From: Miklos Szeredi Date: Thu, 18 Oct 2007 10:06:58 +0000 (-0700) Subject: fuse: fix race between getattr and write X-Git-Tag: v2.6.24-rc1~320 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1fb69e7817296da8a6824804bb206ca1e7f31425;p=pandora-kernel.git fuse: fix race between getattr and write Getattr and lookup operations can be running in parallel to attribute changing operations, such as write and setattr. This means, that if for example getattr was slower than a write, the cached size attribute could be set to a stale value. To prevent this race, introduce a per-filesystem attribute version counter. This counter is incremented whenever cached attributes are modified, and the incremented value stored in the inode. Before storing new attributes in the cache, getattr and lookup check, using the version number, whether the attributes have been modified during the request's lifetime. If so, the returned attributes are not cached, because they might be stale. Thanks to Jakub Bogusz for the bug report and test program. [akpm@linux-foundation.org: coding-style fixes] Signed-off-by: Miklos Szeredi Cc: Jakub Bogusz Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- Reading git-diff-tree failed