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https://git.kernel.org/pub/scm/fs/ext2/e2fsprogs.git
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140 lines
3.6 KiB
C
140 lines
3.6 KiB
C
/*
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* pass4.c -- pass #4 of e2fsck: Check reference counts
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*
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* Copyright (C) 1993, 1994, 1995, 1996, 1997 Theodore Ts'o.
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*
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* %Begin-Header%
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* This file may be redistributed under the terms of the GNU Public
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* License.
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* %End-Header%
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*
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* Pass 4 frees the following data structures:
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* - A bitmap of which inodes are in bad blocks. (inode_bb_map)
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*/
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#include "e2fsck.h"
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#include "problem.h"
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/*
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* This routine is called when an inode is not connected to the
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* directory tree.
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*
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* This subroutine returns 1 then the caller shouldn't bother with the
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* rest of the pass 4 tests.
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*/
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static int disconnect_inode(ext2_filsys fs, ino_t i)
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{
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struct ext2_inode inode;
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struct problem_context pctx;
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e2fsck_read_inode(fs, i, &inode, "pass4: disconnect_inode");
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clear_problem_context(&pctx);
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pctx.ino = i;
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pctx.inode = &inode;
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if (!inode.i_blocks && (LINUX_S_ISREG(inode.i_mode) ||
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LINUX_S_ISDIR(inode.i_mode))) {
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/*
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* This is a zero-length file; prompt to delete it...
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*/
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if (fix_problem(fs, PR_4_ZERO_LEN_INODE, &pctx)) {
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ext2fs_icount_store(inode_link_info, i, 0);
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inode.i_links_count = 0;
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inode.i_dtime = time(0);
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e2fsck_write_inode(fs, i, &inode,
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"disconnect_inode");
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/*
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* Fix up the bitmaps...
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*/
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read_bitmaps(fs);
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ext2fs_unmark_inode_bitmap(inode_used_map, i);
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ext2fs_unmark_inode_bitmap(inode_dir_map, i);
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ext2fs_unmark_inode_bitmap(fs->inode_map, i);
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ext2fs_mark_ib_dirty(fs);
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return 0;
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}
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}
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/*
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* Prompt to reconnect.
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*/
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if (fix_problem(fs, PR_4_UNATTACHED_INODE, &pctx)) {
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if (reconnect_file(fs, i))
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ext2fs_unmark_valid(fs);
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} else {
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/*
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* If we don't attach the inode, then skip the
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* i_links_test since there's no point in trying to
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* force i_links_count to zero.
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*/
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ext2fs_unmark_valid(fs);
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return 1;
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}
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return 0;
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}
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void pass4(ext2_filsys fs)
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{
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ino_t i;
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struct ext2_inode inode;
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struct resource_track rtrack;
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struct problem_context pctx;
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__u16 link_count, link_counted;
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init_resource_track(&rtrack);
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#ifdef MTRACE
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mtrace_print("Pass 4");
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#endif
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if (!preen)
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printf("Pass 4: Checking reference counts\n");
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clear_problem_context(&pctx);
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for (i=1; i <= fs->super->s_inodes_count; i++) {
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if (i == EXT2_BAD_INO ||
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(i > EXT2_ROOT_INO && i < EXT2_FIRST_INODE(fs->super)))
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continue;
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if (!(ext2fs_test_inode_bitmap(inode_used_map, i)) ||
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(inode_bb_map &&
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ext2fs_test_inode_bitmap(inode_bb_map, i)))
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continue;
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ext2fs_icount_fetch(inode_link_info, i, &link_count);
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ext2fs_icount_fetch(inode_count, i, &link_counted);
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if (link_counted == 0) {
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if (disconnect_inode(fs, i))
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continue;
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ext2fs_icount_fetch(inode_link_info, i, &link_count);
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ext2fs_icount_fetch(inode_count, i, &link_counted);
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}
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if (link_counted != link_count) {
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e2fsck_read_inode(fs, i, &inode, "pass4");
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pctx.ino = i;
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pctx.inode = &inode;
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if (link_count != inode.i_links_count) {
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printf("WARNING: PROGRAMMING BUG IN E2FSCK!\n");
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printf("\tOR SOME BONEHEAD (YOU) IS CHECKING "
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"A MOUNTED (LIVE) FILESYSTEM.\n");
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printf("inode_link_info[%ld] is %u, "
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"inode.i_links_count is %d. "
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"They should be the same!\n",
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i, link_count,
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inode.i_links_count);
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}
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pctx.num = link_counted;
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if (fix_problem(fs, PR_4_BAD_REF_COUNT, &pctx)) {
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inode.i_links_count = link_counted;
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e2fsck_write_inode(fs, i, &inode, "pass4");
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}
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}
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}
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ext2fs_free_icount(inode_link_info); inode_link_info = 0;
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ext2fs_free_icount(inode_count); inode_count = 0;
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ext2fs_free_inode_bitmap(inode_bb_map);
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if (tflag > 1) {
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printf("Pass 4: ");
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print_resource_track(&rtrack);
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}
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}
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