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fs: cleanup files_lock locking

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fs: cleanup files_lock locking

Lock tty_files with a new spinlock, tty_files_lock; provide helpers to
manipulate the per-sb files list; unexport the files_lock spinlock.

Cc: linux-kernel@vger.kernel.org
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Acked-by: Andi Kleen <ak@linux.intel.com>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Nick Piggin <npiggin@kernel.dk>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Nick Piggin
2010-08-18 04:37:35 +10:00
committed by Al Viro
parent b04f784e5d
commit ee2ffa0dfd
7 changed files with 48 additions and 42 deletions
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security/selinux/hooks.c
+2 -2
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@@ -2170,7 +2170,7 @@ static inline void flush_unauthorized_files(const struct cred *cred,
tty = get_current_tty();
if (tty) {
file_list_lock();
spin_lock(&tty_files_lock);
if (!list_empty(&tty->tty_files)) {
struct inode *inode;
@@ -2186,7 +2186,7 @@ static inline void flush_unauthorized_files(const struct cred *cred,
drop_tty = 1;
}
}
file_list_unlock();
spin_unlock(&tty_files_lock);
tty_kref_put(tty);
}
/* Reset controlling tty. */