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afs: Add some callback management tracepoints

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Add a couple of tracepoints to track callback management:

 (1) afs_cb_miss - Logs when we were unable to apply a callback, either due
     to the inode being discarded or due to a competing thread applying a
     callback first.

 (2) afs_cb_break - Logs when we attempted to clear the noted callback
     promise, either due to the server explicitly breaking the callback,
     the callback promise lapsing or a local event obsoleting it.

Signed-off-by: David Howells <dhowells@redhat.com>
This commit is contained in:
David Howells
2019-06-20 18:12:16 +01:00
parent fa59f52f5b
commit 051d25250b
5 changed files with 97 additions and 17 deletions
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4
fs/afs/dir.c
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@@ -1367,12 +1367,12 @@ static int afs_dir_remove_link(struct afs_vnode *dvnode, struct dentry *dentry,
drop_nlink(&vnode->vfs_inode);
if (vnode->vfs_inode.i_nlink == 0) {
set_bit(AFS_VNODE_DELETED, &vnode->flags);
__afs_break_callback(vnode);
__afs_break_callback(vnode, afs_cb_break_for_unlink);
}
write_sequnlock(&vnode->cb_lock);
ret = 0;
} else {
afs_break_callback(vnode);
afs_break_callback(vnode, afs_cb_break_for_unlink);
if (test_bit(AFS_VNODE_DELETED, &vnode->flags))
kdebug("AFS_VNODE_DELETED");