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Diffstat (limited to 'fs/xfs/xfs_inode.c')
-rw-r--r--fs/xfs/xfs_inode.c69
1 files changed, 65 insertions, 4 deletions
diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c
index 3022918bf96a..28493c8e9bb2 100644
--- a/fs/xfs/xfs_inode.c
+++ b/fs/xfs/xfs_inode.c
@@ -3447,6 +3447,50 @@ retry:
return 0;
}
+static int
+xfs_mmaplock_two_inodes_and_break_dax_layout(
+ struct xfs_inode *ip1,
+ struct xfs_inode *ip2)
+{
+ int error;
+ bool retry;
+ struct page *page;
+
+ if (ip1->i_ino > ip2->i_ino)
+ swap(ip1, ip2);
+
+again:
+ retry = false;
+ /* Lock the first inode */
+ xfs_ilock(ip1, XFS_MMAPLOCK_EXCL);
+ error = xfs_break_dax_layouts(VFS_I(ip1), &retry);
+ if (error || retry) {
+ xfs_iunlock(ip1, XFS_MMAPLOCK_EXCL);
+ if (error == 0 && retry)
+ goto again;
+ return error;
+ }
+
+ if (ip1 == ip2)
+ return 0;
+
+ /* Nested lock the second inode */
+ xfs_ilock(ip2, xfs_lock_inumorder(XFS_MMAPLOCK_EXCL, 1));
+ /*
+ * We cannot use xfs_break_dax_layouts() directly here because it may
+ * need to unlock & lock the XFS_MMAPLOCK_EXCL which is not suitable
+ * for this nested lock case.
+ */
+ page = dax_layout_busy_page(VFS_I(ip2)->i_mapping);
+ if (page && page_ref_count(page) != 1) {
+ xfs_iunlock(ip2, XFS_MMAPLOCK_EXCL);
+ xfs_iunlock(ip1, XFS_MMAPLOCK_EXCL);
+ goto again;
+ }
+
+ return 0;
+}
+
/*
* Lock two inodes so that userspace cannot initiate I/O via file syscalls or
* mmap activity.
@@ -3461,8 +3505,19 @@ xfs_ilock2_io_mmap(
ret = xfs_iolock_two_inodes_and_break_layout(VFS_I(ip1), VFS_I(ip2));
if (ret)
return ret;
- filemap_invalidate_lock_two(VFS_I(ip1)->i_mapping,
- VFS_I(ip2)->i_mapping);
+
+ if (IS_DAX(VFS_I(ip1)) && IS_DAX(VFS_I(ip2))) {
+ ret = xfs_mmaplock_two_inodes_and_break_dax_layout(ip1, ip2);
+ if (ret) {
+ inode_unlock(VFS_I(ip2));
+ if (ip1 != ip2)
+ inode_unlock(VFS_I(ip1));
+ return ret;
+ }
+ } else
+ filemap_invalidate_lock_two(VFS_I(ip1)->i_mapping,
+ VFS_I(ip2)->i_mapping);
+
return 0;
}
@@ -3472,8 +3527,14 @@ xfs_iunlock2_io_mmap(
struct xfs_inode *ip1,
struct xfs_inode *ip2)
{
- filemap_invalidate_unlock_two(VFS_I(ip1)->i_mapping,
- VFS_I(ip2)->i_mapping);
+ if (IS_DAX(VFS_I(ip1)) && IS_DAX(VFS_I(ip2))) {
+ xfs_iunlock(ip2, XFS_MMAPLOCK_EXCL);
+ if (ip1 != ip2)
+ xfs_iunlock(ip1, XFS_MMAPLOCK_EXCL);
+ } else
+ filemap_invalidate_unlock_two(VFS_I(ip1)->i_mapping,
+ VFS_I(ip2)->i_mapping);
+
inode_unlock(VFS_I(ip2));
if (ip1 != ip2)
inode_unlock(VFS_I(ip1));