| /* |
| * pass4.c -- pass #4 of e2fsck: Check reference counts |
| * |
| * Copyright (C) 1993, 1994, 1995, 1996, 1997 Theodore Ts'o. |
| * |
| * %Begin-Header% |
| * This file may be redistributed under the terms of the GNU Public |
| * License. |
| * %End-Header% |
| * |
| * Pass 4 frees the following data structures: |
| * - A bitmap of which inodes are in bad blocks. (inode_bb_map) |
| */ |
| |
| #include "e2fsck.h" |
| #include "problem.h" |
| |
| /* |
| * This routine is called when an inode is not connected to the |
| * directory tree. |
| * |
| * This subroutine returns 1 then the caller shouldn't bother with the |
| * rest of the pass 4 tests. |
| */ |
| static int disconnect_inode(e2fsck_t ctx, ino_t i) |
| { |
| ext2_filsys fs = ctx->fs; |
| struct ext2_inode inode; |
| struct problem_context pctx; |
| |
| e2fsck_read_inode(fs, i, &inode, "pass4: disconnect_inode"); |
| clear_problem_context(&pctx); |
| pctx.ino = i; |
| pctx.inode = &inode; |
| |
| if (!inode.i_blocks && (LINUX_S_ISREG(inode.i_mode) || |
| LINUX_S_ISDIR(inode.i_mode))) { |
| /* |
| * This is a zero-length file; prompt to delete it... |
| */ |
| if (fix_problem(ctx, PR_4_ZERO_LEN_INODE, &pctx)) { |
| ext2fs_icount_store(ctx->inode_link_info, i, 0); |
| inode.i_links_count = 0; |
| inode.i_dtime = time(0); |
| e2fsck_write_inode(fs, i, &inode, |
| "disconnect_inode"); |
| /* |
| * Fix up the bitmaps... |
| */ |
| read_bitmaps(ctx); |
| ext2fs_unmark_inode_bitmap(ctx->inode_used_map, i); |
| ext2fs_unmark_inode_bitmap(ctx->inode_dir_map, i); |
| ext2fs_unmark_inode_bitmap(fs->inode_map, i); |
| ext2fs_mark_ib_dirty(fs); |
| return 0; |
| } |
| } |
| |
| /* |
| * Prompt to reconnect. |
| */ |
| if (fix_problem(ctx, PR_4_UNATTACHED_INODE, &pctx)) { |
| if (reconnect_file(ctx, i)) |
| ext2fs_unmark_valid(fs); |
| } else { |
| /* |
| * If we don't attach the inode, then skip the |
| * i_links_test since there's no point in trying to |
| * force i_links_count to zero. |
| */ |
| ext2fs_unmark_valid(fs); |
| return 1; |
| } |
| return 0; |
| } |
| |
| |
| void pass4(e2fsck_t ctx) |
| { |
| ext2_filsys fs = ctx->fs; |
| ino_t i; |
| struct ext2_inode inode; |
| #ifdef RESOURCE_TRACK |
| struct resource_track rtrack; |
| #endif |
| struct problem_context pctx; |
| __u16 link_count, link_counted; |
| |
| #ifdef RESOURCE_TRACK |
| init_resource_track(&rtrack); |
| #endif |
| |
| #ifdef MTRACE |
| mtrace_print("Pass 4"); |
| #endif |
| |
| clear_problem_context(&pctx); |
| |
| if (!(ctx->options & E2F_OPT_PREEN)) |
| fix_problem(ctx, PR_4_PASS_HEADER, &pctx); |
| |
| for (i=1; i <= fs->super->s_inodes_count; i++) { |
| if (i == EXT2_BAD_INO || |
| (i > EXT2_ROOT_INO && i < EXT2_FIRST_INODE(fs->super))) |
| continue; |
| if (!(ext2fs_test_inode_bitmap(ctx->inode_used_map, i)) || |
| (ctx->inode_bb_map && |
| ext2fs_test_inode_bitmap(ctx->inode_bb_map, i))) |
| continue; |
| ext2fs_icount_fetch(ctx->inode_link_info, i, &link_count); |
| ext2fs_icount_fetch(ctx->inode_count, i, &link_counted); |
| if (link_counted == 0) { |
| if (disconnect_inode(ctx, i)) |
| continue; |
| ext2fs_icount_fetch(ctx->inode_link_info, i, |
| &link_count); |
| ext2fs_icount_fetch(ctx->inode_count, i, |
| &link_counted); |
| } |
| if (link_counted != link_count) { |
| e2fsck_read_inode(fs, i, &inode, "pass4"); |
| pctx.ino = i; |
| pctx.inode = &inode; |
| if (link_count != inode.i_links_count) { |
| pctx.num = link_count; |
| fix_problem(ctx, |
| PR_4_INCONSISTENT_COUNT, &pctx); |
| } |
| pctx.num = link_counted; |
| if (fix_problem(ctx, PR_4_BAD_REF_COUNT, &pctx)) { |
| inode.i_links_count = link_counted; |
| e2fsck_write_inode(fs, i, &inode, "pass4"); |
| } |
| } |
| } |
| ext2fs_free_icount(ctx->inode_link_info); ctx->inode_link_info = 0; |
| ext2fs_free_icount(ctx->inode_count); ctx->inode_count = 0; |
| ext2fs_free_inode_bitmap(ctx->inode_bb_map); |
| ctx->inode_bb_map = 0; |
| #ifdef RESOURCE_TRACK |
| if (ctx->options & E2F_OPT_TIME2) |
| print_resource_track("Pass 4", &rtrack); |
| #endif |
| } |
| |