[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>
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1 changed files with 5 additions and 2 deletions
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@ -250,9 +250,12 @@ static int __generic_file_splice_read(struct file *in, struct inode *pipe,
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nr_pages = PIPE_BUFFERS;
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/*
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* initiate read-ahead on this page range
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* initiate read-ahead on this page range. however, don't call into
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* read-ahead if this is a non-zero offset (we are likely doing small
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* chunk splice and the page is already there) for a single page.
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*/
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do_page_cache_readahead(mapping, in, index, nr_pages);
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if (!offset || nr_pages > 1)
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do_page_cache_readahead(mapping, in, index, nr_pages);
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/*
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* now fill in the holes
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