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splice: handle try_to_release_page() failure 

splice currently assumes that try_to_release_page() always suceeds,
but it can return failure. If it does, we cannot steal the page.

Acked-by: Mingming Cao <cmm@us.ibm.com
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Jens Axboe 2008-05-20 21:27:41 +02:00
parent a82c53a0e3
commit ca39d651d1
1 changed files with 3 additions and 2 deletions
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5
fs/splice.c
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@ -58,8 +58,8 @@ static int page_cache_pipe_buf_steal(struct pipe_inode_info *pipe,
*/ */
wait_on_page_writeback(page); wait_on_page_writeback(page);
if (PagePrivate(page)) if (PagePrivate(page) && !try_to_release_page(page, GFP_KERNEL))
try_to_release_page(page, GFP_KERNEL); goto out_unlock;
/* /*
* If we succeeded in removing the mapping, set LRU flag * If we succeeded in removing the mapping, set LRU flag
@ -75,6 +75,7 @@ static int page_cache_pipe_buf_steal(struct pipe_inode_info *pipe,
* Raced with truncate or failed to remove page from current * Raced with truncate or failed to remove page from current
* address space, unlock and return failure. * address space, unlock and return failure.
*/ */
out_unlock:
unlock_page(page); unlock_page(page);
return 1; return 1;
} }