fs/stack.c

   1 #include <linux/module.h>
   2 #include <linux/fs.h>
   3 #include <linux/fs_stack.h>
   4
   5 /* does _NOT_ require i_mutex to be held.
   6  *
   7  * This function cannot be inlined since i_size_{read,write} is rather
   8  * heavy-weight on 32-bit systems
   9  */
  10 void fsstack_copy_inode_size(struct inode *dst, const struct inode *src)
  11 {
  12         i_size_write(dst, i_size_read((struct inode *)src));
  13         dst->i_blocks = src->i_blocks;
  14 }
  15 EXPORT_SYMBOL_GPL(fsstack_copy_inode_size);
  16
  17 /* copy all attributes; get_nlinks is optional way to override the i_nlink
  18  * copying
  19  */
  20 void fsstack_copy_attr_all(struct inode *dest, const struct inode *src,
  21                                 int (*get_nlinks)(struct inode *))
  22 {
  23         dest->i_mode = src->i_mode;
  24         dest->i_uid = src->i_uid;
  25         dest->i_gid = src->i_gid;
  26         dest->i_rdev = src->i_rdev;
  27         dest->i_atime = src->i_atime;
  28         dest->i_mtime = src->i_mtime;
  29         dest->i_ctime = src->i_ctime;
  30         dest->i_blkbits = src->i_blkbits;
  31         dest->i_flags = src->i_flags;
  32
  33         /*
  34          * Update the nlinks AFTER updating the above fields, because the
  35          * get_links callback may depend on them.
  36          */
  37         if (!get_nlinks)
  38                 dest->i_nlink = src->i_nlink;
  39         else
  40                 dest->i_nlink = (*get_nlinks)(dest);
  41 }
  42 EXPORT_SYMBOL_GPL(fsstack_copy_attr_all);