[PATCH v2 16/16] xfs: add pre-content fsnotify hook for write faults

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xfs has it's own handling for write faults, so we need to add the
pre-content fsnotify hook for this case.  Reads go through filemap_fault
so they're handled properly there.

Signed-off-by: Josef Bacik <josef@xxxxxxxxxxxxxx>
---
 fs/xfs/xfs_file.c | 20 +++++++++++++++++---
 1 file changed, 17 insertions(+), 3 deletions(-)

diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c
index 4cdc54dc9686..585a8c2eea0f 100644
--- a/fs/xfs/xfs_file.c
+++ b/fs/xfs/xfs_file.c
@@ -1325,14 +1325,28 @@ __xfs_filemap_fault(
 	bool			write_fault)
 {
 	struct inode		*inode = file_inode(vmf->vma->vm_file);
+	struct file		*fpin = NULL;
+	vm_fault_t		ret;
 
 	trace_xfs_filemap_fault(XFS_I(inode), order, write_fault);
 
-	if (write_fault)
-		return xfs_write_fault(vmf, order);
 	if (IS_DAX(inode))
 		return xfs_dax_read_fault(vmf, order);
-	return filemap_fault(vmf);
+
+	if (!write_fault)
+		return filemap_fault(vmf);
+
+	ret = filemap_maybe_emit_fsnotify_event(vmf, &fpin);
+	if (unlikely(ret)) {
+		if (fpin)
+			fput(fpin);
+		return ret;
+	} else if (fpin) {
+		fput(fpin);
+		return VM_FAULT_RETRY;
+	}
+
+	return xfs_write_fault(vmf, order);
 }
 
 static inline bool
-- 
2.43.0





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