xfs: asserting lock not held during freeing not valid
When we free an inode, we do so via RCU. As an RCU lookup can occur at any time before we free an inode, and that lookup takes the inode flags lock, we cannot safely assert that the flags lock is not held just before marking it dead and running call_rcu() to free the inode. We check on allocation of a new inode structre that the lock is not held, so we still have protection against locks being leaked and hence not correctly initialised when allocated out of the slab. Hence just remove the assert... Signed-off-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Mark Tinguely <tinguely@sgi.com> Signed-off-by: Ben Myers <bpm@sgi.com>
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@ -119,11 +119,6 @@ xfs_inode_free(
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ip->i_itemp = NULL;
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}
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/* asserts to verify all state is correct here */
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ASSERT(atomic_read(&ip->i_pincount) == 0);
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ASSERT(!spin_is_locked(&ip->i_flags_lock));
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ASSERT(!xfs_isiflocked(ip));
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/*
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* Because we use RCU freeing we need to ensure the inode always
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* appears to be reclaimed with an invalid inode number when in the
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@ -135,6 +130,10 @@ xfs_inode_free(
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ip->i_ino = 0;
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spin_unlock(&ip->i_flags_lock);
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/* asserts to verify all state is correct here */
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ASSERT(atomic_read(&ip->i_pincount) == 0);
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ASSERT(!xfs_isiflocked(ip));
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call_rcu(&VFS_I(ip)->i_rcu, xfs_inode_free_callback);
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}
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