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Message-ID: <20110901003700.1176.54308.stgit@elm3c44.beaverton.ibm.com>
Date: Wed, 31 Aug 2011 17:37:00 -0700
From: "Darrick J. Wong" <djwong@...ibm.com>
To: Andreas Dilger <adilger.kernel@...ger.ca>,
Theodore Tso <tytso@....edu>,
"Darrick J. Wong" <djwong@...ibm.com>
Cc: Sunil Mushran <sunil.mushran@...cle.com>,
Amir Goldstein <amir73il@...il.com>,
Andi Kleen <andi@...stfloor.org>,
Mingming Cao <cmm@...ibm.com>,
Joel Becker <jlbec@...lplan.org>, linux-ext4@...r.kernel.org,
Coly Li <colyli@...il.com>
Subject: [PATCH 17/37] e2fsck: Verify block bitmap checksum
Check block bitmap checksum and write a new checksum if the verification fails.
This is ok because e2fsck has already computed the correct block bitmap.
Signed-off-by: Darrick J. Wong <djwong@...ibm.com>
---
e2fsck/pass5.c | 60 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
e2fsck/problem.c | 5 +++++
e2fsck/problem.h | 3 +++
3 files changed, 68 insertions(+), 0 deletions(-)
diff --git a/e2fsck/pass5.c b/e2fsck/pass5.c
index a0cc564..63b7e99 100644
--- a/e2fsck/pass5.c
+++ b/e2fsck/pass5.c
@@ -27,6 +27,7 @@ static void check_inode_bitmaps(e2fsck_t ctx);
static void check_inode_end(e2fsck_t ctx);
static void check_block_end(e2fsck_t ctx);
static void check_inode_bitmap_checksum(e2fsck_t ctx);
+static void check_block_bitmap_checksum(e2fsck_t ctx);
void e2fsck_pass5(e2fsck_t ctx)
{
@@ -67,6 +68,7 @@ void e2fsck_pass5(e2fsck_t ctx)
return;
check_inode_bitmap_checksum(ctx);
+ check_block_bitmap_checksum(ctx);
ext2fs_free_inode_bitmap(ctx->inode_used_map);
ctx->inode_used_map = 0;
@@ -134,6 +136,64 @@ static void check_inode_bitmap_checksum(e2fsck_t ctx)
ext2fs_free_mem(&buf);
}
+static void check_block_bitmap_checksum(e2fsck_t ctx)
+{
+ struct problem_context pctx;
+ struct ext4_group_desc *gdp;
+ char *buf;
+ dgrp_t i;
+ int nbytes;
+ blk64_t blk_itr;
+ errcode_t retval;
+ int csum_flag = 0;
+
+ /* If bitmap is dirty from being fixed, checksum will be corrected */
+ if (ext2fs_test_bb_dirty(ctx->fs))
+ return;
+
+ nbytes = (size_t)((EXT2_BLOCKS_PER_GROUP(ctx->fs->super) + 7) / 8);
+ retval = ext2fs_get_memalign(ctx->fs->blocksize, ctx->fs->blocksize,
+ &buf);
+ if (retval)
+ return;
+
+ if (EXT2_HAS_RO_COMPAT_FEATURE(ctx->fs->super,
+ EXT4_FEATURE_RO_COMPAT_GDT_CSUM))
+ csum_flag = 1;
+
+ clear_problem_context(&pctx);
+ for (i = 0; i < ctx->fs->group_desc_count; i++) {
+ if (csum_flag && ext2fs_bg_flags_test(ctx->fs, i,
+ EXT2_BG_BLOCK_UNINIT))
+ continue;
+
+ blk_itr = EXT2FS_B2C(ctx->fs,
+ ctx->fs->super->s_first_data_block) +
+ (i * (nbytes << 3));
+ gdp = (struct ext4_group_desc *)ext2fs_group_desc(ctx->fs,
+ ctx->fs->group_desc, i);
+ retval = ext2fs_get_block_bitmap_range2(ctx->fs->block_map,
+ blk_itr, nbytes << 3,
+ buf);
+ if (retval)
+ break;
+
+ if (ext2fs_bitmap_csum_verify(ctx->fs, i,
+ gdp->bg_block_bitmap_csum, buf,
+ nbytes))
+ continue;
+ pctx.group = i;
+ if (!fix_problem(ctx, PR_5_BLOCK_BITMAP_CSUM_INVALID, &pctx))
+ continue;
+
+ /* Fixing one checksum will rewrite all of them */
+ ext2fs_mark_bb_dirty(ctx->fs);
+ break;
+ }
+
+ ext2fs_free_mem(&buf);
+}
+
static void e2fsck_discard_blocks(e2fsck_t ctx, io_manager manager,
blk64_t start, blk64_t count)
{
diff --git a/e2fsck/problem.c b/e2fsck/problem.c
index 35a8055..9629b9e 100644
--- a/e2fsck/problem.c
+++ b/e2fsck/problem.c
@@ -1664,6 +1664,11 @@ static struct e2fsck_problem problem_table[] = {
N_("@g %g @i bitmap does not match checksum\n"),
PROMPT_FIX, PR_LATCH_IBITMAP | PR_PREEN_OK },
+ /* Group N block bitmap does not match checksum */
+ { PR_5_BLOCK_BITMAP_CSUM_INVALID,
+ N_("@g %g @b bitmap does not match checksum\n"),
+ PROMPT_FIX, PR_LATCH_BBITMAP | PR_PREEN_OK },
+
/* Post-Pass 5 errors */
/* Recreate journal if E2F_FLAG_JOURNAL_INODE flag is set */
diff --git a/e2fsck/problem.h b/e2fsck/problem.h
index 9766113..8cc461b 100644
--- a/e2fsck/problem.h
+++ b/e2fsck/problem.h
@@ -1004,6 +1004,9 @@ struct problem_context {
/* Inode bitmap checksum does not match */
#define PR_5_INODE_BITMAP_CSUM_INVALID 0x05001A
+/* Block bitmap checksum does not match */
+#define PR_5_BLOCK_BITMAP_CSUM_INVALID 0x05001B
+
/*
* Post-Pass 5 errors
*/
--
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