Merge tag 'v2.6.38' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6

[mv-sheeva.git] / fs / libfs.c

diff --git a/fs/libfs.c b/fs/libfs.c
index a3accdf528add9161bd6dccfb84f7c08ccb28437..c88eab55aec95f4ab26427da882fd88c8b3ef512 100644 (file)
--- a/fs/libfs.c
+++ b/fs/libfs.c
@@ -16,6 +16,11 @@
 
 #include <asm/uaccess.h>
 
+static inline int simple_positive(struct dentry *dentry)
+{
+       return dentry->d_inode && !d_unhashed(dentry);
+}
+
 int simple_getattr(struct vfsmount *mnt, struct dentry *dentry,
                   struct kstat *stat)
 {
@@ -37,7 +42,7 @@ int simple_statfs(struct dentry *dentry, struct kstatfs *buf)
  * Retaining negative dentries for an in-memory filesystem just wastes
  * memory and lookup time: arrange for them to be deleted immediately.
  */
-static int simple_delete_dentry(struct dentry *dentry)
+static int simple_delete_dentry(const struct dentry *dentry)
 {
        return 1;
 }
@@ -54,7 +59,7 @@ struct dentry *simple_lookup(struct inode *dir, struct dentry *dentry, struct na
 
        if (dentry->d_name.len > NAME_MAX)
                return ERR_PTR(-ENAMETOOLONG);
-       dentry->d_op = &simple_dentry_operations;
+       d_set_d_op(dentry, &simple_dentry_operations);
        d_add(dentry, NULL);
        return NULL;
 }
@@ -76,7 +81,8 @@ int dcache_dir_close(struct inode *inode, struct file *file)
 
 loff_t dcache_dir_lseek(struct file *file, loff_t offset, int origin)
 {
-       mutex_lock(&file->f_path.dentry->d_inode->i_mutex);
+       struct dentry *dentry = file->f_path.dentry;
+       mutex_lock(&dentry->d_inode->i_mutex);
        switch (origin) {
                case 1:
                        offset += file->f_pos;
@@ -84,7 +90,7 @@ loff_t dcache_dir_lseek(struct file *file, loff_t offset, int origin)
                        if (offset >= 0)
                                break;
                default:
-                       mutex_unlock(&file->f_path.dentry->d_inode->i_mutex);
+                       mutex_unlock(&dentry->d_inode->i_mutex);
                        return -EINVAL;
        }
        if (offset != file->f_pos) {
@@ -94,21 +100,24 @@ loff_t dcache_dir_lseek(struct file *file, loff_t offset, int origin)
                        struct dentry *cursor = file->private_data;
                        loff_t n = file->f_pos - 2;
 
-                       spin_lock(&dcache_lock);
+                       spin_lock(&dentry->d_lock);
+                       /* d_lock not required for cursor */
                        list_del(&cursor->d_u.d_child);
-                       p = file->f_path.dentry->d_subdirs.next;
-                       while (n && p != &file->f_path.dentry->d_subdirs) {
+                       p = dentry->d_subdirs.next;
+                       while (n && p != &dentry->d_subdirs) {
                                struct dentry *next;
                                next = list_entry(p, struct dentry, d_u.d_child);
-                               if (!d_unhashed(next) && next->d_inode)
+                               spin_lock_nested(&next->d_lock, DENTRY_D_LOCK_NESTED);
+                               if (simple_positive(next))
                                        n--;
+                               spin_unlock(&next->d_lock);
                                p = p->next;
                        }
                        list_add_tail(&cursor->d_u.d_child, p);
-                       spin_unlock(&dcache_lock);
+                       spin_unlock(&dentry->d_lock);
                }
        }
-       mutex_unlock(&file->f_path.dentry->d_inode->i_mutex);
+       mutex_unlock(&dentry->d_inode->i_mutex);
        return offset;
 }
 
@@ -148,29 +157,35 @@ int dcache_readdir(struct file * filp, void * dirent, filldir_t filldir)
                        i++;
                        /* fallthrough */
                default:
-                       spin_lock(&dcache_lock);
+                       spin_lock(&dentry->d_lock);
                        if (filp->f_pos == 2)
                                list_move(q, &dentry->d_subdirs);
 
                        for (p=q->next; p != &dentry->d_subdirs; p=p->next) {
                                struct dentry *next;
                                next = list_entry(p, struct dentry, d_u.d_child);
-                               if (d_unhashed(next) || !next->d_inode)
+                               spin_lock_nested(&next->d_lock, DENTRY_D_LOCK_NESTED);
+                               if (!simple_positive(next)) {
+                                       spin_unlock(&next->d_lock);
                                        continue;
+                               }
 
-                               spin_unlock(&dcache_lock);
+                               spin_unlock(&next->d_lock);
+                               spin_unlock(&dentry->d_lock);
                                if (filldir(dirent, next->d_name.name, 
                                            next->d_name.len, filp->f_pos, 
                                            next->d_inode->i_ino, 
                                            dt_type(next->d_inode)) < 0)
                                        return 0;
-                               spin_lock(&dcache_lock);
+                               spin_lock(&dentry->d_lock);
+                               spin_lock_nested(&next->d_lock, DENTRY_D_LOCK_NESTED);
                                /* next is still alive */
                                list_move(q, p);
+                               spin_unlock(&next->d_lock);
                                p = q;
                                filp->f_pos++;
                        }
-                       spin_unlock(&dcache_lock);
+                       spin_unlock(&dentry->d_lock);
        }
        return 0;
 }
@@ -202,7 +217,8 @@ static const struct super_operations simple_super_operations = {
  * will never be mountable)
  */
 struct dentry *mount_pseudo(struct file_system_type *fs_type, char *name,
-       const struct super_operations *ops, unsigned long magic)
+       const struct super_operations *ops,
+       const struct dentry_operations *dops, unsigned long magic)
 {
        struct super_block *s = sget(fs_type, NULL, set_anon_super, NULL);
        struct dentry *dentry;
@@ -239,6 +255,7 @@ struct dentry *mount_pseudo(struct file_system_type *fs_type, char *name,
        dentry->d_parent = dentry;
        d_instantiate(dentry, root);
        s->s_root = dentry;
+       s->s_d_op = dops;
        s->s_flags |= MS_ACTIVE;
        return dget(s->s_root);
 
@@ -259,23 +276,23 @@ int simple_link(struct dentry *old_dentry, struct inode *dir, struct dentry *den
        return 0;
 }
 
-static inline int simple_positive(struct dentry *dentry)
-{
-       return dentry->d_inode && !d_unhashed(dentry);
-}
-
 int simple_empty(struct dentry *dentry)
 {
        struct dentry *child;
        int ret = 0;
 
-       spin_lock(&dcache_lock);
-       list_for_each_entry(child, &dentry->d_subdirs, d_u.d_child)
-               if (simple_positive(child))
+       spin_lock(&dentry->d_lock);
+       list_for_each_entry(child, &dentry->d_subdirs, d_u.d_child) {
+               spin_lock_nested(&child->d_lock, DENTRY_D_LOCK_NESTED);
+               if (simple_positive(child)) {
+                       spin_unlock(&child->d_lock);
                        goto out;
+               }
+               spin_unlock(&child->d_lock);
+       }
        ret = 1;
 out:
-       spin_unlock(&dcache_lock);
+       spin_unlock(&dentry->d_lock);
        return ret;
 }