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cachefiles: Wait rather than BUG'ing on "Unexpected object collision"

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[ Upstream commit c2412ac45a8f8f1cd582723c1a139608694d410d ]

If we meet a conflicting object that is marked FSCACHE_OBJECT_IS_LIVE in
the active object tree, we have been emitting a BUG after logging
information about it and the new object.

Instead, we should wait for the CACHEFILES_OBJECT_ACTIVE flag to be cleared
on the old object (or return an error).  The ACTIVE flag should be cleared
after it has been removed from the active object tree.  A timeout of 60s is
used in the wait, so we shouldn't be able to get stuck there.

Fixes: 9ae326a69004 ("CacheFiles: A cache that backs onto a mounted filesystem")
Signed-off-by: Kiran Kumar Modukuri <kiran.modukuri@gmail.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Kiran Kumar Modukuri 2018-06-21 13:25:53 -07:00 committed by Greg Kroah-Hartman
parent 4029dd9fc4
commit 2c69b03004
1 changed files with 0 additions and 1 deletions
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fs/cachefiles/namei.c
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@ -195,7 +195,6 @@ wait_for_old_object:
pr_err("\n");
pr_err("Error: Unexpected object collision\n");
cachefiles_printk_object(object, xobject);
BUG();
}
atomic_inc(&xobject->usage);
write_unlock(&cache->active_lock);