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-rw-r--r--lib/ext2fs/bmove.c167
1 files changed, 167 insertions, 0 deletions
diff --git a/lib/ext2fs/bmove.c b/lib/ext2fs/bmove.c
new file mode 100644
index 0000000..e2ea405
--- /dev/null
+++ b/lib/ext2fs/bmove.c
@@ -0,0 +1,167 @@
+/*
+ * bmove.c --- Move blocks around to make way for a particular
+ * filesystem structure.
+ *
+ * Copyright (C) 1997 Theodore Ts'o.
+ *
+ * %Begin-Header%
+ * This file may be redistributed under the terms of the GNU Library
+ * General Public License, version 2.
+ * %End-Header%
+ */
+
+#include "config.h"
+#include <stdio.h>
+#include <string.h>
+#if HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+#if HAVE_SYS_TYPES_H
+#include <sys/types.h>
+#endif
+#if HAVE_SYS_TIME_H
+#include <sys/time.h>
+#endif
+
+#include "ext2_fs.h"
+#include "ext2fsP.h"
+
+struct process_block_struct {
+ ext2_ino_t ino;
+ struct ext2_inode * inode;
+ ext2fs_block_bitmap reserve;
+ ext2fs_block_bitmap alloc_map;
+ errcode_t error;
+ char *buf;
+ int add_dir;
+ int flags;
+};
+
+static int process_block(ext2_filsys fs, blk64_t *block_nr,
+ e2_blkcnt_t blockcnt, blk64_t ref_block,
+ int ref_offset, void *priv_data)
+{
+ struct process_block_struct *pb;
+ errcode_t retval;
+ int ret;
+ blk64_t block, orig;
+
+ pb = (struct process_block_struct *) priv_data;
+ block = orig = *block_nr;
+ ret = 0;
+
+ /*
+ * Let's see if this is one which we need to relocate
+ */
+ if (ext2fs_test_block_bitmap2(pb->reserve, block)) {
+ do {
+ if (++block >= ext2fs_blocks_count(fs->super))
+ block = fs->super->s_first_data_block;
+ if (block == orig) {
+ pb->error = EXT2_ET_BLOCK_ALLOC_FAIL;
+ return BLOCK_ABORT;
+ }
+ } while (ext2fs_test_block_bitmap2(pb->reserve, block) ||
+ ext2fs_test_block_bitmap2(pb->alloc_map, block));
+
+ retval = io_channel_read_blk64(fs->io, orig, 1, pb->buf);
+ if (retval) {
+ pb->error = retval;
+ return BLOCK_ABORT;
+ }
+ retval = io_channel_write_blk64(fs->io, block, 1, pb->buf);
+ if (retval) {
+ pb->error = retval;
+ return BLOCK_ABORT;
+ }
+ *block_nr = block;
+ ext2fs_mark_block_bitmap2(pb->alloc_map, block);
+ ret = BLOCK_CHANGED;
+ if (pb->flags & EXT2_BMOVE_DEBUG)
+ printf("ino=%u, blockcnt=%lld, %llu->%llu\n",
+ (unsigned) pb->ino, blockcnt,
+ (unsigned long long) orig,
+ (unsigned long long) block);
+ }
+ if (pb->add_dir) {
+ retval = ext2fs_add_dir_block2(fs->dblist, pb->ino,
+ block, blockcnt);
+ if (retval) {
+ pb->error = retval;
+ ret |= BLOCK_ABORT;
+ }
+ }
+ return ret;
+}
+
+errcode_t ext2fs_move_blocks(ext2_filsys fs,
+ ext2fs_block_bitmap reserve,
+ ext2fs_block_bitmap alloc_map,
+ int flags)
+{
+ ext2_ino_t ino;
+ struct ext2_inode inode;
+ errcode_t retval;
+ struct process_block_struct pb;
+ ext2_inode_scan scan;
+ char *block_buf;
+
+ retval = ext2fs_open_inode_scan(fs, 0, &scan);
+ if (retval)
+ return retval;
+
+ pb.reserve = reserve;
+ pb.error = 0;
+ pb.alloc_map = alloc_map ? alloc_map : fs->block_map;
+ pb.flags = flags;
+
+ retval = ext2fs_get_array(4, fs->blocksize, &block_buf);
+ if (retval)
+ return retval;
+ pb.buf = block_buf + fs->blocksize * 3;
+
+ /*
+ * If GET_DBLIST is set in the flags field, then we should
+ * gather directory block information while we're doing the
+ * block move.
+ */
+ if (flags & EXT2_BMOVE_GET_DBLIST) {
+ if (fs->dblist) {
+ ext2fs_free_dblist(fs->dblist);
+ fs->dblist = NULL;
+ }
+ retval = ext2fs_init_dblist(fs, 0);
+ if (retval)
+ return retval;
+ }
+
+ retval = ext2fs_get_next_inode(scan, &ino, &inode);
+ if (retval)
+ return retval;
+
+ while (ino) {
+ if ((inode.i_links_count == 0) ||
+ !ext2fs_inode_has_valid_blocks2(fs, &inode))
+ goto next;
+
+ pb.ino = ino;
+ pb.inode = &inode;
+
+ pb.add_dir = (LINUX_S_ISDIR(inode.i_mode) &&
+ flags & EXT2_BMOVE_GET_DBLIST);
+
+ retval = ext2fs_block_iterate3(fs, ino, 0, block_buf,
+ process_block, &pb);
+ if (retval)
+ return retval;
+ if (pb.error)
+ return pb.error;
+
+ next:
+ retval = ext2fs_get_next_inode(scan, &ino, &inode);
+ if (retval == EXT2_ET_BAD_BLOCK_IN_INODE_TABLE)
+ goto next;
+ }
+ return 0;
+}
+