From bfc4ee39fdbb2deb8864785d5e5bc5cdd3b31a69 Mon Sep 17 00:00:00 2001 From: Jens Axboe Date: Wed, 3 May 2006 10:35:10 +0200 Subject: [PATCH] [PATCH] splice: fix unlocking of page on error ->prepare_write() Looking at generic_file_buffered_write(), we need to unlock_page() if prepare write fails and it isn't due to racing with truncate(). Also trim the size if ->prepare_write() fails, if we have to. Signed-off-by: Jens Axboe --- fs/splice.c | 19 ++++++++++++++++--- 1 file changed, 16 insertions(+), 3 deletions(-) diff --git a/fs/splice.c b/fs/splice.c index 7fb04970c72d..27f5e3738a7b 100644 --- a/fs/splice.c +++ b/fs/splice.c @@ -647,11 +647,24 @@ find_page: } ret = mapping->a_ops->prepare_write(file, page, offset, offset+this_len); - if (ret == AOP_TRUNCATED_PAGE) { + if (unlikely(ret)) { + loff_t isize = i_size_read(mapping->host); + + if (ret != AOP_TRUNCATED_PAGE) + unlock_page(page); page_cache_release(page); - goto find_page; - } else if (ret) + if (ret == AOP_TRUNCATED_PAGE) + goto find_page; + + /* + * prepare_write() may have instantiated a few blocks + * outside i_size. Trim these off again. + */ + if (sd->pos + this_len > isize) + vmtruncate(mapping->host, isize); + goto out; + } if (buf->page != page) { /* -- 2.20.1