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Thu, 7 May 2020 00:43:54 GMT Received: from aserv0122.oracle.com (aserv0122.oracle.com [141.146.126.236]) by userp3030.oracle.com with ESMTP id 30t1r95at8-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 07 May 2020 00:43:54 +0000 Received: from abhmp0014.oracle.com (abhmp0014.oracle.com [141.146.116.20]) by aserv0122.oracle.com (8.14.4/8.14.4) with ESMTP id 0470hqGB020317; Thu, 7 May 2020 00:43:52 GMT Received: from ayz-linux.localdomain (/68.7.158.207) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Wed, 06 May 2020 17:43:52 -0700 From: Anthony Yznaga To: linux-mm@kvack.org, linux-kernel@vger.kernel.org Cc: willy@infradead.org, corbet@lwn.net, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, x86@kernel.org, hpa@zytor.com, dave.hansen@linux.intel.com, luto@kernel.org, peterz@infradead.org, rppt@linux.ibm.com, akpm@linux-foundation.org, hughd@google.com, ebiederm@xmission.com, masahiroy@kernel.org, ardb@kernel.org, ndesaulniers@google.com, dima@golovin.in, daniel.kiper@oracle.com, nivedita@alum.mit.edu, rafael.j.wysocki@intel.com, dan.j.williams@intel.com, zhenzhong.duan@oracle.com, jroedel@suse.de, bhe@redhat.com, guro@fb.com, Thomas.Lendacky@amd.com, andriy.shevchenko@linux.intel.com, keescook@chromium.org, hannes@cmpxchg.org, minchan@kernel.org, mhocko@kernel.org, ying.huang@intel.com, yang.shi@linux.alibaba.com, gustavo@embeddedor.com, ziqian.lzq@antfin.com, vdavydov.dev@gmail.com, jason.zeng@intel.com, kevin.tian@intel.com, zhiyuan.lv@intel.com, lei.l.li@intel.com, paul.c.lai@intel.com, ashok.raj@intel.com, linux-fsdevel@vger.kernel.org, linux-doc@vger.kernel.org, kexec@lists.infradead.org Subject: [RFC 22/43] mm: shmem: introduce shmem_insert_page Date: Wed, 6 May 2020 17:41:48 -0700 Message-Id: <1588812129-8596-23-git-send-email-anthony.yznaga@oracle.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1588812129-8596-1-git-send-email-anthony.yznaga@oracle.com> References: <1588812129-8596-1-git-send-email-anthony.yznaga@oracle.com> X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9613 signatures=668687 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 bulkscore=0 adultscore=0 suspectscore=2 spamscore=0 mlxlogscore=999 malwarescore=0 phishscore=0 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2003020000 definitions=main-2005070001 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9613 signatures=668687 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 bulkscore=0 mlxscore=0 lowpriorityscore=0 spamscore=0 adultscore=0 clxscore=1015 suspectscore=2 priorityscore=1501 malwarescore=0 mlxlogscore=999 phishscore=0 impostorscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2003020000 definitions=main-2005070001 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: The function inserts a page into a shmem file at a specified offset. The page can be a regular PAGE_SIZE page or a transparent huge page. If there is something at the offset (page or swap), the function fails. The function will be used by the next patch. Originally-by: Vladimir Davydov Signed-off-by: Anthony Yznaga --- include/linux/shmem_fs.h | 3 ++ mm/shmem.c | 95 ++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 98 insertions(+) diff --git a/include/linux/shmem_fs.h b/include/linux/shmem_fs.h index 7a35a6901221..688b92cd4ec7 100644 --- a/include/linux/shmem_fs.h +++ b/include/linux/shmem_fs.h @@ -96,6 +96,9 @@ enum sgp_type { extern int shmem_getpage(struct inode *inode, pgoff_t index, struct page **pagep, enum sgp_type sgp); +extern int shmem_insert_page(struct mm_struct *mm, struct inode *inode, + pgoff_t index, struct page *page); + static inline struct page *shmem_read_mapping_page( struct address_space *mapping, pgoff_t index) { diff --git a/mm/shmem.c b/mm/shmem.c index bd8840082c94..0a9a2166e51f 100644 --- a/mm/shmem.c +++ b/mm/shmem.c @@ -677,6 +677,101 @@ static void shmem_delete_from_page_cache(struct page *page, void *radswap) BUG_ON(error); } +int shmem_insert_page(struct mm_struct *mm, struct inode *inode, pgoff_t index, + struct page *page) +{ + struct address_space *mapping = inode->i_mapping; + struct shmem_inode_info *info = SHMEM_I(inode); + struct shmem_sb_info *sbinfo = SHMEM_SB(inode->i_sb); + gfp_t gfp = mapping_gfp_mask(mapping); + int err; + int nr = 1; + struct mem_cgroup *memcg; + pgoff_t hindex = index; + bool on_lru = PageLRU(page); + + if (index > (MAX_LFS_FILESIZE >> PAGE_SHIFT)) + return -EFBIG; + + if (PageTransHuge(page)) + nr = HPAGE_PMD_NR; + else + nr = 1; +retry: + err = 0; + if (!shmem_inode_acct_block(inode, nr)) + err = -ENOSPC; + if (err) { + int retry = 5; + + /* + * Try to reclaim some space by splitting a huge page + * beyond i_size on the filesystem. + */ + while (retry--) { + int ret; + + ret = shmem_unused_huge_shrink(sbinfo, NULL, 1); + if (ret == SHRINK_STOP) + break; + if (ret) + goto retry; + } + goto failed; + } + + if (!on_lru) { + __SetPageLocked(page); + __SetPageSwapBacked(page); + } else { + lock_page(page); + } + + if (PageTransHuge(page)) + hindex = round_down(index, HPAGE_PMD_NR); + else + hindex = index; + + __SetPageReferenced(page); + + err = mem_cgroup_try_charge_delay(page, mm, gfp, &memcg, + PageTransHuge(page)); + if (err) + goto out_unlock; + + err = shmem_add_to_page_cache(page, mapping, hindex, + NULL, gfp & GFP_RECLAIM_MASK); + if (err) { + mem_cgroup_cancel_charge(page, memcg, + PageTransHuge(page)); + goto out_unlock; + } + mem_cgroup_commit_charge(page, memcg, on_lru, + PageTransHuge(page)); + + if (!on_lru) + lru_cache_add_anon(page); + + spin_lock(&info->lock); + info->alloced += compound_nr(page); + inode->i_blocks += BLOCKS_PER_PAGE << compound_order(page); + shmem_recalc_inode(inode); + spin_unlock(&info->lock); + + flush_dcache_page(page); + SetPageUptodate(page); + set_page_dirty(page); + + unlock_page(page); + return 0; + +out_unlock: + unlock_page(page); + shmem_inode_unacct_blocks(inode, nr); +failed: + return err; +} + /* * Remove swap entry from page cache, free the swap and its page cache. */