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authorMaxim Patlasov <MPatlasov@parallels.com>2013-08-12 20:39:30 +0400
committerMiklos Szeredi <mszeredi@suse.cz>2013-09-03 13:41:57 +0200
commit4a4ac4eba1010ef9a804569058ab29e3450c0315 (patch)
tree39554a6923802921ee0526114f0d7d738ca0a858 /fs/fuse/control.c
parent6e4664525b1db28f8c4e1130957f70a94c19213e (diff)
downloadop-kernel-dev-4a4ac4eba1010ef9a804569058ab29e3450c0315.zip
op-kernel-dev-4a4ac4eba1010ef9a804569058ab29e3450c0315.tar.gz
fuse: postpone end_page_writeback() in fuse_writepage_locked()
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@parallels.com> Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Cc: stable@vger.kernel.org
Diffstat (limited to 'fs/fuse/control.c')
0 files changed, 0 insertions, 0 deletions
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