From: "Darrick J. Wong" <darrick.wong@oracle.com> To: mfasheh@versity.com, akpm@linux-foundation.org, jlbec@evilplan.org, darrick.wong@oracle.com Cc: linux-fsdevel@vger.kernel.org, hch@infradead.org, ocfs2-devel@oss.oracle.com Subject: [PATCH 05/11] ocfs2: prohibit refcounted swapfiles Date: Sat, 10 Dec 2016 12:43:28 -0800 [thread overview] Message-ID: <148140260839.24628.13516334275350937863.stgit@birch.djwong.org> (raw) In-Reply-To: <148140257493.24628.6724911560073347399.stgit@birch.djwong.org> The swapfile mechanism calls bmap once to find all the swap file mappings, which means that we cannot properly support CoW remapping. Therefore, error out if the swap code tries to call bmap on a refcounted file. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> --- fs/ocfs2/aops.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/fs/ocfs2/aops.c b/fs/ocfs2/aops.c index c5c5b97..4d037db 100644 --- a/fs/ocfs2/aops.c +++ b/fs/ocfs2/aops.c @@ -464,6 +464,15 @@ static sector_t ocfs2_bmap(struct address_space *mapping, sector_t block) trace_ocfs2_bmap((unsigned long long)OCFS2_I(inode)->ip_blkno, (unsigned long long)block); + /* + * The swap code (ab-)uses ->bmap to get a block mapping and then + * bypasseѕ the file system for actual I/O. We really can't allow + * that on refcounted inodes, so we have to skip out here. And yes, + * 0 is the magic code for a bmap error.. + */ + if (ocfs2_is_refcount_inode(inode)) + return 0; + /* We don't need to lock journal system files, since they aren't * accessed concurrently from multiple nodes. */
WARNING: multiple messages have this Message-ID (diff)
From: Darrick J. Wong <darrick.wong@oracle.com> To: mfasheh@versity.com, akpm@linux-foundation.org, jlbec@evilplan.org, darrick.wong@oracle.com Cc: linux-fsdevel@vger.kernel.org, hch@infradead.org, ocfs2-devel@oss.oracle.com Subject: [Ocfs2-devel] [PATCH 05/11] ocfs2: prohibit refcounted swapfiles Date: Sat, 10 Dec 2016 12:43:28 -0800 [thread overview] Message-ID: <148140260839.24628.13516334275350937863.stgit@birch.djwong.org> (raw) In-Reply-To: <148140257493.24628.6724911560073347399.stgit@birch.djwong.org> The swapfile mechanism calls bmap once to find all the swap file mappings, which means that we cannot properly support CoW remapping. Therefore, error out if the swap code tries to call bmap on a refcounted file. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> --- fs/ocfs2/aops.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/fs/ocfs2/aops.c b/fs/ocfs2/aops.c index c5c5b97..4d037db 100644 --- a/fs/ocfs2/aops.c +++ b/fs/ocfs2/aops.c @@ -464,6 +464,15 @@ static sector_t ocfs2_bmap(struct address_space *mapping, sector_t block) trace_ocfs2_bmap((unsigned long long)OCFS2_I(inode)->ip_blkno, (unsigned long long)block); + /* + * The swap code (ab-)uses ->bmap to get a block mapping and then + * bypasse? the file system for actual I/O. We really can't allow + * that on refcounted inodes, so we have to skip out here. And yes, + * 0 is the magic code for a bmap error.. + */ + if (ocfs2_is_refcount_inode(inode)) + return 0; + /* We don't need to lock journal system files, since they aren't * accessed concurrently from multiple nodes. */
next prev parent reply other threads:[~2016-12-10 20:44 UTC|newest] Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top 2016-12-10 20:42 [PATCH v4 00/11] ocfs2: wire up {clone,copy,dedupe}_range Darrick J. Wong 2016-12-10 20:42 ` [Ocfs2-devel] [PATCH v4 00/11] ocfs2: wire up {clone, copy, dedupe}_range Darrick J. Wong 2016-12-10 20:43 ` [PATCH 01/11] fs: try to clone files first in vfs_copy_file_range Christoph Hellwig 2016-12-10 20:43 ` [Ocfs2-devel] " Christoph Hellwig 2016-12-10 20:43 ` [PATCH 02/11] vfs: refactor clone/dedupe_file_range common functions Darrick J. Wong 2016-12-10 20:43 ` [Ocfs2-devel] " Darrick J. Wong 2016-12-10 20:43 ` [PATCH 03/11] ocfs2: convert inode refcount test to a helper Darrick J. Wong 2016-12-10 20:43 ` [Ocfs2-devel] " Darrick J. Wong 2016-12-10 20:43 ` [PATCH 04/11] ocfs2: add newlines to some error messages Darrick J. Wong 2016-12-10 20:43 ` [Ocfs2-devel] " Darrick J. Wong 2016-12-10 20:43 ` Darrick J. Wong [this message] 2016-12-10 20:43 ` [Ocfs2-devel] [PATCH 05/11] ocfs2: prohibit refcounted swapfiles Darrick J. Wong 2016-12-10 20:43 ` [PATCH 06/11] ocfs2: budget for extent tree splits when adding refcount flag Darrick J. Wong 2016-12-10 20:43 ` [Ocfs2-devel] " Darrick J. Wong 2016-12-10 20:43 ` [PATCH 07/11] ocfs2: don't eat io errors during _dio_end_io_write Darrick J. Wong 2016-12-10 20:43 ` [Ocfs2-devel] " Darrick J. Wong 2016-12-10 20:43 ` [PATCH 08/11] ocfs2: always unlock when completing dio writes Darrick J. Wong 2016-12-10 20:43 ` [Ocfs2-devel] " Darrick J. Wong 2016-12-10 20:43 ` [PATCH 09/11] ocfs2: fix bad pointer cast Darrick J. Wong 2016-12-10 20:43 ` [Ocfs2-devel] " Darrick J. Wong 2016-12-10 20:44 ` [PATCH 10/11] ocfs2: charge quota for reflinked blocks Darrick J. Wong 2016-12-10 20:44 ` [Ocfs2-devel] " Darrick J. Wong 2016-12-10 20:44 ` [PATCH 11/11] ocfs2: implement the VFS clone_range, copy_range, and dedupe_range features Darrick J. Wong 2016-12-10 20:44 ` [Ocfs2-devel] " Darrick J. Wong 2016-12-10 23:43 ` [PATCH v4 00/11] ocfs2: wire up {clone,copy,dedupe}_range Al Viro 2016-12-10 23:43 ` [Ocfs2-devel] [PATCH v4 00/11] ocfs2: wire up {clone, copy, dedupe}_range Al Viro 2016-12-10 23:46 ` [PATCH v4 00/11] ocfs2: wire up {clone,copy,dedupe}_range Al Viro 2016-12-10 23:46 ` [Ocfs2-devel] [PATCH v4 00/11] ocfs2: wire up {clone, copy, dedupe}_range Al Viro 2016-12-11 22:03 ` [PATCH v4 00/11] ocfs2: wire up {clone,copy,dedupe}_range Darrick J. Wong 2016-12-11 22:03 ` [Ocfs2-devel] [PATCH v4 00/11] ocfs2: wire up {clone, copy, dedupe}_range Darrick J. Wong
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