From a0548871ed267ae12eb1c860c5aaebd9e466b34e Mon Sep 17 00:00:00 2001
From: Jens Axboe <axboe@suse.de>
Date: Wed, 3 May 2006 10:58:22 +0200
Subject: [PATCH] splice: redo page lookup if add_to_page_cache() returns
-EEXIST
This can happen quite easily, if several processes are trying to splice
the same file at the same time. It's not a failure, it just means someone
raced with us in allocating this file page. So just dump the allocated
page and relookup the original.
Signed-off-by: Jens Axboe <axboe@suse.de>
---
fs/splice.c | 2 ++
1 file changed, 2 insertions(+)
(limited to 'fs')
diff --git a/fs/splice.c b/fs/splice.c
index 8fa9217ed5..a285fd746d 100644
--- a/fs/splice.c
+++ b/fs/splice.c
@@ -324,6 +324,8 @@ __generic_file_splice_read(struct file *in, loff_t *ppos,
mapping_gfp_mask(mapping));
if (unlikely(error)) {
page_cache_release(page);
+ if (error == -EEXIST)
+ continue;
break;
}
/*
--
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