From patchwork Fri Sep 24 13:09:52 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shiyang Ruan X-Patchwork-Id: 12515393 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 13937C43219 for ; Fri, 24 Sep 2021 13:19:55 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id EB31761038 for ; Fri, 24 Sep 2021 13:19:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1346265AbhIXNV0 (ORCPT ); Fri, 24 Sep 2021 09:21:26 -0400 Received: from mail.cn.fujitsu.com ([183.91.158.132]:44756 "EHLO heian.cn.fujitsu.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1345419AbhIXNU4 (ORCPT ); Fri, 24 Sep 2021 09:20:56 -0400 IronPort-Data: A9a23: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 IronPort-HdrOrdr: A9a23:ZepfbqwU4Hl03Sflu7/qKrPwyL1zdoMgy1knxilNoRw8SKKlfqeV7ZImPH7P+U8ssR4b+exoVJPtfZqYz+8R3WBzB8bEYOCFghrKEGgK1+KLqFeMJ8S9zJ846U4KSclD4bPLYmSS9fyKgjVQDexQveWvweS5g/vE1XdxQUVPY6Fk1Q1wDQGWCSRNNXJ7LKt8BJyB/dBGujblXXwWa/6wDn4DU/OGiMbMkPvdEGQ7Li9i+A+Tlimp9bK/NxCZ2y0VWzRJzaxn0UWtqX2A2pme X-IronPort-AV: E=Sophos;i="5.85,319,1624291200"; d="scan'208";a="114917443" Received: from unknown (HELO cn.fujitsu.com) ([10.167.33.5]) by heian.cn.fujitsu.com with ESMTP; 24 Sep 2021 21:10:18 +0800 Received: from G08CNEXMBPEKD04.g08.fujitsu.local (unknown [10.167.33.201]) by cn.fujitsu.com (Postfix) with ESMTP id 9E49E4D0DC79; Fri, 24 Sep 2021 21:10:13 +0800 (CST) Received: from G08CNEXCHPEKD09.g08.fujitsu.local (10.167.33.85) by G08CNEXMBPEKD04.g08.fujitsu.local (10.167.33.201) with Microsoft SMTP Server (TLS) id 15.0.1497.23; Fri, 24 Sep 2021 21:10:03 +0800 Received: from irides.mr.mr.mr (10.167.225.141) by G08CNEXCHPEKD09.g08.fujitsu.local (10.167.33.209) with Microsoft SMTP Server id 15.0.1497.23 via Frontend Transport; Fri, 24 Sep 2021 21:10:01 +0800 From: Shiyang Ruan To: , , , , CC: , , , , Subject: [PATCH v7 1/8] dax: Use rwsem for dax_{read,write}_lock() Date: Fri, 24 Sep 2021 21:09:52 +0800 Message-ID: <20210924130959.2695749-2-ruansy.fnst@fujitsu.com> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20210924130959.2695749-1-ruansy.fnst@fujitsu.com> References: <20210924130959.2695749-1-ruansy.fnst@fujitsu.com> MIME-Version: 1.0 X-yoursite-MailScanner-ID: 9E49E4D0DC79.A3DFD X-yoursite-MailScanner: Found to be clean X-yoursite-MailScanner-From: ruansy.fnst@fujitsu.com Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org In order to introduce dax holder registration, we need a write lock for dax. Because of the rarity of notification failures and the infrequency of registration events, it would be better to be a global lock rather than per-device. So, change the current lock to rwsem and introduce a write lock for registration. Signed-off-by: Shiyang Ruan --- drivers/dax/device.c | 11 +++++----- drivers/dax/super.c | 43 ++++++++++++++++++++++---------------- drivers/md/dm-writecache.c | 7 +++---- fs/dax.c | 26 +++++++++++------------ include/linux/dax.h | 9 ++++---- 5 files changed, 49 insertions(+), 47 deletions(-) diff --git a/drivers/dax/device.c b/drivers/dax/device.c index dd8222a42808..cc7b835509f9 100644 --- a/drivers/dax/device.c +++ b/drivers/dax/device.c @@ -198,7 +198,6 @@ static vm_fault_t dev_dax_huge_fault(struct vm_fault *vmf, struct file *filp = vmf->vma->vm_file; unsigned long fault_size; vm_fault_t rc = VM_FAULT_SIGBUS; - int id; pfn_t pfn; struct dev_dax *dev_dax = filp->private_data; @@ -206,7 +205,7 @@ static vm_fault_t dev_dax_huge_fault(struct vm_fault *vmf, (vmf->flags & FAULT_FLAG_WRITE) ? "write" : "read", vmf->vma->vm_start, vmf->vma->vm_end, pe_size); - id = dax_read_lock(); + dax_read_lock(); switch (pe_size) { case PE_SIZE_PTE: fault_size = PAGE_SIZE; @@ -246,7 +245,7 @@ static vm_fault_t dev_dax_huge_fault(struct vm_fault *vmf, page->index = pgoff + i; } } - dax_read_unlock(id); + dax_read_unlock(); return rc; } @@ -284,7 +283,7 @@ static const struct vm_operations_struct dax_vm_ops = { static int dax_mmap(struct file *filp, struct vm_area_struct *vma) { struct dev_dax *dev_dax = filp->private_data; - int rc, id; + int rc; dev_dbg(&dev_dax->dev, "trace\n"); @@ -292,9 +291,9 @@ static int dax_mmap(struct file *filp, struct vm_area_struct *vma) * We lock to check dax_dev liveness and will re-check at * fault time. */ - id = dax_read_lock(); + dax_read_lock(); rc = check_vma(dev_dax, vma, __func__); - dax_read_unlock(id); + dax_read_unlock(); if (rc) return rc; diff --git a/drivers/dax/super.c b/drivers/dax/super.c index fc89e91beea7..48ce86501d93 100644 --- a/drivers/dax/super.c +++ b/drivers/dax/super.c @@ -36,7 +36,7 @@ struct dax_device { }; static dev_t dax_devt; -DEFINE_STATIC_SRCU(dax_srcu); +static DECLARE_RWSEM(dax_rwsem); static struct vfsmount *dax_mnt; static DEFINE_IDA(dax_minor_ida); static struct kmem_cache *dax_cache __read_mostly; @@ -46,18 +46,28 @@ static struct super_block *dax_superblock __read_mostly; static struct hlist_head dax_host_list[DAX_HASH_SIZE]; static DEFINE_SPINLOCK(dax_host_lock); -int dax_read_lock(void) +void dax_read_lock(void) { - return srcu_read_lock(&dax_srcu); + down_read(&dax_rwsem); } EXPORT_SYMBOL_GPL(dax_read_lock); -void dax_read_unlock(int id) +void dax_read_unlock(void) { - srcu_read_unlock(&dax_srcu, id); + up_read(&dax_rwsem); } EXPORT_SYMBOL_GPL(dax_read_unlock); +void dax_write_lock(void) +{ + down_write(&dax_rwsem); +} + +void dax_write_unlock(void) +{ + up_write(&dax_rwsem); +} + static int dax_host_hash(const char *host) { return hashlen_hash(hashlen_string("DAX", host)) % DAX_HASH_SIZE; @@ -70,14 +80,14 @@ static int dax_host_hash(const char *host) static struct dax_device *dax_get_by_host(const char *host) { struct dax_device *dax_dev, *found = NULL; - int hash, id; + int hash; if (!host) return NULL; hash = dax_host_hash(host); - id = dax_read_lock(); + dax_read_lock(); spin_lock(&dax_host_lock); hlist_for_each_entry(dax_dev, &dax_host_list[hash], list) { if (!dax_alive(dax_dev) @@ -89,7 +99,7 @@ static struct dax_device *dax_get_by_host(const char *host) break; } spin_unlock(&dax_host_lock); - dax_read_unlock(id); + dax_read_unlock(); return found; } @@ -130,7 +140,7 @@ bool generic_fsdax_supported(struct dax_device *dax_dev, pfn_t pfn, end_pfn; sector_t last_page; long len, len2; - int err, id; + int err; if (blocksize != PAGE_SIZE) { pr_info("%pg: error: unsupported blocksize for dax\n", bdev); @@ -155,14 +165,14 @@ bool generic_fsdax_supported(struct dax_device *dax_dev, return false; } - id = dax_read_lock(); + dax_read_lock(); len = dax_direct_access(dax_dev, pgoff, 1, &kaddr, &pfn); len2 = dax_direct_access(dax_dev, pgoff_end, 1, &end_kaddr, &end_pfn); if (len < 1 || len2 < 1) { pr_info("%pg: error: dax access failed (%ld)\n", bdev, len < 1 ? len : len2); - dax_read_unlock(id); + dax_read_unlock(); return false; } @@ -192,7 +202,7 @@ bool generic_fsdax_supported(struct dax_device *dax_dev, put_dev_pagemap(end_pgmap); } - dax_read_unlock(id); + dax_read_unlock(); if (!dax_enabled) { pr_info("%pg: error: dax support not enabled\n", bdev); @@ -206,16 +216,15 @@ bool dax_supported(struct dax_device *dax_dev, struct block_device *bdev, int blocksize, sector_t start, sector_t len) { bool ret = false; - int id; if (!dax_dev) return false; - id = dax_read_lock(); + dax_read_lock(); if (dax_alive(dax_dev) && dax_dev->ops->dax_supported) ret = dax_dev->ops->dax_supported(dax_dev, bdev, blocksize, start, len); - dax_read_unlock(id); + dax_read_unlock(); return ret; } EXPORT_SYMBOL_GPL(dax_supported); @@ -410,7 +419,7 @@ EXPORT_SYMBOL_GPL(__set_dax_synchronous); bool dax_alive(struct dax_device *dax_dev) { - lockdep_assert_held(&dax_srcu); + lockdep_assert_held(&dax_rwsem); return test_bit(DAXDEV_ALIVE, &dax_dev->flags); } EXPORT_SYMBOL_GPL(dax_alive); @@ -428,8 +437,6 @@ void kill_dax(struct dax_device *dax_dev) clear_bit(DAXDEV_ALIVE, &dax_dev->flags); - synchronize_srcu(&dax_srcu); - spin_lock(&dax_host_lock); hlist_del_init(&dax_dev->list); spin_unlock(&dax_host_lock); diff --git a/drivers/md/dm-writecache.c b/drivers/md/dm-writecache.c index 18320444fb0a..1067b3e98220 100644 --- a/drivers/md/dm-writecache.c +++ b/drivers/md/dm-writecache.c @@ -260,7 +260,6 @@ static int persistent_memory_claim(struct dm_writecache *wc) loff_t s; long p, da; pfn_t pfn; - int id; struct page **pages; sector_t offset; @@ -284,7 +283,7 @@ static int persistent_memory_claim(struct dm_writecache *wc) } offset >>= PAGE_SHIFT - 9; - id = dax_read_lock(); + dax_read_lock(); da = dax_direct_access(wc->ssd_dev->dax_dev, offset, p, &wc->memory_map, &pfn); if (da < 0) { @@ -334,7 +333,7 @@ static int persistent_memory_claim(struct dm_writecache *wc) wc->memory_vmapped = true; } - dax_read_unlock(id); + dax_read_unlock(); wc->memory_map += (size_t)wc->start_sector << SECTOR_SHIFT; wc->memory_map_size -= (size_t)wc->start_sector << SECTOR_SHIFT; @@ -343,7 +342,7 @@ static int persistent_memory_claim(struct dm_writecache *wc) err3: kvfree(pages); err2: - dax_read_unlock(id); + dax_read_unlock(); err1: return r; } diff --git a/fs/dax.c b/fs/dax.c index 4e3e5a283a91..798c43f09eee 100644 --- a/fs/dax.c +++ b/fs/dax.c @@ -715,22 +715,21 @@ static int copy_cow_page_dax(struct block_device *bdev, struct dax_device *dax_d void *vto, *kaddr; pgoff_t pgoff; long rc; - int id; rc = bdev_dax_pgoff(bdev, sector, PAGE_SIZE, &pgoff); if (rc) return rc; - id = dax_read_lock(); + dax_read_lock(); rc = dax_direct_access(dax_dev, pgoff, 1, &kaddr, NULL); if (rc < 0) { - dax_read_unlock(id); + dax_read_unlock(); return rc; } vto = kmap_atomic(to); copy_user_page(vto, (void __force *)kaddr, vaddr, to); kunmap_atomic(vto); - dax_read_unlock(id); + dax_read_unlock(); return 0; } @@ -1015,13 +1014,13 @@ static int dax_iomap_pfn(const struct iomap *iomap, loff_t pos, size_t size, { const sector_t sector = dax_iomap_sector(iomap, pos); pgoff_t pgoff; - int id, rc; + int rc; long length; rc = bdev_dax_pgoff(iomap->bdev, sector, size, &pgoff); if (rc) return rc; - id = dax_read_lock(); + dax_read_lock(); length = dax_direct_access(iomap->dax_dev, pgoff, PHYS_PFN(size), NULL, pfnp); if (length < 0) { @@ -1038,7 +1037,7 @@ static int dax_iomap_pfn(const struct iomap *iomap, loff_t pos, size_t size, goto out; rc = 0; out: - dax_read_unlock(id); + dax_read_unlock(); return rc; } @@ -1130,7 +1129,7 @@ s64 dax_iomap_zero(loff_t pos, u64 length, struct iomap *iomap) { sector_t sector = iomap_sector(iomap, pos & PAGE_MASK); pgoff_t pgoff; - long rc, id; + long rc; void *kaddr; bool page_aligned = false; unsigned offset = offset_in_page(pos); @@ -1144,14 +1143,14 @@ s64 dax_iomap_zero(loff_t pos, u64 length, struct iomap *iomap) if (rc) return rc; - id = dax_read_lock(); + dax_read_lock(); if (page_aligned) rc = dax_zero_page_range(iomap->dax_dev, pgoff, 1); else rc = dax_direct_access(iomap->dax_dev, pgoff, 1, &kaddr, NULL); if (rc < 0) { - dax_read_unlock(id); + dax_read_unlock(); return rc; } @@ -1159,7 +1158,7 @@ s64 dax_iomap_zero(loff_t pos, u64 length, struct iomap *iomap) memset(kaddr + offset, 0, size); dax_flush(iomap->dax_dev, kaddr + offset, size); } - dax_read_unlock(id); + dax_read_unlock(); return size; } @@ -1174,7 +1173,6 @@ static loff_t dax_iomap_iter(const struct iomap_iter *iomi, loff_t end = pos + length, done = 0; ssize_t ret = 0; size_t xfer; - int id; if (iov_iter_rw(iter) == READ) { end = min(end, i_size_read(iomi->inode)); @@ -1199,7 +1197,7 @@ static loff_t dax_iomap_iter(const struct iomap_iter *iomi, (end - 1) >> PAGE_SHIFT); } - id = dax_read_lock(); + dax_read_lock(); while (pos < end) { unsigned offset = pos & (PAGE_SIZE - 1); const size_t size = ALIGN(length + offset, PAGE_SIZE); @@ -1251,7 +1249,7 @@ static loff_t dax_iomap_iter(const struct iomap_iter *iomi, if (xfer < map_len) break; } - dax_read_unlock(id); + dax_read_unlock(); return done ? done : ret; } diff --git a/include/linux/dax.h b/include/linux/dax.h index 2619d94c308d..097b3304f9b9 100644 --- a/include/linux/dax.h +++ b/include/linux/dax.h @@ -177,15 +177,14 @@ static inline void dax_unlock_page(struct page *page, dax_entry_t cookie) #endif #if IS_ENABLED(CONFIG_DAX) -int dax_read_lock(void); -void dax_read_unlock(int id); +void dax_read_lock(void); +void dax_read_unlock(void); #else -static inline int dax_read_lock(void) +static inline void dax_read_lock(void) { - return 0; } -static inline void dax_read_unlock(int id) +static inline void dax_read_unlock(void) { } #endif /* CONFIG_DAX */ From patchwork Fri Sep 24 13:09:53 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shiyang Ruan X-Patchwork-Id: 12515391 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 09D1DC433FE for ; Fri, 24 Sep 2021 13:19:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E9E6761038 for ; Fri, 24 Sep 2021 13:19:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1346224AbhIXNVY (ORCPT ); Fri, 24 Sep 2021 09:21:24 -0400 Received: from mail.cn.fujitsu.com ([183.91.158.132]:11875 "EHLO heian.cn.fujitsu.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1344889AbhIXNUz (ORCPT ); Fri, 24 Sep 2021 09:20:55 -0400 IronPort-Data: A9a23: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 IronPort-HdrOrdr: A9a23:66DEF6+Sutq5zy5PPnJuk+DkI+orL9Y04lQ7vn2ZKCYlFvBw8vrCoB1173HJYUkqMk3I9ergBEDiewK4yXcW2/hzAV7KZmCP11dAR7sSj7cKrQeBJwTOssZZ1YpFN5N1EcDMCzFB5vrS0U2VFMkBzbC8nJyVuQ== X-IronPort-AV: E=Sophos;i="5.85,319,1624291200"; d="scan'208";a="114917444" Received: from unknown (HELO cn.fujitsu.com) ([10.167.33.5]) by heian.cn.fujitsu.com with ESMTP; 24 Sep 2021 21:10:18 +0800 Received: from G08CNEXMBPEKD05.g08.fujitsu.local (unknown [10.167.33.204]) by cn.fujitsu.com (Postfix) with ESMTP id A4D654D0DC7A; Fri, 24 Sep 2021 21:10:14 +0800 (CST) Received: from G08CNEXCHPEKD09.g08.fujitsu.local (10.167.33.85) by G08CNEXMBPEKD05.g08.fujitsu.local (10.167.33.204) with Microsoft SMTP Server (TLS) id 15.0.1497.23; Fri, 24 Sep 2021 21:10:16 +0800 Received: from irides.mr.mr.mr (10.167.225.141) by G08CNEXCHPEKD09.g08.fujitsu.local (10.167.33.209) with Microsoft SMTP Server id 15.0.1497.23 via Frontend Transport; Fri, 24 Sep 2021 21:10:13 +0800 From: Shiyang Ruan To: , , , , CC: , , , , Subject: [PATCH v7 2/8] dax: Introduce holder for dax_device Date: Fri, 24 Sep 2021 21:09:53 +0800 Message-ID: <20210924130959.2695749-3-ruansy.fnst@fujitsu.com> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20210924130959.2695749-1-ruansy.fnst@fujitsu.com> References: <20210924130959.2695749-1-ruansy.fnst@fujitsu.com> MIME-Version: 1.0 X-yoursite-MailScanner-ID: A4D654D0DC7A.A1C90 X-yoursite-MailScanner: Found to be clean X-yoursite-MailScanner-From: ruansy.fnst@fujitsu.com Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org To easily track filesystem from a pmem device, we introduce a holder for dax_device structure, and also its operation. This holder is used to remember who is using this dax_device: - When it is the backend of a filesystem, the holder will be the superblock of this filesystem. - When this pmem device is one of the targets in a mapped device, the holder will be this mapped device. In this case, the mapped device has its own dax_device and it will follow the first rule. So that we can finally track to the filesystem we needed. The holder and holder_ops will be set when filesystem is being mounted, or an target device is being activated. Signed-off-by: Shiyang Ruan --- drivers/dax/super.c | 59 +++++++++++++++++++++++++++++++++++++++++++++ include/linux/dax.h | 29 ++++++++++++++++++++++ 2 files changed, 88 insertions(+) diff --git a/drivers/dax/super.c b/drivers/dax/super.c index 48ce86501d93..7d4a11dcba90 100644 --- a/drivers/dax/super.c +++ b/drivers/dax/super.c @@ -23,7 +23,10 @@ * @cdev: optional character interface for "device dax" * @host: optional name for lookups where the device path is not available * @private: dax driver private data + * @holder_data: holder of a dax_device: could be filesystem or mapped device * @flags: state and boolean properties + * @ops: operations for dax_device + * @holder_ops: operations for the inner holder */ struct dax_device { struct hlist_node list; @@ -31,8 +34,10 @@ struct dax_device { struct cdev cdev; const char *host; void *private; + void *holder_data; unsigned long flags; const struct dax_operations *ops; + const struct dax_holder_operations *holder_ops; }; static dev_t dax_devt; @@ -374,6 +379,29 @@ int dax_zero_page_range(struct dax_device *dax_dev, pgoff_t pgoff, } EXPORT_SYMBOL_GPL(dax_zero_page_range); +int dax_holder_notify_failure(struct dax_device *dax_dev, loff_t offset, + size_t size, int flags) +{ + int rc; + + dax_read_lock(); + if (!dax_alive(dax_dev)) { + rc = -ENXIO; + goto out; + } + + if (!dax_dev->holder_data) { + rc = -EOPNOTSUPP; + goto out; + } + + rc = dax_dev->holder_ops->notify_failure(dax_dev, offset, size, flags); +out: + dax_read_unlock(); + return rc; +} +EXPORT_SYMBOL_GPL(dax_holder_notify_failure); + #ifdef CONFIG_ARCH_HAS_PMEM_API void arch_wb_cache_pmem(void *addr, size_t size); void dax_flush(struct dax_device *dax_dev, void *addr, size_t size) @@ -618,6 +646,37 @@ void put_dax(struct dax_device *dax_dev) } EXPORT_SYMBOL_GPL(put_dax); +void dax_set_holder(struct dax_device *dax_dev, void *holder, + const struct dax_holder_operations *ops) +{ + dax_write_lock(); + if (!dax_alive(dax_dev)) { + dax_write_unlock(); + return; + } + + dax_dev->holder_data = holder; + dax_dev->holder_ops = ops; + dax_write_unlock(); +} +EXPORT_SYMBOL_GPL(dax_set_holder); + +void *dax_get_holder(struct dax_device *dax_dev) +{ + void *holder; + + dax_read_lock(); + if (!dax_alive(dax_dev)) { + dax_read_unlock(); + return NULL; + } + + holder = dax_dev->holder_data; + dax_read_unlock(); + return holder; +} +EXPORT_SYMBOL_GPL(dax_get_holder); + /** * inode_dax: convert a public inode into its dax_dev * @inode: An inode with i_cdev pointing to a dax_dev diff --git a/include/linux/dax.h b/include/linux/dax.h index 097b3304f9b9..d273d59723cd 100644 --- a/include/linux/dax.h +++ b/include/linux/dax.h @@ -38,9 +38,24 @@ struct dax_operations { int (*zero_page_range)(struct dax_device *, pgoff_t, size_t); }; +struct dax_holder_operations { + /* + * notify_failure - notify memory failure into inner holder device + * @dax_dev: the dax device which contains the holder + * @offset: offset on this dax device where memory failure occurs + * @size: length of this memory failure event + * @flags: action flags for memory failure handler + */ + int (*notify_failure)(struct dax_device *dax_dev, loff_t offset, + size_t size, int flags); +}; + extern struct attribute_group dax_attribute_group; #if IS_ENABLED(CONFIG_DAX) +void dax_set_holder(struct dax_device *dax_dev, void *holder, + const struct dax_holder_operations *ops); +void *dax_get_holder(struct dax_device *dax_dev); struct dax_device *alloc_dax(void *private, const char *host, const struct dax_operations *ops, unsigned long flags); void put_dax(struct dax_device *dax_dev); @@ -70,6 +85,18 @@ static inline bool daxdev_mapping_supported(struct vm_area_struct *vma, return dax_synchronous(dax_dev); } #else +static inline struct dax_device *dax_get_by_host(const char *host) +{ + return NULL; +} +static inline void dax_set_holder(struct dax_device *dax_dev, void *holder, + const struct dax_holder_operations *ops) +{ +} +static inline void *dax_get_holder(struct dax_device *dax_dev) +{ + return NULL; +} static inline struct dax_device *alloc_dax(void *private, const char *host, const struct dax_operations *ops, unsigned long flags) { @@ -198,6 +225,8 @@ size_t dax_copy_to_iter(struct dax_device *dax_dev, pgoff_t pgoff, void *addr, size_t bytes, struct iov_iter *i); int dax_zero_page_range(struct dax_device *dax_dev, pgoff_t pgoff, size_t nr_pages); +int dax_holder_notify_failure(struct dax_device *dax_dev, loff_t offset, + size_t size, int flags); void dax_flush(struct dax_device *dax_dev, void *addr, size_t size); ssize_t dax_iomap_rw(struct kiocb *iocb, struct iov_iter *iter, From patchwork Fri Sep 24 13:09:54 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shiyang Ruan X-Patchwork-Id: 12515389 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3FE5DC433EF for ; Fri, 24 Sep 2021 13:19:50 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 28B9660FDC for ; Fri, 24 Sep 2021 13:19:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1345474AbhIXNVT (ORCPT ); Fri, 24 Sep 2021 09:21:19 -0400 Received: from mail.cn.fujitsu.com ([183.91.158.132]:5068 "EHLO heian.cn.fujitsu.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1344859AbhIXNUy (ORCPT ); Fri, 24 Sep 2021 09:20:54 -0400 IronPort-Data: A9a23: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 IronPort-HdrOrdr: A9a23:nz33yK8SZT2iN8yk2ZVuk+C9I+orL9Y04lQ7vn2ZKCY0TiX2ra2TdZggvyMc6wxxZJhDo7+90cC7KBu2yXcc2/hzAV7IZmXbUQWTQr1f0Q== X-IronPort-AV: E=Sophos;i="5.85,319,1624291200"; d="scan'208";a="114917442" Received: from unknown (HELO cn.fujitsu.com) ([10.167.33.5]) by heian.cn.fujitsu.com with ESMTP; 24 Sep 2021 21:10:18 +0800 Received: from G08CNEXMBPEKD06.g08.fujitsu.local (unknown [10.167.33.206]) by cn.fujitsu.com (Postfix) with ESMTP id B477D4D0DC7C; Fri, 24 Sep 2021 21:10:15 +0800 (CST) Received: from G08CNEXCHPEKD09.g08.fujitsu.local (10.167.33.85) by G08CNEXMBPEKD06.g08.fujitsu.local (10.167.33.206) with Microsoft SMTP Server (TLS) id 15.0.1497.23; Fri, 24 Sep 2021 21:10:14 +0800 Received: from irides.mr.mr.mr (10.167.225.141) by G08CNEXCHPEKD09.g08.fujitsu.local (10.167.33.209) with Microsoft SMTP Server id 15.0.1497.23 via Frontend Transport; Fri, 24 Sep 2021 21:10:14 +0800 From: Shiyang Ruan To: , , , , CC: , , , , Subject: [PATCH v7 3/8] mm: factor helpers for memory_failure_dev_pagemap Date: Fri, 24 Sep 2021 21:09:54 +0800 Message-ID: <20210924130959.2695749-4-ruansy.fnst@fujitsu.com> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20210924130959.2695749-1-ruansy.fnst@fujitsu.com> References: <20210924130959.2695749-1-ruansy.fnst@fujitsu.com> MIME-Version: 1.0 X-yoursite-MailScanner-ID: B477D4D0DC7C.A425A X-yoursite-MailScanner: Found to be clean X-yoursite-MailScanner-From: ruansy.fnst@fujitsu.com Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org memory_failure_dev_pagemap code is a bit complex before introduce RMAP feature for fsdax. So it is needed to factor some helper functions to simplify these code. Signed-off-by: Shiyang Ruan Reviewed-by: Darrick J. Wong Reviewed-by: Christoph Hellwig --- mm/memory-failure.c | 140 ++++++++++++++++++++++++-------------------- 1 file changed, 76 insertions(+), 64 deletions(-) diff --git a/mm/memory-failure.c b/mm/memory-failure.c index 54879c339024..8ff9b52823c0 100644 --- a/mm/memory-failure.c +++ b/mm/memory-failure.c @@ -1430,6 +1430,79 @@ static int try_to_split_thp_page(struct page *page, const char *msg) return 0; } +static void unmap_and_kill(struct list_head *to_kill, unsigned long pfn, + struct address_space *mapping, pgoff_t index, int flags) +{ + struct to_kill *tk; + unsigned long size = 0; + + list_for_each_entry(tk, to_kill, nd) + if (tk->size_shift) + size = max(size, 1UL << tk->size_shift); + if (size) { + /* + * Unmap the largest mapping to avoid breaking up device-dax + * mappings which are constant size. The actual size of the + * mapping being torn down is communicated in siginfo, see + * kill_proc() + */ + loff_t start = (index << PAGE_SHIFT) & ~(size - 1); + + unmap_mapping_range(mapping, start, size, 0); + } + + kill_procs(to_kill, flags & MF_MUST_KILL, false, pfn, flags); +} + +static int mf_generic_kill_procs(unsigned long long pfn, int flags, + struct dev_pagemap *pgmap) +{ + struct page *page = pfn_to_page(pfn); + LIST_HEAD(to_kill); + dax_entry_t cookie; + + /* + * Prevent the inode from being freed while we are interrogating + * the address_space, typically this would be handled by + * lock_page(), but dax pages do not use the page lock. This + * also prevents changes to the mapping of this pfn until + * poison signaling is complete. + */ + cookie = dax_lock_page(page); + if (!cookie) + return -EBUSY; + + if (hwpoison_filter(page)) + return 0; + + if (pgmap->type == MEMORY_DEVICE_PRIVATE) { + /* + * TODO: Handle HMM pages which may need coordination + * with device-side memory. + */ + return -EBUSY; + } + + /* + * Use this flag as an indication that the dax page has been + * remapped UC to prevent speculative consumption of poison. + */ + SetPageHWPoison(page); + + /* + * Unlike System-RAM there is no possibility to swap in a + * different physical page at a given virtual address, so all + * userspace consumption of ZONE_DEVICE memory necessitates + * SIGBUS (i.e. MF_MUST_KILL) + */ + flags |= MF_ACTION_REQUIRED | MF_MUST_KILL; + collect_procs(page, &to_kill, true); + + unmap_and_kill(&to_kill, pfn, page->mapping, page->index, flags); + dax_unlock_page(page, cookie); + return 0; +} + static int memory_failure_hugetlb(unsigned long pfn, int flags) { struct page *p = pfn_to_page(pfn); @@ -1519,12 +1592,8 @@ static int memory_failure_dev_pagemap(unsigned long pfn, int flags, struct dev_pagemap *pgmap) { struct page *page = pfn_to_page(pfn); - unsigned long size = 0; - struct to_kill *tk; LIST_HEAD(tokill); - int rc = -EBUSY; - loff_t start; - dax_entry_t cookie; + int rc = -ENXIO; if (flags & MF_COUNT_INCREASED) /* @@ -1533,67 +1602,10 @@ static int memory_failure_dev_pagemap(unsigned long pfn, int flags, put_page(page); /* device metadata space is not recoverable */ - if (!pgmap_pfn_valid(pgmap, pfn)) { - rc = -ENXIO; - goto out; - } - - /* - * Prevent the inode from being freed while we are interrogating - * the address_space, typically this would be handled by - * lock_page(), but dax pages do not use the page lock. This - * also prevents changes to the mapping of this pfn until - * poison signaling is complete. - */ - cookie = dax_lock_page(page); - if (!cookie) + if (!pgmap_pfn_valid(pgmap, pfn)) goto out; - if (hwpoison_filter(page)) { - rc = 0; - goto unlock; - } - - if (pgmap->type == MEMORY_DEVICE_PRIVATE) { - /* - * TODO: Handle HMM pages which may need coordination - * with device-side memory. - */ - goto unlock; - } - - /* - * Use this flag as an indication that the dax page has been - * remapped UC to prevent speculative consumption of poison. - */ - SetPageHWPoison(page); - - /* - * Unlike System-RAM there is no possibility to swap in a - * different physical page at a given virtual address, so all - * userspace consumption of ZONE_DEVICE memory necessitates - * SIGBUS (i.e. MF_MUST_KILL) - */ - flags |= MF_ACTION_REQUIRED | MF_MUST_KILL; - collect_procs(page, &tokill, flags & MF_ACTION_REQUIRED); - - list_for_each_entry(tk, &tokill, nd) - if (tk->size_shift) - size = max(size, 1UL << tk->size_shift); - if (size) { - /* - * Unmap the largest mapping to avoid breaking up - * device-dax mappings which are constant size. The - * actual size of the mapping being torn down is - * communicated in siginfo, see kill_proc() - */ - start = (page->index << PAGE_SHIFT) & ~(size - 1); - unmap_mapping_range(page->mapping, start, size, 0); - } - kill_procs(&tokill, flags & MF_MUST_KILL, false, pfn, flags); - rc = 0; -unlock: - dax_unlock_page(page, cookie); + rc = mf_generic_kill_procs(pfn, flags, pgmap); out: /* drop pgmap ref acquired in caller */ put_dev_pagemap(pgmap); From patchwork Fri Sep 24 13:09:55 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shiyang Ruan X-Patchwork-Id: 12515397 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 69863C433EF for ; Fri, 24 Sep 2021 13:20:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4C68361107 for ; Fri, 24 Sep 2021 13:20:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1346372AbhIXNVd (ORCPT ); Fri, 24 Sep 2021 09:21:33 -0400 Received: from mail.cn.fujitsu.com ([183.91.158.132]:23024 "EHLO heian.cn.fujitsu.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1345890AbhIXNVE (ORCPT ); Fri, 24 Sep 2021 09:21:04 -0400 IronPort-Data: A9a23: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 IronPort-HdrOrdr: A9a23:kCYRAqAxvwrNDcDlHelI55DYdb4zR+YMi2TC1yhKJyC9Ffbo8fxG/c5rrCMc5wxwZJhNo7y90ey7MBbhHP1OkO4s1NWZLWrbUQKTRekIh+bfKn/baknDH4VmtJuIHZIQNDSJNykZsS/l2njEL/8QhMmA7LuzhfrTi1NkTQRRYalm6AtjYzzraXFedU1XA4YjDpqA6o5irzqkQ34eacO2HT0rRO7Gzue77q7OUFoXAQI98gmSgXeN4L7+KRKR2RATSHdu7N4ZgBD4rzA= X-IronPort-AV: E=Sophos;i="5.85,319,1624291200"; d="scan'208";a="114917452" Received: from unknown (HELO cn.fujitsu.com) ([10.167.33.5]) by heian.cn.fujitsu.com with ESMTP; 24 Sep 2021 21:10:24 +0800 Received: from G08CNEXMBPEKD04.g08.fujitsu.local (unknown [10.167.33.201]) by cn.fujitsu.com (Postfix) with ESMTP id 083E74D0DC7A; Fri, 24 Sep 2021 21:10:22 +0800 (CST) Received: from G08CNEXCHPEKD09.g08.fujitsu.local (10.167.33.85) by G08CNEXMBPEKD04.g08.fujitsu.local (10.167.33.201) with Microsoft SMTP Server (TLS) id 15.0.1497.23; Fri, 24 Sep 2021 21:10:17 +0800 Received: from irides.mr.mr.mr (10.167.225.141) by G08CNEXCHPEKD09.g08.fujitsu.local (10.167.33.209) with Microsoft SMTP Server id 15.0.1497.23 via Frontend Transport; Fri, 24 Sep 2021 21:10:15 +0800 From: Shiyang Ruan To: , , , , CC: , , , , Subject: [PATCH v7 4/8] pagemap,pmem: Introduce ->memory_failure() Date: Fri, 24 Sep 2021 21:09:55 +0800 Message-ID: <20210924130959.2695749-5-ruansy.fnst@fujitsu.com> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20210924130959.2695749-1-ruansy.fnst@fujitsu.com> References: <20210924130959.2695749-1-ruansy.fnst@fujitsu.com> MIME-Version: 1.0 X-yoursite-MailScanner-ID: 083E74D0DC7A.A3E5F X-yoursite-MailScanner: Found to be clean X-yoursite-MailScanner-From: ruansy.fnst@fujitsu.com Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org When memory-failure occurs, we call this function which is implemented by each kind of devices. For the fsdax case, pmem device driver implements it. Pmem device driver will find out the filesystem in which the corrupted page located in. With dax_holder notify support, we are able to notify the memory failure from pmem driver to upper layers. If there is something not support in the notify routine, memory_failure will fall back to the generic hanlder. Signed-off-by: Shiyang Ruan Reviewed-by: Christoph Hellwig --- drivers/nvdimm/pmem.c | 11 +++++++++++ include/linux/memremap.h | 9 +++++++++ mm/memory-failure.c | 14 ++++++++++++++ 3 files changed, 34 insertions(+) diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c index 72de88ff0d30..0dfafad8fcc5 100644 --- a/drivers/nvdimm/pmem.c +++ b/drivers/nvdimm/pmem.c @@ -362,9 +362,20 @@ static void pmem_release_disk(void *__pmem) del_gendisk(pmem->disk); } +static int pmem_pagemap_memory_failure(struct dev_pagemap *pgmap, + unsigned long pfn, size_t size, int flags) +{ + struct pmem_device *pmem = + container_of(pgmap, struct pmem_device, pgmap); + loff_t offset = PFN_PHYS(pfn) - pmem->phys_addr - pmem->data_offset; + + return dax_holder_notify_failure(pmem->dax_dev, offset, size, flags); +} + static const struct dev_pagemap_ops fsdax_pagemap_ops = { .kill = pmem_pagemap_kill, .cleanup = pmem_pagemap_cleanup, + .memory_failure = pmem_pagemap_memory_failure, }; static int pmem_attach_disk(struct device *dev, diff --git a/include/linux/memremap.h b/include/linux/memremap.h index c0e9d35889e8..36d47bacd46d 100644 --- a/include/linux/memremap.h +++ b/include/linux/memremap.h @@ -87,6 +87,15 @@ struct dev_pagemap_ops { * the page back to a CPU accessible page. */ vm_fault_t (*migrate_to_ram)(struct vm_fault *vmf); + + /* + * Handle the memory failure happens on a range of pfns. Notify the + * processes who are using these pfns, and try to recover the data on + * them if necessary. The flag is finally passed to the recover + * function through the whole notify routine. + */ + int (*memory_failure)(struct dev_pagemap *pgmap, unsigned long pfn, + size_t size, int flags); }; #define PGMAP_ALTMAP_VALID (1 << 0) diff --git a/mm/memory-failure.c b/mm/memory-failure.c index 8ff9b52823c0..85eab206b68f 100644 --- a/mm/memory-failure.c +++ b/mm/memory-failure.c @@ -1605,6 +1605,20 @@ static int memory_failure_dev_pagemap(unsigned long pfn, int flags, if (!pgmap_pfn_valid(pgmap, pfn)) goto out; + /* + * Call driver's implementation to handle the memory failure, otherwise + * fall back to generic handler. + */ + if (pgmap->ops->memory_failure) { + rc = pgmap->ops->memory_failure(pgmap, pfn, PAGE_SIZE, flags); + /* + * Fall back to generic handler too if operation is not + * supported inside the driver/device/filesystem. + */ + if (rc != EOPNOTSUPP) + goto out; + } + rc = mf_generic_kill_procs(pfn, flags, pgmap); out: /* drop pgmap ref acquired in caller */ From patchwork Fri Sep 24 13:09:56 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shiyang Ruan X-Patchwork-Id: 12515395 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5D2ADC433F5 for ; Fri, 24 Sep 2021 13:19:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 490A161107 for ; Fri, 24 Sep 2021 13:19:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1345622AbhIXNVa (ORCPT ); Fri, 24 Sep 2021 09:21:30 -0400 Received: from mail.cn.fujitsu.com ([183.91.158.132]:21866 "EHLO heian.cn.fujitsu.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1345842AbhIXNVA (ORCPT ); Fri, 24 Sep 2021 09:21:00 -0400 IronPort-Data: A9a23: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 IronPort-HdrOrdr: A9a23:UxGi9qG9SUxng/CupLqEDseALOsnbusQ8zAXP0AYc31om6uj5rmTdZUgpGfJYVkqKRIdcLy7V5VoBEmskaKdgrNhW4tKPjOW2ldARbsKheCJrlHd8m/Fh4lgPMxbE5SWZuefMbEDt7ee3OCnKadd/PC3tLCvmfzFz2pgCSVja6Rb5Q9/DQqBe3cGPjVuNN4oEoaG/Mpbq36FcXQTVM6yAX4IRKztvNvO/aiWHCIuNlo27hWUlzO05PrfGxic5B0XVDRC2vMD3AH+4nfE2pk= X-IronPort-AV: E=Sophos;i="5.85,319,1624291200"; d="scan'208";a="114917451" Received: from unknown (HELO cn.fujitsu.com) ([10.167.33.5]) by heian.cn.fujitsu.com with ESMTP; 24 Sep 2021 21:10:24 +0800 Received: from G08CNEXMBPEKD06.g08.fujitsu.local (unknown [10.167.33.206]) by cn.fujitsu.com (Postfix) with ESMTP id 9CE4D4D0DC77; Fri, 24 Sep 2021 21:10:23 +0800 (CST) Received: from G08CNEXJMPEKD02.g08.fujitsu.local (10.167.33.202) by G08CNEXMBPEKD06.g08.fujitsu.local (10.167.33.206) with Microsoft SMTP Server (TLS) id 15.0.1497.23; Fri, 24 Sep 2021 21:10:22 +0800 Received: from G08CNEXCHPEKD09.g08.fujitsu.local (10.167.33.85) by G08CNEXJMPEKD02.g08.fujitsu.local (10.167.33.202) with Microsoft SMTP Server (TLS) id 15.0.1497.23; Fri, 24 Sep 2021 21:10:23 +0800 Received: from irides.mr.mr.mr (10.167.225.141) by G08CNEXCHPEKD09.g08.fujitsu.local (10.167.33.209) with Microsoft SMTP Server id 15.0.1497.23 via Frontend Transport; Fri, 24 Sep 2021 21:10:21 +0800 From: Shiyang Ruan To: , , , , CC: , , , , Subject: [PATCH v7 5/8] fsdax: Introduce dax_lock_mapping_entry() Date: Fri, 24 Sep 2021 21:09:56 +0800 Message-ID: <20210924130959.2695749-6-ruansy.fnst@fujitsu.com> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20210924130959.2695749-1-ruansy.fnst@fujitsu.com> References: <20210924130959.2695749-1-ruansy.fnst@fujitsu.com> MIME-Version: 1.0 X-yoursite-MailScanner-ID: 9CE4D4D0DC77.A2E7A X-yoursite-MailScanner: Found to be clean X-yoursite-MailScanner-From: ruansy.fnst@fujitsu.com Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org The current dax_lock_page() locks dax entry by obtaining mapping and index in page. To support 1-to-N RMAP in NVDIMM, we need a new function to lock a specific dax entry corresponding to this file's mapping,index. And BTW, output the page corresponding to the specific dax entry for caller use. Signed-off-by: Shiyang Ruan --- fs/dax.c | 65 ++++++++++++++++++++++++++++++++++++++++++++- include/linux/dax.h | 15 +++++++++++ 2 files changed, 79 insertions(+), 1 deletion(-) diff --git a/fs/dax.c b/fs/dax.c index 798c43f09eee..509b65e60478 100644 --- a/fs/dax.c +++ b/fs/dax.c @@ -390,7 +390,7 @@ static struct page *dax_busy_page(void *entry) } /* - * dax_lock_mapping_entry - Lock the DAX entry corresponding to a page + * dax_lock_page - Lock the DAX entry corresponding to a page * @page: The page whose entry we want to lock * * Context: Process context. @@ -455,6 +455,69 @@ void dax_unlock_page(struct page *page, dax_entry_t cookie) dax_unlock_entry(&xas, (void *)cookie); } +/* + * dax_lock_mapping_entry - Lock the DAX entry corresponding to a mapping + * @mapping: the file's mapping whose entry we want to lock + * @index: the offset within this file + * @page: output the dax page corresponding to this dax entry + * + * Return: A cookie to pass to dax_unlock_mapping_entry() or 0 if the entry + * could not be locked. + */ +dax_entry_t dax_lock_mapping_entry(struct address_space *mapping, pgoff_t index, + struct page **page) +{ + XA_STATE(xas, NULL, 0); + void *entry; + + rcu_read_lock(); + for (;;) { + entry = NULL; + if (!dax_mapping(mapping)) + break; + + xas.xa = &mapping->i_pages; + xas_lock_irq(&xas); + xas_set(&xas, index); + entry = xas_load(&xas); + if (dax_is_locked(entry)) { + rcu_read_unlock(); + wait_entry_unlocked(&xas, entry); + rcu_read_lock(); + continue; + } + if (!entry || + dax_is_zero_entry(entry) || dax_is_empty_entry(entry)) { + /* + * Because we are looking for entry from file's mapping + * and index, so the entry may not be inserted for now, + * or even a zero/empty entry. We don't think this is + * an error case. So, return a special value and do + * not output @page. + */ + entry = (void *)~0UL; + } else { + *page = pfn_to_page(dax_to_pfn(entry)); + dax_lock_entry(&xas, entry); + } + xas_unlock_irq(&xas); + break; + } + rcu_read_unlock(); + return (dax_entry_t)entry; +} + +void dax_unlock_mapping_entry(struct address_space *mapping, pgoff_t index, + dax_entry_t cookie) +{ + XA_STATE(xas, &mapping->i_pages, index); + + if (cookie == ~0UL) + return; + + dax_unlock_entry(&xas, (void *)cookie); +} + /* * Find page cache entry at given index. If it is a DAX entry, return it * with the entry locked. If the page cache doesn't contain an entry at diff --git a/include/linux/dax.h b/include/linux/dax.h index d273d59723cd..65411bee4312 100644 --- a/include/linux/dax.h +++ b/include/linux/dax.h @@ -156,6 +156,10 @@ struct page *dax_layout_busy_page(struct address_space *mapping); struct page *dax_layout_busy_page_range(struct address_space *mapping, loff_t start, loff_t end); dax_entry_t dax_lock_page(struct page *page); void dax_unlock_page(struct page *page, dax_entry_t cookie); +dax_entry_t dax_lock_mapping_entry(struct address_space *mapping, + unsigned long index, struct page **page); +void dax_unlock_mapping_entry(struct address_space *mapping, + unsigned long index, dax_entry_t cookie); #else #define generic_fsdax_supported NULL @@ -201,6 +205,17 @@ static inline dax_entry_t dax_lock_page(struct page *page) static inline void dax_unlock_page(struct page *page, dax_entry_t cookie) { } + +static inline dax_entry_t dax_lock_mapping_entry(struct address_space *mapping, + unsigned long index, struct page **page) +{ + return 0; +} + +static inline void dax_unlock_mapping_entry(struct address_space *mapping, + unsigned long index, dax_entry_t cookie) +{ +} #endif #if IS_ENABLED(CONFIG_DAX) From patchwork Fri Sep 24 13:09:57 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shiyang Ruan X-Patchwork-Id: 12515399 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 38FC7C433EF for ; Fri, 24 Sep 2021 13:20:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 244A261019 for ; Fri, 24 Sep 2021 13:20:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1345957AbhIXNVo (ORCPT ); Fri, 24 Sep 2021 09:21:44 -0400 Received: from mail.cn.fujitsu.com ([183.91.158.132]:45104 "EHLO heian.cn.fujitsu.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1345993AbhIXNVI (ORCPT ); Fri, 24 Sep 2021 09:21:08 -0400 IronPort-Data: A9a23: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 IronPort-HdrOrdr: A9a23:xKatbqiOV12Qtb7XlqI+vFXdQXBQXj4ji2hC6mlwRA09TySZ//rBoB19726TtN9xYgBYpTnuAsm9qB/nmaKdpLNhWItKPzOW31dATrsSjrcKqgeIc0aVm9K1l50QF5SWY+eQMbEVt6nHCXGDYrQdKce8gd2VrNab33FwVhtrdq0lyw94DzyQGkpwSBIuP+tDKLOsotpAuyG7eWkaKuCyBnw+VeDFoNHR0L38ZxpuPW9c1CC+ySOv9KXhEwWVmjMXUzZ0y78k9mTf1yzVj5/Ty82G9g== X-IronPort-AV: E=Sophos;i="5.85,319,1624291200"; d="scan'208";a="114917457" Received: from unknown (HELO cn.fujitsu.com) ([10.167.33.5]) by heian.cn.fujitsu.com with ESMTP; 24 Sep 2021 21:10:30 +0800 Received: from G08CNEXMBPEKD05.g08.fujitsu.local (unknown [10.167.33.204]) by cn.fujitsu.com (Postfix) with ESMTP id 14FE94CE84EF; Fri, 24 Sep 2021 21:10:24 +0800 (CST) Received: from G08CNEXCHPEKD09.g08.fujitsu.local (10.167.33.85) by G08CNEXMBPEKD05.g08.fujitsu.local (10.167.33.204) with Microsoft SMTP Server (TLS) id 15.0.1497.23; Fri, 24 Sep 2021 21:10:25 +0800 Received: from irides.mr.mr.mr (10.167.225.141) by G08CNEXCHPEKD09.g08.fujitsu.local (10.167.33.209) with Microsoft SMTP Server id 15.0.1497.23 via Frontend Transport; Fri, 24 Sep 2021 21:10:22 +0800 From: Shiyang Ruan To: , , , , CC: , , , , Subject: [PATCH v7 6/8] mm: Introduce mf_dax_kill_procs() for fsdax case Date: Fri, 24 Sep 2021 21:09:57 +0800 Message-ID: <20210924130959.2695749-7-ruansy.fnst@fujitsu.com> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20210924130959.2695749-1-ruansy.fnst@fujitsu.com> References: <20210924130959.2695749-1-ruansy.fnst@fujitsu.com> MIME-Version: 1.0 X-yoursite-MailScanner-ID: 14FE94CE84EF.A71B8 X-yoursite-MailScanner: Found to be clean X-yoursite-MailScanner-From: ruansy.fnst@fujitsu.com Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org This function is called at the end of RMAP routine, i.e. filesystem recovery function, to collect and kill processes using a shared page of DAX file. The difference between mf_generic_kill_procs() is, it accepts file's mapping,offset instead of struct page. Because different file's mappings and offsets may share the same page in fsdax mode. So, it is called when filesystem RMAP results are found. Signed-off-by: Shiyang Ruan --- fs/dax.c | 10 ------ include/linux/dax.h | 9 +++++ include/linux/mm.h | 2 ++ mm/memory-failure.c | 83 ++++++++++++++++++++++++++++++++++++++++----- 4 files changed, 86 insertions(+), 18 deletions(-) diff --git a/fs/dax.c b/fs/dax.c index 509b65e60478..2536c105ec7f 100644 --- a/fs/dax.c +++ b/fs/dax.c @@ -852,16 +852,6 @@ static void *dax_insert_entry(struct xa_state *xas, return entry; } -static inline -unsigned long pgoff_address(pgoff_t pgoff, struct vm_area_struct *vma) -{ - unsigned long address; - - address = vma->vm_start + ((pgoff - vma->vm_pgoff) << PAGE_SHIFT); - VM_BUG_ON_VMA(address < vma->vm_start || address >= vma->vm_end, vma); - return address; -} - /* Walk all mappings of a given index of a file and writeprotect them */ static void dax_entry_mkclean(struct address_space *mapping, pgoff_t index, unsigned long pfn) diff --git a/include/linux/dax.h b/include/linux/dax.h index 65411bee4312..3d90becbd160 100644 --- a/include/linux/dax.h +++ b/include/linux/dax.h @@ -258,6 +258,15 @@ static inline bool dax_mapping(struct address_space *mapping) { return mapping->host && IS_DAX(mapping->host); } +static inline unsigned long pgoff_address(pgoff_t pgoff, + struct vm_area_struct *vma) +{ + unsigned long address; + + address = vma->vm_start + ((pgoff - vma->vm_pgoff) << PAGE_SHIFT); + VM_BUG_ON_VMA(address < vma->vm_start || address >= vma->vm_end, vma); + return address; +} #ifdef CONFIG_DEV_DAX_HMEM_DEVICES void hmem_register_device(int target_nid, struct resource *r); diff --git a/include/linux/mm.h b/include/linux/mm.h index 73a52aba448f..d06af0051e53 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -3114,6 +3114,8 @@ enum mf_flags { MF_MUST_KILL = 1 << 2, MF_SOFT_OFFLINE = 1 << 3, }; +extern int mf_dax_kill_procs(struct address_space *mapping, pgoff_t index, + size_t size, int flags); extern int memory_failure(unsigned long pfn, int flags); extern void memory_failure_queue(unsigned long pfn, int flags); extern void memory_failure_queue_kick(int cpu); diff --git a/mm/memory-failure.c b/mm/memory-failure.c index 85eab206b68f..a9d0d487d205 100644 --- a/mm/memory-failure.c +++ b/mm/memory-failure.c @@ -302,10 +302,9 @@ void shake_page(struct page *p) } EXPORT_SYMBOL_GPL(shake_page); -static unsigned long dev_pagemap_mapping_shift(struct page *page, +static unsigned long dev_pagemap_mapping_shift(unsigned long address, struct vm_area_struct *vma) { - unsigned long address = vma_address(page, vma); pgd_t *pgd; p4d_t *p4d; pud_t *pud; @@ -345,7 +344,7 @@ static unsigned long dev_pagemap_mapping_shift(struct page *page, * Schedule a process for later kill. * Uses GFP_ATOMIC allocations to avoid potential recursions in the VM. */ -static void add_to_kill(struct task_struct *tsk, struct page *p, +static void add_to_kill(struct task_struct *tsk, struct page *p, pgoff_t pgoff, struct vm_area_struct *vma, struct list_head *to_kill) { @@ -358,9 +357,15 @@ static void add_to_kill(struct task_struct *tsk, struct page *p, } tk->addr = page_address_in_vma(p, vma); - if (is_zone_device_page(p)) - tk->size_shift = dev_pagemap_mapping_shift(p, vma); - else + if (is_zone_device_page(p)) { + /* + * Since page->mapping is no more used for fsdax, we should + * calculate the address in a fsdax way. + */ + if (p->pgmap->type == MEMORY_DEVICE_FS_DAX) + tk->addr = pgoff_address(pgoff, vma); + tk->size_shift = dev_pagemap_mapping_shift(tk->addr, vma); + } else tk->size_shift = page_shift(compound_head(p)); /* @@ -508,7 +513,7 @@ static void collect_procs_anon(struct page *page, struct list_head *to_kill, if (!page_mapped_in_vma(page, vma)) continue; if (vma->vm_mm == t->mm) - add_to_kill(t, page, vma, to_kill); + add_to_kill(t, page, 0, vma, to_kill); } } read_unlock(&tasklist_lock); @@ -544,7 +549,32 @@ static void collect_procs_file(struct page *page, struct list_head *to_kill, * to be informed of all such data corruptions. */ if (vma->vm_mm == t->mm) - add_to_kill(t, page, vma, to_kill); + add_to_kill(t, page, 0, vma, to_kill); + } + } + read_unlock(&tasklist_lock); + i_mmap_unlock_read(mapping); +} + +/* + * Collect processes when the error hit a fsdax page. + */ +static void collect_procs_fsdax(struct page *page, struct address_space *mapping, + pgoff_t pgoff, struct list_head *to_kill) +{ + struct vm_area_struct *vma; + struct task_struct *tsk; + + i_mmap_lock_read(mapping); + read_lock(&tasklist_lock); + for_each_process(tsk) { + struct task_struct *t = task_early_kill(tsk, true); + + if (!t) + continue; + vma_interval_tree_foreach(vma, &mapping->i_mmap, pgoff, pgoff) { + if (vma->vm_mm == t->mm) + add_to_kill(t, page, pgoff, vma, to_kill); } } read_unlock(&tasklist_lock); @@ -1503,6 +1533,43 @@ static int mf_generic_kill_procs(unsigned long long pfn, int flags, return 0; } +/** + * mf_dax_kill_procs - Collect and kill processes who are using this file range + * @mapping: the file in use + * @index: start offset of the range + * @size: length of the range + * @flags: memory failure flags + */ +int mf_dax_kill_procs(struct address_space *mapping, pgoff_t index, + size_t size, int flags) +{ + LIST_HEAD(to_kill); + dax_entry_t cookie; + struct page *page; + size_t end = (index << PAGE_SHIFT) + size; + + flags |= MF_ACTION_REQUIRED | MF_MUST_KILL; + + for (; (index << PAGE_SHIFT) < end; index++) { + page = NULL; + cookie = dax_lock_mapping_entry(mapping, index, &page); + if (!cookie) + return -EBUSY; + if (!page) + goto unlock; + + SetPageHWPoison(page); + + collect_procs_fsdax(page, mapping, index, &to_kill); + unmap_and_kill(&to_kill, page_to_pfn(page), mapping, + index, flags); +unlock: + dax_unlock_mapping_entry(mapping, index, cookie); + } + return 0; +} +EXPORT_SYMBOL_GPL(mf_dax_kill_procs); + static int memory_failure_hugetlb(unsigned long pfn, int flags) { struct page *p = pfn_to_page(pfn); From patchwork Fri Sep 24 13:09:58 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shiyang Ruan X-Patchwork-Id: 12515401 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0DA49C433F5 for ; Fri, 24 Sep 2021 13:20:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E293C61019 for ; Fri, 24 Sep 2021 13:20:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1345308AbhIXNVu (ORCPT ); Fri, 24 Sep 2021 09:21:50 -0400 Received: from mail.cn.fujitsu.com ([183.91.158.132]:11373 "EHLO heian.cn.fujitsu.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1346009AbhIXNVI (ORCPT ); Fri, 24 Sep 2021 09:21:08 -0400 IronPort-Data: A9a23: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 IronPort-HdrOrdr: A9a23:3g0GUK+B7SX+fB9Pg89uk+A8I+orL9Y04lQ7vn2YSXRuHPBw8Pre+sjztCWE8Qr5N0tBpTntAsW9qDbnhPtICOoqTNCftWvdyQiVxehZhOOIqVDd8m/Fh4pgPMxbEpSWZueeMbEDt7eZ3OCnKadc/PC3tLCvmfzFz2pgCSVja6Rb5Q9/DQqBe3cGPzVuNN4oEoaG/Mpbq36FcXQTVM6yAX4IRKztvNvO/aiWGyIuNlo27hWUlzO05PrfGxic5B0XVDRC2vMD3AH+4nTE2pk= X-IronPort-AV: E=Sophos;i="5.85,319,1624291200"; d="scan'208";a="114917461" Received: from unknown (HELO cn.fujitsu.com) ([10.167.33.5]) by heian.cn.fujitsu.com with ESMTP; 24 Sep 2021 21:10:36 +0800 Received: from G08CNEXMBPEKD05.g08.fujitsu.local (unknown [10.167.33.204]) by cn.fujitsu.com (Postfix) with ESMTP id 5E28D4D0DC77; Fri, 24 Sep 2021 21:10:30 +0800 (CST) Received: from G08CNEXCHPEKD09.g08.fujitsu.local (10.167.33.85) by G08CNEXMBPEKD05.g08.fujitsu.local (10.167.33.204) with Microsoft SMTP Server (TLS) id 15.0.1497.23; Fri, 24 Sep 2021 21:10:26 +0800 Received: from irides.mr.mr.mr (10.167.225.141) by G08CNEXCHPEKD09.g08.fujitsu.local (10.167.33.209) with Microsoft SMTP Server id 15.0.1497.23 via Frontend Transport; Fri, 24 Sep 2021 21:10:23 +0800 From: Shiyang Ruan To: , , , , CC: , , , , Subject: [PATCH v7 7/8] xfs: Implement ->notify_failure() for XFS Date: Fri, 24 Sep 2021 21:09:58 +0800 Message-ID: <20210924130959.2695749-8-ruansy.fnst@fujitsu.com> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20210924130959.2695749-1-ruansy.fnst@fujitsu.com> References: <20210924130959.2695749-1-ruansy.fnst@fujitsu.com> MIME-Version: 1.0 X-yoursite-MailScanner-ID: 5E28D4D0DC77.A27F1 X-yoursite-MailScanner: Found to be clean X-yoursite-MailScanner-From: ruansy.fnst@fujitsu.com Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org This function is used to handle errors which may cause data lost in filesystem. Such as memory failure in fsdax mode. If the rmap feature of XFS enabled, we can query it to find files and metadata which are associated with the corrupt data. For now all we do is kill processes with that file mapped into their address spaces, but future patches could actually do something about corrupt metadata. After that, the memory failure needs to notify the processes who are using those files. Signed-off-by: Shiyang Ruan --- drivers/dax/super.c | 19 +++++ fs/xfs/xfs_fsops.c | 3 + fs/xfs/xfs_mount.h | 1 + fs/xfs/xfs_super.c | 188 ++++++++++++++++++++++++++++++++++++++++++++ include/linux/dax.h | 18 +++++ 5 files changed, 229 insertions(+) diff --git a/drivers/dax/super.c b/drivers/dax/super.c index 7d4a11dcba90..22091e7fb0ef 100644 --- a/drivers/dax/super.c +++ b/drivers/dax/super.c @@ -135,6 +135,25 @@ struct dax_device *fs_dax_get_by_bdev(struct block_device *bdev) } EXPORT_SYMBOL_GPL(fs_dax_get_by_bdev); +void fs_dax_register_holder(struct dax_device *dax_dev, void *holder, + const struct dax_holder_operations *ops) +{ + dax_set_holder(dax_dev, holder, ops); +} +EXPORT_SYMBOL_GPL(fs_dax_register_holder); + +void fs_dax_unregister_holder(struct dax_device *dax_dev) +{ + dax_set_holder(dax_dev, NULL, NULL); +} +EXPORT_SYMBOL_GPL(fs_dax_unregister_holder); + +void *fs_dax_get_holder(struct dax_device *dax_dev) +{ + return dax_get_holder(dax_dev); +} +EXPORT_SYMBOL_GPL(fs_dax_get_holder); + bool generic_fsdax_supported(struct dax_device *dax_dev, struct block_device *bdev, int blocksize, sector_t start, sector_t sectors) diff --git a/fs/xfs/xfs_fsops.c b/fs/xfs/xfs_fsops.c index 33e26690a8c4..4c2d3d4ca5a5 100644 --- a/fs/xfs/xfs_fsops.c +++ b/fs/xfs/xfs_fsops.c @@ -542,6 +542,9 @@ xfs_do_force_shutdown( } else if (flags & SHUTDOWN_CORRUPT_INCORE) { tag = XFS_PTAG_SHUTDOWN_CORRUPT; why = "Corruption of in-memory data"; + } else if (flags & SHUTDOWN_CORRUPT_META) { + tag = XFS_PTAG_SHUTDOWN_CORRUPT; + why = "Corruption of on-disk metadata"; } else { tag = XFS_PTAG_SHUTDOWN_IOERROR; why = "Metadata I/O Error"; diff --git a/fs/xfs/xfs_mount.h b/fs/xfs/xfs_mount.h index e091f3b3fa15..d0f6da23e3df 100644 --- a/fs/xfs/xfs_mount.h +++ b/fs/xfs/xfs_mount.h @@ -434,6 +434,7 @@ void xfs_do_force_shutdown(struct xfs_mount *mp, int flags, char *fname, #define SHUTDOWN_LOG_IO_ERROR 0x0002 /* write attempt to the log failed */ #define SHUTDOWN_FORCE_UMOUNT 0x0004 /* shutdown from a forced unmount */ #define SHUTDOWN_CORRUPT_INCORE 0x0008 /* corrupt in-memory data structures */ +#define SHUTDOWN_CORRUPT_META 0x0010 /* corrupt metadata on device */ #define XFS_SHUTDOWN_STRINGS \ { SHUTDOWN_META_IO_ERROR, "metadata_io" }, \ diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c index c4e0cd1c1c8c..46fdf44b5ec2 100644 --- a/fs/xfs/xfs_super.c +++ b/fs/xfs/xfs_super.c @@ -37,11 +37,19 @@ #include "xfs_reflink.h" #include "xfs_pwork.h" #include "xfs_ag.h" +#include "xfs_alloc.h" +#include "xfs_rmap.h" +#include "xfs_rmap_btree.h" +#include "xfs_rtalloc.h" +#include "xfs_bit.h" #include #include #include +#include +#include +static const struct dax_holder_operations xfs_dax_holder_operations; static const struct super_operations xfs_super_operations; static struct kset *xfs_kset; /* top-level xfs sysfs dir */ @@ -377,6 +385,8 @@ xfs_close_devices( xfs_free_buftarg(mp->m_logdev_targp); xfs_blkdev_put(logdev); + if (dax_logdev) + fs_dax_unregister_holder(dax_logdev); fs_put_dax(dax_logdev); } if (mp->m_rtdev_targp) { @@ -385,9 +395,13 @@ xfs_close_devices( xfs_free_buftarg(mp->m_rtdev_targp); xfs_blkdev_put(rtdev); + if (dax_rtdev) + fs_dax_unregister_holder(dax_rtdev); fs_put_dax(dax_rtdev); } xfs_free_buftarg(mp->m_ddev_targp); + if (dax_ddev) + fs_dax_unregister_holder(dax_ddev); fs_put_dax(dax_ddev); } @@ -411,6 +425,9 @@ xfs_open_devices( struct block_device *logdev = NULL, *rtdev = NULL; int error; + if (dax_ddev) + fs_dax_register_holder(dax_ddev, mp, + &xfs_dax_holder_operations); /* * Open real time and log devices - order is important. */ @@ -419,6 +436,9 @@ xfs_open_devices( if (error) goto out; dax_logdev = fs_dax_get_by_bdev(logdev); + if (dax_logdev != dax_ddev && dax_logdev) + fs_dax_register_holder(dax_logdev, mp, + &xfs_dax_holder_operations); } if (mp->m_rtname) { @@ -433,6 +453,9 @@ xfs_open_devices( goto out_close_rtdev; } dax_rtdev = fs_dax_get_by_bdev(rtdev); + if (dax_rtdev) + fs_dax_register_holder(dax_rtdev, mp, + &xfs_dax_holder_operations); } /* @@ -1110,6 +1133,171 @@ xfs_fs_free_cached_objects( return xfs_reclaim_inodes_nr(XFS_M(sb), sc->nr_to_scan); } +struct notify_failure_info { + xfs_agblock_t startblock; + xfs_filblks_t blockcount; + int flags; +}; + +static loff_t +xfs_notify_failure_start( + struct xfs_mount *mp, + const struct xfs_rmap_irec *rec, + const struct notify_failure_info *notify) +{ + loff_t start = rec->rm_offset; + + if (notify->startblock > rec->rm_startblock) + start += XFS_FSB_TO_B(mp, + notify->startblock - rec->rm_startblock); + return start; +} + +static size_t +xfs_notify_failure_size( + struct xfs_mount *mp, + const struct xfs_rmap_irec *rec, + const struct notify_failure_info *notify) +{ + xfs_agblock_t rec_start = rec->rm_startblock; + xfs_agblock_t rec_end = rec->rm_startblock + rec->rm_blockcount; + xfs_agblock_t notify_start = notify->startblock; + xfs_agblock_t notify_end = notify->startblock + notify->blockcount; + xfs_agblock_t cross_start = max(rec_start, notify_start); + xfs_agblock_t cross_end = min(rec_end, notify_end); + + return XFS_FSB_TO_B(mp, cross_end - cross_start); +} + +static int +xfs_dax_notify_failure_fn( + struct xfs_btree_cur *cur, + const struct xfs_rmap_irec *rec, + void *data) +{ + struct xfs_mount *mp = cur->bc_mp; + struct xfs_inode *ip; + struct address_space *mapping; + struct notify_failure_info *notify = data; + int error = 0; + + if (XFS_RMAP_NON_INODE_OWNER(rec->rm_owner) || + (rec->rm_flags & (XFS_RMAP_ATTR_FORK | XFS_RMAP_BMBT_BLOCK))) { + // TODO check and try to fix metadata + xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_META); + return -EFSCORRUPTED; + } + + /* Get files that incore, filter out others that are not in use. */ + error = xfs_iget(mp, cur->bc_tp, rec->rm_owner, XFS_IGET_INCORE, + 0, &ip); + if (error) + return error; + + mapping = VFS_I(ip)->i_mapping; + if (IS_ENABLED(CONFIG_MEMORY_FAILURE)) { + loff_t offset = xfs_notify_failure_start(mp, rec, notify); + size_t size = xfs_notify_failure_size(mp, rec, notify); + + error = mf_dax_kill_procs(mapping, offset >> PAGE_SHIFT, size, + notify->flags); + } + // TODO try to fix data + xfs_irele(ip); + + return error; +} + +static loff_t +xfs_dax_bdev_offset( + struct xfs_mount *mp, + struct dax_device *dax_dev, + loff_t disk_offset) +{ + struct block_device *bdev; + + if (mp->m_ddev_targp->bt_daxdev == dax_dev) + bdev = mp->m_ddev_targp->bt_bdev; + else if (mp->m_logdev_targp->bt_daxdev == dax_dev) + bdev = mp->m_logdev_targp->bt_bdev; + else + bdev = mp->m_rtdev_targp->bt_bdev; + + return disk_offset - (get_start_sect(bdev) << SECTOR_SHIFT); +} + +static int +xfs_dax_notify_failure( + struct dax_device *dax_dev, + loff_t offset, + size_t len, + int flags) +{ + struct xfs_mount *mp = fs_dax_get_holder(dax_dev); + struct xfs_trans *tp = NULL; + struct xfs_btree_cur *cur = NULL; + struct xfs_buf *agf_bp = NULL; + struct xfs_rmap_irec rmap_low, rmap_high; + loff_t bdev_offset = xfs_dax_bdev_offset(mp, dax_dev, + offset); + xfs_fsblock_t fsbno = XFS_B_TO_FSB(mp, bdev_offset); + xfs_agnumber_t agno = XFS_FSB_TO_AGNO(mp, fsbno); + int error = 0; + struct notify_failure_info notify = { + .startblock = XFS_FSB_TO_AGBNO(mp, fsbno), + .blockcount = XFS_B_TO_FSB(mp, len), + .flags = flags, + }; + + if (mp->m_rtdev_targp && mp->m_rtdev_targp->bt_daxdev == dax_dev) { + xfs_warn(mp, + "notify_failure() not supported on realtime device!"); + return -EOPNOTSUPP; + } + + if (mp->m_logdev_targp && mp->m_logdev_targp->bt_daxdev == dax_dev && + mp->m_logdev_targp != mp->m_ddev_targp) { + xfs_err(mp, "ondisk log corrupt, shutting down fs!"); + xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_META); + return -EFSCORRUPTED; + } + + if (!xfs_has_rmapbt(mp)) { + xfs_warn(mp, "notify_failure() needs rmapbt enabled!"); + return -EOPNOTSUPP; + } + + error = xfs_trans_alloc_empty(mp, &tp); + if (error) + return error; + + error = xfs_alloc_read_agf(mp, tp, agno, 0, &agf_bp); + if (error) + goto out_cancel_tp; + + cur = xfs_rmapbt_init_cursor(mp, tp, agf_bp, agf_bp->b_pag); + + /* Construct a range for rmap query */ + memset(&rmap_low, 0, sizeof(rmap_low)); + memset(&rmap_high, 0xFF, sizeof(rmap_high)); + rmap_low.rm_startblock = rmap_high.rm_startblock = notify.startblock; + rmap_low.rm_blockcount = rmap_high.rm_blockcount = notify.blockcount; + + error = xfs_rmap_query_range(cur, &rmap_low, &rmap_high, + xfs_dax_notify_failure_fn, ¬ify); + + xfs_btree_del_cursor(cur, error); + xfs_trans_brelse(tp, agf_bp); + +out_cancel_tp: + xfs_trans_cancel(tp); + return error; +} + +static const struct dax_holder_operations xfs_dax_holder_operations = { + .notify_failure = xfs_dax_notify_failure, +}; + static const struct super_operations xfs_super_operations = { .alloc_inode = xfs_fs_alloc_inode, .destroy_inode = xfs_fs_destroy_inode, diff --git a/include/linux/dax.h b/include/linux/dax.h index 3d90becbd160..0f1fa7a4a616 100644 --- a/include/linux/dax.h +++ b/include/linux/dax.h @@ -149,6 +149,10 @@ static inline void fs_put_dax(struct dax_device *dax_dev) } struct dax_device *fs_dax_get_by_bdev(struct block_device *bdev); +void fs_dax_register_holder(struct dax_device *dax_dev, void *holder, + const struct dax_holder_operations *ops); +void fs_dax_unregister_holder(struct dax_device *dax_dev); +void *fs_dax_get_holder(struct dax_device *dax_dev); int dax_writeback_mapping_range(struct address_space *mapping, struct dax_device *dax_dev, struct writeback_control *wbc); @@ -179,6 +183,20 @@ static inline struct dax_device *fs_dax_get_by_bdev(struct block_device *bdev) return NULL; } +static inline void fs_dax_register_holder(struct dax_device *dax_dev, + void *holder, const struct dax_holder_operations *ops) +{ +} + +static inline void fs_dax_unregister_holder(struct dax_device *dax_dev) +{ +} + +static inline void *fs_dax_get_holder(struct dax_device *dax_dev) +{ + return NULL; +} + static inline struct page *dax_layout_busy_page(struct address_space *mapping) { return NULL; From patchwork Fri Sep 24 13:09:59 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shiyang Ruan X-Patchwork-Id: 12515403 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id E8797C433FE for ; Fri, 24 Sep 2021 13:20:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D185B610CF for ; Fri, 24 Sep 2021 13:20:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1345506AbhIXNVv (ORCPT ); Fri, 24 Sep 2021 09:21:51 -0400 Received: from mail.cn.fujitsu.com ([183.91.158.132]:23313 "EHLO heian.cn.fujitsu.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1345998AbhIXNVK (ORCPT ); Fri, 24 Sep 2021 09:21:10 -0400 IronPort-Data: A9a23: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 IronPort-HdrOrdr: A9a23:aIlSO69HK9edoMdmVB5uk+A+I+orL9Y04lQ7vn2YSXRuE/Bw8Pre5cjztCWE8Ar5N0tQ+uxoVJPufZqYz+8Q3WBzB8bFYOCFghrLEGgK1+KLqFeMdxEWtNQtspuIGJIfNDSfNzZHZL7BkWyF+sgbsaW62ZHtleHD1G1sUA0vT6lh6j1yAgGdHlYefng9ObMJUIqb+tFcpyetPVAebsGADHEDWOTZ4/LRkpaOW296OzcXrBmJkSiz6KP3VzyR3hIlWTtJxrs4tUjp+jaJnZmejw== X-IronPort-AV: E=Sophos;i="5.85,319,1624291200"; d="scan'208";a="114917460" Received: from unknown (HELO cn.fujitsu.com) ([10.167.33.5]) by heian.cn.fujitsu.com with ESMTP; 24 Sep 2021 21:10:36 +0800 Received: from G08CNEXMBPEKD05.g08.fujitsu.local (unknown [10.167.33.204]) by cn.fujitsu.com (Postfix) with ESMTP id E286D4CE84EF; Fri, 24 Sep 2021 21:10:31 +0800 (CST) Received: from G08CNEXJMPEKD02.g08.fujitsu.local (10.167.33.202) by G08CNEXMBPEKD05.g08.fujitsu.local (10.167.33.204) with Microsoft SMTP Server (TLS) id 15.0.1497.23; Fri, 24 Sep 2021 21:10:33 +0800 Received: from G08CNEXCHPEKD09.g08.fujitsu.local (10.167.33.85) by G08CNEXJMPEKD02.g08.fujitsu.local (10.167.33.202) with Microsoft SMTP Server (TLS) id 15.0.1497.23; Fri, 24 Sep 2021 21:10:32 +0800 Received: from irides.mr.mr.mr (10.167.225.141) by G08CNEXCHPEKD09.g08.fujitsu.local (10.167.33.209) with Microsoft SMTP Server id 15.0.1497.23 via Frontend Transport; Fri, 24 Sep 2021 21:10:30 +0800 From: Shiyang Ruan To: , , , , CC: , , , , Subject: [PATCH v7 8/8] fsdax: add exception for reflinked files Date: Fri, 24 Sep 2021 21:09:59 +0800 Message-ID: <20210924130959.2695749-9-ruansy.fnst@fujitsu.com> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20210924130959.2695749-1-ruansy.fnst@fujitsu.com> References: <20210924130959.2695749-1-ruansy.fnst@fujitsu.com> MIME-Version: 1.0 X-yoursite-MailScanner-ID: E286D4CE84EF.A4154 X-yoursite-MailScanner: Found to be clean X-yoursite-MailScanner-From: ruansy.fnst@fujitsu.com Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org For reflinked files, one dax page may be associated more than once with different fime mapping and index. It will report warning. Now, since we have introduced dax-RMAP for this case and also have to keep its functionality for other filesystems who are not support rmap, I add this exception here. Signed-off-by: Shiyang Ruan --- fs/dax.c | 14 ++++++++------ 1 file changed, 8 insertions(+), 6 deletions(-) diff --git a/fs/dax.c b/fs/dax.c index 2536c105ec7f..1a57211b1bc9 100644 --- a/fs/dax.c +++ b/fs/dax.c @@ -352,9 +352,10 @@ static void dax_associate_entry(void *entry, struct address_space *mapping, for_each_mapped_pfn(entry, pfn) { struct page *page = pfn_to_page(pfn); - WARN_ON_ONCE(page->mapping); - page->mapping = mapping; - page->index = index + i++; + if (!page->mapping) { + page->mapping = mapping; + page->index = index + i++; + } } } @@ -370,9 +371,10 @@ static void dax_disassociate_entry(void *entry, struct address_space *mapping, struct page *page = pfn_to_page(pfn); WARN_ON_ONCE(trunc && page_ref_count(page) > 1); - WARN_ON_ONCE(page->mapping && page->mapping != mapping); - page->mapping = NULL; - page->index = 0; + if (page->mapping == mapping) { + page->mapping = NULL; + page->index = 0; + } } }