readahead.c b/mm/readahead.c
index e4ed041..1b21b5c 100644
--- a/mm/readahead.c
+++ b/mm/readahead.c
@@ -572,8 +572,7 @@ do_readahead(struct address_space *mapping, struct file *filp,
 	if (!mapping || !mapping->a_ops || !mapping->a_ops->readpage)
 		return -EINVAL;
 
-	force_page_cache_readahead(mapping, filp, index, nr);
-	return 0;
+	return force_page_cache_readahead(mapping, filp, index, nr);
 }
 
 SYSCALL_DEFINE3(readahead, int, fd, loff_t, offset, size_t, count)
-- 
1.7.7.6

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