linux-ext4 - [RFCv1 11/72] libext2fs: merge quota context after threads finish

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Date:   Mon,  7 Nov 2022 17:50:59 +0530
From:   "Ritesh Harjani (IBM)" <ritesh.list@...il.com>
To:     Theodore Ts'o <tytso@....edu>
Cc:     linux-ext4@...r.kernel.org,
        Harshad Shirwadkar <harshadshirwadkar@...il.com>,
        Wang Shilong <wshilong@....com>,
        Andreas Dilger <adilger.kernel@...ger.ca>,
        Li Xi <lixi@....com>, Ritesh Harjani <ritesh.list@...il.com>
Subject: [RFCv1 11/72] libext2fs: merge quota context after threads finish

From: Wang Shilong <wshilong@....com>

Every threads calculate its own quota accounting,
merge them after threads finish.

Signed-off-by: Wang Shilong <wshilong@....com>
[Note: splitted the patch to seperate libext2fs changes from e2fsck]
Signed-off-by: Ritesh Harjani (IBM) <ritesh.list@...il.com>
---
 lib/support/mkquota.c | 39 +++++++++++++++++++++++++++++++++++++++
 lib/support/quotaio.h |  3 +++
 2 files changed, 42 insertions(+)

diff --git a/lib/support/mkquota.c b/lib/support/mkquota.c
index 9339c994..ce1ab4cd 100644
--- a/lib/support/mkquota.c
+++ b/lib/support/mkquota.c
@@ -618,6 +618,45 @@ out:
 	return err;
 }
 
+static errcode_t merge_usage(dict_t *dest, dict_t *src)
+{
+	dnode_t *n;
+	struct dquot *src_dq, *dest_dq;
+
+	for (n = dict_first(src); n; n = dict_next(src, n)) {
+		src_dq = dnode_get(n);
+		if (!src_dq)
+			continue;
+		dest_dq = get_dq(dest, src_dq->dq_id);
+		if (dest_dq == NULL)
+			return -ENOMEM;
+		dest_dq->dq_dqb.dqb_curspace += src_dq->dq_dqb.dqb_curspace;
+		dest_dq->dq_dqb.dqb_curinodes += src_dq->dq_dqb.dqb_curinodes;
+	}
+
+	return 0;
+}
+
+
+errcode_t quota_merge_and_update_usage(quota_ctx_t dest_qctx,
+					quota_ctx_t src_qctx)
+{
+	dict_t *dict;
+	enum quota_type	qtype;
+	errcode_t retval = 0;
+
+	for (qtype = 0; qtype < MAXQUOTAS; qtype++) {
+		dict = src_qctx->quota_dict[qtype];
+		if (!dict)
+			continue;
+		retval = merge_usage(dest_qctx->quota_dict[qtype], dict);
+		if (retval)
+			break;
+	}
+
+	return retval;
+}
+
 /*
  * Compares the measured quota in qctx->quota_dict with that in the quota inode
  * on disk and updates the limits in qctx->quota_dict. 'usage_inconsistent' is
diff --git a/lib/support/quotaio.h b/lib/support/quotaio.h
index 84fac35d..240a0762 100644
--- a/lib/support/quotaio.h
+++ b/lib/support/quotaio.h
@@ -40,6 +40,7 @@
 #include "ext2fs/ext2_fs.h"
 #include "ext2fs/ext2fs.h"
 #include "dqblk_v2.h"
+#include "support/dict.h"
 
 typedef int64_t qsize_t;	/* Type in which we store size limitations */
 
@@ -236,6 +237,8 @@ int quota_file_exists(ext2_filsys fs, enum quota_type qtype);
 void quota_set_sb_inum(ext2_filsys fs, ext2_ino_t ino, enum quota_type qtype);
 errcode_t quota_compare_and_update(quota_ctx_t qctx, enum quota_type qtype,
 				   int *usage_inconsistent);
+errcode_t quota_merge_and_update_usage(quota_ctx_t dest_qctx,
+					quota_ctx_t src_qctx);
 int parse_quota_opts(const char *opts, int (*func)(char *));
 
 /* parse_qtype.c */
-- 
2.37.3