leds: Add support for hardware accelerated LED flashing

[linux-2.6-omap-h63xx.git] / fs / namespace.c

diff --git a/fs/namespace.c b/fs/namespace.c
index ddbda13c2d317dc79bb6bffa41e688a250dd1ccf..e9c10cd01e1325cff95869cbb0f23aa8d14c10ce 100644 (file)
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -25,31 +25,34 @@
 #include <linux/security.h>
 #include <linux/mount.h>
 #include <linux/ramfs.h>
+#include <linux/log2.h>
 #include <asm/uaccess.h>
 #include <asm/unistd.h>
 #include "pnode.h"
 #include "internal.h"
 
+#define HASH_SHIFT ilog2(PAGE_SIZE / sizeof(struct list_head))
+#define HASH_SIZE (1UL << HASH_SHIFT)
+
 /* spinlock for vfsmount related operations, inplace of dcache_lock */
 __cacheline_aligned_in_smp DEFINE_SPINLOCK(vfsmount_lock);
 
 static int event;
 
 static struct list_head *mount_hashtable __read_mostly;
-static int hash_mask __read_mostly, hash_bits __read_mostly;
 static struct kmem_cache *mnt_cache __read_mostly;
 static struct rw_semaphore namespace_sem;
 
 /* /sys/fs */
-decl_subsys(fs, NULL, NULL);
-EXPORT_SYMBOL_GPL(fs_subsys);
+struct kobject *fs_kobj;
+EXPORT_SYMBOL_GPL(fs_kobj);
 
 static inline unsigned long hash(struct vfsmount *mnt, struct dentry *dentry)
 {
        unsigned long tmp = ((unsigned long)mnt / L1_CACHE_BYTES);
        tmp += ((unsigned long)dentry / L1_CACHE_BYTES);
-       tmp = tmp + (tmp >> hash_bits);
-       return tmp & hash_mask;
+       tmp = tmp + (tmp >> HASH_SHIFT);
+       return tmp & (HASH_SIZE - 1);
 }
 
 struct vfsmount *alloc_vfsmnt(const char *name)
@@ -246,7 +249,7 @@ static struct vfsmount *clone_mnt(struct vfsmount *old, struct dentry *root,
                        list_add(&mnt->mnt_slave, &old->mnt_slave_list);
                        mnt->mnt_master = old;
                        CLEAR_MNT_SHARED(mnt);
-               } else {
+               } else if (!(flag & CL_PRIVATE)) {
                        if ((flag & CL_PROPAGATION) || IS_MNT_SHARED(old))
                                list_add(&mnt->mnt_share, &old->mnt_share);
                        if (IS_MNT_SLAVE(old))
@@ -746,6 +749,26 @@ Enomem:
        return NULL;
 }
 
+struct vfsmount *collect_mounts(struct vfsmount *mnt, struct dentry *dentry)
+{
+       struct vfsmount *tree;
+       down_read(&namespace_sem);
+       tree = copy_tree(mnt, dentry, CL_COPY_ALL | CL_PRIVATE);
+       up_read(&namespace_sem);
+       return tree;
+}
+
+void drop_collected_mounts(struct vfsmount *mnt)
+{
+       LIST_HEAD(umount_list);
+       down_read(&namespace_sem);
+       spin_lock(&vfsmount_lock);
+       umount_tree(mnt, 0, &umount_list);
+       spin_unlock(&vfsmount_lock);
+       up_read(&namespace_sem);
+       release_mounts(&umount_list);
+}
+
 /*
  *  @source_mnt : mount tree to be attached
  *  @nd         : place the mount tree @source_mnt is attached
@@ -1411,7 +1434,7 @@ long do_mount(char *dev_name, char *dir_name, char *type_page,
                mnt_flags |= MNT_RELATIME;
 
        flags &= ~(MS_NOSUID | MS_NOEXEC | MS_NODEV | MS_ACTIVE |
-                  MS_NOATIME | MS_NODIRATIME | MS_RELATIME);
+                  MS_NOATIME | MS_NODIRATIME | MS_RELATIME| MS_KERNMOUNT);
 
        /* ... and get the mountpoint */
        retval = path_lookup(dir_name, LOOKUP_FOLLOW, &nd);
@@ -1791,11 +1814,9 @@ static void __init init_mount_tree(void)
        set_fs_root(current->fs, ns->root, ns->root->mnt_root);
 }
 
-void __init mnt_init(unsigned long mempages)
+void __init mnt_init(void)
 {
-       struct list_head *d;
-       unsigned int nr_hash;
-       int i;
+       unsigned u;
        int err;
 
        init_rwsem(&namespace_sem);
@@ -1808,43 +1829,18 @@ void __init mnt_init(unsigned long mempages)
        if (!mount_hashtable)
                panic("Failed to allocate mount hash table\n");
 
-       /*
-        * Find the power-of-two list-heads that can fit into the allocation..
-        * We don't guarantee that "sizeof(struct list_head)" is necessarily
-        * a power-of-two.
-        */
-       nr_hash = PAGE_SIZE / sizeof(struct list_head);
-       hash_bits = 0;
-       do {
-               hash_bits++;
-       } while ((nr_hash >> hash_bits) != 0);
-       hash_bits--;
+       printk("Mount-cache hash table entries: %lu\n", HASH_SIZE);
+
+       for (u = 0; u < HASH_SIZE; u++)
+               INIT_LIST_HEAD(&mount_hashtable[u]);
 
-       /*
-        * Re-calculate the actual number of entries and the mask
-        * from the number of bits we can fit.
-        */
-       nr_hash = 1UL << hash_bits;
-       hash_mask = nr_hash - 1;
-
-       printk("Mount-cache hash table entries: %d\n", nr_hash);
-
-       /* And initialize the newly allocated array */
-       d = mount_hashtable;
-       i = nr_hash;
-       do {
-               INIT_LIST_HEAD(d);
-               d++;
-               i--;
-       } while (i);
        err = sysfs_init();
        if (err)
                printk(KERN_WARNING "%s: sysfs_init error: %d\n",
                        __FUNCTION__, err);
-       err = subsystem_register(&fs_subsys);
-       if (err)
-               printk(KERN_WARNING "%s: subsystem_register error: %d\n",
-                       __FUNCTION__, err);
+       fs_kobj = kobject_create_and_add("fs", NULL);
+       if (!fs_kobj)
+               printk(KERN_WARNING "%s: kobj create error\n", __FUNCTION__);
        init_rootfs();
        init_mount_tree();
 }