21 files changed, 203 insertions, 268 deletions

diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
index 798e468103b8..61f441409234 100644
--- a/drivers/md/dm-table.c
+++ b/drivers/md/dm-table.c
@@ -316,29 +316,12 @@ static inline int check_space(struct dm_table *t)
  */
 static int lookup_device(const char *path, dev_t *dev)
 {
-        int r;
-        struct nameidata nd;
-        struct inode *inode;
-
-        if ((r = path_lookup(path, LOOKUP_FOLLOW, &nd)))
-                return r;
-
-        inode = nd.path.dentry->d_inode;
-        if (!inode) {
-                r = -ENOENT;
-                goto out;
-        }
-
-        if (!S_ISBLK(inode->i_mode)) {
-                r = -ENOTBLK;
-                goto out;
-        }
-
-        *dev = inode->i_rdev;
-
- out:
-        path_put(&nd.path);
-        return r;
+        struct block_device *bdev = lookup_bdev(path);
+        if (IS_ERR(bdev))
+                return PTR_ERR(bdev);
+        *dev = bdev->bd_dev;
+        bdput(bdev);
+        return 0;
 }
 
 /*
diff --git a/drivers/mtd/mtdsuper.c b/drivers/mtd/mtdsuper.c
index 28cc6787a800..9b6af7e74a65 100644
--- a/drivers/mtd/mtdsuper.c
+++ b/drivers/mtd/mtdsuper.c
@@ -125,7 +125,7 @@ int get_sb_mtd(struct file_system_type *fs_type, int flags,
                int (*fill_super)(struct super_block *, void *, int),
                struct vfsmount *mnt)
 {
-        struct nameidata nd;
+        struct block_device *bdev;
         int mtdnr, ret;
 
         if (!dev_name)
@@ -181,29 +181,20 @@ int get_sb_mtd(struct file_system_type *fs_type, int flags,
         /* try the old way - the hack where we allowed users to mount
          * /dev/mtdblock$(n) but didn't actually _use_ the blockdev
          */
-        ret = path_lookup(dev_name, LOOKUP_FOLLOW, &nd);
-
-        DEBUG(1, "MTDSB: path_lookup() returned %d, inode %p\n",
-              ret, nd.path.dentry ? nd.path.dentry->d_inode : NULL);
-
-        if (ret)
+        bdev = lookup_bdev(dev_name);
+        if (IS_ERR(bdev)) {
+                ret = PTR_ERR(bdev);
+                DEBUG(1, "MTDSB: lookup_bdev() returned %d\n", ret);
                 return ret;
-
-        ret = -EINVAL;
-
-        if (!S_ISBLK(nd.path.dentry->d_inode->i_mode))
-                goto out;
-
-        if (nd.path.mnt->mnt_flags & MNT_NODEV) {
-                ret = -EACCES;
-                goto out;
         }
+        DEBUG(1, "MTDSB: lookup_bdev() returned 0\n");
 
-        if (imajor(nd.path.dentry->d_inode) != MTD_BLOCK_MAJOR)
+        ret = -EINVAL;
+        if (MAJOR(bdev->bd_dev) != MTD_BLOCK_MAJOR)
                 goto not_an_MTD_device;
 
-        mtdnr = iminor(nd.path.dentry->d_inode);
-        path_put(&nd.path);
+        mtdnr = MINOR(bdev->bd_dev);
+        bdput(bdev);
 
         return get_sb_mtd_nr(fs_type, flags, dev_name, data, mtdnr, fill_super,
                              mnt);
@@ -213,10 +204,8 @@ not_an_MTD_device:
                 printk(KERN_NOTICE
                        "MTD: Attempt to mount non-MTD device \"%s\"\n",
                        dev_name);
-out:
-        path_put(&nd.path);
+        bdput(bdev);
         return ret;
-
 }
 
 EXPORT_SYMBOL_GPL(get_sb_mtd);
diff --git a/fs/afs/mntpt.c b/fs/afs/mntpt.c
index 2f5503902c37..78db4953a800 100644
--- a/fs/afs/mntpt.c
+++ b/fs/afs/mntpt.c
@@ -232,7 +232,7 @@ static void *afs_mntpt_follow_link(struct dentry *dentry, struct nameidata *nd)
         }
 
         mntget(newmnt);
-        err = do_add_mount(newmnt, nd, MNT_SHRINKABLE, &afs_vfsmounts);
+        err = do_add_mount(newmnt, &nd->path, MNT_SHRINKABLE, &afs_vfsmounts);
         switch (err) {
         case 0:
                 path_put(&nd->path);
diff --git a/fs/block_dev.c b/fs/block_dev.c
index dcf37cada369..aff54219e049 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -941,8 +941,10 @@ static int do_open(struct block_device *bdev, struct file *file, int for_part)
          * hooks: /n/, see "layering violations".
          */
         ret = devcgroup_inode_permission(bdev->bd_inode, perm);
-        if (ret != 0)
+        if (ret != 0) {
+                bdput(bdev);
                 return ret;
+        }
 
         ret = -ENXIO;
         file->f_mapping = bdev->bd_inode->i_mapping;
@@ -1234,6 +1236,7 @@ fail:
         bdev = ERR_PTR(error);
         goto out;
 }
+EXPORT_SYMBOL(lookup_bdev);
 
 /**
  * open_bdev_excl  -  open a block device by name and set it up for use
diff --git a/fs/cifs/cifs_dfs_ref.c b/fs/cifs/cifs_dfs_ref.c
index d82374c9e329..d2c8eef84f3c 100644
--- a/fs/cifs/cifs_dfs_ref.c
+++ b/fs/cifs/cifs_dfs_ref.c
@@ -226,7 +226,7 @@ static int add_mount_helper(struct vfsmount *newmnt, struct nameidata *nd,
         int err;
 
         mntget(newmnt);
-        err = do_add_mount(newmnt, nd, nd->path.mnt->mnt_flags, mntlist);
+        err = do_add_mount(newmnt, &nd->path, nd->path.mnt->mnt_flags, mntlist);
         switch (err) {
         case 0:
                 path_put(&nd->path);
diff --git a/fs/devpts/inode.c b/fs/devpts/inode.c
index 285b64a8b06e..488eb424f662 100644
--- a/fs/devpts/inode.c
+++ b/fs/devpts/inode.c
@@ -29,7 +29,7 @@
 #define DEVPTS_DEFAULT_MODE 0600
 
 extern int pty_limit;                   /* Config limit on Unix98 ptys */
-static DEFINE_IDR(allocated_ptys);
+static DEFINE_IDA(allocated_ptys);
 static DEFINE_MUTEX(allocated_ptys_lock);
 
 static struct vfsmount *devpts_mnt;
@@ -180,24 +180,24 @@ static struct dentry *get_node(int num)
 int devpts_new_index(void)
 {
         int index;
-        int idr_ret;
+        int ida_ret;
 
 retry:
-        if (!idr_pre_get(&allocated_ptys, GFP_KERNEL)) {
+        if (!ida_pre_get(&allocated_ptys, GFP_KERNEL)) {
                 return -ENOMEM;
         }
 
         mutex_lock(&allocated_ptys_lock);
-        idr_ret = idr_get_new(&allocated_ptys, NULL, &index);
-        if (idr_ret < 0) {
+        ida_ret = ida_get_new(&allocated_ptys, &index);
+        if (ida_ret < 0) {
                 mutex_unlock(&allocated_ptys_lock);
-                if (idr_ret == -EAGAIN)
+                if (ida_ret == -EAGAIN)
                         goto retry;
                 return -EIO;
         }
 
         if (index >= pty_limit) {
-                idr_remove(&allocated_ptys, index);
+                ida_remove(&allocated_ptys, index);
                 mutex_unlock(&allocated_ptys_lock);
                 return -EIO;
         }
@@ -208,7 +208,7 @@ retry:
 void devpts_kill_index(int idx)
 {
         mutex_lock(&allocated_ptys_lock);
-        idr_remove(&allocated_ptys, idx);
+        ida_remove(&allocated_ptys, idx);
         mutex_unlock(&allocated_ptys_lock);
 }
 
diff --git a/fs/dquot.c b/fs/dquot.c
index 1346eebe74ce..8ec4d6cc7633 100644
--- a/fs/dquot.c
+++ b/fs/dquot.c
@@ -1793,6 +1793,21 @@ static int vfs_quota_on_remount(struct super_block *sb, int type)
         return ret;
 }
 
+int vfs_quota_on_path(struct super_block *sb, int type, int format_id,
+                      struct path *path)
+{
+        int error = security_quota_on(path->dentry);
+        if (error)
+                return error;
+        /* Quota file not on the same filesystem? */
+        if (path->mnt->mnt_sb != sb)
+                error = -EXDEV;
+        else
+                error = vfs_quota_on_inode(path->dentry->d_inode, type,
+                                           format_id);
+        return error;
+}
+
 /* Actual function called from quotactl() */
 int vfs_quota_on(struct super_block *sb, int type, int format_id, char *path,
                  int remount)
@@ -1804,19 +1819,10 @@ int vfs_quota_on(struct super_block *sb, int type, int format_id, char *path,
                 return vfs_quota_on_remount(sb, type);
 
         error = path_lookup(path, LOOKUP_FOLLOW, &nd);
-        if (error < 0)
-                return error;
-        error = security_quota_on(nd.path.dentry);
-        if (error)
-                goto out_path;
-        /* Quota file not on the same filesystem? */
-        if (nd.path.mnt->mnt_sb != sb)
-                error = -EXDEV;
-        else
-                error = vfs_quota_on_inode(nd.path.dentry->d_inode, type,
-                                           format_id);
-out_path:
-        path_put(&nd.path);
+        if (!error) {
+                error = vfs_quota_on_path(sb, type, format_id, &nd.path);
+                path_put(&nd.path);
+        }
         return error;
 }
 
@@ -2185,6 +2191,7 @@ EXPORT_SYMBOL(unregister_quota_format);
 EXPORT_SYMBOL(dqstats);
 EXPORT_SYMBOL(dq_data_lock);
 EXPORT_SYMBOL(vfs_quota_on);
+EXPORT_SYMBOL(vfs_quota_on_path);
 EXPORT_SYMBOL(vfs_quota_on_mount);
 EXPORT_SYMBOL(vfs_quota_off);
 EXPORT_SYMBOL(vfs_quota_sync);
diff --git a/fs/ext3/super.c b/fs/ext3/super.c
index 8ddced384674..f38a5afc39a1 100644
--- a/fs/ext3/super.c
+++ b/fs/ext3/super.c
@@ -2810,8 +2810,9 @@ static int ext3_quota_on(struct super_block *sb, int type, int format_id,
                 journal_unlock_updates(EXT3_SB(sb)->s_journal);
         }
 
+        err = vfs_quota_on_path(sb, type, format_id, &nd.path);
         path_put(&nd.path);
-        return vfs_quota_on(sb, type, format_id, path, remount);
+        return err;
 }
 
 /* Read data from quotafile - avoid pagecache and such because we cannot afford
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index b5479b1dff14..1e69f29a8c55 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -3352,8 +3352,9 @@ static int ext4_quota_on(struct super_block *sb, int type, int format_id,
                 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
         }
 
+        err = vfs_quota_on_path(sb, type, format_id, &nd.path);
         path_put(&nd.path);
-        return vfs_quota_on(sb, type, format_id, path, remount);
+        return err;
 }
 
 /* Read data from quotafile - avoid pagecache and such because we cannot afford
diff --git a/fs/fcntl.c b/fs/fcntl.c
index 61d625136813..ac4f7db9f134 100644
--- a/fs/fcntl.c
+++ b/fs/fcntl.c
@@ -49,73 +49,6 @@ static int get_close_on_exec(unsigned int fd)
         return res;
 }
 
-/*
- * locate_fd finds a free file descriptor in the open_fds fdset,
- * expanding the fd arrays if necessary.  Must be called with the
- * file_lock held for write.
- */
-
-static int locate_fd(unsigned int orig_start, int cloexec)
-{
-        struct files_struct *files = current->files;
-        unsigned int newfd;
-        unsigned int start;
-        int error;
-        struct fdtable *fdt;
-
-        spin_lock(&files->file_lock);
-repeat:
-        fdt = files_fdtable(files);
-        /*
-         * Someone might have closed fd's in the range
-         * orig_start..fdt->next_fd
-         */
-        start = orig_start;
-        if (start < files->next_fd)
-                start = files->next_fd;
-
-        newfd = start;
-        if (start < fdt->max_fds)
-                newfd = find_next_zero_bit(fdt->open_fds->fds_bits,
-                                           fdt->max_fds, start);
-
-        error = expand_files(files, newfd);
-        if (error < 0)
-                goto out;
-
-        /*
-         * If we needed to expand the fs array we
-         * might have blocked - try again.
-         */
-        if (error)
-                goto repeat;
-
-        if (start <= files->next_fd)
-                files->next_fd = newfd + 1;
-
-        FD_SET(newfd, fdt->open_fds);
-        if (cloexec)
-                FD_SET(newfd, fdt->close_on_exec);
-        else
-                FD_CLR(newfd, fdt->close_on_exec);
-        error = newfd;
-
-out:
-        spin_unlock(&files->file_lock);
-        return error;
-}
-
-static int dupfd(struct file *file, unsigned int start, int cloexec)
-{
-        int fd = locate_fd(start, cloexec);
-        if (fd >= 0)
-                fd_install(fd, file);
-        else
-                fput(file);
-
-        return fd;
-}
-
 asmlinkage long sys_dup3(unsigned int oldfd, unsigned int newfd, int flags)
 {
         int err = -EBADF;
@@ -130,31 +63,35 @@ asmlinkage long sys_dup3(unsigned int oldfd, unsigned int newfd, int flags)
                 return -EINVAL;
 
         spin_lock(&files->file_lock);
-        if (!(file = fcheck(oldfd)))
-                goto out_unlock;
-        get_file(file);                 /* We are now finished with oldfd */
-
         err = expand_files(files, newfd);
+        file = fcheck(oldfd);
+        if (unlikely(!file))
+                goto Ebadf;
         if (unlikely(err < 0)) {
                 if (err == -EMFILE)
-                        err = -EBADF;
-                goto out_fput;
+                        goto Ebadf;
+                goto out_unlock;
         }
-
-        /* To avoid races with open() and dup(), we will mark the fd as
-         * in-use in the open-file bitmap throughout the entire dup2()
-         * process.  This is quite safe: do_close() uses the fd array
-         * entry, not the bitmap, to decide what work needs to be
-         * done.  --sct */
-        /* Doesn't work. open() might be there first. --AV */
-
-        /* Yes. It's a race. In user space. Nothing sane to do */
+        /*
+         * We need to detect attempts to do dup2() over allocated but still
+         * not finished descriptor.  NB: OpenBSD avoids that at the price of
+         * extra work in their equivalent of fget() - they insert struct
+         * file immediately after grabbing descriptor, mark it larval if
+         * more work (e.g. actual opening) is needed and make sure that
+         * fget() treats larval files as absent.  Potentially interesting,
+         * but while extra work in fget() is trivial, locking implications
+         * and amount of surgery on open()-related paths in VFS are not.
+         * FreeBSD fails with -EBADF in the same situation, NetBSD "solution"
+         * deadlocks in rather amusing ways, AFAICS.  All of that is out of
+         * scope of POSIX or SUS, since neither considers shared descriptor
+         * tables and this condition does not arise without those.
+         */
         err = -EBUSY;
         fdt = files_fdtable(files);
         tofree = fdt->fd[newfd];
         if (!tofree && FD_ISSET(newfd, fdt->open_fds))
-                goto out_fput;
-
+                goto out_unlock;
+        get_file(file);
         rcu_assign_pointer(fdt->fd[newfd], file);
         FD_SET(newfd, fdt->open_fds);
         if (flags & O_CLOEXEC)
@@ -165,17 +102,14 @@ asmlinkage long sys_dup3(unsigned int oldfd, unsigned int newfd, int flags)
 
         if (tofree)
                 filp_close(tofree, files);
-        err = newfd;
-out:
-        return err;
-out_unlock:
-        spin_unlock(&files->file_lock);
-        goto out;
 
-out_fput:
+        return newfd;
+
+Ebadf:
+        err = -EBADF;
+out_unlock:
         spin_unlock(&files->file_lock);
-        fput(file);
-        goto out;
+        return err;
 }
 
 asmlinkage long sys_dup2(unsigned int oldfd, unsigned int newfd)
@@ -194,10 +128,15 @@ asmlinkage long sys_dup2(unsigned int oldfd, unsigned int newfd)
 asmlinkage long sys_dup(unsigned int fildes)
 {
         int ret = -EBADF;
-        struct file * file = fget(fildes);
-
-        if (file)
-                ret = dupfd(file, 0, 0);
+        struct file *file = fget(fildes);
+
+        if (file) {
+                ret = get_unused_fd();
+                if (ret >= 0)
+                        fd_install(ret, file);
+                else
+                        fput(file);
+        }
         return ret;
 }
 
@@ -322,8 +261,11 @@ static long do_fcntl(int fd, unsigned int cmd, unsigned long arg,
         case F_DUPFD_CLOEXEC:
                 if (arg >= current->signal->rlim[RLIMIT_NOFILE].rlim_cur)
                         break;
-                get_file(filp);
-                err = dupfd(filp, arg, cmd == F_DUPFD_CLOEXEC);
+                err = alloc_fd(arg, cmd == F_DUPFD_CLOEXEC ? O_CLOEXEC : 0);
+                if (err >= 0) {
+                        get_file(filp);
+                        fd_install(err, filp);
+                }
                 break;
         case F_GETFD:
                 err = get_close_on_exec(fd) ? FD_CLOEXEC : 0;
diff --git a/fs/file.c b/fs/file.c
index d8773b19fe47..f313314f996f 100644
--- a/fs/file.c
+++ b/fs/file.c
@@ -6,6 +6,7 @@
  *  Manage the dynamic fd arrays in the process files_struct.
  */
 
+#include <linux/module.h>
 #include <linux/fs.h>
 #include <linux/mm.h>
 #include <linux/time.h>
@@ -432,3 +433,63 @@ struct files_struct init_files = {
         },
         .file_lock      = __SPIN_LOCK_UNLOCKED(init_task.file_lock),
 };
+
+/*
+ * allocate a file descriptor, mark it busy.
+ */
+int alloc_fd(unsigned start, unsigned flags)
+{
+        struct files_struct *files = current->files;
+        unsigned int fd;
+        int error;
+        struct fdtable *fdt;
+
+        spin_lock(&files->file_lock);
+repeat:
+        fdt = files_fdtable(files);
+        fd = start;
+        if (fd < files->next_fd)
+                fd = files->next_fd;
+
+        if (fd < fdt->max_fds)
+                fd = find_next_zero_bit(fdt->open_fds->fds_bits,
+                                           fdt->max_fds, fd);
+
+        error = expand_files(files, fd);
+        if (error < 0)
+                goto out;
+
+        /*
+         * If we needed to expand the fs array we
+         * might have blocked - try again.
+         */
+        if (error)
+                goto repeat;
+
+        if (start <= files->next_fd)
+                files->next_fd = fd + 1;
+
+        FD_SET(fd, fdt->open_fds);
+        if (flags & O_CLOEXEC)
+                FD_SET(fd, fdt->close_on_exec);
+        else
+                FD_CLR(fd, fdt->close_on_exec);
+        error = fd;
+#if 1
+        /* Sanity check */
+        if (rcu_dereference(fdt->fd[fd]) != NULL) {
+                printk(KERN_WARNING "alloc_fd: slot %d not NULL!\n", fd);
+                rcu_assign_pointer(fdt->fd[fd], NULL);
+        }
+#endif
+
+out:
+        spin_unlock(&files->file_lock);
+        return error;
+}
+
+int get_unused_fd(void)
+{
+        return alloc_fd(0, 0);
+}
+EXPORT_SYMBOL(get_unused_fd);
diff --git a/fs/namei.c b/fs/namei.c
index a7b0a0b80128..4ea63ed5e791 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -274,7 +274,7 @@ int inode_permission(struct inode *inode, int mask)
                 return retval;
 
         return security_inode_permission(inode,
-                        mask & (MAY_READ|MAY_WRITE|MAY_EXEC));
+                        mask & (MAY_READ|MAY_WRITE|MAY_EXEC|MAY_APPEND));
 }
 
 /**
@@ -1431,8 +1431,7 @@ static int may_delete(struct inode *dir,struct dentry *victim,int isdir)
  *  3. We should have write and exec permissions on dir
  *  4. We can't do it if dir is immutable (done in permission())
  */
-static inline int may_create(struct inode *dir, struct dentry *child,
-                             struct nameidata *nd)
+static inline int may_create(struct inode *dir, struct dentry *child)
 {
         if (child->d_inode)
                 return -EEXIST;
@@ -1504,7 +1503,7 @@ void unlock_rename(struct dentry *p1, struct dentry *p2)
 int vfs_create(struct inode *dir, struct dentry *dentry, int mode,
                 struct nameidata *nd)
 {
-        int error = may_create(dir, dentry, nd);
+        int error = may_create(dir, dentry);
 
         if (error)
                 return error;
@@ -1948,7 +1947,7 @@ EXPORT_SYMBOL_GPL(lookup_create);
 
 int vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev)
 {
-        int error = may_create(dir, dentry, NULL);
+        int error = may_create(dir, dentry);
 
         if (error)
                 return error;
@@ -2049,7 +2048,7 @@ asmlinkage long sys_mknod(const char __user *filename, int mode, unsigned dev)
 
 int vfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
 {
-        int error = may_create(dir, dentry, NULL);
+        int error = may_create(dir, dentry);
 
         if (error)
                 return error;
@@ -2316,7 +2315,7 @@ asmlinkage long sys_unlink(const char __user *pathname)
 
 int vfs_symlink(struct inode *dir, struct dentry *dentry, const char *oldname)
 {
-        int error = may_create(dir, dentry, NULL);
+        int error = may_create(dir, dentry);
 
         if (error)
                 return error;
@@ -2386,7 +2385,7 @@ int vfs_link(struct dentry *old_dentry, struct inode *dir, struct dentry *new_de
         if (!inode)
                 return -ENOENT;
 
-        error = may_create(dir, new_dentry, NULL);
+        error = may_create(dir, new_dentry);
         if (error)
                 return error;
 
@@ -2595,7 +2594,7 @@ int vfs_rename(struct inode *old_dir, struct dentry *old_dentry,
                 return error;
 
         if (!new_dentry->d_inode)
-                error = may_create(new_dir, new_dentry, NULL);
+                error = may_create(new_dir, new_dentry);
         else
                 error = may_delete(new_dir, new_dentry, is_dir);
         if (error)
diff --git a/fs/namespace.c b/fs/namespace.c
index 411728c0c8bb..6e283c93b50d 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -1667,31 +1667,31 @@ static noinline int do_new_mount(struct nameidata *nd, char *type, int flags,
         if (IS_ERR(mnt))
                 return PTR_ERR(mnt);
 
-        return do_add_mount(mnt, nd, mnt_flags, NULL);
+        return do_add_mount(mnt, &nd->path, mnt_flags, NULL);
 }
 
 /*
  * add a mount into a namespace's mount tree
  * - provide the option of adding the new mount to an expiration list
  */
-int do_add_mount(struct vfsmount *newmnt, struct nameidata *nd,
+int do_add_mount(struct vfsmount *newmnt, struct path *path,
                  int mnt_flags, struct list_head *fslist)
 {
         int err;
 
         down_write(&namespace_sem);
         /* Something was mounted here while we slept */
-        while (d_mountpoint(nd->path.dentry) &&
-               follow_down(&nd->path.mnt, &nd->path.dentry))
+        while (d_mountpoint(path->dentry) &&
+               follow_down(&path->mnt, &path->dentry))
                 ;
         err = -EINVAL;
-        if (!check_mnt(nd->path.mnt))
+        if (!check_mnt(path->mnt))
                 goto unlock;
 
         /* Refuse the same filesystem on the same mount point */
         err = -EBUSY;
-        if (nd->path.mnt->mnt_sb == newmnt->mnt_sb &&
-            nd->path.mnt->mnt_root == nd->path.dentry)
+        if (path->mnt->mnt_sb == newmnt->mnt_sb &&
+            path->mnt->mnt_root == path->dentry)
                 goto unlock;
 
         err = -EINVAL;
@@ -1699,7 +1699,7 @@ int do_add_mount(struct vfsmount *newmnt, struct nameidata *nd,
                 goto unlock;
 
         newmnt->mnt_flags = mnt_flags;
-        if ((err = graft_tree(newmnt, &nd->path)))
+        if ((err = graft_tree(newmnt, path)))
                 goto unlock;
 
         if (fslist) /* add to the specified expiration list */
diff --git a/fs/nfs/namespace.c b/fs/nfs/namespace.c
index 2f285ef76399..66df08dd1caf 100644
--- a/fs/nfs/namespace.c
+++ b/fs/nfs/namespace.c
@@ -129,7 +129,7 @@ static void * nfs_follow_mountpoint(struct dentry *dentry, struct nameidata *nd)
                 goto out_err;
 
         mntget(mnt);
-        err = do_add_mount(mnt, nd, nd->path.mnt->mnt_flags|MNT_SHRINKABLE,
+        err = do_add_mount(mnt, &nd->path, nd->path.mnt->mnt_flags|MNT_SHRINKABLE,
                            &nfs_automount_list);
         if (err < 0) {
                 mntput(mnt);
diff --git a/fs/open.c b/fs/open.c
index 52647be277a2..07da9359481c 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -963,62 +963,6 @@ struct file *dentry_open(struct dentry *dentry, struct vfsmount *mnt, int flags)
 }
 EXPORT_SYMBOL(dentry_open);
 
-/*
- * Find an empty file descriptor entry, and mark it busy.
- */
-int get_unused_fd_flags(int flags)
-{
-        struct files_struct * files = current->files;
-        int fd, error;
-        struct fdtable *fdt;
-
-        spin_lock(&files->file_lock);
-
-repeat:
-        fdt = files_fdtable(files);
-        fd = find_next_zero_bit(fdt->open_fds->fds_bits, fdt->max_fds,
-                                files->next_fd);
-
-        /* Do we need to expand the fd array or fd set?  */
-        error = expand_files(files, fd);
-        if (error < 0)
-                goto out;
-
-        if (error) {
-                /*
-                 * If we needed to expand the fs array we
-                 * might have blocked - try again.
-                 */
-                goto repeat;
-        }
-
-        FD_SET(fd, fdt->open_fds);
-        if (flags & O_CLOEXEC)
-                FD_SET(fd, fdt->close_on_exec);
-        else
-                FD_CLR(fd, fdt->close_on_exec);
-        files->next_fd = fd + 1;
-#if 1
-        /* Sanity check */
-        if (fdt->fd[fd] != NULL) {
-                printk(KERN_WARNING "get_unused_fd: slot %d not NULL!\n", fd);
-                fdt->fd[fd] = NULL;
-        }
-#endif
-        error = fd;
-
-out:
-        spin_unlock(&files->file_lock);
-        return error;
-}
-
-int get_unused_fd(void)
-{
-        return get_unused_fd_flags(0);
-}
-
-EXPORT_SYMBOL(get_unused_fd);
-
 static void __put_unused_fd(struct files_struct *files, unsigned int fd)
 {
         struct fdtable *fdt = files_fdtable(files);
diff --git a/fs/proc/generic.c b/fs/proc/generic.c
index cb4096cc3fb7..4fb81e9c94e3 100644
--- a/fs/proc/generic.c
+++ b/fs/proc/generic.c
@@ -300,10 +300,10 @@ out:
         return rtn;
 }
 
-static DEFINE_IDR(proc_inum_idr);
+static DEFINE_IDA(proc_inum_ida);
 static DEFINE_SPINLOCK(proc_inum_lock); /* protects the above */
 
-#define PROC_DYNAMIC_FIRST 0xF0000000UL
+#define PROC_DYNAMIC_FIRST 0xF0000000U
 
 /*
  * Return an inode number between PROC_DYNAMIC_FIRST and
@@ -311,36 +311,33 @@ static DEFINE_SPINLOCK(proc_inum_lock); /* protects the above */
  */
 static unsigned int get_inode_number(void)
 {
-        int i, inum = 0;
+        unsigned int i;
         int error;
 
 retry:
-        if (idr_pre_get(&proc_inum_idr, GFP_KERNEL) == 0)
+        if (ida_pre_get(&proc_inum_ida, GFP_KERNEL) == 0)
                 return 0;
 
         spin_lock(&proc_inum_lock);
-        error = idr_get_new(&proc_inum_idr, NULL, &i);
+        error = ida_get_new(&proc_inum_ida, &i);
         spin_unlock(&proc_inum_lock);
         if (error == -EAGAIN)
                 goto retry;
         else if (error)
                 return 0;
 
-        inum = (i & MAX_ID_MASK) + PROC_DYNAMIC_FIRST;
-
-        /* inum will never be more than 0xf0ffffff, so no check
-         * for overflow.
-         */
-
-        return inum;
+        if (i > UINT_MAX - PROC_DYNAMIC_FIRST) {
+                spin_lock(&proc_inum_lock);
+                ida_remove(&proc_inum_ida, i);
+                spin_unlock(&proc_inum_lock);
+        }
+        return PROC_DYNAMIC_FIRST + i;
 }
 
 static void release_inode_number(unsigned int inum)
 {
-        int id = (inum - PROC_DYNAMIC_FIRST) | ~MAX_ID_MASK;
-
         spin_lock(&proc_inum_lock);
-        idr_remove(&proc_inum_idr, id);
+        ida_remove(&proc_inum_ida, inum - PROC_DYNAMIC_FIRST);
         spin_unlock(&proc_inum_lock);
 }
 
diff --git a/fs/reiserfs/super.c b/fs/reiserfs/super.c
index 879e54d35c2d..282a13596c70 100644
--- a/fs/reiserfs/super.c
+++ b/fs/reiserfs/super.c
@@ -2076,8 +2076,8 @@ static int reiserfs_quota_on(struct super_block *sb, int type, int format_id,
                 return err;
         /* Quotafile not on the same filesystem? */
         if (nd.path.mnt->mnt_sb != sb) {
-                path_put(&nd.path);
-                return -EXDEV;
+                err = -EXDEV;
+                goto out;
         }
         inode = nd.path.dentry->d_inode;
         /* We must not pack tails for quota files on reiserfs for quota IO to work */
@@ -2087,8 +2087,8 @@ static int reiserfs_quota_on(struct super_block *sb, int type, int format_id,
                         reiserfs_warning(sb,
                                 "reiserfs: Unpacking tail of quota file failed"
                                 " (%d). Cannot turn on quotas.", err);
-                        path_put(&nd.path);
-                        return -EINVAL;
+                        err = -EINVAL;
+                        goto out;
                 }
                 mark_inode_dirty(inode);
         }
@@ -2109,13 +2109,15 @@ static int reiserfs_quota_on(struct super_block *sb, int type, int format_id,
                 /* Just start temporary transaction and finish it */
                 err = journal_begin(&th, sb, 1);
                 if (err)
-                        return err;
+                        goto out;
                 err = journal_end_sync(&th, sb, 1);
                 if (err)
-                        return err;
+                        goto out;
         }
+        err = vfs_quota_on_path(sb, type, format_id, &nd.path);
+out:
         path_put(&nd.path);
-        return vfs_quota_on(sb, type, format_id, path, 0);
+        return err;
 }
 
 /* Read data from quotafile - avoid pagecache and such because we cannot afford
diff --git a/include/linux/file.h b/include/linux/file.h
index 27c64bdc68c9..a20259e248a5 100644
--- a/include/linux/file.h
+++ b/include/linux/file.h
@@ -34,8 +34,9 @@ extern struct file *fget(unsigned int fd);
 extern struct file *fget_light(unsigned int fd, int *fput_needed);
 extern void set_close_on_exec(unsigned int fd, int flag);
 extern void put_filp(struct file *);
+extern int alloc_fd(unsigned start, unsigned flags);
 extern int get_unused_fd(void);
-extern int get_unused_fd_flags(int flags);
+#define get_unused_fd_flags(flags) alloc_fd(0, (flags))
 extern void put_unused_fd(unsigned int fd);
 
 extern void fd_install(unsigned int fd, struct file *file);
diff --git a/include/linux/mount.h b/include/linux/mount.h
index b5efaa2132ab..30a1d63b6fb5 100644
--- a/include/linux/mount.h
+++ b/include/linux/mount.h
@@ -105,7 +105,8 @@ extern struct vfsmount *vfs_kern_mount(struct file_system_type *type,
 
 struct nameidata;
 
-extern int do_add_mount(struct vfsmount *newmnt, struct nameidata *nd,
+struct path;
+extern int do_add_mount(struct vfsmount *newmnt, struct path *path,
                         int mnt_flags, struct list_head *fslist);
 
 extern void mark_mounts_for_expiry(struct list_head *mounts);
diff --git a/include/linux/quotaops.h b/include/linux/quotaops.h
index 742187f7a05c..ca6b9b5c8d52 100644
--- a/include/linux/quotaops.h
+++ b/include/linux/quotaops.h
@@ -43,6 +43,8 @@ int dquot_mark_dquot_dirty(struct dquot *dquot);
 
 int vfs_quota_on(struct super_block *sb, int type, int format_id,
         char *path, int remount);
+int vfs_quota_on_path(struct super_block *sb, int type, int format_id,
+        struct path *path);
 int vfs_quota_on_mount(struct super_block *sb, char *qf_name,
         int format_id, int type);
 int vfs_quota_off(struct super_block *sb, int type, int remount);
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 380d6474cf66..a72a5ad46ec5 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -3216,6 +3216,7 @@ int __init ip_rt_init(void)
         return rc;
 }
 
+#ifdef CONFIG_SYSCTL
 /*
  * We really need to sanitize the damn ipv4 init order, then all
  * this nonsense will go away.
@@ -3224,6 +3225,7 @@ void __init ip_static_sysctl_init(void)
 {
         register_sysctl_paths(ipv4_route_path, ipv4_route_table);
 }
+#endif
 
 EXPORT_SYMBOL(__ip_select_ident);
 EXPORT_SYMBOL(ip_route_input);