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authorJens Axboe <axboe@suse.de>2006-04-10 09:05:04 +0200
committerJens Axboe <axboe@suse.de>2006-04-10 09:05:04 +0200
commit0b749ce3802428007a37870eb51ba3c0bdf90857 (patch)
tree8e3a2278fab3dae95310570ea54d0dfee1af9fe5
parent49d0b21be21efc07526d637e0ae935019667e532 (diff)
[PATCH] splice: be smarter about calling do_page_cache_readahead()
We don't want to call into the read-ahead logic unless we are at the start of a page, _or_ we have multiple pages to read. Signed-off-by: Jens Axboe <axboe@suse.de>
-rw-r--r--fs/splice.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/fs/splice.c b/fs/splice.c
index 50c43a1e092..9bfd6af0cf4 100644
--- a/fs/splice.c
+++ b/fs/splice.c
@@ -250,9 +250,12 @@ static int __generic_file_splice_read(struct file *in, struct inode *pipe,
nr_pages = PIPE_BUFFERS;
/*
- * initiate read-ahead on this page range
+ * initiate read-ahead on this page range. however, don't call into
+ * read-ahead if this is a non-zero offset (we are likely doing small
+ * chunk splice and the page is already there) for a single page.
*/
- do_page_cache_readahead(mapping, in, index, nr_pages);
+ if (!offset || nr_pages > 1)
+ do_page_cache_readahead(mapping, in, index, nr_pages);
/*
* now fill in the holes