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authorMike Frysinger2005-05-09 22:10:42 +0000
committerMike Frysinger2005-05-09 22:10:42 +0000
commit1fd98e039d146dcff02a5350f509cabca65fd29c (patch)
tree1564707d41a6271bb44cf3fa5b88b9cc70fedd35 /e2fsprogs/ext2fs/valid_blk.c
parentb32011943a0764872ca1ea17f13b53176ace8e69 (diff)
downloadbusybox-1fd98e039d146dcff02a5350f509cabca65fd29c.zip
busybox-1fd98e039d146dcff02a5350f509cabca65fd29c.tar.gz
import ext2fs lib to prep for new e2fsprogs
Diffstat (limited to 'e2fsprogs/ext2fs/valid_blk.c')
-rw-r--r--e2fsprogs/ext2fs/valid_blk.c56
1 files changed, 56 insertions, 0 deletions
diff --git a/e2fsprogs/ext2fs/valid_blk.c b/e2fsprogs/ext2fs/valid_blk.c
new file mode 100644
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--- /dev/null
+++ b/e2fsprogs/ext2fs/valid_blk.c
@@ -0,0 +1,56 @@
+/*
+ * valid_blk.c --- does the inode have valid blocks?
+ *
+ * Copyright 1997 by Theodore Ts'o
+ *
+ * %Begin-Header%
+ * This file may be redistributed under the terms of the GNU Public
+ * License.
+ * %End-Header%
+ *
+ */
+
+#include <stdio.h>
+#if HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+#include <string.h>
+#include <time.h>
+
+#include "ext2_fs.h"
+#include "ext2fs.h"
+
+/*
+ * This function returns 1 if the inode's block entries actually
+ * contain block entries.
+ */
+int ext2fs_inode_has_valid_blocks(struct ext2_inode *inode)
+{
+ /*
+ * Only directories, regular files, and some symbolic links
+ * have valid block entries.
+ */
+ if (!LINUX_S_ISDIR(inode->i_mode) && !LINUX_S_ISREG(inode->i_mode) &&
+ !LINUX_S_ISLNK(inode->i_mode))
+ return 0;
+
+ /*
+ * If the symbolic link is a "fast symlink", then the symlink
+ * target is stored in the block entries.
+ */
+ if (LINUX_S_ISLNK (inode->i_mode)) {
+ if (inode->i_file_acl == 0) {
+ /* With no EA block, we can rely on i_blocks */
+ if (inode->i_blocks == 0)
+ return 0;
+ } else {
+ /* With an EA block, life gets more tricky */
+ if (inode->i_size >= EXT2_N_BLOCKS*4)
+ return 1; /* definitely using i_block[] */
+ if (inode->i_size > 4 && inode->i_block[1] == 0)
+ return 1; /* definitely using i_block[] */
+ return 0; /* Probably a fast symlink */
+ }
+ }
+ return 1;
+}