FreeBSD/Linux Kernel Cross Reference
sys/fs/bad_inode.c

     /*
      *  linux/fs/bad_inode.c
      *
      *  Copyright (C) 1997, Stephen Tweedie
      *
      *  Provide stub functions for unreadable inodes
      *
      *  Fabian Frederick : August 2003 - All file operations assigned to EIO
      */
    
    #include <linux/fs.h>
    #include <linux/export.h>
    #include <linux/stat.h>
    #include <linux/time.h>
    #include <linux/namei.h>
    #include <linux/poll.h>
    
    
    static loff_t bad_file_llseek(struct file *file, loff_t offset, int whence)
    {
            return -EIO;
    }
    
    static ssize_t bad_file_read(struct file *filp, char __user *buf,
                            size_t size, loff_t *ppos)
    {
            return -EIO;
    }
    
    static ssize_t bad_file_write(struct file *filp, const char __user *buf,
                            size_t siz, loff_t *ppos)
    {
            return -EIO;
    }
    
    static ssize_t bad_file_aio_read(struct kiocb *iocb, const struct iovec *iov,
                            unsigned long nr_segs, loff_t pos)
    {
            return -EIO;
    }
    
    static ssize_t bad_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
                            unsigned long nr_segs, loff_t pos)
    {
            return -EIO;
    }
    
    static int bad_file_readdir(struct file *filp, void *dirent, filldir_t filldir)
    {
            return -EIO;
    }
    
    static unsigned int bad_file_poll(struct file *filp, poll_table *wait)
    {
            return POLLERR;
    }
    
    static long bad_file_unlocked_ioctl(struct file *file, unsigned cmd,
                            unsigned long arg)
    {
            return -EIO;
    }
    
    static long bad_file_compat_ioctl(struct file *file, unsigned int cmd,
                            unsigned long arg)
    {
            return -EIO;
    }
    
    static int bad_file_mmap(struct file *file, struct vm_area_struct *vma)
    {
            return -EIO;
    }
    
    static int bad_file_open(struct inode *inode, struct file *filp)
    {
            return -EIO;
    }
    
    static int bad_file_flush(struct file *file, fl_owner_t id)
    {
            return -EIO;
    }
    
    static int bad_file_release(struct inode *inode, struct file *filp)
    {
            return -EIO;
    }
    
    static int bad_file_fsync(struct file *file, loff_t start, loff_t end,
                              int datasync)
    {
            return -EIO;
    }
    
    static int bad_file_aio_fsync(struct kiocb *iocb, int datasync)
    {
            return -EIO;
    }
   
   static int bad_file_fasync(int fd, struct file *filp, int on)
   {
           return -EIO;
   }
   
   static int bad_file_lock(struct file *file, int cmd, struct file_lock *fl)
   {
           return -EIO;
   }
   
   static ssize_t bad_file_sendpage(struct file *file, struct page *page,
                           int off, size_t len, loff_t *pos, int more)
   {
           return -EIO;
   }
   
   static unsigned long bad_file_get_unmapped_area(struct file *file,
                                   unsigned long addr, unsigned long len,
                                   unsigned long pgoff, unsigned long flags)
   {
           return -EIO;
   }
   
   static int bad_file_check_flags(int flags)
   {
           return -EIO;
   }
   
   static int bad_file_flock(struct file *filp, int cmd, struct file_lock *fl)
   {
           return -EIO;
   }
   
   static ssize_t bad_file_splice_write(struct pipe_inode_info *pipe,
                           struct file *out, loff_t *ppos, size_t len,
                           unsigned int flags)
   {
           return -EIO;
   }
   
   static ssize_t bad_file_splice_read(struct file *in, loff_t *ppos,
                           struct pipe_inode_info *pipe, size_t len,
                           unsigned int flags)
   {
           return -EIO;
   }
   
   static const struct file_operations bad_file_ops =
   {
           .llseek         = bad_file_llseek,
           .read           = bad_file_read,
           .write          = bad_file_write,
           .aio_read       = bad_file_aio_read,
           .aio_write      = bad_file_aio_write,
           .readdir        = bad_file_readdir,
           .poll           = bad_file_poll,
           .unlocked_ioctl = bad_file_unlocked_ioctl,
           .compat_ioctl   = bad_file_compat_ioctl,
           .mmap           = bad_file_mmap,
           .open           = bad_file_open,
           .flush          = bad_file_flush,
           .release        = bad_file_release,
           .fsync          = bad_file_fsync,
           .aio_fsync      = bad_file_aio_fsync,
           .fasync         = bad_file_fasync,
           .lock           = bad_file_lock,
           .sendpage       = bad_file_sendpage,
           .get_unmapped_area = bad_file_get_unmapped_area,
           .check_flags    = bad_file_check_flags,
           .flock          = bad_file_flock,
           .splice_write   = bad_file_splice_write,
           .splice_read    = bad_file_splice_read,
   };
   
   static int bad_inode_create (struct inode *dir, struct dentry *dentry,
                   umode_t mode, bool excl)
   {
           return -EIO;
   }
   
   static struct dentry *bad_inode_lookup(struct inode *dir,
                           struct dentry *dentry, unsigned int flags)
   {
           return ERR_PTR(-EIO);
   }
   
   static int bad_inode_link (struct dentry *old_dentry, struct inode *dir,
                   struct dentry *dentry)
   {
           return -EIO;
   }
   
   static int bad_inode_unlink(struct inode *dir, struct dentry *dentry)
   {
           return -EIO;
   }
   
   static int bad_inode_symlink (struct inode *dir, struct dentry *dentry,
                   const char *symname)
   {
           return -EIO;
   }
   
   static int bad_inode_mkdir(struct inode *dir, struct dentry *dentry,
                           umode_t mode)
   {
           return -EIO;
   }
   
   static int bad_inode_rmdir (struct inode *dir, struct dentry *dentry)
   {
           return -EIO;
   }
   
   static int bad_inode_mknod (struct inode *dir, struct dentry *dentry,
                           umode_t mode, dev_t rdev)
   {
           return -EIO;
   }
   
   static int bad_inode_rename (struct inode *old_dir, struct dentry *old_dentry,
                   struct inode *new_dir, struct dentry *new_dentry)
   {
           return -EIO;
   }
   
   static int bad_inode_readlink(struct dentry *dentry, char __user *buffer,
                   int buflen)
   {
           return -EIO;
   }
   
   static int bad_inode_permission(struct inode *inode, int mask)
   {
           return -EIO;
   }
   
   static int bad_inode_getattr(struct vfsmount *mnt, struct dentry *dentry,
                           struct kstat *stat)
   {
           return -EIO;
   }
   
   static int bad_inode_setattr(struct dentry *direntry, struct iattr *attrs)
   {
           return -EIO;
   }
   
   static int bad_inode_setxattr(struct dentry *dentry, const char *name,
                   const void *value, size_t size, int flags)
   {
           return -EIO;
   }
   
   static ssize_t bad_inode_getxattr(struct dentry *dentry, const char *name,
                           void *buffer, size_t size)
   {
           return -EIO;
   }
   
   static ssize_t bad_inode_listxattr(struct dentry *dentry, char *buffer,
                           size_t buffer_size)
   {
           return -EIO;
   }
   
   static int bad_inode_removexattr(struct dentry *dentry, const char *name)
   {
           return -EIO;
   }
   
   static const struct inode_operations bad_inode_ops =
   {
           .create         = bad_inode_create,
           .lookup         = bad_inode_lookup,
           .link           = bad_inode_link,
           .unlink         = bad_inode_unlink,
           .symlink        = bad_inode_symlink,
           .mkdir          = bad_inode_mkdir,
           .rmdir          = bad_inode_rmdir,
           .mknod          = bad_inode_mknod,
           .rename         = bad_inode_rename,
           .readlink       = bad_inode_readlink,
           /* follow_link must be no-op, otherwise unmounting this inode
              won't work */
           /* put_link returns void */
           /* truncate returns void */
           .permission     = bad_inode_permission,
           .getattr        = bad_inode_getattr,
           .setattr        = bad_inode_setattr,
           .setxattr       = bad_inode_setxattr,
           .getxattr       = bad_inode_getxattr,
           .listxattr      = bad_inode_listxattr,
           .removexattr    = bad_inode_removexattr,
   };
   
   
   /*
    * When a filesystem is unable to read an inode due to an I/O error in
    * its read_inode() function, it can call make_bad_inode() to return a
    * set of stubs which will return EIO errors as required. 
    *
    * We only need to do limited initialisation: all other fields are
    * preinitialised to zero automatically.
    */
    
   /**
    *      make_bad_inode - mark an inode bad due to an I/O error
    *      @inode: Inode to mark bad
    *
    *      When an inode cannot be read due to a media or remote network
    *      failure this function makes the inode "bad" and causes I/O operations
    *      on it to fail from this point on.
    */
    
   void make_bad_inode(struct inode *inode)
   {
           remove_inode_hash(inode);
   
           inode->i_mode = S_IFREG;
           inode->i_atime = inode->i_mtime = inode->i_ctime =
                   current_fs_time(inode->i_sb);
           inode->i_op = &bad_inode_ops;   
           inode->i_fop = &bad_file_ops;   
   }
   EXPORT_SYMBOL(make_bad_inode);
   
   /*
    * This tests whether an inode has been flagged as bad. The test uses
    * &bad_inode_ops to cover the case of invalidated inodes as well as
    * those created by make_bad_inode() above.
    */
    
   /**
    *      is_bad_inode - is an inode errored
    *      @inode: inode to test
    *
    *      Returns true if the inode in question has been marked as bad.
    */
    
   int is_bad_inode(struct inode *inode)
   {
           return (inode->i_op == &bad_inode_ops); 
   }
   
   EXPORT_SYMBOL(is_bad_inode);
   
   /**
    * iget_failed - Mark an under-construction inode as dead and release it
    * @inode: The inode to discard
    *
    * Mark an under-construction inode as dead and release it.
    */
   void iget_failed(struct inode *inode)
   {
           make_bad_inode(inode);
           unlock_new_inode(inode);
           iput(inode);
   }
   EXPORT_SYMBOL(iget_failed);

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