From: Jan Kara <jack@suse.cz> To: <linux-fsdevel@vger.kernel.org> Cc: <linux-ext4@vger.kernel.org>, Christoph Hellwig <hch@infradead.org>, "Darrick J. Wong" <djwong@kernel.org>, Ted Tso <tytso@mit.edu>, Dave Chinner <david@fromorbit.com>, Matthew Wilcox <willy@infradead.org>, <linux-mm@kvack.org>, <linux-xfs@vger.kernel.org>, linux-f2fs-devel@lists.sourceforge.net, linux-cifs@vger.kernel.org, ceph-devel@vger.kernel.org, Jan Kara <jack@suse.cz>, Jeff Layton <jlayton@kernel.org> Subject: [PATCH 13/14] ceph: Fix race between hole punch and page fault Date: Thu, 15 Jul 2021 15:40:23 +0200 [thread overview] Message-ID: <20210715134032.24868-13-jack@suse.cz> (raw) In-Reply-To: <20210715133202.5975-1-jack@suse.cz> 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 <jlayton@kernel.org> CC: ceph-devel@vger.kernel.org Reviewed-by: Jeff Layton <jlayton@kernel.org> Signed-off-by: Jan Kara <jack@suse.cz> --- 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: -- 2.26.2
WARNING: multiple messages have this Message-ID (diff)
From: Jan Kara <jack@suse.cz> To: <linux-fsdevel@vger.kernel.org> Cc: Jeff Layton <jlayton@kernel.org>, linux-xfs@vger.kernel.org, Ted Tso <tytso@mit.edu>, linux-cifs@vger.kernel.org, "Darrick J. Wong" <djwong@kernel.org>, Dave Chinner <david@fromorbit.com>, Matthew Wilcox <willy@infradead.org>, linux-f2fs-devel@lists.sourceforge.net, Christoph Hellwig <hch@infradead.org>, linux-mm@kvack.org, Jan Kara <jack@suse.cz>, ceph-devel@vger.kernel.org, linux-ext4@vger.kernel.org Subject: [f2fs-dev] [PATCH 13/14] ceph: Fix race between hole punch and page fault Date: Thu, 15 Jul 2021 15:40:23 +0200 [thread overview] Message-ID: <20210715134032.24868-13-jack@suse.cz> (raw) In-Reply-To: <20210715133202.5975-1-jack@suse.cz> 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 <jlayton@kernel.org> CC: ceph-devel@vger.kernel.org Reviewed-by: Jeff Layton <jlayton@kernel.org> Signed-off-by: Jan Kara <jack@suse.cz> --- 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: -- 2.26.2 _______________________________________________ Linux-f2fs-devel mailing list Linux-f2fs-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel
next prev parent reply other threads:[~2021-07-15 13:41 UTC|newest] Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-07-15 13:40 [PATCH 0/14 v10] fs: Hole punch vs page cache filling races Jan Kara 2021-07-15 13:40 ` [f2fs-dev] " Jan Kara 2021-07-15 13:40 ` [PATCH 01/14] mm: Fix comments mentioning i_mutex Jan Kara 2021-07-15 13:40 ` [f2fs-dev] " Jan Kara 2021-07-15 13:40 ` [PATCH 02/14] documentation: Sync file_operations members with reality Jan Kara 2021-07-15 13:40 ` [f2fs-dev] " Jan Kara 2021-07-15 13:40 ` [PATCH 03/14] mm: Protect operations adding pages to page cache with invalidate_lock Jan Kara 2021-07-15 13:40 ` [f2fs-dev] " Jan Kara 2021-07-15 13:40 ` [PATCH 04/14] mm: Add functions to lock invalidate_lock for two mappings Jan Kara 2021-07-15 13:40 ` [f2fs-dev] " Jan Kara 2021-07-15 13:40 ` [PATCH 05/14] ext4: Convert to use mapping->invalidate_lock Jan Kara 2021-07-15 13:40 ` [f2fs-dev] " Jan Kara 2021-07-15 13:40 ` [PATCH 06/14] ext2: Convert to using invalidate_lock Jan Kara 2021-07-15 13:40 ` [f2fs-dev] " Jan Kara 2021-07-15 13:40 ` [PATCH 07/14] xfs: Refactor xfs_isilocked() Jan Kara 2021-07-15 13:40 ` [f2fs-dev] " Jan Kara 2021-07-15 13:40 ` [PATCH 08/14] xfs: Convert to use invalidate_lock Jan Kara 2021-07-15 13:40 ` [f2fs-dev] " Jan Kara 2021-07-15 13:40 ` [PATCH 09/14] xfs: Convert double locking of MMAPLOCK to use VFS helpers Jan Kara 2021-07-15 13:40 ` [f2fs-dev] " Jan Kara 2021-07-15 13:40 ` [PATCH 10/14] zonefs: Convert to using invalidate_lock Jan Kara 2021-07-15 13:40 ` [f2fs-dev] " Jan Kara 2021-07-15 13:40 ` [PATCH 11/14] f2fs: " Jan Kara 2021-07-15 13:40 ` [f2fs-dev] " Jan Kara 2021-07-15 13:40 ` [PATCH 12/14] fuse: " Jan Kara 2021-07-15 13:40 ` [f2fs-dev] " Jan Kara 2021-07-15 13:40 ` Jan Kara [this message] 2021-07-15 13:40 ` [f2fs-dev] [PATCH 13/14] ceph: Fix race between hole punch and page fault Jan Kara 2021-07-15 13:40 ` [PATCH 14/14] cifs: " Jan Kara 2021-07-15 13:40 ` [f2fs-dev] " Jan Kara 2021-07-16 6:02 ` [PATCH 0/14 v10] fs: Hole punch vs page cache filling races Christoph Hellwig 2021-07-16 6:02 ` [f2fs-dev] " Christoph Hellwig 2021-07-16 16:43 ` Darrick J. Wong 2021-07-16 16:43 ` [f2fs-dev] " Darrick J. Wong 2021-07-16 16:57 ` Jan Kara 2021-07-16 16:57 ` [f2fs-dev] " Jan Kara -- strict thread matches above, loose matches on Subject: below -- 2021-07-12 16:55 [PATCH 0/14 v9] " Jan Kara 2021-07-12 16:56 ` [PATCH 13/14] ceph: Fix race between hole punch and page fault Jan Kara 2021-06-15 9:17 [PATCH 0/14 v8] fs: Hole punch vs page cache filling races Jan Kara 2021-06-15 9:18 ` [PATCH 13/14] ceph: Fix race between hole punch and page fault Jan Kara 2021-06-07 14:52 [PATCH 0/14 v7] fs: Hole punch vs page cache filling races Jan Kara 2021-06-07 14:52 ` [PATCH 13/14] ceph: Fix race between hole punch and page fault Jan Kara
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