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Wong" , Ted Tso , Dave Chinner , Matthew Wilcox , , , linux-f2fs-devel@lists.sourceforge.net, linux-cifs@vger.kernel.org, ceph-devel@vger.kernel.org, Jan Kara , Jeff Layton Subject: [PATCH 13/14] ceph: Fix race between hole punch and page fault Date: Mon, 12 Jul 2021 18:56:04 +0200 Message-Id: <20210712165609.13215-13-jack@suse.cz> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20210712163901.29514-1-jack@suse.cz> References: <20210712163901.29514-1-jack@suse.cz> MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=2465; h=from:subject; bh=YtbsQ0zyJQcvofUJ0OfZKBGWEvBnT2OBf1X3WQMmS78=; b=owEBbQGS/pANAwAIAZydqgc/ZEDZAcsmYgBg7HQkAjeBC3GigbXzTaUkkhsP7h/tHN+6ua4RThYv n77PQ8aJATMEAAEIAB0WIQSrWdEr1p4yirVVKBycnaoHP2RA2QUCYOx0JAAKCRCcnaoHP2RA2dqDCA DMUmz3eKJXbKKMC35HDOwmLy0OWr2Q8JYrx2Zz9UI2uWVgU2WhLn/rATSlXPJNOvCBhNAHNerq4wgy 7PpwNJ+yrODpsPqO9TtPc9TkVC09gzyMEBd7zFvNwNo1HSBgCVqkhQDsIsoQ5qYKhnwXBcwUfe/jAG OrGz+CGinBfxWyd84sxZK5OI0xEsc+l1VRkwKNZvv3KZkwMMU2svJg7cL9j9hj9YAxiLuU5ZW8QGZ1 y6+a4hpeY6Y2uHEbvy2hQDJINGnW0A2SLcRYSknpM1/xzmH9sXxuLWPXAHMMnoILkmldGX6mMn95IT DMYouVz+KM3O+Gd6ROohEGhW/OH/mN X-Developer-Key: i=jack@suse.cz; a=openpgp; fpr=93C6099A142276A28BBE35D815BC833443038D8C Authentication-Results: imf03.hostedemail.com; dkim=pass header.d=suse.cz header.s=susede2_rsa header.b=iTYcqzKz; dkim=pass header.d=suse.cz header.s=susede2_ed25519 header.b=TnUFj81r; spf=pass (imf03.hostedemail.com: domain of jack@suse.cz designates 195.135.220.29 as permitted sender) smtp.mailfrom=jack@suse.cz; dmarc=none X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: 72B7430002DA X-Stat-Signature: ma1mfxt7i6sgugbedcokszw8wmm77ws6 X-HE-Tag: 1626108972-366203 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: Ceph has a following race between hole punching and page fault: CPU1 CPU2 ceph_fallocate() ... ceph_zero_pagecache_range() ceph_filemap_fault() faults in page in the range being punched ceph_zero_objects() And now we have a page in punched range with invalid data. Fix the problem by using mapping->invalidate_lock similarly to other filesystems. Note that using invalidate_lock also fixes a similar race wrt ->readpage(). CC: Jeff Layton CC: ceph-devel@vger.kernel.org Reviewed-by: Jeff Layton Signed-off-by: Jan Kara --- fs/ceph/addr.c | 9 ++++++--- fs/ceph/file.c | 2 ++ 2 files changed, 8 insertions(+), 3 deletions(-) diff --git a/fs/ceph/addr.c b/fs/ceph/addr.c index a1e2813731d1..7e7a897ae0d3 100644 --- a/fs/ceph/addr.c +++ b/fs/ceph/addr.c @@ -1395,9 +1395,11 @@ static vm_fault_t ceph_filemap_fault(struct vm_fault *vmf) ret = VM_FAULT_SIGBUS; } else { struct address_space *mapping = inode->i_mapping; - struct page *page = find_or_create_page(mapping, 0, - mapping_gfp_constraint(mapping, - ~__GFP_FS)); + struct page *page; + + filemap_invalidate_lock_shared(mapping); + page = find_or_create_page(mapping, 0, + mapping_gfp_constraint(mapping, ~__GFP_FS)); if (!page) { ret = VM_FAULT_OOM; goto out_inline; @@ -1418,6 +1420,7 @@ static vm_fault_t ceph_filemap_fault(struct vm_fault *vmf) vmf->page = page; ret = VM_FAULT_MAJOR | VM_FAULT_LOCKED; out_inline: + filemap_invalidate_unlock_shared(mapping); dout("filemap_fault %p %llu read inline data ret %x\n", inode, off, ret); } diff --git a/fs/ceph/file.c b/fs/ceph/file.c index d1755ac1d964..e1d605a02d4a 100644 --- a/fs/ceph/file.c +++ b/fs/ceph/file.c @@ -2088,6 +2088,7 @@ static long ceph_fallocate(struct file *file, int mode, if (ret < 0) goto unlock; + filemap_invalidate_lock(inode->i_mapping); ceph_zero_pagecache_range(inode, offset, length); ret = ceph_zero_objects(inode, offset, length); @@ -2100,6 +2101,7 @@ static long ceph_fallocate(struct file *file, int mode, if (dirty) __mark_inode_dirty(inode, dirty); } + filemap_invalidate_unlock(inode->i_mapping); ceph_put_cap_refs(ci, got); unlock: