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Date: Thu, 15 Jul 2021 15:40:19 +0200
From: Jan Kara <jack@...e.cz>
To: <linux-fsdevel@...r.kernel.org>
Cc: <linux-ext4@...r.kernel.org>,
Christoph Hellwig <hch@...radead.org>,
"Darrick J. Wong" <djwong@...nel.org>, Ted Tso <tytso@....edu>,
Dave Chinner <david@...morbit.com>,
Matthew Wilcox <willy@...radead.org>, <linux-mm@...ck.org>,
<linux-xfs@...r.kernel.org>,
linux-f2fs-devel@...ts.sourceforge.net, linux-cifs@...r.kernel.org,
ceph-devel@...r.kernel.org, Jan Kara <jack@...e.cz>,
Christoph Hellwig <hch@....de>
Subject: [PATCH 09/14] xfs: Convert double locking of MMAPLOCK to use VFS helpers
Convert places in XFS that take MMAPLOCK for two inodes to use helper
VFS provides for it (filemap_invalidate_down_write_two()). Note that
this changes lock ordering for MMAPLOCK from inode number based ordering
to pointer based ordering VFS generally uses.
CC: "Darrick J. Wong" <djwong@...nel.org>
Reviewed-by: Darrick J. Wong <djwong@...nel.org>
Reviewed-by: Christoph Hellwig <hch@....de>
Signed-off-by: Jan Kara <jack@...e.cz>
---
fs/xfs/xfs_bmap_util.c | 15 ++++++++-------
fs/xfs/xfs_inode.c | 37 +++++++++++--------------------------
2 files changed, 19 insertions(+), 33 deletions(-)
diff --git a/fs/xfs/xfs_bmap_util.c b/fs/xfs/xfs_bmap_util.c
index 213a97a921bb..1cd3f940fa6a 100644
--- a/fs/xfs/xfs_bmap_util.c
+++ b/fs/xfs/xfs_bmap_util.c
@@ -1626,7 +1626,6 @@ xfs_swap_extents(
struct xfs_bstat *sbp = &sxp->sx_stat;
int src_log_flags, target_log_flags;
int error = 0;
- int lock_flags;
uint64_t f;
int resblks = 0;
unsigned int flags = 0;
@@ -1638,8 +1637,8 @@ xfs_swap_extents(
* do the rest of the checks.
*/
lock_two_nondirectories(VFS_I(ip), VFS_I(tip));
- lock_flags = XFS_MMAPLOCK_EXCL;
- xfs_lock_two_inodes(ip, XFS_MMAPLOCK_EXCL, tip, XFS_MMAPLOCK_EXCL);
+ filemap_invalidate_lock_two(VFS_I(ip)->i_mapping,
+ VFS_I(tip)->i_mapping);
/* Verify that both files have the same format */
if ((VFS_I(ip)->i_mode & S_IFMT) != (VFS_I(tip)->i_mode & S_IFMT)) {
@@ -1711,7 +1710,6 @@ xfs_swap_extents(
* or cancel will unlock the inodes from this point onwards.
*/
xfs_lock_two_inodes(ip, XFS_ILOCK_EXCL, tip, XFS_ILOCK_EXCL);
- lock_flags |= XFS_ILOCK_EXCL;
xfs_trans_ijoin(tp, ip, 0);
xfs_trans_ijoin(tp, tip, 0);
@@ -1830,13 +1828,16 @@ xfs_swap_extents(
trace_xfs_swap_extent_after(ip, 0);
trace_xfs_swap_extent_after(tip, 1);
+out_unlock_ilock:
+ xfs_iunlock(ip, XFS_ILOCK_EXCL);
+ xfs_iunlock(tip, XFS_ILOCK_EXCL);
out_unlock:
- xfs_iunlock(ip, lock_flags);
- xfs_iunlock(tip, lock_flags);
+ filemap_invalidate_unlock_two(VFS_I(ip)->i_mapping,
+ VFS_I(tip)->i_mapping);
unlock_two_nondirectories(VFS_I(ip), VFS_I(tip));
return error;
out_trans_cancel:
xfs_trans_cancel(tp);
- goto out_unlock;
+ goto out_unlock_ilock;
}
diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c
index d6a8ac76b45d..3c0bb21453dc 100644
--- a/fs/xfs/xfs_inode.c
+++ b/fs/xfs/xfs_inode.c
@@ -552,12 +552,10 @@ xfs_lock_inodes(
}
/*
- * xfs_lock_two_inodes() can only be used to lock one type of lock at a time -
- * the mmaplock or the ilock, but not more than one type at a time. If we lock
- * more than one at a time, lockdep will report false positives saying we have
- * violated locking orders. The iolock must be double-locked separately since
- * we use i_rwsem for that. We now support taking one lock EXCL and the other
- * SHARED.
+ * xfs_lock_two_inodes() can only be used to lock ilock. The iolock and
+ * mmaplock must be double-locked separately since we use i_rwsem and
+ * invalidate_lock for that. We now support taking one lock EXCL and the
+ * other SHARED.
*/
void
xfs_lock_two_inodes(
@@ -575,15 +573,8 @@ xfs_lock_two_inodes(
ASSERT(hweight32(ip1_mode) == 1);
ASSERT(!(ip0_mode & (XFS_IOLOCK_SHARED|XFS_IOLOCK_EXCL)));
ASSERT(!(ip1_mode & (XFS_IOLOCK_SHARED|XFS_IOLOCK_EXCL)));
- ASSERT(!(ip0_mode & (XFS_MMAPLOCK_SHARED|XFS_MMAPLOCK_EXCL)) ||
- !(ip0_mode & (XFS_ILOCK_SHARED|XFS_ILOCK_EXCL)));
- ASSERT(!(ip1_mode & (XFS_MMAPLOCK_SHARED|XFS_MMAPLOCK_EXCL)) ||
- !(ip1_mode & (XFS_ILOCK_SHARED|XFS_ILOCK_EXCL)));
- ASSERT(!(ip1_mode & (XFS_MMAPLOCK_SHARED|XFS_MMAPLOCK_EXCL)) ||
- !(ip0_mode & (XFS_ILOCK_SHARED|XFS_ILOCK_EXCL)));
- ASSERT(!(ip0_mode & (XFS_MMAPLOCK_SHARED|XFS_MMAPLOCK_EXCL)) ||
- !(ip1_mode & (XFS_ILOCK_SHARED|XFS_ILOCK_EXCL)));
-
+ ASSERT(!(ip0_mode & (XFS_MMAPLOCK_SHARED|XFS_MMAPLOCK_EXCL)));
+ ASSERT(!(ip1_mode & (XFS_MMAPLOCK_SHARED|XFS_MMAPLOCK_EXCL)));
ASSERT(ip0->i_ino != ip1->i_ino);
if (ip0->i_ino > ip1->i_ino) {
@@ -3748,11 +3739,8 @@ xfs_ilock2_io_mmap(
ret = xfs_iolock_two_inodes_and_break_layout(VFS_I(ip1), VFS_I(ip2));
if (ret)
return ret;
- if (ip1 == ip2)
- xfs_ilock(ip1, XFS_MMAPLOCK_EXCL);
- else
- xfs_lock_two_inodes(ip1, XFS_MMAPLOCK_EXCL,
- ip2, XFS_MMAPLOCK_EXCL);
+ filemap_invalidate_lock_two(VFS_I(ip1)->i_mapping,
+ VFS_I(ip2)->i_mapping);
return 0;
}
@@ -3762,12 +3750,9 @@ xfs_iunlock2_io_mmap(
struct xfs_inode *ip1,
struct xfs_inode *ip2)
{
- bool same_inode = (ip1 == ip2);
-
- xfs_iunlock(ip2, XFS_MMAPLOCK_EXCL);
- if (!same_inode)
- xfs_iunlock(ip1, XFS_MMAPLOCK_EXCL);
+ filemap_invalidate_unlock_two(VFS_I(ip1)->i_mapping,
+ VFS_I(ip2)->i_mapping);
inode_unlock(VFS_I(ip2));
- if (!same_inode)
+ if (ip1 != ip2)
inode_unlock(VFS_I(ip1));
}
--
2.26.2
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