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[130.117.225.111]) by mx.google.com with ESMTPS id ffacd0b85a97d-48dbfdebc73si14701074f8f.287.2026.10.12.06.26.54 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 12 Oct 2026 06:26:55 -0700 (PDT) Received-SPF: pass (google.com: domain of alexander.ivanov@virtuozzo.com designates 130.117.225.111 as permitted sender) client-ip=130.117.225.111; Authentication-Results: mx.google.com; dkim=pass header.i=@virtuozzo.com header.s=relay header.b=aY6hJyGU; spf=pass (google.com: domain of alexander.ivanov@virtuozzo.com designates 130.117.225.111 as permitted sender) smtp.mailfrom=alexander.ivanov@virtuozzo.com; dmarc=pass (p=QUARANTINE sp=QUARANTINE dis=NONE) header.from=virtuozzo.com DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=virtuozzo.com; s=relay; h=MIME-Version:Message-ID:Date:Subject:From: Content-Type; bh=PyddkjEHIPck8bzYCzzFrzm5PHvZPbMnv8wcMopIueE=; b=aY6hJyGURR4H q6PMlcBzt8jdtSHzUFotmSEIKrnThJGWkfx4PMeC0pwKSDfZx+IZU3r6iZvrHcKzwFH6yD1/beZpS 5hJ4PalAxGWqgcTvNDVITdcgs9hiWBm4HIcJACYjk6echtrQXfKDCC3I3tXPdtxB+Gkk/jZlu/Qmp VFVOdmxw/Knq4cakLFUCF+I802Brj8HBa6RznZj+Rx+ZHboMXKg5ZEfcZFuxROIxMG5mtQUVniCUA yH8HO7ktgDdFThI+mPfT512fPDfsAZY/hSFoxB0QqDld0M6SgIU3Jtk+/Xq5O6KBwFAvMW5HyPlmS c4ou7gfBnOhDR4ywD3py4w==; Received: from ch-vpn.virtuozzo.com ([130.117.225.6] helo=sky) by relay.virtuozzo.com with esmtps (TLS1.3) tls TLS_AES_256_GCM_SHA384 (Exim 4.96) (envelope-from ) id 1xGFzw-001WAY-1b; Mon, 12 Oct 2026 15:26:46 +0200 From: Alexander Ivanov To: den@openvz.org Date: Mon, 12 Oct 2026 15:26:41 +0200 Message-ID: <20261012132646.41494-7-alexander.ivanov@virtuozzo.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20261012132646.41494-1-alexander.ivanov@virtuozzo.com> References: <20261012132646.41494-1-alexander.ivanov@virtuozzo.com> MIME-Version: 1.0 X-OZ-Fwd: true Cc: devel@openvz.org Subject: [Devel] [PATCH hci-8.1 v4 06/11] dm-ploop: factor out ploop_read_delta() from ploop_add_delta() X-BeenThere: devel@openvz.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: OpenVZ development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: devel-bounces@openvz.org Errors-To: devel-bounces@openvz.org Move reading of delta BAT and applying its mappings to ploop->bat_entries into a separate function ploop_read_delta(). It will be used to reload metadata of already added deltas. ploop_read_delta() takes is_raw from deltas[level], so ploop_add_delta() sets it before the call. Replace the stale comment of ploop_add_delta(): it claimed deltas are added from oldest to newest, while ploop_add_deltas_stack() adds them from top to base, which ploop_read_delta() relies on. No functional changes. https://virtuozzo.atlassian.net/browse/VSTOR-148171 Feature: dm-ploop: ploop target driver Signed-off-by: Alexander Ivanov Reviewed-by: Denis V. Lunev --- drivers/md/dm-ploop-bat.c | 43 +++++++++++++++++++++++++++++++-------- 1 file changed, 35 insertions(+), 8 deletions(-) diff --git a/drivers/md/dm-ploop-bat.c b/drivers/md/dm-ploop-bat.c index 3427d1a90d81..5a89771a2e02 100644 --- a/drivers/md/dm-ploop-bat.c +++ b/drivers/md/dm-ploop-bat.c @@ -481,23 +481,27 @@ int ploop_check_delta_length(struct ploop *ploop, struct file *file, loff_t *fil ALLOW_ERROR_INJECTION(ploop_check_delta_length, ERRNO); /* - * @fd refers to a new delta, which is placed right before top_delta. - * So, userspace has to populate deltas stack from oldest to newest. + * Read BAT of delta @level and apply its mappings to ploop->bat_entries. + * deltas[@level].is_raw and nr_be of upper deltas must be already set. + * + * Deltas must be read from top to base: mappings of upper deltas take + * precedence (already populated BAT entries are not overwritten), and + * size of the delta is checked against nr_be of the upper one. */ -int ploop_add_delta(struct ploop *ploop, u32 level, struct file *file, bool is_raw) +static int ploop_read_delta(struct ploop *ploop, u32 level, struct file *file, + loff_t *file_size_ret, u32 *nr_be_ret) { struct ploop_delta *deltas = ploop->deltas; struct rb_root md_root = RB_ROOT; - struct file *cloned_file = NULL; loff_t file_size; u32 nr_be; - int ret, i; + int ret; ret = ploop_check_delta_length(ploop, file, &file_size); if (ret) goto out; - if (!is_raw) { + if (!deltas[level].is_raw) { ret = ploop_read_delta_metadata(ploop, file, &md_root, &nr_be); if (ret) goto out; @@ -512,9 +516,33 @@ int ploop_add_delta(struct ploop *ploop, u32 level, struct file *file, bool is_r if (level != ploop_top_level(ploop) && nr_be > deltas[level + 1].nr_be) goto out; - deltas[level].is_raw = is_raw; ploop_apply_delta_mappings(ploop, deltas, level, &md_root, nr_be); + *file_size_ret = file_size; + *nr_be_ret = nr_be; + ret = 0; +out: + ploop_free_md_pages_tree(&md_root); + return ret; +} + +/* + * Add @file as delta @level. Deltas must be added from top to base, + * see ploop_read_delta(). + */ +int ploop_add_delta(struct ploop *ploop, u32 level, struct file *file, bool is_raw) +{ + struct ploop_delta *deltas = ploop->deltas; + struct file *cloned_file = NULL; + loff_t file_size; + u32 nr_be; + int ret, i; + + deltas[level].is_raw = is_raw; + ret = ploop_read_delta(ploop, level, file, &file_size, &nr_be); + if (ret) + goto out; + deltas[level].file = file; deltas[level].mtfile = kcalloc(ploop->nkt_runners, sizeof(*file), GFP_KERNEL); @@ -535,7 +563,6 @@ int ploop_add_delta(struct ploop *ploop, u32 level, struct file *file, bool is_r deltas[level].nr_be = nr_be; ret = 0; out: - ploop_free_md_pages_tree(&md_root); return ret; } ALLOW_ERROR_INJECTION(ploop_add_delta, ERRNO); -- 2.53.0 _______________________________________________ Devel mailing list Devel@openvz.org https://lists.openvz.org/mailman/listinfo/devel