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Date: Tue, 06 Mar 2012 15:58:12 -0800
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 08/54] e2fsck: Verify and correct inode checksums
Detect mismatches of the inode and checksum, and prompt the user to fix the
situation.
Signed-off-by: Darrick J. Wong <djwong@...ibm.com>
---
e2fsck/pass1.c | 60 +++++++++++++++++++++++++++++++++++++++++++++++++++++-
e2fsck/problem.c | 10 +++++++++
e2fsck/problem.h | 6 +++++
3 files changed, 75 insertions(+), 1 deletions(-)
diff --git a/e2fsck/pass1.c b/e2fsck/pass1.c
index c31e073..471e3e0 100644
--- a/e2fsck/pass1.c
+++ b/e2fsck/pass1.c
@@ -540,6 +540,40 @@ extern void e2fsck_setup_tdb_icount(e2fsck_t ctx, int flags,
*ret = 0;
}
+static errcode_t recheck_bad_inode_checksum(ext2_filsys fs, ext2_ino_t ino,
+ e2fsck_t ctx,
+ struct problem_context *pctx)
+{
+ errcode_t retval;
+ struct ext2_inode_large inode;
+
+ /*
+ * Reread inode. If we don't see checksum error, then this inode
+ * has been fixed elsewhere.
+ */
+ retval = ext2fs_read_inode_full(fs, ino, (struct ext2_inode *)&inode,
+ sizeof(inode));
+ if (retval && retval != EXT2_ET_INODE_CSUM_INVALID)
+ return retval;
+ if (!retval)
+ return 0;
+
+ /*
+ * Checksum still doesn't match. That implies that the inode passes
+ * all the sanity checks, so maybe the checksum is simply corrupt.
+ * See if the user will go for fixing that.
+ */
+ if (!fix_problem(ctx, PR_1_INODE_ONLY_CSUM_INVALID, pctx))
+ return 0;
+
+ retval = ext2fs_write_inode_full(fs, ino, (struct ext2_inode *)&inode,
+ sizeof(inode));
+ if (retval)
+ return retval;
+
+ return 0;
+}
+
void e2fsck_pass1(e2fsck_t ctx)
{
int i;
@@ -561,6 +595,7 @@ void e2fsck_pass1(e2fsck_t ctx)
int imagic_fs, extent_fs;
int busted_fs_time = 0;
int inode_size;
+ int failed_csum = 0;
init_resource_track(&rtrack, ctx->fs->io);
clear_problem_context(&pctx);
@@ -740,7 +775,8 @@ void e2fsck_pass1(e2fsck_t ctx)
ext2fs_mark_inode_bitmap2(ctx->inode_used_map, ino);
continue;
}
- if (pctx.errcode) {
+ if (pctx.errcode &&
+ pctx.errcode != EXT2_ET_INODE_CSUM_INVALID) {
fix_problem(ctx, PR_1_ISCAN_ERROR, &pctx);
ctx->flags |= E2F_FLAG_ABORT;
return;
@@ -750,6 +786,14 @@ void e2fsck_pass1(e2fsck_t ctx)
pctx.ino = ino;
pctx.inode = inode;
ctx->stashed_ino = ino;
+
+ /* Clear corrupt inode? */
+ if (pctx.errcode == EXT2_ET_INODE_CSUM_INVALID) {
+ if (fix_problem(ctx, PR_1_INODE_CSUM_INVALID, &pctx))
+ goto clear_inode;
+ failed_csum = 1;
+ }
+
if (inode->i_links_count) {
pctx.errcode = ext2fs_icount_store(ctx->inode_link_info,
ino, inode->i_links_count);
@@ -1146,6 +1190,20 @@ void e2fsck_pass1(e2fsck_t ctx)
} else
check_blocks(ctx, &pctx, block_buf);
+ /*
+ * If the inode failed the checksum and the user didn't
+ * clear the inode, test the checksum again -- if it still
+ * fails, ask the user if the checksum should be corrected.
+ */
+ if (failed_csum) {
+ pctx.errcode = recheck_bad_inode_checksum(fs, ino, ctx,
+ &pctx);
+ if (pctx.errcode) {
+ ctx->flags |= E2F_FLAG_ABORT;
+ return;
+ }
+ }
+
if (ctx->flags & E2F_FLAG_SIGNAL_MASK)
return;
diff --git a/e2fsck/problem.c b/e2fsck/problem.c
index 579c838..a6dd88a 100644
--- a/e2fsck/problem.c
+++ b/e2fsck/problem.c
@@ -929,8 +929,18 @@ static struct e2fsck_problem problem_table[] = {
/* Quota inode is user visible */
{ PR_1_QUOTA_INODE_NOT_HIDDEN,
N_("@q @i is visible to the user. "),
+ PROMPT_FIX, PR_PREEN_OK },
+
+ /* inode checksum does not match inode */
+ { PR_1_INODE_CSUM_INVALID,
+ N_("@i %i checksum does not match @i. "),
PROMPT_CLEAR, PR_PREEN_OK },
+ /* inode passes checks, but checksum does not match inode */
+ { PR_1_INODE_ONLY_CSUM_INVALID,
+ N_("@i %i passes checks, but checksum does not match @i. "),
+ PROMPT_FIX, PR_PREEN_OK },
+
/* Invalid bad inode */
{ PR_1_INVALID_BAD_INODE,
N_("The bad @b @i looks @n. "),
diff --git a/e2fsck/problem.h b/e2fsck/problem.h
index 3fabc90..5797fe2 100644
--- a/e2fsck/problem.h
+++ b/e2fsck/problem.h
@@ -550,6 +550,12 @@ struct problem_context {
/* Invalid bad inode */
#define PR_1_INVALID_BAD_INODE 0x010065
+/* inode checksum does not match inode */
+#define PR_1_INODE_CSUM_INVALID 0x010066
+
+/* inode passes checks, but checksum does not match inode */
+#define PR_1_INODE_ONLY_CSUM_INVALID 0x010067
+
/*
* Pass 1b errors
*/
--
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