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authorLinus Torvalds <torvalds@linux-foundation.org>2011-02-16 08:56:55 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2011-02-16 08:56:55 -0800
commit3abb17e82f08628b59e20d8cbcb55e2204180f69 (patch)
tree890a411ebda28a9b9e6c90520429554a9e7fb95a /Documentation/filesystems
parent85e2efbb1db9a18d218006706d6e4fbeb0216213 (diff)
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vfs: fix BUG_ON() in fs/namei.c:1461
When Al moved the nameidata_dentry_drop_rcu_maybe() call into the do_follow_link function in commit 844a391799c2 ("nothing in do_follow_link() is going to see RCU"), he mistakenly left the BUG_ON(inode != path->dentry->d_inode); behind. Which would otherwise be ok, but that BUG_ON() really needs to be _after_ dropping RCU, since the dentry isn't necessarily stable otherwise. So complete the code movement in that commit, and move the BUG_ON() into do_follow_link() too. This means that we need to pass in 'inode' as an argument (just for this one use), but that's a small thing. And eventually we may be confident enough in our path lookup that we can just remove the BUG_ON() and the unnecessary inode argument. Reported-and-tested-by: Eric Dumazet <eric.dumazet@gmail.com> Acked-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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