The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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    1 /*
    2  *  linux/fs/bad_inode.c
    3  *
    4  *  Copyright (C) 1997, Stephen Tweedie
    5  *
    6  *  Provide stub functions for unreadable inodes
    7  */
    8 
    9 #include <linux/fs.h>
   10 #include <linux/stat.h>
   11 #include <linux/sched.h>
   12 
   13 /*
   14  * The follow_link operation is special: it must behave as a no-op
   15  * so that a bad root inode can at least be unmounted. To do this
   16  * we must dput() the base and return the dentry with a dget().
   17  */
   18 static int bad_follow_link(struct dentry *dent, struct nameidata *nd)
   19 {
   20         return vfs_follow_link(nd, ERR_PTR(-EIO));
   21 }
   22 
   23 static int return_EIO(void)
   24 {
   25         return -EIO;
   26 }
   27 
   28 #define EIO_ERROR ((void *) (return_EIO))
   29 
   30 static struct file_operations bad_file_ops =
   31 {
   32         llseek:         EIO_ERROR,
   33         read:           EIO_ERROR,
   34         write:          EIO_ERROR,
   35         readdir:        EIO_ERROR,
   36         poll:           EIO_ERROR,
   37         ioctl:          EIO_ERROR,
   38         mmap:           EIO_ERROR,
   39         open:           EIO_ERROR,
   40         flush:          EIO_ERROR,
   41         release:        EIO_ERROR,
   42         fsync:          EIO_ERROR,
   43         fasync:         EIO_ERROR,
   44         lock:           EIO_ERROR,
   45 };
   46 
   47 struct inode_operations bad_inode_ops =
   48 {
   49         create:         EIO_ERROR,
   50         lookup:         EIO_ERROR,
   51         link:           EIO_ERROR,
   52         unlink:         EIO_ERROR,
   53         symlink:        EIO_ERROR,
   54         mkdir:          EIO_ERROR,
   55         rmdir:          EIO_ERROR,
   56         mknod:          EIO_ERROR,
   57         rename:         EIO_ERROR,
   58         readlink:       EIO_ERROR,
   59         follow_link:    bad_follow_link,
   60         truncate:       EIO_ERROR,
   61         permission:     EIO_ERROR,
   62         revalidate:     EIO_ERROR,
   63 };
   64 
   65 
   66 /*
   67  * When a filesystem is unable to read an inode due to an I/O error in
   68  * its read_inode() function, it can call make_bad_inode() to return a
   69  * set of stubs which will return EIO errors as required. 
   70  *
   71  * We only need to do limited initialisation: all other fields are
   72  * preinitialised to zero automatically.
   73  */
   74  
   75 /**
   76  *      make_bad_inode - mark an inode bad due to an I/O error
   77  *      @inode: Inode to mark bad
   78  *
   79  *      When an inode cannot be read due to a media or remote network
   80  *      failure this function makes the inode "bad" and causes I/O operations
   81  *      on it to fail from this point on.
   82  */
   83  
   84 void make_bad_inode(struct inode * inode) 
   85 {
   86         inode->i_mode = S_IFREG;
   87         inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
   88         inode->i_op = &bad_inode_ops;   
   89         inode->i_fop = &bad_file_ops;   
   90 }
   91 
   92 /*
   93  * This tests whether an inode has been flagged as bad. The test uses
   94  * &bad_inode_ops to cover the case of invalidated inodes as well as
   95  * those created by make_bad_inode() above.
   96  */
   97  
   98 /**
   99  *      is_bad_inode - is an inode errored
  100  *      @inode: inode to test
  101  *
  102  *      Returns true if the inode in question has been marked as bad.
  103  */
  104  
  105 int is_bad_inode(struct inode * inode) 
  106 {
  107         return (inode->i_op == &bad_inode_ops); 
  108 }

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