This is a note to let you know that I've just added the patch titled fuse: postpone end_page_writeback() in fuse_writepage_locked() to the 3.11-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: fuse-postpone-end_page_writeback-in-fuse_writepage_locked.patch and it can be found in the queue-3.11 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 4a4ac4eba1010ef9a804569058ab29e3450c0315 Mon Sep 17 00:00:00 2001 From: Maxim Patlasov <MPatlasov@xxxxxxxxxxxxx> Date: Mon, 12 Aug 2013 20:39:30 +0400 Subject: fuse: postpone end_page_writeback() in fuse_writepage_locked() From: Maxim Patlasov <MPatlasov@xxxxxxxxxxxxx> commit 4a4ac4eba1010ef9a804569058ab29e3450c0315 upstream. The patch fixes a race between ftruncate(2), mmap-ed write and write(2): 1) An user makes a page dirty via mmap-ed write. 2) The user performs shrinking truncate(2) intended to purge the page. 3) Before fuse_do_setattr calls truncate_pagecache, the page goes to writeback. fuse_writepage_locked fills FUSE_WRITE request and releases the original page by end_page_writeback. 4) fuse_do_setattr() completes and successfully returns. Since now, i_mutex is free. 5) Ordinary write(2) extends i_size back to cover the page. Note that fuse_send_write_pages do wait for fuse writeback, but for another page->index. 6) fuse_writepage_locked proceeds by queueing FUSE_WRITE request. fuse_send_writepage is supposed to crop inarg->size of the request, but it doesn't because i_size has already been extended back. Moving end_page_writeback to the end of fuse_writepage_locked fixes the race because now the fact that truncate_pagecache is successfully returned infers that fuse_writepage_locked has already called end_page_writeback. And this, in turn, infers that fuse_flush_writepages has already called fuse_send_writepage, and the latter used valid (shrunk) i_size. write(2) could not extend it because of i_mutex held by ftruncate(2). Signed-off-by: Maxim Patlasov <mpatlasov@xxxxxxxxxxxxx> Signed-off-by: Miklos Szeredi <mszeredi@xxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- fs/fuse/file.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- a/fs/fuse/file.c +++ b/fs/fuse/file.c @@ -1529,7 +1529,6 @@ static int fuse_writepage_locked(struct inc_bdi_stat(mapping->backing_dev_info, BDI_WRITEBACK); inc_zone_page_state(tmp_page, NR_WRITEBACK_TEMP); - end_page_writeback(page); spin_lock(&fc->lock); list_add(&req->writepages_entry, &fi->writepages); @@ -1537,6 +1536,8 @@ static int fuse_writepage_locked(struct fuse_flush_writepages(inode); spin_unlock(&fc->lock); + end_page_writeback(page); + return 0; err_free: Patches currently in stable-queue which might be from MPatlasov@xxxxxxxxxxxxx are queue-3.11/fuse-postpone-end_page_writeback-in-fuse_writepage_locked.patch queue-3.11/fuse-hotfix-truncate_pagecache-issue.patch -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html