From 6c231b7bab0aa6860cd9da2de8a064eddc34c146 Mon Sep 17 00:00:00 2001 From: Ravikiran G Thirumalai Date: Tue, 6 Sep 2005 15:17:45 -0700 Subject: [PATCH] Additions to .data.read_mostly section Mark variables which are usually accessed for reads with __readmostly. Signed-off-by: Alok N Kataria Signed-off-by: Shai Fultheim Signed-off-by: Ravikiran Thirumalai Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- fs/namespace.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'fs/namespace.c') diff --git a/fs/namespace.c b/fs/namespace.c index 79bd8a46e1e..29b70669435 100644 --- a/fs/namespace.c +++ b/fs/namespace.c @@ -40,7 +40,7 @@ static inline int sysfs_init(void) __cacheline_aligned_in_smp DEFINE_SPINLOCK(vfsmount_lock); static struct list_head *mount_hashtable; -static int hash_mask, hash_bits; +static int hash_mask __read_mostly, hash_bits __read_mostly; static kmem_cache_t *mnt_cache; static inline unsigned long hash(struct vfsmount *mnt, struct dentry *dentry) -- cgit v1.2.3-70-g09d2 From 0bb6fcc13ae4fad98e0d610458975e47be0d2203 Mon Sep 17 00:00:00 2001 From: Miklos Szeredi Date: Tue, 6 Sep 2005 15:19:36 -0700 Subject: [PATCH] pivot_root() circular reference fix Fix http://bugzilla.kernel.org/show_bug.cgi?id=4857 When pivot_root is called from an init script in an initramfs environment, it causes a circular reference in the mount tree. The cause of this is that pivot_root() is not prepared to handle pivoting an unattached mount. In an initramfs environment, rootfs is the root of the namespace, and so it is not attached. This patch fixes this and related problems, by returning -EINVAL if either the current root or the new root is detached. Signed-off-by: Miklos Szeredi Acked-by: Al Viro Cc: Cc: Christoph Hellwig Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- fs/namespace.c | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'fs/namespace.c') diff --git a/fs/namespace.c b/fs/namespace.c index 29b70669435..34156260c9b 100644 --- a/fs/namespace.c +++ b/fs/namespace.c @@ -1334,8 +1334,12 @@ asmlinkage long sys_pivot_root(const char __user *new_root, const char __user *p error = -EINVAL; if (user_nd.mnt->mnt_root != user_nd.dentry) goto out2; /* not a mountpoint */ + if (user_nd.mnt->mnt_parent == user_nd.mnt) + goto out2; /* not attached */ if (new_nd.mnt->mnt_root != new_nd.dentry) goto out2; /* not a mountpoint */ + if (new_nd.mnt->mnt_parent == new_nd.mnt) + goto out2; /* not attached */ tmp = old_nd.mnt; /* make sure we can reach put_old from new_root */ spin_lock(&vfsmount_lock); if (tmp != new_nd.mnt) { -- cgit v1.2.3-70-g09d2