[PATCH v4 15/16] gfs2: add pre-content fsnotify hook to fault

[Josef Bacik]

gfs2 takes the glock before calling into filemap fault, so add the
fsnotify hook for ->fault before we take the glock in order to avoid any
possible deadlock with the HSM.

Signed-off-by: Josef Bacik <jo...@toxicpanda.com>
---
 fs/gfs2/file.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/fs/gfs2/file.c b/fs/gfs2/file.c
index 08982937b5df..d4af70d765e0 100644
--- a/fs/gfs2/file.c
+++ b/fs/gfs2/file.c
@@ -556,6 +556,10 @@ static vm_fault_t gfs2_fault(struct vm_fault *vmf)
        vm_fault_t ret;
        int err;
 
+       ret = filemap_maybe_emit_fsnotify_event(vmf);
+       if (unlikely(ret))
+               return ret;
+
        gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
        err = gfs2_glock_nq(&gh);
        if (err) {
-- 
2.43.0