The patch titled
Subject: mm: adjust max read count in generic_file_buffered_read()
has been added to the -mm tree. Its filename is
mm-adjust-max-read-count-in-generic_file_buffered_read.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-adjust-max-read-count-in-generic_file_buffered_read.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-adjust-max-read-count-in-generic_file_buffered_read.patch
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------------------------------------------------------
From: Chengguang Xu <cgxu519@xxxxxxx>
Subject: mm: adjust max read count in generic_file_buffered_read()
When we try to truncate read count in generic_file_buffered_read(), should
deliver (sb->s_maxbytes - offset) as maximum count not sb->s_maxbytes
itself.
Link: http://lkml.kernel.org/r/20180719081726.3341-1-cgxu519@xxxxxxx
Signed-off-by: Chengguang Xu <cgxu519@xxxxxxx>
Reviewed-by: Jan Kara <jack@xxxxxxx>
Reviewed-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Cc: Jeff Layton <jlayton@xxxxxxxxxx>
Cc: Andi Kleen <ak@xxxxxxxxxxxxxxx>
Cc: Matthew Wilcox <mawilcox@xxxxxxxxxxxxx>
Cc: Tim Chen <tim.c.chen@xxxxxxxxxxxxxxx>
Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/filemap.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff -puN mm/filemap.c~mm-adjust-max-read-count-in-generic_file_buffered_read mm/filemap.c
--- a/mm/filemap.c~mm-adjust-max-read-count-in-generic_file_buffered_read
+++ a/mm/filemap.c
@@ -2064,7 +2064,7 @@ static ssize_t generic_file_buffered_rea
if (unlikely(*ppos >= inode->i_sb->s_maxbytes))
return 0;
- iov_iter_truncate(iter, inode->i_sb->s_maxbytes);
+ iov_iter_truncate(iter, inode->i_sb->s_maxbytes - *ppos);
index = *ppos >> PAGE_SHIFT;
prev_index = ra->prev_pos >> PAGE_SHIFT;
_
Patches currently in -mm which might be from cgxu519@xxxxxxx are
mm-adjust-max-read-count-in-generic_file_buffered_read.patch
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