Adding upstream version 1.47.0.upstream/1.47.0

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 302 insertions, 0 deletions

diff --git a/e2fsck/pass4.c b/e2fsck/pass4.c
new file mode 100644
index 0000000..d2dda02
--- /dev/null
+++ b/e2fsck/pass4.c
@@ -0,0 +1,302 @@
+/*
+ * 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);
+}
+