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-rw-r--r--e2fsck/pass4.c302
1 files changed, 302 insertions, 0 deletions
diff --git a/e2fsck/pass4.c b/e2fsck/pass4.c
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+++ b/e2fsck/pass4.c
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+/*
+ * 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)
+ * - A bitmap of which inodes are imagic inodes. (inode_imagic_map)
+ * - Ref counts for ea_inodes. (ea_inode_refs)
+ */
+
+#include "config.h"
+#include "e2fsck.h"
+#include "problem.h"
+#include <ext2fs/ext2_ext_attr.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, ext2_ino_t i, ext2_ino_t *last_ino,
+ struct ext2_inode_large *inode)
+{
+ ext2_filsys fs = ctx->fs;
+ struct problem_context pctx;
+ __u32 eamagic = 0;
+ int extra_size = 0;
+
+ if (*last_ino != i) {
+ e2fsck_read_inode_full(ctx, i, EXT2_INODE(inode),
+ EXT2_INODE_SIZE(fs->super),
+ "pass4: disconnect_inode");
+ *last_ino = i;
+ }
+ if (EXT2_INODE_SIZE(fs->super) > EXT2_GOOD_OLD_INODE_SIZE)
+ extra_size = inode->i_extra_isize;
+
+ clear_problem_context(&pctx);
+ pctx.ino = i;
+ pctx.inode = EXT2_INODE(inode);
+
+ if (EXT2_INODE_SIZE(fs->super) -EXT2_GOOD_OLD_INODE_SIZE -extra_size >0)
+ eamagic = *(__u32 *)(((char *)inode) +EXT2_GOOD_OLD_INODE_SIZE +
+ extra_size);
+ /*
+ * Offer to delete any zero-length files that does not have
+ * blocks. If there is an EA block, it might have useful
+ * information, so we won't prompt to delete it, but let it be
+ * reconnected to lost+found.
+ */
+ if (!inode->i_blocks && eamagic != EXT2_EXT_ATTR_MAGIC &&
+ (LINUX_S_ISREG(inode->i_mode) || LINUX_S_ISDIR(inode->i_mode))) {
+ if (fix_problem(ctx, PR_4_ZERO_LEN_INODE, &pctx)) {
+ e2fsck_clear_inode(ctx, i, EXT2_INODE(inode), 0,
+ "disconnect_inode");
+ /*
+ * Fix up the bitmaps...
+ */
+ e2fsck_read_bitmaps(ctx);
+ ext2fs_inode_alloc_stats2(fs, i, -1,
+ LINUX_S_ISDIR(inode->i_mode));
+ quota_data_inodes(ctx->qctx, inode, i, -1);
+ return 0;
+ }
+ }
+
+ /*
+ * Prompt to reconnect.
+ */
+ if (fix_problem(ctx, PR_4_UNATTACHED_INODE, &pctx)) {
+ if (e2fsck_reconnect_file(ctx, i))
+ ext2fs_unmark_valid(fs);
+ *last_ino = 0;
+ } 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;
+}
+
+/*
+ * This function is called when link_counted is zero. So this may not be
+ * an xattr inode at all. Return immediately if EA_INODE flag is not set.
+ */
+static void check_ea_inode(e2fsck_t ctx, ext2_ino_t i, ext2_ino_t *last_ino,
+ struct ext2_inode_large *inode, __u16 *link_counted)
+{
+ __u64 actual_refs = 0;
+ __u64 ref_count;
+
+ if (*last_ino != i) {
+ e2fsck_read_inode_full(ctx, i, EXT2_INODE(inode),
+ EXT2_INODE_SIZE(ctx->fs->super),
+ "pass4: check_ea_inode");
+ *last_ino = i;
+ }
+ if (!(inode->i_flags & EXT4_EA_INODE_FL))
+ return;
+
+ if (ctx->ea_inode_refs)
+ ea_refcount_fetch(ctx->ea_inode_refs, i, &actual_refs);
+ if (!actual_refs)
+ return;
+
+ /*
+ * There are some attribute references, link_counted is now considered
+ * to be 1.
+ */
+ *link_counted = 1;
+
+ ref_count = ext2fs_get_ea_inode_ref(EXT2_INODE(inode));
+
+ /* Old Lustre-style xattr inodes do not have a stored refcount.
+ * However, their i_ctime and i_atime should be the same.
+ */
+ if (ref_count != actual_refs && inode->i_ctime != inode->i_atime) {
+ struct problem_context pctx;
+
+ clear_problem_context(&pctx);
+ pctx.ino = i;
+ pctx.num = ref_count;
+ pctx.num2 = actual_refs;
+ if (fix_problem(ctx, PR_4_EA_INODE_REF_COUNT, &pctx)) {
+ ext2fs_set_ea_inode_ref(EXT2_INODE(inode), actual_refs);
+ e2fsck_write_inode(ctx, i, EXT2_INODE(inode), "pass4");
+ }
+ }
+}
+
+void e2fsck_pass4(e2fsck_t ctx)
+{
+ ext2_filsys fs = ctx->fs;
+ ext2_ino_t i;
+ struct ext2_inode_large *inode;
+ int inode_size = EXT2_INODE_SIZE(fs->super);
+#ifdef RESOURCE_TRACK
+ struct resource_track rtrack;
+#endif
+ struct problem_context pctx;
+ __u16 link_count, link_counted;
+ int dir_nlink_fs;
+ char *buf = 0;
+ dgrp_t group, maxgroup;
+
+ init_resource_track(&rtrack, ctx->fs->io);
+
+#ifdef MTRACE
+ mtrace_print("Pass 4");
+#endif
+ /*
+ * Since pass4 is mostly CPU bound, start readahead of bitmaps
+ * ahead of pass 5 if we haven't already loaded them.
+ */
+ if (ctx->readahead_kb &&
+ (fs->block_map == NULL || fs->inode_map == NULL))
+ e2fsck_readahead(fs, E2FSCK_READA_BBITMAP |
+ E2FSCK_READA_IBITMAP,
+ 0, fs->group_desc_count);
+
+ clear_problem_context(&pctx);
+
+ if (!(ctx->options & E2F_OPT_PREEN))
+ fix_problem(ctx, PR_4_PASS_HEADER, &pctx);
+
+ dir_nlink_fs = ext2fs_has_feature_dir_nlink(fs->super);
+
+ group = 0;
+ maxgroup = fs->group_desc_count;
+ if (ctx->progress)
+ if ((ctx->progress)(ctx, 4, 0, maxgroup))
+ return;
+
+ inode = e2fsck_allocate_memory(ctx, inode_size, "scratch inode");
+
+ /* Protect loop from wrap-around if s_inodes_count maxed */
+ for (i = 1; i <= fs->super->s_inodes_count && i > 0; i++) {
+ ext2_ino_t last_ino = 0;
+ int isdir;
+
+ if (ctx->flags & E2F_FLAG_SIGNAL_MASK)
+ goto errout;
+ if ((i % fs->super->s_inodes_per_group) == 0) {
+ group++;
+ if (ctx->progress)
+ if ((ctx->progress)(ctx, 4, group, maxgroup))
+ goto errout;
+ }
+ if (i == quota_type2inum(PRJQUOTA, ctx->fs->super) ||
+ i == fs->super->s_orphan_file_inum || i == EXT2_BAD_INO ||
+ (i > EXT2_ROOT_INO && i < EXT2_FIRST_INODE(fs->super)))
+ continue;
+ if (!(ext2fs_test_inode_bitmap2(ctx->inode_used_map, i)) ||
+ (ctx->inode_imagic_map &&
+ ext2fs_test_inode_bitmap2(ctx->inode_imagic_map, i)) ||
+ (ctx->inode_bb_map &&
+ ext2fs_test_inode_bitmap2(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) {
+ /*
+ * link_counted is expected to be 0 for an ea_inode.
+ * check_ea_inode() will update link_counted if
+ * necessary.
+ */
+ check_ea_inode(ctx, i, &last_ino, inode, &link_counted);
+ }
+
+ if (link_counted == 0) {
+ if (!buf)
+ buf = e2fsck_allocate_memory(ctx,
+ fs->blocksize, "bad_inode buffer");
+ if (e2fsck_process_bad_inode(ctx, 0, i, buf))
+ continue;
+ if (disconnect_inode(ctx, i, &last_ino, inode))
+ continue;
+ ext2fs_icount_fetch(ctx->inode_link_info, i,
+ &link_count);
+ ext2fs_icount_fetch(ctx->inode_count, i,
+ &link_counted);
+ }
+ isdir = ext2fs_test_inode_bitmap2(ctx->inode_dir_map, i);
+ if (isdir && (link_counted > EXT2_LINK_MAX)) {
+ if (!dir_nlink_fs &&
+ fix_problem(ctx, PR_4_DIR_NLINK_FEATURE, &pctx)) {
+ ext2fs_set_feature_dir_nlink(fs->super);
+ ext2fs_mark_super_dirty(fs);
+ dir_nlink_fs = 1;
+ }
+ link_counted = 1;
+ }
+ if (link_counted != link_count) {
+ int fix_nlink = 0;
+
+ if (last_ino != i) {
+ e2fsck_read_inode_full(ctx, i,
+ EXT2_INODE(inode),
+ inode_size, "pass4");
+ last_ino = i;
+ }
+ pctx.ino = i;
+ pctx.inode = EXT2_INODE(inode);
+ if ((link_count != inode->i_links_count) && !isdir &&
+ (inode->i_links_count <= EXT2_LINK_MAX)) {
+ pctx.num = link_count;
+ fix_problem(ctx,
+ PR_4_INCONSISTENT_COUNT, &pctx);
+ }
+ pctx.num = link_counted;
+ /* i_link_count was previously exceeded, but no longer
+ * is, fix this but don't consider it an error */
+ if (isdir && link_counted > 1 &&
+ (inode->i_flags & EXT2_INDEX_FL) &&
+ link_count == 1) {
+ if ((ctx->options & E2F_OPT_READONLY) == 0) {
+ fix_nlink =
+ fix_problem(ctx,
+ PR_4_DIR_OVERFLOW_REF_COUNT,
+ &pctx);
+ }
+ } else {
+ fix_nlink = fix_problem(ctx, PR_4_BAD_REF_COUNT,
+ &pctx);
+ }
+ if (fix_nlink) {
+ inode->i_links_count = link_counted;
+ e2fsck_write_inode_full(ctx, i,
+ EXT2_INODE(inode),
+ inode_size, "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;
+ ea_refcount_free(ctx->ea_inode_refs);
+ ctx->ea_inode_refs = 0;
+ ext2fs_free_inode_bitmap(ctx->inode_imagic_map);
+ ctx->inode_imagic_map = 0;
+errout:
+ if (buf)
+ ext2fs_free_mem(&buf);
+
+ ext2fs_free_mem(&inode);
+ print_resource_track(ctx, _("Pass 4"), &rtrack, ctx->fs->io);
+}
+
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