Maxim Patlasov 9abd30b435 fuse: fix fallocate vs. ftruncate race ... commit 0ab08f576b upstream. A former patch introducing FUSE_I_SIZE_UNSTABLE flag provided detailed description of races between ftruncate and anyone who can extend i_size: > 1. As in the previous scenario fuse_dentry_revalidate() discovered that i_size > changed (due to our own fuse_do_setattr()) and is going to call > truncate_pagecache() for some 'new_size' it believes valid right now. But by > the time that particular truncate_pagecache() is called ... > 2. fuse_do_setattr() returns (either having called truncate_pagecache() or > not -- it doesn't matter). > 3. The file is extended either by write(2) or ftruncate(2) or fallocate(2). > 4. mmap-ed write makes a page in the extended region dirty. This patch adds necessary bits to fuse_file_fallocate() to protect from that race. Signed-off-by: Maxim Patlasov <mpatlasov@parallels.com> Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2013-10-13 16:08:32 -07:00
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control.c	fs: Limit sys_mount to only request filesystem modules.	2013-03-03 19:36:31 -08:00
cuse.c	Merge branch 'akpm' (incoming from Andrew)	2013-05-07 20:49:51 -07:00
dev.c	Merge branch 'akpm' (incoming from Andrew)	2013-05-07 20:49:51 -07:00
dir.c	fuse: readdir: check for slash in names	2013-09-26 17:18:30 -07:00
file.c	fuse: fix fallocate vs. ftruncate race	2013-10-13 16:08:32 -07:00
fuse_i.h	fuse: hotfix truncate_pagecache() issue	2013-09-26 17:18:30 -07:00
inode.c	fuse: hotfix truncate_pagecache() issue	2013-09-26 17:18:30 -07:00
Kconfig	fuse: Move CUSE Kconfig entry from fs/Kconfig into fs/fuse/Kconfig	2013-01-17 13:08:45 +01:00
Makefile	CUSE: implement CUSE - Character device in Userspace	2009-06-09 11:24:11 +02:00