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authorDenis Vlasenko2006-12-26 01:30:59 +0000
committerDenis Vlasenko2006-12-26 01:30:59 +0000
commitc4f623ef2a7980a63de7c9f1d539a656b83f10e7 (patch)
treea294e28b0112052cb9d58b403554b3390e76f50c /e2fsprogs/old_e2fsprogs/ext2fs/link.c
parent64c54025842f205ad722675105b88044a5b6845a (diff)
downloadbusybox-c4f623ef2a7980a63de7c9f1d539a656b83f10e7.zip
busybox-c4f623ef2a7980a63de7c9f1d539a656b83f10e7.tar.gz
put small subset of e2fsprogs back in the tree:
lsattr, chattr, fsck. Old e2fsprogs tree is in e2fsprogs/old_e2fsprogs/*.
Diffstat (limited to 'e2fsprogs/old_e2fsprogs/ext2fs/link.c')
-rw-r--r--e2fsprogs/old_e2fsprogs/ext2fs/link.c135
1 files changed, 135 insertions, 0 deletions
diff --git a/e2fsprogs/old_e2fsprogs/ext2fs/link.c b/e2fsprogs/old_e2fsprogs/ext2fs/link.c
new file mode 100644
index 0000000..08b2e96
--- /dev/null
+++ b/e2fsprogs/old_e2fsprogs/ext2fs/link.c
@@ -0,0 +1,135 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * link.c --- create links in a ext2fs directory
+ *
+ * Copyright (C) 1993, 1994 Theodore Ts'o.
+ *
+ * %Begin-Header%
+ * This file may be redistributed under the terms of the GNU Public
+ * License.
+ * %End-Header%
+ */
+
+#include <stdio.h>
+#include <string.h>
+#if HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+
+#include "ext2_fs.h"
+#include "ext2fs.h"
+
+struct link_struct {
+ const char *name;
+ int namelen;
+ ext2_ino_t inode;
+ int flags;
+ int done;
+ struct ext2_super_block *sb;
+};
+
+static int link_proc(struct ext2_dir_entry *dirent,
+ int offset,
+ int blocksize,
+ char *buf,
+ void *priv_data)
+{
+ struct link_struct *ls = (struct link_struct *) priv_data;
+ struct ext2_dir_entry *next;
+ int rec_len, min_rec_len;
+ int ret = 0;
+
+ rec_len = EXT2_DIR_REC_LEN(ls->namelen);
+
+ /*
+ * See if the following directory entry (if any) is unused;
+ * if so, absorb it into this one.
+ */
+ next = (struct ext2_dir_entry *) (buf + offset + dirent->rec_len);
+ if ((offset + dirent->rec_len < blocksize - 8) &&
+ (next->inode == 0) &&
+ (offset + dirent->rec_len + next->rec_len <= blocksize)) {
+ dirent->rec_len += next->rec_len;
+ ret = DIRENT_CHANGED;
+ }
+
+ /*
+ * If the directory entry is used, see if we can split the
+ * directory entry to make room for the new name. If so,
+ * truncate it and return.
+ */
+ if (dirent->inode) {
+ min_rec_len = EXT2_DIR_REC_LEN(dirent->name_len & 0xFF);
+ if (dirent->rec_len < (min_rec_len + rec_len))
+ return ret;
+ rec_len = dirent->rec_len - min_rec_len;
+ dirent->rec_len = min_rec_len;
+ next = (struct ext2_dir_entry *) (buf + offset +
+ dirent->rec_len);
+ next->inode = 0;
+ next->name_len = 0;
+ next->rec_len = rec_len;
+ return DIRENT_CHANGED;
+ }
+
+ /*
+ * If we get this far, then the directory entry is not used.
+ * See if we can fit the request entry in. If so, do it.
+ */
+ if (dirent->rec_len < rec_len)
+ return ret;
+ dirent->inode = ls->inode;
+ dirent->name_len = ls->namelen;
+ strncpy(dirent->name, ls->name, ls->namelen);
+ if (ls->sb->s_feature_incompat & EXT2_FEATURE_INCOMPAT_FILETYPE)
+ dirent->name_len |= (ls->flags & 0x7) << 8;
+
+ ls->done++;
+ return DIRENT_ABORT|DIRENT_CHANGED;
+}
+
+/*
+ * Note: the low 3 bits of the flags field are used as the directory
+ * entry filetype.
+ */
+#ifdef __TURBOC__
+# pragma argsused
+#endif
+errcode_t ext2fs_link(ext2_filsys fs, ext2_ino_t dir, const char *name,
+ ext2_ino_t ino, int flags)
+{
+ errcode_t retval;
+ struct link_struct ls;
+ struct ext2_inode inode;
+
+ EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
+
+ if (!(fs->flags & EXT2_FLAG_RW))
+ return EXT2_ET_RO_FILSYS;
+
+ ls.name = name;
+ ls.namelen = name ? strlen(name) : 0;
+ ls.inode = ino;
+ ls.flags = flags;
+ ls.done = 0;
+ ls.sb = fs->super;
+
+ retval = ext2fs_dir_iterate(fs, dir, DIRENT_FLAG_INCLUDE_EMPTY,
+ 0, link_proc, &ls);
+ if (retval)
+ return retval;
+
+ if (!ls.done)
+ return EXT2_ET_DIR_NO_SPACE;
+
+ if ((retval = ext2fs_read_inode(fs, dir, &inode)) != 0)
+ return retval;
+
+ if (inode.i_flags & EXT2_INDEX_FL) {
+ inode.i_flags &= ~EXT2_INDEX_FL;
+ if ((retval = ext2fs_write_inode(fs, dir, &inode)) != 0)
+ return retval;
+ }
+
+ return 0;
+}