misc/create_inode.c: create special file

The do_mknod_internal() is used for creating special file which is
block, character and fifo, most of the code are from debugfs/debugfs.c,
the debugfs/debugfs.c will be modified to use this function.

Signed-off-by: Robert Yang <liezhi.yang@windriver.com>
Reviewed-by: Darren Hart <dvhart@linux.intel.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>

diff --git a/misc/create_inode.c b/misc/create_inode.c
index b68b910..4da8aff 100644 (file)
--- a/misc/create_inode.c
+++ b/misc/create_inode.c
@@ -11,6 +11,78 @@
 /* Make a special file which is block, character and fifo */
 errcode_t do_mknod_internal(ext2_ino_t cwd, const char *name, struct stat *st)
 {
+       ext2_ino_t              ino;
+       errcode_t               retval;
+       struct ext2_inode       inode;
+       unsigned long           major, minor, mode;
+       int                     filetype;
+
+       switch(st->st_mode & S_IFMT) {
+               case S_IFCHR:
+                       mode = LINUX_S_IFCHR;
+                       filetype = EXT2_FT_CHRDEV;
+                       break;
+               case S_IFBLK:
+                       mode = LINUX_S_IFBLK;
+                       filetype =  EXT2_FT_BLKDEV;
+                       break;
+               case S_IFIFO:
+                       mode = LINUX_S_IFIFO;
+                       filetype = EXT2_FT_FIFO;
+                       break;
+       }
+
+       if (!(current_fs->flags & EXT2_FLAG_RW)) {
+               com_err(__func__, 0, "Filesystem opened read/only");
+               return -1;
+       }
+       retval = ext2fs_new_inode(current_fs, cwd, 010755, 0, &ino);
+       if (retval) {
+               com_err(__func__, retval, 0);
+               return retval;
+       }
+
+#ifdef DEBUGFS
+       printf("Allocated inode: %u\n", ino);
+#endif
+       retval = ext2fs_link(current_fs, cwd, name, ino, filetype);
+       if (retval == EXT2_ET_DIR_NO_SPACE) {
+               retval = ext2fs_expand_dir(current_fs, cwd);
+               if (retval) {
+                       com_err(__func__, retval, "while expanding directory");
+                       return retval;
+               }
+               retval = ext2fs_link(current_fs, cwd, name, ino, filetype);
+       }
+       if (retval) {
+               com_err(name, retval, 0);
+               return -1;
+       }
+        if (ext2fs_test_inode_bitmap2(current_fs->inode_map, ino))
+               com_err(__func__, 0, "Warning: inode already set");
+       ext2fs_inode_alloc_stats2(current_fs, ino, +1, 0);
+       memset(&inode, 0, sizeof(inode));
+       inode.i_mode = mode;
+       inode.i_atime = inode.i_ctime = inode.i_mtime =
+               current_fs->now ? current_fs->now : time(0);
+
+       major = major(st->st_rdev);
+       minor = minor(st->st_rdev);
+
+       if ((major < 256) && (minor < 256)) {
+               inode.i_block[0] = major * 256 + minor;
+               inode.i_block[1] = 0;
+       } else {
+               inode.i_block[0] = 0;
+               inode.i_block[1] = (minor & 0xff) | (major << 8) | ((minor & ~0xff) << 12);
+       }
+       inode.i_links_count = 1;
+
+       retval = ext2fs_write_new_inode(current_fs, ino, &inode);
+       if (retval)
+               com_err(__func__, retval, "while creating inode %u", ino);
+
+       return retval;
 }
 
 /* Make a symlink name -> target */