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Mon, 08 Aug 2022 07:36:14 +0000 Received: from pps.filterd (APTAIPPMTA01.qualcomm.com [127.0.0.1]) by APTAIPPMTA01.qualcomm.com (8.17.1.5/8.17.1.5) with ESMTP id 2787aBpM021915; Mon, 8 Aug 2022 07:36:11 GMT Received: from pps.reinject (localhost [127.0.0.1]) by APTAIPPMTA01.qualcomm.com (PPS) with ESMTP id 3hshcpntf1-1; Mon, 08 Aug 2022 07:36:11 +0000 Received: from APTAIPPMTA01.qualcomm.com (APTAIPPMTA01.qualcomm.com [127.0.0.1]) by pps.reinject (8.17.1.5/8.17.1.5) with ESMTP id 2787aBH4021910; Mon, 8 Aug 2022 07:36:11 GMT Received: from maow2-gv.ap.qualcomm.com (maow2-gv.qualcomm.com [10.232.193.133]) by APTAIPPMTA01.qualcomm.com (PPS) with ESMTP id 2787aAmw021896; Mon, 08 Aug 2022 07:36:11 +0000 Received: by maow2-gv.ap.qualcomm.com (Postfix, from userid 399080) id 5B49A21029A6; Mon, 8 Aug 2022 15:36:08 +0800 (CST) From: Kassey Li To: akpm@linux-foundation.org, vbabka@kernel.org Cc: Kassey Li , minchan@kernel.org, iamjoonsoo.kim@lge.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH v4] mm/page_owner.c: add llseek for page_owner Date: Mon, 8 Aug 2022 15:36:06 +0800 Message-Id: <20220808073606.29666-1-quic_yingangl@quicinc.com> X-Mailer: git-send-email 2.17.1 X-QCInternal: smtphost X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-GUID: NZXkGcpFxdd2u-O0Gb_QsAw1zV5mxBhd X-Proofpoint-ORIG-GUID: NZXkGcpFxdd2u-O0Gb_QsAw1zV5mxBhd X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.883,Hydra:6.0.517,FMLib:17.11.122.1 definitions=2022-08-08_05,2022-08-05_01,2022-06-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 mlxscore=0 spamscore=0 lowpriorityscore=0 priorityscore=1501 suspectscore=0 adultscore=0 malwarescore=0 mlxlogscore=758 bulkscore=0 impostorscore=0 phishscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2206140000 definitions=main-2208080038 ARC-Message-Signature: i=1; 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dkim=pass header.d=quicinc.com header.s=qcppdkim1 header.b=QivNZyWX; dmarc=pass (policy=none) header.from=quicinc.com; spf=pass (imf19.hostedemail.com: domain of yingangl@qualcomm.com designates 205.220.180.131 as permitted sender) smtp.mailfrom=yingangl@qualcomm.com X-Rspam-User: X-Rspamd-Server: rspam07 X-Stat-Signature: zirtjuis87k7z86gi1bhimf3ysucabbd X-HE-Tag: 1659944183-361161 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: There is usage to dump a given cma region page_owner instead of all page's. This change allows to specify a ppos as start_pfn by fseek. Any invalid ppos will be skipped, so it did not broken the origin dump feature. Suggested-by: Vlastimil Babka (SUSE) Signed-off-by: Kassey Li --- mm/page_owner.c | 20 ++++++++++++++++++-- 1 file changed, 18 insertions(+), 2 deletions(-) diff --git a/mm/page_owner.c b/mm/page_owner.c index e4c6f3f1695b..231b1877af99 100644 --- a/mm/page_owner.c +++ b/mm/page_owner.c @@ -497,8 +497,8 @@ read_page_owner(struct file *file, char __user *buf, size_t count, loff_t *ppos) return -EINVAL; page = NULL; - pfn = min_low_pfn + *ppos; + pfn = *ppos; /* Find a valid PFN or the start of a MAX_ORDER_NR_PAGES area */ while (!pfn_valid(pfn) && (pfn & (MAX_ORDER_NR_PAGES - 1)) != 0) pfn++; @@ -561,7 +561,7 @@ read_page_owner(struct file *file, char __user *buf, size_t count, loff_t *ppos) continue; /* Record the next PFN to read in the file offset */ - *ppos = (pfn - min_low_pfn) + 1; + *ppos = pfn + 1; return print_page_owner(buf, count, pfn, page, page_owner, handle); @@ -570,6 +570,21 @@ read_page_owner(struct file *file, char __user *buf, size_t count, loff_t *ppos) return 0; } +static loff_t llseek_page_owner(struct file *file, loff_t offset, int whence) +{ + loff_t retval = 0; + switch (whence) { + case SEEK_CUR: + case SEEK_SET: + file->f_pos = offset; + break; + default: + retval = -ENXIO; + } + + return retval; +} + static void init_pages_in_zone(pg_data_t *pgdat, struct zone *zone) { unsigned long pfn = zone->zone_start_pfn; @@ -660,6 +675,7 @@ static void init_early_allocated_pages(void) static const struct file_operations proc_page_owner_operations = { .read = read_page_owner, + .llseek = llseek_page_owner, }; static int __init pageowner_init(void)