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[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>
This commit is contained in:
Jens Axboe 2006-04-10 09:05:04 +02:00
parent 49d0b21be2
commit 0b749ce380
1 changed files with 5 additions and 2 deletions
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7
fs/splice.c
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@ -250,9 +250,12 @@ static int __generic_file_splice_read(struct file *in, struct inode *pipe,
nr_pages = PIPE_BUFFERS; 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 * now fill in the holes