linux-ext4 - [PATCH] e2fsck: journal-replay-only

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Date:	Sat, 13 Nov 2010 00:09:07 +0100
From:	Bernd Schubert <bs_lists@...ef.fastmail.fm>
To:	linux-ext4@...r.kernel.org
Subject: [PATCH] e2fsck: journal-replay-only

e2fsck: journal-replay-only

As recently discussed on linux-ext4@...r.kernel.org add an option to e2fsck
to allow to replay the journal only. That will allow scripts, such as 
pacemakers 'Filesystem' RA to first replay the journal and if that sets
an error state from the journal replay, further check for that error 
(dumpe2fh -h | grep "Filesystem state:") and if that shows and error
to refuse to mount. It also allows automatic e2fsck scripts to first
replay the journal and on a second run after the real pass1 to passX checks
to test for the return code.

Signed-off-by: Bernd Schubert <bschubert@....com>


diff --git a/e2fsck/e2fsck.8.in b/e2fsck/e2fsck.8.in
index 3fb15e6..d948f4c 100644
--- a/e2fsck/e2fsck.8.in
+++ b/e2fsck/e2fsck.8.in
@@ -186,6 +186,9 @@ Set the version of the extended attribute blocks which
 will require while checking the filesystem.  The version number may 
 be 1 or 2.  The default extended attribute version format is 2.
 .TP
+.BI journal_only
+Only replay the journal if required, but do not run any further repair action.
+.TP
 .BI fragcheck
 During pass 1, print a detailed report of any discontiguous blocks for
 files in the filesystem.
diff --git a/e2fsck/e2fsck.h b/e2fsck/e2fsck.h
index d4df5f3..d8038a5 100644
--- a/e2fsck/e2fsck.h
+++ b/e2fsck/e2fsck.h
@@ -155,6 +155,7 @@ struct resource_track {
 #define E2F_OPT_WRITECHECK	0x0200
 #define E2F_OPT_COMPRESS_DIRS	0x0400
 #define E2F_OPT_FRAGCHECK	0x0800
+#define E2F_OPT_JOURNAL_ONLY	0x1000 /* only replay the journal */
 
 /*
  * E2fsck flags
diff --git a/e2fsck/unix.c b/e2fsck/unix.c
index 7eb269c..e3fee9a 100644
--- a/e2fsck/unix.c
+++ b/e2fsck/unix.c
@@ -308,6 +308,10 @@ static void check_if_skip(e2fsck_t ctx)
 	if ((ctx->options & E2F_OPT_FORCE) || bad_blocks_file || cflag)
 		return;
 
+	if (ctx->options & E2F_OPT_JOURNAL_ONLY) {
+		goto skip;
+	}
+
 	lastcheck = fs->super->s_lastcheck;
 	if (lastcheck > ctx->now)
 		lastcheck -= ctx->time_fudge;
@@ -372,6 +376,7 @@ static void check_if_skip(e2fsck_t ctx)
 			printf(_(" (check in %ld mounts)"), next_check);
 	}
 	fputc('\n', stdout);
+skip:
 	ext2fs_close(fs);
 	ctx->fs = NULL;
 	e2fsck_free_context(ctx);
@@ -594,6 +599,13 @@ static void parse_extended_opts(e2fsck_t ctx, const char *opts)
 		} else if (strcmp(token, "fragcheck") == 0) {
 			ctx->options |= E2F_OPT_FRAGCHECK;
 			continue;
+
+		} else if (strcmp(token, "journal_only") == 0) {
+			if (arg) {
+				extended_usage++;
+				continue;
+			}
+			ctx->options |= E2F_OPT_JOURNAL_ONLY;
 		} else {
 			fprintf(stderr, _("Unknown extended option: %s\n"),
 				token);
@@ -609,6 +621,7 @@ static void parse_extended_opts(e2fsck_t ctx, const char *opts)
 		       "Valid extended options are:\n"), stderr);
 		fputs(("\tea_ver=<ea_version (1 or 2)>\n"), stderr);
 		fputs(("\tfragcheck\n"), stderr);
+		fputs(("\tjournal_only\n"), stderr);
 		fputc('\n', stderr);
 		exit(1);
 	}



-- 
Bernd Schubert
DataDirect Networks
--
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