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[PATCH] files: lock-free fd look-up

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With the use of RCU in files structure, the look-up of files using fds can now
be lock-free.  The lookup is protected by rcu_read_lock()/rcu_read_unlock().
This patch changes the readers to use lock-free lookup.

Signed-off-by: Maneesh Soni <maneesh@in.ibm.com>
Signed-off-by: Ravikiran Thirumalai <kiran_th@gmail.com>
Signed-off-by: Dipankar Sarma <dipankar@in.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Dipankar Sarma
2005-09-09 13:04:14 -07:00
committed by Linus Torvalds
parent ab2af1f500
commit b835996f62
9 changed files with 39 additions and 27 deletions
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2
security/selinux/hooks.c
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@@ -1652,7 +1652,7 @@ static inline void flush_unauthorized_files(struct files_struct * files)
continue;
}
if (devnull) {
atomic_inc(&devnull->f_count);
rcuref_inc(&devnull->f_count);
} else {
devnull = dentry_open(dget(selinux_null), mntget(selinuxfs_mount), O_RDWR);
if (!devnull) {