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@xxxxxxxxxxxxx>
Reviewed-by: Darren Hart <dvhart@xxxxxxxxxxxxxxx>
---
misc/create_inode.c | 72 +++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 72 insertions(+)
diff --git a/misc/create_inode.c b/misc/create_inode.c
index 7f98499..cea37c9 100644
--- 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 */
--
1.7.10.4
--
To unsubscribe from this list: send the line "unsubscribe linux-ext4" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
