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Date:   Fri, 19 Jun 2020 00:27:17 +0900
From:   Wang Shilong <wangshilong1991@...il.com>
To:     linux-ext4@...r.kernel.org
Cc:     lixi@....com, adilger@...ger.ca, wangshilong1991@...il.com,
        sihara@....com, Wang Shilong <wshilong@....com>
Subject: [RFC PATCH v2 14/51] e2fsck: add start/end group for thread

From: Li Xi <lixi@....com>

When multi-threads are used for check, each thread needs to jump
to different group in pass1 check. This patch adds the group
jumping support. But still, only one thread is used to check.

Signed-off-by: Li Xi <lixi@....com>
Signed-off-by: Wang Shilong <wshilong@....com>
---
 e2fsck/e2fsck.h           | 18 +++++++++++++--
 e2fsck/logfile.c          |  5 +++--
 e2fsck/pass1.c            | 46 +++++++++++++++++++++++++++++++++------
 e2fsck/problem.c          |  5 +++++
 e2fsck/problem.h          |  3 +++
 lib/ext2fs/ext2_err.et.in |  3 +++
 6 files changed, 69 insertions(+), 11 deletions(-)

diff --git a/e2fsck/e2fsck.h b/e2fsck/e2fsck.h
index 93387bd6..896f5f39 100644
--- a/e2fsck/e2fsck.h
+++ b/e2fsck/e2fsck.h
@@ -227,6 +227,20 @@ typedef struct e2fsck_struct *e2fsck_t;
 
 #define MAX_EXTENT_DEPTH_COUNT 5
 
+/*
+ * Fields that used for multi-thread
+ */
+struct e2fsck_thread {
+	/* The start group number for this thread */
+	dgrp_t		et_group_start;
+	/* The end (not included) group number for this thread*/
+	dgrp_t		et_group_end;
+	/* The next group number to check */
+	dgrp_t		et_group_next;
+	/* Thread index */
+	int		et_thread_index;
+};
+
 struct e2fsck_struct {
 	/* ---- Following fields are never updated during the pass1 ---- */
 	/* Global context to get the cancel flag */
@@ -378,8 +392,8 @@ struct e2fsck_struct {
 	 */
 	ext2_ino_t		stashed_ino;
 	struct ext2_inode	*stashed_inode;
-	/* Thread index, if global_ctx is null, this field is useless */
-	int			thread_index;
+	/* if @global_ctx is null, this field is useless */
+	struct e2fsck_thread	 thread_info;
 
 	/*
 	 * Directory information
diff --git a/e2fsck/logfile.c b/e2fsck/logfile.c
index 17bfc86e..8b5de135 100644
--- a/e2fsck/logfile.c
+++ b/e2fsck/logfile.c
@@ -311,8 +311,9 @@ static FILE *set_up_log_file(e2fsck_t ctx, const char *key, const char *fn)
 
 	expand_logfn(ctx, log_fn, &s);
 	if (ctx->global_ctx) {
-		assert(ctx->thread_index < 1000);
-		sprintf(string_index, "%03d", ctx->thread_index);
+		assert(ctx->thread_info.et_thread_index < 1000);
+		sprintf(string_index, "%03d",
+			ctx->thread_info.et_thread_index);
 		append_string(&s, ".", 1);
 		append_string(&s, string_index, 0);
 	}
diff --git a/e2fsck/pass1.c b/e2fsck/pass1.c
index 35806f29..45915513 100644
--- a/e2fsck/pass1.c
+++ b/e2fsck/pass1.c
@@ -1368,6 +1368,19 @@ void _e2fsck_pass1(e2fsck_t ctx)
 	/* Set up ctx->lost_and_found if possible */
 	(void) e2fsck_get_lost_and_found(ctx, 0);
 
+	if (ctx->global_ctx) {
+#if 0
+		printf("jumping to %d\n", ctx->thread_info.et_group_start);
+#endif
+		pctx.errcode = ext2fs_inode_scan_goto_blockgroup(scan,
+					ctx->thread_info.et_group_start);
+		if (pctx.errcode) {
+			fix_problem(ctx, PR_1_PASS_HEADER, &pctx);
+			ctx->flags |= E2F_FLAG_ABORT;
+			goto endit;
+		}
+	}
+
 	while (1) {
 		if (ino % (fs->super->s_inodes_per_group * 4) == 1) {
 			if (e2fsck_mmp_update(fs))
@@ -1411,6 +1424,8 @@ void _e2fsck_pass1(e2fsck_t ctx)
 			ext2fs_mark_inode_bitmap2(ctx->inode_used_map, ino);
 			continue;
 		}
+		if (pctx.errcode == EXT2_ET_SCAN_FINISHED)
+			break;
 		if (pctx.errcode &&
 		    pctx.errcode != EXT2_ET_INODE_CSUM_INVALID &&
 		    pctx.errcode != EXT2_ET_INODE_IS_GARBAGE) {
@@ -2284,12 +2299,15 @@ static int e2fsck_pass1_merge_fs(ext2_filsys dest, ext2_filsys src)
 	return retval;
 }
 
-static errcode_t e2fsck_pass1_thread_prepare(e2fsck_t global_ctx, e2fsck_t *thread_ctx)
+static errcode_t e2fsck_pass1_thread_prepare(e2fsck_t global_ctx,
+					     e2fsck_t *thread_ctx,
+					     int thread_index)
 {
-	errcode_t	retval;
-	e2fsck_t	thread_context;
-	ext2_filsys	thread_fs;
-	ext2_filsys	global_fs = global_ctx->fs;
+	errcode_t		 retval;
+	e2fsck_t		 thread_context;
+	ext2_filsys		 thread_fs;
+	ext2_filsys		 global_fs = global_ctx->fs;
+	struct e2fsck_thread	*tinfo;
 
 	assert(global_ctx->inode_used_map == NULL);
 	assert(global_ctx->inode_dir_map == NULL);
@@ -2325,9 +2343,15 @@ static errcode_t e2fsck_pass1_thread_prepare(e2fsck_t global_ctx, e2fsck_t *thre
 	}
 	thread_fs->priv_data = thread_context;
 
-	thread_context->thread_index = 0;
+	thread_context->thread_info.et_thread_index = thread_index;
 	set_up_logging(thread_context);
 
+	assert(thread_index == 0);
+	tinfo = &thread_context->thread_info;
+	tinfo->et_group_start = 0;
+	tinfo->et_group_next = 0;
+	tinfo->et_group_end = thread_fs->group_desc_count;
+
 	thread_context->fs = thread_fs;
 	*thread_ctx = thread_context;
 	return 0;
@@ -2487,7 +2511,7 @@ static int e2fsck_pass1_threads_start(struct e2fsck_thread_info **pinfo,
 	for (i = 0; i < num_threads; i++) {
 		tmp_pinfo = &infos[i];
 		tmp_pinfo->eti_thread_index = i;
-		retval = e2fsck_pass1_thread_prepare(global_ctx, &thread_ctx);
+		retval = e2fsck_pass1_thread_prepare(global_ctx, &thread_ctx, i);
 		if (retval) {
 			com_err(global_ctx->program_name, retval,
 				_("while preparing pass1 thread\n"));
@@ -2566,6 +2590,7 @@ static errcode_t scan_callback(ext2_filsys fs,
 {
 	struct scan_callback_struct *scan_struct;
 	e2fsck_t ctx;
+	struct e2fsck_thread *tinfo;
 
 	scan_struct = (struct scan_callback_struct *) priv_data;
 	ctx = scan_struct->ctx;
@@ -2577,6 +2602,13 @@ static errcode_t scan_callback(ext2_filsys fs,
 				    ctx->fs->group_desc_count))
 			return EXT2_ET_CANCEL_REQUESTED;
 
+	if (ctx->global_ctx) {
+		tinfo = &ctx->thread_info;
+		tinfo->et_group_next++;
+		if (tinfo->et_group_next >= tinfo->et_group_end)
+			return EXT2_ET_SCAN_FINISHED;
+	}
+
 	return 0;
 }
 
diff --git a/e2fsck/problem.c b/e2fsck/problem.c
index e79c853b..22c2652c 100644
--- a/e2fsck/problem.c
+++ b/e2fsck/problem.c
@@ -1269,6 +1269,11 @@ static struct e2fsck_problem problem_table[] = {
 	  N_("Encrypted @i %i has corrupt encryption @a.\n"),
 	  PROMPT_CLEAR_INODE, 0, 0, 0, 0 },
 
+	/* Failed to goto block group */
+	{ PR_1_SCAN_GOTO,
+	  N_("failed to goto block group"),
+          PROMPT_NONE, PR_FATAL, 0, 0, 0 },
+
 	/* Pass 1b errors */
 
 	/* Pass 1B: Rescan for duplicate/bad blocks */
diff --git a/e2fsck/problem.h b/e2fsck/problem.h
index 4185e517..c2a1cbdf 100644
--- a/e2fsck/problem.h
+++ b/e2fsck/problem.h
@@ -707,6 +707,9 @@ struct problem_context {
 /* Encrypted inode has corrupt encryption extended attribute */
 #define PR_1_CORRUPT_ENCRYPTION_XATTR		0x01008B
 
+/* Failed to goto block group */
+#define PR_1_SCAN_GOTO				0x01008C
+
 /*
  * Pass 1b errors
  */
diff --git a/lib/ext2fs/ext2_err.et.in b/lib/ext2fs/ext2_err.et.in
index 0c76fee6..cdb37423 100644
--- a/lib/ext2fs/ext2_err.et.in
+++ b/lib/ext2fs/ext2_err.et.in
@@ -548,4 +548,7 @@ ec	EXT2_ET_EA_INODE_CORRUPTED,
 ec	EXT2_ET_NO_GDESC,
 	"Group descriptors not loaded"
 
+ec	EXT2_ET_SCAN_FINISHED,
+	"Scanning finished"
+
 	end
-- 
2.25.4

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